Sample records for monofilament absorbable suture

  1. Characteristics of novel monofilament sutures prepared by conjugate spinning.

    PubMed

    Im, Jung Nam; Kim, Jeong Kyung; Kim, Hyun-Kyoon; Lee, Kuen Yong; Park, Won Ho

    2007-11-01

    Compared with braided multifilament sutures, absorbable monofilaments are attractive suture materials as they exhibit less tissue drag and cause less tearing because of their smooth surfaces. However, monofilament sutures are less flexible and more difficult to tie a knot than multifilament ones, and their knots are more likely to loosen due to inferior knot security. Although various approaches have been reported to improve the flexibility of monofilament sutures, they still have limitations regarding poor knot security. To address this problem, we developed a novel technique to fabricate monofilament sutures by a conjugate spinning method, resulting in the formation of a sea/islands type of bicomponent monofilament suture. These sea/islands type bicomponent monofilament sutures, which can place many fine strands of a polymeric fiber within a matrix of another polymer, exhibited excellent knot security, flexibility, and low strain energy, compared with commercially available monofilament sutures. PMID:17465022

  2. The role of superoxide ions in the degradation of synthetic absorbable sutures.

    PubMed

    Lee, K H; Chu, C C

    2000-01-01

    The objective of this study was to examine the effect of superoxide ion-induced degradation on synthetic absorbable biomaterials. Synthetic absorbable sutures were used as the model compounds. Inflammatory cells, particularly leukocytes and macrophages, are able to produce highly reactive oxygen species, such as superoxide (. O(2)(-)), during inflammatory reactions to foreign materials. Superoxide ions may act as oxygen nucleophile agents to attack biomaterials. In this study, the changes in tensile breaking force, thermal properties, and the surface morphology of five commercial (2/0 in size) synthetic absorbable sutures (Dexon, Vicryl, PDS II, Maxon, and Monocryl) as a function of superoxide ion concentration at 25 degrees C for 24 h were studied. Among the five absorbable sutures and over the concentration range of this study, the monofilament Monocryl suture was the most sensitive toward superoxide ion-induced degradation, followed by Maxon, Vicryl, Dexon, and PDS II sutures. The amount of tensile breaking force loss over a 24 h period ranged from as low as 3% to as high as 80%, depending on the type of absorbable sutures, the reaction time, and the superoxide ion concentration. All five absorbable sutures showed significant reductions in both the T(m) and T(g). Unlike the surface morphological changes of absorbable sutures in conventional buffer solutions, the effect of superoxide ion-induced degradation on the surface morphologies of these five absorbable sutures was unique, particularly the moon-crater-shaped impressions of various sizes and depths found in Monocryl and Maxon sutures, which defied the anisotropic characteristics of fibers. PMID:10559743

  3. Breaking strength and diameter of absorbable sutures after in vivo exposure in the rat.

    PubMed

    Outlaw, K K; Vela, A R; O'Leary, J P

    1998-04-01

    Although absorbable sutures are commonly used in clinical practice, the rate of decay of strength in various tissues has not been studied. The purpose of this study was to assess breaking strength (BS) and diameter of monofilament (chromic gut, polydiaxanone, Maxon, Monocryl) and multifilament (Vicryl, Dexon, Polysorb) absorbable sutures implanted in various sites and measured at specific time intervals. A 15 cm length of 4-0 suture from a single lot of each material was implanted in the pleural space, rectus abdominus muscle, subcutaneous tissue, intravascular space, peritoneal cavity, and stomach lumen in the rat. A precipitous decrease in BS was noted in all multifilament sutures after 7 days, and in chromic gut and Monocryl sutures after 1 day. Polydiaxanone and Maxon sutures maintained the highest BS over the 28-day period, 71 per cent and 59 per cent of their initial BS, respectively. Suture diameter remained essentially unchanged except for chromic gut and the multifilament sutures which exhibited increased diameter. This increase was attributed to inflammatory tissue infiltration. PMID:9544148

  4. Biomechanical performance of a braided absorbable suture.

    PubMed

    Faulkner, B C; Gear, A J; Hellewell, T B; Mazzarese, P M; Watkins, F H; Edlich, R F

    1996-01-01

    Lactomer and Polyglactin 910 sutures are both made of copolymers of lactide and glycolide. Biomechanical performance tests demonstrated superior handling characteristics of the Lactomer sutures. Using sutures comparable in size and knot construction, the Lactomer sutures exhibited knot holding force superior to the Polyglactin 910. Moreover, the low knot rundown forces encountered by the Lactomer sutures facilitated construction of secure knots that failed by breakage rather than by slippage. PMID:10167359

  5. The scientific basis for selecting surgical sutures.

    PubMed

    Lin, K Y; Farinholt, H M; Reddy, V R; Edlich, R F; Rodeheaver, G T

    2001-01-01

    The purpose of this study was to examine the handling properties of synthetic absorbable and monofilament polypropylene sutures made by two different manufacturers and to compare a subjective evaluation by surgeons to the results of standardized biomechanical performance tests. The surgeons' clinical subjective evaluation of the monofilament polypropylene sutures correlated with the results of the biomechanical performance studies, whereas the biomechanical evaluation of the two synthetic absorbable sutures detected notable differences in their performance. These distinct differences in biomechanical performance of the absorbable sutures did not alter their performance in the subjective clinical evaluation. PMID:11495103

  6. 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

  7. Flexor tendon repair: a comparative study between a knotless barbed suture repair and a traditional four-strand monofilament suture repair.

    PubMed

    Joyce, C W; Whately, K E; Chan, J C; Murphy, M; O'Brien, F J; Carroll, S M

    2014-01-01

    We compared the tensile strength of a novel knotless barbed suture method with a traditional four-strand Adelaide technique for flexor tendon repairs. Forty fresh porcine flexor tendons were transected and randomly assigned to one of the repair groups before repair. Biomechanical testing demonstrated that the tensile strengths between both tendon groups were very similar. However, less force was required to create a 2 mm gap in the four-strand repair method compared with the knotless barbed technique. There was a significant reduction in the cross-sectional area in the barbed suture group after repair compared with the Adelaide group. This would create better gliding within the pulley system in vivo and could decrease gapping and tendon rupture. PMID:23695149

  8. 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

  9. The in vivo histology of an absorbable suture anchor: a preliminary report

    Microsoft Academic Search

    F. Alan Barber; Michael A. Deck

    1995-01-01

    Suture anchors are playing an increasingly important role in attaching tendons or ligaments to bone. Anchors are usually made of metallic or other nonbioabsorbable materials. The development of an absorbable suture anchor would provide a valuable tool for the surgeon; this characteristic would minimize the problems of anchor loosening, migration, interference with imaging studies, and the potential requirement for later

  10. 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

  11. 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

  12. [Continuous suture in laparotomy using an absorbable eyelet thread according to the Smead Jones technique].

    PubMed

    Ribero, F; Canino, V; Comotti, F; Ragusa, L

    1994-01-01

    In 78 patients undergoing laparotomy suturing was carried out using absorbable thread (polyglyconate - Maxon) with eyelet to obtain a continuous knot-free suture according to Smead Jones' technique. A prospective study was made of all surgical wounds three months after the operation to evaluate the reliability of this technique. On examination, wounds were fully healed in 98% of patients. Less than 2% of patients revealed infections, dehiscence or anomalous granulations of the wound. No laparocele were observed at the time of control using this method. Continuous suture using a trimethylene polyglyconate (Maxon) thread with eyelet according to the Smead Jones technique was found to be safe and effective. A follow-up after a longer interval will be performed in this group of patients in order to confirm these conclusions. PMID:7991177

  13. Vaginal cuff closure at abdominal hysterectomy: comparing sutures with absorbable staples.

    PubMed

    Stovall, T G; Summitt, R L; Lipscomb, G H; Ling, F W

    1991-09-01

    To compare two methods of vaginal cuff closure during abdominal hysterectomy, 60 patients were randomized to one of two cuff-closure methods. The vaginal cuff was closed with three interrupted 0-Dexon sutures in 30 and with absorbable staples in 30. Both groups were similar with respect to age, gravidity, parity, preoperative indication, hemoglobin, and hematocrit. The operative technique and quantity of irrigation used was standardized. Operative blood loss was calculated by the weight method and an unactivated, medium flat Jackson-Pratt drain was left in place for collecting postoperative cuff cultures at 24 and 48 hours. The mean operative times in the suture group (97.4 minutes) and staple group (93.4 minutes) were not significantly different (P greater than .05). Cuff-closure time was more rapid (P = .0001) in the staple group (5.8 minutes) than in the suture group (9.3 minutes). Intraoperative cultures were positive in eight of 30 suture patients (26.7%) and eight of 30 staple patients (26.7%). Postoperative cultures at either 24 or 48 hours were positive in four women (13.3%) in the suture group and six (20%) in the staple group. Febrile morbidity occurred in six (20%) in each group. Three staple and two suture subjects developed a vaginal cuff abscess or hematoma, one of whom was readmitted to the hospital for intravenous antibiotics and draining of the vaginal cuff abscess. The presence of a positive vaginal cuff culture did not predict clinical outcome. Based on these observations and the increased cost of the stapling device, we conclude that there is no significant clinical advantage of surgical staples over traditional sutures for vaginal cuff closure at abdominal hysterectomy. PMID:1876376

  14. 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

  15. 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.

  16. Fast Absorbing Gut Suture versus Cyanoacrylate Tissue Adhesive in the Epidermal Closure of Linear Repairs Following Mohs Micrographic Surgery

    PubMed Central

    Kim, June; Cool, Alicia J.; Hanlon, Allison M.; Leffell, David J.

    2015-01-01

    Background: Cyanoacrylate topical adhesives and fast absorbing gut sutures are increasingly utilized by dermatologic surgeons as they provide satisfactory surgical outcomes while eliminating an additional patient visit for suture removal. To date, no head-to-head studies have compared the wound healing characteristics of these epidermal closure techniques in the repair of facial wounds after Mohs micrographic surgery. Objective: To compare the cosmetic outcome of epidermal closure by cyanoacrylate topical adhesive with fast absorbing gut suture in linear repairs of the face following Mohs micrographic surgery. Methods: Fourteen patients with wound length greater than 3cm who underwent Mohs micrographic surgery for nonmelanoma skin cancer of the face were enrolled in this randomized right-left comparative study. Following placement of dermal sutures, half of the wound was randomly selected for closure with cyanoacrylate and the contralateral side with fast absorbing gut suture. Using photographs from the three-month postoperative visit, six blinded individuals rated the overall cosmetic outcome. Results: The present study shows no significant difference in cosmetic outcomes between cyanoacrylate and fast absorbing gut suture for closure of linear facial wounds resulting from Mohs micrographic surgery. Cyanoacrylate tissue adhesive may not be as effective in achieving optimal cosmesis for wounds on the forehead or of longer repair lengths. The majority of patients did not have a preference for wound closure techniques, but when a preference was given, cyanoacrylate was significantly favored over sutures. Conclusion: Cyanoacrylate tissue adhesive and fast absorbing gut suture both result in comparable aesthetic outcomes for epidermal closure of linear facial wounds following Mohs micrographic surgery. Consideration should be given to factors such as need for eversion, hemostasis, and wound tension when selecting an epidermal wound closure method. (ClinicalTrials.gov, Identifier: NCT01298167, http://clinicaltrials.gov/show/NCT01298167). PMID:25741400

  17. Evaluation of four suture materials for surgical incision closure in Siberian sturgeon

    USGS Publications Warehouse

    Boone, S. Shaun; Hernandez, Sonia M.; Camus, Alvin C.; Peterson, Douglas C.; Jennings, Cecil A.; Shelton, James L.; Divers, Stephen J.

    2015-01-01

    The visual and microscopic tissue reactions to the absorbable monofilament Monocryl, absorbable monofilament triclosan-coated Monocryl-Plus, absorbable multifilament Vicryl, and nonabsorbable monofilament Prolene were evaluated for their use of surgical closure in Siberian Sturgeon Acipenser baerii. Postoperative assessments were conducted at 1, 2, 8, 12, and 26 and 55 weeks to visually evaluate the surgical incision for suture retention, incision healing, erythema, and swelling. Incisions were also assessed microscopically at 1, 2, and 8 weeks for necrosis, inflammation, hemorrhage, and fibroplasia. The results indicated that incisions closed with either Vicryl or Prolene suture materials were more likely to exhibit more erythema or incomplete healing compared with those closed with Monocryl or Monocryl-Plus. The surgical implantation of a transmitter in the coelomic cavity did not significantly affect the response variables among the four suture materials. Monocryl or Monocryl-Plus were equally effective and superior to other suture materials used for closing surgical incisions in Siberian Sturgeon or closely related species of sturgeon. Furthermore, Monocryl or Monocryl-Plus may decrease the risk of transmitter expulsion through the incision, as surgical wounds appear to heal faster and exhibit less erythema compared with those closed with Vicryl.

  18. 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...

  19. 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...

  20. 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...

  1. 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

  2. Comparison of Piezoresistive Monofilament Polymer Sensors

    PubMed Central

    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

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

    PubMed

    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. PMID:8822788

  4. Mechanics of Suture Joints

    NASA Astrophysics Data System (ADS)

    Li, Yaning; Song, Juha; Ortiz, Christine; Boyce, Mary; Ortiz group/DMSE/MIT Team; Boyce group/ME/MIT Team

    2011-03-01

    Biological sutures are joints which connect two stiff skeletal or skeletal-like components. These joints possess a wavy geometry with a thin organic layer providing adhesion. Examples of biological sutures include mammalian skulls, the pelvic assembly of the armored fish Gasterosteus aculeatus (the three-spined stickleback), and the suture joints in the shell of the red-eared slider turtle. Biological sutures allow for movement and compliance, control stress concentrations, transmit loads, reduce fatigue stress and absorb energy. In this investigation, the mechanics of the role of suture geometry in providing a naturally optimized joint is explored. In particular, analytical and numerical micromechanical models of the suture joint are constructed. The anisotropic mechanical stiffness and strength are studied as a function of suture wavelength, amplitude and the material properties of the skeletal and organic components, revealing key insights into the optimized nature of these ubiquitous natural joints.

  5. 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.

  6. [Tip sutures].

    PubMed

    Duron, J-B; Noel, W; Nguyen, P S; Jallut, Y; Aiach, G

    2014-12-01

    Suture techniques are widely used and can be very useful and efficient to support the nasal tip and correct its deformities. Nevertheless, they are so powerful that they have to be performed very precisely if the surgeon does not want to create cosmetics as well as functional problems. The authors describe the main tip sutures and their effects, expected or not. PMID:25213489

  7. An innovative surgical suture and needle evaluation and selection program.

    PubMed

    Szarmach, Robin R; Livingston, Jean; Rodeheaver, George T; Thacker, John G; Edlich, Richard F

    2002-01-01

    This report describes an innovative suture and needle clinical evaluation program jointly designed by hospital representatives of Consorta, Inc., a healthcare resource management and group purchasing organization, and United States Surgical/Davis & Geck Sutures (USS/D&G), manufacturer of surgical biomaterials. Nineteen Consorta shareholder hospitals enrolled 699 surgeons to participate in Phase I of this nonexperimental observational study of the clinical performance of surgical needles and sutures. Performance characteristics of the sutures and needles produced by USS/D&G, which were evaluated in 3407 surgical procedures, included packaging and ease of opening, needle strength and sharpness, tissue drag, knot security, tensile strength, and clinically acceptable and unacceptable determinations. In these 30-day studies, the surgeons concluded that the needles and sutures were clinically acceptable in 98.1% of the evaluations. The general, cardiothoracic, and orthopedic surgeons, who performed 73.8% of the product evaluations, reported that the suture and needle products were clinically acceptable in 97.2% of the evaluations. More than half (50.1%) of the evaluations involved the POLYSORB* braided synthetic sutures,which received a clinically acceptable rating in 98.4% of the evaluation. The next most frequently used sutures were the SOFSILK*, followed by the monofilament nylon suture. SOFSILK* was found to be clinically acceptable in 98.7% of the evaluations, whereas the monofilament nylon was noted to be clinically acceptable in 96.3% of the evaluations. Surgical needles made by USS/D&G had a 97.9% clinical acceptability rating. PMID:12627784

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

    PubMed

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

    2015-05-01

    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. PMID:25045025

  9. 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

  10. 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).

  11. [Ideal suture methods for skin, subcutaneous tissues and sternum].

    PubMed

    Ogawa, Rei

    2012-04-01

    Non-absorbable sternal closure methods such as stainless steel wiring have been widely used, but biocompatibility and osteoconductivity of absorbable materials have advantages in acceleration of wound healing. Combined use of stainless steel wires with absorbable materials may contribute to minimizing sternal complications.Fascial tension reduction sutures, where the tension is placed on the layer of deep fascia and superficial fascia, are recommended for skin/subcutaneous closure. This means that the use of dermal sutures is minimized;indeed, dermal sutures can be avoided altogether if the wound edges can be joined naturally under very small tension. We prefer 0, 2-0 polydioxanone sutures (PDS II) for deep/superficial fascia sutures, 4-0 or 5-0 PDS II for dermal sutures (if they are necessary), and 6-0 or 7-0 polypropylene or nylon sutures (Proline or Ethilon) for superficial sutures. The consequence of such suturing is that the wound edges are elevated smoothly with minimal tension on the dermis that appears to prevent the development of large scars. PMID:22485038

  12. 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.

  13. Monofilament Insensitivity and Small and Large Nerve Fiber Symptoms in Impaired Fasting Glucose

    PubMed Central

    Ylitalo, Kelly R.; Herman, William H.; Harlow, Siobán D.

    2014-01-01

    Aims To determine if diabetes or pre-diabetes is associated with monofilament insensitivity and peripheral neuropathy symptoms. Methods The 10-g Semmes-Weinstein monofilament test and Michigan Neuropathy Screening Instrument symptom questionnaire were administered to participants in the Study of Women’s Health Across the Nation – Michigan site (n=396). We determined the concordance of monofilament insensitivity and symptoms and used chi-square tests, ANOVA, and logistic regression to quantify the relationships among diabetes status, monofilament insensitivity, and symptoms. Results The prevalence of monofilament insensitivity was 14.3%, and 19.4% of women reported symptoms of peripheral neuropathy. With monofilament testing, 11.7% of women with normal fasting glucose, 14.4% of women with impaired fasting glucose (IFG), and 18.3% of women with diabetes had monofilament insensitivity (p-value=0.33). For symptoms, 14.0% of women with normal fasting glucose, 16.5% of women with IFG, and 31.2% of women with diabetes reported symptoms of peripheral neuropathy. Women who reported symptoms of small fiber nerve dysfunction alone were unlikely to have monofilament insensitivity. Compared to women with normal fasting glucose, women with diabetes were more likely to report peripheral neuropathy symptoms [OR 2.8 (95% CI: 1.5, 5.1)]. Women with diabetes were also more likely to report symptoms than women with IFG (p=0.02). There was no difference in the frequency of symptoms between women with normal fasting glucose and IFG. Conclusions Women with diabetes were more likely to report peripheral neuropathy symptoms. The prevalence of monofilament insensitivity and peripheral neuropathy symptoms did not differ between women with normal fasting glucose and IFG. PMID:23896181

  14. 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

  15. Experimental studies in swine for measurement of suture extrusion.

    PubMed

    Drake, David B; Rodeheaver, Pamela F; Edlich, Richard F; Rodeheaver, George T

    2004-01-01

    The purpose of this scientific investigation was to identify the determinants of suture extrusion following subcuticular skin closure of dermal skin wounds. Miniature swine were used to develop a model for studying suture extrusion. Standard, full-thickness skin incisions were made on each leg and the abdomen. The wounds were closed with size 4/0 POLYSORB* or COATED VICRYL* sutures. Each incision was closed with five interrupted, subcuticular, vertical loops secured with a surgeon's knot. The loops were secured with 3-throw knots in one pig, 4-throw knots in the second pig, and 5-throw knots in the third pig. The swine model reproduced the human clinical experience and suture extrusion, wound dehiscence, stitch abscess, and granuloma formation were all observed. The cumulative incidence of suture extrusion over 5 weeks ranged from 10 to 33%. COATED VICRYL* sutures had a higher mean cumulative incidence of suture extrusion than that of POLYSORB* sutures (31% vs. 19%). With POLYSORB* sutures, the 5-throw surgeon's knots had a higher cumulative incidence of suture extrusion than the 3-throw or 4-throw surgeon's knot square, 30% vs. 17% and 10%, respectively. This swine model offers an opportunity to study the parameters that influence suture extrusion. Because the volume of suture material in the wound is obviously a critical determinant of suture extrusion, it is imperative that the surgeon construct a knot that fails by breakage, rather than by slippage with the least number of throws. Because both braided absorbable suture materials are constructed with a secure surgical knot that fails only by breakage rather than slippage with a 3-throw surgeon's knot square (2 = 1 = 1), the construction of additional throws with these sutures does not enhance the suture holding capacity but plays a key factor in precipitating suture extrusion. Finally, it is important to emphasize that the surgeon must always construct symmetrical surgical knots for dermal subcuticular skin closure in which the constructed knot is always positioned perpendicular to the linear wound incision. Asymmetrical knot construction for dermal wound closure becomes an obvious invitation for suture extrusion. PMID:15301668

  16. Regulation of Cranial Suture Morphogenesis

    Microsoft Academic Search

    Roy C. Ogle; Sunil S. Tholpady; Kathryn A. McGlynn; Rebecca A. Ogle

    2004-01-01

    The cranial sutures are the primary sites of bone formation during skull growth. Morphogenesis and phenotypic maintenance of the cranial sutures are regulated by tissue interactions, especially those with the underlying dura mater. Removal of the dura mater in fetuses causes abnormal suture development and premature suture obliteration. The dura mater interacts with overlying tissues of the cranial vault by

  17. Absorbable staples in continent ileal urinary pouch.

    PubMed

    Bonney, W W; Robinson, R A

    1990-01-01

    Continent ileal urinary reservoirs were created in dogs to study absorbable surgical staples. Within each pouch, certain controlled observations were possible. The staples and chemically similar polyglactin absorbable sutures caused almost identical tissue reactions. The staples outlasted the sutures, probably because of greater size. Inverted and everted staple closures worked equally well. It appears feasible to consider clinical urinary diversion with absorbable staples, a time-saving method. PMID:2404367

  18. An expanded surgical suture and needle evaluation and selection program by a healthcare resource management group purchasing organization.

    PubMed

    Szarmach, Robin R; Livingston, Jean; Edlich, Richard E

    2003-01-01

    The purpose of this report is to describe an expanded suture and needle clinical evaluation program jointly designed by hospital representatives of Consorta, Inc. (Rolling Meadows, Illinois), a leading healthcare resource management and group purchasing organization, and United States Surgical/Davis & Geck Sutures (Division of United States Surgical, Norwalk, Connecticut). In this expanded evaluation program, 42 Consorta shareholder hospitals enrolled 1913 surgeons to participate in Phase II of this non-experimental observational study of the clinical performance of surgical needles and sutures. Performance characteristics of the sutures and needles produced by USS/DG that were evaluated in 25,545 surgical procedures included packaging/ease of opening, needle strength and sharpness, tissue drag, knot security, tensile strength, clinically acceptable determinations, and clinically unacceptable determinations. In these 30-day studies, the surgeons found that the needles and sutures were clinically acceptable in 98.1% of the evaluations. The general, cardiothoracic, and orthopedic surgeons who performed 61.2% of the product evaluations reported that the suture and needle products were clinically acceptable in 98.2% of the evaluations. Nearly half (49.2%) of the evaluations involved the POLYSORB* braided synthetic sutures that received a clinically acceptable rating in 98.2% of the evaluation. The silk suture (SOFSILK*), followed by the monofilament nylon suture (MONOSOF*), were the next most frequently used sutures. The SOFSILK* was found to be clinically acceptable in 99.2% of the evaluations, while MONOSOF* was noted to be clinically acceptable in 98.7% of the evaluations. Surgical needles made by USS/DG Sutures also had a high rating of clinical acceptability (97.9%). PMID:14516182

  19. Microstructural Stability and Mechanical Properties of Directionally Solidified Alumina\\/YAG Eutectic Monofilaments

    Microsoft Academic Search

    L. E. Matson; N. Hecht

    1999-01-01

    Fiber strength retention and creep currently limit the use of polycrystalline oxide fibers in ceramic matrix composites making it necessary to develop single crystal fibers. Two-phase alumina\\/YAG single crystal structures in the form of monofilaments show that the room temperature tensile strength increases according to the inverse square root of the microstructure size. Therefore, microstructure stability will play a significant

  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. 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

  2. Development of lens sutures.

    PubMed

    Kuszak, Jer R; Zoltoski, Rebecca K; Tiedemann, Clifford E

    2004-01-01

    Cylindrical map projections (CMPs) have been used for centuries as an effective means of plotting the features of a 3D spheroidal surfaces (e.g. the earth) on a 2D rectangular map. We have used CMPs to plot primate fiber cell organization from selected growth shells as a function of growth, development and aging. Lens structural parameters and features were derived from slit-lamp, light and transmission and scanning electron micrographs. This information was then used to create CMPs of lenses that were then correlated with azimuthal map projections (AMPs; projections that are radially symmetric around a central point [the poles]) to reveal different suture patterns during distinct time periods. In this manner, both lens fiber and suture branch locations are defined by degrees of longitude and latitude. CMPs and AMPs confirm that throughout defined periods of development, growth and ageing, increasingly complex suture patterns are formed by the precise ordering of straight and opposite end curvature fibers. However, the manner in which additional suture branches are formed anteriorly and posteriorly is not identical. Anteriorly, new branches are added between extant branches. Posteriorly, pairs of new branches are formed that progressively overlay extant branches. The advantage of using CMPs is that the shape and organization of every fiber in a growth shell can be observed in a single image. Thus, the use of CMPs to plot primate fiber cell organization has revealed more complex aspects of fiber formation that may explain, at least in part, changes in lens optical quality as a function of age and pathology. In addition, more accurate measurements of fiber length will be possible by incorporating the latitudinal and longitudinal locations of fibers. PMID:15558480

  3. [Resorbable staple sutures for partial stomach and duodenal stump closure. Animal experiment studies].

    PubMed

    Walgenbach, S; Sorger, K; Junginger, T

    1990-01-01

    In two groups of pigs, 10 in each, partial gastrectomies with gastroduodenostomy (Billroth I) respectively gastrojejunostomy (Roux-en-Y) were performed. Absorbable lactomer (Polysorb, Auto-Suture) staple lines--a copolymer of glycolic acid/lactic acid-, used for the closure of the lesser curvature of the stomach and the duodenal stump, were safe. No suture dehiscence was observed. Macroscopic examination showed no major inflammatory adhesions around the staples. Microscopically inflammatory reactions around the staples in the gastrointestinal wall were found. Our results yielded no contraindication for clinical tests of absorbable sutures in gastrointestinal surgery. PMID:2329892

  4. Treatment of acromioclavicular joint separation: Suture or suture anchors?

    Microsoft Academic Search

    Marc J Breslow; Laith M Jazrawi; Adam D Bernstein; Frederick J Kummer; Andrew S Rokito

    2002-01-01

    This investigation compared the stability of 2 methods of fixation for acromioclavicular (AC) joint separations. A complete AC joint separation was simulated in 6 matched pairs of fresh-frozen human cadaveric shoulders. One specimen from each pair was repaired with two No. 5 nonabsorbable braided sutures passed around the base of the coracoid and the other with 2 suture anchors preloaded

  5. A study on in vitro degradation behavior of a poly(glycolide-co- l-lactide) monofilament

    Microsoft Academic Search

    Meng Deng; Gavin Chen; Daniel Burkley; Jack Zhou; Dennis Jamiolkowski; Yunmei Xu; Robert Vetrecin

    2008-01-01

    The in vitro degradation behaviors of a poly(glycolide-co-l-lactide) 90\\/10 monofilament were investigated in phosphate buffer solution at pH 7.4 over a temperature range of 27.5–47.5°C. The property changes of the monofilament with time at different temperatures were evaluated by tensile mechanical test, gel permeation chromatography analysis, and image techniques (optical microscopy, scanning electron microscopy and atomic force microscopy). The interrelationships

  6. 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.

  7. Current applications of endoscopic suturing

    PubMed Central

    Stavropoulos, Stavros N; Modayil, Rani; Friedel, David

    2015-01-01

    Endoscopic suturing had previously been considered an experimental procedure only performed in a few centers and often by surgeons. Now, however, endoscopic suturing has evolved sufficiently to be easily implemented during procedures and is more commonly used by gastroenterologists. We have employed the Apollo OverStitch suturing device in a variety of ways including closure of perforations, closure of full thickness defects in the gastrointestinal wall created during endoscopic full thickness resection, closure of mucosotomies during peroral endoscopic myotomy, stent fixation, fistula closure, post endoscopic submucosal dissection, endoscopic mucosal resection and Natural Orifice Transluminal Endoscopic Surgery defect closures, post-bariatric surgery gastrojejunal anastomosis revision and primary sleeve gastroplasty.

  8. Cranial sutures and diploae morphology.

    PubMed

    Corega, Claudia; Vaida, Ligia; Ilia?, Ioana Tiberia; Bertossi, D; Dasc?lu, Ionela Teodora

    2013-01-01

    The aim of the study was to assess the normal cranial suture and bone diploae ultrastructural morphology. Two types of sutures from different specimens were collected. The micro-CT scanning provided a three-dimensional view of the sutures at a microscopic level thus allowing the evaluation of the development stage and a rapid analysis evaluation of bone and diploae morphology. In the meantime, the micro-CT is able to generate more slices than the normal histology preserving the analyzed specimens and became one of the most powerful tools in the craniofacial area. The micro-CT analysis generated structure-orientated slices that in conjunction with the histological sections provide a high quality quantitative analysis of all cranial sutures and of the cranial bones diploae. PMID:24399017

  9. Craniosynostosis of the lambdoid suture.

    PubMed

    Rhodes, Jennifer L; Tye, Gary W; Fearon, Jeffrey A

    2014-08-01

    Craniosynostosis affecting the lambdoid suture is uncommon. The definition of lambdoid craniosynostosis solely applies to those cases demonstrating true suture obliteration, similar to other forms of craniosynostosis. In patients presenting with posterior plagiocephaly, true lambdoid craniosynostosis must be differentiated from the much more common positional molding. It can occur in a unilateral form, a bilateral form, or as part of a complex craniosynostosis. In children with craniofacial syndromes, synostosis of the lambdoid suture most often is seen within the context of a pansynostotic picture. Chiari malformations are commonly seen in multisutural and syndromic types of craniosynostosis that affect the lambdoid sutures. Posterior cranial vault remodeling is recommended to provide adequate intracranial volume to allow for brain growth and to normalize the skull shape. Although many techniques have been described for the correction of lambdoid synostosis, optimal outcomes may result from those techniques based on the concept of occipital advancement. PMID:25210507

  10. A new suture material for repair of the injured spleen

    Microsoft Academic Search

    Ata Erdener; Can Taneli; Co?kun Özcan; Yusuf Duman; Necmettin Özdemir

    1994-01-01

    Parenchyma-Set, a new absorbable collagen-tape suture material, was used in the present study for the repair of experimentally injured spleens and the results compared with polyglactin. Standard splenic injuries were produced in ten mongrel dogs. The spleens of five (group I) were repaired with Parenchyma-Set and those of the other five (group II) with polyglactin. Isotope uptakes of the spleens

  11. Early Skin Reaction of Polydioxanone Suture Material Following Septorhinoplasty

    PubMed Central

    Kuduban, Ozan; Kuduban, Selma Denkta?

    2015-01-01

    Patient: Male, 27 Final Diagnosis: Postoperatif healing Symptoms: Feeling of foreign body on the nasal tip Medication: — Clinical Procedure: Minor intervention and follow-ups Specialty: Otolaryngology Objective: Unusual clinical course Background: Septorhinoplasty is a frequent surgical procedure used for both cosmetic and functional purposes. The technique varies from surgeon to surgeon and according to which suture material is used. While some surgeons prefer non-absorbable sutures, others prefer sutures with delayed absorption. These materials sometimes protrude from the skin and they may cause skin reactions. While these reactions are common in the late period, a skin reaction in the early period because of polydioxanone suture is extremely rare and to the best of our knowledge, this is the first such reported case in the literature. Case Report: A 25-year-old male patient underwent endonasal septorhinoplasty procedure with endo-tracheal general anesthesia. We hereby present the skin reaction because of frequently used polydioxanone suture on the 24th postoperative day and the management of this patient. We cut the suture at skin level and prescribed antibiotherapy, and we scheduled a follow-up for 10 days afterwards. The patient had no complaint and the control examination result was normal. Conclusions: When performing septorhinoplasty operations, very rare complications of the procedure shouldn’t be ignored and an informed consent must be obtained after explaining possible complications before the operation. This approach is important for increasing the patient compliance and proper follow-up for the patient. This way, especially post-operative early complications as our case will be able to be solved with close follow-up and intervention, before causing permanent damage. The relationship between patient who underwent rhinoplasty and the physician also has an important role on these follow-up visits. PMID:25951921

  12. Early skin reaction of polydioxanone suture material following septorhinoplasty.

    PubMed

    Kuduban, Ozan; Denkta? Kuduban, Selma

    2015-01-01

    BACKGROUND Septorhinoplasty is a frequent surgical procedure used for both cosmetic and functional purposes. The technique varies from surgeon to surgeon and according to which suture material is used. While some surgeons prefer non-absorbable sutures, others prefer sutures with delayed absorption. These materials sometimes protrude from the skin and they may cause skin reactions. While these reactions are common in the late period, a skin reaction in the early period because of polydioxanone suture is extremely rare and to the best of our knowledge, this is the first such reported case in the literature. CASE REPORT A 25-year-old male patient underwent endonasal septorhinoplasty procedure with endo-tracheal general anesthesia. We hereby present the skin reaction because of frequently used polydioxanone suture on the 24th postoperative day and the management of this patient. We cut the suture at skin level and prescribed antibiotherapy, and we scheduled a follow-up for 10 days afterwards. The patient had no complaint and the control examination result was normal. CONCLUSIONS When performing septorhinoplasty operations, very rare complications of the procedure shouldn't be ignored and an informed consent must be obtained after explaining possible complications before the operation. This approach is important for increasing the patient compliance and proper follow-up for the patient. This way, especially post-operative early complications as our case will be able to be solved with close follow-up and intervention, before causing permanent damage. The relationship between patient who underwent rhinoplasty and the physician also has an important role on these follow-up visits. PMID:25951921

  13. Journal of the European Ceramic Society 25 (2005) 19291942 High temperature properties of SiC and diamond CVD-monofilaments

    E-print Network

    Bristol, University of

    2005-01-01

    of silicon carbide (SiC) monofilaments with the high ductility, toughness and corrosion resistance of intergranular secondary phases (free carbon or silicon). The strong covalent bonds and the microcrystalline (EB-PVD) tape/monofilament coating).1­3 An alternative and more affordable processing route

  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. The Bentong Raub Suture Zone

    NASA Astrophysics Data System (ADS)

    Metcalfe, I.

    2000-12-01

    It is proposed that the Bentong-Raub Suture Zone represents a segment of the main Devonian to Middle Triassic Palaeo-Tethys ocean, and forms the boundary between the Gondwana-derived Sibumasu and Indochina terranes. Palaeo-Tethyan oceanic ribbon-bedded cherts preserved in the suture zone range in age from Middle Devonian to Middle Permian, and mélange includes chert and limestone clasts that range in age from Lower Carboniferous to Lower Permian. This indicates that the Palaeo-Tethys opened in the Devonian, when Indochina and other Chinese blocks separated from Gondwana, and closed in the Late Triassic (Peninsular Malaysia segment). The suture zone is the result of northwards subduction of the Palaeo-Tethys ocean beneath Indochina in the Late Palaeozoic and the Triassic collision of the Sibumasu terrane with, and the underthrusting of, Indochina. Tectonostratigraphic, palaeobiogeographic and palaeomagnetic data indicate that the Sibumasu Terrane separated from Gondwana in the late Sakmarian, and then drifted rapidly northwards during the Permian-Triassic. During the Permian subduction phase, the East Malaya volcano-plutonic arc, with I-Type granitoids and intermediate to acidic volcanism, was developed on the margin of Indochina. The main structural discontinuity in Peninsular Malaysia occurs between Palaeozoic and Triassic rocks, and orogenic deformation appears to have been initiated in the Upper Permian to Lower Triassic, when Sibumasu began to collide with Indochina. During the Early to Middle Triassic, A-Type subduction and crustal thickening generated the Main Range syn- to post-orogenic granites, which were emplaced in the Late Triassic-Early Jurassic. A foredeep basin developed on the depressed margin of Sibumasu in front of the uplifted accretionary complex in which the Semanggol "Formation" rocks accumulated. The suture zone is covered by a latest Triassic, Jurassic and Cretaceous, mainly continental, red bed overlap sequence.

  16. Composite surgical sutures with bioactive glass coating.

    PubMed

    Boccaccini, Aldo R; Stamboulis, Artemis G; Rashid, Azrina; Roether, Judith A

    2003-10-15

    A processing method was developed to coat polyglactin 910 (Vicryl) sutures with bioactive glass powder (45S5 Bioglass). High reproducibility and homogeneity of the coating in terms of microstructure and thickness along the suture length were achieved. Bioglass-coated sutures exhibited a high level of chemical reactivity in simulated body fluid (SBF), indicating their bioactive behavior. This was evident by the prompt formation of hydroxyapatite (HA) crystals on the surface after only 7 days of immersion in SBF. These crystals grew to form a thick HA layer (15 microm thickness) after 3 weeks in SBF. The tensile strength of the sutures was tested before and after immersion in SBF in order to assess the effect of the bioactive glass coating on suture degradation. The tensile strength of composite sutures was lower than that of as-received Vicryl sutures, 385 and 467 MPa, respectively. However, after 28 days of immersion in SBF the residual tensile strengths of coated and uncoated sutures were similar (83 and 88 MPa, respectively), indicating no negative effect of the HA layer formation on the suture strength. The effect of bioactive glass coating on the polymer degradation is discussed. The developed bioactive sutures represent interesting materials for applications in wound healing, fabrication of fibrous three-dimensional scaffolds for tissue engineering, and reinforcement elements for calcium-phosphate temporary implants. PMID:14528459

  17. Tissue welding for corneal wound suture with a CW 1.9-um diode laser: an in-vivo preliminary study

    NASA Astrophysics Data System (ADS)

    Desmettre, Thomas; Mordon, Serge R.; Mitchell, Valerie A.

    1996-01-01

    This study aimed to evaluate the interest of a 1.9 micrometer diode laser for corneal wound suture. Six adult albino rabbits were anesthetized. A 7 mm corneal incision was practiced on the right eye. For 3 animals (laser plus stitch) the incision was surgically sutured with 2 stitches of a nylon monofilament and laser impacts were performed between the stitches. For 3 animals (laser only) juxtaposed lasers impacts were realized to suture the wound. After the procedure the animals were examined daily for signs of inflammation, infection and for healing of the corneal wound. Material was obtained for histological examination 1 month after the procedure. Approximation of the edges of the would was successfully obtained in the (laser plus stitch) group. In the (laser only) group this approximation remained troublesome. After the procedure, one cornea of the (laser only) group disclosed a little leakage during 2 days. Histological examination assessed the welding of the corneal wound in the two groups provided structural modifications and some inflammatory signs. Corneal welding using a 1.9 micrometer diode laser is possible either with laser and stitch or with laser only. The approximation of the edges of the wound with additional stitches is an evident drawback. The use of additional stitches should be avoided to keep the theoretical advantages of corneal would suture using laser welding.

  18. The effect of a weak W/SiC interface on the strength of sigma silicon carbide monofilament

    PubMed

    Dyos; Shatwell

    1999-11-01

    Fractography studies have shown that the strength-determining flaws in silicon carbide monofilaments are generally at the core/silicon carbide interface or in the vicinity of the outside, carbon-based coating. In tungsten-cored monofilaments like DERA Sigma, the W/SiC flaws primarily determine the strength. Fracture is accompanied by brittle failure of the tungsten. The crack propagates simultaneously outwards through the silicon carbide, inwards through the tungsten and also around the W/SiC interface before being deflected into the tungsten or out through the silicon carbide. Experiments depositing boundary layers between the tungsten and silicon carbide have resulted in significantly different fracture behaviour. The tungsten fails in a ductile manner and the strength-determining flaws are located predominantly at the outside surface of the silicon carbide. This behaviour is discussed in terms of models proposed by E. Martin and W. Curtin. It is thought that the work will ultimately lead to a significantly stronger, tungsten-based monofilament. PMID:10540270

  19. Geometrically controlled tensile response of braided sutures.

    PubMed

    Rawal, Amit; Sibal, Apurv; Saraswat, Harshvardhan; Kumar, Vijay

    2015-03-01

    Sutures are the materials used for wound closure that are caused by surgery or trauma. The main pre-requisite to the success of the suture is to obtain ultimate level of tensile properties with defined geometrical constraints. In this communication, the model for tensile properties of braided sutures has been proposed by elucidating the most important geometrical and material parameters. The model has accounted for the kinematical changes occurring in the braid and constituent strand geometries under defined level of strain. A comparison has been made between the theoretical and experimental results of stress-strain characteristics of braided sutures. PMID:25579946

  20. Transoral Mucosal Excision Sutured Gastroplasty

    PubMed Central

    Legner, Andras; Altorjay, Aron; Juhasz, Arpad; Stadlhuber, Rudolph; Reich, Viktor; Hunt, Brandon; Rothstein, Richard

    2014-01-01

    Introduction. An outpatient transoral endoscopic procedure for gastroesophageal reflux disease (GERD) and obesity would be appealing if safe, effective, and durable. We present the first in human experience with a new system. Methods. Eight patients with GERD (3) and obesity (5) were selected according to a preapproved study protocol. All GERD patients had preprocedure manometry and pH monitoring to document GERD as well as quality of life and symptom questionnaires. Obese patients (body mass index >35) underwent a psychological evaluation and tests for comorbidities. Under general anesthesia, a procedure was performed at the gastroesophageal junction including mucosal excision, suturing of the excision beds for apposition, and suture knotting. Results. One patient with micrognathia could not undergo the required preprocedural passage of a 60 F dilator and was excluded. The first 2 GERD patients had incomplete procedures due to instrument malfunction. The subsequent 5 subjects had a successfully completed procedure. Four patients were treated for obesity and had an average excess weight loss of 30.3% at 2-year follow-up. Of these patients, one had an 8-mm outlet at the end of the procedure recognized on video review—a correctable error—and another vomited multiple times postoperatively and loosened the gastroplasty sutures. The treated GERD patient had resolution of reflux-related symptoms and is off all antisecretory medications at 2-year follow-up. Her DeMeester score was 8.9 at 24 months. Conclusion. The initial human clinical experience showed promising results for effective and safe GERD and obesity therapy. PMID:24623807

  1. 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

  2. The in-vitro assessment of a collagen\\/vicryl (polyglactin) composite film together with candidate suture materials for use in urinary tract surgery

    Microsoft Academic Search

    S. D. Gorham; J. D. Anderson; M. J. Monsour; R. Scott

    1988-01-01

    Collagen coated vicryl mesh has been incubated with a series of urine collections from healthy and stoneforming patients. For comparison, collagen film, vicryl mesh, and a number of absorbable and non-absorbable sutures were similarly tested. Incubation in rabbit urine were also included in the study. Deposition of urinary salts, estimated qualitatively by electron microcopy, were observed on the collagen vicryl

  3. Shock absorber

    Microsoft Academic Search

    G. F. Kalb; D. M. Brown

    1987-01-01

    A shock absorber is described for a wireline instrument for use in a liquid containing well to reduce sock if the instrument impacts on an object while being lowered, the shock absorber comprising: a sleeve, having an inner surface; a mandrel, telescopically movable within the sleeve from an outward extended position to an inward retracted position if a sufficient impact

  4. 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.

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

    E-print Network

    Jonnalagadda, Silpa P.

    2005-08-29

    whether suture anchor failure due to eyelet cut-out or suture wear-out resulting from the sharp edges of the eyelet is the major cause of failure of bone-suture anchor-bone complexes. Cyclic loading of suture anchors during testing for durability has...

  6. Introduction of a new double-looped suture.

    PubMed

    Medina, M

    1995-02-01

    Two new sutures are introduced for laparoscopic two-handed instrument suturing and knot tying, as well as a device for making them. In the first design, a nonslipping loop is placed at each end of a straight suture; they act as anchoring devices to maintain the suture in the two-dimensional plane of focus of the laparoscopic camera. The loops provide a large surface area that facilitates grasping the suture during the rotational and pulling maneuvers employed in instrument knot tying. The double-looped suture can be used for tying off and retracting tubular structures. The second design consists of a suture ligature with a curved or straight needle at one end and a single, non-slipping loop at the other. Illustrations demonstrate tying and suturing techniques for approximating tissue with the new sutures. A device consisting of two pairs of posts, for making the looped suture in a uniform fashion, is also discussed. PMID:7735541

  7. 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, ...

  8. Two-handed next generation suturing simulator.

    PubMed

    Lindblad, Alex J; Turkiyyah, George M; Sankaranarayanan, Ganesh; Weghorst, Suzanne J; Berg, Daniel

    2004-01-01

    A realistic two-handed surgical suturing simulation would have a broad impact on the way doctors are trained in the field of surgery. Current state-of-the-art in suturing simulators do not accurately represent realistic suturing conditions, leaving many necessary components, i.e. two-handed interaction, skin undermining, skin repositioning etc., out of the model completely. The goal of this research is to develop a next generation immersive suturing simulator that uses an integrated two-handed tension based haptic device for tactile feedback, a hi-fidelity finite element model for more accurate skin, tissue and needle modeling and stereoscopic vision for depth-of-field. PMID:15544274

  9. Miniscrew Assisted Slow Expansion of Mature Sutures 

    E-print Network

    Pulver, Ross

    2014-04-28

    The purpose of this study was to evaluate whether complex, mature sutures could be separated using skeletal anchorage and light, continuous forces. Twelve adult female New Zealand White (NZW) rabbits, 8 to 9 months old, were randomly assigned...

