Sample records for monofilament absorbable suture

  1. Postoperative complications with protruding monofilament nylon sutures.

    PubMed

    Shahinian, L; Brown, S I

    1977-04-01

    Cut ends of 10-0 monofilament nylon sutures protruded and caused various combinations of severe pain, conjunctival inflammation, tarsal conjunctival ulcerations, eyelid edema, and corneal epithelial erosions in six patients postoperatively. These changes occurred one to three weeks after keratoplasty and one to three months after cataract surgery. In all six patients the signs and symptoms cleared after we trimmed or removed the offending sutures. PMID:326051

  2. Prolene monofilament suture in Boston Keratoprosthesis surgery

    PubMed Central

    Kyrillos,, Ralph; Harissi-Dagher, Mona

    2011-01-01

    Summary Toxic reaction to nylon following uncomplicated cataract surgery and vitrectomy has been documented in the literature. We report the case of an aniridic patient with a known adverse reaction to nylon in whom Prolene suture was used in Boston Keratoprosthesis type 1 (KPro) surgery. During follow-up the cornea was checked for signs of inflammation and toxic reaction; at last follow-up (18 months) the patient showed no signs of complications due to Prolene. Our study suggests that Prolene suture may be used as an alternative to nylon in Boston KPro surgery in patients with a history of nylon toxicity. PMID:23362386

  3. A Pilot Study Comparing Anatomic Failure after Sacrocolpopexy with Absorbable or Permanent Sutures for Vaginal Mesh Attachment

    PubMed Central

    Tan-Kim, Jasmine; Menefee, Shawn A; Lippmann, Quinn; Lukacz, Emily S; Luber, Karl M; Nager, Charles W

    2014-01-01

    Objectives: To describe anatomic failure rates for sacrocolpopexy in groups receiving either delayed absorbable or permanent monofilament suture for mesh attachment to the vagina. Methods: We reviewed the medical records of 193 women who underwent sacrocolpopexy with 2 different types of sutures attaching polypropylene mesh to the vagina: delayed absorbable sutures (median follow-up, 43 weeks) and permanent sutures (median follow-up, 106 weeks). Vaginal apical failure was defined as Point C greater than or equal to half of the total vaginal length. Anterior-posterior compartmental failures were defined as Point Ba and/or Point Bp more than 0 cm. Fisher exact and ?2 tests were used to compare failure rates. There were no documented suture erosions in the delayed absorbable monofilament suture group during the review period. Two patients in the permanent suture group were found to have permanent suture in the bladder more than 30 weeks after the index procedure. Results: Failure rates for the 45 subjects in the delayed absorbable group and 148 subjects in the permanent suture group were similar (4.4% vs 3.4%, p = 0.74) and not statistically different in any compartment: apical (0% vs 1.4%, p = 0.43), anterior (4.4% vs 2%, p = 0.38), or posterior (0% vs 1.4%, p = 0.43). Conclusions: Delayed absorbable monofilament suture appears to be a reasonable alternative to permanent suture for mesh attachment to the vagina during sacrocolpopexy. The use of delayed absorbable suture could potentially prevent complications of suture erosion into the bladder or vagina remote from the time of surgery. PMID:25662525

  4. Interrupted or continuous slowly absorbable sutures – Design of a multi-centre randomised trial to evaluate abdominal closure techniques INSECT-Trial [ISRCTN24023541

    PubMed Central

    Knaebel, Hanns-Peter; Koch, Moritz; Sauerland, Stefan; Diener, Markus K; Büchler, Markus W; Seiler, Christoph M

    2005-01-01

    Background The closure of the abdomen after median laparotomy is still a matter of debate among surgeons. Further well designed and performed randomised controlled trials determining the optimal method of abdominal fascial closure are needed. Design This is a three armed, multi-centre, intra-operatively randomised, controlled, patient blinded trial. Over 20 surgical departments will enrol 600 patients who are planned for an elective primary abdominal operation. The objective of this study is to compare the frequency of abdominal incisional hernias between two continuous suture techniques with different, slowly absorbable monofilament materials and an interrupted suture using an absorbable braided suture material at one year postoperatively. Conclusion This trial will answer the question whether the continuous abdominal wall closure with a slowly absorbable material with longitudinal elasticity is superior to the continuous suture with a material lacking elasticity and to interrupted sutures with braided thread. PMID:15755324

  5. Urolithiasis on absorbable and non-absorbable suture materials in the rabbit bladder.

    PubMed

    Morris, M C; Baquero, A; Redovan, E; Mahoney, E; Bannett, A D

    1986-03-01

    Absorbable and non-absorbable suture materials were evaluated for calculi formation and tissue reactivity in the rabbit bladder. Five-O chromic, polydioxinone and polypropylene sutures were used to close cystostomies made in New Zealand white rabbits. Bladders were evaluated at 15, 30, 60 and 90 days. Calculi formed on all sutures tested and the persistence of calculi appeared to be dependent on the longevity of the suture material used. This data suggests that the use of non-absorbable suture material in urologic surgery may contribute to calculus formation. PMID:3080609

  6. 21 CFR 878.4830 - Absorbable surgical gut suture.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GENERAL AND PLASTIC SURGERY DEVICES Surgical Devices § 878.4830 Absorbable surgical gut suture. (a) Identification....

  7. 21 CFR 878.4830 - Absorbable surgical gut suture.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ... FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GENERAL AND PLASTIC SURGERY DEVICES Surgical Devices § 878.4830 Absorbable surgical gut suture. (a) Identification. An...

  8. 21 CFR 878.4830 - Absorbable surgical gut suture.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ... FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GENERAL AND PLASTIC SURGERY DEVICES Surgical Devices § 878.4830 Absorbable surgical gut suture. (a) Identification. An...

  9. 21 CFR 878.4830 - Absorbable surgical gut suture.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ... FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GENERAL AND PLASTIC SURGERY DEVICES Surgical Devices § 878.4830 Absorbable surgical gut suture. (a) Identification. An...

  10. 21 CFR 878.4830 - Absorbable surgical gut suture.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ... FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GENERAL AND PLASTIC SURGERY DEVICES Surgical Devices § 878.4830 Absorbable surgical gut suture. (a) Identification. An...

  11. Assessment of Pain and Quality of Life in Lichtenstein Hernia Repair Using a New Monofilament PTFE Mesh: Comparison of Suture vs. Fibrin-Sealant Mesh Fixation

    PubMed Central

    Fortelny, René H.; Petter-Puchner, Alexander H.; Redl, Heinz; May, Christopher; Pospischil, Wolfgang; Glaser, Karl

    2014-01-01

    Background: Inguinal hernia repair is one of the most common operations in general surgery. The Lichtenstein tension-free operation has become the gold standard in open inguinal hernia repair. Despite the low recurrence rates, pain and discomfort remain a problem for a large number of patients. The aim of this study was to compare suture fixation vs. fibrin sealing by using a new monofilament PTFE mesh, i.e., the Infinit® mesh by W. L. Gore & Associates. Methods: This study was designed as a controlled prospective single-center two-cohort study. A total of 38 patients were enrolled and operated in Lichtenstein technique either standard suture mesh fixation or fibrin-sealant mesh fixation were used as described in the TIMELI trial. Primary outcome parameters were postoperative complications with the new mesh (i.e., seroma, infection), pain, and quality of life evaluated by the VAS and the SF-36 questionnaire. Secondary outcome was recurrence assessed by ultrasound and physical examination. Follow-up time was 1?year. Results: Significantly, less postoperative pain was reported in the fibrin-sealant group compared to the suture group at 6?weeks (P?=?0.035), 6?months (P?=?0.023), and 1 year (P?=?0.011) postoperatively. Additionally, trends toward a higher postoperative quality of life, a faster surgical procedure, and a shorter hospital stay were seen in the fibrin-sealant group. Conclusion: Fibrin-sealant mesh fixation in Lichtenstein hernioplasty effectively reduces acute and chronic postoperative pain. Monofilament, macro-porous, knitted PTFE meshes seem to be a practicable alternative to commonly used polypropylene meshes in open inguinal hernia repair. PMID:25593969

  12. Gliding Resistance and Strength of a Braided Polyester/Monofilament Polyethylene Composite (FiberWire®) Suture in Human Flexor Digitorum Profundus Tendon Repair: An In-Vitro Biomechanical Study

    PubMed Central

    Silva, Jose M.; Zhao, Chunfeng; An, Kai-Nan; Zobitz, Mark E.; Amadio, Peter C.

    2009-01-01

    Purpose While the strength of a tendon repair is clearly important, the friction of the repair is also a relevant consideration. The purpose of this study was to characterize the frictional coefficient, gliding resistance and breaking strength of suture materials and a suture construct commonly used for flexor tendon repair. Methods We measured the friction coefficients of 3-0 braided nylon enclosed in a smooth nylon outer shell (Supramid, S. Jackson, Alexandria, VA), 3-0 braided polyester coated with polybutilate (Ethibond, Ethicon, Somerville, NJ), and a 3-0 braided polyester/monofilament polyethylene composite (FiberWire, Arthrex, Naples, FL) sutures. We also measured the gliding resistance, linear breaking strength and resistance to gapping of zone 2 modified Pennington tendon repairs with the two lowest friction sutures in 20 human cadaveric flexor digitorum profundus (FDP) tendons. Results The braided polyester/monofilament polyethylene composite had a significantly lower friction coefficient (0.054) than either the coated polyester (0.076) or nylon (0.130) sutures (p<0.001). The gliding resistances of the repaired tendons with braided/monofilament polyethylene composite suture and coated, braided polyester were similar (p> 0.05). The strength of the two repairs, force to produce a 2mm gap, and resistance to gap formation than coated, braided polyester repairs were also not significantly different. Conclusion Braided polyester composite is a low friction suture material. However, when this suture was used for tendon repair with a locking suture technique, it did not show a significant effect on the gliding resistance and repair strength compared with the same repair using coated polyester suture. PMID:19121735

  13. Comparison between absorbable and nonabsorbable sutures in arterial anastomoses in growing dogs.

    PubMed

    Gersak, B

    1991-01-01

    Five dogs, 10 weeks old, underwent operation using ketamin-HCl anesthesia and end-to-end anastomoses of the femoral and brachial arteries were made using polyfilament nonabsorbable material (Ethibond), monofilament nonabsorbable material (Prolene), polyfilament absorbable material (Vicryl) and monofilament absorbable material (PDS). The arterial diameter using a micrometer and blood flow using an electromagnetic flow meter were determined. After six months another operation was performed and diameter and blood flow were measured again. No statistically significant differences were found between the different materials used with respect to growth related increases either in arterial diameter or blood flow. PMID:1836463

  14. Wound closure sutures and needles: a new perspective.

    PubMed

    Edlich, Richard F; Gubler, K; Wallis, Anne G; Clark, Jamie J; Dahlstrom, Jill J; Long, William B

    2010-01-01

    Ideally, the choice of the suture material should be based on the biological interaction of the materials employed, the tissue configuration, and the biomechanical properties of the wound. Measurements of the in vivo degradation of sutures separate them into two general classes: absorbable and nonabsorbable sutures. The nonabsorbable sutures and absorbable sutures are classified according to their origin. When considering an absorbable suture's tensile strength in vivo, we recommend that the manufacturer provides specific recommendations of its holding strength, rather than the percentage retained of its initial tensile strength. The newest advance in nonabsorbable sutures is polybutester suture, which is a block copolymer that contains butylene terephthalate (84%) and polytetramethylene ether glycol terephthalate (16%). The expanded polytetrafluoroethylene (ePTFE) suture has been expanded to produce a porous microstructure that is approximately 50% air by volume. The clinical performance of polybutester suture has been enhanced by coating its surface with a unique absorbable polymer. A search for a synthetic substitute for absorbable collagen sutures led to the development of the POLYSORB™ sutures that can reliably approximate tissues with a low risk for infection. The latest innovation in the development of monofilament absorbable sutures has been in the rapidly absorbing CAPROSYN™ suture. A new high-nickel stainless steel, SURGALLOY™, has been used recently to manufacture surgical needles. Biomechanical performance studies of cutting edge needles made of S45500 stainless steel alloy and SURGALLOY™ stainless steel demonstrated that needles made of SURGALLOY™ had superior performance characteristics over those made of S45500. PMID:21284597

  15. 21 CFR 878.4493 - Absorbable poly(glycolide/l-lactide) surgical suture.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GENERAL AND PLASTIC SURGERY DEVICES Surgical Devices § 878.4493 Absorbable poly(glycolide/l -lactide) surgical suture....

  16. 21 CFR 878.4493 - Absorbable poly(glycolide/l-lactide) surgical suture.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ... FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GENERAL AND PLASTIC SURGERY DEVICES Surgical Devices § 878.4493 Absorbable poly(glycolide/l -lactide) surgical suture. (a)...

  17. 21 CFR 878.4493 - Absorbable poly(glycolide/l-lactide) surgical suture.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ... FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GENERAL AND PLASTIC SURGERY DEVICES Surgical Devices § 878.4493 Absorbable poly(glycolide/l -lactide) surgical suture. (a)...

  18. 21 CFR 878.4493 - Absorbable poly(glycolide/l-lactide) surgical suture.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ... FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GENERAL AND PLASTIC SURGERY DEVICES Surgical Devices § 878.4493 Absorbable poly(glycolide/l -lactide) surgical suture. (a)...

  19. 21 CFR 878.4493 - Absorbable poly(glycolide/l-lactide) surgical suture.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ... FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GENERAL AND PLASTIC SURGERY DEVICES Surgical Devices § 878.4493 Absorbable poly(glycolide/l -lactide) surgical suture. (a)...

  20. [Synthetic resorbable and synthetic non-resorbable suture materials in microvascular surgery. Animal experimental study].

    PubMed

    Dahlke, H; Dociu, N; Thurau, K

    1979-01-01

    In a series of experiments on the aorta of the rat, the behaviour of an absorbable monofilament suture VICRYL (Polyglactin 910) was compared to that of a non-absorbable suture ETHILON (Polyamide 6/6). A total of 86 rats was operated upon and examined over a period of 70 days. The report includes a complete description of experimental procedures and techniques used during the operations. The evaluation of the experiments took place after completion of the mechanical, histological and scanning electron microscopical tests. It has been proven that under similar conditions, the 0,2 metric suture VICRYL has adequate tensile strength to withstand the intravascular pressure in a vessel with an outer diameter of approx. 1,5 mm. Aneurysm, stenosis and dehiscence of the anastomosis did not occur. The VICRYL suture showed no reactive processes after a period of 42 days. With the suture ETHILON the inflammation of the media and the hyperplasia of the intima persisted even after 70 days, at the end of the experiment. It is therefore shown in microsurgery, the monofilament absorbable suture VICRYL and the non-absorbable monofilament suture ETHILON are equal in their mechanical qualities, but that the suture VICRYL has by far the better tissue compatibility. PMID:393576

  1. Arthroscopic Absorbable Suture Fixation for Tibial Spine Fractures

    PubMed Central

    Verdano, Michele Arcangelo; Pellegrini, Andrea; Lunini, Enricomaria; Tonino, Pietro; Ceccarelli, Francesco

    2013-01-01

    The purpose of this technical note and accompanying video is to describe a modified arthroscopic suture fixation technique to treat tibial spine avulsion fractures. Twenty-one patients underwent arthroscopic treatment for tibial spine avulsion with our technique; they were clinically and biomechanically evaluated at 2 years' follow-up and showed optimal clinical and radiographic outcomes. Repair with this arthroscopic technique provides a significant advantage in the treatment of type III and IV fractures of the tibial eminence by obtaining arthroscopic fixation within the substance of the anterior cruciate ligament: suture methods based on the avulsed bone fragment are technically impossible, but sutures through the base of the ligament itself provide secure fixation, reducing the risks of comminution of the fracture fragment and eliminating the time for hardware removal. This arthroscopic technique restores the length and the integrity of the anterior cruciate ligament and provides a simplified, reproducible method of treating patients, including young patients, with low hardware costs in comparison to sutures using anchors or other hardware. PMID:24749022

  2. Quantitative evaluation of stiffness of commercial suture materials.

    PubMed

    Chu, C C; Kizil, Z

    1989-03-01

    The bending stiffness of 22 commercial suture materials of varying size, chemical structure and physical form was quantitatively evaluated using a stiffness tester (Taber V-5, model 150B, Teledyne). The commercial sutures were Chromic catgut; Dexon (polyglycolic acid); Vicryl (polyglactin 910); PDS (polydioxanone); Maxon (polyglycolide-trimethylene carbonate); Silk (coated with silicone); Mersilene (polyester fiber); Tycron (polyester fiber); Ethibond (polyethylene terephthalate coated with polybutylene); Nurolon (nylon 66); Surgilon (nylon 66 coated with silicone); Ethilon (coated nylon 66), Prolene (polypropylene); Dermalene (polyethylene), and Gore-tex (polytetraflouroethylene). These are both natural and synthetic, absorbable and nonabsorbable and monofilament and multifilament sutures. All of these sutures were size 2-0, but Prolene sutures with sizes ranging from 1-0 to 9-0 were also tested to determine the effect of suture size on stiffness. The bending stiffness data obtained showed that a wide range of bending stiffness was observed among the 22 commercial sutures. The most flexible 2-0 suture was Gore-tex, followed by Dexon, Silk, Surgilon, Vicryl (uncoated), Tycron, Nurolon, Mersilene, Ethibond, Maxon, PDS, Ethilon, Prolene, Chromic catgut, coated Vicryl, and lastly, Dermalene. The large porous volume inherent in Gore-tex monofilament suture was the reason for its lowest flexural stiffness. Sutures with a braided structure were generally more flexible than those of a monofilament structure, irrespective of the chemical constituents. Coated sutures had significantly higher stiffness than the corresponding uncoated ones. This is particularly true when polymers rather than wax were used as the coating material. This increase in stiffness is attributable to the loss of mobility under bending force in the fibers and yarns that make up the sutures. An increase in the size of the suture significantly increased the stiffness, and the magnitude of increase depended on the chemical constituent of the suture. The flexural stiffness of sutures was also found to depend on the duration of bending in the test for stiffness. In general, monofilament sutures exhibited the largest time-dependent stiffness. This was most pronounced with the Gore-tex suture. Most braided sutures also showed less time-dependence in stiffness. Nylon sutures did not exhibit this time-dependent phenomenon regardless of physical form. PMID:2919353

  3. Systematic review of absorbable vs non-absorbable sutures used for the closure of surgical incisions

    PubMed Central

    Sajid, Muhammad S; McFall, Malcolm R; Whitehouse, Pauline A; Sains, Parv S

    2014-01-01

    AIM: To report a systematic review of published randomized controlled trials (RCTs) investigating the role of absorbable suture (AS) against non-AS (NAS) used for the closure of surgical incisions. METHODS: RCTs investigating the use of AS vs NAS for the closure of surgical incisions were statistically analysed based upon the principles of meta-analysis and the summated outcomes were represented as OR. RESULTS: The systematic search of medical literature yielded 10 RCTs on 1354 patients. Prevalence of wound infection (OR = 0.97; 95%CI: 0.56, 1.69; Z = 0.11; P = 0.92) and operative morbidity (P = 0.45) was comparable in both groups. Nonetheless, the use of AS lead to lower risk of wound break-down (OR = 0.12; 95%CI: 0.04, 0.39; Z = 3.52; P < 0.0004). CONCLUSION: This meta-analysis of 10 RCTs demonstrates that the use of AS is similar to NAS for skin closure for surgical site infection and other operative morbidities. AS do not increase the risk of skin wound dehiscence, rather lead to a reduced risk of wound dehiscence compared to NAS. PMID:25548609

  4. 21 CFR 878.4840 - Absorbable polydioxanone surgical suture.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...SERVICES (CONTINUED) MEDICAL DEVICES GENERAL AND PLASTIC SURGERY DEVICES Surgical Devices § 878.4840 Absorbable...tissue where growth is expected to occur, and ophthalmic surgery. It may be coated or uncoated, undyed or dyed,...

  5. 21 CFR 878.4840 - Absorbable polydioxanone surgical suture.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ...SERVICES (CONTINUED) MEDICAL DEVICES GENERAL AND PLASTIC SURGERY DEVICES Surgical Devices § 878.4840 Absorbable polydioxanone...cardiovascular tissue where growth is expected to occur, and ophthalmic surgery. It may be coated or uncoated, undyed or dyed, and...

  6. 21 CFR 878.4840 - Absorbable polydioxanone surgical suture.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...SERVICES (CONTINUED) MEDICAL DEVICES GENERAL AND PLASTIC SURGERY DEVICES Surgical Devices § 878.4840 Absorbable polydioxanone...cardiovascular tissue where growth is expected to occur, and ophthalmic surgery. It may be coated or uncoated, undyed or dyed, and...

  7. 21 CFR 878.4840 - Absorbable polydioxanone surgical suture.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...SERVICES (CONTINUED) MEDICAL DEVICES GENERAL AND PLASTIC SURGERY DEVICES Surgical Devices § 878.4840 Absorbable polydioxanone...cardiovascular tissue where growth is expected to occur, and ophthalmic surgery. It may be coated or uncoated, undyed or dyed, and...

  8. 21 CFR 878.4840 - Absorbable polydioxanone surgical suture.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...SERVICES (CONTINUED) MEDICAL DEVICES GENERAL AND PLASTIC SURGERY DEVICES Surgical Devices § 878.4840 Absorbable polydioxanone...cardiovascular tissue where growth is expected to occur, and ophthalmic surgery. It may be coated or uncoated, undyed or dyed, and...

  9. Cyclic testing of meniscal sutures.

    PubMed

    Seil, R; Rupp, S; Kohn, D M

    2000-01-01

    Suturing the meniscus has become a standard procedure for repairable tears. Studies investigating the outcome of meniscal sutures report a considerable rate of failures. Regarding the indications, which have been extended to the avascular zones, and regarding some accelerated rehabilitation protocols, the need for further in vitro investigations has become obvious. The aim of this study was to compare different meniscal suture types (vertical and horizontal mattress sutures) and materials (absorbable monofilament PDS 2-0, and nonabsorbable braided Ethibond 2-0 [Ethicon, Somerville, NJ]) under standard and cyclic loading conditions. Testing was performed on medial porcine menisci. In group A, specimens were tested to failure at a cross-head speed of 50 mm/minute. In group B, cyclic testing (100 cycles) was performed first within different load intervals (5 to 20 N and 5 to 40 N). Finally, the specimens were loaded until failure. In both groups, the failure loads were recorded and the failure modes were analyzed. In group A, there was no difference between suture type or suture material, with a mean failure load of 60 N. The failure modes were significantly different for vertical (100% suture failure) and horizontal sutures (50% suture failure) (P <.0001). In group B, 13% of the sutures failed under cyclic loading (7 with 40-N load, 1 with 20-N load). The gap of the sutured tear that appeared within the first load cycles was broader in horizontal sutures (P <.001). During the first cycles, the thread cut through the meniscus tissue and disappeared from the surface (partial tissue failure). There was no difference according to suture material. The ultimate failure loads after cyclic loading did not differ from the values of group A. These results show that meniscal sutures may fail under repetitive loading conditions and that a gap appears between the meniscal margins within the first loading cycles irrespective of the suture type and suture material used. The appearance of the gap and suture disappearance on the meniscal surface because of partial tissue failures (which were more pronounced in the horizontal sutures) confirmed the superior resistance of meniscal tissue to vertical sutures. PMID:10882446

  10. Vesical calculus formation on non-absorbable sutures used for open inguinal hernia repair

    PubMed Central

    Almarzouq, Ahmad; Mahmoud, Akram H.; Ashebu, Samuel D.; Kehinde, Elijah O.

    2014-01-01

    INTRODUCTION Iatrogenic injuries to the urogenital tract are rare, with the bladder being the organ most affected. We describe a case of a vesical calculus that formed on non-absorbable sutures that were used to repair an inguinal hernia. PRESENTATION OF CASE A 45-year-old male presented with frank haematuria and dysuria 2 years following an open left inguinal hernia repair. A CT urography showed a vesical calculus adherent to the left anterio-lateral wall of the bladder. Cystoscopy revealed that the calculus formed on non-absorbable sutures. Cystolapaxy was performed followed by cystoscopic excision of the sutures. The patient's post-operative course was uneventful. DISCUSSION Foreign bodies in the urinary bladder always act as a nidus for formation of a calculus. Iatrogenic bladder injuries are common during hernia repair. It is however rare for sutures used to repair an inguinal hernia to involve the urinary bladder wall. The patient most likely had a full bladder at the time of hernia repair or the bladder was part of the contents of the hernia sac. CONCLUSION This case illustrates the need to ensure that the bladder is empty prior to pelvic surgery and for surgeons to have a good understanding of inguinal anatomy to avoid injuring the contents of the hernia sac. PMID:25308188

  11. Open Reduction of Proximal Interphalangeal Fracture-Dislocation through a Midlateral Incision Using Absorbable Suture Materials

    PubMed Central

    Lee, Jae Jun; Choi, Hyun Gon; Shin, Dong Hyeok; Uhm, Ki Il

    2013-01-01

    Background Fracture-dislocation of the proximal interphalangeal (PIP) joint is a relatively common injury. Various treatments for fracture-dislocation of the PIP joint have been reported. In the present study, we performed open reduction through a midlateral incision using absorbable sutures to reduce the small bone fragments and performed volar plate repair. Methods We treated nine patients with fracture-dislocation of the PIP joint with small fractured bone fragments too small for pinning or screw fixation. Patients with volar plate injury were treated with open reduction and volar plate repair at the periosteum of the middle phalangeal bone base by the modified Kessler method using absorbable sutures. All patients were placed in a dorsal aluminum extension block splint, which maintained the PIP joint in approximately 30 degrees of flexion to avoid excessive tension on the sutured volar plate. Results At a mean final follow-up of postoperative 9 months, all patients were evaluated radiographically and had adequate alignment of the PIP joint and reduction of the displaced bone fragments. Range of motion was improved and there were no complications. Conclusions This technique is an excellent alternative to the current method of treating patients with fracture-dislocations that include small fragments that are too small for pinning or screw fixation. It is a less invasive surgical method and enables stable reduction and early exercise without noticeable complications. PMID:23898438

  12. Performance Assessment of Suture Type, Water Temperature, and Surgeon Skill in Juvenile Chinook Salmon Surgically Implanted with Acoustic Transmitters

    SciTech Connect

    Deters, Katherine A.; Brown, Richard S.; Carter, Kathleen M.; Boyd, James W.; Eppard, M. B.; Seaburg, Adam

    2010-05-01

    This study assessed performance of seven suture types in subyearling Chinook salmon Oncorhynchus tshawytscha implanted with acoustic microtransmitters. Nonabsorbable (Ethilon) and absorbable (Monocryl) monofilament and nonabsorbable (Nurolon, silk) and absorbable (Vicryl, Vicryl Plus, Vicryl Rapide) braided sutures were used to close incisions in Chinook salmon. Monocryl exhibited greater suture retention than all other suture types 7 d after surgery. Both monofilament suture types were retained better than all braided suture types at 14 d. Incision openness and tag retention did not differ among suture types. Wound inflammation was similar for Ethilon, Monocryl, and Nurolon at 7 d. Wound ulceration was lower for Ethilon, Monocryl, and Nurolon than for all other suture types at 14 d post-surgery. Fish held in 12°C water had more desirable post-surgery healing characteristics (i.e., higher suture and tag retention and lower incision openness, wound inflammation, and ulceration) at 7 and 14 d after surgery than those held in 17°C water. The effect of surgeon was a significant predictor for all response variables at 7 d. This result emphasizes the importance of including surgeon as a variable in telemetry study analyses when multiple surgeons are used. Monocryl performed better with regard to post-surgery healing characteristics in the study fish. The overall results support the conclusion that Monocryl is the best suture material to close incisions created during surgical implantation of acoustic microtransmitters in subyearling Chinook salmon.

  13. 21 CFR 878.4494 - Absorbable poly(hydroxybutyrate) surgical suture produced by recombinant DNA technology.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ...surgical suture produced by recombinant DNA technology. 878.4494 Section 878...surgical suture produced by recombinant DNA technology. (a) Identification...produced by recombinant deoxyribonucleic acid (DNA) technology. The device is intended...

  14. 21 CFR 878.4494 - Absorbable poly(hydroxybutyrate) surgical suture produced by recombinant DNA technology.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...surgical suture produced by recombinant DNA technology. 878.4494 Section 878...surgical suture produced by recombinant DNA technology. (a) Identification...produced by recombinant deoxyribonucleic acid (DNA) technology. The device is intended...

  15. 21 CFR 878.4494 - Absorbable poly(hydroxybutyrate) surgical suture produced by recombinant DNA technology.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...surgical suture produced by recombinant DNA technology. 878.4494 Section 878...surgical suture produced by recombinant DNA technology. (a) Identification...produced by recombinant deoxyribonucleic acid (DNA) technology. The device is intended...

  16. 21 CFR 878.4494 - Absorbable poly(hydroxybutyrate) surgical suture produced by recombinant DNA technology.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...surgical suture produced by recombinant DNA technology. 878.4494 Section 878...surgical suture produced by recombinant DNA technology. (a) Identification...produced by recombinant deoxyribonucleic acid (DNA) technology. The device is intended...

  17. 21 CFR 878.4494 - Absorbable poly(hydroxybutyrate) surgical suture produced by recombinant DNA technology.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...surgical suture produced by recombinant DNA technology. 878.4494 Section 878...surgical suture produced by recombinant DNA technology. (a) Identification. ...produced by recombinant deoxyribonucleic acid (DNA) technology. The device is intended...

  18. Microbiology of Explanted Suture Segments from Infected and Noninfected Surgical Patients

    PubMed Central

    Krepel, Candace J.; Marks, Richard M.; Rossi, Peter J.; Sanger, James; Goldblatt, Matthew; Graham, Mary Beth; Rothenburger, Stephen; Collier, John; Seabrook, Gary R.

    2013-01-01

    Sutures under selective host/environmental factors can potentiate postoperative surgical site infection (SSI). The present investigation characterized microbial recovery and biofilm formation from explanted absorbable (AB) and nonabsorbable (NAB) sutures from infected and noninfected sites. AB and NAB sutures were harvested from noninfected (70.9%) and infected (29.1%) sites in 158 patients. At explantation, devices were sonicated and processed for qualitative/quantitative bacteriology; selective sutures were processed for scanning electron microscopy (SEM). Bacteria were recovered from 85 (53.8%) explanted sites; 39 sites were noninfected, and 46 were infected. Suture recovery ranged from 11.1 to 574.6 days postinsertion. A significant difference in mean microbial recovery between noninfected (1.2 isolates) and infected (2.7 isolates) devices (P < 0.05) was noted. Staphylococcus epidermidis, Staphylococcus aureus, coagulase-negative staphylococci (CNS), Peptostreptococcus spp., Bacteroides fragilis, Escherichia coli, Enterococcus spp., Pseudomonas aeruginosa, and Serratia spp. were recovered from infected devices, while commensal skin flora was recovered from noninfected devices. No significant difference in quantitative microbial recovery between infected monofilament and multifilament sutures was noted. Biofilm was present in 100% and 66.6% of infected and noninfected devices, respectively (P < 0.042). We conclude that both monofilament and braided sutures provide a hospitable surface for microbial adherence: (i) a significant difference in microbial recovery from infected and noninfected sutures was noted, (ii) infected sutures harbored a mixed flora, including multidrug-resistant health care-associated pathogens, and (iii) a significant difference in the presence or absence of a biofilm in infected versus noninfected explanted devices was noted. Further studies to document the benefit of focused risk reduction strategies to minimize suture contamination and biofilm formation postimplantation are warranted. PMID:23175247

  19. Mechanical comparison of 10 suture materials before and after in vivo incubation.

    PubMed

    Greenwald, D; Shumway, S; Albear, P; Gottlieb, L

    1994-04-01

    The material properties of ten 2-O suture materials were evaluated tensiometrically at time = 0 and again after 6 weeks incubation in rats. All suture material was incubated and tested without knots. Specialized machinery was used with a custom securing apparatus to pull suture material apart at constant speed. Stress-strain curves were derived, and from these strength, toughness, strain at rupture, and elastic modulus were determined. Sutures tested included Vicryl [poly(glycolide-lactide)], Dexon (polyglycolic acid), Ethibond (polyester), silk, plain gut, chromic gut, Maxon (polyglyconate), PDS (polydioxanone), nylon, and Prolene (polypropylene). Elastic modulus was greatest for braided, least for monofilament, and intermediate for gut sutures, regardless of chemical composition (ANOVA, P = 0.0001). Strength, strain, and toughness decreased in all of the sutures over time in vivo with the exception of braided polyester (Ethibond), which remained stable. Silk demonstrated the least strength and toughness while PDS and Maxon were the strongest and toughest at time = 0. Vicryl, Dexon, and gut sutures were absorbed to the point that they could not be tested after 6 weeks in vivo. Performance tables are provided for all sutures. PMID:8152233

  20. Comparison of piezoresistive monofilament polymer sensors.

    PubMed

    Melnykowycz, Mark; Koll, Birgit; Scharf, Dagobert; Clemens, Frank

    2014-01-01

    The development of flexible polymer monofilament fiber strain sensors have many applications in both wearable computing (clothing, gloves, etc.) and robotics design (large deformation control). For example, a high-stretch monofilament sensor could be integrated into robotic arm design, easily stretching over joints or along curved surfaces. As a monofilament, the sensor can be woven into or integrated with textiles for position or physiological monitoring, computer interface control, etc. Commercially available conductive polymer monofilament sensors were tested alongside monofilaments produced from carbon black (CB) mixed with a thermo-plastic elastomer (TPE) and extruded in different diameters. It was found that signal strength, drift, and precision characteristics were better with a 0.3 mm diameter CB/TPE monofilament than thick (~2 mm diameter) based on the same material or commercial monofilaments based on natural rubber or silicone elastomer (SE) matrices. PMID:24419161

  1. Sutures - ridged

    MedlinePLUS

    Ridged sutures ... borders at which these plates intersect are called sutures or suture lines. In an infant only a few minutes ... head, making the bony plates overlap at the sutures and creating a small ridge. This is normal ...

  2. Load bearing and deformation characteristics of monofilament nylon 66 and their implications for ophthalmic surgery

    NASA Astrophysics Data System (ADS)

    Clark, D.; Fleming, W.; Bosanquet, R.; Down, E.

    1996-07-01

    The load bearing and deformation characteristics of monofilament nylon 66 have been examined. This material has been shown to have increased strength and altered deformation properties compared to bulk nylon. These features are beneficial in its role as a corneal suture. However, the load bearing performance of monofilament nylon 66 has been shown to be influenced by the manner in which it is stressed, making the task of producing identical stitches difficult. Moreover, a period of rapid relaxation has been shown to occur immediately after installation which makes the time taken to install the suture a critical factor in its subsequent performance. These factors, which are essentially beyond the control of the ophthalmic surgeon, must surely play a significant role in the inconsistent post operative results seen.

  3. Development of large diameter carbon monofilament

    NASA Technical Reports Server (NTRS)

    Jacob, B.; Neltri, R. D.

    1973-01-01

    A process for preparing large diameter carbon-boron monofilament was developed. The process involves chemical vapor depositing a carbon-boron alloy monofilament from a BCl3, CH4, and H2 gas mixture onto a carbon substrate. Amorphous alloys were formed when gaseous mixtures containing greater than 20 percent methane (80 percent BCl3) were used. The longest uninterrupted lengths of carbon-boron monofilament were produced using a CH4/BCl3 gas ratio of 2.34. It was found that the properties of the carbon-boron alloy monofilament improved when the carbon substrate was precleaned in chlorine. The highest strength monofilament was attained when a CH4/BCl3 gas volume ratio of 0.44 was 28 million N/sq cm (40 million psi). While the highest strengths were attained in this run, the 0.44 gas ratio and other CH4/BCl3 ratios less than 2.34 would not yield long runs. Runs using these ratios were usually terminated because of a break in the monofilament within the reactor. It is felt better process control could probably be achieved by varying the amount of hydrogen; the BCl3/H2 ratio was kept constant in these studies.

  4. Does UV disinfection compromise sutures? An evaluation of tissue response and suture retention in salmon surgically implanted with transmitters

    SciTech Connect

    Walker, Ricardo W.; Brown, Richard S.; Deters, Katherine A.; Eppard, M. B.; Cooke, Steven J.

    2013-10-01

    Ultraviolet radiation (UVR) can be used as a tool to disinfect surgery tools used for implanting transmitters into fish. However, the use of UVR could possibly degrade monofilament suture material used to close surgical incisions. This research examined the effect of UVR on monofilament sutures to determine if they were compromised and negatively influenced tag and suture retention, incision openness, or tissue reaction. Eighty juvenile Chinook salmon Oncorhynchus tshawytscha were surgically implanted with an acoustic transmitter and a passive integrated transponder. The incision was closed with a single stitch of either a suture exposed to 20 doses of UV radiation (5 minute duration per dose) or a new, sterile suture. Fish were then held for 28 d and examined under a microscope at day 7, 14, 21 and 28 for incision openness, ulceration, redness, and the presence of water mold. There was no significant difference between treatments for incision openness, redness, ulceration or the presence of water mold on any examination day. On day 28 post-surgery, there were no lost sutures; however, 2 fish lost their transmitters (one from each treatment). The results of this study do not show any differences in negative influences such as tissue response, suture retention or tag retention between a new sterile suture and a suture disinfected with UVR.

  5. Tissue Adhesive Versus Suture Wound Repair at 1 Year: Randomized Clinical Trial Correlating Early, 3Month, and 1Year Cosmetic Outcome

    Microsoft Academic Search

    James Quinn; George Wells; Terri Sutcliffe; Mario Jarmuske; Jennifer Maw; Ian Stiell; Peter Johns

    1998-01-01

    Study Objective: To compare the 1-year cosmetic outcome of wounds treated with octylcyanoacrylate tissue adhesive and monofilament sutures and to correlate the early, 3-month, and 1-year cosmetic outcomes. Methods: We prospectively randomized 136 cases of traumatic laceration to repair with octylcyanoacrylate tissue adhesive or 5-0 or smaller monofilament suture. A wound score was assigned by a research nurse, and validated

  6. Evaluation of the gross and histologic reactions to five commonly used suture materials in the skin of the African clawed frog (Xenopus laevis).

    PubMed

    Tuttle, Allison D; Law, J Mac; Harms, Craig A; Lewbart, Gregory A; Harvey, Stephen B

    2006-11-01

    Surgical harvest of Xenopus laevis oocytes for developmental research is a common procedure that requires closure of a 0.5- to 2.0-cm incision with suture material. Although such harvests are a frequent practice, little published information exists to provide guidance regarding the most appropriate suture material for wound closure in laboratory amphibians. To determine which suture material elicits the least response in amphibian skin, we used Xenopus laevis as a model to investigate the gross and histologic tissue reactions to 5 commonly used suture materials-3-0 silk, monofilament nylon, polydioxanone, polyglactin 910, and chromic gut. The skin reacted in 3 ways to suture material, showing edema, epidermal changes, and inflammation. Although the gross reactions to monofilament nylon, polydioxanone, and polyglactin 910 were clinically indistinguishable and were associated with lowest gross reaction scores, monofilament nylon elicited the least histologic reaction and therefore seems to be the most appropriate choice for use in amphibian skin. PMID:17089987

  7. Large-diameter carbon-composite monofilaments. [production method and characteristics of carbon composite monofilaments

    NASA Technical Reports Server (NTRS)

    Bradshaw, W. G.; Pinoli, P. C.; Karlak, R. F.

    1974-01-01

    Large-diameter carbon composite monofilaments with high strength and high modulus were produced by pregging multifiber carbon bundles with suitable organic resins and pyrolysing them together. Two approaches were developed to increase the utilization of fiber tensile strength by minimizing stress concentration defects induced by dissimilar shrinkage during pyrolysis. These were matrix modification to improve char yield and strain-to-failure and fiber-matrix copyrolysis to alleviate matrix cracking. Highest tensile strength and modulus were obtained by heat treatments to 2873 K to match fiber and matrix strain-to-failure and develop maximum monofilament tensile-strength and elastic modulus.

  8. Cranial sutures

    MedlinePLUS

    ... The cranial bones remain separate for about 12-18 months. They then grow together as part of normal ... fontanelle usually closes sometime between 9 months and 18 months. The sutures and fontanelles are needed for the ...

  9. Tissue reactions to suture materials in the oral mucosa of beagle dogs

    PubMed Central

    Kim, Jae-Seok; Shin, Seung-Il; Herr, Yeek; Park, Joon-Bong; Kwon, Young-Hyuk

    2011-01-01

    Purpose The objective of this study was to compare and evaluate the inflammatory responses of three widely used suture materials in the keratinized gingiva and buccal mucosa of beagle dogs. Methods Silk, polyglycolic acid, and nylon sutures were placed within the mandibular keratinized gingiva and maxillary buccal mucosa of four male beagle dogs. Biopsies were taken 3, 7, and 14 days after suturing. Specimens were prepared with hematoxylin-eosin stain for evaluation under a light microscope. Results The suture materials placed in the oral mucosa elicited more inflammatory reactions than did those placed in the keratinized gingiva. The multifilament suture materials caused more inflammatory tissue reactions than did the monofilament suture materials in the oral mucosa. Conclusions If oral hygiene is well maintained and suture materials are placed in the keratinized gingiva, silk, nylon, and polyglycolic acid are considered to be proper suture materials for oral surgery. However, it is advisable to use monofilament suture materials if the suture site is within the oral mucosa. PMID:21954423

  10. Influence of suturing on wound healing.

    PubMed

    Burkhardt, Rino; Lang, Niklaus P

    2015-06-01

    The present article describes the significance of suturing and appropriate suture materials in current periodontal and implant surgery. Synthetic, nonresorbable, monofilament threads appear to be advantageous. The physical and biological properties of such threads remain unchanged with use and, when used in small diameters (i.e. with lower breaking resistance), seem to promote passive wound closure. Wound healing at hard, nonshedding surfaces is conceptually a more complex process than is wound healing in most other sites of the oral cavity. Firm adaptation and stabilization of the flaps by optimal suturing ensures adhesion of the delicate fibrin clot to the nonshedding surface. The early formation and mechanical stability of the blood clot between the mucosal or mucoperiosteal flap and the wound bed are of paramount importance and hence suturing techniques must be considered as a key prerequisite to ensure optimal surgical outcomes. With the sophisticated surgical procedures now applied, there is a greater need for knowledge with regard to the various types of suturing techniques and materials available in order to achieve the above-mentioned goals. PMID:25867989

  11. [Behavior of resorbable and nonresorbable suture material in lymph vessel suture].

    PubMed

    Baumeister, R G; Seifert, J; Wiebecke, B

    1982-01-01

    After transverse division of the abdominal thoracic duct of the rat, 14 anastomoses were performed using synthetic absorbable (Polyglactin 910, Vicryl) and synthetic non-absorbable (Polyamid 6.6, Ethilon) suture material. The anastomoses were achieved by means of a tension-free technique using interrupted sutures. The follow-up period was from 28 to 133 days. Clinical observation showed that all anastomoses were patent. However, with the aid of staining methods only five out of seven anastomoses were shown to be patent. Using absorbable suture material, a lumen was demonstrable at all anastomoses, while using non-absorbable suture material this could be proved in only four out of seven anastomoses. The foreign body reaction diminished with time when absorbable material was employed, whereas it persisted with non-absorbable material. PMID:6763587

  12. A historically controlled, single-arm, multi-centre, prospective trial to evaluate the safety and efficacy of MonoMax® suture material for abdominal wall closure after primary midline laparotomy. ISSAAC-Trial [NCT005725079

    PubMed Central

    Fischer, Lars; Baumann, Petra; Hüsing, Johannes; Seidlmayer, Christoph; Albertsmeier, Markus; Franck, Annette; Luntz, Steffen; Seiler, Christoph M; Knaebel, Hanns-Peter

    2008-01-01

    Background Several randomized controlled trials have compared different suture materials and techniques for abdominal wall closure with respect to the incidence of incisional hernias after midline laparotomy and shown that it remains, irrespective of the methods used, considerably high, ranging from 9% to 20%. The development of improved suture materials which would reduce postoperative complications may help to lower its frequency. Design This is a historically controlled, single-arm, multi-centre, prospective trial to evaluate the safety of MonoMax® suture material for abdominal wall closure in 150 patients with primary elective midline incisions. INSECT patients who underwent abdominal closure using Monoplus® and PDS® will serve as historical control group. The incidences of wound infections and of burst abdomen are defined as composite primary endpoints. Secondary endpoints are the frequency of incisional hernias within one year after operation and safety. To ensure adequate comparability in surgical performance and recruitment, the 4 largest centres of the INSECT-Trial will participate. After hospital discharge, the investigators will examine the enrolled patients again at 30 days and at 12 ± 1 months after surgery. Conclusion This historically controlled, single-arm, multi-centre, prospective ISSAAC trial aims to assess whether the use of an ultra-long-lasting absorbable monofilament suture material is safe and efficient. Trial registration NCT005725079 PMID:18644124

  13. Looped suture properties: implications for multistranded flexor tendon repair.

    PubMed

    Haddad, R; Peltz, T; Bertollo, N; Walsh, W R; Nicklin, S

    2015-03-01

    Multiple-strand repair techniques are commonly used to repair cut flexor tendons to achieve initial biomechanical strength. Looped sutures achieve multiple strands with fewer passes and less technical complexity. Their biomechanical performance in comparison with an equivalent repair using a single-stranded suture is uncertain. This study examined the mechanical properties of double-stranded loops of 3-0 and 4-0 braided polyester (Ticron) and polypropylene monofilament (Prolene). Double loops were generally less than twice the strength of a single loop. Ticron and Prolene had the same strengths, but Ticron was stiffer. The 4-0 double loops had significantly higher stiffness than 3-0 single loops. Increasing the size of sutures had a larger relative effect on strength than using a double-stranded suture. However, a double-strand loop had a larger effect on increasing stiffness than using a single suture of a larger equivalent size. Looped suture repairs should be compared with standard techniques using a thicker single suture. PMID:25698798

  14. Diabetic foot screening: new technology versus 10g monofilament.

    PubMed

    Spruce, Michelle C; Bowling, Frank L

    2012-03-01

    The objective was to determine if new technology could provide feedback to the clinician when a 10g force had been delivered. Using a novel electronic force sensor, clinical longevity and the potential for reduced force delivery were assessed under laboratory conditions. Subsequent inter- and intrareliability data were generated and compared with the existing World Health Organization clinical standard (10g monofilament). A total of 20 subjects were trained in the use of the 10g monofilament (Bailey Instruments, Salford Quays, UK) and prototype electronic force sensor (Exsensus, UK). A total of 2000 applications (n = 100 per subject) were administered to a calibrated target at a controlled rate, while time and force histories were captured on a digital storage oscilloscope and data recorder for statistical analysis. Engineering standards in accordance with the American Society for Testing and Materials were applied throughout the experiment. No significant differences in mean peak, median peak, interquartile range, and total range of pressure forces were observed for the electronic force sensor. Alternatively, significant differences for mean and median peak forces were present in the 10g monofilament (P < .05 and P < .01). Post hoc analysis further showed the monofilament to degrade significantly at ?30 applications (P = .013). Forces delivered by the electronic force sensor appear to be significantly less susceptible to mechanical variability than those provided by monofilaments, thus increasing longevity. Similarly, this new technology provides objective feedback as to when the device is functioning correctly and potentially negates the need for fiber rest periods. PMID:22334598

  15. Mechanical properties of suture materials in general and cutaneous surgery.

    PubMed

    Naleway, Steven E; Lear, William; Kruzic, Jamie J; Maughan, Cory B

    2014-07-18

    Comprehensive studies comparing tensile properties of sutures are over 25 years old and do not include recent advances in suture materials. Accordingly, the objective of this article is to investigate the tensile properties of commonly used sutures in cutaneous surgery. Thirteen 3-0 sized modern sutures (four nonabsorbable and nine absorbable) were tensile tested in both straight and knotted configurations according to the procedures outlined by the United States Pharmacopeia. Glycomer 631 was found to have the highest failure load (56.1 N) of unknotted absorbable sutures, while polyglyconate (34.2 N) and glycomer 631 (34.3 N) had the highest failure loads of knotted absorbable sutures. Nylon (30.9 N) and polypropylene (18.9 N) had the greatest failure loads of straight and knotted nonabsorbable sutures, respectively. Polydioxane was found to have the most elongation prior to breakage (144%) of absorbable sutures. Silk (8701 MPa) and rapid polyglactin 910 (9320 MPa) had the highest initial modulus of nonabsorbable and absorbable sutures, respectively. The new data presented in the study provide important information for guiding the selection of suture materials for specific surgeries. © 2014 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 2014. PMID:25045025

  16. Post thyroidectomy suture granuloma: a cytological diagnosis.

    PubMed

    Javalgi, Anita P; Arakeri, Surekha U

    2013-04-01

    There are known post thyroidectomized complications, a suture granuloma being less frequent, with its late complication mimicking recurrent thyroid cancer. A suture granuloma is a benign, granulomatous inflammatory reaction that occurs due to the use of non absorbable suture. It constitutes one of the late complications which altogether make up less than 2% of its incidence. A suture granuloma is similar to a foreign body reaction and it usually develops slowly as a painless, palpable asymptomatic mass over the years. It mimics a cancer recurrence or a lymph node metastasis. Here, we are reporting a case of a post thyroidectomy suture granuloma in a 46 years old lady who presented with a painless swelling in the lateral neck, with a past history of thyroidectomy 5 years back. PMID:23730655

  17. Comparison of 10-0 polypropylene and 10-0 nylon sutures in rat arterial anastomosis.

    PubMed

    Chen, L E; Seaber, A V; Urbaniak, J R

    1993-01-01

    The selection of suture materials is an important factor in further improving the results of microsurgical operations. In this study, two kinds of nonabsorbable suture materials, 10-0 polypropylene and 10-0 nylon monofilament, were compared in end-to-end anastomosis of 66 femoral arteries of adult rats. Both suture types were of identical size (70 microns needle/28 microns suture) and each artery received eight sutures. The vessels were harvested at various intervals from 2 hr to 180 days postoperatively and were evaluated by pathology, radiology, and tensile strength test. The results show that both sutures are capable of achieving excellent long-term patency (100%) of anastomosed sites. Polypropylene suture was equivalent to nylon in mechanical integrity of the anastomosis sites but was superior in handling, knotting, and biocompatibility. These physical and biological properties of polypropylene sutures may offer the benefits of diminished early and late complications at anastomosis sites and reduced operation time. Enhancement of contrast against surrounding tissue may make polypropylene a superior alternative to nylon sutures for microsurgical use. PMID:8332053

  18. Horizontal running mattress suture modified with intermittent simple loops.

    PubMed

    Chacon, Anna H; Shiman, Michael I; Strozier, Narissa; Zaiac, Martin N

    2013-01-01

    Using the combination of a horizontal running mattress suture with intermittent loops achieves both good eversion with the horizontal running mattress plus the ease of removal of the simple loops. This combination technique also avoids the characteristic railroad track marks that result from prolonged non-absorbable suture retention. The unique feature of our technique is the incorporation of one simple running suture after every two runs of the horizontal running mattress suture. To demonstrate its utility, we used the suturing technique on several patients and analyzed the cosmetic outcome with post-operative photographs in comparison to other suturing techniques. In summary, the combination of running horizontal mattress suture with simple intermittent loops demonstrates functional and cosmetic benefits that can be readily taught, comprehended, and employed, leading to desirable aesthetic results and wound edge eversion. PMID:23723610

  19. A microsurgical procedure for middle cerebral artery occlusion by intraluminal monofilament insertion technique in the rat: a special emphasis on the methodology

    PubMed Central

    2014-01-01

    Introduction Although there are many experimental studies describing the methodology of the middle cerebral artery occlusion (MCAO) in the literature, only limited data on these distinct anatomical structures and the details of the surgical procedure in a step by step manner. The aim of the present study simply is to examine the surgical anatomy of MCAO model and its modifications in the rat. Materials and methods Forty Sprague-Dawley rats were used; 20 during the training phase and 20 for the main study. The monofilament sutures were prepared as described in the literature. All surgical steps of the study were performed under the operating microscope, including insertion of monofilament into middle cerebral artery through the internal carotid artery. Results After an extensive training period, we lost two rats in four weeks. The effects of MCAO were confirmed by the evidence of severe motor deficit during the recovery period, and histopathological findings of infarction were proved in all 18 surviving rats. Conclusion In this study, a microsurgical guideline of the MCAO model in the rat is provided with the detailed description of all steps of the intraluminal monofilament insertion method with related figures. PMID:24949193

  20. Further development of chemical vapor deposition process for production of large diameter carbon-base monofilaments

    NASA Technical Reports Server (NTRS)

    Hough, R. L.; Richmond, R. D.

    1974-01-01

    The development of large diameter carbon-base monofilament in the 50 micron to 250 micron diameter range using the chemical vapor deposition process is described. The object of this program was to determine the critical process variables which control monofilament strength, monofilament modulus, and monofilament diameter. It was confirmed that wide scatter in the carbon substrate strength is primarily responsible for the scatter in the monofilament strength. It was also shown through etching experiments that defective substrate surface conditions which can induce low strength modular growth in the monofilament layers are best controlled by processing improvements during the synthesis of the substrate. Modulus was found to be linearily proportional to monofilament boron content. Filament modulus was increased to above 27.8MN/sq cm but only by a considerable increase in monofilament boron content to 60 wt. % or more. Monofilament diameter depended upon dwell time in the synthesis apparatus. A monofilament was prepared using these findings which had the combined properties of a mean U.T.S. of 398,000 N/sq cm, a modulus of 18.9 MN/sq cm (24,000,000 psi), and a diameter of 145 microns. Highest measured strength for this fiber was 451,000 N/sq cm (645,000 psi).

  1. Biomechanical evaluation of finger trap suture variants for securing catheters.

    PubMed

    Ricker, Zachary H; Rochat, Mark C; Payton, Mark E

    2015-03-01

    Objective-To biomechanically evaluate various finger trap patterns and suture materials for securing 5F polyvinylchloride and polypropylene catheters. Design-In vitro prospective study. Sample-132 finger trap constructs. Procedures-Each group of constructs comprised 6 to 10 replicates each of 3 finger trap patterns tied with 2-0 glycolide-lactide copolymer (GLC), braided nylon, and monofilament polypropylene suture on 5F polypropylene and polyvinylchloride catheters. The 3 finger trap variants were of similar lengths but differed in the number of surgeon's throws included in the pattern. Constructs were tested with a universal materials testing machine to the point of failure or a maximum of 100 mm of distraction. Force and distraction data were evaluated for significance with a competing risks model. Results-There was no difference in performance (as measured by the proportion of test failures, median distraction distance, or median force at failure or end of testing) attributable to the finger trap pattern variants. Sixteen of 66 constructs with polyvinylchloride catheter material failed at ? 100 mm distraction, whereas all polypropylene constructs failed during testing. For polypropylene catheters, braided nylon or GLC suture withstood greater distraction distance and force, respectively. For polyvinylchloride catheters, differences among suture types were nonsignificant. Conclusions and Clinical Relevance-Data suggested that, for the material combinations evaluated, a finger trap suture pattern with fewer knots may provide catheter security similar to that for patterns tied with a more traditional pattern. These results should not be extrapolated to catheters of different diameters or materials, patterns tied with different suture sizes, or clinical performance in vivo without further testing. PMID:25671283

  2. Nanostructured medical sutures with antibacterial properties.

    PubMed

    Serrano, Cristina; García-Fernández, Luis; Fernández-Blázquez, Juan Pedro; Barbeck, Mike; Ghanaati, Shahram; Unger, Ron; Kirkpatrick, James; Arzt, Eduard; Funk, Lutz; Turón, Pau; Del Campo, Aránzazu

    2015-06-01

    Bacterial repellence in suture materials is a desirable property that can potentially improve the healing process by preventing infection. We describe a method for generating nanostructures at the surface of commercial sutures of different composition, and their potential for preventing biofilm formation. We show how bacteria attachment is altered in the presence of nanosized topographies and identify optimum designs for preventing it without compromising biocompatibility and applicability in terms of nanostructure robustness or tissue friction. These studies open new possibilities for flexible and cost-effective realization of topography-based antibacterial coatings for absorbable biomedical textiles. PMID:25818435

  3. The use of a new suture material (Polydioxanone) in the biliary tract.

    PubMed Central

    Hoile, R. W.

    1983-01-01

    The use of a new synthetic absorbable suture material, polydioxanone, has been assessed over a period in excess of three years in 63 patients undergoing surgical procedures on the biliary tract. The material, which was used exclusively for all ligatures and sutures, has greater pliability and strength than other absorbable materials and was found to be highly satisfactory. No suture-related complications were identified and the handling properties of the material were excellent. This material can be recommended for use in the biliary tract where it is desirable to use a reliable absorbable suture which evokes minimal tissue reaction. PMID:6407382

  4. Broken nylon iris fixation sutures.

    PubMed

    Cohan, B E; Pearch, A C; Schwartz, S

    1979-12-01

    Broken nylon iris sutures, used to fixate the Worst suture lens, occurred in 41 of a series of 215 eyes, a remarkably high frequency. The estimated average time to break was 27.8 months. Over three fourths of the borken sutures were discovered incidentally on a return visit. Complications related to the broken suture occurred in 21 eyes. The characteristic complication was corneal epithelial edema caused by intermittent touch of the endothelium by the broken suture; spontaneous lens dislocation was infrequent. Light and scanning electron microscopy revealed that biodegradation caused the suture break. Broken iris sutures can be avoided by fixation of the lens with a nonbiodegradable suture. PMID:517621

  5. Water-tight knee arthrotomy closure: comparison of a novel single bidirectional barbed self-retaining running suture versus conventional interrupted sutures.

    PubMed

    Nett, Michael; Avelar, Rui; Sheehan, Michael; Cushner, Fred

    2011-03-01

    Standard medial parapatellar arthrotomies of 10 cadaveric knees were closed with either conventional interrupted absorbable sutures (control group, mean of 19.4 sutures) or a single running knotless bidirectional barbed absorbable suture (experimental group). Water-tightness of the arthrotomy closure was compared by simulating a tense hemarthrosis and measuring arthrotomy leakage over 3 minutes. Mean total leakage was 356 mL and 89 mL in the control and experimental groups, respectively (p = 0.027). Using 8 of the 10 knees (4 closed with control sutures, 4 closed with an experimental suture), a tense hemarthrosis was again created, and iatrogenic suture rupture was performed: a proximal suture was cut at 1 minute; a distal suture was cut at 2 minutes. The impact of suture rupture was compared by measuring total arthrotomy leakage over 3 minutes. Mean total leakage was 601 mL and 174 mL in the control and experimental groups, respectively (p = 0.3). In summary, using a cadaveric model, arthrotomies closed with a single bidirectional barbed running suture were statistically significantly more water-tight than those closed using a standard interrupted technique. The sample size was insufficient to determine whether the two closure techniques differed in leakage volume after suture rupture. PMID:21618939

  6. The effect of temperature and drawing ratio on the mechanical properties of polypropylene monofilaments

    NASA Astrophysics Data System (ADS)

    Taheri, Hesam; Nóbrega, João Miguel; Samyn, Pieter; Covas, José Antonio

    2014-05-01

    In this work, the simultaneous effect of both temperature and drawing ratio during processing of polypropylene monofilaments has been investigated. The basis of this work specifically aims at emphasizing the conditions of temperature and drawing ratio applied in the cooling bath, in order to find out under which conditions the named parameters can be applied in a processing line under continuous extrusion. The effects of temperature are studied for a constant total drawing ratio to analyze the influences on mechanical properties and structural differences of the final polypropylene monofilament. The quenched monofilaments were drawn around an adjustable guide assembly in the quench bath and first drawing stage, imparting thermal and mechanical treatments to the filaments. In the heating stage, monofilaments are affected to high-speed draw rolls while passing through the oven. As such, the best conditions to produce a polypropylene monofilament with high tenacity strength were determined. Results of this study show that the monofilament properties are significantly affected by temperature in the cooling zone. The nature of the first drawing had a significant effect on the end properties and monofilaments with modulus of 637 MPa have finally been manufactured. We have also proposed a new hypothesis, which is termed "gap nucleation" and determine this phenomenon in the gap between die and cooling bath.

  7. Gross and histologic evaluation of 5 suture materials in the skin and subcutaneous tissue of the California sea hare (Aplysia californica).

    PubMed

    Anderson, Eric T; Davis, A Sally; Law, J McHugh; Lewbart, Gregory A; Christian, Larry S; Harms, Craig A

    2010-01-01

    Invertebrates are increasing in their importance to both the public and private aquarium trade and play a vital role in biomedical research. Surgical techniques have become an important approach to obtaining data and maintaining good health in both of these areas. However, studies examining tissue reaction to suture material in invertebrates are lacking. The current study evaluated the gross and histologic reaction of Aplysia californica to 5 commonly used suture materials, including polydioxanone, black braided silk, polyglactin 910, monofilament nylon, and monofilament poliglecaprone. Histologic samples were graded on the amount of edema (score, 1 to 4), inflammation (1 to 4), and granuloma formation (1 to 4) present, and a final overall histology score (1 to 6) was assigned to each sample. Compared with untreated control tissue, all suture materials caused significantly increased tissue reaction, but the overall histology score did not differ among the suture materials. Silk was the only suture that did not have a significantly increased granuloma score when compared with the control. Although none of the suture materials evaluated seemed clearly superior for use in Aplysia, we recommend silk because of its less robust granuloma induction, which is favorable in a clinical and research setting. PMID:20122319

  8. Gross and Histologic Evaluation of 5 Suture Materials in the Skin and Subcutaneous Tissue of the California Sea Hare (Aplysia californica)

    PubMed Central

    Anderson, Eric T; Davis, A Sally; Law, J McHugh; Lewbart, Gregory A; Christian, Larry S; Harms, Craig A

    2010-01-01

    Invertebrates are increasing in their importance to both the public and private aquarium trade and play a vital role in biomedical research. Surgical techniques have become an important approach to obtaining data and maintaining good health in both of these areas. However, studies examining tissue reaction to suture material in invertebrates are lacking. The current study evaluated the gross and histologic reaction of Aplysia californica to 5 commonly used suture materials, including polydioxanone, black braided silk, polyglactin 910, monofilament nylon, and monofilament poliglecaprone. Histologic samples were graded on the amount of edema (score, 1 to 4), inflammation (1 to 4), and granuloma formation (1 to 4) present, and a final overall histology score (1 to 6) was assigned to each sample. Compared with untreated control tissue, all suture materials caused significantly increased tissue reaction, but the overall histology score did not differ among the suture materials. Silk was the only suture that did not have a significantly increased granuloma score when compared with the control. Although none of the suture materials evaluated seemed clearly superior for use in Aplysia, we recommend silk because of its less robust granuloma induction, which is favorable in a clinical and research setting. PMID:20122319

  9. Abrasion resistance of two types of nonabsorbable braided suture

    Microsoft Academic Search

    Ian K. Y Lo; Stephen S Burkhart; Kyriacos Athanasiou

    2004-01-01

    Purpose: The purpose of this study was to compare the abrasion resistance of different types of non-absorbable braided sutures under varying in vitro conditions of cyclic loading. Type of Study: Biomechanical study. Methods: Two types of nonabsorbable braided sutures were used in this study, No. 2 Ethibond and No. 2 Fiberwire, combined with 5 different anchors: 5.0-mm Corkscrew anchor, 5.0-mm

  10. Suture-related pseudoinfection after total hip arthroplasty.

    PubMed

    Pierannunzii, Luca; Fossali, Andrea; De Lucia, Orazio; Guarino, Arturo

    2015-03-01

    Absorbable sutures are widely used for wound closure after total hip replacement. Here we present two cases of suture-related foreign-body reaction that perfectly mimicked a periprosthetic joint infection, with sterile abscess formation and physical and laboratory signs of inflammation acutely presenting 7-8 weeks after surgery, at the time of suture absorption. Both recurred with analogous timing after irrigation and debridement, likely due to re-using the same suture material. Multiple negative microbiological samples and positive histological samples showing a foreign-body reaction are the fundamental steps towards the diagnosis of a suture-related pseudoinfection (SRPI). Only three other cases have been reported to date, but the recurrence, together with the self-healing course after relapse, represents a completely novel feature and possibly the strongest demonstration of the supposed aetiopathogenesis. The knowledge of this possible complication leads to some clinical implications: all potential periprosthetic joint infections should routinely undergo not only microbiological but also histological sampling; caution should be used when recommending prosthesis exchange for potential infections occurring in the time range of suture absorption; lastly, if SRPI is suspected, a suture with low propensity to induce foreign-body reactions should be chosen after irrigation and debridement and the volume of absorbable material left in the wound should be as small as possible. PMID:24916148

  11. Investigation of microcirculatory changes in the duodenum of dogs caused by surgical suture materials.

    PubMed

    Petö, K; Nagy, A; Hauck, M; Mikó, I; Furka, I

    1997-01-01

    Surgical suture materials play an important role in the safe performance of surgical interventions. In our experiments we made an attempt to investigate what microcirculatory changes result from pulling the thread through the wall of the duodenum in Lembert stitches by including 3 kinds of absorbable and non-absorbable suture materials each (Catgut, Dexon, PDS, Silk, Ethibond, Ethilon). Research is still in the pre-experimental stage. In the long run, we hope to enrich the description of these suture materials by some new details. It could help prevent suture insufficiency, facilitate wound healing and thus, improved surgical safety. PMID:9408372

  12. In Vivo Strain in Cranial Sutures: The Zygomatic Arch

    PubMed Central

    Herring, Susan W.; Mucci, Robert J.

