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Monocryl® suture, a new ultra-pliable absorbable monofilament suture  

Microsoft Academic Search

Synthetic absorbable sutures are available as braided constructions or as monofilaments. Braided absorbable sutures are made either from 90:10 poly(glycolide-co-l(?)-lactide), sold by Ethicon, Inc. under the trade name Vicryl®, or from polyglycolide, as sold, for instance, by Davis and Geck under the trade name Dexon®. There are, however, some concerns with braided sutures that relate to tissue drag and the

Rao S. Bezwada; Dennis D. Jamiolkowski; In-Young Lee; Vishvaroop Agarwal; Joseph Persivale; Susan Trenka-Benthin; Modesto Erneta; Jogendra Suryadevara; Alan Yang; Sylvia Liu



Running closure of clean and contaminated abdominal wounds using a synthetic monofilament absorbable looped suture  

Microsoft Academic Search

The effectiveness of using an absorbable suture material for continuous closure of abdominal wounds, especially contaminated\\u000a wounds, has not yet been determined. Thus, the present study was conducted to investigate the wound complications that developed\\u000a following continuous closure of clean and contaminated abdominal wounds using polydioxanone (PDS), compared with those that\\u000a developed following interrupted closure using braided silk. Running closure

Kazuhiro Iwase; Jun Higaki; Yasushi Tanaka; Haruhiko Kondoh; Masato Yoshikawa; Wataru Kamiike



[Tendon sutures with a new monofilament synthetic absorbable suture material (PDS-suture of 6-0 strength). Results of animal experiments].  


The absorbable synthetic suture (PDS suture 6-0 with spatula needle) was examined by experiments on the tendon of the M. flexor digitorum pedis communis of the hare. A total of 34 tendon sutures was prepared histologically and evaluated. The new suture material is distinguished by greatly extended absorption time, low foreign body reaction and an improved tensile strength. With this suture, the conditions in which absorbable suture material can be used are increased. This is particularly true of so-called bradytrophic tissue. PMID:6802585

Albers, W; Geldmacher, J; Giedl, H; Beyer, W



An In Vivo Comparison of Barbed Suture Devices and Conventional Monofilament Sutures for Cosmetic Skin Closure: Biomechanical Wound Strength and Histology  

Microsoft Academic Search

Background: Very little biomechanical or histological data exist in the peer-reviewed literature comparing absorbable monofilament sutures to commercially-available knotless, absorbable barbed suture devices for cosmetic closure of skin incisions.Objectives: The authors compare two commercially-available knotless, barbed suture devices against a conventional monofilament suture in a porcine model for biomechanical wound strength and histological quality of healing.Methods: This prospective randomized trial

Jeffrey Zaruby; Kristen Gingras; Jack Taylor; Don Maul



Optimizing arthroscopic knots using braided or monofilament suture  

Microsoft Academic Search

Surgeons need to know how the material properties of a suture affect the security of a surgical knot. The purpose of this study was to compare the security of some clinically important arthroscopic knots when tied using a braided multifilament suture and to draw comparisons with results of similar knots tied with monofilament suture. Permanent braided polyester suture was used

TD Loutzenheiser; DT Harryman; DW Ziegler; SW Yung



Comparative study of knot performance and ease of manipulation of monofilament and braided sutures for arthroscopic applications  

Microsoft Academic Search

Our aim was to identify alternative suture materials that might provide superior knot performance and equivalent ease of manipulation by means of an in vitro experimental study. Although used widely for arthroscopic shoulder stabilisation, absorbable poly( p-dioxanone) (PDS) monofilament sutures can lead to dehiscence and clinical failure due to knot slippage and\\/or loop elongation at low applied loads. With the

Xiaoli Li; Martin King; Peter MacDonald



Prolene monofilament suture in Boston Keratoprosthesis surgery  

PubMed Central

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

Kyrillos,, Ralph; Harissi-Dagher, Mona



Why make monofilament sutures out of polyvinylidene fluoride?  


In recent years some clinical reports have associated suture failures with polypropylene monofilaments. Therefore there is interest in developing an alternative suture material that is less thrombogenic than polyester and similar in handling characteristics but less prone to mechanical failure than polypropylene. To this end, Peters Laboratoire Pharmaceutique has developed a new monofilament suture material from polyvinylidene fluoride (PVDF), which has been subjected to a special treatment to modify its crystalline form and level of crystallinity. The purpose of this study was to evaluate its mechanical, chemical, and biologic properties and to compare its performance, in a peripheral vascular application, to that of a polypropylene control. A series of in vitro tests were performed to study the morphology, tensile properties, creep, surface chemistry, thermal characteristics, and resistance to iatrogenic trauma. In addition, an in vivo trial was undertaken in which vascular prostheses anastomosed with either PVDF or polypropylene sutures were implanted as a thoracoabdominal bypass for 6 months in the dog. Histologic and degradation analyses were performed on the explants. The results from the mechanical tests on 4-0, 5-0, and 6-0 PVDF and polypropylene sutures demonstrated that although both materials have similar breaking strengths, the PVDF has a higher extension at break, has less delayed extension when under tensile creep testing, and suffers less trauma than the polypropylene when compressed by a standard needle holder. While chemical analyses found evidence of surface oxidation on both types of sutures, thermal analysis confirmed that the level of crystallinity of the PVDF polymer is higher than that of the polypropylene control. During the pilot study in animals, PVDF sutures were found to have good handling and frictional characteristics that facilitated the tying of knots. Histologic analysis of the explants found no inflammatory cells in the tissue surrounding either the PVDF or polypropylene sutures, and scanning electron microscopic examination of the cleaned suture surfaces found no evidence of degradation during 6 months in vivo. Though preliminary in nature, these findings indicate that monofilament sutures made from PVDF provide an attractive alternative to those made from polypropylene for use in cardiovascular surgery. In addition to providing acceptable in vivo behavior and being easy to manipulate and more resistant to iatrogenic injury, PVDF materials can be sterilized by beta or gamma radiation and so can reduce dependence upon ethylene oxide and chlorofluorohydrocarbons. PMID:8003751

Urban, E; King, M W; Guidoin, R; Laroche, G; Marois, Y; Martin, L; Cardou, A; Douville, Y


Development of in vitro performance tests and evaluation of nonabsorbable monofilament sutures for cardiovascular surgery.  


There have been reports suggesting that polypropylene (PP) monofilament sutures are associated with mechanical failure. To overcome this problem, a new monofilament suture made from polyvinylidene fluoride, under the trade name of Teflene, has been developed. Few studies have measured the in vitro properties of Teflene sutures, and those that have, have been limited to a few tensile properties of the straight suture such as tensile strength, elongation, and creep behavior. The in vitro performance properties of Teflene sutures were evaluated and compared with those of commercial sutures made from PP such as Prolene and Surgilene in four sizes, 2-0, 3-0, 4-0, and 5-0. The performance properties of sutures included both the physical properties of straight sutures, such as suture diameter, tensile strength, elongation, surface roughness, coefficient of friction, bending stiffness, and tissue drag, and the knot characteristics, such as knot pull strength, knot run-down, and knot security. Existing standard test methods and testing instruments were used if available to measure certain suture properties such as diameter, tensile strength, knot pull strength, and some physical properties. The other novel test methods and unique accessory devices needed to perform the tests for measuring tissue drag, knot run-down, coefficient of friction, and knot security were developed in the authors' laboratories, and the comparative results are reported for the first time. From the test results, Teflene sutures were found in general to possess equivalent characteristics to those of existing PP commercial sutures, but some differences also were observed, such as greater elongation and less knot run-down. These differences may give them a unique feel and handling performance, especially in terms of making a knot, sliding it into position, and causing less damage to adjacent tissue. PMID:9831085

Hong, T; King, M W; Michielsen, S; Cheung, L W; Mary, C; Guzman, R; Guidoin, R


Comparison of the holding capacity of round monofilament, round multifilament, and flat multifilament nitinol suture loops in human cadaveric flexor tendon.  


Tendon repairs done with strong suture materials fail by suture pull out. To avoid pull out, suture loop needs to have a strong grip on the tendon. The aim of this study was to determine whether a single suture loop has a better grip of the tendon when multifilament or flat sutures are used compared with a conventional monofilament round suture. A cross-locking or simple grasping suture loop was placed into the distal end of a human cadaveric tendon using nitinol wire sutures in the following configurations: round monofilament (200 µm), round multifilament (4 × 100 µm), and flat multifilament (4 × 30 µm × 445 µm). The mean pull-out strength of the round multifilament (49.4 N) and flat multifilament sutures (50.7 N) were significantly higher than that of the round monofilament nitinol suture (36.5 N) when a locking loop was used. Suture grip can be improved by using a multifilament suture and a locking type of suture configuration. PMID:22117009

Karjalainen, T; He, M; Chong, A K S; Lim, A Y T; Göransson, H; Ryhänen, J



Comparison of mechanical properties of polyvinylidene fluoride and polypropylene monofilament sutures used for flexor tendon repair.  


We performed an experimental study to evaluate the mechanical properties of polyvinylidene fluoride sutures and to compare their use with that of standard polypropylene sutures for the circumferential, epitendinous suture of a flexor tendon repair. Polyvinylidene fluoride sutures had a smaller suture diameter, a greater knot pull strength and less delayed extension when under creep testing, than polypropylene sutures. Tendons repaired using polyvinylidene fluoride sutures had significantly greater gap and breaking strengths than those repaired using polypropylene sutures. PMID:11386769

Wada, A; Kubota, H; Hatanaka, H; Miura, H; Iwamoto, Y



Flexor Tenorrhaphy Using Absorbable Suture Materials  

PubMed Central

Background Nonabsorbable sutures are favorable for repairing flexor tendons. However, absorbable sutures have performed favorably in an animal model. Methods Two-strand sutures using the interlocking modified Kessler method with polydioxanone absorbable sutures 4-0 were used to repair completely ruptured flexor tendons in 55 fingers from 41 consecutive patients. The medical records of average 42 follow up weeks were analyzed retrospectively. The data analyzed using the chi-squared test, and Fisher's exact test was used for postoperative complications. The results were compared with those of other studies. Results Among the index, middle, ring, and little fingers were injured in 9, 17, 16, and 13 fingers, respectively. The injury levels varied from zone 1 to 5. Of the 55 digits in our study, there were 26 (47%) isolated flexor digitorum profundus (FDP) injuries and 29 (53%) combined FDP and with flexor digitorum superficialis injuries. Pulley repair was also conducted. Concomitant injuries of blood vessels and nerves were found in 17 patients (23 fingers); nerve injuries occurred in 5 patients (10 fingers). Two patients had ruptures (3.6%), and one patient had two adhesions (3.6%). Using the original Strickland criteria, all the patients were assessed to be excellent or good. Also, fibrosis and long-term foreign body tissue reactions such as stitch granuloma were less likely occurred in our study. Compared to the Cullen's report that used nonabsorbable sutures, there was no significant difference in the rupture or adhesion rates. Conclusions Therefore, this study suggests that appropriate absorbable core sutures can be used safely for flexor tendon repairs.

Kang, Hyung Joo; Kim, Jin Soo; Ki, Sae Hwi; Roh, Si Young; Yang, Jae Won



21 CFR 878.4830 - Absorbable surgical gut suture.  

Code of Federal Regulations, 2013 CFR

...2013-04-01 2013-04-01 false Absorbable surgical gut suture. 878.4830 Section 878...DEVICES GENERAL AND PLASTIC SURGERY DEVICES Surgical Devices § 878.4830 Absorbable surgical gut suture. (a) Identification....



21 CFR 878.4840 - Absorbable polydioxanone surgical suture.  

Code of Federal Regulations, 2013 CFR

...2013-04-01 false Absorbable polydioxanone surgical suture. 878.4840 Section 878... GENERAL AND PLASTIC SURGERY DEVICES Surgical Devices § 878.4840 Absorbable polydioxanone surgical suture. (a) Identification....



Biomechanical performance of a braided absorbable suture.  


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

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



Quill barbed sutures in body contouring surgery: a 6-year comparison with running absorbable braided sutures.  


Background: Body contouring operations are concluded with suture closure of long incisions under tension. While an expeditious and secure repair without complications is the objective, wound closure typically consumes a substantial percentage of the operative time and too often leads to delayed wound healing and other problems. Objectives: The authors evaluate suture-line wound healing for body contouring operations with barbed suture wound closure compared with absorbable running suture closure. Methods: In this retrospective study, wound-healing complications for a 228 consecutive-patient cohort with barbed sutures over a period of 4 years were compared with those for a prior 132 consecutive-patient cohort with absorbable running sutures over a period of 2 years. Complications were classified according to severity: grade 1 (mild), grade 2 (moderate), and grade 3 (severe). The preferred suture techniques for the closure of either thick or thin subcutaneous tissue under tension are described. The authors' clinical impressions are also presented. Results: Patients whose wounds were closed with absorbable running sutures had a significantly greater incidence of complications at all severity grades of severity than did those with barbed suture closures, with the exception of grade 3 (severe) complications in thighplasty. Logistical regression was <1, and the confidence interval was also <1, in support of these results. Conclusions: Proper barbed suture selection and 2-layer technique led to a statistically significant lower rate of wound-healing complications as compared with prior experience with traditional running braided absorbable sutures. Other benefits were more rapid speed of closure, adequate security of the wound closure, and increased surgeon satisfaction. Level of Evidence: 3. PMID:24084879

Hurwitz, Dennis J; Reuben, Brian



Skin closure in vascular neurosurgery: A prospective study on absorbable intradermal suture versus nonabsorbable suture  

PubMed Central

Background: The craniotomy performed with minimal hair removal and closure with intradermal suture alone is an option in neurosurgical procedures, which can help faster psychological recovery of the patient, as it allows a better cosmetic result. This study is aimed at evaluating if such method is safe and effective, compared with continuous skin sutures with 2-0 nylon. Methods: We analyzed the sutures in 117 patients undergoing craniotomies for cerebral aneurysm clipping. In the case group (n = 49), closure of the scalp was performed only with intradermal absorbable sutures using wire Monocryl® 2-0. In the control group (n = 68), closure was performed with continuous suture using 2-0 nylon. Results: The case group was composed of 49 patients in whom just intradermal suture was performed. One (2.2%) patient developed wound infection and was given proper medical treatment. No cases of dehiscence or cerebrospinal fluid leaks were observed. The control group was composed of 68 patients in whom the skin was closed with 2-0 nylon continuous suture. Three (5.3%) patients developed wound infection and were given proper medical treatment. There were no cases of wound dehiscence. The overall infection rate in the control group was 4%. There was no statistically significant difference in the number of wound infections between the two groups (P = 0.73). Conclusion: The closure with intradermal suture alone in craniotomies is as safe as the traditional skin closure with nylon sutures, besides eliminating the need for suture removal and providing a cosmetic advantage.

Pereira, Julio Leonardo Barbosa; Vieira, Gerival; de Albuquerque, Lucas Alverne Freitas; Mendes, George de Albuquerque Cavalcanti; Salles, Ludmila Rezende; de Souza, Andre Felipe Ferreira; Dellaretti, Marcos; de Sousa, Atos Alves



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

Code of Federal Regulations, 2013 CFR

...Absorbable poly(glycolide/l-lactide) surgical suture. 878.4493 Section 878...GENERAL AND PLASTIC SURGERY DEVICES Surgical Devices § 878.4493 Absorbable poly(glycolide/l -lactide) surgical suture. (a)...



A ganglion cyst generated by non-absorbable meniscal repair suture material.  


Arthroscopic meniscal repair has been a common procedure for the treatment of a torn meniscus, since the importance of meniscal preservation is widely understood. Over the years, the complications associated with suture material have been reported. Meniscal cyst is also one of those things. But ganglion cyst triggered by non-absorbable suture material was not documented in the literature. We report the case of a 19-year-old boy who underwent arthroscopic ACL reconstruction and repair of the medial meniscus by inside-out technique using 2-0 non-absorbable polyester sutures. The patient returned to our clinic at 4-year F/U with right knee pain due to medial meniscus tear and ganglion cyst. We suspect non-absorbable suture materials itself might have caused soft tissue irritation with repetitive trauma that lead to mucoid degeneration which results in ganglion cyst formation in the end. PMID:22858108

Kang, H J; Chun, C H; Kim, S H; Kim, K M



Evaluation of tensile strength of surgical synthetic absorbable suture materials: an in vitro study  

PubMed Central

Purpose The purpose of this study was to evaluate the tensile strength of surgical synthetic absorbable sutures over a period of 14 days under simulated oral conditions. Methods Three suture materials (polyglycolic acid [PGA], polyglactin [PG] 910, and poly (glycolide-co-?-caprolactone) [PGC]) were used in 4-0 and 5-0 gauges. 210 suture samples (35 of each material and gauge) were used. All of the samples were tested preimmersion and 1 hour and 1, 3, 7, 10, and 14 days postimmersion. The tensile strength of each suture material and gauge was assessed. The point of breakage and the resorption pattern of the sutures were also assessed. Results During the first 24 hours of immersion, all 4-0 and 5-0 samples of PGA, PG 910, and PGC maintained their initial tensile strength. At baseline (preimmersion), there was a statistically significant (P<0.001) difference in the tensile strengths between the 4-0 and 5-0 gauge of PGA, PG 910, and PGC. PGA 4-0 showed the highest tensile strength until day 10. At 7 days, all the 4-0 sutures of the three materials had maintained their tensile strength with PGA 4-0 having significantly greater (P=0.003) tensile strength compared to PG. Conclusions 4-0 sutures are stronger and have greater tensile strength than 5-0 sutures. The PGA 4-0 suture showed the highest tensile strength at the end of day 10.

Ranganath, V.; Nichani, Ashish Sham



Use of Absorbable Sutures in Canine Carotid Arteries  

PubMed Central

To study the functional and microstructural characteristics of polydioxanone sutures in vascular surgery, we created 48 vascular anastomoses in the right and left common carotid arteries of 24 mongrel dogs. In each animal, polydioxanone sutures were used in 1 carotid artery, and polypropylene sutures were used in the contralateral carotid artery. Twelve groups of 2 animals each were then formed. The 1st group was observed for 1 month, the 2nd for 2 months, the 3rd for 3 months, and so on until the 12th group, which was observed for 12 months. At the end of each observation period, reoperation was undertaken to evaluate the vascular anastomoses by means of angiography and microscopy. The polypropylene anastomoses showed a marked deformity, with tissue retraction and a foreign body reaction. In contrast, the polydioxanone anastomoses exhibited satisfactory healing, without deformity, and were well tolerated histologically. We believe that polydioxanone may be a useful, alternative vascular suture material. (Texas Heart Institute Journal 1990;17:99-102) Images

Rey, Alejandro R.; Carrillo-Farga, Joaquin; Velasco, Carlos O.; Valencia, Martin O.V.



Chronic sinus formation using non absorbable braided suture following open repair of Achilles tendon.  


This study reports a case of a 34 year old man who sustained an Achilles tendon rupture which was surgically repaired using a non-absorbable suture that was complicated by a deep sinus and chronic infection. Despite antibiotics, surgical debridement and skin grafting, his condition did not resolve. Further imaging revealed a sinus leading to the core suture knot that was eccentrically placed but not buried within the healed tendon repair, and the offending suture was subsequently removed. This case highlights the importance of meticulous surgical technique when performing Achilles tendon repair and a high index of suspicion for early imaging when patients present with chronic wound infection post-operatively. The authors urge surgeons to use routinely use an absorbable non-braided suture, which remains buried within the core when performing Achilles tendon repair. PMID:23548461

Ahluwalia, Raju; Zourelidis, Charalambos; Guo, Shigong; Dega, Raman



Usefulness of Absorbable Sutures in Preventing Surgical Site Infection in Hepatectomy  

Microsoft Academic Search

We evaluated the usefulness of synthetic absorbable sutures (Vicryl) in preventing surgical site infection (SSI) after hepatectomy.\\u000a A rat model of 60% partial hepatectomy was used. Bleeding from the cut surface of the liver was controlled by using two suture\\u000a types: silk and Vicryl. In the Vicryl group, the lesser omentum was slightly adherent to the cut surface of the

Shinji Togo; Toru Kubota; Takuji Takahashi; Kenichi Yoshida; Kenichi Matsuo; Daisuke Morioka; Kuniya Tanaka; Hiroshi Shimada



The influence of suture material on the strength of horizontal mattress suture configuration for meniscus repair.  


PURPOSE: Comparison of the mechanical characteristics of meniscal repair fixation using horizontal sutures and six different sutures under submaximal cyclic and load to failure test conditions may aid physicians in selecting a suture type. METHODS: A 2-cm long anteroposterior vertical longitudinal incision was created in six groups of bovine medial menisci. Lesions were repaired using a No. 2 suture either composed of polyester or polyester and ultra high-molecular weight polyethylene (UHMWPE), or UHMWPE and polydioxanone or pure UHMWPE. Endpoints included ultimate failure load (N), pull-out stiffness (N/mm), pull-out displacement (mm), cyclic displacement (mm) after 100cycles, after 500cycles, and mode of failure. RESULTS: Polyester suture had lower ultimate load than all groups except the suture composed of polyester and UHMWPE (P<.05). Pure UHMWPE suture had higher ultimate failure load than sutures composed of either polyester or polyester plus UHMWPE (P<.05). Predominant failure mode was suture cutting through the meniscus for the groups except for polyester suture which failed by suture rupture. CONCLUSION: Under cyclic loading conditions in bovine meniscus, braided polyester suture fixation provided lower initial fixation strength than fixation with various high strength sutures composed of pure UHMWPE or a combination of absorbable monofilament polydioxanone and UHMWPE, except for combination of polyester and UHMWPE sutures. CLINICAL RELEVANCE: Present study does not support the usage of the braided polyester sutures instead of high strength sutures composed either partially or totally of ultra-high molecular weight polyethylene for the horizontal suture configuration of meniscus repair. PMID:23340094

Hapa, Onur; Ak?ahin, Ertu?rul; Erduran, Mehmet; Davul, Serkan; Havitçio?lu, Hasan; Laprade, Robert F; Bozda?, Ergun; Sünbülo?lu, Emin



[Reaction of the fibrose eyeball covering upon the suture material synthetic and absorbable "Dexon". (Experimental study) (author's transl)].  


The present paper deals with the results of 20 eyes of experimentally operated laboratory animals, whose perforating wounds (of cornea and those of sclerocorneal region) have been suturated with a new type of absorbable synthetic suture material "Dexon" thickness being 6-0. The synthetic absorbable suture material "Dexon" is made of polyglycol acid, and it has been introduced to market by the firm Davis and Geck (U.S.A.). The inflammatory tissue reaction to the presence of the suture material "Dexon" is prominent and can by compared to the reaction to chromic resorbable suture materials (catgut or collagen). The suture material "Dexon" start to resorb in the course of the 2nd-3rd weeks after operation. The suture material "Dexon" can be used at an advantage in the operation where it is possible to cover the knots by a conjuctival lobe (in sclerocorneal region or in strabismus surgery) in this way the tendency to overgrowing of epithelial cells along the suture channels can be prevented. The "Dexon" material is sufficiently flexible and firm and has no antigenic properties, therefore it appears very prospective for ophthalmosurgery. PMID:231422

Olah, Z



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

Code of Federal Regulations, 2013 CFR

...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...



A Randomized, Controlled Trial Comparing Long-term Cosmetic Outcomes of Traumatic Pediatric Lacerations Repaired with Absorbable Plain Gut versus Nonabsorbable Nylon Sutures  

Microsoft Academic Search

Objectives: To show that the use of absorbable sutures in pediatric traumatic lacerations affords good long-term cosmesis and no increase in complications (infection, de- hiscence rates, and need for surgical scar revision) when compared with wounds sutured with nonabsorbable su- tures. Methods: This was a randomized clinical trial conducted in a pediatric emergency department. Patients 1-18 years of age who

Helen Karounis; Serge Gouin; Harley Eisman; Dominic Chalut; Helene Pelletier; Bruce Williams



"Growth factor" technique using expanded polytetrafluoroethylene monofilament for arteriovenous fistulae.  


We employed the "growth factor" technique first described by Starzl et al. to construct 12 consecutive end-to-end arteriovenous wrist fistulas (AVWF) for chronic hemodialysis, using expanded polytetrafluoroethylene (ePTFE) monofilament (Gore-Tex) as the suture material. A complete migration of the "growth factor" loop through the vessel walls was observed and immediate patency of the AVWF was achieved in all patients. Although AVWF thrombosis developed in one patient, no other complications were observed in the early postoperative period. The 2-month AVWF patency rate was 90.9%. The ePTFE sutures demonstrated an adequate sliding property which make this monofilament a satisfactory material for vascular anastomosis constructed using this technique. PMID:11318139

Cavallini, M



Microbiology of Explanted Suture Segments from Infected and Noninfected Surgical Patients  

PubMed Central

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.

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



The Transverse Compression of Anisotropic Fibre Monofilaments  

Microsoft Academic Search

A synthetic fibre monofilament was compressed between transparent flats mounted on a microscope stage, and an image of the contact area thrown onto a screen. The contact area was determined as a function of load for polyethylene terephthalate, polypropylene and nylon monofilaments. These monofilaments can be regarded as transversely isotropic elastic cylinders and show considerable anisotropy, the extensional modulus being

D. W. Hadley; I. M. Ward; J. Ward



Cranial sutures  


... sit up). Without flexible sutures and fontanelles, the child's brain would be constricted in the cranial bones and could not grow enough. The child would develop brain damage. Feeling the cranial sutures and fontanelles is ...


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

Microsoft Academic Search

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

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



Culture of cells gained from temporomandibular joint cartilage on non-absorbable scaffolds  

Microsoft Academic Search

The objective of this study was to investigate the adhesion, spreading and extracellular matrix synthesis of temporomandibular joint (TMJ) derived cells on non-absorbable scaffold materials to ultimately provide a durable stress-absorbent framework within tissue-engineered disc transplants. Scaffolds were prepared by polyamide monofilaments, expanded polytetrafluoroethylene (ePTFE) monofilaments, polyglycolic acid monofilaments (control) or natural bone mineral blocks (control). These scaffolds were incubated

Ingo N. G. Springer; Bernd Fleiner; Søren Jepsen; Yahya Açil



Technical considerations in knot construction. Part I. Continuous percutaneous and dermal suture closure.  


The purpose of this investigation was to determine the security of the square knot tied with one looped end and one free end versus the security of the square knot tied with two free ends. Size 4/0 and size 6/0 monofilament nylon, polypropylene, and Biosyn sutures were selected for this evaluation. The mechanical performance of these sutures was judged according to knot breakage force and number of throws required to attain security. Knots with one looped end and one free end require more throws to ensure knot security than do knots constructed from two single suture strands of comparable sizes and types of sutures. PMID:9258786

Annunziata, C C; Drake, D B; Woods, J A; Gear, A J; Rodeheaver, G T; Edlich, R F


Growth orientation of heart cells on nylon monofilament  

Microsoft Academic Search

Summary A new method is described for orienting the growth of embryonic chick heart cells as thin annuli about nylon monofilament. Analytical measurements of cell water, intracellular potassium, cell volume, and cell surface area incorporate several new techniques and provide the quantitative basis for characterizing the respective cell types in the preparation. The measurements support the hypothesis that tissue culture

C. Russell Horres; Melvyn Lieberman; Joyce E. Purdy



Effect of suture material on gap formation and failure in type 1 FDP avulsion repairs in a cadaver model  

Microsoft Academic Search

BackgroundAn in vitro cyclical testing simulating a passive mobilisation protocol was used to compare repair of flexor digitorum profundus tendon with modified-Bunnell two-strand pullout technique using a monofilament (Prolene), braided polyester (Ethibond) and a synthetic polyfilament ensheathed by caprolactan (Supramid) sutures.

F. B. Schreuder; P. J. Scougall; E. Puchert; F. Vizesi; W. R. Walsh



Sensory testing in leprosy: comparison of ballpoint pen and monofilaments.  


The 10 g monofilament has been replaced by the ballpoint pen in routine sensory testing of nerves in leprosy control in Ethiopia. Results of sensory testing between the ballpoint pen and different monofilaments on hands and feet were compared. Ballpoint pen underdiagnosis of loss of sensation was defined to occur when the pen was felt and the monofilament was not. Differences were evaluated both for individual test points (test point level) and for the test points of extremities collectively (extremity level). An extremity (either a hand or a foot) was defined as having sensory nerve function impairment (SNFI) if a supplying nerve had SNFI, which was the case when sensation was absent in two or more test points in the area supplied by that nerve. At test point level, the percentages with ballpoint pen underdiagnosis relative to the 2, 10, 20 and 50 g monofilaments were 40, 21, 9 and 7%, respectively, in the hands, and 47, 30, 15 and 7% in the feet. Ballpoint pen underdiagnosis percentages of SNFI at extremity level were 32, 18, 8 and 9% in the hands, and 37, 26, 14 and 6% in the feet. The risk of ballpoint pen underdiagnosis appears to be higher in extremities without visible damage. In conclusion, substantial levels of underdiagnosis of sensory loss with the ballpoint pen were observed. However, the consequences for the prognosis of treatment with corticosteroids in patients with the more subtle sensation loss noted here need to be established. Development and testing of guidelines is a prerequisite for the use of the ballpoint pen. PMID:12669932

Koelewijn, L F; Meima, A; Broekhuis, S M; Richardus, J H; Mitchell, P D; Benbow, C; Saunderson, P R



Short-term complications after vaginal prolapse surgery: do suture characteristics influence morbidity?  