  10. Subscapularis Tendon Repair Using Suture Bridge Technique

    PubMed Central

    Park, Yong Bok; Park, Young Eun; Koh, Kyoung Hwan; Lim, Tae Kang; Shon, Min Soo; Yoo, Jae Chul

    2015-01-01

    The subscapularis tendon plays an essential role in shoulder function. Although subscapularis tendon tears are less common than other rotator cuff tears, tears of the subscapularis tendon have increasingly been recognized with the advent of magnetic resonance imaging and arthroscopy. A suture bridge technique for the treatment of posterosuperior rotator cuff tears has provided the opportunity to improve the pressurized contact area and mean footprint pressure. However, suture bridge fixation of subscapularis tendon tears appears to be technically challenging. We describe an arthroscopic surgical technique for suture bridge repair of subscapularis tendon tears that obtains ideal cuff integrity and footprint restoration. Surgery using such a suture bridge technique is indicated for large tears, such as tears involving the entire first facet or more, tears with a disrupted lateral sling, and combined medium to large supraspinatus/infraspinatus tears. PMID:26052489

  11. The Bentong–Raub Suture Zone

    Microsoft Academic Search

    I. Metcalfe

    2000-01-01

    It is proposed that the Bentong–Raub Suture Zone represents a segment of the main Devonian to Middle Triassic Palaeo-Tethys ocean, and forms the boundary between the Gondwana-derived Sibumasu and Indochina terranes. Palaeo-Tethyan oceanic ribbon-bedded cherts preserved in the suture zone range in age from Middle Devonian to Middle Permian, and mélange includes chert and limestone clasts that range in age

  12. The history and evolution of sutures in pelvic surgery

    PubMed Central

    Muffly, Tyler M; Tizzano, Anthony P; Walters, Mark D

    2011-01-01

    Summary The purpose of the study is to review the history and innovations of sutures used in pelvic surgery. Based on a review of the literature using electronic- and hand-searched databases we identified appropriate articles and gynaecology surgical textbooks regarding suture for wound closure. The first documented uses of suture are explored and then the article focuses on the use of knotted materials in pelvic surgery. The development of suture of natural materials is followed chronologically until the present time where synthetic suture is implanted during countless surgeries every day. This millennial history of suture contains an appreciation of the early work of Susruta, Celsus, Paré and Lister, including a survey of some significant developments of suture methods over the last 100 years. Most surgeons know little about the history and science of sutures. A retrospective view of suture is critical to the appreciation of the current work and development of this common tool. PMID:21357979

  13. The Role of Thyroid Eye Disease and Other Factors in the Overcorrection of Hypotropia Following Unilateral Adjustable Suture Recession of the Inferior Rectus (An American Ophthalmological Society Thesis)

    PubMed Central

    Kerr, Natalie C.

    2011-01-01

    Purpose Overcorrection of hypotropia subsequent to adjustable suture surgery following inferior rectus recession is undesirable, often resulting in persistent diplopia and reoperation. I hypothesized that overcorrection shift after suture adjustment may be unique to thyroid eye disease, and the use of a nonabsorbable suture may reduce the occurrence of overcorrection. Methods A retrospective chart review of adult patients who had undergone eye muscle surgery with an adjustable suture technique was performed. Overcorrection shifts that occurred between the time of suture adjustment and 2 months postoperatively were examined. Descriptive statistics, linear regression, Anderson-Darling tests, generalized Pareto distributions, odds ratios, and Fisher tests were performed for two overcorrection shift thresholds (>2 and >5 prism diopters [PD]). Results Seventy-seven patients were found: 34 had thyroid eye disease and inferior rectus recession, 30 had no thyroid eye disease and inferior rectus recession, and 13 patients had thyroid eye disease and medial rectus recession. Eighteen cases exceeded the 2 PD threshold, and 12 exceeded the 5 PD threshold. Statistical analyses indicated that overcorrection was associated with thyroid eye disease (P=6.7E-06), inferior rectus surgery (P=6.7E-06), and absorbable sutures (>2 PD: OR=3.7, 95% CI=0.4–35.0, P=0.19; and >5 PD: OR=6.0, 95% CI=1.1–33.5, P=0.041). Conclusions After unilateral muscle recession for hypotropia, overcorrection shifts are associated with thyroid eye disease, surgery of the inferior rectus, and use of absorbable sutures. Surgeons performing unilateral inferior rectus recession on adjustable suture in the setting of thyroid eye disease should consider using a nonabsorbable suture to reduce the incidence of postoperative overcorrection. PMID:22253487

  14. 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.

  15. Laparoscopic fascial suture repair of parastomal hernia

    PubMed Central

    Zia, Khawaja; McGowan, David Ross; Moore, Etienne

    2013-01-01

    Parastomal hernia is a recognised complication following stoma formation, representing a challenging problem to surgeons. At least three approaches for parastomal hernia repair have been described: fascial suture repair, relocation of stoma and local repair with use of mesh. In simple fascial suture repair only open techniques have been described. Relocation of stoma can be complicated with another parastomal hernia at the new site and risk of incisional hernia at the site of previous stoma. Mesh repair can be either open or laparoscopic. The recurrence rate and complications of parastomal hernia repair remain very high. We have invented a simple fascial suture laparoscopic repair of parastomal hernia with the use of the Crochet hook needle (EndoClose). This new technique may result in reduced pain, earlier discharge from hospital and reduced risk of infection as there is no mesh used as well as reduced risk of seroma formation. PMID:23780775

  16. Patellar tendon repair with suture anchors using a combined suture technique of a Krackow-Bunnell weave.

    PubMed

    Gaines, Robert J; Grabill, Scott E; DeMaio, Marlene; Carr, Donald

    2009-01-01

    Suture repair of the ruptured patellar tendon is the treatment of choice for patients requiring operative management. This standard technique includes fixation through transosseous tunnels in the patella. The use of suture anchor fixation has several advantages over the standard approach, including less dissection, decreased surgical time, more accurate suture placement, and a low-profile construct. Additionally, the pullout strength of suture anchors warrants consideration of this technique in these repairs. This article describes using suture anchors for repair of the acute ruptured patellar tendon with a combination of Krackow and Bunnell sutures. PMID:19104306

  17. 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.

  18. Suture needles in Oral Surgery: Alterations depending on the type and number of sutures

    PubMed Central

    Barranco-Piedra, Sebastian; Rodríguez-Caballero, Angela; Serrera-Figallo, María-Angeles; Segura-Egea, Juan-José; Gutiérrez-Pérez, José-Luis

    2012-01-01

    This study examined whether the number and type of sutures used in oral surgery influence two ad hoc variables (incision plane and displaced area), which are two variables related to whether the suture needle is suitable for the task. Seventy-five TB-15 needles were studied, which were used to suture between zero and three mucosa and/subperiosteal sutures, producing 15 groups with 5 needles in each one. The incision plane and displaced area were measured for each group, which are two variables related to how the needle has worn and altered. Statistical treatment was conducted using the Kruskal-Wallis H test to compare multiple values and the Mann-Whitney U test to compare pairs. A multi-stage regression model was applied with the aim of predicting the changes in the dependent variables based on the number and type of sutures performed. The incision plane ranged from 126.67 to 346.24?m among the different groups. The displaced area was measured as being between 14 524.83?m² and 128 311.91?m². The best predictive model for the incision plane obtained a coefficient of determination (R2) of 0.149, while it reached 0.249 for the displaced area. Subperiosteal sutures held more weighting among the variables studied. Mucosal sutures did not seem to greatly affect needle wear. Observations reported in this paper indicate that the needle should be changed after having performed two subperiosteal sutures, given the wear and change to the incision plane that is produced, which causes the needle’s cutting ability to reduce. Key words: Needles, sutures, material testing, oral surgery, third molar, scanning electron microscope. PMID:22157669

  19. Neogene sutures in eastern Indonesia R. Hall*, M.E.J. Wilson1

    E-print Network

    Royal Holloway, University of London

    . These are the Molucca, Sorong, Sulawesi, Banda and Borneo sutures. Each of these sutures has a relatively short history. These are the Molucca, Sorong, Sulawesi, Banda and Borneo sutures (Fig. 2). The Borneo Suture is situated

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

    E-print Network

    Jonnalagadda, Silpa P.

    2005-08-29

    Suture anchors have been used successfully in many applications in orthopedics. They have been in the forefront of research in the recent years. Most of the studies, though, have focused on human suture anchors. This research concentrates...

  1. Advances in Suture Material for Obstetric and Gynecologic Surgery

    PubMed Central

    Greenberg, James A; Clark, Rachel M

    2009-01-01

    Despite millennia of experience with wound closure biomaterials, no study or surgeon has yet identified the perfect suture for all situations. Tissue characteristics, tensile strength, reactivity, absorption rates, and handling properties should be taken into account when selecting a wound closure suture. This review discusses the wound healing process and the biomechanical properties of currently available suture materials to better understand how to choose suture material in obstetrics and gynecology. PMID:19826572

  2. [Results of a controlled trial comparing 3 suture threads at slow resorption for the closure of supra-umbilical midline laparotomies].

    PubMed

    Bresler, L; Courbey, P J; Feldman, L; Bilweiss, J; Tortuyaux, J M; Rauch, P; Boissel, P; Grosdidier, J

    1995-01-01

    A randomized prospective trial was carried out between September 1987 and February 1989 to compare 3 different absorbable sutures (polyglactine 910, polydioxanone I, polydioxanone II) for closure of the abdominal wall after upper midline laparotomy for elective operations. The technique used to close the fascia was always a continuous suture. The criteria used to assess the results were the development of wound infection and wound dehiscence in the early postoperative period, and the development of suture sinuses and incisional hernia 1 year after operation. The early postoperative results in 235 patients revealed no wound infection and no -wound dehiscence. Suture sinuses developed in 4 patients (2%) 2 months after operation, but resolved spontaneously. We reviewed 203 patients after one year. The total number of incisional hernias detected 1 year postoperatively was 22 cases (11%), (polyglactine 910, 14.2%; polydioxanone I, 11.2%; polydioxanone II, 8.4%). The difference between the 3 groups was not statistically significant. The results of the trial indicate that absorbable sutures have a very low incidence of suture sinuses, and that polydioxanone II seems to be a good choice for closing laparotomies. PMID:8526449

  3. Repair of quadriceps tendon ruptures using suture anchors

    Microsoft Academic Search

    David P. Richards; F. Alan Barber

    2002-01-01

    The repair of ruptured quadriceps tendon is commonly performed by weaving sutures through the ruptured tendon and then attaching the tendon to the bone by passing these sutures through tunnels in the superior patella. This technical note is the first report we are aware of in the English language literature of a technique that uses suture anchors to attach the

  4. 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

  5. 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

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

    PubMed Central

    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

  7. [Secondary intraocular lens implantation using scleral suture fixation].

    PubMed

    Szurman, P; Gekeler, K

    2014-03-01

    Scleral suture fixation is one of several techniques used for secondary lens implantation in cases of inadequate capsular support for which many variations have been published. A transscleral suture can be accomplished using either an external or internal approach. The lens can be implanted using an injector with large incisions for unfolding lenses or also via small self-sealing incisions. Episcleral fixation of the suture can be accomplished by protecting the knot under scleral flaps, intrascleral rotation of the knot and using sclerocorneal pockets or scleral grooves. The intrascleral Z-suture with five intrascleral passes of the suture is a knotless technique providing several advantages. PMID:24549682

  8. Prostaglandin E1 in lipid microspheres ameliorates diabetic peripheral neuropathy: clinical usefulness of Semmes–Weinstein monofilaments for evaluating diabetic sensory abnormality

    Microsoft Academic Search

    Hiroshi Akahori; Toshinari Takamura; Tetsuo Hayakawa; Hitoshi Ando; Haruhisa Yamashita; Ken-ichi Kobayashi

    2004-01-01

    We investigated the effect of Prostaglandin E1 in lipid microspheres (Lipo-PGE1) on diabetic peripheral neuropathy from view of symptoms, neurological examinations including sensory threshold evaluated with Semmes–Weinstein monofilaments (SWM). Type 2 diabetic patients with diabetic peripheral neuropathy were participated in this study. The patients were randomly assigned to two groups, 11 Lipo-PGE1-treated patients and 16 control patients. Lipo-PGE1 at a

  9. The in-vitro assessment of a Collagen\\/Vicryl (Polyglactin) composite film together with candidate suture materials for potential use in urinary tract surgery

    Microsoft Academic Search

    C. G. Gemmell; S. D. Gorham; M. J. Monsour; F. McMillan; R. Scott

    1988-01-01

    A Collagen\\/Vicryl (Polyglactin) composite membrane (developed for use in urinary tract surgery) has been incubated in cultures of radioactively labelled urinary tract pathogens vis Escherichia coli, Staphylococcus epidermidis, and Proteus mirabilis for up to 1h. For comparison, collagen film, Vicryl mesh, and a number of absorbable and nonabsorbable sutures were similarly tested. Following incubation, samples were also examined by scanning

  10. Twist is required for establishment of the mouse coronal suture.

    PubMed

    Yoshida, Toshiyuki; Phylactou, Leonidas A; Uney, James B; Ishikawa, Isao; Eto, Kazuhiro; Iseki, Sachiko

    2005-05-01

    Cranial sutures are the growth centres of the skull, enabling expansion of the skull to accommodate rapid growth of the brain. Haploinsufficiency of the human TWIST gene function causes the craniosynostosis syndrome, Saethre-Chotzen syndrome (SCS), in which premature fusion of the coronal suture is a characteristic feature. Previous studies have indicated that Twist is expressed in the coronal suture during development, and therefore that it may play an important role in development and maintenance of the suture. The Twist-null mouse is lethal before the onset of osteogenesis, and the heterozygote exhibits coronal suture synostosis postnatally. In this study we investigated the function of Twist in the development of the mouse coronal suture, by inhibiting Twist synthesis using morpholino antisense oligonucleotides in calvarial organ culture. Decreased Twist production resulted in a narrow sutural space and fusion of bone domains within 48 h after the addition of the morpholino oligonucleotides. Proliferation activity in the sutural cells was decreased, and the expression of osteogenic marker genes such as Runx2 and Fgfr2 was up-regulated in the developing bone domain within 4 h. These results suggest that during establishment of the suture area, Twist is required for the regulation of sutural cell proliferation and osteoblast differentiation. PMID:15857364

  11. Mechanics of cranial sutures during simulated cyclic loading.

    PubMed

    Jasinoski, S C; Reddy, B D

    2012-07-26

    Previous computational and experimental analyses revealed that cranial sutures, fibrous joints between the bones, can reduce the strain experienced by the surrounding skull bones during mastication. This damping effect reflects the importance of including sutures in finite element (FE) analyses of the skull. Using the FE method, the behaviour of three suture morphologies of increasing complexity (butt-ended, moderate interdigitated, and complex interdigitated) during static loading was recently investigated, and the sutures were assumed to have linear elastic properties. In the current study, viscoelastic properties, derived from published experimental results of the nasofrontal suture of young pigs (Sus scrofa), are applied to the three idealised bone-suture models. The effects of suture viscoelasticity on the stress, strain, and strain energy in the models were computed for three different frequencies (corresponding to periods of 1, 10, and 100s) and compared to the results of a static, linear elastic analysis. The range of applied frequencies broadly represents different physiological activities, with the highest frequency simulating mastication and the lowest frequency simulating growth and pressure of the surrounding tissues. Comparing across all three suture morphologies, strain energy and strain in the suture decreased with the increase in suture complexity. For each suture model, the magnitude of strain decreased with an increase in frequency, and the magnitudes were similar for both the elastic and 1s frequency analyses. In addition, a viscous response is less apparent in the higher frequency analyses, indicating that viscous properties are less important to the behaviour of the suture during those analyses. The FE results suggest that implementation of viscoelastic properties may not be necessary for computational studies of skull behaviour during masticatory loading but instead might be more relevant for studies examining lower frequency physiological activities. PMID:22703899

  12. Understanding the logic of common suturing techniques in dermatologic surgery.

    PubMed

    Yazdani Abyaneh, Mohammad-Ali; Levitt, Jacob O

    2015-01-01

    Although most trainees in dermatology learn that different suturing techniques are designated for a specific purpose (i.e., certain functional and cosmetic outcomes), students often have a difficult time visualizing how a given suture functions in its designated capacity. In this article, we address the logic behind the most common suturing techniques in dermatologic surgery, including the direction and magnitude of their pulling force with respect to the wound edges and the ensuing displacement of dermal and epidermal structures. To aid better understanding, we diagram the vectors of suture force with each of the techniques discussed. PMID:26158359

  13. 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

  14. [A comparative assessment of modern suture materials in stomach resection].

    PubMed

    Korotkov, N I; Efremov, A V; Bo?tsov, N I

    2002-01-01

    Results of stomach resection by Bilrot-II in 30 experimental animals and 369 patients with gastric and duodenal ulcers were analyzed. Gastroenteroanastomoses were created with various sutures: capron, polysorb, titanium clips. Pneumopression, bacteriologic and morphologic examinations of anastomosis, fibroesophagogastroduodeno- and intestinoscopy, peripheral computed electrogastroenterography were used. It was revealed that mechanical suture with titanium clips was the best. Polysorb thread is inferior in tissue reaction to mechanical suture but superior to capron. Use of polysorb reduced rate of complications in immediate postoperative period 4 times. Taking into consideration high cost of suture devices it is reasonable to introduce polysorb in practice of abdominal surgery. PMID:12501460

  15. Suture locking of isolated internal locking knotless suture anchors is not affected by bone quality

    PubMed Central

    Woodmass, Jarret M; Matthewson, Graeme; Ono, Yohei; Bois, Aaron J; Boorman, Richard S; Lo, Ian KY; Thornton, Gail M

    2015-01-01

    Purpose The purpose of this study was to evaluate the mechanical performance of different suture locking mechanisms including: i) interference fit between the anchor and the bone (eg, 4.5 mm PushLock, 5.5 mm SwiveLock), ii) internal locking mechanism within the anchor itself (eg, 5.5 mm SpeedScrew), or iii) a combination of interference fit and internal locking (eg, 4.5 mm MultiFIX P, 5.5 mm MultiFIX S). Methods Anchors were tested in foam blocks representing normal (20/8 foam) or osteopenic (8/8 foam) bone, using standard suture loops pulled in-line with the anchor to isolate suture locking. Mechanical testing included cyclic testing for 500 cycles from 10 N to 60 N at 60 mm/min, followed by failure testing at 60 mm/min. Displacement after 500 cycles at 60 N, number of cycles at 3 mm displacement, load at 3 mm displacement, and maximum load were evaluated. Results Comparing 8/8 foam to 20/8 foam, load at 3 mm displacement and maximum load were significantly decreased (P<0.05) with decreased bone quality for anchors that, even in part, relied on an interference fit suture locking mechanism (ie, 4.5 mm PushLock, 5.5 mm SwiveLock, 4.5 mm MultiFIX P, 5.5 mm MultiFIX S). Bone quality did not affect the mechanical performance of 5.5 mm SpeedScrew anchors which have an isolated internal locking mechanism. Conclusion The mechanical performance of anchors that relied, even in part, on interference fit were affected by bone quality. Isolated internal locking knotless suture anchors functioned independently of bone quality. Anchors with a combined type (interference fit and internal locking) suture locking mechanism demonstrated similar mechanical performance to isolated internal locking anchors in osteopenic foam comparing similar sized anchors. Clinical relevance In osteopenic bone, knotless suture anchors that have an internal locking mechanism (isolated or combined type) may be advantageous for secure tendon fixation to bone. PMID:26124683

  16. Structural grafts and suture techniques in functional and aesthetic rhinoplasty

    PubMed Central

    Gassner, Holger G.

    2011-01-01

    Rhinoplasty has undergone important changes. With the advent of the open structure approach, requirements for structural grafting and direct manipulation of the cartilaginous skeleton through suture techniques have increased substantially. The present review analyzes the current literature on frequently referenced structural grafts and suture techniques. Individual techniques are described and their utility is discussed in light of available studies and data. PMID:22073105

  17. Electrospun Drug-Eluting Sutures for Local Anesthesia

    PubMed Central

    Weldon, Christopher B.; Tsui, Jonathan H.; Shankarappa, Sahadev A.; Nguyen, Vy T.; Ma, Minglin; Anderson, Daniel G.; Kohane, Daniel S.

    2012-01-01

    We have developed a local anesthetic-eluting suture system which would combine the function and ubiquity of the suture for surgical repair with the controlled release properties of a biodegradable polymeric matrix. Drug-free and drug-loaded poly(lactic-co-glycolic acid) (PLGA) sutures were fabricated by electrospinning, with or without the local anesthetic bupivacaine. The tensile strength of the electrospun sutures decreased as drug content increased, but strains remained relatively similar across all groups. Sutures released their entire drug payload over the course of 12 days and maintained approximately 12% of their initial tensile strength after 14 days of incubation in vitro. In a rat skin wound model, local analgesia was achieved 1 day after surgery and lasted approximately 1 week in 90% of treated animals (n = 10, p < 0.05), and all wounds were able to heal normally without the need for further reinforcement. The sutures caused tissue reaction in vivo that was comparable to that seen with a commercially available suture composed of PLGA. Such sutures may enhance perioperative analgesia and mitigate the need for standard postoperative opioid analgesics. PMID:22609349

  18. Adjustable sutures in eyelid surgery for ptosis and lid retraction

    Microsoft Academic Search

    J R Collin; B A ODonnell

    1994-01-01

    New techniques are described and illustrated for ptosis and lid retraction surgery in which the sutures holding the upper eyelid position are adjustable postoperatively. In the anterior approach, the sutures pass from the levator muscle through the anterior surface of the tarsal plate at the position of the skin crease and are tied at the skin crease incision. In the

  19. 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

  20. Laparoscopic Myomectomy with Aquadissection and Barbed Sutures

    PubMed Central

    Modi, Rajesh

    2011-01-01

    The objective of this study was to evaluate the efficacy of aquadissection technique to reduce the blood loss in myomectomy and to assess the benefits and feasibility of the use of barbed suture for myometrial defect closure. Vasopressin is diluted with saline as 10 units of vasopressin for every 100 ml of saline. For a fibroid of about 8 cm size, 40 units of vasopressin is diluted in 400 ml of normal saline. The whole of 400 ml of this saline is injected in the myometrium. Incision is made on the uterus with just simple scissors (no energy source is required). As the uterus is cut, instead of bleeding, saline leakage takes place. This helps to keep the field clear and it is easier to get the correct plane between the fibroid and the myometrium. The separation of the fibroid is helped due to the dissection of the correct plane by the saline injection. PMID:22442536

  1. 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

  2. Microbiological Evaluation of Suture Items Before Radiation Sterilization

    PubMed Central

    Österberg, Bertil O.

    1973-01-01

    Microbiological contamination levels of suture samples taken at various stages of the manufacturing process in a new hygienically controlled plant were determined by employing a membrane filturation technique. Both raw material and materials handled manually in the production process were tested to assess the effect of manual handling on the product contamination level. Evaluation of the efficacy of contamination control, however, was directed primarily to the finished, packaged products, just prior to the processing with cobalt 60. The suture material for testing was divided into two groups, namely, wet and dry products, the wet being packaged in a special „tubing” fluid consisting mainly of isopropyl alcohol. Initial contamination results are reported as the average of values obtained on the test day and the preceding 9 consecutive production days. A total of 1,787 suture samples tested in the dry group showed daily averages varying between 2.1 and 14.8 contaminants per suture. The 2,980 wet-packaged suture samples tested gave daily averages varying from 0.7 to 4.2 contaminants per suture. The highest values obtained for an individual suture were 400 for the dry and 89 for the wet. Identification studies of the contaminants revealed that fungi predominated. Most of the bacterial contaminants proved to be spore-forming rods. PMID:4751791

  3. New, innovative packaging system for surgical sutures and needles.

    PubMed

    Edlich, R F; Pavlovich, L J; Towler, M A; Thacker, J G; Rodeheaver, G T

    1993-01-01

    A new, innovative packaging system for surgical needles and sutures has been developed that meets the special needs of emergency physicians, surgeons, and operating personnel. This packaging system consists of an overwrap, or breather pouch, as well as an innerwrap containing the needle swaged to a surgical suture. The flaps of the overwrap are offset and serrated to facilitate the opening and sterile transfer of the inner packet to the sterile field. The inner packet contains either a plastic labyrinth or craft board that maintains the suture as straight as possible until knot construction. The needle swaged to a suture is parked in foam to protect its sharp cutting edges and point. PMID:8445188

  4. Dyspareunia from auto suture staples. A report of two cases.

    PubMed

    Messitt, J J

    1977-03-01

    The use of Auto Suture staples for closure of the vaginal vault after abdominal hysterectomy may result in postoperative dyspareunia and urinary urgency. Two cases are reported in which these complications occurred. PMID:840468

  5. 21 CFR 870.3460 - Endovascular Suturing System.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...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...

  6. 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...

  7. 21 CFR 870.3460 - Endovascular Suturing System.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...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...

  8. 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

  9. 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

  10. 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.

  11. Accelerating Bone Generation and Bone Mineralization in the Interparietal Sutures of Rats Using an rhBMP-2/ACS Composite after Rapid Expansion

    PubMed Central

    Lai, Ren-Fa; Zhou, Zhi-Ying; Chen, Tie

    2013-01-01

    This study aims to investigate the effects of rhBMP-2/ACS composite on bone regeneration and mineralization during expansion of the interparietal suture in rats. Forty 10-week-old Sprague-Dawley rats were divided into four groups (n=10). The first group (intact group) did not receive any intervention. The second group (expansion control group) received an expansion force of 60 g. The remaining two groups received an expansion force of 60 g and were implanted with an atelo-type I absorbable collagen sponge and rhBMP-2/ACS composite positioned on the suture beneath the periosteum. The relapse, relapse ratio, relevant bone remodelling, and calcium and osteocalcin contents were evaluated. Bone regeneration in the interparietal suture was estimated by the histological method. The osteocalcin content was measured by radioimmunoassay, and the calcium content was measured by atomic absorption spectrophotometry. Bone regeneration was more active in the suture after application of the expansion force compared with that of the suture without any intervention. Bone bridges formed in the rhBMP-2/collagen composite group. Both osteocalcin and calcium content were higher in the rhBMP-2/collagen composite group than in the other three groups (P<0.01). The relapse ratio in the rhBMP-2/collagen group was much lower than that in the other two expansion groups (P<0.01). RhBMP-2/ACS composite can promote bone regeneration and bone mineralization in the expanded suture and decrease the relapse ratio. Thus, the rhBMP-2/ACS composite may be therapeutically beneficial to the inhibition of relapse and shortening of the retention period during rapid expansion. PMID:23903053

  12. 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

  13. Large Vertical Axis Rotations along Neotethyan Sutures in TURKEY

    NASA Astrophysics Data System (ADS)

    Ozkaptan, M.; Gulyuz, E.; Kaymakci, N.; Langereis, C. G.; Ozacar, A. A.; Lefebvre, C.

    2014-12-01

    Two Neotethyan Sutures,Izmir-Ankara and Intra-Tauride suture zones meet around Ankara region appx. at right angles.The northerly located Izmir-Ankara Suture zone follows approximately E-W trend and it makes a sharp approximately 90° bend at the east along the western margin of the Çankiri Basin.The Intra-Tauride suture follows approximately the Tuzgölü Fault Zone and trends NW-SE and seems to be overprinted by the structures related to the Izmir-Ankara suture zone. These two sutures meet southeastern corner of the Haymana Basin where the basin makes major eastwards counterclockwise bend.From west to East, the Haymana, Tuzgölü and Çankiri Basins straddle these suture zones and are developed in relation to the subduction and collision processes in the region, making them the perfect sites to unravel deformation history and paleogeography of the Neotethyan suture zones in the region. In order to accomplish this, the tectono-stratigraphic evolution of the basin and its paleogeographical positions, in different time slices, constructed by conducting a very detailed study on the Late Cretaceous to Recent infill of the Haymana, Tuzgölü, and Çankiri Basins. We collected more than 4500 sedimentary paleomagnetic samples for paleomagnetic purposes from 112 different locations within 250 km diameter area.Before the demagnetization process, nearly 3000 core specimens were measured for anisotropy of magnetic susceptibility (AMS) in order to understand deformation amounts and kinematics.The paleomagnetic results show that the region underwent strong clockwise and counterclockwise rotations more than 90° in places, resulting in the present geometry of the suture zones. The central part of the Haymana basin rotated as high as 90° counterclockwise while its northern part together with the southwestern part of the Çankiri basin and northern part of the Tuzgölü basin rotated approximately 30° clockwise contrary to almost all published paleomagnetic data from the region.The restored orientations based on this new paleomagnetic data indicate that Haymana, Tuzgölü Basin and the SW margin of the Çankiri basins were initially oriented N-S prior to Eocene.These results indicate that the most of the paleogeographical maps and evolutionary scenarios and models of the region requires major re-thinking and serious revisions.

  14. Mechanical Behavior of Bio-inspired Model Suture Joints

    NASA Astrophysics Data System (ADS)

    Li, Yaning; Lin, Erica; Ortiz, Christine; Boyce, Mary

    2012-02-01

    Suture joints of varying degrees of geometric complexity are prevalent throughout nature as a means of joining structural elements while providing locally tailored mechanical performance. Here, micromechanical models of general trapezoidal waveforms of varying hierarchy are formulated to reveal the role of geometric complexity in governing stiffness, strength, toughness and corresponding deformation and failure mechanisms. Physical constructs of model composite suture systems are fabricated via multi-material 3D printing (Object Connex500). Tensile tests are conducted on samples covering a range in geometry, thus providing quantitative measures of stiffness, strength, and failure. The experiments include direct visualization of the deformation and failure mechanisms and their progression, as well as their dependence on suture geometry, showing the interplay between shear and tension/compression of the interfacial layers and tension of the skeletal teeth and the transition in failure modes with geometry. The results provide quantitative guidelines for the design and tailoring of suture geometry to achieve the desired mechanical properties and also facilitate understanding of suture growth and fusion, and evolutionary phenotype.

  15. 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.

  16. 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.

  17. Biomechanical evaluation of four different transosseous-equivalent\\/suture bridge rotator cuff repairs

    Microsoft Academic Search

    Michael Maguire; Jerome Goldberg; Desmond Bokor; Nicky Bertollo; Matthew Henry Pelletier; Wade Harper; William R. Walsh

    Purpose  Evaluate the biomechanical behavior of four variants of the transosseous-equivalent\\/suture bridge (TOE\\/SB) repair.\\u000a \\u000a \\u000a \\u000a Methods  Four suture bridge (SB) constructs were created using 24 sheep infraspinatus tendon-humerus constructs (n = 6 per technique). The groups were (1) Knotted Standard Suture Bridge (Standard SB)—suture bridge with two medial mattress\\u000a stitches, (2) Knotted Double Suture Bridge (Double SB)—four medial mattress stitches, (3) Untied Suture Bridge with

  18. Methods for absorbing neutrons

    DOEpatents

    Guillen, Donna P. (Idaho Falls, ID); Longhurst, Glen R. (Idaho Falls, ID); Porter, Douglas L. (Idaho Falls, ID); Parry, James R. (Idaho Falls, ID)

    2012-07-24

    A conduction cooled neutron absorber may include a metal matrix composite that comprises a metal having a thermal neutron cross-section of at least about 50 barns and a metal having a thermal conductivity of at least about 1 W/cmK. Apparatus for providing a neutron flux having a high fast-to-thermal neutron ratio may include a source of neutrons that produces fast neutrons and thermal neutrons. A neutron absorber positioned adjacent the neutron source absorbs at least some of the thermal neutrons so that a region adjacent the neutron absorber has a fast-to-thermal neutron ratio of at least about 15. A coolant in thermal contact with the neutron absorber removes heat from the neutron absorber.

  19. 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.

  20. Management of equine skull fractures using fixation with polydioxanone sutures.

    PubMed

    Schaaf, K L; Kannegieter, N J; Lovell, D K

    2008-12-01

    Ten horses presented with severe distortion of the facial contour, crepitus on palpation and mild to moderate epistaxis. Individual horses also showed ocular damage, ptosis, severe dyspnoea and movement of the facial bones concurrent with respiration. The fracture fragments were exposed using a large curvilinear incision and elevated using a retractor, periosteal elevator, chisel or Steinmann pin. The fracture fragments were unstable following reduction and fixation was necessary. Stabilisation was achieved with polydioxanone sutures placed through holes drilled in opposing sides of the fracture lines. Polydioxanone sutures provided good stability and had better handling properties than wire. There was good apposition of fracture edges and minimal complications. Use of polydioxanone sutures can also avoid the expense and complexity of plate fixation in selected cases, and should be considered as an alternative to fixation with stainless steel wire in any facial fracture that adjoins stable bone. PMID:19076771

  1. Hanging Bladder calculi Secondary to Misplaced Surgical Suture

    PubMed Central

    Mahdavi, Ali; Mostafavi, Hasan

    2015-01-01

    Bladder calculi, a rare condition in the pediatric population, occur most commonly as a result of either migration from the kidney or urinary stasis in the bladder. We report the case of a 3-year-old boy with recurrent urinary tract infections (UTI) secondary to bladder calculi formation on the sutures from a previous herniorrhaphy.A 3-year-old boy with previous history of herniorrhaphy presented with recurrent episodes of urinary tract infection, resistant to antibiotic therapy. Physical examination was unremarkable. Ultrasonography (US) showed an echogenic fixed intra-luminal lesion in the bladder. Cystoscopic evaluation was performed and confirmed presence of calculi forming around several permanent silk sutures fixed to the bladder wall. The patient undergone cystotomy and the calculi were resected. The stone analysis revealed 80% uric acid calculi. The final diagnosis was of bladder calculi due to remnant suture from past herniorrhaphy.

  2. 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

  3. Comparison of Surgical Outcomes according to Suturing Methods in Single Port Access Laparoscopic Myomectomy

    PubMed Central

    Jeong, Jae-Heok; Kim, Yu-Ri; Kim, Eun-Jeong; Moon, Soo-Hyeon; Park, Mi-Hwa; Kim, Jeong-Tae; Kim, Jeong-Hye

    2015-01-01

    Objectives This study was performed to consider the clinical experience of surgical outcome of single port access (SPA) laparoscopic myomectomy according to suturing methods. Methods The authors operated with 2 suturing method in SPA laparoscopic myomectomy for 246 patients and compared the surgical outcomes. Results The some significant difference of surgical outcome according to two suturing methods was demonstrated. Operating time was 100.50 minutes (± 42.09 minutes) in interrupted suture method group than 121.04 minutes (± 61.56 minutes) in continuous interlocking suture method group (P = 0.021). Estimated blood loss was less 222.59 mL (± 144.94 mL) in interrupted suture group than 340.11 mL (± 380.62 mL) in continuous interlocking suture method group (P = 0.042). Conclusion This experience suggests that interrupted suture method was effective for operating time and estimated blood loss than continuous interlocking method in SPA laparoscopic myomectomy.

  4. Endotracheal tube fixation methods for optimal stability: a comparison of adhesive tape, suture, and tape-suture fixation.

    PubMed

    Farbod, Frank; Tuli, Puneet; Robertson, Bernard F; Jackson, Ian T

    2010-07-01

    Accidental extubation of an intubated patient is a serious consideration in the surgical patient. Adequate fixation in the intubated patient is essential to prevent potentially life-threatening complications. Several methods of endotracheal tube fixation have been described in the literature. In this study, we examine 3 common methods of fixation: adhesive tape alone, suture, and tape-suture. Testing occurred in a laboratory setting with 2 fresh cadavers. Endotracheal tubes were inserted, using the methods of fixation in question. We subjected each fixation technique to progressively increasing weight to determine which technique is most resistant to accidental removal. We found that fixation of the tube by combining tape around the tube with a suture through the tape is the best noninvasive technique of the 3 methods evaluated in cases where movement of the head is anticipated. PMID:20613600

  5. Dura mater secretes soluble heparin-binding factors required for cranial suture morphogenesis

    Microsoft Academic Search

    Lynne A. Opperman; Ralph W. Passarelli; Amber A. Nolen; Thomas J. Gampper; Kant Y. K. Lin; Roy C. Ogle

    1996-01-01

    Summary  Cranial sutures play a critical role in calvarial morphogenesis, serving as bone growth centers during skull enlargement.\\u000a Defective suture morphogenesis, resulting in premature osseous obliteration of sutures and their failure to function appropriately,\\u000a causes severe craniofacial anomalies. Previously published data demonstrated osseous obliteration of coronal suturesin vitro in the absence of dura mater and the rescue of sutures from osseous

  6. Active Absorbers M. Rousseaua

    E-print Network

    Paris-Sud XI, Université de

    the theory for a point active absorber immersed in the anechoic field from a point source. This will apply with a plane wave. An extra oscillatory interference term occurs which should largely cancel in rooms due to the varying distances between all the source images and the absorber. Responses were measured in several rooms

  7. Multispectral metamaterial absorber.

    PubMed

    Grant, J; McCrindle, I J H; Li, C; Cumming, D R S

    2014-03-01

    We present the simulation, implementation, and measurement of a multispectral metamaterial absorber (MSMMA) and show that we can realize a simple absorber structure that operates in the mid-IR and terahertz (THz) bands. By embedding an IR metamaterial absorber layer into a standard THz metamaterial absorber stack, a narrowband resonance is induced at a wavelength of 4.3 ?m. This resonance is in addition to the THz metamaterial absorption resonance at 109 ?m (2.75 THz). We demonstrate the inherent scalability and versatility of our MSMMA by describing a second device whereby the MM-induced IR absorption peak frequency is tuned by varying the IR absorber geometry. Such a MSMMA could be coupled with a suitable sensor and formed into a focal plane array, enabling multispectral imaging. PMID:24690713

  8. [Long-term animal experiment analysis of the use of resorbable staple sutures in partial gastrectomy].

    PubMed

    Walgenbach, S; Lang, U; Junginger, T

    1994-01-01

    In animal experiments with a 12-month follow-up, the safety and compatibility of absorbable staple lines following gastrointestinal surgery were analysed. In two groups of pigs, partial gastrectomies with gastroduodenostomy (Billroth I, n = 10) or gastrojejunostomy (Roux-en-Y, n = 12) were performed, and Lactomer-a copolymer of glycolic acid and lactic acid-staple lines were used for closure of the lesser curvature of the stomach and the duodenal stump. Application of the staple lines caused no problems and was safe. In 1 of the 22 pigs, which died of an ileus 9 days postoperatively a suture dehiscence (4.5%) at the lesser curvature of the stomach was observed. Macroscopic examination showed no major inflammation around the staples. Microscopically complete absorption of the Lactomer staples without extensive scarification in the gastrointestinal wall could be demonstrated 12 months postoperatively. Our results yielded no contraindications for the clinical use of absorbable staple lines in gastrointestinal surgery. The manufacturer has given advance notice of smaller staples, which it is considered will be an advantage. PMID:8145617

  9. Suture Anchor Repair of Quadriceps Tendon Rupture After Total Knee Arthroplasty

    Microsoft Academic Search

    Tae Won B. Kim; Atul F. Kamath; Craig L. Israelite

    2011-01-01

    Disruption of the extensor mechanism after total knee arthroplasty (TKA) is a devastating complication, usually requiring surgical repair. Although suture anchor fixation is well described for repair of the ruptured native knee quadriceps tendon, no study has discussed the use of suture anchors in quadriceps repair after TKA. We present an illustrative case of successful suture anchor fixation of the

  10. Lhasa block and bordering sutures- a continuation of a 500-km Moho traverse through Tibet

    Microsoft Academic Search

    Alfred Hirn; Alexandre Nercessian; Martine Sapin; Georges Jobert; Xu Zhong Xin; Gao En Yuan; Lu De Yuan; Teng Ji Wen

    1984-01-01

    A north-south wide-angle fan-profile through the Yarlung Zangbo suture, across the Lhasa block and through the Bangong-Nujiang suture shows several significant and sharp changes in crustal thickness. Both sutures appear as vertical 20-km steps in the Moho and may have been the loci for eastward strike-slip motion of the Tibetan lithosphere.

  11. Failure Mode of Suture Anchors as a Function of Insertion Depth

    Microsoft Academic Search

    C. Kelly Bynum; Steven Lee; Andrew Mahar; James Tasto; Robert Pedowitz

    2005-01-01

    Background: Surgeons can control not only the angle but also the depth of suture anchor placement during arthroscopic rotator cuff repair, although the tendency may be to place suture anchors on the deep side to avoid damage from prominent anchor eyelets. However, little information is available regarding possible effects of suture anchor depth on construct failure mechanisms.Hypothesis: Anchor depth affects

  12. A prospective comparison of abdominal hysterectomy using absorbable staples.

    PubMed

    Beresford, J M; Moher, D

    1993-06-01

    Forty-eight abdominal hysterectomies performed using Polysorb (United States Surgical Corporation) [corrected] absorbable staples were compared prospectively with 46 hysterectomies performed using a regular suture technique. The two groups were demographically similar and it was found that the time of operation (p = 0.001) and the amount of blood loss at operation was significantly reduced (p = 0.03). The incidence of granulations at the vaginal vault at six weeks was significantly reduced (p = 0.001) and return to activity (p = 0.02) and work (p = 0.01) were also significantly reduced for the patients who had a hysterectomy performed using Polysorb staples. There was no statistical difference in morbidity, complications, use of analgesics and period of hospitalization. The continued use of absorbable staples in abdominal hysterectomy is supported, related to the advantages that were statistically significant. PMID:8322128

  13. Use of Modified Tension Band Sutures for Fingernail Disruptions

    Microsoft Academic Search

    H. S. PATANKAR

    2007-01-01

    A series of 66 patients, aged between 1 and 70 years, with 70 disruptive injuries to finger nails was reviewed. The injuries were treated by cleaning of the finger, evacuation of haematoma and anatomical replacement of the nail plate, or a substitute, which was secured with a modified dorsal tension band suture without formal repair of the nail bed. K-wire

  14. Management of face lifts with progressive tension sutures

    Microsoft Academic Search

    Harlan Pollock; Todd Alan Pollock

    2003-01-01

    Background: Performance of deepr and more extensive dissections in face lift procedures has led to more complex procedures, a higher rate of reported complications, and more prolonged convalescence.Objective: We investigated the use of progressive tension sutures (PTSs) to achieve more controlled, safe, and secure skin flap management and improved aesthetic results.Methods: Defatting of the neck was performed by lipoplasty or

  15. Risk Factors for Mesh/Suture Erosion Following Sacrocolpopexy

    PubMed Central

    Cundiff, Geoffrey W.; Varner, Edward; Visco, Anthony G.; Zyczynski, Halina M.; Nager, Charles W.; Norton, Peggy A.; Schaffer, Joseph; Brown, Morton B.; Brubaker, Linda

    2008-01-01

    Objectives To identify risks for mesh/suture erosions following sacrocolpopexy (ASC). Study Design We analyzed demographic, perioperative variables and erosion status in 322 participants in the Colpopexy and Urinary Reduction Efforts study two years after sacrocolpopexy. Results The predominant graft used was synthetic mesh; Mersilene (42%) or Polypropylene (48%). Twenty subjects (6%) experienced mesh/suture erosion. Unadjusted risk factors for mesh/suture erosion were expanded polytrafluroethylene (ePTFE) mesh (ePTFE 4/21 (19%) versus non-ePFTE 16/301 (5%): OR 4.2), concurrent hysterectomy (OR 4.9) and current smoking (OR 5.2). Of those with mesh erosion, most affected women (13/17) underwent at least one surgery for partial or total mesh removal. Two were completely resolved, 6 had persistent problems and 5 were lost to follow-up. No resolution was documented in the 4 women who elected observation. Conclusions Expanded PTFE mesh should not be used for sacrocolpopexy. Concurrent hysterectomy and smoking are modifiable risks for mesh/suture erosion. PMID:18976976

  16. Arthroscopic transglenoid suture repair for initial anterior shoulder dislocation

    Microsoft Academic Search

    Harald Boszotta; Walther Helperstorfer

    2000-01-01

    Purpose: To evaluate the long-term results after arthroscopic transglenoid suture repair for initial anterior shoulder dislocation. Type of Study: Outcome study. Materials and Methods: Selection for surgery was based on the sporting ambitions of the patients and the documentation of instability. Evidence of instability included the sonographic documentation of ventral drawer compared with the unaffected opposite shoulder as well as

  17. [The use of tantalum wire as a suture material].

    PubMed

    Brumme, S; Löwicke, G; Knöfler, W

    1989-01-01

    The qualification of tantalum wire as suture material was tested by means of physical and histological investigations. Starting-point were the physiochemical and biological attributes and its hitherto existing employment in the medicine. Indication and recommendations for handling the material were found out. PMID:2588749

  18. 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.

  19. Organo-Chlorinated Thin Films Deposited by Atmospheric Pressure Plasma-Enhanced Chemical Vapor Deposition for Adhesion Enhancement between Rubber and Zinc-Plated Steel Monofilaments.

    PubMed

    Vandenabeele, Cédric; Bulou, Simon; Maurau, Rémy; Siffer, Frederic; Belmonte, Thierry; Choquet, Patrick

    2015-07-01

    A continuous-flow plasma process working at atmospheric pressure is developed to enhance the adhesion between a rubber compound and a zinc-plated steel monofilament, with the long-term objective to find a potential alternative to the electrolytic brass plating process, which is currently used in tire industry. For this purpose, a highly efficient tubular dielectric barrier discharge reactor is built to allow the continuous treatment of "endless" cylindrical substrates. The best treatment conditions found regarding adhesion are Ar/O2 plasma pretreatment, followed by the deposition from dichloromethane of a 75 nm-thick organo-chlorinated plasma polymerized thin film. Ar/O2 pretreatment allows the removal of organic residues, coming from drawing lubricants, and induces external growth of zinc oxide. The plasma layer has to be preferably deposited at low power to conserve sufficient hydrocarbon moieties. Surface analyses reveal the complex chemical mechanism behind the establishment of strong adhesion levels, more than five times higher after the plasma treatment. During the vulcanization step, superficial ZnO reacts with the chlorinated species of the thin film and is converted into porous and granular bump-shaped ZnwOxHyClz nanostructures. Together, rubber additives diffuse through the plasma layer and lead to the formation of zinc sulfide on the substrate surface. Hence, two distinct interfaces, rubber/thin film and thin film/substrate, are established. On the basis of these observations, hypotheses explaining the high bonding strength results are formulated. PMID:26069994

  20. Screening patients at risk for diabetic foot ulceration: a comparison between measurement of vibration perception threshold and 10-g monofilament test.