    2010-01-01

    Although cranial sutures presumably play a role in absorbing and/or transmitting loads applied to the skull, loading patterns on facial sutures are poorly understood. The zygomatic arch provides a comparatively isolated mechanical part of the skull containing a single suture, the zygomatico-squamosal. In pigs the zygomatico-squamosal suture has a short vertical segment located within the postorbital process and a longer horizontal segment which extends posteriorly. In anesthetized pigs single-element high-elongation strain gages were bonded over both segments of the suture. Strain was recorded during stimulation of the masseter muscles and while the lightly anesthetized animals masticated food pellets. The predominant strain patterns differed in the two segments of the suture. During mastication compressive strains predominated in the vertical segment, but tensile strains predominated in the horizontal segment. The same patterns were also produced by stimulation of the ipsilateral masseter muscle. Contraction of the contralateral masseter reversed the strain pattern, but strain levels were low and during mastication such reversals occurred only transiently. The two segments of the suture have contrasting morphologies. The vertical segment has broad, interdigitating contacts with fibers arranged in a compression-resisting orientation. The horizontal segment has a simple tongue and groove structure with fibers arranged to resist tension. Thus, the structure of the suture reflects the predominant strain pattern. PMID:1856873

  13. Combining in the melt physical and biological properties of poly(caprolactone) and chlorhexidine to obtain antimicrobial surgical monofilaments.

    PubMed

    Scaffaro, R; Botta, L; Sanfilippo, M; Gallo, G; Palazzolo, G; Puglia, A M

    2013-01-01

    Bacterial infections on a sutured wound represent a critical problem, and the preparation of suture threads possessing antimicrobial properties is valuable. In this work, poly(caprolactone) (PCL) monofilaments were compounded at the concentration of 1, 2 and 4 % (w/w), respectively, to the antiseptic chlorhexidine diacetate (CHX). The incorporation was carried out in the melt by a single-step methodology, i.e. "online" approach. Mechanical tests revealed that the incorporation of CHX does not significantly change tensile properties of PCL fibres as the thermal profile adopted to prepare the compounded fibres does not compromise the antibacterial activity of CHX. In fact, CHX confers to compounded PCL fibres' antimicrobial property even at the lowest CHX concentration as revealed by microbiological assays performed on Escherichia coli, Micrococcus luteus and Bacillus subtilis strains. The scanning electron microscope micrographs and energy-dispersive X-ray analysis of compounded threads revealed that CHX is uniformly distributed on fibre surface and that the overall amount of superficial CHX increases by increasing compounded CHX concentration. This distribution determines a biphasic CHX release kinetics characterized by an initial rapid solubilisation of superficial CHX micro-crystals, followed by a slow and gradual release of CHX incorporated in the bulk. Interestingly, the compounded threads did not show any toxic effect compromising cell viability of human fibroblasts in vitro, differently from that observed using an equal amount of pure CHX. Thus, this study originally demonstrated the effectiveness of an "online" approach to confer antimicrobial properties to an organic thermoplastic polymeric material commonly used for medical devices. PMID:22821439

  14. Comparative study of trabeculectomy using single sutures versus releasable sutures

    PubMed Central

    Matlach, Juliane; Hoffmann, Niels; Freiberg, Florentina J; Grehn, Franz; Klink, Thomas

    2012-01-01

    Background The purpose of this study was to compare the outcomes of trabeculectomy using single sutures or releasable sutures. Methods This retrospective study analyzed the medical records of 61 patients who had undergone trabeculectomy using single sutures (n = 33, 54.1%) or releasable sutures (n = 28, 45.9%). The scleral flap was secured with a mean 3.9 (range 3–5) single sutures in 33 patients and with three releasable sutures in 28 patients. Primary outcomes were the success rate, based on intraocular pressure and medication usage, and the frequency of complications and post-surgical interventions. The criteria used to determine complete success were, first, intraocular pressure < 18 mmHg and, second, ?21 mmHg and ?20% intraocular pressure reduction without glaucoma medication. Results All patients had an intraocular pressure ? 21 mmHg; 87.5% in the single suture group and 92.6% in the releasable suture group had an intraocular pressure < 18 mmHg at 24 months. There was a highly significant reduction in intraocular pressure to baseline values in both groups at the last visit. Applying the first criterion, complete success was achieved in 57.6% of patients with single sutures and 71.4% with releasable sutures, and based on the second criterion, 66.7% and 71.4%, respectively. No significant difference was found between the groups with regard to intraocular pressure, or success or complication rates. Conclusion The results of trabeculectomy using single sutures or releasable sutures are equivalent. Therefore, the choice of suture technique should be based on individual patient requirements and surgeon experience. PMID:22848142

  15. Optimizing the tissue anchoring performance of barbed sutures in skin and tendon tissues.

    PubMed

    Ingle, N P; King, M W

    2010-01-19

    The focus of the current work was to study how the geometric design of a single barbed monofilament suture effects its biomechanical behavior. Different cut angles and cut depths of barbs were prepared and tested in vitro for their tensile and tissue anchoring properties by means of a novel suture/tissue pullout test. Experiments were also performed using bovine tendon and porcine skin tissues. The experimental results revealed that since tendon tissue has a higher modulus than skin it needs a more rigid barb to penetrate and anchor the surrounding tissue. A cut angle of 150 degrees and a cut depth of 0.18 mm are therefore recommended. On the other hand, for the softer skin tissue, a cut angle of 170 degrees and a cut depth of 0.18 mm provides a more flexible barb that gives superior skin tissue anchoring. These findings confirm that the future development of barbed suture technology requires a detailed understanding of the biomechanical properties of the tissue in which they are to be used. This will lead to the future development of a range of tissue-specific barbed sutures. PMID:19883915

  16. Nonabsorbable-Suture-Induced Osteomyelitis: A Case Report and Review of the Literature

    PubMed Central

    Yeo, Cheng Hong; Russell, Nick C.; Sharpe, Tom

    2012-01-01

    We are reporting a case of nonabsorbable suture-induced osteomyelitis in patient who had an open rotator cuff repair with nonabsorbable Ethibond anchor suture. Patient in this case presented with very subtle clinical features of osteomyelitis of the left proximal humerus 15 years after initial rotator cuff repair surgery. Literature had shown that deep infection following rotator cuff repairs, although rare, can be easily missed and can cause severe complications. Absorbable suture had been demonstrated to be more superior, in terms of rate of deep infection, as compared to nonabsorbable suture when used in rotator cuff repair surgery. Both absorbable and nonabsorbable suture had been demonstrated to have similar mechanical properties by several different studies. The case demonstrated that initial presentation of deep infection can be subtle and easily missed by clinicians and leads to further complications. PMID:23259121

  17. Suture barb giant papillary conjunctivitis.

    PubMed

    Jolson, A S; Jolson, S C

    1984-02-01

    Giant papillary conjunctivitis can be due to an allergic reaction as in soft contact lens wearers and allergic palpebral conjunctivitis, or can result from a cut exposed suture end that abrades the upper palpebral conjunctiva. The syndrome of suture barb giant papillary conjunctivitis consists of a mucoid ocular discharge with blurred vision, a foreign body sensation, upper lid edema and blepharoptosis concomitant with giant papillae of the upper palpebral conjunctiva. Removal of the offending suture(s) results in resolution of the papillae and symptoms. PMID:6709289

  18. Optimizing reliability and sensitivity of Semmes-Weinstein monofilaments for establishing point tactile thresholds

    Microsoft Academic Search

    Elisabeth H. Tracey; Aaron J. Greene; Richard L. Doty

    Semmes-Weinstein monofilaments (SWM) are widely used to assess tactile point pressure sensitivity. However, the reliability of SWMs has been questioned, standardization of stimulus presentation procedures is lacking, and the sensitivity measure is commonly confounded by the response criterion. This study sought to assess the reliability of two versions of a forced-choice single staircase SWM test with the goal of optimizing

  19. Annealing of drawn monofilaments of liquid crystalline polymer vectra\\/vapor grown carbon fiber nanocomposites

    Microsoft Academic Search

    Estelle Kalfon-Cohen; Alessandro Pegoretti; Gad Marom

    2010-01-01

    The annealing treatment of drawn LCP nanocomposite monofilaments is discussed here. Upon annealing, an unstable structure is generated which presents a strong dependence on the annealing time sequence and temperature as observed by DSC. Moreover, it seems that increasing the draw down of the fiber restricts the formation of this new (unstable) structure. Based on dynamic mechanical analysis and on

  20. Computation of the permeability of textiles with experimental validation for monofilament

    E-print Network

    Sminchisescu, Cristian

    Computation of the permeability of textiles with experimental validation for monofilament and non.lomov@mtm.kuleuven.be Summary. For the manufacturing of composite materials with textile reinforce- ment, the permeability of the textile is a key characteristic. Using the law of Darcy, permeability can be derived from a numerical

  1. Terrane suturing, Mindoro, Philippines

    SciTech Connect

    Wynne, D.B.; McCabe, R.; Mazzullo, J.; Malicse, A.

    1985-01-01

    A middle to late Miocene suture zone (SZ) on Mindoro Island separates the older North Palawan Continental terrane (NPCT) (west) from the younger Central Philippine Arc Terrane (CPAT) (east). The SZ consists of mafic and ultramafic rocks and amphibolites thrust westward against slaty meta-sediments (NPCT). East of the SZ lies the East Mindoro Basin (EMB), separated from the SZ by the East Mindoro Fault Zone (EMFZ). Locally, topography and geology suggest normal motion on the EMFZ. However, in central Mindoro, topographic expression of the EMFZ is very diffuse and geologic map patterns are complex. Lithotectonic units and sequences are sometimes repeated and motion appears to have been multiphase. In the eastern central SZ, westerly thrust CPAT ( ) crystalline rocks are overlain by lower Pliocene shelfal limestone. This limestone contains both serpentinite pebbles and metamorphic, polcrystalline quartz grains near its base, thus constraining thrusting and terrane suturing to pre-Pliocene. 100 km NNW, at the town of Puerto Galera, the same relations are observed, although thrusting appears to have been SSW there. 100 km WNW of Puerto Galera, a northeast-dipping ophiolite on Ambil Island lies several km NE of slaty metasediments (NPCT ) on Luband Island. The authors suggest that these three ultramafic exposures represent western CPAT Basement, thrust westward against portions of the advancing NPCT.

  2. Barbed sutures in body surgery.

    PubMed

    Moya, Alexander P

    2013-09-01

    Wound-closing technology continues to evolve with the advent of barbed sutures, which appear to address some of the limitations of traditional sutures (numerous knots and time-consuming insertion, among other things). Advantages of knotless suture devices, specifically in body contouring, have been discussed in the literature over the past decade, with a recent increase over the past several years due to the US Food and Drug Administration (FDA) approval of unidirectional V-Loc (Covidien, Mansfield, Massachusetts) and bidirectional Quill (Angiotech Pharmaceuticals, Inc, Vancouver, British Columbia, Canada) barbed sutures for soft tissue approximation. A thorough review of the existing literature and evaluation of the author's personal experience are presented in this article. As with any new surgical device, a learning curve is present that needs to be overcome to realize the full benefits of utilizing barbed sutures in body surgery while minimizing their complications. PMID:24084880

  3. Comparison of the accuracy of monofilament testing at various points of feet in peripheral diabetic neuropathy screening

    PubMed Central

    2014-01-01

    Background Diabetic Peripheral Neuropathy is one of the most prevalent complications of diabetes mellitus. The development and progression of such complications are responsible for much of the morbidity and mortality. The purpose of this study was to evaluate the effectiveness of Semmes–Weinstein monofilament ten gram in 3, 4, eight and ten points in the screening of diabetic peripheral neuropathy in patients with diabetes mellitus. Methods In a descriptive correlational design, 150 patients with diabetes mellitus were selected using convenience sampling. All patients were evaluated for sensory neuropathy using ten gram Semmes-Weinstein Monofilaments and questionnaire on neuropathy symptoms. In the next phase, nerve conduction velocity was examined. The most common subjective symptoms were paresthesia of both feet, pain in feet, burning sensation in the extremities and numbness in the extremities. Results The results showed that the sensitivity of Monofilament in three and four points were 35.9 to 53.8 present and 38.5 to 51.3 percent respectively. Specificity of Monofilament the same points, were 73.9 to 84.7 and 73 to 87.4 percent respectively. Monofilament sensitivity at eight and ten points were 38.5 to 61.5 and 64.1 to 30.8 percent respectively. Also, specificity of the same points were 77.5 to 95.5 and 64 to 89.2 percent respectively. It was revealed that the difference sensitivity and specificity of Monofilament in three and four points with sensitivity and specificity in eight and ten point is not statistically significant. Conclusions This study showed that Semmes-Weinstein monofilament can easily use as a simple and inexpensive device for screening. Since increasing the number of points it was not significantly difference. Therefore, we suggest that screening for diabetic peripheral neuropathy, especially in large populations to avoid wasting time on Monofilament application, areas like three or four points eight and ten points could be used. PMID:24472435

  4. [Use of Nichrome suture material].

    PubMed

    Skobelkin, O K; Korotki?, I V; Tolstykh, P I; Korotki?, V I; Korotki?, V V; Gertsen, A V

    1990-06-01

    The suture material and the method of its application play an important role in the prevention of wound complications. With the use of Nichrome wire thread as the suture material in surgical interventions, the number of postoperative complications significantly was decreased. The Nichrome thread is also used expediently in operative interventions on patients with purulent diseases of the soft tissues, including cases after primary surgical treatment of purulent foci by carbon dioxide laser. PMID:2214555

  5. Kelp Gulls (Larus dominicanus) killed and injured by discarded monofilament lines at a marine recreational fishery in northern Patagonia.

    PubMed

    Yorio, Pablo; Marinao, Cristian; Suárez, Nicolás

    2014-08-15

    Among marine debris, monofilament fishing lines often result in negative impacts on marine organisms. We characterized marine debris and incidence of lost and discarded monofilament lines along beaches used by recreational fishers, and report the impact of lines on Kelp Gulls (Larus dominicanus) at the Bahía San Blas protected area, site of one of the main shore-based recreational fisheries of the southwestern Atlantic. Over 55% of the marine debris recorded originated from recreational fishing activities. Balls of tangled monofilament lines were found at a rate of 40.5 items per km. A total of 27 adult Kelp Gulls were found entangled with monofilament. All individuals were tangled to vegetation within colony boundaries. Four of the gulls had a monofilament line protruding from the bill, showing that they may be also killed when trying to obtain bait. Our results indicate that lost or discarded monofilament lines in the Bahía San Blas recreational fishing area result in undesired impacts on coastal wildlife. PMID:24951250

  6. [Experimental comparison of Maxon and chromic catgut in suturing of the urinary bladder].

    PubMed

    Osterhage, H R; Grün, B R; Judmann, G; Wünsch, H P

    1988-01-01

    The new monofile absorbable suture material Maxon was compared with Chromic catgut in bladder suturing in rabbits. Comparisons were made after 1, 2, 4, 8 and 12 weeks. The rate of stone formation was mainly determined by the suture technique used and not so much by the suture material. This was demonstrated by the low number of stones formed after using extramucosal suturing technique. Once a suture, be it Maxon or Chromic catgut, comes in contact with urine, concrements may form and the new monofile properties of Maxon do not offer any advantages here. On the other hand, Maxon does not enhance stone formation either. E. coli or Proteus infections did not influence formation of stones. The histological examinations showed Maxon to cause fewer inflammatory reactions. Sutures with Chromic catgut caused inflammation of the bladder wall, subsiding after 4 weeks. An existing urinary infection did not appear to influence the inflammatory process. Maxon offers an advantage over Chromic catgut in extramucosal sutures causing fewer inflammatory reactions. PMID:3284147

  7. The role of the sutures in biomechanical dynamic simulation of a macaque cranial finite element model: Implications for the evolution of craniofacial form

    PubMed Central

    Wang, Qian; Wood, Sarah A.; Grosse, Ian R.; Ross, Callum F.; Zapata, Uriel; Byron, Craig D.; Wright, Barth W.; Strait, David S.

    2012-01-01

    The global biomechanical impact of cranial sutures on the face and cranium during dynamic conditions is not well understood. It is hypothesized that sutures act as energy absorbers protecting skulls subjected to dynamic loads. This hypothesis predicts that sutures have a significant impact on global patterns of strain and cranial structural stiffness when analyzed using dynamic simulations; and that this global impact is influenced by suture material properties. In a finite element model developed from a juvenile Rhesus macaque cranium, five different sets of suture material properties for the zygomaticotemporal sutures were tested. The static and dynamic analyses produced similar results in terms of strain patterns and reaction forces, indicating that the zygomaticotemporal sutures have limited impact on global skull mechanics regardless of loading design. Contrary to the functional hypothesis tested here, the zygomaticotemporal sutures did not absorb significant amounts of energy during dynamic simulations regardless of loading speed. It is alternatively hypothesized that sutures are mechanically significant only insofar as they are weak points on the cranium that must be shielded from unduly high stresses so as not to disrupt vitally important growth processes. Thus, sutural and overall cranial form in some vertebrates may be optimized to minimize or otherwise modulate sutural stress and strain. PMID:22190334

  8. Effects of physical configuration and chemical structure of suture materials on bacterial adhesion. A possible link to wound infection.

    PubMed

    Chu, C C; Williams, D F

    1984-02-01

    The purpose of this study was to examine the effects of physical configuration and the chemical nature of suture materials on the preferential adherence of bacteria. Ten suture materials of 2-0 (chromic catgut, Dexon, Vicryl, PDS, Mersilene, Tycron, Ethibond, Surgilon, Ethilon, and Prolene) were used. The bacterial strains tested were Staph. aureus and E. coli. The level of bacterial adherence was determined quantitatively by radiolabelled cells and qualitatively by scanning electron microscopy. It was found that the amount of adhered bacteria depended on the type of suture material, the type of bacteria, and the duration of contact. In the group of absorbable sutures, the new PDS sutures exhibited the smallest affinity toward the adherence of both E. coli and Staph. aureus. Dexon sutures had the highest affinity toward these two bacteria. With nonabsorbable sutures, the physical configuration of the sutures contributed more to their ability to attract bacteria than the surface finish. The bacterial adherence on suture materials was also time dependent. Scanning electron microscope morphologic observation also indicated that Staph. aureus adhered on the suture surface in clusters whereas E. coli tended to adhere individually. PMID:6364858

  9. Models of cranial suture biology.

    PubMed

    Grova, Monica; Lo, David D; Montoro, Daniel; Hyun, Jeong S; Chung, Michael T; Wan, Derrick C; Longaker, Michael T

    2012-11-01

    Craniosynostosis is a common congenital defect caused by premature fusion of cranial sutures. The severe morphologic abnormalities and cognitive deficits resulting from craniosynostosis and the potential morbidity of surgical correction espouse the need for a deeper understanding of the complex etiology for this condition. Work in animal models for the past 20 years has been pivotal in advancing our understanding of normal suture biology and elucidating pathologic disease mechanisms. This article provides an overview of milestone studies in suture development, embryonic origins, and signaling mechanisms from an array of animal models including transgenic mice, rats, rabbits, fetal sheep, zebrafish, and frogs. This work contributes to an ongoing effort toward continued development of novel treatment strategies. PMID:23154351

  10. Usefulness of braided polyblend polyethylene suture material for flexor tendon repair in zone II by the side-locking loop technique.

    PubMed

    Ryoke, Koji; Uchio, Yuji; Yamagami, Nobuo; Kuwata, Suguru; Nozaki, Kenji; Yamamoto, Soichiro; Tsujimoto, Yumiko

    2014-01-01

    Flexor tendon injuries in zone II were treated in 14 fingers of 13 patients with our method. Firstly, a 2-strand core suture was made by the side-locking loop technique using a USP 2-0-sized braided polyblend polyethylene suture, then 7-strand peripheral cross-stitches were added using a USP 5-0-sized monofilament nylon suture. Post-operative exercises included passive flexion and extension without external fixation on the next day of surgery. Average follow-up observation period was 18 months. As results, the Strickland method of assessment for surgical outcome showed excellent in eight digits and good in five digits, though there was a poor outcome in one digit. Our suture method enabled early post-operative mobilisation exercise without using a splint, while preventing adhesion between the repaired tendon and peripheral tissues, which is considered to provide far greater ultimate tensile strength and a smaller gap at the sutured site than by the conventional method. PMID:24875521

  11. A kinetic and equilibrium analysis of silicon carbide chemical vapor deposition on monofilaments

    NASA Technical Reports Server (NTRS)

    Gokoglu, S. A.; Kuczmarski, M. A.

    1993-01-01

    Chemical kinetics of atmospheric pressure silicon carbide (SiC) chemical vapor deposition (CVD) from dilute silane and propane source gases in hydrogen is numerically analyzed in a cylindrical upflow reactor designed for CVD on monofilaments. The chemical composition of the SiC deposit is assessed both from the calculated total fluxes of carbon and silicon and from chemical equilibrium considerations for the prevailing temperatures and species concentrations at and along the filament surface. The effects of gas and surface chemistry on the evolution of major gas phase species are considered in the analysis.

  12. A numerical and experimental analysis of reactor performance and deposition rates for CVD on monofilaments

    NASA Technical Reports Server (NTRS)

    Gokoglu, S. A.; Kuczmarski, M.; Veitch, L.; Tsui, P.; Chait, A.

    1990-01-01

    The computational fluid dynamics (CFD) code FLUENT is adopted to simulate a cylindrical upflow reactor designed for chemical vapor deposition (CVD) on monofilaments. Equilibrium temperature profiles along the fiber and quartz reactor wall are experimentally measured and used as boundary conditions in numerical simulations. Two-dimensional axisymmetric flow and temperature fields are calculated for hydrogen and argon; the effect of free convection is assessed. The gas and surface chemistry is included for predicting silicon deposition from silane. The model predictions are compared with experimentally measured silicon CVD rates. Inferences are made for optimum conditions to obtain uniformity.

  13. Short- and long-term biomechanical and morphological study of new suture types in abdominal wall closure.

    PubMed

    Simón-Allué, R; Pérez-López, P; Sotomayor, S; Peña, E; Pascual, G; Bellón, J M; Calvo, B

    2014-09-01

    To perform an abdominal-wall closure, a continuous suture is the preferred method. The suture materials that are most commonly employed in abdominal surgery are polypropylene and polydioxanone. However, in recent times, new products have been marketed, such as non-absorbable polyurethane with elastic properties (Assuplus(®), Assut Europe, Italy) and absorbable barbed polydioxanone (Filbloc(®), Assut Europe, Italy). The purpose of this study was to compare the ability of those against the standard polypropylene (Surgipro(TM), Covidien, USA) and polydioxanone (Assufil(®), Assut Europe, Italy) to mimic the biomechanical behavior of the abdominal wall closure. Comparison of the sutures was made first with the materials alone and later in a laparotomy closure of a rabbit abdomen, used as an animal model. The biomechanical analysis consisted of uniaxial tensile tests of threads and sutured samples of the animal abdomen. In the latter case, results were analyzed at short- (21days) and long- (180days) term intervals after the surgery. The morphology studies and collagen expression of the samples were also investigated. The results determined that polydioxanone and polypropylene sutures showed a linear elastic behavior, with barbed polydioxanone as the most compliant suture and polyurethane as the stiffest. The sutured samples showed a statistically significant loss of resistance, measured as the load needed to perform a certain stretch, when compared with the corresponding control tissue. Analysis of the stress-stretch curves showed that elastic polyurethane was the only suture able to reproduce the mechanical behavior of healthy tissue in the short term, while the rest of the sutures remained less stiff. This coincides with the expression of type I collagen observed in this group at this point in the study. In the long term, there was no difference among the sutures, and none was able to mimic control behavior. PMID:24859461

  14. Neutron diffraction studies of the Zr/Nb effects on the Nb3Sn phase formation of monofilament wires

    E-print Network

    Paris-Sud XI, Université de

    the internal tin process. Titanium has been alloyed with Sn and shows an important increase of the Nb3SnNeutron diffraction studies of the Zr/Nb effects on the Nb3Sn phase formation of monofilament wires@grenoble.cnrs.fr, b zcharle@vip.sina.com, c sulpice@grenoble.cnrs.fr Keywords: Nb3Sn wire, superconducting materials

  15. Prediction of Chemical Vapor Deposition Rates on Monofilaments and Its Implications for Fiber Properties

    NASA Technical Reports Server (NTRS)

    Gokoglu, S. A.; Kuczmarski, M.; Veitch, L. C.

    1992-01-01

    Deposition rates are predicted in a cylindrical upflow reactor designed for chemical vapor deposition (CVD) on monofilaments. Deposition of silicon from silane in a hydrogen carrier gas is chosen as a relevant example. The effects of gas and surface chemistry are studied in a two-dimensional axisymmetric flow field for this chemically well-studied system. Model predictions are compared to experimental CVD rate measurements. The differences in some physical and chemical phenomena between such small diameter (about 150 microns) fiber substrates and other typical CVD substrates are highlighted. The influence of the Soret mass transport mechanism is determined to be extraordinarily significant. The difficulties associated with the accurate measurement and control of the fiber temperature are discussed. Model prediction sensitivities are investigated with respect to fiber temperatures, fiber radii, Soret transport, and chemical kinetic parameters. The implications of the predicted instantaneous rates are discussed relative to the desired fiber properties for both the batch and the continuous processes.

  16. The benefits of using barbed sutures with automated suturing devices in gynecologic endoscopic surgeries.

    PubMed

    Hart, Stuart; Sobolewski, Craig J

    2013-09-01

    Laparoscopic suturing and knot tying are some of the most difficult surgical skills to acquire, and are often times regarded as a rate-limiting step in the performance of advanced gynecologic endoscopic procedures. Automated suturing devices can significantly decrease the steep learning curve of this task but still require laparoscopic knot tying. Barbed sutures offer several advantages including rapid, consistent wound closure with even distribution of tension across the wound, the suture holds tension on its own, the need for knot tying with associated issues related to suture tensile strength and knot security is eliminated, and suturing time is decreased. Use of a barbed suture with an automated suturing device can offer many advantages to both the novice and the experienced surgeon, including increased efficiency, more uniform wound closure, and the ability to perform a laparoscopic continuous running stitch without the need for intracorporeal knot tying. PMID:24081852

  17. Effects of Suture Choice on Biomechanics and Physeal Status After Bioenhanced Anterior Cruciate Ligament Repair in Skeletally Immature Patients: A Large-Animal Study

    PubMed Central

    Vavken, Patrick; Proffen, Benedikt; Peterson, Chris; Fleming, Braden C.; Machan, Jason T.; Murray, Martha M.

    2012-01-01

    Purpose The objective of this study was to assess the effect of absorbable or nonabsorbable sutures in bioenhanced anterior cruciate ligament (ACL) repair in a skeletally immature pig model on suture tunnel and growth plate healing and biomechanical outcomes. Methods Sixteen female skeletally immature Yorkshire pigs were randomly allocated to receive unilateral, bioenhanced ACL repair with an absorbable (Vicryl) or nonabsorbable (Ethibond) suture augmented by an extracellular matrix-based scaffold (MIACH). After 15 weeks of healing, micro–computed tomography was used to measure residual tunnel diameters and growth plate status, and biomechanical outcomes were assessed. Results At 15 weeks postoperatively, there was a significant difference in tunnel diameter with significantly larger diameters in the nonabsorbable suture group (4.4 ± 0.3 mm; mean ± SD) than in the absorbable group (1.8 ± 0.5 mm; P <.001). The growth plate showed a significantly greater affected area in the nonabsorbable group (15.2 ± 3.4 mm2) than in the absorbable group (2.7 ± 0.8 mm2, P < .001). There was no significant difference in the linear stiffness of the repairs (29.0 ± 14.8 N/mm for absorbable v 43.3 ± 28.3 N/mm for nonabsorbable sutures, P = .531), but load to failure was higher in the nonabsorbable suture group (211 ± 121.5 N) than in the absorbable suture group (173 ± 101.4 N, P =.002). There was no difference between the 2 groups in anteroposterior laxity at 30° (P = .5117), 60° (P = .3150), and 90° (P = .4297) of knee flexion. Conclusions The use of absorbable sutures for ACL repair resulted in decreased physeal plate damage after 15 weeks of healing; however, use of nonabsorbable sutures resulted in 20% stronger repairs. Clinical Relevance Choice of suture type for ACL repair or repair of tibial avulsion fractures may depend on patient skeletal age and size, with absorbable sutures preferred in very young, small patients at higher risk with physeal damage and nonabsorbable sutures preferred in larger, prepubescent patients who may place higher loads on the repair. PMID:23200845

  18. 21 CFR 878.5020 - Nonabsorbable polyamide surgical suture.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...878.5020 Nonabsorbable polyamide surgical suture. (a) Identification. Nonabsorbable polyamide surgical suture is a nonabsorbable...polymers Nylon 6 and Nylon 6,6 and is indicated for use in soft tissue approximation. The polyamide surgical suture...

  19. Enhanced Cosmetic Outcome with Running Horizontal Mattress Sutures

    E-print Network

    McCarthy, John E.

    Enhanced Cosmetic Outcome with Running Horizontal Mattress Sutures BRENT R. MOODY, MD, JOHN E good wound eversion, firm closure, and cosmetically elegant results. Simple running sutures. OBJECTIVE. We compared the cosmetic results of simple running nonabsorbable sutures with running horizontal

  20. 21 CFR 870.3460 - Endovascular Suturing System.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES CARDIOVASCULAR DEVICES Cardiovascular Prosthetic Devices § 870.3460 Endovascular Suturing System. (a) Identification. An endovascular suturing system...

  1. 21 CFR 870.3460 - Endovascular Suturing System.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES CARDIOVASCULAR DEVICES Cardiovascular Prosthetic Devices § 870.3460 Endovascular Suturing System. (a) Identification. An endovascular suturing system...

  2. Did you choose the right suture material for skin closure in elective caesarean section?

    PubMed

    Naskar, Tapan Kumar; Chakraborty, Somajita; Mukhopadhyay, Sima; Agnes, Charang; Majumdar, Palash

    2012-09-01

    Surgical incision should heal with first intension with minimum deformity. Pain perception during postoperative period (short term) and appreciation of scar (long term) are two key components assessed by patients after a caesarean section. The present study compares these parameters using absorbable and non-absorbable material for skin closure using subcuticular stitch. The study shows a significant difference in pain perception on 1st postoperative week along with shorter duration of hospital stay and patients appreciation of scar quality on long term are significantly better in absorbable suture group. PMID:23741838

  3. Microfabrication of fine electron beam tunnels using UV-LIGA and embedded polymer monofilaments for vacuum electron devices

    NASA Astrophysics Data System (ADS)

    Joye, Colin D.; Calame, Jeffrey P.; Nguyen, Khanh T.; Garven, Morag

    2012-01-01

    Vacuum electron devices require electron beams to be transported through hollow channels that pass through an electromagnetic slow-wave circuit. These electron 'beam tunnels' are shrinking toward sizes smaller than traditional techniques can manage as the operating frequencies push toward the THz. A novel technique is described and experimentally demonstrated that uses polymer monofilaments of arbitrary cross-sectional shape combined with ultraviolet photolithography (UV-LIGA) of SU-8 photoresists. This combination of monofilaments and SU-8 structures comprises a 3D mold around which copper is electroformed to produce high-quality beam tunnels of arbitrary length and size along with the electromagnetic circuits. True round beam tunnels needed for upper-millimeter wave and THz vacuum electron devices can now be fabricated in a single UV-LIGA step. These techniques are also relevant to microfluidic devices and other applications requiring very small, straight channels with aspect ratios of several hundred or more.

  4. The double loop mattress suture

    PubMed Central

    Biddlestone, John; Samuel, Madan; Creagh, Terry; Ahmad, Tariq

    2014-01-01

    An interrupted stitch type with favorable tissue characteristics will reduce local wound complications. We describe a novel high-strength, low-tension repair for the interrupted closure of skin, cartilage, and muscle, the double loop mattress stitch, and compare it experimentally with other interrupted closure methods. The performance of the double loop mattress technique in porcine cartilage and skeletal muscle is compared with the simple, mattress, and loop mattress interrupted sutures in both a novel porcine loading chamber and mechanical model. Wound apposition is assessed by electron microscopy. The performance of the double loop mattress in vivo was confirmed using a series of 805 pediatric laparotomies/laparoscopies. The double loop mattress suture is 3.5 times stronger than the loop mattress in muscle and 1.6 times stronger in cartilage (p ? 0.001). Additionally, the double loop mattress reduces tissue tension by 66% compared with just 53% for the loop mattress (p ? 0.001). Wound gapping is equal, and wound eversion appears significantly improved (p ? 0.001) compared with the loop mattress in vitro. In vivo, the double loop mattress performs as well as the loop mattress and significantly better than the mattress stitch in assessments of wound eversion and dehiscence. There were no episodes of stitch extrusion in our series of patients. The mechanical advantage of its intrinsic pulley arrangement gives the double loop mattress its favorable properties. Wound dehiscence is reduced because this stitch type is stronger and exerts less tension on the tissue than the mattress stitch. We advocate the use of this novel stitch wherever a high-strength, low-tension repair is required. These properties will enhance wound repair, and its application will be useful to surgeons of all disciplines. PMID:24698436

  5. Load to failure of common meniscal repair techniques: effects of suture technique and suture material.

    PubMed

    Post, W R; Akers, S R; Kish, V

    1997-12-01

    Success of meniscal repair with early or immediate motion depends on the ability of the suture fixation to withstand the loads applied. Vertical and horizontal mattress suture techniques were tested using 2-0 Ethibond, and 0-PDS and 1-PDS sutures (Ethicon, Somerville, NJ). Mulberry knot technique was tested with 0-PDS and 1-PDS sutures. Twenty menisci (60 sutures) were tested for each suture material. Sutures were placed 3 to 4 mm from the peripheral edge of the meniscus with double barreled cannulas for vertical and horizontal mattress techniques or a spinal needle for the mulberry knot technique, reproducing clinical techniques of meniscal repair. Mechanical testing of suture fixation was performed to failure at a rate of 10 mm/min on a MTS material testing system (MTS Systems Corp, Minneapolis, MN). Suture pullouts were reported as the load displacement to failure from the inner fragment only, because clinical failure would ensue should a suture pull through the inner fragment of a tear. Vertical mattress technique with 1-PDS suture had significantly greater load to failure than any other combination (P < .05). Analysis of variance showed that the vertical mattress technique had statistically superior pullout strength (P < .0001) compared with the horizontal mattress and mulberry knot techniques, which were statistically similar. There were significant differences (P < .0001) between suture types, with 1-PDS proving best compared with 0-PDS, which was stronger than 2-0 Ethibond. Selection of suture material had the greatest impact on vertical mattress load to failure and was not important to the strength of the other techniques. PMID:9442327

  6. Radiofrequency and its effect on suture strength.

    PubMed

    Shah, Anup A; Kang, Parminder; Deutsch, Allen

    2009-12-01

    The use of radiofrequency-based electrocautery for hemostasis and ablation within the subacromial space and glenohumeral joint can cause damage to suture material. Prior studies have focused on the mechanical properties of sutures including their ability to withstand abrasion. The purpose of this study was to determine the effect of electrical energy on the mechanical properties of 5 different brands of #2 suture used for arthroscopic shoulder repair: FiberWire (Arthrex Inc, Naples, Florida); Orthocord (DePuy Mitek, Norwood, Massachusetts); Hi-Fi (formally Herculine; Linvatec Corp, Largo, Florida); MaxBraid (Teleflex Medical, Research Triangle Park, North Carolina); and Ethibond (Ethicon, Inc, Somerville, New Jersey). A matched pair of human deltoid muscle submerged in buffered saline solution (pH 7.4) was used as a test medium. The suture strengths were tested in 3 different scenarios. The 3 groups were as follows: control group without electrical current, coagulation group with direct introduction of electrical current on a coagulate setting for 2 seconds, and a cutting group with direct introduction of electrical current on a cut setting for 2 seconds. Hi-Fi suture seemed to be the least susceptible to damage by direct electrocautery application. Orthocord suffered the greatest loss of strength of all materials tested. This study demonstrates that exposure to electrocautery damages and weakens suture. Great care should be taken when electrocautery is used during arthroscopic repairs to prevent suture failure and preserve repair integrity. PMID:19968222

  7. Miniscrew Assisted Slow Expansion of Mature Sutures

    E-print Network

    Pulver, Ross

    2014-04-28

    , rather than dental changes. With the use of MSI’s, it is possible that decreasing the force level will allow for the necessary remodeling of sutural interdigitations to take place and promote sutural expansion. The purpose of the present project... the device, which he interpreted as separation of the maxilla at the midpalatal suture. At the time this caused a great deal of controversy among his colleagues and there was a long period of 3 time where the dental profession in the United States did...

  8. [Manual suture versus/or mechanical suture from the Austrian viewpoint].

    PubMed

    Kronberger, L; Germann, R

    1987-01-01

    A general inquiry was made at surgical units and university clinics in Austria about the anastomosis techniques used between 1980 to 1985. The result was that in 90.3% the suture was made by hand and in 9.7% by machine. The first mentioned was performed as double row inverting suture by 66% of our surgeons, and only in 30% as an all-layer suture. The stapler-technique was mostly preferred for the oesophago-jejunostomy and the high and lower resection of the rectum. A leakage of the suture line was observed in 3.9% after sewing by hand and in 6.3% after stapling. The total lethality finally was 1.4% for hand made suture and 1.8% for apparative suture. PMID:3323741

  9. Bordered Legendrian knots and sutured Legendrian invariants

    E-print Network

    Sivek, Steven (Steven W.)

    2011-01-01

    In this thesis we apply techniques from the bordered and sutured variants of Floer homology to study Legendrian knots. First, given a front diagram for a Legendrian knot K in S? which has been split into several pieces, ...

  10. Metopic sutural closure in the human skull.

    PubMed Central

    Manzanares, M C; Goret-Nicaise, M; Dhem, A

    1988-01-01

    The present study reveals the presence in the sutural area of secondary cartilage, assuring the passive growth of the bones and undergoing an endochondral ossification, but without playing a direct role in the synostosis. The chondroid tissue is responsible for the growth of each frontal bone towards the other and constitutes the first bridge of union between the two bones. It is the most important finding in this study, which provides a description of the closure of the metopic suture and of the maintenance of an open sutural space by a process of active resorption. This new knowledge will help to understand better the whole process of suture closure and its pathology. Images Fig. 1 Fig. 2 Fig. 5 Fig. 6 Fig. 8 Fig. 9 PMID:3254893

  11. Absorbable implants for open shoulder stabilization

    Microsoft Academic Search

    Lennart Magnusson; Lars Ejerhed; Lars Rostgård; Ninni Sernert; Jüri Kartus

    2006-01-01

    Eighteen consecutive patients who had recurrent, unidirectional, post-traumatic shoulder instability were included. All these patients underwent surgery using an open Bankart technique involving absorbable suture anchors. The median age at the index operation was 27 (16–50) years. One subluxation and two re-dislocations occurred during the follow-up period of 90 (80–95) months. At the 90-month control, the Rowe and Constant scores

  12. Absorb & Repel

    NSDL National Science Digital Library

    Kohl Children's Museum

    2012-01-01

    In this activity, learners investigate how different materials repel or absorb water. Learners use spray bottles to explore how everyday items like sponges, cardboard, feathers, etc. respond to water differently. This activity also introduces learners to the scientific method as learners make predictions about which materials will absorb or repel water.

  13. Lens aberrations and their relationship with lens sutures for species with Y-suture branches

    NASA Astrophysics Data System (ADS)

    Gargallo, Ana; Arines, Justo; Acosta, Eva

    2013-02-01

    Work remains to be done to understand the origins of ocular aberrations. We analyze lens aberrations of several species with Y-suture branches (bovine, ovine, and porcine) and their relationship with suture distribution. Aberrations are measured in vitro with a point diffraction interferometer in 10 different eyes of each species. The minimum number of Zernike polynomials minimizing the root mean square error of the wavefront is estimated by processing the interferograms. Through this we find significant amounts of astigmatism, coma, spherical aberration, and trefoil in the lenses of the three species. Moreover, we observe a high degree of correlation between the orientation of the lens sutures and the axis of nonrotationally symmetric aberrations. Our results point to lens sutures as the histological origin of the most significant lens aberrations: astigmatism, coma, and trefoil, but we are unable to find a major suture governing all the axes.

  14. Craniofacial Sutures: Morphology, Growth, and In Vivo Masticatory Strains

    PubMed Central

    RAFFERTY, KATHERINE L.; HERRING, SUSAN W.

    2010-01-01

    The growth and morphology of craniofacial sutures are thought to reflect their functional environment. However, little is known about in vivo sutural mechanics. The present study investigates the strains experienced by the internasal, nasofrontal, and anterior interfrontal sutures during masticatory activity in 4–6-month-old miniature swine (Sus scrofa). Measurements of the bony/fibrous arrangements and growth rates of these sutures were then examined in the context of their mechanical environment. Large tensile strains were measured in the interfrontal suture (1,036 ?? ± 400 SD), whereas the posterior internasal suture was under moderate compression (?440 ?? ± 238) and the nasofrontal suture experienced large compression (?1,583 ?? ± 506). Sutural interdigitation was associated with compressive strain. The collagen fibers of the internasal and interfrontal sutures were clearly arranged to resist compression and tension, respectively, whereas those of the nasofrontal suture could not be readily characterized as either compression or tension resisting. The average linear rate of growth over a 1-week period at the nasofrontal suture (133.8 ?m, ± 50.9 S.D) was significantly greater than that of both the internasal and interfrontal sutures (39.2 ?m ± 11.4 and 65.5 ?m ± 14.0, respectively). Histological observations suggest that the nasofrontal suture contains chondroid tissue, which may explain the unexpected combination of high compressive loading and rapid growth in this suture. PMID:10521876

  15. Fourier technique for studying ammonoid sutures

    SciTech Connect

    Gildner, R.F.; Ackerly, S.C.

    1985-01-01

    Suture patterns have long been recognized as being of primary importance in the study of ammonoids. The authors have developed a technique to use Fourier analysis to study these structures by using a simple transformation: x-y data of a digitized suture are transformed to angle of slope versus position along the suture's length. A Fast Fourier Transform applied to the data produces a power spectrum (amplitude versus wave number) providing a precise and accurate measure of suture shape. The authors have applied this technique to the analysis of ontogenetic change in suture morphology. In goniatitic, ceratitic and preadult ammonitic patterns most of the change is exhibited in the amplitudes of the lowest ten wave numbers. Their Fourier coefficients clearly show trends not readily apparent by visual inspection. The more complex ammonitic patterns are reflected in increased amplitudes of higher wave numbers (a broader peak of the power spectrum) and their analysis is necessarily more complex. The Fourier approach presents the opportunity to quantitatively measure and describe the tempo and mode of evolution in the Ammonoidea. Potential applications of the new technique, as well as limitations, are discussed with special attention to investigations of ammonoid ontogeny and phylogeny.

  16. [One-row suture in construction of biliodigestive anastomoses].

    PubMed

    Drobot, V T

    1976-03-01

    An experience with the construction of 138 anastomoses between the external bile ducts and the duodenum is analysed. The anastomoses were constructed in 47 patients with two-raw and in 91--with one-raw sutures. A partial nonhermeticity of the suture line was observed as seldom both in cases with one-raw and two-raw sutures. In constructing anastomoses one-raw suture is felt to be more preferable, since the formation of stoma with a one-raw suture is felt to be more preferable, since the formation of stoma with a one-raw suture simplifies the procedure. PMID:775744

  17. Modality of wound closure after total knee replacement: are staples as safe as sutures? A retrospective study of 181 patients

    PubMed Central

    2011-01-01

    Background Surgical site wound closure plays a vital role in post-operative success. This effect is magnified in regard to commonly performed elective procedures such as total knee arthroplasty. The use of either sutures or staples for skin re-approximation remains a contested subject, which may have a significant impact on both patient safety and surgical outcome. The literature remains divided on this topic. Methods Two cohorts of patients at a level one trauma and regional referral center were reviewed. Cohorts consisted of consecutive total knee arthroplasties performed by two surgeons who achieved surgical wound re-approximation by either staples or absorbable subcuticular sutures. Outcome variables included time of surgery, wound dehiscence, surgical site infection per Center for Disease Control criteria and repeat procedures for debridement and re-closure. Results 181 patients qualified for study inclusion. Staples were employed in 82 cases (45.3% of total) and sutures in 99 cases (54.7%). The staples group had no complications while the sutures group had 9 (9.1%). These consisted of: 4 infections (2 superficial, one deep, one organ/space); three patients required re-suturing for dehiscence; one allergic type reaction to suture material; and one gout flare resulting in dehiscence. The mean surgical time with sutures was 122.3 minutes (sd = 33.4) and with staples was 114 minutes (sd = 24.4). Conclusion This study demonstrated significantly fewer complications with staple use than with suture use. While all complications found in this study cannot be directly attributed to skin re-approximation method, the need for further prospective, randomized trials is established. PMID:22011354

  18. Double suture technique to delineate PASTA lesions.

    PubMed

    Sperling, John W; Dahm, Diane L

    2006-06-01

    A common method of treating PASTA (partial articular surface tendon avulsion) lesions involves completing the tear followed by arthroscopic repair. Frequently, the boundaries of the tear are difficult to determine from the bursal side with the use of a single marking stitch. Therefore, we describe a simple technique that allows the surgeon to reproducibly define the boundaries of the partial tear. Following a standard arthroscopic examination of the articular portion of the shoulder joint, the PASTA lesion is identified. A spinal needle is introduced and the most anterior and posterior aspects of the tear are marked by passing 2 sutures. Following a bursectomy, the 2 sutures that clearly define the boundaries of the tear are identified. The tear is then completed by "connecting the dots" outlined by the sutures and an arthroscopic repair is performed in the standard manner. PMID:16762713

  19. Patella Fracture Fixation with Suture and Wire: you Reap what you Sew

    PubMed Central

    Egol, Kenneth; Howard, Daniel; Monroy, Alexa; Crespo, Alexander; Tejwani, Nirmal; Davidovitch, Roy

    2014-01-01

    Introduction Operative fixation of displaced inferior pole patella fractures has now become the standard of care. This study aims to quantify clinical, radiographic and functional outcomes, as well as identify complications in a cohort of patients treated with non-absorbable braided suture fixation for inferior pole patellar fractures. These patients were then compared to a control group of patients treated for mid-pole fractures with K-wires or cannulated screws with tension band wiring. Methods In this IRB approved study, we identified a cohort of patients who were diagnosed and treated surgically for a displaced patella fracture. Demographic, injury, and surgical information were recorded. All patients were treated with a standard surgical technique utilizing non-absorbable braided suture woven through the patellar tendon and placed through drill holes to achieve reduction and fracture fixation. All patients were treated with a similar post-operative protocol and followed up at standard intervals. Data were collected concurrently at follow up visits. For purpose of comparison, we identified a control cohort with middle third patella fractures treated with either k-wires or cannulated screws and tension band technique. Patients were followed by the treating surgeon at regular follow-up intervals. Outcomes included self-reported function and knee range of motion compared to the uninjured side. Results Forty-nine patients with 49 patella fractures identified retrospectively were treated over 9 years. This cohort consisted of 31 females (63.3%) and 18 males (36.7%) with an average age of 57.1 years (range 26 - 88 years). Patients had an average BMI of 26.48 (range 19 - 44.08). Thirteen patients with inferior pole fractures underwent suture fixation and 36 patients with mid-pole fractures underwent tension band fixation (K-wire or cannulated screws with tension band). In the suture cohort, one fracture failed open repair (7.6%), which was revised again with sutures and progressed to union. Of the 36 fractures repaired with a tension band fixation, 11 underwent secondary surgery due to hardware pain or fixation failure (30.6%). At one year, no difference was seen in knee range of motion between cohorts. All fractures healed radiographically. Those patients who required reoperation or removal of hardware had significantly diminished range of motion about their injured knee (p > 0.005). Conclusions Patients who sustain inferior pole patella fractures have limited options for fracture fixation. Suture repair is clinically acceptable, yielding similar results to patella fractures repaired with metal implants. Importantly, patients undergoing suture repair appear to have fewer hardware related postoperative complications than those receiving wire fixation for midpole fractures. PMID:25328461

  20. Optimal Suturing Technique and Number of Sutures for Surgical Implantation of Acoustic Transmitters in Juvenile Salmonids

    SciTech Connect

    Deters, Katherine A.; Brown, Richard S.; Boyd, James W.; Eppard, M. B.; Seaburg, Adam

    2012-01-02

    The size reduction of acoustic transmitters has led to a reduction in the length of incision needed to implant a transmitter. Smaller suture knot profiles and fewer sutures may be adequate for closing an incision used to surgically implant an acoustic microtransmitter. As a result, faster surgery times and reduced tissue trauma could lead to increased survival and decreased infection for implanted fish. The objective of this study was to assess the effects of five suturing techniques on mortality, tag and suture retention, incision openness, ulceration, and redness in juvenile Chinook salmon Oncorhynchus tshawytscha implanted with acoustic microtransmitters. Suturing was performed by three surgeons, and study fish were held at two water temperatures (12°C and 17°C). Mortality was low and tag retention was high for all treatments on all examination days (7, 14, 21, and 28 days post-surgery). Because there was surgeon variation in suture retention among treatments, further analyses included only the one surgeon who received feedback training in all suturing techniques. Incision openness and tissue redness did not differ among treatments. The only difference observed among treatments was in tissue ulceration. Incisions closed with a horizontal mattress pattern had more ulceration than other treatments among fish held for 28 days at 17°C. Results from this study suggest that one simple interrupted 1 × 1 × 1 × 1 suture is adequate for closing incisions on fish under most circumstances. However, in dynamic environments, two simple interrupted 1 × 1 × 1 × 1 sutures should provide adequate incision closure. Reducing bias in survival and behavior tagging studies is important when making comparisons to the migrating salmon population. Therefore, by minimizing the effects of tagging on juvenile salmon (reduced tissue trauma and reduced surgery time), researchers can more accurately estimate survival and behavior.

  1. 21 CFR 878.4930 - Suture retention device.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GENERAL AND PLASTIC SURGERY DEVICES Surgical Devices § 878.4930 Suture retention device. (a) Identification. A suture...

  2. 21 CFR 878.4930 - Suture retention device.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ... FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GENERAL AND PLASTIC SURGERY DEVICES Surgical Devices § 878.4930 Suture retention device. (a) Identification. A suture retention...

  3. 21 CFR 878.4930 - Suture retention device.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ... FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GENERAL AND PLASTIC SURGERY DEVICES Surgical Devices § 878.4930 Suture retention device. (a) Identification. A suture retention...

  4. 21 CFR 878.4930 - Suture retention device.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ... FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GENERAL AND PLASTIC SURGERY DEVICES Surgical Devices § 878.4930 Suture retention device. (a) Identification. A suture retention...

  5. 21 CFR 878.4930 - Suture retention device.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ... FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GENERAL AND PLASTIC SURGERY DEVICES Surgical Devices § 878.4930 Suture retention device. (a) Identification. A suture retention...

  6. Optimal Patterns for Suturing Wounds H. R. Chaudhry

    E-print Network

    Bukiet, Bruce

    REVISION Optimal Patterns for Suturing Wounds H. R. Chaudhry UMDNJ ­ Department of Physical at Stratford Stratford, NJ 08084 1 #12; Optimal Patterns for Suturing Wounds H. R. Chaudhry 1; 2 B. Bukiet 2 M stresses in sutured human skin wounds is presented. The model uses the incremental law of elasticity

  7. Recycling Suture Limbs from Knotless Suture Anchors for Arthroscopic Shoulder Stabilization

    PubMed Central

    Johnson, Timothy S.; DiPompeo, Christine M.; Ismaeli, Zahra C.; Porter, Polly A.; Nicholson, Shannon L.; Johnson, David C.

    2014-01-01

    Recurrent shoulder instability often leads to labral abnormality that requires surgical intervention that may require fixation with suture anchors. The proposed surgical technique allows the surgeon to achieve 2 points of fixation around the labrum and/or capsule with a single suture secured to the glenoid with a knotless anchor. Instead of cutting and discarding the residual suture limbs after anchor insertion, this technique uses the residual suture limbs of the knotless anchor for a second suture pass. This technique (1) creates a more cost- and time-efficient surgical procedure than using multiple single-loaded anchors or double-loaded anchors, (2) decreases the known risk of glenoid fracture from the stress riser at the implant tips of multi-anchor repairs by reducing the number of anchors required for stabilization, (3) decreases the surgical time compared with the use of double-loaded anchors through simpler suture management and less knot tying, (4) allows for the secure reapproximation of the labrum to the glenoid while offering a convenient option for capsulorrhaphy without the need to insert another anchor, and (5) yields more points of soft-tissue fixation with fewer anchors drilled into the glenoid. PMID:25126504

  8. Flexor tendon healing within the tendon sheath using bioabsorbable poly-L/D-lactide 96/4 suture. A histological in vivo study with rabbits.

    PubMed

    Viinikainen, Anna; Göransson, Harry; Taskinen, Hanna-Stina; Röyttä, Matias; Kellomäki, Minna; Törmälä, Pertti; Rokkanen, Pentti

    2014-05-01

    The bioabsorbable poly-L/D-lactide (PLDLA) 96/4 suture has good biomechanical and knot properties, and sufficient tensile strength half-life for flexor tendon repair. In the present study, the biocompatibility of PLDLA suture was compared with that of coated braided polyester suture in the rabbit flexor digitorum profundus tendon repaired within the tendon sheath. Postoperative unrestricted active mobilization was allowed. The tendons were studied histologically after 1-, 3-, 6-, 12-, 26-, and 52-week follow-ups. No differences were found in the biocompatibility between the suture materials, with only scattered multinuclear giant cells near the sutures in both groups from 6 weeks onwards. At 52 weeks, most of the PLDLA material was absorbed and the histological structure of the tendon appeared normal, whereas in the polyester repairs the suture knots filled the repair site, causing bulking of the tendon surface, and the collagen alignment appeared disoriented. The results suggest that the PLDLA 96/4 is a suitable suture material for flexor tendon repair. PMID:24477875

  9. Sound Absorbers

    NASA Astrophysics Data System (ADS)

    Fuchs, H. V.; Möser, M.

    Sound absorption indicates the transformation of sound energy into heat. It is, for instance, employed to design the acoustics in rooms. The noise emitted by machinery and plants shall be reduced before arriving at a workplace; auditoria such as lecture rooms or concert halls require a certain reverberation time. Such design goals are realised by installing absorbing components at the walls with well-defined absorption characteristics, which are adjusted for corresponding demands. Sound absorbers also play an important role in acoustic capsules, ducts and screens to avoid sound immission from noise intensive environments into the neighbourhood.

  10. Threshold for detection of diabetic peripheral sensory neuropathy using a range of research grade monofilaments in persons with Type 2 diabetes mellitus

    Microsoft Academic Search

    Mary P Thomson; Julia Potter; Paul M Finch; Richard B Paisey

    2008-01-01

    AIMS: To identify the threshold of reduced sensory perception in Type 2 diabetes mellitus (Type 2 DM) using a range of research grade monofilaments. METHODS: Three groups of participants were recruited into a between subject, cross-sectional study. Group 1(NEW), persons with Type 2 DM diagnosed for less than 2 years (n = 80); Group 2 (EST) persons with Type 2

  11. Transfascial suture in laparoscopic ventral hernia repair; friend or foe?

    PubMed

    Sahu, Diwakar; Das, Somak; Wani, Majid Rasool; Reddy, Prasanna Kumar

    2015-01-01

    'Suture hernia' is fairly a new and rare type of ventral hernia. It occurs at the site of transfascial suture, following laparoscopic ventral hernia repair (LVHR). Employment of transfascial sutures in LVHR is still debatable in contrast to tackers. Prevention of mesh migration and significant post-operative pain are the pros and cons with the use of transfascial sutures, respectively. We report an unusual case of suture hernia or transfascial hernia, which can further intensify this dispute, but at the same time will provide insight for future consensus. PMID:25883460

  12. Carbon dioxide laser-assisted nerve repair: effect of solder and suture material on nerve regeneration in rat sciatic nerve.

    PubMed

    Menovsky, Tomas; Beek, Johan F

    2003-01-01

    In order to further improve and explore the role of lasers for nerve reconstruction, this study was designed to investigate regeneration of sharply transected peripheral nerves repaired with a CO(2) milliwatt laser in combination with three different suture materials and a bovine albumin protein solder as an adjunct to the welding process. Unilateral sciatic nerve repair was performed in 44 rats. In the laser group, nerves were gently apposed, and two stay sutures (10-0 nylon, 10-0 polyglycolic acid, or 25 microm stainless steel) were placed epi/perineurially. Thereafter, the repair site was fused at 100 mW with pulses of 1.0 s. In the subgroup of laser-assisted nerve repair (LANR), albumen was used as a soldering agent to further reinforce the repair site. The control group consisted of nerves repaired by conventional microsurgical suture repair (CMSR), using 4-6 10-0 nylon sutures. Evaluation was performed at 1 and 6 weeks after surgery, and included qualitative and semiquantitative light microscopy. LANR performed with a protein solder results in a good early peripheral nerve regeneration, with an optimal alignment of nerve fibers and minimal connective tissue proliferation at the repair site. All three suture materials produced a foreign body reaction; the least severe was with polyglycolic acid sutures. CMSR resulted in more pronounced foreign-body granulomas at the repair site, with more connective-tissue proliferation and axonal misalignment. Furthermore, axonal regeneration in the distal nerve segment was better in the laser groups. Based on these results, CO(2) laser-assisted nerve repair with soldering in combination with absorbable sutures has the potential of allowing healing to occur with the least foreign-body reaction at the repair site. Further experiments using this combination are in progress. PMID:12740882

  13. Development of manufacturing process for large-diameter composite monofilaments by pyrolysis of resin-impregnated carbon-fiber bundles

    NASA Technical Reports Server (NTRS)

    Bradshaw, W. G.; Pinoli, P. C.; Vidoz, A. E.

    1972-01-01

    Large diameter, carbon-carbon composite, monofilaments were produced from the pyrolysis of organic precursor resins reinforced with high-strenght carbon fibers. The mechanical properties were measured before and after pyrolysis and the results were correlated with the properties of the constituents. The composite resulting from the combination of Thornel 75 and GW-173 resin precursor produced the highest tensile strength. The importance of matching strain-to-failure of fibers and matrix to obtain all the potential reinforcement of fibers is discussed. Methods are described to reduce, within the carbonaceous matrix, pyrolysis flaws which tend to reduce the composite strength. Preliminary studies are described which demonstrated the feasibility of fiber-matrix copyrolysis to alleviate matrix cracking and provide an improved matrix-fiber interfacial bonding.

  14. An Augmentation Suture Technique for Arthroscopic Rotator Cuff Repair

    PubMed Central

    Omae, Hiromichi; Yamamoto, Susumu; Mochizuki, Yu; Ochi, Mitsuo

    2014-01-01

    The double-row suture technique and the suture-bridge technique have been used for rotator cuff repair to decrease the occurrence of retears. However, when only the degenerated tendon end is sutured, the risk of retear remains. The augmentation suture technique is a new procedure that connects the intact medial tendon to the lateral greater tuberosity, and this approach may protect the initial repair site. The procedures for this technique are as follows: 2 sutures are placed through the medial intact tendon, the cuff tear is repaired by the single-row technique, 2 sutures are pulled laterally over the single-row repair site, and 2 sutures are fixed at the lateral greater tuberosity with a push-in–type anchor. This technique is simple and easy and does not require special equipment. Moreover, this approach can augment the single-row repair technique without creating high tension at the cuff end. PMID:25126493

  15. Effect of suture material on platelet deposition onto prosthetic material

    SciTech Connect

    Connolly, R.; McEnroe, C.S.; Li, S.; Coleman, J.; Callow, A.D.

    1988-07-01

    Previous studies have demonstrated the importance of employing prosthetic material with minimal thrombogenicity. However, the role of different suture materials in early thrombotic events on prosthetic materials has not been examined. Experiments were designed to analyze the effects of suture on platelet graft interaction using an in vivo baboon hemocompatability screen. Indium labeled, autologous platelet deposition was determined on expanded polytetrafluoroethylene (ePTFE) containing suture lines of polypropylene (Prolene), polybutester (Novafil), and ePTFE (Gore-Tex). A significant increase in platelet deposition was noted not only at the suture line, but proximal and distal to it as well. The results were different for each of the sutures employed and suggest that the suture line may influence early platelet deposition in the perianastomotic region, not only at the suture line, but proximally and distally as well.

  16. A Barbed Suture Repair For Flexor Tendons: A Novel Technique With No Exposed Barbs

    PubMed Central

    Sugrue, Conor; Chan, Jeffrey C.; Delgado, Luis; Zeugolis, Dimitrios; Carroll, Seam M.; Kelly, Jack L.

    2014-01-01

    Background: Barbed suture technology has shown promise in flexor tendon repairs, as there is an even distribution of load and the need for a knot is eliminated. We propose that a quick and simple, novel, barbed technique without any exposed barbs on the tendon surface has comparable strength and a smaller cross-sectional area at the repair site than traditional methods of repair. Methods: Forty porcine flexor tendons were randomized to polybutester 4-strand barbed repair or to 4-strand Adelaide monofilament repair. The cross-sectional area was measured before and after repair. Biomechanical testing was carried out and 2-mm gap formation force, ultimate strength of repair, and method of failure were recorded. Results: The mean ultimate strength of the barbed repairs was 54.51 ± 17.9 while that of the Adelaide repairs was 53.17 ± 16.35. The mean 2-mm gap formation force for the barbed group was 44.71 ± 17.86 whereas that of the Adelaide group was 20.25 ± 4.99. The postrepair percentage change in cross-sectional area at the repair site for the Adelaide group and barbed group was 12.0 ± 2.3 and 4.6 ± 2.8, respectively. Conclusions: We demonstrated that a 4-strand knotless, barbed method attained comparable strength to that of the traditional Adelaide repair technique. The barbed method had a significantly reduced cross-sectional area at the repair site compared with the Adelaide group. The 2-mm gap formation force was less in the barbed group than the Adelaide group. Barbed repairs show promise for tendon repairs; this simple method warrants further study in an animal model. PMID:25426354

  17. Nylon suture toxicity after cataract surgery.

    PubMed

    Balyeat, H D; Davis, R M; Rowsey, J J

    1988-11-01

    A cluster of symptoms and signs that appear to be related to wound closure developed in 10 of 105 consecutive patients (9.5%) who underwent uncomplicated planned extracapsular cataract extraction (ECCE) with posterior chamber intraocular lens (PC IOL) implants. These signs and symptoms included foreign body sensation, conjunctival injection and infiltrates localized to the scleral wound, and scleral excavation underlying the running 10-0 nylon suture possibly resulting from localized scleral edema. The clinical presentation ranged from 1 to 6 weeks. Conjunctival stains demonstrated eosinophils and polymorphonuclear leukocytes in some cases. Gram stains, conjunctival cultures, and results of suture toxicology studies were negative. The authors believe that these findings represent a previously unreported complication after ECCE: acute inflammation primarily localized to the conjunctiva and sclera adjacent to the cataract wound. The etiology of this postoperative complication is yet to be determined. PMID:3211459

  18. Adding 2-handles to sutured manifolds

    Microsoft Academic Search

    Scott A. Taylor

    2008-01-01

    Combinatorial sutured manifold theory is used to study the effects of\\u000aattaching a 2-handle to an essential simple closed curve on a genus two\\u000aboundary component of a compact, orientable 3-manifold. The main results\\u000aconcern degenerating handle additions to a simple 3-manifold and essential\\u000asurfaces in the exterior of a knot or link obtained by ``boring'' a split link\\u000aor

  19. The Di Giacomo technique: simplified suture passing in SLAP repair.

    PubMed

    Selby, Ronald M; Altchek, David W; Di Giacomo, Giovanni

    2007-04-01

    A 30 degrees arthroscope is introduced via the posterior soft spot portal, and an anterosuperior portal is created with the use of a 7-mm disposable cannula. The anterosuperior portal is used for instrumentation. An 18-gauge spinal needle is passed via the portal of Neviaser and the rotator cuff into arthroscopic view above the superior labrum. A No. 1 polydioxanone suture (PDS; Ethicon, Somerville, NJ) is advanced through the spinal needle. An arthroscopic retriever or meniscal clamp is used to retrieve the free end of the suture and bring it out through a small anterior stab wound. A suture anchor is inserted via the anterosuperior portal into the superior neck of the glenoid. The more medial limb of the No. 2 Ethibond suture (Ethicon) from the suture anchor is retrieved with the inferior limb of the No. 1 PDS suture, and both are brought out through the anterosuperior cannula. The opposite end of the No. 1 PDS suture is then manually pulled, while, under direct arthroscopic visualization, the No. 2 Ethibond suture, now tied to the opposite end of the PDS, is pulled through the superior labral tissue. That anchor suture is retrieved and is placed outside the cannula that contains the other anchor suture. Standard arthroscopic knot tying is then employed. PMID:17418338

  20. "Luggage-tag" suture fixation of partially dislocated intraocular lenses.