Pelvic organ prolapse (POP) surgery can be associated with early postoperative morbidity resulting in significant service utilisation. This study aimed to investigate whether different suture materials cause different rates of early postoperative morbidity by comparing two cohorts using case-control methodology. A total of 100 women undergoing POP surgery with vaginal closure with 1 Vicryl (polyglycolic acid) multifilament sutures were matched by operation with a cohort in which 2/0 Monocryl (poliglecaprone 25) monofilament sutures were used. The multifilament suture group had significantly higher rates of offensive discharge (p<0.001), vaginal bleeding (p<0.001) and vaginal pain (p=0.004). They were more likely to receive medical advice (0.007). Patients in the multifilament group were no more likely to suffer from a UTI (p=1.000) or to be readmitted postoperatively (p=1.000). Size 1 multifilament sutures result in higher levels of postoperative morbidity when compared with 2/0 monofilament sutures. PMID:23075355

Patil, A; Duckett, J



Argon endolaser suture lysis  

NASA Astrophysics Data System (ADS)

Purpose: To develop a simple suture lysis technique for post-trabeculectomy examinations under anesthesia since slit lamp laser suture lysis in the clinic cannot be performed on infants and young children. Methods: An argon endolaser probe lysed 10-0 nylon suture through conjunctiva harvested from human cadaver eyes. Since suture lysis failed with the thick Hoskins lens, clear plastic from the suture package compressed the conjunctiva. The conjunctiva was examined histologically. Results: Argon laser suture lysis (250 mW, 0.1 sec, 488 - 514 nm) was achieved without conjunctival damage. Conclusion: The argon endolaser probe is effective for suture lysis when the slit lamp cannot be used.

Cameron, Bruce D.; Joos, Karen M.; Shen, Jin-Hui



"Tissue-drag" with polyglycolic acid (Dexon) and polyglactin 910 (Vicryl) sutures in strabismus surgery.  


The new absorbable synthetic sutures, polyglycolic and (Dexon) and Polyglactin 910 (Vicryl), are excellent sutures for strabismus surgery, but they have a bothersome tendency to attract adjacent tissue (tissue-drag). This difficulty is found especially with the 5-0 size suture, less so with the 6-0 size suture, and minimally with the 7-0 size suture. The presence and number of short, stubbly, protuberant strands (hooklets) seen on the surface of these sutures under high magnification correlates with the lack of ease with which the sutures pass through tissue. Other factors involved in tissue-drag include the crevices between braids in these sutures and the fiber-tissue friction due to the innate nature of the suture materials. Sutures which pass with ease through tissue, such as catgut and nonabsorbable sutures, are seen to have smooth surfaces under high magnification. Coating the 5-0 and 6-0 Dexon and Vicryl sutures to smooth their surfaces and reduce tissue-drag was ineffective with isotonic saline solution, minimally to moderately effective with glycerine and with methylcellulose and polyvinyl alcohol solutions, but highly effective with peanut and sesame oils. Though tissue-passage of Dexon and Vicryl sutures was much improved by coating with oil and entirely satisfactory, it still was not quite as good as with catgut. Clinically, the oil did not compromise the knot security or ease of handling of the sutures. No unusual postoperative reaction was seen with the use of the oiled sutures. Although oiling the synthetic absorbable sutures at time of surgery is effective, we recommend that suture manufacturers reduce the tissue-drag of synthetic absorbable sutures either by smoothing the surface in the manufacturing process or by developing an absorbable coating applied to the sutures during manufacture. PMID:1018225

Apt, L; Henrick, A


Potential strength of Nicalon™, Hi Nicalon™, and Hi Nicalon Type S™ monofilaments of variable diameters  

Microsoft Academic Search

This paper discusses the material strength of Nicalon™, Hi Nicalon™, and Hi Nicalon Type S™ monofilaments. The Nicalon™ family of monofilaments is shown to possess variable diameter along the gauge, and thus the strength on the supplier's data sheet might have been biased negatively from the intrinsic material strength. The material strength, or the potential strength of imaginary uniform diameter

Tetsuya Morimoto; Toshio Ogasawara



Horizontal Running Mattress Suture Modified with Intermittent Simple Loops  

PubMed Central

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

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



Horizontal running mattress suture modified with intermittent simple loops.  


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

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



Comparison of the in vivo behavior of polyvinylidene fluoride and polypropylene sutures used in vascular surgery.  


To find a nonabsorbable suture material that is equivalent to polypropylene in ease of handling and tensile properties, and that has low thrombogenicity and tissue reactivity but improved biostability, some researchers and clinicians see merit in considering the suitability of monofilaments made from polyvinylidene fluoride. The current animal study investigated the relative biocompatibility and biostability of these two suture materials by using them to anastomose a polyester arterial prosthesis in a canine thoracoabdominal bypass model for 10 periods of implantation ranging from 4 hr to 2 years. Biocompatibility was assessed with light and scanning electron microscope examinations of the explanted sutures, and biostability of the cleaned sutures was determined by Fourier transform infrared spectroscopy and scanning electron microscope analysis. The polyvinylidene fluoride and polypropylene sutures were found to have similar handling and healing characteristics. During the first months in vivo, both types of suture experienced a temporary increase in carbonyl group absorption that coincided with the duration of the inflammatory response. After 1 and 2 years in vivo, the explanted polypropylene sutures showed visual evidence of surface stress cracking. This was not found with the explanted polyvinylidene fluoride sutures. These results suggest that polyvinylidene fluoride may be more biostable than polypropylene in the long term. PMID:9617952

Mary, C; Marois, Y; King, M W; Laroche, G; Douville, Y; Martin, L; Guidoin, R


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

PubMed Central

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

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



Prospective randomized controlled trial investigating the type of sutures used during hepatectomy  

PubMed Central

AIM: To determine whether absorbable sutures or non-absorbable sutures are better in preventing surgical site infection (SSI), in this paper we discuss the results of a randomized clinical trial which examined the type of sutures used during hepatectomy. METHODS: All hepatic resections performed from January 2007 to November 2008 at the Department of Surgery at Iizuka Hospital in Japan were included in this study. There were 125 patients randomly assigned to an absorbable sutures (Vicryl) group or non-absorbable sutures (Silk) group. RESULTS: SSI was observed in 13.6% (17/125) patients participating in this study, 11.3% in the Vicryl group and 15.8% in the Silk group. Incisional SSI including superficial and deep SSI, was observed in 8% of the Vicryl group and 9.5% of the Silk group. Organ/space SSI was observed in 3.2% of the Vicryl group and 6.0% of the Silk group. There were no significant differences, but among the patients with SSI, the period for recovery was significantly shorter for the Vicryl group compared to the Silk group. CONCLUSION: The incidence of SSI in patients receiving absorbable sutures and silk sutures is not significantly different in this randomized controlled study; however, the period for recovery in patients with SSI was significantly shorter for absorbable sutures.

Harimoto, Norifumi; Shirabe, Ken; Abe, Tomoyuki; Yukaya, Takafumi; Tsujita, Eiji; Gion, Tomonobu; Kajiyama, Kiyoshi; Nagaie, Takashi



Triclosan?Coated Sutures in Oral Surgery  

Microsoft Academic Search

Background. The objective was to identify the microorganisms present on polyglycolic?acid braided suture mate? rial coated with triclosan used in the oral cavity and the in vitro evaluation of the bactericidal properties of tri? closan?coated material. Material and Methods. Material was collected from 11 patients subjected oral surgery. The first material was non? absorbable monofilamen the second triclosan?coated multifilament. Both




Hypersensitivity to suture anchors.  


Hypersensitivity to suture anchor is extremely rare. Herein, we present a case in which hypersensitivity to suture anchor was strongly suspected. The right rotator cuff of a 50-year-old woman was repaired with a metal suture anchor. Three weeks after the surgery, she developed erythema around her face, trunk, and hands, accompanied by itching. Infection was unlikely because no abnormalities were detected by blood testing or by medical examination. Suspicious of a metallic allergy, a dermatologist performed a patch testing 6 months after the first surgery. The patient had negative reactions to tests for titanium, aluminum, and vanadium, which were the principal components of the suture anchor. The anchor was removed 7 months after the first surgery, and the erythema disappeared immediately. When allergic symptoms occur and persist after the use of a metal anchor, removal should be considered as a treatment option even if the patch test result is negative. PMID:23956902

Goto, Masafumi; Gotoh, Masafumi; Mitsui, Yasuhiro; Tanesue, Ryo; Okawa, Takahiro; Higuchi, Fujio; Shiba, Naoto



Stitches (Surgical Sutures)  


... as stitches, are synthetic or animal gut-derived threads used to close a wound after a surgical ... together. Placing a suture involves taking a long thread with a curved needle at one end. The ...


Title III section 313 release reporting guidance: Estimating chemical releases from monofilament fiber manufacturing  

SciTech Connect

Manufacturers of monofilament fibers may be required to report annually any releases to the environment of certain chemicals regulated under Section 313, Title III, of the Superfund Amendments and Reauthorization Act (SARA) of 1986. The document has been developed to assist monofilament fiber manufacturers in the completion of Part III (Chemical Specific Information) of the Toxic Chemical Release Inventory Reporting Form. Included herein is general information on toxic chemicals used and process wastes generated, along with several examples to demonstrate the types of data needed and various methodologies available for estimating releases.

Not Available



Adjustable suture strabismus surgery  

PubMed Central

Surgical management of strabismus remains a challenge because surgical success rates, short-term and long-term, are not ideal. Adjustable suture strabismus surgery has been available for decades as a tool to potentially enhance the surgical outcomes. Intellectually, it seems logical that having a second chance to improve the outcome of a strabismus procedure should increase the overall success rate and reduce the reoperation rate. Yet, adjustable suture surgery has not gained universal acceptance, partly because Level 1 evidence of its advantages is lacking, and partly because the learning curve for accurate decision making during suture adjustment may span a decade or more. In this review we describe the indications, techniques, and published results of adjustable suture surgery. We will discuss the option of ‘no adjustment' in cases with satisfactory alignment with emphasis on recent advances allowing for delayed adjustment. The use of adjustable sutures in special circumstances will also be reviewed. Consistently improved outcomes in the adjustable arm of nearly all retrospective studies support the advantage of the adjustable option, and strabismus surgeons are advised to become facile in the application of this approach.

Nihalani, B R; Hunter, D G



Popularity of suture materials among residents and faculty members of a postdoctoral periodontology program.  


AIM: The aim of the present study was to determine the favoritism of suture materials among a group of clinicians at a teaching institution. METHODS: The surveys included 11 absorbable and nine non-absorbable sutures. The surveyor was asked to select his or her suture preferences when it comes to using it in 13 different, commonly-performed surgical procedures. RESULTS: The surveys showed overall preferences for non-absorbable versus absorbable sutures. Chromic Gut with a 4-0 diameter thread reverse cutting FS2 needle was the most favored suture. For periodontal bone grafts and hard tissue ridge augmentation, polytetrafluoroethylene with a 4-0 thread and FS2 needle was preferred. For autogenous gingival grafts, gingival allografts, connective tissue grafts, frenectomy and frenoplasty, Chromic Gut with 5-0 diameter thread reverse cutting P3 needle was favored. For extraction socket preservation, soft tissue canine exposure, ridge augmentation, and dental implants, Chromic Gut with 4-0 diameter thread reverse cutting FS2 needle was preferred, and for sinus augmentation, Vicryl with a 4-0 diameter thread reverse cutting FS2 needle was favored. CONCLUSION: Absorbable sutures were preferred in the majority of periodontal procedures; however, non-absorbable sutures were favored in procedures that required longer healing or better stability of the flap edges in cases of periodontal and ridge augmentation. PMID:23595981

Maksoud, Mohamed; Koo, Samuel; Barouch, Kasumi; Karimbux, Nadeem



Preparation and Evaluation of Single-Crystal Yttrium Titanate-Based Monofilaments.  

National Technical Information Service (NTIS)

This SBIR Phase I research produced and characterized single-crystal monofilaments of Y2Ti2O(z) for preliminary evaluation as reinforcement. These Experiments were initiated without benefit of prior experience with the material because no crystal growth c...

J. H. Sheehan R. J. Prince G. H. Reynolds J. S. Haggerty J. Sigalovski



Capromed — An antibacterial suture material  

Microsoft Academic Search

1. Coating of modified polycaprolactam fibers with biocompatible copolymer makes the fibers pseudo monofilamentous and prevents cellular elements from penetrating through into the suture thread. This effect in the Capromed suture material holds for 7–21 days after implantation.

A. V. Volenko; Ch. S. Germanovich; O. P. Gurova; R. A. Shvets



Tension of knotted surgical sutures shows tissue specific rapid loss in a rodent model  

PubMed Central

Background Every surgical suture compresses the enclosed tissue with a tension that depends from the knotting force and the resistance of the tissue. The aim of this study was to identify the dynamic change of applied suture tension with regard to the tissue specific cutting reaction. Methods In rabbits we placed single polypropylene sutures (3/0) in skin, muscle, liver, stomach and small intestine. Six measurements for each single organ were determined by tension sensors for 60 minutes. We collected tissue specimens to analyse the connective tissue stability by measuring the collagen/protein content. Results We identified three phases in the process of suture loosening. The initial rapid loss of the first phase lasts only one minute. It can be regarded as cutting through damage of the tissue. The percentage of lost tension is closely related to the collagen content of the tissue (r = -0.424; p = 0.016). The second phase is characterized by a slower decrease of suture tension, reflecting a tissue specific plastic deformation. Phase 3 is characterized by a plateau representing the remaining structural stability of the tissue. The ratio of remaining tension to initial tension of phase 1 is closely related to the collagen content of the tissue (r = 0.392; p = 0.026). Conclusions Knotted non-elastic monofilament sutures rapidly loose tension. The initial phase of high tension may be narrowed by reduction of the surgeons' initial force of the sutures' elasticity to those of the tissue. Further studies have to confirm, whether reduced tissue compression and less local damage permits improved wound healing.



Man-made yarns for reabsorbable surgical suture materials  

Microsoft Academic Search

-- A brief analysis has been made of domestic and foreign scientific-technical literature about the development of reliable absorption surgical suture materials (SSM). Significant attainments in solving this question are the appearance abroad of new synthetic absorbable SSM: Dexon, Vycryl, and PDS. Attention is drawn to the wide use of copolymers of various classes for these purposes (polyester, polyurethane, polyester

B. L. Biber; N. L. Kuz'mina



Releasable suture technique for trabeculectomy.  


We studied the effect of the releasable suture technique on immediate postoperative intraocular pressure (IOP). Nine eyes of nine patients with glaucoma had trabeculectomy with a releasable suture. In the six eyes that did not receive antimitotics, the suture was released by the fifth postoperative day; in the others suture release was delayed up to the fourteenth day. Of the nine patients, one had an acceptable postoperative IOP and did not need suture release; in another the suture broke and could not be released. In the remaining seven patients, the difference between the pre-release and post-release IOP was statistically significant (p < 0.001). The complications of this technique include failed suture release, subconjunctival hematoma and a distinctive "windshield wiper" keratopathy. PMID:8262608

Jacob, P; Thomas, R; Mahajan, A; Mathai, A; Gieser, S C; Raju, R



Development of Manufacturing Process for Large-Diameter Composite Monofilaments by Pyrolysis of Resin-Impregnated Carbon-Fiber Bundles.  

National Technical Information Service (NTIS)

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 correl...

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




PubMed Central

Suture materials in orthopaedic surgery are used for closure of wounds, repair of fascia, muscles, tendons, ligaments, joint capsules, and cerclage or tension band of certain fractures. The purpose of this study was to compare the biomechanical properties of eleven commonly used sutures in orthopaedic surgery. Three types of braided non-absorbable and one type of braided absorbable suture material with different calibers (n=77) underwent biomechanical testing for maximum load to failure, strain, and stiffness. All samples were tied by one surgeon with a single SMC (Seoul Medical Center) knot and three square knots. The maximum load to failure and strain were highest for #5 FiberWire and lowest for #0 Ethibond Excel (p<0.001). The stiffness was highest for #5 FiberWire and lowest for #2-0 Vicryl (p<0.001). In all samples, the failure of the suture material occurred at the knot There was no slippage of the knot in any of the samples tested. This data will assist the orthopaedic surgeon in selection and application of appropriate suture materials and calibers to specific tasks.

Najibi, S; Banglmeier, R; Matta, JM; Tannast, M



The best suture for hypospadias?  


In a study designed to determine the best suture for use in hypospadias surgery, polydioxanone (PDS), chromic catgut, and polyglycolic acid (Dexon) were studied under similar conditions in the penile foreskin of 16 baboons. Gross and microscopic observations were made at intervals of six to forty-eight days. The wounds sutured with catgut were all healed by twenty-four days with complete suture resorption and no evidence of scar formation. Both polyglycolic acid and polydioxanone sutures showed delayed resorption, wound abscesses, and granulomas. Catgut remains the best available suture to use in the penile foreskin. Polyglycolic acid and polydioxanone sutures, because of their prolonged resorption and excess reaction, should not be used in hypospadias surgery. PMID:3107191

Bartone, F; Shore, N; Newland, J; King, L; DuPlessis, D



Barbed sutures in body surgery.  


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

Moya, Alexander P



SiC monofilament-reinforced Si3N4 matrix composites  

SciTech Connect

Unidirectional SiC monofilament-reinforced Si3N4 matrix composites were fabricated by the slurry-coating and filament-winding process, followed by hot pressing. Fracture strength and toughness parameters were assessed in comparison with the matrix material. Composite strengths were controlled by processing-related flaws in the SiC filaments. Moderate improvement in apparent fracture toughness (KQ) and significant improvement in work-of-fracture text (R) were also observed for the unidirectional composites relative to the matrix ceramic. 30 references.

Shetty, D.K.; Pascucci, M.R.; Mutsuddy, B.C.; Wills, R.R.



Suspension of the gluteal region with silhouette sutures.  


The authors present their minimally invasive gluteopexy technique, using polypropylene 2-0 sutures with 10 absorbable polylactic cones in their distal section (Silhouette Lift, Irvine, California) to improve the anteroposterior projection of the gluteal region. Histological study of the reaction of adipose tissue surrounding the cones previously has shown that, 3 months after insertion of the sutures, fibrous scar tissue is sufficiently developed to resist the weight of the tissues. On the basis of this finding, the authors decided to perform the gluteopexy with sutures, in 2 surgical steps. During the first step, the sutures are inserted in the adipose tissue without any proximal fixation. In the second step, performed 3 months after the first procedure when the fibrous reaction is more solid, the sutures are tightened to obtain the gluteopexy. Among the advantages of this technique are its simplicity, the fact that it produces no traumatic effects, and the fact that it can be performed with local anesthetic, reducing surgical time. It is also possible to combine this procedure with lipofilling or liposuction techniques. PMID:24084884

de Benito, Javier; Pizzamiglio, Roberto



Releasable suture technique for trabeculectomy.  


A retrospective review of 154 trabeculectomies with releasable sutures was performed to assess the effect of suture release on intraocular pressure (IOP) at various postoperative periods. Release of the suture was necessary in 38% of cases. The immediate reduction in IOP was significant (p < 0.01) when the suture was released during the first three postoperative weeks. Seventy percent of eyes had a reduction in IOP more than 5 mmHg if released within the first week compared to 20% after the third week. With suture release after the third postoperative week, there was no clinically significant decrease in IOP. The decrease in IOP was similar in eyes undergoing trabeculectomy alone or when cataract extraction through a separate corneal incision was undertaken simultaneously. The period during which release of suture was effective was not prolonged by use of antimetabolites. Complications included a typical windshield-wiper keratopathy (18 eyes), failure to release the suture (13 eyes), epithelial abrasion (6 eyes) and a sub-conjunctival bleed (1 eye). PMID:9475010

Thomas, R; Jacob, P; Braganza, A; Mermoud, A; Muliyil, J



Arthroscopic Suture Anchor Tenodesis: Loop-Suture Technique  

PubMed Central

With advancements in arthroscopic surgery, arthroscopic biceps tenodesis with suture anchor recently has been reported to be a reasonable option for the treatment of biceps pathologies, especially for those that are symptomatic or accompanied by a rotator cuff tear. We introduce our technique of arthroscopic biceps tenodesis with suture anchor that we call the loop-suture technique, which is constructed with 1 loop strand and another sutured strand. This technique can help to improve biceps grip and simultaneously minimize longitudinal splitting of the tendon. In addition, it is relatively simple and can be performed with the use of conventional devices and arthroscopic portals used for rotator cuff repair, without the formation of additional portals or a separate incision for the tenodesis.

Shon, Min Soo; Koh, Kyoung Hwan; Lim, Tae Kang; Lee, Seung Won; Park, Young Eun; Yoo, Jae Chul



Tensile strength requirements for sutures.  


The official requirements for sutures in Australia are those of British Pharmacopoeia (B.P.). The results of a survey conducted by this Laboratory indicate that the B.P. test and specifications for knot pull strength are no longer appropriate for sutures currently available in this country. It is suggested that tensile strength measurements on sutures should be carried out, without prior soaking, using the load cell type of constant rate of extension apparatus rather than the pendulum type tester specified in the B.P. Use of a simple knot is suitable for testing synthetic sutures, but the surgeon's knot is preferred for catgut. All products tested easily met both the B.P. and the United States Pharmacopeia (U.S.P.) requirements for tensile strength. PMID:6131988

Lee, S; Hailey, D M; Lea, A R



Ureterolithiasis in a Renal Transplant Patient Secondary to Encrustation about a Suture Line.  


A renal transplant recipient presented with abdominal pain and anuria secondary to multiple radio-opaque obstructing calculi. A ureteroscopy with ultrasonic disintegration was done, and the fragments were spontaneously passed later. The calculi had formed on a non-absorbable suture line. Although ureterolithiasis in the transplanted kidney is amongst the least common of the urological complications following renal transplantation, it is an important reversible cause of obstruction that should always be considered. Also, non-absorbable suture lines should not be used in the urinary tract because they may serve as a nidus for stone formation. PMID:18583741

Hadidi, M; Al-Akash, N; Affarah, H; El-Lozi, M


Everting sutures in involutional entropion.  


Involutional entropion is the commonest cause of entropion in the elderly population. Many surgical procedures have been described to correct it. The everting suture technique is simple and quick and can be undertaken in the clinic or even away from a medical setting. However, it has been regarded as a temporary cure, especially in the presence of horizontal lower lid laxity. We reviewed the results of everting sutures in 55 lids of 50 patients. The minimum follow-up was 18 months. 78% of patients had no recurrence of their entropion. Our results suggest that horizontal eyelid laxity may not be the only major factor in recurrent entropion following everting sutures. Dermatochalasis with orbital fat prolapse may also contribute. PMID:12045982

Meadows, Alison E.R.; Reck, Anne C.; Gaston, Hannah; Tyers, Anthony G.



Absorb & Repel  

NSDL National Science Digital Library

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.

Museum, Kohl C.



Ureteral reaction to suture material.  


Dog ureters were anastomosed end to end using either chromic catgut, polyglycolic acid (PGA), polyglactin-910, or polypropylene sutures. Analysis of luminal diameters, fibrosis, scar vascularity, and inflammatory reaction four and seven months later indicated that in ureters of the uninfected dog the best results were obtained with polyglycolic acid. Ureters anastomosed with catgut gave results that were slightly less acceptable. PMID:6301130

Smith, M W; Bartone, F F; Tan, E C; Gardner, P J



Barbed sutures in aesthetic plastic surgery: evolution of thought and process.  


The evolution of barbed suture technologies and their application in the field of plastic surgery is now in its third decade. Much has been learned along the way. Initial excitement was often followed by disappointment as we learned more about the limited longevity of minimally invasive procedures and complications arising from various suture designs of the past. Some of the early designs, developed primarily for use in aesthetic facial procedures, included free-floating, bidirectionally barbed, nonabsorbable sutures; unidirectional barbed, nonabsorbable sutures; anchored, bidirectional, nonabsorbable double-threaded sutures; and a technology combining a nonabsorbable knotted thread and absorbable cones. More recently, a new, absorbable, unidirectional barbed suture design has become available. However, it should be noted that very limited data are available for any of the modified suture designs used in this field, and much of what has been published is based on the experience of a single user. The author has used the bidirectionally barbed Quill Knotless Tissue-Closure Device (Angiotech Pharmaceuticals, Inc, Vancouver, British Columbia, Canada), the most common barbed suture in both facial and other aesthetic plastic surgery procedures, with considerable success in various open aesthetic facial procedures, including suspension of the brow and midface, platysmaplasty, and lateral neck suspension. It is the author's experience that completion of 1 to 2 cases with this technology is sufficient to achieve competency in the closure techniques discussed in this article and that time savings can be realized using this device in various breast and body contouring procedures, including mastopexy, reduction mammoplasty, abdominoplasty, bodylift, and brachioplasty. PMID:24084876

Paul, Malcolm D



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

PubMed Central

Aims To identify the threshold of reduced sensory perception in Type 2 diabetes mellitus (Type 2 DM) using a range of research grade monofilaments. Methods Three groups of participants were recruited into a between subject, cross-sectional study. Group 1(NEW), persons with Type 2 DM diagnosed for less than 2 years (n = 80); Group 2 (EST) persons with Type 2 DM diagnosed for more than 2 years (n = 91), and Group 3, a Comparison group without Type 2 DM (n = 73), resulted in a total study population, n = 244. Research grade monofilaments (2, 4, 6, 8 and 10-gram) were employed using standardised protocol, at 6 sites on the plantar aspect of both feet. The demographic and anthropometric measures of gender, age, height, weight, body mass index (BMI), blood pressure and duration of Type 2 DM since diagnosis (if applicable) of the participants were analysed. Results Perception of the research grade monofilaments differed significantly between the 3 groups (p < 0.05). The 6-gram monofilament was found to be the threshold of normal perception, based on 90% of the Comparison group perceiving the 6-gram monofilament at all sites in contrast to 64% of NEW and 48% of EST groups. Conclusion The 6-gram monofilament was identified as the threshold of normal sensory perception. Inability to perceive the 6-gram monofilament indicates, when using the method described in this study, that diminution of sensory perception is evident. Employing a range of monofilaments, 6, 8 and 10-grams in Type 2 DM foot screening would allow the clinical detection of deteriorating sensory perception and enable implementation of foot protection strategies at an earlier stage than is currently practised.

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



Evaluation of female external genitalia sensitivity to pressure\\/touch: a preliminary prospective study using Semmes-Weinstein monofilaments  

Microsoft Academic Search

Objectives. To assess the use of pressure aesthesiometers (Semmes-Weinstein monofilaments) in the evaluation of female external genitalia. The pressure aesthesiometers are widely used to assess the pressure\\/touch perceptions of the hand, face, and breast dermatomes.Methods. Thirty-two consecutive neurologically intact women (mean age 48.7 ± 13.8 years) and 5 neurologically impaired women referred for a routine gynecologic examination were prospectively enrolled.

Lauri J Romanzi; Asnat Groutz; Fariha Feroz; Jerry G Blaivas



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


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

Dyos; Shatwell



Reliability of Semmes Weinstein monofilament and ballpoint sensory testing, and voluntary muscle testing in Bangladesh.  


The reliability of methods of testing nerve function is important, since diagnostic decision making is a direct function of the quality of the test. Three methods of nerve function testing were investigated at the Danish Bangladesh Leprosy Mission (DBLM) in north Bangladesh, and assessed for inter-observer reliability. The three methods were 1) ballpoint pen test (BPT) for sensory function; 2) graded Semmes Weinstein monofilament test (SWM) for sensory function and 3) voluntary muscle testing (VMT) for motor function. The weighted kappa (kappa w) statistic was used to express inter-observer reliability. Using this statistic, 0 represents agreement no better than random, and 1.0 complete agreement. kappa w values of > or = 0.80 are reckoned to be adequate for monitoring and research. Fifty-three patients were tested, a Senior physiotechnician acting as 'gold standard' against whom four other staff physiotechnicians were assessed. All three testing methods were found to have minimal inter-observer variation, with the kappa w for inter-observer agreement using BPT being 0.86, the SWM 0.92, and VMT 0.94. It is concluded that in trained and experienced hands, all three methods are reliable and repeatable to a level allowing confident use of results obtained in monitoring and research. PMID:10603720

Anderson, A M; Croft, R P



Termino-lateral nerve suture in lesions of the digital nerves: clinical experience and literature review.  