    PubMed

    Richard, Jean-Louis; Reilhes, Lise; Buvry, Stéphanie; Goletto, Monique; Faillie, Jean-Luc

    2014-04-01

    The aim is to compare the frequency of increased vibration perception threshold (VPT) with abnormal 10-g Semmes-Weinstein monofilament (SWF) testing in a non-selected diabetic population, and to assess the agreement between these two screening methods. VPT was measured using a neurothesiometer at the pulp of the hallux and 10-g SWF was applied on three plantar sites on each foot according to the guidelines of the International Working Group on the Diabetic Foot, in 400 consecutive diabetic patients. VPT was considered as abnormal if ?25 V and SWF was considered as abnormal if the patient was unable to feel ?2 applications at a single site. Both tests were normal in 240 patients (60%) and both abnormal in 78. In 21 patients, only SWF was abnormal whereas only VPT was abnormal in 61. As a whole, 160 patients (40%) were considered at risk for foot ulceration by VPT and/or SWF. Agreement between the two screening methods was only moderate with a kappa coefficient of 0·52 (95% CI: 0·43-0·60). Using VPT as a predictor for foot ulceration, the number of patients at risk is much higher than identified by SWF. This discrepancy might have potential effects on costs and prevention policies. PMID:22892021

  1. A transducer for measuring force on surgical sutures

    PubMed Central

    Witte, Thomas H.; Cheetham, Jonathan; Rawlinson, Jeremy J.; Soderholm, L. Vince; Ducharme, Norm G.

    2010-01-01

    The objective of this study was to validate, both in vitro and in an ex vivo model, a technique for the measurement of forces exerted on surgical sutures. For this purpose, a stainless steel E-type buckle force transducer was designed and constructed. A strain gauge was mounted on the central beam of the transducer to measure transducer deformation. The transducer was tested and calibrated on a single strand of surgical suture during cyclic loading. Further validation was performed using a previously published cadaveric model of laryngoplasty in the horse. Linear regression of transducer output with actual force during calibration tests resulted in mean R2 values of 1.00, 0.99, and 0.99 for rising slope, falling slope, and overall slope, respectively. The R2 was not less than 0.96 across an average of 75 cycles per test. The difference between rising slope and falling slope was 4%. Over 45 846 samples, the predicted force from transducer output showed a mean error of 4%. In vitro validation produced an adjusted R2 of 0.99 when the force on the suture was regressed against translaryngeal pressure in a mixed-effects model. E-type buckle force transducers showed a highly linear output over a physiological force range when applied to surgical suture in vitro and in an ex vivo model of laryngoplasty. With appropriate calibration and short-term in vivo implantation, these transducers may advance our knowledge of the mechanisms of success and failure of techniques, such as laryngoplasty, that use structural suture implants. PMID:21197230

  2. [Primary suture following the bile duct exploration in cholelithiasis].

    PubMed

    Piecuch, Jerzy; Arendt, Jerzy; Gradzik, Robert; Rudzki, Marek; Sosada, Krystyn; Waniczek, Dariusz

    2004-01-01

    Classical performance of bile duct exploration is always strictly connected with the problem of an incised bile duct closure. In majority of surgical centers an external T-tube drainage was carried out in last century. But is an external drainage the best method to be used? The aim of the paper was to establish criteria for including (or excluding) patients to groups undergoing primary suture of bile duct. The comparison of the patients in whom bile duct exploration was followed by primary suture with the group in which T-tube was left in bile duct lumen was performed. Recently in our Department a classical method has been used to operate on 65 patients with cholelithiasis. In 42 patients a preoperatively planned bile duct exploration has been performed. In 14 patients a T-tube was left after the exploration, in 24 patients bile duct was closed with a primary suture. In other 18 patients with residual and recurrent bile duct stones T-tube was left in bile duct only in two patients. Based on literature analysis, our observations, and surgical experience criteria for including and excluding patients for primary suture of bile duct have been established. Groups of patients with and without T-tube were compared, considering complications and economic aspects of hospitalization. Our opinion is that whenever in specialized surgical centers detailed criteria are established and followed precisely, primary bile duct closure is a simple and safe procedure, responsible for few complications. The cost of hospitalization in the case of primary suture is half as much as the price of the hospitalization in the case of T-tube. PMID:15518068

  3. Evaluating the effectiveness of the lateral intercrural suture to decrease the interdomal distance to improve the definition of the nasal tip in primary rhinoplasty.

    PubMed

    Soares, Caio Márcio Correia; Mocelin, Marcos; Pasinato, Rogerio; Berger, Cezar Augusto Sarraf; Grocoske, Francisco Luiz Busato; Issa, Maria Julia Abrão

    2014-04-01

    Introduction?Several surgical techniques emphasizing sutures on the lower lateral cartilage have been studied by surgeons as instruments to improve nasal tip remodeling. It is already known that the domal divergence angle and its definition angle can be modified by lateral intercrural suture (LIS). Techniques for measuring these structures are not yet standardized. Objectives?Assess the efficacy of LIS using polydioxanone 4-0 absorbable thread by interdomal distance and systematize the LIS technique to improve nasal tip definition. Materials and Methods?This prospective study measured and analyzed interdomal distances measured preoperatively and perioperatively compared with 3- and 6-month postoperative measurements. Results?LIS was efficient on reducing interdomal distances. Conclusion?LIS is statistically safe and efficient and has low morbidity when utilized in patients with mild to moderate deformities, because it reduces the domal divergence angle, effectively sustaining the nasal tip. PMID:25992073

  4. Assessment of the role of sutures in a lizard skull: a computer modelling study

    PubMed Central

    Moazen, Mehran; Curtis, Neil; O'Higgins, Paul; Jones, Marc E.H; Evans, Susan E; Fagan, Michael J

    2008-01-01

    Sutures form an integral part of the functioning skull, but their role has long been debated among vertebrate morphologists and palaeontologists. Furthermore, the relationship between typical skull sutures, and those involved in cranial kinesis, is poorly understood. In a series of computational modelling studies, complex loading conditions obtained through multibody dynamics analysis were imposed on a finite element model of the skull of Uromastyx hardwickii, an akinetic herbivorous lizard. A finite element analysis (FEA) of a skull with no sutures revealed higher patterns of strain in regions where cranial sutures are located in the skull. From these findings, FEAs were performed on skulls with sutures (individual and groups of sutures) to investigate their role and function more thoroughly. Our results showed that individual sutures relieved strain locally, but only at the expense of elevated strain in other regions of the skull. These findings provide an insight into the behaviour of sutures and show how they are adapted to work together to distribute strain around the skull. Premature fusion of one suture could therefore lead to increased abnormal loading on other regions of the skull causing irregular bone growth and deformities. This detailed investigation also revealed that the frontal–parietal suture of the Uromastyx skull played a substantial role in relieving strain compared with the other sutures. This raises questions about the original role of mesokinesis in squamate evolution. PMID:18765341

  5. Closure of the rectus sheath with a continuous looped suture and the skin with staples in dogs: speed, safety, and costs compared to closure of the rectus sheath with interrupted sutures and the skin with a continuous subdermal suture.

    PubMed

    Kummeling, A; van Sluijs, F J

    1998-10-01

    In dogs requiring a midline celiotomy, closure of the rectus sheath with a continuous polyglyconate looped suture and closure of the skin with stainless steel staples (group 1, 20 dogs) were compared with closure of the rectus sheath with interrupted polyglyconate sutures and closure of the skin with a continuous subdermal polyglactin suture (group 2, 20 dogs) with respect to speed, safety, and costs. The subcutis was closed with a continuous polyglactin suture in all dogs. The use of a looped suture saved 3.4 minutes and the use of staples saved 5.6 minutes. Total mean time saved for all layers was 7.7 minutes (38%). Wound healing was not significantly different between group 1 and group 2. There was one case of dehiscence of the rectus sheath in group 2 and two cases of wound infection in group 1. It was concluded that closing the rectus sheath with a continuous looped suture and the skin with staples is equally safe and significantly faster than closing the rectus sheath with simple interrupted sutures and the skin with a continuous subdermal suture. Additional costs were balanced by the reduction in surgery time. PMID:9810626

  6. Experimentelle Untersuchungen zur Gefäßwandregeneration bei Verwendung eines neuen monofilen, resorbierbaren Nahtmaterials für arterielle Anastomosen

    Microsoft Academic Search

    Th. Schmitz-Rixen; S. Horsch; B. Klein; H. Pichlmaier

    1984-01-01

    Summary A new synthetic, absorbable suture has been tested on 15 mongrel dogs. A total of 132 simple end-to-end anastomoses has been performed in common carotid, iliac and femoral arteries and the aorta abdominalis with monofilament, absorbable polydioxanon. Aneurysms or infections did not occur. The patency rate up to 250 days was 98.5%. All vessels were studied by angiography and

  7. A Complication in Hypospadias Surgery Due to Anchoring Suture

    PubMed Central

    Gollu, Gulnur; Kucuk, Gonul; Karabulut, Ayse An?l; Yagmurlu, Aydin; Cakmak, Murat

    2015-01-01

    The complication rates are still 1–90% both in proximal and distal hypospadias regardless of the surgeon’s experience and the usage of most developed techniques. The literature survey revealed few complications of glans penis including meatal stenosis, prolapsus and retraction. Despite our literature survey, we could not find any article concerning the permanent scar tissue at the dorsal part of glans following hypospadias surgeries. A new complication can be added to these, concerning glans which is the formation of postoperative scar tissue as a reaction to suture material used in traction, stent anchoring or both. The aim of this paper is to demonstrate four cases which had glanular scar due to traction suture following the surgical procedures for hypospadias repair. PMID:26180503

  8. A Complication in Hypospadias Surgery Due to Anchoring Suture.

    PubMed

    Gollu, Gulnur; Kucuk, Gonul; Karabulut, Ayse An?l; Yagmurlu, Aydin; Cakmak, Murat

    2015-06-01

    The complication rates are still 1-90% both in proximal and distal hypospadias regardless of the surgeon's experience and the usage of most developed techniques. The literature survey revealed few complications of glans penis including meatal stenosis, prolapsus and retraction. Despite our literature survey, we could not find any article concerning the permanent scar tissue at the dorsal part of glans following hypospadias surgeries. A new complication can be added to these, concerning glans which is the formation of postoperative scar tissue as a reaction to suture material used in traction, stent anchoring or both. The aim of this paper is to demonstrate four cases which had glanular scar due to traction suture following the surgical procedures for hypospadias repair. PMID:26180503

  9. [In vitro study of Staphylococcus epidermidis adhesiveness to suture materials].

    PubMed

    Arciola, C R; Buscaroli, S; Rocca, M; Farinetti, A; Fini, M; Manfrini, M; Giardino, R

    1990-03-01

    In surgical divisions, where you can find the highest percentage of hospital infections, the surgical wounds are definitively the most frequent localization. The aim of our study was to evaluate whether bacterial-biomaterial interactions could influence the growth of infections in sutured tissues. We prepared a method for in vitro bacterial adhesiveness testing based on turbidimetric analysis. The results obtained show a different grade of bacterial adhesion in relation to physical and chemical characteristics of the material examined. PMID:2223484

  10. Deep electromagnetic soundings conducted in Trans-European Suture Zone

    Microsoft Academic Search

    Vladimir Yu. Semenov; Waldemar Jozwiak; Josef Pek

    2003-01-01

    A consortium of nine geophysical institutions recently carried out a large-scale geomagnetic experiment focused on revealing the deep electrical structure beneath central and eastern Europe around the Trans-European Suture Zone (TESZ), the region's first-order geological lineament. The TESZ is considered a broad zone of deformation that crosses all of Europe, from the British Isles in the northwest to the Black

  11. Parallel Tethyan sutures in mainland Southeast Asia: New insights for Palaeo-Tethys closure and implications for the Indosinian orogeny

    Microsoft Academic Search

    Masatoshi Sone; Ian Metcalfe

    2008-01-01

    Two contrasting parallel tectonic sutures can be recognised through the Yunnan–Thailand region of mainland Southeast Asia; they are sutures of the Devonian–Triassic Palaeo-Tethys Ocean and a Permian back-arc basin. The Changning–Menglian and Inthanon suture zones are regarded as the Palaeo-Tethys Suture Zone. The Jinghong–Nan–Sra Kaeo suture is regarded as a closed back-arc basin. The Sukhothai Zone is no longer treated

  12. 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

  13. 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.

  14. Mechanical energy absorber

    NASA Astrophysics Data System (ADS)

    Wesselski, Clarence J.

    1995-06-01

    An energy absorbing system for controlling the force where a moving object engages a stationary stop and where the system utilized telescopic tubular members, energy absorbing diaphragm elements, force regulating disc springs, and a return spring to return the telescoping member to its start position after stroking is presented. The energy absorbing system has frusto-conical diaphragm elements frictionally engaging the shaft and are opposed by a force regulating set of disc springs. In principle, this force feedback mechanism serves to keep the stroking load at a reasonable level even if the friction coefficient increases greatly. This force feedback device also serves to desensitize the singular and combined effects of manufacturing tolerances, sliding surface wear, temperature changes, dynamic effects, and lubricity.

  15. Mechanical energy absorber

    NASA Astrophysics Data System (ADS)

    Wesselski, Clarence J.

    1993-07-01

    An energy absorbing system for controlling the force where a moving object engages a stationary stop and where the system utilized telescopic tubular members, energy absorbing diaphragm elements, force regulating disc springs, and a return spring to return the telescoping member to its start position after stroking is presented. The energy absorbing system has frusto-conical diaphragm elements frictionally engaging the shaft and are opposed by a force regulating set of disc springs. In principle, this force feedback mechanism serves to keep the stroking load at a reasonable level even if the friction coefficient increases greatly. This force feedback device also serves to desensitize the singular and combined effects of manufacturing tolerances, sliding surface wear, temperature changes, dynamic effects, and lubricity.

  16. 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.

  17. 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. PMID:25848193

  18. Polypyrrole Based Microwave Absorbers

    Microsoft Academic Search

    V.-T. Truong; S. Z. Riddell; R. F. Muscat

    1998-01-01

    Reflection of microwave radiations from single layer and two-layer materials is calculated. Microwave absorbing materials are formulated by mixing a commercially available paint or rubber with the conducting polypyrrole (PPy) powder. The reflection loss strongly depends on thickness and complex permittivity of the material. For a single layer material, optimum values of the real part, ?', and imaginary part, ?'',

  19. Shock Absorbing Helmets

    NASA Technical Reports Server (NTRS)

    1978-01-01

    This paper presents a description of helmets used by football players that offer three times the shock-absorbing capacity of earlier types. An interior padding for the helmets, composed of Temper Foam, first used by NASA's Ames Research Center in the design of aircraft seats is described.

  20. Internal absorber solar collector

    Microsoft Academic Search

    S. B. Herskovitz; F. S. Holt; C. J. Sletten; E. J. Sletten

    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° in

  1. Internal absorber solar collector

    Microsoft Academic Search

    Carlyle J. Sletten; Sheldon B. Herskovitz; F. S. Holt; E. J. Sletten

    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

  2. Orientation of late Precambrian sutures in the Arabian-Nubian shield

    NASA Technical Reports Server (NTRS)

    Stern, Robert J.; Nielsen, Kent C.; Best, Eric; Sultan, Mohamed; Arvidson, Raymond E.

    1990-01-01

    Recent tectonic models have resulted in conflicting descriptions of how the late Precambrian sutures of the Arabian-Nubian shield extend into northeast Africa. The Hamisana shear zone in northeastern Sudan is critical to this discussion because it truncates and disrupts two sutures, the Allaqi-Heiani and the Onib-Sol Hamed. Analysis of field structural data, Thematic Mapper imagery, and Rb-Sr and U-Pb geochronology suggests that the Allaqi-Heiani suture is the western extension of the Onib-Sol Hamed suture and that both make up the exposed parts of a far-traveled, polydeformed ophiolitic nappe complex. Subsequent deformation localized in the Hamisana shear zone disrupted this nappe and displaced the suture between 660 and 550 Ma during regional deformation associated with the Najd fault system. These results indicate that at least one suture extends westward into the interior of northern Africa.

  3. Gene Expression Changes Between Patent and Fused Cranial Sutures in a Nonsyndromic Craniosynostosis Population

    PubMed Central

    Rhodes, Jennifer L.; Vega, Rafael A.; Ridder, Thomas; Shiang, Rita

    2015-01-01

    Objective: Craniosynostosis is a premature fusion of 1 or more cranial sutures. It may occur with additional morphological abnormalities (syndromic) or in isolation. Studies suggest that dysregulation of normal cell proliferation, differentiation, and migration has a role in isolated or nonsyndromic craniosynostosis but the molecular mechanisms remain unknown. The aim of this research is to identify genes differentially expressed in prematurely fused human suture compared to patent suture in nonsyndromic craniosynostosis. Methods: Bone fragments from synostosed and patent sutures of 7 infants with nonsyndromic craniosynostosis were collected during surgical release of fused sutures. RNA was isolated from the fragments (7 patent and 7 fused) and global gene expression profiled using the Illumina WGE-DASL assay and HumanRef 8.0 Beadchip. Results: Comparison of mRNA expression in fused and patent suture identified 68 genes significantly differentially expressed and having fold changes ? ?2.0 and ? 2.0 with a false discovery rate adjusted P value at .10 and 136 with adjusted P value of 0.15. SFRP2 (secreted frizzled-related protein 2) demonstrated the largest decrease in fused sutures. Analysis including only sagittal fused sutures revealed a set of 35 overlapping genes that may be involved in suture patency over all suture types. SPHKAP (sphingosine kinase type 1-interacting protein), a modulator of TGF? signaling, was significant in the sagittal subset. Conclusion: Differentially expressed genes were identified in fused suture relative to patent in a nonsyndromic craniosynostosis population. SFRP2 is likely important in suture patency. Genes having significant roles in osteoblastogenesis as negative regulators of canonical Wnt pathway were significantly downregulated. PMID:25987937

  4. Stratigraphy and structure of the Indus Suture in the Lower Swat, Pakistan, NW Himalaya

    Microsoft Academic Search

    R. Anczkiewicz; J.-P. Burg; S. S. Hussain; H. Dawood; M. Ghazanfar; M. N. Chaudhry

    1998-01-01

    We present a geological map, detailed structural description and new subdivisions of the Indus Suture Zone lithologies in northeast Pakistan (Lower Swat region). The Indus Suture Zone is a dominantly fore-arc related assemblage obducted onto the Indian Plate. Initial southward thrusting was followed by the reactivation of the Indus Suture as a ductile-brittle normal fault. Significant strike-slip faulting may have

  5. Suture anchor repair of quadriceps tendon rupture after total knee arthroplasty.

    PubMed

    Kim, Tae Won B; Kamath, Atul F; Israelite, Craig L

    2011-08-01

    Disruption of the extensor mechanism after total knee arthroplasty (TKA) is a devastating complication, usually requiring surgical repair. Although suture anchor fixation is well described for repair of the ruptured native knee quadriceps tendon, no study has discussed the use of suture anchors in quadriceps repair after TKA. We present an illustrative case of successful suture anchor fixation of the quadriceps mechanism after TKA. The procedure has been performed in a total of 3 patients. A surgical technique and brief review of the literature follows. Suture anchor fixation of the quadriceps tendon is a viable option in the setting of rupture after TKA. PMID:21397449

  6. Surgical Sutures Filled with Adipose-Derived Stem Cells Promote Wound Healing

    PubMed Central

    Reckhenrich, Ann Katharin; Kirsch, Bianca Manuela; Wahl, Elizabeth Ann; Schenck, Thilo Ludwig; Rezaeian, Farid; Harder, Yves; Foehr, Peter; Machens, Hans-Günther; Egaña, José Tomás

    2014-01-01

    Delayed wound healing and scar formation are among the most frequent complications after surgical interventions. Although biodegradable surgical sutures present an excellent drug delivery opportunity, their primary function is tissue fixation. Mesenchymal stem cells (MSC) act as trophic mediators and are successful in activating biomaterials. Here biodegradable sutures were filled with adipose-derived mesenchymal stem cells (ASC) to provide a pro-regenerative environment at the injured site. Results showed that after filling, ASCs attach to the suture material, distribute equally throughout the filaments, and remain viable in the suture. Among a broad panel of cytokines, cell-filled sutures constantly release vascular endothelial growth factor to supernatants. Such conditioned media was evaluated in an in vitro wound healing assay and showed a significant decrease in the open wound area compared to controls. After suturing in an ex vivo wound model, cells remained in the suture and maintained their metabolic activity. Furthermore, cell-filled sutures can be cryopreserved without losing their viability. This study presents an innovative approach to equip surgical sutures with pro-regenerative features and allows the treatment and fixation of wounds in one step, therefore representing a promising tool to promote wound healing after injury. PMID:24625821

  7. Molecular basis of cranial suture biology and disease: Osteoblastic and osteoclastic perspectives

    PubMed Central

    Beederman, Maureen; Farina, Evan M.; Reid, Russell R.

    2014-01-01

    The normal growth and development of the skull is a tightly regulated process that occurs along the osteogenic interfaces of the cranial sutures. Here, the borders of the calvarial bones and neighboring tissues above and below, function as a complex. Through coordinated remodeling efforts of bone deposition and resorption, the cranial sutures maintain a state of patency from infancy through early adulthood as the skull continues to grow and accommodate the developing brain's demands for expansion. However, when this delicate balance is disturbed, a number of pathologic conditions ensue; and if left uncorrected, may result in visual and neurocognitive impairments. A prime example includes craniosynostosis, or premature fusion of one or more cranial and/or facial suture(s). At the present time, the only therapeutic measure for craniosynostosis is surgical correction by cranial vault reconstruction. However, elegant studies performed over the past decade have identified several genes critical for the maintenance of suture patency and induction of suture fusion. Such deeper understandings of the pathogenesis and molecular mechanisms that regulate suture biology may provide necessary insights toward the development of non-surgical therapeutic alternatives for patients with cranial suture defects. In this review, we discuss the intricate cellular and molecular interplay that exists within the suture among its three major components: dura mater, osteoblastic related molecular pathways and osteoclastic related molecular pathways. PMID:25426492

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

    PubMed

    Goswami, A; Foley, L; Weisbecker, V

    2013-06-01

    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

  9. Sacrospinous Ligament Fixation Simplified with a New Endoscopic Suturing Device

    PubMed

    Papasakelariou

    1996-08-01

    This study evaluated the effectiveness of the EndoStitch during sacrospinous ligament fixation in 28 women, in combination with correction of other pelvic floor disorders. Application and retrieval of Surgidac (a coated and braided polyester suture) were performed in under 5 minutes without any complications. The patients were followed in terms of vaginal vault support, vaginal length, vaginal axis deviation, sexual discomfort when applicable, and bladder or rectal dysfunction. There was one failure. The technique was easy, safe, and easy to teach. PMID:9074209

  10. Iris mattress suture: a technique for sectoral iris defect repair.

    PubMed

    Tsao, Sean W; Holz, Huck A

    2015-03-01

    Achieving a cosmetic and functional outcome from iris defect repair is a surgical challenge. We describe an adaptation of techniques to address a case of 2.5 clock hours of sectoral iris tissue defect. Our method combines Siepser's modified closed-chamber sliding knot technique with the placement of a double-armed iris mattress suture to approximate iris tissue to the scleral wall and thereby create a pseudo-iris root. This technique reduces glare and achieves a cosmetic outcome for the patient. PMID:24879808

  11. Ionized Absorbers in AGN

    NASA Technical Reports Server (NTRS)

    Mathur, S.

    1999-01-01

    As a part of this program, we observed three AGN:PKS2251 + 113, PG0043 = 039 and PLH909. Two objects show signatures of absorbtion in their UV spectra. Based on our earlier modeling of X-ray warm absorbents, we expected to observe X-ray observation in these objects. The third, PLH909, is known to have soft excess in EINSTEIN data. Attachment: "Exploratory ASCA observation of broad absorption line quasi-stellar objects".

  12. 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.

  13. 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.

  14. 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

  15. Treatment of functional ventricular fold phonation by temporary suture lateralization.

    PubMed

    Friedrich, Gerhard; Kiesler, Karl; Gugatschka, Markus

    2010-09-01

    Ventricular fold phonation (VFP) is a phenomenon characterized by phonation using the false vocal folds. Besides a substitution voice due to loss of the true vocal folds-so called compensatory type-the noncompensatory types have a psychogenic, functional, or habitual background. Therapeutic options for these cases so far comprise voice therapy, pharmacological therapy (injection of anesthetics or botulinum toxin), and, in case of failure, surgical resection of the ventricular folds. Indication for aggressive surgical interventions is usually difficult, as there is always a risk of producing an irreversible state with an even worse situation. We present two cases of functional (psychogenic) VFP treatment refractory to conservative treatment. Lateralization of the ventricular folds by an endo-extralaryngeal temporary suture, similar to that used in bilateral vocal fold paralysis, was performed. Immediately after the procedure, a constant phonation at glottic level could be achieved in both cases. Sutures were removed 4 days after surgery, and phonation remained at the glottic level. Vocal fold phonation could be stabilized in the long run, and both patients recovered completely under additional voice therapy. PMID:19853409

  16. Modification of the internal suture technique for mallet finger.

    PubMed

    Jiang, Bo; Wang, Peiji; Zhang, Yong; Zhao, Jiaju; Dong, Qirong

    2015-02-01

    This article describes a treatment of tendinous mallet finger deformities using a modified internal suture technique for the stable fixation of the terminal extensor tendon and bone.Between March 2011 and July 2013, 15 patients with mallet fingers who had been treated using this modification were included in this study. The patients included 10 men and 5 women with a mean age of 33 years (range, 19-50 years). Of these patients, 9 had chronic mallet fingers, 3 were unable to comply with a splinting regimen, and 3 had a history of unsuccessful splinting therapy. The mean time between the injury and surgery was 5.5 months (range, 1-15 months). We graded the results using Crawford criteria.The mean follow-up period was 12 months (range, 9-16 months). The mean final active range of motion of the distal interphalangeal joint flexion was 73° (range, 60°-90°). Based on Crawford evaluation criteria, 8 patients were graded as excellent, 6 were graded as good, and 1 was graded as fair. Apart from 2 documented mild nail deformities, no complications were encountered.This modified technique should be considered for the management of a tendinous mallet finger deformity when the internal suture technique is planned. PMID:25674757

  17. Tissue-engineered Rabbit Cranial Suture from Autologous Fibroblasts and BMP2

    Microsoft Academic Search

    L. Hong; J. J. Mao

    2004-01-01

    Craniosynostosis is a congenital disorder of premature ossification of cranial sutures, occurring in one of approximately every 2500 live human births. This work addressed a hypothesis that a cranial suture can be tissue-engineered from autologous cells. Dermal fibroblasts were isolated subcutaneously from growing rabbits, culture-expanded, and seeded in a gelatin scaffold. We fabricated a composite tissue construct by sandwiching the

  18. Sutural loosening and skeletal flexibility during growth: determination of drop-like shapes in sea urchins.

    PubMed

    Johnson, Amy S; Ellers, Olaf; Lemire, Jim; Minor, Melissa; Leddy, Holly A

    2002-02-01

    The shape of sea urchins may be determined mechanically by patterns of force analogous to those that determine the shape of a water droplet. This mechanical analogy implies skeletal flexibility at the time of growth. Although comprised of many rigid calcite plates, sutural collagenous ligaments could confer such flexibility if the sutures between plates loosened and acted as joints at the time of growth. We present experimental evidence of such flexibility associated with weight gain and growth. Over 13-, 4-, and 2-week periods, fed urchins (Strongylocentrotus droebachiensis) gained weight and developed looser sutures than unfed urchins that maintained or lost weight. Further, skeletons of fed urchins force-relaxed more than did those of unfed urchins and urchins with loose sutures force-relaxed more than those with tight sutures. Urchins (Strongylocentrotus franciscanus) fed for two and a half weeks, gained weight, also had looser skeletons and deposited calcite at sutural margins, whereas unfed ones did not. In field populations of S. droebachiensis the percentage having loose sutures varied with urchin diameter and reflected their size-specific growth rate. The association between feeding, weight gain, calcite deposition, force relaxation and sutural looseness supports the hypothesis that urchins deform flexibly while growing, thus determining their drop-like shapes. PMID:11839189

  19. Blood flow through sutured and coupled microvascular anastomoses: a comparative computational study.

    PubMed

    Wain, Richard A J; Whitty, Justin P M; Dalal, Milind D; Holmes, Michael C; Ahmed, Waqar

    2014-07-01

    This study uses computational fluid dynamics (CFD) to model blood flow through idealised sutured and coupled arterial anastomoses to investigate the affect of each technique on intravascular blood flow. Local flow phenomena are examined in detail to study characteristics that potentially initiate thrombus formation; for example, changes in velocity profile, wall shear stress (WSS), and shear strain rate (SSR). Idealised geometries of sutured and coupled anastomoses were created with dimensions identical to microvascular suture material and a commercially available coupling device using CFD software. Vessels were modelled as non-compliant 1 mm diameter ducts, and blood was simulated as a Newtonian fluid, in keeping with previous studies. All analyses were steady-state and performed on arteries. The sutured simulation revealed a reduced boundary velocity profile; high WSS; and high SSR at the suture sites. The coupled anastomosis simulation showed a small increase in maximum WSS at the anastomotic region compared to a pristine vessel, however, this was less than half that of the sutured model. The coupled vessel displayed an average WSS equivalent to a pristine vessel simulation. Taken together these observations demonstrate a theoretically more thrombogenic profile in a sutured anastomosis when compared to a coupled vessel. Data from simulations on a coupled anastomosis reveal a profile that is nearly equivalent to that of a pristine vessel. Based purely on the combination of less favourable flow properties shown using these idealised arterial models, the sutured method is potentially more thrombogenic than a coupled anastomosis. PMID:24731801

  20. Delayed foreign-body reaction to silk sutures in pediatric neurosurgical patients

    Microsoft Academic Search

    Eugene Rossitch; Dennis E. Bullard; W. Jerry Oakes

    1987-01-01

    Nonabsorbable silk sutures have been a frequently used foreign material in neurosurgery. In general, they are reliable and safe with minimal bio-incompatibility. Three pediatric neurosurgical patients came to clinical attention, however, because of delayed foreign-body reactions to silk sutures. The delayed atypical presentation of these patients delayed appropriate diagnosis and therapy. In two patients, the reaction presented as a delayed

  1. Effect of Pantoprazole Administered Subcutaneously on the Healing of Sutured Gastric Incisions in Rats

    Microsoft Academic Search

    E. A. Bonin; A. C. L. Campos; J. C. U. Coelho; J. E. F. Matias; O. Malafaia; T. H. Jonasson

    2005-01-01

    Background: The properties of proton pump inhibitors most investigated are related to peptic diseases and upper gastrointestinal bleeding, but their influence on the healing of sutured gastric incisions has not been assessed. In the present study we evaluated the effect of subcutaneously administered pantoprazole on the healing of sutured gastric incisions in rats. Methods: Sixty rats were divided into a

  2. Repair of collateral ligament instability in 2 foals by using suture anchors.

    PubMed Central

    Rodgerson, D H; Spirito, M A

    2001-01-01

    Instability of the collateral ligaments of the carpal or metacarpophalangeal joint occurred in 2 foals. The instability was repaired using commercial suture anchors. In foals, commercial suture anchors combined with external coaptation can be used successfully to repair collateral ligament instability of the carpus or the metacarpophalangeal joint. Images Figure 1. PMID:11467186

  3. Fibroblast growth factors lead to increased Msx2 expression and fusion in calvarial sutures.

    PubMed

    Ignelzi, Michael A; Wang, Wei; Young, Andrew T

    2003-04-01

    Craniosynostosis, the premature fusion of the skull bones at the sutures, represents a disruption to the coordinated growth and development of the expanding brain and calvarial vault and is the second most common birth defect that affects the craniofacial complex. Mutations in the human homeobox-containing gene, Msx2, have been shown to cause Boston type craniosynostosis, and we have shown that overexpression of Msx2 leads to craniosynostosis in mice. Activating mutations in fibroblast growth factor (FGF) receptors are thought to cause craniosynostosis in Crouzon, Apert, Jackson-Weiss, Beare-Stevenson, and Muenke syndromes. To mimic activated signaling by mutated FGF receptors, we used heparin acrylic beads to deliver FGF ligands to mouse calvaria and demonstrated increased Msx2, Runx2, Bsp, and Osteocalcin gene expression, decreased cell proliferation, and suture obliteration and fusion. FGF2 elicited the greatest increase in Msx2 expression, and FGF1 was most likely to cause suture obliteration and fusion. Of the three sutures studied, the coronal suture exhibited the greatest increase in Msx2 expression and was the most likely to undergo obliteration and fusion. These results are intriguing because the coronal suture is the most commonly affected suture in syndromic craniosynostosis. These results suggest that Msx2 is a downstream target of FGF receptor signaling and that increased FGF signaling leads to osteogenic differentiation by sutural mesenchyme in mouse calvaria. These results are consistent with the hypotheses that increased Msx2 expression and activated signaling by mutated FGF receptors lead to craniosynostosis. PMID:12674336

  4. Barbed Suture: A Review of the Technology and Clinical Uses in Obstetrics and Gynecology

    PubMed Central

    Greenberg, James A; Goldman, Randi H

    2013-01-01

    Surgical knots are simply a necessary evil needed to anchor smooth suture to allow it to function in its role in tissue reapproximation. Surgical knots reduce the tensile strength of all sutures by thinning and stretching the material. The tying of surgical knots introduces the potential of human error and interuser variability. Knot-secured smooth suture must create an uneven distribution of tension across the wound with the higher tension burdens placed at the knots. Given the excessive relative wound tension on the knot and the reasonable concerns of surgeons for suture failure due to knot slippage, there is a natural tendency toward overcoming these concerns by over-tightening knots; however, tighter knots may be worse for wound healing and strength than looser knots. In minimally invasive laparoscopic surgeries, the ability to quickly and properly tie surgical knots presents a new challenge. In cases in which knot tying is difficult, the use of knotless barbed suture can securely reapproximate tissues with less time, cost, and aggravation. This article reviews the technology behind barbed sutures with a focus on understanding how they differ from traditional smooth sutures and how barbed sutures have performed in in vitro and animal model testing, as well as in human clinical trials. PMID:24920976

  5. 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...

  6. 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

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

    E-print Network

    Boyce, Mary Cunningham

    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 ...

  8. 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

  9. Tibetan Apples and Oranges: Surficial Sutures and Overlapping Lithospheres

    NASA Astrophysics Data System (ADS)

    Chen, W. P.; Hung, S. H.; Wang, C. Y.; Tseng, T. L.

    2014-12-01

    Multi-scale, finite-frequency tomography across the Himalayas-Tibet shows a clear, subhorizontal anomaly of high VP and VSin the upper mantle that can be traced from under N. India all the way to beneath central Tibet. This configuration of the "Greater India" (GI), or the submerged, northern portion of the Indian shield, is combined with other constraints to reconstruct position of the Indian lithospheric mantle (ILM) relative to Asia back to about 15 Ma ago, or the onset of the latest magmatic activity in Tibet. By then, the leading edge of the ILM (Indian mantle front, IMF) has advanced subhorizontally past the entire Lhasa terrane and also probably have caused the lithospheric mantle beneath the Qiangtang terrane to thicken. The thickening is likely to have led to Rayleigh-Taylor instability, causing widespread but small volume of magmatic activity in northern Tibet. Meanwhile, the detached lithospheric mantle foundered through the upper mantle to rest at the bottom of the mantle transition zone (MTZ), just above the lower mantle. This detached lithospheric mantle manifests itself as a large-scale seismic anomaly of high compressional wave speed (VP) but curiously is undetectable through shear-waves. Based on laboratory data for nominally anhydrous olivine and its high-pressure polymorphs (NAO), the discordant results between P- and S-waves is explained by abundant hydroxyls in the foundered lithospheric mantle, a hypothesis supported by other evidences as well. Since NAO can hold ~1 wt% of water throughout the upper mantle and the MTZ, foundering of thickened lithospheric mantle caused by continental collision is an under-appreciated but effective pathway for water to enter the deep mantle. Currently, the Indus-Yarlung suture between northern India and the Lhasa terrane appears to be an inactive, crustal feature, as the GI continues to pass beneath it. On the other hand, even though the IMF has now advanced northward beyond the Bangong-Nujiang suture (BNS), which marks the suture between the Lhasa (southern Tibet) and the Qiangtang terranes (central Tibet) in the Mesozoic, the BNS seems to have been a zone of deformation over lithospheric scale when the IMF interacted with the Qiangtang lithosphere about 15 Ma ago. Indeed the Moho around this zone is highly disturbed, a feature not found elsewhere under Tibet.

  10. Do progressive tension sutures really decrease complications in abdominoplasty?

    PubMed

    Khan, Sami; Teotia, Sumeet S; Mullis, William F; Jacobs, William E; Beasley, Michael E; Smith, Kevin L; Eaves, Felmont F; Finical, Stephan J; Watterson, Paul A

    2006-01-01

    The purpose of this study is to evaluate the efficacy of progressive tension sutures (PTS) in preventing or reducing seroma formation and local wound complications in patients undergoing abdominoplasty. Forty-nine patients who underwent abdominoplasty procedures with the use of PTS were retrospectively compared with a historical control group of 54 patients who underwent standard abdominoplasty. Primary outcomes measured were seroma formation and local wound complications, including hypertrophic scar formation, umbilical distortion, and wound necrosis. Secondary outcomes were all other complications and time to drain removal. Overall complication rates and local wound complication rates were significantly reduced with the addition of PTS to abdominoplasty. Seroma formation and the time to drain removal were reduced in the PTS group, but the findings were not statistically significant. PMID:16374089

  11. A double blind randomized controlled trial comparing primary suture closure with mesh augmented closure to reduce incisional hernia incidence

    PubMed Central

    2013-01-01

    Background Incisional hernia is the most frequently seen long term complication after laparotomy causing much morbidity and even mortality. The overall incidence remains 11-20%, despite studies attempting to optimize closing techniques. Two patient groups, patients with abdominal aortic aneurysm and obese patients, have a risk for incisional hernia after laparotomy of more than 30%. These patients might benefit from mesh augmented midline closure as a means to reduce incisional hernia incidence. Methods/design The PRImary Mesh Closure of Abdominal Midline Wound (PRIMA) trial is a double-blinded international multicenter randomized controlled trial comparing running slowly absorbable suture closure with the same closure augmented with a sublay or onlay mesh. Primary endpoint will be incisional hernia incidence 2 years postoperatively. Secondary outcomes will be postoperative complications, pain, quality of life and cost effectiveness. A total of 460 patients will be included in three arms of the study and randomized between running suture closure, onlay mesh closure or sublay mesh closure. Follow-up will be at 1, 3, 12 and 24 months with ultrasound imaging performed at 6 and 24 months to objectify the presence of incisional hernia. Patients, investigators and radiologists will be blinded throughout the whole follow up. Disccusion The use of prosthetic mesh has proven effective and safe in incisional hernia surgery however its use in a prophylactic manner has yet to be properly investigated. The PRIMA trial will provide level 1b evidence whether mesh augmented midline abdominal closure reduces incisional hernia incidence in high risk groups. Trial registration Clinical trial.gov NCT00761475. PMID:24499111

  12. 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.

  13. Knot security, loop security, and elongation of braided polyblend sutures used for arthroscopic knots.

    PubMed

    Livermore, Ryan W; Chong, Alexander C M; Prohaska, Daniel J; Cooke, Francis W; Jones, Teresa L

    2010-12-01

    In the study described here, we evaluated load to failure and cyclic loading elongation of different braided polyblend sutures under different sliding knot configurations. Four braided polyblend sutures (FiberWire, Herculine, Orthocord, Ultrabraid) were tied with 5 sliding arthroscopic knots (Static surgeon, Weston, Roeder, Nicky, Tennessee slider) with a series of 3 reversing half-hitches on alternating posts (RHAPs). Each knot was tied around a 30-mm circumference post to ensure a consistent loop circumference. Loop security was measured as load to failure (load at 3-mm cross-head displacement or suture breakage) and loop elongation at a frequency of 1 Hz from 6 N to 30 N for 1000 cycles. Twenty knots were tied for each possible combination of knots and sutures, 10 for load to failure and 10 for cyclic loading test. For any given knot type, tying with Ultrabraid suture material resulted in maximum performance in the maximum load-to-failure test. Conversely, tying with Orthocord resulted in a significantly lower maximum load to failure, with the exception of the Surgeon knot. The Weston knot with 3 RHAPs using Ultrabraid provided the highest load to failure(mean, 346 N; SD, 24 N). All knots elongated less than 0.45 mm at the 1000th cycle and experienced higher suture slippage at initial cyclic loading (50th cycles). At higher cycles, FiberWire and Orthocord demonstrated less than half of the suture slippage of Herculine and Ultrabraid (5x10(-5) vs 11x10(-5) mm/cycle). Different braided polyblend sutures provide different knot and loop security for a given type of sliding knot. All knots in this study appear to be durable with respect to resistance to loosening under cyclic loading conditions. The Weston knot with 3 RHAPs using Ultrabraid provided the best loop and knot security. Our study results help further our understanding of the biomechanics of knot and loop security differences for different braided polyblend sutures. PMID:21720573

  14. Ameloblastin inhibits cranial suture closure by modulating MSX2 expression and proliferation.

    PubMed

    Atsawasuwan, Phimon; Lu, Xuanyu; Ito, Yoshihiro; Zhang, Youbin; Evans, Carla A; Luan, Xianghong

    2013-01-01

    Deformities of cranial sutures such as craniosynostosis and enlarged parietal foramina greatly impact human development and quality of life. Here we have examined the role of the extracellular matrix protein ameloblastin (Ambn), a recent addition to the family of non-collagenous extracellular bone matrix proteins, in craniofacial bone development and suture formation. Using RT-PCR, western blot and immunohistochemistry, Ambn was localized in mouse calvarial bone and adjacent condensed mesenchyme. Five-fold Ambn overexpression in a K14-driven transgenic mouse model resulted in delayed posterior frontal suture fusion and incomplete suture closure. Moreover, Ambn overexpressor skulls weighed 13.2% less, their interfrontal bones were 35.3% thinner, and the width between frontal bones plus interfrontal suture was 14.3% wider. Ambn overexpressing mice also featured reduced cell proliferation in suture blastemas and in mesenchymal cells from posterior frontal sutures. There was a more than 2-fold reduction of Msx2 in Ambn overexpressing calvariae and suture mesenchymal cells, and this effect was inversely proportionate to the level of Ambn overexpression in different cell lines. The reduction of Msx2 expression as a result of Ambn overexpression was further enhanced in the presence of the MEK/ERK pathway inhibitor O126. Finally, Ambn overexpression significantly reduced Msx2 down-stream target gene expression levels, including osteogenic transcription factors Runx2 and Osx, the bone matrix proteins Ibsp, ColI, Ocn and Opn, and the cell cycle-related gene CcnD1. Together, these data suggest that Ambn plays a crucial role in the regulation of cranial bone growth and suture closure via Msx 2 suppression and proliferation inhibition. PMID:23593111

  15. Journal of the Geological Society, London, Vol. 150, 1993, pp. 1065-1074, 13 figs. Printed in Northern Ireland Structure of the late Proterozoic Nakasib suture, Sudan

    E-print Network

    Stern, Robert J.

    . It is one of the ophiolite-decorated sutures along which the late Proterozoic (Pan-African) island arc the Nakasib suture. These sutures show a common feature of steepening of the early subhorizontal ophiolite). These terranes are welded along ophiolite-decorated sutures (Kroner 1985) and disrupted along shear zones (Almond

  16. Abbe's law, 210 absorbing media

    E-print Network

    Stanford University

    Index Abbe's law, 210 absorbing media apparent lack of energy conservation, 197--198 exceptions--199 absorbing medium, 193, 194 absorption coefficient, 195 absorption estimator, 47 acceptance probability, 336 distribution function, see BTDF birefringence, 20 black body, 179 Boltzmann equation, 23 boundary distance

  17. Energy absorber for the CETA

    NASA Technical Reports Server (NTRS)

    Wesselski, Clarence J.

    1994-01-01

    The energy absorber that was developed for the CETA (Crew Equipment and Translation Aid) on Space Station Freedom is a metal on metal frictional type and has a load regulating feature that prevents excessive stroking loads from occurring while in operation. This paper highlights some of the design and operating aspects and the testing of this energy absorber.

  18. 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).

  19. A comparison of suture and tubulization nerve repair techniques in a primate.

    PubMed

    Hentz, V R; Rosen, J M; Xiao, S J; McGill, K C; Abraham, G

    1991-03-01

    This study compared standard methods of nerve repair, epineurial or perineurial sutures with a technique termed fascicular tubulization using a biodegradable polyglycolic acid tube in a nonhuman primate model. Electrophysiologic analysis demonstrated that the percentage of proximal axons that conducted across the repair site did not significantly differ among the three techniques while epineurial suture repairs were associated with significantly longer conduction delays across the repair site compared with the other two techniques. Even though fascicular tubulization using the current polyglycolic acid tube resulted in regeneration equal to the currently perceived best suture repair technique, associated technical problems with the current tube design indicate that this fascicular tubulization technique cannot, at present, be considered as an alternative to present clinically used nerve suture techniques. PMID:1850770

  20. Timing of cranial suture closure in placental mammals: phylogenetic patterns, intraspecific variation, and comparison with marsupials.

    PubMed

    Rager, Lisa; Hautier, Lionel; Forasiepi, Analía; Goswami, Anjali; Sánchez-Villagra, Marcelo R

    2014-02-01

    Used as markers of postnatal growth closure sequences of 22 ectocranial sutures and synchondroses were recorded in a sample of 1161 skulls belonging to 38 species from all major placental clades: Afrotheria, Xenarthra, Laurasiatheria and Euarchontoglires (Boreoeutheria). The maximum closure level, which is not significantly correlated to body mass, is higher in Afrotheria and Xenarthra than in Boreoeutheria. Only the basioccipito-basisphenoid and the basioccipito-exoccipital synchondroses close in all species sampled, the supraoccipito-exoccipital and the inter-parietal sutures do in most species. Parsimov retrieved more heterochronic shifts for Afrotheria and Xenarthra than for Boreoeutheria. The amount of intraspecific variation differs among the species sampled being high among xenarthran species and low among afrotherians. Specimens (162) representing 12 marsupial genera were also analysed. Placentals exhibit a larger number of suture closures than marsupials and in both groups the sutures at the base of the skull are the first to fuse starting with the basioccipito-exoccipital. PMID:24127274

  1. Usefulness of an additional mattress suture for the extracranial drainage catheter.

    PubMed

    Eom, Dong Woong; Kim, Jung Soo; Jeon, Kyoung Dong; Kim, Hoon; Choi, Byeong Sam

    2013-11-01

    In most intracranial surgery cases, a drain catheter is inserted to prevent the collection of the wound hematoma or seroma. A drain catheter is also inserted to drain the hematoma or the cerebrospinal fluid. The drain catheter itself does not cause complications; but many complications occur during its removal, such as hematoma, seroma, air collection and pseudomeningocele formation. To prevent these complications, neurosurgeons perform a suture on the catheter to remove the site. In this study, an additional horizontal mattress suture and an anchoring suture to the drainage catheter are proposed. This method maintains negative pressure in the catheter insertion site during the catheter removal, compresses the catheter tunnel site and attaches the external wounds strongly. The technique is easy and safe to perform, and does not require an additional suture to remove the catheter. PMID:24379957

  2. [Approaches for formation of the large bowel anastomoses for prophylaxis of their sutures insufficiency].