    PubMed

    Virata, S R; Holekamp, N M; Meredith, T A

    2001-01-01

    There are many techniques for sulcus-suturing dislocated or partially dislocated intraocular lenses. Many involve passing suture or a knot around the end of the haptic before securing the suture to the sclera. However, in some patients, the tip of the dislocated haptic cannot be visualized. We describe a suturing method using vitrectomy techniques that was used in two patients when the end of the haptic could not be visualized. The technique involves passing an untied loop of double-armed suture under the haptic so that it emerges upward between the haptic and the optic. The loop of suture is regrasped from above the haptic and externalized. The free ends are passed through the loop in a manner analogous to a luggage tag, and the knot is secured. This technique may be useful in patients where the tip of the haptic cannot be visualized, or in patients requiring minimal manipulation of the intraocular lens. PMID:11475406

  1. Massive obstetric haemorrhage following removal of a cervical suture.

    PubMed

    Howarth, Louise Ann; Sherliker, Sarah

    2011-01-01

    The authors present an unusual case of massive ante partum haemorrhage following removal of a cervical suture. This patient was admitted for routine removal of a McDonald's cervical suture at 37 weeks gestation. The suture was densely adherent and after removal she suffered a haemorrhage of 2500 ml from where the suture was removed which led to fetal distress and an emergency caesarean section. The cervix was sutured and a vaginal pack inserted. During the procedure she developed hypovolaemic shock requiring 7 units of blood, 4 units of fresh frozen plasma, 1 unit of platelets and 1 unit of cryoprecipitate. Ten days later she was readmitted with a postpartum haemorrhage of 1000 ml requiring further haemostatic sutures to the cervix. PMID:22696714

  2. Comparison of strength properties of poly-L/D-lactide (PLDLA) 96/4 and polyglyconate (Maxon) sutures: in vitro, in the subcutis, and in the achilles tendon of rabbits.

    PubMed

    Kangas, J; Paasimaa, S; Mäkelä, P; Leppilahti, J; Törmälä, P; Waris, T; Ashammakhi, N

    2001-01-01

    Achilles tendon rupture is a common injury. Absorbable sutures are not commonly used because of their limited strength properties. Recently, sutures with prolonged strength retention properties have been developed. The aim of the study is to test the mechanical properties of recently developed poly-L/D-lactide (PLDLA) sutures in comparison with polyglyconate (Maxon) sutures. PLDLA (0.2 mm thick) and Maxon (4.0) sutures were studied in vitro by immersion in a buffered saline solution (pH 7.4). Tensile strength tests were done on sutures retrieved after 1-26 weeks. In vivo, they were implanted in the subcutis of 32 rabbits. Tensile strength tests were done on sutures retrieved after 1-6 weeks. The sutures were also used to repair the Achilles tendon in rabbits. Maximum force before breaking and percentage elongation of tendons were determined. Although PLDLA had a lower initial tensile strength than Maxon, PLDLA showed more prolonged tensile strength retention than Maxon. Tendons repaired with PLDLA, however, had a lower strength than Maxon-repaired tendons at six weeks (insignificant difference). PLDLA has more prolonged tensile strength properties compared with Maxon. Thus, PLDLA offers an alternative to Maxon in repair of the Achilles tendon. PMID:11153008

  3. Bioinspired, mechanical, deterministic fractal model for hierarchical suture joints

    NASA Astrophysics Data System (ADS)

    Li, Yaning; Ortiz, Christine; Boyce, Mary C.

    2012-03-01

    Many biological systems possess hierarchical and fractal-like interfaces and joint structures that bear and transmit loads, absorb energy, and accommodate growth, respiration, and/or locomotion. In this paper, an elastic deterministic fractal composite mechanical model was formulated to quantitatively investigate the role of structural hierarchy on the stiffness, strength, and failure of suture joints. From this model, it was revealed that the number of hierarchies (N) can be used to tailor and to amplify mechanical properties nonlinearly and with high sensitivity over a wide range of values (orders of magnitude) for a given volume and weight. Additionally, increasing hierarchy was found to result in mechanical interlocking of higher-order teeth, which creates additional load resistance capability, thereby preventing catastrophic failure in major teeth and providing flaw tolerance. Hence, this paper shows that the diversity of hierarchical and fractal-like interfaces and joints found in nature have definitive functional consequences and is an effective geometric-structural strategy to achieve different properties with limited material options in nature when other structural geometries and parameters are biologically challenging or inaccessible. This paper also indicates the use of hierarchy as a design strategy to increase design space and provides predictive capabilities to guide the mechanical design of synthetic flaw-tolerant bioinspired interfaces and joints.

  4. On sutured Floer homology and the equivalence of Seifert surfaces

    E-print Network

    Hedden, Matthew; Sarkar, Sucharit

    2008-01-01

    We study the sutured Floer homology invariants of the sutured manifold obtained by cutting a knot complement along a Seifert surface, R. We show that these invariants are finer than the "top term" of the knot Floer homology, which they contain. In particular, we use sutured Floer homology to distinguish two non-isotopic minimal genus Seifert surfaces for the knot 8_3. A key ingredient for this technique is finding appropriate Heegaard diagrams for the sutured manifold associated to the complement of a Seifert surface.

  5. Heterochrony and patterns of cranial suture closure in hystricognath rodents

    PubMed Central

    Wilson, Laura A B; Sánchez-Villagra, Marcelo R

    2009-01-01

    Sutures, joints that allow one bone to articulate with another through intervening fibrous connective tissue, serve as major sites of bone expansion during postnatal craniofacial growth in the vertebrate skull and represent an aspect of cranial ontogeny which may exhibit functional and phylogenetic correlates. Suture evolution among hystricognath rodents, an ecologically diverse group represented here by 26 species, is examined using sequence heterochrony methods, i.e. event pairing and parsimov. Although minor nuances in suture closure sequence exist between species, the overall sequence was found to be conserved both across the hystricognath group and, to an increasing degree, within selected clades. At species level, suture closure pattern exhibited a significant positive correlation with patterns previously reported for hominoids. Patterns for most clades revealed the first sutures to close are those contacting the exoccipital, interparietal, and palatine bones. Heterochronic shifts were found along 19 of 35 branches within the hystricognath phylogeny. The number of shifts per node ranged from one to seven events and, overall, involved 21 of 34 suture sites. The topology generated by parsimony analyses of the event pair matrix yielded only one grouping that was congruent with the evolutionary relationships, compiled from morphological and molecular studies, taken as framework. Sutures contacting the exoccipital displayed the highest levels of most complete closure across all species. Level of suture closure is negatively correlated with cranial length (P < 0.05). Differing life history and locomotory strategies are coupled in part with differing suture closure patterns among several species. PMID:19245501

  6. Visual Measurement of Suture Strain for Robotic Surgery

    PubMed Central

    Martell, John; Elmer, Thomas; Gopalsami, Nachappa; Park, Young Soo

    2011-01-01

    Minimally invasive surgical procedures offer advantages of smaller incisions, decreased hospital length of stay, and rapid postoperative recovery to the patient. Surgical robots improve access and visualization intraoperatively and have expanded the indications for minimally invasive procedures. A limitation of the DaVinci surgical robot is a lack of sensory feedback to the operative surgeon. Experienced robotic surgeons use visual interpretation of tissue and suture deformation as a surrogate for tactile feedback. A difficulty encountered during robotic surgery is maintaining adequate suture tension while tying knots or following a running anastomotic suture. Displaying suture strain in real time has potential to decrease the learning curve and improve the performance and safety of robotic surgical procedures. Conventional strain measurement methods involve installation of complex sensors on the robotic instruments. This paper presents a noninvasive video processing-based method to determine strain in surgical sutures. The method accurately calculates strain in suture by processing video from the existing surgical camera, making implementation uncomplicated. The video analysis method was developed and validated using video of suture strain standards on a servohydraulic testing system. The video-based suture strain algorithm is shown capable of measuring suture strains of 0.2% with subpixel resolution and proven reliability under various conditions. PMID:21436874

  7. Techniques and applications of adjustable sutures.

    PubMed

    Fells, P

    1987-02-01

    The 'rediscovery' of adjustable sutures some 10 years ago has given the ophthalmic surgeon much more confidence in his ability to correct strabismus. Three methods of use are described: during surgery under general anaesthesia with adjustment during the operation using the 'springback' test to centralise the eye; during surgery under general anaesthesia and subsequent adjustment under local anaesthesia using the patient's subjective responses to obtain optimal positioning; and performance of the operation and adjustment under topical local anaesthesia in one procedure. Full details are given of each technique and the indications for their application to particular problems are discussed. PMID:3297111

  8. Evolution of Complexity in Paleozoic Ammonoid Sutures.

    PubMed

    Saunders; Work; Nikolaeva

    1999-10-22

    The septal sutures of 588 genera of Paleozoic ammonoids showed a 1600 percent increase in mean complexity over 140 million years. Within 475 ancestor/descendant pairs, descendants were more than twice as likely to be more complex than their ancestors. Twelve subclades (373 genera) averaged 34 percent increased complexity. These patterns are compatible with an active or driven system of long-term bias for increased complexity. Mass extinctions acted in opposition to this long-term trend, tending to eliminate more-complex forms and resetting the trend with each extinction event. PMID:10531058

  9. Are intracostal sutures better than pericostal sutures for closing a thoracotomy?

    PubMed Central

    Visagan, Ravindran; McCormack, David J.; Shipolini, Alex R.; Jarral, Omar A.

    2012-01-01

    A best evidence topic was written according to a structured protocol. The question addressed was to identify which thoracotomy closure method lends itself to the least postoperative pain. Altogether 109 papers were found using the reported search; of which, seven represented the best evidence to answer the clinical question. The authors, journal, date and country of publication, patient group studied, study type, relevant outcomes and results of these papers are tabulated. We conclude that the closure by intracostal sutures with intercostal nerve sparing offers a superior postoperative pain profile for thoracotomy patients when compared with conventional techniques. Up to 1-year follow-up has shown that this technique (avoiding strangulation of the intercostal nerve) leads to lower postoperative pain and analgesic use, better ambulation and a quicker return to daily activities. Three papers (including two randomized trials) found intracostal sutures with intercostal nerve sparing techniques to be superior to conventional methods such as pericostal suture closure. Rib approximation with intercostal nerve sparing was found to be superior to rib approximation without nerve sparing in one study. Two studies associated with the creation of an intercostal muscle flap prior to the insertion of a rib retractor to be associated with significantly reduced postoperative pain. One study described a novel ‘edge-closure’ technique, comparable to the closure with intracostal sutures without drilling, to be superior to conventional closure with pericostal sutures. Postoperative pain is a significant issue faced by thoracic surgeons both in-hospital and in the longer term where patients may complain of chronic thoracotomy pain. We would therefore recommend that some form of intercostal nerve protection be implemented during thoracotomy opening and closure. PMID:22431654

  10. The mechanical interaction between three geometric types of nylon core suture and a running epitenon suture in repair of porcine flexor tendons.

    PubMed

    de Wit, T; Walbeehm, E T; Hovius, S E R; McGrouther, D A

    2013-09-01

    The effect of core suture geometry on the mechanical interaction with the epitenon suture in terms of gap prevention, failure strength and mode of failure was investigated in a flexor tendon repair model. A total of 48 porcine flexor tendons were repaired using three techniques with distinct core suture geometry: single Kessler; double Kessler; and cruciate repair. Cyclic linear testing was carried out with and without a simple running epitenon suture. At failure load the epitenon suture reduced gapping by 87% in the double Kessler, 42% in the single Kessler and 15% in cruciate repairs. It increased the strengths of the repairs by 58%, 33% and 24%, respectively. Kessler repairs failed mainly by suture rupture, with and without epitenon suture, but cruciate repairs failed mainly by suture pull-out. The epitenon suture did not have a significant mechanical effect on the three repairs. Rather, its effect varied with the core suture geometry. The greatest effect occurred with double Kessler repairs. PMID:23649010

  11. 21 CFR 878.4495 - Stainless steel suture.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    21 Food and Drugs 8 2010-04-01 2010-04-01 false Stainless steel suture...unneedled nonabsorbable surgical suture composed of 316L stainless steel, in USP sizes 12-0 through 10, or a substantially equivalent stainless...

  12. A biomechanical comparison of suture constructs used for coracoclavicular fixation.

    PubMed

    Wickham, M Quinn; Wyland, Douglas J; Glisson, Richard R; Speer, Kevin P

    2003-01-01

    There is no consensus regarding surgical treatment for severely dislocated acromioclavicular joints. Although many treatments are suture-based, the suture materials and resulting suture-bone constructs have been subjected to limited systematic evaluation. This study identifies the strongest and least deforming suture construct among those commonly used for such repairs. Each suture-based repair was tested on a simulated clavicle and coracoid process with the skeletal components distracted until the suture failed to obtain tensile strength. Additional groups of sutures were subjected to cyclic loading to determine resistance to deformation. Panacryl braid had significantly greater tensile strength than all other constructs: Polydioxanone (PDS) braid, Mersilene tape, and Ethibond #5. Deformation after cyclic loading of Panacryl braid, PDS braid, and two strands of Mersilene tape was significantly less than that of the other constructs. A bioabsorbable suture loop, such as Panacryl, can act as a temporary internal splint, maintaining acromioclavicular joint reduction long enough for ligamentous healing during rehabilitation, and can avoid complications associated with permanent fixation materials. Panacryl braid deserves serious consideration for coracoclavicular fixation because of its strength, resistance to deformation, and bioabsorbable properties. PMID:14577722

  13. Assessment of surgical sutures POLYMED® by intracutaneous irritation test in rabbits

    PubMed Central

    Danchev, Nikolai

    2013-01-01

    The aim of the present study was to evaluate local irritant effects to rabbit skin following a single application of test samples of non-sterile polyamide non-absorbable surgical sutures POLYMED®. The polar and nonpolar extracts were prepared by using saline solution and olive oil, respectively, after sinking the materials tested (2.0 g) in 10 ml of the corresponding liquid. Incubation was carried out at the temperature of 37 °C for 72 h. The saline solution and pure olive oil, which had no contact with the materials tested, were used as negative control samples and were incubated under the same conditions as above. Assessments of the extracts from each material were conducted on 2 albino rabbits of the New Zealand breed. On the back of each animal, 5 intracutaneous injections of the extract tested and 5 injections of the control solution, each of 0.2 ml, were carried out. The degree of irritation was scored at 4, 24, 48, 72 hours after injection and no skin changes were found. The intracutaneous irritation index (III) was calculated and yielded 0.0. Hence it was concluded that under the experimental conditions the extracts of the material tested, i.e. non-sterile polyamide non-absorbable surgical sutures POLYMED®, were ‘non-irritant’ to the skin of rabbits when compared with the respective control groups. The experimental procedure was conducted according to ISO10993-10. PMID:24179436

  14. Are mechanical microvascular anastomoses easier to learn than suture anastomoses?

    PubMed

    Zdolsek, Johann; Ledin, Håkan; Lidman, Disa

    2005-01-01

    Sutured anastomoses of small vessels are considered difficult to learn. Mechanical anastomosis systems allow a more rapidly performed anastomosis. In order to compare the process of learning to perform sutured and mechanical microvascular anastomoses, two surgeons, with limited microvascular experience, performed 30 aortic and 30 femoral vein anastomoses in 30 Wistar rats. The methods compared were conventional suture, vascular closure system (VCS) and microvascular anastomatic coupler system (MAC). There were no inter-surgeon differences regarding patency or time to perform anastomoses. The average time to perform a suture anastomosis was 39 min (patency 80%). Anastomoses with the VCS system took 24 min (patency 25%), whereas the MAC couplers took 13 min to perform (patency 95%). There was a significant learning effect with sutures, but no obvious reduction in time to perform MAC coupler or VCS clip anastomoses was seen. MAC couplers were easiest to use, and allowed us to perform rapid anastomoses with high patency. PMID:16284953

  15. Usefulness of continuous suture using short-thread double-armed micro-suture for cerebral vascular anastomosis

    PubMed Central

    Haga, Sei; Nagata, Shinji

    2014-01-01

    Background: When microvascular anastomosis is performed in a deep, narrow operating field, securing space to throw knots is difficult. To simplify the procedure and avoid obstruction of the anastomosis, we use a continuous suturing with short-thread double-armed micro-suture. Methods: Sixty-four patients (38 cerebral revasculazation, 16 moyamoya disease, and 10 aneurysm surgery) undergoing microvaucular anastomosis were included. During anastomosis, a continuous suture was placed with short-thread double-armed micro-suture. Results: During 64 microanastomosis procedures, 64 consecutive continuous sutures were performed with 1-year follow up. All patients showed patency of anastomosis with long-term follow up. Conclusions: This technique is especially useful for anastomosis in a deep, narrow surgical field, such as in superior cerebellar artery anastomosis. PMID:25396075

  16. Endoluminal suturing of an anastomotic leak.

    PubMed

    Gaur, Puja; Lyons, Calvin; Malik, Tayyaba M; Kim, Min P; Blackmon, Shanda H

    2015-04-01

    An anastomotic leak can be one of the most morbid and complex complications after esophagectomy. Typically, management can entail repair, stenting, or diversion. The leak complicates a patient's postoperative course and delays initiation of any adjuvant therapy. Novel minimally invasive tools created to expedite healing of the anastomotic leak may potentially limit additional procedures traditionally used to treat the leak. We present the case of a 49-year-old man who sustained an anastomotic leak 5 days after undergoing esophagectomy for cancer. He was initially managed with drainage, and when this failed, he was transferred to our hospital. An endoscopic suturing device was used to close the leak and pexy a partially covered self-expanding metal stent that was left in place for 2 weeks. At the end of 2 weeks, the leak healed and there was no stent migration. PMID:25841828

  17. [Sutures in dentistry. Traditional and PTFE materials].

    PubMed

    La Scala, G; Lleo, M M

    1990-09-30

    Suture material in PTFE is successfully used in vascular and orthopaedic surgery since many years. More recently it has been applied also in periodontal surgeries, in the guided tissue regeneration technique, thanks to its chemical-physical, mechanical and biological characteristics. The Authors tried to evaluate the indications for the use of this material in different situations in the dental practice. Furthermore a microbiologic study has been carried out, both in vivo and in vitro, and this material has been compared with the twisted coated silk to evaluate the different bacteriological characteristics. In particular it has been demonstrated the reduced adhesion of PTFE in comparison to the twisted silk. This characteristic seemed to be even more relevant after a longer stay of the materials in the oral cavity. PMID:2279592

  18. Cranial suture morphology and its relationship to diet in Cebus.

    PubMed

    Byron, Craig D

    2009-12-01

    Cranial sutures are complex morphological structures. Four Cebus species (C. albifrons, C. apella, C. capucinus, C. olivaceus) are used here to test the hypothesis that sagittal suture complexity is enhanced in animals that eat materially challenging foods. These primates are ideal for such comparative studies because they are closely related and some are known to exhibit differences in the material properties of the foods they ingest and masticate. Specifically, Cebus apella is notable among members of this genus for ingesting food items of high toughness as well as consistently demonstrating a relatively robust cranial morphology. Consistent with previous studies, C. apella demonstrates significantly more robust mandibular and temporal fossa morphology. Also, C. apella possesses sagittal sutures that are more complex than congenerics. These data are used to support the hypothesis that cranial suture complexity is increased in response to consuming diets with more obdurate material properties. One interpretation of this hypothesis is that, compared to non-apelloids, total strain in the apelloid cranial suture connective tissue environment is elevated due to increased jaw muscle activity by increases in either force magnitudes or the number of chewing events. It is argued that greater masticatory function enhances the growth and modeling of cranial suture interdigitation. These data show that cranial suture complexity is one more hard tissue feature from the skull that might be used to inform hypotheses of dietary functional morphology. PMID:19833377

  19. A comparison of ultrasonic suture welding and traditional knot tying.

    PubMed

    Richmond, J C

    2001-01-01

    The slippage of knots and the technical challenge of tying them securely are potential impediments to certain arthroscopic procedures. Ultrasonic energy delivered at 70 kHz can be used to weld No. 2 polypropylene suture. This method was compared with a traditional knot (surgeon's knot with four alternating half hitches) tied with an open technique to determine whether welding of sutures is comparable, in mechanical properties, to hand-tied knots. Both loops were fashioned around a 0.25-inch mandrel and then tested. The load to reach 3-mm elongation (point of likely biologic failure of a repair) was significantly greater for welded sutures than for knots. The elongation at ultimate failure was significantly less for welded sutures than for knots. The number of cycles to failure and the creep after initial displacement were similar for both welded and knotted suture loops. The ultimate load to failure was significantly greater for the knotted than for the welded suture. The welding of suture for the repair of musculoskeletal soft tissue presents an attractive alternative to traditional knot tying, particularly for arthroscopic applications. PMID:11394598

  20. Left atrial appendage occlusion by invagination and double suture technique.

    PubMed

    Hernandez-Estefania, Rafael; Levy Praschker, Beltran; Bastarrika, Gorka; Rabago, Gregorio

    2012-01-01

    Left atrial appendage (LAA) plays a crucial role as a source of atrial thrombus in patients with atrial fibrillation (AF). Thus, the need to close LAA becomes evident in patients with AF who undergo concomitant mitral valve surgery. Unfortunately, it has been reported a high rate of unsuccessful LAA occlusion, regardless of the technique employed.We propose a safe and simple method for LAA occlusion consisting in invagination of the appendage into the left atrium, followed by two sutures (purse string suture around the base of the LAA and a reinforce running suture). PMID:21684756

  1. Spatial motion constraints for robot assisted suturing using virtual fixtures.

    PubMed

    Kapoor, Ankur; Li, Ming; Taylor, Russell H

    2005-01-01

    We address the problem of the stitching task in endoscopic surgery using a circular needle under robotic assistance. Our main focus is to present an algorithm for suturing using guidance virtual fixtures (VF) that assist the surgeon to move towards a desired goal. A weighted multi-objective, constraint optimization framework is used to compute the joint motions required for the tasks. We show that with the help of VF, suturing can be performed at awkward angles without multiple trials, thus avoiding damage to tissue. In this preliminary study we show the feasibility of our approach and demonstrate the promise of cooperative assistance in complex tasks such as suturing. PMID:16685947

  2. Standardization of test methodology: a comparison between three suture anchors

    E-print Network

    Jonnalagadda, Silpa P.

    2005-08-29

    of this research is to compare the durability of three commercial suture anchors manufactured by Innovative Animal Products, Securos Veterinary Orthopedic Inc. and IMEXTM by comparing their pullout loads after cyclic loading. This research also aims to determine...

  3. 21 CFR 870.3460 - Endovascular Suturing System.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...endovascular suturing system is a medical device intended to provide fixation and sealing between an endovascular graft and the native artery. The system is comprised of the implant device and an endovascular delivery device used to implant the endovascular...

  4. 21 CFR 878.5030 - Natural nonabsorbable silk surgical suture.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GENERAL AND PLASTIC SURGERY DEVICES Surgical Devices § 878.5030 Natural nonabsorbable silk surgical suture. (a)...

  5. 21 CFR 878.5020 - Nonabsorbable polyamide surgical suture.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ... FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GENERAL AND PLASTIC SURGERY DEVICES Surgical Devices § 878.5020 Nonabsorbable polyamide surgical suture. (a) Identification....

  6. 21 CFR 878.4495 - Stainless steel suture.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ... FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GENERAL AND PLASTIC SURGERY DEVICES Surgical Devices § 878.4495 Stainless steel suture. (a) Identification. A stainless steel...

  7. 21 CFR 878.5030 - Natural nonabsorbable silk surgical suture.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ... FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GENERAL AND PLASTIC SURGERY DEVICES Surgical Devices § 878.5030 Natural nonabsorbable silk surgical suture. (a) Identification....

  8. 21 CFR 878.5020 - Nonabsorbable polyamide surgical suture.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ... FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GENERAL AND PLASTIC SURGERY DEVICES Surgical Devices § 878.5020 Nonabsorbable polyamide surgical suture. (a) Identification....

  9. 21 CFR 878.5030 - Natural nonabsorbable silk surgical suture.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ... FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GENERAL AND PLASTIC SURGERY DEVICES Surgical Devices § 878.5030 Natural nonabsorbable silk surgical suture. (a) Identification....

  10. 21 CFR 878.5030 - Natural nonabsorbable silk surgical suture.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ... FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GENERAL AND PLASTIC SURGERY DEVICES Surgical Devices § 878.5030 Natural nonabsorbable silk surgical suture. (a) Identification....

  11. 21 CFR 878.5030 - Natural nonabsorbable silk surgical suture.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ... FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GENERAL AND PLASTIC SURGERY DEVICES Surgical Devices § 878.5030 Natural nonabsorbable silk surgical suture. (a) Identification....

  12. 21 CFR 878.4495 - Stainless steel suture.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ... FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GENERAL AND PLASTIC SURGERY DEVICES Surgical Devices § 878.4495 Stainless steel suture. (a) Identification. A stainless steel...

  13. 21 CFR 878.4495 - Stainless steel suture.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ... FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GENERAL AND PLASTIC SURGERY DEVICES Surgical Devices § 878.4495 Stainless steel suture. (a) Identification. A stainless steel...

  14. 21 CFR 878.5020 - Nonabsorbable polyamide surgical suture.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ... FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GENERAL AND PLASTIC SURGERY DEVICES Surgical Devices § 878.5020 Nonabsorbable polyamide surgical suture. (a) Identification....

  15. 21 CFR 878.4495 - Stainless steel suture.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ... FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GENERAL AND PLASTIC SURGERY DEVICES Surgical Devices § 878.4495 Stainless steel suture. (a) Identification. A stainless steel...

  16. 21 CFR 878.5020 - Nonabsorbable polyamide surgical suture.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ... FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GENERAL AND PLASTIC SURGERY DEVICES Surgical Devices § 878.5020 Nonabsorbable polyamide surgical suture. (a) Identification....

  17. External Dacryocystorhinostomy with and Without Suturing the Posterior Mucosal Flaps

    PubMed Central

    Kaçaniku, Gazmend; Begolli, Ilir

    2014-01-01

    ABSTRACT Purpose: To evaluate the outcome of the external dacryocystorhinostomy with and without suturing the posterior mucosal flaps. Methods: This study included 106 patients with lacrimal drainage system disorders who underwent the external dacryocystorhinostomy. Fifty four patients (Group A) underwent external dacryocystorhinostomy with suturing anterior and posterior flaps of the lacrimal sac and nasal mucosa, and the results obtained were compared with those of another series of 52 patients (Group B) where dacryocystorhinostomy was performed with suturing only the anterior flaps, whereas posterior mucosal flaps were excised. Results: The success rate was evaluated by lacrimal patency to irrigation and relief of epiphora. Patency achieved in groups A and B was 94.4% and 96.2%, respectively. There was no statistically significant difference in success rate between the groups. Conclusion: Our study suggests that external dacryocystorhinostomy with suturing anterior and posterior flaps have no advantage over dacryocystorhinostomy with suturing only anterior flaps. Anastomosis by suturing only anterior flaps and excision of the posterior flaps is easier to perform and may improve the success rate of external dacryocystorhinostomy. PMID:24783915

  18. First investigation of spider silk as a braided microsurgical suture.

    PubMed

    Kuhbier, Joern W; Reimers, Kerstin; Kasper, Cornelia; Allmeling, Christina; Hillmer, Anja; Menger, Björn; Vogt, Peter M; Radtke, Christine

    2011-05-01

    Inhibition of axonal outgrowth accompanied by neuroma formation appears in microsurgical nerve repair as reaction to common microsuture materials like silk, nylon, or polyglycolic acid. In contrast, recent findings revealed advantages of spider silk fibers in guiding Schwann cells in nerve regeneration. Here, we asked if we could braid microsutures from native spider silk fibers. Microsutures braided of native spider dragline silk were manufactured, containing either 2 × 15 or 3 × 10 single fibres strands. Morphologic appearance was studied and tensile strength and stress-strain ratio (SSR) were calculated. The constructed spider silk sutures showed a median thickness of 25 ?m, matching the USP definition of 10-0. Maximum load and tensile strength for both spider silk microsutures were significantly more than 2-fold higher than for nylon suture; SSR was 1.5-fold higher. All values except elasticity were higher in 3 × 10 strand sutures compared to 2 × 15 strand sutures, but not significantly. In this pilot study, we demonstrate the successful manufacture of microsutures from spider silk. With regards to the mechanical properties, these sutures were superior to nylon sutures. As spider silk displays high biocompatibility in nerve regeneration, its usage in microsurgical nerve repair should be considered. PMID:21432995

  19. Active Absorbers M. Rousseaua

    E-print Network

    Paris-Sud XI, Université de

    Introduction An active acoustic absorber must sense the sound field in a room, and generate a signal to absorbActive Absorbers M. Rousseaua and J. Vanderkooyb a B&W Group ltd., Elm Grove Lane, BN44 3SA explores the use of bass loudspeakers as both acoustic sources and broadband absorbers. We develop

  20. Perfect Metamaterial Absorber

    Microsoft Academic Search

    N. I. Landy; S. Sajuyigbe; J. J. Mock; D. R. Smith; W. J. Padilla

    2008-01-01

    We present the design for an absorbing metamaterial (MM) with near unity absorbance A(omega). Our structure consists of two MM resonators that couple separately to electric and magnetic fields so as to absorb all incident radiation within a single unit cell layer. We fabricate, characterize, and analyze a MM absorber with a slightly lower predicted A(omega) of 96%. Unlike conventional

  1. Randomized Comparison of Nylon Versus Absorbing Polyglactin 910 for Fascial Closure in Caesarean Section

    PubMed Central

    Rezaie Kahkhaie, Kolsoum; Rezaie Keikhaie, Khadije; Shahreki Vahed, Aziz; Shirazi, Mahboobeh; Amjadi, Nooshin

    2014-01-01

    Background: Regardless of numerous advances in surgical techniques, selection of the best technique to sew up wounds and the best suture material are still controversial. Several postoperative complications, including wound infection, stitched wound, chronic incision pain, wound dehiscence and hernia stitches result from many factors such as used suture material. Objectives: The aim of the present study was to investigate the complications of pfannenstiel incision and nylon/ polyglactin 910 sutures utilization in patients undergoing c-section cesarean. Patients and Methods: This clinical trial was conducted on 120 women who underwent caesarean section at Imam-Ali hospital in Zabol, Iran. In this study, patients were equally divided into two groups of 60 people (50% in nylon suture and 50% in polyglactin 910 sutures). Patients of the two groups were investigated by a gynecologist 24-48 hours after the operation, a week later and on the sixth month of surgery. Moreover, time of wound dehiscence and treatment duration, the level of sinus infection, chronic incision pain and incision hernia were studied. The results were analyzed by SPSS software. P ? 0.05 was considered as statistically signi?cant. Results: One hundred and twenty patients undergoing a cesarean section at Imam-Ali hospital in Zabol were recruited into the study, 60 in the Nylon group and 60 in Polyglactin 910group. Our data demonstrated a statistically higher incidence of suture sinus and chronic incision pain in the nylon group (P < 0.05). No statistically signi?cant difference in wound stitch and incision hernia was demonstrated between the suture groups. Conclusions: The results of our trial did not demonstrate a significant difference between absorbing polyglactin 910 (PDS) and nylon regarding incision hernia, wound infection and wound dehiscence. However, subjects sutured with PDS were less likely to experience chronic incision pain and wound stitch. Therefore, PDS appears to be the optimal choice for fascial closure after cesarean section. PMID:24910791

  2. Comparing historical catch rates of American shad in multifilament and monofilament nets: A step toward setting restoration targets for Virginia stocks

    USGS Publications Warehouse

    Maki, K.L.; Hoenig, J.M.; Olney, J.E.; Heisey, D.M.

    2006-01-01

    Recreational and commercial harvest of American shad Alosa sapidissima in the Virginia waters of the Chesapeake Bay and its tributaries has been prohibited since 1994. The Atlantic States Marine Fisheries Commission Shad and River Herring Management Plan requires that Virginia develop restoration targets for its shad populations, but estimates of their sizes are not available and there is little information about historic population levels. Thus, establishing restoration targets based on population size is problematic. A current spawning stock monitoring program yields catch rate information that can be compared with historic catch rate information recorded in commercial fishery logbooks from the 1950s and the 1980s. However, multifilament gill nets were used in the 1950s and monofilament nets were used in the 1980s (as well as in the current monitoring program). A Latin square design was employed to test the differences in relative fishing power of the two gear types over 2 years of seasonal sampling on the York River, Virginia. Estimates are that the monofilament nets are roughly twice as efficient as the multifilament nets. Reported catch rates in the 1950s and 1980s are roughly equivalent. However, when adjustments are made for the differences in fishing gear, catch rates for the 1950s are twice as high as those during the 1980s. These results provide valuable information for setting restoration targets for Virginia stocks of American shad. ?? Copyright by the American Fisheries Society 2006.

  3. Changes in Biomechanical Strain and Morphology of Rat Calvarial Sutures and Bone after Tgf-?3 Inhibition of Posterior Interfrontal Suture Fusion

    PubMed Central

    Shibazaki-Yorozuya, Reiko; Wang, Qian; Dechow, Paul C.; Maki, Koutaro; Opperman, Lynne A.

    2012-01-01

    Craniofacial sutures are bone growth fronts that respond and adapt to biomechanical environments. Little is known of the role sutures play in regulating the skull biomechanical environment during patency and fusion conditions, especially how delayed or premature suture fusion will impact skull biomechanics. Tgf-?3 has been shown to prevent or delay suture fusion over the short term in rat skulls, yet the long-term patency or its consequences in treated sutures is not known. It was therefore hypothesized that Tgf-?3 had a long-term impact to prevent suture fusion and thus alter the skull biomechanics. In this study, collagen gels containing 3 ng Tgf-?3 were surgically placed superficial to the posterior interfrontal suture and deep to the periosteum in postnatal day 9 (P9) rats. At P9, P24, and P70, biting forces and strains over left parietal bone, posterior interfrontal suture, and sagittal suture were measured with masticatory muscles bilaterally stimulated, after which the rats were sacrificed and suture patency analyzed histologically. Results demonstrated that Tgf-?3 treated sutures showed less fusion over time than control groups, and strain patterns in the skulls of the Tgf-?3 treated group were different from that of the control group. While bite force increased with age, no alterations in bite force were attributable to Tgf-?3 treatment. These findings suggest that the continued presence of patent sutures can affect strain patterns, perhaps when higher bite forces are present as in adult animals. PMID:22528365

  4. Lateral meniscus allograft transplantation: an arthroscopically-assisted single-incision technique using all-inside sutures with a suture hook.

    PubMed

    Lee, Su-Chan; Chang, Woo-Hyuk; Park, Seung-Jun; Kim, Tae-Ho; Sung, Byung-Yoon

    2014-02-01

    We present an arthroscopically-assisted single-incision technique using all-inside sutures with a suture hook in the lateral meniscus allograft transplantation. Although this technique is technically demanding, it provides vertically oriented and secure sutures with good tissue approximation without the accessory skin incision. PMID:23328984

  5. Disposable circumcision suture device: clinical effect and patient satisfaction.

    PubMed

    Lv, Bo-Dong; Zhang, Shi-Geng; Zhu, Xuan-Wen; Zhang, Jie; Chen, Gang; Chen, Min-Fu; Shen, Hong-Liang; Pei, Zai-Jun; Chen, Zhao-Dian

    2014-01-01

    In our experience patients undergoing circumcision are mostly concerned about pain and penile appearances. We conducted a prospective randomized trial to assess the benefits of a new disposable circumcision suture device (DCSD). A total of 942 patients were equally divided into three groups (conventional circumcision, Shang ring and disposable suture device group). Patients in the DCSD group were anesthetized with compound 5% lidocaine cream, the others with a 2% lidocaine penile block. Operation time, intra-operative blood loss, incision healing time, intra-operative and post-operative pain, the penile appearance and overall satisfaction degree were measured. Operation time and intra-operative blood loss were significantly lower in the Shang ring and suture device groups compared to the conventional group (P < 0.001). Intra-operative pain was less in the suture device group compared with the other two groups (P < 0.001); whereas post-operative pain was higher in the conventional group compared to the other two groups (P < 0.001). Patients in the suture device (80.57%) and Shang ring (73.57%) groups were more satisfied with penile appearances compared with the conventional circumcision group (20.06%, P < 0.05). Patients in suture device group also healed markedly faster than the conventional group (P < 0.01). The overall satisfaction rate was better in the suture device group (78.66%) compared with the conventional (47.13%) and Shang ring (50.00%) groups (P < 0.05). The combination of DCSD and lidocaine cream resulted in shorter operation and incision healing times, reduced intra-operative and post-operative pain and improved patient satisfaction with the cosmetic appearances. PMID:24759586

  6. Disposable circumcision suture device: clinical effect and patient satisfaction

    PubMed Central

    Lv, Bo-Dong; Zhang, Shi-Geng; Zhu, Xuan-Wen; Zhang, Jie; Chen, Gang; Chen, Min-Fu; Shen, Hong-Liang; Pei, Zai-Jun; Chen, Zhao-Dian

    2014-01-01

    In our experience patients undergoing circumcision are mostly concerned about pain and penile appearances. We conducted a prospective randomized trial to assess the benefits of a new disposable circumcision suture device (DCSD). A total of 942 patients were equally divided into three groups (conventional circumcision, Shang ring and disposable suture device group). Patients in the DCSD group were anesthetized with compound 5% lidocaine cream, the others with a 2% lidocaine penile block. Operation time, intra-operative blood loss, incision healing time, intra-operative and post-operative pain, the penile appearance and overall satisfaction degree were measured. Operation time and intra-operative blood loss were significantly lower in the Shang ring and suture device groups compared to the conventional group (P < 0.001). Intra-operative pain was less in the suture device group compared with the other two groups (P < 0.001); whereas post-operative pain was higher in the conventional group compared to the other two groups (P < 0.001). Patients in the suture device (80.57%) and Shang ring (73.57%) groups were more satisfied with penile appearances compared with the conventional circumcision group (20.06%, P < 0.05). Patients in suture device group also healed markedly faster than the conventional group (P < 0.01). The overall satisfaction rate was better in the suture device group (78.66%) compared with the conventional (47.13%) and Shang ring (50.00%) groups (P < 0.05). The combination of DCSD and lidocaine cream resulted in shorter operation and incision healing times, reduced intra-operative and post-operative pain and improved patient satisfaction with the cosmetic appearances. PMID:24759586

  7. Study of Insertion Force and Deformation for Suturing With Precurved NiTi Guidewire.

    PubMed

    Wang, Yancheng; Chen, Roland K; Tai, Bruce L; Xu, Kai; Shih, Albert J

    2015-04-01

    This research presents an experimental study evaluating stomach suturing using a precurved nickel-titanium (NiTi) guidewire for an endoscopic minimally invasive obesity treatment. Precise path planning is critical for accurate and effective suturing. A position measurement system utilizing a hand-held magnetic sensor was used to measure the shape of a precurved guidewire and to determine the radius of curvature before and after suturing. Ex vivo stomach suturing experiments using four different guidewire tip designs varying the radius of curvature and bevel angles were conducted. The changes in radius of curvature and suturing force during suturing were measured. A model was developed to predict the guidewire radius of curvature based on the measured suturing force. Results show that a small bevel angle and a large radius of curvature reduce the suturing force and the combination of small bevel angle and small radius of curvature can maintain the shape of guidewire for accurate suturing. PMID:25480363

  8. Comparison between stainless steel staples and silk sutures for primary closure of skin in patients undergoing neck dissection: A comparative clinical study

    PubMed Central

    Ghosh, Abhishek; Nanjappa, Madan; Nagaraj, Vaibhav; Rajkumar, G. C.

    2015-01-01

    Introduction: Comparison between stainless steel staples and silk sutures for primary closure of skin in patients undergoing neck dissection, in context of rapid application, approximation of the skin edges, economy and aesthetics of the resultant scar. Aim: (1) To compare surgical stainless steel staples and silk sutures for primary wound closure, with respect to presence/absence of wound infection and dehiscence (2) To compare the resultant scar following the two different methods of the closure at 3rd month postoperatively with the help of visual analog scale and analyze the result statistically Design: This study was designed to compare skin closure using staples and silk sutures in patients undergoing neck dissection, using both methods in one-half of the same wound; thus each wound affording its own control. Materials and Methods: The study was conducted on patients requiring collar line incision (high submandibular incision) with or without a cephalad extension of midline lower lip split incision for surgical access, who presented to the Department of Oral and Maxillo-Facial Surgery. (1) Sample size: 10 (2) Study design: Prospective Comparative study (3) Study duration: One and half years (4) Surgical stainless steel staples: Proximate Plus MD 35 W, Ethicon Endo Surgery (5) Sutures: 3–0 Ethiprime NW 5003, Non-Absorbable Surgical Suture, Mersilk-90 cm, Ethicon, (16 mm 3/8 circle cutting needle). Conclusion: It was concluded that there is no significant difference between the scars observed in the regions of incision which underwent primary closure by two different methods, that is surgical stainless steel staples and 3–0 Mersilk Sutures.

  9. Recognizing surgeon's actions during suture operations from video sequences

    NASA Astrophysics Data System (ADS)

    Li, Ye; Ohya, Jun; Chiba, Toshio; Xu, Rong; Yamashita, Hiromasa

    2014-03-01

    Because of the shortage of nurses in the world, the realization of a robotic nurse that can support surgeries autonomously is very important. More specifically, the robotic nurse should be able to autonomously recognize different situations of surgeries so that the robotic nurse can pass necessary surgical tools to the medical doctors in a timely manner. This paper proposes and explores methods that can classify suture and tying actions during suture operations from the video sequence that observes the surgery scene that includes the surgeon's hands. First, the proposed method uses skin pixel detection and foreground extraction to detect the hand area. Then, interest points are randomly chosen from the hand area so that their 3D SIFT descriptors are computed. A word vocabulary is built by applying hierarchical K-means to these descriptors, and the words' frequency histogram, which corresponds to the feature space, is computed. Finally, to classify the actions, either SVM (Support Vector Machine), Nearest Neighbor rule (NN) for the feature space or a method that combines "sliding window" with NN is performed. We collect 53 suture videos and 53 tying videos to build the training set and to test the proposed method experimentally. It turns out that the NN gives higher than 90% accuracies, which are better recognition than SVM. Negative actions, which are different from either suture or tying action, are recognized with quite good accuracies, while "Sliding window" did not show significant improvements for suture and tying and cannot recognize negative actions.

  10. Selective laser vaporization of polypropylene sutures and mesh

    NASA Astrophysics Data System (ADS)

    Burks, David; Rosenbury, Sarah B.; Kennelly, Michael J.; Fried, Nathaniel M.

    2012-02-01

    Complications from polypropylene mesh after surgery for female stress urinary incontinence (SUI) may require tedious surgical revision and removal of mesh materials with risk of damage to healthy adjacent tissue. This study explores selective laser vaporization of polypropylene suture/mesh materials commonly used in SUI. A compact, 7 Watt, 647-nm, red diode laser was operated with a radiant exposure of 81 J/cm2, pulse duration of 100 ms, and 1.0-mm-diameter laser spot. The 647-nm wavelength was selected because its absorption by water, hemoglobin, and other major tissue chromophores is low, while polypropylene absorption is high. Laser vaporization of ~200-?m-diameter polypropylene suture/mesh strands, in contact with fresh urinary tissue samples, ex vivo, was performed. Non-contact temperature mapping of the suture/mesh samples with a thermal camera was also conducted. Photoselective vaporization of polypropylene suture and mesh using a single laser pulse was achieved with peak temperatures of 180 and 232 °C, respectively. In control (safety) studies, direct laser irradiation of tissue alone resulted in only a 1 °C temperature increase. Selective laser vaporization of polypropylene suture/mesh materials is feasible without significant thermal damage to tissue. This technique may be useful for SUI procedures requiring surgical revision.

  11. A generalized mechanical model for suture interfaces of arbitrary geometry

    NASA Astrophysics Data System (ADS)

    Li, Yaning; Ortiz, Christine; Boyce, Mary C.

    2013-04-01

    Suture interfaces with a triangular wave form commonly found in nature have recently been shown to exhibit exceptional mechanical behavior, where geometric parameters such as amplitude, frequency, and hierarchy can be used to nonlinearly tailor and amplify mechanical properties. In this study, using the principle of complementary virtual work, we formulate a generalized, composite mechanical model for arbitrarily-shaped interdigitating suture interfaces in order to more broadly investigate the influence of wave-form geometry on load transmission, deformation mechanisms, anisotropy, and stiffness, strength, and toughness of the suture interface for tensile and shear loading conditions. The application of this suture interface model is exemplified for the case of the general trapezoidal wave-form. Expressions for the in-plane stiffness, strength and fracture toughness and failure mechanisms are derived as nonlinear functions of shape factor ? (which characterizes the general trapezoidal shape as triangular, trapezoidal, rectangular or anti-trapezoidal), the wavelength/amplitude ratio, the interface width/wavelength ratio, and the stiffness and strength ratios of the skeletal/interfacial phases. These results provide guidelines for choosing and tailoring interface geometry to optimize the mechanical performance in resisting different loads. The presented model provides insights into the relation between the mechanical function and the morphological diversity of suture interface geometries observed in natural systems.

  12. Failure strength of repair devices versus meniscus suturing techniques.

    PubMed

    A?ík, Mehmet; Sener, Nadir

    2002-01-01

    The purpose of this study was to compare the load to failure of different common suturing techniques with repair devices. Seventy-one calf medial menisci were cut to simulate peripheral longitudinal tears and repaired with one of 13 repair techniques. The two parts of the meniscus were pulled using the Instron tensometer until failure occurred. The techniques and repair devices tested were vertical (0 PDS, 2-0 PDS, 2-0 Ethibond), horizontal (0 PDS, 2-0 PDS, 2-0 Ethibond) suturing, T-fix, Mitek, Clearfix screw, Clearfix dart, Biostinger, S-D-sorb, and Artrex dart. The strongest repair method in our study was the vertical sutures with 0 PDS. In this study the mean failure strength of all meniscal repair devices was lower than that of the vertical and horizontal suturing techniques. All meniscus repair devices except T-fix and in some the Arthrex dart (40% broken up) pulled out of the menisci. Devices which had only horizontally placed barbs had lower mean failure strength. Failure strength of T-fix was similar to horizontal sutures with 2-0 Ethibond and 2-0 PDS. In conclusion, because all meniscal repair devices had inferior results, when such devices are used, postoperative rehabilitation should not be hastened, and their inferior primary stability should be kept in mind. PMID:11819017

  13. Modified cross-pin femoral fixation using long needles, polydioxanone suture, and traction suture for hamstring anterior cruciate ligament reconstruction.

    PubMed

    Lam, James J.; Poon, Alex K. c.; Ko, Peter P. S.; Ko, Yuen; Tsang Wl, Wai-luk

    2001-03-01

    The use of cross-pin femoral fixation in anterior cruciate ligament (ACL) reconstruction using semitendinosus and gracilis (ST/G) tendons has been shown to be biomechanically sound. As a result of some technical problems that we encountered, we modified the technique of the DePuy OrthoTech Xact ACL Graft Fixation System (DePuy, Warsaw, IN) using No. 2/0 polydioxanone suture (PDS) with long needles normally used for inside-out meniscal repair. In addition, a No. 5 Ethibond suture loop (Ethicon, Somerville, NJ) is used for traction of the ST/G graft up the femoral tunnel. Using a 2-suture loops technique, the traction suture loop offers a more effective in-line pull for the graft and it pulls the ST/G loops slightly higher than the alignment PDS. By so doing, it lessens the chance of kinking the alignment guidewire or even amputating the graft. Although not reported in literature, this type of graft complication is possible in other single-alignment suture or guidewire techniques. PMID:11239357

  14. Delayed-onset endophthalmitis associated with corneal suture infections

    PubMed Central

    2013-01-01

    Background The purpose of the current study was to report the microbiology, risk factors, and treatment outcomes in patients with delayed-onset endophthalmitis associated with corneal suture infections. For this retrospective consecutive case series, a search of the ocular microbiology department database was performed to identify all patients with positive corneal and intraocular cultures (anterior chamber and/or vitreous) between 01 January 1995 and 01 January 2010. A subset of patients with a history of corneal suture infections and delayed-onset endophthalmitis was identified. Results Over the 15-year period of the study, 68 patients were identified to have both positive corneal and intraocular cultures. Among them, six patients were identified to have a culture-proven, delayed-onset endophthalmitis that developed from a culture-positive corneal suture infection. All of the patients in the current study were using topical corticosteroids at the time of diagnosis. In four of six patients, there was documented manipulation of a suture before the development of endophthalmitis. Streptoccocus was identified as the causative organism in five of six patients in the current study. All of the Streptoccocus isolates were sensitive to vancomycin. The single case of Serratia marcescens endophthalmitis was sensitive to amikacin, ceftazidime, ciprofloxacin, gentamicin, and tobramycin. Treatment modalities varied and were guided by the attending ophthalmologist depending upon clinical presentation. One patient with severe Streptococcus pyogenes keratitis and endophthalmitis underwent a primary enucleation after developing a wound dehiscence. Of the remaining five patients, all received topical and intravitreal antibiotics. Therapeutic penetrating keratoplasty was performed in three patients. Pars plana vitrectomy was performed in two patients. Visual acuity outcomes ranged from 20/150 to no light perception. Conclusions In the current study, Streptococcus was isolated in nearly all patients with delayed-onset endophthalmitis associated with corneal suture infections. Topical steroid use and suture manipulation were identified as associated factors for developing endophthalmitis. Visual acuity outcomes were poor despite the prompt recognition of endophthalmitis and appropriate antibiotic therapy. PMID:23758694

  15. Composition for absorbing hydrogen

    DOEpatents

    Heung, Leung K. (Aiken, SC); Wicks, George G. (Aiken, SC); Enz, Glenn L. (N. Augusta, SC)

    1995-01-01

    A hydrogen absorbing composition. The composition comprises a porous glass matrix, made by a sol-gel process, having a hydrogen-absorbing material dispersed throughout the matrix. A sol, made from tetraethyl orthosilicate, is mixed with a hydrogen-absorbing material and solidified to form a porous glass matrix with the hydrogen-absorbing material dispersed uniformly throughout the matrix. The glass matrix has pores large enough to allow gases having hydrogen to pass through the matrix, yet small enough to hold the particles dispersed within the matrix so that the hydrogen-absorbing particles are not released during repeated hydrogen absorption/desorption cycles.

  16. Composition for absorbing hydrogen

    DOEpatents

    Heung, L.K.; Wicks, G.G.; Enz, G.L.

    1995-05-02

    A hydrogen absorbing composition is described. The composition comprises a porous glass matrix, made by a sol-gel process, having a hydrogen-absorbing material dispersed throughout the matrix. A sol, made from tetraethyl orthosilicate, is mixed with a hydrogen-absorbing material and solidified to form a porous glass matrix with the hydrogen-absorbing material dispersed uniformly throughout the matrix. The glass matrix has pores large enough to allow gases having hydrogen to pass through the matrix, yet small enough to hold the particles dispersed within the matrix so that the hydrogen-absorbing particles are not released during repeated hydrogen absorption/desorption cycles.

  17. A Modified Outside-in Suture Technique for Repair of the Middle Segment of the Meniscus Using a Spinal Needle

    PubMed Central

    2014-01-01

    Introduction Several techniques have been used for arthroscopic repair of middle segment, posteromedial or posterolateral corner tears of the meniscus. One of the commonly used methods is the inside-out double arm needle technique. Surgical Technique We have developed a vertical mattress absorbable suture technique. It is easy to perform with a small sized skin incision for knot tying. This technique just necessitates 1 or 2 spinal needles for repair. Materials and Methods Between March 2010 and February 2012, 20 menisci were treated by this technique, a modified method of the outside-in vertical meniscal repair using a spinal needle and No. 2 PDS absorbable suture material. Evaluation of clinical results was done using the Lysholm score. Results The mean preoperative Lysholm score was 63.9 and the mean postoperative score was 97.3. A second look arthroscopy was performed in 13 knees (65%) and the repair sites were well healed. Conclusions We recommend this method as an alternative technique for repair of the middle segment, posteromedial or posterolateral corner of the meniscus. PMID:24639946

  18. The Miller?s knot as an alternative to the surgical knotting? Characterization of the mechanical behavior.

    PubMed

    Ortillés, A; Rodríguez, J; Calvo, B

    2014-10-01

    Several types of materials and surgical suture patterns are used in conventional surgery. Their combination with an appropriate knot is the basis for correct tissue apposition and healing. Knot security is essential to prevent loosening or slipping before the suture line is completely closed. Nevertheless, the knot itself is the weakest link in any surgical handling. The aim of this study is to determine and compare the mechanical behavior of four surgical knot types (square knot, surgeon?s knot, square slipknot and Miller?s knot) performed with three different suture materials (absorbable monofilament glyconate, non-absorbable monofilament polyamide and absorbable braided polyglycolic acid) in a non-biological experimental in vitro model (a tube of synthetic material with non-linear mechanical behavior). The mechanical properties of each suture material are also compared. Ten samples were mechanically tested for each suture and knot using a uniaxial tensile test until complete sample rupture. The failure Cauchy stress and stretch were calculated. The Cauchy stress at 5%, 10% and 15% strain and standard deviation were compared for each suture and knot type. The results demonstrated that all the suture materials had statistically significant differences in their non-linear mechanical behavior. Absorbable monofilament glyconate was the most compliant suture with the greatest tensile strength, while absorbable braided polyglycolic acid was the stiffest. Regardless of the suture type used, the Miller?s knot had the greatest failure Cauchy stress and stretch, while the square, surgeon?s and square slipknot had the lowest. In all cases, the Miller?s knot was more compliant and had greater tensile strength than the other knots. The square knot, surgeon?s knot, and square slipknot had statistically significant similarities in their mechanical behavior. Therefore, the Miller?s knot could be classified as the gold standard and an alternative to the surgical knotting. PMID:25058024

  19. In-the-bag scleral suturing of intraocular lens in eyes with severe zonular dehiscence

    PubMed Central

    Hayashi, K; Hirata, A; Hayashi, H

    2012-01-01

    Purpose To compare the degree of tilt and decentration of an intraocular lens (IOL), refractive status, and prediction error between eyes that underwent trans-scleral suturing of the IOL within the capsular bag (in-the-bag scleral suturing) and eyes that underwent scleral suturing outside of the bag (out-of-the-bag scleral suturing) because of severe zonular dehiscence. Patients and methods Thirty eyes that underwent in-the-bag scleral suturing of an IOL and 38 eyes that underwent out-of-the-bag scleral suturing were recruited sequentially. The tilt and decentration of the IOL, anterior chamber depth, manifest refractive spherical equivalent (MRSE), prediction error, and incidence of complications were examined. Results The mean tilt angle and the decentration length of the IOL of the in-the-bag suturing group were significantly less than those of the out-of-the-bag suturing group (P=0.0003 in tilt and P=0.0391 in decentration), although the anterior chamber depth was similar. The mean MRSE and prediction error of the in-the-bag suturing group were less than those of the out-of-the-bag suturing group (P=0.0006 in MRSE and P=0.0034 in error). The incidence of vitreous loss was less in the in-the-bag suturing group than in the out-of-the-bag suturing group (20% vs63.2%, P=0.0009). Conclusions The tilt and decentration of the IOL after in-the-bag scleral suturing are significantly less than those after out-of-the-bag scleral suturing, which may lead to less MRSE and less prediction error. As the incidence of vitreous loss is less after in-the-bag scleral suturing, in-the-bag suturing is advantageous for eyes of younger patients and of less complicated cases. PMID:21941359

  20. Comparison of the cheese-wiring effects among three sutures used in rotator cuff repair

    PubMed Central

    Lambrechts, Mark; Nazari, Behrooz; Dini, Arash; O'Brien, Michael J.; Heard, Wendell M. R.; Savoie, Felix H.; You, Zongbing

    2014-01-01

    Purpose: The goal of this study was to compare the cheese-wiring effects of three sutures with different coefficients of friction. Materials and Methods: Sixteen human cadaveric shoulders were dissected to expose the distal supraspinatus and infraspinatus muscle tendons. Three sutures were stitched through the tendons: #2 Orthocord™ suture (reference #223114, DePuy Mitek, Inc., Raynham, MA), #2 ETHIBOND* EXCEL Suture, and #2 FiberWire® suture (FiberWire®, Arthrex, Naples, FL). The sutures were pulled by cyclic axial forces from 10 to 70 N at 1 Hz for 1000 cycles through a MTS machine. The cut-through distance on the tendon was measured with a digital caliper. Results: The cut-through distance in the supraspinatus tendons (mean ± standard deviation, n = 12) were 2.9 ± 0.6 mm for #2 Orthocord™ suture, 3.2 ± 1.2 mm for #2 ETHIBOND* suture, and 4.2 ± 1.7 mm for #2 FiberWire® suture. The differences were statistically significant analyzing with analysis of variance (P = 0.047) and two-tailed Student's t-test, which showed significance between Orthocord™ and FiberWire® sutures (P = 0.026), but not significant between Orthocord™ and ETHIBOND* sutures (P = 0.607) or between ETHIBOND* and FiberWire® sutures (P = 0.103). Conclusion: The cheese-wiring effect is less in the Orthocord™ suture than in the FiberWire® suture in human cadaveric supraspinatus tendons. Clinical Relevance: Identification of sutures that cause high levels of tendon cheese-wiring after rotator cuff repair can lead to better suture selection. PMID:25258499

  1. Complexity of suture zones:Example from the Yarlung Zangbo Suture Zone , southern Tibet. (Invited)

    NASA Astrophysics Data System (ADS)

    Hebert, R.; Guilmette, C.

    2013-12-01

    Decade-long investigation of the Yarlung Zangbo Suture Zone (YZSZ), southern Tibet, has revealed it's high complexity in terms of structure, geochronology and metamorphic and igneous histories. For instance, YZSZ comprises Late Devonian to mid-Miocene rocks, metamorphic intensities vary from high-grade to very-low grade and deformation styles range from ductile to brittle. Late Devonian rocks (363.7 × 1.7 Ma) are alkalic gabbros resulting from activity of a plume active within the Paleo-Tethys basin. Two ophiolite sub-groups are recognized. Sub-group 1 is Mid- to Late Jurassic (150-177 Ma) in age and ill-defined because only few sequences have been found and studied so far. IThis sub-group is probably derived from the destruction of a marginal basin comprising intra-oceanic arc and fore-arc settings. Spontang and Zedong sequences are good examples of this sub-group. Sub-group 2 is Lower Cretaceous (120-130 Ma) and represents the destruction of a marginal basin comprising an arc-back-arc system. These ophiolites are spatially associated with ophiolitic mélanges and flysch respectively representing the reworking of the Cretaceous ophiolites and Indian continental margin and the Neo-Tethyan ocean floor although such affinities need clarification. Most ophiolitic sequences belong to sub-group 2 such as Xiugubagu, Saga, Xigaze. Amphibolite and garnet amphibolite blocks (123-130 Ma) found within the ophiolitic mélange share similar geochemical attributes with sub-group 2 ophiolites. Their protoliths were probably generated within back-arc spreading center and metamorphosed in a subduction zone at depth around 50 km. Some radiometric ages suggest events at 80 Ma and 90 old represent the entry of Indian continental margin into the intra-oceanic subduction zone and/or obduction of ophiolites. However these ages seem to be very rare throughout the whole suture zone and are therefore considered as resulting from local metamorphic events. Some alkaline igneous rocks (131-144 Ma) within the flysch could represent Kerguelen OIB plume products. The study of igneous blocks and the sedimentary matrix suggests a continuous passive margin model. The Miocene (11-17 Ma) post-collisional ultrapotassic rocks discovered in 2006-2007 result from the collapse of the Tibet Plateau accommodated by E-W extensional regime. They carry crustal xenoliths of metamorphic origins representing a window through the deep crustal section underlying the YZSZ. The geochemistry of these shoshonitic intrusives shows strong subduction components resulting from the metasomatism of the mantle wedge over the subduction zones accommodating the closure of Neo-Tethys basin. ?Nd values suggest the source reservoir for these magmatic rocks has mostly Asian late Precambrian affinity. YZSZ contains features related to the interplay between India and Eurasian plates once separated by the large Tethys Ocean or one of associated smaller basin such as the Neo-Tethys basin. However, the complexity of the YZSZ and the diversity of rock types call for a redefinition of the suture zone to include such a mosaic of terranes now tectonically adjacent within this narrow orogenic collisional zone.