Documented experience of treatment of digital nerve lesions with the termino-lateral (end-to-side) nerve suture is limited. Our clinical experience of this technique is detailed here alongside a systematic review of the previous literature. We performed, from 2002 to 2008, seven termino-lateral sutures with epineural window opening for digital nerve lesions. Functional outcome was analysed using the two-point discrimination test and the Semmes-Weinstein monofilament test. The results showed a sensory recovery of S3+ in six cases and S3 in one case. The mean distance found in the two-point discrimination test was 12.7 mm (range 8-18 mm). After a review of the literature, we were able to obtain homogeneous data from 17 additional patients operated by termino-lateral coaptation. The overall number of cases included in our review was 24. A sensory recovery was observed in 23 out of 24 patients. The functional results were S0 in one case, S3 in one case, S3+ in twenty cases and S4 in two cases. Excluding the one unfavourable case, the mean distance in the two-point discrimination test was 9.7 mm (range 3-18 mm). It can thus be concluded that the treatment of digital nerve lesions with termino-lateral suture showed encouraging results. Based on the results obtained in this current study we believe that in case of loss of substance, end-to-side nerve coaptation may be an alternative to biological and synthetic tubulisation when a digital nerve reconstruction by means of nerve autograft is declined by the patient. PMID:19687081

Artiaco, S; Tos, P; Conforti, L G; Geuna, S; Battiston, B



Sound Absorbers  

NASA Astrophysics Data System (ADS)

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

Fuchs, H. V.; Möser, M.


Composite surgical sutures with bioactive glass coating.  


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

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



On Suturing Simulation with Haptic Feedback  

Microsoft Academic Search

We present a mechanics-based haptic simulation of an arbitrary suturing task for a simple skin or a soft tissue wound closure.\\u000a The pre-wound suturing target, the skin or the deformable tissue, is modeled as a modified mass-spring system. The suturing\\u000a material is modeled based on the linear finite-element model with some novel extensions for enhancing the computation of the\\u000a constrained

Hans Fuhan Shi; Shahram Payandeh



Suturing a tear of the anterior capsulorhexis  

PubMed Central

Aim To describe a new technique of suturing a tear in the anterior capsulorhexis. Methods Continuous curvilinear capsulorhexis (CCC) with lens removal was done in five fresh cadaver eyes. The diameter of the CCC was measured with a calliper. Using the same calliper a tear of the CCC was created while opening the calliper's arms. The distance between the calliper's arms needed to tear the CCC was documented. Using 9?0 Ethilon 9011, CS 160?6 sutures in two eyes, 9?0 Prolene, D?8229, CTC?6L sutures in two eyes, and 10?0 Prolene, 9090, CTC?6 suture in one eye, the tears were sutured. A tear in the CCC was created again in the same way as the first tear. The distance between the calliper's arms needed to tear the CCC was documented again. Results Suturing of the tear restored some of the strength/elasticity of the CCC. Better results were found while using the 9?0 Prolene, D?8229, CTC?6L sutures than with the two others sutures. Conclusions Suturing of a broken CCC can restore at least some of the strength/elasticity of the CCC. This can be important before intraocular lens (IOL) implantation for the safety of the implantation or after the implantation to ensure proper fixation of the IOL.

Kleinmann, G; Chew, J; Apple, D J; Assia, E I; Mamalis, N



Polyglactin 910 suture in urinary tract.  


Cystotomies in guinea pigs and ureteral anastomoses in dogs were sutured with polyglactin 910. Silk and chromic catgut were used as control sutures in the bladders and chromic catgut in the ureters. Three months postoperatively in bladders sutured with polyglactin 910 small epithelial cysts were noted, which increased in size with time. In ureters sutured with polyglactin 910 cystic diverticula were observed eight months postoperatively. Because of the difference of tissue reaction to polyglactin 910 compared with catgut, further long-term studies are urged in different species of animals, prior to the clinical use of polyglactin 910 in the urinary tract. PMID:871044

Bartone, F F; Gardner, P J; Hutson, J C



Cranial reossification with absorbable plates.  


The purpose of this study was to examine the effect of Lactosorb absorbable plates on bone healing across cranial bone defects in the rabbit skull. Two 10-mm diameter parietal skull defects were created in each of 20 rabbits, with one defect being placed on either side of the sagittal suture. In 10 rabbits, an absorbable plate was placed across both the inner and outer cortices of the left defect, and in the other 10 rabbits, an absorbable plate was placed across the outer cortex only of the left defect. The right defect always served as the control side, with no plate being placed across it. Rabbits were killed an average of 25 weeks postoperatively. Areas of reossification in the experimental and control defects of each rabbit were then measured, examined histologically, and compared. Growth across defects spanned by one plate was also compared with growth across defects spanned by two plates. Histologic and statistical analyses revealed no significant differences in reossification between the control and experimental defects in each animal and between the defects spanned by one versus two plates. This study suggests that these copolymer absorbable plates neither inhibit nor facilitate reossification across 10-mm diameter rabbit cranial defects. PMID:11304603

Ascherman, J; Knowles, S; Marin, V; Prisant, N; Hu, G; Chiu, D T



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


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

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



Suturable adhesion-preventing membrane  

US Patent & Trademark Office Database

A suturable adhesion-preventing membrane has high suture strength, good biocompatibility, decomposition and absorption in a living body, sufficient adhesion-preventing effect, and desirable guided tissue regeneration. The membrane is composed of at least one non-woven fabric layer made of collagen fibers, or a laminated membranous substance consisting of at least one non-woven fabric layer made of collagen fibers and at least one sponge layer made of collagen, and a coating layer of gelatin or hyaluronic acid on the surface or surfaces of the above membrane. Preferably, the membrane comprises one to six compressed cross-linked collagen non-woven fabric layers wherein a layer has a fibers having a fiber diameter of 0.05 mm to 1.0 mm, a bulk density of 5.0.times.10.sup.-4 to 5 g/cm.sup.3 and a thickness of 0.1 mm to 50 mm, and a coating layer containing gelatin or hyaluronic acid and having a thickness of 0.05 mm to 20 mm, wherein the coating layer covers one or both sides or a part or whole of the surface of the membrane.




Microsoft Academic Search

Gabai's sutured manifold theory has produced many stun- ning results in knot theory. I will give a brief introduction to Scharle- mann's combinatorial version of sutured manifold theory and will then survey some applications, beginning with a seminal theorem of Gabai and ending with more recent work.



Caveats for the Use of Suspension Sutures  

Microsoft Academic Search

Suspension sutures may be considered a method for elevating ptotic tissue. This method often uses a limited access incision, and commonly is used in cosmetic surgery. The caveats for the technique are not well described. This article describes eight caveats for successful suture suspension. A method for performing this procedure with a spinal needle is described, using the lateral eyebrow

Donald A. Hudson; Desmond B. Fernandes



Mechanical properties of various circumferential tendon suture techniques  

Microsoft Academic Search

We evaluated the mechanical properties of six different circumferential tendon sutures with a variable number of suture strands. Seventy-two human cadaver flexor profundus tendons were cut and repaired using only a 6\\/0 polypropylene circumferential suture. The six running suture techniques were: Simple; Simple-locking; Lembert; Halsted; Cross-stitch; Lin-locking; using 10, 14 and 18 suture passes. The increased suture passes increased both

H. Kubota; M. Aoki; D. L. Pruitt; P. R. Manske



Technical considerations in knot construction. Part II. Interrupted dermal suture closure.  


The purpose of this study was to identify the optimal knot construction for interrupted dermal sutures. A synthetic braided absorbable suture, sizes 3-0 and 5-0, was selected for this evaluation. With reproducible mechanical performance tests, we determined that the construction of secure knots without ears required one additional throw as compared with secure knots with 3-mm ears. The direction of applied tension did not alter knot security, with the exception of granny knots, which required an extra throw when tension was applied parallel to the suture loop. Because interrupted dermal knot construction is accomplished without knot ears and with an applied tension parallel to the wound, one additional throw must be added to the knot to ensure knot security. PMID:9279704

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


21 CFR 878.5010 - Nonabsorbable polypropylene surgical suture.  

Code of Federal Regulations, 2010 CFR

... false Nonabsorbable polypropylene surgical suture. 878.5010 Section 878...GENERAL AND PLASTIC SURGERY DEVICES Surgical Devices § 878.5010 Nonabsorbable polypropylene surgical suture. (a) Identification....



21 CFR 878.5035 - Nonabsorbable expanded polytetrafluoroethylene surgical suture.  

Code of Federal Regulations, 2013 CFR

...Nonabsorbable expanded polytetrafluoroethylene surgical suture. 878.5035 Section 878...GENERAL AND PLASTIC SURGERY DEVICES Surgical Devices § 878.5035 Nonabsorbable expanded polytetrafluoroethylene surgical suture. (a)...



21 CFR 878.5010 - Nonabsorbable polypropylene surgical suture.  

Code of Federal Regulations, 2013 CFR

... false Nonabsorbable polypropylene surgical suture. 878.5010 Section 878...GENERAL AND PLASTIC SURGERY DEVICES Surgical Devices § 878.5010 Nonabsorbable polypropylene surgical suture. (a) Identification....



Radiofrequency and its effect on suture strength.  


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

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



Suturing for optimal soft-tissue management.  


Establishing nontension primary wound closure of various soft tissue flaps is paramount for optimal postsurgical wound healing. Surgical procedures that require clinical flap manipulation, such as those used with traditional periodontal therapy, periodontal plastic cosmetic surgery, hard and soft tissue regeneration, and the excision of pathologic tissue, also require excellence in execution. Also paramount to clinical success is a thorough understanding of the various techniques of surgery, suturing, and the materials currently available to ensure the desired clinical results. This article will discuss the rationale of specific suturing techniques and suture materials to help the clinician obtain optimal wound closure. PMID:19400063

Silverstein, Lee H; Kurtzman, Gregori M; Shatz, Peter C



Histopathological evaluation of rotation sutures for involutional entropion  

Microsoft Academic Search

Rotation sutures are a popular method of temporarily correcting involutional entropion. The permanence of the procedure depends on a fibrotic scar along the suture tracks. Sutures which create generous scars would probably produce the most satisfactory results. In this study 4-0 chromic gut, nylon, and silk sutures were evaluated in rabbit lower eyelids for their ability to create histologically demonstrable

S R Seiff; M Kim; E L Howes



Competitive analysis of intraoperative adjustable suture with conventional suture technique in strabismus surgery  

Microsoft Academic Search

We compared the effectiveness of fixed conventional strabismus surgery (CSG) with a one-stage intraoperative adjustable suture\\u000a technique in 88 patients undergoing strabismus surgery (ASG) either with fixed conventional (38) or intraoperative adjustable\\u000a suture (50) technique. The mean correction of deviation with both near-fixation and distant-fixation for the ASG and CSG were\\u000a not different. One-stage intraoperative adjustable suture technique is safe

Ayse Gül Koçak Altintas; Çagatay Türker; Hasan Basri Çakmak; Saban Simsek



Preparation and evaluation of single-crystal yttrium titanate-based monofilaments. Final report, 15 February 1995-14 February 1996  

SciTech Connect

This SBIR Phase I research produced and characterized single-crystal monofilaments of Y2Ti2O(z) for preliminary evaluation as reinforcement. These experiments were initiated without benefit of prior experience with the material because no crystal growth citations were identified and equilibrium phase relationships were incomplete.

Sheehan, J.H.; Prince, R.J.; Reynolds, G.H.; Haggerty, J.S.; Sigalovski, J.



Strength of different meniscus suturing techniques.  


We measured and compared the primary stabilities of five different meniscal suturing techniques. The techniques tested were horizontal mattress, vertical mattress, knot-end, vertical, and vertical loop. Twenty bovine medial menisci were cut to simulate peripheral longitudinal tears and repaired with one of the five suture techniques. Then the two parts of the meniscus were pulled using the Instron Tensometer until failure occurred. Knot-end techniques gave inferior results (mean ultimate failure strength 64 +/- 5 N) compared with the other techniques. Vertical mattress failed at 130 +/- 3 N, vertical loop at 128 +/- 4.5 N, horizontal mattress at 98 +/- 5 N and vertical suturing at 136 +/- 2.7 N. This study shows the superior mechanical characteristic of the vertical suturing technique. PMID:9228313

A?ik, M; Sener, N; Akpinar, S; Durmaz, H; Göksan, A



Postkeratoplasty astigmatism control. Single continuous suture adjustment versus selective interrupted suture removal.  


Two different suturing techniques performed during keratoplasty were retrospectively evaluated to compare postkeratoplasty astigmatism, number of suture manipulations, and time to optical stability. One group of patients (n = 31) received a combination of continuous 11.0 nylon suture and 12 or 16 interrupted 10.0 nylon sutures (CCIS), which were selectively removed post-operatively to reduce astigmatism. The second group of patients (n = 26) received a single continuous 10.0 nylon suture (SCS) that was adjusted postoperatively at the slit lamp to regulate corneal astigmatism. Compared with the CCIS technique, adjusting the single continuous suture resulted in less postoperative astigmatism (SCS, 1.5 +/- 1.1 diopters [D]; CCIS, 3.2 +/- 1.9 D), fewer suture manipulations per patient (SCS, 0.9 +/- 0.7; CCIS, 3.8 +/- 1.8), and earlier optical stability for visual rehabilitation (SCS, 2.6 +/- 1.5 months; CCIS, 9.6 +/- 4.7 months) (P less than 0.01). No continuous sutures were broken during adjustment. The adjustable single continuous suture may offer an improved method for early control of postkeratoplasty astigmatism. PMID:2008275

Van Meter, W S; Gussler, J R; Soloman, K D; Wood, T O



Subscapularis repair with the suture shuttle loop technique.  


Successful techniques for arthroscopic repair of subscapularis tendon tears have been previously described in the literature. Recommendations regarding portal placement, tissue mobilization, and suture passage have been published. We present a novel technique that uses a shuttle suture passed with the Viper suture passer (Arthrex, Naples, FL) through a standard anterior arthroscopy portal. The described technique easily passes a suture through the subscapularis tendon while the surgeon visualizes suture placement from the posterior portal. PMID:23767007

Nystrom, Stephen; Fagan, Paul; Vedder, Kristin; Heming, James



Subscapularis Repair With the Suture Shuttle Loop Technique  

PubMed Central

Successful techniques for arthroscopic repair of subscapularis tendon tears have been previously described in the literature. Recommendations regarding portal placement, tissue mobilization, and suture passage have been published. We present a novel technique that uses a shuttle suture passed with the Viper suture passer (Arthrex, Naples, FL) through a standard anterior arthroscopy portal. The described technique easily passes a suture through the subscapularis tendon while the surgeon visualizes suture placement from the posterior portal.

Nystrom, Stephen; Fagan, Paul; Vedder, Kristin; Heming, James



An in vitro study assessing the effect of mesh morphology and suture fixation on bacterial adherence.  


PURPOSE: Prosthetic infections, although relatively uncommon in hernia surgery, are a source of considerable morbidity and cost. The aims of this experimental study were to assess the influence of the morphological properties of the mesh on bacterial adherence in vitro. The morphological properties assessed were the polymer type, filament type, filament diameter, mesh weight, mean pore size, and the addition of silver chlorhexidine and titanium coatings. In addition, the study assessed the effect on bacterial adherence of adding a commonly used suture to the mesh and compared adherence rates to self-gripping mesh that does not require suture fixation. METHODS: Eight commercially sourced flat hernia meshes with different material characteristics were included in the study. These were Prolene(®) (Ethicon(®)), DualMesh(®) (Gore(®)), DualMesh(®) Plus (Gore(®)), Parietex™ ProGrip (Covidien™), TiMesh(®) Light (GfE Medical), Bard(®) Soft Mesh (Bard(®)), Vypro(®) (Ethicon(®)), and Omyra(®) (Braun(®)). Individual meshes were inoculated with Staphylococcus epidermidis and Staphylococcus aureus with a bacterial inoculum of 10(2) bacteria. To assess the effect of suture material on bacterial adhesion, a sterile piece of commonly used monofilament suture material (2.0 Prolene(®), ZB370 Ethicon(®)) was sutured to selected meshes (chosen to represent different commonly used polymers and/or the presence of an antibacterial coating). Inoculated meshes were incubated for 18 h in tryptone soy broth and then analysed using scanning electron microscopy. A previously validated method for enumeration of bacteria using automated stage movement electron microscopy was used for direct bacterial counting. The final fraction of the bacteria adherent to the mesh was compared between the meshes and for each morphological variable. One-way analysis of variance (ANOVA) was performed on the bacterial counts. Tukey's test was used to determine the difference between the different biomaterials in the event the ANOVA was significant. RESULTS: Properties that significantly increased the mean bacterial adherence were the expanded polytetrafluoroethylene polymer (P < 0.001); multifilament meshes (P < 0.001); increased filament diameter (P < 0.001); increased mesh weight (P < 0.001); and smaller mean pore size (P < 0.001). In contrast, mesh coating with antibacterial silver chlorhexidine significantly reduced bacterial adhesion (S. epidermidis mean bacterial count 140.7 ± 19.1 SE with DualMesh(®) vs. 2.3 ± 1.2 SE with DualMesh(®) Plus, P < 0.001; S. aureus mean bacterial count 371.7 ± 22.7 SE with DualMesh(®) vs. 19.3 ± 4.7 SE with DualMesh(®) Plus, P = 0.002). The addition of 2.0 Prolene suture material significantly increased the mean number of adherent bacteria independent of the mesh polymer or mesh coating (P = 0.04 to <0.001). CONCLUSION: The present study demonstrates the significant influence of the prosthetic load on bacterial adherence. In patients at increased risk of infection, low prosthetic load materials, i.e., lightweight meshes with large pores, may be beneficial. Furthermore self-fixing meshes, which avoid increasing the prosthetic load and antibacterial impregnated meshes, may have an advantage in this setting. PMID:23780573

Sanders, D; Lambie, J; Bond, P; Moate, R; Steer, J A



New anti-infective coatings of surgical sutures based on a combination of antiseptics and fatty acids.  


Wound infection is a complication feared in surgery. The aim of this study was to develop new anti-infective coatings of surgical sutures and to compare the anti-microbial effectiveness and biocompatibility to the well-established Vicryl Plus. Synthetic absorbable PGA surgical sutures were coated with three different chlorhexidine concentrations and two different octenidine concentrations in combination with palmitic acid and lauric acid. Drug-release kinetics lasting 96 h were studied in phosphate-buffered saline at 37 degrees C. Anti-infective characteristics were determined by measuring the change in optical density of Staphylococcus aureus suspensions charged with coated sutures over time. Microorganisms adsorbed at the surface of coated sutures were assessed on blood agar plates and coated sutures eluted for 24 h were placed on bacterial lawns cultured on Mueller-Hinton plates to prove retained anti-microbial potency. A cell proliferation assay was performed to assess the degree of cytotoxicity. Anti-infective characteristics and biocompatibility were compared to Vicryl Plus. A coating technology for slow-release drug-delivery systems on surgical sutures could be developed. All coatings showed a continuous drug release within 96 h. Individual chlorhexidine and octenidine coated sutures showed superior anti-infective characteristics but inferior biocompatibility in comparison to Vicryl Plus. We conclude that the developed anti-infective suture coatings consisting of lipid-based drug-delivery systems in combination with antiseptics are highly effective against bacterial colonization in vitro; however, drug doses have to be adjusted to improve biocompatibility. PMID:19622281

Matl, F D; Zlotnyk, J; Obermeier, A; Friess, W; Vogt, S; Büchner, H; Schnabelrauch, H; Stemberger, A; Kühn, K-D



Fourier technique for studying ammonoid sutures  

SciTech Connect

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

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



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

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.

Kerr, Natalie C.



Transcutaneous lower blepharoplasty, painless suture removal.  


Despite being referred to as one of the more challenging procedures in plastic surgery, lower blepharoplasty is one of the most commonly requested and performed aesthetic procedures.Our experience, from February 2007 to March 2012, is based on 214 transcutaneous lower blepharoplasty procedures in which the skin flap was sutured by means of the epidermal-dermal U stitch, a new, simple, and reliable method. Patients were followed up for a mean period ranging from 7 to 70 months. To our knowledge, the literature proposes a single-stitch closure or continuous suture in transcutaneous lower blepharoplasty using nylon or silk 4-5-0 to close the skin incision (1-3-5). According to our experience before 2007 based on patients' reports, single-stitch subciliary suture removal is a source of stress for the patient that causes anxiety, discomfort, and pain.Thus, in February 2007, following transepithelial lower blepharoplasty, we started using a new, simple way to suture the subciliary skin flap adopting the epidermal-dermal U nylon 5-0 stitch to avoid any discomfort and drastically reduce the level of anxiety and pain at the time of suture removal. According to our experience, the healing of the wound does not require any subsequent scar revision resulting from healing defects or pathological scar tissue; the complication rate in our series is in keeping with that reported by other authors in the literature.In conclusion, our experience indicates that the suture technique we describe is an easily reproducible, rapid, discomfort-free, and painless means of removing stitches. PMID:24036781

De Vita, Roy; Buccheri, Ernesto Maria



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

PubMed Central

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.

Barranco-Piedra, Sebastian; Rodriguez-Caballero, Angela; Serrera-Figallo, Maria-Angeles; Segura-Egea, Juan-Jose; Gutierrez-Perez, Jose-Luis



Uterine compression sutures for postpartum hemorrhage: an overview.  


In 1997, B-Lynch pioneered the use of uterine compression sutures for postpartum hemorrhage. Since then, some researchers, including ourselves, have devised various uterine compression sutures. High-level evidence has not been demonstrated as to whether compression sutures achieve better and safer hemostasis for postpartum hemorrhage than other methods, and, if they do, whether one suture is more efficient and safer than another. However, generally speaking, uterine compression sutures have achieved hemostasis while preserving fertility in many women and thus their efficacy and safety have been time-tested. Each suture has both merits and drawbacks: obstetricians must be aware of the fundamental characteristics of various sutures. In this review, we summarize the technical procedures, efficacy, safety and complications of various uterine compression sutures. We add our own experiences and opinions where necessary. PMID:23330882

Matsubara, Shigeki; Yano, Hitoshi; Ohkuchi, Akihide; Kuwata, Tomoyuki; Usui, Rie; Suzuki, Mitsuaki



Histopathological evaluation of rotation sutures for involutional entropion.  

PubMed Central

Rotation sutures are a popular method of temporarily correcting involutional entropion. The permanence of the procedure depends on a fibrotic scar along the suture tracks. Sutures which create generous scars would probably produce the most satisfactory results. In this study 4-0 chromic gut, nylon, and silk sutures were evaluated in rabbit lower eyelids for their ability to create histologically demonstrable fibrous tracks. All three sutures incited inflammatory cells and fibroblastic activity with collagen formation at two and four weeks. Residual scar tracks were observed at six weeks (two weeks after suture removal) also. Human specimens showed similar types of scar formation from the sutures. It was apparent that all three sutures create fibrotic scars along their tracks sufficient to correct, at least temporarily, involutional entropion. Images

Seiff, S R; Kim, M; Howes, E L



21 CFR 878.5030 - Natural nonabsorbable silk surgical suture.  

Code of Federal Regulations, 2010 CFR

... false Natural nonabsorbable silk surgical suture. 878.5030 Section 878...GENERAL AND PLASTIC SURGERY DEVICES Surgical Devices § 878.5030 Natural nonabsorbable silk surgical suture. (a) Identification....



21 CFR 878.5030 - Natural nonabsorbable silk surgical suture.  

Code of Federal Regulations, 2013 CFR

... false Natural nonabsorbable silk surgical suture. 878.5030 Section 878...GENERAL AND PLASTIC SURGERY DEVICES Surgical Devices § 878.5030 Natural nonabsorbable silk surgical suture. (a) Identification....



21 CFR 878.4495 - Stainless steel suture.  

Code of Federal Regulations, 2013 CFR

...GENERAL AND PLASTIC SURGERY DEVICES Surgical Devices § 878.4495 Stainless a needled or unneedled nonabsorbable surgical suture composed of 316L stainless...Special Controls Guidance Document: Surgical Sutures; Guidance for Industry and...



21 CFR 878.5020 - Nonabsorbable polyamide surgical suture.  

Code of Federal Regulations, 2013 CFR

...2013-04-01 false Nonabsorbable polyamide surgical suture. 878.5020 Section 878... GENERAL AND PLASTIC SURGERY DEVICES Surgical Devices § 878.5020 Nonabsorbable polyamide surgical suture. (a) Identification....



21 CFR 878.4930 - Suture retention device.  

Code of Federal Regulations, 2013 CFR

... MEDICAL DEVICES GENERAL AND PLASTIC SURGERY DEVICES Surgical Devices § 878.4930 Suture retention device. (a...retention device is a device, such as a retention bridge, a surgical button, or a suture bolster, intended to aid wound...



21 CFR 878.5030 - Natural nonabsorbable silk surgical suture.  

Code of Federal Regulations, 2010 CFR

... false Natural nonabsorbable silk surgical suture. 878.5030 Section 878...GENERAL AND PLASTIC SURGERY DEVICES Surgical Devices § 878.5030 Natural nonabsorbable silk surgical suture. (a) Identification....



Structural heterogeneity and stress distribution in carbon fiber monofilament as revealed by synchrotron micro-beam X-ray scattering and micro-Raman spectral measurements  

Microsoft Academic Search

The Raman band shift has been measured under tension for carbon fiber (CF) monofilaments of different structural heterogeneity as characterized by a synchrotron micro-beam X-ray diffraction measurement. The apparent Raman band shift factor or the band shift caused by an application of bulk tensile stress 1GPa was found to be larger for the CF fiber with the higher modulus or

Takayuki Kobayashi; Kazunori Sumiya; Yoshinori Fukuba; Masaki Fujie; Takayuki Takahagi; Kohji Tashiro



Advances in Suture Material for Obstetric and Gynecologic Surgery  

PubMed Central

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.

Greenberg, James A; Clark, Rachel M



Arthroscopic Rotator Cuff Repairs Using Suture Anchors  

Microsoft Academic Search

Arthroscopic rotator cuff repairs using titanium-alloy suture anchors are a new treatment option for active patients with shoulder injuries. Shoulder arthroscopy and arthroscopic repair procedures are alternative treatments to traditional open surgical procedures for Bankart lesions and rotator cuff tears. Distinct advantages of arthroscopic repair techniques include decreased patient tissue trauma and morbidity rates and shortened recovery and rehabilitation periods.

Lee Anna Farrall



The ultimate strength of suture anchors  

Microsoft Academic Search

Suture anchors of various designs are gaining acceptance for open and arthroscopic procedures. The rapid proliferation of these devices challenges those using them to apply objective criteria for device selection. Comparative data on implant security in different settings, modes of failure, and ultimate failure strengths is lacking. This study was undertaken to independently develop such data for an objective comparison

F. Alan Barber; Morley A. Herbert; James N. Click



Comparison of healing process following ligation with sutures and bipolar vessel sealing.  


Local hemostasis is critical for successful surgical intervention and may be accomplished with a variety of techniques ranging from direct pressure to lasers. Critical assessment of the clinical situation is required to determine the appropriate technology necessary to achieve effective hemostasis. As a general rule, ligatures remain the mainstay for effecting hemostasis in all but the smallest isolated vessels. Although ligatures have been in use since the first century AD, both the applications as well as their sophistication have increased dramatically. As sutures are foreign material to the human body, tissue reaction is unavoidable. This response may be mitigated, but not eliminated completely, through the use of non-absorbable sutures. The body's inflammatory response triggers a complex cascade of cellular and biochemical events that lead to fibrinogenesis and coagulation. This process, in turn, results in an increased deposition of collagen that may result in formation of adhesions. PMID:12384863

Peterson, Steven L; Stranahan, Patricia L; Schmaltz, Dale; Mihaichuk, Carolyn; Cosgriff, Ned



Induced Premaxillary Suture Fusion: Class III Malocclusion Model  

Microsoft Academic Search

The etiology of class III malocclusion remains unknown. The present study investigates the relationship between craniofacial morphology and premaxillary suture fusion to test the hypothesis that class III malocclusion may be related to premaxillary suture fusion. Cyanoacrylate was applied to immobilize the left premaxillary suture in the experimental group. Sham surgeries in rats were used for controls. Dental impressions and

W. H. Ruan; J. N. Winger; J. C. Yu; J. L. Borke



Rectus muscle recession and resection without scleral sutures  

Microsoft Academic Search

Purpose: To eliminate the risk of scleral perforation during strabismus surgery in susceptible patients, we introduce a technique to allow predictable rectus muscle recession and resection without the placement of scleral sutures. Methods: Three patients with thin sclera underwent rectus muscle surgery by use of a double-arm suture technique that avoids placement of sutures directly into the sclera. Two of

David K. Coats; Evelyn A. Paysse



Differential activation of canonical Wnt signaling determines cranial sutures fate: a novel mechanism for sagittal suture craniosynostosis.  