    PubMed

    Militsa, N N; Postolenko, N D; Militsa, K N; Angelovski?, I N; Soldusova, V V; Kazakov, V S

    2014-11-01

    The results of surgical treatment of 424 patients, in whom the postponed and elective surgery was done for the large bowel malignancies, were analyzed. Advantages of a one-layer suture while formation of a large-bowel anastomoses in comparison with a two-layer suture were noted: minimal rate of the sutures insufficiency--(4.9 +/- 0.8)%, and (7.9 +/- 1.7)%, accordingly (p<0.001). Mostly often insufficience of the colorectal anastomosis sutures was observed after anterior rectal resection--in (9.7 +/- 1.9)% and (7.2 +/- 1.5)% patients. Postoperative lethality was 2.6%, for majority of the patients the reasons of the death were pulmonary thromboembolism and an acute cardio-vascu- lar insufficiency. PMID:25675738

  3. Bilateral squamosal suture synostosis: A rare form of isolated craniosynostosis in Crouzon syndrome

    PubMed Central

    Tandon, Yasmeen K; Rubin, Michael; Kahlifa, Mohamed; Doumit, Gaby; Naffaa, Lena

    2014-01-01

    Craniosynostosis is a pathologic condition which is characterized by the premature fusion of cranial sutures. It may occur alone or in association with other anomalies making up various syndromes. Crouzon syndrome is the most common craniosynostosis syndrome. Bicoronal sutures fusion is most commonly involved in Crouzon syndrome. There have only been a handful of cases of squamosal suture synostosis described in the surgery literature with the few ones described in Crouzon syndrome associated with other types of craniosynostosis. To the best of our knowledge, we are presenting the first case of isolated bilateral squamosal suture synostosis in a patient with Crouzon syndrome in a radiology journal with emphasis on its radiological appearance. PMID:25071892

  4. 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.

  5. 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

  6. Medical treatment of craniosynostosis: recombinant Noggin inhibits coronal suture closure in the rat craniosynostosis model.

    PubMed

    Shen, K; Krakora, S M; Cunningham, M; Singh, M; Wang, X; Hu, F Z; Post, J C; Ehrlich, G D

    2009-08-01

    INTRODUCTION - The mechanisms underlying craniosynostosis remains unknown. However, mutations in FGFR2 are associated with craniosynostotic syndromes. We previously compared gene expression patterns of patent and synostosing coronal sutures in the nude rat and demonstrated down regulation of Noggin in synostosing sutures. Noggin expression is also suppressed by FGF2 and constitutive FGFR2 signaling [Warren et al. (2003) Nature, vol. 422, pp. 625-9; McMahon et al. (1998) Genes Dev, vol. 12, pp. 1438-52]. Thus, we therefore hypothesized that the addition of rhNoggin to prematurely fusing sutures should prevent synostosis. MATERIALS AND METHODS - Cohorts of nude rats were subjected to: 1) surgical elevation of the coronal suture (shams); 2) surgical elevation and placement of normal or FGFR2 mutant human osteoblasts onto the underlying dura (xenotransplants); or 3) xenotransplantation with co-application of heparin acrylic beads soaked with recombinant human (rh) Noggin. Eleven days post-surgery the sutures were harvested, stained, and histologically examined. RESULTS - Animals that received control osteoblasts, sham surgery, or no surgery demonstrated normal skull growth and coronal suture histology, whereas animals transplanted only with FGFR2 mutant osteoblasts showed evidence of bridging synostosis on the calvarial dural surface. Sutures treated with FGFR2 mutant osteoblasts and rhNoggin remained patent. CONCLUSION - The chimeric nude rate model is a viable model of craniosynostosis. FGFR2 mutations in osteoblasts induce bridging osteosynthesis demonstrating one of the mechanisms for premature suture fusion. Topical application of rhNoggin protein prevents craniosynostosis in the weanling nude rat xenotransplantation model of syndromic craniosynostosis. PMID:19627528

  7. Effect of Dietary Ascorbic Acid on Osteogenesis of Expanding Midpalatal Suture in Rats

    PubMed Central

    Farhadian, Nasrin; Miresmaeili, Amirfarhang; Azar, Ramin; Zargaran, Massoumeh; Moghimbeigi, Abbas; Soheilifar, Sanaz

    2015-01-01

    Objectives: After maxillary expansion, a long period of retention is necessary to prevent early relapse. Therefore, it is beneficial to accelerate bone formation in the expanding midpalatal suture to reduce relapse. This study was designed to evaluate the effect of dietary vitamin C on osteogenesis of rat midpalatal suture during expansion. Materials and Methods: Fifty-four male Wistar rats were randomly divided into three groups, each with a control and an experimental subgroup. An open-loop spring was bonded to maxillary incisors of each animal to expand the premaxillary suture. Experimental groups received dietary vitamin C in their water. The rats in the three groups were sacrificed at three, nine or 17-day intervals after bonding the spring. Then, the premaxilla was dissected and sections were made and stained with hematoxylin and eosin and osteopontin marker. Osteoblasts and osteoclasts were counted in the suture. Two-way ANOVA and the Mann-Whitney-U test were used for analyzing the data. Results: After three days, the number of osteoblasts was significantly higher in the vitamin C group but after nine days it was significantly higher in the control group and after seventeen days there were no significant differences between the groups. Osteoclast counts were not significantly different between vitamin C and control groups. Conclusion: Vitamin C had a positive effect on osteogenesis at the beginning of bone formation in the expanding suture, but after nine days it had a negative effect on suture osteogenesis in rats. PMID:26005453

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

    PubMed Central

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

    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 lineages, with mtDNA sequence divergences ranging from 2 to 15 per cent. Contact zones are significantly clustered in a suture zone located between two major Quaternary refugia. Within this area, there is a trend for secondary contacts to occur in regions with low environmental suitability relative to both adjacent refugia and, by inference, the parental lineages. The extent and form of reproductive isolation among interacting lineages varies across species, ranging from random admixture to speciation, in one case via reinforcement. Comparative phylogeographic studies, combined with environmental analysis at a fine-scale and across varying climates, can generate new insights into suture zone formation and to diversification processes in species-rich tropical rainforests. As arenas for evolutionary experimentation, suture zones merit special attention for conservation. PMID:19203915

  9. Preliminary stress/strain analysis of laser-soldered and -sutured vascular tissue

    NASA Astrophysics Data System (ADS)

    Ashton, Robert C., Jr.; Oz, Mehmet C.; Lontz, John F.; Lemole, Gerald M.

    1991-06-01

    Stress-strain profiles of welded tissue provide additional means of analysing and comparing laser soldering to alternative anastoinosing techniques. Three groups were created in a rabbit model: (1) nonincised control aortic tissue, (2) longitudinal aortotomies repaired with a 808 nm diodelaser (power density 4.8 watts/cm2) after topical application of fibrinogen mixed with indocyanine green dye (peak absorption 805 nm) , and (3) aortotomies repaired with 6-0 polypropylene suture in a running fashion. The rabbits were sacrificed on 0,l,7,and 28 postoperative days and the fresh aortic specimens were strained until disruption in order to produce a stress-strain profile graph. No significant differences were noted between sutured and bonded aorta at any time interval. Nonincised (which served as a control) aortic tissuewithstood significantly higher stress (p<.05) than both sutured and bonded groups at the time of creation. By seven days after operation, no significant differences were noted between any of the three groups. The only significant difference in modulus (stretchability) identified the sutured aorta to be more rigid than the nonincised group (p<.05). Both sutured and laser bonded anastoinoses are weaker than control aorta initially; however, after an early critical period, both treatments achieve the strength of control aorta. By one nionth post-operatively, sutured anastomoses have the disadvantage of creating a less distensible anastomosis.

  10. 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

  11. Influence of two-dimensional and three-dimensional imaging on endoscopic bowel suturing.

    PubMed

    Hanna, G B; Cuschieri, A

    2000-04-01

    Several three-dimensional (3-D) video-endoscopic systems have been introduced in surgical practice to enhance depth perception during minimal access surgery (MAS), but the facilitation of endoscopic manipulations by the current 3-D systems remains unproved. The aim of the study was to investigate the influence of 2-D and 3-D imaging modalities on intracorporeal suturing. The standard task consisted of suture closure of 60 mm enterotomies made in porcine small bowel with continuous seromuscular 3/0 Polysorb. Ten experienced surgeons participated in the study. The imaging systems were Storz (2-D), Welch Allyn (3-D), and Zeiss (as both 2-D and 3-D). Each surgeon performed two tasks with each modality in a random sequence. The outcome measures were execution time, suture line leakage pressure, and suture placement score. In addition, the participating surgeons assigned subjective scores on the image quality and the adverse effects of the imaging systems. There was no significant difference in the execution time, leakage pressure, and suture placement score among the various imaging modalities. Depth perception was rated as similar with 2-D and 3-D imaging. Surgeons experienced visual strain with the three systems, but it was rated higher with 3-D imaging. With the current technology, we have not documented any significant difference in task efficiency and quality of endoscopic bowel suturing by trained surgeons between 2-D and 3-D imaging systems. PMID:10706917

  12. 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.

  13. 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.

  14. Liquid metal reactor absorber technology

    SciTech Connect

    Pitner, A.L.

    1990-10-01

    The selection of boron carbide as the reference liquid metal reactor absorber material is supported by results presented for irradiation performance, reactivity worth compatibility, and benign failure consequences. Scram response requirements are met easily with current control rod configurations. The trend in absorber design development is toward larger sized pins with fewer pins per bundle, providing economic savings and improved hydraulic characteristics. Very long-life absorber designs appear to be attainable with the application of vented pin and sodium-bonded concepts. 3 refs., 3 figs.

  15. Packed Alumina Absorbs Hypergolic Vapors

    NASA Technical Reports Server (NTRS)

    Thomas, J. J.; Mauro, D. M.

    1984-01-01

    Beds of activated alumina effective as filters to remove hypergolic vapors from gas streams. Beds absorb such substances as nitrogen oxides and hydrazines and may also absorb acetylene, ethylene, hydrogen sulfide, benzene, butadiene, butene, styrene, toluene, and xoylene. Bed has no moving parts such as pumps, blowers and mixers. Reliable and energy-conservative. Bed readily adapted to any size from small portable units for use where little vapor release is expected to large stationary units for extensive transfer operations.

  16. 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.

  17. Countercurrent flow absorber and desorber

    DOEpatents

    Wilkinson, William H. (Columbus, OH)

    1984-01-01

    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.

  18. Deep suture zone in the North Barents Basin

    NASA Astrophysics Data System (ADS)

    Butsenko, Viktor; Kireev, Artem; Piskarev, Alexey; Savin, Vasily; Smirnov, Oleg

    2015-04-01

    Study of sedimentary basin evolution is a part of research for the forecast of oil and gas capacity of the North Barents shelf. Maps of potential fields anomalies are compiled on the basis of the latest geophysical databases, structural maps of the seismic horizons are analyzed, the location of sources of potential fields anomalies are calculated, 3D density and magnetic models of Earth's crust are constructed. Six seismic complexes are allocated in sedimentary cover structure: Devonian - Lower Carboniferous, Upper Carboniferous - Lower Permian, Mid Permian - Lower Triassic, Triassic - Lower Jurassic, Upper Jurassic - Lower Cretaceous, Lower Cretaceous - Quaternary. The research of lateral changes of allocated layers thickness gives an idea of sedimentation in the region on various time intervals. The structural and tectonic scheme of the region is made after analysis of new geologic-geophysical materials. Contact zones of heterogeneous blocks of the crystalline basement are marked, disjunctive dislocations in a sedimentary cover and the upper crust, and also zones of increase of sediments thickness in various seismic complexes are designated. The deep suture zone delimiting Mesozoic and Paleozoic sedimentary basins has the most important geological value among disjunctive zones of the region. This zone stretches along the Admiralty Arch in East part of the North Barents shelf and is marked by negative magnetic anomaly 30-50 km wide. In view of special tectonic value of the suture zone marked by this anomaly we have calculated the 3D magnetic crust model. The sedimentary layers of a model section is based on seismic data. As a result of modeling the studied anomaly of a magnetic field can be approximated by the block of basement rocks of the lowered magnetization (1.2 A/m). The surface of this block is located in a zone of anomaly at a depth of 12-14 km. The asymmetry of anomaly is accounted by an inclination to East of the borders of the block with low magnetization. Calculated basement magnetization is 1.9 A/m to the West from an anomaly zone that is a characteristic for many igneous and metamorphic rocks of the diorite composition. Magnetization of the basement formations sharply increases to 3.6 A/m to the East. Similar values of magnetization are characterized basalts and dolerites, and also many metamorphic rocks of the basic and ultrabasic composition. Thus, the simulated magnetic field anomaly not only corresponds to limits of the heterochronous sedimentary basins, but also shows the border between two heterogeneous basement blocks. "Bright spot" anomalies are marked out on seismic sections. Bright spots are mainly located near the zone of negative magnetic anomaly along the East part of the North Barents Basin. The AVO analysis of the anomalies of the seismic recording has allowed to allocate possible hydrocarbon reservoirs and to subdivide them into the gas-saturated and oil-gas-saturated.

  19. 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.

  20. 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.

  1. 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

  2. Effects of suture position on left ventricular fluid mechanics under mitral valve edge-to-edge repair.

    PubMed

    Du, Dongxing; Jiang, Song; Wang, Ze; Hu, Yingying; He, Zhaoming

    2014-01-01

    Mitral valve (MV) edge-to-edge repair (ETER) is a surgical procedure for the correction of mitral valve regurgitation by suturing the free edge of the leaflets. The leaflets are often sutured at three different positions: central, lateral and commissural portions. To study the effects of position of suture on left ventricular (LV) fluid mechanics under mitral valve ETER, a parametric model of MV-LV system during diastole was developed. The distribution and development of vortex and atrio-ventricular pressure under different suture position were investigated. Results show that the MV sutured at central and lateral in ETER creates two vortex rings around two jets, compared with single vortex ring around one jet of the MV sutured at commissure. Smaller total orifices lead to a higher pressure difference across the atrio-ventricular leaflets in diastole. The central suture generates smaller wall shear stresses than the lateral suture, while the commissural suture generated the minimum wall shear stresses in ETER. PMID:24211894

  3. SR and LR Union Suture for the Treatment of Myopic Strabismus Fixus: Is Scleral Fixation Necessary?

    PubMed Central

    Lam, Carol P. S.; Yam, Jason C. S.; Lau, Flora H. S.; Fan, Dorothy S. P.; Wong, C. Y.; Yu, Christopher B. O.; Lau, Winnie W. Y.

    2015-01-01

    Purpose. To evaluate and compare the effectiveness of scleral fixation SR and LR union suture and nonscleral fixation union suture for the treatment of myopic strabismus fixus. Methods. Retrospective review of 32 eyes of 22 patients with myopic strabismus fixus who had undergone union suture of superior rectus (SR) and lateral rectus (LR) with or without scleral fixation, and follow-up longer than 6 months at Hong Kong Eye Hospital from 2006 to 2013. Surgical techniques and outcomes in terms of ocular alignment are analyzed. Results. There is significant overall improvement both in postoperative angle of esodeviation (P < 0.01) and postoperative range of movement (P = 0.042). Comparing between the sclera fixation group (11 eyes) versus nonscleral fixation group (21 eyes), the postoperative horizontal deviation, the postoperative vertical deviation, successful outcome, and the change in horizontal deviation were not significantly different (P > 0.05). Conclusions. Union suture of SR and LR is an effective procedure in correcting myopic strabismus fixus. Fixation of the union suture to the sclera does not improve surgical outcome. PMID:25954751

  4. 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.

  5. Tectonics of the South Anyui suture: present day version

    NASA Astrophysics Data System (ADS)

    Sokolov, S. D.; Bondarenko, G. Y.; Layer, P. W.

    2004-12-01

    The South Anyui Suture (SAS) is one of the most prominent tectonic elements of North-East Asia separating the Verkhoyansk-Kolyma and Anyui-Chukotka fold belts. Following the Seslavinsky (1979), Parfenov (1984), and Natal'in (1984) the SAS is recognized as result of late Mesozoic collision between Siberia and North America continents. Many aspects of the SAS geology and evolution remain poorly understood: (i) the timing of the oceanic basin in-ception and existence; (ii) the inner structure and deformational history; (iii) the age and genesis of the ophiolites; (iv) the island-arc units distribution and age. Main results of our research in the SAS are: (1) The north vergent thrust structure is recog-nized. The autochthone includes shelf and slope sequences of the Chukotka microcontinent. The allochthone thrust package consists of ophiolitic, metamorphic, terrigenous, and island-arc rocks; (2) Late Mesozoic subduction related chaotic and intra oceanic island arc units are recognized; (3) A Bathonian-Callovian age of basalt-chert oceanic assemblages, previously reported as Late Jurassic to Neocomian; (4) A new 40Ar/39Ar data for: (i) Vurguveem ophio-litic gabbro 312.2 ± 11.1 Ià, (ii) diabase dike from Aluchin ophiolite 226.6 ± 10.5 Ià, (iii) amphibolites in the metamorphic sole of Uyamkanda ophiolite 239.1 ± 3.8 Ià, (iv) green-schists at the base of tectonic sheet 156.5 ± 3.9, 120.6 ± 3.5, 115.2 ± 1.3, 108.4 ± 1.2, and 104.1 ± 2.8 Ià. According new data tectonic evolution of SAS can be suggested the following: (1) Anyui oceanic basin existed from Mississippian to Neocomian; (2) Northern (present-day coordi-nates) margin of ocean was passive, and southern margin was active; (3) Oceanic spreading was stopped in Oxfordian, probably simultaneously with start of Canada basin opening (Grantz et al. 1998); (4) The collision accompanied by subduction of Chukotka passive mar-gin beneath the Siberia active margin; (5) Pre-collisional deformations was related with sub-duction; (6) Collisional deformations during Hauterivian to Aptian include two phases: early - thrust fault related and late - strike-slip fault related; (7) Post-collisional Albian to Senoma-nian deformations was produced by extensional event. Supported by RFBR (grant 02-05-64217), FCP "Integratsiya" (grant 0382).

  6. 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

  7. Suture-bridge subscapularis tendon repair technique using low anterior portals.

    PubMed

    Park, Jin-Young; Park, Jun-Suk; Jung, Jae-Kyung; Kumar, Praveen; Oh, Kyung-Soo

    2011-02-01

    A suture-bridge technique has been introduced to facilitate fixation procedures and to achieve increased holding strength in posterosuperior rotator cuff. Based on biomechanical studies, this technique has been suggested as an effective method that could optimize rotator cuff tendon-footprint contact area and mean pressure, as well as holding strength. In this technique, the suture-bridge creation is adapted for arthroscopic subscapularis repair to attain the ideal cuff integrity and footprint restoration. To obtain enough working portals and space, two accessory portals were made on the anterior aspect of the shoulder and use an elevator to retract the conjoined tendons and deltoid muscle. This technique could be useful for the repair of subscapularis tears, which are not easily approached using other arthroscopic techniques. From a biomechanical point of view, the subscapularis tendon could be restored more ideally using the suture-bridge technique. PMID:20890701

  8. 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.

  9. 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.

  10. 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

  11. 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.

  12. 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.

  13. Waveform-Dependent Absorbing Metasurfaces

    NASA Astrophysics Data System (ADS)

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

    2013-12-01

    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 (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.

  14. 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

  15. [Peritoneal closure using absorbable knotless device during laparoscopic sacrocolpopexy].

    PubMed

    Deffieux, X; Pachy, F; Donnadieu, A-C; Trichot, C; Faivre, E; Fernandez, H

    2011-02-01

    Laparoscopic sacrocolpopexy is one of the gold standards of pelvic organ surgery. However, this intervention is associated with long operation duration. One of the steps of this intervention (peritoneal closure) can be shortened using several methods of suturing (e.g. staples). Recently, a self-anchoring barbed suture has been described for wound closure. The goal of this initial feasibility study was to describe the use of the barbed suture (V-Loc™) in peritoneal closure during laparoscopic sacrocolpopexy. PMID:20943328

  16. Do manual assisting maneuvers increase speed and technical performance in robotically sutured coronary bypass graft anastomoses?

    Microsoft Academic Search

    J. Bonatti; J. Alfadlhi; T. Schachner; N. Bonaros; E. Rützler; G. Laufer

    2007-01-01

    Background  Robotic endoscopic coronary artery bypass grafting procedures usually are performed as solo surgery operations. This study\\u000a aimed to investigate whether manual assistance can reduce suturing times and anastomotic suturing problems in robotic coronary\\u000a artery surgery.\\u000a \\u000a \\u000a \\u000a Methods  In isolated pig hearts, the right coronary artery was excised from the epicardium as a pedicle. This pedicled vessel, which\\u000a resembles the internal mammary artery,

  17. Comparison of octyl-2-cyanoacrylate and conventional sutures in facial skin closure

    PubMed Central

    Shivamurthy, D. M.; Singh, Sourav; Reddy, Sasidhar

    2010-01-01

    Introduction: Closure of wounds to achieve an esthetically pleasing result has always been a challenge. Since time immemorial, surgeons have strived to produce “invisible scars”. This, however, has always been elusive. The introduction of tissue adhesives heralded the era of suture free closures which led to better results. Aims and Objectives: The aim of this study is to compare the efficacy of octyl- 2-cyanoacrylate with that of the conventional sutures, in facial skin closure. Results and Conclusion: The use of octyl-2-cyanoacrylate offers many advantages such as rapidity and ease of application and superior results. PMID:22442543

  18. UPb zircon ages of deformed carbonatite and alkaline rocks in the Pan-African Dahomeyide suture zone, West Africa

    Microsoft Academic Search

    P. M. Nude; F. Corfu; K. Attoh

    2006-01-01

    It has been proposed that the association of deformed carbonatite and alkali rocks (DARC) can be used to map ancient suture zones (Burke et al., 2003, Geology 31,319). The hypothesis considers the intrusion of such alkalic rocks as indicating lithospheric extension that preceded the suture-forming orogeny whereas the deformation evident in DARCs records the collisional event. As such, DARCs are

  19. Accretion leading to collision and the Permian Solonker suture, Inner Mongolia, China: Termination of the central Asian orogenic belt

    Microsoft Academic Search

    Wenjiao Xiao; Brian F. Windley; Jie Hao; Mingguo Zhai

    2003-01-01

    The Solonker suture records the termination of the central Asian Orogenic Belt (CAOB). However, tectonic development of the Solonker suture is poorly understood. We report new field data for the Ondor Sum melange in the Ulan valley, and present a new evaluation of the orogenic belt extending from the southern Mongolia cratonic boundary to the north China craton within the

  20. Aircraft absorbers - Promise and practice

    Microsoft Academic Search

    A. O. Andersson

    1981-01-01

    Attention is given to the application of sound absorbers to aircraft engine ducts. Fan duct application is discussed with reference to the frequency spectrum of fan noise, the wave number spectrum of fan noise, and both local and extended reactions to lining types. The design of duct linings is examined, noting a number of analysis techniques for non-uniform ducts and

  1. 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.

  2. Factors influencing wound complications: a clinical and experimental study.

    PubMed Central

    Bucknall, T. E.

    1983-01-01

    Burst abdomen, incisional herniation, sinus formation and post-operative wound infection continue to bedevil the surgeon. A prospective study of 1129 laparotomy wounds defined the extent of the problem; 1.7% incidence of dehiscence, 7.4% herniation and 6.7% sinus formation, all significantly associated with wound infection. Mass closure reduced the dehiscence rate from 3.8% to 0.76%. Infection reduced wound strength in a rat laparotomy model due to a decrease in fibroblast concentration and activity. A monofilament non-absorbable suture was shown experimentally to be the most suitable suture for closing infected abdominal wounds. Electron microscopy demonstrated bacteria in the interstices of infected multifilament sutures. A randomised clinical trial comparing polyglycolic acid and monofilament nylon in the closure of abdominal wounds confirmed the experimental findings; polyglycolic acid resulted in a significantly higher wound failure rate with no decrease in sinus formation. A mass closure technique using monofilament nylon is recommended for laparatomy closure and efforts should continue to reduce wound sepsis. Images Fig. 1 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 9 Fig. 10 Fig. 11 Fig. 12 PMID:6299161

  3. Sequential lift and suture technique for post-lasik corneal striae 1 1 Neither author has a financial interest in any product mentioned

    Microsoft Academic Search

    Richard J Mackool; Vivian R Monsanto

    2003-01-01

    We describe a surgical technique to manage persistent corneal striae after laser in situ keratomileusis (LASIK). The sequential lift and suture technique reduces the time required for LASIK, eliminates the need to fixate the flap with forceps during suturing, and increases the accuracy of suture placement. The results in 10 eyes (9 patients) showed complete resolution of striae with improvement

  4. The effect of core suture flexor tendon repair techniques on gliding resistance during static cycle motion and load to failure: a human cadaver study

    Microsoft Academic Search

    T. Moriya; M. C. Larson; C. Zhao; K.-N. An; P. C. Amadio

    2012-01-01

    The purpose of this study was to describe a modification of the Massachusetts General Hospital (MMGH) tendon repair and to compare it with three other suture techniques. Twenty human flexor digitorum profundus (FDP) tendons were randomly assigned to the modified Pennington (MP) suture and the MMGH suture. These were compared to the modified Kessler (MK) and Massachusetts General Hospital (MGH)

  5. Gondwana and Cathaysian blocks, palaeotethys sutures and cenozoic tectonics in South-east Asia

    Microsoft Academic Search

    Charles S. Hutchison

    1994-01-01

    The Triassic Indosinian Orogeny followed extinction of the Palaeotethys Ocean resulting in suturing of Gondwana affinity and Cathaysian blocks. The Gondwana affinity Sinoburmalaya block of Peninsular Malaysia, characterized by Carboniferous---Permian mudstones containing glacial dropstones and sparse fauna and flora, is traced extensively into Sumatra. This mudstone facies is flanked on the east by a sandstone-dominated facies and by carbonate localized

  6. All-Suture Transosseous Repair for Rotator Cuff Tear Fixation Using Medial Calcar Fixation.

    PubMed

    Aramberri-Gutiérrez, Mikel; Martínez-Menduiña, Amaia; Valencia-Mora, María; Boyle, Simon

    2015-04-01

    We describe an all-suture transosseous repair technique used in the management of rotator cuff tears by means of an all-suture anchor secured on the intra-articular side of the humeral calcar. The technique uses an anterior cruciate ligament guide to ensure accurate positioning of the tunnels, avoiding the articular cartilage and minimizing risk to the neurovascular structures. The distal end of the guide is inserted through a rotator interval portal and passed down to the axillary pouch. The proximal end of the guide is approximated to the greater tuberosity at the cuff footprint, and a complete transosseous tunnel is created with a 2.4-mm drill. An all-suture implant is inserted through this tunnel down to the calcar, and its deployment is visualized under arthroscopy. Gentle traction is applied to the anchor, resulting in a 4-mm concertina of the suture anchor that rests opposed to the medial cortex. The major advantage of this technique is the fixation strength gained from the biomechanically superior cortical bone of the calcar. Furthermore, this method permits greater preservation of bone surface area at the level of the footprint for a larger tendon-to-bone healing surface. This technique also provides an excellent alternative in revision situations. PMID:26052495

  7. All-Suture Transosseous Repair for Rotator Cuff Tear Fixation Using Medial Calcar Fixation

    PubMed Central

    Aramberri-Gutiérrez, Mikel; Martínez-Menduiña, Amaia; Valencia-Mora, María; Boyle, Simon

    2015-01-01

    We describe an all-suture transosseous repair technique used in the management of rotator cuff tears by means of an all-suture anchor secured on the intra-articular side of the humeral calcar. The technique uses an anterior cruciate ligament guide to ensure accurate positioning of the tunnels, avoiding the articular cartilage and minimizing risk to the neurovascular structures. The distal end of the guide is inserted through a rotator interval portal and passed down to the axillary pouch. The proximal end of the guide is approximated to the greater tuberosity at the cuff footprint, and a complete transosseous tunnel is created with a 2.4-mm drill. An all-suture implant is inserted through this tunnel down to the calcar, and its deployment is visualized under arthroscopy. Gentle traction is applied to the anchor, resulting in a 4-mm concertina of the suture anchor that rests opposed to the medial cortex. The major advantage of this technique is the fixation strength gained from the biomechanically superior cortical bone of the calcar. Furthermore, this method permits greater preservation of bone surface area at the level of the footprint for a larger tendon-to-bone healing surface. This technique also provides an excellent alternative in revision situations. PMID:26052495

  8. 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

  9. Skin Staples: A Safe Technique for Securing Mesh in Lichtensteins Hernioplasty as Compared to Suture

    PubMed Central

    Munghate, Anand; Mittal, Sushil; Singh, Harnam; Singh, Gurpreet; Yadav, Manish

    2014-01-01

    Background. Lichtenstein tension free repair is the most commonly used technique due to cost effectiveness, low recurrence rate, and better patient satisfaction. This study was done to compare the duration of surgery and postoperative outcome of securing mesh with skin staples versus polypropylene sutures in Lichtenstein hernia repair. Materials and Methods. A total of 96 patients with inguinal hernia undergoing Lichtenstein mesh repair were randomly assigned into two groups. The mesh was secured either by using skin staples (group I) or polypropylene sutures (group II). Results. The operation time was significantly reduced from mesh insertion to completion of skin closure in group I (mean 20.7?min) as compared to group II (mean 32.7?min) with significant P value (P < 0.0001) and less complication rate in group I as compared to group II. Conclusion. Mesh fixation with skin staples is as effective as conventional sutures with added advantage of significant reduction in the operating time and complications or recurrence. The staples can be applied much more quickly than sutures for fixing the mesh, thus saving the operating time. Infection rate is significantly decreased with staples. PMID:25379567

  10. Strikingly variable divergence times inferred across an Amazonian butterfly ‘suture zone’

    Microsoft Academic Search

    Alaine Whinnett; Marie Zimmermann; Keith R. Willmott; Nimiadina Herrera; Ricardo Mallarino; Fraser Simpson; Mathieu Joron; Gerardo Lamas; James Mallet

    2005-01-01

    'Suture zones' are areas where hybrid and contact zones of multiple taxa are clustered. Such zones have been regarded as strong evidence for allopatric divergence by proponents of the Pleistocene forest refugia theory, a vicariance hypothesis frequently used to explain diversification in the Amazon basin. A central prediction of the refugia and other vicariance theories is that the taxa should

  11. Palaeozoic history of the Armorican Massif: Models for the tectonic evolution of the suture zones

    E-print Network

    Déverchère, Jacques

    of the suture zones Michel Ballèvre a,*, Valérie Bosse b , Céline Ducassou a , Pavel Pitra a a Géosciences Rennes (UMR-CNRS 6118), université de Rennes-1, 35042 Rennes cedex, France b Laboratoire magmas et or because these sediments were removed by eros

  12. Aortic Valve Replacement Using Continuous Suture Technique in Patients with Aortic Valve Disease

    PubMed Central

    Kim, Jong Hun; Park, Hyun Kyu; Kim, Kyung Hwa; Kim, Min Ho; Kuh, Ja Hong; Jo, Jung Ku

    2013-01-01

    Background The continuous suture (CS) technique has several advantages as a method for simple, fast, and secure aortic valve replacement (AVR). We used a simple CS technique without the use of a pledget for AVR and evaluated the surgical outcomes. Materials and Methods Between October 2007 and 2012, 123 patients with aortic valve disease underwent AVR alone (n=28) or with other concomitant cardiac procedures (n=95), such as mitral, tricuspid, or aortic surgery. The patients were divided into two groups: the interrupted suture (IS) group (n=47), in which the conventional IS technique was used, and the CS group (n=76), in which the simple CS technique was used. Results There were two hospital deaths (1.6%), which were not related to the suture technique. There were no significant differences in cardiopulmonary bypass time or aortic cross-clamp time between the two groups for AVR alone or AVR with concomitant cardiac procedures. In the IS group, two patients had prosthetic endocarditis and one patient experienced significant perivalvular leak. These patients underwent reoperations. In the CS group, there were no complications related to the surgery. Postoperatively, the two groups had similar aortic valve gradients. Conclusion The simple CS method is useful and secure for AVR in patients with aortic valve disease, and it may minimize surgical complications, as neither pledgets nor braided sutures are used. PMID:24003405

  13. Students Graduating with Distinction Kelly Adamski, Pediatric coronal suture fiber alignment and the

    E-print Network

    Students Graduating with Distinction Kelly Adamski, Pediatric coronal suture fiber alignment of the Zebrafish Gut (Dr. Michel Bagnat, Department of Cell Biology, Duke University Medical Center) Michael Jay, Department of Cell Biology, Duke University Medical Center) Robert Diep*, Glucose transporter expression

  14. Resistance and Stability of A New Method for Bonding Biological Materials Using Sutures and Biological Adhesives

    Microsoft Academic Search

    J. M. García Paéz; A. Carrera Sanmartín; E. Jorge Herrero; I. Millan; A. Cordon; A. Rocha; M. A. Maestro; G. Téllez; J. L. Castillo-Olivares

    2005-01-01

    The valve leaflets of cardiac bioprostheses are secured and shaped by sutures which, given their high degree of resistance and poor elasticity, have been implicated in the generation of stresses within the leaflets, contributing to the failure of the bioprostheses. Bioadhesives are bonding materials that have begun to be utilized in surgery, although there is a lack of experience in

  15. Medial rectus resection(s) with adjustable suture for intermittent exotropia of the convergence insufficiency type

    Microsoft Academic Search

    Dong Gyu Choi; Arthur L. Rosenbaum

    2001-01-01

    Background: The surgical results for intermittent exotropia of the convergence insufficiency type have been reported to be of varying success. The purpose of this study is to evaluate the surgical results of medial rectus muscle (MR) resection(s) with adjustable suture for this condition. Methods: Twenty-one consecutive patients with intermittent exotropia of the convergence insufficiency type were included in this retrospective

  16. 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.

  17. 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. PMID:24943468

  18. Management of pain and sublingual hematoma caused by suture irritation after implant surgery: A clinical report.

    PubMed

    Bidra, Avinash S

    2015-05-01

    Hematoma in the sublingual region is an adverse consequence of implant surgery in the mandibular posterior region. Improved knowledge and understanding of the anatomy as well as the use of advanced radiographic imaging have all contributed to minimizing adverse surgical complications in this region. Delayed sublingual hematoma caused by suture irritation after implant surgery has not previously been reported. This article describes the management of a patient with a delayed sublingual hematoma after implant surgery in the posterior mandible had been performed. No evidence of encroachment of the vascular structures was noted at the time of implant surgery. However, at a 48-hour follow-up, the patient presented with severe pain and irritation of the sublingual mucosa, along with extravasation and a collection of blood in the sublingual region. Based on the patient's symptoms and clinical signs, the source of the problem was determined to be the stiff tags of polypropylene suture, which had been used to attain primary closure of the surgical flaps. The situation was conservatively and successfully managed by the use of a custom soft tissue guard to protect the patient's sublingual mucosa and the tongue from the stiff suture tags. Various suture materials and measures for preventing and managing similar situations are discussed in this article. PMID:25749082

  19. 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

  20. The threshold for air leak: stapled versus sutured human bronchi, an experimental study

    Microsoft Academic Search

    A El-Gamel; G. M. K Tsang; D. C. T Watson

    1999-01-01

    Background: Little is known about the integrity of staple-closure of the bronchus and its tolerance to normal mechanical stresses (cough, sneezing, etc.) in the immediate early post-operative period. There are few studies which tested the mechanical strength of stapled bronchial closure compared with manually closed bronchi using the threshold for fluid leak across the bronchial suture line which differs from

  1. An original balloon-expanding urethral suture guide for radical prostatectomy.

    PubMed

    Da Pozzo, L F; Colombo, R; Montorsi, F; Guazzoni, G; Rigatti, P

    1995-10-01

    Between August 1991 and July 1994, an original balloon-expanding urethral suture guide (24 F) was used in 157 consecutive cases of radical retropubic prostatectomy. Both the instrument and its clinical use are described. This guide guarantees good intraoperative exposure of the sectioned urethral stump during vesical reanastomosis, thus improving the technical feasibility of radical prostatectomy. PMID:7571230

  2. Tissue reactivity and degradation patterns of absorbable vascular ligating clips implanted in peritoneum and rectus fascia.

    PubMed

    Chegini, N; Metz, S A; Masterson, B J

    1990-07-01

    Absorbable vascular ligating clips are finding increasing use in intraabdominal surgery. We report the results of a light and scanning electron microscope investigation of the tissue reactivity and clip degradation patterns of two such materials, Absolok (polydioxanone) and Lactomer (copolymer of glycolic and lactic acid), implanted in the fascia and peritoneum of rabbits for intervals of 2 to 70 days. Cellular response to the clips, defined as the number of inflammatory cells/10(4) microns 2, was maximum at day 4 postimplantation, then gradually declined as the duration of implantation increased. This pattern, seen with both types of clips, was similar to that seen with polydioxanone (PDS) suture, but significantly greater than that associated with polypropylene (Prolene) suture. Although cellular response to the clips was greater in peritoneum than in fascia, especially on two occasions associated with adhesion formation, this was not statistically significant. Based on our morphological observations, the signs of clip degradation which were indicated by the appearance of surface crazing and cracks occurred earlier in peritoneum than in fascia. PMID:2118910

  3. Adhesion formation to the uterine horn of the rat in response to nylon and a new absorbable clip.

    PubMed

    Lavy, G; Graebe, R A; Oelsner, G; Boyers, S P; DeCherney, A H

    1987-03-01

    We have evaluated the tissue reactivity as manifested by adhesion formation to the uterine horn of the rat in response to a new absorbable surgical clip. A standard lesion on the uterine horn was created and repaired with either nylon sutures or an absorbable clip. Adhesion formation to the operative site was evaluated using a point based grading system, seven, 21 and 120 days postoperatively. A statistically significant increase in adhesion formation and their severity was seen on the uterine horns repaired with the surgical clips. The adhesions did not improve with time. In two instances, abscesses were formed around the clips. The use of the surgical clips in the peritoneal cavity needs to be investigated further. Their use in women in the reproductive age group who wish to preserve their reproductive potential is discouraged. PMID:3824109

  4. 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

  5. Suture Distension of Schlemm's Canal in Canaloplasty: An Anterior Segment Imaging Study

    PubMed Central

    Brandao, Livia M.; Schötzau, Andreas; Grieshaber, Matthias C.

    2015-01-01

    Purpose. The object of this study was to investigate the role of the suture stent regarding its impact on reduction of intraocular pressure (IOP) in canaloplasty based on the distension of the inner wall of Schlemm's canal. Methods. Nineteen glaucoma patients who underwent canaloplasty with successful positioning of the tensioning suture were included. The measurements were analyzed using linear mixed models, with the means adjusted to IOP, age, cup-to-disc ratio, and time of follow-up. Results. Mean follow-up time was 27.6 months (SD 10.5). Mean intraocular pressure (IOP) was 24.6?mmHg (SD 5.29), 13.8 (SD 2.65), and 14.5 (SD 0.71) before surgery, at 12 months, and at 36 months after surgery, respectively. 57.9% of patients had no medication at last evaluation. Differences and variations of measurements between the devices over a time of 12 months were not significant (p = 0.15 to 0.98). Some angles of distension associated with the suture stent inside SC were predictive for IOP reduction (p < 0.03 to < 0.001), but not for final IOP (p = 0.64 to 0.96). Conclusion. The angles of the inner wall of Schlemm's canal generated by the suture stent were comparable between OCT and UBM and did not change significantly over time. There was a tendency towards a greater distension of Schlemm's canal, when the difference was larger between pre- and postoperative IOP, suggesting the tensioning suture may contribute to IOP reduction. PMID:26078874

  6. 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.

  7. Progressive Myopia and Lid Suture Myopia are Explained by the Same Feedback Process: a Mathematical Model of Myopia

    PubMed Central

    Medina, Antonio; Greene, Peter R.

    2015-01-01

    Objective Progressive myopia in humans and lid-sutured myopia in primates have been considered to be different processes. This report seeks to establish the connection between progressive myopia in humans and lid suture myopia in macaque monkeys. Methods We followed the axial length of 4 lid-sutured macaque monkeys over an 18 month period. Their axial length is directly related to myopia. We also studied the myopia progression in corrected human subjects. Macaques and humans exhibit a linear time course of myopia progression when lid-sutured or corrected with lenses, respectively. Results A linear progression is observed in lid-sutured eyes of four macaques, r = 0.94, p < 0.05. Human progressive myopia and lid-suture myopia can be modeled by the same feedback process. In both cases the functional equivalent is the opening of the feedback loop. Conclusions The open loop feedback process predicts a linear progression of myopia. This prediction was confirmed in human subjects and it is now confirmed in our macaque subjects. This process also explains the very rapid rate of myopia progression of lid sutured eyes. PMID:26042228

  8. The red-eared slider turtle carapace under fatigue loading: The effect of rib-suture arrangement.

    PubMed

    Achrai, Ben; Daniel Wagner, H

    2015-08-01

    Biological structures consisting of strong boney elements interconnected by compliant but tough collagenous sutures are abundantly found in skulls and shells of, among others, armadillos, alligators, turtles and more. In the turtle shell, a unique arrangement of alternating rigid (rib) and flexible (suture) elements gives rise to superior mechanical performance when subjected to low and high strain-rate loadings. However, the resistance to repeated load cycling - fatigue - of the turtle shell has yet to be examined. Such repeated loading could approximately simulate the consecutive high-stress bending loads exerted during (a predator) biting or clawing. In the present study flexural high-stress cyclic loads were applied to rib and suture specimens, taken from the top dorsal part of the red-eared slider turtle shell, termed carapace. Subsequently, to obtain a more complete and integrated fatigue behavior of the carapace, specimens containing a complex alternating rib-suture-rib-suture-rib configuration were tested as well. Although the sutures were found to be the least resistant to repeated loads, a synergistic effect was observed for the complex specimens, displaying improved fatigue durability compared to the individual (suture or even rib) constituents. This study may assist in the design of future high-stress fatigue-resistant materials incorporating complex assemblies of rigid and flexible elements. PMID:26042699

  9. 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

  10. Laser welding versus suturing in tunica vaginalis and venous patch graft corporoplasty.

    PubMed

    Kirsch, A J; Chang, D T; Miller, M I; Connor, J P; Hensle, T W; Shabsigh, R

    1995-08-01

    Congenital penile curvature may result from corporeal disproportion in nearly 40% of cases, while in adults scarring of the corporeal bodies or periurethral fibrosis accounts for the majority of cases. Some surgeons advocate lengthening the fibrosed corporeal bodies by excising tunica albuginea and grafting such defects to straighten the penis. Tunica vaginalis, dermis, dorsal vein and lyophilized dura have been used for this purpose. Traditionally, these graft biomaterials have been sutured to the tunica albuginea. We assessed the feasibility, short-term safety and efficacy of diode laser tissue welding using albumin based solder and indocyanine green dye to perform patch graft corporoplasty in the dog. Ten animals were subjected to bilateral transverse excision of 1 x 2 cm. sections of tunica albuginea. Corporoplasty was performed using grafts composed of saphenous vein (5) or tunica vaginalis (5). Microsurgical repair with 7-zero polydioxanone suture (10) was compared to contralateral laser welded repair (10) by recording operative time, initial and short-term bursting pressures (mean plus or minus standard deviation) and histological analysis. Operative time on the laser side (9.8 +/- 2.3 minutes) was significantly shorter (p < 0.05) than on the suture side (17.1 +/- 5.1 minutes). Leak pressures, initially (laser 105.7 +/- 23.8 mm. Hg versus suture 35.3 +/- 8.0 mm. Hg), at 3 to 5 days (greater than 333.3 +/- 62.4 mm. Hg versus 136.6 +/- 39.4 mm. Hg) and at 7 to 10 days (greater than 397.8 +/- 39.8 mm. Hg versus 191.5 +/- 46.4 mm. Hg) were higher (p < 0.05) in the laser side compared to controls. Graft failure (necrosis) occurred in 3 repairs (2 laser on day 4 and 1 suture on day 10). Viable tissue with minimal differences in foreign body reaction between groups was observed in the remaining grafts. We conclude that laser welded patch graft corporoplasty using tunica vaginalis or vein is easy to perform, and provides excellent initial and short-term leak pressures. The use of laser welding in conjunction with suturing may be beneficial in corporoplasty for congenital or acquired penile curvature. PMID:7609197

  11. Mulitlayered Nanostructured Broad Band Absorber

    NASA Astrophysics Data System (ADS)

    Corrigan, Timothy; Ide, Benjamin

    2013-03-01

    Wasted energy in the form of heat is perhaps the largest source of lost energy making many power systems inefficient. Systems designed to convert heat into useful energy need a method of collecting the heat. We previously described a multilayer design with successive thin metallic and dielectric (non-metal and transparent) layers, where each successive metallic layer absorbs a small fraction of the radiation. However, the regular thickness of the dielectric layer causes reflection peaks, or regions where no absorption occurs. In this work we describe a similar design where we eliminated the undesirable reflection peaks using varying thicknesses of the dielectric layer.

  12. 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.

  13. 21 CFR 886.3300 - Absorbable implant (scleral buckling method).

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...false Absorbable implant (scleral buckling method). 886.3300 Section...3300 Absorbable implant (scleral buckling method). (a) Identification. An absorbable implant (scleral buckling method) is a device intended...

  14. 21 CFR 886.3300 - Absorbable implant (scleral buckling method).

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...false Absorbable implant (scleral buckling method). 886.3300 Section...3300 Absorbable implant (scleral buckling method). (a) Identification. An absorbable implant (scleral buckling method) is a device intended...

  15. 21 CFR 886.3300 - Absorbable implant (scleral buckling method).

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...false Absorbable implant (scleral buckling method). 886.3300 Section...3300 Absorbable implant (scleral buckling method). (a) Identification. An absorbable implant (scleral buckling method) is a device intended...

  16. 21 CFR 886.3300 - Absorbable implant (scleral buckling method).

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ...false Absorbable implant (scleral buckling method). 886.3300 Section...3300 Absorbable implant (scleral buckling method). (a) Identification. An absorbable implant (scleral buckling method) is a device intended...