  2. Unravelling the molecular control of calvarial suture fusion in children with craniosynostosis

    Microsoft Academic Search

    Anna K Coussens; Christopher R Wilkinson; Ian P Hughes; C Phillip Morris; Angela van Daal; Peter J Anderson; Barry C Powell

    2007-01-01

    BACKGROUND: Craniosynostosis, the premature fusion of calvarial sutures, is a common craniofacial abnormality. Causative mutations in more than 10 genes have been identified, involving fibroblast growth factor, transforming growth factor beta, and Eph\\/ephrin signalling pathways. Mutations affect each human calvarial suture (coronal, sagittal, metopic, and lambdoid) differently, suggesting different gene expression patterns exist in each human suture. To better understand

  3. Suture Materials: Do They Affect Fistula and Stricture Rates in Flap Urethroplasties?

    Microsoft Academic Search

    M. Cimador; M. Castagnetti; M. Milazzo; M. Sergio; E. De Grazia

    2004-01-01

    Introduction: The effect of suture materials on urethroplasty complications is debated. Indeed, materials with a delayed absorption might either reduce the incidence of fistulas by ensuring a prolonged approximation of neo-urethral edges or increase the risk of urethral strictures due to a prolonged tissue reaction during suture absorption. We retrospectively evaluated the role of suture materials in the complication rate

  4. Identification and dynamics of a cryptic suture zone in tropical rainforest

    Microsoft Academic Search

    C. Moritz; C. J. Hoskin; J. B. MacKenzie; B. L. Phillips; M. Tonione; N. Silva; J VanDerWal; S. E Williams; C. H Graham

    2009-01-01

    Suture zones, shared regions of secondary contact between long-isolated lineages, are natural laboratories for studying divergence and speciation. For tropical rainforest, the existence of suture zones and their significance for speciation has been controversial. Using comparative phylogeographic evidence, we locate a morphologically cryptic suture zone in the Australian Wet Tropics rainforest. Fourteen out of 18 contacts involve morphologically cryptic phylogeographic

  5. Barbed Suture for Vaginal Cuff Closure in Laparoscopic Hysterectomy

    PubMed Central

    Medina, Byron Cardoso; Riaño, Giovanni; Hoyos, Luis R.; Otalora, Camila

    2014-01-01

    Background and Objectives: Our aim was to evaluate whether the use of barbed suture for vaginal cuff closure is associated with a decrease in postoperative vaginal bleeding compared with cuff closure with polyglactin 910 in patients who have undergone laparoscopic hysterectomy. Methods: We performed a cohort study of patients who underwent laparoscopic hysterectomy between January 2008 and July 2012 by the minimally invasive gynecologic surgery division of the Gynecology, Obstetrics and Human Reproduction Department at Fundación Santa Fe de Bogotá University Hospital, Bogotá, Colombia. Results: A total of 232 women were studied: 163 were in the polyglactin 910 group, and 69 were in the barbed suture group. The main outcome, postoperative vaginal bleeding, was documented in 53 cases (32.5%) in the polyglactin 910 group and in 13 cases (18.8%) in the barbed suture group (relative risk, 0.57; 95% confidence interval, 0.34–0.9; P = .03). No statistically significant differences were found in other postoperative outcomes, such as emergency department admission, vaginal cuff dehiscence, infectious complications, and the presence of granulation tissue. Conclusion: In this study an inverse association was observed between the use of barbed suture for vaginal cuff closure during laparoscopic hysterectomy and the presence of postoperative vaginal bleeding. PMID:24680149

  6. New adjustable suture technique for managing eyelid ptosis.

    PubMed

    Borman, H

    2001-12-01

    The challenge of accurately predicting eyelid height after levator surgery for ptosis is a well-known problem even in competent hands. It is always better to correct an unfavorable postoperative result without surgical intervention, and thus spare the patient another involved procedure. The author describes a new adjustable suture technique that ensures a secure connection between the levator muscle and the tarsus, and allows easy postoperative adjustment of lid height. The suture design consists of an inner and an outer loop in a configuration that resembles a paper clip. When the suture is tightened, the inner loop approximates the distal part of the levator muscle to the tarsal plate, bringing the tissues into secure contact. When tightened further, the outer loop is activated and it approximates the more proximal part of the levator muscle to the tarsus as much as desired to achieve the proper eyelid height. When the sutures are tightened, the levator muscle shortens by folding on itself like the pleats of an accordion. Using this method, muscle slack is reduced as the tissue is folded on itself several times. PMID:11756841

  7. Angiogenesis and osteogenesis in an orthopedically expanded suture

    NASA Technical Reports Server (NTRS)

    Chang, H. N.; Garetto, L. P.; Potter, R. H.; Katona, T. R.; Lee, C. H.; Roberts, W. E.

    1997-01-01

    The purpose of this study was to examine the angiogenic and the subsequent osteogenic responses during a 96-hour time-course after sutural expansion. Fifty rats were divided into: (1) a control group that received only angiogenic induction through injection of 5 ng/gm recombinant human endothelial cell growth factor (rhECGF); (2) an experimental group that received orthopedic expansion and rhECGF; (3) a sham group that received expansion and sodium chloride (NaCl) injection; and (4) a baseline group that received no expansion or injection. All rats were injected with 3H-thymidine (1.0 microCi/gm) 1 hour before death to label the DNA of S-phase cells. Demineralized sections (4 microm thick) were stained with hematoxylin and eosin. Angiogenesis and cell migration were analyzed with a previously established cell kinetics model. Analysis of variance was used to test the hypothesis that enhancement of angiogenesis stimulates reestablishment of osteogenic capability. Blood vessel number, area, and endothelial cell-labeled index significantly increased in experimental groups, but no difference was found between control and baseline groups. Labeled-pericyte index and activated pericyte numbers in the experimental group were also higher than in the sham groups. These results show that supplemental rhECGF enhances angiogenesis in expanded sutures but not in nonexpanded sutures. Data also suggest that pericytes are the source of osteoblasts in an orthopedically expanded suture.

  8. Flap Donor Site Size Reduction with Substratum Horizontal Mattress Suture

    PubMed Central

    Jalilimanesh, Mohammad

    2013-01-01

    BACKGROUND Closure of donor site of the flap has special problems. Reduction of this site will decrease the morbidity of operation. In this study, we present our experience in donor site size reduction. METHODS Between 2006 and 2008, 15 patients with skin and soft tissue defects underwent operation. In all patients, coverage of defect was performed with various flaps. Substratum horizontal mattress suture was used to reduce donor site dimensions. In all 15 patients, size of the flaps, the defect after the flap elevation and the scar size were measured. RESULTS The mean size of the flap, the defect after flap elevation, and the scar after 3 months were 43.9 cm2, 69.4 cm2, and 32.2 cm2, respectively. There was 46.5% reduction in the donor site after using this suture. CONCLUSION The substratum horizontal mattress suture was shown to de- crease the donor site dimensions and also its scar size in flap surgery. This suture is highly recommend in order to reduce donor site dimensions. PMID:25489499

  9. Shock absorber control system

    SciTech Connect

    Nakano, Y.; Ohira, M.; Ushida, M.; Miyagawa, T.; Shimodaira, T.

    1987-01-13

    A shock absorber control system is described for controlling a dampening force of a shock absorber of a vehicle comprising: setting means for setting a desired dampening force changeable within a predetermined range; drive means for driving the shock absorber to change the dampening force of the shock absorber linearly; control means for controlling the drive means in accordance with the desired dampening force when the setting of the desired dampening force has been changed; detecting means for detecting an actual dampening force of the shock absorber; and correcting means for correcting the dampening force of the shock absorber by controlling the drive means in accordance with a difference between the desired dampening force and the detected actual dampening force.

  10. Externally tuned vibration absorber

    DOEpatents

    Vincent, Ronald J. (Latham, NY)

    1987-09-22

    A vibration absorber unit or units are mounted on the exterior housing of a hydraulic drive system of the type that is powered from a pressure wave generated, e.g., by a Stirling engine. The hydraulic drive system employs a piston which is hydraulically driven to oscillate in a direction perpendicular to the axis of the hydraulic drive system. The vibration absorbers each include a spring or other resilient member having one side affixed to the housing and another side to which an absorber mass is affixed. In a preferred embodiment, a pair of vibration absorbers is employed, each absorber being formed of a pair of leaf spring assemblies, between which the absorber mass is suspended.

  11. Modelling Absorbent Phenomena of Absorbent Structure

    NASA Astrophysics Data System (ADS)

    Sayeb, S.; Ladhari, N.; Ben Hassen, M.; Sakli, F.

    Absorption, retention and strike through time, as evaluating criteria of absorbent structures quality were studied. Determination of influent parameters on these criteria were realized by using the design method of experimental sets. In this study, the studied parameters are: Super absorbent polymer (SAP)/fluff ratio, compression and the porosity of the non woven used as a cover stock. Absorption capacity and retention are mostly influenced by SAP/fluff ratio. However, strike through time is affected by compression. Thus, a modelling of these characteristics in function of the important parameter was established.

  12. Name: Carneiro Question: In patients requiring tooth extraction, will suturing, as compared to not suturing, result in better

    E-print Network

    Goldman, Steven A.

    , there was a statistically significant difference in swelling between the two groups. Pasqualini D Clinical Trial Randomized of postoperative pain and swelling on nonsuturing versus suturing but I would still need more randomized control Randomized Controlled Trial Sutureless group had a significantly lesser amount of pain and swelling

  13. Suture material for flexor tendon repair: 3–0 V-Loc versus 3–0 Stratafix in a biomechanical comparison ex vivo

    PubMed Central

    2014-01-01

    Background Barbed suture material offers the possibility of knotless flexor tendon repair, as suggested in an increasing number of biomechanical studies. There are currently two different absorbable barbed suture products available, V-Loc™ and Stratafix™, and both have not been compared to each other with regard to flexor tendon repair. The purpose of this study was to evaluate both suture materials for primary stability under static and cyclic loading in a biomechanical ex vivo model. Methods Forty fresh porcine flexor digitorum profundus tendons were randomized in two groups. A four-strand modified Kessler suture technique was used to repair the tendon either with a 3–0 V-Loc™ or 3–0 Stratafix™ without a knot. Parameters of interest were mode of failure, 2-mm gap formation force, displacement, stiffness and maximum load under static and cyclic testing. Results The maximum load was 42.3?±?7.2 for the Stratafix™ group and 50.7?±?8.8 N for the V-Loc™ group. Thus, the ultimate tensile strength was significantly higher for V-Loc™ (p?suture for knotless flexor tendon repair. PMID:25205062

  14. Hands-on Activities for understanding Ammonite Sutures

    NSDL National Science Digital Library

    Clint Cowan

    There is a lot of primary literature on the origin (and purpose) of complex sutures in ammonites. It is still hotly debated what (if any) benefit complex sutures may have imparted to ammonites. But to start this whole topic (which results in an essay on whether changes in sutures represent a passive or driven trend), I use a set of hands-on exercises that are fun and eye-opening: examining cross-sections through modern nautilus shells, making a play-doh model of an ammonite, and using a Hele-Shaw cell experiment to make complex dendritic shapes. I have found over the years, that students (and my faculty colleagues, too) can easily point out sutures to me on the ammonite fossils in our collection, but they really don't know what they're pointing to (they honestly don't!). So, I split my students (I usually have around 30 in my 200-level Paleobiology course) into teams of three, and we do several things (I do this all in one 4-hour lab, but you could easily do these in separate periods). First, they get an ammonite fossil (always a sediment-filled specimen with the mother of pearl phragmacone at least mostly gone so some of the sutures are clearly visible), and a couple of modern nautilus shells cut in half (I purchase these online from seashellcity.com), and some play-doh (little 2-oz different color tubs I get from Kmart). They have to determine, and then build a model (using play-doh), what they're looking at when they're looking at the ammonite fossils, in particular, the sutures (sans sediment). They are allowed to look stuff up online or in their text. Results are amazing. I've had many teams build a very nice ammonite (usually a tube of play-doh, representing just one chamber with two septal walls at either end of the tube) and then they use a pencil to sketch the sutures on the outside of the phragmacone! I tell them to rethink this and then they work on it more... It's really cool when they finally realize that to make a model of the fossil sutures that they're looking at, they need to peel off their play-doh phragmacone to reveal the sutures (which are just the 1D line at the end of a 2D septal plane) (although the actual 1D 2D thing gets interesting when we delve into the fractal nature of the sutures, see below). Also, the modern nautilus shells beautifully show the difference between growth lines and sutures/septa. So I augment my assessment of their understanding by literally having each student individually trace for me (with their finger) what the suture is on one of the nautilus shells, and what a growth line is (the supplier I use polishes off the periostracum to reveal the mother of pearl with obvious growth lines). I have also taken whole Nautilus shells and buffed off a part of the phragmacone to reveal the edge of the septal wall, which is the exact equivalent of a suture in an ammonite). Then, we run a Hele-Shaw experiment to get viscous fingering (which resembles ammonite sutures). I borrowed this hele-shaw design from the Center for Polymer Studies at Boston University (http://polymer.bu.edu/edu/) Exploring Patterns in Nature. It consists of a pair of ~10-inch square glass plates, one with a hole drilled in it (our Shop makes these for me from standard glass). The hole is a size that fits common plastic tubing (outside diameter) which in turn fits a standard small syringe inside the tubing. The experiment works like this: put a 3 to 5 inch long piece of plastic tube in the hole, but make sure it doesn't stick out the other side (not more than flush), and seal this with some sort of removable sealant; let the sealant stiffen, and clean both plates with windex. Then, on the solid plate, put two stacked thin-section cover slips (I use micro glass little slips) at the corners of the plate, then put the hole-plate with tube up, on top of the cover slips (the inside surfaces need to be very clean), then clip the two plates together with binder clips on each corner. This is a Hele-Shaw cell. Then, with the syringe, inject glycerol between the plates, careful not to put too much in that is squirts out the

  15. Timing of ectocranial suture activity in Gorilla gorilla as related to cranial volume and dental eruption.

    PubMed

    Cray, James; Cooper, Gregory M; Mooney, Mark P; Siegel, Michael I

    2011-05-01

    Research has shown that Pan and Homo have similar ectocranial suture synostosis patterns and a similar suture ontogeny (relative timing of suture fusion during the species ontogeny). This ontogeny includes patency during and after neurocranial expansion with a delayed bony response associated with adaptation to biomechanical forces generated by mastication. Here we investigate these relationships for Gorilla by examining the association among ectocranial suture morphology, cranial volume (as a proxy for neurocranial expansion) and dental development (as a proxy for the length of time that it has been masticating hard foods and exerting such strains on the cranial vault) in a large sample of Gorilla gorilla skulls. Two-hundred and fifty-five Gorilla gorilla skulls were examined for ectocranial suture closure status, cranial volume and dental eruption. Regression models were calculated for cranial volumes by suture activity, and Kendall's tau (a non-parametric measure of association) was calculated for dental eruption status by suture activity. Results suggest that, as reported for Pan and Homo, neurocranial expansion precedes suture synostosis activity. Here, Gorilla was shown to have a strong relationship between dental development and suture activity (synostosis). These data are suggestive of suture fusion extending further into ontogeny than brain expansion, similar to Homo and Pan. This finding allows for the possibility that masticatory forces influence ectocranial suture morphology. PMID:21385182

  16. Cranial sutures work collectively to distribute strain throughout the reptile skull

    PubMed Central

    Curtis, Neil; Jones, M. E. H.; Evans, S. E.; O'Higgins, P.; Fagan, M. J.

    2013-01-01

    The skull is composed of many bones that come together at sutures. These sutures are important sites of growth, and as growth ceases some become fused while others remain patent. Their mechanical behaviour and how they interact with changing form and loadings to ensure balanced craniofacial development is still poorly understood. Early suture fusion often leads to disfiguring syndromes, thus is it imperative that we understand the function of sutures more clearly. By applying advanced engineering modelling techniques, we reveal for the first time that patent sutures generate a more widely distributed, high level of strain throughout the reptile skull. Without patent sutures, large regions of the skull are only subjected to infrequent low-level strains that could weaken the bone and result in abnormal development. Sutures are therefore not only sites of bone growth, but could also be essential for the modulation of strains necessary for normal growth and development in reptiles. PMID:23804444

  17. Histologic evaluation of absorbable and non-absorbable barrier coated mesh secured to the peritoneum with fibrin sealant in a New Zealand white rabbit model

    PubMed Central

    Jenkins, E. D.; Melman, L.; Desai, S.; Deeken, C. R.; Greco, S. C.; Frisella, M. M.; Matthews, B. D.

    2013-01-01

    Purpose The purpose of this study is to evaluate the histologic response to fibrin sealant (FS) as an alternative fixation method for laparoscopic ventral hernia repair. Methods One non-absorbable barrier mesh (Composix™) and three absorbable barrier meshes (Sepramesh™, Proceed™, and Parietex™ Composite) were used for the study, with uncoated macroporous polypropylene mesh (ProLite Ultra™) as the control. Three methods of fixation were used: #0-polypropylene suture? FS (ARTISS™, Baxter Healthcare Corp.), FS alone (ARTISS™), or tacks alone (n = 10 for each group). Two pieces of mesh (of dimensions 4 × 4-cm) were secured intraperitoneally in 75 New Zealand white rabbits. After 8 weeks, hematoxylin and eosin (H&E)-stained specimens were evaluated for host tissue response. Statistical significance (P < 0.05) was determined using a one-way analysis of variance (ANOVA) with Fisher’s least significant difference (LSD) post hoc test. Results Composix™ with FS only showed significantly greater cellular infiltration than with suture? FS (P = 0.0007), Proceed™ with FS only had significantly greater neovascularization than with suture? FS (P = 0.0172), and ProLite Ultra™ with suture? FS had significantly greater neovascularization than with tacks only (P = 0.046). Differences due to mesh type showed that Composix™ exhibited less extensive cellular infiltration (P ? 0.0032), extracellular matrix (ECM) deposition, and neovascularization, and demonstrated less inflammatory cells and more fibroblasts compared to the other meshes (P < 0.05). Conclusions FS did not have a significant histologic effect compared to tacks when utilized for the fixation of mesh to the peritoneum of New Zealand White rabbits. However, the mesh type did have a significant histologic effect. The permanent barrier mesh (Composix™) was associated with less histologic incorporation than absorbable barrier and macroporous meshes, as evidenced by lower levels of cellular infiltration, ECM deposition, and neovascularization, independent of the fixation method used. PMID:21607571

  18. Electromagnetic shock absorber

    Microsoft Academic Search

    S. Mirzaei; S. M. Saghaiannejad; V. Tahani; M. Moallem

    2001-01-01

    This paper introduces a novel passive suspension system for ground vehicles. The system is based a flexible electromagnetic shock absorber (EMSA). In the proposed system, it is attempted: (a) to select a variable high damping coefficient usable in a car; (b) physical dimensions and the geometry of EMSA not to be very different from mechanical shock absorbers; and (c) its

  19. Advanced neutron absorber materials

    DOEpatents

    Branagan, Daniel J. (Idaho Falls, ID); Smolik, Galen R. (Idaho Falls, ID)

    2000-01-01

    A neutron absorbing material and method utilizing rare earth elements such as gadolinium, europium and samarium to form metallic glasses and/or noble base nano/microcrystalline materials, the neutron absorbing material having a combination of superior neutron capture cross sections coupled with enhanced resistance to corrosion, oxidation and leaching.

  20. A new wound closure achieving and maintaining device using serial tightening of loop suture and its clinical applications in 15 consecutive patients for up to 102 days.

    PubMed

    Lee, Eui-Tai

    2004-11-01

    A device that can both achieve and maintain wound closure by serial tightening of a loop suture was developed. The device consists of 3 components: a hollow plastic cylinder with a 1-way locking mechanism, a flat plastic strip passing though the cylinder, and a plastic cushion between the cylinder and the skin. The body of the device is composed of a soft cylinder and a hard strip. This difference in flexibility enables the device to absorb impacts of positional changes and daily activities, while the device preserves tension of loop suture and wound closure ().(Figure is included in full-text article.)After debridement or excision of a lesion, the passage of 0-1 nylon suture is designed. The nylon suture is threaded through the deep dermis across the wound. Both ends of the suture are then tied to make a loop, which is secured to 2 holes at one end of a plastic strip. The plastic strip, which holds the loop suture, is pulled away from the skin gradually through a hollow plastic cylinder to approximate wound margins ().(Figure is included in full-text article.)From January 2003 to August 2003, the device was applied 21 times in 15 consecutive patients. A mean stretching of 42.0 mm was performed for defects with a mean shortest dimension of 24.5 mm (from 2 mm to 60 mm). All 21 wounds were closed primarily (21/21 = 100%), and the closure was maintained successfully for 18 wounds (18/21 = 85.7%) in 13 patients (13/15 = 86.7%). The device was left in situ for as long as 102 days (average application time of 34.5 days). Three wound dehiscences (3/21 = 14.3%) occurred in 2 diabetic foot patients, which were cured by skin grafting. In 2 sacral pressure ulcer patients, minimal skin lacerations were caused by the loop sutures at the skin entrance site but without true wound dehiscence. These lacerations healed with minimal debridement and routine wound dressing within 2 weeks. This instrument was devised to overcome the limitations of previous skin stretching methods. It has wider indications and shows better compliances. In particular, because of its longer period of application, the device does not only stretch the skin to achieve wound closure, but also helps maintain it during wound healing. PMID:15502458

  1. Arthroscopic Lateral Meniscus Root Repair With Soft Suture Anchor Technique

    PubMed Central

    Prasathaporn, Niti; Kuptniratsaikul, Somsak; Kongrukgreatiyos, Kitiphong

    2013-01-01

    Meniscus root tear leads to circumferential hoop tension loss and increases femorotibial contact force, which causes irreversible cartilage degeneration. Biomechanical studies have shown that meniscus root repair provides better femorotibial contact force than meniscectomy. Many techniques for meniscus root repair have been published in recent years. The soft suture anchor is widely used in the glenoid labral repair. It is a small low-profile soft anchor. This article presents a new and simple technique of lateral meniscus root repair using the small soft anchor, which results in an anatomic and more vertical anchor position. It avoids instrument-related complications, such as cartilage delamination, material reaction, metal retention, and hard suture anchor pullout. PMID:24892012

  2. Complications of bioabsorbable suture anchors in the shoulder.

    PubMed

    Dhawan, Aman; Ghodadra, Neil; Karas, Vasili; Salata, Michael J; Cole, Brian J

    2012-06-01

    The development of the suture anchor has played a pivotal role in the transition from open to arthroscopic techniques of the shoulder. Various suture anchors have been manufactured that help facilitate the ability to create a soft tissue to bone repair. Because of reported complications of loosening, migration, and chondral injury with metallic anchors, bioabsorbable anchors have become increasingly used among orthopaedic surgeons. In this review, the authors sought to evaluate complications associated with bioabsorbable anchors in or about the shoulder and understand these in the context of the total number of bioabsorbable anchors placed. In 2008, 10 bioabsorbable anchor-related complications were reported to the US Food and Drug Administration. The reported literature complications of bioabsorbable anchors implanted about the shoulder include glenoid osteolysis, synovitis, and chondrolysis. These potential complications should be kept in mind when forming a differential diagnosis in a patient in whom a bioabsorbable anchor has been previously used. These literature reports, which amount to but a fraction of the total bioabsorbable anchors implanted in the shoulder on a yearly basis, underscore the relative safety and successful clinical results with use of bioabsorbable suture anchors. Product development continues with newer composites such as PEEK (polyetheretherketone) and calcium ceramics (tricalcium phosphate) in an effort to hypothetically create a mechanically stable construct with and improve biocompatibility of the implant. Bioabsorbable anchors remain a safe, reproducible, and consistent implant to secure soft tissue to bone in and about the shoulder. Meticulous insertion technique must be followed in using bioabsorbable anchors and may obviate many of the reported complications found in the literature. The purpose of this review is to provide an overview of the existing literature as it relates to the rare complications seen with use of bioabsorbable suture anchors in the shoulder. PMID:21856927

  3. Histological findings in sutured and fibrin-glued microvascular anastomosis.

    PubMed

    Brunner, F X

    1984-01-01

    A new method of microvascular anastomosis is presented. A sufficient sutureless telescoping anastomosis was achieved using fibrin adhesive (Tissucol, Immuno GmbH, Heidelberg, FRG) and a Fogarty embolectomy catheter (American Hospital Supply, Deutschland GmbH, Munich, FRG) as an internal splint in the abdominal aorta of Sprague-Dawley rats. The main advantage of this technique is its short application time. Histological examinations mostly showed accelerated healing compared with sutured anastomosis. PMID:6385941

  4. Internal absorber solar collector

    DOEpatents

    Sletten, Carlyle J. (106 Nagog Hill Rd., Acton, MA 01720); Herskovitz, Sheldon B. (88 Hammond St., Acton, MA 01720); Holt, F. S. (46 Emerson Rd., Winchester, MA 01890); Sletten, E. J. (Chestnut Hill Rd. R.F.D. Rte. #4, Amherst, NH 03031)

    1981-01-01

    Thin solar collecting panels are described made from arrays of small rod collectors consisting of a refracting dielectric rod lens with an absorber imbedded within it and a reflecting mirror coated on the back side of the dielectric rod. Non-tracking collector panels on vertical walls or roof tops receive approximately 90% of solar radiation within an acceptance zone 60.degree. in elevation angle by 120.degree. or more in the azimuth sectors with a collector concentration ratio of approximately 3.0. Miniaturized construction of the circular dielectric rods with internal absorbers reduces the weight per area of glass, plastic and metal used in the collector panels. No external parts or insulation are needed as heat losses are low due to partial vacuum or low conductivity gas surrounding heated portions of the collector. The miniature internal absorbers are generally made of solid copper with black selective surface and the collected solar heat is extracted at the collector ends by thermal conductivity along the absorber rods. Heat is removed from end fittings by use of liquid circulants. Several alternate constructions are provided for simplifying collector panel fabrication and for preventing the thermal expansion and contraction of the heated absorber or circulant tubes from damaging vacuum seals. In a modified version of the internal absorber collector, oil with temperature dependent viscosity is pumped through a segmented absorber which is now composed of closely spaced insulated metal tubes. In this way the circulant is automatically diverted through heated portions of the absorber giving higher collector concentration ratios than theoretically possible for an unsegmented absorber.

  5. Tectonics of the South Anyui Suture, Northeastern Asia

    NASA Astrophysics Data System (ADS)

    Sokolov, S. D.; Tuchkova, M. I.; Ganelin, A. V.; Bondarenko, G. E.; Layer, P.

    2015-01-01

    The South Anyui Suture separates the structures of the Chukotka and Verkhoyansk-Kolyma Fold Areas. The suture consists of ophiolites, island-arc rocks, deformed Upper Triassic and Upper Jurassic-Lower Cretaceous turbidites, and accretionary-type terrigenous melange with blocks of oceanic crust. Two main stages in the geological history of the South Anyui Suture are distinguished: (1) the oceanic stage (Paleozoic-onset of Late Jurassic), when the vast Protoarctic ocean with ensimatic island arcs existed, and (2) the collisional stage (Volgian Age-Early Cretaceous) that started with the transformation of the ocean into the residual and closing South Anyui turbidite basin and was completed by the formation of a fold-nappe structure in the Hauterivian-Barremian. In the course of collision, the oceanic and island complexes were thrust to the north over the passive margin of Chukchi Peninsula. The thrusting was followed by the formation of south-vergent retrocharriages and then by final strike-slip faulting. In the Aptian-Albian, collision gave way to extension with the formation of metamorphic cores and superposed orogenic basins.

  6. Healing of the Goat Anterior Cruciate Ligament After a New Suture Repair Technique and Bioscaffold Treatment

    PubMed Central

    Geel, Jurre; Schulze, Martin; Raschke, Michael J.; Woo, Savio L-Y.; van Dijk, C. Niek; Blankevoort, Leendert

    2013-01-01

    Primary suture repair of the anterior cruciate ligament (ACL) has been used clinically in an attempt to heal the ruptured ACL. The results, however, were not satisfactory, which in retrospect can be attributed to the used suturing technique and the suboptimal healing conditions. These constraining conditions can be improved by introducing a new suturing technique and by using small intestinal submucosa (SIS) as a bioscaffold. It is hypothesized that the suturing technique keep the torn ends together and that SIS enhance and promote the healing of the ACL. The goat was used as the study model. In the Suture group, the left ACL was transected and suture repaired with a new locking suture repair technique (n=5) allowing approximation and fixation under tension. The Suture-SIS group underwent the same procedure with the addition of SIS (n=5). The right ACL served as control. After 12 weeks of healing, anterior–posterior translation and in situ force of the healing ACL were measured, followed by the measurement of the cross-sectional area and structural stiffness. Routine histology was performed on tissue samples. Gross morphology showed that the healing ACL was continuous with collagenous tissue in both groups. The cross-sectional area of the Suture and the Suture-SIS group was 35% and 50% of the intact control, respectively. The anterior–posterior translations at different flexion angles were statistically not different between the Suture group and the Suture-SIS group. Only the in situ force at 30° in the Suture-SIS group was higher than in the Suture group. Tensile tests showed that the stiffness for the Suture group was not different from the Suture-SIS group (31.1±8.1?N/mm vs. 41.9±18.0?N/mm [p>0.05]). Histology showed longitudinally aligned collagen fibers from origo to insertion. More fibroblasts were present in the healing tissue than in the control intact tissue. The study demonstrated the proof of concept of ACL repair in a goat model with a new suture technique and SIS. The mechanical outcome is not worse than previously reported for ACL reconstruction. In conclusion, the approach of using a new suture technique, with or without a bioscaffold to heal the ACL is promising. PMID:23725556

  7. Drill string shock absorber

    SciTech Connect

    Anderson, E. A.; Webb, D. D.

    1985-11-12

    A telescopic shock absorber for use in a drill string includes a resilient arrangement to cushion telescopic contraction and extension of the shock absorber in response to shock loads and vibrations imparted during drilling. The shock absorber operates independently of the drilling fluid pressure conducted through the structure during drilling operations. A dampening system assists in cushioning the shock loads and vibrations and the dampening system and resilient arrangement are deactivated when jarring impacts are delivered to the well string by a drilling jar carried therein. The resilient arrangement provides a combination mechanical and hydraulic system for cushioning the impact loads and vibrations encountered.

  8. Lipid-absorbing Polymers

    NASA Technical Reports Server (NTRS)

    Marsh, H. E., Jr.; Wallace, C. J.

    1973-01-01

    The removal of bile acids and cholesterol by polymeric absorption is discussed in terms of micelle-polymer interaction. The results obtained with a polymer composed of 75 parts PEO and 25 parts PB plus curing ingredients show an absorption of 305 to 309%, based on original polymer weight. Particle size effects on absorption rate are analyzed. It is concluded that crosslinked polyethylene oxide polymers will absorb water, crosslinked polybutadiene polymers will absorb lipids; neither polymer will absorb appreciable amounts of lipids from micellar solutions of lipids in water.

  9. Bending and abrasion fatigue of common suture materials used in arthroscopic and open orthopedic surgery.

    PubMed

    Savage, Earle; Hurren, Christopher J; Slader, Simon; Khan, Lukman A K; Sutti, Alessandra; Page, Richard S

    2013-01-01

    In orthopedic surgery, the reattachment of tendon to bone requires suture materials that have stable and durable properties to allow time for healing at the tendon-bone interface. The suture, not rigidly restrained within the anchor eyelet, is free to move during surgery and potentially after surgery with limb motion. During such movement, the suture is subjected to bending and frictional forces that can lead to fatigue-induced failure. We investigated some common contemporary commercial number-two-grade suture materials and evaluated their resistance to bending abrasion fatigue and the consequent failure. Sutures were oscillated over a stainless steel wire at low frequency under load. Number of abrasion cycles to failure, changes in suture morphology, and fatigue-failure method was recorded for each material. Suture structure had a significant effect on abrasion resistance, with braided sutures containing large numbers of fine high tenacity core filaments performing 15-20 times better than other braided suture structures. Ultra high molecular weight polyethylene (UHMWPE) core filaments resisted bending abrasion failure better than other core materials due to the load spreading and abrasion resistance of these filaments. Sutures with UHMWPE cores also had high resistance to tensile failure. Limited correlation was observed between tensile strength and abrasion resistance. PMID:22777625

  10. Comparison of nylon and polypropylene sutures in a microvenous thrombosis model.

    PubMed

    Ustüner, T E; Zhang, F; Lineaweaver, W C

    1995-01-01

    Thrombosis rates of femoral end-to-end microvenous anastomoses with nylon and polypropylene sutures (9-0 suture, 70 mu needle) were compared in a microvenous thrombosis model. The vessel injuries were produced during anastomosis by using a suture with a knot 1 cm from the needle. Anastomotic thrombosis rates were assessed by visual inspection and strip test at 24 hr postoperatively. Low thrombosis rates (0% and 20%, respectively) of anastomoses with both unknotted nylon and unknotted polypropylene sutures were obtained. Anastomoses with knotted nylon and polypropylene sutures resulted in 65% and 45% thrombosis rates, respectively. Statistical analyses showed that there were no significant differences between thrombosis rates, both in anastomosis performance with unknotted nylon and polypropylene sutures (P > 0.05) and with knotted nylon and polypropylene sutures (P > 0.05), while there were significant differences between the thrombosis rate using unknotted sutures and knotted sutures (P < 0.01). It was concluded that vascular injury, not suture material, is the main factor leading to thrombosis in this model. PMID:8538429

  11. Ultrastructure, histochemistry, and mineralization patterns in the ecdysial suture of the blue crab, Callinectes sapidus.

    PubMed

    Priester, Carolina; Dillaman, Richard M; Gay, D Mark

    2005-12-01

    The ecdysial suture is the region of the arthropod exoskeleton that splits to allow the animal to emerge during ecdysis. We examined the morphology and composition of the intermolt and premolt suture of the blue crab using light microscopy and scanning electron microscopy. The suture could not be identified by routine histological techniques; however 3 of 22 fluorescein isothiocyanate-labeled lectins tested (Lens culinaris agglutinin, Vicia faba agglutinin, and Pisum sativum agglutinin) differentiated the suture, binding more intensely to the suture exocuticle and less intensely to the suture endocuticle. Back-scattered electron (BSE) and secondary electron observations of fracture surfaces of intermolt cuticle showed less mineralized regions in the wedge-shaped suture as did BSE analysis of premolt and intermolt resin-embedded cuticle. The prism regions of the suture exocuticle were not calcified. X-ray microanalysis of both the endocuticle and exocuticle demonstrated that the suture was less calcified than the surrounding cuticle with significantly lower magnesium and phosphorus concentrations, potentially making its mineral more soluble. The presence or absence of a glycoprotein in the organic matrix, the extent and composition of the mineral deposited, and the thickness of the cuticle all likely contribute to the suture being removed by molting fluid, thereby ensuring successful ecdysis. PMID:17481327

  12. Cranial Sutures and Bones: Growth and Fusion in Relation to Masticatory Strain

    PubMed Central

    SUN, ZONGYANG; LEE, EUGENIA; HERRING, SUSAN W.

    2010-01-01

    Cranial bones and sutures are mechanically loaded during mastication. Their response to masticatory strain, however, is largely unknown, especially in the context of age change. Using strain gages, this study investigated masticatory strain in the posterior interfrontal and the anterior interparietal sutures and their adjacent bones in 3- and 7-month-old miniature swine (Sus scrofa). Double-fluorochrome labeling of these animals and an additional 5-month group was used to reveal suture and bone growth as well as features of suture morphology and fusion. With increasing age, the posterior interfrontal suture strain decreased in magnitude and changed in pattern from pure compression to both compression and tension, whereas the interparietal suture remained in tension and the magnitude increased unless the suture was fused. Morphologically, the posterior interfrontal suture was highly interdigitated at 3 months and then lost interdigitation ectocranially in older pigs, whereas the anterior interparietal suture remained butt-ended. Mineralization apposition rate (MAR) decreased with age in both sutures and was unrelated to strain. Bone mineralization was most vigorous on the ectocranial surface of the frontal and the parietal bones. Unlike the sutures, with age bone strain remained constant while bone MARs significantly increased and were correlated with bone thickness. Fusion had occurred in the interparietal suture of some pigs. In all cases fusion was ectocranial rather than endocranial. Fusion appeared to be associated with increased suture strain and enhanced bone growth on the ectocranial surface. Collectively, these results indicate that age is an important factor for strain and growth of the cranium. PMID:14752854

  13. Absence of Endochondral Ossification and Craniosynostosis in Posterior Frontal Cranial Sutures of Axin2?/? Mice

    PubMed Central

    Behr, Björn; Longaker, Michael T.; Quarto, Natalina

    2013-01-01

    During the first month of life, the murine posterior-frontal suture (PF) of the cranial vault closes through endochondral ossification, while other sutures remain patent. These processes are tightly regulated by canonical Wnt signaling. Low levels of active canonical Wnt signaling enable endochondral ossification and therefore PF-suture closure, whereas constitutive activation of canonical Wnt causes PF-suture patency. We therefore sought to test this concept with a knockout mouse model. PF-sutures of Axin2?/? mice, which resemble a state of constantly activated canonical Wnt signaling, were investigated during the physiological time course of PF-suture closure and compared in detail with wild type littermates. Histological analysis revealed that the architecture in Axin2?/? PF-sutures was significantly altered in comparison to wild type. The distance between the endocranial layers was dramatically increased and suture closure was significantly delayed. Moreover, physiological endochondral ossification did not occur, rather an ectopic cartilage appeared between the endocranial and ectocranial bone layers at P7 which eventually involutes at P13. Quantitative PCR analysis showed the lack of Col10?1 upregulation in Axin2?/? PF-suture. Immunohistochemistry and gene expression analysis also revealed high levels of type II collagen as compared to type I collagen and absence of Mmp-9 in the cartilage of Axin2?/? PF-suture. Moreover, TUNEL staining showed a high percentage of apoptotic chondrocytes in Axin2?/? PF-sutures at P9 and P11 as compared to wild type. These data indicated that Axin2?/? PF-sutures lack physiological endochondral ossification, contain ectopic cartilage and display delayed suture closure. PMID:23936395

  14. Bundles of Spider Silk, Braided into Sutures, Resist Basic Cyclic Tests: Potential Use for Flexor Tendon Repair

    PubMed Central

    Hennecke, Kathleen; Redeker, Joern; Kuhbier, Joern W.; Strauss, Sarah; Allmeling, Christina; Kasper, Cornelia; Reimers, Kerstin; Vogt, Peter M.

    2013-01-01

    Repair success for injuries to the flexor tendon in the hand is often limited by the in vivo behaviour of the suture used for repair. Common problems associated with the choice of suture material include increased risk of infection, foreign body reactions, and inappropriate mechanical responses, particularly decreases in mechanical properties over time. Improved suture materials are therefore needed. As high-performance materials with excellent tensile strength, spider silk fibres are an extremely promising candidate for use in surgical sutures. However, the mechanical behaviour of sutures comprised of individual silk fibres braided together has not been thoroughly investigated. In the present study, we characterise the maximum tensile strength, stress, strain, elastic modulus, and fatigue response of silk sutures produced using different braiding methods to investigate the influence of braiding on the tensile properties of the sutures. The mechanical properties of conventional surgical sutures are also characterised to assess whether silk offers any advantages over conventional suture materials. The results demonstrate that braiding single spider silk fibres together produces strong sutures with excellent fatigue behaviour; the braided silk sutures exhibited tensile strengths comparable to those of conventional sutures and no loss of strength over 1000 fatigue cycles. In addition, the braiding technique had a significant influence on the tensile properties of the braided silk sutures. These results suggest that braided spider silk could be suitable for use as sutures in flexor tendon repair, providing similar tensile behaviour and improved fatigue properties compared with conventional suture materials. PMID:23613793

  15. Laparoscopic Transcystic Choledochotomy with Primary Suture for Choledocholith

    PubMed Central

    Zhu, Andong; Zhang, Zhibo

    2015-01-01

    Background and Objectives: To investigate the possibility of extracting common bile duct (CBD) stones by laparoscopically inserting choledochoscope through the natural orifice of the cystic duct and a mini-incision on the CBD, and the safety of laparoscopic primary double-layer suture of the cystic duct and CBD. Methods: Laparoscopic transcystic choledochotomy and extraction of stones with primary suture was performed on 194 patients with gallbladder and CBD stones from October 1, 2009, through April 30, 2012. The cystic duct was left at a diameter of 1 to 1.5 cm after removal of the gallbladder. The duct was longitudinally cut at its ventral side to the confluence with the CBD, and the anterior wall of the CBD was also cut longitudinally. A choledochoscope was then inserted via the enlarged opening, and the stones were extracted from the CBD. Finally, the CBD and cystic duct were closed by continuous mucous layer suture and seromuscular Lembert suture, respectively. The cystic duct was ligated close to the CBD and an abdominal drainage tube was placed. Results: All surgical procedures were successfully performed. The caliber at the confluence between the cystic duct and the CBD was 0.3 to 0.8 cm (SD 0.4 ± 0.1 cm), and the mini-incision of the CBD was 0.1 to 1.1 cm (SD 0.3 ± 0.2 cm). Abdominal drainage lasted 3 to 5 days. Magnetic resonance cholangiopancreatography (MRCP) in 55 patients showed no abnormal change in the CBD diameter. Two patients had bile leakage. Another patient had intermittent abdominal pain and jaundice 5 to 7 days postoperatively, and the retained stones spontaneously passed. The postoperative hospital stay was 6 to 13 days (SD 8 ± 2.1 days). Observation of 176 patients (90%) lasting 1 to 30 months (SD 11 ± 8 months) showed no recurrent stones or stricture of the CBD. Conclusion: The surgical procedure of laparoscopic transcystic choledochotomy and extraction of stones with primary suture is feasible and safe.

  16. Absorbance modulation optical lithography

    E-print Network

    Tsai, Hsin-Yu Sidney

    2007-01-01

    In this thesis, the concept of absorbance-modulation optical lithography (AMOL) is described, and the feasibility experimentally verified. AMOL is an implementation of nodal lithography, which is not bounded by the diffraction ...

  17. "Smart" Electromechanical Shock Absorber

    NASA Technical Reports Server (NTRS)

    Stokes, Lebarian; Glenn, Dean C.; Carroll, Monty B.

    1989-01-01

    Shock-absorbing apparatus includes electromechanical actuator and digital feedback control circuitry rather than springs and hydraulic damping as in conventional shock absorbers. Device not subject to leakage and requires little or no maintenance. Attenuator parameters adjusted in response to sensory feedback and predictive algorithms to obtain desired damping characteristic. Device programmed to decelerate slowly approaching vehicle or other large object according to prescribed damping characteristic.

  18. Auxiliary shock absorber assembly

    SciTech Connect

    Hetherington, T.G.

    1987-07-07

    This patent describes an auxiliary shock absorber assembly adapted to be secured to the frame of a vehicle and to the vehicle suspension system for providing additional shock absorption in the event of the vehicle impacts an irregularity in the roadway. The assembly comprises a shock absorber having a piston rod extending from one end and includes means disposed for biasing the piston rod outwardly; means carried by the shock absorber for securing the shock absorber to the frame of the vehicle such that the piston rod extends downwardly, a first stop member carried by to the piston rod adjacent the end. A second stop member carries by the piston rod and spaced from the first stop member; and a bracket assembly defining means for securing the bracket assembly to the vehicle suspension system and means for slidably receiving the portion of the piston rod disposed between the stop members. The shock absorber is secured to the frame of the vehicle and the bracket to the vehicle suspension system with the piston rod slideably through assembly between the stop members. Sufficient upward movement of the vehicle suspension system responds to the vehicle impacting an irregularity in the roadway causing the bracket assembly to abut the second stop member and urge the piston rod into the shock absorber providing additional shock absorbtion for the vehicle.

  19. Uterine Compression Sutures as an Effective Treatment for Postpartum Hemorrhage: Case Series

    PubMed Central

    Al Riyami, Nihal; Hui, Dini; Herer, Elaine; Nevo, Ori

    2011-01-01

    We evaluated the role of uterine compression sutures as a conservative treatment for postpartum hemorrhage (PPH) after failed medical treatment. We retrospectively reviewed the charts of all patients who delivered between 2003 and 2009 at a single tertiary care center and who underwent uterine compression sutures for PPH. Twelve women had uterine compression sutures for PPH. The mean age of the patients was 36.3 ± 5.2 years. The mean gestational age at delivery was 37.7 ± 2.0 weeks, and the average estimated blood loss was 2.1 ± 1.1 L. The mean procedure time to perform the uterine compression sutures was 9.3 ± 2.8 minutes. The success rate of compression sutures was 92% with only one failure resulting in a hysterectomy. Uterine compression sutures are an effective method for the treatment of PPH, thus avoiding hysterectomy and preserving potential fertility. PMID:23705085

  20. Iron-induced rat coronal suture fusion in vitro: the role of redox regulation.

    PubMed

    Im, M J; Winograd, J M; Manson, P N; Vander Kolk, C A

    1997-07-01

    The presumptive coronal sutures of rat fetuses at gestation days 19 and 20 have been shown to fuse prematurely when grown in the absence of dura mater in culture. In the present study, the representative enzymes of glucose metabolism and the antioxidative pathway were assayed during the process of suture fusion. The coronal sutures of fetal day 19.5 (F19) and neonatal day 1 rats were grown in the presence or absence of dura mater in serum-free culture. The enzymes assayed were hexokinase (HK) and pyruvate kinase (PK) of glycolysis, and glucose 6-phosphate dehydrogenase (G6PD) and glutathione reductase (GR) of the antioxidative pathway. F19 sutures cultured without dura mater, which fused, showed significant increases in enzyme activities over the preculture levels. HK increased by 200% to 300% of the preculture levels, G6PD by 400% to 500%, GR by 200%, and PK by 400% to 500%. The fetal sutures cultured with dura mater, which did not fuse, showed little alterations of HK, G6PD, and GR activities, but showed a significant 200% to 400% increase in PK activity. Neonatal sutures showed significant increases in enzyme activities during culture, but the presence of dura mater did not significantly affect enzyme activities. High activity levels of enzymes of the antioxidative pathway in F19 sutures coincided with the period of premature suture fusion. Treatment of fetal calvaria with prooxidant (induced by ferrous iron and ascorbic acid) produced suture fusion even in the presence of dura mater. Treatment with deferoxamine (an iron chelator and antioxidant) during the culture prevented suture fusion. The results suggest that fusing sutures experience increased biosynthetic demands and are placed under oxidative stress. When oxidative stress overwhelms the dural influence, the sutures undergo premature fusion. PMID:9482049

  1. Loop security and tensile properties of polyblend and traditional suture materials.

    PubMed

    Türker, Mehmet; K?l?ço?lu, Onder; Salduz, Ahmet; Bozda?, Ergun; Sünbülo?lu, Emin

    2011-02-01

    Tensile and knot properties of new generation (polyblend) and traditional suture materials in orthopedic surgery were investigated in standard laboratory conditions. Study focused on Fiberwire No. 5 and 2, Ethibond No. 5, 2 and 00, Orthocord No. 2, MaxBraid No. 2, Prolene No. 0 and 00, PDS No. 0 and 00, and Vicryl No. 2, 0 and 00. A 27-cm suture loop was fastened with 10 knots for ten samples for each type. Test parameters were tensile load to failure, elongation at failure point and knot slippage, and volume of 10-fold knots. Results were compared using ANOVA test. Failure load of No. 5 Fiberwire (625.0 ± 30.0 N) was significantly higher compared to all other suture types. Tensile strengths of MaxBraid No. 2 (287 ± 11 N) was significantly stronger compared to two other No. 2 polyblend sutures types and Ethibond No. 5. Knot slippage of Fiberwire No. 5 (14 ± 1.9 mm) was significantly higher compared to all other suture types. Ethibond No. 2 (0.1 ± 0.3 mm) had the lowest knot slippage. Elongation at the failure point of Fiberwire No. 2 (5%) was significantly lower than all other suture types. Mean calculated knot volume of #5 Fiberwire (73 ± 6.9 mm(3)) was significantly higher compared to #5 Ethibond (53 ± 4.8 mm(3)). Results of the study proved presence of significant differences between tensile and knot properties of various suture types and sizes. Loop security of larger diameter sutures is not always higher than thinner sutures. Suture elongation and knot slippage are important failure modes for high-diameter sutures and short-suture loops. PMID:20535447

  2. Patterns and implications of extensive heterochrony in carnivoran cranial suture closure

    PubMed Central

    Goswami, A; Foley, L; Weisbecker, V

    2013-01-01

    Heterochronic changes in the rate or timing of development underpin many evolutionary transformations. In particular, the onset and rate of bone development have been the focus of many studies across large clades. In contrast, the termination of bone growth, as estimated by suture closure, has been studied far less frequently, although a few recent studies have shown this to represent a variable, although poorly understood, aspect of developmental evolution. Here, we examine suture closure patterns across 25 species of carnivoran mammals, ranging from social-insectivores to hypercarnivores, to assess variation in suture closure across taxa, identify heterochronic shifts in a phylogenetic framework and elucidate the relationship between suture closure timing and ecology. Our results show that heterochronic shifts in suture closure are widespread across Carnivora, with several shifts identified for most major clades. Carnivorans differ from patterns identified for other mammalian clades in showing high variability of palatal suture closure, no correlation between size and level of suture closure, and little phylogenetic signal outside of musteloids. Results further suggest a strong influence of feeding ecology on suture closure pattern. Most of the species with high numbers of heterochronic shifts, such as the walrus and the aardwolf, feed on invertebrates, and these taxa also showed high frequency of closure of the mandibular symphysis, a state that is relatively rare among mammals. Overall, caniforms displayed more heterochronic shifts than feliforms, suggesting that evolutionary changes in suture closure may reflect the lower diversity of cranial morphology in feliforms. PMID:23530892

  3. Shock absorber servicing tool

    NASA Technical Reports Server (NTRS)

    Koepler, Jack L. (Inventor); Hill, Robert L. (Inventor)

    1981-01-01

    A tool to assist in the servicing of a shock absorber wherein the shock absorber is constructed of a pair of aligned gas and liquid filled chambers. Each of the chambers is separated by a movable separator member. Maximum efficiency of the shock absorber is achieved in the locating of a precise volume of gas within the gas chamber and a precise volume of liquid within the liquid chamber. The servicing tool of this invention employs a rod which is to connect with the separator and by observation of the position of the rod with respect to the gauge body, the location of the separator is ascertained even though it is not directly observable.

  4. Multiple-layer Radiation Absorber

    NASA Astrophysics Data System (ADS)

    Baker, Robert M. L.; Baker, Bonnie Sue

    A structure is discussed for absorbing incident radiation, either electromagnetic (EM) or sound. Such a surface structure is needed, for example, in a highly sensitive high-frequency gravitational wave or HFGW detector such as the Li-Baker. The multi-layer absorber, which is discussed, is constructed with metamaterial [MM] layer or layers on top. This MM is configured for a specific EM or sound radiation frequency band, which absorbs incident EM or sound radiation without reflection. Below these top MM layers is a substrate of conventional EM-radiation absorbing or acoustical absorbing reflective material, such as an array of pyramidal foam absorbers. Incident radiation is partially absorbed by the MM layer or layers, and then it is more absorbed by the lower absorbing and reflecting substrate. The remaining reflected radiation is even further absorbed by the MM layers on its "way out_ so that essentially all of the incident radiation is absorbed _ a nearly perfect black-body absorber. In a HFGW detector a substrate, such as foam absorbers, may outgas into a high vacuum and reduce the capability of the vacuum-producing equipment, however, the layers above this lowest substrate will seal the absorbing and reflecting substrate from any external vacuum. The layers also serve to seal the absorbing material against air or water flow past the surfaces of aircraft, watercraft or submarines. Other applications for such a multiple-level radiation absorber include stealth aircraft, missiles and submarines.

  5. New insights into the relationship between suture closure and craniofacial dysmorphology in sagittal nonsyndromic craniosynostosis

    PubMed Central

    Heuzé, Yann; Boyadjiev, Simeon A; Marsh, Jeffrey L; Kane, Alex A; Cherkez, Elijah; Boggan, James E; Richtsmeier, Joan T

    2010-01-01

    Premature closure of the sagittal suture occurs as an isolated (nonsyndromic) birth defect or as a syndromic anomaly in combination with other congenital dysmorphologies. The genetic causes of sagittal nonsyndromic craniosynostosis (NSC) remain unknown. Although variation of the dysmorphic (scaphocephaly) skull shape of sagittal NSC cases has been acknowledged, this variation has not been quantitatively studied three-dimensionally (3D). We have analyzed the computed tomography skull images of 43 infants (aged 0.9–9 months) with sagittal NSC using anatomical landmarks and semilandmarks to quantify and characterize the within-sample phenotypic variation. Suture closure patterns were defined by dividing the sagittal suture into three sections (anterior, central, posterior) and coding each section as ‘closed’ or ‘fused’. Principal components analysis of the Procrustes shape coordinates representing the skull shape of 43 cases of NSC did not separate individuals by sex, chronological age, or dental stages of the deciduous maxillary first molar. However, analysis of suture closure pattern allowed separation of these data. The central section of the sagittal suture appears to be the first to fuse. Then, at least two different developmental paths towards complete fusion of the sagittal suture exist; either the anterior section or the posterior section is the second to fuse. Results indicate that according to the sequence of sagittal suture closure patterns, different craniofacial complex shapes are observed. The relationship between craniofacial shape and suture closure indicates not only which suture fused prematurely (in our case the sagittal suture), but also the pattern of the suture closure. Whether these patterns indicate differences in etiology cannot be determined with our data and requires analysis of longitudinal data, most appropriately of animal models where prenatal conditions can be monitored. PMID:20572900

  6. In vitro mechanical evaluation of equine laryngeal tie-forward constructs prepared with different suture materials and placement patterns.

    PubMed

    Santos, Marcos P; Gutierrez-Nibeyro, Santiago D; Horn, Gavin P; Hicke, Joshua D; Stewart, Matthew C; Schaeffer, David J

    2015-04-01

    OBJECTIVE To compare the mechanical properties of laryngeal tie-forward (LTF) constructs prepared with different suture materials and suture placement patterns during single load to failure testing. SAMPLE Larynges harvested from 50 horse cadavers and 5 intact horse cadavers. PROCEDURES In vitro LTF constructs were created by a standard technique with polyester sutures, a standard technique with polyethylene sutures, a modified technique with metallic implants and polyester sutures, a modified technique with metallic implants and polyethylene sutures, or a modified tie-off technique with polyester sutures (10 of each type of construct). Mechanical properties including maximal load (N) at failure and failure mode were compared among constructs. Also, maximal loads at failure of the in vitro LTF constructs were compared with the loads exerted on the sutures tightened to achieve rostral laryngeal advancement in intact cadavers. RESULTS Constructs prepared by a standard technique with polyethylene sutures had a significantly higher pull out strength than those prepared by a modified technique with metallic implants and either polyester or polyethylene sutures. For constructs prepared by a standard technique with polyethylene sutures or similarly placed polyester sutures, maximal load at failure did not differ but the failure mode did differ significantly. The load to failure for all in vitro constructs was higher than the maximal load measured during a range of motion test in intact horse cadavers. CONCLUSIONS AND CLINICAL RELEVANCE Results suggested that LTF procedures can be performed in live horses with any of the suture materials and techniques tested. PMID:25815579

  7. Suture Bridge Fixation of a Femoral Condyle Traumatic Osteochondral Defect

    PubMed Central

    Bowers, Andrea L.

    2008-01-01

    Internal fixation of a traumatic osteochondral defect presents a challenge in terms of obtaining anatomic reduction, fixation, and adequate compression for healing. Fixation with countersunk intraarticular screws, Herbert screws, bioabsorbable screws and pins, mini-cancellous screws, and glue tissue adhesive have been reported with varying results. We present an alternative fixation method used in two patients for femoral condylar defects that achieved anatomic reduction with compression via a cruciate-shaped suture bridge construct tied down over a bony bridge. This fixation method allowed early passive range of motion and permitted high-quality MRI for followup of fracture healing and articular cartilage integrity. Arthroscopic examination of one of two patients at 6 months followup showed the gross appearance of a healed, anatomically reduced fracture. With 1 year followup for one patient and 2 years for the other, the patients have resumed activity as tolerated with full, painless range of motion at the knee. Longer-term outcomes are unknown. However, the suture bridge is an alternative means of fixation with encouraging early results for treatment of traumatic osteochondral fragments in the knee. Level of Evidence: Level IV, therapeutic study. See the Guidelines for Authors for a complete description of levels of evidence. PMID:18584263

  8. Solar concentrator/absorber

    NASA Technical Reports Server (NTRS)

    Von Tiesenhausen, G. F.

    1976-01-01

    Collector/energy converter, consisting of dual-slope optical concentrator and counterflow thermal energy absorber, is attached to multiaxis support structure. Efficient over wide range of illumination levels, device may be used to generate high temperature steam, serve as solar powered dryer, or power absorption cycle cooler.

  9. Neutron Absorbing Alloys

    DOEpatents

    Mizia, Ronald E. (Idaho Falls, ID); Shaber, Eric L. (Idaho Falls, ID); DuPont, John N. (Whitehall, PA); Robino, Charles V. (Albuquerque, NM); Williams, David B. (Bethlehem, PA)

    2004-05-04

    The present invention is drawn to new classes of advanced neutron absorbing structural materials for use in spent nuclear fuel applications requiring structural strength, weldability, and long term corrosion resistance. Particularly, an austenitic stainless steel alloy containing gadolinium and less than 5% of a ferrite content is disclosed. Additionally, a nickel-based alloy containing gadolinium and greater than 50% nickel is also disclosed.

  10. Absorber for dehydrating gas

    Microsoft Academic Search

    J. D. Honerkamp; H. O. Ebeling

    1984-01-01

    An improved absorber is claimed for extracting water or other liquid contaminants contained in gas including an upright vessel having a gas and a desiccant inlet; a gas outlet adjacent the top and a liquid desiccant outlet adjacent the bottom; a horizontal plate separating the interior of the vessel into an upper and lower chamber; a vertical mixing conduit within

  11. The deadman theory of suture anchors: observations along a South Texas fence line

    Microsoft Academic Search

    Stephen S. Burkhart

    1995-01-01

    Suture anchors are bing increasingly reported as a means of fixation of torn rotator cuff tendons to bone. The author has developed a mechanical model for the suture anchor-rotator cuff construct based on an analogy to the deadman system used to stabilize a corner fence post. Using this model, one can demonstrate a mechanically favorable angle of insertion of the

  12. A mathematical model for mechanotransduction at the early steps of suture formation

    PubMed Central

    Khonsari, R. H.; Olivier, J.; Vigneaux, P.; Sanchez, S.; Tafforeau, P.; Ahlberg, P. E.; Di Rocco, F.; Bresch, D.; Corre, P.; Ohazama, A.; Sharpe, P. T.; Calvez, V.

    2013-01-01

    Growth and patterning of craniofacial sutures is subjected to the effects of mechanical stress. Mechanotransduction processes occurring at the margins of the sutures are not precisely understood. Here, we propose a simple theoretical model based on the orientation of collagen fibres within the suture in response to local stress. We demonstrate that fibre alignment generates an instability leading to the emergence of interdigitations. We confirm the appearance of this instability both analytically and numerically. To support our model, we use histology and synchrotron X-ray microtomography and reveal the fine structure of fibres within the sutural mesenchyme and their insertion into the bone. Furthermore, using a mouse model with impaired mechanotransduction, we show that the architecture of sutures is disturbed when forces are not interpreted properly. Finally, by studying the structure of sutures in the mouse, the rat, an actinopterygian (Polypterus bichir) and a placoderm (Compagopiscis croucheri), we show that bone deposition patterns during dermal bone growth are conserved within jawed vertebrates. In total, these results support the role of mechanical constraints in the growth and patterning of craniofacial sutures, a process that was probably effective at the emergence of gnathostomes, and provide new directions for the understanding of normal and pathological suture fusion. PMID:23516237

  13. Responses of intramembranous bone and sutures upon in vivo cyclic tensile and compressive loading

    Microsoft Academic Search

    Alexandra I. Peptan; Aurora Lopez; Ross A. Kopher; Jeremy J. Mao

    2008-01-01

    Cranial vault and facial sutures interpose between mineralized bones of the skull, and may function analogously to appendicular and cranial base growth plates. However, unlike growth plates that are composed of chondrocyte lineage, cranial and facial sutures possess heterogeneous cell lineages such as mesenchymal cells, fibroblasts, and osteoblasts, in addition to vascular-derived cells. Despite recently intensified effort, the biological responses

  14. Mechanical Properties of Cranial Bones and Sutures in 1–2-Year-Old Infants

    PubMed Central

    Wang, Jiawen; Zou, Donghua; Li, Zhengdong; Huang, Ping; Li, Dongri; Shao, Yu; Wang, Huijun; Chen, Yijiu

    2014-01-01

    Background The mechanical properties of 1–2-year-old pediatric cranial bones and sutures and their influential factors were studied to better understand how the pediatric calvarium reacts to loading. Material/Methods Cranial bone and suture specimens were extracted from seven fresh-frozen human infant cadavers (1.5±0.5 years old). Eight specimens were obtained from each subject: two frontal bones, two parietal bones, two sagittal suture samples, and two coronal suture samples. The specimens were tested in a three-point bend setup at 1.5 mm/s. The mechanical properties, such as ultimate stress, elastic modulus, and ultimate strain, were calculated for each specimen. Results The ultimate stress and elastic modulus of the frontal bone were higher than those of the parietal bone (P<0.05). No differences were found between the coronal and sagittal sutures in ultimate stress, elastic modulus, or ultimate strain (P>0.05). The ultimate stress and elastic modulus of the frontal and parietal bones were higher than those of the sagittal and coronal sutures (P<0.05), whereas the opposite ultimate strain findings were revealed (P<0.05). Conclusions There was no significant difference in ultimate stress, elastic modulus, or ultimate strain between the sagittal and coronal sutures. However, there were significant differences in ultimate stress, elastic modulus, and ultimate strain between the frontal and parietal bones as well as between the cranial bones and sutures. PMID:25279966

  15. An innovative method to evaluate the suture compliance in sealing the surgical wound lips

    PubMed Central

    Saleh, Farid; Palmieri, Beniamino; Lodi, Danielle; Al-Sebeih, Khalid

    2008-01-01

    Background and aim: The increasing number of surgical procedures performed with local anesthesia, followed by immediate patient discharge from the hospital, emphasizes the need for a tight waterproof suture that is capable of maintaining its tensile strength in the postoperative phase when the wound tumescence, edema due to the anesthetic drug, and surgical trauma disappear. Moreover, the issue of having an accurate surgical wound closure is very relevant in vivo in order to prevent hemorrhage and exogenous microbial infections. This study aimed at designing a new a lab technique that could be used for evaluating the best surgical material. Using such a technique, we compared the wound-lip-sealing properties of three commonly-used suture threads, namely polyurethane, polypropylene, and polyamide. Materials and methods: The mechanical properties of same-size suture threads made from polyurethane, polypropylene, and polyamide, were compared in order to define the one that possess the best elastic properties by being able to counteract the tension-relaxation process in the first 12 hours following surgery. The tension holding capacity of the suture materials was measured in both in vivo and in vitro experiments. The surface area of the scar associated with the three different suture threads was measured and compared, and the permeability of the three different suture threads was assessed at 0 minute, 2 minute, 4 minute, 6 minute, and 8 minute- interval. Results: Results showed that polyurethane suture threads had significantly (P < 0.05) better tensile strength, elongation endurance before breakage, and better elasticity coefficient as compared to polypropylene and polyamide suture threads. Moreover, polyurethane suture threads were significantly (P < 0.05) more impermeable as compared to the other two suture thread types (polypropylene and polyamide). This impermeability was also associated with a tighter wound-lip-sealing ability, and with significantly (P < 0.05) less scar formation. Conclusion: Among the main concerns that surgeons, physicians, and patients often have is the development infection, oozing, and scar at the incision site following suturing. This always raises the question about which suture to use to avoid the above problems. This study provides evidence that the new technique developed in our lab could be used to compare the wound-lip sealing properties of different surgical suture threads. Using such a technique, the results show that polyurethane is significantly better than other commonly-used suture threads, like polypropylene and polyamide, in relation to wound sealing and scar formation. PMID:19015745

  16. Glenoid damage from articular protrusion of metal suture anchor after arthroscopic rotator cuff repair.

    PubMed

    Kim, Yang-Soo; Ok, Ji-Hoon; Garzon-Muvdi, Juan; McFarland, Edward G

    2015-03-01

    Arthroscopic repair of rotator cuff tears has been shown to be effective and safe. The use of suture anchors has increased the ability to perform rotator cuff repairs arthroscopically. However, the use of suture anchors for any surgery around the shoulder can result in complications if the devices are not used and inserted properly. Complications that have been reported with the use of suture anchors for rotator cuff surgery include prominent anchors in the tuberosities, dislodged anchors secondary to pull-out or improper insertion, and osteolysis around the anchors. We report a case of articular cartilage damage secondary to a suture anchor protruding through the humeral head because of improper anchor insertion. Our patient's case reminds surgeons not only to be careful of the depth of insertion of suture anchors when performing rotator cuff surgery but also to obtain radiographs to evaluate the anchor position if patients continue to have symptoms after rotator cuff repair using these devices. PMID:25750956

  17. Why do we fail in aging the skull from the sagittal suture?

    PubMed

    Hershkovitz, I; Latimer, B; Dutour, O; Jellema, L M; Wish-Baratz, S; Rothschild, C; Rothschild, B M

    1997-07-01

    The controversy over the reliability of ectocranial suture status (open vs. closed) as an age estimation stimulated the pursuit of Meindl and Lovejoy's suggestion (Meindl and Lovejoy [1985] Am. J. Phys. Anthropol. 68:57-66) for large scale analysis. The extent of the sagittal suture closure was assessed in 3,636 skulls from the Hamann-Todd and Terry collections. The debate over whether cranial suture ossification represents a pathologic or an age-predictable pathologic process also stimulated a comparison with age and two stress markers, hyperostosis frontalis interna and tuberculosis. Sagittal suture closure was found to be age-independent and sexually biased. The wide confidence intervals (for age) appear to preclude meaningful application of suture status for age determination. No correlation was found with the tested biological stressors. PMID:9261501

  18. Effects of myrrh on the strength of suture materials: an in vitro study.

    PubMed

    Alshehri, Mohammed A; Baskaradoss, Jagan Kumar; Geevarghese, Amrita; Ramakrishnaiah, Ravikumar; Tatakis, Dimitris N

    2015-04-01

    The present in vitro study sought to determine the effects of myrrh-containing solutions on common suture materials used in periodontal surgery. Three commonly used suture materials (silk, polyglactin 910, polytetrafluoroethylene) were immersed in four thermostatically controlled experimental media to simulate daily oral rinsing activity, namely -artificial saliva, normal saline solution with 0.2% Commiphora myrrh, full-concentration (100%) Commiphora myrrh oil, and a myrrh-containing commercial mouthwash. Tensile strength was measured at the end of each day using an Instron tensile testing machine. Silk sutures were susceptible to tensile strength loss when exposed to 0.2% myrrh solution once daily for 5 days. Myrrh-containing commercial mouthwash had no effect on tensile strength, but all three suture materials lost tensile strength when exposed to 100% myrrh oil. For patients that routinely use myrrh mouthwashes postoperatively, findings of this study suggested that silk sutures might not be the optimal material choice. PMID:25736257

  19. Skin closure after arthroscopy utilizing a pull-out bow-tie subcuticular suture

    PubMed Central

    Nacius, Lori Ann; Pascual-Garrido, Cecilia; Sagiv, Paul; Mei-Dan, Omer

    2014-01-01

    Summary Background: suturing techniques employed to close subcuticular surgical incisions are varied. Purpose: we present the “bow-tie” stitch, which is removed by pulling one side of the stitch with no need for sharp object stitch cutting. The stitch results in good approximation and scarring while enabling proper oozing. Methods: we have used this suture repeatedly for wound closure after hip and knee arthroscopy; its application to other superficial skin closures is easily appreciated. Results: this method of skin closure allows for ease of tying for the surgeon, aesthetically pleasing results for the patient, pain-free suture removal, no risk of suture knots becoming embedded in healing tissue, and decreased risk of infection and damage to skin, as instruments are not required for suture removal. PMID:25767775

  20. The BMP Ligand Gdf6 Prevents Differentiation of Coronal Suture Mesenchyme in Early Cranial Development

    PubMed Central

    Clendenning, Dawn E.; Mortlock, Douglas P.