Premature closure of cranial sutures, which serve as growth centers for the skull vault, result in craniosynostosis. In the mouse posterior frontal (PF) suture closes by endochondral ossification, whereas sagittal (SAG) remain patent life time, although both are neural crest tissue derived. We therefore, investigated why cranial sutures of same tissue origin adopt a different fate. We demonstrated that closure of the PF suture is tightly regulated by canonical Wnt signaling, whereas patency of the SAG suture is achieved by constantly activated canonical Wnt signaling. Importantly, the fate of PF and SAG sutures can be reversed by manipulating Wnt signaling. Continuous activation of canonical Wnt signaling in the PF suture inhibits endochondral ossification and therefore, suture closure, In contrast, inhibition of canonical Wnt signaling in the SAG suture, upon treatment with Wnt antagonists results in endochondral ossification and suture closure. Thus, inhibition of canonical Wnt signaling in the SAG suture phenocopies craniosynostosis. Moreover, mice haploinsufficient for Twist1, a target gene of canonical Wnt signaling which inhibits chondrogenesis, have sagittal craniosynostosis. We propose that regulation of canonical Wnt signaling is of crucial importance during the physiological patterning of PF and SAG sutures. Importantly, dysregulation of this pathway may lead to craniosynostosis. PMID:20547147

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



Effect of suture material on platelet deposition onto prosthetic material  

SciTech Connect

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

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



[Suture-free amniotic membrane transplantation].  


Amniotic membrane transplantation has been used very successfully in ophthalmology since the 1940s for treatment of surface disorders. Over the course of the years the indications for use have been continuously extended. In contrast the operative technique is predominantly invasive, i.e. the amniotic membrane is surgically sutured onto the surface of the eye. In order to avoid surgical trauma the authors have developed a device which allows the amniotic membrane to be stretched in a ring and the amniotic ring can then be placed suture-free on the eye surface. The authors are hopeful that the biological principle of the amniotic membrane can be better utilized by uncomplicated repetitive application. PMID:23681176

Engelmann, K; Kotomin, I; Knipper, A; Werner, C



Drill string shock absorber  

Microsoft Academic Search

A telescopic shock absorber for use in a drill string includes a resilient arrangement to cushion telescopic contraction and extension of the shock absorber in response to shock loads and vibrations imparted during drilling. The shock absorber operates independently of the drilling fluid pressure conducted through the structure during drilling operations. A dampening system assists in cushioning the shock loads

E. A. Anderson; D. D. Webb



Development of secondary unilateral coronal suture synostosis with a sagittal suture synostosis in a nonsyndromic patient.  


Multiple-suture synostosis is typically associated with syndromic craniosynostosis but has been occasionally reported in large series of nonsyndromic children. The diagnosis of multiple fused sutures usually occurs at the same time, but rarely has the chronological development of a secondary suture synostosis been noted. The development of secondary bicoronal suture synostosis requiring surgical intervention has only been reported, to date, after surgical intervention and is hypothesized to arise from a disruption of inhibitory factors from the dura. The disinhibition of these factors permits the sutures to then fuse at an early stage. The authors report on a patient who developed secondary unilateral coronal synostosis after the diagnosis of an isolated sagittal synostosis. The secondary synostosis was identified at the time of the initial surgical intervention and ultimately required a second procedure of a frontoorbital advancement. The clinical appearance of this phenomenon may be subtle, and surgeons should monitor for the presence of secondary synostosis during surgery as it may require intervention. Failure to identify the secondary synostosis may necessitate another surgery or result in a poor cosmetic outcome. The authors recommend close clinical follow-up for the short term in patients with isolated sagittal synostosis. PMID:22295913

Rangel-Castilla, Leonardo; Hwang, Steven W; Jea, Andrew; Whitehead, William E; Curry, Daniel J; Luerssen, Thomas G; Dauser, Robert C



Continuous SiC-based model monofilaments with a low free carbon content: Part II From the pyrolysis of a novel copolymer precursor  

Microsoft Academic Search

Quasi stoichiometric model SiC monofilaments (C\\/Si atomic ratio ? 1.02) with still some free carbon (?3 mol%) and residual\\u000a oxygen have been produced from a novel copolymer precursor, itself prepared from methylphenyldichlorosilane and 2,4-dichloro-2,4-disilapentane.\\u000a The continuous green fibre was melt spun at 230C, cured by electron-beam irradiation, and pyrolysed under argon at temperatures,\\u000a Tp, in the range 1000–1600C. The fibre

A. TAZI HEMIDA; R. PAILLER; R. NASLAIN; J. P Pillot; M Birot; J Dunogues



Bioactivity of degradable polymer sutures coated with bioactive glass.  


Novel bioactive materials have been prepared by coating violet resorbable Vicryl sutures with a bioactive glass powder derived from a co-precipitation method. Two techniques have been chosen for the composite preparation: pressing the sutures in a bed of glass powder and slurry-dipping of sutures in liquid suspensions of bioactive glass powders. The uniformity and thickness of the coatings obtained by the two methods were compared. The bioactivity of the sutures with and without bioactive glass coating was tested by soaking in an inorganic acellular simulated body fluid (SBF). The composite sutures were characterised by XRD, SEM and FTIR analyses before and after soaking in SBF solution to assess the formation of hydroxyapatite on their surfaces, which is a qualitative measure of their bioactivity. The possible use of bioactive sutures to produce tissue engineering scaffolds and as reinforcement of resorbable calcium phosphates is discussed. PMID:15477741

Bretcanu, Oana; Verné, Enrica; Borello, Luisa; Boccaccini, Aldo R



The premaxillary-maxillary suture and orthodontic mechanotherapy.  


Even though there has been debate over whether a separate premaxilla exists in the human being, it has been suggested that the premaxillary-maxillary suture remains patent into adolescence and provides an explanation for the action of certain orthodontic and orthopedic appliances. To assess whether this suture is pertinent to an understanding of appliance effects, the skulls of 50 subadult subjects were scrutinized to determine patency with regard to age. Remnants of a premaxillary-maxillary suture may be present on the surface of the palate at all ages studied, and often this suture extends deep to the surface. However, in no case was the suture continuous so as to distinguish a distinct premaxilla. These findings disprove the claim that the premaxillary-maxillary suture system provides an explanation for any form of orthodontic or orthopedic therapy. PMID:1986516

Behrents, R G; Harris, E F



Methods for absorbing neutrons  

SciTech Connect

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.

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



Heterochrony and patterns of cranial suture closure in hystricognath rodents  

PubMed Central

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.

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



Response of zygomaticomaxillary suture to experimental malocclusion in rats.  


The purpose of this study was to examine the response of the zygomaticomaxillary suture (ZMS) to experimental malocclusion in rats. Thirty-two male Wistar rats were divided into two groups. Malocclusion was produced in the experimental group (n = 20) by gluing a wire, 1 mm in diameter, on the upper left first molar. Duration of the procedure was 20 min. In the control group (n = 12), rats were forced to open their mouths for the same time as in the experimental group. Histomorphological changes of the ZMS were examined at intervals of 1, 2, 4 and 8 weeks. The specimens were stained with hematoxylin-eosin and Mallory's azan. The suture in the control group showed a regular functional arrangement of component fibers, and osteoblasts lined the periphery of new bone at the inner half of the suture. On the untreated side in the experimental group, osteoclasts were most abundant after 2 weeks. Histomorphometric quantification of the sutural width revealed that, at the inner half of the suture, the width of the sutural space on the treated side in the experimental group was greater than that in the control group after 4 weeks (p < 0.05). The argyrophilic nucleolar organizer region (AgNOR) technique was used to investigate the transcriptional activity of fibroblasts in the suture. At the inner half of the suture, the number of AgNORs on the untreated side in the experimental group was greater than that on the treated side and that in the control group after 2 weeks (p < 0.05). Around the tip of the suture and at the outer half of the suture, there was no appreciable difference in the AgNOR number between the experimental and control groups. It was concluded that unilateral changes in occlusion had different effects on the treated and untreated sides of the ZMS. Moreover, the inner and outer halves of the suture showed different histological changes in response to experimental malocclusion. PMID:10765024

Kasahara, T



Heat absorbing window  

Microsoft Academic Search

A heat absorbing window is disclosed which can receive solar energy and transmit the illumination part of the solar energy, while utilizing the heat part of such energy to provide a source of heat for useful purposes. The window includes a frame with three window panes. The outermost pane faces the exterior and is of non-heat absorbing material. The middle




Work of flexion after tendon repair with various suture methods  

Microsoft Academic Search

After flexor tendon repair there is often increased resistance to tendon gliding at the repair site, which is greater for techniques using increased suture strands or suture material. This increased “friction” may be measured as the “work of flexion” in the laboratory setting. Tendon repairs performed in zone 2 in human cadaver hands using the two strand Kessler, the lateral

M. Aoki; P. R. Manske; D. L. Pruitt; B. J. Larson



Electrospun drug-eluting sutures for local anesthesia.  


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

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




Microsoft Academic Search

In an animal model we determined the strength of anterior cruciate ligaments (ACL) after section and repair by four different methods and compared it with that of the intact ligament. The standard suturing technique of multiple loops through the ligament stumps was used. Stronger suture material did not give a stronger repair. Wrapping a fine polyester mesh around the ligament



Suture Foreign Body Granuloma Masquerading as Renal Neoplasm  

Microsoft Academic Search

Foreign body granulomas and pseudotumors due to retained surgical linen are well known in surgical practice. These lesions usually correspond to the actual size of residual foreign body and have characteristic presentation according to the anatomy involved. Renal suture granuloma is a rare postoperative complication of renal surgery due to persistence of sutures used to close the pelvicalyceal system\\/nephrotomy incisions

P. N. Dogra; S. Tandon; M. S. Ansari; Anupama; P. Chopra



Structural grafts and suture techniques in functional and aesthetic rhinoplasty  

PubMed Central

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.

Gassner, Holger G.



Scar tissue orientation in unsutured and sutured corneal wound healing  

Microsoft Academic Search

AIMS--This study aimed to evaluate stromal wound healing morphology in short term unsutured compared with sutured corneal wounds, to define regional variation in healing within radial keratotomy wounds. METHODS--Stromal scar tissue orientation (fibroblast and collagen fibre orientation) was analysed in unsutured and adjacent sutured keratotomy wounds in monkeys, 2 to 9 weeks after surgery, using light and transmission electron microscopy.

G. R. J. Melles; P. S. Binder; W. Houdijn Beekhuis; R. H. J. Wijdh; M. N. Moore; J. A. Anderson; N. SundarRaj



Electrospun Drug-Eluting Sutures for Local Anesthesia  

PubMed Central

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.

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



Everting suture correction of lower lid involutional entropion  

Microsoft Academic Search

AIMSTo assess the long term efficacy of everting sutures in the correction of lower lid involutional entropion and to quantify the effect upon lower lid retractor function.METHODSA prospective single armed clinical trial of 62 eyelids in 57 patients undergoing everting suture correction of involutional entropion. Patients were assessed preoperatively and at 6, 12, 24, and 48 months postoperatively. The main

Mark Wright; Dugald Bell; Chris Scott; Brian Leatherbarrow



The double-loop technique for meniscal suture.  


The authors describe a modified method for arthroscopic meniscal repair in which polydioxanone sutures are placed in the torn meniscus using needles and nylon loops. Conventional methods require the use of expensive instruments, which are not always available. However, our method is fast and simple. This technique also simplifies inserting multiple sutures to achieve adequate stability of the torn meniscus. PMID:12368796

Bender, Benjamin; Shabat, Shay; Mann, Gideon; Oz, Hadar; Adar, Eliyahu



Loop Suture Technique for Optional Adjustment in Strabismus Surgery  

PubMed Central

Purpose: To describe a loop suture technique that allows intraoperative conjunctival closure and later optional suture adjustment in strabismus surgery in uncooperative patients. Materials and Methods: This retrospective case series comprised 25 patients. After a recessed or resected horizontal muscle was secured to the sclera with a primary suture suspended back 2 mm, a second loop suture was passed through the body of the muscle and under the primary suture knot. The loop suture could be removed later while the patient was awake, or it could be tied to advance the muscle. Success was defined as a residual deviation of 10 prism diopters (PD) or less at 2 months postoperatively. Results: In the study cohort, 20 patients had successful alignment at 2 months (80%). Six patients (24%) underwent postoperative suture tightening by the loop technique, and each muscle affected the alignment an average of 7.7 PD (±3.8 PD). No patients underwent a reoperation within the first 2 months. One patient had a pyogenic granuloma (4%). Conclusions: The loop suture technique permits optional postoperative tightening of muscles and avoids sedation in children or uncooperative patients not requiring adjustment.

Parikh, Rishi K.; Leffler, Christopher T.



Behavior of sutures used in anterior cruciate ligament reconstructive surgery  

Microsoft Academic Search

This study was performed to determine the material properties of sutures commonly used in orthopedic surgery in order to allow selection of the most appropriate one for securing a hamstring or quadriceps tendon graft in anterior cruciate ligament (ACL) reconstruction. Three suture materials (number 5 Ticron, number 5 Ethibond, and 5 mm Mersilene tape) were tested. The ultimate tensile load

E. E. Spencer; H. R. Chissell; J. T. Spang; J. A. Feagin Jr



Complications of Bioabsorbable Suture Anchors in the Shoulder  

Microsoft Academic Search

The development of the suture anchor has played a pivotal role in the transition from open to arthroscopic techniques of the shoulder. Various suture anchors have been manufactured that help facilitate the ability to create a soft tissue to bone repair. Because of reported complications of loosening, migration, and chondral injury with metallic anchors, bioabsorbable anchors have become increasingly used

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



Premaxillary-Maxillary Suture Asymmetry in a Juvenile Gorilla  

Microsoft Academic Search

A specimen of juvenile gorilla was found that had the premaxillary-maxillary suture coursing between the lateral deciduous incisor and deciduous canine on one side of the jaw, but between the central and lateral deciduous incisors on the other; in the latter, the suture also separates the alveolus of the lateral deciduous incisor from the crypt of the growing successional lateral

Jeffrey H. Schwartz



Biomechanics of the rostrum and the role of facial sutures  

Microsoft Academic Search

The rostrum is a large diameter, thin- walled tubular structure that receives loads from the teeth. The rostrum can be conceptualized both as a rigid structure and as an assemblage of several bones that interface at sutures. Using miniature pigs, we measured in vivo strains in rostral bones and sutures to gain a better understanding of how the rostrum behaves

Katherine L. Rafferty; Susan W. Herring; Christopher D. Marshall



Induced premaxillary suture fusion: class III malocclusion model.  


The etiology of class III malocclusion remains unknown. The present study investigates the relationship between craniofacial morphology and premaxillary suture fusion to test the hypothesis that class III malocclusion may be related to premaxillary suture fusion. Cyanoacrylate was applied to immobilize the left premaxillary suture in the experimental group. Sham surgeries in rats were used for controls. Dental impressions and radiographs were taken before and after surgery for comparison of craniofacial differences between groups. Overall cranial base lengths, craniofacial widths, and craniofacial angulations related to the anterior base showed significant differences between groups. At the end of the experiment, the growth of the snout in the experimental group was inhibited and deviated to the treated side, while no obvious change was seen in the control group. The results show that induced premaxillary suture fusion can affect craniofacial morphology and indicate that premature premaxillary suture fusion may result in class III malocclusion. PMID:18719213

Ruan, W H; Winger, J N; Yu, J C; Borke, J L



Internal absorber solar collector  


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 in elevation angle by or more in the azimuth sectors with a collector concentration ratio of approximately 3.0. Miniaturized construction of the circular dielectric rods with internal absorbers reduces the weight per area of glass, plastic and metal used in the collector panels. No external parts or insulation are needed as heat losses are low due to partial vacuum or low conductivity gas surrounding heated portions of the collector. The miniature internal absorbers are generally made of solid copper with black selective surface and the collected solar heat is extracted at the collector ends by thermal conductivity along the absorber rods. Heat is removed from end fittings by use of liquid circulants. Several alternate constructions are provided for simplifying collector panel fabrication and for preventing the thermal expansion and contraction of the heated absorber or circulant tubes from damaging vacuum seals. In a modified version of the internal absorber collector, oil with temperature dependent viscosity is pumped through a segmented absorber which is now composed of closely spaced insulated metal tubes. In this way the circulant is automatically diverted through heated portions of the absorber giving higher collector concentration ratios than theoretically possible for an unsegmented absorber.

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



/sup 125/I Vicryl suture implants as a surgical adjuvant in cancer of the head and neck  

SciTech Connect

Sixty-four intraoperative /sup 125/I seed implants using absorbable suture (Vicryl) carriers were performed in 53 patients with head and neck cancers at Stanford between 1975 and 1980. In previously untreated patients, local control in the implanted volume or in all head and neck sites was obtained in 79 and 71%, respectively. Of 34 patients with recurrent carcinomas, local control was obtained in the implant volume in 20 (59%), while 38% had no recurrence post-implantation in any head and neck site. The incidence of complications is correlated with /sup 125/I radiation doses, total millicuries inserted, seed strength used, and tissue volume implanted for both untreated patients and those with local recurrences. Guidelines for the optimal use of the above 4 parameters are also presented. The authors conclude that /sup 125/I seed Vicryl intraoperative suture implants are an effective surgical adjuvant in the treatment of advanced, previously untreated or recurrent head and neck cancers.

Goffinet, D.R.; Martinez, A.; Fee, W.E. Jr.



Radar Absorbing Material Design.  

National Technical Information Service (NTIS)

Low observable platforms have extremely low radar cross section specifications that cannot be achieved by shaping alone. The application of radar absorbing material is necessary, in which case the appropriate constitutive parameters and thickness must be ...

C. K. Yuzcelik



Readjusting the loop tension for resolving postoperative urination difficulties and recurrent stress incontinence after stamey suspension of the vesical neck  

Microsoft Academic Search

Excessive tension of the vesical neck sutures produces postoperative urinary retention or difficulties in urination after anti-stress urinary incontinence operations. We have demonstrated that these complications after the Stamey operation and its modifications can be resolved by readjusting the suspending loops to an adequate tension under local anesthesia, since these operations use non-absorbable monofilament loops for the suspension of the

T. Araki; H. Takamoto; H. Fujimoto; M. Koga; T. Hara



Arthroscopic coracoclavicular ligament reconstruction using biologic and suture fixation.  


Presented in this report is a modified arthroscopic approach to acromioclavicular joint reconstruction via suture and allograft fixation. An arthroscopic approach is used to expose the base of the coracoid by use of electrocautery. After an open distal clavicle excision is performed, clavicular and coracoid tunnels are created under arthroscopic visualization as previously described by Wolf and Pennington. The myotendinous end of a semitendinosus allograft is sutured to a Spider plate (Kinetikos Medical, San Diego, CA). The tendinous end of the graft is prepared with a running baseball stitch. A Nitinol wire with a loop end (Arthrex, Naples, FL) is used to pass 2 free FiberTape sutures (Arthrex) and the leading sutures from the tendinous end of the graft through the clavicular and coracoid tunnels, exiting out the anterior portal. One of the FiberTape sutures is retrieved with a grasper and passed over the anterior aspect of the distal clavicle. The second FiberTape suture and the allograft are passed over the distal end of the resected clavicle. While the acromioclavicular joint is held reduced, the FiberTape sutures are tied to the plate and the allograft is tensioned medially until the plate is embedded against the superior surface of the clavicle. The tendinous end of the graft is secured to the superior surface of the clavicle with a Bio-tenodesis screw (Arthrex) medial to the clavicular tunnel. PMID:17637416

Pennington, William T; Hergan, David J; Bartz, Brian A



Suturing complete radial tears of the lateral meniscus.  


Lateral meniscus (LM) with complete radial tear (CRT) is common in patients with acute anterior cruciate ligament (ACL) injury. We have been approximating unstable LM CRT in an all-inside suture fashion. We report 3 cases of complete healing of such a torn meniscus on second-look arthroscopy. We recommend approximation of the displaced CRTs of the LM whenever possible because we expect improved healing with this approach. Surgically, the arthroscope is placed into the anteromedial portal and the suture hook into the anterolateral portal with the knee in figure-of-4 position. A suture hook loaded with Ethilon No. 1 (Ethicon, Somerville, NJ) is introduced into the anterolateral portal, and vertical penetration to a single end of the torn LM is achieved. The Ethilon is pushed out until the far-end limb is almost exhausted. The suture hook is removed from the portal, with caution taken not to pull out the penetrated limb from the meniscus. A universal cannula is introduced, and the leading limb is grasped and pulled out. The Ethilon is used as a shuttle relay and is changed to polydioxanone (PDS) II. The suture hook is reintroduced, and the other torn end is penetrated in the same fashion. With complete suture to both meniscal sides, 2 suture limb ends are pulled out, and arthroscopic tying (SMC knot) is performed. PMID:17986421

Yoo, Jae Chul; Ahn, Jin Hwan; Lee, Seok Hyun; Lee, Sang Hak; Kim, Jae Hoon



Review of Radar Absorbing Materials.  

National Technical Information Service (NTIS)

Radar is a sensitive detection tool and since its development, methods for reducing microwave reflections have been explored. Radar absorbers can be classified as impedance matching or resonant absorbers. Radar absorbing materials are made from resistive ...

P. Saville



Suture Granuloma Mimicking Recurrent Thyroid Carcinoma on Ultrasonography  

PubMed Central

Although high resolution ultrasonography (US) is helpful in the differentiation of suture granulomas from recurrent thyroid cancer in most cases, a definite diagnosis cannot always be made. We report a case that mimicked recurrent thyroid cancer on US and 2-[fluorine-18] fluoro-2-deoxy-D-glucose (FDG) positron emission tomography (PET), but diagnosis of a suture granuloma was confirmed by a US-guided fine needle aspiration biopsy (FNAB). In order to avoid unnecessary operations, the differential diagnosis between postoperative suture granulomas and recurrent cancer is important.

Chung, Yong Eun; Kim, Min Jung; Yun, Mijin; Hong, Soon Won



Scleral necrosis secondary to nonabsorbable suture following ptosis surgery.  


We report a unique case of persistent scleral ulceration in a 68-year-old woman who developed eye redness, pain, and photophobia 2 days following external levator advancement with nonabsorbable suture. Slit-lamp biomicroscopy revealed an area of scleral ulceration superonasal to the limbus. The patient was treated with 6 months of topical steroids with some improvement in her condition but without complete resolution. An exposed suture or foreign body was never directly visualized; however, a mobile nodule was noted upon palpation of the eyelid. Subsequent surgical eyelid exploration revealed a retained polypropylene suture, which was dissected free and removed. Postoperatively, the area of scleral ulceration resolved completely. PMID:23274808

Meghpara, Beeran; Lee, Seongmu; Yen, Michael T



Reaction of the urinary tract to polypropylene sutures.  


Cystotomies were performed on 99 mature guinea pigs and closed with polypropylene sutures. The bladders were removed at intervals from day 4 through day 144 postoperatively. They were studied with both light and electron microscopy. A localized mild, acute, inflammatory reaction was noted transitorily; it subsided between the 7th and 14th day. Three calculi were formed, a result which compares favorably with studies of other sutures. Results indicate that the suture may have a place in urologic surgery, but further studies are necessary before clinical use. PMID:783077

Bartone, F F; Stinson, W



The Paleotethys suture in Central Iran  

NASA Astrophysics Data System (ADS)

The Triassic rocks of the Nakhlak area have been used to justify the hypothesis of the rotation of the Central-East Iranian microplate, mainly based on paleomagnetic data. Davoudzadeh and his coworkers (1981) pointed out the existing contrast between the Nakhlakh succession and the time-equivalent lithostratigraphic units exposed in the surrounding regions and compared them with the Triassic rocks of the Aghdarband area on the southern edge of the Turan plate. We recently gathered evidences that this part of central Iran effectively belongs to the Northern Iranian Paleo-Tethys suture zone and related Variscan terrains of the Turan plate. This is the case for the northwestern part of central Iran, where the Anarak-Khur belt (Anarak schists and their thick Cretaceous-Paleocene sedimentary cover) presents all the elements of an orogenic zone such as dismembered ophiolites and silisiclastics, calcareous and volcanic cover which has been deformed and metamorphosed. This belt is separated to the northwest from the Alborz microcontinent by the Great Kavir fault and Cretaceous ophiolite mélanges. To the southeast it is bounded by the Biabanak fault and serpentinites and the Biabanak block, part of the central-east Iranian plate. The later zone is formed by Proterozoic metamorphic basement and marine sedimentary cover, nearly continuous from the Ordovician to the Triassic, at the uppermost part upper Triassic-lower Jurassic bauxites and silisiclastics are observed. Excepted the Ordovician angular unconformities and the boundary between lower Jurassic and younger layers, this sequence displays no significant main unconformities and can be attributed to the Cimmerian super-terrain. Thus, this sequences represents the classical evolution of the southern Paleo-Tethys passive margin, as found in the Alborz microcontinent or the Band-e Bayan zone of Afghanistan and is the witness of large scale duplication of the Paleo-Tethys suture zone through major Alpine strike-slip faults. Within the Anarak-Khur belt limit and to the northeast of the Nakhlak succession, the area of Godar-e Siah of Jandaq, remnants of the Eurasian active margin are found, represented by: 1- A lower Paleozoic to upper Devonian unit consisting mainly of metamorphosed rocks including ophiolitic rocks, pelagic sediments, flysch-like deposits and shallow-water limestones of Devonian age belonging to the Anarak and Kabudan areas. Folding and thrusting was pre-Carboniferous and all geochronological dating based on K/Ar for the Anarak and Kaboudan schists placed this metamorphic event between middle Devonian and Visean. 2- the main part of the lower Carboniferous unit consists of a volcano-sedimentary complex with intercalations of limestone containing Coral, Brachiopod and Foraminiferas. Pyroclastic deposits are followed by continental red beds containing a great variety of grain types, such as hypabyssal to several types of granitoid rock fragments derived from the arc, accompanied by pebbles of chert, fossiliferous carbonate and serpentinite recycled from the accretionary complex, pointing to a fore-arc environment of deposition. 3- The middle Carboniferous to Permian unit consists of coarse littoral conglomerate and sandstones derived from ophiolitic to felsic material with some platform limestones. They represent the final infill of the fore-arc basin and rest unconformably on both the metamorphites and Lower Carboniferous units. These tectono-stratigraphic units are similar to the western Hindu Kush sequences of Afghanistan and Tuarkyr in Turkmenistan and belong to the northern active margin of Paleo-Tethys. Therefore, the Anarak-Khur belt was part of the Variscan terranes located along this margin. Volcano-sedimentary strata with Conodont-bearing limestones of Permian to Triassic age have been found in direct contact with the Biabanak fault which, therefore, is most likely following and reactivating the Paleo-Tethys suture zone.

Bagheri, S.; Stampfli, G. M.



Quantitative Analysis of Developmental Process of Cranial Suture in Korean Infants  

PubMed Central

Objective The purpose of this study was to elucidate the anatomical development of physiologic suture closure processes in infants using three dimensional reconstructed computed tomography (CT). Methods A consecutive series of 243 infants under 12 months of age who underwent three dimensional CT were included in this study. Four major cranial sutures (sagittal, coronal, lambdoidal and metopic suture) were classified into four suture closure grades (grade 0=no closure along the whole length, grade 1=partial or intermittent closure, grade 2=complete closure with visible suture line, grade 3=complete fusion (ossification) without visible suture line), and measured for its closure degree (suture closure rates; defined as percentage of the length of closed suture line divided by the total length of suture line). Results Suture closure grade under 12 months of age comprised of grade 0 (n=195, 80.2%), grade 1 (n=24, 9.9%) and grade 2 (n=24, 9.9%) in sagittal sutures, whereas in metopic sutures they were grade 0 (n=61, 25.1%), grade 1 (n=167, 68.7%), grade 2 (n=6, 24%) and grade 3 (n=9, 3.7%). Mean suture closure rates under 12 months of age was 58.8% in metopic sutures, followed by coronal (right : 43.8%, left : 41.1%), lambdoidal (right : 27.2%, left : 25.6%) and sagittal sutures (15.6%), respectively. Conclusion These quantitative descriptions of cranial suture closure may help understand the process involved in the cranial development of Korean infants.