  17. Calvarial and sutural re-development following craniectomy in the neonatal rabbit.

    PubMed Central

    Mabbutt, L W; Kokich, V G

    1979-01-01

    In the present investigation extensive calvariectomy was performed on neonatal rabbits and the subsequent regeneration of the calvarium was followed grossly, radiographically and histologically. The results indicate that regeneration of the calvarium is a gradual process which exhibits a definite pattern and rate. Furthermore, although the sutural articulations re-develop in their proper anatomical positions and exhibit normal histological structure, they tend to synostose earlier than controls. Of perhaps greater biological significance is the apparent importance of the periosteal envelope during the regenerative process. Maintenance of dural integrity during operation, and the re-establishment of pericranial continuity post-operatively, seem to be essential for restoration of normal sutural and skeletal architecture. Images Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig. 10 Fig. 11 Fig. 12 Fig. 13 Fig. 14 Fig. 15 Fig. 16 PMID:500496

  18. Comparison of laser-assisted fibrinogen bonding to sutured closure of umbilical vein graft

    NASA Astrophysics Data System (ADS)

    Oz, Mehmet C.; Souza, John E.; Williams, Matthew R.; Dardik, Herbert; Bass, Lawrence S.; Treat, Michael R.; Nowygrod, Roman

    1993-07-01

    Despite success with autologous tissue welding, laser welding of synthetic vascular prostheses has not been possible. The graft material appears inert and fails to allow the collagen breakdown and electrostatic bonding which results in tissue welding. In order to develop a laser welding system for graft material, we repaired gluataldehyde-tanned human umbilical cord vein graft incisions using laser-assisted fibrinogen bonding (LAFB) technology. Modified umbilical vein graft was incised transversely (1.2 cm). Incisions were repaired using sutures, laser energy alone, or LAFB. In vivo evaluation of umbilical graft bonding with canine arteries demonstrates that LAFB can reliably reinforce sutured anastomoses. The described system for bonding graft material with laser exposed fibrinogen may allow creation or reinforcement of vascular anastomoses in procedures where use of autologous tissue is not feasible.

  19. Microvascular anastomoses. A comparative study of fibrinogen adhesive and interrupted suture techniques.

    PubMed

    Bowen, C V; Leach, D H; Crosby, N L; Reynolds, R

    1996-04-01

    A modified sleeve technique was developed for making microsurgical anastomoses using a commercially produced fibrinogen adhesive called Tisseel. A controlled study was then carried out to compare the new fibrinogen adhesive anastomoses with conventional suture anastomoses in a bilateral groin flap model using 50 consecutive rabbits. Statistical analysis of the results indicated that flap survival rate and vascular patency rate were comparable for the two techniques. The fibrinogen adhesive anastomoses took less time to complete and, subjectively, were less difficult technically. The suture anastomoses were more versatile. Histologic studies revealed that the adhesive did not flow through the sleeve into the lumen, and that, although there was a brief inflammatory response associated with healing, this inflammation was very localized and did not involve the inner layers of the vessel wall or lumen. It was concluded that the new technique was a useful addition to techniques already available. PMID:8628774

  20. The Changning-Menglian suture zone; a segment of the major Cathaysian-Gondwana divide in Southeast Asia

    Microsoft Academic Search

    Haoruo Wu; C. A. Boulter; Baojia Ke; D. A. V. Stow; Zhongcheng Wang

    1995-01-01

    In southwest China, the major Cathaysian-Gondwana divide (the Palaeo-Tethyan suture) is very well delineated by a narrow north-south zone of oceanic siliceous sedimentary rocks and dismembered ophiolite complexes including probable remains of reef-capped oceanic islands. The location of this zone, the Changning-Menglian suture, is not well appreciated in the English language literature, probably because of the failure to recognise the

  1. 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

    A COMPARISON OF CANINE PRESCROTAL URETHROSTOMIES WHICH HEAL BY SECOND INTENTION AND URETHROTOMIES SUTURED WITH POLYGLACTIN 910 OR POLYDIOXANONE A Thesis by 'WILLIAM JAMES WEBER Submitted to the Graduate College of Texas Ail M Uni vers i ty... 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...

  2. New UPb and Rb-Sr ages from suture zone between Istanbul and Sakarya terranes, northwest Turkey

    Microsoft Academic Search

    Kenan Akbayram; Aral Okay; Muharrem Satir

    2010-01-01

    We provide new isotopic data from the Intra-Pontide Suture Zone, between the Sakarya and Istanbul terranes at the west of Armutlu Peninsula. Istanbul and Sakarya terranes show different geological histories, as reflected in their stratigraphic record, and are juxtaposed along the Intra-Pontide suture. The new U\\/Pb zircon and Rb\\/Sr mica ages come from west of Armutlu Peninsula and Almacik Mountains

  3. Gondwana and Cathaysian blocks, palaeotethys sutures and cenozoic tectonics in South-east Asia

    Microsoft Academic Search

    Charles S. Hutchison

    1994-01-01

    The Triassic Indosinian Orogeny followed extinction of the Palaeotethys Ocean resulting in suturing of Gondwana affinity and Cathaysian blocks.The Gondwana affinity Sinoburmalaya block of Peninsular Malaysia, characterized by Carboniferous—Permian mudstones containing glacial dropstones and sparse fauna and flora, is traced extensively into Sumatra. This mudstone facies is flanked on the east by a sandstone-dominated facies and by carbonate localized in

  4. 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

  5. Intraosseous foreign body granuloma in rotator cuff repair with bioabsorbable suture anchor

    Microsoft Academic Search

    T. Nusselt; S. Freche; H.-M. Klinger; M. H. Baums

    2010-01-01

    Biodegradable implants lead to problems such as cyst formation, soft-tissue inflammation, loose implant fragments or local\\u000a osteolysis. This report represents the first published case of an intraosseous foreign body granuloma in the humeral head\\u000a after arthroscopic rotator cuff tear fixation with a poly-l-lactide (PLLA) suture anchor. A 48-year-old female patient presented with pain in her right shoulder. A refixation of

  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. Estimation of stature from cranial sutures in a South Indian male population

    Microsoft Academic Search

    P. P. Jagadish Rao; Jagadish Sowmya; K. Yoganarasimha; Ritesh G. Menezes; Tanuj Kanchan; R. Aswinidutt

    2009-01-01

    The aim of this study was to investigate the possibility of estimating height from length of coronal and sagittal sutures\\u000a of the skull for the positive identification of the height in forensic investigations concerned with fragmentary skeletal\\u000a remains. The study was conducted on 87 male bodies subjected to medicolegal autopsy in the Department of Forensic Medicine,\\u000a Kasturba Medical College, Manipal,

  8. Neonatal neurological disorders involving the brainstem: neurosonographic approaches through the squamous suture and the foramen magnum

    Microsoft Academic Search

    Yi-Fang Tu; Cheng-Yu Chen; Yuh-Jey Lin; Ying-Chao Chang; Chao-Ching Huang

    2005-01-01

    Brainstem damage which often indicates a critical condition is usually underestimated by trans-anterior-fontanel neurosonography (NS) owing to the far-field limitations. Instead, NS alternately scanning through the squamous suture of the temporal bones and the foramen magnum could provide a better visualization of the brainstem structures. The NS characteristics of brainstem lesions caused by various neonatal neurological disorders, such as hypoxic–ischemic

  9. 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

  10. Strikingly variable divergence times inferred across an Amazonian butterfly ‘suture zone’

    PubMed Central

    Whinnett, Alaine; Zimmermann, Marie; Willmott, Keith R; Herrera, Nimiadina; Mallarino, Ricardo; Simpson, Fraser; Joron, Mathieu; Lamas, Gerardo; Mallet, James

    2005-01-01

    Suture zones’ are areas where hybrid and contact zones of multiple taxa are clustered. Such zones have been regarded as strong evidence for allopatric divergence by proponents of the Pleistocene forest refugia theory, a vicariance hypothesis frequently used to explain diversification in the Amazon basin. A central prediction of the refugia and other vicariance theories is that the taxa should have a common history so that divergence times should be coincident among taxa. A suture zone for Ithomiinae butterflies near Tarapoto, NE Peru, was therefore studied to examine divergence times of taxa in contact across the zone. We sequenced 1619?bp of the mitochondrial COI/COII region in 172 individuals of 31 species from across the suture zone. Inferred divergence times differed remarkably, with divergence between some pairs of widespread species (each of which may have two or more subspecies interacting in the zone, as in the genus Melinaea) being considerably less than that between hybridizing subspecies in other genera (for instance in Oleria). Our data therefore strongly refute a simple hypothesis of simultaneous vicariance and suggest that ongoing parapatric or other modes of differentiation in continuous forest may be important in driving diversification in Amazonia. PMID:16271979

  11. Strikingly variable divergence times inferred across an Amazonian butterfly 'suture zone'.

    PubMed

    Whinnett, Alaine; Zimmermann, Marie; Willmott, Keith R; Herrera, Nimiadina; Mallarino, Ricardo; Simpson, Fraser; Joron, Mathieu; Lamas, Gerardo; Mallet, James

    2005-12-01

    'Suture zones' are areas where hybrid and contact zones of multiple taxa are clustered. Such zones have been regarded as strong evidence for allopatric divergence by proponents of the Pleistocene forest refugia theory, a vicariance hypothesis frequently used to explain diversification in the Amazon basin. A central prediction of the refugia and other vicariance theories is that the taxa should have a common history so that divergence times should be coincident among taxa. A suture zone for Ithomiinae butterflies near Tarapoto, NE Peru, was therefore studied to examine divergence times of taxa in contact across the zone. We sequenced 1619bp of the mitochondrial COI/COII region in 172 individuals of 31 species from across the suture zone. Inferred divergence times differed remarkably, with divergence between some pairs of widespread species (each of which may have two or more subspecies interacting in the zone, as in the genus Melinaea) being considerably less than that between hybridizing subspecies in other genera (for instance in Oleria). Our data therefore strongly refute a simple hypothesis of simultaneous vicariance and suggest that ongoing parapatric or other modes of differentiation in continuous forest may be important in driving diversification in Amazonia. PMID:16271979

  12. 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

  13. The western Idaho suture zones meets the central Montana trough: A soft indentee model

    SciTech Connect

    Strayer, L.M. (Univ. of Minnesota, Minneapolis, MN (United States). Dept. of Geology and Geophysics)

    1993-04-01

    The western Idaho suture zone is defined by a thin (5--25 km) belt of mylonitic granitoid rocks formed during large-scale, Cretaceous, dextral strike-slip activity. It marks an initial subvertical boundary between accreted oceanic terranes and cratonic North America. Deformation style along the suture zone changes abruptly from transpressions on the southern segment, to west-vergent thrusting on the northern segment, the change occurring near Slate Ck. The northern segment appears to be a structural and metamorphic culmination-the Clearwater culmination-that acts as the mylonitic root-zone of the Rapid River thrust, which splays off to the SW. The northern and southern extents of the Clearwater culmination coincide with the north and south boundaries of the Central Montana Trough (CMT), an east-west trough containing thick packages of Proterozoic through Mesozoic strata. The CMT has been interpreted as an aulacogen, and as such must have extended to the western edge of N. America after Proterozoic rifting. The change in structural style from pure-shear dominated dextral transpression south of Slate Ck. to west-directed thrusting north of Slate Ck. is likely due to the strong rheologic contrast caused by the intersection of the western Idaho suture zone and the CMT. The CMT acts as a soft-indented', focusing the collisional deformation of the Seven Devils/Wallowa terrain eastward into the unusually thick Proterozoic through Mesozoic rocks of the CMT.

  14. Tunneling and Suture of Thoracic Epidural Catheters Decrease the Incidence of Catheter Dislodgement

    PubMed Central

    Schmitz, Andrea; Weiss, Martin; Rabenalt, Stefanie; MacKenzie, Colin

    2014-01-01

    Background. Dislocation of epidural catheters (EC) is associated with early termination of regional analgesia and rare complications like epidural bleeding. We tested the hypothesis that maximum effort in fixation by tunneling and suture decreases the incidence of catheter dislocation. Methods. Patients scheduled for major surgery (n = 121) were prospectively randomized in 2 groups. Thoracic EC were subcutaneously tunneled and sutured (tunneled) or fixed with adhesive tape (taped). The difference of EC length at skin surface level immediately after insertion and before removal was determined and the absolute values were averaged. Postoperative pain was evaluated by numeric rating scale twice daily and EC tips were screened microbiologically after removal. Results. Both groups did not differ with respect to treatment duration (tunneled: 109 hours ±46, taped: 97 ± 37) and postoperative pain scores. Tunneling significantly reduced average extent (tunneled: 3?mm ±7, taped: 10 ± 18) and incidence of clinically relevant EC dislocation (>20?mm, tunneled: 1/60, taped: 9/61). Bacterial contamination showed a tendency to be lower in patients with tunneled catheters (8/59, taped: 14/54, P = 0.08). Conclusion. Thorough fixation of EC by tunneling and suturing decreases the incidence and extent of dislocation and potentially even that of bacterial contamination. PMID:25140337

  15. Oblique sinistral transpression in the Arabian shield: The timing and kinematics of a Neoproterozoic suture zone

    USGS Publications Warehouse

    Johnson, P.R.; Kattan, F.

    2001-01-01

    The Hulayfah-Ad Dafinah-Ruwah fault zone is a belt of highly strained rocks that extends in a broad curve across the northeastern Arabian shield. It is a subvertical shear zone, 5-30 km wide and over 600 km long, and is interpreted as a zone of oblique sinistral transpression that forms the suture between the Afif terrane and the Asir-Jiddah-Hijaz-Hulayfah superterrane. Available data suggest that the terranes began to converge sometime after 720 Ma, were in active contact at about 680 Ma, and were in place, with suturing complete, by 630 Ma, The fault zone was affected by sinistral horizontal and local vertical shear, and simultaneous flattening and fault-zone-parallel extension. Structures include sinistral sense-of-shear indicators, L-S tectonite, and coaxial stretching lineations and fold axes. The stretching lineations switch from subhorizontal to subvertical along the fault zone indicating significant variation in finite strain consistent with an origin by oblique transpression. The sense of shear on the fault zone suggests sinistral trajectories for the converging terranes, although extrapolating the shear sense of the suture zone to infer far-field motion must be done with caution. The amalgamation model derived from the chronologic and structural data for the fault zone modifies an existing model of terrane amalgamation and clarifies the definitions of two deformational events (the Nabitah orogeny and the Najd fault system) that are widely represented in the Arabian shield. ?? 2001 Elsevier Science B.V.

  16. 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

    2010-08-01

    Size reductions of acoustic transmitters implanted in migrating juvenile salmonids have resulted in the use of a shorter incision - one that may warrant only one suture for closure. However, it is not known if a single suture will sufficiently hold the incision closed when fish are decompressed and outward pressure is placed on the surgical site during passage of hydroelectric dams. The objectives of this study were to evaluate five response variables in juvenile Chinook salmon subjected to simulated turbine passage. Fish were implanted with an acoustic transmitter (0.43 g in air) and a passive integrated transponder tag (0.10 g in air); incisions (6 mm) were closed with either one or two sutures. Following exposure, no transmitters were expelled. In addition, suture and incision tearing and mortal injury did not differ between treatment and control fish. Viscera expulsion was higher in treatment (12%) than control (1%) fish. The higher incidence of viscera expulsion through single-suture incisions warrants concern. Consequently, the authors do not recommend using one suture to close 6-mm incisions associated with acoustic transmitter implantation when juvenile salmonids may be exposed to turbine passage.

  17. 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.

  18. Clinical and Radiological Evaluation after Arthroscopic Rotator Cuff Repair Using Suture Bridge Technique

    PubMed Central

    Lee, Kwang Won; Bae, Kyoung Wan; Choy, Won Sik

    2013-01-01

    Background We retrospectively assessed the clinical outcomes and investigated risk factors influencing retear after arthroscopic suture bridge repair technique for rotator cuff tear through clinical assessment and magnetic resonance arthrography (MRA). Methods Between January 2008 and April 2011, sixty-two cases of full-thickness rotator cuff tear were treated with arthroscopic suture bridge repair technique and follow-up MRA were performed. The mean age was 56.1 years, and mean follow-up period was 27.4 months. Clinical and functional outcomes were assessed using range of motion, Korean shoulder score, Constant score, and UCLA score. Radiological outcome was evaluated with preoperative and follow-up MRA. Potential predictive factors that influenced cuff retear, such as age, gender, geometric patterns of tear, size of cuff tear, acromioplasty, fatty degeneration, atrophy of cuff muscle, retraction of supraspinatus, involved muscles of cuff and osteolysis around the suture anchor were evaluated. Results Thirty cases (48.4%) revealed retear on MRA. In univariable analysis, retear was significantly more frequent in over 60 years age group (62.5%) than under 60 years age group (39.5%; p = 0.043), and also in medium to large-sized tear than small-sized tear (p = 0.003). There was significant difference in geometric pattern of tear (p = 0.015). In multivariable analysis, only age (p = 0.036) and size of tear (p = 0.030) revealed a significant difference. The mean active range of motion for forward flexion, abduction, external rotation at the side and internal rotation at the side were significantly improved at follow-up (p < 0.05). The mean Korean shoulder score, Constant score, and UCLA score increased significantly at follow-up (p < 0.01). The range of motion, Korean shoulder score, Constant score, and UCLA score did not differ significantly between the groups with retear and intact repairs (p > 0.05). The locations of retear were insertion site in 10 cases (33.3%) and musculotendinous junction in 20 cases (66.7%; p = 0.006). Conclusions Suture bridge repair technique for rotator cuff tear showed improved clinical results. Cuff integrity after repair did not affect clinical results. Age of over 60 years and size of cuff tear larger than 1 cm were factors influencing rotator cuff retear after arthroscopic suture bridge repair technique. PMID:24340151

  19. 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.

  20. Effects of suture material and ultrasonic transmitter size on survival, growth, wound healing, and tag expulsion in rainbow trout

    USGS Publications Warehouse

    Ivasauskas, Tomas 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.

  1. 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.

  2. Advanced Reflector and Absorber Materials (Fact Sheet)

    SciTech Connect

    Not Available

    2010-08-01

    Fact sheet describing NREL CSP Program capabilities in the area of advanced reflector and absorber materials: evaluating performance, determining degradation rates and lifetime, and developing new coatings.

  3. Loss-of-Function of Gli3 in Mice Causes Abnormal Frontal Bone Morphology and Premature Synostosis of the Interfrontal Suture

    PubMed Central

    Veistinen, Lotta; Takatalo, Maarit; Tanimoto, Yukiho; Kesper, Dörthe A.; Vortkamp, Andrea; Rice, David P. C.

    2012-01-01

    Greig cephalopolysyndactyly syndrome (GCPS) is an autosomal dominant disorder with polydactyly and syndactyly of the limbs and a broad spectrum of craniofacial abnormalities. Craniosynostosis of the metopic suture (interfrontal suture in mice) is an important but rare feature associated with GCPS. GCPS is caused by mutations in the transcription factor GLI3, which regulates Hedgehog signaling. The Gli3 loss-of-function (Gli3Xt-J/Xt-J) mouse largely phenocopies the human syndrome with the mice exhibiting polydactyly and several craniofacial abnormalities. Here we show that Gli3Xt-J/Xt-J mice exhibit ectopic ossification in the interfrontal suture and in the most severe cases the suture fuses already prior to birth. We show that abnormalities in frontal bones occur early in calvarial development, before the establishment of the interfrontal suture. It provides a model for the metopic suture pathology that can occur in GCPS. PMID:22563320

  4. 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

  5. Effects of strontium ranelate on bone formation in the mid-palatal suture after rapid maxillary expansion

    PubMed Central

    Zhao, Shuya; Wang, Xuxia; Li, Na; Chen, Yun; Su, Yuran; Zhang, Jun

    2015-01-01

    Background The aim of this experimental study was to investigate the effects of strontium ranelate on bone regeneration in the mid-palatal suture in response to rapid maxillary expansion (RME). Methods Thirty-six male 6-week-old Wistar rats were randomly divided into three groups, ie, an expansion only (EO) group, an expansion plus strontium ranelate (SE) group, and a control group. An orthodontic appliance was set between the right and left upper molars of rats with an initial expansive force of 0.98 N. Rats in the SE group were administered strontium ranelate (600 mg/kg body weight) and then euthanized in batches on days 4, 7, and 10. Morphological changes in the mid-palatal suture were investigated using micro-computed tomography and hematoxylin and eosin staining after RME. Bone morphogenetic protein-2 expression in the suture was also examined to evaluate bone formation in the mid-palatal suture. Image-Pro Plus software was then used to determine the mean optical density of the immunohistochemical images. Analysis of variance was used for statistical evaluation at the P<0.05 level. Results With expansive force, the mid-palatal suture was expanded, but there was no statistically significant difference (P>0.05) between the SE and EO groups. The bone volume of the suture decreased after RME, but was higher in the SE group than in the EO group on days 7 and 10. Further, expression of bone morphogenetic protein-2 in the SE group was higher than in the other two groups (P<0.05). Conclusion Strontium ranelate may hasten new bone formation in the expanded mid-palatal suture, which may be therapeutically beneficial in prevention of relapse and shortening the retention period after RME.

  6. A uniflow absorbent oil regenerator

    SciTech Connect

    Sidogin, V.P.; Babitsin, S.M.; Brodskii, E.V.; Gulyaev, V.M.; Khomin, V.T.

    1984-01-01

    The uniflow absorbent oil regenerator presented in this article has been developed and introduced at the Dnepropetrovsk Coking Plant in conjunction with the Dnepropetrovsk Chemical and Technological Institute. The body of the device is a convergent duct with a cylindrical neck and a diffuser. A conical oil receptacle and conical inserts are positioned in the convergent duct. A connecting pipe for gas input and a connecting pipe for injecting oil into a conical receptacle are placed on the upper end shield of the body. A swirler made out of inclined vanes which partly overlap inside is placed at the diffuser outlet. A cylinder, contained in a steam jacket with chokes for letting in steam and letting out condensate, is positioned under the diffuser. The gas-removal connecting pipe, mounted on a lower end shield of the device, is partially recessed inside the cylinder, and forms with its inside walls a collector for the annular section which is supplied with a connecting pipe for removal of the liquid phase (polymers).

  7. Absorbance Changes of Carotenoids in Different Solvents

    Microsoft Academic Search

    Lun-Yi Zang; Olaf Sommerburg; Frederik J. G. M van Kuijk

    1997-01-01

    Carotenoids are typically measured in tissues with the high performance liquid chromatography (HPLC) and quantitation is usually done by calibrating with stock solutions in solvents. Four carotenoids including lutein, zeaxanthin, lycopene and ?-carotene were dissolved in hexane and methanol respectively, and their absorbance characteristeris were compared. Lutein shows absorbance spectra that are almost independent of solvents at various concentrations. Spectra

  8. Absorbed radiation dose on LHC interconnects

    E-print Network

    Versaci, R; Vlachoudis, V; CERN. Geneva. ATS Department

    2011-01-01

    Here we present the results of our FLUKA simulations devoted to the evaluation of the peak dose absorbed by the busbar insulator in the LHC Interaction Region 7 interconnects. The peak dose absorbed by the cold magnet coils are also presented.

  9. 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

  10. Method of fabricating a solar absorber panel

    Microsoft Academic Search

    Severson

    1982-01-01

    A low-cost method of fabricating a solar absorber panel for use with a flat plate solar collector system is disclosed in which a plurality of formed elongated substantially u-shaped members are fixed in a predetermined configuration to the reverse side of a single sheet absorber member forming therewith hollow fluid passages or ducts. The fluid duct members are provided with

  11. SYNCHROTRON RADIATION ABSORBERS FOR HADRON COLLIDERS

    Microsoft Academic Search

    P. Bauer; K. Ewald; C. Darve; P. J. Limon; T. Nicol; N. Solyak; I. Terechkine; A. Barcikowski; J. Noonan; R. Rosenberg; E. Rotela; B. Rusthoven; S. Sharma

    We present the results of a design study of synchrotron radiation absorbers, or photon stops, conducted in the context of a recent study of a Very Large Hadron Collider (VLHC), (1). Photon stops protrude into the beam tube at the end of each bending magnet to absorb the synchrotron radiation emitted by the beams. They operate at room temperature and

  12. 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

  13. 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

  14. Staged endovascular occlusion of giant idiopathic renal arteriovenous fistula with platinum microcoils and silk suture threads.

    PubMed

    Gralino, B J; Bricker, Deborah L

    2002-07-01

    Large symptomatic aneurysmal renal arteriovenous (AV) fistulas usually present with a flank bruit, uncontrolled hypertension, and high-output cardiac failure. Traditionally, these have been treated surgically because of the risk of inadvertent pulmonary embolism with use of embolization techniques. The authors report a case of a giant renal AV fistula successfully treated with staged embolization with use of metallic coils and silk suture. This resulted in a graded reduction in the extreme flow through the fistula, followed by delayed thrombosis and cure of the patient's symptoms. PMID:12119337

  15. Facilitating endoscopic submucosal dissection: the suture-pulley method significantly improves procedure time and minimizes technical difficulty compared with conventional technique: an ex vivo study (with video)

    PubMed Central

    Aihara, Hiroyuki; Kumar, Nitin; Ryou, Marvin; Abidi, Wasif; Ryan, Michele B.; Thompson, Christopher C.

    2015-01-01

    Background The lack of countertraction in endoscopic submucosal dissection (ESD) results in increased technical demand and procedure time. Although the suture-pulley method for countertraction has been reported, its effectiveness compared with the traditional ESD technique remains unclear. Objective To objectively analyze efficacy of countertraction using the suture-pulley method for ESD. Design Prospective ex vivo animal study. Setting Animal laboratory. Interventions Twenty simulated gastric lesions were created in porcine stomachs by using a standard circular template 30 mm in diameter. In the control arm (n = 10), ESD was performed by using the standard technique. In the suture-pulley arm (N = 10), a circumferential incision was made, and an endoscopic suturing device was used to place the suture pulley. Main Outcome Measurements The primary outcome of this study was total procedure time. Results The median total procedure time with the suture-pulley method was significantly shorter than the traditional ESD technique (median, 25% to 75%, interquartile range [IQR]: 531 seconds [474.3–549.3 seconds] vs 845 seconds [656.3–1547.5 seconds], P < .001). The median time (IQR) for suture-pulley placement was 160.5 seconds (150.0–168.8 seconds). Although there was a significantly longer procedure time for proximal versus middle/lower stomach lesions with traditional ESD (median, 1601 seconds; IQR, 1547.5–1708.8 seconds vs median, 663 seconds; IQR, 627.5–681.8 seconds; P =.01), there was no significant difference in procedure time for lesions of various locations when using the suture-pulley method. Compared with traditional ESD, the suture-pulley method was less demanding in all categories evaluated by the NASA Task Load Index. Limitations Ex vivo study. Conclusions The suture-pulley method facilitates direct visualization of the submucosal layer during ESD and significantly reduces procedure time and technical difficulty. In addition, the benefit of the suture-pulley method was seen for both simple and more complicated ESDs. PMID:24679655

  16. Torsional vibration reduction using passive nonlinear absorbers

    NASA Astrophysics Data System (ADS)

    Shaw, Steven W.; Alsuwaiyan, Abdallah

    2000-04-01

    This paper considers the dynamic performance of systems of centrifugal pendulum vibration absorbers that are used to attenuate torsional vibrations in rotating systems. These absorbers, which can be found in certain IC engines and helicopter rotors, consist of movable masses whose centers of mass are kinematically restricted to move along prescribed paths relative to the rotor of interest. The most common choice for absorber paths are simple circles that are slightly mistuned from the desired order, so that undesirable nonlinear behaviors are avoided when the absorbers undergo large amplitude motions. In this work we consider a range of different path types and tunings, with the goal of optimizing performance over a wide operating range. This analytical study relies on a mathematical model of a rotor fitted with N identical, general-path absorbers, and utilizes perturbation techniques to obtain analytical estimates for the response of the rotor and the absorbers. The results are used to select path parameters based on selected performance measures, and the results are verified via simulation studies. It is shown that slightly overtuned cycloidal paths provide excellent vibration reduction characteristics and prevent the occurrence of nonlinear instabilities and vibration localization in the response of the absorbers.

  17. 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.

  18. Sutures - separated

    MedlinePLUS

    Arnold-Chiari malformation Battered child syndrome Bleeding inside the brain (intraventricular hemorrhage) Brain tumor Certain vitamin deficiencies Dandy-Walker malformation Down syndrome Hydrocephalus Infections that are ...

  19. Bricolage Suture

    E-print Network

    Wilson, Robert Justin

    2014-05-31

    into the future. The horses 15 3/4 TIME, page 2, continue stanza need feeding. My mother spreads the barbed wire fence between her boot and her forearm, and reminds me to count on my fingers and that my brother’s not coming back. As I stumble...

  20. The nonlinear piezoelectric tuned vibration absorber

    NASA Astrophysics Data System (ADS)

    Soltani, P.; Kerschen, G.

    2015-07-01

    This paper proposes a piezoelectric vibration absorber, termed the nonlinear piezoelectric tuned vibration absorber (NPTVA), for the mitigation of nonlinear resonances of mechanical systems. The new feature of the NPTVA is that its nonlinear restoring force is designed according to a principle of similarity, i.e., the NPTVA should be an electrical analog of the nonlinear host system. Analytical formulas for the NPTVA parameters are derived using the homotopy perturbation method. Doing so, a nonlinear generalization of Den Hartog’s equal-peak tuning rule is developed for piezoelectric vibration absorbers.

  1. Quadriceps tendon rupture: a biomechanical comparison of transosseous equivalent double-row suture anchor versus transosseous tunnel repair.

    PubMed

    Hart, Nathan D; Wallace, Matthew K; Scovell, J Field; Krupp, Ryan J; Cook, Chad; Wyland, Douglas J

    2012-09-01

    Quadriceps rupture off the patella is traditionally repaired by a transosseous tunnel technique, although a single-row suture anchor repair has recently been described. This study biomechanically tested a new transosseous equivalent (TE) double-row suture anchor technique compared with the transosseous repair for quadriceps repair. After simulated quadriceps-patella avulsion in 10 matched cadaveric knees, repairs were completed by either a three tunnel transosseous (TT = 5) or a TE suture anchor (TE = 5) technique. Double-row repairs were done using two 5.5 Bio-Corkscrew FT (fully threaded) (Arthrex, Inc., Naples, FL, USA) and two 3.5 Bio-PushLock anchors (Arthrex, Inc., Naples, FL, USA) with all 10 repairs done with #2 FiberWire suture (Arthrex, Inc., Naples, FL). Cyclic testing from 50 to 250 N for 250 cycles and pull to failure load (1 mm/s) were undertaken. Gap formation and ultimate tensile load (N) were recorded and stiffness data (N/mm) were calculated. Statistical analysis was performed using a Mann-Whitney U test and survival characteristics examined with Kaplan-Meier test. No significant difference was found between the TE and TT groups in stiffness (TE = 134 +/- 15 N/mm, TT = 132 +/- 26 N/mm, p = 0.28). The TE group had significantly less ultimate tensile load (N) compared with the TT group (TE = 447 +/- 86 N, TT = 591 +/- 84 N, p = 0.04), with all failures occurring at the suture eyelets. Although both quadriceps repairs were sufficiently strong, the transosseous repairs were stronger than the TE suture anchor repairs. The repair stiffness and gap formation were similar between the groups. PMID:23150161

  2. Nerve conduction, tactile sensibility, and the electromyogram after suture or compression of peripheral nerve: a longitudinal study in man.

    PubMed Central

    Buchthal, F; Kühl, V

    1979-01-01

    In three patients sequential studies were performed of sensory and motor conduction after complete section and suture of the median nerve at the wrist and in one patient after partial section of the nerve. The sensory potential evoked by stimuli to digits III and I and recorded proximal to the suture line at the wrist appeared after a delay of three to four months, corresponding to a growth rate of 1.5-2.0 mm per day. From early in the course of regeneration the sensory potential was dispersed in 40 components. In the adult patient the cumulative amplitude increased for two years slowly and thereafter at a two times faster rate. Amplitude and tactile sensibility were normal after 40 months, but the sensory potential was still five times more dispersed than normal. The overall increase in the amplitude of the sensory potentials in children aged 10 and 12 years was three times faster than in adults. In the adults and in the children the maximum sensory conduction velocity was 10-25% of normal. It then increased at 3% per month during the first two years, and thereafter 10 times slower. Forty months after suture in the adults and 13-19 months after suture in the children the conduction velocity had reached 65-75% of normal. The pattern of discrete electrical activity during voluntary effort and the prolonged duration of motor unit potentials indicate persistent enlargement of the reinnervated motor units by peripheral sprouting. The sensory potential recovered five times faster after a compressive nerve lesion than after section and suture as seen in another patient with an affection of the ulnar nerve at the elbow. Normal tactile sensibility was attained 10 times faster than after section and suture. Maximum sensory and motor condution velocity recovered within one year from 60-70% to 80-90% of normal. PMID:448383

  3. Anatomic Deltoid Ligament Repair with Anchor-to-Post Suture Reinforcement: Technique Tip

    PubMed Central

    Lack, William; Phisitkul, Phinit; Femino, John E.

    2012-01-01

    The deltoid ligament is the primary ligamentous stabilizer of the ankle joint. Both superficial and deep components of the ligament can be disrupted with a rotational ankle fracture, chronic ankle instability, or in late stage adult acquired flatfoot deformity. The role of deltoid ligament repair in these conditions has been limited and its contribution to arthritis is largely unknown. Neglect of the deltoid ligament in the treatment of ankle injuries may be due to difficulties in diagnosis and lack of an effective method for repair. Most acute repair techniques address the superficial deltoid ligament with direct end-to-end repair, fixation through bone tunnels, or suture anchor repair of avulsion injuries. Deep deltoid ligament repair has been described using direct end-to-end repair with sutures, as well as by autograft and allograft tendon reconstruction utilizing various techniques. Newer tenodesis techniques have been described for late reconstruction of both deep and superficial components in patients with stage 4 adult acquired flatfoot deformity. We describe a technique that provides anatomic ligament-to-bone repair of the superficial and deep bundles of the deltoid ligament while reducing the talus toward the medial malleolar facet of the tibiotalar joint with anchor-to-post reinforcement of the ligamentous repair. This technique may protect and allow the horizontally oriented fibers of the deep deltoid ligament to heal with the appropriate resting length while providing immediate stability of the construct. PMID:23576946

  4. The North Nuratau Fault Zone, Uzbekistan—Structure and evolution of a Palaeozoic Suture Zone

    NASA Astrophysics Data System (ADS)

    Nurtaev, B.; Kharin, V.; McCann, T.; Valdivia-Manchego, M.

    2013-03-01

    The Nuratau Fault Zone in eastern Uzbekistan forms part of the western prolongation of the Tien Shan, an extensive orogenic zone located along the margin of the Central Asian Orogenic Belt. The Nuratau region is geologically complex, forming part of the suture zone between the Kazakh-Kyrgyz continent and the Alai microcontinent. A model is proposed suggesting modified N-directed subduction model, where an extensive fold-and-thrust belt developed in the Nuratau region. This, coupled with significant transform activity would have resulted in major segmentation of the existing stratigraphy in the region, as well as the development of a foredeep basin to the north of the fold-and-thrust belt. Regional suturing and collision was variable. Indeed, the collisional history probably involved multi-phase subduction/accretion of various microcontinents, ancient island arcs, and fragments of oceanic islands. Final collision would have produced an eroding basinal high in the region of the Nuratau mountains, which issued sediment both northwards into the remnant basin of the Turkestan Ocean, but also to the south into the newly forming Amu Darya Basin.

  5. Comparison of thermal and optical techniques for describing light interaction with vascular grafts, sutures, and thrombus

    NASA Astrophysics Data System (ADS)

    Obremski, Susan M.; LaMuraglia, Glenn M.; Bruggemann, Ulrich H.; Anderson, R. Rox

    1991-06-01

    Pulsed photothermal radiometry (PPTR) and integrating sphere spectrophotometry analyzed by the theory of Kubelka and Munk (KM) were used to determine optical absorption coefficients of prosthetic grafts and sutures and arterial thrombus. The KM method, a purely optical theory and technique, resulted in higher absorption coefficients than those found using PPTR, a primarily thermal technique. This difference was statistically significant (t.025) for the prosthetic materials. With the KM method, other properties such as scattering can also be quantified and the experiment can be performed over a range of wavelengths at one time. The PPTR technique is limited to a single wavelength but it has the advantage that most materials can be tested without any special preparation. In addition, with PPTR the measured quantity is the temporal temperature response of an object to a laser pulse, which is itself of interest. Clinically, the high absorption coefficient of thrombus as compared to that of the graft and sutures (t.025 for the PPTR measurements) suggests that laser thrombectomy may be safe in polyethylene terephthalate (Dacron) grafts.

  6. Single incision laparoscopic TAPP with standard laparoscopic instruments and suturing of flaps: A continuing study

    PubMed Central

    Sinha, Rajeev; Malhotra, Vivek; Sikarwar, Prashant

    2015-01-01

    BACKGROUND: Single incision laparoscopic surgery, especially transumbilical, should be the closest to replicate the minimal access results achieved by natural orifice endoscopic surgery (NOTES). This study of single incision transabdominal preperitoneal (SITAPP) inguinal hernia repair is a continuing study exploring the peroperative variables and short and long term complications of this procedure. PATIENTS AND METHODS: All the 183 patients were operated by the same surgeon through a horizontal transumbilical incision positioned across the lower third of the umbilicus. Port access was through three separate transfacial punctures. Routine rigid instruments were used and the peritoneal flaps were either tacked or sutured into place. Patients with irreducible hernia and obstructed hernia were included, while those with strangulated hernia were excluded. RESULTS: All the patients were male with an average age of 41.4 years. Twenty four patients had bilateral hernia, 15 patients had irreducible and 6 patients had obstructed hernia. The mean operating time was 38.3 mins for unilateral hernias completed with tackers and 42.8 mins in those with intracorporeal suturing. The corresponding operating time for bilateral hernias was 53.2 and 62.7 minutes. There was minimal serous discharge from the umbilicus in 8 patients, port site infection in 1 patient and recurrence in 2 patients over a 36 months period. CONCLUSIONS: SITAPP for groin hernias, performed with conventional instruments is feasible, easy to learn, has a very high patient acceptance and is cosmetically superior to conventional TAPP. The use of tackers reduces the operating time significantly. PMID:25883454

  7. Suture-free laser-assisted vessel repair using CO2 laser and liquid albumin solder.

    PubMed

    Wolf-de Jonge, Ingrid C D Y M; Heger, Michal; van Marle, Jan; Balm, Ron; Beek, Johan F

    2008-01-01

    Numerous studies have shown that the use of proteinic solders during laser-assisted vascular anastomosis (LAVA) and repair (LAVR) can significantly increase welding strength, but these studies combined solder-mediated LAVA/R with the use of stay sutures, thereby defeating its purpose. In an in vitro study, we examined the leaking point pressures (LPPs) and histological damage profile of porcine carotid arteries following albumin solder-mediated CO(2) LAVR without the use of sutures. Longitudinal arteriotomies (9.1+/-0.8 mm in length) were sheathed with 25% liquid bovine serum albumin solder, and LAVR was performed using a micromanipulator-controlled CO(2) laser operating at 170-mW power and 1.25-mm spot size in continuous wave mode. The welding regime consisted of a transversal zigzag pass followed by one or two longitudinal zigzag passes, producing an irradiance of 13.9 W/cm(2) and energies of 10.5 J and 11.3 J per mm weld, respectively. LPPs were measured by the fluid infusion technique, and histological analysis was performed with light, fluorescence, and polarization microscopy. The LPP of the two-pass welds was 351+/-158 mmHg versus 538+/-155 mmHg for the three-pass welds. Thermal damage was confined primarily to the adventitial layers, with limited heat diffusion into the media below the solder around the coaptation interface. PMID:19021359

  8. The relationship between rabbit lens optical quality and sutural anatomy after vitrectomy.

    PubMed

    Kuszak, J R; Sivak, J G; Herbert, K L; Scheib, S; Garner, W; Graff, G

    2000-09-01

    This study was conducted first, to characterize structural changes in rabbit lenses after vitrectomy; and second, to assess whether such changes correlate with a quantifiable compromise in optical function. Unilateral, partial vitrectomies were performed on 2.5 month old Dutch Belted rabbits (n = 64). Age matched non-operated rabbits (n = 32) were used as controls. Lenses were analysed by correlative structural (light, scanning electron microscopic and three-dimensional computer-assisted drawings) and optical (low power helium-neon laser scan) analysis at 1.5, 3, 6 and 12 months post-surgery (n = 16 lenses from operated animals and n = 8 lenses from non-operated controls at each time point). Results demonstrate that in rabbits lens growth, or fiber formation, is compromised after vitrectomy. From 1.5 to 12 months after surgery, lenses had progressively more crooked posterior line sutures with sub-branches of increasing size and number in successive growth shells. Quantification of lens optical quality specifically along and/or between these atypical suture branches and sub-branches revealed a significant increase in focal length variability (sharpness of focus) after vitrectomy. A peripheral zone of fibers with abnormal posterior ends was produced surrounding the pre-surgical lens mass. This additional zone of aberrant fibers was associated with a quantifiable degradation in lens optics. Studies on the prevention of post-vitrectomy lens changes in this rabbit model may yield useful information applicable to the human condition. PMID:10973736

  9. Magnetotelluric evidence for crustal suture zones bounding the southern Great Valley, California

    SciTech Connect

    Park, S.K.; Biasi, G.P. (Univ. of California, Riverside (USA)); Mackie, R.L.; Madden T.R. (Massachusetts Inst. of Tech., Cambridge (USA))

    1991-01-10

    A geoelectric section inferred from a regional magnetotelluric study across the Coast Ranges, the Great Valley, and the Sierra Nevada reveals significant variations in electrical resistivity. Zones of lower resistivity interpreted at depths from 10 km to at least 30 km lie near mapped geologic boundaries between the Coast Ranges and the Great Valley and beneath the eastern side of the Great Valley. The former boundary is inferred by others to separate the subduction complex of the Coast Ranges from the mafic basement of the Great Valley. The lower resistivities are most likely associated with metasediments trapped between the Coast Ranges ophiolite and the former oceanic crust beneath the Great Valley. The latter boundary is problematic, but may be evidence for a deep metasedimentary section trapped between the ophiolites beneath the Great Valley and granitic rocks of the Sierra Nevada. The lack of change in the magnetotelluric phase across the Great Valley indicates that a suture zone marked by lower resistivities is unlikely to be present beneath the valley. However, this does not preclude the existence of a resistive suture zone.

  10. Use of a Barbed Suture Tie-Over Technique for Skin Graft Dressings: A Case Series

    PubMed Central

    Joyce, Cormac W; Mahon, Nicola; Kelly, Jack L

    2015-01-01

    Background A tie-over dressing is the accepted method to secure skin grafts in order to prevent haematoma or seroma formation. We describe the novel application of a barbed suture tie-over for skin graft dressing. The barbs act as anchors in the skin so constant tensioning of the suture is not required. Methods From January 2014 to August 2014 we used the technique in 30 patients with skin defects requiring split-thickness or full-thickness grafts. Patient demographics, clinicopathological details and graft outcome were collected prospectively. Results The majority of cases were carried out for split-thickness skin grafts (n=19) used on the lower limb (n=20). The results of this novel technique were excellent with complete (100%) graft take in all patients. Conclusions Our results demonstrate the clinical application of a barbed device for securing skin grafts with excellent results. We find the technique quick to perform and the barbed device easy to handle, which can be applied without the need for an assistant. PMID:26015891

  11. Narrowing of giant gastric perforation by purse-string suture before omental plugging

    PubMed Central

    Usta, Sertac; Kayaalp, Cuneyt; Gozeneli, Orhan

    2015-01-01

    Introduction Timely diagnosis of the gastroduodenal perforation usually allows primary repair or resection. Treatment of a large gastric perforation is more difficult than the common duodenal ulcer perforation by plugging and usually requires agastric resection. On the other hand, gastric resection fora hemodynamically compromised patient in sepsis hasa high rate of anastomotic failure and mortality. Here, we described a practical surgical technique that can avoid emergency gastric resection in such situations. Presentation of case A 83 year-old female admitted with peritonitis, severe sepsis and hemodynamic instability. After the diagnosis of hollow organ perforation and supportive therapy, laparotomy revealed a delayed and large (7 cm) gastric perforation. Instead of gastrectomy, we downsized the large defect by means of a purse-string suture around the perforation and made it suitable for the application of omental plugging. Discussion The patients with poor performance status who are not suitable for the gastric resection, a free omental plug fixation to the narrowed perforation area by a purse-string suture can overcome the problem. Conclusion This method can be keep in mind as a damage control surgery technique in the non-traumatic abdominal emergencies due to large gastric perforations. PMID:25984301

  12. Laypersons’ ratings of appearance in children with and without single suture craniosynostosis

    PubMed Central

    Collett, Brent R.; Gray, Kristen E.; Kapp-Simon, Kathleen A.; Birgfeld, Craig; Cunningham, Michael; Rudo-Stern, Jenna; Ung, Danielle; Buono, Lauren; Speltz, Matthew L.

    2013-01-01

    Background Single suture craniosynostosis (SSC) results in head shape anomalies that likely affect social perceptions of appearance. The purpose of this study was to evaluate laypersons’ ratings of attractiveness in children with and without SSC. Among cases, we also examined differences by suture fused and age at surgery. Methods We collected photographs of 196 children with SSC and 186 children without SSC as infants (prior to surgery, for cases) and at ages 18 and 36 months. Photographs were rated by 8 raters, who were blinded to the population being studied. We used linear regression to compare appearance ratings for the two groups at each visit and to evaluate changes over time. Regression analyses were used to examine the association between age at surgery and appearance ratings. Results Children with SSC received lower appearance ratings than unaffected controls at each visit (all p-values < .001). Appearance ratings decreased over time, with a similar trajectory for children with and without SSC. Among cases, those with unicoronal and lambdoid synostosis had the lowest ratings and those with sagittal synostosis had the highest. Age at surgery was inversely associated with appearance ratings. Conclusions Children with SSC received lower appearance ratings than unaffected controls, with minimal change following surgery. Better outcomes were associated with earlier surgery. These findings do not indicate that children with SSC failed to benefit from surgery, as without surgical intervention, asymmetrical head shape would likely have worsened over time. However, our data suggest that appearance does not fully ‘normalize’. PMID:23851801

  13. 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

  14. Permian–Triassic amalgamation of Asia: Insights from Northeast China sutures and their place in the final collision of North China and Siberia

    Microsoft Academic Search

    Wei Lin; Michel Faure; Sébastien Nomade; Qinghua Shang; Paul Randall Renne

    2008-01-01

    The Central Asia Orogenic Belt (CAOB) corresponds to the domain where Siberia and Mongolia were welded to North China. The eastern extension of the CAOB in Northeast China is disputed, since both suture location and timing are poorly documented. This paper reports for the first time the recognition of two suture zones in the southern part of Northeast China (Manchuria),

  15. 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

  16. Immunostimulatory sutures that treat local disease recurrence following primary tumor This article has been downloaded from IOPscience. Please scroll down to see the full text article.