    2012-01-01

    Growth Differentiation Factor-6 (Gdf6) is a member of the Bone Morphogenetic Protein (BMP) family of secreted signaling molecules. Previous studies have shown that Gdf6 plays a role in formation of a diverse subset of skeletal joints. In mice, loss of Gdf6 results in fusion of the coronal suture, the intramembranous joint that separates the frontal and parietal bones. Although the role of GDFs in the development of cartilaginous limb joints has been studied, limb joints are developmentally quite distinct from cranial sutures and how Gdf6 controls suture formation has remained unclear. In this study we show that coronal suture fusion in the Gdf6?/? mouse is due to accelerated differentiation of suture mesenchyme, prior to the onset of calvarial ossification. Gdf6 is expressed in the mouse frontal bone primordia from embryonic day (E) 10.5 through 12.5. In the Gdf6?/? embryo, the coronal suture fuses prematurely and concurrently with the initiation of osteogenesis in the cranial bones. Alkaline phosphatase (ALP) activity and Runx2 expression assays both showed that the suture width is reduced in Gdf6+/? embryos and is completely absent in Gdf6?/? embryos by E12.5. ALP activity is also increased in the suture mesenchyme of Gdf6+/? embryos compared to wild-type. This suggests Gdf6 delays differentiation of the mesenchyme occupying the suture, prior to the onset of ossification. Therefore, although BMPs are known to promote bone formation, Gdf6 plays an inhibitory role to prevent the osteogenic differentiation of the coronal suture mesenchyme. PMID:22693558

  1. Celastrol nanoparticles inhibit corneal neovascularization induced by suturing in rats

    PubMed Central

    Li, Zhanrong; Yao, Lin; Li, Jingguo; Zhang, Wenxin; Wu, Xianghua; Liu, Yi; Lin, Miaoli; Su, Wenru; Li, Yongping; Liang, Dan

    2012-01-01

    Purpose Celastrol, a traditional Chinese medicine, is widely used in anti-inflammation and anti-angiogenesis research. However, the poor water solubility of celastrol restricts its further application. This paper aims to study the effect of celastrol nanoparticles (CNPs) on corneal neovascularization (CNV) and determine the possible mechanism. Methods To improve the hydrophilicity of celastrol, celastrol-loaded poly(ethylene glycol)-block-poly(?-caprolactone) nanopolymeric micelles were developed. The characterization of CNPs was measured by dynamic light scattering and transmission electron microscopy analysis. Celastrol loading content and release were assessed by ultraviolet-visible analysis and high performance liquid chromatography, respectively. In vitro, human umbilical vein endothelial cell proliferation and capillary-like tube formation were assayed. In vivo, suture-induced CNV was chosen to evaluate the effect of CNPs on CNV in rats. Immunohistochemistry for CD68 assessed the macrophage infiltration of the cornea on day 6 after surgery. Real-time quantitative reverse transcription-polymerase chain reaction and enzyme-linked immunosorbent assay were used to evaluate the messenger ribonucleic acid and protein levels, respectively, of vascular endothelial growth factor, matrix metalloproteinase 9, and monocyte chemoattractant protein 1 in the cornea. Results The mean diameter of CNPs with spherical shape was 48 nm. The celastrol loading content was 7.36%. The release behavior of CNPs in buffered solution (pH 7.4) showed a typical two-phase release profile. CNPs inhibited the proliferation of human umbilical vein endothelial cells in a dose-independent manner and suppressed the capillary structure formation. After treatment with CNPs, the length and area of CNV reduced from 1.16 ± 0.18 mm to 0.49 ± 0.12 mm and from 7.71 ± 0.94 mm2 to 2.29 ± 0.61 mm2, respectively. Macrophage infiltration decreased significantly in the CNP-treated corneas. CNPs reduced the expression of vascular endothelial growth factor, matrix metalloproteinase 9, and monocyte chemoattractant protein 1 in the cornea on day 6 after suturing. Conclusion CNPs significantly inhibited suture-induced CNV by suppressing macrophage infiltration and the expression of vascular endothelial growth factor and matrix metalloproteinase 9 in the rat cornea. PMID:22419865

  2. Apollo couch energy absorbers

    NASA Technical Reports Server (NTRS)

    Wesselski, C. J.; Drexel, R. E.

    1972-01-01

    Load attenuators for the Apollo spacecraft crew couch and its potential applications are described. Energy absorption is achieved through friction and cyclic deformation of material. In one concept, energy absorption is accomplished by rolling a compressed ring of metal between two surfaces. In another concept, energy is absorbed by forcing a plastically deformed washer along a rod. Among the design problems that had to be solved were material selection, fatigue life, ring slippage, lubrication, and friction loading.

  3. Non-touch suturing technique fails to reduce glove puncture rates in an accident and emergency department

    Microsoft Academic Search

    T K McAdam; R E McLaughlin; B McNicholl

    2004-01-01

    Objective: To assess the impact of introducing a safer non-touch suturing technique into an inner city emergency department.Methods: The rate of glove perforation, measured by electrical conductance, was used as a marker. Gloves (Bodyguards) used in suturing were collected over a two month period. Two half day suture workshops were then conducted in the emergency department and gloves were collected

  4. Minimally invasive surgery task decomposition--etymology of endoscopic suturing.

    PubMed

    Rosen, Jacob; Chang, Lily; Brown, Jeffrey D; Hannaford, Blake; Sinanan, Mika; Satava, Richard

    2003-01-01

    The analogy between Minimally Invasive Surgery (MIS) and the human language inspires the decomposition of a surgical task into its primary elements. The frequency of different elements or words" and their sequential associations or "grammar" both hold critical information about the process and outcome of the procedure. Modeling these sequential element expressions using a multi finite states model (Markov model) reveals the grammatical structure of the surgical task and is utilized as one of the key steps in objectively assessing surgical performance. The experimental protocol included 30 surgeons at different levels of training (5xR1,R2,R3,R4,R5, and experts) performing Laparoscopic suturing on an animal model (pig). The kinematics and dynamics of left and right endoscopic tools along with the visual view of the surgical scene were acquired by the Blue DRAGON system. The methodology of decomposing the surgical task is based on a fully connected, finite-states (30 states) Markov model (MM) where the left and right hands are represented by 15 states each. In addition to the MM objective analysis, a scoring protocol was used by an expert surgeon to subjectively assess the subjects' technical performance. An objective learning curve was defined based on measuring quantitative statistical distance (similarity) between MM of experts and MM of residents at different levels of training. The objective learning curve (e.g. statistical distance between MM) was similar to that of the subjective performance analysis. The MM proved to be a powerful and compact mathematical model for decomposing a complex task such as laparoscopic suturing. Systems like surgical robots or virtual reality simulators that inherently measure the kinematics and dynamics of the surgical tool may benefit from inclusion of the proposed methodology for analysis of efficacy and objective evaluation of surgical skills during training. PMID:15455911

  5. Corrosion resistant neutron absorbing coatings

    DOEpatents

    Choi, Jor-Shan; Farmer, Joseph C; Lee, Chuck K; Walker, Jeffrey; Russell, Paige; Kirkwood, Jon; Yang, Nancy; Champagne, Victor

    2013-11-12

    A method of forming a corrosion resistant neutron absorbing coating comprising the steps of spray or deposition or sputtering or welding processing to form a composite material made of a spray or deposition or sputtering or welding material, and a neutron absorbing material. Also a corrosion resistant neutron absorbing coating comprising a composite material made of a spray or deposition or sputtering or welding material, and a neutron absorbing material.

  6. Corrosion resistant neutron absorbing coatings

    DOEpatents

    Choi, Jor-Shan (El Cerrito, CA); Farmer, Joseph C. (Tracy, CA); Lee, Chuck K. (Hayward, CA); Walker, Jeffrey (Gaithersburg, MD); Russell, Paige (Las Vegas, NV); Kirkwood, Jon (Saint Leonard, MD); Yang, Nancy (Lafayette, CA); Champagne, Victor (Oxford, PA)

    2012-05-29

    A method of forming a corrosion resistant neutron absorbing coating comprising the steps of spray or deposition or sputtering or welding processing to form a composite material made of a spray or deposition or sputtering or welding material, and a neutron absorbing material. Also a corrosion resistant neutron absorbing coating comprising a composite material made of a spray or deposition or sputtering or welding material, and a neutron absorbing material.

  7. Electron beam standby absorber system

    NASA Technical Reports Server (NTRS)

    Downing, R. D.

    1968-01-01

    Electron beam energy is absorbed by deflectors which allow beam distribution over an absorber located between the deflectors and workpiece. The undeflected beam passes through a hole in the absorber when the deflection is de-energized, when energized, the beam is kept to a minimum power level by deflection rate change.

  8. Low temperature selective absorber research

    Microsoft Academic Search

    S. A. Herzenberg; R. Silberglitt

    1982-01-01

    Research carried out since 1979 on selective absorbers is surveyed, with particular attention given to the low-temperature coatings seen as promising for flat plate and evacuated tube applications. The most thoroughly investigated absorber is black chrome, which is highly selective and is the most durable low-temperature absorber. It is believed that other materials, because of their low cost and lower

  9. Underwater acoustic omnidirectional absorber

    NASA Astrophysics Data System (ADS)

    Naify, Christina J.; Martin, Theodore P.; Layman, Christopher N.; Nicholas, Michael; Thangawng, Abel L.; Calvo, David C.; Orris, Gregory J.

    2014-02-01

    Gradient index media, which are designed by varying local element properties in given geometry, have been utilized to manipulate acoustic waves for a variety of devices. This study presents a cylindrical, two-dimensional acoustic "black hole" design that functions as an omnidirectional absorber for underwater applications. The design features a metamaterial shell that focuses acoustic energy into the shell's core. Multiple scattering theory was used to design layers of rubber cylinders with varying filling fractions to produce a linearly graded sound speed profile through the structure. Measured pressure intensity agreed with predicted results over a range of frequencies within the homogenization limit.

  10. Absorbed dose water calorimeter.

    PubMed

    Domen, S R

    1980-01-01

    Advantage was taken of the low thermal diffusivity of water and the imperviousness of polyethylene film to water to construct a calorimeter for directly measuring absorbed dose in that medium. An ultrasmall bead thermistor was sandwiched between two thin films stretched on polystyrene rings and immersed in an unregulated water bath. Ten cobalt-60 irradiation runs were made with a precision of 0.5% mean error of the mean at a dose rate of 66 mGy/s. Further development is directed toward a standard instrument that can be used in a medical therapy beam. PMID:7382919

  11. Physical properties of surgical suture materials: Stress-strain relationship, stress-relaxation and irreversible elongation.

    PubMed Central

    Holmlund, D E

    1976-01-01

    The stress-strain relationship, the stress-relaxation and the irreversible elongation of different suture materials were investigated. It was found that the distensibility of the fibers varied greatly. Most fibers were found to be chiefly elastic but some fibers were elastic when a moderate load was applied and plastic when the load increased. Some fibers, especially Prolene, were plastic also when moderate load was applied. The importance of information concerning these and other physical properties of surgical suture material is pointed out. In the future, surgeons will not have to accept suture materials with unknown physical properties but will demand fibers with defined properties for every purpose. PMID:952566

  12. Sensing with THz metamaterial absorbers

    E-print Network

    Cong, Longqing

    2014-01-01

    Metamaterial perfect absorbers from microwaves to optical part of the electromagnetic spectrum has been intensely studied for its ability to absorb electromagnetic radiation. Perfect absorption of light by metamaterials have opened up new opportunities for application oriented functionalities such as efficient sensors and emitters. We present an absorber based sensing scheme at the terahertz frequencies and discuss optimized designs to achieve high frequency and amplitude sensitivities. The major advantage of a perfect metamaterial absorber as a sensor is the sensitive shift in the absorber resonance frequency along with the sharp change in the amplitude of the resonance due to strong interaction of the analyte with the electric and the magnetic fields at resonant perfect absorption frequency. We compare the sensing performance of the perfect metamaterial absorber with its complementary structural design and planar metasurface with identical structure. The best FoM values obtained for the absorber sensor here...

  13. Metamaterial saturable absorber mirror.

    PubMed

    Dayal, Govind; Ramakrishna, S Anantha

    2013-02-01

    We propose a metamaterial saturable absorber mirror at midinfrared wavelengths that can show a saturation of absorption with intensity of incident light and switch to a reflecting state. The design consists of an array of circular metallic disks separated by a thin film of vanadium dioxide (VO(2)) from a continuous metallic film. The heating due to the absorption in the absorptive state causes the VO(2) to transit to a metallic phase from the low temperature insulating phase. The metamaterial switches from an absorptive state (R?0.1%) to a reflective state (R>95%) for a specific threshold intensity of the incident radiation corresponding to the phase transition of VO(2), resulting in the saturation of absorption in the metamaterial. The computer simulations show over 99.9% peak absorbance, a resonant bandwidth of about 0.8 ?m at 10.22 ?m wavelengths, and saturation intensity of 140 mW cm(-2) for undoped VO(2) at room temperature. We also carried out numerical simulations to investigate the effects of localized heating and temperature distribution by solving the heat diffusion problem. PMID:23381408

  14. Shyok Suture Zone, N Pakistan: late Mesozoic Tertiary evolution of a critical suture separating the oceanic Ladakh Arc from the Asian continental margin

    NASA Astrophysics Data System (ADS)

    Robertson, Alastair H. F.; Collins, Alan S.

    2002-02-01

    The Shyok Suture Zone (Northern Suture) of North Pakistan is an important Cretaceous-Tertiary suture separating the Asian continent (Karakoram) from the Cretaceous Kohistan-Ladakh oceanic arc to the south. In previously published interpretations, the Shyok Suture Zone marks either the site of subduction of a wide Tethyan ocean, or represents an Early Cretaceous intra-continental marginal basin along the southern margin of Asia. To shed light on alternative hypotheses, a sedimentological, structural and igneous geochemical study was made of a well-exposed traverse in North Pakistan, in the Skardu area (Baltistan). To the south of the Shyok Suture Zone in this area is the Ladakh Arc and its Late Cretaceous, mainly volcanogenic, sedimentary cover (Burje-La Formation). The Shyok Suture Zone extends northwards (ca. 30 km) to the late Tertiary Main Karakoram Thrust that transported Asian, mainly high-grade metamorphic rocks southwards over the suture zone. The Shyok Suture Zone is dominated by four contrasting units separated by thrusts, as follows: (1). The lowermost, Askore amphibolite, is mainly amphibolite facies meta-basites and turbiditic meta-sediments interpreted as early marginal basin rift products, or trapped Tethyan oceanic crust, metamorphosed during later arc rifting. (2). The overlying Pakora Formation is a very thick (ca. 7 km in outcrop) succession of greenschist facies volcaniclastic sandstones, redeposited limestones and subordinate basaltic-andesitic extrusives and flow breccias of at least partly Early Cretaceous age. The Pakora Formation lacks terrigenous continental detritus and is interpreted as a proximal base-of-slope apron related to rifting of the oceanic Ladakh Arc; (3). The Tectonic Melange (<300 m thick) includes serpentinised ultramafic rocks, near mid-ocean ridge-type volcanics and recrystallised radiolarian cherts, interpreted as accreted oceanic crust. (4). The Bauma-Harel Group (structurally highest) is a thick succession (several km) of Ordovician and Carboniferous to Permian-Triassic, low-grade, mixed carbonate/siliciclastic sedimentary rocks that accumulated on the south-Asian continental margin. A structurally associated turbiditic slope/basinal succession records rifting of the Karakoram continent (part of Mega-Lhasa) from Gondwana. Red clastics of inferred fluvial origin ('molasse') unconformably overlie the Late Palaeozoic-Triassic succession and are also intersliced with other units in the suture zone. Reconnaissance further east (north of the Shyok River) indicates the presence of redeposited volcaniclastic sediments and thick acid tuffs, derived from nearby volcanic centres, presumed to lie within the Ladakh Arc. In addition, comparison with Lower Cretaceous clastic sediments (Maium Unit) within the Northern Suture Zone, west of the Nanga Parbat syntaxis (Hunza River) reveals notable differences, including the presence of terrigenous quartz-rich conglomerates, serpentinite debris-flow deposits and a contrasting structural history. The Shyok Suture Zone in the Skardu area is interpreted to preserve the remnants of a rifted oceanic back-arc basin and components of the Asian continental margin. In the west (Hunza River), a mixed volcanogenic and terrigenous succession (Maium Unit) is interpreted to record syn-deformational infilling of a remnant back-arc basin/foreland basin prior to suturing of the Kohistan Arc with Asia (75-90 Ma).

  15. Barbed sutures in total knee arthroplasty: are these safe, efficacious, and cost-effective?

    PubMed

    Maheshwari, Aditya V; Naziri, Qais; Wong, Andy; Burko, Ivan; Mont, Michael A; Rasquinha, Vijay J

    2015-04-01

    The use of barbed sutures has become increasingly popular; however, their efficacy and safety continues to be debated. We review the records of 333 primary total knee arthroplasties (TKAs) to determine the difference in wound closure and total operative time between patients closed with a barbed versus standard sutures. We also evaluated complication rates and cost differences between the two groups. Overall, we saw no significant difference in either wound closure time (31 vs. 30 minutes) or total operative time (115 vs. 114 minutes). No significant differences were observed in the complication rate. Material costs were lower overall in the barbed suture group ($66.78 vs. 82.59). Further studies will be required to determine the role of barbed sutures in TKA. PMID:24764228

  16. The Effect of Tissue Culture on Suture Holding Strength and Degradation in Canine Tendon

    PubMed Central

    Omae, H.; Zhao, C.; Sun, Y.-L.; Zobitz, M. E.; Moran, S. L.; Amadio, P. C.

    2013-01-01

    The purpose of this study was to assess tendon metabolism and suture pull-out strength after simple tendon suture in a tissue culture model. One hundred and twelve flexor digitorum profundus tendons from 28 dogs were cultured for 7, 14, or 21 days with or without a static tensile load. In both groups increased levels of matrix metalloproteinase (MMP) mRNA was noted. Suture pull-out strength did not decrease during tissue culture. While the presence of a static load had no effect on the pull-out strength, it did affect MMP mRNA expression. This tissue culture model could be useful in studying the effect of factors on the tendon-suture interface. PMID:19587082

  17. Arthroscopic Double-Locked Stitch: A New Technique for Suturing Rotator Cuff Tears

    PubMed Central

    Miyazaki, Alberto N.; Zanella, Luiz A.Z.; La Salvia, João C.; Fregoneze, Marcelo; Santos, Pedro D.; da Silva, Luciana A.; Sella, Guilherme do Vall; Checchia, Sergio L.

    2014-01-01

    There are a number of reasons for failed rotator cuff tear repair. In such cases the suture-tendon interface seems to be the most vulnerable area, especially when tendon degeneration is present. We describe a new technique, the arthroscopic double-locked suture, that increases the tendon fixation and has the added benefit of being placed parallel to the blood vessels, therefore avoiding damage to the tendon vascularization. The suture may be achieved by use of knots or knotless anchors and suture passers, without the need for any additional instrumentation. The new technique is especially helpful in cases in which the tendon is retracted and degeneration is present, impeding the use of the double-row technique or its transosseous equivalents. PMID:24904764

  18. Toward Modeling of a Suturing Task Matt LeDuc, Shahram Payandeh and John Dill

    E-print Network

    on a standard PC and models the action of a suturing device used in minimally invasive Laparoscopic surgery. 1 training environment, e.g. our Laparoscopic Training Environment (LTE), virtual representations need

  19. Absorber coatings' degradation

    SciTech Connect

    Moore, S.W.

    1984-01-01

    This report is intended to document some of the Los Alamos efforts that have been carried out under the Department of Energy (DOE) Active Heating and Cooling Materials Reliability, Maintainability, and Exposure Testing program. Funding for these activities is obtained directly from DOE although they represent a variety of projects and coordination with other agencies. Major limitations to the use of solar energy are the uncertain reliability and lifetimes of solar systems. This program is aimed at determining material operating limitations, durabilities, and failure modes such that materials improvements can be made and lifetimes can be extended. Although many active and passive materials and systems are being studied at Los Alamos, this paper will concentrate on absorber coatings and degradation of these coatings.

  20. Absorber for dehydrating gas

    SciTech Connect

    Honerkamp, J.D.; Ebeling, H.O.

    1984-06-19

    An improved absorber is claimed for extracting water or other liquid contaminants contained in gas including an upright vessel having a gas and a desiccant inlet; a gas outlet adjacent the top and a liquid desiccant outlet adjacent the bottom; a horizontal plate separating the interior of the vessel into an upper and lower chamber; a vertical mixing conduit within the vessel connected at its upper end with the vessel gas and desiccant inlets and passing downwardly through an opening in the plate, the vertical mixing conduit having a mixer element therein which intimately co-mingles the gas and liquid desiccant as they pass into the vessel and downwardly through the mixing conduit into the vessel lower chamber; a plurality of vertical cylindrical members supported in openings in the horizontal plate, the lower end extending below the plate and the upper end extending above the plate; a cap covering the upper portion of each of the cylindrical members, each cap having passageways in the lower edges thereof so that gas and liquid can flow upwardly through the vertical cylindrical members and under the caps and into the vessel upper chamber; packing within the vessel upper chamber, the lower chamber and the lower portion of the upper chamber having the packing therein being filled with liquid desiccant and means of maintaining the level of liquid desiccant and withdrawing the desiccant from the vessel so as to maintain the preselected level, the gas passing out the gas outlet in the upper portion of the vessel and the water in the gas being absorbed by the liquid desiccant and carried out of the vessel with the desiccant.

  1. Endoscopic removal of intravesical polypropylene suture with plasmakinetic resection after abdominal hysterectomy

    PubMed Central

    Küçükdurmaz, Faruk; Can, Selman; Barut, Osman

    2014-01-01

    INTRODUCTION Intravesical foreign substances such as mesh or suture are among the rare reasons of recurrent urinary tract infections. Anti-incontinence and prolapsus procedures are associated with mesh/suture extrusion into the bladder, however, this complication is uncommon with abdominal hysterectomy. PRESENTATION OF CASE A 61-year-old female, obese patient admitted to our clinic with recurrent urinary tract infections and voiding symptoms which were worsened after abdominal hysterectomy. Radiological evaluation revealed an intravesical foreign material within the bladder. The cytoscopy was performed and a polypropylene suture which was inserted from dome, passed through the base and exited from the dome of bladder during abdominal hysterectomy. Transurethral plasmakinetic resection of superficial layer of urothelium between suture entrance and exit sites was performed and suture was removed from the bladder. DISCUSSION Urogynecological procedures are associated with the increased risk of urethral or ureteral injury, intravesical mesh or suture erosion and fistulae formation. Many different techniques including open, laparoscopic and transvaginal approaches were described for the removal of intravesical mesh/suture extrusion in the literature. Transurethral approach with its minimally invasive and safe nature was used to remove suture in this patient. This technique with the use of plasmakinetic energy has the advantage of decreased risk of bleeding and urothelial injury when compared to monopolar cautery. It also avoids the need for open or extensive surgery which may have a high rate of complications. CONCLUSION Transurethral resection is the treatment of choice for the removal of intravesical foreign substances. Use of plasmakinetic energy will decrease the risk of complications and avoid the need for open interventions. PMID:25437667

  2. Pullout strength of meniscal repair after cyclic loading: comparison of vertical, horizontal, and oblique suture techniques

    Microsoft Academic Search

    Yavuz Kocabey; Omer Taser; John Nyland; Mahmut Nedim Doral; Mehmet Demirhan; David N. M. Caborn; Sezgin Sarban

    2006-01-01

    This in vitro biomechanical study with cyclic loading compared the pullout strength of vertical, horizontal, and oblique sutures used for meniscal lesion repair. Following repair of vertical longitudinal lesions created in bovine medial menisci, three groups of seven specimens (vertical, horizontal, and oblique sutures) underwent cyclic loading in a randomized test order (5 mm\\/min, cycling between 5 and 50 N at 1 Hz

  3. A single centre comparative study of laparoscopic mesh rectopexy versus suture rectopexy

    PubMed Central

    Sahoo, Manash Ranjan; Thimmegowda, Anil Kumar; Gowda, Manoj S

    2014-01-01

    AIM: The aim of our study is to compare the results of laparoscopic mesh vs. suture rectopexy. MATERIALS AND METHODS: In this retrospective study, 70 patients including both male and female of age ranging between 20 years and 65 years (mean 42.5 yrs) were subjected to laparoscopic rectopexy during the period between March 2007 and June 2012, of which 38 patients underwent laparoscopic mesh rectopexy and 32 patients laparoscopic suture rectopexy. These patients were followed up for a mean period of 12 months assessing first bowel movement, hospital stay, duration of surgery, faecal incontinence, constipation, recurrence and morbidity. RESULTS: Duration of surgery was 100.8 ± 12.4 minutes in laparoscopic suture rectopexy and 120 ± 10.8 min in laparoscopic mesh rectopexy. Postoperatively, the mean time for the first bowel movement was 38 hrs and 40 hrs, respectively, for suture and mesh rectopexy. Mean hospital stay was five (range: 4-7) days. There was no significant postoperative complication except for one port site infection in mesh rectopexy group. Patients who had varying degree of incontinence preoperatively showed improvement after surgery. Eleven out of 18 (61.1%) patients who underwent laparoscopic suture rectopexy as compared to nine of 19 (47.3%) patients who underwent laparoscopic mesh rectopexy improved as regards constipation after surgery. CONCLUSION: There were no significant difference in both groups who underwent surgery except for patients undergoing suture rectopexy had better symptomatic improvement of continence and constipation. Also, cost of mesh used in laparoscopic mesh rectopexy is absent in lap suture rectopexy group. To conclude that laparoscopic suture rectopexy is a safe and feasible procedure and have comparable results as regards operative time, morbidity, bowel function, cost and recurrence or even slightly better results than mesh rectopexy. PMID:24501504

  4. A BIOMECHANICAL ANALYSIS OF A NEW INTERLOCK SUTURE TECHNIQUE FOR FLEXOR TENDON REPAIR

    Microsoft Academic Search

    G. A. ROBERTSON; M. M. AL-QATTAN

    1992-01-01

    Using a computerised tensometer, both the gap-producing and breaking forces of a new interlocking suture for flexor tendon repair were compared to the modified Kessler and the Strickland techniques. 30 porcine deep flexor tendons were used in each group and all repairs were performed with 3\\/0 polypropylene sutures. The interlock technique withstood gap-producing and breaking forces significantly better than the

  5. Antibacterial protection of suture material by chlorhexidine-functionalized polyelectrolyte multilayer films

    Microsoft Academic Search

    Jean-Claude Harnet; Erell Le Guen; Vincent Ball; Henri Tenenbaum; Joelle Ogier; Youssef Haikel; Constant Vodouhê

    2009-01-01

    The formation of bacterial biofilms on the surface of implanted materials is a critical factor that may lead to chronic microbial\\u000a infection and tissue necrosis. In the present study we analysed the stability of polyelectrolyte multilayer (ML) films on\\u000a suture materials and the antibacterial effect obtained with chlorhexidine (CHX)-functionalized films built on different types\\u000a of suture materials such as silk,

  6. Outcomes of skin closure with suture materials in clean paediatric surgical procedures.

    PubMed

    Osifo, O D; Osagie, T O

    2011-06-01

    Except through natural orifices, all surgical operations involve making skin incisions which are often closed with suture materials to which the skin may react. This is a five-year (2005-2009) retrospective study of postoperative outcomes of 998 clean skin incisions closed with continuous subcuticular suture materials in 796 children at two Nigerian centres. The children were aged between 1 day and 18 years (mean 6.5 +/- 3.4 years) with a male to female ratio of 2.5:1. The location of the incisions ranged from groin in 678 (67.9%) cases to lower limbs in 15 (1.5%), these were associated with 414 (61.1%) and 13 (86.7%) postoperative complications respectively. Sutures were not removed from the skin in 734 cases and were associated with 558 (76%) postoperative complications whereas sutures were removed between 5-7 postoperative days in 264 cases and were associated with 39(14.8%) postoperative complications (P < 0.0001). Whereas postoperative wound infection in 69 (6.9%) cases occurred before ten days, stitch abscess/sinus, 156 (15.6%), suture extrusion, 80 (8%), hyperpigmentation, 211 (21.1%), pruritus, 182 (18.2%), hypertrophied scars, 128 (12.8%), and keloid formation, 9 (0.9%), occurred after the tenth postoperative day among those whose sutures were not removed in direct proportion to patients' age/ suture size. These postoperative complications gave rise to 343 (34.3%) good, 245 (24.5%) fair, and 9 (0.9%) poor cosmetic outcomes, whereas 401 (40.2%) incisions without postoperative complication gave excellent cosmetic outcomes. It is suggested from this study that continuous subcuticular suture materials which should be removed not later than the tenth postoperative day be used for skin closure in children. PMID:22195383

  7. Provenance of the Indus-Yarlung Suture Mélange and the Location of the India-Asia Suture, Southern Tibet

    NASA Astrophysics Data System (ADS)

    Metcalf, K.; Kapp, P. A.; Orme, D. A.; Laskowski, A. K.

    2013-12-01

    The Indus-Yarlung Suture Zone (IYSZ) is the boundary between rocks of Indian and Asian affinity. From north to south in southern Tibet, it exposes the preserved Asian forearc, ophiolitic rocks, tectonic mélanges, and Tethyan Himalayan strata of Indian affinity. The mélange has long been considered the accretionary prism corresponding to the ophiolite to the north which obducted onto the Indian margin prior to India-Asia collision. An outstanding issue is whether the ophiolitic rocks and mélanges were (1) obducted onto the northern margin of India or (2) associated with the Cordilleran-style southern margin of Asia, prior to India - Asia collision. Resolving this issue is fundamental to understanding the precollisional tectonic framework of the Neo-Tethyan realm, interpreting the timing of initial continental collision from detrital records, and locating the suture. We conducted geologic mapping and U/Pb detrital zircon provenance studies of the blocks and matrix of the mélanges and of Tethyan Himalayan units to the south at two localities: near Lhatse, which is ~140 km north of Mt. Everest and near Lopu Kangri, ~300 km along strike to the west. Near Lhatse the mélange is composed of a mudstone matrix with blocks of basalt, chert, mudstone, metabasite, limestone, and sandstone. The majority of the blocks are deep-water facies or consistent with oceanic crust, supporting the interpretation that the mélange is an accretionary complex formed by oceanic subduction. A south-dipping fault ~9 km north of Lhatse separates the mélange to the north from a continuous sequence of sandstone, shale, and minor limestone to the south. Previous work along strike suggests that this sequence, which has been previously identified as Tethyan affinity, contains Asian affinity detrital zircon populations. Near Lopu Kangri, the mélange is similar to that exposed in Lhatse. Over a distance of ~10 km to the southwest, blocks gradually increase in size to encompass ~2 km x ~10 km areas of measurable section and the component of matrix gradually decreases. Eventually the matrix is absent and strain is apparently taken up in incompetent layers within the stratigraphic sections. U/Pb dating of detrital zircons suggest that the mélange contains Asian affinity blocks with young peak ages of ~130 Ma as well as Gondwanan affinity blocks with young peak ages of ~500-550 Ma. Sandstones from the matrix are interpreted as Asian affinity with young peak ages of ~125 Ma and maximum depositional ages of ~118 Ma. The coherent blocks of stratigraphy are of Gondwanan affinity and may represent part of a microterrane which entered the subduction system at ~120 Ma. Collectively, our preliminary results suggest the mélange matrix is of Asian affinity. This requires the ophiolitic rocks and mélanges to have been associated with the Cordilleran-style margin of Asia by ~120 Ma. In contrast, blocks of stratigraphic section in the mélanges are of Gondwanan affinity, and we interpret them to represent dismembered portions of a microterrane that accreted to the southern margin of Asia prior to India-Asia collision. Finally, our studies suggest that the suture between India and Asia is further south than previously recognized.

  8. Broadband patterned magnetic microwave absorber

    SciTech Connect

    Li, Wei; Wu, Tianlong; Wang, Wei; Guan, Jianguo, E-mail: guanjg@whut.edu.cn [State Key Lab of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070 (China); Zhai, Pengcheng [School of Science, Wuhan University of Technology, Wuhan 430070 (China)

    2014-07-28

    It is a tough task to greatly improve the working bandwidth for the traditional flat microwave absorbers because of the restriction of available material parameters. In this work, a simple patterning method is proposed to drastically broaden the absorption bandwidth of a conventional magnetic absorber. As a demonstration, an ultra-broadband microwave absorber with more than 90% absorption in the frequency range of 4–40 GHz is designed and experimentally realized, which has a thin thickness of 3.7?mm and a light weight equivalent to a 2-mm-thick flat absorber. In such a patterned absorber, the broadband strong absorption is mainly originated from the simultaneous incorporation of multiple ?/4 resonances and edge diffraction effects. This work provides a facile route to greatly extend the microwave absorption bandwidth for the currently available absorbing materials.

  9. Electrochemically regenerable carbon dioxide absorber

    NASA Technical Reports Server (NTRS)

    Woods, R. R.; Marshall, R. D.; Schubert, F. H.; Heppner, D. B.

    1979-01-01

    Preliminary designs were generated for two electrochemically regenerable carbon dioxide absorber concepts. Initially, an electrochemically regenerable absorption bed concept was designed. This concept incorporated the required electrochemical regeneration components in the absorber design, permitting the absorbent to be regenerated within the absorption bed. This hardware was identified as the electrochemical absorber hardware. The second hardware concept separated the functional components of the regeneration and absorption process. This design approach minimized the extravehicular activity component volume by eliminating regeneration hardware components within the absorber. The electrochemical absorber hardware was extensively characterized for major operating parameters such as inlet carbon dioxide partial pressure, process air flow rate, operational pressure, inlet relative humidity, regeneration current density and absorption/regeneration cycle endurance testing.

  10. Broadband patterned magnetic microwave absorber

    NASA Astrophysics Data System (ADS)

    Li, Wei; Wu, Tianlong; Wang, Wei; Zhai, Pengcheng; Guan, Jianguo

    2014-07-01

    It is a tough task to greatly improve the working bandwidth for the traditional flat microwave absorbers because of the restriction of available material parameters. In this work, a simple patterning method is proposed to drastically broaden the absorption bandwidth of a conventional magnetic absorber. As a demonstration, an ultra-broadband microwave absorber with more than 90% absorption in the frequency range of 4-40 GHz is designed and experimentally realized, which has a thin thickness of 3.7 mm and a light weight equivalent to a 2-mm-thick flat absorber. In such a patterned absorber, the broadband strong absorption is mainly originated from the simultaneous incorporation of multiple ?/4 resonances and edge diffraction effects. This work provides a facile route to greatly extend the microwave absorption bandwidth for the currently available absorbing materials.

  11. Finite element analysis of barbed sutures in skin and tendon tissues.

    PubMed

    Ingle, N P; King, M W; Zikry, M A

    2010-03-22

    Barbed surgical sutures are a new type of knotless suture that are currently being used clinically in cosmetic and plastic surgery procedures for faster healing and better cosmesis. Clinical studies are also underway to evaluate their performance in other deep tissue applications. However, little is known about their intrinsic mechanical behavior and their interactions with surrounding tissues. The primary objective of the current study was to analyze the mechanical behavior of barbed sutures using a finite element analysis approach. First, the effect of applying a point-pressure load to the tip of the barb and measuring its effect on barb displacement was studied. Second, the effect of an applied displacement to a barb anchored either in skin or tendon material for both the suture and the surrounding tissue. The results indicate that the flexibility of the barb can be increased or decreased by changing the barb geometry. It was concluded that the barb geometry and design need to be modified for use with different types of tissue. For example, in order to achieve the best mechanical anchoring with skin tissue the barb should be more flexible compared to the one designed to work with tendon tissue. The uniqueness of this study is that it is the first to establish a virtual prototyping and designing method for barbed sutures. For example, a new and improved virtual design of barb geometry is proposed and validated. It also provides the first report on how to develop a virtual bench top suture/tissue pullout testing environment. PMID:20047748

  12. Subsurface geometry of the Siletz-Klamath suture in southwest Oregon from mangnetotelluric imaging

    NASA Astrophysics Data System (ADS)

    Box, S.; Bedrosian, P. A.

    2006-12-01

    Siletzia, a Paleocene to early Eocene basaltic seamount terrane, was sutured onto western North America in Eocene times and comprises the modern forearc basement throughout the Pacific Northwest. The suture zone is mostly obscured by the Cascades Arc. In southwest Oregon, however, it is preserved where previously accreted Mesozoic terranes in the Klamath Moutains overthrust Siletzia. The geometry of this suture at depth, however, is poorly constrained. In summer 2006, long-period (deep-crustal) and broadband (shallow-crustal) magnetotelluric (MT) data were collected along a 200-km profile stretching from the Pacific coast north of Coos Bay, OR to the California border south of Medford, OR, with an average site spacing of 4 km. South of the suture, the profile crosses Franciscan and Great Valley equivalents, arc lavas and sediments of the Western Klamath terrane, ophiolitic mélange of the Rattlesnake Creek terrane, and the Hayfork volcanic arc terrane, ending within the Condry Mountain Window. The data are in general agreement with the NW surface strike of the suture and the Klamath terranes. A smooth regularized two-dimensional inversion of the data resulted in a preliminary model extending to ~ 50 km depth which fits the data and is in accordance with observed surface geology. The imaged subsurface geometry of the Siletzia-Klamath suture is compared to previous potential-field modeling that suggested a thinning wedge of Silitzia has been thrust within the Klamath terranes.

  13. A technique for the quantification of the 3D connectivity of thin articulations in bony sutures.

    PubMed

    Maloul, Asmaa; Fialkov, Jeffrey; Hojjat, Seyed-Parsa; Whyne, Cari M

    2010-04-19

    The anatomy and development of cranial and facial sutures have been studied in detail using histological sections, 2D radiographs and more recently CT imaging. However, little attention has been paid to evaluating and quantifying the connectivity of these thin cortical bone articulations. More recent technological advances such as micro-CT imaging has the potential to be used to provide quantitative measurements of 3D connectivity in bony articulations. This study presents a new technique for quantifying the connectivity of bony projections inside cranial and facial sutures using a combination of skeletonization, thinning algorithms and 3D intensity mapping. The technique is demonstrated in five sutures through semi-automated analysis and image processing of microCT scans. In the sagittal, coronal and frontozygomatic sutures an average bone connectivity of 6.6-11.6% was found with multiple bony projections providing an interlocking structure between adjacent bones. Much higher bone connectivity was present in the zygomaticotemporal and zygomaticomaxillary sutures (22.7-37.4%) with few bony projections. This method combining microCT scanning and image processing techniques was successfully used to quantify the connectivity of thin bone articulations and allowed detailed assessment of sutural fusion in 3D. The wider application of this technique may allow quantification of connectivity in other structures, in particular fracture healing of long bones. PMID:20036366

  14. Outcomes of Nonpledgeted Horizontal Mattress Suture Technique for Mitral Valve Replacement

    PubMed Central

    Kim, Gun Jik; Lee, Jong Tae; Lee, Young Ok; Cho, Joon Young; Oh, Tak-Hyuk

    2014-01-01

    Background Most surgeons favor the pledgeted suture technique for heart valve replacements because they believe it decreases the risk of paravalvular leak (PVL). We hypothesized that the use of nonpledgeted rather than pledgeted sutures during mitral valve replacement (MVR) may decrease the incidence of prosthetic valve endocarditis (PVE) and risk of a major PVL. Methods We analyzed 263 patients, divided into 175 patients who underwent MVR with nonpledgeted sutures from January 2003 to December 2013 and 88 patients who underwent MVR with pledgeted sutures from January 1995 to December 2001. We compared the occurrence of PVL and PVE between these groups. Results In patients who underwent MVR with or without tricuspid valve surgery and/or a Maze operation, PVL occurred in 1.1% of the pledgeted group and 2.9% of the nonpledgeted group. The incidence of PVE was 2.9% in the nonpledgeted group and 1.1% in the pledgeted group. No differences were statistically significant. Conclusion We suggest that a nonpledgeted suture technique can be an alternative to the traditional use of pledgeted sutures in most patients who undergo MVR, with no significant difference in the incidence of PVL. PMID:25551070

  15. Efficacy of Single-Suture Incision Closures in Tagged Juvenile Chinook Salmon Exposed to Simulated Turbine Passage

    SciTech Connect

    Boyd, James W.; Deters, Katherine A.; Brown, Richard S.; Eppard, M. B.

    2011-09-01

    Reductions in the size of acoustic transmitters implanted in migrating juvenile salmonids have resulted in the use of a shorter incision-one that may warrant only a single suture for closure. However, it is not known whether a single suture will sufficiently hold the incision closed when fish are decompressed and when outward pressure is placed on the surgical site during turbine passage through hydroelectric dams. The objective of this study was to evaluate the effectiveness of single-suture incision closures on five response variables in juvenile Chinook salmon Oncorhynchus tshawytscha that were subjected to simulated turbine passage. An acoustic transmitter (0.43 g in air) and a passive integrated transponder tag (0.10 g in air) were implanted in each fish; the 6-mm incisions were closed with either one suture or two sutures. After exposure to simulated turbine passage, none of the fish exhibited expulsion of transmitters. In addition, the percentage of fish with suture tearing, incision tearing, or mortal injury did not differ between treatments. Expulsion of viscera through the incision was higher among fish that received one suture (12%) than among fish that received two sutures (1%). The higher incidence of visceral expulsion through single-suture incisions warrants concern. Consequently, for cases in which tagged juvenile salmonidsmay be exposed to turbine passage, we do not recommend the use of one suture to close 6-mm incisions associated with acoustic transmitter implantation.

  16. Ultrastructure, Histochemistry, and Mineralization Patterns in the Ecdysial Suture of the Blue Crab, Callinectes sapidus

    NASA Astrophysics Data System (ADS)

    Priester, Carolina; Dillaman, Richard M.; Gay, D. Mark

    2005-12-01

    The ecdysial suture is the region of the arthropod exoskeleton that splits to allow the animal to emerge during ecdysis. We examined the morphology and composition of the intermolt and premolt suture of the blue crab using light microscopy and scanning electron microscopy. The suture could not be identified by routine histological techniques; however 3 of 22 fluorescein isothiocyanate-labeled lectins tested (Lens culinaris agglutinin, Vicia faba agglutinin, and Pisum sativum agglutinin) differentiated the suture, binding more intensely to the suture exocuticle and less intensely to the suture endocuticle. Back-scattered electron (BSE) and secondary electron observations of fracture surfaces of intermolt cuticle showed less mineralized regions in the wedge-shaped suture as did BSE analysis of premolt and intermolt resin-embedded cuticle. The prism regions of the suture exocuticle were not calcified. X-ray microanalysis of both the endocuticle and exocuticle demonstrated that the suture was less calcified than the surrounding cuticle with significantly lower magnesium and phosphorus concentrations, potentially making its mineral more soluble. The presence or absence of a glycoprotein in the organic matrix, the extent and composition of the mineral deposited, and the thickness of the cuticle all likely contribute to the suture being removed by molting fluid, thereby ensuring successful ecdysis.

  17. Plants absorb heavy metals

    SciTech Connect

    Parry, J.

    1995-02-01

    Decontamination of heavy metals-polluted soils remains one of the most intractable problems of cleanup technology. Currently available techniques include extraction of the metals by physical and chemical means, such as acid leaching and electroosmosis, or immobilization by vitrification. There are presently no techniques for cleanup which are low cost and retain soil fertility after metals removal. But a solution to the problem could be on the horizon. A small but growing number of plants native to metalliferous soils are known to be capable of accumulating extremely high concentrations of metals in their aboveground portions. These hyperaccumulators, as they are called, contain up to 1,000 times larger metal concentrations in their aboveground parts than normal species. Their distribution is global, including many different families of flowering plants of varying growth forms, from herbaceous plants to trees. Hyperaccumulators absorb metals they do not need for their own nutrition. The metals are accumulated in the leaf and stem vacuoles, and to a lesser extent in the roots.

  18. Improvement Of The Helmholtz Absorber

    NASA Technical Reports Server (NTRS)

    Morrow, Duane L.

    1992-01-01

    Helmholtz-resonator system improved to enable it to absorb sound at more than one frequency without appreciable loss of effectiveness at primary frequency. Addition of annular cavities enables absorption of sound at harmonic frequencies in addition to primary frequency. Improved absorber designed for use on structures of high transmission loss. Applied to such machines as fixed-speed engines and fans.

  19. Black liquid absorbing solar collector

    Microsoft Academic Search

    Mattson

    1980-01-01

    A description is given of a solar to thermal energy converter for use in solar energy collector systems comprising an upper and lower surfaces transparent to solar energy and defining a plurality of elongate channel means therebetween for exposing a solar energy absorber heat transfer fluid to solar radiation, a solar energy absorber heat transfer fluid comprisng a black liquid

  20. Sutures versus staples for wound closure in orthopaedic surgery: a pilot randomized controlled trial

    PubMed Central

    2013-01-01

    Background In the spectrum of surgical decision-making, wound closure material is often an afterthought. However, the findings of a recent meta-analysis suggest that the rate of surgical site infections (SSIs) is increased by using staples to close surgical wounds. Less clear is the effect of closure material on the incidence of non-infectious wound complications. The aim of this study was to compare sutures and staples in terms of: incidence of wound complications to determine the sample size for a definitive trial comparing wound closure methods. Methods Eligible adult orthopaedic patients were randomized to have wounds closed with sutures or staples. Time for skin closure was recorded. Wounds were assessed for complications for six weeks. The incidence of complications was compared using Fisher’s exact test. Time to close and pain with removal of closure material were compared using a Student’s t-test. Results The total number of patients reporting a wound complication was 59 of 148 patients completing six-week followup (41%), with no differennce between sutures and staples (RR = 0.77, CI = 0.52–1.14). The time to close wounds was shorter in the staple group (mean=4.8 min, CI = 2.6–7.1) than the suture group (mean=12 min, CI = 7.9–16). Patients in the staple group (mean=3.7, CI =2.8–4.6) reported more pain with removal than suture group (mean=2.5, CI =1.6–3.4). Conclusions This study suggests that 42% of patients report a wound complication with no difference between sutures and staples. It was demonstrated that suturing skin requires more time and staples are more painful to remove. Trial registration Clinicaltrials.gov identifier NCT01146236 (registered June 14, 2010) PMID:23394586

  1. Proterozoic Farwell Mountain Lester Mountain suture zone, northern Colorado: Subduction flip and progressive assembly of arcs

    NASA Astrophysics Data System (ADS)

    Tyson, A. R.; Morozova, E. A.; Karlstrom, K. E.; Dueker, K. R. Chamberlain S. B. Smithson K. G.; Foster, C. T.

    2002-10-01

    This paper considers the amalgamation of arc and oceanic terranes to be the main mechanism of ca. 1.8 1.6 Ga continental crustal growth in southwestern Laurentia. On the basis of geologic and seismic reflection data and teleseismic images, we propose the Farwell Mountain Lester Mountain suture zone as the northernmost Paleoproterozoic arc-arc suture. North-dipping (Farwell Mountain) seismic reflections project from 18 km depths to the surface and are interpreted to represent conjugate thrusting as the 1.79 1.77 Ga Green Mountain arc was partially underthrust beneath the Archean craton. We speculate that a north-dipping high-velocity mantle “slab” in the teleseismic image is a continuation of this thrust zone. South-dipping (Lester Mountain) reflections project from 22 km depths to the surface and are interpreted to be a thrust zone between the Green Mountain arc and the 1.76 1.72 Ga Rawah block. Surface features of the Farwell Mountain Lester Mountain suture zone are (1) marble, chert, rock with sillimanite pods, ultramafic rocks, sulfide deposits, and pillow basalts, which we interpret to be a dismembered accretionary complex; (2) an axial-planar fabric to north-verging isoclinal folds (F2), which we interpret to be part of a north-vergent fold-and-thrust system; and (3) a metamorphic break between ˜500 °C rocks to the north and ˜610 °C rocks to the south, which we attribute to reactivation of the zone. Movement on the Farwell Mountain backthrust is inferred to relate to Cheyenne belt suturing at 1.78 1.75 Ga. We correlate suturing in the Farwell Mountain Lester Mountain suture zone to S1/D1 (1.746 1.74 Ga) in the Soda Creek Fish Creek shear zone. We attribute the complexity of this broad suture zone to initial conjugate thrusting, plus overprinting and steepening of accretionary structures by subsequent tectonism.

  2. Comparison of CO2 laser welding with suture technique for repair of tendons

    NASA Astrophysics Data System (ADS)

    Popovic, Neven A.; Johnstone, Frederic L.; Kilkelly, Francis X.; McKinney, LuAnn; Van De Merwe, Willem P.; Smith, Allan C.

    1995-05-01

    The purpose of this study was to evaluate the efficacy, histology, and strength of laser welding in repair of sharply transected rat Achilles tendons. In 26 adult, male Sprague-Dawley rats, the severed tendons were repaired with a 7-0 nylon, modified Kessler core suture followed by either a running 9-0 nylon epitendinous suture or a circumferential CO2 laser epidendinous weld using 25% human albumin as a solder. All repairs were timed and post- operative tensile strength was analyzed with material testing equipment. In addition, histologic testing was performed on both types of repairs. The mean time to complete the epitendinous repair in the laser group was 3.5 minutes and in the suture group, 8 minutes. The mean ultimate tensile strength in 6 normal tendons was 40.9 Newtons (N) with group standard deviation of 5.2 N. When compared with normal controls, post-operatively both types of tendon repairs resulted in tensile failure at lower forces. The ultimate tensile strength for the epitendinous suture repair and the laser welds were 13% and 6% of normal controls, respectively. Twenty tendons with epidendinous suture repair had mean ultimate tensile strength of 5.4 (+/- 1.2) N, while the 17 tendons with laser wends failed at 2.6 (+/- 0.9) N. Histologic evaluation of tendons repaired with CO2 laser revealed areas of coagulation and edema on the surface of tendon edges. Post-operatively, greater tissue changes were noted in laser treated tendons than those repaired with sutures. Laser welding of epitenon is possible and can be completed faster than the suture repair. The repaired tendon surface appears smoother and less bulky after laser treatment. However, significantly decreased immediate post-operative strength was demonstrated by the use of Kruskal-Wallis one way analysis of variance and Turkey's pairwise comparison.

  3. Leaf absorbance and photosynthesis

    NASA Technical Reports Server (NTRS)

    Schurer, Kees

    1994-01-01

    The absorption spectrum of a leaf is often thought to contain some clues to the photosynthetic action spectrum of chlorophyll. Of course, absorption of photons is needed for photosynthesis, but the reverse, photosynthesis when there is absorption, is not necessarily true. As a check on the existence of absorption limits we measured spectra for a few different leaves. Two techniques for measuring absorption have been used, viz. the separate determination of the diffuse reflectance and the diffuse transmittance with the leaf at a port of an integrating sphere and the direct determination of the non-absorbed fraction with the leaf in the sphere. In a cross-check both methods yielded the same results for the absorption spectrum. The spectrum of a Fuchsia leaf, covering the short-wave region from 350 to 2500 nm, shows a high absorption in UV, blue and red, the well known dip in the green and a steep fall-off at 700 nm. Absorption drops to virtually zero in the near infrared, with subsequent absorptions, corresponding to the water absorption bands. In more detailed spectra, taken at 5 nm intervals with a 5 nm bandwidth, differences in chlorophyll content show in the different depths of the dip around 550 nm and in a small shift of the absorption edge at 700 nm. Spectra for Geranium (Pelargonium zonale) and Hibiscus (with a higher chlorophyll content) show that the upper limit for photosynthesis can not be much above 700 nm. No evidence, however, is to be seen of a lower limit for photosynthesis and, in fact, some experiments down to 300 nm still did not show a decrease of the absorption although it is well recognized that no photosynthesis results with 300 nm wavelengths.

  4. Mandibular form in a rabbit model of familial nonsyndromic coronal suture synostosis.

    PubMed

    Burrows, Anne M; Cole, Theodore M; Mooney, Mark P; Smith, Timothy D; Losken, H Wolfgang; Siegel, Michael I

    2002-03-01

    Nonsyndromic coronal suture synostosis produces predictable and well-documented morphologies of the cranial vault with anteroposterior growth restrictions and mediolateral compensatory growth. The potential effects of nonsyndromic coronal suture synostosis on mandibular form are not as clear, however. This study was designed to evaluate whether coronal suture synostosis is associated with alterations in mandibular form by using a familial rabbit model of coronal suture synostosis. To assess this potential relation, the following hypothesis was tested: mandibular form in rabbits with coronal suture synostosis is significantly (P < 0.05) different from that seen in normal rabbits. The cleaned and dried mandibles of 33 adult New Zealand white rabbits were used (12 from normal rabbits, 13 from rabbits with delayed-onset synostosis, and 8 from rabbits with complete coronal suture synostosis). Seven anatomical landmarks on the mandible were located and digitized in three dimensions: anterior molar on the alveolus, posterior molar on the alveolus, coronoid process, anterior pole of the condyle, condylar process, angular process, and mandibular angle. To describe the mandibular condyle, the distance from the anterior pole to the posterior pole of the condyle was measured with digital sliding calipers, as was the distance between the medial and lateral poles. A shape ratio was then created using the dividend of these sums. Statistical analyses of mean form differences between mandibles were executed using Euclidean distance matrix analysis. Statistical analyses of the mandibular condyle linear and shape measurements were analyzed using one-way ANOVA in the three groups. Results showed that complete coronal suture synostosis is associated with significant (P < 0.05) differences in mandibular form compared with that of normal rabbits but that mandibular form in rabbits with delayed-onset synostosis does not differ from that of normal rabbits (P > 0.05). In particular, distances involving the coronoid process in rabbits with coronal suture synostosis were significantly different, paralleling previous work in human patients with coronal synostosis. There are no intrinsic condylar linear or shape differences between any of these groups, however. The form difference noted is most likely secondary to the synostosed coronal suture and may reflect alterations in the cranial base or masticatory musculature in this rabbit model. PMID:12000881

  5. Absorbent product to absorb fluids. [for collection of human wastes

    NASA Technical Reports Server (NTRS)

    Dawn, F. S.; Correale, J. V. (inventors)

    1982-01-01

    A multi-layer absorbent product for use in contact with the skin to absorb fluids is discussed. The product utilizes a water pervious facing layer for contacting the skin, overlayed by a first fibrous wicking layer, the wicking layer preferably being of the one-way variety in which fluid or liquid is moved away from the facing layer. The product further includes a first container section defined by inner and outer layer of a water pervious wicking material between which is disposed a first absorbent mass. A second container section defined by inner and outer layers between which is disposed a second absorbent mass and a liquid impermeable/gas permeable layer. Spacesuit applications are discussed.

  6. The Effect of the Trabecular Microstructure on the Pullout Strength of Suture Anchors

    PubMed Central

    Yakacki, Christopher M.; Poukalova, Mariya; Guldberg, Robert E.; Lin, Angela; Saing, Minn; Gillogly, Scott; Gall, Ken

    2010-01-01

    This study investigates how the microstructural properties of trabecular bone affect suture anchor performance. Seven fresh-frozen humeri were tested for pullout strength with a 5 mm Arthrex Corkscrew in the greater tuberosity, lesser tuberosity, and humeral head. Micro-computed tomography analysis was performed in the three regions of interest directly adjacent to individual pullout experiments. The morphometric properties of bone mineral density (BMD), structural model index (SMI), trabecular thickness (TbTh), trabecular spacing (TbS), trabecular number (TbN), and connectivity density were compared against suture anchor pullout strength. BMD (r = 0.64), SMI (r = -0.81), and TbTh (r = 0.71) showed linear correlations to the pullout strength of the suture anchor with p-values < 0.0001. A predictive model was developed to explain the variances in the individual BMD, SMI, and TbTh correlations. The multi-variant model of pullout strength showed a stronger relationship (r = 0.86) compared to the individual experimental results. This study helps confirm BMD is a major influence on the pullout strength of suture anchors, but also illustrates the importance of local microstructure in pullout resistance of suture anchors. PMID:20399431

  7. thin films as absorber

    NASA Astrophysics Data System (ADS)

    González, J. O.; Shaji, S.; Avellaneda, D.; Castillo, G. A.; Das Roy, T. K.; Krishnan, B.

    2014-09-01

    Photovoltaic structures were prepared using AgSb(S x Se1- x )2 as absorber and CdS as window layer at various conditions via a hybrid technique of chemical bath deposition and thermal evaporation followed by heat treatments. Silver antimony sulfo selenide thin films [AgSb(S x Se1- x )2] were prepared by heating multilayers of sequentially deposited Sb2S3/Ag dipped in Na2SeSO3 solution, glass/Sb2S3/Ag/Se. For this, Sb2S3 thin films were deposited from a chemical bath containing SbCl3 and Na2S2O3. Then, Ag thin films were thermally evaporated on glass/Sb2S3, followed by selenization by dipping in an acidic solution of Na2SeSO3. The duration of dipping was varied as 3, 4 and 5 h. Two different heat treatments, one at 350 °C for 20 min in vacuum followed by a post-heat treatment at 325 °C for 2 h in Ar, and the other at 350 °C for 1 h in Ar, were applied to the multilayers of different configurations. X-ray diffraction results showed the formation of AgSb(S x Se1- x )2 thin films as the primary phase and AgSb(S,Se)2 and Sb2S3 as secondary phases. Morphology and elemental detection were done by scanning electron microscopy and energy dispersive X-ray analysis. X-ray photoelectron spectroscopic studies showed the depthwise composition of the films. Optical properties were determined by UV-vis-IR transmittance and reflection spectral analysis. AgSb(S x Se1- x )2 formed at different conditions was incorporated in PV structures glass/FTO/CdS/AgSb(S x Se1- x )2/C/Ag. Chemically deposited post-annealed CdS thin films of various thicknesses were used as window layer. J- V characteristics of the cells were measured under dark and AM1.5 illumination. Analysis of the J- V characteristics resulted in the best solar cell parameters of V oc = 520 mV, J sc = 9.70 mA cm-2, FF = 0.50 and ? = 2.7 %.

  8. Self-Regulating Shock Absorber

    NASA Technical Reports Server (NTRS)

    Wesselski, Clarence J.

    1995-01-01

    Mechanical shock absorber keeps frictional damping force within tolerable limit. Its damping force does not increase with coefficient of friction between energy-absorbing components; rather, frictional damping force varies only slightly. Relatively insensitive to manufacturing variations and environmental conditions altering friction. Does not exhibit high breakaway friction and consequent sharp increase followed by sharp decrease in damping force at beginning of stroking. Damping force in absorber does not vary appreciably with speed of stroking. In addition, not vulnerable to leakage of hydraulic fluid.

  9. Novel High Efficient Coatings for Anti-Microbial Surgical Sutures Using Chlorhexidine in Fatty Acid Slow-Release Carrier Systems

    PubMed Central

    Obermeier, Andreas; Schneider, Jochen; Wehner, Steffen; Matl, Florian Dominik; Schieker, Matthias; von Eisenhart-Rothe, Rüdiger; Stemberger, Axel; Burgkart, Rainer

    2014-01-01

    Sutures can cause challenging surgical site infections, due to capillary effects resulting in bacteria permeating wounds. Anti-microbial sutures may avoid these complications by inhibiting bacterial pathogens. Recently, first triclosan-resistances were reported and therefore alternative substances are becoming clinically relevant. As triclosan alternative chlorhexidine, the “gold standard” in oral antiseptics was used. The aim of the study was to optimize novel slow release chlorhexidine coatings based on fatty acids in surgical sutures, to reach a high anti-microbial efficacy and simultaneously high biocompatibility. Sutures were coated with chlorhexidine laurate and chlorhexidine palmitate solutions leading to 11, 22 or 33 µg/cm drug concentration per length. Drug release profiles were determined in aqueous elutions. Antibacterial efficacy against Staphylococcus aureus was assessed in agar diffusion tests. Biocompatibility was evaluated via established cytotoxicity assay (WST-1). A commercially triclosan-containing suture (Vicryl Plus), was used as anti-microbial reference. All coated sutures fulfilled European Pharmacopoeia required tensile strength and proved continuous slow drug release over 96 hours without complete wash out of the coated drug. High anti-microbial efficacy for up to 5 days was observed. Regarding biocompatibility, sutures using 11 µg/cm drug content displayed acceptable cytotoxic levels according to ISO 10993-5. The highest potential for human application were shown by the 11 µg/cm chlorhexidine coated sutures with palmitic acid. These novel coated sutures might be alternatives to already established anti-microbial sutures such as Vicryl Plus in case of triclosan-resistance. Chlorhexidine is already an established oral antiseptic, safety and efficacy should be proven for clinical applications in anti-microbial sutures. PMID:24983633

  10. Calvarial defects in the region of the lambdoid suture in neurofibromatosis type-1 patients

    PubMed Central

    Solanki, Chirag; Ramachandran, Sudheesh; Devi, Bhagvatula Indira; Sharma, Rajeev

    2015-01-01

    Rare type of calvarial defects seen in patients with neurofibromatosis type-1 (NF1) is presented. The issues of pathogenesis and management are discussed. Two cases of NF1 with skull defects in the region of the lambdoid suture are reported. The possible etiological basis and nature of these type of defects and management issues are discussed. The calvarial skull defects in the lambdoid suture region are rare defects in NF1 patients. The possible reason of the progressive nature of these type of lesions can be the cerebrospinal fluid pulsations behaving like “growing skull fractures,” especially when not associated with structural lesions. It leads to progressive enlargement of the small congenital defects in the region of the lambdoid suture and abnormal susceptibility of bones for resorption. For these defects, conservative management is suggested due to its progressive nature and high chances of operative treatment failure.

  11. Light-guided localization within tissue using biocompatible surgical suture fiber as an optical waveguide

    NASA Astrophysics Data System (ADS)

    Choi, Woo June; Park, Kwan Seob; Lee, Byeong Ha

    2014-09-01

    In breast-conserving surgery, an optical wire is a useful surgical guiding tool to optically locate small lesions within the breast tissue. However, the use of a long silica glass fiber as the optical wire can be burdensome to patients because of its stiffness and nonbiocompatibility. We investigate the use of a biocompatible fiber for light localization in tissue. A surgical suture with a diameter of 400 ?m and a few centimeters long is employed as the biocompatible optical waveguide to transport the visible laser light to the inner tissue site. Optical location is confirmed with glow ball-like red laser illumination at the tip of the suture embedded within a fresh chicken breast tissue. Effective optical power coupling to the suture is made by using a double-cladding fiber coupler. From this preliminary result, we realize practical light localization with biopolymer waveguides.