Sim, Sook Young; Kim, Sun Yong



Modification of the Bankart reconstruction with a suture anchorReport of a new technique  

Microsoft Academic Search

We assessed the effectiveness of a new suture anchor that has been designed to anchor sutures into a blind, straight hole drilled in bone. The strength of fixation in glenoid bone is 67 N for the No. 0 anchor and suture, and 82 N for the No. 2 device with suture. During 1988 and 1989, 32 patients underwent a modified

John C. Richmond; William R. Donaldson; Freddie Fu; Christopher D. Harner



New perspectives in simulation planning of skin wound suture in plastic surgery: the integration procedure  

Microsoft Academic Search

A novel simulation method for planning a skin wound suture is proposed according to the principles of biogeometry, using a finite-element approach. The skin mesh program (CASMeD II) is used to select the suture axis and to determine the minimal distribution of the tension forces on the suture points of the suture line. The damping effect of the continuum of

G. Tritto; G. Pirlo; M. C. Tritto



Mechanical energy absorber  

NASA Astrophysics Data System (ADS)

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.

Wesselski, Clarence J.



Mechanical energy absorber  

NASA Astrophysics Data System (ADS)

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.

Wesselski, Clarence J.



[Method of suturing of the soft tissues wound].  


Method of the wound suturing, guaranteeing the plain distribution of pressure toward the soft tissues displaced and maximal usage of their elastic properties, was proposed. II-figure sutures were placed on the both edges of the wound, from the beginning--on the flaps base, then--on the middle and at last--on the edges. On the wound there were placed interrupted, continuous and other cosmetic kinds of sutures, permitting to distribute the load while approximating the wound edges along all the flaps surface, to eliminate the tension from the proper cutaneous suture for creating favorable conditions for the cosmetic cicatrix formation. The method was applied in 15 patients with vast defect of soft tissues in maxillofacial region. There were closed the irregular form defects owing from 10 to 50 cm2. PMID:16445039

Malanchuk, V A; Loganovskaia, E N; Degasiuk, L V; Iatsenko, D V



The Effect of Anchoring Sutures on Medicinal Leech Mortality  

PubMed Central

Objective: The implementation of leech therapy for surgical flaps is not always logistically easy or comfortable for patients or healthcare providers. We examine different methods of placing sutures in the medicinal leech, Hirudo medicinalis, to make the implementation of leech therapy easier. Methods: Sixteen leeches were randomly divided into 3 groups: a control group, a deep anchoring suture group, and a superficial anchoring suture group. The leeches were observed to determine if either of these methods had an adverse effect on survival compared with the control group. Results: No difference in survival time was observed across the different groups. Conclusion: The placement of anchoring sutures in leeches can ease the implementation of leech therapy by allowing for greater control of the leeches and thus increased patient comfort.

Davila, Victor J.; Hoppe, Ian C.; Landi, Rocco; Ciminello, Frank S.



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


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

Messitt, J J



Percutaneous suture of acute Achilles tendon rupture. A study of 60 cases.  


Conservative treatment of Achilles tendon ruptures may lead to re-rupture. Open surgical repair entails a risk of skin necrosis or infection. Several percutaneous techniques have been used, such as Tenolig or Achillon, but these techniques are costly and may be marred by wound healing problems. Ma and Griffith described a technique for percutaneous repair which left the suture and the knot under the skin, thus reducing the risk for infection. From January 2001 to September 2006, we used this percutaneous treatment for 60 acute ruptures of tendo Achillis. The repair was made under local anaesthesia, using a single or double absorbable suture. Postoperative care was 3 weeks immobilistion in a non-weight bearing cast in equinus position, followed by another 3 weeks in a cast with the ankle at 90 degrees and progressive weight bearing. Mean followup was 19 months. Complications were 2 re-ruptures at 2 and 5 months respectively, 1 infection in a patient who presented with re-rupture after a previous surgical treatment, and 1 Achilles tendonitis. There was no sural nerve lesion. Mean time to return to working activities was 85 days; mean time to return to sports activities was 5 months. Clinical results were good with no loss in range of motion. This low-cost technique appeared as an interesting alternative to surgical or conservative treatment, providing strong repair with a low complication rate. PMID:20503951

Rouvillain, Jean-Louis; Navarre, Thomas; Labrada-Blanco, Octavio; Garron, Emmanuel; Daoud, Wael



Suture Anchor Repair of Small and Medium Supraspinatus Tears  

Microsoft Academic Search

Arthroscopic rotator cuff repair, once the domain of a select group of surgeons, is quickly becoming the standard of care\\u000a employed by more and more orthopedists. This transformation is due in great part to the advent of improved anchors, stronger\\u000a suture material, and enhanced suture passing devices, resulting in enhanced success rates.1–4 However, the most significant advances have come about

Robert H. Bell


Differential Suture Loading in an Experimental Rotator Cuff Repair  

Microsoft Academic Search

Background: Repairs of large rotator cuff tears often fail to heal. A possible factor in these failures is excessive tension in the repair sutures, causing them to pull through the tendon.Hypothesis: Arm positions encountered during early rehabilitation after cuff repair can dramatically increase the relative tension in the different sutures of the cuff repair.Study Design: Controlled laboratory study.Methods: In a

Christopher Howe; Philippe Huber; Fredric M. Wolf; Frederick Matsen



Nasal packing and transseptal suturing techniques: surgical and anaesthetic perspectives.  


The objective of this study is to compare the nasal packing and the transseptal suturing techniques regarding the extubation difficulty evaluation scores, follow-up times in post-anaesthesia care unit (PACU), pain scores, and postoperative complications. Two hundred patients who underwent septoplasty from January 2009 to October 2009 were randomly assigned either to have nasal packs (n: 100) or transeptal sutures (n: 100). In the transseptal suture group, extubation was easier and PACU follow-up times were shorter, when compared to the nasal packing group (p < 0.001). Patients with nasal packing had significantly higher pain scores (p < 0.001). Minor bleeding was significantly higher in the transseptal group with seven cases, compared to the nasal packing group without any bleeding cases (p = 0.014). There were two patients who had postoperative major bleeding, and two patients who had septal hematoma in the transseptal suture group. One patient with nasal packing had postoperative infection. Septal perforation was not seen in any of the cases. While patients in both groups experienced postoperative crusting, patients in the transseptal suture group also complained about foreign body sensation. Extubation was more comfortable; post-anaesthesia monitorization duration was shorter, and postoperative pain was less, but minor bleeding was seen more with transseptal sutures. There was no significant difference in terms of major bleeding, hematoma, infection or perforation. Foreign body sensation was the main cause of postoperative discomfort in the transseptal suture group. Transseptal suturing might be a significantly comfortable, cost-effective and reliable alternative to nasal packing. PMID:21365212

Günayd?n, R?za Önder; Aygenc, Erdinc; Karakullukcu, Selma; Fidan, Fatih; Celikkanat, Serdar



Surgical corner. Modified buried suture technique for the scalp.  


Large surgical defects on an actinically damaged scalp are notoriously difficult to close primarily. Not only is the skin weak and friable, but the underlying bone often limits the size of "bite" that the surgeon can take with their deep suture. We describe a technique that maximizes the ability to grasp adequate deep tissue with the suture, decreasing the likelihood of tearing through the tissue when the wound edges are brought together. PMID:23839188

Hochwalt, Phillip C; Asarch, Adam; Selby, John C; VanBeek, Marta



Strength of sliding knots in multifilament resorbable suture materials.  


Experimental laboratory study was made to test the knot integrity of identical, non-identical and parallel sliding knots, with three and five throws, made with synthetic resorbable multifilament suture materials. The knots were made with Novosyn (polyglactin 612), Safil (polyglycolic acid), Vicryl (polyglactin 612) and Vicryl plus (polyglactin 910 + triclosan), all with suture size: 3-0 USP. Per material 10 knots for every kind of knot were tested in a tensiometer, resulting in a total of 240 tests. Sliding knots with three throws were compared with the five throw sliding knots, and a comparison of the loop-holding capacities (LHC) of the different suture materials was made. Differences in suture material, knot type, and number of throws in the knot had a remarkable effect on knot performance. Adding two extra throws to a three throw non-identical or parallel sliding knot resulted in significantly more reliable knots (P?suture materials, Safil showed significantly lower LHCs. Most of the mean LHCs of the various knots with Vicryl, Vicryl Plus or Novosyn were not statistically different from each other. Identical sliding knots appeared to be very unreliable, especially when made with three throws. Non-identical and parallel slipknots with five throws demonstrated superior knot integrity compared with the same knot types with three throws. Safil had inferior knot properties as compared to the other materials, but Vicryl, Vicryl Plus and Novosyn behaved virtually the same. The type of knot and the use of different suture materials have important influence on the integrity of the knot. A high knot reliability is nowadays all the more important because of the frequent use of resorbable suture materials. The suture gradually loses strength during the resorption process, so that an extra margin of safety neutralizes the effect of this process. PMID:23144642

van Leeuwen, Nourah; Trimbos, J Baptist



First investigation of spider silk as a braided microsurgical suture.  


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

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



Development of braided drug-loaded nanofiber sutures.  


The objectives of this work are twofold. Firstly, while most work on electrospinning is limited to the development of only functional materials, a structural application of electrospun nanofibers is explored. Secondly, a drug-loaded tissue suture is fabricated and its various properties are characterized. Braided drug-loaded nanofiber sutures are obtained by combining an electrospinning process with a braiding technique followed by a coating procedure. Two different electrospinning techniques, i.e. blend and coaxial electrospinning, to incorporate a model drug cefotaxime sodium (CFX-Na) into poly(L-lactic acid) (PLLA) nanofibers have been applied and compared with each other. Properties of the braided drug-loaded sutures are characterized through a variety of methods including SEM, TEM and tensile testing. The results show that the nanofibers had a preferable micromorphology. The drug was incorporated into the polymer nanofibers homogeneously, with no cross-linking. The nanofibers maintained their fibrous structures. An in vitro release study indicates that the drug-loaded nanofibers fabricated by blend electrospinning and coaxial electrospinning had a different drug release behavior. An inhibition zone experiment shows that both sutures obtained from the nanofibers of the different electrospinning techniques had favorable antibacterial properties. The drug-loaded sutures had preferable histological compatibility performance compared with commercial silk sutures in an in vivo comparative study. PMID:20622298

Hu, Wen; Huang, Zheng-Ming; Liu, Xiang-Yang



Laminoplasty using Twinfix suture anchors to maintain cervical canal expansion  

PubMed Central

Open-door laminoplasty is a commonly performed procedure for the treatment of multiple level cervical spinal stenosis. One complication of this procedure is closure of the hinge and subsequent restenosis. Twinfix suture anchor was used in laminoplasty to stabilize cervical canal expansion. 53 patients with multiple level cervical spinal stenosis underwent laminoplasty. A unilateral open-door technique was performed for the lesion level and the elevated lamina was fixed to the lateral mass using Twinfix suture anchors. Radiography, magnetic resonance imaging, and computed tomography (CT) scanning were used for imaging studies. The Japanese Orthopedic Association score was adopted to compare clinical outcome before and after surgery. None of 53 patients who had the door secured with Twinfix suture anchors had closure of the hinge. Additionally, the suture anchors maintained their position without loosening or “pull-outs” on postoperative follow-up radiographs. The Japanese Orthopedic Association score increased significantly from 8.5 ± 3.2 before surgery to 14.2 ± 1.36 at final follow-up. Postoperative radiography and CT scan demonstrated significantly increased anteroposterior diameter of the spinal canal. There were four short-term complications: two were small dural-tears which were repaired intraoperatively without further sequelae, and the other 2 were both epidural hematomas that required emergent return to the operating room for evacuation. There were no Twinfix suture anchor-related complications. This Twinfix suture anchor can provide a firm and secure anchor for elevated open laminae in laminoplasty.

Yu, Hai-long; Liu, Jun; Chen, Yu; Yu, Ming; Cao, Yan



Dietary consistency and the midline sutures in growing pigs  

PubMed Central

Objectives The purpose of this study was to investigate the effects of reduced masticatory function on midline suture growth and morphology in growing pigs. Setting and Sample Population The sample was 20 pigs separated into 2 dietary groups, and raised at the Department of Antrhopology, Harvard University. Midline suture specimes were analyzed at the Department of Orthodontics, University of Washington. Materials and Methods Ten farm pigs and 10 minipigs, all male, were randomly assigned to hard (n=9) and soft diet (n=11) groups. Fluorochromic mineral labels were administered to document bone apposition, and the animals were sacrificed after 12 weeks. Undecalcified sections of the interfrontal, interparietal, internasal and intermaxillary sutures were evaluated for bone quantity and sutural thickness, interdigitation ratio and growth rate. Results Soft diet pigs were characterized by a slower rate of weight gain, and less bone than their hard diet counterparts. Even after correction for weight gain, soft diet pigs had reduced suture growth rate and thickness. However, no difference in interdigitation ratio was detected between dietary groups. Conclusion Restriction to a soft diet reduces midline suture growth and bone apposition in the growing pig.

Burn, AK; Herring, SW; Hubbard, R; Zink, K; Rafferty, K; Lieberman, DE



Heat Resistant Radar Absorber.  

National Technical Information Service (NTIS)

A foamed ceramic slab is bonded to the three-layer polyimide RAM substrate to produce a radar absorbed capable of at least 10db absorptivity of the range 3 to at least 10 GHZ and of withstanding very high temperatures, for example, 3000 F for 80 seconds o...

W. P. Manning W. T. Passiuk



Polypyrrole Based Microwave Absorbers  

Microsoft Academic Search

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, ?'',

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



Neutron Absorbing Alloys  


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

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



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


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

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



Accelerating bone generation and bone mineralization in the Interparietal sutures of rats using an rhBMP-2/ACS composite after rapid expansion.  


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

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



Comparison of suture material and technique of closure of subcutaneous fat and skin in caesarean section  

PubMed Central

Background: A large number of women undergo caesarean section throughout the world. These women pass through a period of post operative pain and a morbidity period. These women translate into a substantial portion of population and hence there is a load on the financial resources of healthcare system. Use of the appropriate technique to approximate the wound after caesarean section would not only avoid financial load but also help in early recovery of the patient. Aim: The aim of this study is to compare the effects of alternative techniques for closure of subcutaneous fat and skin on maternal health and use of healthcare resources in caesarean section. Materials and Methods: Patients undergoing Caesarean section were divided in two groups of one thousand patients each. Patients with hematological disorders or a malignancy, diabetes, septicemia or chorioamnionitis were excluded from the study. In all the patients, after stitching the uterus, the rectus sheath was stitched with thread vicryl No.1 (synthetic absorbable braided sutures with polyglycolic acid, polycaprolactone and calcium stearate coating), using a round body needle. Then the patients were divided into two groups. In group I, vicryl No.1 thread used in stitching of the rectus sheath was continued into the skin with application of subcuticular stitches, after securing the edges with a knot. In group II, after stitching the rectus sheath with vicryl No. 1, the thread was cut and interrupted sutures were applied in subcutaneous fat with thread vicryl No. 2. Skin was stitched with subcuticular stitches using proline 2, a non-absorbable propylene suture. The two groups of patients were observed for the duration of surgery, post-operative pain in stitches, patient satisfaction about removal of stitches, evidence of wound infection or seroma, and cosmetic results. Results: It was noted that the duration of surgery in group I was on average 7.5 minutes less as compared to the duration in group II. Patients in group I were more satisfied with the results of the surgery and were relieved to know that their stitches did not need to be removed. Conclusion: Although no difference was found in the rates of wound infection and formation of scar tissue between the group I and group II, the duration of surgery was less and the patients were more satisfied in group I.

Islam, Aliya; Ehsan, Ambreen



Force-Induced Craniosynostosis in the Murine Sagittal Suture  

PubMed Central

BACKGROUND The etiology of non-syndromic craniosynostosis remains elusive. While compressive forces have been implicated in premature suture fusion, conclusive evidence of force-induced craniosynostosis is lacking. The purpose of this study was to determine if cyclical loading of the murine calvarium could induce suture fusion. METHODS Calvarial coupons from post-natal day 21, B6CBA wild-type mice (n = 18) were harvested and cultured. A custom appliance capable of delivering controlled, cyclical, compressive loads was applied perpendicular to the sagittal suture within the coupon in vitro. Nine coupons were subjected to 0.3g of force for 30 minutes each day for a total of 14 days. A control group of nine coupons was clamped in the appliance without loading. Analysis of suture phenotype was performed using alkaline phosphatase and H&E staining techniques, as well as in situ hybridization analysis using Bone Sialoprotein (BSP). RESULTS Control group sagittal sutures—which normally remain patent in mice—showed their customary histological appearance. In contradistinction, sagittal sutures subjected to cyclic loading showed histological evidence of premature fusion (craniosynostosis). In addition, alkaline phosphatase activity and BSP expression was observed to be increased in the experimental group when compared to matched controls. CONCLUSIONS An in vitro model of forced-induced craniosynostosis has been devised. Premature fusion of the murine sagittal suture was induced with the application of controlled, cyclical, compressive loads. These results implicate abnormal forces in the development of non-syndromic craniosynostosis, which supports our global hypothesis that epigenetic phenomena have a crucial role in the pathogenesis of craniosynostosis.

Oppenheimer, Adam J.; Rhee, Samuel T.; Goldstein, Steven A.; Buchman, Steven R.



Solar energy absorber  

SciTech Connect

A solar energy absorber module is described comprising a molded substantially rigid top sheet of translucent plastic material and a molded substantially rigid bottom sheet of solar energy absorbing substantially opaque plastic material bonded together by circular bond indentations formed in each of the top sheet and the bottom sheet. The circular bond indentation on each sheet is spaced from each other a distance equal to the diameter of the circular bond thereby forming convex lens-like elliptical sites located between adjacent circular bond indentations for augmentation of solar energy, the circular bond indentations being formed in successive offset rows to define longitudinal tortuous sinusoidal channels in communication with a header at each end of the module for passage of working fluid therethrough.

Smith, W.F.



New meniscus repair by an all-inside knot suture technique.  


The indications for the all-inside knot suture technique include tears in the red-red zone or red-white zone in the meniscus, and a horizontal tear, a vertical tear, and a peripheral tear. First, find an appropriate place for a suture insertion site with a Kateran needle or a spinal needle. Make sure it exits beyond the tear in the meniscus. Once the insertion site is chosen, a suture is passed into and through the joint. The suture is slowly pulled back. You should be able to feel the tip of the suture come out of the joint capsule. If you want to make a vertical suture to suture the tear, move the suture vertically apex. Then insert the suture back into the joint through the capsule. Make sure the suture stays inside the joint. Find and grab the suture with a punch inserted from the clear cannula. Pull the suture out of the joint through the clear cannula with the punch. Tighten the knot with a knot pusher. Then confirm the stability of the sutured site with the probe. Our all-inside knot suture technique can be performed arthroscopically, allowing reliable repair of the torn meniscus. PMID:15944646

Fukushima, Kazumasa; Okano, Tatsumasa; Negishi, Shinichi; Horaguchi, Takashi; Sato, Kenji; Saito, Akiyoshi; Ryu, Junnosuke



Selective laser vaporization of polypropylene sutures and mesh  

NASA Astrophysics Data System (ADS)

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.

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



A generalized mechanical model for suture interfaces of arbitrary geometry  

NASA Astrophysics Data System (ADS)

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

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



Mechanical Behavior of Bio-inspired Model Suture Joints  

NASA Astrophysics Data System (ADS)

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.

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



Corrosion resistant neutron absorbing coatings  


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.

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



Low temperature selective absorber research  

Microsoft Academic Search

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

S. A. Herzenberg; R. Silberglitt



Corrosion resistant neutron absorbing coatings  

Microsoft Academic Search

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

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



Delayed-onset endophthalmitis associated with corneal suture infections  

PubMed Central

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



Absorber for solar power.  


A simple, economical absorber utilizing a new principle of operation to achieve very low reradiation losses while generating temperatures limited by material properties of quartz is described. Its performance is analyzed and indicates approximately 90% thermal efficiency and 73% conversion efficiency for an earth based unit with moderately concentrated (~tenfold) sunlight incident. It is consequently compatible with the most economic of concentrator mirrors (stamped) or mirrors deployable in space. Space applications are particularly attractive, as temperatures significantly below 300 K are possible and permit even higher conversion efficiency. PMID:20134700

Powell, W R



Solar radiation absorbing material  


Solar energy absorbing means in solar collectors are provided by a solar selective carbon surface. A solar selective carbon surface is a microporous carbon surface having pores within the range of 0.2 to 2 micrometers. Such a surface is provided in a microporous carbon article by controlling the pore size. A thermally conductive substrate is provided with a solar selective surface by adhering an array of carbon particles in a suitable binder to the substrate, a majority of said particles having diameters within the range of about 0.2-10 microns.

Googin, John M. (Oak Ridge, TN); Schmitt, Charles R. (Oak Ridge, TN); Schreyer, James M. (Oak Ridge, TN); Whitehead, Harlan D. (Clinton, TN)



Suture suspension arthroplasty technique for basal joint arthritis reconstruction.  


Numerous techniques have been developed to address thumb basal joint arthritis. Many techniques include trapeziectomy with ligament reconstruction, most commonly performed by sacrificing a tendon that is used for ligament reconstruction and stabilization of the first metacarpal, with or without pin fixation. Harvesting a tendon for use in basal joint reconstruction is time-consuming and not without potential complications. Redirecting tendons via drill holes or anchoring tendons via suture anchors adds additional morbidity and time to the operative procedures. The authors introduce a novel technique of basal joint reconstruction, employing suture suspension for maintenance of joint arthroplasty space and stabilization of the base of the first metacarpal. PMID:19956040

DelSignore, Jeanne L; Accardi, Kimberly Z



A carpal ligament substitute part 1: polyester suture.  


We have searched for a synthetic substitute for the carpal ligaments, which would be widely available and easy to use. Four loops of 2-0 polyester fiber suture (Mersilene) were found to exceed the ultimate tensile strength of the scapholunate interosseous ligament. This construct approximates a normal ligament stress/strain curve and can theoretically facilitate fibrous tissue ingrowth. It is readily available, easy to handle, and inexpensive. Based on these findings, we recommend the use of polyester suture in the reconstruction of carpal and other ligaments. PMID:23168035

Martin, John A; Wehbé, Marwan A



Preparation of scaffolds based on bulky sutures for cell therapy  

NASA Astrophysics Data System (ADS)

Scaffold for cell therapy was prepared with poly (lactide-co-glicolide, PLA/PGA (10:90). By using melt-spinning and draw texturing process, we could prepare microfibrous bulky suture which had heterogeneous macropore. Microfibrous structure has great potentiality as biomimicking architecture for cell growth and maintaining cell functions. The result of cell seeding showed that pore size, pore distribution, and fiber fineness of sutures were suitable as a biocompatible scaffold in vitro for NIH 3T3 Fibroblast cell. Also, we expect that prepared scaffold for cell-therapy will provide numerous benefits as a noninvasive alternative for tissue engineering applications.

Park, Young Hwan; Chun, Heung Jae; Kim, Sung Jin



Safety and efficacy of barbed suture for gastrointestinal suture: a prospective and randomized study on obese patients undergoing gastric bypass.  


Abstract Background: Laparoscopic intracorporeal suturing and knot tying for anastomosis are considered the most difficult laparoscopic skills to master. The aim of this study was to establish the safety and efficacy of barbed suture for intestinal sutures to close the gastrojejunal anastomosis in obese patients undergoing gastric bypass. Study Design: All consecutive patients undergoing gastric bypass were screened for enrollment in our study. Patients were randomly allocated to undergo knotless anastomosis with barbed suture (V-Loc™ 180; Covidien, Mansfield, MA) (case group) or knot-tying anastomosis with 3/0 polyglactin sutures (Polysorb(®); Covidien) (control group). The primary outcome was the time needed for the gastrojejunal anastomosis and the operative time. The secondary outcomes were the incidence of leak, bleeding, and stenosis and the evaluation of the cost of the different procedures evaluated. Results: Among the 60 consecutive patients enrolled in our study, 30 underwent knot-tying anastomosis, and 30 underwent knotless anastomosis. The time needed for the anastomosis was significantly less (P<.001) in the knotless group, whereas no significant differences were found between the two groups for operative time (P=.151). We recorded one leak in the control group and one leak in the case group (P=1.000). One bleeding in the case group (P=1.000) and no stenosis in either group was recorded. Finally, in our experience, the knotless anastomosis was cheaper than the knot-tying anastomosis (P<.001). Conclusions: Our study appears to be encouraging to suggest the use of barbed suture for gastrointestinal anastomosis. PMID:23859743

Milone, Marco; Di Minno, Matteo Nicola Dario; Galloro, Giuseppe; Maietta, Paola; Bianco, Paolo; Milone, Francesco; Musella, Mario



A modular wideband sound absorber  

NASA Astrophysics Data System (ADS)

The absorption coefficients were measured of various depths of RW2 grade Rockwool laid directly on the floor of the ISO-Standard reverberation room at BBC Research Department. The Rockwool was very effective as a wideband sound absorber. A new absorber was designed and tested, having the dimensions of the existing BBC type A modular absorbers and containing RW2 Rockwool. The new absorber has a smoother absorption coefficient curve, a less complicated construction, and weighs less than the existing BBC wideband absorber (type A8/A9). It has been named type A11 and has an equivalent performance to that of BBC type A2 and A3 absorbers combined. It complements, very well, the performance of the A10 very low frequency absorber, described in a companion Report (BBC RD No. 1992/10).

Plumb, G. D.


A New Method for Semiautomatic Suture Plication of the Inferior Vena Cava.  

National Technical Information Service (NTIS)

A new method of rapid precise suture plication of the inferior vena cava is described. Although clinical studies have not yet been performed, results in animals have been similar to those with conventional suture plication technics with effective trapping...

I. R. Berman H. F. Hamit R. H. Clauss



21 CFR 878.5000 - Nonabsorbable poly(ethylene terephthalate) surgical suture.  

Code of Federal Regulations, 2010 CFR

...Nonabsorbable poly(ethylene terephthalate) surgical suture. 878.5000 Section 878...GENERAL AND PLASTIC SURGERY DEVICES Surgical Devices § 878.5000 Nonabsorbable poly(ethylene terephthalate) surgical suture. (a)...



21 CFR 878.5000 - Nonabsorbable poly(ethylene terephthalate) surgical suture.  

Code of Federal Regulations, 2013 CFR

...Nonabsorbable poly(ethylene terephthalate) surgical suture. 878.5000 Section 878...GENERAL AND PLASTIC SURGERY DEVICES Surgical Devices § 878.5000 Nonabsorbable poly(ethylene terephthalate) surgical suture. (a)...



Effect of circumferential sutures on tensile and gap strength of repaired canine flexor tendons  

Microsoft Academic Search

Sixty-four dog cadaver flexor digitorum profundus tendons in zone 2 were lacerated and repaired with a simple or a cross-stitch\\u000a peripheral circumferential suture in combination with two-, four-, or six-strand core sutures. The tensile and gap strengths\\u000a were compared. The range of tensile strengths with the cross-stitch circumferential suture in combination with various core\\u000a suture techniques (4.28–9.37 kgf) was significantly

Hideaki Kubota; Shunsuke Hotokezaka; Donald L. Pruitt; Paul R. Manske; Yoichi Sugioka



Anterior cruciate ligament suture in comparison with plasty  

Microsoft Academic Search

In this retrospective study we analyse the results of primary anterior cruciate ligament (ACL) sutures, primary ACL plastics and secondary ACL plastics 5 years after operation. All operations were performed with an additional PDS augmentation. Follow-ups of 100 of 130 patients could be done (80 male and 20 female). The average age at time of operation was 29.2 years. ACL

D. Träger; K. Pohle; W. Tschirner



Chordal reconstruction with polytetrafluoroethylene (PTFE) sutures for mitral regurgitation  

Microsoft Academic Search

Chordal reconstruction of the mitral valve using CV4 or CV5 polytetrafluoroethylene (PTFE) (GoreTex, Flagstaff, AZ, USA) sutures was performed in seven patients with mitral regurgitation (MR) to ascertain its efficacy. The MR had been caused by prolapse of the anterior leaflet in three patients, the posterior leaflet in two, and both leaflets in two; five of the patients had an

Hajime Maeta; Setsuro Imawaki; Yasushi Shiraishi; Ichiro Arioka; Satoshi Tanaka



Fibrin sealant as an alternative for sutures in periodontal surgery.  