    E-print Network

    Salem, Aliasger K.

    (CpG ODN) have been reported to induce potent anti-tumor immune responses. In this communication, we report on the development of a CpG ODN-loaded suture that can close up the wound following tumor excision and provide sustained localized delivery of CpG ODN to treat local disease recurrence. The suture was prepared

  17. Bone suture anchors versus the pullout button for repair of distal profundus tendon injuries: A comparison of strength in human cadaveric hands

    Microsoft Academic Search

    Marshall Brustein; James Pellegrini; Jack Choueka; Heather Heminger; Daniel Mass

    2001-01-01

    Avulsion or distal tendon laceration of flexor digitorum profundus (FDP) is classically repaired to the base of the distal phalanx via a pullout suture over a button. Bone suture anchors, used extensively in other surgical areas, have recently been proposed for reattachment of the FDP to the distal phalanx. The FDP tendons of the index, long, and ring fingers in

  18. Attenuation of external Bremsstrahlung in metallic absorbers

    SciTech Connect

    Dhaliwal, A.S.; Powar, M.S.; Singh, M. (Punjabi Univ., Physics Dept., Patiala 147002 (IN))

    1990-12-01

    In this paper attenuation of bremsstrahlung from {sup 147}Pm and {sup 170}Tm beta emitters has been studied in aluminum, copper, tin, and lead metallic absorbers. Bremsstrahlung spectra and mass attenuation coefficients for monoenergetic gamma rays are used to calculate theoretical attenuation curves. Magnetic deflection and beta stopping techniques are used to measure the integral bremsstrahlung intensities above 30 keV in different target thicknesses. Comparison of measured and calculated attenuation curves shows a good agreement for various absorbers, thus providing a test of this technique, which may be useful in understanding bremsstrahlung intensity buildup and in the design of optimum shielding for bremsstrahlung sources. It is found that the absorption of bremsstrahlung in metallic absorbers does not obey an exponential law and that absorbers act as energy filters.

  19. 21 CFR 872.6050 - Saliva absorber.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES DENTAL DEVICES Miscellaneous Devices § 872.6050 Saliva...intended to absorb moisture from the oral cavity during dental procedures. (b) Classification....

  20. 21 CFR 872.6050 - Saliva absorber.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ...DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES DENTAL DEVICES Miscellaneous Devices § 872.6050 Saliva...intended to absorb moisture from the oral cavity during dental procedures. (b) Classification....

  1. 21 CFR 872.6050 - Saliva absorber.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES DENTAL DEVICES Miscellaneous Devices § 872.6050 Saliva...intended to absorb moisture from the oral cavity during dental procedures. (b) Classification....

  2. 21 CFR 872.6050 - Saliva absorber.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES DENTAL DEVICES Miscellaneous Devices § 872.6050 Saliva...intended to absorb moisture from the oral cavity during dental procedures. (b) Classification....

  3. 21 CFR 872.6050 - Saliva absorber.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES DENTAL DEVICES Miscellaneous Devices § 872.6050 Saliva...intended to absorb moisture from the oral cavity during dental procedures. (b) Classification....

  4. A broadband planar THz metamaterial absorber

    NASA Astrophysics Data System (ADS)

    Xu, Zong-Cheng; Gao, Run-Mei; Ding, Chun-Feng; Zhang, Ya-Ting; Wu, Liang; Xu, De-Gang; Yao, Jian-Quan

    2015-05-01

    We propose the design of a broadband planar metamaterial absorber (MA) at terahertz frequencies. The unit cell of the MA is composed of four dual-band sub-cells with different dimensions in a coplanar. The four dual-band sub-cell structures resonate at several neighboring frequencies. The absorber consists of two metallic layers separated by a dielectric spacer. Simulation results show that the metamaterial absorption at normal incidence is above 90% in the frequency of 6.56-8.10 THz. This design provides an effective way to construct broadband absorber. The multiple-reflection theory was used to explain the absorption mechanism of our investigated structures. The coupling of adjacent four dual-band sub-cells can introduce additional capacitance to affect the performance of absorber.

  5. 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.

  6. Porous absorber for solar air heaters

    SciTech Connect

    Finch, J.A.

    1980-09-10

    A general discussion of the factors affecting solar collector performance is presented. Bench scale tests done to try to determine the heat transfer characteristics of various screen materials are explained. The design, performance, and evaluation of a crude collector with a simple screen stack absorber is treated. The more sophisticated absorber concept, and its first experimental approximation is examined. A short summary of future plans for the collector concept is included. (MHR)

  7. 21 CFR 886.3300 - Absorbable implant (scleral buckling method).

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...2010-04-01 2010-04-01 false Absorbable implant (scleral buckling method...Prosthetic Devices § 886.3300 Absorbable implant (scleral buckling method). (a) Identification. An absorbable implant (scleral buckling...

  8. 21 CFR 880.5300 - Medical absorbent fiber.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...2013-04-01 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...

  9. 21 CFR 880.5300 - Medical absorbent fiber.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...2012-04-01 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...

  10. 21 CFR 880.5300 - Medical absorbent fiber.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...2014-04-01 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...

  11. Absorbance changes of carotenoids in different solvents.

    PubMed

    Zang, L Y; Sommerburg, O; van Kuijk, F J

    1997-01-01

    Carotenoids are typically measured in tissues with the high performance liquid chromatography (HPLC) and quantitation is usually done by calibrating with stock solutions in solvents. Four carotenoids including lutein, zeaxanthin, lycopene and beta-carotene were dissolved in hexane and methanol respectively, and their absorbance characteristics were compared. Lutein shows absorbance spectra that are almost independent of solvents at various concentrations. Spectra of zeaxanthin, lycopene and beta-carotene were found to be more solvent-dependent. The absorbance of zeaxanthin at lambda max is about approximately 2 times larger in methanol than in hexane at the higher concentrations, and increased non-linearly with increasing concentration in hexane. The absorbance of lycopene at lambda max in hexane is approximately 4 fold larger than in methanol, but the absorbance of the methanol sample can be recovered by re-extracting this sample in hexane. The absorbance of beta-carotene in hexane is larger than in methanol, and increased linearly with increasing concentration. But beta-carotene showed a non-linear concentration effect in methanol. There are very small variations in lambda max for all four carotenoids between hexane and methanol, due to differences in molar extinction coefficients. The non-linear concentration effects for these carotenoids are probably due to differences in solubility leading to the formation of microcrystals. Thus, care should be taken with quantitation of tissue carotenoid values, when they depend on measurement of concentrations in stock solutions. PMID:9358253

  12. Tuned vibration absorbers for offshore structures

    SciTech Connect

    Dimentberg, M.F.; Hou, Z.; Noori, M.N.; Chen, S. [Worcester Polytechnic Inst., MA (United States). Dept. of Mechanical Engineering

    1996-12-31

    A preliminary feasibility study is made of efficiency of tuned vibration absorbers for reducing response of offshore platforms, to random ocean waves. The absorbers are submerged spring-loaded flaps, with stiffnesses of the springs being adjusted for tuning to any specific (rigid-body) mode of the platform (heaving, pitching, etc.), whereas actual design of the flaps should provide the desired amount of drag-induced damping. Mean square response analysis of the system is made for the case of a narrow-band random excitation due to ocean waves by using method of moments in conjunction with statistical linearization (with Gaussian closure) for quadratic damping term. Extensive parametric study is made of the efficiency of vibration control through the use of absorbers, as represented by the RMS response reduction factor. In particular, the efficiency increases with the absorber/platform mass ratio, and it may be of some practical importance even at values of this ratio as small as one percent. The importance of the excitation bandwidth is demonstrated. It is shown also, that whereas optimal damping of the absorber depends on the level of wave excitation, the RMS response reduction is fairly constant within a rather broad range of (nonlinear) damping, so that adjusting absorber damping for storm level may not be necessary.

  13. 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.

  14. Effects of two alar base suture techniques suture techniques on nasolabial changes after bimaxillary orthognathic surgery in Taiwanese patients with class III malocclusions.

    PubMed

    Chen, C Y-H; Lin, C C-H; Ko, E W-C

    2015-07-01

    A randomized controlled trial was designed to assess the effectiveness of two alar base cinch techniques on the changes in nasolabial morphology after bimaxillary orthognathic surgery. Sixty patients requiring a Le Fort I osteotomy to correct skeletal discrepancies were selected randomly to receive either conventional or modified alar base cinching during the intraoral wound closure procedure. Conventional cinching passed through nasalis muscle and anterior nasal spine. Modified cinching also passed through dermis tissue to increase the anchorage. Postoperative hard and soft tissue changes were evaluated using cone beam computed tomography and three-dimensional stereophotogrammetry at predefined time points. Forty-eight patients with a skeletal class III malocclusion were included. In the conventional group, there was an increase of 0.31±1.31mm in nasal width and an increase of 0.97±1.60mm in columellar length. In the modified group, there was an increase of 0.81±1.87mm in the cutaneous height of the upper lip and a decrease of 0.76±1.56mm in lower prolabial width. Patients with an initial narrow nasal width, alar base width, and less vertical nostril show were more susceptible to a greater degree of change after surgery. Both alar base suture techniques are effective at controlling nasolabial form changes resulting from class III dual-jaw orthognathic surgery. PMID:25825373

  15. In vivo absorbance spectra and the ecophysiology of reef macroalgae

    Microsoft Academic Search

    K. S. Beach; H. B. Borgeas; N. J. Nishimura; C. M. Smith

    1997-01-01

    .  ?In vivo absorbance spectra were obtained for 12 species of tropical macroalgae. Absorbance of UV irradiance was greater than\\u000a absorbance of photosynthetically active radiation in most algal taxa. UV irradiance may be pre-emptively captured by UV absorbing\\u000a compounds as indicated by the significant relationship between in vivo and extract absorbance characteristics. In vivo and\\u000a extract absorbance characteristics indicated that concentrations

  16. 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.

  17. Ophiolite suture in Central Anatolia: New insights from the Sivas Basin (Turkey)

    NASA Astrophysics Data System (ADS)

    Legeay, Etienne; Ringenbach, Jean-Claude; Mohn, Geoffroy; Kergaravat, Charlie; Callot, Jean-Paul

    2015-04-01

    The closure of the Neotethys is classically associated with the obduction of ophiolitic rocks, defining successive suture zones. Theses Alpine-Himalayan ophiolites reflect a complex and still poorly understood paleogeographic framework. In Turkey, various types of ophiolite have been described, involving supra subduction zone and ophiolitic melanges as well. Hence reconstructions of the Anatolian continent assumed the amalgamation of one or more continental fragments during the Mesozoic-Early Cenozoic time. The Sivas Basin is located in a key position at the junction of three crustal domains: the Pontides to the North, the Anatolide - Tauride platforms to the South, and the Central Anatolian Crystalline Complex to the West. These blocks are separated to the North by the Izmir-Ankara-Erzican suture zone (IAESZ), and by the Inner Tauride suture zone (ITSZ) to the South. Ophiolitic outcrops are common in this area, mainly on the basin borders, and sometimes within the central part. These green rocks have been previously related to the ophiolitic melange from the IAESZ in Northern part and to the ITSZ for the southern parts. Recent fieldwork on the southern edge of the Sivas Basin allows a proper description of the ophiolitic complex, including from bottom to top: (1) a large volume of intensely serpentinized peridotites, strongly veined with chrysotile, with minor gabbroic intrusions; (2) upward, serpentinized mantle rocks affected by a cataclastic deformation associated with tectonic breccias and ophicalcites ; and eventually, (3) on the top of the mantle, silicates deposits similar to radiolarian cherts cover by sedimentary breccias with mantle clasts. New geochemical analysis and subsurface data confirm the existence of a southward obducted slice of ophiolite over more than 100km from North to South, forming the basement of the Sivas Basin since the Campanian. This southward obduction related to the IAESZ appears similar to slow spreading ridge or hyper-extended domains derived ophiolites. We interpret the parent body as related to the exhumation of mantle rocks along low angle detachment faults either during the rifting or the oceanic accretion. The peridotites record a high serpentization degree, increasing toward the surface. Outcropping of the mantle rocks at the sea floor is responsible for the reworking of materials as tectonosedimentary breccias (ophicalcites). The emplacement of the gabbro will be constrained by U-Pb zircon geochronology.

  18. Evolution of the MongolOkhotsk Ocean as constrained by new palaeomagnetic data from the MongolOkhotsk suture zone,

    E-print Network

    Cogne, Jean-Pascal

    of the Mongol­Okhotsk suture we collected palaeomagnetic samples from the Late Permian Belektuy formation.5uE). We sampled the Late Permian Alentuy formation (Khilok region; 50.8uN, 107.2uE), the Early­Okhotsk Ocean palaeo- magnetically from the Late Permian to the Middle­Late Jurassic. They confirm

  19. Age of Detrital Zircons from Sandstones of the Mesozoic Flysch Formation in the South Anyui Suture Zone (Western Chukotka)

    Microsoft Academic Search

    G. E. Bondarenko; A. V. Soloviev; M. I. Tuchkova; J. I. Garver; I. I. Podgornyi

    2003-01-01

    The South Anyui fold zone (western Chukotka) is considered a suture zone related to closure of the South Anyui oceanic basin and collision of Eurasia with the Chukotka–Arctic Alaska microcontinent in the Early Cretaceous. The existence of a compensatory sedimentation basin (foredeep) during folding in the terminal Jurassic–initial Cretaceous remains debatable. This work presents first data on age estimates of

  20. In vivo molecular evaluation of guinea pig skin incisions healing after surgical suture and laser tissue welding using Raman spectroscopy.

    PubMed

    Alimova, A; Chakraverty, R; Muthukattil, R; Elder, S; Katz, A; Sriramoju, V; Lipper, Stanley; Alfano, R R

    2009-09-01

    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 (1247 cm(-1)) band to a peak at 1326 cm(-1) (the superposition of elastin and keratin bands) can be used to evaluate the progression of wound healing. Conformational changes in the amide I band (1633-1682 cm(-1)) and spectrum changes in the range of 1450-1520 cm(-1) were observed in LTW and sutured skin. The stages of the healing process of the guinea pig skin following LTW and suturing were evaluated by Raman spectroscopy, using histopathology 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. A wavelet decomposition-reconstruction baseline correction algorithm was employed to remove the fluorescence wing from the Raman spectra. PMID:19581109

  1. Late Palaeozoic radiolarians from the Bentong-Raub suture zone, and the Semanggol formation of Peninsular Malaysia—initial results

    Microsoft Academic Search

    Frances C. P Spiller; Ian Metcalfe

    1995-01-01

    Cherts and tuffaceous siltstones from the Bentong-Raub suture zone, Peninsular Malaysia, have yielded radiolarians indicating Late Devonian (Famennian) and Early Carboniferous (Tournaisian, late? Tournaisian and Viséan) ages. Cerium anomalies from these Devonian and Carboniferous cherts indicate deposition in an open ocean. This ocean is interpreted to be the Palaeo-Tethys ocean which existed between Sibumasu and East Malaya during at least

  2. 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

  3. Zygomaticomaxillary suture shape analyzed with digital morphometrics: reassessing patterns of variation in American Indian and European populations.

    PubMed

    Sholts, Sabrina B; Wärmländer, Sebastian K T S

    2012-04-10

    Typological classification of human zygomaticomaxillary suture (ZMS) shape is often used in forensic assessment of ancestry, following earlier studies reporting higher frequencies of "angled" sutures among American Indians and higher frequencies of "curved" sutures among Caucasians. In this paper we present a new method of digital morphometrics to quantify and compare ZMS shape in 60 American Indian and 60 European crania. Suture outlines were recorded as three-dimensional (3D) contours on digital models of adult male and female crania created with a portable 3D laser scanner. Each contour was represented by about four hundred point coordinates, which were transformed via Fourier analysis into amplitude coefficients suitable for use in linear discriminant analysis. Discriminant functions were created that accurately predicted group membership for 83% of the crania in the sample, after leave-one-out cross-validation. The results were compared with traditional typological classifications based on visual evaluation of ZMS shape, and the contour-based method was found to be more effective than the typological approach. However, the distribution of ZMS types within the two sample groups did not conform to previously reported patterns. This discrepancy indicates that ZMS shape may reflect not only genetic factors, but also environmental factors such as diet and stress. In addition, some evidence for sexual dimorphism in the zygomaticomaxillary complex was observed. Based on these findings, we recommend caution when using ZMS shape analysis in forensic ancestry determination. PMID:22154439

  4. Surface Strain on Bone and Sutures in a Monkey Facial Skeleton: An In Vitro Approach and its

    E-print Network

    sutures in the past two decades, especially the work on pigs in Herring's lab (Herring and Mucci, 1991; Herring, 1993; Rafferty and Herring, 1999; Herring and Rafferty, 2000; Herring and Teng, 2000; Rafferty et, 1983; Smith and Hylander, 1985; Herring and Mucci, 1991

  5. Long-term results of mitral valve repair for myxomatous disease with and without chordal replacement with expanded polytetrafluoroethylene sutures

    Microsoft Academic Search

    Tirone E. David; Ahmad Omran; Susan Armstrong; Zhao Sun; Joan Ivanov

    1998-01-01

    Objective: This study was carried out to evaluate the long-term results of mitral valve repair for mitral regurgitation caused by myxomatous disease of the mitral valve and the late effects of chordal replacement with expanded polytetrafluoroethylene sutures in this operation. Methods: A total of 324 patients with mitral regurgitation caused by myxomatous disease underwent mitral valve repair from 1981 to

  6. Bone morphogenetic protein is required for fibroblast growth factor 2-dependent later-stage osteoblastic differentiation in cranial suture cells

    PubMed Central

    Jiang, Taoran; Ge, Shengfang; Shim, Yoong Hoon; Zhang, Ce; Cao, Dejun

    2015-01-01

    Background: Understanding the pathophysiological process of calvarial bones development is important for the treatments on relative diseases such as craniosynostosis. While, the role of fibroblast growth factor (FGF) and bone morphogenetic protein (BMP) and how they interacted in osteoblast differentiation remain unclear. Methods: we digested bone fragments around the coronal and sagittal sutures from newborn rats to harvest suture cells. Markers expression at different osteoblast differentiation stage was analyzed by increasing FGF2 concentration and BMP2 blocking in these cells. Results: BMP2 expression could be stimulated by FGF2 in a dose and time dependent manner. FGF2 stimulation may decrease early marker of osteoblast differentiation (collagen type-1, COL-1) and increase the expression of continuously-expressed or late markers (alkaline phosphatase, ALP; osteocalcin, OC and bone sialoprotein, BSP) to accelerate mineralization. Inhibition of BMP2 signaling by Noggin weakens the effect of FGF2 on induction of later-stage osteoblastic differentiation of cranial suture cells. Conclusion: Our data suggest that BMP2 signaling is required for FGF2-dependent induction of later-stage of cranial suture cell osteoblastic differentiation.

  7. Suture restriction of the temporal bone as a risk factor for acute otitis media in children: cohort study

    PubMed Central

    2012-01-01

    Background Eustachian tube (ET) dysfunction plays an important role in the pathogenesis of acute otitis media (AOM). Unfortunately, there is a lack of knowledge about the exact role of the ET’s bony support, the temporal bone, on occurrence of AOM. This study investigates whether severe suture restriction of the temporal bone is a risk factor for development of AOM in young children. Methods Using a prospective cohort design, 64 children aged 6 to 18 months without prior history of AOM were followed during the cold season (September 2009 to April 2010). Temporal bone status (categorized as with or without severe suture restriction) was evaluated using palpation and a cranial bone mobility test. Information about potential baseline confounders and risk factors for AOM (gender, age, birth weight, gestational age, use of pacifier, daycare attendance, presence of siblings, low socioeconomic status, breastfeeding ? 6 months, parental smoking and history of upper respiratory tract infection) were also collected. Occurrence of AOM diagnosed by physicians blinded to temporal bone status was the main outcome. Data were analyzed using hierarchical linear and nonlinear (multilevel) models. Results Severe suture restriction of the temporal bone was identified in 23 children (35.9%). At least one AOM episode was diagnosed in 14 (48.3%) of the ears associated with temporal bones previously identified as having severe suture restriction and in 28 (28.3%) of those without severe suture restriction. Higher risk for AOM was explained by severe suture restriction of the temporal bone (adjusted relative risk (RR), 2.26, 95% CI 1.43 to 2.91, p<.01), pacifier use (RR, 2.59, 95% CI 1.51 to 3.22, p<.01) and younger age (RR, 0.22, 95% CI 0.10 to 0.52, p=.001). Conclusions The study results indicate that severe suture restriction of the temporal bone is a risk factor for AOM in young children. Subsequent intervention studies are needed to determine if this mechanical risk factor can be modified in young children. PMID:23167940

  8. Laparoscopic repair of perforated peptic ulcers: the sutured omental patch and focused sequential lavage technique.

    PubMed

    Siow, Sze Li; Mahendran, Hans Alexander

    2014-04-01

    We propose a standardized technique of repair and lavage with the outcomes of 50 consecutive patients treated at our institution. The perforation was closed primarily and reinforced with omental patch. It was then followed by peritoneal lavage in a focused sequential manner that involved quadrant to quadrant lavage with tilting of operating table and changing of position between the surgeon and the camera surgeon. None of our patients had postoperative intra-abdominal complications, but unfortunately 1 patient succumbed to respiratory complications. Respiratory complications was the most common postoperative complication in our series (9 patients), whereas 2 patients had ileus. There were no leaks or reoperations in our series. Laparoscopic repair and sutured omentoplasty, followed by focused sequential lavage in a systematic manner, if performed diligently, will yield good outcomes. PMID:24686348

  9. Arthroscopic assessment for patellar injuries and novel suture repair of patellar fracture in a cat.

    PubMed

    Cusack, Lara; Johnson, Matthew

    2013-01-01

    A 4 yr old spayed female domestic shorthair was evaluated for an acute, nonweight-bearing, left hind limb lameness. Following 2 wk of conservative management without clinical improvement, the patient was referred for further examination. The stifle was palpably enlarged with suspected periarticular fibrosis. Radiographs showed a lateral longitudinal patellar fracture as well as a medial patellar luxation. Arthroscopic examination of the stifle and repair of the patellar fracture and luxation were performed with an excellent clinical outcome. Nine weeks postoperatively, the owners reported that the cat was using the leg normally inside, and re-examination revealed no pain or crepitus with manipulation of the limb. To the authors' knowledge, this is the first reported use of arthroscopy as a diagnostic tool and of suture reduction for fracture repair in the management of feline patellar injury. PMID:23690486

  10. Cystoscopic removal of intravesical synthetic mesh extrusion with the aid of Endoloop sutures and endoscopic scissors.

    PubMed

    Bieniek, Jared M; Holste, Tara L; Platte, Raisa O; Minassian, Vatche A

    2012-08-01

    Synthetic mesh is commonly used in urogynecologic surgical procedures for correction of stress urinary incontinence and pelvic organ prolapse. Bladder mesh extrusion is a recognized complication and frequently requires extensive mesh resection. We present a case of intravesical polypropylene mesh extrusion following a combined mesh kit and midurethral sling placement. A novel transurethral approach, employing Endoloop sutures with endoscopic scissors, was used to resect the protruding mesh located in close proximity to a ureteral orifice. Medline was searched for other minimally invasive treatment strategies for bladder mesh extrusion. Various techniques for minimally invasive resection of extruded intravesical mesh have been described in the literature. Our strictly transurethral approach avoids the use of an energy source and eliminates the need for open or extensive surgery. Advantages of this new transurethral operative technique include decreased risk of injury associated with the use of an energy source within the bladder and avoidance of open surgical complications. PMID:22290194

  11. [Mechanical duodenal stump suture. Report of experiences: metal staples versus resorbable staples].

    PubMed

    Tonus, C; Böckmann, U; Nier, H

    1996-03-01

    The main observation criterion of the present retrospective study is the insufficiency rate after machine closing of the duodenal stump (TA-clip seam device, Auto-Suture), as a consequence of gastrectomy, resection of the stomach with Billroth II respective Roux-Y reconstruction, depending on the used type of clip. Between January 1, 1985 and October 2, 1989 the closing of the duodenal stump was routinely carried out with metal clips (n = 253) in the City Hospital Offenbach. Between October 3, 1989 and December 31, 1991 polysorb staples (n = 96) were exclusively used. The patient collectives were comparable regarding age, sex, health status, basic diseases, accompanying diseases and surgical methods. Closing of the duodenal stump by polysorb staples demonstrated with 13.5% more dehiscent seams than with metal clips (4.7%). As a result of the present study, we cannot recommend the use of polysorb clips for the closing of the duodenal stump. PMID:8681699

  12. A Review of the LARIAT Suture Delivery Device for Left Atrial Appendage Closure

    PubMed Central

    Safavi-Naeini, Payam; Razavi, Mehdi; Saeed, Mohammad; Rasekh, Abdi; Massumi, Ali

    2015-01-01

    The prevalence of atrial fibrillation (AF) is 1-2 % in the general population, and the risk of embolic stroke in AF patients is 4-5 times higher than that in the general population. AF-related strokes are often severe, and the rate of permanent disability is much higher among individuals who have AF-related strokes than in those who have strokes unrelated to AF. In patients with AF, more than 90 % of thrombi originate from the left atrial appendage (LAA). The purpose of this paper is to review the efficacy and safety of performing the LAA closure with the LARIAT Suture Delivery Device to prevent AF-related stroke in patients with contraindications to oral anticoagulant therapy.

  13. [Cranial asymmetries. Reflexions on plagiocephalies. Premature sutural synostosis or extracranial origin?].

    PubMed

    Czorny, A; Yettou, H; Forlodou, P; Ricbourg, B; Jacquet, G; Godard, J

    1994-01-01

    The authors relate a clinical and radiological (X Ray and TDM tridimensional) study with an anthropological (dry skulls) study of plagiocephaly. The aim is to find with the aid of a physical examination, some anatomic parameters which permit to differentiate cranial asymmetry with coronal premature synostotic suture from functional deformation with extracranial outset. The term plagiocephaly is used to define forehead asymmetry. It is necessary to study orbital rim, nasal root, malar eminence, ear and chin mid point position. The morphology of the skull is important to look: frontal flattering and also occipital flattering or bulging, contra-lateral frontal and pterional aera bulging. The authors conclude that a single parameter is necessary to differentiate the two kinds of plagiocephaly: the petrous bone position on the flattened frontal side: sagittalisation: fonctionnal plagiocephaly; frontalisation: synostotic plagiocephaly. PMID:7870251

  14. A Novel Surgical Pre-suturing Technique for the Management of Ankyloglossia

    PubMed Central

    Khairnar, Mayur; Pawar, Babita; Khairnar, Darshana

    2014-01-01

    Ankyloglossia or “tongue-tie” is a congenital anomaly caused by tight lingual frenulum that abnormally connects the tongue base to the floor of the mouth. Ankyloglossia can results in difficulty during speech and deglutition. This case series presents a novel surgical technique in the management of ankyloglossia in using presuturing technique in which different sets of sutures are given on lingual frenum before severing it. This results in reduced opening of the wound, minimal bleeding, pain and discomfort. Two male patients with severe ankyloglossia had been managed with this technique and after 2 years of follow-up of these cases showed satisfactory protrusive and lateral movement of the tongue with minimal scarring and discomfort. PMID:25598942

  15. X-raying the Intergalactic OVI Absorbers

    E-print Network

    Y. Yao; T. M. Tripp; Q. D. Wang; C. W. Danforth; C. R. Canizares; J. M. Shull; H. L. Marshall; L. Song

    2009-03-23

    The observed intergalactic OVI absorbers at z>0 have been regarded as a significant reservoir of the ``missing baryons''. However, to fully understand how these absorbers contribute to the baryon inventory, it is crucial to determine whether the systems are collisionally ionized or photoionized (or both). Using the identified intergalactic OVI absorbers as tracers, we search for the corresponding X-ray absorption lines, which are useful for finding the missing baryons and for revealing the nature of the OVI absorbers. Stacking the Chandra grating spectra along six AGN sight lines, we obtain three spectra with signal-to-noise ratios of 32, 28, and 10 per 12.5 mA spectral bin around the expected OVII Kalpha wavelength. These spectra correspond to OVI absorbers with various dynamic properties. We find no detectable NeIX, OVII, OVIII, NVII, or CVI absorption lines in the spectra, but the high counting statistics allows us to obtain firm upper limits on the corresponding ionic column densities (in particular N(OVII)<=10 N(OVI) on average at the 95% confidence level). Jointly analyzing these non-detected X-ray lines with the averaged OVI column density, we further limit the average temperature of the OVI-bearing gas to be log[T(K)]<=5.7 in collisional ionization equilibrium. We discuss the implications of these results for physical properties of the putative warm-hot intergalactic medium and its detection in future X-ray observations.

  16. Ultrathin flexible dual band terahertz absorber

    NASA Astrophysics Data System (ADS)

    Shan, Yan; Chen, Lin; Shi, Cheng; Cheng, Zhaoxiang; Zang, Xiaofei; Xu, Boqing; Zhu, Yiming

    2015-09-01

    We propose an ultrathin and flexible dual band absorber operated at terahertz frequencies based on metamaterial. The metamaterial structure consists of periodical split ring resonators with two asymmetric gaps and a metallic ground plane, separated by a thin-flexible dielectric spacer. Particularly, the dielectric spacer is a free-standing polyimide film with thickness of 25 ?m, resulting in highly flexible for our absorber and making it promising for non-planar applications such as micro-bolometers and stealth aircraft. Experimental results show that the absorber has two resonant absorption frequencies (0.41 THz and 0.75 THz) with absorption rates 92.2% and 97.4%, respectively. The resonances at the absorption frequencies come from normal dipole resonance and high-order dipole resonance which is inaccessible in the symmetrical structure. Multiple reflection interference theory is used to analyze the mechanism of the absorber and the results are in good agreement with simulated and experimental results. Furthermore, the absorption properties are studied under various spacer thicknesses. This kind of metamaterial absorber is insensitive to polarization, has high absorption rates (over 90%) with wide incident angles range from 0° to 45° and the absorption rates are also above 90% when wrapping it to a curved surface.

  17. The need in dural graft suturing in Chiari I malformation decompression: A prospective, single-blind, randomized trial comparing sutured and sutureless duraplasty materials

    PubMed Central

    Williams, Leena E.; Vannemreddy, Prasad S.; Watson, Karriem S.; Slavin, Konstantin V.

    2013-01-01

    Background: This study compared the use of two commonly utilized dural closure techniques used in augmentation duraplasty for Chiari malformation I (CM I) and evaluated their efficacy and outcome in terms of quality of life assessments. Methods: This prospective randomized study compared sutureless (DuraGen) and suturable (Dura-Guard) techniques in CM I decompression. Clinical parameters, cost analysis, and SF-36 Quality of Life Questionnaire (QLQ) were utilized to assess outcome. Results: Thirty-four patients were enrolled. Average age was 38.7 ± 12.2 years (mean ± SD (Standard Deviation)) and 82% of patients were female. Sixteen patients received DuraGen and 18 Dura-Guard. Age and gender were similar among groups. Postoperative complications did not differ between groups. Operative cost and time were less for DuraGen, whereas hospital stay was less with Dura-Guard, neither was statistically significant. Average QLQ scores at months 1, 2, and 3 improved in both groups. Dura-Guard patients showed greater improvement in quality of life at month 2 (P < 0.05) but groups did not differ at final survey. All patient's physical health (P < 0.005) and function (P < 0.005) were significantly improved. Outcome did not differ between groups and all patients showed significant improvement (P < 0.05). Conclusion: Both techniques are effective in reaching the goals of decompressive surgery for CM I and did not differ in quality of life at final survey. All patients showed significant improvement in physical function, physical health, and outcome following surgery. With all variables being equal the choice of duraplasty material may be based upon surgeon's preference. PMID:23532455

  18. Photoexited switchable metamaterial absorber at terahertz frequencies

    NASA Astrophysics Data System (ADS)

    Xu, Zongcheng; Gao, Runmei; Ding, Chunfeng; Wu, Liang; Zhang, Yating; Xu, Degang; Yao, Jianquan

    2015-06-01

    We propose a design and numerical study of an optically switchable metamaterial absorber in the terahertz regime. The metamaterial absorber comprises a periodic array of metallic split-ring resonators sitting back to back with an embedded semiconductor silicon. Filing the gap between the resonator arms with a semiconductor (silicon), leads to easy modification of its optical response through a pump beam which changes conductivity of Si. The conductivity of silicon is a function of incident pump power. Therefore, the resonance frequencies of the metamaterial can be tunable by applying an external pump power. The resonance peak of the absorption spectra shows a shift from 1.17 to 0.68 THz via external optical stimulus, with granting a resonance tuning range on the order of 42%. The optical-tuned absorber has potential applications as a terahertz modulator and switchable device and offer a step forward in filling the "THz gap".

  19. 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

  20. 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.

  1. Locking mechanism strength of absorbable ligating devices.

    PubMed

    Hay, D L; von Fraunhofer, J A; Chegini, N; Masterson, B J

    1988-03-01

    The locking mechanism strengths of the absorbable Absolok and Lactomer ligating clips and the absorbable Lactomer staple have been determined following implantation in an animal model. Three sizes of each type of clip and the single size of staple were enclosed in open mesh nylon pouches and implanted subcutaneously in rabbits for periods of 4, 7, 14, 21, and 28 days before tensile testing of the lock mechanisms. No change in the lock mechanism strength was detected for the Absolok clips before 21 days. The Lactomer clips and staples, however, showed significant decrease in lock mechanism strength within 7 days of implantation, this loss increasing with longer implantation times. A proportion of all the devices were found to have dissolved to an extent that precluded testing at 21 and 28 days. The findings indicate that the lock mechanisms of absorbable ligating clips differ significantly in their short-term (30 days) durability. PMID:3360813

  2. 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.

  3. Feasibility of Use of a Barbed Suture (V-Loc 180) for Quilting the Donor Site in Latissimus Dorsi Myocutaneous Flap Breast Reconstruction

    PubMed Central

    Hussain, Tasadooq; Mahapatra, Tapan Kumar; McManus, Penelope Louise; Kneeshaw, Peter John

    2013-01-01

    Background Latissimus dorsi (LD) myocutaneous flap is a popular method of breast reconstruction which can be associated with high incidence of seroma formation. Quilting sutures at the harvest site are used to reduce this. Barbed sutures are self anchoring sutures which avoid multiple knotting and can be useful in quilting. Methods A retrospective analysis of prospectively maintained database of patients who underwent LD flap breast reconstruction between January 2009 and January 2011 was carried out. Seroma formation at the harvest site, wound related complications, inpatient stay and duration of surgery were analysed and a comparison was made between two groups where quilting was done with barbed (V-Loc) suture and conventional polydioxanone (PDS) II sutures. Results Fifty-seven patients were included of which 33 had quilting by V-Loc sutures and in 24 patients PDS II suture was used. Median age in the PDS group was 55 years (interquartile range [IQR)], 45 to 61 years) which was comparable to the V-Loc group (53 years [IQR, 48 to 59 years]; P-value 0.948). Sixteen patients (28%) had significant seroma formation and 5 (9%) patients developed superficial wound dehiscence. Incidences of seroma or wound complications were comparable (P-value 0.378 and 1.00, respectively). Secondary outcomes such as total duration of surgery, total inpatient stay, total amount of drain at the donor site were also similar in two groups. Conclusions Use of barbed sutures for quilting the donor site in LD flap reconstruction is a feasible option and the associated seroma formation and wound complications are comparable with conventional sutures. PMID:23532830

  4. Design aspects of vertical wave absorbers

    SciTech Connect

    Clauss, G.F.; Kuhlmann, G.H. [Technical Univ. of Berlin (Germany). Inst. of Naval Architecture and Ocean Engineering

    1995-12-31

    This paper presents a new numerical procedure for the analysis of multi-row wave absorbers with selected porosities of individual elements. The theoretical model is based on the calculation of the energy flux, i.e. the analysis of transmission, reflection and the energy dissipation at successive rows using the impulse response function. Empirical coefficients obtained from experiments with single screens are used in the numerical treatment of absorbers consisting of an array of screens. The analysis is backed up by an experimental program which investigates the reflection and transmission characteristics of porous walls in encountering wave groups as well as in transient wave trains representing a design wave spectrum.

  5. SELECTIVE ABSORBER COATED FOILS FOR SOLAR COLLECTORS

    SciTech Connect

    Lampert, Carl M.

    1980-04-01

    Solar absorber metal foils are discussed in terms of materials and basic processing science. Also included is the use of finished heavy sheet stock for direct fabrication of solar collector panels. Both the adhesives and bonding methods for foils and sheet are surveyed. Developmental and representative commercial foils are used as illustrative examples. As a result it was found that foils can compete economically with batch plating but are limited by adhesive temperature stability. Also absorber foils are very versatile and direct collector fabrication from heavy foils appears very promising.

  6. Advection diffusion equation with absorbing boundary

    E-print Network

    John Grant; Michael Wilkinson

    2014-12-15

    We consider a spatially homogeneous advection-diffusion equation in which the diffusion tensor and drift velocity are time-independent, but otherwise general. We derive asymptotic expressions, valid at large distances from a steady point source, for the flux onto a completely permeable boundary and onto an absorbing boundary. The absorbing case is treated by making a source of antiparticles at the boundary. In both cases there is an exponential decay as the distance from the source increases; we find that the exponent is the same for both boundary conditions.

  7. OSCEE fan exhaust bulk absorber treatment evaluation

    NASA Technical Reports Server (NTRS)

    Bloomer, H. E.; Samanich, N. E.

    1980-01-01

    The acoustic suppression capability of bulk absorber material designed for use in the fan exhaust duct walls of the quiet clean short haul experiment engine (OCSEE UTW) was evaluated. The acoustic suppression to the original design for the engine fan duct which consisted of phased single degree-of-freedom wall treatment was tested with a splitter and also with the splitter removed. Peak suppression was about as predicted with the bulk absorber configuration, however, the broadband characteristics were not attained. Post test inspection revealed surface oil contamination on the bulk material which could have caused the loss in bandwidth suppression.

  8. Method for manufacture of neutron absorbing articles

    SciTech Connect

    Owens, D.

    1980-07-22

    A one-step curing method for the manufacture of a neutron absorbing article which comprises irreversibly curing, in desired article form, a form-retaining mixture of boron carbide particles, curable phenolic resin in solid state and in particula te form and a minor proportion of a liquid medium, which boils at a temperature below 200*c., at an elevated temperature so as to obtain bonding of the irreversibly cured phenolic polymer resulting to the boron carbide particles and production of the neutron absorbing article in desired form.

  9. The MIRD method of estimating absorbed dose

    SciTech Connect

    Weber, D.A.

    1991-01-01

    The estimate of absorbed radiation dose from internal emitters provides the information required to assess the radiation risk associated with the administration of radiopharmaceuticals for medical applications. The MIRD (Medical Internal Radiation Dose) system of dose calculation provides a systematic approach to combining the biologic distribution data and clearance data of radiopharmaceuticals and the physical properties of radionuclides to obtain dose estimates. This tutorial presents a review of the MIRD schema, the derivation of the equations used to calculate absorbed dose, and shows how the MIRD schema can be applied to estimate dose from radiopharmaceuticals used in nuclear medicine.

  10. CONTROLLABLE ABSORBING STRUCTURE OF METAMATERIAL AT MICROWAVE

    Microsoft Academic Search

    Zhanxian Xu; Weigan Lin; Lidu Kong

    2007-01-01

    Akind of controllable metamaterial absorbing structure is presented in this paper, both transmission coefficient and single radar cross section (RCS) are electrically controlled. This structure is composed from split ring resonators (SRRs) and metallic wire arrays including pin diodes, pin diodes are periodically inserted at these wire arrays discontinuous, and they can be either in an on state or in

  11. The design of broadband radar absorbing surfaces

    NASA Astrophysics Data System (ADS)

    Suk, Go H.

    1990-09-01

    There has been a growing and widespread interest in radar absorbing material technology. As the name implies, radar absorbing materials or RAM's are coatings whose electric and magnetic properties have been selected to allow the absorption of microwave energy at discrete or broadband frequencies. In military applications low radar cross section (RCS) of a vehicle may be required in order to escape detection while a covert mission is being carried on. These requirements have led to the very low observable or stealth technology that reduces the probability of detection of an aircraft. The design of radar absorbing materials is limited by constraints on the allowable volume and weight of the surface coating, and it is difficult to design a broadband radar absorbing structure in limited volume. This thesis investigates the use of lossy dielectric materials of high dielectric permittivity in multilayer composites for the production of low radar cross section (RCS). The analysis is done by computing the plane wave reflection coefficient at the exterior surface of the composite coating by means of a computer program which selects layer parameters which determine low reflection coefficients for electromagnetic radiation under constraint of limited layer thickness as well as maximum frequency bandwidth.

  12. Shock absorber protects motive components against overloads

    NASA Technical Reports Server (NTRS)

    1965-01-01

    Shock absorber with an output shaft, hollow gear, and a pair of springs forming a resilient driving connection between shaft and gear, operates when abnormally high torques are applied. This simple durable frictional device is valuable in rotating mechanisms subject to sudden overloads.

  13. Shock absorbing mount for electrical components

    NASA Technical Reports Server (NTRS)

    Dillon, R. F., Jr.; Mayne, R. C. (inventors)

    1975-01-01

    A shock mount for installing electrical components on circuit boards is described. The shock absorber is made of viscoelastic material which interconnects the electrical components. With this system, shocks imposed on one component of the circuit are not transmitted to other components. A diagram of a typical circuit is provided.

  14. Equivalence and optimization of absorbing boundary conditions

    Microsoft Academic Search

    Weiliang Yuan; Qinxi Chu; Changhong Liang

    1998-01-01

    Four types of absorbing boundary conditions (ABC) widely used in finite-difference time-domain (FDTD) simulations are discussed from the point of view of their equivalence. They include Mur's (1981) ABC, dispersive ABC, Liao's (1986) ABC and Higdon's (1986) operator, and an analytical expression of Liao's ABC is given. These ABCs are essentially equivalent and can be embodied by an analytical equation

  15. An analysis of Liao's absorbing boundary condition

    Microsoft Academic Search

    R. L. Wagner; W. C. Chew

    1995-01-01

    A theoretical and numerical analysis of Liao's absorbing boundary condition (ABC) is presented. The form of the ABC is related to both space-time polynomial extrapolation and a one-way wave equation. A modification allowing the optimization of the ABC for specific angles of incidence or wave speeds is discussed. The stability of the ABC is also discussed, and a technique is

  16. Oxygen Absorbers for Extension of Crackers Shelflife

    Microsoft Academic Search

    Sigalit Berenzon; I. Sam Saguy

    1998-01-01

    Applicability of oxygen absorbers for extending shelf-life of military ration crackers packaged in hermetically sealed tin cans and stored at 15, 25 and 35 °C for up to 52 weeks was assessed. Lipid oxidation began immediately after baking. Storage temperature was the major factor affecting the rate of oxygen depletion within the can. Residual headspace oxygen of the crackers stored

  17. Optimization and engineering of microwave absorbers

    Microsoft Academic Search

    Kuo-Liang Chen

    1998-01-01

    In this thesis, a concerted effort has been made to study and evaluate the individual electromagnetic properties of the absorbing components including carbon black, conducting fibers, metal flakes, magnetic materials such as carbonyl iron, ferrite and the chiral type of micro- carbon coil. The study of the electromagnetic properties covers functions such as dielectric dissipation, random scattering effect at low

  18. Aldehyde-containing urea-absorbing polysaccharides

    NASA Technical Reports Server (NTRS)

    Mueller, W. A.; Hsu, G. C.; Marsh, H. E., Jr. (inventors)

    1977-01-01

    A novel aldehyde containing polymer (ACP) is prepared by reaction of a polysaccharide with periodate to introduce aldehyde groups onto the C2 - C3 carbon atoms. By introduction of ether and ester groups onto the pendant primary hydroxyl solubility characteristics are modified. The ACP is utilized to absorb nitrogen bases such as urea in vitro or in vivo.

  19. Front End Chicane Chicane Geometry and Absorber

    E-print Network

    McDonald, Kirk

    National Laboratory MAP Front End Meeting 6 May 2014 #12;Introduction Mu onAccelera tor Program GoalMu onAccelera tor Program Front End Chicane Chicane Geometry and Absorber J. Scott Berg Brookhaven 2014 J. S. Berg | Chicane | MAP Front End (2) #12;Previous Status (1 April) Mu onAccelera tor Program

  20. On Delayed Choice and Contingent Absorber Experiments

    E-print Network

    R. E. Kastner

    2012-05-15

    It is pointed out that a slight variation on the Wheeler Delayed Choice Experiment presents the same challenge to orthodox quantum mechanics as Maudlin-type contingent absorber experiments present to the Transactional Interpretation (TI). Therefore, the latter cannot be used as a basis for refutation of TI.

  1. Approximating Resonances with the Complex Absorbing Potential ...

    E-print Network

    2005-10-25

    the fact that perturbation spectral theory for non-self-adjoint operators is a delicate ...... 1 + ir. = ?i r + e. ?i. 1 + ir 3. (52). Choose r = exp? r ? B. ?k for 0 ? r ? 1/C, .... variable representation — absorbing boundary condition Green's function.

  2. Light-absorbing impurities in Arctic snow

    Microsoft Academic Search

    S. J. Doherty; S. G. Warren; T. C. Grenfell; A. D. Clarke; R. E. Brandt

    2010-01-01

    Absorption of radiation by ice is extremely weak at visible and near-ultraviolet wavelengths, so small amounts of light-absorbing impurities in snow can dominate the ab- sorption of solar radiation at these wavelengths, reducing the albedo relative to that of pure snow, contributing to the surface energy budget and leading to earlier snowmelt. In this study Arctic snow is surveyed for

  3. Light-absorbing impurities in Arctic snow

    Microsoft Academic Search

    S. J. Doherty; S. G. Warren; T. C. Grenfell; A. D. Clarke; R. E. Brandt

    2010-01-01

    Absorption of radiation by ice is extremely weak at visible and near-ultraviolet wavelengths, so small amounts of light-absorbing impurities in snow can dominate the absorption of solar radiation at these wavelengths, reducing the albedo relative to that of pure snow, contributing to the surface energy budget and leading to earlier snowmelt. In this study Arctic snow is surveyed for its

  4. Neutron absorbers and methods of forming at least a portion of a neutron absorber

    DOEpatents

    Guillen, Donna P; Porter, Douglas L; Swank, W David; Erickson, Arnold W

    2014-12-02

    Methods of forming at least a portion of a neutron absorber include combining a first material and a second material to form a compound, reducing the compound into a plurality of particles, mixing the plurality of particles with a third material, and pressing the mixture of the plurality of particles and the third material. One or more components of neutron absorbers may be formed by such methods. Neutron absorbers may include a composite material including an intermetallic compound comprising hafnium aluminide and a matrix material comprising pure aluminum.