  12. Arthroscopic 4-Point Suture Fixation of Anterior Cruciate Ligament Tibial Avulsion Fractures

    PubMed Central

    Boutsiadis, Achilleas; Karataglis, Dimitrios; Agathangelidis, Filon; Ditsios, Konstantinos; Papadopoulos, Pericles

    2014-01-01

    Tibial eminence avulsion fractures are rare injuries occurring mainly in adolescents and young adults. When necessary, regardless of patient age, anatomic reduction and stable internal fixation are mandatory for fracture healing and accurate restoration of normal knee biomechanics. Various arthroscopically assisted fixation methods with sutures, anchors, wires, or screws have been described but can be technically demanding, thus elongating operative times. The purpose of this article is to present a technical variation of arthroscopic suture fixation of anterior cruciate ligament avulsion fractures. Using thoracic drain needles over 2.4-mm anterior cruciate ligament tibial guidewires, we recommend the safe and easy creation of four 2.9-mm tibial tunnels at different angles and at specific points. This technique uses thoracic drain needles as suture passage cannulas and offers 4-point fixation stability, avoiding potential complications of bony bridge fracture and tunnel connection. PMID:25685674

  13. Light-guided localization within tissue using biocompatible surgical suture fiber as an optical waveguide.

    PubMed

    Choi, Woo June; Park, Kwan Seob; Lee, Byeong Ha

    2014-09-01

    In breast-conserving surgery, an optical wire is a useful surgical guiding tool to optically locate small lesions within the breast tissue. However, the use of a long silica glass fiber as the optical wire can be burdensome to patients because of its stiffness and nonbiocompatibility. We investigate the use of a biocompatible fiber for light localization in tissue. A surgical suture with a diameter of 400 ?m and a few centimeters long is employed as the biocompatible optical waveguide to transport the visible laser light to the inner tissue site. Optical location is confirmed with glow ball-like red laser illumination at the tip of the suture embedded within a fresh chicken breast tissue. Effective optical power coupling to the suture is made by using a double-cladding fiber coupler. From this preliminary result, we realize practical light localization with biopolymer waveguides. PMID:25202898

  14. Performance Assessment of Suture Type in Juvenile Chinook Salmon Surgically Implanted with Acoustic Transmitters

    SciTech Connect

    Deters, Katherine A.; Brown, Richard S.; Carter, Kathleen M.; Boyd, James W.

    2009-02-27

    The objective of this study was to determine the best overall suture material to close incisions from the surgical implantation of Juvenile Salmon Acoustic Telemetry System (JSATS) acoustic microtransmitters in subyearling Chinook salmon Oncorhynchus tshawytscha. The effects of seven suture materials, four surgeons, and two water temperatures on suture retention, incision openness, tag retention, tissue inflammation, and tissue ulceration were quantified. The laboratory study, conducted by researchers at the Pacific Northwest National Laboratory, supports a larger effort under way for the U.S. Army Corps of Engineers, Portland District, aimed at determining the suitability of acoustic telemetry for estimating short- and longer-term (30-60 days) juvenile-salmonid survival at Columbia and Snake River dams and through the lower Columbia River.

  15. Prevalence of biofilms on surgical suture segments in wounds of dogs, cats, and horses.

    PubMed

    König, L; Klopfleisch, R; Kershaw, O; Gruber, A D

    2015-03-01

    The formation of biofilms on surgical implants is thought to play a major role in chronic infection and wound-healing disorders and has been rarely described in veterinary medicine. Due to poor and unreliable results from bacterial culturing, histology may be an economic tool for the detection of biofilms. In this study, the prevalence of biofilms on surgical suture materials and swabs with chronic wound-healing complications in dogs, cats, and horses was assessed by histologic examination using hematoxylin and eosin, Gram, and Giemsa stains, as well as periodic acid-Schiff reaction. Of the 91 tissue samples with intralesional suture material or swab residues associated with inflammation, only 2 contained bacterial colonies arranged in an extracellular polymeric matrix consistent with a biofilm. The results of this study suggest that biofilms on suture material may occur in veterinary medicine. PMID:24994621

  16. Review in Sound Absorbing Materials

    Microsoft Academic Search

    X. Sagartzazu; L. Hervella-Nieto; J. M. Pagalday

    2007-01-01

    This article is a bibliographical revision concerning acoustic absorbing materials, also known as poroelastics. These absorbing\\u000a materials are a passive medium use extensively in the industry to reduce noise. This review presents the fundamental parameters\\u000a that define each of the parts comprising these materials, as well as current experimental methods used to measure said parameters.\\u000a Further along, we will analyze

  17. Hyperuniformity of Critical Absorbing States

    NASA Astrophysics Data System (ADS)

    Hexner, Daniel; Levine, Dov

    2015-03-01

    The properties of the absorbing states of nonequilibrium models belonging to the conserved directed percolation universality class are studied. We find that, at the critical point, the absorbing states are hyperuniform, exhibiting anomalously small density fluctuations. The exponent characterizing the fluctuations is measured numerically, a scaling relation to other known exponents is suggested, and a new correlation length relating to this ordering is proposed. These results may have relevance to photonic band-gap materials.

  18. Countercurrent flow absorber and desorber

    DOEpatents

    Wilkinson, W.H.

    1984-10-16

    Countercurrent flow absorber and desorber devices are provided for use in absorption cycle refrigeration systems and thermal boosting systems. The devices have increased residence time and surface area resulting in improved heat and mass transfer characteristics. The apparatuses may be incorporated into open cycle thermal boosting systems in which steam serves both as the refrigerant vapor which is supplied to the absorber section and as the supply of heat to drive the desorber section of the system. 9 figs.

  19. 21 CFR 872.6050 - Saliva absorber.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... 2010-04-01 2010-04-01 false Saliva absorber. 872.6050 Section 872.6050...DEVICES Miscellaneous Devices § 872.6050 Saliva absorber. (a) Identification. A saliva absorber is a device made of paper or...

  20. 21 CFR 872.6050 - Saliva absorber.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ... 2011-04-01 2011-04-01 false Saliva absorber. 872.6050 Section 872.6050...DEVICES Miscellaneous Devices § 872.6050 Saliva absorber. (a) Identification. A saliva absorber is a device made of paper or...

  1. 21 CFR 872.6050 - Saliva absorber.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ... 2014-04-01 2014-04-01 false Saliva absorber. 872.6050 Section 872.6050...DEVICES Miscellaneous Devices § 872.6050 Saliva absorber. (a) Identification. A saliva absorber is a device made of paper or...

  2. 21 CFR 872.6050 - Saliva absorber.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ... 2012-04-01 2012-04-01 false Saliva absorber. 872.6050 Section 872.6050...DEVICES Miscellaneous Devices § 872.6050 Saliva absorber. (a) Identification. A saliva absorber is a device made of paper or...

  3. 21 CFR 872.6050 - Saliva absorber.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ... 2013-04-01 2013-04-01 false Saliva absorber. 872.6050 Section 872.6050...DEVICES Miscellaneous Devices § 872.6050 Saliva absorber. (a) Identification. A saliva absorber is a device made of paper or...

  4. Self-tapping ability of carbon fibre reinforced polyetheretherketone suture anchors.

    PubMed

    Feerick, Emer M; Wilson, Joanne; Jarman-Smith, Marcus; Ó'Brádaigh, Conchur M; McGarry, J Patrick

    2014-10-01

    An experimental and computational investigation of the self-tapping ability of carbon fibre reinforced polyetheretherketone (CFR-PEEK) has been conducted. Six CFR-PEEK suture anchor designs were investigated using PEEK-OPTIMA® Reinforced, a medical grade of CFR-PEEK. Experimental tests were conducted to investigate the maximum axial force and torque required for self-taping insertion of each anchor design. Additional experimental tests were conducted for some anchor designs using pilot holes. Computational simulations were conducted to determine the maximum stress in each anchor design at various stages of insertion. Simulations also were performed to investigate the effect of wall thickness in the anchor head. The maximum axial force required to insert a self-tapping CFR-PEEK suture anchor did not exceed 150?N for any anchor design. The maximum torque required to insert a self-tapping CFR-PEEK suture anchor did not exceed 0.8?Nm. Computational simulations reveal significant stress concentrations in the region of the anchor tip, demonstrating that a re-design of the tip geometry should be performed to avoid fracture during self-tapping, as observed in the experimental component of this study. This study demonstrates the ability of PEEK-OPTIMA Reinforced suture anchors to self-tap polyurethane foam bone analogue. This provides motivation to further investigate the self-tapping ability of CFR-PEEK suture anchors in animal/cadaveric bone. An optimised design for CFR-PEEK suture anchors offers the advantages of radiolucency, and mechanical properties similar to bone with the ability to self-tap. This may have positive implications for reducing surgery times and the associated costs with the procedure. PMID:24825760

  5. Long-Term Safety and Visual Outcomes of Transscleral Sutured Posterior Chamber IOLs and Penetrating Keratoplasty Combined with Transscleral Sutured Posterior Chamber IOLs

    PubMed Central

    Nottage, Jennifer Marie; Bhasin, Vikram; Nirankari, Verinder S.

    2009-01-01

    Purpose: To evaluate the outcomes of consecutive patients who underwent transscleral sutured posterior chamber intraocular lens (TS PCIOL) implantation as well as patients who had combined penetrating keratoplasty (PK) and TS PCIOL. Methods: Data from all patients who had sutured PCIOL insertion performed by the same surgeon (V.S.N.) between January 2003 and June 2007 were compiled and analyzed. Results: Group 1 consisted of 69 eyes of 67 patients who had TS PCIOL only. Mean age was 65.1 years, and mean follow-up was 14.25 months. Mean best spectacle-corrected visual acuity (BSCVA) was 20/80 preoperatively and 20/40 postoperatively. Group 2 consisted of 38 eyes of 37 patients who had combined PK and TS PCIOL. Mean age was 70.21 years, and mean follow-up was 14.29 months. Mean BSCVA was <20/250 preoperatively and between 20/70 and 20/80 postoperatively. In both groups, there were no reported cases of choroidal hemorrhage or hyphema. There was one case (0.9%) of suture erosion (group 1). There were no redislocations, lens tilting, suture breakage, or graft rejections. Postoperative complications included uveitis in 1 eye (0.9%), glaucoma in 5 (4.7%), cystoid macular edema in 6 (5.6%), and retinal detachment in 2 (1.9%). Conclusions: The TS PCIOL procedure, as done by the ab externo method, is safe and effective. It has few intraoperative or postoperative complications, and it improves visual acuity in patients requiring either TS PCIOL alone or combined PK and TS PCIOL. Ultimately, in considering TS PCIOL, patient selection, surgical method, and the surgeon’s comfort with the technique must be weighed. PMID:20126501

  6. [Experience of twenty-one cases of tracheo-bronchoplasty].

    PubMed

    Minamiya, Y; Saito, H; Ogawa, J

    2008-10-01

    Twenty-one cases of tracheo-bronchoplasty were performed in Akita University Hospital from 1997 to 2007. There are 14 cases of squamous cell carcinoma, 3 cases of adenocarcinoma, 2 cases of adenoid cystic carcinoma, 1 case of inflammatory tracheal stenosis, and 1 case of inflammatory bronchial stenosis. We performed 12 cases of right upper sleeve lobectomy, 4 cases of left upper sleeve lobectomy, 2 cases of left lower sleeve lobectomy, 1 case of right sleeve pneumonectomy, and 2 cases of tracheoplasty. Of 3 cases, we added sleeve resection of pulmonary artery. The ends of the bronchus are anastomosed end-to-end. The bronchial anastomotic suture was carried out peri-cartilaginously through all layers using an interrupted suture technique except for membranous portion. Membranous portion was sutured a continuous anastomotic technique. We use monofilament, absorbable suture material. PMID:18939426

  7. Mushroom plasmonic metamaterial infrared absorbers

    NASA Astrophysics Data System (ADS)

    Ogawa, Shinpei; Fujisawa, Daisuke; Hata, Hisatoshi; Uetsuki, Mitsuharu; Misaki, Koji; Kimata, Masafumi

    2015-01-01

    There has been a considerable amount of interest in the development of various types of electromagnetic wave absorbers for use in different wavelength ranges. In particular, infrared (IR) absorbers with wavelength selectivity can be applied to advanced uncooled IR sensors, which would be capable of identifying objects through their radiation spectrum. In the present study, mushroom plasmonic metamaterial absorbers (MPMAs) for the IR wavelength region were designed and fabricated. The MPMAs consist of a periodic array of thin metal micropatches connected to a thin metal plate with narrow silicon (Si) posts. A Si post height of 200 nm was achieved by isotropic XeF2 etching of a thin Si layer sandwiched between metal plates. This fabrication procedure is relatively simple and is consistent with complementary metal oxide semiconductor technology. The absorption spectra of the fabricated MPMAs were experimentally measured. In addition, theoretical calculations of their absorption properties were conducted using rigorous coupled wave analysis. Both the calculated and measured absorbance results demonstrated that these MPMAs can realize strong selective absorption at wavelengths beyond the period of the array by varying the micropatch width. Absorbance values greater than 90% were achieved. Dual- or single-mode absorption can also be selected by varying the width of the Si posts. Pixel structures using such MPMAs could be used as high responsivity, high resolution and fast uncooled IR sensors.

  8. Significantly Reducing Post-Tonsillectomy Haemorrhage Requiring Surgery by Suturing the Faucial Pillars: A Retrospective Analysis

    PubMed Central

    Senska, Götz; Schröder, Hilal; Pütter, Carolin; Dost, Philipp

    2012-01-01

    Background The tonsillectomy is one of the most frequently performed surgical procedures. Given the comparatively frequent postsurgical bleeding associated with this procedure, particular attention has been paid to reduction of the postoperative bleeding rate. In 2006, we introduced routine suturing of the faucial pillars at our clinic to reduce postoperative haemorrhage. Methods Two groups from the years 2003–2005 (n?=?1000) and 2007–2009 (n?=?1000) have been compared. We included all patients who had an elective tonsillectomy due to a benign, non-acute inflammatory tonsil illness. In the years 2007–2009, we additionally sutured the faucial pillars after completing haemostasis. For primary haemostasis we used suture ligation and bipolar diathermy. Results The rate of bleeding requiring second surgery for haemostasis was 3.6% in 2003–2005 but only 2.0% in 2007–2009 (absolute risk reduction 1.6% (95% CI 0.22%–2.45%, p?=?0.04)). The median surgery time—including adenoidectomy and paracentesis surgery—increased from 25 to 31 minutes (p<0.01). Conclusions We have been able to substantiate that suturing of the faucial pillars nearly halves the rate of postoperative haemorrhage. Surgery takes 8 minutes longer on average. Bleeding occurs later, mostly after 24 h. The limitations of this study relate to its retrospective character and all the potential biases related to observational studies. PMID:23118902

  9. Mode of failure for rotator cuff repair with suture anchors identified at revision surgery

    Microsoft Academic Search

    Craig A. Cummins; George A. C. Murrell

    2003-01-01

    Rotator cuff tears are a common cause of shoulder pain and dysfunction. After surgical repair, there is a significant re-tear rate (25%-90%). The aim of this study was to determine the primary mode of mechanical failure for rotator cuffs repaired with suture anchors at the time of revision rotator cuff repair. We prospectively followed 342 consecutive torn rotator cuffs, repaired

  10. Percutaneous Retrieval of a Central Venous Catheter Sutured to the Wall of the Right Atrium

    SciTech Connect

    Neuerburg, Joerg-M.; Guenther, Rolf W. [Department of Diagnostic Radiology, University of Technology Aachen, Pauwelsstrasse 30, D-52057 Aachen (Germany); Chalabi, Khaled [Department of Vascular and Thoracic Surgery, University of Technology Aachen, Pauwelsstrasse 30, D-52057 Aachen (Germany); Hunter, David [Department of Radiology, Fairview-University Medical Center, 420 Delaware Street S.E., Box 292, Minneapolis, MN 55455 (United States)

    1999-01-15

    A transjugular central venous catheter was inadvertently sutured to the wall of the right atrium in a 63-year-old female during coronary bypass surgery. Using two nitinol Goose Neck snares via a transfemoral and a transjugular approach the catheter was severed into two pieces and retrieved percutaneously.

  11. Hereditary premature closure of a coronal suture in the Abraham Lincoln family.

    PubMed

    Fishman, Ronald S

    2013-10-01

    The most easily recognized facial features of unilateral premature closure of a coronal suture in the skull are an upward arching of the superior orbital rim and a smaller face on the involved side. Photographs indicate that at least 9 individuals over 5 generations of the Abraham Lincoln family showed this anomaly. PMID:23856133

  12. Postpneumonectomy bronchopleural fistula after sutured bronchial closure: Incidence, risk factors, and management

    Microsoft Academic Search

    Cameron D. Wright; John C. Wain; Douglas J. Mathisen; Hermes C. Grillo

    1996-01-01

    Objective: Postpneumonectomy bronchopleural fistula remains a morbid complication after pneumonectomy. The incidence, risk factors, and management of postpneumonectomy bronchopleural fistula were evaluated in 256 consecutive patients who underwent pneumonectomy with a standardized suture closure of the bronchus.Methods: Pneumonectomy was performed for lung cancer in 198 cases, for other malignancy in 20 cases, and for benign causes in 38 cases. The

  13. Stratigraphic succession and UPb geochronology from the Teslin suture zone, south-central Yukon

    Microsoft Academic Search

    Douglas H. Oliver; James K. Mortensen

    A lithologic succession is recognized in tectonites of the eastern Teslin suture zone in south-central Yukon. Metagraywacke and quartzite, marble, mafic metavolcanics, and interbedded metagraywacke and argillite outcrop on both limbs of an upright northwest-trending syncline at Little Salmon Lake. A body of equigranular granodiorite intrudes the basal stratigraphic units. The granodiorite and its host sediments were penetratively deformed during

  14. Relationship of Premaxillary Bone and Its Sutures to Deciduous Dentition in Nonhuman Primates

    E-print Network

    Dumont, Elizabeth R.

    Relationship of Premaxillary Bone and Its Sutures to Deciduous Dentition in Nonhuman Primates K). This study surveyed the relationship of the PS to the upper deciduous dentition in nonhuman primates dentition relative to the PS was assessed. In sections of selected specimens, observations of bone cells

  15. Transoral, flexible endoscopic suturing for treatment of GERD: A multicenter trial

    Microsoft Academic Search

    Charles J. Filipi; Glen A. Lehman; Richard I. Rothstein; Isaac Raijman; Gregory V. Stiegmann; J. Patrick Waring; John G. Hunter; Christopher J. Gostout; Steven A. Edmundowicz; Donal P. Dunne; Patrice A. Watson; Douglas A. Cornet

    2001-01-01

    Background: A totally transoral outpatient procedure for the treatment of GERD would be appealing. Methods: A multicenter trial was initiated that included 64 patients with GERD treated with an endoscopic suturing device. Inclusion criteria were 3 or more heartburn episodes per week while not taking medication, dependency on antisecretory medicine, and documented acid reflux by pH monitoring. Exclusion criteria were

  16. Arachnoid Membrane Suturing for Prevention of Subdural Fluid Collection in Extracranial-intracranial Bypass Surgery

    PubMed Central

    Kim, Gun Woo; Kim, Tae Sun; Moon, Hyung Sik; Jang, Jae Won; Seo, Bo Ra; Lee, Jung Kil; Kim, Jae Hyoo; Kim, Soo Han

    2014-01-01

    Objective Water-tight closure of the dura in extracranial-intracranial (EC-IC) bypass is impossible because the superficial temporal artery (STA) must run through the dural defect. Consequently, subdural hygroma and subcutaneous cerebrospinal fluid (CSF) collection frequently occur postoperatively. To reduce these complications, we prospectively performed suturing of the arachnoid membrane after STA-middle cerebral artery (STA-MCA) and evaluated the clinical usefulness. Materials and Methods Between Mar. 2005 and Oct. 2010, extracranial-intracranial arterial bypass (EIAB) with/without encephalo-myo-synangiosis was performed in 88 cases (male : female = 53 : 35). As a control group, 51 patients (57 sides) underwent conventional bypass surgery without closure of the arachnoid membrane. Postoperative computed tomography (CT) scan was performed twice in three days and seven days later, respectively, for evaluation of the presence of subdural fluid collection and other mass lesions. Results The surgical result was excellent, with no newly developing ischemic event until recent follow-up. The additional time needed for arachnoid suture was five to ten minutes, when three to eight sutures were required. Post-operative subdural fluid collection was not seen on follow-up computed tomography scans in all patients. Conclusion Arachnoid suturing is simple, safe, and effective for prevention of subdural fluid collection in EC-IC bypass surgery, especially the vulnerable ischemic hemisphere. PMID:25045645

  17. The retention of vaginal prolapse in the cow using a purse-string suture.

    PubMed

    Rautenbach, G H

    1984-12-01

    Seventeen cows with prolapsed vaginas were treated by placing a purse-string suture cranial to the external urethral opening to retain the vagina. It was found to be a simple procedure with a high rate of success. Fifteen of the patients responded well to the procedure with a minimum of straining being evident in the post operative period. PMID:6398366

  18. Effects of suture material on incision healing, growth and survival of juvenile largemouth bass implanted with

    E-print Network

    Effects of suture material on incision healing, growth and survival of juvenile largemouth bass.S.A. (Received 11 November 2002, Accepted 11 April 2003) Juvenile largemouth bass Micropterus salmoides increased. This study suggests that microtransmitters can be successfully implanted in juvenile largemouth

  19. Damage tolerant light absorbing material

    DOEpatents

    Lauf, R.J.; Hamby, C. Jr.; Akerman, M.A.; Seals, R.D.

    1993-09-07

    A light absorbing article comprised of a composite of carbon-bonded carbon fibers, is prepared by: blending carbon fibers with a carbonizable organic powder to form a mixture; dispersing the mixture into an aqueous slurry; vacuum molding the aqueous slurry to form a green article; drying and curing the green article to form a cured article; and, carbonizing the cured article at a temperature of at least about 1000 C to form a carbon-bonded carbon fiber light absorbing composite article having a bulk density less than 1 g/cm[sup 3]. 9 figures.

  20. Waveform-dependent absorbing metasurfaces.

    PubMed

    Wakatsuchi, Hiroki; Kim, Sanghoon; Rushton, Jeremiah J; Sievenpiper, Daniel F

    2013-12-13

    We present the first use of a waveform-dependent absorbing metasurface for high-power pulsed surface currents. The new type of nonlinear metasurface, composed of circuit elements including diodes, is capable of storing high-power pulse energy to dissipate it between pulses, while allowing propagation of small signals. Interestingly, the absorbing performance varies for high-power pulses but not for high-power continuous waves (CW's), since the capacitors used are fully charged up. Thus, the waveform dependence enables us to distinguish various signal types (i.e., CW or pulse) even at the same frequency, which potentially creates new kinds of microwave technologies and applications. PMID:24483674

  1. Waveform-dependent absorbing metasurfaces

    E-print Network

    Wakatsuchi, Hiroki; Rushton, Jeremiah J; Sievenpiper, Daniel F

    2014-01-01

    We present the first use of a waveform-dependent absorbing metasurface for high-power pulsed surface currents. The new type of nonlinear metasurface, composed of circuit elements including diodes, is capable of storing high power pulse energy to dissipate it between pulses, while allowing propagation of small signals. Interestingly, the absorbing performance varies for high power pulses but not for high power continuous waves (CWs), since the capacitors used are fully charged up. Thus, the waveform dependence enables us to distinguish various signal types (i.e. CW or pulse) even at the same frequency, which potentially creates new kinds of microwave technologies and applications.

  2. Damage tolerant light absorbing material

    DOEpatents

    Lauf, Robert J. (Oak Ridge, TN); Hamby, Jr., Clyde (Harriman, TN); Akerman, M. Alfred (Knoxville, TN); Seals, Roland D. (Oak Ridge, TN)

    1993-01-01

    A light absorbing article comprised of a composite of carbon-bonded carbon fibers, prepared by: blending carbon fibers with a carbonizable organic powder to form a mixture; dispersing the mixture into an aqueous slurry; vacuum molding the aqueous slurry to form a green article; drying and curing the green article to form a cured article; and, carbonizing the cured article at a temperature of at least about 1000.degree. C. to form a carbon-bonded carbon fiber light absorbing composite article having a bulk density less than 1 g/cm.sup.3.

  3. Inhibition of secondary cartilage of the intermaxillary suture in Sprague-Dawley rats following the enucleation of maxillary molars

    SciTech Connect

    Forbes, D.P.; Al-Bareedi, S.

    1986-01-01

    A single craniofacial suture can undergo several morphologic transformations during its development. From 3 to 7 weeks of age, the intermaxillary suture of the rat is synchondrotic in character, featuring secondary cartilage; at later times, this suture is syndesmotic in character, featuring a fibrous tissue interface. Since intermittent mechanical stimulation has been reported to initiate secondary cartilage formation, a study was done to determine if the functioning dentition were responsible for secondary cartilage formation in the intermaxillary suture of the rat. Twenty-two female Sprague-Dawley rats were used. At 3 weeks of age, prior to eruption, the maxillary molars were enucleated from nine animals. Body weights were recorded weekly. Animals were sacrificed weekly from 4 to 7 weeks of age. One hour prior to sacrifice, each rat was injected with (/sup 35/S)sulfate at a dosage of 2 microCi/g body weight. The tissues were evaluated by light microscopy and autoradiography. In the experimental group, the midpalatal suture did not undergo the normal synchondrotic transformation. Instead, this suture remained fibrous with negligible metachromatic staining. In the control animals, the peak period of (/sup 35/S)sulfate incorporation was 4 weeks of age and was five times greater than in the experimental group. The primary stimulus for the initiation of secondary cartilage formation in the midpalatal suture of the rat was molar function. Also, functioning molars were found to be important in the maintenance of the palatal bone.

  4. Evaluation of Shock Absorber Models

    Microsoft Academic Search

    STEFAAN DUYM; RANDY STIENS; KOENRAAD REYBROUCK

    1997-01-01

    A non exhaustive overview of shock absorber models is presented. The ability of the models to match experimental data is emphasized. Two physical models are presented that are able to extract the internal valve parameters from data without hysteresis. In order to implement a model that copes with hysteresis, most models require the numerical solution to a set of nonlinear

  5. Radar Absorbing Applications of Metamaterials

    Microsoft Academic Search

    Vasundara V. Varadan

    2007-01-01

    Radar absorbing materials (RAM) is used to camouflage or shield highly reflective surfaces such metallic surfaces from incident electromagnetic (EM) waves. In this paper, we explore the applications of metamaterials as conformal RAM coatings for controlling the reflection of EM waves from metal surfaces. Metamaterials are engineered materials with specially designed metallic resonant structures that are much smaller than the

  6. Oil and fat absorbing polymers

    NASA Technical Reports Server (NTRS)

    Marsh, H. E., Jr. (inventor)

    1977-01-01

    A method is described for forming a solid network polymer having a minimal amount of crosslinking for use in absorbing fats and oils. The polymer remains solid at a swelling ratio in oil or fat of at least ten and provides an oil absorption greater than 900 weight percent.

  7. Selective absorbing surfaces in practice

    Microsoft Academic Search

    J. J. Mason

    1983-01-01

    Selective absorbing surface treatments have become commercially viable processes for the cost-effective conversion of solar energy to thermal energy. Properties of coatings and methods of measuring the parameters are described. In this paper selective surface production technology, including electrodeposition, chemical conversion and physical vapor deposition, is reviewed. Specific examples of the development of the principal surfaces, nickel black, black chrome,

  8. The potential of photoacoustic microscopy as a tool to characterize the in vivo degradation of surgical sutures

    PubMed Central

    Aguirre, Juan; Morales-Dalmau, Jordi; Funk, Lutz; Jara, Francesc; Turon, Pau; Durduran, Turgut

    2014-01-01

    The ex vivo and in vivo imaging, and quantitative characterization of the degradation of surgical sutures (?500 ?m diameter) up to ?1cm depth is demonstrated using a custom dark-field photo-acoustic microscope (PAM). A practical algorithm is developed to accurately measure the suture diameter during the degradation process. The results from tissue simulating phantoms and mice are compared to ex vivo measurements with an optical microscope demonstrating that PAM has a great deal of potential to characterize the degradation process of surgical sutures. The implications of this work for industrial applications are discussed. PMID:25136508

  9. Statistical analysis of biomechanical properties of the adult sagittal suture using a bending method in a Japanese forensic sample.

    PubMed

    Torimitsu, Suguru; Nishida, Yoshifumi; Takano, Tachio; Koizumi, Yoshinori; Hayakawa, Mutsumi; Yajima, Daisuke; Inokuchi, Go; Makino, Yohsuke; Motomura, Ayumi; Chiba, Fumiko; Iwase, Hirotaro

    2015-04-01

    This study examined the mechanical properties of the adult sagittal suture compared with surrounding parietal bones using bending tests and investigated the association between the mechanical properties of the suture and age. We used the heads of 116 Japanese cadavers (76 male cadavers and 40 female cadavers) of known age and sex. A total of 1160 cranial samples, 10 from each skull, were collected. The samples were imaged using multidetector computed tomography, and the sample thickness at the center of each sample (ST) was measured. The failure stress of each sample (FS) was measured by a bending test, and the ratio of failure stress to the square of sample thickness (FS/ST(2)) was calculated. Statistical analyses revealed that the FS and FS/ST(2) values were significantly lower at all suture sites than at all bone sites regardless of sex. There were not significant but slight positive correlations between age and FS and FS/ST(2) values at any suture site in male samples. In female samples, age had significant positive correlations with FS and FS/ST(2) values at the middle suture sites, whereas there were not significant but slight positive correlations between age and FS and FS/ST(2) values at the edges of the suture. Statistical analyses also demonstrated that FS and FS/ST(2) values were significantly greater in male samples than in female samples at the middle suture sites. These findings suggest that the bending strength of the adult sagittal suture is significantly lower than that of surrounding parietal bones. Therefore, avoiding direct impact on cranial sutures may be important for preventing skull fractures and severe complications that can cause death. The results of this study also revealed that the bending strength of the middle sagittal suture significantly increases with age in only female samples, whereas the bending strength is significantly higher in male samples than in female samples at the middle suture sites, indicating the possibility of sex difference in the bony interdigitation of the sutures during childhood. PMID:25679987

  10. Magnetotelluric survey to locate the Archean/Proterozoic suture zone north of Wells, Nevada

    USGS Publications Warehouse

    Williams, Jackie M.; Rodriguez, Brian D.

    2006-01-01

    It is important to know whether major mining districts in the Northern Nevada Gold Province are underlain by rocks of the Archean Wyoming craton, which are known to contain orogenic gold deposits, or by accreted rocks of the Paleoproterozoic Mojave province. It is also important to know the location and orientation of the Archean/Proterozoic suture zone between these provinces as well as major basement structures within these terranes because they may influence subsequent patterns of sedimentation, deformation, magmatism, and hydrothermal activity. The Archean was the main gold-mineralization period, and Archean lode-gold deposits were formed at mid-crustal depths along major shear zones. The nature of the crystalline basement below the Northern Nevada Gold Province and the location of major faults within it are relevant to Rodinian reconstructions, crustal development, and ore deposit models (e.g., Hofstra and Cline, 2000; Grauch and others, 2003). According to Whitmeyer and Karlstrom (2004), the Archean cratons of the northwestern United States and Canada had stabilized as continental lithosphere by 2.5 Ga, and were rifted and assembled into a large continental mass by 1.8 Ga, to which the 1.73-1.68 Ga Mohave province was accreted by 1.65 Ga. The Archean/Proterozoic suture zone has a west-southwest strike where it is exposed (Reed, 1993) at the eastern Utah and southwestern Wyoming border (Cheyenne Belt) where it is characterized by an up to 7-km-thick mylonite zone (Smithson and Boyd, 1998). In the Great Basin, the strike of the Archean/Proterozoic suture zone is poorly constrained because it is largely concealed below a Neoproterozoic-Paleozoic miogeocline and basin fill. East-west and southwest-northeast strikes for the Archean/Proterozoic suture zone have been inferred based on Sr, Nd, and Pb isotopic compositions of granitoid intrusions (Tosdal and others, 2000). To better constrain the location and strike of the Archean/Proterozoic suture zone below cover, three regional north-south magnetotelluric (MT) sounding profiles were acquired in western Utah and northeastern Nevada (Williams and Rodriguez, 2003; 2004; 2005), and one east-west MT sounding profile (fig. 1) MT sounding profile was acquired in northeastern Nevada. Resistivity modeling of the MT data can be used to investigate buried structures or sutures that may have influenced subsequent regional fluid flow and localized mineralization. The purpose of this report is to release the MT sounding data collected along the east-west profile in northeastern Nevada; no interpretation of the data is included.

  11. Efficient Desalination with Fractal Absorbers

    NASA Astrophysics Data System (ADS)

    Singleton, Martin; Heiss, Gregor; Hubler, Alfred

    2008-03-01

    A class of Ramified graphs (RG) is introduced as Iterated Function Systems (IFS) to optimally design networks for efficient reverse osmosis desalination in deep seawater. Different forms of the IFS are presented, along with a corresponding contractivity factor sc, in order to identify the attractors of the systems and their fractal dimension. Using the analogy to electrostatics, the diffusion equation is solved for the desalination systems under three different boundary conditions, i) all nodes having the same pressure difference across the absorbers, ii) all nodes producing permeate at identical rates, and iii) each node having the same salt node strength. Optimal branching angles and branch length ratios are found by phase-space and discrete simulated annealing search techniques for each boundary condition, which either maximize production of permeate or minimize expenditure of energy for different fixed numbers of absorbers. Dependence of desalination recovery ratios on the geometry and fractal dimension of the RG is also explored.

  12. Absorbable biologically based internal fixation.

    PubMed

    Ibrahim, Ahmed M S; Koolen, Pieter G L; Kim, Kuylhee; Perrone, Gabe S; Kaplan, David L; Lin, Samuel J

    2015-01-01

    Absorbable devices for use in internal fixation have advanced over the years to become reliable and cost-effective alternatives to metallic hardware. In the past, biodegradable fixation involved a laborious implantation process, and induced osteolysis and inflammatory reactions. Modern iterations exhibit increased strength, smoother resorption, and lower rates of reactivity. A newer generation manufactured from silk has emerged that may address existing limitations and provide a greater range of fixation applications. PMID:25440418

  13. PT-symmetric laser absorber

    NASA Astrophysics Data System (ADS)

    Longhi, Stefano

    2010-09-01

    In a recent work, Y. D. Chong [Phys. Rev. Lett.0031-900710.1103/PhysRevLett.105.053901 105, 053901 (2010)] proposed the idea of a coherent perfect absorber (CPA) as the time-reversed counterpart of a laser, in which a purely incoming radiation pattern is completely absorbed by a lossy medium. The optical medium that realizes CPA is obtained by reversing the gain with absorption, and thus it generally differs from the lasing medium. Here it is shown that a laser with an optical medium that satisfies the parity-time (PT) symmetry condition ?(-r)=?*(r) for the dielectric constant behaves simultaneously as a laser oscillator (i.e., it can emit outgoing coherent waves) and as a CPA (i.e., it can fully absorb incoming coherent waves with appropriate amplitudes and phases). Such a device can thus be referred to as a PT-symmetric CPA laser. The general amplification or absorption features of the PT CPA laser below lasing threshold driven by two fields are determined.

  14. Energy-Absorbing, Lightweight Wheels

    NASA Technical Reports Server (NTRS)

    Waydo, Peter

    2003-01-01

    Improved energy-absorbing wheels are under development for use on special-purpose vehicles that must traverse rough terrain under conditions (e.g., extreme cold) in which rubber pneumatic tires would fail. The designs of these wheels differ from those of prior non-pneumatic energy-absorbing wheels in ways that result in lighter weights and more effective reduction of stresses generated by ground/wheel contact forces. These wheels could be made of metals and/or composite materials to withstand the expected extreme operating conditions. As shown in the figure, a wheel according to this concept would include an isogrid tire connected to a hub via spring rods. The isogrid tire would be a stiff, lightweight structure typically made of aluminum. The isogrid aspect of the structure would both impart stiffness and act as a traction surface. The hub would be a thin-walled body of revolution having a simple or compound conical or other shape chosen for structural efficiency. The spring rods would absorb energy and partially isolate the hub and the supported vehicle from impact loads. The general spring-rod configuration shown in the figure was chosen because it would distribute contact and impact loads nearly evenly around the periphery of the hub, thereby helping to protect the hub against damage that would otherwise be caused by large loads concentrated onto small portions of the hub.

  15. Mattress sutures to remove unwanted convexity and concavity of the nasal tip: 12-year follow-up.

    PubMed

    Gruber, Ronald P; Peled, Anne; Talley, John

    2015-01-01

    Nasal tip bulbosity, or convexity, has been one of the most difficult problems to correct during rhinoplasty. Excision of cartilage from the cephalic part of the lateral crus has helped. However, complete correction of the deformity is not always possible with this maneuver alone. Suture techniques have also helped to improve outcomes. Twelve years ago, the lateral crus mattress suture was introduced as a way of converting the lateral crus to a flat, straight segment with resultant correction of the convexity. Since then, this suture technique has been employed in most primary and some secondary rhinoplasties and has stood the test of time. We report our experience with this technique, including a slight modification to facilitate its application when the cartilage is unusually narrow or when the original technique is difficult to complete. In addition, the suture technique for the less concave lateral crura is redescribed. It, too, has withstood the test of time. PMID:25568231

  16. Stapled aortic anastomoses: a minimally invasive, feasible alternative to videoscopic aortic suturing?

    PubMed

    Elkouri, Stephane; Noel, Audra A; Gloviczki, Peter; Karnicki, Krzysztof; Douglas, Christopher J; Phelps, Raymond R; Bernard, Geraldine K; Prieto, Mikel; Deschamps, Claude; Rowland, Charles

    2004-01-01

    Widespread applications of totally laparoscopic aortic reconstructions have been limited by the long cross-clamp time required to suture the aortic anastomosis despite improvement in instrumentation. The authors' hypothesis was that a "one-step anastomosis concept" using an intraluminal stapler would allow shorter cross-clamp time but similar patency and imperviousness as videoscopic suturing techniques. An intraluminal stapler (Endopath-ILS, Ethicon) with a modified anvil was used to perform videoscopic-assisted thoracic aorta-to-iliac artery bypass with a 21 mm by 8 mm polytetrafluoroethylene (PTFE) graft in 22 sheep through a minimally invasive approach using a 5 cm thoracotomy. The graft-to-iliac artery anastomoses were hand sutured through a flank incision. Twelve sheep were used to establish the technique and 10 subsequent animals constituted the study group. Aortic cross-clamp time, imperviousness, and need for additional sutures were recorded and compared to previously reported data using videoscopic suturing in pigs. Patency was assessed by comparing lower limb arterial pressures. Macroscopic and microscopic examinations of the anastomoses were performed at different time-points within the first 3 months. Videoscopic-assisted stapled anastomoses were also performed on atherosclerotic aortas of 3 human cadavers. Stapled anastomoses between the thoracic aorta and PTFE graft were completed in 8 of 10 animals. Two animals were euthanized after stapler failure and anastomotic bleeding. Sutures to strengthen the anastomosis had to be used in 4 cases. Mean aortic cross-clamp time in 8 successful cases was 4.3 +/-2.9 minutes (range 2-11 minutes) and was significantly shorter than clamp time of videoscopic suturing technique (48.7 +/-9.4 minutes, p < 0.0001). Imperviousness was good or excellent in 4 animals and fair in 4 animals. All anastomoses were patent at the end of the procedure. Examination of the anastomosis of the 2 failed interventions showed medial aortic tear surrounding the anastomosis in 1 case and misfired staples in the other. No graft occlusion was noted during follow-up ranging from 0 to 12 weeks. At the time of harvest, no bleeding was noted after epinephrine and volume infusion to increase mean arterial pressure to 200 mm Hg for 15 minutes. Macroscopic examination of the anastomoses revealed adequate healing with circumferential stapling of the prosthesis to the aortic wall and no stenosis or thrombus except in 1 false aneurysm (1/7, 14%). Surface electron microscopy showed cells coverage of the anastomosis surface. When applied on human cadaver thoracic and abdominal aorta with atherosclerotic changes, clamping times of less than 5 minutes were achieved. However, imperviousness tested with saline was poor. An automatic stapling device allows performance of a graft-to-aorta anastomosis through a minimally invasive approach with shorter clamping time than a videoscopic suturing technique. However, the current technique of aortic stapling is unreliable and further improvements are needed. PMID:15306949

  17. Suturing property of tough double network hydrogels for bio-repair materials

    NASA Astrophysics Data System (ADS)

    Na, Yang Ho; Oh, Hwa Yeon; Ahn, Young Ju; Han, Youngbae

    2015-02-01

    Cartilage and meniscal lesions have limited potential for spontaneous repair. Consequently, much effort has been made to develop methods for repairing such lesions. Double-network (DN) gels are new candidate-materials for repairing such lesions. They exhibit exceptional mechanical strength and toughness in spite of their high water content. In this study, we prepared highly tough DN hydrogels and investigated the mechanical properties related to clinical implant use. The mechanical properties such as Young's modulus and suture tear-out strength were measured for the artificial replacement. The results suggest that the suture property of DN hydrogels can be adjusted by controlling the crosslinking density and monomer concentration. Finite element method was also applied to these DN hydrogels in order to check whether the fracture strength of the material is enough to meet a medical purpose.

  18. Blends of thermoplastic polyurethane and polydimethylsiloxane rubber: assessment of biocompatibility and suture holding strength of membranes.

    PubMed

    Rajan, Krishna Prasad; Al-Ghamdi, Ahmed; Parameswar, Ramesh; Nando, G B

    2013-01-01

    In the present investigation, a compatibilized blend of thermoplastic polyurethane (TPU) and polydimethylsiloxane (PDMS) is prepared by using copolymer of ethylene and methyl acrylate (EMA) as a reactive compatibilizer. Detailed in vitro biocompatibility studies were carried out for this compatibilized blend and the material was found noncytotoxic towards L929 mouse fibroblast subcutaneous connective tissue cell line. Microporosity was created on the surface of membranes prepared from the blend material by adopting the crazing mechanism. Cell proliferation and growth studies on the membranes surface showed that the microporous surface favoured ingrowth of the cells compared with a nonmicroporous surface. Suture holding strength studies indicate that the microporous membranes have enough strength to withstand the cutting and tearing forces through the suture hole. This blend material could be evaluated further to find its suitability in various implant applications. PMID:24454376

  19. Staples vs subcuticular sutures for skin closure at cesarean delivery: a metaanalysis of randomized controlled trials.

    PubMed

    Clay, Felix S H; Walsh, Colin A; Walsh, Stewart R

    2011-05-01

    Recently published randomized trials examining skin closure technique on postcesarean wound complications have produced conflicting results. We performed a metaanalysis of trials comparing staples and subcuticular sutures for skin closure at cesarean section (CS). Pooled outcome measures were calculated using random effects models. Primary outcomes were rates of wound dehiscence (separation) and a composite wound complication rate. Secondary outcomes were patient satisfaction, operating time, and postoperative pain. A total of 877 women from 5 trials were included. Both wound separation (pooled odds ratio, 4.01; P < .0001) and composite wound complication (pooled odds ratio, 2.11; P = .003) rates were higher with staples. The use of staples reduced operating time (weighted mean difference, -5.05 minutes; P = .021). Data on postoperative pain and patient satisfaction were insufficient for metaanalysis. Our findings suggest a possible benefit with subcuticular sutures compared to skin staples for skin closure at CS. However, the optimal skin closure technique at CS demands further study. PMID:21195384

  20. Conchopexy suture to prevent middle turbinate lateralisation and septal haematoma after endoscopic sinus surgery.

    PubMed

    Bhalla, R K; Kaushik, V; de Carpentier, J

    2005-06-01

    Endoscopic ethmoidectomy is now one of the commonest surgical procedures performed by ear, nose and throat surgeons. Access to the ethmoid air cells is via the middle meatus following medialisation of the middle turbinate and uncinectomy. The most satisfactory postoperative results are achieved by maintaining patency of the middle meatus. This allows delivery of topical medication and sinus aeration. Spontaneous lateralisation of the middle turbinate during the healing period, with or without synechiae, can compromise the surgical benefit. This paper describes a conchopexy suture placed at completion of ethmoidectomy. A carefully placed yet simple suture technique will maintain a widely patent middle meatus during the phase of post-operative healing. A slight modification allows quilting of mucoperichondrial flaps after septal surgery. PMID:16008072

  1. Blends of Thermoplastic Polyurethane and Polydimethylsiloxane Rubber: Assessment of Biocompatibility and Suture Holding Strength of Membranes

    PubMed Central

    Al-Ghamdi, Ahmed; Parameswar, Ramesh; Nando, G. B.

    2013-01-01

    In the present investigation, a compatibilized blend of thermoplastic polyurethane (TPU) and polydimethylsiloxane (PDMS) is prepared by using copolymer of ethylene and methyl acrylate (EMA) as a reactive compatibilizer. Detailed in vitro biocompatibility studies were carried out for this compatibilized blend and the material was found noncytotoxic towards L929 mouse fibroblast subcutaneous connective tissue cell line. Microporosity was created on the surface of membranes prepared from the blend material by adopting the crazing mechanism. Cell proliferation and growth studies on the membranes surface showed that the microporous surface favoured ingrowth of the cells compared with a nonmicroporous surface. Suture holding strength studies indicate that the microporous membranes have enough strength to withstand the cutting and tearing forces through the suture hole. This blend material could be evaluated further to find its suitability in various implant applications. PMID:24454376

  2. Is the central Piedmont suture a low-angle normal fault

    SciTech Connect

    Dennis, A.J. (Univ. of South Carolina, Aiken (United States))

    1991-11-01

    In the crystalline southern Appalachians, the Carolina arc terrane is in fault contact with the Piedmont terrace along a seismically reflective surface dipping toward the hinterland and called the central Piedmont suture. The central Piedmont suture may be interpreted as a thrust, but existing data also support a Silurian-Devonian, normal-slip origin: (1) There are lower grade rocks in the hanging wall than in the footwall. (2) A normal-fault solution allows simultaneous metamorphism of the Piedmont terrane and Carolina terrane, prior to their juxtaposition along the central Piedmont suture. (3) Mineral ages in the Piedmont terrane are older in the west than in the east, consistent with an eastward-progressive unroofing. (4) Along the western edge of the Carolina terrane, a linear belt of Devonian subalkalic to alkalic granitoids and gabbro-norites with low initial {sup 87}Sr/{sup 86}Sr ratios may represent mantle-derived magmas along the axis of rifting that are contemporary with major crustal extension. The westernmost Piedmont terrane includes the Chauga belt. The Chauga belt comprises metavolcanic and metaplutonic units similar in rock type and age to those of the western Carolina terrane. Chauga belt rocks are interpreted to be the westernmost exposures of the Carolina terrane, translated west on the lower plate by extension. The Piedmont and Carolina terranes may thus compose a single lithotectonic element. The Piedmont terrane would represent the basement on which the arc was constructed; the terrane was uplifted during extension along a major low-angle normal fault, recognized today as the central Piedmont suture.

  3. Zero ischaemia laparoscopic nephron-sparing surgery by re-suturing

    PubMed Central

    Lu, Jinshan; Zu, Qiang; Du, Qingshan; Xu, Yong; Zhang, Xu

    2014-01-01

    Aim of the study To report a pre-suture technique in laparoscopic nephron-sparing surgery (LNSS), which could help reduce and even avoid ischaemia for the treatment of renal cell carcinoma. Material and methods Between January and June 2013 we treated 14 patients presenting with renal tumours. The mean age was 46 years and average tumour size was 2.4 cm in diameter determined by computed tomography (CT). All the patients were treated with LNSS by pre-suturing the resection. Results In 13 out of the 14 cases, no clamping was needed during the whole surgery processes, i.e. zero ischaemia was achieved. In the other case, the renal artery was clamped for only 150 seconds due to suture avulsion. The mean operating time was 75 minutes (range 50 to 110 minutes) and mean blood loss was 60 ml (range 30 to 200 ml). After removal of the drain 2–3 days after surgery, the average postoperative hospital stay time was four days. The surgery had only a minor effect on the renal function. No case of urinary leakage or postoperative bleeding occurred. Postoperative pathological reports showed that the tumours were resected completely with negative surgical margins for all cases. There were no signs of recurrence on follow-up CT performed 1–6 months after surgery. Conclusions The pre-suture technique in LNSS reported here required zero or minimal ischaemia time and hence avoided renal ischaemia-reperfusion injury. This surgical technique could be a feasible surgical option for treatment of small, exophytic and peripheral renal tutors. PMID:25477760

  4. Stability of one-stage adjustable suture for the correction of horizontal strabismus

    Microsoft Academic Search

    P C Chow

    1989-01-01

    One-stage adjustable suture for strabismus correction, with the whole operation done under topical anaesthesia and adjustment done on the table, was performed on 45 consecutive patients. The stability of the post-adjustment result was studied by comparing the post-adjustment deviation on the operating table to that at six weeks and three months after operation. The stability was comparable to that following

  5. Triclosan-coated sutures do not reduce leg wound infections after coronary artery bypass grafting

    PubMed Central

    Seim, Bjørn Edvard; Tønnessen, Theis; Woldbaek, Per Reidar

    2012-01-01

    OBJECTIVES Leg wound infection is a common complication after coronary artery bypass grafting (CABG). Suture contamination has been suggested as a mechanism of surgical site infections. Vicryl Plus® is a polyglacitin suture coated with the antiseptic chemical substance Triclosan, which has been shown to inhibit the growth of Staphylococcus aureus in vitro. The first aim of the present study was to compare Vicryl Plus with conventional Vicryl® sutures with regard to leg wound infections following CABG. The second aim was to examine patient- and operative characteristics, which are assumed to predict leg wound infections. METHODS After statistical calculations a priori, 328 CABG patients were prospectively randomized to leg wound closure with Vicryl Plus (164 patients) or conventional Vicryl sutures (164 patients). Incidences of leg wound infection and predictors of infection related to patient- and operative characteristics were examined. RESULTS The incidence of leg wound infections was 10.4% (17/163) in the Vicryl group, and 10.0% (16/160) in the Vicryl Plus group (P = 1.00). Patients with leg wound infections had increased body mass index and prolonged extracorporeal circulation and aortic clamping time compared with patients without infections. CONCLUSIONS In the present study, we report for the first time that Vicryl Plus did not reduce the incidence of leg wound infections in patients undergoing CABG. Obesity and prolonged time of extracorporeal circulation were both associated with the increased risk of infections. Currently, the clinical role and indication for the use of Vicryl Plus have yet to be defined. PMID:22691378

  6. Early Motion After Quadriceps and Patellar Tendon RepairsOutcomes With Single-Suture Augmentation

    Microsoft Academic Search

    Jesse L. West; James S. Keene; Lee D. Kaplan

    2008-01-01

    Background: Complications of immobilization after quadriceps and patellar tendon repairs include decreased patellar mobility, limited flexion, persistent pain, muscle weakness, and patella baja. In contrast, early motion limits muscle atrophy, accelerates tendon healing, and prevents joint stiffness.Hypothesis: Quadriceps and patellar tendon repairs protected with a “relaxing suture” are strong enough to safely permit early motion, full weightbearing, and brace-free ambulation.Study

  7. Continuous suture of the pancreatic stump and Braun enteroenterostomy in pancreaticoduodenectomy

    PubMed Central

    Meng, Hong-Bo; Zhou, Bo; Wu, Fan; Xu, Jie; Song, Zhen-Shun; Gong, Jian; Khondaker, Mahbuba; Xu, Bin

    2015-01-01

    AIM: To investigate a new modification of pancreaticoduodenectomy (PD)-a mesh-like running suturing of the pancreatic remnant and Braun’s enteroenterostomy. METHODS: Two hundred and three patients underwent PD from 2009 to 2014 and were classified into two groups: Group A (98 patients), who received PD with a mesh-like running suturing for the pancreatic remnant, and Braun’s enteroenterostomy; and Group B (105 patients), who received standard PD. Demographic data, intraoperative findings, postoperative morbidity and perioperative mortality between the two groups were compared by univariate and multivariate analysis. RESULTS: Demographic characteristics between Group A and Group B were comparable. There were no significant differences between the two groups concerning perioperative mortality, and operative blood loss, as well as the incidence of the postoperative morbidity, including reoperation, bile leakage, intra-abdominal fluid collection or infection, and postoperative bleeding. Clinically relevant postoperative pancreatic fistula (POPF) and delayed gastric emptying (DGE) were identified more frequently in Group B than in Group A. Technique A (PD with a mesh-like running suturing of the pancreatic remnant and Braun’s enteroenterostomy) was independently associated with decreased clinically relevant POPF and DGE, with an odds ratio of 0.266 (95%CI: 0.109-0.654, P = 0.004) for clinically relevant POPF and 0.073 (95%CI: 0.010-0.578, P = 0.013) for clinically relevant DGE. CONCLUSION: An additional mesh-like running suturing of the pancreatic remnant and Braun’s enteroenterostomy during PD decreases the incidence of postoperative complications and is beneficial for patients. PMID:25759543

  8. Healing high-risk sternotomy incisions: interrupted suture closure and negative pressure wound therapy.

    PubMed

    Said, Sameh M; Daly, Richard C

    2015-04-01

    High-risk sternotomy incisions represent a challenge at the time of wound closure. We present an alternate wound closure technique that can be used in high-risk sternotomy incisions and consists of a combination of space-obliterating sutures and negative pressure (suction using wound VAC) therapy. doi: 10.1111/jocs.12388 (J Card Surg 2015;30:346-350). PMID:24943468

  9. Arthroscopic Single-Row Versus Double-Row Suture Anchor Rotator Cuff Repair

    Microsoft Academic Search

    Augustus D. Mazzocca; Peter J. Millett; Carlos A. Guanche; Stephen A. Santangelo; Robert A. Arciero

    2005-01-01

    Background: Recurrent defects after open and arthroscopic rotator cuff repair are common. Double-row repair techniques may improve initial fixation and quality of rotator cuff repair.Purpose: To evaluate the load to failure, cyclic displacement, and anatomical footprint of 4 arthroscopic rotator cuff repair techniques.Hypothesis: Double-row suture anchor repair would have superior structural properties and would create a larger footprint compared to

  10. Development of a Surgically Optimized Graft Insertion Suture Technique to Accommodate a Tissue-Engineered Tendon In Vivo

    PubMed Central

    Sawadkar, Prasad; Alexander, Susan; Tolk, Marten; Wong, Jason; McGrouther, Duncan; Bozec, Laurent

    2013-01-01

    Abstract The traumatic rupture of tendons is a common clinical problem. Tendon repair is surgically challenging because the tendon often retracts, resulting in a gap between the torn end and its bony insertion. Tendon grafts are currently used to fill this deficit but are associated with potential complications relating to donor site morbidity and graft necrosis. We have developed a highly reproducible, rapid process technique to manufacture compressed cell-seeded type I collagen constructs to replace tendon grafts. However, the material properties of the engineered constructs are currently unsuitable to withstand complete load bearing in vivo. A modified suture technique has been developed to withstand physiological loading and off load the artificial construct while integration occurs. Lapine tendons were used ex vivo to test the strength of different suture techniques with different sizes of Prolene sutures and tissue-engineered collagen constructs in situ. The data were compared to standard modified Kessler suture using a standard tendon graft. Mechanical testing was carried out and a finite element analysis stress distribution model constructed using COMSOL 3.5 software. The break point for modified suture technique with a tissue-engineered scaffold was significantly higher (50.62?N) compared to a standard modified Kessler suture (12.49?N, p<0.05). Distributing suture tension further proximally and distally from the tendon ends increased the mechanical strength of the repairs. We now have ex vivo proof of concept that this suture technique is suitable for testing in vivo, and this will be the next stage of our research. PMID:24083088

  11. Material and knot properties of braided polyester (Ticron ® ) and bioabsorbable poly-L\\/D-lactide (PLDLA) 96\\/4 sutures

    Microsoft Academic Search

    A. Viinikainen; H. Göransson; K. Huovinen; M. Kellomäki; P. Törmälä; P. Rokkanen

    2006-01-01

    The purpose of the present study was to investigate in vitro the biomechanical material and knot properties and histomorphometrical knot properties of 3–0 braided polyester suture (Ticron) and bioabsorbable poly-L\\/D-lactide (PLDLA) 96\\/4 suture. In Ticron five throws are needed to form a secure knot, and the\\u000a 1 = 1 = 1 = 1 = 1 and the 2 = 1

  12. Rheological control on the tectonic evolution of a continental suture zone: the Variscan example from NW Iberia (Spain)

    NASA Astrophysics Data System (ADS)

    Díez Fernández, Rubén; Foster, David A.; Gómez Barreiro, Juan; Alonso-García, Montserrat

    2013-07-01

    The Variscan continental suture zone exposed in NW Iberia is examined to uncover the long-lived rheological control exerted by the strata deposited over the external parts of Gondwana on its geodynamic evolution. The suture occurs within a set of allochthonous terranes whose limits were taken as domain boundaries to interpret the Variscan stacking of Paleozoic continental domains and retrodeform the resulting nappe pile. The suture zone formed due to closure of ocean basins located between Gondwana and Laurussia during the Late Paleozoic and consists of relics of oceanic and transitional crust. The suture zone exhibits a tabular to lens shape due to repeated tectonic events dominated by non-coaxial deformation (thrusts and low-angle normal faults). Thrusting and normal faulting also involved the margins of the continents bounding the suture. The structure of the continental blocks, however, is dominated by folds, particularly large nappe folds with pronounced superimposed flattening. The upper part of the basal allochthonous units comprises a rheologically incompetent domain below the suture zone. This domain is typified by the carbonaceous-rich strata, which are probably Ordovician-Silurian sediments based on U-Pb detrital zircon populations. The rheology of this layer determined the location of the first accretionary thrust that initiated the Late Devonian subduction of the Gondwana margin below the suture zone. By favoring fault development, the upper sequence of the basal allochthonous units as a whole influenced the exhumation of deep-seated continental crust, the transference of the suture zone over Gondwana, and the re-equilibration of the resulting overthickened crust.

  13. Development of a surgically optimized graft insertion suture technique to accommodate a tissue-engineered tendon in vivo.

    PubMed

    Sawadkar, Prasad; Alexander, Susan; Tolk, Marten; Wong, Jason; McGrouther, Duncan; Bozec, Laurent; Mudera, Vivek

    2013-10-01

    The traumatic rupture of tendons is a common clinical problem. Tendon repair is surgically challenging because the tendon often retracts, resulting in a gap between the torn end and its bony insertion. Tendon grafts are currently used to fill this deficit but are associated with potential complications relating to donor site morbidity and graft necrosis. We have developed a highly reproducible, rapid process technique to manufacture compressed cell-seeded type I collagen constructs to replace tendon grafts. However, the material properties of the engineered constructs are currently unsuitable to withstand complete load bearing in vivo. A modified suture technique has been developed to withstand physiological loading and off load the artificial construct while integration occurs. Lapine tendons were used ex vivo to test the strength of different suture techniques with different sizes of Prolene sutures and tissue-engineered collagen constructs in situ. The data were compared to standard modified Kessler suture using a standard tendon graft. Mechanical testing was carried out and a finite element analysis stress distribution model constructed using COMSOL 3.5 software. The break point for modified suture technique with a tissue-engineered scaffold was significantly higher (50.62?N) compared to a standard modified Kessler suture (12.49?N, p<0.05). Distributing suture tension further proximally and distally from the tendon ends increased the mechanical strength of the repairs. We now have ex vivo proof of concept that this suture technique is suitable for testing in vivo, and this will be the next stage of our research. PMID:24083088

  14. Shock absorber operates over wide range

    NASA Technical Reports Server (NTRS)

    Creasy, W. K.; Jones, J. C.

    1965-01-01

    Piston-type hydraulic shock absorber, with a metered damping system, operates over a wide range of kinetic energy loading rates. It is used for absorbing shock and vibration on mounted machinery and heavy earth-moving equipment.

  15. Multiband Metamaterial Absorber at Terahertz Frequencies

    NASA Astrophysics Data System (ADS)

    Xu, Zong-Cheng; Gao, Run-Mei; Ding, Chun-Feng; Zhang, Ya-Ting; Yao, Jian-Quan

    2014-05-01

    We propose a multi-band metamaterial absorber operating at terahertz frequencies. The design, characterization, and theoretical calculation of the high performance metamaterial absorber are reported. The multi-band metamaterial absorber consists of two metallic layers separated by a dielectric spacer. Theoretical and simulated results show that the metamaterial absorber has four distinct absorption points at frequencies 0.57 THz, 1.03 THz, 1.44 THz and 1.89 THz, with the absorption rates of 99.9%, 90.3%, 83.0%, 96.1%, respectively. Two single band metamaterial absorbers and a dual band metamaterial absorber on the top layer are designed. Some multi-band absorbers can be designed by virtue of combining some single band absorbers. The multiple-reflection theory is used to explain the absorption mechanism of our investigated structures.

  16. The structure and effect of suture zones in the Larsen C Ice Shelf, Antarctica

    NASA Astrophysics Data System (ADS)

    McGrath, Daniel; Steffen, Konrad; Holland, Paul R.; Scambos, Ted; Rajaram, Harihar; Abdalati, Waleed; Rignot, Eric

    2014-03-01

    Ice shelf fractures frequently terminate where they encounter suture zones, regions of material heterogeneity that form between meteoric inflows in ice shelves. This heterogeneity can consist of marine ice, meteoric ice with modified rheological properties, or the presence of fractures. Here, we use radar observations on the Larsen C Ice Shelf, Antarctica, to investigate (i) the termination of a 25 km long rift in the Churchill Peninsula suture zone, which was found to contain ~60 m of accreted marine ice, and (ii) the along-flow evolution of a suture zone originating at Cole Peninsula. We determine a steady state field of basal melting/freezing rates and apply it to a flowline model to delineate the along-flow evolution of layers within the ice shelf. The thickening surface wedge of locally accumulated meteoric ice, which likely has limited lateral variation in its mechanical properties, accounts for ~60% of the total ice thickness near the calving front. Thus, we infer that the lower ~40% of the ice column and the material heterogeneities present there are responsible for resisting fracture propagation and thereby delaying tabular calving events, as demonstrated in the >40 year time series leading up to the 2004/2005 calving event for Larsen C. This likely represents a highly sensitive aspect of ice shelf stability, as changes in the oceanic forcing may lead to the loss of this heterogeneity.