The trial compared wound healing clinically, histologically and morphometrically after the use of fibrin sealant and sutures for periodontal flap closure. Ten patients were selected for this split-mouth randomized controlled clinical trial. On the test site fibrin sealant (F) was applied for flap closure after periodontal flap surgery (n = 10) and on the control site sutures (S) were used (n = 10). Clinically wound healing was observed at 7, 14 and 21 days and biopsy was taken on the 8th day. At seventh day better healing was observed in fibrin sealant site. Histologically mature epithelium and connective tissue formation was seen in fibrin sealant site with increased density of fibroblasts (F = 70.45 ± 7.22; S = 42.95 ± 4.34, p < 0.001) and mature collagen fibers. The suture site had more number of inflammatory cells (S = 32.58 ± 4.29; F = 20.91 ± 4.46, p < 0.001) and more number of blood vessels (S = 11.89 ± 3.64; F = 5.74 ± 2.41, p = 0.005). Fibrin sealant can form a better alternative to sutures for periodontal flap surgery. PMID:23374528

Pulikkotil, Shaju Jacob; Nath, Sonia



Arthroscopic repair of SLAP lesions with a bioknotless suture anchor  

Microsoft Academic Search

The diagnosis and treatment of SLAP tears have improved with the development of arthroscopic shoulder surgery techniques. With types 2 and 4 tears, the goal is to restore stability to the labrum and biceps anchor and achieve healing to the glenoid. Suture repair with anchors is currently the repair technique of choice. The purpose of this article is to report

Edward Yian; Conrad Wang; Peter J Millett; Jon J. P Warner



Seismic wavespeed images across the Iapetus and Tornquist suture zones  

NASA Astrophysics Data System (ADS)

Closures of the Iapetus Ocean and the Tornquist Sea lead to the collision of the paleocontinents of Laurentia, Baltica and Eastern Avalonia during the Caledonian orogeny. It has been speculated that relicts of these two closures may be preserved within the crust or upper mantle. Over the past decades, numerous wide-angle seismic profiles were gathered in northwestern Europe to search for related subsurface features. Although active source studies revealed detailed crustal structures across the Iapetus and Tornquist suture zones, there are relatively few clear three-dimensional upper mantle images beneath this region. We use a new European crust and upper mantle model, EU30, determined based on continental scale, nonlinear adjoint tomography, to explore upper mantle structures across these two suture zones. Model EU30 reveals two fast anomalies within the upper mantle: one dips in a northwesterly direction down to approximately 400 km beneath the North Sea, and the other dips in a southwesterly direction down to nearly 250 km across the Tornquist Suture Zone. In addition, we observe a “gap” between the lithospheres of Laurentia and Eastern Avalonia across the Iapetus Suture Zone beneath the central British Isles. These seismic images suggest that heterogeneity related to the closures of the Iapetus Ocean and the Tornquist Sea have been preserved within the upper mantle over hundreds of millions of years.

Zhu, Hejun; Bozda?, Ebru; Peter, Daniel; Tromp, Jeroen



Age-at-death estimation based on the study of frontosphenoidal sutures  

Microsoft Academic Search

Determination of age at the time of death based on the observation of cranial sutures has led to numerous studies with sometimes contradictory results. The initial hypothesis being that suture closure is part of an age-related physiological process, the conflicting results have been interpreted by various authors as secondary to the choice of sutures, under the co-existing influence of pathological

Anne Dorandeu; Béma Coulibaly; Marie-Dominique Piercecchi-Marti; Christophe Bartoli; Jean Gaudart; Eric Baccino; Georges Leonetti



A technique for adequate coverage of the proximal suture line during abdominal aortic aneurysm repair  

Microsoft Academic Search

The proximal suture line is a vulnerable area after abdominal aortic aneurysm repairs. This area has been implicated in various postoperative complications, such as pseudoaneurysm formation, graft-enteric fistula, and suture line disruption. We present a technique that provides safe and adequate coverage of this suture line by using the aneurysm sac. This technique is derived from the z-plasty technique used

Aditya K. Kaza; Jeffrey T. Cope; John A. Kern; David C. Cassada; Stewart M. Long; Steven M. Fiser; Irving L. Kron; Curtis G. Tribble



Robot-assisted laparoscopic repair of ventral hernia with intracorporeal suturing  

Microsoft Academic Search

Background: This study presents a novel technique for laparoscopic ventral hernia repair using the da Vinci Robot and intracorporeal suturing. Thus, it offers an alternative to transabdominal sutures and tackers. Methods: A ventral hernia model was created in six pigs. The mesh was fixed to the circumference of the fascia using interrupted sutures. The outer border of the mesh was

S. Schluender; J. Conrad; C. M. Divino; B. Gurland



Depth of endoscopically placed sutures: an experimental study in a human cadaver model  

Microsoft Academic Search

Background: Endoscopic suturing devices offer interesting access for interventional procedures used on the gastrointestinal tract. For the time being, the main indication is endoluminal suturing at the gastroesophageal junction for the management of gastroesophageal reflux disease. There is some evidence that endoluminal endoscopic suturing offers an alternative to the closure of esophageal fistulas and to the fixation of feeding tubes

M. Kleemann; C. Langner; A. Müldner; C. Weiss; B. C. Manegold



Brief communication: Histology and micro CT as methods for assessment of facial suture patency  

Microsoft Academic Search

The extent of fusion in facial sutures has implications for topics ranging from biomechanics to phylogeny reconstruction. An unfortunate limitation of studying sutural fusion in skeletal specimens is that it is difficult to assess whether apparently patent sutures are in fact fused internally. Both histology and microcom- puted tomography (CT) are potential tools for solving this, but relatively few studies

Lauren E. Reinholt; Anne M. Burrows; Thomas P. Eiting; Elizabeth R. Dumont; Timothy D. Smith



Absorber coatings' degradation  

SciTech Connect

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

Moore, S.W.



Metamaterial electromagnetic wave absorbers.  


The advent of negative index materials has spawned extensive research into metamaterials over the past decade. Metamaterials are attractive not only for their exotic electromagnetic properties, but also their promise for applications. A particular branch-the metamaterial perfect absorber (MPA)-has garnered interest due to the fact that it can achieve unity absorptivity of electromagnetic waves. Since its first experimental demonstration in 2008, the MPA has progressed significantly with designs shown across the electromagnetic spectrum, from microwave to optical. In this Progress Report we give an overview of the field and discuss a selection of examples and related applications. The ability of the MPA to exhibit extreme performance flexibility will be discussed and the theory underlying their operation and limitations will be established. Insight is given into what we can expect from this rapidly expanding field and future challenges will be addressed. PMID:22627995

Watts, Claire M; Liu, Xianliang; Padilla, Willie J



The microwave absorbing phenomena of ferrite microwave absorbers  

Microsoft Academic Search

The complex permeability dispersions and the microwave absorbing phenomena are investigated in ferrite microwave absorbers. The complex permeability of hexagonal (Y- and Z-type) and spinel (NiZn ferrite and NiZnCo ferrite) ferrite microwave absorbers were measured in 200 MHz-16 GHz range. The theoretical matching frequencies are determined by plotting the measured complex permeability loci on the impedance matching solution map. One

J. Y. Shin; J. H. Oh



Mucosal Excision and Suturing for Obesity and GERD.  


Background. Suture and staple-based endoluminal devices for gastroesophageal reflux disease (GERD) and obesity have failed to demonstrate long-term efficacy. Objective. To demonstrate the feasibility of mucosal excision and full-thickness suture apposition of the excision beds to create sufficient scar tissue formation at the gastroesophageal junction for the intraluminal treatment of GERD or obesity. Design. Survival animal experiments. Patients. Seven mongrel dogs. Interventions. Under general endotracheal anesthesia, a Barostat test was performed on 4 dogs. A mucosal excision device was introduced through the esophagus into the proximal stomach. Two to 4 mucosal excisions were performed on all dogs at or just below the gastroesophageal junction and the mucosal pieces were removed. After hemostasis, an intraluminal suturing instrument was introduced and either 2 or 4 sutures were placed through the excision beds to bring them into apposition. These were tied and the suture strands cut. All dogs were survived for 2 months. End-term endoscopies were performed, and a repeat Barostat procedure was performed on the animals undergoing an antireflux procedure. After euthanasia the stomachs were explanted, examined, photographed, and sectioned for histologic examination. Results. All dogs survived without complication. In the 4 GERD dogs, the Barostat studies demonstrated a significant decrease in gastroesophageal junction compliance. In the 3 dogs undergoing the obesity procedure, the gastric outlet apposition to a 6-mm endoscope was satisfactory with full insufflation and the desired scarring was seen on histologic examination. Conclusion. It is possible to create adequate gastroesophageal junction scarring for the treatment of GERD and obesity. A clinical pilot study will be initiated. PMID:23423723

Légner, András; Tsuboi, Kazuto; Stadlhuber, Rudolf; Yano, Fumiaki; Halvax, Peter; Hunt, Brandon; Penka, Wayne; Filipi, Charles J



Hands-on Activities for understanding Ammonite Sutures  

NSDL National Science Digital Library

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

Cowan, Clint


Sox9 neural crest determinant gene controls patterning and closure of the posterior frontal cranial suture.  


Cranial suture development involves a complex interaction of genes and tissues derived from neural crest cells (NCC) and paraxial mesoderm. In mice, the posterior frontal (PF) suture closes during the first month of life while other sutures remain patent throughout the life of the animal. Given the unique NCC origin of PF suture complex (analogous to metopic suture in humans), we performed quantitative real-time PCR and immunohistochemistry to study the expression pattern of the NCC determinant gene Sox9 and select markers of extracellular matrix. Our results indicated a unique up-regulated expression of Sox9, a regulator of chondrogenesis, during initiation of PF suture closure, along with the expression of specific cartilage markers (Type II Collagen and Type X Collagen), as well as cartilage tissue formation in the PF suture. This process was followed by expression of bone markers (Type I Collagen and Osteocalcin), suggesting endochondral ossification. Moreover, we studied the effect of haploinsufficiency of the NCC determinant gene Sox9 in the NCC derived PF suture complex. A decrease in dosage of Sox9 by haploinsufficiency in NCC-derived tissues resulted in delayed PF suture closure. These results demonstrate a unique development of the PF suture complex and the role of Sox9 as an important contributor to timely and proper closure of the PF suture through endochondral ossification. PMID:15882577

Sahar, David E; Longaker, Michael T; Quarto, Natalina



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

PubMed Central

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.

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



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

PubMed Central

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

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



The effect of suture material on platelet deposition onto prosthetic material.  


Previous studies have demonstrated the importance of employing prosthetic material with minimal thrombogenicity. However, the role of different suture materials in early thrombotic events on prosthetic materials has not been examined. Experiments were designed to analyze the effects of suture on platelet graft interaction using an in vivo baboon hemocompatability screen. 111Indium labeled, autologous platelet deposition was determined on expanded polytetrafluoroethylene (ePTFE) containing suture lines of polypropylene (Prolene), polybutester (Novafil), and ePTFE (Gore-Tex). A significant increase in platelet deposition was noted not only at the suture line, but proximal and distal to it as well. The results were different for each of the sutures employed and suggest that the suture line may influence early platelet deposition in the perianastomotic region, not only at the suture line, but proximally and distally as well. PMID:3196613

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


Shock Absorbers - Are They Necessary?  

Microsoft Academic Search

The economic benefits of running a shock absorber seem evident from their growing use in oil and gas drilling operations. However, some controversy still exists over when they should be used, how to get the greatest benefit from them, and whether there are some negative effects such as hole deviation associated with the usage of some shock absorbers. Extensive experience

S. W. Worford; P. G. Craig



Sutured piggyback toric intraocular lenses to correct high astigmatism.  


A 74-year-old woman presented for bilateral cataract surgery, which was performed 3 days apart. Corneal astigmatism was 4.25 diopters (D) in the right eye and 4.87 D in the left. After cataract extraction through 6.0 mm scleral incisions, 2 toric, plate-haptic, silicone intraocular lenses (IOLs), each with a 3.50 D cylinder add power (2.30 D at spectacle plane), were sutured together and implanted in the bag. Both eyes had limbal relaxing incisions postoperatively. Four months postoperatively, corneal astigmatism was 4.50 D in the right eye and 4.00 D in the left. Refractive astigmatism was 0.50 D with an uncorrected visual acuity of 20/40 in both eyes. No IOL rotation was observed. Suturing toric lenses together allows greater correction of astigmatism without concern about counter rotation of the lenses. PMID:12648658

Gills, James P



Femoral artery infection associated with a percutaneous arterial suture device.  


This is a case report of a femoral artery infection with fatal outcome after using a percutaneous suture mediated closure device: A 77-year old patient underwent diagnostic angiography of his thoracic and abdominal aortic aneurysm, the puncture site was closed with the Perclose system. He developed a staphylococcal femoral artery infection with groin abscess, requiring surgical intervention with debridement and removal of the Perclose suture. After stent graft exclusion of the thoracic and abdominal aortic aneurysm a staphylococcal sepsis occurred and the patient died of aneurysm rupture months later despite long term antibiotic therapy. Since the use of the Perclose device carries an increased risk of femoral artery infection with septic endarteritis and bacteremia, it should not be used in routine diagnostic angiography. PMID:15224460

Tiesenhausen, K; Tomka, M; Allmayer, T; Baumann, A; Hessinger, M; Portugaller, H; Mahler, E



Spatulated anastomosis with continuous suture in microreconstructive surgery.  


In a well-proven criterion standard technique commonly used in cardiovascular surgery for anastomosis, proximal and distal vessels are spatulated to increase the anastomotic surface and improve congruency between the 2 vessels. Anastomosis is performed with continuous suture of the 2 bisected extremities.A review of the current literature has confirmed that our preliminary results were similar to those achieved by surgeons using the simple interrupted suture technique for microsurgical anastomosis.Patency is highly satisfactory with this technique for anastomosis. Moreover, it is a reliable technique requiring shorter total operative time. Hemostasis is easy to control and can be used with vessel diameters as small as 1 mm. For all these reasons, this technique already commonly used in vascular surgery for anastomosis could be interesting in microsurgery as well. PMID:22777466

Domergue, Sophie; Lange, Frédéric; Fassio, Eric; Yachouh, Jacques



CASE REPORT Pan-Suture Synostosis After Posterior Vault Distraction  

PubMed Central

Objective: Posterior vault remodeling by distraction osteogenesis is a relatively new technique used for initial correction of turribrachycephaly in children with bicoronal craniosynostosis. We present a new potential complication from this procedure; a case of pan-suture synostosis subsequent to posterior vault distraction. Methods: We report an infant girl who presented with bicoronal synostosis in the setting of Saethre-Chotzen syndrome. She underwent posterior vault distraction and was distracted a total of 34 millimeters, with successful osteogenesis at the site. Results: One year postoperatively, the patient was found to have incidental, asymptomatic pan-suture synostosis on computed tomography. Conclusions: To our knowledge, this is the first reported case of delayed craniosynostosis after posterior vault distraction in the literature. The possible pathogenesis and significance of this case are discussed with a review of the current literature.

Chu, Katrina F.; Sullivan, Stephen R.; Taylor, Helena O.



Shock absorbers - Are they necessary  

SciTech Connect

The economic benefits of running a shock absorber seem evident from their growing use in oil and gas drilling operations. However, some controversy still exists over when they should be used, how to get the greatest benefit from them, and whether there are some negative effects such as hole deviation associated with the usage of some shock absorbers. Extensive experience in recent years has included results with a wide variety of shock absorber designs in the full range of hole depths and sizes. The results show that lateral stiffness of the tool, the type of spring or other energy absorption system, and tool length have a significant influence on shock absorber performance. The energy absorption system and its location in the drill string, in conjunction with the type of bottom hole assembly design, bit selection, and formation characteristics, determine whether the maximum benefits possible from the shock absorber are attained. Major benefits from proper use of the appropriate shock absorber are longer bit life, higher drilling rates, longer drill-string life, reduced hazard from bending fatigue of the threaded connections in the drill string, and reduced wear on the rig equipment. These all result in a significant reduction of the overall drilling costs. Guidelines for shock absorber selection, placement in the drill string, and operating practices which yield the greatest overall benefit from the use of a shock absorber in oil field drilling are described. Ultimately, the decision to use a shock absorber will be based on economics. Does the use of a shock absorber reduce the overall drilling cost.

Worford, S.W.; Craig, P.G.



Meaningful assessment method for laparoscopic suturing training in augmented reality  

Microsoft Academic Search

Background  To be an effective training tool, a laparoscopic simulator has to provide metrics that are meaningful and informative to the\\u000a trainee. Time, path length and smoothness are often used parameters, but are not very informative on the quality of the performance.\\u000a This study aims to validate a newly developed assessment method for laparoscopic suturing on the ProMIS augmented reality\\u000a simulator,

Sanne M. B. I. Botden; I. H. J. T. de Hingh; J. J. Jakimowicz



Everting suture correction of lower lid involutional entropion  

PubMed Central

AIMS—To assess the long term efficacy of everting sutures in the correction of lower lid involutional entropion and to quantify the effect upon lower lid retractor function.?METHODS—A prospective single armed clinical trial of 62 eyelids in 57 patients undergoing everting suture correction of involutional entropion. Patients were assessed preoperatively and at 6, 12, 24, and 48 months postoperatively. The main outcome variables were lower lid position and the change in lower lid retractor function.?RESULTS—When compared with the non-entropic side, the entropic lid had a greater degree of horizontal laxity and poorer lower lid retractor function. These differences however, were not significant. At the conclusion of the study and after a mean follow up period of 31 months, the entropion had recurred in 15% of the patients. There were no treatment failures in the group of five patients with recurrent entropion. The improvement in lower lid retractor function after the insertion of lower lid everting sutures did not reach statistical significance. There was no significant difference between the treatment failure group and the group with a successful outcome with regard to: the degree of horizontal lid laxity or lower lid retractor function present preoperatively; patient age or sex; an earlier history of surgery for entropion. There was neither a demonstrable learning effect nor a significant intersurgeon difference in outcome. The overall 4 year mortality rate was 30%.?CONCLUSIONS—The use of everting sutures in the correction of primary or recurrent lower lid involutional entropion is a simple, successful, long lasting, and cost effective procedure.??

Wright, M.; Bell, D.; Scott, C.; Leatherbarrow, B.



How much do we need experts during laparoscopic suturing training?  

Microsoft Academic Search

Introduction  Because of the complex nature of laparoscopic suturing, numerous curricula have been developed to overcome the steep learning\\u000a curve in a patient-free environment. Distributed training leads to better acquisition and retention of skill compared with\\u000a massed training. However, this requires considerable time commitment of experts that supervise these training sessions. This\\u000a study investigates the possibility of replacing expert supervision by

Siska Van Bruwaene; Gunter De Win; Marc Miserez



Functional influence on sutural bone apposition in the growing rat  

Microsoft Academic Search

INTRODUCTION: The aim of this study was to quantify the influence of reduced masticatory muscle function on sutural bone apposition in the growing rat. METHODS: Twenty-six growing male albino rats were randomly divided into 2 equal groups; 1 (hard-diet group) received the ordinary diet of hard pellets, and the other (soft-diet group) received the powdered form of the ordinary diet

Christos Katsaros; Alexandros Zissis; Andrea Bresin; Stavros Kiliaridis



Complications of bioabsorbable suture anchors in the shoulder.  


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

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



Modified technique for arthroscopic Bankart repair using anchor sutures.  


Bankart repair, or one of its modifications, is currently the gold standard procedure for treatment of anterior traumatic shoulder instability. It is now possible to perform the operation arthroscopically with the introduction of suture anchors. As described by Eugene Wolf, arthroscopic shoulder stabilization using the Mitek (Mitek Surgical Products, Ethicon, Edinburgh, U.K.) anchors requires two anterior portals and intra-articular knot tying. However, sliding the anchor on the inside limb of a suture loop could be challenging because the other limb could get tangled in the nitinol arc of the anchor. We describe a modification of the original technique to prevent that possibility and avoid any tension on the repair tissue during anchor passage. The proposed modification involves the use of a cheap, readily available silastic feeding tube to isolate the outside limb of the suture loop and stabilize labral tissues while the anchor is being passed. This tube also serves as a stent for knot tying. By allowing the whole operation to be performed through one anterior portal, the modified technique reduces possible morbidity associated with a second portal and further reduces cost. PMID:15243444

Saweeres, Emad S B; Thomas, Andrew P



Biomechanics of the rostrum and the role of facial sutures.  


The rostrum is a large diameter, thin-walled tubular structure that receives loads from the teeth. The rostrum can be conceptualized both as a rigid structure and as an assemblage of several bones that interface at sutures. Using miniature pigs, we measured in vivo strains in rostral bones and sutures to gain a better understanding of how the rostrum behaves biomechanically. Strains in the premaxillary and nasal bones were low but the adjacent maxillary-premaxillary, internasal, and intermaxillary suture strains were larger by an order of magnitude. While this finding emphasizes the composite nature of the rostrum, we also found evidence in the maxillary and nasal bones for rigid structural behavior. Namely, maxillary strain is consistent with a short beam model under shear deformation from molar loading. Strain in the nasal bones is only partially supported by a long beam model; rather, a complex pattern of dorsal bending of the rostrum from incisor contact and lateral compression is suggested. Torsion of the maxilla is ruled out due to the bilateral occlusion of pigs and the similar working and balancing side strains, although it may be important in mammals with a unilateral bite. Torsional loading does appear important in the premaxillae, which demonstrate working and balancing side changes in strain orientation. These differences are attributed to asymmetrical incisor contact occurring at the end of the power stroke. PMID:12740894

Rafferty, Katherine L; Herring, Susan W; Marshall, Christopher D



Healing of the goat anterior cruciate ligament after a new suture repair technique and bioscaffold treatment.  


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

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



Evaluation of BioCorkscrew and Bioknotless RC suture anchor rotator cuff repair fixation: an in vitro biomechanical study  

Microsoft Academic Search

This in vitro biomechanical study used cadaveric specimens to compare the rotator cuff repair fixation provided by BioCorkscrew\\u000a and Bioknotless RC suture anchors. Three cm wide by 1-cm long full-thickness supraspinatus defects were repaired using either\\u000a two BioCorkscrew suture anchors with combined vertical and horizontal mattress sutures (n = 7) or three Bioknotless RC suture anchors with simple sutures (n = 7). Therefore, the

Jennifer Tucker Ammon; John Nyland; Haw Chong Chang; Robert Burden; David N. M. Caborn



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


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

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



Multiple wavelength laser suture lysis without slit lamp biomicroscopy in human cadaver eyes  

NASA Astrophysics Data System (ADS)

Trabeculectomy with early postoperative slit lamp laser suture lysis is a controlled means of maximizing bleb filtration and reducing intraocular pressure. However, this procedure is not possible in children and even some adults. Thus, an effective alternative method for postoperative laser suture lysis was investigated. Dissection of 15 scleral flaps was performed on two human cadaver eyes. Each flap was closed with two 10-0 nylon sutures and the conjunctiva repositioned to cover the sutures. Laser suture lysis was performed using an optical fiber probe for the Argon/Dye laser and a Hoskins laser lens. Five different wavelengths were studied: red (630 nm), orange (595 nm), yellow (577 nm), blue-green (488 - 514 nm), and green (514 nm). Each individual wavelength was studied using six scleral flap sutures, and a single laser application was applied to each suture. Suture lysis was attainable with each wavelength, however the argon green lysed 100 percent of the sutures. Histologic analysis demonstrated no conjunctival injury with any of the above wavelengths. These findings suggest that multiple wavelengths are effective in laser suture lysis without a slit lamp biomicroscope.

Kaz, Kian M.; Joos, Karen M.; Shen, Jin-Hui; Shetlar, Debra J.



Absence of endochondral ossification and craniosynostosis in posterior frontal cranial sutures of Axin2(-/-) mice.  


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

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



Bundles of spider silk, braided into sutures, resist basic cyclic tests: potential use for flexor tendon repair.  


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

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



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

PubMed Central

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

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



Method for designing an absorbent article  

US Patent & Trademark Office Database

A method for designing an absorbent article. The steps of the method are generating a physical spatial map of saturation of a fluid within an absorbent in a physical test environment, generating a virtual spatial map of saturation of a fluid within an absorbent in a virtual test environment, identifying absorbent-fluid interaction properties for the absorbent such that the virtual spatial map of saturation approximates the physical spatial map of saturation, inputting the absorbent-fluid interaction properties into a virtual model of the absorbent article to produce a representation of at least one feature of the absorbent article, evaluating the virtual model of the absorbent article to determine the performance of the at least one feature of the absorbent article, modifying the design of the absorbent article in response to the performance of the at least one feature of the absorbent article determined from the virtual model of the absorbent article.

Allende-Blanco; Mel (Loveland, OH); Anderson; Brian Bert (Liberty Township, OH); Hartt, IV; William Handy (Mason, OH); Lipic; Paul Martin (West Chester, OH); Schmidt; Mattias (Idstein, DE); Stevens; Douglas Gregory (Blue Ash, OH); Ehrnsperger; Bruno Johannes (Evendale, OH)



Ultrathin multiband gigahertz metamaterial absorbers  

NASA Astrophysics Data System (ADS)

We propose ultrathin multiband metamaterial absorbers in the microwave frequencies in which the design, analysis, fabrication, and measurement of the absorbers working in multiple bands are presented. The metamaterial absorbers consist of a periodic arrangement of different scales of electric-field-coupled-LC (ELC) resonators and a metallic background plane, separated by only 1 mm dielectric spacer. By tuning the scale factor of the ELC unit cells, we achieve independently multiple absorptions at different customized frequencies. Experiments demonstrate excellent absorption rates in the designed frequency bands over wide angles of incident waves for both transverse electric and magnetic polarizations. The explanation to the physical mechanism of the multiband metamaterial absorber is presented and verified.

Li, Hui; Yuan, Li Hua; Zhou, Bin; Shen, Xiao Peng; Cheng, Qiang; Cui, Tie Jun



Countercurrent flow absorber and desorber  


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.

Wilkinson, W.H.



Countercurrent flow absorber and desorber  


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.

Wilkinson, William H. (Columbus, OH)



Lambdoid synostosis. Part 1. The lambdoid suture: normal development and pathology of "synostosis".  


The microscopic development of the normal lambdoid suture was studied in autopsy specimens from 19 normal subjects ranging in age from 20 weeks' gestation to 60 years. The cellular activity at the suture varied considerably with age; however, maximal activity was seen in specimens approximately 3 months of age. There were several unusual features, including a high incidence of cartilaginous differentiation and the presence of intrasutural Wormian bones. Forty-one specimens from 37 patients with isolated lambdoid synostosis were also studied pathologically. Only three cases showed bone union across the suture, which appears to be a result of closure rather than fusion as in other synostoses. The remainder of the cases showed varying degrees of increased cellular proliferation at the suture line, resulting in exaggerated and prolonged sutural activity. Morphologically, this produced increased interdigitation and fibrous adhesion between the suture margins. PMID:6737058

Hinton, D R; Becker, L E; Muakkassa, K F; Hoffman, H J



Biocompatibility and strength properties of nitinol shape memory alloy suture in rabbit tendon.  


Nitinol (NiTi) is a promising new tendon suture material with good strength, easy handling and good super-elastic properties. NiTi sutures were implanted for biocompatibility testing into the right medial gastrocnemius tendon in 15 rabbits for 2, 6 and 12 weeks. Additional sutures were implanted in subcutaneous tissue for strength measurements in order to determine the effect of implantation on strength properties of NiTi suture material. Braided polyester sutures (Ethibond) of approximately the same diameter were used as control. Encapsulating membrane formation around the sutures was minimal in the case of both materials. The breaking load of NiTi was significantly greater compared to braided polyester. Implantation did not affect the strength properties of either material. PMID:14585723

Kujala, Sauli; Pajala, Ari; Kallioinen, Matti; Pramila, Antti; Tuukkanen, Juha; Ryhänen, Jorma



The double-sling suture: a modified technique for primary wound closure.  


The attainment of primary wound closure is one of the major determining factors of success in oral surgery. Especially when dealing with regenerative or augmentative procedures, healing in a submerged environment is crucial to achieving the desired treatment result. In this context, the use of a microsurgical approach and layered suturing techniques is of utmost importance for precise and meticulous wound closure. However, microsurgical wound closure using both mattress sutures and interrupted sutures is very time consuming and may be detrimental to wound healing because of trauma and extended surgical time. The double-sling suture, a modified suture technique that combines two interrupted sutures that have different bite sizes and engage different tissue layers, is able to predictably and efficiently close the surgical site for improved wound healing. This article describes this new technique and presents two case examples. PMID:19655501

Wachtel, Hannes; Fickl, Stefan; Zuhr, Otto; Hürzeler, Markus B



Acute Corneal Hydrops following Post-keratoplasty Suture Removal in Pellucid Marginal Degeneration  

PubMed Central

Purpose To report acute corneal hydrops following suture removal after penetrating keratoplasty (PK) in a case of pellucid marginal degeneration (PMD). Case report A young female underwent PK for corneal scarring in her left eye due to PMD; 8 months later the last sutures were removed. A few days following suture removal, the patient developed acute hydrops in the inferior aspect of the host-graft interface mostly in the recipient portion in the presence of a positive Seidel test. Review of the patient’s records revealed suture tract leakage in the early postoperative period at the same location which had been significantly thin. The patient received conservative therapy leading to complete resolution of the condition. Conclusion Through and through suture bites in a mismatched host-graft interface can predispose the patient to acute hydrops in PMD when the sutures are removed during routine postoperative care.