  5. Absorbed fractions for electrons in ellipsoidal volumes

    NASA Astrophysics Data System (ADS)

    Amato, E.; Lizio, D.; Baldari, S.

    2011-01-01

    We applied a Monte Carlo simulation in Geant4 in order to calculate the absorbed fractions for monoenergetic electrons in the energy interval between 10 keV and 2 MeV, uniformly distributed in ellipsoids made from soft tissue. For each volume, we simulated a spherical shape, four oblate and four prolate ellipsoids, and one scalene shape. For each energy and for every geometrical configuration, an analytical relationship between the absorbed fraction and a 'generalized radius' was found, and the dependence of the fit parameters from electron energy is discussed and fitted by proper parametric functions. With the proposed formulation, the absorbed fraction for electrons in the 10-2000 keV energy range can be calculated for all volumes and for every ellipsoidal shape of practical interest. This method can be directly applied to evaluation of the absorbed fraction from the radionuclide emission of monoenergetic electrons, such as Auger or conversion electrons. The average deposited energy per disintegration in the case of extended beta spectra can be evaluated through integration. Two examples of application to a pure beta emitter such as 90Y and to 131I, whose emission include monoenergetic and beta electrons plus gamma photons, are presented. This approach represent a generalization of our previous studies, allowing a comprehensive treatment of absorbed fractions from electron and photon sources uniformly distributed in ellipsoidal volumes of any ellipticity and volume, in the whole range of practical interest for internal dosimetry in nuclear medicine applications, as well as in radiological protection estimations of doses from an internal contamination.

  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. History of India-Asia Suturing in Tibet: Constraints and Questions

    NASA Astrophysics Data System (ADS)

    Kapp, P. A.; Ding, L.

    2011-12-01

    The India-Asia collision zone is widely pointed to as the type Cenozoic example of continental suturing and collision, yet there remains considerable controversy about its geological and geodynamical evolution. This in part may reflect the richness and complexity of the geological records exposed across the collision zone and how much remains to be extracted from them. Separating the formerly Andean-style continental margin of southern Asia (Gangdese arc and forearc of the Lhasa terrane) in the north, from Indian-affinity strata deformed in the Tethyan Himalayan thrust belt to the south, is the Indus-Yarlung suture zone (IYSZ). In Tibet, ophiolitic rocks along the IYSZ crystallized and were obducted in a suprasubduction zone setting during Early Cretaceous time. The ophiolitic rocks are of the appropriate age to have formed the basement upon which Gangdese forearc strata accumulated. Alternatively, they may represent remnants of an intra-oceanic subduction system that persisted in the Tethys, far from Asia, until Greater India collided with it during the latest Cretaceous to Paleocene. There has been no documentation, however, of ophiolitic or arc fragments younger than Early Cretaceous within the IYSZ. Distinguishing between these two end-member scenarios is important for interpreting detrital records of orogenesis and seismic tomographic images of the mantle. A preponderance of evidence suggests that collision between the Tethyan Himalaya and Asia initiated by 52 Ma. Initial collision led abruptly to profound and far-field changes in paleogeography and tectonism such that by 45 Ma, major shortening and potassic volcanism was ongoing in northern Tibet, plateau-like conditions were established in central Tibet, Tethyan Himalayan crust was undergoing anatexis, and Eo-Himalayan prograde metamorphism was underway. Additional constraints on the shortening history of the Tethyan Himalayan thrust belt will be key to assessing when and how much Greater Indian lithosphere was subducted northward beneath Asia during the Paleogene. Large-scale northward underthrusting of Greater Indian lithosphere (>600 km between 45 and 30 Ma), its subsequent rapid rollback to the south of the IYSZ (30 - 20 Ma), and renewed northward underthrusting (15 Ma to Recent), is inferred from north-south temporal sweeps in Cenozoic magmatism in Tibet. This history of Greater Indian lithosphere subduction may help explain major transitions in the kinematic evolution of the Himalayan-Tibetan orogen and can account for more than half of the total convergence between India and Asia since 50 Ma.

  8. A Tale of Amalgamation of Three Permo-Triassic Collage Systems in Central Asia: Oroclines, Sutures, and Terminal Accretion

    NASA Astrophysics Data System (ADS)

    Xiao, Wenjiao; Windley, Brian F.; Sun, Shu; Li, Jiliang; Huang, Baochun; Han, Chunming; Yuan, Chao; Sun, Min; Chen, Hanlin

    2015-05-01

    The Central Asian Orogenic Belt records the accretion and convergence of three collage systems that were finally rotated into two major oroclines. The Mongolia collage system was a long, N-S-oriented composite ribbon that was rotated to its current orientation when the Mongol-Okhotsk orocline was formed. The components of the Kazakhstan collage system were welded together into a long, single composite arc that was bent to form the Kazakhstan orocline. The cratons of Tarim and North China were united and sutured by the Beishan orogen, which terminated with formation of the Solonker suture in northern China. All components of the three collage systems were generated by the Neoproterozoic and were amalgamated in the Permo-Triassic. The Central Asian Orogenic Belt evolved by multiple convergence and accretion of many orogenic components during multiple phases of amalgamation, followed by two phases of orocline rotation.

  9. Comparison of genome-wide gene expression in suture- and alkali burn-induced murine corneal neovascularization

    PubMed Central

    Jia, Changkai; Zhu, Wei; Ren, Shengwei; Xi, Haijie; Li, Siyuan

    2011-01-01

    Purpose Suture placement and alkali burn to the cornea are often used to induce inflammatory corneal neovascularization (CorNV) models in animals. This study compares the changes in genome-wide gene expression under these two CorNV conditions in mice. Methods CorNV were induced in Balb/c mice by three interrupted 10–0 sutures placed at sites about 1 mm from the corneal apex, or by alkali burns that were 2 mm in size in the central area of the cornea. At the points in time when neovascularization progressed most quickly, some eyeballs were subjected to histological staining to examine CorNV and inflammatory cells infiltration, and some corneas were harvested to extract mRNA for microarray assay. After normalization and filtering, the microarray data were subject to statistical analysis using Significance Analysis of Microarray software, and interested genes were annotated using the Database for Annotation, Visualization, and Integrated Discovery (DAVID) program. The expression change of classical proangiogenic molecule like vascular endothelial growth factor (VEGF) and antiangiogenic molecule like pigment epithelium-derived factor (PEDF) was further verified using western blotting. Results Suture placement induced CorNV in the areas between the suture and limbus, but did not affect the transparency of the yet unvasuclarized areas of the corneas. In contrast, alkali burn caused edema and total loss of transparency of the whole cornea. Histology showed that sutures only caused localized epithelial loss and inflammatory infiltration between the suture and limbus, but chemical burn depleted the whole epithelial layer of the central cornea and caused heavy cellular infiltration of the whole cornea. At day 5 after suture placement, 1,055 differentially expressed probes were identified, out of which 586 probes were upregulated and 469 probes were downregulated. At a comparable time point, namely on day 6 after the alkali burn to the corneas, 472 probes were upregulated and 389 probes were downregulated. Among these differentially expressed probes, a significant portion (530 probes in total, including 286 upregulated and 244 downregulated probes) showed a similar pattern of change in both models. Annotation (using DAVID) of the overlapping differential genes revealed that the significant enrichment gene ontology terms were “chemotaxis” and “immune response” for the upregulated genes, and “oxidation reduction” and “programmed cell death” for the downregulated genes. Some genes or gene families (e.g., S100A family or ?-, ?-, or ?-crystallin family) that had not been related to corneal pathogenesis or neovascularization were also revealed to be involved in CorNV. VEGF was upregulated and PEDF was stable as shown with western blotting. Conclusions Sutures and alkali burn to the corneas produced types of damage that affected transparency differentially, but gene profiling revealed similar patterns of changes in gene expression in these two CorNV models. Further studies of the primary genes found to be involved in CorNV will supplement current understanding about the pathogenesis of neovascularization diseases. PMID:21921991

  10. Absorbing properties and structural design of microwave absorbers based on carbonyl iron and barium ferrite

    Microsoft Academic Search

    Y. B. Feng; T. Qiu; C. Y. Shen

    2007-01-01

    Carbonyl iron and barium ferrite powder (BaZn1.5Co0.5Fe16O27) were prepared in this work. The complex permittivity and permeability spectra for rubber radar absorbing materials employing carbonyl iron and barium ferrite powders were measured. A database describing the frequency dependence of the permittivities and permeabilities of the carbonyl iron and barium ferrite microwave absorbers with various powder percentage compositions in 2–18GHz was

  11. Absorbing properties and structural design of microwave absorbers based on carbonyl iron and barium ferrite

    Microsoft Academic Search

    Y. B. Feng; T. Qiu; C. Y. Shen

    2007-01-01

    Carbonyl iron and barium ferrite powder (BaZn1.5Co0.5Fe16O27) were prepared in this work. The complex permittivity and permeability spectra for rubber radar absorbing materials employing carbonyl iron and barium ferrite powders were measured. A database describing the frequency dependence of the permittivities and permeabilities of the carbonyl iron and barium ferrite microwave absorbers with various powder percentage compositions in 2 18

  12. 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

    LAMELLAR CORNEAL TRANSPLANTATION: COMPARISON OF A SIMPLIFIED TECHNIQUE UTILIZING A CONTACT LENS SPLINT SUPPORTED BY TISSUE ADHESIVES WITH A STANDARD SUTURE GRAFT PROCEDURE A Thesis by ROBERT FRANKLIN PLAYTER Submitted to the Graduate College... LENS SPLINT SUPPORTED BY TISSUE ADHESIVES WITH A STANDARD SUTURE GRAFT PROCEDURE A Thesis by ROBERT FRANKLIN PLAYTER Approved as to style and content by: (Chairman of Committee) ( ea of Depart ent (Member) (Member) May 1974 ABSTRACT Lamellar...

  13. The impact of bone and suture material properties on mandibular function in Alligator mississippiensis: testing theoretical phenotypes with finite element analysis

    PubMed Central

    Reed, David A; Porro, Laura B; Iriarte-Diaz, Jose; Lemberg, Justin B; Holliday, Casey M; Anapol, Fred; Ross, Callum F

    2011-01-01

    Abstract The functional effects of bone and suture stiffness were considered here using finite element models representing three different theoretical phenotypes of an Alligator mississippiensis mandible. The models were loaded using force estimates derived from muscle architecture in dissected specimens, constrained at the 18th and 19th teeth in the upper jaw and 19th tooth of the lower jaw, as well as at the quadrate-articular joint. Stiffness was varied systematically in each theoretical phenotype. The three theoretical phenotypes included: (i) linear elastic isotropic bone of varying stiffness and no sutures; (ii) linear elastic orthotropic bone of varying stiffness with no sutures; and (iii) linear elastic isotropic bone of a constant stiffness with varying suture stiffness. Variation in the isotropic material properties of bone primarily resulted in changes in the magnitude of principal strain. By comparison, variation in the orthotropic material properties of bone and isotropic material properties of sutures resulted in: a greater number of bricks becoming either more compressive or more tensile, changing between being either dominantly compressive or tensile, and having larger changes in the orientation of maximum principal strain. These data indicate that variation in these model properties resulted in changes to the strain regime of the model, highlighting the importance of using biologically verified material properties when modeling vertebrate bones. When bones were compared within each set, the response of each to changing material properties varied. In two of the 12 bones in the mandible, varied material properties within sutures resulted in a decrease in the magnitude of principal strain in bricks adjacent to the bone/suture interface and decreases in stored elastic energy. The varied response of the mandibular bones to changes in suture stiffness highlights the importance of defining the appropriate functional unit when addressing relationships of performance and morphology. PMID:21091693

  14. 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

  15. Tectonic environment and geodynamic significance of the Neo-Cimmerian Donqiao ophiolite, Bangong-Nujiang suture zone, Tibet

    Microsoft Academic Search

    J. Girardeau; J. Marcoux; C. J. Allègre; J. P. Bassoullet; Tang Youking; Xiao Xuchang; Zao Yougong; Wang Xibin

    1984-01-01

    The Bangong-Nujiang suture zone is underlain by a discontinuous and roughly EW ophiolite belt. Around Donqiao-Gyanco, ophiolitic and metasedimentary Palaeozoic series form nappes thrusted over Jurassic flysch series. All these series have undergone a late symmetrical folding accompanied by generally northward reverse faulting. Although strongly dismembered, a complete ophiolitic sequence comprising harzburgites with large podiform-type chromite deposits, wehrlites, cumulate gabbros,

  16. 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.

  17. A novel suture technique for distal aorta-graft anastomosis in aortic aneurysm repair surgery: diagonal basting stitch.

    PubMed

    Cagli, Kerim; Cicek, Omer Faruk; Lafci, Gokhan

    2015-05-01

    We describe a novel suture technique of distal anastomosis between the graft and the aorta in ascending aortic aneurysm repair surgery. In this technique, the aortic graft is positioned inside the distal aortic lumen with an overlapping segment and circumferential or back wall part only diagonal basting stitches are performed without use of Teflon pledgets, strips, or bioadhesives. This new technique establishes a secure anastomosis line, shortens anastomosis time, and avoids the use of foreign materials. PMID:25733219

  18. Double-loop locking cross-stitch suture and suspension fixation for medial collateral ligament origin reconstruction.

    PubMed

    Li, C J; Wang, B C; Liu, D Q

    2014-01-01

    The purpose of this study was to summarize the clinical application and results of the double-loop locking cross-stitch suture and suspension fixation method for medial collateral ligament origin reconstruction. Thirty-six patients (21 males, 15 females) with an average age of 40 years (range = 17-58 years), who underwent treatment for acute fracture of the medial collateral ligament at our hospital from February 2008 to May 2009, were included in this study. All patients presented unilateral injuries (17 right-sided, 19 left-sided) and underwent repair with the double-loop locking cross-stitch suture and suspension fixation method. All incisions in this group of patients healed by first intention. Thirty-two patients were followed up for 6-20 months (average = 12 months). There were no reports of wound infection, ligament re-fracture or other complications in the follow-up period. Based on the Lysholm knee-scoring scale, the patients received a 100% excellent and good rating (20 patients - excellent score, 12 patients - good score) postoperatively. The advantages of the double-loop locking cross-stitch suture and suspension fixation method are a smaller incision, reliable fixation, and early restoration of knee joint stability. It is, therefore, an effective and low-risk method for the reconstruction of medial collateral ligament origin. PMID:25078597

  19. 3-d structure of the Late Paleozoic suture beneath the Georgia coastal plain: evidence from new COCORP profiling

    SciTech Connect

    Arnow, J.A.; Nelson, K.D.; McBride, J.H.; Wille, D.M.; Oliver, J.E.; Brown, L.D.; Kaufman, S.

    1985-01-01

    New COCORP data collected on the Georgia coastal plain reveal a broad internally complex zone of basement reflections associated with the Brunswick magnetic low. This feature probably marks the late Paleozoic suture between North American and Africa. Multiple crossings of this feature provide information on its three-dimensional structure as well as its regional trend. The presumed suture consists of prominent bands of both arcuate and planar south-dipping reflections that extend from near the surface to the base of the crust (5-35 km), along with discrete apparently crosscutting northeast-dipping reflections. The dipping reflections in the deep crust extend downward to subhorizontal Moho reflections but do not penetrate through these reflections or offset them, suggesting that Moho is younger than the dipping fabric within the crust. In western Georgia the south-dipping reflections project upward toward metamorphosed and thrust-imbricated eugeoclinal strata exposed in the southernmost Piedmont, suggesting that they represent the downdip extension of that assemblage. The northeast-dipping reflections might represent south-vergent Paleozoic thrusts, Mesozoic normal faults, or both. In western Georgia the suture zone is relatively narrow (about 70 km wide). However, in eastern Georgia complex mid- and lower crustal reflections occur both beneath and to the north of the Brunswick anomaly, implying a broadened zone of crustal deformation.

  20. In vitro and in situ characterization of arthroscopic loop security and knot security of braided polyblend sutures: a biomechanical study.

    PubMed

    Armstrong, Lucas C; Chong, Alexander; Livermore, Ryan W; Prohaska, Daniel J; Doyon, Amanda N; Wooley, Paul H

    2015-04-01

    We conducted a study to evaluate biomechanical performance during destructive testing of several different suture materials in various arthroscopic knot configurations under both in vitro and in situ conditions. Surgeons of different levels of experience tied the knots. Three different arthroscopic knots (static surgeon's, Weston, Tennessee slider) with 3 reverse half-hitches on alternating posts were tested using Fiberwire, ForceFiber, Orthocord, and Ultrabraid suture materials under both in vitro and in situ (blood plasma at 37°C) conditions. Three surgeons of different experience levels tied the knots on a post 30 mm in circumference. A single load-to-failure test was performed. There were no significant in vitro-in situ differences for Ultrabraid in the different knot configurations or with the different experience levels. Surgeon B (intermediate experience) showed no significant differences between test conditions for any knot configuration or suture material. With Tennessee slider knots, surgeon C (least experience) showed significantly lower clinical failure load under both test conditions and had a higher percentage of complete knot slippage. Surgeon B had no knot slippage with use of Fiberwire. Both the aqueous environment and the surgeon's familiarity with certain knots have an effect on knot security. PMID:25844588

  1. [Repair of peripheral nerve effect by direct suture after elongation of nerve by traction].

    PubMed

    Wang, S; Wang, H; Chen, J

    1998-05-01

    To find new technique for repair of peripheral nerve defect, the nerve elongation repair technique was adopted. Two cases with nerve defect were treated by this method. One was a 12 year old male, the defect length of right radial nerve was 7.2 cm at the elbow. The other one was a 28 year old male, the defect length of left ulnar nerve the was 5 cm at elbow. In this method, the nerve was elongated by slow stretch from distal and proximal end of the ruptured nerve. After a few days, the nerve was repaired by direct suture. After operation, the function of nerves were recovered in 119 days and 114 days respectively. Follow-up for 5 years, the function of the effected limbs were recovered to the normal side. It was concluded that: (1) the peripheral never can be elongated by slow stretch; (2) to stretch the nerve end in a rubber tube can prevent adhesion and connective tissue blocking; (3) strength and supporting point of stretching should be designed carefully. PMID:10437049

  2. Geophysical Characterization of Some Terranes and the Geophysical Modeling of Candidate Suture Zones

    NASA Technical Reports Server (NTRS)

    Ravat, D.

    1997-01-01

    Indian participation in this project was terminated during the last year by a sudden withdrawal of support by the Department of Science and Technology, India, to the Indian Institute of Geomagnetism, Bombay. As a result, significant changes in the project focus had to be undertaken. Much of the work carried out at Southern Illinois University at Carbondale during the first year of the project anticipated the Indian participation and included development of computer programs to be used on gravity and magnetic data from the Indian subcontinent and preparations for fieldwork, tutorials, and workshops in India. Despite these setbacks, which were beyond our control, a number of significant tasks have been accomplished during the project period. These include: (1) Completion of digitization of the regional Bouguer gravity anomaly map of India and the regional ground total intensity magnetic anomaly map of India at an overdetermined spacing of 0.05 degrees. (2) We investigated and assessed the limitations of the Euler method using environmental examples because detailed aeromagnetic maps of parts of India were not available for interpretation by this method. (3) We also undertook an assessment of a suture zone between the Nyaza Craton (Archean) and the Mozambique Belt (Pan African) in the Kenya Rift, Africa, using gravity anomalies and the lithospheric seismological models. (4) We studied Magsat and high-altitude (approx. 4 km) aeromagnetic data over Canada.

  3. Diode laser welding for cornea suturing: an experimental study of the repair process

    NASA Astrophysics Data System (ADS)

    Pini, Roberto; Rossi, Francesca; Menabuoni, Luca; Mencucci, Rita; Menchini, Ugo; Ambrosini, Stefano; Vannelli, Gabriella

    2004-07-01

    We present an experimental study, performed in vivo, to evaluate the application of laser welding of the cornea. The welding technique is based on controlled irradiation provided by a diode laser (810 nm) operating at low power (60-90 mW), in association with the chromophore Indocyanine Green which was applied locally in the corneal wound to be repaired. Thirty-four rabbits were selected to undergo both conventional and laser-induced suturing of corneal wounds, to simulate cataract surgery and penetrating keratoplasty. A follow-up study 7-30 days after surgery was carried out by means of histological examinations of cornea slices, in order to investigate the healing process induced by laser welding. In the laser group, the analyses evidenced a faster and more effective restoration of the architecture of the stroma, with re-organization of both epithelium and endothelium. We also present measurements of the spectral absorption of Indocyanine Green and of the temperature rise in the corneal surface during laser welding.

  4. An experimental study on laser-induced suturing of venous grafts in cerebral revascularization surgery

    NASA Astrophysics Data System (ADS)

    Puca, Alfredo; Albanese, Alessio; Esposito, Giuseppe; Maira, Giulio; Rossi, Giacomo; Pini, Roberto

    2005-04-01

    To test laser-assisted high flow bypass in cerebral revascularization procedures, we set up an experimental model on rabbits which included harvesting a jugular vein graft and its implantation on the common carotid artery through a double end-to-side anastomosis. The study was carried out on 25 New Zealand rabbits by performing on each animal the proximal anastomosis using conventional suturing, while the distal one was obtained by means of low-power diode laser welding in association with the topical application of Indocyanine Green (ICG) solution to enhance local absorption of the laser light. After the procedure, the animals were subjected to a follow-up from 2 to 9 days. Bypass patency was evaluated by means of Doppler study. The vascular segments were excised and evaluated by histological and immunohistochemical examinations. Utilization of the diode laser was associated with a substantial shortening of the operative time, as well as with a more active endothelial regeneration process at the anastomotic site.

  5. Vessel sealing versus suture ligation for canine ovarian pedicle haemostasis: a randomised clinical trial.

    PubMed

    Schwarzkopf, I; Van Goethem, B; Vandekerckhove, P M; de Rooster, H

    2015-01-31

    Vessel sealing (VS) is well established in laparoscopic ovariectomy (OVE) in dogs. The objectives of this study were to evaluate the efficacy of ovarian pedicle haemostasis by VS using a commercially available VS tool in open OVE and compare it with suture ligation (SL). A prospective, randomised clinical trial including 20 female dogs was designed. Open OVE was performed via a standard mid-line celiotomy by a single surgeon using a standardised protocol. At random, the right ovarian pedicle was sealed (VS) or ligated (SL) whereas the left pedicle was treated by the alternative technique. Surgical times for procedural stages and intra-operative complications were recorded and statistically evaluated. Total surgical time was 29.28±11.13?minutes (range 12.50-62.13?minutes) and time from identification to removal of the ovary was significantly less when sealing (VS 2.22±0.58?minutes) than when ligating (SL 4.10±1.13?minutes P=0.0001). Intra-operative complications were rare for both techniques (failure of the electrode of the VS device (n=3); ovarian pedicle haemorrhage due to ligature slippage (n=1)). The results of the current study indicate that ovarian pedicle haemostasis achieved by VS is significantly faster than by placement of ligatures without appearing to compromise safety. PMID:25344574

  6. Novel flexible suture fixation for the distal tibiofibular syndesmotic joint injury: a cadaveric biomechanical model.

    PubMed

    Gough, Brandon E; Chong, Alexander C M; Howell, Steven J; Galvin, Joseph W; Wooley, Paul H

    2014-01-01

    Syndesmotic injuries of the ankle commonly occur by an external rotation force applied to the ankle joint. Ten fresh-frozen lower extremities from cadavers were used. A specially designed apparatus was used to stabilize the specimen and rotate the ankle joint from internally rotated 25° to externally rotated 35° at a rate of 6°/s for 10 cycles. Two stages were tested (stage I, specimens intact; and stage II, simulated pronation external rotation type injury with fixation). Group 1 was fixed with a novel suture construct across the syndesmotic joint, and group 2 was fixed with a single metallic screw. The torque, rotational angle, and 3-dimensional syndesmotic diastasis readings were recorded. Three-dimensional tibiofibular diastasis was identified. The fibula of the intact specimens displaced an average of 8.6 ± 1.7, 2.4 ± 1.0, and 1.4 ± 1.0 mm in the anterior, lateral, and superior direction, respectively, when the foot was externally rotated 35°. The sectioning of the syndesmostic ligaments and deltoid ligament resulted in a significant decrease in syndesmotic diastasis and foot torsional force (p < .05). The ligament-sectioned specimen lost 57% (externally rotated) and 17% (internally rotated) torsional strength compared with the intact specimen. Groups 1 and 2 provided similar biomechanical stability in this cadaveric model of a syndesmosis deficiency. PMID:24846162

  7. Neonatal neurological disorders involving the brainstem: neurosonographic approaches through the squamous suture and the foramen magnum.

    PubMed

    Tu, Yi-Fang; Chen, Cheng-Yu; Lin, Yuh-Jey; Chang, Ying-Chao; Huang, Chao-Ching

    2005-09-01

    Brainstem damage which often indicates a critical condition is usually underestimated by trans-anterior-fontanel neurosonography (NS) owing to the far-field limitations. Instead, NS alternately scanning through the squamous suture of the temporal bones and the foramen magnum could provide a better visualization of the brainstem structures. The NS characteristics of brainstem lesions caused by various neonatal neurological disorders, such as hypoxic-ischemic encephalopathy (HIE), metabolic encephalopathy, birth trauma and bacterial meningoencephalitis, can be depicted at the acute stage. An echogenic change in the midbrain was found in patients with HIE or metabolic encephalopathy. In addition to the echogenic change, bilateral transtentorial temporal lobe herniation distorting the contour of the midbrain was observed in a patient with group B streptococcus meningoencephalitis, whereas echogenic changes at the level of the pons and/or the medulla oblongata, mainly localized in the dorsal part, could be observed in newborns with severe HIE, maple syrup urine disease or birth trauma. In this pictorial assay, we demonstrate the feasibility of NS imaging in evaluating the entire brainstem structure of critically ill neonates in the near field and illustrate the characteristic features of brainstem involvement in various neonatal neurological disorders along with computed tomography or magnetic resonance imaging correlation. PMID:15809827

  8. Impedance matched thin metamaterials make metals absorbing

    NASA Astrophysics Data System (ADS)

    Mattiucci, N.; Bloemer, M. J.; Aközbek, N.; D'Aguanno, G.

    2013-11-01

    Metals are generally considered good reflectors over the entire electromagnetic spectrum up to their plasma frequency. Here we demonstrate an approach to tailor their absorbing characteristics based on the effective metamaterial properties of thin, periodic metallo-dielectric multilayers by exploiting a broadband, inherently non-resonant, surface impedance matching mechanism. Based on this mechanism, we design, fabricate and test omnidirectional, thin (<1 micron), polarization independent, extremely efficient absorbers (in principle being capable to reach A > 99%) over a frequency range spanning from the UV to the IR. Our approach opens new venues to design cost effective materials for many applications such as thermo-photovoltaic energy conversion devices, light harvesting for solar cells, flat panel display, infrared detectors, stray light reduction, stealth and others.

  9. Development and application of rotary shock absorber

    SciTech Connect

    Yamamoto, Kozo; Yamada, Toshihiro; Fukuyama, Katsura

    1995-12-31

    In recent years, rear suspension systems with a single shock absorber unit placed behind the engine, have been used primarily in the middle and large classes of motorcycles. Some features such as the longer rear wheel travel, progressive response characteristics and mass concentration at the center part of motorcycle are effective in improving maneuverability of the motorcycle. In the 1980s, the systems were introduced first in the off-road motorcycles and then in the on-road motorcycles. Performance of the systems are excellent, but there are demands for further improvement of suspension characteristics and space utility at the center part of motorcycle. For this purpose, the authors have developed a prototype of a rotary shock absorber and studied the applicability to modern motorcycles.

  10. Shock wave absorber having apertured plate

    DOEpatents

    Shin, Y.W.; Wiedermann, A.H.; Ockert, C.E.

    1983-08-26

    The shock or energy absorber disclosed herein utilizes an apertured plate maintained under the normal level of liquid flowing in a piping system and disposed between the normal liquid flow path and a cavity pressurized with a compressible gas. The degree of openness (or porosity) of the plate is between 0.01 and 0.60. The energy level of a shock wave travelling down the piping system thus is dissipated by some of the liquid being jetted through the apertured plate toward the cavity. The cavity is large compared to the quantity of liquid jetted through the apertured plate, so there is little change in its volume. The porosity of the apertured plate influences the percentage of energy absorbed.

  11. Shock wave absorber having apertured plate

    DOEpatents

    Shin, Yong W. (Western Springs, IL); Wiedermann, Arne H. (Chicago Heights, IL); Ockert, Carl E. (Vienna, VA)

    1985-01-01

    The shock or energy absorber disclosed herein utilizes an apertured plate maintained under the normal level of liquid flowing in a piping system and disposed between the normal liquid flow path and a cavity pressurized with a compressible gas. The degree of openness (or porosity) of the plate is between 0.01 and 0.60. The energy level of a shock wave travelling down the piping system thus is dissipated by some of the liquid being jetted through the apertured plate toward the cavity. The cavity is large compared to the quantity of liquid jetted through the apertured plate, so there is little change in its volume. The porosity of the apertured plate influences the percentage of energy absorbed.

  12. Imaging highly absorbing nanoparticles using photothermal microscopy

    NASA Astrophysics Data System (ADS)

    Lussier, Simon-Alexandre; Moradi, Hamid; Price, Alain; Murugkar, Sangeeta

    2015-03-01

    Gold nanoparticles (NPs) have tremendous potential in biomedicine. They can be used as absorbing labels inside living cells for the purpose of biomedical imaging, biosensing as well as for photothermal therapy. We demonstrate photothermal imaging of highly-absorbing particles using a pump-probe setup. The photothermal signal is recovered by heterodyne detection, where the excitation pump laser is at 532 nm and the probe laser is at 638 nm. The sample is moved by a scanning stage. Proof of concept images of red polystyrene microspheres and gold nanoparticles are obtained with this home-built multimodal microscope. The increase in temperature at the surface of the gold NPs, due to the pump laser beam, can be directly measured by means of this photothermal microscope and then compared with the results from theoretical predictions. This technique will be useful for characterization of nanoparticles of different shapes, sizes and materials that are used in cancer diagnosis and therapy.

  13. Vibration absorber modeling for handheld machine tool

    NASA Astrophysics Data System (ADS)

    Abdullah, Mohd Azman; Mustafa, Mohd Muhyiddin; Jamil, Jazli Firdaus; Salim, Mohd Azli; Ramli, Faiz Redza

    2015-05-01

    Handheld machine tools produce continuous vibration to the users during operation. This vibration causes harmful effects to the health of users for repeated operations in a long period of time. In this paper, a dynamic vibration absorber (DVA) is designed and modeled to reduce the vibration generated by the handheld machine tool. Several designs and models of vibration absorbers with various stiffness properties are simulated, tested and optimized in order to diminish the vibration. Ordinary differential equation is used to derive and formulate the vibration phenomena in the machine tool with and without the DVA. The final transfer function of the DVA is later analyzed using commercial available mathematical software. The DVA with optimum properties of mass and stiffness is developed and applied on the actual handheld machine tool. The performance of the DVA is experimentally tested and validated by the final result of vibration reduction.

  14. Dielectric studies of water absorbed in epoxies 

    E-print Network

    Pham, Ha Quoc

    1987-01-01

    ent) Nay 1987 ABSTRACT Dielectric Studies of Mater Absorbed in Epoxies. (May 1987) Ha I)uoc Pham, B. S. , Tokyo University of Agriculture Chairman of Advisory Committee: C. A. J. Hoeve Epoxy resins are industrially important polymers... of speculation. Since water has a large dipole moment, its mobility and inter- action with polymers can be studied by dielectric spectroscopy as a function of temperature, frequency, and water content, in an alter- nating electric field. Hoeve and co...

  15. Tech Transfer Webinar: Energy Absorbing Materials

    ScienceCinema

    Duoss, Eric

    2014-07-15

    A new material has been designed and manufactured at LLNL that can absorb mechanical energy--a cushion--while also providing protection against sheering. This ordered cellular material is 3D printed using direct ink writing techniques under development at LLNL. It is expected to find utility in application spaces that currently use unordered foams, such as sporting and consumer goods as well as defense and aerospace.

  16. Design and Manufacture of Energy Absorbing Materials

    SciTech Connect

    Duoss, Eric

    2014-05-28

    Learn about an ordered cellular material that has been designed and manufactured using direct ink writing (DIW), a 3-D printing technology being developed at LLNL. The new material is a patterned cellular material that can absorb mechanical energy-a cushion-while also providing protection against sheering. This material is expected to find utility in application spaces that currently use unordered foams, such as sporting and consumer goods as well as defense and aerospace.

  17. BIOCHEMISTRY: An Absorbing Study of Cholesterol

    NSDL National Science Digital Library

    Hooman Allayee (University of California, Los Angeles (UCLA) School of Medicine; Department of Medicine and the Department of Microbiology, Immunology and Molecular Genetics)

    2000-12-01

    Access to the article is free, however registration and sign-in are required. We obtain sterols from the animal and plant food that we eat. How these plant and animal sterols are absorbed, transported around the body, and excreted has been the subject of much investigation. In a Perspective, Allayee and colleagues discuss a new study (Berge et al.) that implicates two new ABC transporter proteins in the efflux of plant and animal sterols from gut epithelial cells into the gut lumen.

  18. Tech Transfer Webinar: Energy Absorbing Materials

    SciTech Connect

    Duoss, Eric

    2014-06-17

    A new material has been designed and manufactured at LLNL that can absorb mechanical energy--a cushion--while also providing protection against sheering. This ordered cellular material is 3D printed using direct ink writing techniques under development at LLNL. It is expected to find utility in application spaces that currently use unordered foams, such as sporting and consumer goods as well as defense and aerospace.

  19. Dielectric studies of water absorbed in epoxies

    E-print Network

    Pham, Ha Quoc

    1987-01-01

    ent) Nay 1987 ABSTRACT Dielectric Studies of Mater Absorbed in Epoxies. (May 1987) Ha I)uoc Pham, B. S. , Tokyo University of Agriculture Chairman of Advisory Committee: C. A. J. Hoeve Epoxy resins are industrially important polymers.... They are used in many applications such as surface coatings, adhesives, elqctronic encapsulation and structural composites. Water absorption in epoxy resins is known to be detrimental to resin performances. One example is the unusually large lowering...

  20. Microwave absorbing properties of high titanium slag

    Microsoft Academic Search

    Li-bo Zhang; Guo Chen; Jin-hui Peng; Jin Chen; Sheng-hui Guo; Xin-hui Duan

    2009-01-01

    Microwave absorbing properties of high titanium slag were investigated by using microwave cavity perturbation technique. High\\u000a titanium slag containing more than 90% TiO2 was prepared by carbothermal reduction of ilmenite. The temperature rise curve of high titanium slag in microwave heating\\u000a process was obtained. Crystalline compounds of high titanium slag before and after microwave irradiation were obtained and\\u000a characterized by

  1. Lightweight Energy Absorbers for Blast Containers

    NASA Technical Reports Server (NTRS)

    Balles, Donald L.; Ingram, Thomas M.; Novak, Howard L.; Schricker, Albert F.

    2003-01-01

    Kinetic-energy-absorbing liners made of aluminum foam have been developed to replace solid lead liners in blast containers on the aft skirt of the solid rocket booster of the space shuttle. The blast containers are used to safely trap the debris from small explosions that are initiated at liftoff to sever frangible nuts on hold-down studs that secure the spacecraft to a mobile launch platform until liftoff.

  2. Design and Manufacture of Energy Absorbing Materials

    ScienceCinema

    Duoss, Eric

    2014-05-30

    Learn about an ordered cellular material that has been designed and manufactured using direct ink writing (DIW), a 3-D printing technology being developed at LLNL. The new material is a patterned cellular material that can absorb mechanical energy-a cushion-while also providing protection against sheering. This material is expected to find utility in application spaces that currently use unordered foams, such as sporting and consumer goods as well as defense and aerospace.

  3. Microwave Studies on Strontium Ferrite Based Absorbers

    Microsoft Academic Search

    A. Verma; R. G. Mendiratta; T. C. Goel; D. C. Dube

    2002-01-01

    Single layer microwave absorbers based on strontium ferrite-epoxy composites have been fabricated and their reflection loss characteristics studied in the X-band (8–12.4 GHz) of microwave frequencies. Permittivity (?r' - j?r?) and permeability (µr' - jµr?) of Co and Ti added strontium ferrite SrCoxTixFe12 - 2xO19 (x = 0.1 to 0.9 in steps of 0.2), have been measured. Thickness of the

  4. Electrochemical cells having hydrogen gas absorbing agent

    Microsoft Academic Search

    F. E. Parsen; T. T. Yatabe

    1982-01-01

    An agent which absorbs hydrogen gas for electrochemical cells is made from an oxide of manganese and nickel, cobalt or iron. At temperatures above about 40°C., the oxide of manganese can be replaced by lead oxide. Hydrophobic binders can be added to the agent or the agent can be microencapsulated in water-impermeable but hydrogen-gas-permeable materials. The agent is preferably added

  5. Development of monofilar rotor hub vibration absorber

    NASA Technical Reports Server (NTRS)

    Duh, J.; Miao, W.

    1983-01-01

    A design and ground test program was conducted to study the performance of the monofilar absorber for vibration reduction on a four-bladed helicopter. A monofilar is a centrifugal tuned two degree-of-freedom rotor hub absorber that provides force attenuation at two frequencies using the same dynamic mass. Linear and non-linear analyses of the coupled monofilar/airframe system were developed to study tuning and attenuation characteristics. Based on the analysis, a design was fabricated and impact bench tests verified the calculated non-rotating natural frequencies and mode shapes. Performance characteristics were measured using a rotating absorber test facility. These tests showed significant attenuation of fixed-system 4P hub motions due to 3P inplane rotating-system hub forces. In addition, detuning effects of the 3P monofilar modal response were small due to the nonlinearities and tuning pin slippage. However, attenuation of 4P hub motions due to 5P inplane hub forces was poor. The performance of the 5P monofilar modal response was degraded by torsional motion of the dynamic mass relative to the support arm which resulted in binding of the dynamic components. Analytical design studies were performed to evaluate this torsional motion problem. An alternative design is proposed which may alleviate the torsional motion of the dynamic mass.

  6. Timing the warm absorber in NGC4051

    NASA Astrophysics Data System (ADS)

    Silva, C.; Uttley, P.; Costantini, E.

    2015-07-01

    In this work we have combined spectral and timing analysis in the characterization of highly ionized outflows in Seyfert galaxies, the so-called warm absorbers. Here, we present our results on the extensive ˜600ks of XMM-Newton archival observations of the bright and highly variable Seyfert 1 galaxy NGC4051, whose spectrum has revealed a complex multi-component wind. Working simultaneously with RGS and PN data, we have performed a detailed analysis using a time-dependent photoionization code in combination with spectral and Fourier timing techniques. This method allows us to study in detail the response of the gas due to variations in the ionizing flux of the central source. As a result, we will show the contribution of the recombining gas to the time delays of the most highly absorbed energy bands relative to the continuum (Silva, Uttley & Costantini in prep.), which is also vital information for interpreting the continuum lags associated with propagation and reverberation effects in the inner emitting regions. Furthermore, we will illustrate how this powerful method can be applied to other sources and warm-absorber configurations, allowing for a wide range of studies.

  7. Cobalt catalyst recovery using heavy olefin absorbent

    SciTech Connect

    Summerlin, W.H.

    1993-08-17

    A method is described for removing cobalt values from the crude product of a cobalt-catalyzed hydroformylation reaction formed from an olefinic feedstock, said crude product containing cobalt compounds in addition to an organic hydroformylation reaction product, which comprises: (a) contacting said crude product with water and an organic acid selected from the group consisting of: formic acid, acetic acid, propionic acid, and acids having a boiling point approximately the same as water; (b) contacting the product of step (a) with a stream of stripping gas to entrain volatile cobalt compounds and light hydrocarbons in said stripping gas, whereby said entrained volatile cobalt compounds are taken out overhead and organic hydroformylation reaction products and water containing water soluble cobaltous salts dissolved therein are taken out as bottoms; (c) separating said water containing water soluble cobaltous salt of step (b) from said organic hydroformylation reaction products; (d) diverting said organic hydroformylation reaction product of step (c) for further downstream treatment by at least one method selected from the group consisting of: hydrogenation and distillation; and (e) contacting said volatile cobalt compounds from step (b) with an olefinic absorbent having a molecular weight greater than said olefinic feedstock, whereby said volatile cobalt compounds are absorbed into said olefinic absorbent, and said stripping gas and said light hydrocarbons are taken overhead as a gaseous product.

  8. Shock wave absorber having a deformable liner

    DOEpatents

    Youngdahl, C.K.; Wiedermann, A.H.; Shin, Y.W.; Kot, C.A.; Ockert, C.E.

    1983-08-26

    This invention discloses a shock wave absorber for a piping system carrying liquid. The absorber has a plastically deformable liner defining the normal flow boundary for an axial segment of the piping system, and a nondeformable housing is spaced outwardly from the liner so as to define a gas-tight space therebetween. The flow capacity of the liner generally corresponds to the flow capacity of the piping system line, but the liner has a noncircular cross section and extends axially of the piping system line a distance between one and twenty times the diameter thereof. Gas pressurizes the gas-tight space equal to the normal liquid pressure in the piping system. The liner has sufficient structural capacity to withstand between one and one-half and two times this normal liquid pressures; but at greater pressures it begins to plastically deform initially with respect to shape to a more circular cross section, and then with respect to material extension by circumferentially stretching the wall of the liner. A high energy shock wave passing through the liner thus plastically deforms the liner radially into the gas space and progressively also as needed in the axial direction of the shock wave to minimize transmission of the shock wave beyond the absorber.

  9. Comparison of piezoelectronic networks acting as distributed vibration absorbers

    E-print Network

    Boyer, Edmond

    Comparison of piezoelectronic networks acting as distributed vibration absorbers Corrado Maurinia, Virginia Polytechnic Institute and State University, Blacksburg VA 24061, USA Abstract Electric vibration absorbers made of distributed piezoelectric devices for the control of beam vibrations are studied

  10. Inorganic UV absorbers for the photostabilisation of wood-clearcoating systems: Comparison with organic UV absorbers

    NASA Astrophysics Data System (ADS)

    Aloui, F.; Ahajji, A.; Irmouli, Y.; George, B.; Charrier, B.; Merlin, A.

    2007-02-01

    Inorganic UV absorbers which are widely used today were originally designed neither as a UV blocker in coatings applications, nor for wood protection. In recent years however, there has been extensive interest in these compounds, especially with regard to their properties as a UV blocker in coating applications. In this work, we carried out a comparative study to look into some inorganic and organic UV absorbers used in wood coating applications. The aim of this study is to determine the photostabilisation performances of each type of UV absorbers, to seek possible synergies and the influences of different wood species. We have also searched to find eventual correlation between these performances and the influence of UV absorbers on the film properties. Our study has compared the performances of the following UV absorbers: hombitec RM 300, hombitec RM 400 from the Sachtleben Company; transparent yellow and red iron oxides from Sayerlack as inorganic UV absorbers; organic UV absorbers Tinuvin 1130 and Tinuvin 5151 from Ciba Company. The study was carried out on three wood species: Abies grandis, tauari and European oak. The environmental constraints (in particular the limitation of the emission of volatile organic compounds VOCs) directed our choice towards aqueous formulations marketed by the Sayerlack Arch Coatings Company. The results obtained after 800 h of dry ageing showed that the Tinuvins and the hombitecs present better wood photostabilisations. On the other hand in wet ageing, with the hombitec, there are appearances of some cracks and an increase in the roughness of the surface. This phenomenon is absent when the Tinuvins are used. With regard to these results, the thermomechanical analyses relating to the follow-up of the change of the glass transition temperature ( Tg) of the various coating systems, show a different behaviour between the two types of absorbers. However, contrary to organic UV absorbers, inorganic ones tend to increase Tg during ageing, and, consequently decrease the flexibility of films. These phenomena can lead to the appearance of cracks found in the case of the wet weathering.

  11. Absorbing Boundary Conditions for the Wave Equation and Parallel Computing

    E-print Network

    Halpern, Laurence

    to the truncation boundary which leads to a new way of optimizing absorbing boundary conditions for truncatingAbsorbing Boundary Conditions for the Wave Equation and Parallel Computing Martin J. Gander # Laurence Halpern + March 4, 2005 Abstract Absorbing boundary conditions have been developed for various

  12. An optimal perfectly matched layer with unbounded absorbing function for

    E-print Network

    Rodríguez, Rodolfo

    on the last mentioned technique: local absorbing boundary conditions (ABCs) can be used to preserveAn optimal perfectly matched layer with unbounded absorbing function for time-harmonic acoustic an optimal bounded Perfectly Matched Layer (PML) technique by choosing a particular absorbing function

  13. Absorbing Boundary Conditions for the Wave Equation and Parallel Computing

    E-print Network

    Gander, Martin J.

    boundary which leads to a new way of optimizing absorbing boundary conditions for truncating domains. WeAbsorbing Boundary Conditions for the Wave Equation and Parallel Computing Martin J. Gander # Laurence Halpern + May 8, 2003 Abstract Absorbing boundary conditions have been developed for various types

  14. 14 CFR 27.475 - Tires and shock absorbers.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ...2014-01-01 2014-01-01 false Tires and shock absorbers. 27.475 Section 27.475... Ground Loads § 27.475 Tires and shock absorbers. Unless otherwise prescribed...assumed to be in their static position and the shock absorbers to be in their most critical...

  15. 14 CFR 27.475 - Tires and shock absorbers.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ...2010-01-01 2010-01-01 false Tires and shock absorbers. 27.475 Section 27.475... Ground Loads § 27.475 Tires and shock absorbers. Unless otherwise prescribed...assumed to be in their static position and the shock absorbers to be in their most critical...

  16. 14 CFR 27.475 - Tires and shock absorbers.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ...2011-01-01 2011-01-01 false Tires and shock absorbers. 27.475 Section 27.475... Ground Loads § 27.475 Tires and shock absorbers. Unless otherwise prescribed...assumed to be in their static position and the shock absorbers to be in their most critical...

  17. 14 CFR 29.475 - Tires and shock absorbers.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ...2014-01-01 2014-01-01 false Tires and shock absorbers. 29.475 Section 29.475... Ground Loads § 29.475 Tires and shock absorbers. Unless otherwise prescribed...assumed to be in their static position and the shock absorbers to be in their most critical...