  17. Melt-spun bioactive sutures containing nanohybrids for local delivery of anti-inflammatory drugs.

    PubMed

    Catanzano, Ovidio; Acierno, Stefano; Russo, Pietro; Cervasio, Mariarosaria; Del Basso De Caro, Marialaura; Bolognese, Adele; Sammartino, Gilberto; Califano, Luigi; Marenzi, Gaetano; Calignano, Antonio; Acierno, Domenico; Quaglia, Fabiana

    2014-10-01

    In this work, a novel concept is introduced in drug-eluting fibres to ensure a good control of drug delivery features and wide applicability to different bioactive compounds. Composite bioactive sutures based on fibre grade poly(?-caprolactone) (PCL) and loaded with the anti-inflammatory drug Diclofenac (Dic) or a Dic nanohybrid where the drug is intercalated in a synthetic hydrotalcite (Mg/Al hydroxycarbonate) (HT-Dic) were developed. Fibres were prepared by melt-spinning at different PCL/HT-Dic/Dic ratios and analysed in terms of morphology, mechanical properties and drug release features. Results emphasized that tensile properties of fibres are clearly affected by Dic or HT-Dic addition, while the presence of knots has limited influence on the mechanical behaviour of the sutures. Release of Dic strongly depends on how Dic is loaded in the fibre (as free or nanohybrid) whereas the combination of free Dic and HT-Dic can allow a further tuning of release profile. In vivo experiments show a reduction of inflammatory responses associated with Dic-loaded fibers. Thus, a proof of principle is provided for a novel class of bioactive sutures integrating advanced controlled-release technologies. PMID:25175217

  18. Oesophageal flap valvuloplasty and wrapping suturing prevent gastrooesophageal reflux disease in dogs after oesophageal anastomosis

    PubMed Central

    Dai, Ji-Gang; Liu, Quan-Xing; Den, Xu-Feng; Min, Jia-Xin

    2014-01-01

    AIM: To examine the efficiency of oesophageal flap valvuloplasty and wrapping suturing technique in decreasing the rate of postoperative gastrooesophageal reflux disease in a dog model. METHODS: We operated on 10 dogs in this study. First, we resected a 5-cm portion of the distal oesophagus and then restored the continuity of the oesophageal and gastric walls by end-to-end anastomosis. A group of five dogs was subjected to the oesophageal flap valvuloplasty and wrapping suturing technique, whereas another group (control) of five dogs was subjected to the stapling technique after oesophagectomy. The symptom of gastrooesophageal reflux was recorded by 24-h pH oesophageal monitoring. Endoscopy and barium swallow examination were performed on all dogs. Anastomotic leakage was observed by X-ray imaging, whereas benign anastomotic stricture and mucosal damage were observed by endoscopy. RESULTS: None of the 10 dogs experienced anastomotic leakage after oesophagectomy. Four dogs in the new technology group resumed regular feeding, whereas only two of the dogs in the control group tolerated solid food intake. pH monitoring demonstrated that 25% of the dogs in the experimental group exhibited reflux and that none had mucosal damage consistent with reflux. Conversely, both reflux and mucosal damage were observed in all dogs in the control group. CONCLUSION: The oesophageal flap valvuloplasty and wrapping suturing technique can improve the postoperative quality of life through the long-term elimination of reflux oesophagitis and decreased stricture formation after primary oesophageal anastomosis. PMID:25516655

  19. Development of advanced antimicrobial and sterilized plasma polypropylene grafted muga (antheraea assama) silk as suture biomaterial.

    PubMed

    Gogoi, Dolly; Choudhury, Arup Jyoti; Chutia, Joyanti; Pal, Arup Ratan; Khan, Mojibur; Choudhury, Manash; Pathak, Pallabi; Das, Gouranga; Patil, Dinkar S

    2014-04-01

    Surface modification of silk fibroin (SF) materials using environmentally friendly and non-hazardous process to tailor them for specific application as biomaterials has drawn a great deal of interest in the field of biomedical research. To further explore this area of research, in this report, polypropylene (PP) grafted muga (Antheraea assama) SF (PP-AASF) suture is developed using plasma treatment and plasma graft polymerization process. For this purpose, AASF is first sterilized in argon (Ar) plasma treatment followed by grafting PP onto its surface. AASF is a non-mulberry variety having superior qualities to mulberry SF and is still unexplored in the context of suture biomaterial. AASF, Ar plasma treated AASF (AASFAr ) and PP-AASF are subjected to various characterization techniques for better comparison and the results are attempted to correlate with their observed properties. Excellent mechanical strength, hydrophobicity, antibacterial behavior, and remarkable wound healing activity of PP-AASF over AASF and AASFAr make it a promising candidate for application as sterilized suture biomaterial. © 2013 Wiley Periodicals, Inc. Biopolymers 101: 355-365, 2014. PMID:23913788

  20. Smart tissue anastomosis robot (STAR): a vision-guided robotics system for laparoscopic suturing.

    PubMed

    Leonard, Simon; Wu, Kyle L; Kim, Yonjae; Krieger, Axel; Kim, Peter C W

    2014-04-01

    This paper introduces the smart tissue anastomosis robot (STAR). Currently, the STAR is a proof-of-concept for a vision-guided robotic system featuring an actuated laparoscopic suturing tool capable of executing running sutures from image-based commands. The STAR tool is designed around a commercially available laparoscopic suturing tool that is attached to a custom-made motor stage and the STAR supervisory control architecture that enables a surgeon to select and track incisions and the placement of stitches. The STAR supervisory-control interface provides two modes: A manual mode that enables a surgeon to specify the placement of each stitch and an automatic mode that automatically computes equally-spaced stitches based on an incision contour. Our experiments on planar phantoms demonstrate that the STAR in either mode is more accurate, up to four times more consistent and five times faster than surgeons using state-of-the-art robotic surgical system, four times faster than surgeons using manual Endo360(°)®, and nine times faster than surgeons using manual laparoscopic tools. PMID:24658254

  1. Bioabsorbable Suture Anchor Migration to the Acromioclavicular Joint: How Far Can These Implants Go?

    PubMed Central

    Garofo, Guilherme; D'Elia, Caio O.; Bitar, Alexandre C.

    2014-01-01

    Few complications regarding the use of bioabsorbable suture anchors in the shoulder have been reported. What motivated this case report was the unusual location of the anchor, found in the acromioclavicular joint which, to our knowledge, has never been reported so far. A 53-year old male with previous rotator cuff (RC) repair using bioabsorbable suture anchors presented with pain and weakness after 2 years of surgery. A suspicion of retear of the RC led to request of a magnetic resonance image, in which the implant was found located in the acromioclavicular joint. The complications reported with the use of metallic implants around the shoulder led to the development of bioabsorbable anchors. Advantages are their absorption over time, minimizing the risk of migration or interference with revision surgery, less artifacts with magnetic resonance imaging, and tendon-to-bone repair strength similar to metallic anchors. Since the use of bioabsorbable suture anchors is increasing, it is important to know the possible complications associated with these devices. PMID:25114822

  2. Outcome analysis for correction of single suture craniosynostosis using resorbable fixation.

    PubMed

    Losken, A; Williams, J K; Burstein, F D; Cohen, S R; Hudgins, R; Boydston, W; Reisner, A; Simms, C

    2001-09-01

    A retrospective review was performed on 63 patients at Childrens Healthcare of Atlanta at Scottish Rite who underwent correction of single-suture craniosynostosis using a resorbable fixation system. Included in the series were 24 patients with metopic synostosis, 15 with sagittal synostosis, and 24 with unicoronal synostosis. The average age at operation was 22.7 months (range: 2.8 months-18 years), and mean follow-up time was 30.7 months (range: 7.1-10 years). Reoperation equal to or exceeding the magnitude of the original procedure occurred in 4.76% of the patients. This was comparable to the reoperation rate observed at our institution using traditional fixation systems. Minor complications related to the use of resorbable plates were also identified, and the final outcome for single-suture synostosis was favorable. Results suggest that resorbable plates and screws are as effective as titanium-based systems in the treatment of single-suture synostosis. PMID:11572250

  3. Chord diagrams, topological quantum field theory, and the sutured Floer homology of solid tori

    E-print Network

    Mathews, Daniel

    2009-01-01

    We investigate contact elements in the sutured Floer homology of solid tori, as part of the (1+1)-dimensional TQFT defined by Honda--Kazez--Mati\\'{c}. We find that these sutured Floer homology vector spaces form a "categorification of Pascal's triangle", a triangle of vector spaces, with contact elements corresponding to chord diagrams and forming distinguished subsets of order given by the Narayana numbers. We find natural "creation and annihilation operators" which allow us to define a QFT-type basis consisting of contact elements. We show that sutured Floer homology in this case reduces to the combinatorics of chord diagrams. We prove that contact elements are in bijective correspondence with comparable pairs of basis elements with respect to a certain partial order, and in a natural and explicit way. We use this to extend Honda's notion of contact category to a 2-category. We also prove numerous results about the structure of contact elements, investigate various algebraic structures arising, and give num...

  4. The behaviour of knots and sutures during the first 12 hours following a Bankart repair.

    PubMed

    Hughes, Peter J; Kerin, Cronan; Hagan, Richard P; Fisher, Anthony C; Frostick, Simon P

    2008-10-01

    It has been reported that the effectiveness of arthroscopic procedures in terms of preventing recurrent dislocation has not matched that from open techniques. Also little is known about how these knots behave when exposed to physiological loading following repair. This study presents the development of a practical tool to allow surgeons to test the quality of their arthroscopic knots and allow them to make choices with regard to knot configuration and suture material. This study uses an apparatus to model the repair of a Bankart lesion. Ten examples of the Duncan loop and SMC knots were tied using PDS, Ethibond, Panacryl and Fibrewire. An arthroscopic knotting technique was used. Reverse slippage occurring during the tying process was recorded. Each knot was then left for 12 hours under loads equivalent to a Bankart repair and the subsequent reverse slippage was recorded. After initial passing of the Duncan loop and after passing of locking hitches the sutures were ranked inversely to size of suture loop (resistance to slippage). Only Fibrewire showed a significant difference (5.7 +/- 1.03 mm to 5.66 +/- 0.5 mm; p <0.05). After 12 hrs, some evidence of reverse slippage was noted, especially with Fibrewire (5.66 +/- 0.5 mm--significant p <0.05). The SMC knot showed generally inferior results. In this study using arthroscopic techniques, Fibrewire performed less well than other materials. PMID:19058691

  5. Spectral simulation and shock absorber identification

    Microsoft Academic Search

    W. Schiehlen; B. Hu

    2003-01-01

    In vehicle dynamics shock absorbers are used for the optimization of driving comfort and driving safety. Therefore, it is necessary to identify characteristics of shock absorbers under real conditions. This paper introduces the use of hardware-in-the-loop simulations for the identification of shock absorbers involving stochastic models of the road roughness. For this purpose a dynamic hydraulic test stand is used

  6. Design of a magnetorheological automotive shock absorber

    Microsoft Academic Search

    Jason E. Lindler; Glen A. Dimock; Norman M. Wereley

    2000-01-01

    Double adjustable shock absorbers allow for independent adjustment of the yield force and post-yield damping in the force versus velocity response. To emulate the performance of a conventional double adjustable shock absorber, a magnetorheological (MR) automotive shock absorber was designed and fabricated at the University of Maryland. Located in the piston head, an applied magnetic field between the core and

  7. Double Adjustable Shock Absorbers Using Electrorheological Fluid

    Microsoft Academic Search

    J. E. Lindler; N. M. Wereley

    1999-01-01

    Double adjustable shock absorbers allow for adjustment of their yield force and post-yield damping. To emulate the performance of a conventional double adjustable shock absorber, an electrorheological (ER) automotive shock absorber was designed and fabricated at the University of Maryland. An applied electric field between two tubular electrodes, located in the piston head, increases the force required for a given

  8. A comparison of single-suture and double-suture incision closures in seaward-migrating juvenile Chinook salmon implanted with acoustic transmitters: implications for research in river basins containing hydropower structures

    SciTech Connect

    Brown, Richard S.; Deters, Katherine A.; Cook, Katrina V.; Eppard, M. B.

    2013-07-15

    Reductions in the size of acoustic transmitters implanted in migrating juvenile salmonids have resulted in the ability to make shorter incisions that may warrant using only a single suture for closure. However, it is not known if one suture will sufficiently hold the incision closed, particularly when outward pressure is placed on the surgical site such as when migrating fish experience pressure changes associated with passage at hydroelectric dams. The objective of this research was to evaluate the effectiveness of single-suture incision closures on juvenile Chinook salmon (Oncorhynchus tshawytscha). Juvenile Chinook salmon were surgically implanted with a 2012 Juvenile Salmon Acoustic Telemetry System (JSATS) transmitter (0.30 g) and a passive integrated transponder tag (0.10 g) and incisions were closed with either one suture or two sutures. Mortality and tag retention were monitored and fish were examined after 7 and 14 days to evaluate tissue responses. In a separate experiment, surgically implanted fish were exposed to simulated turbine passage and then examined for expulsion of transmitters, expulsion of viscera through the incision, and mortal injury. With incisions closed using a single suture, there was no mortality or tag loss and similar or reduced tissue reaction compared to incisions closed with two sutures. Further, surgery time was significantly reduced when one suture was used, which leads to less handling and reduced stress. No tags were expelled during pressure scenarios and expulsion of viscera only occurred in two non-mortally injured fish (5%) with single sutures that were also exposed to very high pressure changes. No viscera expulsion was present in fish exposed to pressure scenarios likely representative of hydroturbine passage at many Columbia River dams (e.g. <2.7 ratio of pressure change; an acclimation pressure of 146.2 absolute kpa and a lowest exposure pressure of ~ 53.3 absolute kpa). Based on these results, we recommend the use of a single suture for surgical implantation of transmitters with incisions that are approximately 5 1/2 mm long after tag insertion.

  9. Sutures versus staples for wound closure in orthopaedic surgery: a randomized controlled trial

    PubMed Central

    2012-01-01

    Background A recently published meta-analysis comparing metallic staples to sutures in orthopaedic procedures revealed three fold increase in risk for infection in stapled wounds. The studies included in the meta-analysis are at risk of bias due to experimental design limitations. A large randomized controlled trial is proposed to direct orthopaedic surgeons in their choice of wound closure material. Methods/Design A parallel group randomized controlled trial with institutional review board approval will be conducted. Patients will be randomized intraoperatively to have skin wounds closed with sutures or staples. Dressings will be used to maintain blinding outcome assessors. The primary outcome measure will be a composite all-cause wound complication outcome measure composed of: infection, wound drainage, wound necrosis, blistering, dehiscence, suture abscess and material sensitivity reaction. An independent review board blinded to treatment assignment will adjudicate suspected complications based on clinical data. All deceased patients will also be reviewed. An interim analysis of complications will take place after half of the patients have been recruited. All data will be analyzed by a blinded statistician. Dichotomous primary and secondary outcome measures will be analyzed using the Chi-squared statistic. Continuous outcome measures will be analyzed using Student's?t-test. Subgroup analysis will compare infection rates using sutures versus staples in each anatomic area (upper extremity, pelvis/acetabulum, hip/femur, knee, ankle). A further subgroup analysis will be conducted comparing trauma patients to elective surgery patients. Non-infected revision surgery will also be compared to primary surgery. Discussion Wound closure material is an afterthought for many orthopaedic surgeons. The combined results of several comparative trials suggests that the choice of wound closure materials may have an impact on the rate of surgical site infections. However, the strength of the evidence is poor given the heterogeneity of the methods employed in previous studies. The following study protocol aims to guide surgeons in their choice of wound closure material by determining if there is a difference in complication rates in sutured and stapled wounds. Trial Registration This trial was registered at ClinicalTrials.gov under the identifier NCT01146236 (registered June 14, 2010) PMID:22672186

  10. Porcelain enamel neutron absorbing material

    DOEpatents

    Iverson, D.C.

    1987-11-20

    A porcelain enamel composition as a neutron absorbing material can be prepared of a major proportion by weight of a cadmium compound and a minor proportion of compound of boron, lithium and silicon. These compounds in the form of a porcelain enamel coating or layer on several alloys has been found to be particularly effective in enhancing the nuclear safety of equipment for use in the processing and storage of fissile material. The composition of the porcelain enamel coating can be tailored to match the coefficient of thermal expansion of the equipment to be coated and excellent coating adhesion can be achieved. 2 figs.

  11. Graphene based salisbury screen for terahertz absorber

    NASA Astrophysics Data System (ADS)

    Min Woo, Jeong; Kim, Min-Sik; Woong Kim, Hyun; Jang, Jae-Hyung

    2014-02-01

    A graphene-based, multiband absorber operating in terahertz (THz) frequency range was demonstrated. Graphene film was transferred onto the top of a flexible polymer substrate backed with a gold reflector. The graphene acts as a resistive film that partially attenuates and reflects THz waves. The destructive interference between THz waves reflected from graphene and backside reflector gives rise to perfect absorbance at multiple frequencies. To enhance the absorbance on/off ratio (AR), the conductivity of graphene was varied using a chemical doping method. The resulting p-doped, graphene-based THz absorber exhibited absorbance at maxima and AR higher than 0.95 and 25 dB, respectively.

  12. Effects of suture material and ultrasonic transmitter size on survival, growth, wound healing, and tag expulsion in rainbow trout

    USGS Publications Warehouse

    Ivasauskas, T.J.; Bettoli, P.W.; Holt, T.

    2012-01-01

    We examined the effects of suture material (braided silk versus Monocryl) and relative ultrasonic transmitter size on healing, growth, mortality, and tag retention in rainbow trout Oncorhynchus mykiss. In experiment 1, 40 fish (205-281mmtotal length [TL], 106-264 g) were implanted with Sonotronics IBT-96-2 (23??7 mm; weight in air, 4.4 g; weight in water, 2.4 g) or IBT 96-2E (30 ?? 7 mm; weight in air, 4.9 g; weight in water, 2.4 g) ultrasonic telemetry tags. In experiment 2, 20 larger fish (342-405 mm TL; 520-844 g) were implanted with Sonotronics IBT-96-5 ultrasonic tags (36 ?? 11 mm; weight in air, 9.1 g; weight in water, 4.1 g). The tag burdens for all implanted fish ranged from 1.1% to 3.4%, and fish in both studies were held at 10-15??C. At the conclusion of both experiments (65 d after surgery), no mortalities were observed in any of the 60 tagged fish, most incisions were completely healed, and all fish in both experiments grew in length, although tagged fish grew more slowly than control fish in experiment 1. In both experiments, fish sutured with silk expelled tags more frequently than those sutured with Monocryl. Expulsion was observed in 45-50% of the fish sutured with silk and 0-25% of the fish sutured withMonocryl. Tag expulsion was not observed until 25-35 d after surgery. Fish sutured with silk exhibited a more severe inflammatory response 3 weeks after surgery than those sutured with Monocryl. In experiment 1, the rate of expulsion was linked to the severity of inflammation. Although braided silk sutures were applied faster than Moncryl sutures in both experiments, knots tied with either material were equally reliable and fish sutured with Monocryl experienced less inflammation and lower rates of tag expulsion. American Fisheries Society 2012.

  13. Comparison of the effectiveness of one- and two-suture prosthesis used to correct left laryngeal hemiplegia in the equine: followed by Nd:YAG laser ventricle ablation

    Microsoft Academic Search

    Cindy Burnett; Lloyd P. Tate; Maria T. Correa

    1992-01-01

    The effectiveness of one or two suture prothesis in performing laryngoplasty was compared. Forty-six horses treated for left laryngeal hemiplegia at North Carolina State University, College of Veterinary Medicine (NCSU-CVM) between January 1987 and April 1991 were included in the study. Thirty-seven of the horses were treated with two sutures, while nine were treated with one suture. All horses, after

  14. Small bowel volvulus after transabdominal preperitoneal hernia repair due to improper use of V-Loc™ barbed absorbable wire – do we always “read the instructions first”?

    PubMed Central

    Filser, Joerg; Reibetanz, Joachim; Krajinovic, Katica; Germer, Christoph-Thomas; Dietz, Ulrich Andreas; Seyfried, Florian

    2015-01-01

    Introduction Transabdominal preperitoneal endoscopic hernia repair (TAPP) is part of primary surgical health care. While both, the reported recurrence rate and procedure specific morbidity are consistently low, rare serious complications occur. Presentiation of case A 36-year-old male patient developed bowel obstruction three days after both-sided TAPP for inguinal hernia repair. A computer tomography scan of the abdomen revealed a small bowel volvulus in the right lower quadrant of the abdomen requiring urgent revisional surgery. Intraoperatively, the small bowel and its mesenterial vessels were found to be twisted around a 5 cm long V-Loc™ barbed absorbable suturing wire. After successful laparoscopic adhesiolysis, removal of the wire and detorquing of the bowel conglomerate, resection of small intestine was not necessary. The patient's further postoperative recovery was uneventful. Discussion Due to the barbed configuration of the V-Loc™ wire, a gapless continuous suturing of the peritoneum without laparoscopic knotting is easily and fast to accomplish. In this case the recommendation of the manufacturer to shorten the wire was not strictly followed and neither had the suture stump been extraperitonealized in order to avoid such rare complications. Conclusion Surgeons need to be aware of relevant “tricks and traps” of routinely performed procedures and have to know all tools and material they use very well. This case may therefore increase our attention when it comes to little things which actually do matter. PMID:25704567

  15. Oxalate: Effect on calcium absorbability

    SciTech Connect

    Heaney, R.P.; Weaver, C.M. (Creighton Univ., Omaha, NE (USA))

    1989-10-01

    Absorption of calcium from intrinsically labeled Ca oxalate was measured in 18 normal women and compared with absorption of Ca from milk in these same subjects, both when the test substances were ingested in separate meals and when ingested together. Fractional Ca absorption from oxalate averaged 0.100 +/- 0.043 when ingested alone and 0.140 +/- 0.063 when ingested together with milk. Absorption was, as expected, substantially lower than absorption from milk (0.358 +/- 0.113). Nevertheless Ca oxalate absorbability in these women was higher than we had previously found for spinach Ca. When milk and Ca oxalate were ingested together, there was no interference of oxalate in milk Ca absorption and no evidence of tracer exchange between the two labeled Ca species.

  16. Interseismic deformation across the middle part of the Longitudinal Valley suture, eastern Taiwan

    NASA Astrophysics Data System (ADS)

    Chin, Z. N.; Shyu, J. H.; Chen, H.

    2013-12-01

    The Longitudinal Valley in eastern Taiwan is generally considered as the suture between the Philippine Sea plate and the Eurasian plate. Many historical large earthquakes occurred along this suture. The southern part of the Longitudinal Valley has attracted many studies, mostly of the rapid-creeping Chihshang segment of the Longitudinal Valley fault. However, only a few detailed studies focused on the middle part of the valley. In order to understand the interseismic deformation patterns there, we analyzed GPS (Global Positioning System) measurements and leveling results to obtain the velocity field and strain pattern. Our analysis intended to understand the activities of the Longitudinal Valley fault and the Central Range fault in the Rueisuei and Yuli areas, both in the middle part of the valley. We calculated the GPS velocity field from continuous stations installed by the Central Weather Bureau and Academia Sinica that have been measured in the past twelve years, as well as campaign-mode stations measured at least annually from 2003-2012. We calculated the velocity field and velocity cross-sections across the middle segments of the Longitudinal Valley fault and the Central Range fault, and derived interseismic block model for these two faults using the data from GPS and leveling. The results show that the Rueisuei and Yuli areas are both characterized by compressional deformation in northwest-southeast direction. In the northern Rueisuei area, the Central Range fault appears to have higher rates of reverse motion than in southern Rueisuei area. The Longitudinal Valley fault appears to have higher rates of both reverse and sinistral motions in the southern Rueisuei area. Our geodetic analysis provides new observations of interseismic deformation patterns of the two major structures in the middle part of the Longitudinal Valley suture. These new observations will enable us to further understand the earthquake hazard potential of this area.

  17. Comparison between sutureless and glue free versus sutured limbal conjunctival autograft in primary pterygium surgery

    PubMed Central

    Elwan, Shaaban A.M.

    2014-01-01

    Purpose To compare and evaluate the safety and efficacy of two surgical techniques for the management of primary pterygium. Design Prospective randomized clinical trial using the CONSORT 2010 Statement (Consolidated Standards of Reporting Trials) for parallel group randomized trials. Setting Department of Ophthalmology, Al-Minya University, Faculty of Medicine, Egypt. Methods The study included 150 eyes of 150 patients with primary pterygium. The mean age was 49 ± 12 years (range 24–74 years). Simple excision under local anesthesia was performed followed by closure of the bare sclera by suture less and glue free conjunctival autograft in 50 eyes of 50 patients (group 1), versus the conventional method of a sutured conjunctival autograft in 100 eyes of 100 patients (group 2). Results The pterygium recurrence rate was 6% for group 1, 8% for group 2. Graft dehiscence occurred in 4 eyes out of 50 (8%) in group 1. Graft retraction occurred in 6 (12%) out of 50 eyes for group 1 versus 6 eyes (6%) in group 2. Pyogenic granuloma occurred in 3 (3%) eyes out of 100 in group 2. No other serious complications were noted. At the 3 week visit the overall patient satisfaction score was statistically significantly higher for group 1 (P < 0.002) compared to group 2. At 3 months postoperatively, the gain in uncorrected visual acuity (UCVA) ranged from 0.2 to 0.5 Log MAR in 10 eyes. Conclusion Sutureless and glue free conjunctival autograft technique is easy, safe, effective, prevents potential adverse reactions encountered with the use of foreign materials. This technique has an acceptable pterygium recurrence rate that is comparable to conventional sutured conjunctival autograft for primary pterygium. PMID:25473346

  18. Two-suture fish-mouth end-to-side microvascular anastomosis with fibrin glue.

    PubMed

    Sacak, Bulent; Tosun, Ugur; Egemen, Onur; Sucu, Deniz Ozgur; Ozcelik, Ismail Bulent; Ugurlu, Kemal

    2012-07-01

    The most decisive step during free tissue transfers and replantation surgery may be respected as microvascular anastomosis. The conventional end-to-side anastomosis technique with simple interrupted sutures is well established and proven to be successful. On the other hand, conventional technique can be time consuming and can cause vascular thrombosis, vessel narrowing, and foreign-body reactions. Search for a more rapid and secure alternative to conventional technique is carried on. In this study, we defined a new technique for end-to-side anastomosis with fish-mouth incisions and application of fibrin glue and compared our results with those we obtained with conventional end-to-side anastomosis. We evaluated end-to-side anastomosis of carotid arteries of a total number of 64 Wistar-Albino rats. In control group (n = 32), conventional anastomoses with 8 to 10 sutures were performed. In experimental group (n = 32), fish-mouth incisions were applied first on the recipient artery, followed by performing anastomosis with only 2 corner sutures and applying commercially available fibrin glue. Time taken to perform the anastomosis was significantly shorter with the experimental group (P = 0.001), whereas early and late patency and aneurysm rates were comparable to those achieved with control group. Histological evaluation did not point out any significant differences between the groups. We have defined a rapid and safe alternative technique of end-to-side anastomosis with the use of fibrin glue. This method may be an alternative especially where multiple anastomoses are required or where it is difficult to approach anastomotic line, as it is easily performed, rapid, safe, and not involving any complex equipments. PMID:22777439

  19. A randomized study comparing outcomes of stapled and hand-sutured anastomoses in patients undergoing open gastrointestinal surgery.

    PubMed

    Chandramohan, S M; Gajbhiye, Raj Narenda; Agwarwal, Anil; Creedon, Erin; Schwiers, Michael L; Waggoner, Jason R; Tatla, Daljit

    2013-08-01

    Although stapling is an alternative to hand-suturing in gastrointestinal surgery, recent trials specifically designed to evaluate differences between the two in surgery time, anastomosis time, and return to bowel activity are lacking. This trial compared the outcomes of the two in subjects undergoing open gastrointestinal surgery. Adult subjects undergoing emergency or elective surgery requiring a single gastric, small, or large bowel anastomosis were enrolled into this open-label, prospective, randomized, interventional, parallel, multicenter, controlled trial. Randomization was assigned in a 1:1 ratio between the hand-sutured group (n?=?138) and the stapled group (n?=?142). Anastomosis time, surgery time, and time to bowel activity were collected and compared as primary endpoints. A total of 280 subjects were enrolled from April 2009 to September 2010. Only the time of anastomosis was significantly different between the two arms: 17.6?±?1.90 min (stapled) and 20.6?±?1.90 min (hand-sutured). This difference was deemed not clinically or economically meaningful. Safety outcomes and other secondary endpoints were similar between the two arms. Mechanical stapling is faster than hand-suturing for the construction of gastrointestinal anastomoses. Apart from this, stapling and hand-suturing are similar with respect to the outcomes measured in this trial. PMID:24426460

  20. Clinical outcome of arthroscopic reduction and suture for displaced acute and chronic tibial spine fractures.

    PubMed

    Ahn, Jin Hwan; Yoo, Jae Chul

    2005-03-01

    This paper reports the clinical outcome of the arthroscopic reduction and pull-out suture technique in acute and chronic displaced tibial spine anterior cruciate ligament (ACL) avulsion fractures. Between April 1997 and December 2000, 14 patients received an arthroscopic reduction and pull-out suturing of displaced tibial spine fractures (ACL avulsion fractures of tibia). Of 14 cases, ten were acute fractures and four were chronic nonunion fractures, in which all patients showed extension limitation. The mean follow-up period was 51 months (ranging from 30 to 80 months). At final follow-up, review of range of motion, Lachman test, anterior drawer test, KT-2000 arthrometer, Lysholm knee score, and Hospital for Special Surgery (HSS) score were evaluated. Compared to conventional pull-out suturing, several key modifications to surgical techniques were used. In all 14 patients, radiological bony union was detected at mean 12.3 weeks (range, 8-16 weeks) after surgery. All patients were able to return to their preinjury activity and sports level. At final follow-up, full range of motion was achieved in all patients. Anterior draw test, Lachman test, and KT-2000 (less than 3 mm side-to-side) were all negative in 13 patients. One female patient, who was 6 years old at the time of surgery, complained of no subjective instability, but showed Lachman grade I, and 5 mm side-to-side difference in KT-2000. She also revealed 10 degrees difference of genu recurvatum deformity. Two children (including the previously-mentioned 6-year-old female patient) showed leg-length discrepancy of 1 cm-the affected legs being longer-at final follow-up. The mean Lysholm knee scores were 95.6 (range, 92-100) and HSS knee scores were 96.4 (range, 91-100). Arthroscopic reduction with modified pull-out suturing technique in displaced tibial spine ACL avulsion fractures showed excellent union rate for both acute and chronic cases, without instability or extension limitations at minimum two-year follow-up. PMID:15756616

  1. Successful Angioplasty of a Superficial Femoral Artery Stenosis Caused by a Suture-Mediated Closure Device

    SciTech Connect

    Gemmete, Joseph J., E-mail: gemmete@umich.edu; Dasika, Narasimham; Forauer, Andrew R.; Cho, Kyung; Williams, David M. [University of Michigan, Ann Arbor, Michigan, Department of Radiology (United States)

    2003-08-15

    We report the successful angioplasty of an acute arterial narrowing after suture-mediated closure (SMC) of a femoral arterial puncture. A 75-year-old woman underwent a cerebral arteriogramvia a right common femoral artery puncture. The arteriotomy site was closed with a SMC device. Four days after placement the patient complained of pain in her right calf after walking. An arteriogram 7 days after SMC showed a severe focal stenosis at the origin of the superficial femoral artery involving the presumed puncture site. The lesion was successfully treated with balloon angioplasty. The patient at 6 months was asymptomatic.

  2. [Ways to improve the results of the staple suture use for the rectal anastomosis].

    PubMed

    Kit, O I; Gevorkian, Iu A; Soldatkina, N V

    2013-01-01

    Treatment results of 311 patients with rectal cancer T1-4N0-2M0-1, who received the anterior rectal resection with mechanic circular colorectal anastomosis, were analyzed. The minimal frequency of the anastomotic insufficiency was registered among the "end-to-side" anastomosis (3.75%). Mechanical suturing of the rectal stump did not increase the risk of insufficiency. The use of the preventive colostoma allows the formation of the primary anastomosis even in conditions of partial intestinal obstruction. The laparoscopic anterior rectal resections did not influence the insufficiency rate, being preferable considering the postoperative rehabilitation terms. PMID:24362290

  3. A new technique for suture rectopexy without resection for rectal prolapse

    Microsoft Academic Search

    C. A. H. Liyanage; G. Rathnayake; K. I. Deen

    2009-01-01

    Background  We surmised that if rectopexy was performed without dissection of the lateral rectal stalks in patients with full-thickness\\u000a rectal prolapse and normal preoperative transit, sigmoid resection may not be required. This study evaluated a new approach\\u000a to abdominal suture rectopexy for rectal prolapse.\\u000a \\u000a \\u000a \\u000a Methods  A total of 81 patients (57 male, 24 female; median age 37 years, range 5–82 years) with

  4. A hybrid active-passive sound absorber

    NASA Astrophysics Data System (ADS)

    Belov, V. D.; Migun, Yu. G.; Orlov, A. I.

    2012-07-01

    The structure of an active-passive sound absorber is considered, and issues concerning analytic and experimental studies of the efficiency of sound absorber operation are discussed. A description is presented of both the passive part of the hybrid sound absorber and the active system incorporated in it. A test bench constructed on the basis of a low-frequency acoustic interferometer for measuring the sound absorption coefficient and the input impedance of the hybrid sound absorber under normally incident sound waves is described. An algorithm is proposed for controlling the active system of the hybrid sound absorber. The operation efficiency of the active system controlled by the proposed algorithm is analytically investigated. The results obtained from the experimental study of the hybrid active-passive sound absorber on the measuring test bench are presented.

  5. Electromagnetic scattering by pyramidal and wedge absorber

    NASA Technical Reports Server (NTRS)

    Dewitt, Brian T.; Burnside, Walter D.

    1988-01-01

    Electromagnetic scattering from pyramidal and wedge absorbers used to line the walls of modern anechoic chambers is measured and compared with theoretically predicted values. The theoretical performance for various angles of incidence is studied. It is shown that a pyramidal absorber scatters electromagnetic energy more as a random rough surface does. The apparent reflection coefficient from an absorber wall illuminated by a plane wave can be much less than the normal absorber specifications quoted by the manufacturer. For angles near grazing incidence, pyramidal absorbers give a large backscattered field from the pyramid side-faces or edges. The wedge absorber was found to give small backscattered fields for near-grazing incidence. Based on this study, some new guidelines for the design of anechoic chambers are advocated because the specular scattering models used at present do not appear valid for pyramids that are large compared to the wavelength.

  6. Magnetic field effects on microwave absorbing materials

    NASA Technical Reports Server (NTRS)

    Goldberg, Ira; Hollingsworth, Charles S.; Mckinney, Ted M.

    1991-01-01

    The objective of this program was to gather information to formulate a microwave absorber that can work in the presence of strong constant direct current (DC) magnetic fields. The program was conducted in four steps. The first step was to investigate the electrical and magnetic properties of magnetic and ferrite microwave absorbers in the presence of strong magnetic fields. This included both experimental measurements and a literature survey of properties that may be applicable to finding an appropriate absorbing material. The second step was to identify those material properties that will produce desirable absorptive properties in the presence of intense magnetic fields and determine the range of magnetic field in which the absorbers remain effective. The third step was to establish ferrite absorber designs that will produce low reflection and adequate absorption in the presence of intense inhomogeneous static magnetic fields. The fourth and final step was to prepare and test samples of such magnetic microwave absorbers if such designs seem practical.

  7. Absorbent product and articles made therefrom

    NASA Technical Reports Server (NTRS)

    Dawn, F. S.; Correale, J. V. (inventors)

    1982-01-01

    A multilayer absorbent product for use in contact with the skin to absorb fluids is described. The product has a water pervious facing layer for contacting the skin, and a first fibrous wicking layer overlaying the water pervious layer. A first container section is defined by inner and outer layers of a water pervious wicking material in between a first absorbent mass and a second container section defined by inner and outer layers of a water pervious wicking material between what is disposed a second absorbent mass, and a liquid impermeable/gas permeable layer overlaying the second fibrous wicking layer.

  8. TPX/TFTR Neutral Beam energy absorbers

    SciTech Connect

    Dahlgren, F.; Wright, K.; Kamperschroer, J.; Grisham, L.; Lontai, L.; Peters, C.; VonHalle, A.

    1993-11-01

    The present beam energy absorbing surfaces on the TFTR Neutral Beams such as Ion Dumps, Calorimeters, beam defining apertures, and scrapers, are simple water cooled copper plates which wee designed to absorb (via their thermal inertia) the incident beam power for two seconds with a five minute coal down interval between pulses. These components are not capable of absorbing the anticipated beam power loading for 1000 second TPX pulses and will have to be replaced with an actively cooled design. While several actively cooled energy absorbing designs were considered,, the hypervapotron elements currently being used on the JET beamlines were chosen due to their lower cooling water demands and reliable performance on JET.

  9. Photoacoustic cavitation in spherical and cylindrical absorbers

    NASA Astrophysics Data System (ADS)

    Paltauf, G.; Schmidt-Kloiber, H.

    Photomechanical damage in absorbing regions or particles surrounded by a non-absorbing medium is investigated experimentally and theoretically. The damage mechanism is based on the generation of thermoelastic pressure by absorption of pulsed laser radiation under conditions of stress confinement. Principles of photoacoustic sound generation predict that the acoustic wave generated in a finite-size absorbing region must contain both compressive and tensile stresses. Time-resolved imaging experiments were performed to examine whether the tensile stress causes cavitation in absorbers of spherical or cylindrical shape. The samples were absorbing water droplets and gelatin cylinders suspended in oil. They were irradiated with 6-ns-long pulses from an optical parametric oscillator. Photoacoustic cavitation was observed near the center of the absorbers, even if the estimated temperature caused by absorption of the laser pulse did not exceed the boiling point. The experimental findings are supported by theoretical simulations that reveal strong tensile stress in the interior of the absorbers, near the center of symmetry. Tensile stress amplitudes depend on the shape of the absorber, the laser pulse duration, and the ratio of absorber size to optical absorption length. The photoacoustic damage mechanism has implications for the interaction of ns and sub-nslaser pulses with pigmented structures in biological tissue.

  10. A planar polarization-insensitive metamaterial absorber

    NASA Astrophysics Data System (ADS)

    Cheng, Yongzhi; Yang, Helin; Cheng, Zhengze; Xiao, Boxun

    2011-02-01

    The model of the polarization-insensitive metamaterial (MM) absorber composed of split cross-ring resonator (SCRR), cave-cross resonator (CCR) and dielectric substrate was proposed at microwave frequencies. Based on perfect impedance-matched ( z˜(?)=1) to the free space, the single unit cell could achieve near-unity absorbance by properly assembling the sandwich structure. We have simulated and measured the reflectivity and transmission properties of a planar MM absorber with the thickness of 0.6 mm. The absorptivity of a single layer MM absorber achieve greater than 96% around 10.07 GHz in experiments and 98% in simulations for incident electromagnetic (EM) wave with different polarizations.

  11. PolysorbR (an absorbable lactomer) staples, a safe closure technique for distal pancreatic resection

    PubMed Central

    Farkas, Gyula; Leindler, László; Márton, János; Lázár, György; Farkas Jr, Gyula

    2014-01-01

    AIM: To investigate twenty-year experience evaluated the use of the PolysorbR (an absorbable lactomer) staples for distal pancreatic resection. METHODS: The data on 150 patients [92 men, 58 women, mean age 52 (24-72) years] who underwent distal pancreatectomy (DP) in the last 20 years were collected prospectively from an electronic database. The diagnosis was confirmed by endoscopic retrograde cholangiopancreatography, sonography, computed tomography and/or magnetic resonance imaging. The indications for DP were focal pancreatic necrosis, spontaneous pancreatic fistulas, abscesses, pseudocysts, segmental chronic obstructive pancreatitis in the tail, traumatic disruption, and benign (cystadenomas, insulinomas, or glucagonomas) or malignant tumours. The distal resections were performed without splenectomy in 29 of the 150 patients (19%). In the event of splenectomy, the splenic artery and vein were individually ligated, the TA-55 Auto Suture stapler, loaded with Premium PolysorbR 55 staples (5.5 mm), was placed across the gland, and the trigger was pulled, the action of which produced two staggered absorbable suture lines. The gland distal to the stapler was then amputated with a scalpel on the TA-55 stapler and the two rows of staples were left in the proximal pancreatic stump. After the distal resection, a drainage tube was inserted into the pancreatic bed. RESULTS: The average duration of the operation was 150 min (range: 90-210 min) and no transfusion was indicated during the operation. After DP in one patient a type B fistula was diagnosed, which was treated successfully by conservative treatment comprising of 12-d octreotide medication (3 × 0.1 mg/d) and jejunal feeding. The incidence of postoperative pancreatic fistula was therefore 0.6%. Another 2 patients suffered postoperative pancreatitis, which was also conservatively treated. Reoperations were performed in 2 patients on the first or second postoperative day, necessitated by bleeding from the retroperitoneal region. The morbidity was 3.3% (5 patients), but no mortality occurred in the postoperative period. Overall, the postoperative period was uneventful without any complications (pancreatic fistula, abscess, bleeding or wound infection) in 145 patients. The length of the postoperative stay ranged between 8 and 16 d. For the 145 patients who had no any postoperative complications, the hospital stay was 8 or 9 d. No mortality occurred in the follow-up period (6 or 12 mo postoperatively); but 6 mo after surgery one patient suffered a pseudocyst following recurrent pancreatitis and was treated with cystojejunostomy. CONCLUSION: Our clinical results demonstrated that the application of absorbable lactomer staples for distal pancreatic resection is a safe alternative to the standard closure technique. PMID:25493034

  12. Bricolage Suture

    E-print Network

    Wilson, Robert Justin

    2014-05-31

    and needles now. Just three more hours. # Franklin bursts into the break room behind Macy’s, carrying a manila folder. He slams it down on the counter. “That greasy Manchester Filing Bird never does its goddamned job right. I spend thirty minutes every day... it whole, its tiny legs ticking his throat. He checks to make sure he filed the daily audit in the correct folder and closes the cabinet. # In row 3, seat B, Thea waits for the stewardess to finish. “... And if you’ll direct your attention to the front...

  13. Behavior of different suture materials in the urinary bladder of the rabbit with special reference to wound healing, epithelization and crystallization.

    PubMed

    Hanke, P R; Timm, P; Falk, G; Kramer, W

    1994-01-01

    Five urinary bladder incisions were performed in 16 rabbits and the defects closed by plain catgut 4-0, chromic catgut 4-0, polypropylene 4-0, polyglactin 910 4-0 and polyglactin 910 8-0 in the form of an all-layer suture, thereby obtaining a total of 80 suture sites. The running sutures in 8 animals were reviewed by light microscopy after 1, 2, 7 and 15 weeks, and in 8 additional animals after 3 days, 1, 2, 7 and 15 weeks by scanning electron microscopy. Moreover, we analyzed and compared the autopsy findings on gross inspection, the urinary sediments and urinary cultures of the individual animals. Scanning electron-microscopic evaluations showed that epithelization of the intraluminal suture portions can be accomplished after 3 days already. Reduced suture strength and rapid absorption of the suture material prevent later postoperative incrustations. Light-microscopic inspection of the segments of the bladder wall bearing this suture material suggests that a minor inflammatory tissue response around the suture material--with polyglactin 910 8-0 in particular--is more likely to enhance regeneration of the tunica muscularis and to prevent formation of cysts than seen with a long-standing highly inflammatory tissue response around the suture site of catgut threads. In the animal experiment, the polyglactin 910 suture has shown sufficient firmness and proved to be superior to any other suture material as regards the reaction to foreign bodies and inclination to incrustation.(ABSTRACT TRUNCATED AT 250 WORDS) PMID:8140676

  14. All-Arthroscopic Knotless Suture Anchor Repair of Triangular Fibrocartilage Complex Fovea Tear by the 2-Portal Technique

    PubMed Central

    Park, Yongcheol

    2014-01-01

    After the importance of the deep fiber of the distal radioulnar ligament had been acknowledged, some repair techniques have been introduced. Because the knotless suture anchor does not cause any knot irritation and yields appropriate tension, it is a useful fixation material. All-arthroscopic knotless suture anchor repair of the triangular fibrocartilage complex fovea tear by a 2-portal technique is easier and less vulnerable to ulnar nerve injury than the original Geissler technique. Instead of the suture hook and accessory portal, this technique uses the always-sharp 18-gauge needle and percutaneous route. This change results in the repair of the complex fovea tear having the smallest possible remnant tissue. Repair of triangular fibrocartilage complex fovea tears combined type IB, ID, and IIC tears can reduce the chance of needing to perform distal radioulnar ligament reconstruction. PMID:25685672

  15. Surgical implantation of radiotelemetry devices in American river otters.

    PubMed

    Hoover, J P

    1984-12-01

    The Oklahoma Department of Wildlife Conservation elected to investigate the feasibility of reintroducing American river otters (Lutra canadensis) into Oklahoma waterways. Intra-abdominal radiotelemetry devices were selected to monitor otter movements following release. For implantation of those devices, the anesthetic regimen included a mixture of ketamine HCl, xylazine, and acepromazine maleate given intramuscularly followed by delivery of isoflurane through precision vaporizers. A ventral midline approach and adherent surgical barrier drapes facilitated aseptic placement of the devices, with minimal tissue damage and loss of insulating pelage. Absorbable monofilament suture (polydioxanone) was used in a buried 3-layer closure of surgical incisions. The incisions healed rapidly and without complications. PMID:6511574

  16. Arthroscopic Posterior Bone Block Procedure: A New Technique Using Suture Anchor Fixation

    PubMed Central

    Boileau, Pascal; Hardy, Marie-Béatrice; McClelland, Walter B.; Thélu, Charles-Edouard; Schwartz, Daniel G.

    2013-01-01

    We present a novel all-arthroscopic technique of posterior shoulder stabilization that uses suture anchors for both bone block fixation and capsulolabral repair. The bone graft, introduced inside the glenohumeral joint through a cannula, is fixed with 2 suture anchors. The associated posteroinferior capsulolabral repair places the bone block in an extra-articular position. In this article we present the detailed arthroscopic technique performed in a consecutive series of 15 patients and report the early results. We also report the positioning, healing, and remodeling of the bone block using postoperative 3-dimensional computed tomography. The benefits of this new technique are as follows: (1) it is all arthroscopic, preserving the posterior deltoid and posterior rotator cuff muscles; (2) it is accurate, resulting in appropriate bone block positioning; (3) it is efficient, allowing for consistent bone graft healing; (4) it is anatomic, both restoring the glenoid bone stock and repairing the injured posterior labrum; and (5) it is safe, limiting hardware-related complications and eliminating the risk of injury to vital structures associated with drilling or screw insertion from posterior to anterior. We believe that this technique is advantageous because it does not use screws for fixation and may be safer for the patient. PMID:24892011

  17. Ocular decompression retinopathy following post-trabeculectomy suture lysis and management with triamcinolone acetonide.

    PubMed

    Tyagi, Pallavi; Hashim, Adnan A

    2011-10-01

    Ocular decompression retinopathy (ODR) is a rare complication of sudden lowering of intraocular pressure (IOP) in glaucoma and ocular hypertension. An 80-year-male, a known case of chronic open-angle glaucoma for 13 years, had his IOP controlled by multiple topical antiglaucoma medications. There was an increase in IOP, progression of optic disc cupping and visual field loss along with cataract over the past 6 months. The patient underwent uneventful phacoemulsification with posterior chamber intraocular lens (PCIOL) and penetrating trabeculectomy. Postoperatively, the trabeculectomy bleb was flat and IOP was 44 mmHg and was not controlled by bleb massage. Bleb needling and suture lysis were performed after 2 weeks. The IOP dropped from 44 to 6 mmHg. Three days later the patient presented with a sudden decline in visual acuity (VA) from 0.5 to 1.225 logMAR. The fundus showed multiple retinal haemorrhages resembling ODR. Choroidal detachment also occurred after 3 weeks. Optical coherence tomography confirmed the presence of macular oedema which was treated with an orbital floor triamcinolone acetonide injection (OFTA). The haemorrhages, choroidal detachment and macular oedema resolved and VA improved in 6 months. This is the first case report of ODR following suture lysis and needling after an uneventful combined phacoemulsification with PCIOL implant and trabeculectomy. It also highlights the role of OFTA injections in the management of ODR. PMID:22057789

  18. Late-Onset Citrobacter koseri Endophthalmitis with Suture Exposure after Secondary Intraocular Lens Implantation

    PubMed Central

    Kang, Hae Min

    2011-01-01

    A 54-year-old male patient was seen in clinic for ocular pain and decreased vision in the right eye with duration of two days. He underwent a cataract operation for his right eye 12 years ago, then a sclera-fixated secondary intraocular implantation and pars plana vitrectomy three years ago due to intraocular lens dislocation. At the initial visit, his visual acuity was restricted to the perception of hand motion. An edematous cornea, cells, flare with hypopyon, and exposed suture material at were observed at the six o'clock direction by slit lamp. Vitreous opacity was noted from B-scan ultrasonography. The patient was diagnosed with late-onset endophthalmitis and an intravitreal cocktail injection was done. On the next day, the hypopyon was aggravated, and therefore a pars plana vitrectomy was performed. A vitreous culture tested positive for Citrobacter koseri. After 12 weeks, the best corrected visual acuity of the right eye improved to 0.7 and a fundus examination revealed a relatively normal optic disc and retinal vasculature. We herein report the first case of endophthalmitis caused by Citrobacter koseri in Korea. Exposed suture material was suspected as the source of infection in this case and prompt surgical intervention resulted in a relatively good visual outcome. PMID:21860579

  19. Case Study: Reduction of Gluteal Implant Infection Rates with Use of Retention Sutures

    PubMed Central

    Connolly, Mark; Wiesman, Irvin

    2015-01-01

    Summary: The intramuscular technique has been the most popular technique among plastic surgeons for gluteal implantation. Complication rates of up to 30% including infection, hematoma, seromas, and dehiscence are reported in several studies. One main question that arises is whether the wound dehiscence occurs first followed by infection or vice versa. We present a case study of 3 patients who received gluteal augmentation. We used an alternative technique in closure of the gluteal flap which included the use of retention sutures along the sacral incision. Follow-up included postoperative day 2, every week for 6 weeks, and then every month for 6 months. Postoperatively patients were advised to not sleep in supine position for 3 weeks and avoid pressure to the area. The 3 patients remained infection free at 2 days and weekly for 6 weeks. The use of retention sutures along the flap closure site may be a useful and simple technique to avoid high gluteal implant infection rates that have been reported in the literature. We plan to apply this technique to all of our future gluteal augmentations and track long-term results. Preventing complications will result in improved aesthetic results, increased patient satisfaction, less frequent office visits, and less financial cost to both patient and physician. PMID:25674370

  20. Alternate Sequential Suture Tightening: A Novel Technique for Uncontrolled Postpartum Hemorrhage

    PubMed Central

    Ghosh, Sharda Brata; Mala, Y. M.

    2015-01-01

    Objective. The most commonly described technique of modified B-Lynch suture may not be suitable for all the patients presenting with flabby, atonic uterus. Study Design. A retrospective analysis of twelve patients with uncontrolled postpartum haemorrhage, who underwent this procedure from March 2007 to September 2012, was conducted. In this novel technique, sutures are passed in the lower uterine segment and are tightened alternately to control uterine bleeding. Results. Average duration of the procedure was 4 minutes (range 2–7 minutes). Average blood loss was 1625?mL (range 1300–1900?mL). Eleven patients (91.66%) were seen to have a successful outcome with only this technique. No patient required hysterectomy and one patient (8.33%) required additional bilateral internal iliac artery ligation. All the patients had a minimum follow-up of 2?yrs and none of them reported any infertility problems. Conclusion. This technique is simple, quick, and effective. There was no adverse effect on the fertility potential for the observed 2 years; however, a long-term follow-up is required to comment on its actual rate. This technique cannot replace the standard modified B-Lynch technique for uncontrolled postpartum haemorrhage but can be used for unresponsive, flabby, and atonic uterus.

  1. Long-term follow-up of a randomized controlled trial of suture versus mesh repair of incisional hernia

    Microsoft Academic Search

    Jacobus W. A. Burger; Roland W. Luijendijk; Wim C. J. Hop; Jens A. Halm; Emiel G. G. Verdaasdonk; Johannes Jeekel

    2004-01-01

    OBJECTIVE: The objective of this study was to determine the best treatment\\u000a of incisional hernia, taking into account recurrence, complications,\\u000a discomfort, cosmetic result, and patient satisfaction. BACKGROUND:\\u000a Long-term results of incisional hernia repair are lacking. Retrospective\\u000a studies and the midterm results of this study indicate that mesh repair is\\u000a superior to suture repair. However, many surgeons are still performing\\u000a suture

  2. Nonspecific iodine accumulation in surgical suture material mimicking follicular thyroid cancer bone metastasis in (131)I scintigraphy.

    PubMed

    Winkens, Thomas; Nietzsche, Sandor; Gottschaldt, Michael; Freesmeyer, Martin

    2014-02-01

    A 23-year-old man with follicular thyroid carcinoma and cervical lymph node metastases showed a clear I focus on the skull after radioiodine therapy; therefore, an osseous metastasis was suspected. I and MRI fusion suggested the I focus to be adjacent to an epicranial suture from an early childhood trepanation for epidural hematoma. Radio-guided surgery found dark brown material to be the source of the radiation and successfully removed the material. Subsequent electron microscopy revealed a thread within the dark brown material, suggesting suture material as the cause of I accumulation. PMID:24368531

  3. Structural and geochronological record of India-Asia suturing in the Lopu Kangri Range, south-central Tibet

    NASA Astrophysics Data System (ADS)

    Laskowski, A. K.; Kapp, P. A.

    2013-12-01

    Better constraining the geological evolution of the India-Asia suture zone is vital to our comprehension of the Himalayan-Tibetan orogen. This study presents new mapping, igneous U-Pb geochronology, and detrital zircon geochronology from suture zone rocks exposed in the Lopu Kangri Range. Located ~50 km NW of Saga in south-central Tibet, this range exposes a >1.5 km thick panel of suture zone architecture that was exhumed by late Cenozoic orogen-parallel extension across two N-S, moderate-angle normal faults. The Lopu Kangri Range and its surroundings expose all of the major suture-zone assemblages. In the north, Cretaceous--Eocene Gangdese arc granitoids are unconformably overlain by nonmarine, conglomerate-bearing strata of the Eocene (?)--Miocene Kailas Fm. Metaconglomerate exposed in the same structural position within the Range contains garnet porphyroblasts. Gangdese arc and metaconglomerate rocks are confined to the footwall of the north-directed Great Counter Thrust system, which carried Cretaceous-Early Eocene Xigaze forearc, suture zone mélange, and Indian passive margin (Tethyan) strata northwards across three major NE-SW fault strands during the Miocene. Tethyan strata in the Range consist of locally garnet- and sillimanite-bearing calc-gneiss and schist that display N-S stretching lineations and top-N s-c fabrics. These rocks are exposed in the southern half of the range beneath suture zone mélange in the footwall of a moderately N-dipping, normal-sense shear zone. Six detrital zircon samples from the Xigaze forearc, metaconglomerate and meta-Tethyan strata were analyzed to confirm our lithologic correlations and provenance interpretations made in the field. 12 igneous U-Pb samples were analyzed to characterize granitoids that intrude the Range. They reveal a suite of 50-40 Ma granitoids that display a general younging trend from north to south across the suture. Five samples of 35-10 Ma leucogranites contain inherited zircon cores whose age spectra suggest genesis by anatectic melting of Greater Himalayan rocks. Our initial results suggest that the Lopu Kangri Range records two distinct episodes of orogenic burial and exhumation during the Cenozoic. We propose that the N dipping shear zone accommodated an early phase (Eocene?) of orogen-perpendicular extension that exhumed amphibolite grade meta-Tethyan rocks. Garnet-bearing metaconglomerate, which we tentatively correlate to the Kailas Formation, suggests that a second episode of tectonic burial and exhumation initiated during the Miocene and culminated in ongoing orogen-parallel extension. Further testing of these interpretations may reveal that the Lopu Kangri Range records a rich, semi-continuous history of India-Asia suturing and Himalayan-Tibetan orogenesis.

  4. Highly efficient special sound absorbing solutions

    NASA Technical Reports Server (NTRS)

    Ionescu, M.; Petre-Lazar, S.

    1974-01-01

    Highly efficient special sound absorbing structures with the following criteria are considered: (1) A distribution surface of the sound absorbing material greater than that of the building element on which the structure is placed; (2) The highest possible absorption coefficient in the widest possible frequency band; and (3) adaptability to different construction and aesthetic conditions.

  5. Electrorheological Squeeze-Flow Shock Absorber

    Microsoft Academic Search

    Boris Khusid; Andreas Acrivos; Yakov Khodorkovsky; Michael Beltran

    1999-01-01

    We developed a squeeze-flow shock absorber and tested it under impact conditions typical of heavy-duty recoil mechanisms. In contrast to common shear-flow shock absorbers, here the volume of fluid driven by the piston does not flow through the regions of high electric field. Experiments on three commercially available \\

  6. Proton Absorber Feasibility Study Chris Rogers,

    E-print Network

    McDonald, Kirk

    Proton Absorber ­ Feasibility Study Chris Rogers, ASTeC, Rutherford Appleton Laboratory 14 Sept 2010 #12;Overview We have a problem with secondary protons in the front end Deposit significant Need remote handling (ouch) One way to fix this is using a proton absorber Change in beam power

  7. Catalytically deposited carbon solar selective absorber

    Microsoft Academic Search

    J. D. Garrison

    1982-01-01

    This selective absorber consists of a number of thin layers on a supporting substrate, including a carbonaceous absorbing layer, a catalyst layer, and a metallic infrared reflecting layer. The catalyst layer serves to catalyze the pyrolysis of a carbon containing gaseous compound to form the carbonaceous layer. Under proper conditions, the layer is black, strongly bonded to the surface, and

  8. Pyro-adaptive impact energy absorber

    Microsoft Academic Search

    Marian Ostrowski; Paulius Griskevicius; Jan Holnicki-Szulc

    The paper contains a proposal of energy dissipation density controlling in lightweight thinwalled structures by reducing their crushing stiffness during an impact process. For small scale laboratory experiments, low-energy-dissipation absorber was developed. Prismatic absorber made of thin lead sheets can dissipate the impact energy at two energy density levels. Moving the concept to the real steel or aluminum structures can

  9. Black nickel selective absorber, optimization of parameters

    Microsoft Academic Search

    B. Akinoglu; V. Cercioglu; A. Ecevit

    1983-01-01

    Electroplated black nickel selective absorber is one of the most commercially used element of solar energy systems. Electrodeposition parameters such as time of deposition, pH, current density, electrolyte temperature should be optimized to produce the most efficient selective absorber. The topology of the substrate material is very effective on selectivity and it should also be optimized. In this study, by

  10. An application of metamaterials: Perfect absorbers

    NASA Astrophysics Data System (ADS)

    Lee, Y. P.; Tuong, P. V.; Zheng, H. Y.; Rhee, J. Y.; Jang, W. H.

    2012-04-01

    We studied structures that describe the perfect-absorber effect by using different mechanisms. Firstly, we investigated the dependences of the reflectance and the absorbance of a metamaterial, as structure proposed by Landy et al. [Phys. Rev. Lett. 100, 207402 (2008)] on gap `g' of the structure at GHz frequencies. The value of the gap was obtained, which gives the maximum absorbance and the minimum reflectance. In addition, the change of geometry of the electric ring resonance as an I-shape made the reflectance disappear at the resonance frequency. A narrow-band peak of the perfect-absorber effect, which was enhanced to be greater than 99.5% at 13.5 GHz, was observed by using a multilayer model for the simplified absorber structure. Secondly, we investigated an absorber structure that includes two metal layers, periodic cut-wire bars at the front and a copper plane at the back, separated by a dielectric layer. The results showed that the absorbance and the resonance frequency of this structure strongly depended on the thickness and the length of the cut-wire bar, respectively. Base on these, we successfully designed a broad-band absorber structure by arranging cut-wire bars with different lengths appropriately in a "meta-atom".

  11. Shock energy absorber including collapsible energy absorbing element and break up of tensile connection

    SciTech Connect

    Miszewski, A.K.L.; Huber, K.B.

    1992-07-21

    This patent describes a shock absorber adapted to include a detonating cord for receiving and absorbing mechanical energy resultant from a shock. It comprises an outer housing; an inner housing; connection means for connecting the inner housing to the outer housing; break up means responsive to the detonation wave propagating in the detonating cord; collapsible energy absorbing element means responsive to the mechanical energy.

  12. An Absorbing Boundary Condition Based on Anechoic Absorber For EM Scattering Computation

    Microsoft Academic Search

    C. M. Rappaport; L. J. Bahrmasel

    1992-01-01

    A novel absorbing boundary condition (ABC), to be used with finite difference and finite element electromagnetic radiation and scattering problems is described. It is based on anechoic chamber absorber foam geometry, with specified complex permittivity and permeability. The advantage of this absorbing boundary is that it prevents reflections from much wider incident angles than currently used lattice termination conditions. Since

  13. Alkali burn versus suture-induced corneal neovascularization in C57BL/6 mice: an overview of two common animal models of corneal neovascularization.

    PubMed

    Giacomini, Chiara; Ferrari, Giulio; Bignami, Fabio; Rama, Paolo

    2014-04-01

    The purpose of the present study was to quantify and compare corneal hem- and lymphangiogenesis between alkali burn and suture-induced corneal neovascularization (CNV) in two commonly used mouse strains. A retrospective analysis was performed on C57BL/6 and FVB neovascularized corneas. CNV was induced by surface caustication with NaOH or intrastromal placement of three 10.0 nylon sutures. Hemangiogenesis and lymphangiogenesis extent was calculated on whole mounted corneas by CD31 and LYVE1 immunofluorescence analysis. Blood vessel growth was similar between alkali burn and suture-induced CNV in C57BL/6 mice, and between C57BL/6 and FVB sutured strains. On the contrary, corneal lymphangiogenesis was more pronounced in the C57BL/6 sutured mice versus the alkali burn group, and in the FVB strain versus both C57BL/6 models. These results indicate that significant differences occur in lymphangiogenesis, but not hemangiogenesis, in the alkali burn and suture-induced models in C57BL/6 mice. Furthermore, lymphangiogenesis is more pronounced in the albino (FVB) strain after suture placement. We suggest that the suture model has a number of advantages and may be preferentially used to study corneal lymphangiogenesis. PMID:24560796

  14. Where does the South Anju suture go to in the New Siberian Islands and Laptev Sea?: implication to the rotational hypothesis of the Amerasian Basin opening

    Microsoft Academic Search

    A. Kuzmichev; N. Bogdanov

    2003-01-01

    The South-Anuj suture is a trace of Late Palaeozoic-Jurassic ocean. The suture is believed to trend from the upper Big Anuj river (Chukotka) to Bigger Lyakhov Isl. (New Siberian Islands). It is commonly acknowledged that closing of the South Anuj Ocean at the end of Jurassic - beginning of Neocomian was synchronous with opening of the Amerasian oceanic basin. Most

  15. Porous metal absorbers for underwater sound.

    PubMed

    Wang, Xiaolin

    2007-11-01

    Rubber has traditionally been used for underwater sound absorption. Porous metal is a relatively lightweight material and also has higher strength than rubber. However, exactly how porous metals can be used as effective underwater sound absorbers remains unclear. This paper shows how to use porous metal absorbers so that they work well under water, even under fairly constrained conditions. A method of nondimensional analysis is proposed that allows identification of vital characteristics. This means that such characteristics can be varied and the absorbers themselves filled with different types of viscous fluids. Such analysis suggests that the sound absorption coefficient of porous metals does not always increase when there are either increases in porosity or decreases in average pore size. The same method of analysis can show how, by choice of the right characteristics to choose a suitable viscous fluid, a porous metal absorber can be built that takes up little space but still effectively absorbs underwater sounds at low frequencies. PMID:18189554

  16. Solar sustained plasma/absorber conceptual design

    NASA Technical Reports Server (NTRS)

    Rodgers, R. J.; Krascella, N. L.; Kendall, J. S.

    1979-01-01

    A space power system concept was evaluated which uses concentrated solar energy to heat a working fluid to temperatures as high as 4000 K. The high temperature working fluid could be used for efficient electric power production in advanced thermal or magnetohydrodynamic conversion cycles. Energy absorber configurations utilizing particles or cesium vapor absorber material were investigaed. Results of detailed radiant heat transfer calculations indicated approximately 86 percent of the incident solar energy could be absorbed within a 12-cm-dia flowing stream of gas borne carbon particles. Calculated total energy absorption in the cesium vapor seeded absorber configuration ranged from 34 percent to 64 percent of the incident solar energy. Solar flux concentration ratios of between approximately 3000 and 10,000 will be required to sustain absorber temperatures in the range from 3000 K to 4000 K.

  17. Flow regime of the Joerg Peninsula suture zone, Larsen C Ice Shelf: the role of marine ice

    NASA Astrophysics Data System (ADS)

    Jansen, D.; Luckman, A.; Kulessa, B.; King, E. C.; Holland, P.