Fallahi Motlagh, Behzad; Mortazavi, Seyed Zia



Erk1\\/2 signaling is required for Tgf-?2–induced suture closure  

Microsoft Academic Search

Transforming growth factors (Tgf-s) act by means of Smad signaling pathways and may also interact with the mitogen-activated protein kinase pathway. The hypothesis was tested that Erk1\\/2 signaling is required for Tgf-2-induced suture closure, by culturing embryonic mouse calvariae in the presence of Tgf-2 with or without Erk1\\/2 inhibitor PD98059 (PD). Suture widths were measured daily, and microdissected sutures and

Lynne A. Opperman; Claudia R. Fernandez; Sarah So; Joseph T. Rawlins



Tissue interactions with underlying dura mater inhibit osseous obliteration of developing cranial sutures.  


Cranial sutures play a critical role in calvarial morphogenesis, serving as growth centers during skull development. Both biomechanical tensile forces originating in the cranial base and biochemical factors present in dura mater have been postulated as determinants of suture morphogenesis and patency. A rat transplant model free of the putative biomechanical influence of the dura and cranial base was used to investigate the role of the dura mater in both the initial morphogenesis and maintenance of sutures during skull growth. Day 19 fetal presumptive (F19) and day 1 neonatal differentiated (N1) coronal sutures, including associated frontal and parietal bones, were transplanted with or without underlying dura mater to the center of adult parietal bones. After 1, 2, and 3 weeks, transplanted tissues were examined histologically and histomorphometrically to determine whether sutures formed and whether they were obliterated by ossification in the absence of dura mater. Both F19 and N1 sutures remained patent for 2 weeks either in the presence or the absence of transplant dura mater. However, at 3 weeks, in the absence of transplant dura mater, sutures were obliterated by bone, while in the presence of dura mater sutures resisted ossification, demonstrating an essential requirement for interactions with the transplant dura mater in maintaining functional sutures. Both F19 and N1 transplants showed comparable bone growth (cross-sectional surface area), regardless of the presence of transplant dura mater. These experiments suggest that tissue interactions of a biochemical nature, rather than biomechanical forces generated through the cranial base, are required to maintain the suture as a non-ossified growth center. Furthermore, while the presence of dura mater was essential for maintenance of suture patency, fetal dura mater was not required for initial suture formation. PMID:8130378

Opperman, L A; Sweeney, T M; Redmon, J; Persing, J A; Ogle, R C



Description of a novel technique for suture ligation of the renal vessels during robotic nephrectomy  

Microsoft Academic Search

Minimally invasive techniques are frequently used for surgical treatment of suspected malignant renal masses. We previously\\u000a reported on our experience with robotic nephrectomy and the feasibility of performing suture ligation of the renal vessels\\u000a using robotic needle drivers. We describe a novel technique for suture ligation of the renal vessels during robotic nephrectomy\\u000a utilizing the robotic hook and a suture

Manish N. Patel; Rajesh Laungani; Alok Shrivastava; Akshay Bhandari; L. Spencer Krane; Mani Menon; Craig G. Rogers



Structural evolution of the Neoproterozoic Western Allaqi–Heiani suture, southeastern Egypt  

Microsoft Academic Search

The Neoproterozic Allaqi–Heiani suture in southeastern Egypt is the western extension of the Allaqi–Heiani–Onib–Sol Hamed–Yanbu suture that represents one of arc–arc sutures in the Arabian–Nubian Shield. It extends for more than 250km from the N-trending Hamisana Shear Zone in the east to Lake Nasser in the west. It separates the 750-Ma-old Southeastern Desert terrane in the north from the 830–720-Ma-old

Mohamed G. Abdelsalam; Mamdouh M. Abdeen; Hamid M. Dowaidar; Robert J. Stern; Amr A. Abdelghaffar



Ureteroscopic holmium laser cutting for inadvertently sutured drainage tube (report of five cases).  


The aim of this paper is to report a simple solution for inadvertently sutured drainage tube after urological surgery and discuss the different managements according to different types of this embarrassing complication. From September 2001 to January 2007, five inadvertently sutured drainage tubes were treated with ureteroscopic holmium laser cutting for the suture. All drainage tubes were removed after the operation without other complications. Holmium laser cutting via ureteroscope is a simple solution for the embarrassing problem of inadvertently sutured drainage tube. It can save the patient from undergoing another open surgery. PMID:17713824

Gao, Xu; Lu, Xin; Ren, Shancheng; Xu, Chuanliang; Sun, Yinghao



An artificial neural network approach to the predictive modeling of tensile force during renal suturing.  


Further understanding of the mechanical deformation and tear behavior of kidney during suturing helps to enhance surgical task execution that requires fine suture manipulation. This paper aims to develop a model to describe the relationship between the tensile force acting on suture line and the resulted kidney deformation in the tension of suture line. The tensile force was recorded during multiple suture procedures, filtered, and we extracted the force data between the beginnings of tensioning suture line and tearing renal remnant. The extracted data were interpolated to obtain the same data sample length for each suture procedure, and then used to train the back propagation (BP) neural network. In order to predict the tearing force, force data were collected in sequence and interpolated to be input into BP network. Suture processes were performed on in vitro porcine kidneys, and experimental results verified the effectiveness of predictive modeling and the accuracy of tearing force prediction. The relative error for tearing force prediction was about 15%. The predictive modeling method can be used to forecast the tearing force before the suture line tears through soft tissues. PMID:23232560

Yu, Dai; Qing, Yang; Jianxun, Zhang; Jun, Du



Laparoscopic intracorporal colorectal sutured anastomosis using the Radius Surgical System in a phantom model  

Microsoft Academic Search

Background  The Radius Surgical System (RSS) is a manipulator with additional degrees of freedom to enhance the dexterity of laparoscopic\\u000a suturing. Our aim was to determine the feasibility and potentially added value of laparoscopic intracorporal sutured colorectal\\u000a anastomosis (RSS) compared with suturing with conventional laparoscopic instruments (CLI).\\u000a \\u000a \\u000a \\u000a Methods  A total of 72 colorectal anastomoses and 30 single sutures using RSS and CLI

J. R. Torres Bermudez; G. Buess; M. Waseda; I. Gacek; F. Becerra Garcia; G. A. Manukyan; N. Inaky



Inadequacy of a polyester (Mersilene) suture for the reduction of astigmatism after penetrating keratoplasty.  

PubMed Central

Through two prospective studies, we evaluated the use of polyester (Mersilene) sutures in penetrating keratoplasty. Study 1 was a randomized comparison of combined running and interrupted Mersilene and nylon sutures (n = 45). Study 2 was a case series of single running Mersilene with postoperative adjustment of suture tension to manage astigmatism (n = 23). Study 1 demonstrated that Mersilene interrupted sutures were 5.5 times more likely to have handling-related complications compared to nylon (P = 0.01); in addition, they were 3 times as likely to have tissue-related complications as nylon interrupted sutures (P = 0.16). Study 2 demonstrated a complication rate of 69% when Mersilene was used as a single adjustable running suture. At 6 months postoperatively, the median refractive astigmatism for the adjustable cases was 3.37 D (mean, 4.03 +/- 2.37 D). Eyes in Study 2 with significant suture-related complications were 2.85 times more likely to have greater than 4 D of refractive astigmatism than were eyes without suture-related complications. We concluded that Mersilene is an undesirable suture for use in penetrating keratoplasty.

Bertram, B A; Drews, C; Gemmill, M; Guell, J; Murad, M; Waring, G O



Brief communication: histology and micro CT as methods for assessment of facial suture patency.  


The extent of fusion in facial sutures has implications for topics ranging from biomechanics to phylogeny reconstruction. An unfortunate limitation of studying sutural fusion in skeletal specimens is that it is difficult to assess whether apparently patent sutures are in fact fused internally. Both histology and microcomputed tomography (CT) are potential tools for solving this, but relatively few studies have attempted to discern the limits of micro CT for visualization of microanatomical structures. We examined microanatomical aspects of facial sutures in adult cadaveric samples from captive bushbabies. Premaxillary and nasopremaxillary sutures were examined in serially sectioned snouts of four greater bushbabies (Otolemur garnettii) and four lesser bushbabies (Galago moholi). Sections containing sutures with osseous bridging were rated as "fused," and the presence or absence of grooves on the external side was recorded. One bushbaby was studied using micro CT prior to physical sectioning. O. garnettii and two of the G. moholi show multiple foci of fusion. Histological examination confirmed that sutural fusion is limited to the internal surface in numerous sections, resulting in an external notch. Such points of internal fusion could be clearly visualized in raw CT slices. The presence of such notches suggests that external examination can underestimate the degree of suture fusion. Thus, microanatomical evidence may be needed to fully assess biomechanical correlates and phylogenetic interpretations based on fusion of facial sutures. Our results also indicate micro CT may be a useful tool to obtain this evidence. PMID:19170212

Reinholt, Lauren E; Burrows, Anne M; Eiting, Thomas P; Dumont, Elizabeth R; Smith, Timothy D



Ab externo technique for accurate haptic placement of transscleral sutured posterior chamber intraocular lenses.  


A modified technique is presented for transscleral suture fixation of posterior chamber intraocular lenses for aphakic correction in cases with inadequate capsular support. An ab externo approach for suture externalization is described that minimizes intraocular manipulation and facilitates accurate placement of haptics in the ciliary sulcus, thereby reducing the risk of lens tilt and decentration. This technique eliminates intraocular suture knots and reduces the amount of time the globe is open during surgery by creating two intraocular suture loops in preparation for posterior chamber intraocular lens placement before creating a limbal incision. PMID:17278542

Kulkarni, Kaushal; Zarbin, Marco; Del Priore, Lucian V; Tezel, Tongalp H


Laparoscopic sutured closure with mesh reinforcement of incisional hernias  

Microsoft Academic Search

Background  This study reports medium-term outcomes of laparoscopic incisional hernia repair.\\u000a \\u000a \\u000a \\u000a Study Design  Laparoscopic repair was performed on 721 patients with ventral hernia. After adhesiolysis the defect was closed with no. 1\\u000a polyamide suture or loop. This was followed by reinforcement with intraperitoneal onlay repair with a bilayered mesh.\\u000a \\u000a \\u000a \\u000a Results  Laproscopic repair of ventral hernia was performed on 613 females and 108 males.

C. Palanivelu; K. V. Jani; P. Senthilnathan; R. Parthasarathi; M. V. Madhankumar; V. K. Malladi



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

PubMed Central

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

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



Suturing techniques and postoperative management in penetrating keratoplasty in the United Kingdom  

PubMed Central

Aims To report on the suturing techniques and aspects of postoperative management in penetrating keratoplasty in the United Kingdom. Methods A postal questionnaire was sent to 137 ophthalmic consultants identified from a Royal College of Ophthalmology database as having a special interest in anterior segment surgery. The questionnaire surveyed surgeon preferences for surgical and suturing technique for penetrating keratoplasty surgery, and the postoperative care of corneal grafts. Results In all, 68% of questionnaires were completed and returned: 73% of respondents used a Flieringa ring or equivalent, 94% routinely used cardinal sutures, with 50.5% removing them at the end of the procedure. The most common suturing technique for routine penetrating keratoplasty was a single continuous suture (35%). In these cases, a 10/0 nylon suture was used by 89%. Sixty-six percent changed their technique in high-risk cases, 52% used a 3-1-1 knot, and 75% made a distinction between a reef and granny knot, with 76% using a reef. Thirty percent buried the knots within the donor material, and 29% within the host tissue. Twenty-five percent had no routine time for graft suture removal, but 41% removed them between 1 and 2 years post-surgery. After suture removal, 98% used steroids and 88% used topical antibiotics. Thirty-four percent stopped topical steroids before suture removal, with 38% stopping topical steroids more than 3 months prior to suture removal. Conclusion This survey demonstrates that there is considerable variation in suturing techniques and postoperative care for penetrating keratoplasty. These significant variations in practice need to be considered when interpreting outcomes and research.

Lee, Richard MH; Lam, Fook Chang; Georgiou, Tassos; Paul, Bobby; Then, Kong Yong; Mavrikakis, Ioannis; Avadhanam, Venkata S; Liu, Christopher SC



Damage tolerant light absorbing material  


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 C. to form a carbon-bonded carbon fiber light absorbing composite article having a bulk density less than 1 g/cm.sup.3.

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



Damage tolerant light absorbing material  


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.

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



Novel planar absorber designs using genetic algorithms  

Microsoft Academic Search

Electromagnetic absorbers are often used to reduce radar echo from anechoic chambers, aircraft and so on. For many applications, the absorber must be built conformable to a complex surface, or must have a flat interface with the air. A new class of planar electromagnetic absorbers is proposed. This absorber is created by drilling textures within or on top of lossy

Suomin Cui; D. S. Weile; J. L. Volakis



Laser tissue welding in genitourinary reconstructive surgery: assessment of optimal suture materials  

Microsoft Academic Search

Objectives. Laser tissue welding in genitourinary reconstructive surgery has been shown in animal models to decrease operative time, improve healing, and decrease postoperative fistula formation when compared with conventional suture controls. Although the absence of future material is the ultimate goal, this has not been shown to be practical with current technology for larger repairs. Therefore, suture-assisted laser tissue welding

Dix P. Poppas; Scott D. Klioze; Robert G. Uzzo; Steven M. Schlossberg



Suture fixation of an intraocular lens combined with pars plana vitrectomy and gas tamponade  

Microsoft Academic Search

We describe suturing an intraocular lens (IOL) after pars plana lensectomy and vitrectomy combined with gas tamponade in 4 patients with vitreoretinal disease and subluxated lenses that could not be managed with capsular tension rings. The IOL haptics were sutured before the fluid–gas exchange in a horizontal (case 1), oblique (cases 2 and 4), and vertical (case 3) manner. In

Tsukasa Hanemoto; Hidenao Ideta; Tsutomu Kawasaki; Ryuichi Ideta; Michiko Okuyama



Sensory electroneurographic parameters and clinical recovery of sensibility in sutured human nerves  

Microsoft Academic Search

A total of 37 patients with traumatic transection of median or ulnar nerves at the wrist (total 41 nerves) were examined clinically and electrophysiologically 4–59 months after primary or secondary suture or grafting. There was a significant increase of cumulative amplitude with the time after suture, whereas maximum sensory nerve conduction velocity and maximum amplitude of nerve action potentials did

W. Tackmann; J. Brennwald; H. Nigst



Comparison of Surgical Staples and Silk Sutures for Closing Incisions in Rainbow Trout  

Microsoft Academic Search

The effects of surgical staples on incision healing and long-term fish growth are largely unknown. To determine these effects, we implanted 50 rainbow trout Oncorhynchus mykiss with dummy radio transmitters, closed incisions with either silk sutures or steel staples, and monitored these fish for 6 months. Surgeries with staples were performed twice as fast as suture surgeries. Incisions closed with

Tim R. Swanberg; David A. Schmetterling; David H. McEvoy



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


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

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



Inadvertent suture through the chest tube: a simple solution to a frustrating problem  

Microsoft Academic Search

Although an uncommon complication, inadvertent suturing of the chest tube to the chest wall during closure of a thoracotomy, unfortunately can happen. This frustrating situation likely leads to a rethoracotomy and cutting of the suture in order to release the chest tube. In this report, we propose a fast and easy solution to this problem.

Prassad Jetty; Reza John Mehran



Mitral Valve Repair for Anterior Leaflet Prolapse With Expanded Polytetrafluoroethylene Sutures  

Microsoft Academic Search

Background. This study was a long-term Doppler echo- cardiographic assessment of mitral valve repair for ante- rior mitral leaflet prolapse using expanded polytetrafluo- roethylene sutures. Methods. Between April 1992 and December 2003, we performed mitral valve repair using expanded polytetra- fluoroethylene sutures in 204 patients (mean age, 54.6 years) with severe mitral regurgitation (MR) having an- terior mitral leaflet prolapse.

Hitoshi Kasegawa; Tomoki Shimokawa; Ikuko Shibazaki; Hiroki Hayashi; Toshiya Koyanagi; Takao Ida



Comparison of effects of suture and cyanoacrylate tissue adhesive on bacterial counts in contaminated lacerations.  

PubMed Central

We studied the effects of closing lacerations with suture or cyanoacrylate tissue adhesive on staphylococcal counts in inoculated guinea pig lacerations. Wounds closed with adhesive alone had lower counts than wounds containing suture material (P < 0.05). The results of a time-kill study were consistent with a bacteriostatic adhesive effect of the adhesive against Staphylococcus aureus.

Howell, J M; Bresnahan, K A; Stair, T O; Dhindsa, H S; Edwards, B A



Intracorporeal Suturing and Knot Tying Broadens the Clinical Applicability of Laparoscopy  

PubMed Central

Objective: As surgeons become more experienced with basic laparoscopic procedures like cholecystectomy, they are able to expand this approach to less common operations. However, without laparoscopic suturing skills, like those obtained with Nissen fundoplication, many operations cannot be completed laparoscopically. We present a series of 10 patients with less common surgical illnesses who were successfully treated with minimal access techniques and intracorporeal suturing. Methods: Over a 6-month period at 2 medical centers, 10 patients underwent operations with laparoscopic intracorporeal suturing and knot tying. Diagnoses included bowel obstruction due to gallstone ileus (n=1), perforated uterus from an intrauterine device (n=1), urinary bladder diverticulum (n=1), bleeding Meckel's diverticulum (n=3), and perforated duodenal ulcer (n=4). Results: Each patient was treated with standard surgical interventions performed entirely laparoscopically with intracorporeal suturing. No morbidity or mortality occurred in any patient due to the operation. Conclusions: Although each of these operations has been previously reported, as a series, they point out the importance of mastering laparoscopic suturing. Although devices are commercially available to facilitate certain suturing scenarios, we encourage residents and fellows to sew manually. We believe that none of these operations could have been completed as effectively by using a suture device. The ability to suture laparoscopically markedly broadens the number of clinical scenarios in which minimal access techniques can be used.

Rivas, Homero; Cacchione, Robert N.; Ferzli, George S.



Effects of induced premaxillary suture fusion on the craniofacial morphology in growing rats  

Microsoft Academic Search

ObjectiveDue to premaxillary rapid development and fusion with the maxilla at the fetus stage, the functions of the premaxillary suture still remain unclear. This study was designed to explore the effect of artificial induced premaxillary suture fusion on craniofacial morphology.

Wen-hua Ruan; Julia N. Winger; Jack C. Yu; James L. Borke



Interference Screw vs. Suture Anchor Fixation for Open Subpectoral Biceps Tenodesis: Does it Matter?  

Microsoft Academic Search

BACKGROUND: Bioabsorbable interference screw fixation has superior biomechanical properties compared to suture anchor fixation for biceps tenodesis. However, it is unknown whether fixation technique influences clinical results. HYPOTHESIS: We hypothesize that subpectoral interference screw fixation offers relevant clinical advantages over suture anchor fixation for biceps tenodesis. STUDY DESIGN: Case Series. METHODS: We performed a retrospective review of a consecutive series

Peter J Millett; Brett Sanders; Reuben Gobezie; Sepp Braun; Jon JP Warner



Antibacterial-Coated Suture in Reducing Surgical Site Infection in Breast Surgery: A Prospective Study  

PubMed Central

Background. To reduce the incidence of microbial colonization of suture material, Triclosan- (TC-)coated suture materials have been developed. The aim of this study was to assess the incidence of suture-related complications (SRC) in breast surgery with and without the use of TC-coated sutures. Methods. We performed a study on two consecutive periods: 92 patients underwent breast surgery with conventional sutures (Group 1) and 98 with TC-coated sutures (Group 2). We performed subgroups analyses and developed a model to predict SRC in Group 1 and tested its clinical efficacy in Group 2 using a nomogram-based approach. Results. The SRC rates were 13% in Group 1 and 8% in Group 2. We found that some subgroups may benefit from TC-coated sutures. The discrimination obtained from a logistic regression model developed in Group 1 and based on multifocality, age and axillary lymphadenectomy was 0.88 (95% CI 0.77–0.95) (P < 10?4). There was a significant difference in Group 2 between predicted probabilities and observed percentages (P < 10?5). The predicted and observed proportions of complications in the high-risk group were 38% and 13%, respectively. Conclusion. This study used individual predictions of SRC and showed that using TC-coated suture may prevent SRC. This was particularly significant in high-risk patients.

Laas, Enora; Poilroux, Cecile; Bezu, Corinne; Coutant, Charles; Uzan, Serge; Rouzier, Roman; Chereau, Elisabeth



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

Microsoft Academic Search

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

Stephen S. Burkhart



Counterflow absorber for an absorption refrigeration system  


An air-cooled, vertical tube absorber for an absorption refrigeration system is disclosed. Strong absorbent solution is supplied to the top of the absorber and refrigerant vapor is supplied to the bottom of the absorber to create a direct counterflow of refrigerant vapor and absorbent solution in the absorber. The refrigeration system is designed so that the volume flow rate of refrigerant vapor in the tubes of the absorber is sufficient to create a substantially direct counterflow along the entire length of each tube in the absorber. This provides several advantages for the absorber such as higher efficiency and improved heat transfer characteristics, and allows improved purging of non-condensibles from the absorber.

Reimann, Robert C. (Lafayette, NY)



The ramp mattress suture: a new suturing technique combined with a surgical procedure to obtain papillae between implants in the buccal area.  


This article has been written to show the opportunity and eventually the predictability to obtain new papillae between implants and a better esthetic result by the use of a new suturing technique. After raising a full-thickness flap from the palatal to the vestibular side, it can be stabilized in such a position using a new suturing technique (ramp mattress suture) to apply pressure and tearing forces on the flap in an apicocoronal direction at the vestibular site and an opposite traction in a coronoapical direction at the palatal site. The ramp mattress suture seems to be capable of pulling the flap in an apicocoronal direction in the vestibular site, as well as in a coronoapical direction in the palatal site. Thanks to such a mattress suture, it will be possible to obtain a more coronal gingival margin. After an adequate healing period of approximately 5 weeks, a vestibular scalloped gingivectomy is performed around the vestibular surface of the abutment to create either a scalloped gingival margin or interproximal papillae only in the vestibular area, forming a gingival ramp in a palatovestibular direction to reasonably reduce the residual increased vestibular depth and optimize the esthetic result. Eight patients, for a total of 56 papillae, were treated with this new suturing technique. The esthetic results satisfied both clinician and patient expectations. PMID:11922220

Tinti, Carlo; Benfenati, Stefano Parma



Microwave absorbing composite lattice grids  

Microsoft Academic Search

Stretching dominated lattice grids reinforced by glass fibers and carbon fibers filled with spongy materials were designed and manufactured to achieve multifunctional structures with microwave absorbing abilities. The reflectivity of the GFRC and CFRC grid panels was measured in the darkroom at normal and oblique incidences, respectively. GFRC grid panels of 20mm thickness and CFRC panels of 18mm thickness displayed

H. L. Fan; W. Yang; Z. M. Chao



How Greenhouse Gases Absorb Heat  

NSDL National Science Digital Library

Learners observe two model atmospheres -- one with normal atmospheric composition and another with an elevated concentration of carbon dioxide. These two model atmospheres are exposed to light energy from a sunny window or from a lamp. This activity will help learners understand that greenhouse gases in the atmosphere absorb and hold heat, relating to global warming and climate change.

History, American M.



Performance Testing of Shock Absorbers  

Microsoft Academic Search

For a better understanding and evaluation of shock absorber performance, detailed data upon their relevant physical parameters, such as spring characteristics and energy dissipation properties, have been measured in a test jig. Down hole tests where well defined sinusoidal vibrations are generated in a 1000 m vertical drill string by means of a down hole exciter were also performed. The

E. Skaugen; A. Kyllingstad



Ectocranial suture closure in Pan troglodytes and Gorilla gorilla: pattern and phylogeny.  


The order in which ectocranial sutures undergo fusion displays species-specific variation among primates. However, the precise relationship between suture closure and phylogenetic affinities is poorly understood. In this study, we used Guttman Scaling to determine if the modal progression of suture closure differs among Homo sapiens, Pan troglodytes, and Gorilla gorilla. Because DNA sequence homologies strongly suggest that P. troglodytes and Homo sapiens share a more recent common ancestor than either does with G. gorilla, we hypothesized that this phylogenetic relationship would be reflected in the suture closure patterns of these three taxa. Results indicated that while all three species do share a similar lateral-anterior closure pattern, G. gorilla exhibits a unique vault pattern, which, unlike humans and P. troglodytes, follows a strong posterior-to-anterior gradient. P. troglodytes is therefore more like Homo sapiens in suture synostosis. PMID:18350580

Cray, James; Meindl, Richard S; Sherwood, Chet C; Lovejoy, C Owen



Suture passing needle breakage during arthroscopic rotator cuff repair: a complication report.  


Arthroscopic rotator cuff repair is a well established surgical technique. Passing sutures through the rotator cuff is a critical-and at times, time-consuming-portion of the procedure. Suture-passing devices have been developed that combine a nitinol needle for pushing sutures through the tissue with a tissue grasper. These devices eliminate multiple steps in the repair process and improve the efficiency of the operation. However, as with any innovation, there is the potential for complications. It is vital that these technical complications be appreciated so that they can be avoided in the future. We report a case in which the needle tip of a suture-passing device broke during arthroscopic rotator cuff repair. The breakage was not recognized until after the operation. The patient was observed for 2 years without migration of the foreign body. To our knowledge, this is the first reported complication associated with the use of this type of suturing device. PMID:19038716

Song, Hyun Seok; Ramsey, Matthew L



Celastrol nanoparticles inhibit corneal neovascularization induced by suturing in rats  

PubMed Central

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

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



Geometry and cell density of rat craniofacial sutures during early postnatal development and upon in vivo cyclic loading  

Microsoft Academic Search

Cranial sutures are unique to skull bones and consist of multiple connective tissue cell lineages such as mesenchymal cells, fibroblast-like cells, and osteogenic cells, in addition to osteoclasts. Mechanical modulation of intramembranous bone growth in the craniofacial suture is not well understood, especially during postnatal development. This study investigated whether in vivo mechanical forces regulate sutural growth responses in postnatal

Kapil Vij; Jeremy J. Mao



The B-Lynch uterine brace suture, and a bit of this and a bit of that…  

Microsoft Academic Search

The widespread application of the B-Lynch brace suture to control postpartum hemorrhage has sparked interest in a variety of adjunctive methods, used alone or in combination, to control uterine bleeding. Although the B-Lynch brace suture has been used with good results throughout the world, failures can and do occur in rare instances, especially when the suture is incorrectly placed for

Mahantesh Karoshi



Electrical structure across the Indus Tsangpo suture and Shyok suture zones in NW Himalaya using magnetotelluric studies  

NASA Astrophysics Data System (ADS)

Magnetotelluric studies in the NW Himalayan region have shown anomalously high conductance of about 20,000 siemens in the crust beneath the Indus Tsangpo suture (ITS) and the adjoining Tso-Morari dome in the depth range of 1-20 km. High heat flow and high attenuation of the seismic waves in the Himalayan crust, together with the observed high conductance indicate presence of wide spread partial melt generated from the subducted Indian crust. The Ladakh batholith appears as a resistive block to the north of ITS. A moderately conductive zone demarcates the Ladakh batholith from Karakoram batholith to the north. The similarity in the resistive structure with the results reported from the Tibetan region by Wei et al. [2001] about 1500 km to the east is rather significant, indicative of a two dimensional nature of the Himalayan collision belt, at least to the first order.

Gokarn, S. G.; Gupta, Gautam; Rao, C. K.; Selvaraj, C.



Tissue Reactions to Various Suture Materials Used in Oral Surgical Interventions  

PubMed Central

A variety of suture materials are available for primary wound closure following oral surgical procedures. The aim was to review the tissue reactions to the various suture materials used in oral surgical interventions. Databases were searched using the following keywords: cotton, nylon, polyglecaprone 25, polytetrafluoroethylene (ePTFE), Polyglactin 910, polyglycolic acid (PGA), polylactic acid, silk, surgery, suture, and tissue reaction. Articles published only in English language were included. Seventeen studies were included. Two studies reported that polyglecaprone 25 had positive effects on wound-healing as compared to silk. Six studies reported that silk elicits more intense tissue inflammatory response and delayed wound healing as compared to other suture materials (including ePTFE, polyglecaprone-25, PGA, and nylon). Polyglactin 910 sutures were associated with the development of stitch abscess in one clinical study. Eight studies reported that tissue reactions are minimal with nylon sutures. Tissue reactions to suture materials used for oral surgical interventions may vary depending on the surface properties and bacterial adherence properties of the material.