  18. 14 CFR 29.475 - Tires and shock absorbers.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ...2011-01-01 2011-01-01 false Tires and shock absorbers. 29.475 Section 29.475... Ground Loads § 29.475 Tires and shock absorbers. Unless otherwise prescribed...assumed to be in their static position and the shock absorbers to be in their most critical...

  19. 14 CFR 27.475 - Tires and shock absorbers.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ...2013-01-01 2013-01-01 false Tires and shock absorbers. 27.475 Section 27.475... Ground Loads § 27.475 Tires and shock absorbers. Unless otherwise prescribed...assumed to be in their static position and the shock absorbers to be in their most critical...

  20. 14 CFR 27.475 - Tires and shock absorbers.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ...2012-01-01 2012-01-01 false Tires and shock absorbers. 27.475 Section 27.475... Ground Loads § 27.475 Tires and shock absorbers. Unless otherwise prescribed...assumed to be in their static position and the shock absorbers to be in their most critical...

  1. 14 CFR 29.475 - Tires and shock absorbers.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ...2012-01-01 2012-01-01 false Tires and shock absorbers. 29.475 Section 29.475... Ground Loads § 29.475 Tires and shock absorbers. Unless otherwise prescribed...assumed to be in their static position and the shock absorbers to be in their most critical...

  2. 14 CFR 29.475 - Tires and shock absorbers.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ...2010-01-01 2010-01-01 false Tires and shock absorbers. 29.475 Section 29.475... Ground Loads § 29.475 Tires and shock absorbers. Unless otherwise prescribed...assumed to be in their static position and the shock absorbers to be in their most critical...

  3. 14 CFR 29.475 - Tires and shock absorbers.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ...2013-01-01 2013-01-01 false Tires and shock absorbers. 29.475 Section 29.475... Ground Loads § 29.475 Tires and shock absorbers. Unless otherwise prescribed...assumed to be in their static position and the shock absorbers to be in their most critical...

  4. Modified Berenger PML absorbing boundary condition for FDTD meshes

    Microsoft Academic Search

    B. Chen; D. G. Fang; B. H. Zhou

    1995-01-01

    A new modified, perfectly matched layer absorbing boundary condition (MPML ABC) is presented. In the MPML, the introducing of extra degrees of freedom provides the possibility of adjusting the parameters of nonphysical material absorber (PML) for the purpose of enhancing the attenuation rate of the evanescent modes. Compared to Berenger PML, the MPML is more efficient in absorbing the evanescent

  5. Quantitative Photo-Acoustic Imaging of Small Absorbers Habib Ammari

    E-print Network

    Kang, Hyeonbae

    Quantitative Photo-Acoustic Imaging of Small Absorbers Habib Ammari Emmanuel Bossy Vincent Jugnon Hyeonbae Kang§ December 1, 2009 Abstract In photo-acoustic imaging, energy absorption causes thermo absorber from the absorbed density. AMS subject classifications. 31B20, 35B37,35L05 Key words. photo

  6. Metamorphic Evolution of the Main Collisional Suture Zone Between East and West Gondwana

    NASA Astrophysics Data System (ADS)

    Abu-Alam, Tamer; Grosch, Eugene

    2013-04-01

    Petrological and metamorphic constraints from five metamorphic complexes which were exhumed during the collision between East- and West-Gondwana across the main collisional suture zone are presented. These include: (a) Meatiq complex in Eastern Desert of Egypt, (b) Feiran-Solaf complex in Sinai, Egypt (c) Sa'al-Zaghra complex in Sinai, Egypt, (d) Great Ruaha River area in the Mozambique Belt, and (e) Western Dronning Maud Land, East Antarctica. The metamorphic results from these complexes are compared and provide insight into the nature of Pan-African crust formation processes during Gondwana assembly. In this study we present differences and similarities between various field areas in the central collisional suture zone of Gondwana that sheds light on the crustal accretion and supercontinent assembly process from a metamorphic perspective. The Meatiq complex in the Eastern Desert of Egypt consists of a low-grade volcanic arc sequence that covers a higher-grade, biotite-garnet gneiss metamorphic core complex. A sinistral shear zone - the Najd Fault System - separates the high-grade rocks from the low-grade volcanic sequence. The combination between published data and new thermodynamic modeling shows that both the high-grade and the low-grade rocks record single clockwise P -T paths. The peak metamorphic conditions of the high-grade rocks are T = 650-700 oC and P = 7-7.5 kbar, whereas the low-grade rocks record conditions of T = 400-450 oC and P = 3-4 kbar. In Sinai, the Najd Fault System is not exposed due to the voluminous intrusion of ca. 540 Ma post-tectonic granites. However, both the garnet-biotite gneisses of the Feiran-Solaf complex (T = 700-750 oC and P = 7-8 kbar) and the low-grade rocks (T = 400-450 oC and P = 2-3 kbar) of Wadi El Kid record very similar metamorphic conditions and clockwise P -T paths to those in Eastern Desert, Egypt. Conversely, the Sa'al-Zaghra complex shows anticlockwise P-T path with peak conditions of 2.5 kbar and 42 oC. It worth mention that the peak metamorphic age of the Sa'al-Zaghra complex is much older than the Pan-African event (ca. 1100 Ma). In western Dronning Maud Land (Antarctica), a petrological and metamorphic comparison of Mesoproterozoic metabasic rocks on the eastern margin of the Archean Grunehogna Craton and the adjacent Maud Belt, revealed a difference in peak metamorphic conditions from T = 280 ± 30 oC to 710-750 oC and P = 2 ± 1.5 to 8.5-11 kbar over a distance of only 30 km across a major glacial valley. The high-grade PT-constraints derived for the western extreme of the Maud Belt, is very similar to that reported for the eastern Maud Belt dated at ca. 550 Ma. These PT-constraints do not support the presence of a westward decreasing metamorphic field gradient within the Maud Belt as previously proposed. The data presented here suggests that the inferred sub-glacial boundary between the Grunehogna Craton and the Maud Belt, might reflect a major Pan-African thrust, with the Maud Belt representing the continuation of the East African Mozambique Belt into East Antarctica.

  7. Triassic sedimentation and postaccretionary crustal evolution along the Solonker suture zone in Inner Mongolia, China

    NASA Astrophysics Data System (ADS)

    Li, Shan; Wilde, Simon A.; He, Zhengjun; Jiang, Xiaojun; Liu, Renyan; Zhao, Lei

    2014-06-01

    Detrital zircon U-Pb dating of the Xingfuzhilu Formation in southern Inner Mongolia yields a maximum depositional age of around 220 Ma. The predominantly Permian and Triassic zircons are characterized by oscillatory zoning and euhedral shapes, with mostly positive zircon ?Hf(t) values (+2.0 to +16.4), indicating that they were derived from a proximal magmatic source. Early-Middle Paleozoic zircons have variable zircon ?Hf(t) values from -6.2 to +11.2 and are characterized by weak oscillatory zoning and subhedral-subrounded shapes, suggesting that the sources are a proximal magmatic arc, possibly mixed with components of the Ondor Sum magmatic arc and the magmatic arc at the northern margin of the North China Craton. The remnants of Precambrian blocks in the southeastern Central Asian Orogenic Belt (CAOB), and the North China Craton may also have been a minor source region for the Xingfuzhilu succession. These results, combined with regional data, indicate that a closing remnant ocean basin or narrow seaway possibly existed in the Middle Permian (Guadalupian) immediately prior to final collision of the CAOB and closure of the Paleo-Asian Ocean. Subsequent collision resulted in the crustal uplift and thickening along the Solonker suture zone, accompanied by possible slab break-off and lithospheric delamination during the Latest Permian to Middle Triassic. The resultant orogen in the Late Triassic underwent exhumation and denudation of rocks in response to the postorogenic collapse and regional extension. Vertical crustal growth in the Triassic is documented by detrital zircons from the Xingfuzhilu Formation and appears to have been widespread across entire eastern CAOB.

  8. Neoproterozoic extension in the greater dharwar craton: A reevaluation of the "betsimisaraka suture" in madagascar

    USGS Publications Warehouse

    Tucker, R.D.; Roig, J.-Y.; Delor, C.; Amlin, Y.; Goncalves, P.; Rabarimanana, M.H.; Ralison, A.V.; Belcher, R.W.

    2011-01-01

    The Precambrian shield of Madagascar is reevaluated with recently compiled geological data and new U-Pb sensitive high-resolution ion microprobe (SHRIMP) geochronology. Two Archean domains are recognized: the eastern Antongil-Masora domain and the central Antananarivo domain, the latter with distinctive belts of metamafic gneiss and schist (Tsaratanana Complex). In the eastern domain, the period of early crust formation is extended to the Paleo-Mesoarchean (3.32-3.15 Ga) and a supracrustal sequence (Fenerivo Group), deposited at 3.18 Ga and metamorphosed at 2.55 Ga, is identified. In the central domain, a Neoarchean period of high-grade metamorphism and anatexis that affected both felsic (Betsiboka Suite) and mafic gneisses (Tsaratanana Complex) is documented. We propose, therefore, that the Antananarivo domain was amalgamated within the Greater Dharwar Craton (India + Madagascar) by a Neoarchean accretion event (2.55-2.48 Ga), involving emplacement of juvenile igneous rocks, high-grade metamorphism, and the juxtaposition of disparate belts of mafic gneiss and schist (metagreenstones). The concept of the "Betsimisaraka suture" is dispelled and the zone is redefined as a domain of Neoproterozoic metasedimentary (Manampotsy Group) and metaigneous rocks (Itsindro-Imorona Suite) formed during a period of continental extension and intrusive igneous activity between 840 and 760 Ma. Younger orogenic convergence (560-520 Ma) resulted in east-directed overthrusting throughout south Madagascar and steepening with local inversion of the domain in central Madagascar. Along part of its length, the Manampotsy Group covers the boundary between the eastern and central Archean domains and is overprinted by the Angavo-Ifanadiana high-strain zone that served as a zone of crustal weakness throughout Cretaceous to Recent times.

  9. Back to the Suture: The Distribution of Intraspecific Genetic Diversity in and Around Anatolia

    PubMed Central

    Bilgin, Rasit

    2011-01-01

    The effect of ice ages in speciation and diversification is well established in the literature. In Europe, the Iberian, the Italian and the Balkan peninsulas comprise the main glacial refugia, where the subsequent re-population of Europe started. Though not studied as extensively, Anatolia has also been hinted to be a potential glacial refugium for Europe, and with its proximity to the Caucasus and the Middle East at the same time, has potential to exhibit high levels of intraspecific diversity. The more ubiquitous use and cheaper availability of molecular methods globally now makes it possible to better understand molecular ecology and evolution of the fauna and flora in the genetically understudied regions of the world, such as Anatolia. In this review, the molecular genetic studies undertaken in Anatolia in the last decade, for 29 species of plants and animals, are examined to determine general phylogeographic patterns. In this regard, two major patterns are observed and defined, showing genetic breaks within Anatolia and between Anatolia and the Balkans. A third pattern is also outlined, which suggests Anatolia may be a center of diversity for the surrounding regions. The patterns observed are discussed in terms of their relevance to the location of suture zones, postglacial expansion scenarios, the effect of geographic barriers to gene flow and divergence time estimates, in order to better understand the effect of the geological history of Anatolia on the evolutionary history of the inhabitant species. In view of the current state of knowledge delineated in the review, future research directions are suggested. PMID:21747726

  10. Interpretation of the 'Trans European Suture Zone' by a multiscale aeromagnetic dataset

    NASA Astrophysics Data System (ADS)

    Milano, Maurizio; Fedi, Maurizio

    2015-04-01

    One of the main goals in crustal geomagnetic prospecting is to obtain information about the sources of magnetic anomalies in order to model the geological structure of the Earth's crust. A "multiscale approach" is very useful to analyze, concurrently, the effects of sources placed at different depths, observing the potential field at various altitudes from the Earth's surface. The aim of this work is the study of the main geological structure of Central Europe, the "Trans European Suture Zone", using high-resolution aeromagnetic data. The 'TESZ' is the most prominent geological boundary in Europe, oriented NW-SE from the North Sea to the Black Sea and separating The Paleozoic platform in the south and west from the Precambrian East European craton. At high altitudes the European magnetic field is characterized by a large and extended magnetic low, which is related to the deep TESZ structure. The study of this anomaly field began by detecting the position of the anomaly sources using the properties of the Analytical Signal modulus (AS). The AS map presents anomalies in which the dipolar behavior of the magnetic anomaly field is substantially removed and the maxima are placed directly above the anomaly sources. The multiridge method has been applied to the Analytical Signal modulus in order to have information about the sources' depths in the TESZ region. Many profiles were tracked transversely to the fault line in order to map at depth the main magnetic discontinuities. Cause of the low heat flow of the Central Europe, we were able to get information also in the lower crust and to map the deep Moho discontinuity. Available geological sections based on seismic data show consistent results with our interpretation.

  11. Laparoscopic inguinal hernia repair in children using the percutaneous internal ring suturing technique – own experience

    PubMed Central

    Patkowski, Dariusz

    2014-01-01

    Introduction Percutaneous internal ring suturing (PIRS) is a method of laparoscopic herniorrhaphy, i.e. percutaneous closure of the internal inguinal ring under the control of a telescope placed in the umbilicus. Aim To evaluate the usefulness of the PIRS technique. Material and methods Fifty-five children (39 girls and 16 boys) underwent surgery using this method in our institution between 2008 and 2010. Results In 10 cases the presence of an open inguinal canal on the opposite side was also noted during surgery, and umbilical hernia was recognized in 2 patients. In 5 cases it was necessary to convert to the open surgery because of the inability to continue the laparoscopic procedure. In 1 case, male pseudohermaphroditism was diagnosed during surgery. Recurrent inguinal hernia required a conventional method of surgery in 1 child. Other children did not exhibit the characteristics of hernia recurrence. The inguinal canals were followed up with postoperative ultrasound examination in 29 children. In 23 children, the ultrasound examination showed no dilatation of the inguinal canal. In the other 6 children dilatation of the inguinal canal or the presence of fluid within the inguinal canal was observed during ultrasound. In 6 children symptoms such as swelling and soreness around the inguinal canal developed within 3 to 6 months after surgery. Conclusions Inguinal hernia surgery using the PIRS procedure is an alternative, effective, minimally invasive method of surgery. Visualization of the peritoneal cavity allows for detection of other abnormalities, as well as for performing other procedures during the same session (such as closing the contralateral inguinal canal or umbilical hernia surgery). PMID:24729810

  12. Effect of the suture technique on postoperative pain, swelling and trismus after removal of lower third molars: A randomized clinical trial

    PubMed Central

    Gómez-Santos, Laila; Sánchez-Torres, Alba; Herráez-Vilas, José-María

    2015-01-01

    Background To evaluate the intensity of pain, swelling and trismus after the removal of impacted lower third molars comparing two different suture techniques of the triangular flap: the complete suture of the distal incision and relieving incision and the partial suture with only one suture knot for closure of the corner of the flap and the closure of the distal incision, without suturing the relieving incision. Material and Methods A prospective, randomized, crossover clinical trial was conducted in 40 patients aged from 18 to 45 years who underwent surgical extraction of impacted lower third molars at the Department of Oral Surgery in the Odontological Hospital of the University of Barcelona during the year 2011. Patients were randomly divided in 2 groups. Two different techniques (hermetical closure and partial closure of the wound) were performed separated by a one month washout period in each patient. Postoperative pain, swelling and trismus were evaluated prior to the surgical procedure and also at 2 and 7 days post operatively. Results No statistically significant differences were observed for pain (p<0.06), trismus (p<0.71) and swelling (p<0.05) between the test and the control group. However, the values of the three parameters related to the test group were lower than those for the control group. Conclusions Partial closure of the flap without suturing the relieving incision after surgical extraction of lower third molars reduces operating time and it does not produce any postoperative complications compared with complete closure of the wound. Key words: Third molar, surgical flaps, suture techniques, postoperative pain, swelling, trismus. PMID:25662551

  13. Bioabsorbable poly- l \\/ d -lactide (PLDLA) 96\\/4 triple-stranded bound suture in the modified Kessler repair: an ex vivo static and cyclic tensile testing study in a porcine extensor tendon model

    Microsoft Academic Search

    Anna-Kaarina Viinikainen; Harry Göransson; Katja Huovinen; Minna Kellomäki; Pertti Törmälä; Pentti Rokkanen

    2009-01-01

    Previously the biomechanical properties of the bioabsorbable poly-l\\/d-lactide (PLDLA) 96\\/4 suture were found suitable for flexor tendon repair. In this study, three PLDLA suture strands were\\u000a bound together parallel to each other side-by-side to form a triple-stranded bound suture and the modified Kessler tendon\\u000a repair was performed. The biomechanical properties of the PLDLA repair in porcine extensor tendons ex vivo

  14. Notes 10. The dynamic vibration absorber 

    E-print Network

    San Andres, Luis

    2008-01-01

    ? cos ? t? ?+ () ?= [4] Thus, the periodic force response of the system (Kp,Mp) is : [3] as the frequency ratior ? ? np =with: Z p r() F o K p 1 r 2 ? () := or Zp F o K p ? 2 M p ??() = K p ? 2 M p ??()Zp? F o = Substitution of [2] into [1] gives: [2...] Luis San Andres (c) 2008 MEEN 363 - 617 THE VIBRATION ABSORBER Preamble - A NEED arises: Consider the periodic forced response of a primary system (Kp-Mp) defined by X p (t) K p F(t) M P M p 10 3 lb?:= K p 110 5 ? lbf in ?:= Its natural frequency is...

  15. Absorbing photonic crystals for thin film photovoltaics

    NASA Astrophysics Data System (ADS)

    El Daif, O.; Drouard, E.; Gomard, G.; Meng, X.; Kaminski, A.; Fave, A.; Lemiti, M.; Garcia Cavrel, E.; Roca i Cabarrocas, P.; Ahn, S.; Jeon, H.; Seassal, C.

    2010-05-01

    The absorption of thin hydrogenated amorphous silicon layers can be efficiently enhanced through a controlled periodic patterning. Light is trapped through coupling with photonic Bloch modes of the periodic structures, which act as an absorbing planar photonic crystal. We theoretically demonstrate this absorption enhancement through one or two dimensional patterning, and show the experimental feasibility through large area holographic patterning. Numerical simulations show over 50% absorption enhancement over the part of the solar spectrum comprised between 380 and 750nm. It is experimentally confirmed by optical measurements performed on planar photonic crystals fabricated by laser holography and reactive ion etching.

  16. Absorbing photonic crystals for thin film photovoltaics

    E-print Network

    Daif, O El; Gomard, G; Meng, X; Kaminski, A; Fave, A; Lemiti, M; Caurel, E Garcia; Cabarrocas, P Roca i; Ahn, S; Jeon, H; Seassal, C; 10.1117/12.854035

    2010-01-01

    The absorption of thin hydrogenated amorphous silicon layers can be efficiently enhanced through a controlled periodic patterning. Light is trapped through coupling with photonic Bloch modes of the periodic structures, which act as an absorbing planar photonic crystal. We theoretically demonstrate this absorption enhancement through one or two dimensional patterning, and show the experimental feasibility through large area holographic patterning. Numerical simulations show over 50% absorption enhancement over the part of the solar spectrum comprised between 380 and 750nm. It is experimentally confirmed by optical measurements performed on planar photonic crystals fabricated by laser holography and reactive ion etching.

  17. Heat Transfer Performance of Absorber of Absorption Refrigerating Machine

    NASA Astrophysics Data System (ADS)

    Kunugi, Yoshifumi; Ouchi, Tomihisa; Usui, Sanpei; Fukuda, Tamio

    Experimental studies on heat transfer performance of absorber for lithium bromide-water absorption refrigerating machine are presented in this paper. Experimental apparatus for 35 kW evaporator and absorber, and outer grooved tubes are used. As a result, over-al1 coefficient of heat transmission of absorber has a maximum value, in the case of heat transfer area ratio of absorber to evaporator, is about 0.8. Heat transfer rate of absorber is increased by 60% by using the outer grooved tube compared with the plane surfaced tube.

  18. Determination of decay coefficients for combustors with acoustic absorbers

    NASA Technical Reports Server (NTRS)

    Mitchell, C. E.; Espander, W. R.; Baer, M. R.

    1972-01-01

    An analytical technique for the calculation of linear decay coefficients in combustors with acoustic absorbers is presented. Tuned circumferential slot acoustic absorbers were designed for the first three transverse modes of oscillation, and decay coefficients for these absorbers were found as a function of backing distance for seven different chamber configurations. The effectiveness of the absorbers for off-design values of the combustion response and acoustic mode is also investigated. Results indicate that for tuned absorbers the decay coefficient increases approximately as the cube of the backing distance. For most off-design situations the absorber still provides a damping effect. However, if an absorber designed for some higher mode of oscillation is used to damp lower mode oscillations, a driving effect is frequently found.

  19. 21 CFR 74.3106 - D&C Blue No. 6.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...for coloring plain or chromic collagen absorbable sutures for general surgical use...for coloring plain or chromic collagen absorbable sutures for ophthalmic surgical use...for coloring polydioxanone synthetic absorbable sutures for ophthalmic and general...

  20. Erbium concentration dependent absorbance in tellurite glass

    SciTech Connect

    Sazali, E. S., E-mail: mdsupar@utm; Rohani, M. S., E-mail: mdsupar@utm; Sahar, M. R., E-mail: mdsupar@utm; Arifin, R., E-mail: mdsupar@utm; Ghoshal, S. K., E-mail: mdsupar@utm; Hamzah, K., E-mail: mdsupar@utm [Advanced Optical Material Research Group, Department of Physics, Faculty of Science, Universiti Teknologi Malaysia, 81310, Skudai, Johor Bahru, Johor (Malaysia)

    2014-09-25

    Enhancing the optical absorption cross-section in topically important rare earth doped tellurite glasses is challenging for photonic devices. Controlled synthesis and detailed characterizations of the optical properties of these glasses are important for the optimization. The influence of varying concentration of Er{sup 3+} ions on the absorbance characteristics of lead tellurite glasses synthesized via melt-quenching technique are investigated. The UV-Vis absorption spectra exhibits six prominent peaks centered at 490, 526, 652, 800, 982 and 1520 nm ascribed to the transitions in erbium ion from the ground state to the excited states {sup 4}F{sub 7/2}, {sup 2}H{sub 11/2}, {sup 4}F{sub 9/2}, {sup 4}I{sub 9/2}, {sup 2}H{sub 11/2} and {sup 4}I{sub 13/2}, respectively. The results are analyzed by means of optical band gap E{sub g} and Urbach energy E{sub u}. The values of the energy band gap are found decreased from 2.82 to 2.51 eV and the Urbach energy increased from 0.15 to 0.24 eV with the increase of the Er{sub 2}O{sub 3} concentration from 0 to 1.5 mol%. The excellent absorbance of the prepared tellurite glasses makes them suitable for fabricating solid state lasers.

  1. Multiple-Path-Length Optical Absorbance Cell

    NASA Technical Reports Server (NTRS)

    2001-01-01

    An optical absorbance cell that offers a selection of multiple optical path lengths has been developed as part of a portable spectrometric instrument that measures absorption spectra of small samples of water and that costs less than does a conventional, non-portable laboratory spectrometer. The instrument is intended, more specifically, for use in studying colored dissolved organic matter (CDOM) in seawater, especially in coastal regions. Accurate characterization of CDOM is necessary for building bio-optical mathematical models of seawater. The multiple path lengths of the absorption cell afford a wide range of sensitivity needed for measuring the optical absorbances associated with the wide range of concentrations of CDOM observed in nature. The instrument operates in the wavelength range of 370 to 725 nm. The major subsystems of the instrument (see figure) include a color-balanced light source; the absorption cell; a peristaltic pump; a high-precision, low-noise fiber optic spectrometer; and a laptop or other personal computer. A fiber-optic cable transmits light from the source to the absorption cell. Other optical fibers transmit light from the absorption cell to the spectrometer,

  2. Wave energy extraction by coupled resonant absorbers.

    PubMed

    Evans, D V; Porter, R

    2012-01-28

    In this article, a range of problems and theories will be introduced that will build towards a new wave energy converter (WEC) concept, with the acronym 'ROTA' standing for resonant over-topping absorber. First, classical results for wave power absorption for WECs constrained to operate in a single degree of freedom will be reviewed and the role of resonance in their operation highlighted. Emphasis will then be placed on how the introduction of further resonances can improve power take-off characteristics by extending the range of frequencies over which the efficiency is close to a theoretical maximum. Methods for doing this in different types of WECs will be demonstrated. Coupled resonant absorbers achieve this by connecting a WEC device equipped with its own resonance (determined from a hydrodynamic analysis) to a new system having separate mass/spring/damper characteristics. It is shown that a coupled resonant effect can be realized by inserting a water tank into a WEC, and this idea forms the basis of the ROTA device. In essence, the idea is to exploit the coupling between the natural sloshing frequencies of the water in the internal tank and the natural resonance of a submerged buoyant circular cylinder device that is tethered to the sea floor, allowing a rotary motion about its axis of attachment. PMID:22184664

  3. Suture Closure versus Non-Closure of Subcutaneous Fat and Cosmetic Outcome after Cesarean Section: A Randomized Controlled Trial

    PubMed Central

    Husslein, Heinrich; Gutschi, Martina; Leipold, Heinz; Herbst, Christoph; Franz, Maximilian; Worda, Christof

    2014-01-01

    Introduction To investigate the effect of subcutaneous fat suture closure versus non-closure at cesarean section (CS) on long-term cosmetic outcome. Material and Methods Women undergoing planned or unplanned CS were randomized to either subcutaneous fat suture closure or non-closure using a 1?1 allocation algorithm. Participants and outcome assessors were blinded to group allocation. Scar evaluation was performed after two and six months. Primary outcome measures were Patient and Observer Scar Assessment Scale (POSAS) summary scores six months after surgery. Secondary outcome measures were Vancouver Scar Scale (VSS) summary scores, retraction of the scar below the level of the surrounding skin, duration of surgery, and development of hematoma, seroma, surgical site infection (SSI) or wound disruption. Data were analyzed according to the intention to treat principle. Results A total of 116 women were randomized and 91 participants, 47 in the closure and 44 in the non-closure group, completed the trial and were analyzed. There were no differences in patient morphometrics or surgery indications between groups. At two and six months no significant differences were found with respect to POSAS or VSS scores between groups. After two months significantly more women in the non-closure group described their scar as being retracted below the level of the skin (36% vs. 15%, p?=?0.02) whereas no difference was observed at six months. There were significantly more hematomas in the non-closure (25%) compared to the closure group (4%) (p?=?0.005). There was no difference in duration of surgery, SSI, seroma formation or wound disruption between groups. Conclusions Suture closure of the subcutaneous fat at CS does not affect long-term cosmetic outcome. (Level I evidence). Trial Registration ClinicalTrials.gov NCT01542346. PMID:25494177

  4. 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

    NASA Astrophysics Data System (ADS)

    Burnett, Cindy; Tate, Lloyd P.; Correa, Maria T.

    1992-06-01

    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 recovering from general anesthesia, were sedated the following day and were subjected to a transendoscopic neodymium: yttrium aluminum garnet (Nd:YAG) laser ablation of the left laryngeal ventricle. Ability to perform after treatment relative to before treatment, reduction or elimination of respiratory noise, owner or trainer satisfaction, were compared for the two suture prosthetic procedures using chi-squared test or Fisher's exact test. No statistical significant differences were found for performance, reduction of noise, and owner or trainer satisfaction. The use of one or two sutures seemed to have no effect on the effectiveness of prosthetic laryngoplasty procedure followed by Nd:YAG ventricular ablation.

  5. Airtightness of lung parenchyma without a closing suture after atypical resection using the Nd:YAG Laser LIMAX® 120

    PubMed Central

    Kirschbaum, Andreas; Steinfeldt, Thorsten; Gockel, Andreas; Di Fazio, Pietro; Quint, Karl; Bartsch, Detlef K.

    2014-01-01

    OBJECTIVES Lung metastases can be non-anatomically resected with a Nd:YAG Laser. It is recommended that the resected lung surface be sealed by slowly resorbable sutures. However, the lung tissue may be restricted by the sutures once it is re-ventilated. Thus, it was analysed whether the lung parenchyma is airtight after laser resection without suturing the defect. METHODS The pulmonary artery of unimpaired paracardial lung lobes of freshly slaughtered pigs (mean weight 46 g) was cannulated and rinsed out via a hypotonic saline–heparin solution (5000 IE) until the perfusate was clear of body fluid. The lobular bronchus was connected to an airtight ventilation tube (Fa. VYGON 520 3.5 oral tube) and ventilated pressure-controlled (PEEP + 5 cm H2O, P1 = 20 cm H2O, frequency = 10/min) via a respirator. All lobes were perfused with Ringer solution at 42°C at normothermia and normotonia. In group 1 (n = 8), an atypical peripheral parenchymal resection (average resected surface: 2 × 2 cm2) and in group 2 (n = 8), a deep atypical parenchymal resection (average resected surface: 4 × 4 cm2) were performed with the Nd:YAG Laser LIMAX® 120 (output power at 100 watts). After post-resection ventilation of 15 min, the resection surface was tested for airtightness and burst pressure. RESULTS All group 1 lobes tested airtight under pressure-controlled ventilation. The mean burst pressure was 34.4 mbar (SD ± 3.2 mbar). Six lobes of group 2 were also completely airtight. The remaining two lobes, however, revealed a serious parenchymal leak (score 3). This was caused by the cross-opening of a segmental bronchus, although the surrounding lung parenchyma was also airtight. The mean burst pressure of these lobes was 31.7 mbar (SD ± 4.08 mbar). There was no significant difference between the two groups (P = 0.12). CONCLUSIONS Peripheral lung defects after Nd:YAG Laser resection might not be sutured, since the laser-induced vaporization of the lung parenchyma seems to be initially airtight. These experimental data warrant confirmation in a controlled clinical study. PMID:24087831

  6. A Novel Technique for Ligamentum Teres Reconstruction With “All-Suture” Anchors in the Medial Acetabular Wall

    PubMed Central

    Mei-Dan, Omer; McConkey, Mark O.

    2014-01-01

    The function of the ligamentum teres remains poorly understood, but tears have been recognized as a source of hip pain. In some patients with complete ligamentum teres tears, symptoms of instability are described. Microinstability and excess motion are hypothesized to be a source of pain and mechanical symptoms. Efforts in recent years to improve symptoms have led to the development of techniques used to reconstruct the ligamentum teres, with some early evidence that reconstruction can improve symptoms in appropriately selected patients. We describe our technique for ligamentum teres allograft reconstruction using anchors made only of suture seated in the acetabular floor. PMID:24904763

  7. Lithospheric Deformation Along the Southern and Western Suture Zones of the Wyoming Province

    NASA Astrophysics Data System (ADS)

    Nuyen, C.; Porritt, R. W.; O'Driscoll, L.

    2014-12-01

    The Wyoming Province is an Archean craton that played an early role in the construction and growth of the North American continent. This region, which encompasses the majority of modern day Wyoming and southern Montana, initially collided with other Archean blocks in the Paleoproterozoic (2.0-1.8 Ga), creating the Canadian Shield. From 1.8-1.68 Ga, the Yavapai Province crashed into the Wyoming Province, suturing the two together. The accretion of the Yavapai Province gave way to the Cheyenne Belt, a deformational zone that exists along the southern border of the Wyoming Province where earlier studies have found evidence for crustal imbrication and double a Moho. Current deformation within the Wyoming province is due to its interaction with the Yellowstone Hotspot, which is currently located in the northwest portion of the region. This study images the LAB along the western and southern borders of the Wyoming Province in order to understand how the region's Archean lithosphere has responded to deformation over time. These results shed light on the inherent strength of Archean cratonic lithosphere in general. We employ two methods for this study: common conversion point (CCP) stacking of S to P receiver functions and teleseismic and ambient Rayleigh wave dispersion. The former is used to image the LAB structure while the latter is used to create a velocity gradient for the region. Results from both of the methods reveal a notably shallower LAB depth to the west of the boundary. The shallower LAB west of the Wyoming Province is interpreted to be a result of lithospheric thinning due to the region's interaction with the Yellowstone Hotspot and post-Laramide deformation and extension of the western United States. We interpret the deeper LAB east of the boundary to be evidence for the Wyoming Province's resistance to lithospheric deformation from the hotspot and tectonic processes. CCP images across the Cheyenne Belt also reveal a shallower LAB under the western perimeter of the belt. We believe that this is a result of the LAB jumping up to a mid-lithospheric discontinuity (MLD) as the less stable lower lithosphere was thinned or removed. This same MLD appears above the intact LAB in the eastern portion of the Cheyenne Belt. This suggests that the western end of the Cheyenne Belt has undergone more deformation over time than the eastern end.

  8. Boron Isotopes in Antigorite from the Guatemala Suture Zone Serpentinite Mélanges, Guatemala: Origin of the Serpentinite.

    NASA Astrophysics Data System (ADS)

    Martin, C.; Harlow, G. E.; Marschall, H.

    2014-12-01

    The Guatemala Suture Zone (GSZ) features two serpentinite mélanges straddling the Motagua Fault system. In both North and South Motagua Mélanges (NMM and SMM, respectively), blocks of high-pressure, low-temperature metabasites (e.g., eclogites) are embedded into a serpentinite matrix, together with vein-related rocks (e.g., jadeitites). The origin of serpentinite forming the matrix is still unclear. It is commonly believed to represent either the seafloor / oceanic mantle hydrated by infiltration of seawater or the forearc mantle wedge hydrated by fluid released during subduction. Nowadays, the few data available on serpentinites from Mariana forearc, abyssal peridotite or ophiolitic massifs show positive or slightly negative ?11B (-4.6 to +40‰), in support of the assumption of a shallow origin for the fluid. However, it has been suggested that serpentinites could form much deeper within a subduction channel (~ 30 km depth). In situ boron analyses on antigorite from serpentinites of the GSZ have been carried out by LA-MC-ICPMS and SIMS. Serpentine matrices have low to moderate B concentrations, between 2 and 15µg/g. They display somewhat negative isotopic values, with ?11B of -8.2 ± 2.8 and -11.9 ± 1.2‰ for samples from the NMM, and ?11B of -4.1 ± 3.0 and -11.1 ± 1.8‰ for a sample from the SMM. In addition, this sample contains a late antigorite vein showing a ?11B of -3.0 ± 3.5‰, and some veinlets with scattered values (?11B ranging from -12.5 ± 0.9 to -6.4 ± 1.4‰). This first suite of measurements carried out directly on serpentinites from serpentinite mélanges displays very negative values, which do not overlap with previously published data. It indicates that the ultramafic precursors of the serpentine from the GSZ Serpentinite Mélanges were not hydrated by seawater, or by fluid released during the early stages of subduction. Rather, these negative values indicate that the fluid responsible for the hydration of ultramafic rocks likely comes from deep stages of slab devolatilization, in agreement with the hypothesis of deep serpentinite formation in the subduction channel. Thus, the serpentinite matrix of the mélanges probably represents hydrated mantle wedge.

  9. Strength function under the absorbing boundary condition

    NASA Astrophysics Data System (ADS)

    Iwasaki, M.; Otani, R.; Ito, M.

    2014-12-01

    The strength function of the linear response by the external field is calculated in the formalism of the absorbing boundary condition (ABC). The dipole excitation of a schematic two-body system is treated in the present study. The extended completeness relation, which is assumed on the analogy of the formulation in the complex scaling method (CSM), is applied to the calculation of the strength function. The calculation of the strength function is successful in the present formalism and hence, the extended completeness relation seems to work well in the ABC formalism. The contributions from the resonance and the non-resonant continuum is also analyzed according to the decomposition of the energy levels in the extended completeness relation.

  10. Porous Carbon Nanoparticle Networks with Tunable Absorbability

    PubMed Central

    Dai, Wei; Kim, Seong Jin; Seong, Won-Kyeong; Kim, Sang Hoon; Lee, Kwang-Ryeol; Kim, Ho-Young; Moon, Myoung-Woon

    2013-01-01

    Porous carbon materials with high specific surface areas and superhydrophobicity have attracted much research interest due to their potential application in the areas of water filtration, water/oil separation, and oil-spill cleanup. Most reported superhydrophobic porous carbon materials are fabricated by complex processes involving the use of catalysts and high temperatures but with low throughput. Here, we present a facile single-step method for fabricating porous carbon nanoparticle (CNP) networks with selective absorbability for water and oils via the glow discharge of hydrocarbon plasma without a catalyst at room temperature. Porous CNP networks were grown by the continuous deposition of CNPs at a relatively high deposition pressure. By varying the fluorine content, the porous CNP networks exhibited tunable repellence against liquids with various degrees of surface tension. These porous CNP networks could be applied for the separation of not only water/oil mixtures but also mixtures of liquids with different surface tension levels. PMID:23982181

  11. Skin interaction with absorbent hygiene products.

    PubMed

    Runeman, Bo

    2008-01-01

    Skin problems due to the use of absorbent hygiene products, such as diapers, incontinence pads, and feminine sanitary articles, are mostly due to climate or chafing discomfort. If these conditions are allowed to prevail, these may develop into an irritant contact dermatitis and eventually superficial skin infections. Skin humidity and aging skin are among the most significant predisposing and aggravating factors for dermatitis development. Improved product design features are believed to explain the decline in observed diaper dermatitis among infants. Where adult incontinence-related skin problems are concerned, it is very important to apply a holistic perspective to understand the influences due to the individual's incontinence level and skin condition, as well as the hygiene and skin care measures provided. Individuals with frail, sensitive skin or with skin diseases may preferably have to use high-quality products, equipped with superabsorbent polymers and water vapor-permeable back sheets, to minimize the risk of skin complications. PMID:18280904

  12. 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.

    NASA Astrophysics Data System (ADS)

    Kuzmichev, A.; Bogdanov, N.

    2003-04-01

    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 popular is the hypothesis of rotational opening of this basin. In accord with this hypothesis, the South Anuj suture must at some point meet the strike-slip global-scale transform trending along the eastern foot of the Lomonosov Ridge. The geometric contradictions arising from rotational hypothesis have been discussed by [Rowley and Lottes, 1988; Lane, 1997]. To avoid them, [Rowley and Lottes, 1988] suggest that the South Anuj suture does not reach Bigger Lykhov Is. but ends up in the vicinity of the Kolyma river mouth and meets the transform there. In fact, the suture's westward tracing is based only on geophysical data. The earlier published data on the rocks exposed on the Bigger Lyakhov island have permitted to assume that these rocks had nothing in comman with those in the South Anuj region. Our 2000 fieldwork on the Bigger Lyakhov Isl. was aimed to verify this assumption. The results have shown that all rock complexes exposed on the island are analogous to those in the South Anuj area - tectonotype of the suture. This confirmed the first assumption of the suture's trend. However, the question was still unsettled where the suture further goes to from the island and were it joins the transform. It is generally accepted that the suture turns northwards from the B.Lyakhov Is. to Zemlya Bunge or Kotel'ny Ils [Spector et al., 1981; Parfenov et al., 1999; Fujita et al., 1997]. We can not agree with this idea since the Jurassic rocks on these islands are undeformed and even unlithified. So, if the suture has a NW continuation, it must lie W-SW of Belkovsky Island and meet the transform nearby. This was the reason to explore if such large-scale tectonic features as the transform and suture were somehow manifested in the structure of Belkovsky Island. The prelilminary results of the 2002 fieldwork are as follows: 1) The Devonian-Carboniferous deposits of the Bel'kovsky Is. were folded due to SW-NE compression and were stronger deformed in Neocomian as compared to those on Kotel'ny Is. This suggests the suture to lie SW of the Bel'kovsky Is. 2) A large-scale meridional dextral strike-slip fault was mapped on the Bel'kovsky Isl., which could be interpreted as a satellite of a global transform. These observations may be treated as a confirmation of rotational model of the Amerasian basin opening. But instead of reducing geometric inconsistencies arising from the plain rotational model, our results increased them. We intend to suggest another way to solve this problem in our next report at ICAM IV in Canada.

  13. [Alternatives for closure of the rectal "stump" in Hartmann's operation. A comparative experimental study which includes the resorbable mechanical suture (polysorb)].

    PubMed

    Martini, R B; Amuchástegui, R; Gil, O A; Ribichini, J J; Traverso, R; Cordero, F; López, D

    1992-01-01

    Five different kinds of sutures which can be used for closure of the rectal stump in Hartmann's operation are evaluated in the same animal. They are compared at six different phases of the cicatrization process: 7-30-45-60-90 and 150 days. In the analysis, the degree of complete cicatrization is considered as well as the thickness of the cicatriced tissue, and other factors such as persistence of suture material and the result of it. All of the sutures involved accomplished the goal of a good joint of the planes of intestinal suture. Although, two of them, the metal stapler and Polyglactin (Vicryl) in extramucosal surgery fulfill almost in an ideal way the goals concerning security, rare reaction to suture material, and consequently less thickness in the cicatriced tissue (2 x 2 and 1 x 1 mm respectively) as well as complete cicatrization in ninety days. Stapler is performed quicker and in a more aseptic way, but the scar resulting from Polyglactin is smaller. In separate extramucosal points, silk produces a more important tissue reaction with a thicker scar (3 x 3 mm) coming to an end in 150 days. "Albert Lembert" type suture is really far away from being a good mean because it creates an important tissue reaction with a thick scar (3 x 3 mm), with late consolidation (150 days) and granulomatous reaction. Resorbable stapler--Polisorb--has a considerable volume and it causes an important tissue reaction which determines a very thick (4.5 x 4.5 mm) and "unfinished" scar within 150 days; really far away for practical use. PMID:1344182

  14. An acoustic absorber implemented by graded index phononic crystals

    NASA Astrophysics Data System (ADS)

    Liang, Yu-Jui; Chen, Lien-Wen; Wang, Ching-Cheng; Chang, I.-Ling

    2014-06-01

    In this paper, we proposed the implementation of a two-dimensional omnidirectional and broadband acoustic absorber using graded index phononic crystals as the shell with an inner absorbing core. The phononic crystal was consisted of circular steel rod arranged as square lattice in air background. The plane wave expansion method was used to obtain the band diagram of the phononic crystal from which the effective refractive index could be computed. The radially distributed refractive index of the acoustic absorber was achieved by placing steel rods with spatially varying radii. The finite element method was employed in order to confirm the acoustic properties of the designed device. Numerical simulations illustrated that the acoustic waves were bent toward the central area by the outer shell and absorbed by the inner core of the implemented acoustic absorber. Furthermore, it was demonstrated that the implemented acoustic absorber could operate independent of the incident wave directions for a relative wide range of frequencies.

  15. Nonabsorbable suture granuloma mimicking ovarian cancer recurrence at combined positron emission tomography/computed tomography evaluation: a case report

    PubMed Central

    2014-01-01

    Introduction This is the first case of suture granuloma mimicking isolated ovarian cancer relapse. Only six analogous cases have been previously reported in other malignancies. Case presentation We report the case of a 44-year-old Caucasian woman with partially platinum-sensitive ovarian cancer in which radiological features, including computed tomography and combined 18F-fluorodeoxyglucose-positron emission tomography/computed tomography, were strongly suggestive of isolated cancer relapse in her right subdiaphragmatic region. Laparoscopic examination resulted negative, but was not completely suitable due to widespread adhesive syndrome. The laparotomy for secondary cytoreductive surgery and biopsy of the suspected area showed inflammatory granuloma caused by nonabsorbable propylene suture, without evidence of neoplastic cells. Moreover, unexpected peritoneal carcinosis was found. Conclusions This evidence suggests that clinical details about previous surgical procedures are necessary for adequate interpretation. Although much progress has been made in imaging techniques, especially in the promising field of combined 18F-fluorodeoxyglucose positron emission tomography/computed tomography, these procedures should be still thoroughly investigated in order to promptly rule out tumor recurrence and avoid unnecessary surgery. PMID:24942653

  16. Infrared perfect absorber and its application as plasmonic sensor.

    PubMed

    Liu, Na; Mesch, Martin; Weiss, Thomas; Hentschel, Mario; Giessen, Harald

    2010-07-14

    We experimentally demonstrate a perfect plasmonic absorber at lambda = 1.6 microm. Its polarization-independent absorbance is 99% at normal incidence and remains very high over a wide angular range of incidence around +/-80 degrees. We introduce a novel concept to utilize this perfect absorber as plasmonic sensor for refractive index sensing. This sensing strategy offers great potential to maintain the performance of localized surface plasmon sensors even in nonlaboratory environments due to its simple and robust measurement scheme. PMID:20560590

  17. Reflectivity of commercial absorbers at 100-200 GHz

    Microsoft Academic Search

    A. Lehto; J. Tuovinen; A. Raisanen

    1991-01-01

    Different types (pyramidal, convoluted, wedge, flat) of absorber panels made by three manufacturers have been measured at 107 and 183 GHz. These measurements revealed a rapid degradation of the quality of absorbers from 107 to 183 GHz: reflectivity increased nearly 10 dB. The best absorbers have reflectivities below -40 dB at 107 GHz and about -35 dB at 183 GHz.

  18. Reflectivity of absorbers in 100-200 GHz range

    Microsoft Academic Search

    A. Lehto; J. Tuovinen; A. Raisanen

    1991-01-01

    Different types (pyramidal, convoluted, wedge, flat) of absorber panel made by several manufacturers have been measured at 107 and 183 GHz. These measurements revealed a rapid degradation of the quality of absorbers from 107 to 183 GHz: reflectivity increased nearly 10 dB. The best absorbers have reflectivities below -40 dB at 107 GHz and about -35 dB at 183 GHz.

  19. Study on mechanical properties of high-temperature absorbing coats

    Microsoft Academic Search

    Dongmei Zhu; Fa Luo; Liangming Xiong; Wancheng Zhou

    2007-01-01

    SiCN nano-powder, a good high-temperature absorber, was introduced as the absorber into the BaO–La2O3–B2O3 glass to prepare the high-temperature absorbing coats on the Ti-based alloy substrates. The difference of thermal expansion coefficient between the glass and Ti-alloy was determined through thermal mechanical analysis (TMA) and the wet ability of the glass to the substrate was explored. The mechanical properties including

  20. Vertical-plane pendulum absorbers for minimizing helicopter vibratory loads

    NASA Technical Reports Server (NTRS)

    Amer, K. B.; Neff, J. R.

    1974-01-01

    The use of pendulum dynamic absorbers mounted on the blade root and operating in the vertical plane to minimize helicopter vibratory loads was discussed. A qualitative description was given of the concept of the dynamic absorbers and some results of analytical studies showing the degree of reduction in vibratory loads attainable are presented. Operational experience of vertical plane dynamic absorbers on the OH-6A helicopter is also discussed.