    2012-04-01

    The flow units making up Antarctic ice shelves are fed primarily by discharge from glaciers. In the lee of peninsulae separating such units the ice is anomalously thin, as there is no or little ice inflow from the promontories itself. In these "gaps" between the flow units, super-cooled water is rising and freezing, leading to accretion of marine ice. Evidence for the existence of marine ice has been found in several Antarctic ice shelves of different geometry and scale. Marine-ice-rich suture zones are warmer, softer, more permeable than the surrounding flow units coming from tributary glaciers, and thus introduce significant mechanical heterogeneity to the ice shelf. In the first instance suture zones appear to have a stabilizing effect by interrupting rift or crevasse propagation. However, they might equally be regarded as particularly vulnerable, because due to its higher temperature and different structure marine ice is softer than meteoric ice, sustaining elevated velocity gradients across suture zones that could mechanically decouple neighbouring ice units. The amount of marine ice accretion is also subject to oceanic conditions, changes in ocean temperature could lead to less freezing and thinner ice within suture zones. This could weaken the coupling between flow units downstream of peninsulae, and thus impact critically on ice-shelf dynamics and fracturing. In this study we analyzed the basal mass balance of a suture zone within the Larsen C Shelf, Antarctic Peninsula, which is located downstream of the Joerg Peninsula in the southern part of the ice shelf. We obtained GPR and GPS data of the origin of the suture zone, covering an area of approx. 400 km2, as well as several GPR profiles across and along the suture zone further towards the calving front. This data set delineates in 3D the boundaries between the meteoric and marine ice bodies, provides meteoric ice thicknesses and densities and supports calculation of marine ice thicknesses assuming hydrostatic equilibrium. Mean accumulation rates for marine ice along the measured GPR profiles are 0.2 m per year (preliminary result). The freezing rates are also discussed in comparison to a basal mass balance derived by numerical modelling of the interaction of ice shelf and ocean. To quantify the influence of the warmer marine ice bands on the overall stress balance of the surrounding ice shelf area, we used a finite-difference, diagnostic ice-shelf model of which earlier versions have been applied successfully to the Larsen B and C Ice Shelves. Marine ice within suture zones was implemented by modifying appropriately the temperature dependent depth-integrated flow factor A in Glen's law. The simulated flow regime of the Joerg Peninsula suture zone in its current state could be validated by remotely sensed flow velocities. High lateral velocity gradients across the suture zone in the observed velocity coincide with the high gradients caused by warm suture zone ice in the modelled velocities. Further sensitivity studies have been performed to test how changing freezing rates (i.e. amount of marine ice) and changing inflow velocities of the joining ice units affect their merging process.

  18. Interpretations of suture zones in Norway and adjacent areas - results from new aeromagnetic and gravity compilations

    NASA Astrophysics Data System (ADS)

    Olesen, O.; Brönner, M.; Ebbing, J.; Gernigon, L.

    2009-04-01

    The Geological Survey of Norway (NGU) is releasing new aeromagnetic and gravity maps of Norway and adjacent sea areas. The aeromagnetic compilation consists of 22 onshore surveys and more than 40 offshore surveys. The vintage offshore surveys have been reprocessed with an innovative moving mean levelling technique. The gravity map is based on a total of 68.000 gravity stations on the mainland acquired by NGU, SK and Norwegian and foreign academic institutions in addition to more than 500.000 km of marine gravity profiles acquired by NPD, SK, TGS and Norwegian and foreign petroleum companies. We have produced an Airy isostatic residual map, enhancing crustal anomalies better than traditional free air and Bouguer anomaly maps. We have recognized that petrophysical measurements on core samples, hand specimens and in situ on bedrock exposures are essential for the interpretation of these anomalies. Petrophysical data (density, magnetic susceptibility and remanence) of 40.000 rock samples from the Norwegian mainland and susceptibility measurements of c. 7000 metres of cores from offshore drill holes have been acquired in order to constrain the interpretation of aeromagnetic and gravity data. Some of the most prominent gravity and magnetic anomalies in the region are attributed to lower crustal rocks occurring at a shallow level in the crust e.g. along the Lapland Granulite Belt in northern Fennoscandia, along the Bamble-Kongsberg Complex in southern Norway and in the Lofoten area. The emplacement of high grade and high-density lower crustal on top of upper crustal rocks produces a distinct gravity anomaly with a steep gradient along the suture zone and a much gentler gradient on the hinterland side. The asymmetry of the gravity anomalies along the Lapland Granulite Belt and Kongsberg-Bamble Complex, combined with the steep gradient, points to the over-thrusted high-grade and high-density granulites as the main source of the observed positive gravity anomaly. The Bouguer gravity anomaly associated with the Kongsberg-Bamble complex can be traced southwards through the Kattegat to the Scania region in southern Sweden. This asymmetric anomaly has previously been related to deep-seated mafic intrusions of Permian age. Our new suture zone interpretation is in accordance with reflection seismic data from northern Skagerrak and Bornholm areas. The regional suture zones were later reactivated as continental rifts. This concept of gravity field modeling can also be applied to the mid-Norwegian continental shelf and partially explain the observed high-density rocks occurring below the Møre and Vøring basins and in the Lofoten area.

  19. Lu-Hf garnet geochronology of the Salmon River Suture Zone, West-Central Idaho

    NASA Astrophysics Data System (ADS)

    Wilford, D. E.; Vervoort, J. D.; Lewis, R.; Tikoff, B.

    2011-12-01

    The Salmon River Suture Zone (SRSZ) in west-central Idaho records the accretion of island arc terranes to North America. It is modified by the Western Idaho Shear Zone (WISZ), a high strain zone within the SRSZ, which defines the present-day boundary between old continental North America and the accreted oceanic assemblages. Timing of the onset of deformation on the WISZ is not well established, primarily due to a poorly constrained metamorphic history. Existing garnet geochronologic studies of units within the SRSZ, using the Sm-Nd isotope system, have provided a framework towards a progressive accretion of arc-derived rocks to North America [1,2]. In this study, we report on the application of the Lu-Hf isotope system to provide ages of garnet growth within the suture zone. This system has the advantage of being insensitive to light rare earth element (LREE)-rich inclusions in garnet, which can complicate Sm-Nd geochronology. Samples were taken from several locations from both along and perpendicular to the suture zone. We report results on two of these samples, within and east of the WISZ. First, a garnet bearing leucocratic layer in a gneissic meta-sedimentary screen near Cascade, Idaho, yields a garnet age of 98 ± 2.0 Ma (2SD). The screen occurs completely within the orthogneisses of the WISZ, and displays similar fabrics and kinematics. Second, a biotite quartzo-feldspathic garnet gneiss from Elk City, Idaho, yields an age 100 ± 2.9 Ma (2SD). This location is ~35 km east of the WISZ, on a sub-parallel deformation zone that was active at the same time. Both samples were single-stage garnet fractions consisting of inclusion-free to inclusion-bearing fragments and whole rock pairs. These ages provide two important implications for the Mesozoic evolution of the western edge of North America. First, transpressional deformation in the WISZ occurred simultaneously with deformation on parallel structures in central Idaho, indicating that a wide zone of deformation occurred on North America (and was intruded and thus obscured by the younger Idaho batholith). Second, deformation on these structures occurred during a limited time interval in the mid-Cretaceous, with peak metamorphism at ~100 Ma. [1] Getty et al., 1993, Contrib. Mineral. Petrol, v. 115, p. 45-57. [2] McKay et al., 2011, GSA Abstr w Prog., 2011 Rocky Mountain-Cordilleran section meeting, Paper No. 26-2.

  20. Thin film absorber for a solar collector

    DOEpatents

    Wilhelm, William G. (Cutchogue, NY)

    1985-01-01

    This invention pertains to energy absorbers for solar collectors, and more particularly to high performance thin film absorbers. The solar collectors comprising the absorber of this invention overcome several problems seen in current systems, such as excessive hardware, high cost and unreliability. In the preferred form, the apparatus features a substantially rigid planar frame with a thin film window bonded to one planar side of the frame. An absorber in accordance with the present invention is comprised of two thin film layers that are sealed perimetrically. In a preferred embodiment, thin film layers are formed from a metal/plastic laminate. The layers define a fluid-tight planar envelope of large surface area to volume through which a heat transfer fluid flows. The absorber is bonded to the other planar side of the frame. The thin film construction of the absorber assures substantially full envelope wetting and thus good efficiency. The window and absorber films stress the frame adding to the overall strength of the collector.

  1. Journal of the Geological Society, London, Vol. 1150,1993, pp. 393-404, 15 figs, 2 tables Printed in Northern Ireland Tectonic evolution of the Nakasib suture, Red Sea Hills, Sudan: evidence for a

    E-print Network

    Stern, Robert J.

    of the Arabian-Nubian Shield are welded together. The Nakasib suture separates the 900-850 Ma old Haya terrane. 1987). These terranes are welded together along ophiolite- decorated sutures (Kroner 1985). Suture, in the context of this paper, does not imply the closure of a continent- separating ocean, but is applied

  2. The telescoping suture--Part II: A novel method to improve the mechanical behavior of a new biomaterial: ostrich pericardium.

    PubMed

    García Páez, J M; Jorge Herrero, E; Rocha, A; Martín-Maestro, M; Castillo-Olivares, J L; Millán, I; Carrera Sanmartín, A; Cordón, A

    2002-10-01

    Ostrich pericardium, sutured using a telescoping or overlapping technique, was studied to determine its mechanical behavior. From each of 12 pericardial sacs, four contiguous strips were cut longitudinally, from root to apex, and another four contiguous strips were cut in transverse direction. One of the strips in each set of four was used as an unsutured control and the remaining three were sutured by overlapping 0.5 cm of the tissue and sewing with Gore-tex, Prolene or Pronova. These 96 samples were then subjected to tensile testing along their major axes until rupture. The tensile stresses recorded in the suture materials at the moment tears appeared in the pericardium ranged between 55.99 MPa and 70.23 MPa for Gore-tex in samples cut in the two directions. Shear stress became ostensible at 56 MPa, with clearly evident tears. However, microfracture of the collagen fibers must be produced at much lower stress levels. The comparison of the resistance in kilograms (machine-imposed), without taking into account the sections in which the load was applied, demonstrated only a slight loss of load when the telescoping suture was employed in ostrich pericardium samples. Ostrich pericardium may continue to be an alternative biological material for the construction of heart valve leaflets. PMID:12557997

  3. Evaluation of a suture electrode for direct bladder stimulation in a lower motor neuron lesioned animal model

    Microsoft Academic Search

    James S. Walter; John S. Wheeler; Wuying Cai; William W. King; Robert D. Wurster

    1999-01-01

    The purpose of this study was to evaluate a “suture” type electrode for direct bladder stimulation in an animal model of a lower motor neuron lesion. During an initial surgery, 5 male cats were instrumented under anesthesia using multistranded, 316 LVM, stainless-steel, wire electrodes implanted on the bladder wall serosa above the trigone area. Electrodes were constructed with a needle

  4. Inter-wedging nature of the Cheyenne belt: Archean-Proterozoic suture defined by seismic reflection data

    NASA Astrophysics Data System (ADS)

    Morozova, E. A.; Wan, X.; Chamberlain, K. R.; Smithson, S. B.; Johnson, R.; Karlstrom, K. E.

    New seismic reflection data from the CD-ROM project (Continental Dynamics of the Rocky Mountains) show that the Archean-Proterozoic suture in Wyoming, the Cheyenne belt, consists of a crustal-scale, conjugate thrust wedge, where Archean and Proterozoic crust were thrust into each other. Moderately S-dipping reflections extend to depths of 157-18 km and surface at the mapped shear zones of the Cheyenne belt; these terminate close to a north-dipping reflection that extends to about 24 km depth and converges at the surface at the Farwell-Lester Mountain (FLM) area with several strong, south-dipping reflections. The FLM zone is marked by dismembered ophiolites suggestive of an ocean basin and may represent a back-arc basin subsequently closed by continued south-dipping subduction, resulting in a cryptic suture. Arcuate criss-crossing reflections in Archean basement to the north of the Cheyenne belt are related to folding, inferred conjugate thrusting and an antiformal duplex stack. This stack formed during Paleoproterozoic suturing in supracrustal rocks comprising at least the upper 24 km of the crust. Our analysis of wide-angle seismic data does not reveal a 7 km/s lower crustal layer that could be interpreted as underplate in southern Wyoming or northern Colorado. A suture, marked by complex interwedging of crustal blocks, was probably steepened by continued convergence to the south.

  5. In vivo molecular evaluation of guinea pig skin incisions healing after surgical suture and laser tissue welding using Raman spectroscopy

    Microsoft Academic Search

    A. Alimova; R. Chakraverty; R. Muthukattil; S. Elder; A. Katz; V. Sriramoju; Stanley Lipper; R. R. Alfano

    2009-01-01

    The healing process in guinea pig skin following surgical incisions was evaluated at the molecular level, in vivo, by the use of Raman spectroscopy. After the incisions were closed either by suturing or by laser tissue welding (LTW), differences in the respective Raman spectra were identified. The study determined that the ratio of the Raman peaks of the amide III

  6. Healing and evaluating guinea pig skin incision after surgical suture and laser tissue by welding using in vivo Raman spectroscopy

    Microsoft Academic Search

    A. Alimova; V. Sriramoju; R. Chakraverty; R. Muthukattil; R. R. Alfano

    2010-01-01

    Changes in collagen in the wound during the healing process of guinea pig skin following surgical incisions and LTW was evaluated using in vivo, using Raman spectroscopy. Raman spectroscopy provided information regarding the internal structure of the proteins. After the incisions were closed either by suturing or by LTW the ratio of the Raman peaks of the amide III (1247

  7. Constraining the location of the Archean--Proterozoic suture in the Great Basin based on magnetotelluric soundings

    USGS Publications Warehouse

    Rodriguez, Brian D.; Sampson, Jay A.

    2012-01-01

    It is important to understand whether major mining districts in north-central Nevada are underlain by Archean crust, known to contain major orogenic gold deposits, or, alternatively, by accreted crust of the Paleoproterozoic Mojave province. Determining the location and orientation of the Archean-Proterozoic suture zone between the Archean crust and Mojave province is also critical because it may influence subsequent patterns of sedimentation, deformation, magmatism, and hydrothermal activity. In the Great Basin, the attitude of the suture zone is unknown because it is concealed below cover. A regional magnetotelluric sounding profile along the Utah-Nevada State line reveals a deeply penetrating, broad electrical conductor that may be the Archean-Proterozoic suture zone in the northwest corner of Utah. This major crustal conductor's strike direction is northwest, where it broadens to about 80 km wide below about 3-km depth. These results suggest that the southwestern limit of intact Archean crust in this part of the Great Basin is farther north than previously reported. These results also suggest that the major gold belts in north-central Nevada are located over the Paleoproterozoic Mojave province, and the Archean terrain lies northeast in the northwest corner of Utah. Rifted Archean crust segments south and west of the suture suggest that future mineral exploration northeast of current mineral trends may yield additional gold deposits.

  8. Evolution of the MongolOkhotsk Ocean as constrained by new palaeomagnetic data from the MongolOkhotsk suture zone,

    E-print Network

    Cogne, Jean-Pascal

    , and Mikhail I. Kuzmin 1 East-Siberian Research Institute of Geology, Geophysics and Mineral Resources, Irkutsk 664007, Russia 2 Institute of Geochemistry, Siberian Branch of Russian Academy of Science, Irkutsk 664033 geological units from the Siberian platform and the Mongol­Okhotsk suture zone. Within the southern portion

  9. New constraints on the India–Asia collision: the Lower Miocene Gangrinboche conglomerates, Yarlung Tsangpo suture zone, SE Tibet

    Microsoft Academic Search

    Jonathan C. Aitchison; Aileen M. Davis; Badengzhu; Hui Luo

    2002-01-01

    Lower Miocene conglomerates crop out along the length of the Yarlung Tsangpo suture zone on the southern margin of the Lhasa terrane. These conglomerates, known by various local names, are correlated herein as the Gangrinboche conglomerates. All units exhibit broadly similar stratigraphic histories and a basal depositional contact upon an eroded surface of rocks of the Lhasa terrane is ubiquitous.

  10. A thermally tunable terahertz metamaterial absorber

    NASA Astrophysics Data System (ADS)

    Zheng, Wei; Li, Wei; Chang, Sheng-jiang

    2015-01-01

    A thermally tunable terahertz metamaterial absorber (MA) with InSb embedded in a metal-dielectric-metal structure is proposed. The transmission and tuning properties of the proposed metamaterial absorber are analyzed for the temperature ranging from 160 K to 350 K. The simulated results show that the maximum absorption of the absorber is nearly 99.8% at a full-width at half-maximum (FWHM) of 38 GHz, and the absorption frequency can be dynamically tuned from 0.82 THz to 1.02 THz.

  11. Microwave diode switchable metamaterial reflector/absorber

    NASA Astrophysics Data System (ADS)

    Xu, Wangren; Sonkusale, Sameer

    2013-07-01

    We embed diodes as active circuit elements within a metamaterial to implement a switchable metamaterial reflector/absorber at microwave frequencies. Diodes are placed in series with the unit cells of the metamaterial array. This results in just a pair of control lines to actively tune all the diodes in a metamaterial. Diodes can be tuned on and off to switch the function of the metamaterial between a perfect absorber and a reflector. The design, simulation, and experimental results of a switchable reflector/absorber in 2-6 GHz range are presented.

  12. The Grenville orogenic cycle of southern Laurentia: Unraveling sutures, rifts, and shear zones as potential piercing points for Amazonia

    NASA Astrophysics Data System (ADS)

    Bartholomew, Mervin J.; Hatcher, Robert D., Jr.

    2010-01-01

    The magnetic anomaly map of North America serves as a useful base from which to attempt palinspastic reconstruction of terranes accreted during the Elzevirian orogeny (1250-1200 Ma); the Shawinigan (1200-1150 Ma), Ottawan (1080-1020 Ma), and Rigolet (1020-1000 Ma) phases of the Grenvillian orogeny; and post-Grenvillian magmatism (760-600 Ma) and deformation prior to Iapetan rifting at 565 Ma. Accreted terranes had unique histories prior to amalgamation and share common tectonic events afterwards. Comparisons with magnetic signatures of the Paleozoic craton-craton suture, sutures of accreted terranes, and the Jurassic rifted-margin for the southern-central Appalachians provide a basis for discriminating among alternative Grenvillian sutures beneath the Appalachian orogen. The Elzevirian suture is partially preserved beneath the Appalachians where it separates the Reading Prong terrane from Laurentia (i.e., Adirondacks and composite-arc terrane and Canadian Grenville Province). The Shawinigan suture is partially preserved in the Llano area (Texas), but separated the now-fragmented and allochthonous Amazonian (as indicated from Pb-isotope data) blocks of the outboard Blue Ridge terrane from the Reading Prong terrane in the Appalachians. Isolated blocks of the Sauratown Mountains terrane are interpreted as outboard of the Blue Ridge terrane, but were also accreted during the Shawinigan phase. Within present-day Laurentia, the only fragment of a terrane believed to have been accreted during the main Ottawan phase is the Mars Hill terrane (North Carolina-Tennessee). This suggests that the outboard Ottawan suture may have served as the locus of Iapetan rifting along much of Laurentia. The Rigolet phase (1020-1000 Ma) is characterized by widespread "Basin and Range" type extension (NW-SE) associated with sinistral or dextral movement on the NY-AL lineament, mobilization of core-complexes (Adirondack Highlands), and AMCG magmatism along the outboard flank of the extensional region. Following the Rigolet phase, the Appalachian region continued to be characterized by NW-SE extension during the passage of a possible hotspot along a NE-track (760-600 Ma) across the Blue Ridge and other terranes, and during initial Iapetan rifting (565 Ma). The palinspastic rifted-margin of Laurentia crosses many of these terranes and sutures as well as the possible region of Rigolet extension and the possible hotspot track, thus providing many potential piercing points within the Grenville orogen for comparison with Paleozoic terranes like the Precordillera in South America.

  13. Reduction of suture associated inflammation after 28 days using novel biocompatible pseudoprotein poly(ester amide) biomaterials.

    PubMed

    Hernandez, Karina A; Hooper, Rachel Campbell; Boyko, Tatiana; Golas, Alyssa R; van Harten, Michel; Wu, D Q; Weinstein, Andrew; Chu, C C; Spector, Jason A

    2015-02-01

    Sutures elicit an inflammatory response, which may impede the healing process and result in wound complications. We recently reported a novel family of biocompatible, biodegradable polymers, amino acid-based poly(ester amide)s (AA-PEA), which we have shown to significantly attenuate the foreign body inflammatory response in vitro. Two types of AA-PEA (Phe-PEA and Arg-Phe-PEA) were used to coat silk or plain-gut sutures, which were implanted in the gluteus muscle of C57BL/6 mice, while the uncoated control sutures were implanted in the contralateral side. After 3, 7, 14, and 28 days the mean area of inflammation surrounding the sutures was compared. Phe-PEA coating of silk sutures significantly decreased inflammation compared with noncoated controls (67.8?±?17.4% after 3d [p?=?0.0014], 51.6?±?7.2% after 7d [p?sutures were similarly assessed and demonstrated a significant decrease in the mean area of inflammation across all time points (54.1?±?8.3% after 3 d, 41.4?±?3.9% after 7 d, 71.5?±?8.1% after 14 d, 78.4?±?8.5%, and after 28 d [all p?sutures in vivo for up to 28 days. PMID:24916020

  14. Autosomal dominant zonular cataract with sutural opacities localized to chromosome 17q11-12

    SciTech Connect

    Padma, T.; Ayyagari, R.; Murty, J.S. [and others

    1995-10-01

    Congenital cataracts constitute a morphologically and genetically heterogeneous group of diseases that are a major cause of childhood blindness. Different loci for hereditary congenital cataracts have been mapped to chromosomes 1, 2, 16, and 17q24. We report linkage of a gene causing a unique form of autosomal dominant zonular cataracts with Y-sutural opacities to chromosome 17q11-12 in a three-generation family exhibiting a maximum lod score of 3.9 at D17S805. Multipoint analysis gave a Mod confidence interval of 17 cM. This interval is bounded by the markers D17S799 and D17S798, a region that would encompass a number of candidate genes including that coding for {Beta}A3/A1-crystallin. 30 refs., 2 figs., 1 tab.

  15. Partial-thickness articular surface supraspinatus tears: a new transtendon suture technique.

    PubMed

    Waibl, Bernhard; Buess, Eduard

    2005-03-01

    The standard technique for repairing partial-thickness tears of the supraspinatus tendon includes completion of the lesion to a full-thickness tear. Partial articular-side supraspinatus tendon avulsions (PASTA) form a subgroup deserving special consideration. We present a transtendon suture technique that is able to preserve the intact tendon fibers and to achieve firm attachment of the tendon to the humeral footprint using 1 double-loaded bone anchor. The surgical technique is described in detail, and pitfalls and complications are noted. The clinical results of the first 22 consecutive patients are reported, showing an increase in the UCLA score from 17.1 to 31.2 points and a patient satisfaction rate of 91%. PMID:15756195

  16. Lower Lip Suspension With Gore-Tex Suture: Technique and Literature Review

    PubMed Central

    Davis, Jared; Zeiderman, Matthew; Kelishadi, Sharooz Sean; Wilhelmi, Bradon

    2014-01-01

    Objective: Oral incompetence is a problem frequently experienced after free-flap reconstruction of the oral cavity for patients with oral carcinoma. We describe an interesting treatment modality to deal with this pathology. Methods: A 60-year-old woman diagnosed with squamous cell carcinoma of her oral floor was treated with chemoradiation with complete response, and after suffering recurrence underwent composite mandibulectomy via visor flap and immediate fibular free flap reconstruction. Postoperatively, she was treated with adjuvant chemoradiation and developed oral incompetence months afterward. We performed lower lip suspension with Gore-Tex (Gore – Flagstaff, Arizona) suture with good functional and aesthetic outcome. Results: As of 9 months postoperatively, oral competence was achieved with good functional and aesthetic outcome. Conclusions: This approach is a viable, simple means of restoring oral competence secondary to loss of static control of the lower lip. PMID:25328570

  17. Paediatric tonsillectomy: radiofrequency-based plasma dissection compared to cold dissection with sutures

    PubMed Central

    Di Rienzo Businco, L; Coen Tirelli, G

    2008-01-01

    Summary Aim of this study was to compare post-operative recovery over 14 days in children submitted to tonsillectomy using a bipolar radiofrequency-based plasma device (Coblation®, Evac 70, ArthroCare Corp, Sunnyvale, CA, USA) to cold dissection. Paediatric patients (n = 42) aged 5-16 years old with chronic tonsillitis underwent tonsillectomy using cold dissection with suture ligatures or a plasma device (Evac 70, ArthroCare Corp, Sunnyvale, CA, USA). Pain intensity on the first day, use of analgesics, type of diet, and days of pain, fever, nausea, and absence from school were determined. Groups were compared using time-to-event (Kaplan-Meier) curves and statistically evaluated using the Breslow (generalized Wilcoxon) test. Children undergoing plasma tonsillectomy reported significantly less pain on the first post-operative day (1.2 ± 0.9 vs. 3.5 ± 1.5, p < 0.001), fewer days of pain (4.8 ± 1.5 vs. 9.4 ± 1.2, p < 0.001), pain medication withdrawal (2.6 ± 1.3 vs. 4.5 ± 1.3, p < 0.001) and earlier use of liquid diet (5.1 ± 1.4 vs. 8.5 ± 2.1, p < 0.001), and fewer school days lost (5.3 ± 1.7 vs. 8.9 ± 1.5, p < 0.001). After completing this study, plasma tonsillectomy was adopted for the majority of cases. Benefits of the plasma device include the possibility both to excise tissue and coagulate bleeding vessels using the same device whilst improving quality of post-operative recovery over cold dissection with suture ligatures. PMID:18669070

  18. Paediatric tonsillectomy: radiofrequency-based plasma dissection compared to cold dissection with sutures.

    PubMed

    Di Rienzo Businco, L; Coen Tirelli, G

    2008-04-01

    Aim of this study was to compare post-operative recovery over 14 days in children submitted to tonsillectomy using a bipolar radiofrequency-based plasma device (Coblation, Evac 70, ArthroCare Corp, Sunnyvale, CA, USA) to cold dissection. Paediatric patients (n = 42) aged 5-16 years old with chronic tonsillitis underwent tonsillectomy using cold dissection with suture ligatures or a plasma device (Evac 70, ArthroCare Corp, Sunnyvale, CA, USA). Pain intensity on the first day, use of analgesics, type of diet, and days of pain, fever, nausea, and absence from school were determined. Groups were compared using time-to-event (Kaplan-Meier) curves and statistically evaluated using the Breslow (generalized Wilcoxon) test. Children undergoing plasma tonsillectomy reported significantly less pain on the first post-operative day (1.2 +/- 0.9 vs. 3.5 +/- 1.5, p < 0.001), fewer days of pain (4.8 +/- 1.5 vs. 9.4 +/- 1.2, p <0.001), pain medication withdrawal (2.6 +/- 1.3 vs. 4.5 +/- 1.3, p <0.001) and earlier use of liquid diet (5.1 +/- 1.4 vs. 8.5 +/- 2.1, p <0.001), and fewer school days lost (5.3 +/- 1.7 vs. 8.9 +/- 1.5, p <0.001). After completing this study, plasma tonsillectomy was adopted for the majority of cases. Benefits of the plasma device include the possibility both to excise tissue and coagulate bleeding vessels using the same device whilst improving quality of post-operative recovery over cold dissection with suture ligatures. PMID:18669070

  19. New seismic images of the Central Indian Suture Zone and their tectonic implications

    NASA Astrophysics Data System (ADS)

    Mandal, Biswajit; Sen, Mrinal K.; Vijaya Rao, V.

    2013-07-01

    The Central Indian Suture (CIS), a mega shear zone, located in the central part of the Indian shield exhibits a complex structure with compositional heterogeneity. Multifold deep seismic reflection data acquired across the shear zone have been previously processed using the conventional common midpoint (CMP) method. In this study, we show results from imaging this shear zone using the common reflection surface (CRS) stack method, an alternative to the CMP stack. Our new images reveal geological features that are either poorly resolved or entirely absent in the earlier CMP stack section. Our major findings include a well-imaged Moho throughout the study area, existence of different crustal blocks each with distinct dipping reflection fabrics on the northern and southern sides of the CIS, a well-defined 8 km of Moho offset beneath the CIS, and a high-amplitude reflective zone representing the CIS. The Moho located at a depth of 48 km in the Bastar craton, to the south of the CIS, is also clearly resolved in our CRS stack, as well as in the time-migrated section. A deeply penetrating crustal-scale imbricated structure imaged up to a depth of 16.0 s two-way time (TWT), to the south of the CIS, suggests that the Bastar craton is subducting toward north. An oppositely dipping reflection fabric, a Moho offset, a positive-negative gravity anomaly pair, and the geological data indicate that the CIS represents a collision zone developed due to the interaction of the Bastar and Bundelkhand cratons with the evolution of the Sausar orogeny at ~1000 Ma. This orogeny is contemporaneous with the Grenvillian orogeny and Rodinia assembly. Another thrust fault extending from 4 to 14 s TWT observed to the north of the CIS may represent the earlier, pre-Sausar orogenic activity at 1.6-1.5 Ga. The available seismic characteristics suggest that the CIS, the collisional suture, is also likely to represent a strike-slip fault.

  20. Collision tectonics of the Central Indian Suture zone as inferred from a deep seismic sounding study

    USGS Publications Warehouse

    Mall, D.M.; Reddy, P.R.; Mooney, W.D.

    2008-01-01

    The Central Indian Suture (CIS) is a mega-shear zone extending for hundreds of kilometers across central India. Reprocessing of deep seismic reflection data acquired across the CIS was carried out using workstation-based commercial software. The data distinctly indicate different reflectivity characteristics northwest and southeast of the CIS. Reflections northwest of the CIS predominantly dip southward, while the reflection horizons southeast of the CIS dip northward. We interpret these two adjacent seismic fabric domains, dipping towards each other, to represent a suture between two crustal blocks. The CIS itself is not imaged as a sharp boundary, probably due to the disturbed character of the crust in a 20 to 30-km-wide zone. The time sections also show the presence of strong bands of reflectors covering the entire crustal column in the first 65??km of the northwestern portion of the profile. These reflections predominantly dip northward creating a domal structure with the apex around 30??km northwest of the CIS. There are a very few reflections in the upper 2-2.5??s two-way time (TWT), but the reflectivity is good below 2.5??s TWT. The reflection Moho, taken as the depth to the deepest set of reflections, varies in depth from 41 to 46??km and is imaged sporadically across the profile with the largest amplitude occurring in the northwest. We interpret these data as recording the presence of a mid-Proterozoic collision between two micro-continents, with the Satpura Mobile Belt being thrust over the Bastar craton. ?? 2008.

  1. Microbiopsy engineered for minimally invasive and suture-free sub-millimetre skin sampling.

    PubMed

    Lin, Lynlee L; Prow, Tarl W; Raphael, Anthony P; Harrold Iii, Robert L; Primiero, Clare A; Ansaldo, Alexander B; Soyer, H Peter

    2013-01-01

    We describe the development of a sub-millimetre skin punch biopsy device for minimally invasive and suture-free skin sampling for molecular diagnosis and research. Conventional skin punch biopsies range from 2-4 mm in diameter. Local anaesthesia is required and sutures are usually used to close the wound. Our microbiopsy is 0.50 mm wide and 0.20 mm thick. The microbiopsy device is fabricated from three stacked medical grade stainless steel plates tapered to a point and contains a chamber within the centre plate to collect the skin sample. We observed that the application of this device resulted in a 0.21 ± 0.04 mm wide puncture site in volunteer skin using reflectance confocal microscopy. Histological sections from microbiopsied skin revealed 0.22 ± 0.12 mm wide and 0.26 ± 0.09 mm deep puncture sites. Longitudinal observation in microbiopsied volunteers showed that the wound closed within 1 day and was not visible after 7 days. Reflectance confocal microscope images from these same sites showed the formation of a tiny crust that resolved by 3 weeks and was completely undetectable by the naked eye. The design parameters of the device were optimised for molecular analysis using sampled DNA mass as the primary end point in volunteer studies. Finally, total RNA was characterized. The optimised device extracted 5.9 ± 3.4 ng DNA and 9.0 ± 10.1 ng RNA. We foresee that minimally invasive molecular sampling will play an increasingly significant role in diagnostic dermatology and skin research. PMID:24627782

  2. Petrochemical study of post-Triassic basalts from the Nan Suture, northern Thailand

    NASA Astrophysics Data System (ADS)

    Panjasawatwong, Y.; Yaowanoiyothin, W.

    Mafic-ultramafic rocks along the Nan Suture, a continental suture between Shan-Thai and Indo-China cratons, include ocean-island basalts, backarc basin basalts and andesites, island-arc basalts and andesites, supra-subduction cumulates, and continental intraplate basalts. The first four compositional groups formed in the Carboniferous to Permo-Triassic, prior to the Late Triassic continental collision, whereas the other erupted in post-Triassic time, possibly the Cenozoic. The post-Triassic lavas form a discontinuous narrow belt, disconformably overlying metagabbros/amphibolites and serpentinite melange. They are much less deformed and altered relative to the older rocks. The post-Triassic lavas are evolved mildly alkalic rocks, characterized by SiO2 = 51.2-58.0 wt%, MgO = 3.4-6.3 wt%, Nb/Y = 0.8-1.0 , Ti/V > 50, ( La/Yb) n = 7.4-11.6 , and FeO, TiO 2 and V depletion with progressive fractionation. They may be classified as hawaiite, mugearite and benmoreite with Na2O/K2O = 1.8-2.4 . They are phyric with olivine (Fo 68.0-83.6), calcic clinopyroxene ( mg# = 0.70-0.86 , plagioclase, magnetite and ilmenite phenocrysts and microphenocrysts embedded in fine-grained matrix made up mainly of plagioclase, clinopyroxene and olivine. Orthopyroxene ( mg# = 0.65-0.70) occurs as an additional microphenocryst phase in the highly evolved samples. These basalts are chemically broadly comparable with alkalic basalts such as those erupted in the postshield stages of Haleakala in the Hawaiian chain, and are interpreted to have erupted in continental environment as the Late Cenozoic basalts in mainland SE Asia.

  3. 40Ar/ 39Ar mineral age constraints for the tectonothermal evolution of a Variscan suture in southwest Iberia

    NASA Astrophysics Data System (ADS)

    Dallmeyer, R. D.; Fonseca, P. E.; Quesada, C.; Ribeiro, A.

    1993-06-01

    Dallmeyer, R.D., Fonseca, P.E., Quesada, C. and Ribeiro, A., 1993. 40Ar/ 39Ar mineral age constraints for the tectonothermal evolution of a Variscan suture in southwest Iberia. Tectonophysics, 222: 177-194. Mafic units interpreted to represent an internally disrupted ophiolite succession are exposed along a Variscan suture situated between the South Portuguese and Ossa-Morena zones in southern Iberia. Structural characteristics of various units adjacent to the suture zone suggest maintainence of an oblique (transpressional), sinistral tectonic regime during late Paleozoic plate convergence. This involved initial, limited, north-directed subduction beneath the Ossa-Morena zone, and was followed by oblique collision of the South Portuguese Terrane. Metamorphic evolution of rocks adjacent to the suture occurred during maintainence of a moderately high geothermal regime. Five samples of amphibolite were collected within the hanging wall of the suture. These included samples from the ophiolitic terrane and from the Ossa-Morena zone. Two samples were also collected within the post-kinematic Beja Gabbro which intruded the other two tectonic units following their structural juxtaposition and penetrative ductile deformation. Hornblende concentrates from these seven samples record well-defined 40Ar/ 39Ar plateau ages which range between c. 342 and 335 Ma. These results imply that the regional tectonostratigraphic units were maintained at moderate crustal levels until the Visean, and that their juxtaposition and internal ductile deformation occurred in the late Devonian. Subsequent cooling was probably effected by transpressional uplift during oblique collision following closure of intervening oceanic elements.

  4. Video-Based Skill Assessment of Endoscopic Suturing in a Pediatric Chest Model and a Box Trainer.

    PubMed

    Takazawa, Shinya; Ishimaru, Tetsuya; Harada, Kanako; Tsukuda, Yusuke; Sugita, Naohiko; Mitsuishi, Mamoru; Iwanaka, Tadashi

    2014-11-25

    Abstract Purpose: Pediatric endoscopic surgery requires special surgical skills because of the small working space and tissue fragility. This article presents a video-based skill assessment method for endoscopic suturing using a pediatric chest model. Materials and Methods: A commercial suture pad was placed in a rapid-prototyped pediatric chest model of a 1-year-old patient to simulate the thoracoscopic repair of esophageal atresia type C. Twenty-eight pediatric surgeons (9 experts, 9 intermediates, and 10 trainees) performed an endoscopic intracorporeal suturing and knot-tying task both in the pediatric chest model and in a box trainer. The tasks were video-recorded and rated by two blinded observers using the 29-point checklist method and a suturing errors score sheet method. The task completion time and the number of needle manipulations were measured. Results: The expert group showed better performance than the intermediate and trainee groups in the pediatric chest model, and the differences were larger than those in the box trainer. Significant differences between the expert and the trainee groups were observed in the items related to safety such as the skills for keeping the needle in view at all times. Significant differences between the expert and intermediate groups were observed in the items related to task quality and efficiency such as the smoothness of knot tying and the number of needle manipulations. Conclusions: Video-based skill assessment of endoscopic suturing using the pediatric chest model and a box trainer distinguished pediatric endoscopic surgeons according to their clinical experience, and pediatric-specific skills were identified. PMID:25423170

  5. Density of the midpalatal suture after RME treatment – a retrospective comparative low-dose CT-study

    PubMed Central

    2014-01-01

    Introduction Rapid maxillary expansion (RME) is a common technique to improve the dental and skeletal transverse width in cases of constricted maxillary arches. Although retention after RME has been widely examined, there is still no clear statement about the minimal retention time in postpubertal patients and many practitioners have retention concepts varying between three and six months. Methods This retrospective study consisted of 14 patients who were either treated with a Haas-type RME (6 patients) or a Hybrid-RME (8 patients). The average age was 15.8 years (min. 13.5 years, max. 23.0 years). Low-dose CT scans were taken initially before placement of the RME (T0), directly after maximal activation (T1) and (in six cases) also in retention after 6 months (T2). Using a 3D-software (“OnDemand3D”/Cybermed Inc.) in analogy to the method published by Franchi et al. (AJODO Volume 137/ Number 4) all values were measured twice at an interval of 1 month to assess the method error and the intraoperator reliability. Statistical analysis was performed using SPSS 21 for Mac. Possible influences of the RME-type were assessed using the univariate ANOVA. Changes in the sutural density between the different points of time were examined using paired t-tests. Results The density of the suture decreased significantly after expansion (T0-T1) with both types of RME (p?=?0.000). In the retention period there was a significant increase of the sutural density (p?=?0.007) although it did not achieve the initial level (p?=?0.002). Conclusions 1. The midpalatal suture was opened in all analysed patients. 2. In postpubertal patients a retention time of six months does not allow sufficient reorganization of the suture. 3. Therefore, a retention period longer than six months seems to be beneficial to prevent relapses in postpubertal patients. PMID:24884771

  6. Energy absorber uses expanded coiled tube

    NASA Technical Reports Server (NTRS)

    Johnson, E. F.

    1972-01-01

    Mechanical shock mitigating device, based on working material to its failure point, absorbs mechanical energy by bending or twisting tubing. It functions under axial or tangential loading, has no rebound, is area independent, and is easy and inexpensive to build.

  7. Durability of Polymeric Glazing and Absorber Materials

    SciTech Connect

    Jorgensen, G.; Terwilliger, K.; Bingham, C.; Milbourne, M.

    2005-01-01

    The Solar Heating and Lighting Program has set the goal of reducing the cost of solar water heating systems by at least 50%. An attractive approach to such large cost reduction is to replace glass and metal parts with less-expensive, lighter-weight, more-integrated polymeric components. The key challenge with polymers is to maintain performance and assure requisite durability for extended lifetimes. The objective of this task is to quantify lifetimes through measurement of the optical and mechanical stability of candidate polymeric glazing and absorber materials. Polycarbonate sheet glazings, as proposed by two industry partners, have been tested for resistance to UV radiation with three complementary methods. Incorporation of a specific 2-mil thick UV-absorbing screening layer results in glazing lifetimes of at least 15 years; improved screens promise even longer lifetimes. Proposed absorber materials were tested for creep and embrittlement under high temperature, and appear adequate for planned ICS absorbers.

  8. Efficient waveform recall in absorbing media

    Microsoft Academic Search

    C. S. Cornish; M. Azadeh; W. R. Babbitt; L. Tsang

    1998-01-01

    Summary form only given. We have shown that efficient recall of temporally structured optical pulses in absorbing media can be obtained via the photon echo process if the absorption length and pulse area of brief pulses are appropriately chosen

  9. Neutron absorbing coating for nuclear criticality control

    DOEpatents

    Mizia, Ronald E. (Idaho Falls, ID); Wright, Richard N. (Idaho Falls, ID); Swank, William D. (Idaho Falls, ID); Lister, Tedd E. (Idaho Falls, ID); Pinhero, Patrick J. (Idaho Falls, ID)

    2007-10-23

    A neutron absorbing coating for use on a substrate, and which provides nuclear criticality control is described and which includes a nickel, chromium, molybdenum, and gadolinium alloy having less than about 5% boron, by weight.

  10. Unity absorbance layers - optimal design criteria

    E-print Network

    Chalapat, K; Du, Z; Tervo, J; Nefedov, I; Tretyakov, S

    2011-01-01

    We present the necessary and sufficient conditions for the unity absorbance of thin planar layers. With a simple structure comprising a double-layer grid, it is shown that zero transmission and reflection is feasible only if the second sheet is a perfectly conducting wall. The operational frequencies can be varied by tuning the grid impedance. Explicit conditions are given at the large wavelength limit; these underline the fundamental of ultra-thin perfect antennae and absorbers.

  11. A planar polarization-insensitive metamaterial absorber

    Microsoft Academic Search

    Yongzhi Cheng; Helin Yang; Zhengze Cheng; Boxun Xiao

    2011-01-01

    The model of the polarization-insensitive metamaterial (MM) absorber composed of split cross-ring resonator (SCRR), cave-cross resonator (CCR) and dielectric substrate was proposed at microwave frequencies. Based on perfect impedance-matched (z˜(?)=1) to the free space, the single unit cell could achieve near-unity absorbance by properly assembling the sandwich structure. We have simulated and measured the reflectivity and transmission properties of a

  12. 21 CFR 886.3300 - Absorbable implant (scleral buckling method).

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ...2011-04-01 false Absorbable implant (scleral buckling method...DEVICES OPHTHALMIC DEVICES Prosthetic Devices § 886.3300 Absorbable implant (scleral buckling method...Identification. An absorbable implant (scleral buckling...

  13. 21 CFR 886.3300 - Absorbable implant (scleral buckling method).

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...2012-04-01 false Absorbable implant (scleral buckling method...DEVICES OPHTHALMIC DEVICES Prosthetic Devices § 886.3300 Absorbable implant (scleral buckling method...Identification. An absorbable implant (scleral buckling...

  14. 21 CFR 886.3300 - Absorbable implant (scleral buckling method).

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...2013-04-01 false Absorbable implant (scleral buckling method...DEVICES OPHTHALMIC DEVICES Prosthetic Devices § 886.3300 Absorbable implant (scleral buckling method...Identification. An absorbable implant (scleral buckling...

  15. 21 CFR 886.3300 - Absorbable implant (scleral buckling method).

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...2014-04-01 false Absorbable implant (scleral buckling method...DEVICES OPHTHALMIC DEVICES Prosthetic Devices § 886.3300 Absorbable implant (scleral buckling method...Identification. An absorbable implant (scleral buckling...

  16. 21 CFR 880.5300 - Medical absorbent fiber.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...2010-04-01 false Medical absorbent fiber. 880.5300 Section 880.5300 Food...Devices § 880.5300 Medical absorbent fiber. (a) Identification. A medical absorbent fiber is a device intended for medical...

  17. 21 CFR 868.5310 - Carbon dioxide absorber.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...2012-04-01 2012-04-01 false Carbon dioxide absorber. 868.5310 Section...DEVICES Therapeutic Devices § 868.5310 Carbon dioxide absorber. (a) Identification. A carbon dioxide absorber is a device that is...

  18. 21 CFR 868.5310 - Carbon dioxide absorber.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...2010-04-01 2010-04-01 false Carbon dioxide absorber. 868.5310 Section...DEVICES Therapeutic Devices § 868.5310 Carbon dioxide absorber. (a) Identification. A carbon dioxide absorber is a device that is...

  19. 21 CFR 868.5300 - Carbon dioxide absorbent.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...2010-04-01 2010-04-01 false Carbon dioxide absorbent. 868.5300 Section...DEVICES Therapeutic Devices § 868.5300 Carbon dioxide absorbent. (a) Identification. A carbon dioxide absorbent is a device...

  20. 21 CFR 868.5300 - Carbon dioxide absorbent.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ...2011-04-01 2011-04-01 false Carbon dioxide absorbent. 868.5300 Section...DEVICES Therapeutic Devices § 868.5300 Carbon dioxide absorbent. (a) Identification. A carbon dioxide absorbent is a device...

  1. 21 CFR 868.5310 - Carbon dioxide absorber.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ...2011-04-01 2011-04-01 false Carbon dioxide absorber. 868.5310 Section...DEVICES Therapeutic Devices § 868.5310 Carbon dioxide absorber. (a) Identification. A carbon dioxide absorber is a device that is...

  2. Perfect terahertz absorber using fishnet based metafilm

    SciTech Connect

    Azad, Abul Kalam [Los Alamos National Laboratory; Shchegolkov, Dmitry Yu [Los Alamos National Laboratory; Chen, Houtong [Los Alamos National Laboratory; Taylor, Antoinette [Los Alamos National Laboratory; Smirnova, E I [Los Alamos National Laboratory; O' Hara, John F [Los Alamos National Laboratory

    2009-01-01

    We present a perfect terahertz (THz) absorber working for a broad-angle of incidence. The two fold symmetry of rectangular fishnet structure allows either complete absorption or mirror like reflection depending on the polarization of incident the THz beam. Metamaterials enable the ability to control the electromagnetic wave in a unique fashion by designing the permittivity or permeability of composite materials with desired values. Although the initial idea of metamaterials was to obtain a negative index medium, however, the evolution of metamaterials (MMs) offers a variety of practically applicable devices for controlling electromagnetic wave such as tunable filters, modulators, phase shifters, compact antenna, absorbers, etc. Terahertz regime, a crucial domain of the electromagnetic wave, is suffering from the scarcity of the efficient devices and might take the advantage of metamaterials. Here, we demonstrate design, fabrication, and characterization of a terahertz absorber based on a simple fishnet metallic film separated from a ground mirror plane by a dielectric spacer. Such absorbers are in particular important for bolometric terahertz detectors, high sensitivity imaging, and terahertz anechoic chambers. Recently, split-ring-resonators (SRR) have been employed for metamaterial-based absorbers at microwave and THz frequencies. The experimental demonstration reveals that such absorbers have absorptivity close to unity at resonance frequencies. However, the downside of these designs is that they all employ resonators of rather complicated shape with many fine parts and so they are not easy to fabricate and are sensitive to distortions.

  3. Method of absorbance correction in a spectroscopic heating value sensor

    DOEpatents

    Saveliev, Alexei; Jangale, Vilas Vyankatrao; Zelepouga, Sergeui; Pratapas, John

    2013-09-17

    A method and apparatus for absorbance correction in a spectroscopic heating value sensor in which a reference light intensity measurement is made on a non-absorbing reference fluid, a light intensity measurement is made on a sample fluid, and a measured light absorbance of the sample fluid is determined. A corrective light intensity measurement at a non-absorbing wavelength of the sample fluid is made on the sample fluid from which an absorbance correction factor is determined. The absorbance correction factor is then applied to the measured light absorbance of the sample fluid to arrive at a true or accurate absorbance for the sample fluid.

  4. On the definition of absorbed dose

    NASA Astrophysics Data System (ADS)

    Grusell, Erik

    2015-02-01

    Purpose: The quantity absorbed dose is used extensively in all areas concerning the interaction of ionizing radiation with biological organisms, as well as with matter in general. The most recent and authoritative definition of absorbed dose is given by the International Commission on Radiation Units and Measurements (ICRU) in ICRU Report 85. However, that definition is incomplete. The purpose of the present work is to give a rigorous definition of absorbed dose. Methods: Absorbed dose is defined in terms of the random variable specific energy imparted. A random variable is a mathematical function, and it cannot be defined without specifying its domain of definition which is a probability space. This is not done in report 85 by the ICRU, mentioned above. Results: In the present work a definition of a suitable probability space is given, so that a rigorous definition of absorbed dose is possible. This necessarily includes the specification of the experiment which the probability space describes. In this case this is an irradiation, which is specified by the initial particles released and by the material objects which can interact with the radiation. Some consequences are discussed. Specific energy imparted is defined for a volume, and the definition of absorbed dose as a point function involves the specific energy imparted for a small mass contained in a volume surrounding the point. A possible more precise definition of this volume is suggested and discussed. Conclusions: The importance of absorbed dose motivates a proper definition, and one is given in the present work. No rigorous definition has been presented before.

  5. Oxygen absorbers in food preservation: a review.

    PubMed

    Cichello, Simon Angelo

    2015-04-01

    The preservation of packaged food against oxidative degradation is essential to establish and improve food shelf life, customer acceptability, and increase food security. Oxygen absorbers have an important role in the removal of dissolved oxygen, preserving the colour, texture and aroma of different food products, and importantly inhibition of food spoilage microbes. Active packaging technology in food preservation has improved over decades mostly due to the sealing of foods in oxygen impermeable package material and the quality of oxygen absorber. Ferrous iron oxides are the most reliable and commonly used oxygen absorbers within the food industry. Oxygen absorbers have been transformed from sachets of dried iron-powder to simple self-adhesive patches to accommodate any custom size, capacity and application. Oxygen concentration can be effectively lowered to 100 ppm, with applications spanning a wide range of food products and beverages across the world (i.e. bread, meat, fish, fruit, and cheese). Newer molecules that preserve packaged food materials from all forms of degradation are being developed, however oxygen absorbers remain a staple product for the preservation of food and pharmaceutical products to reduce food wastage in developed nations and increased food security in the developing & third world. PMID:25829570

  6. Linking geological evidence from the Eurasian suture zones to a regional Indian Ocean plate tectonic model

    NASA Astrophysics Data System (ADS)

    Gibbons, A.; Aitchison, J.; Müller, R.; Whittaker, J.

    2012-12-01

    We present a revised regional plate tectonic model for the Indian Ocean from the Late Jurassic to present, which assimilates both marine geophysical data constraining the seafloor spreading history as well as a variety of geological observations from the Eurasian collision zone. This model includes relative motion between Greater India, Sri Lanka, West Australia, East Antarctica, East Madagascar, the Seychelles and Argoland, a continental sliver which began migrating towards Eurasia in the Late Jurassic, forming the northern margins of Greater India and western Australia. Recently collected data offshore northwest Australia suggest that the majority of Greater India reached only halfway along the West Australian margin in an Early Mesozoic reconstruction, bounded by the Wallaby-Zenith Fracture Zone. The revised geometries and relative motion histories redefine the timing and nature of collisional events, as well as the history of back-arc basins and intra-oceanic arcs, such as the Kohistan-Ladakh intra-oceanic arc in northwest India and Pakistan. Abundant ophiolites have been identified throughout the Yarlung-Tsangpo Suture Zone, between the Indian-Himalaya and Tibet, several have boninitic compositions and almost all date to either the Mid Jurassic or late Early Cretaceous. Further evidence suggests that an intra-oceanic arc collided with Greater India before colliding with Eurasia. Our model features a transform boundary running north of East Africa, which initiated an oceanic arc following short-lived compression between the western and central Mesotethys in the Late Jurassic, coinciding with the initial motion of Argoland. The arc developed through extension and ophiolite generation until at least the mid-Cretaceous and consumed a narrow thinned sliver of West Argoland between ~120-65 Ma. The arc remained active in the same position until its eventual collision with Greater India ~55 Ma. The eastern portion of the intra-oceanic arc accreted to eastern Eurasia (near Burma) causing anticlockwise rotation/retreat of the margin until collision between the main portion of Greater India and central Eurasian margin took place ~36 Ma. This relatively young collision between India and Eurasia is supported by subduction-related magmatism, which continued into the Late Eocene. The Upper Eocene Pengqu Formation also suggests that marine conditions prevailed south of the suture zone until that time, while the Upper Oligocene to Lower Miocene Gangrinboche conglomerates mark the initial mixing and deposition of both Eurasian and Indian-sourced sediments.

  7. Lamellar corneal transplantation: comparison of a simplified technique utilizing a contact lens splint supported by tissue adhesives with a standard suture graft procedure.

    E-print Network

    Playter, Robert Franklin

    1974-01-01

    to insert, difficult to remove and may subject the eye to considerable trauma, occasionally resulting in a nebulous or macular radiating opacity at the site 1, 5 of insertion. ' During insertion of the sutures the donor graft frequently is exposed...

  8. The Use of CT Scans in Estimating Age at Death by Examining the Extent of Ectocranial Suture Closure.

    PubMed

    Boyd, Kristen Leigh; Villa, Chiara; Lynnerup, Niels

    2015-03-01

    We examined the utility of CT scans in the evaluation of degree of ectocranial suture closure. Five cranial points (left and right midcoronal positions, left and right midlambdoidal positions, and the lambda) were evaluated in 231 CT scans using a three-point scoring system (open, partial closed, and closed). The slice increment and thickness varied between three groups of the scans. The results showed a good correlation between degree of suture closure and increasing age in each group. Young individuals (<40 years) and old individuals (>60 years) could be clearly distinguished from the middle-aged individuals. ANOVA test revealed no difference between two groups of scans and between left and right sides (p > 0.05). Interobserver agreement was good, especially considering the score by sides. The results of this study create the base for developing a robust and simple method to estimate the age at death using CT scans. PMID:25619969

  9. Healing and evaluating guinea pig skin incision after surgical suture and laser tissue by welding using in vivo Raman spectroscopy

    NASA Astrophysics Data System (ADS)

    Alimova, A.; Sriramoju, V.; Chakraverty, R.; Muthukattil, R.; Alfano, R. R.

    2010-02-01

    Changes in collagen in the wound during the healing process of guinea pig skin following surgical incisions and LTW was evaluated using in vivo, using Raman spectroscopy. Raman spectroscopy provided information regarding the internal structure of the proteins. After the incisions were closed either by suturing or by LTW the ratio of the Raman peaks of the amide III (1247 cm-1) band to a peak at 1326 cm-1 used to evaluate the progression of collagen deposition. Histopathology was used as the gold standard. LTW skin demonstrated better healing than sutured skin, exhibiting minimal hyperkeratosis, minimal collagen deposition, near-normal surface contour, and minimal loss of dermal appendages. This work is important to plastic surgery.

  10. A study of the concentration of orally administered sparfloxacin found in exudates from suture wounds beneath occlusive dressings.

    PubMed

    Yotsuyanagi, T; Urushidate, S; Yokoi, K; Sawada, Y; Suno, M; Ohkubo, T

    1998-12-01

    The concentration of orally administered sparfloxacin (SPFX), an antimicrobial agent, in exudates from the suture wounds beneath occlusive dressings has been measured. Twenty-one patients who received oral therapy with 100 mg of SPFX prior to surgery and 200 mg/day of SPFX after surgery were studied. During the operations, the suture wounds were covered by occlusive film. 48h post-operation, wound exudates under the dressings were drawn and measured using high performance liquid chromatography. SPFX values were 0.801+/-0.340 microg/ml (mean+/-SD). The results suggest that wound exudates beneath the occlusive dressing have concentrations of SPFX high enough to prevent infection in most cases when administered orally. PMID:9915677

  11. Translatory shock absorber for attitude sensors

    NASA Technical Reports Server (NTRS)

    Vonpragenau, G. L.; Morgan, I. T., Jr.; Kirby, C. A. (inventors)

    1976-01-01

    A translatory shock absorber is provided for mounting an attitude sensor thereon for isolating a sensor from translatory vibrations. The translatory shock absorber includes a hollow block structure formed as one piece to form a parallelogram. The absorber block structure includes a movable top plate for supporting the attitude sensor and a fixed base plate with opposed side plates interposed between. At the junctions of the side plates, and the base and top plates, there are provided grooves which act as flexible hinges for attenuating translatory vibrations. A damping material is supported on a pedestal which is carried on the base plate between the side plates thereof. The top of the damping material rests against the bottom surface of the top plate for eliminating the resonant peaks of vibration.

  12. Absorber Materials at Room and Cryogenic Temperatures

    SciTech Connect

    F. Marhauser, T.S. Elliott, A.T. Wu, E.P. Chojnacki, E. Savrun

    2011-09-01

    We recently reported on investigations of RF absorber materials at cryogenic temperatures conducted at Jefferson Laboratory (JLab). The work was initiated to find a replacement material for the 2 Kelvin low power waveguide Higher Order Mode (HOM) absorbers employed within the original cavity cryomodules of the Continuous Electron Beam Accelerator Facility (CEBAF). This effort eventually led to suitable candidates as reported in this paper. Furthermore, though constrained by small funds for labor and resources, we have analyzed a variety of lossy ceramic materials, several of which could be usable as HOM absorbers for both normal conducting and superconducting RF structures, e.g. as loads in cavity waveguides and beam tubes either at room or cryogenic temperatures and, depending on cooling measures, low to high operational power levels.

  13. Optical analysis of solar energy tubular absorbers.

    PubMed

    Saltiel, C; Sokolov, M

    1982-11-15

    The energy absorbed by a solar energy tubular receiver element for a single incident ray is derived. Two types of receiver elements were analyzed: (1) an inner tube with an absorbing coating surrounded by a semitransparent cover tube, and (2) a semitransparent inner tube filled with an absorbing fluid surrounded by a semitransparent cover tube. The formation of ray cascades in the semitransparent tubes is considered. A numerical simulation to investigate the influence of the angle of incidence, sizing, thickness, and coefficient of extinction of the tubes was performed. A comparison was made between receiver elements with and without cover tubes. Ray tracing analyses in which rays were followed within the tubular receiver element as well as throughout the rest of the collector were performed for parabolic and circular trough concentrating collectors. PMID:20401004

  14. Ferrite HOM Absorber for the RHIC ERL

    SciTech Connect

    Hahn,H.; Choi, E.M.; Hammons, L.

    2008-10-01

    A superconducting Energy Recovery Linac is under construction at Brookhaven National Laboratory to serve as test bed for RHIC upgrades. The damping of higher-order modes in the superconducting five-cell cavity for the Energy-Recovery linac at RHIC is performed exclusively by two ferrite absorbers. The ferrite properties have been measured in ferrite-loaded pill box cavities resulting in the permeability values given by a first-order Debye model for the tiled absorber structure and an equivalent permeability value for computer simulations with solid ring dampers. Measured and simulated results for the higher-order modes in the prototype copper cavity are discussed. First room-temperature measurements of the finished niobium cavity are presented which confirm the effective damping of higher-order modes in the ERL. by the ferrite absorbers.

  15. Interference theory of metamaterial perfect absorbers

    E-print Network

    Chen, Hou-Tong

    2011-01-01

    The impedance matching in metamaterial perfect absorbers has been believed to involve and rely on magnetic resonant response, with a direct evidence from the anti-parallel directions of surface currents in the metal structures. Here we present a different theoretical interpretation based on interferences, which shows that the two layers of metal structure in metamaterial absorbers are linked only by multiple reflections with negligible near-field interactions or magnetic resonances. This is further supported by the out-of-phase surface currents derived at the interfaces of resonator array and ground plane through multiple reflections and superpositions. The theory developed here explains all features observed in narrowband metamaterial absorbers and therefore provides a profound understanding of the underlying physics.

  16. Traumatic elbow luxation in a free-ranging hedgehog (Erinaceus europaeus): surgical management using circumferential suture prostheses.

    PubMed

    Vallefuoco, Rosario; Pignon, Charly; Furst, Anna; Personne, Lauriane; Courreau, Jean-Francois; Moissonnier, Pierre

    2013-06-01

    A free-ranging adult female hedgehog (Erinaceus europaeus) was presented injured, presumably from vehicular trauma. Clinical and radiographic examination under general anesthesia revealed a lateral elbow luxation. Closed reduction was unsuccessful, so a surgical approach with circumferential suture prostheses was used to stabilize the elbow. Neither perioperative nor postoperative complications were recorded. The hedgehog regained good range of motion of the elbow and was fully able to run and to roll into a ball. PMID:23805574

  17. A comparison of canine prescrotal urethrostomies which heal by second intention and urethrotomies sutured with polyglactin 910 or polydioxanone

    E-print Network

    Weber, William James

    1984-01-01

    Preoperative antibiotics were administered since incisions would be made into the potentially contaminated distal urethra. The antibiotic administration was continued for 7 days following surgery for several reasons. In animals with open urethral incisions... in partial fulfillment of the requirements for the degree MASTER OF SCIENCE May 1984 Major Subject: Veterinary Medicine and Surgery A COMPARISON OF CANINE PRESCROTAL URETHROSTOMIES WHICH HEAL BY SECOND INTENTION AND URETHROTOMIES SUTURED...

  18. Light-emitting diode photobiomodulation: effect on bone formation in orthopedically expanded suture in rats--early bone changes.

    PubMed

    Ekizer, Abdullah; Uysal, Tancan; Güray, Enis; Yüksel, Yasemin

    2013-09-01

    The aim of this experimental study was to evaluate histomorphometrically the effects of light-emitting diode (LED) photobiomodulation therapy (LPT) on bone formation in response to expansion of the interpremaxillary suture in rats. Twenty male, 50- to 60-day-old Wistar rats were divided into two equal groups (control and experimental). Both groups were subjected to expansion for 5 days, and 50 cN of force was applied to the maxillary incisors with helical spring. An OsseoPulse® LED device, 618-nm wavelength and 20-mW/cm(2) output power irradiation, was applied to the interpremaxillary suture for 10 days. Bone formation in the sutural area was histomorphometrically evaluated, including the amount of new bone formation (in square micrometers), number of osteoblasts, number of osteoclasts, and number of vessels. Mann-Whitney U test was used for statistical evaluation at p?suture during expansion and the early phase of the retention periods. PMID:23139069

  19. Efficacy of TachoSil® patches in controlling Dacron suture-hole bleeding after abdominal aortic aneurysm open repair

    Microsoft Academic Search

    Guido Bajardi; Felice Pecoraro; Domenico Mirabella

    2009-01-01

    PURPOSE: The aim of this study is evaluate the efficacy of TachoSil® patches in controlling suture-hole bleeding after elective infrarenal abdominal aortic aneurysm (AAA) replacement with Dacron graft. MATERIALS AND METHODS: Patients undergoing elective replacement of infrarenal AAA with Dacron grafts were prospectively randomized to TachoSil® patches (Group I) or standard compression with surgical swabs (Group II). We evaluated time

  20. Preliminary report: Laser welding and fibrinogen soldering are superior to sutured cholecyctostomy closure in a canine model

    NASA Astrophysics Data System (ADS)

    Oz, Mehmet C.; Treat, Michael R.; Libutti, Steven K.; Popp, Howard W.; Bass, Lawrence S.; Popilskis, Sulli

    1990-06-01

    Percutaneous endoscopic techniques for biliary surgery would be facilitated by methods of welding biliary tissue. To further investigate laser methods for fusing biliary tissue, we compared the time 0 bursting strength of two variations of near-infrared laser closure against polyglycolic acid suture controls. These time 0 studies were performed with a gallium-aluminum-arsenide semiconductor diode laser with a major ,iavelength output of 808 -F 1 nm and an energy density of 4.8 J/cm'. Using the 808 nm laser and indocyanine green dye to enhance laser energy uptake, closure of gallbladder incisions was accomplished with and without addition of fibrinogen to the target site prior to laser exposure. Without fibrinogen, the laser welds burst at 77 mm Hg, while fibrinogen soldering yielded a bursting pressure of 194 mm Hg. Sutured welds leaked at 215 mm Hg. Survival studies were performed with a mid-infrared 2.15 micron thulium-holmium--chromium:YAG laser producing 200 microsecond 300 millijoule pulses at 3 Hz (peak power .75 megawatts/sq cm, fluence 150 joules per square centimeter). The healing of midinfrared and polyglycolic suture closures of gallbladder incisions were compared at 1,2,3, and 4 weeks. All closures healed without evidence of leakage or infection. Laser welded cholecystostomy sites were completely ingrown with fibrous tissue by 2 weeks post- operatively and re-epithelialized by 3 weeks after operation. Suture closed wounds were still without complete epithelization 4 weeks after the procedure. Laser welding, particularly with fibrinogen reinforcement, may be a useful technique in future developments in percutaneous endoscopic biliary surgery.