Javed, Fawad; Al-Askar, Mansour; Almas, Khalid; Romanos, Georgios E.; Al-Hezaimi, Khalid



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


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

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



Impaired Posterior Frontal Sutural Fusion in the Biglycan/Decorin Double Deficient Mice  

PubMed Central

Biglycan (Bgn) and decorin (Dcn) are highly expressed in numerous tissues in the craniofacial complex. However, their expression and function in the cranial sutures is unknown. In order to study this, we first examined the expression of biglycan and decorin in the posterior frontal suture (PFS), which predictably fuses between 21–45 days post-natal and in the non-fusing sagittal (S) suture from wildtype (Wt) mice. Our data showed that Bgn and Dcn were expressed in both cranial sutures. We then characterized the cranial suture phenotype in Bgn deficient, Dcn deficient, Bgn/Dcn double deficient, and Wt mice. At embryonic day 18.5, alizarin red/ alcian blue staining showed that the Bgn/Dcn double deficient mice had hypomineralization of the frontal and parietal craniofacial bones. Histological analysis of adult mice (45–60 days post natal) showed that the Bgn or Dcn deficient mice had no cranial suture abnormalities and immunohistochemistry staining showed increased production of Dcn in the PFS from Bgn deficient mice. To test possible compensation of Dcn in the Bgn deficient sutures we examined the Bgn/Dcn double deficient mice and found they had impaired fusion of the PFS. Semi-quantitative RT-PCR analysis of RNA from 35 day-old mice revealed increased expression of Bmp-4 and Dlx-5 in the PFS compared to their non-fusing S suture in Wt tissues and decreased expression of Dlx-5 in both PF and S sutures in the Bgn/Dcn double deficient mice compared to the Wt mice. Failure of PFS fusion and hypomineralization of the calvaria in the Bgn/Dcn double deficient mice demonstrate these extracellular matrix proteoglycans could have a role in controlling the formation and growth of the cranial vault.

Wadhwa, Sunil; Bi, Yanming; Ortiz, Ana T.; Embree, Mildred C.; Kilts, Tina; Iozzo, Renato; Opperman, Lynne A.; Young, Marian F.



Achilles tendon suture deteriorates tendon capillary blood flow with sustained tissue oxygen saturation - an animal study  

PubMed Central

Background Treatment of ruptured Achilles tendons currently constitutes of conservative early functional treatment or surgical treatment either by open or minimal invasive techniques. We hypothesize that an experimental Achilles tendon suture in an animal model significantly deteriorates Achilles tendon microcirculation immediately following suturing. Methods Fifteen Achilles tendons of eight male Wistar rats (275–325 g) were included. After preparation of the Achilles tendon with a medial paratendinous approach, Achilles tendon microcirculation was assessed using combined Laser-Doppler and spectrophotometry (Oxygen-to-see) regarding: - tendinous capillary blood flow [arbitrary units AU] - tendinous tissue oxygen saturation [%] - tendinous venous filling pressure [rAU] The main body of the Achilles tendon was measured in the center of the suture with 50 Hz. 10 minutes after Achilles tendon suture (6-0 Prolene), a second assessment of microcirculatory parameters was performed. Results Achilles tendon capillary blood flow decreased by 57% following the suture (70 ± 30 AU vs. 31 ± 16 AU; p < 0.001). Tendinous tissue oxygen saturation remained at the same level before and after suture (78 ± 17% vs. 77 ± 22%; p = 0.904). Tendinous venous filling pressure increased by 33% (54 ± 16 AU vs. 72 ± 20 AU; p = 0.019) after suture. Conclusion Achilles tendon suture in anaesthetised rats causes an acute loss of capillary perfusion and increases postcapillary venous filling pressures indicating venous stasis. The primary hypothesis of this study was confirmed. In contrast, tendinous tissue oxygen saturation remains unchanged excluding acute intratendinous hypoxia within the first 10 minutes after suture. Further changes of oxygen saturation remain unclear. Furthermore, it remains to be determined to what extent reduced capillary blood flow as well as increased postcapillary stasis might influence tendon healing from a microcirculatory point of view in this animal setting.

Kraemer, Robert; Lorenzen, Johan; Rotter, Robert; Vogt, Peter M; Knobloch, Karsten



Complement activation by vascular sutures both alone and in combination with synthetic vascular prostheses.  


Polymer surfaces activate complement pathways resulting in platelet and leucocyte deposition as well as possible release of growth factors. A consequence of these interactions may be early graft failure or intimal hyperplasia leading to late graft failure. C5a generation in human plasma by vascular sutures, both alone and in combination with synthetic vascular prostheses was measured by radioimmunoassay to determine the influence of suture materials on C5a activation. Prolene and ePTFE suture material caused significant activation of C5a (p less than 0.01), while Novafil did not. Both Dacron and ePTFE graft material caused significant activation (p less than 0.01) of C5a. The addition of the suture materials to the ePTFE did not increase the C5a levels above the ePTFE material alone. In contrast, the addition of either Prolene or Novafil suture to Dacron material elevated C5a levels significantly over Dacron alone (p less than 0.01). The combination of Dacron material with ePTFE suture did not increase C5a levels over Dacron alone. The pattern of C5a activation by Prolene, ePTFE and Novafil sutures parallels the relative degree of in-vivo platelet accumulation on these suture materials as previously reported by our group. Since these experiments demonstrate that vascular suture material influences human complement activation, it may be that this interaction contributes to either early or late graft failure by enhancing platelet reactivity or neointimal proliferation, respectively. PMID:1830854

Coleman, J E; McEnroe, C S; Gelfand, J A; Connolly, R J; Callow, A D



[An improved single-layer suture in the surgery of small and large intestines].  


The methods and results of using single-layer interrupted intestinal suture in operations on the small and large intestines are presented. Using the suture decreases the number of complications associated with this technique, improves the direct results of operations and reduces postoperative lethality both in urgent and planned surgery. The proposed intestinal suture is thought to be justified in connecting similar and dissimilar parts of the intestinal tube in the variants of longitudinal, transversal, terminal, lateral and termino-lateral interintestinal anastomoses. PMID:21400815

Kapustin, B B; Sysoev, S V



Making straight suture needles a little safer: a technique to keep fingers from harm's way.  


Straight suture needles are commonly employed to secure arterial and venous catheters to the skin. These needles have been demonstrated to be more dangerous than curved or blunt suture needles, with a higher rate of injury for health care workers. This article describes a technique for using the straight needle that may reduce the chances of injury. By utilizing the plastic needle sheath present in most central venous line kits as a "thimble," counter pressure and skin puncture may be achieved without bringing the fingers near the sharp end of the suture. PMID:18282537

Nelson, Bret P



Robotic assistance improves intracorporeal suturing performance and safety in the operating room while decreasing operator workload  

Microsoft Academic Search

Background  Intracorporeal suturing is one of the most difficult laparoscopic tasks. The purpose of this study was to assess the impact\\u000a of robotic assistance on novice suturing performance, safety, and workload in the operating room.\\u000a \\u000a \\u000a \\u000a Methods  Medical students (n = 34), without prior laparoscopic suturing experience, were enrolled in an Institutional Review Board-approved, randomized\\u000a protocol. After viewing an instructional video, subjects were tested in

Dimitrios Stefanidis; Fikre Wang; James R. Korndorffer Jr; J. Bruce Dunne; Daniel J. Scott



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

PubMed Central

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

Holmlund, D E



Terahertz Backscattering Behavior of Various Absorbing Materials.  

National Technical Information Service (NTIS)

The Submillimeter-Wave Technology Laboratory (STL) at the University of Massachusetts Lowell has investigated the electromagnetic scattering behavior of various broadband absorbers. Several absorbing materials were tested in a compact radar range operatin...

A. J. Gatesman C. Wu L. DeRoeck R. H. Giles T. Horgan



Waveguide characterization of flexible absorbing material  

Microsoft Academic Search

Among the materials with adequate performance to be used as radar absorbing material (RAM), the conducting polymers have been under intensive study due to their excellent potential for application in electromagnetic interference and microwave absorption areas, replacing conventional absorbing materials. The aim of this work is to present electromagnetic characterization of the flexible radar absorbing material at microwave frequency range

L. C. Folgueras; R. Faez; M. C. Rezende



An introduction to Radar Absorbent Materials (RAM)  

Microsoft Academic Search

The electromagnetic principles of radar absorbent materials are summarized. The fundamental theory of electromagnetic wave propagation in media and at the interfaces between different media is reviewed, and approaches to absorber design are described. The types of materials required and the techniques for measuring their electromagnetic properties and the performance of the finished absorber are outlined. A means of designing

P. G. Lederer



Embedded absorbers for helicopter rotor lag damping  

Microsoft Academic Search

Radial and chordwise damped vibration absorbers embedded in the rotor blade are compared for rotor lag damping augmentation. Results show that the radial absorber is more effective in transferring damping to the rotor blade lag mode. The chordwise absorber needs to be at a more outboard location and have a larger mass to introduce levels of lag damping comparable to

Lynn Byers; Farhan Gandhi



Embedded absorbers for helicopter rotor lag damping  

NASA Astrophysics Data System (ADS)

Radial and chordwise damped vibration absorbers embedded in the rotor blade are compared for rotor lag damping augmentation. Results show that the radial absorber is more effective in transferring damping to the rotor blade lag mode. The chordwise absorber needs to be at a more outboard location and have a larger mass to introduce levels of lag damping comparable to that introduced by the radial absorber. The 1/rev amplitude of a chordwise absorber at the blade tip, per degree of blade lead-lag motion in forward flight, is of the order of 35% of the blade chord, and such a stroke might be difficult to accommodate. The 1/rev amplitude of a radial absorber at 70% span (having significantly lower mass than the chordwise absorber and producing comparable lag damping) is of the order of 4% of the rotor blade span. The static displacement of the radial absorber under centrifugal load needs to be limited using a frequency-dependent (high static stiffness, low dynamic stiffness) or nonlinear spring. The chordwise absorber can also undergo a large static displacement under the chordwise component of the centrifugal load if there is an offset from the feather axis, and this would again have to be limited using a strategy such as a frequency-dependent spring. Significant advantages of the radial absorber are—higher lag damping, lower absorber mass, space for absorber mass travel, and no chordwise travel of blade center of gravity reducing susceptibility to aeroelastic instability and dynamic pitch-link loads.

Byers, Lynn; Gandhi, Farhan



FFTF absorber-pin performance verification test  

Microsoft Academic Search

The FFTF (Fast Flux Test Facility) Absorber Pin Performance Verification Test - (HA006) is an irradiation test of neutron absorber pins with integral temperature and pressure monitoring instrumentation. The pins, containing boron carbide, are representative of the FFTF Row 3 Safety, Row 5 Control and Row 7 Fixed Shim Absorber Assemblies. In the 300 full power days (FPD) this test

J. A. Basmajian; D. C. King; J. L. Jackson; M. A. Vogel



Porcelain enamel neutron absorbing material  


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.

Iverson, D.C.



Porcelain enamel neutron absorbing material  


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 compounds 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.

Iverson, Daniel C. (Aiken, SC)



Mulitlayered Nanostructured Broad Band Absorber  

NASA Astrophysics Data System (ADS)

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.

Corrigan, Timothy; Ide, Benjamin



Creep rupture of polypropylene sutures as a function of diameter, radiation dose and temperature.  


The failure of polypropylene (PP) sutures was studied via creep rupture tests. Linear relationships were generated from plots of log time to break (tB) versus stress (sigma). At a constant sigma the results showed that tB was inversely proportional to the suture diameter (7-0, 6-0, 5-0 and 4-0) and to the radiation dose (0, 15, 20, 25 and 50 Mrad). Moreover, for the 6-0 suture size at a 15 Mrad dose, tB decreased with increasing temperature (26, 37, 44, 50 and 60 degrees C). For this creep rupture process the activation energy equalled 91.2 kJ/mol (21.8 kcal/mol). A mechanism for failure was presented which assumes that these sutures are bundles of oriented, semicrystalline microfibrils. PMID:3224142

Whitley, J Q; Kusy, R P



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

PubMed Central

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

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



Expert testimony and positive identification of human remains through cranial suture patterns.  


North American forensic anthropological research should conform to the Daubert criteria (U.S.A.) and Mohan ruling (Canada) to ensure admissibility in a court of law. Positive identification through radiographic comparison of antemortem and postmortem cranial suture patterns was evaluated in light of these criteria. The technique is based on reliable principles, but problems with terminology and the resolution of radiographs make Sekharan's method difficult to apply. Using the location, length, and slope of a suture's component lines, rather than Sekharan's descriptions of sutural configurations, it is possible to determine the probability of a particular suture pattern occurring in more than one individual. A match of four consecutive lines is sufficient to establish positive identification. This approach meets the Daubert and Mohan criteria, although resolution of radiographs is still a major limitation. Computed tomography (CT) scans may prove a more useful modality for positive identification, due to better resolution and greater availability. PMID:15027532

Rogers, Tracy L; Allard, Travis T



Role of the midpalatal suture in FEA simulations of maxillary expansion treatment for adolescents: a review.  


The overall goal of this review was to observe how the material properties of the unfused midpalatal suture have been considered by researchers in finite element analyses of maxillary expansion. Literature from Scopus, PubMed, and Biosis were all considered. Upon completion of the review, it was found that researchers assumed the suture to be vacant, have the same elastic properties as bone, or have elastic properties indicative of soft tissues. By performing a simplified analysis of the maxilla complex during expansion, it is shown that the suture may have a significant influence on treatment outcome. As a result, despite valuable contributions from previous studies, it would be ideal to incorporate a more representative model of the midpalatal suture into finite element simulations. PMID:23537640

Romanyk, Dan L; Collins, Caroline R; Lagravere, Manuel O; Toogood, Roger W; Major, Paul W; Carey, Jason P



Prospective Comparison of Arthroscopic Medial Meniscal Repair TechniqueInside-Out Suture Versus Entirely Arthroscopic Arrows  

Microsoft Academic Search

Background: Medial meniscal repairs are commonly performed with inside-out sutures and entirely arthroscopic with arrows, but few comparative evaluations on failures have been performed.Hypothesis: No differences in failure rates exist between medial meniscal repairs performed with inside-out suture or entirely arthroscopic at the time of anterior cruciate ligament reconstruction.Study Design: Prospective cohort study.Materials: A single surgeon performed 47 consecutive inside-out

Kurt P. Spindler; Eric C. McCarty; Todd A. Warren; Clinton Devin; Jason T. Connor



Electromagnetic images of the deep structure of the Trans-European Suture Zone beneath Polish Pomerania  

Microsoft Academic Search

A large-scale international electromagnetic experiment has been carried out in northwest Poland and northeast Germany. The main goal was to study the deep conductivity structure across the Trans-European Suture Zone, which is the most prominent tectonic structure of Phanerozoic age in Europe. Electromagnetic measurements were carried out mainly along seismic profiles P2, LT-7, and LT-2 crossing the suture zone and

Tomasz Ernst; Heinrich Brasse; Vaclav Cerv; Norbert Hoffmann; Jerzy Jankowski; Waldemar Jozwiak; Anja Kreutzmann; Anne Neska; Nikolay Palshin; Laust Börsting Pedersen; Maxim Smirnov; Elena Sokolova; Ivan Mikhail Varentsov



Effects of UV-B Radiation on a Hereditary Suture Cataract in Mice  

Microsoft Academic Search

UV-B (290–320 nm, ?max=305 nm) radiation and the Cat2ns(suture cataract) mutation in mice affect both the anterior lens epithelium and the formation of the suture. A low dose of UV-B radiation (2.2 Jcm?2) induces similar anterior subcapsular and cortical lens opacities in wild type as in heterozygous mutant mice. The UV-B treatment of the mutant lenses, however, leads to an




[Buried suture of the bladder in the surgical treatment of urethral stricture].  


Surgical treatment for posttraumatic urethral stricture was carried out in 316 patients: tunneling in 42, Marion-Khol'tsov [correction of Kholtrov] operation with circular drainage in 185, tight suture of the bladder with transurethral drain using double-opening tube in 86 cases. Complications emerged in 28 patients. The best short- and long-term outcomes were obtained in the group subjected to tight suturing. PMID:1755127

Ra?kevich, N P; Mitriaev, Iu I; Soldatenko, M V


From simple interrupted to complex spiral: a systematic review of various suture techniques for microvascular anastomoses.  


Accomplishing successful microvascular anastomoses is undoubtedly one of the most critical steps in performing free tissue transfer. However, the ideal technique has often been a subject of debate. Therefore, our objective was to review the current literature in an attempt to find objective evidence supporting the superiority of one particular technique. A PubMed and OVID on-line search was performed in November 2007 using the following keywords: microvascular anastomoses, microsurgical anastomosis, continuous suture, interrupted suture, mattress suture, and sleeve anastomosis. Our literature review found no difference in short- and/or long-term patency rates between the six main published techniques, which includes continuous suture, interrupted suture, locking continuous, continuous horizontal, horizontal interrupted with eversion, and sleeve anastomoses. These findings were consistent for each technique as long as the microsurgeon maintained standard microsurgical principles and practice, including suture line eversion, minimized tension, and direct intima-to-intima contact. Current literature supports no overall statistical difference in short- and/or long-term patency rates between any of the various techniques. The choice to perform one suture technique over another ultimately depends on the plastic surgeon's preference and microsurgical experience. To date, there are no human randomized, controlled clinical trials comparing the efficacy and clinical outcomes of each of the various suture techniques, and therefore one's comfort and familiarity should dictate his or her microsurgical technique. However, "exposure to many and mastery of one" simply provides the plastic surgery resident, fellow, or staff the technical flexibility needed for less-complicated surgical planning when performing free tissue transfer. PMID:21207502

Alghoul, Mohammed S; Gordon, Chad R; Yetman, Randal; Buncke, Gregory M; Siemionow, Maria; Afifi, Ahmed M; Moon, Wong K



[Complex prevention of suture incompetence of the duodenal stump in penetrating duodenal ulcers].  


Data on 323 patients operated upon for penetrating duodenal ulcers (resection of the stomach) are presented. New procedures are described which elevate hermeticity of the duodenal stump as well as prophylactic measures against incompetence of sutures of the duodenum stump. Six patients had incompetent sutures of the duodenum stump which was of limited character and was completed by the formation of a duodenal fistula. Lethality from this complication was not noted. PMID:2665306

Godlevski?, A I



Delayed primary suture of flexor tendons cut in the digital theca.  


The results of delayed primary suture of flexor tendons cut in the digital theca in twenty five patients, thirty three affected fingers, are given. The patients had their skin closed at another hospital immediately after the injury. One to six days later the skin stitches were removed and tendon suture was performed. Excellent and very good results are obtained in 79.7% of all thirty three fingers operated upon. PMID:6997144

Matev, I; Karagancheva, S; Trichkova, P; Tsekov, P



Normal palatal sutures in newborns and fetuses: a critical fact for successful palatal distraction.  


Distraction osteogenesis (DO) has recently been applied to the palate. Successful posterior lengthening and medial advancement of the palates was continuously reported. Based on these studies, it is obvious that DO will play a major role in the management of problems related to palatal defects in the near future. Although the results are appealing, they may not be applicable for humans due to anatomic differences. All experimental studies used normal palatal sutures of young dogs for size expansion. Therefore, it is necessary to know normal palatal sutures in infants before one can clinically apply this new technique. With consent, palates of fetuses and neonates who died of various causes were examined. Eight fresh cadavers were available for the dissection, with two being skeletonized using the boiling process. There were three fetal deaths in utero (33-41 weeks of gestational age) and five postnatal deaths (aged between 5 hours and 6 months). All specimens were grossly normal in shape and size except for one with a unilateral complete cleft of lip and palate. A midline palatal suture was found in every noncleft specimen, while premaxillary and transverse palatomaxillary sutures were present in every specimen. Laterally, there was no true suture except for the most posterior portion, which was contiguous with the greater palatine foramen. The palatal sutures of third-trimester fetuses and neonates are not different from adult ones. There is no lateral suture that will allow distraction in the medial direction. It is only the posterior hard palate (palatine bones) that can potentially be moved medially and posteriorly by sutural expansion with DO. PMID:12867856

Rojvachiranonda, Nond; Tansatit, Tanvaa; Siriwan, Pichit; Mahatumarat, Charan



The lithospheric trace of the Iapetus Suture in SW Ireland from teleseismic data  

Microsoft Academic Search

The Caledonian Iapetus Suture is a tectonic boundary resulting from the amalgamation in a three-plate configuration of Laurentia and Baltica with Avalonia. In SW Ireland, seismic stations on a wide-angle seismic profile crossing the postulated path of the Iapetus Suture have recorded a set of teleseismic events. The P-wave residual times for an earthquake in the Aleutians (end-on to the

F. Masson; F. Hauser; A. W. B. Jacob



Evaluation of sutures after immersion in nonalcoholic benzydamine hydrochloride mouthrinse by scanning electron microscopy  

Microsoft Academic Search

This study evaluated the surface integrity of sutures after immersion in mouthrinse or water, by scanning electron microscopy\\u000a (SEM) analysis. Pieces of resorbable suture remaining after oral surgery were immediately collected. Twelve pieces each of\\u000a catgut, chromed catgut, and polyglactin 910 were divided into four groups and immersed in pure mouthrinse, mouthrinse diluted\\u000a in water at 1:1 and 1:2, or

Gisele da Silva Dalben; Leda Aparecida Francischone; Paula Prieto-Oliveira; Alberto Consolaro



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

Microsoft Academic Search

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

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



The Kolar Schist Belt: A possible Archaean suture zone  

NASA Astrophysics Data System (ADS)

The Kolar Schist Belt represents a N-S trending discontinuity in the structures, lithologies, and emplacement and metamorphic ages of late Archean gneisses. The suggestion of a much older basement on the west side of the belt is not seen on the east. Within the schist belt amphibolites from each side have distinctly different chemical characteristics, suggesting different sources at similar mantle depths. These amphibolites were probably not part of a single volcanic sequence, but may have formed about the same time in two completely different settings. Could the amphibolites with depleted light REE patterns represent Archean ocean floor volcanics which are derived from a mantle source with a long term depletion of the light REE? Why are the amphibolites giving an age which may be older than the exposed gneisses immediately on either side of the belt? These results suggest that it is necessary to seriously consider whether the Kolar Schist Belt may be a suture between two late Archean continental terranes.

Hanson, G. N.; Krogstad, E. J.; Ragamani, V.; Balakrishnan, S.


Investigation of the best suture pattern to close a stuffed Christmas turkey.  


Instructions on how to debone and stuff a turkey are available, but what is the best way to close it up? A randomised trial involving 15 turkeys was performed in order to evaluate skin disruption scores and cosmetic outcomes following the use of different suture patterns. Turkeys were deboned, stuffed and cooked according to guidelines of the US Department of Agriculture Food Safety and Inspection Services. After stuffing, they were randomly assigned to one of five closure groups: simple continuous Lembert; simple continuous Cushing; simple continuous Utrecht; simple continuous; or staples. Turkeys were cooked at 180 °C for two hours ensuring core temperature reached 75 °C. Suture line integrity was evaluated after removal of the sutures and the cosmetic aspect was graded. Before cooking, the Utrecht pattern and skin staples offered the best cosmetic result. After removal of the sutures, the skin remained intact only in the stapled group. All other suture patterns disrupted the skin after removal of the sutures, rendering the turkey less cosmetically appealing for serving. Closure of a stuffed turkey was best performed using skin staples to achieve the best cosmetic results. Using this technique you will be able to impress family and friends at a Christmas dinner, and finally show them your surgical skills. PMID:22193586

Verwilghen, D; Busoni, V; van Galen, G; Wilke, M


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

SciTech Connect

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

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



Liquid crystal tunable metamaterial absorber.  


We present an experimental demonstration of electronically tunable metamaterial absorbers in the terahertz regime. By incorporation of active liquid crystal into strategic locations within the metamaterial unit cell, we are able to modify the absorption by 30% at 2.62 THz, as well as tune the resonant absorption over 4% in bandwidth. Numerical full-wave simulations match well to experiments and clarify the underlying mechanism, i.e., a simultaneous tuning of both the electric and magnetic response that allows for the preservation of the resonant absorption. These results show that fundamental light interactions of surfaces can be dynamically controlled by all-electronic means and provide a path forward for realization of novel applications. PMID:23679774

Shrekenhamer, David; Chen, Wen-Chen; Padilla, Willie J



Origin of the Rheic Ocean: Rifting along a Neoproterozoic suture?  

NASA Astrophysics Data System (ADS)

The Rheic Ocean is widely believed to have formed in the Late Cambrian Early Ordovician as a result of the drift of peri-Gondwanan terranes, such as Avalonia and Carolina, from the northern margin of Gondwana, and to have been consumed in the Devonian Carboniferous by continent-continent collision during the formation of Pangea. Other peri-Gondwanan terranes (e.g., Armorica, Ossa-Morena, northwest Iberia, Saxo-Thuringia, Moldanubia) remained along the Gondwanan margin at the time of Rheic Ocean formation. Differences in the Neoproterozoic histories of these peri-Gondwanan terranes suggest the location of the Rheic Ocean rift may have been inherited from Neoproterozoic lithospheric structures formed by the accretion and dispersal of peri-Gondwanan terranes along the northern Gondwanan margin prior to Rheic Ocean opening. Avalonia and Carolina have Sm-Nd isotopic characteristics indicative of recycling of a juvenile ca. 1 Ga source, and they were accreted to the northern Gondwanan margin prior to voluminous late Neoproterozoic arc magmatism. In contrast, Sm-Nd isotopic characteristics of most other peri-Gondwanan terranes closely match those of Eburnian basement, suggesting they reflect recycling of ancient (2 Ga) West African crust. The basements of terranes initially rifted from Gondwana to form the Rheic Ocean were those that had previously accreted during Neoproterozoic orogenesis, suggesting the rift was located near the suture between the accreted terranes and cratonic northern Gondwana. Opening of the Rheic Ocean coincided with the onset of subduction beneath the Laurentian margin in its predecessor, the Iapetus Ocean, suggesting geodynamic linkages between the destruction of the Iapetus Ocean and the creation of the Rheic Ocean.

Brendan Murphy, J.; Gutierrez-Alonso, Gabriel; Damian Nance, R.; Fernandez-Suarez, Javier; Keppie, J. Duncan; Quesada, Cecilio; Strachan, Rob A.; Dostal, Jarda



The B-Lynch uterine brace suture, and a bit of this and a bit of that...  


The widespread application of the B-Lynch brace suture to control postpartum hemorrhage has sparked interest in a variety of adjunctive methods, used alone or in combination, to control uterine bleeding. Although the B-Lynch brace suture has been used with good results throughout the world, failures can and do occur in rare instances, especially when the suture is incorrectly placed for use for an inappropriate indication. Four reports of additional methods to control postpartum hemorrhage are published in this issue of IJGO. Three use the B-Lynch brace suture combined with other techniques. The need for additional techniques reminds the reader of the importance of proper suture application for proper indication. Potential reasons for failure of the B-Lynch suture are provided. PMID:20070962

Karoshi, Mahantesh



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

PubMed Central

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 identifier NCT01146236 (registered June 14, 2010)



Improved ocular alignment with adjustable sutures in adults undergoing strabismus surgery  

PubMed Central

Objective To assess whether outcomes of strabismus surgery are improved by using the adjustable suture technique and to determine which subgroups of strabismus patients benefit most from the adjustable suture technique. Design A retrospective chart review. Participants Five hundred thirty-five adults who had strabismus surgery between 1989–2010. Methods Success was defined as ?10 prism diopters (PD) for horizontal deviations and ?2 PD for vertical deviations. Differences in the proportion of successful strabismus surgery were analyzed using a chi-square test with an alpha of 0.05. Main outcome measures Ocular alignment in primary position at a 7-day to 12-week follow-up examination. Results 491 patients met the inclusion criteria (adjustable suture, n=305; non-adjustable, n=186). The success rates for non-adjustable and adjustable groups were 61.3% and 74.8% respectively (?2=9.91, p=0.0016). Adjustable suture use was particularly beneficial for patients undergoing a reoperation for childhood strabismus (success rate: non-adjustable, 42.4%; adjustable, 65.7% p=0.0268; n=100). The differences in outcomes were not statistically significant for patients with childhood strabismus undergoing a primary surgery (non-adjustable, 65.0%; adjustable, 81.4% p=0.1354; n=90) or with thyroid orbitopathy (non-adjustable, 76.7%; adjustable, 74.1% p=0.8204; n=57). Conclusions Strabismus surgery using adjustable sutures was associated with improved short-term ocular alignment compared to strabismus surgery without the use of adjustable sutures. Adjustable sutures were most beneficial for patients undergoing reoperations for childhood strabismus.

Zhang, Monica S.; Hutchinson, Amy K.; Drack, Arlene V.; Cleveland, Julia; Lambert, Scott R.



ANL Advanced Photon Source crotch absorber design  

Microsoft Academic Search

The ANL 7 GeV Advanced Photon Source storage ring crotch absorber will be subjected to a very high photon loading power density, approximately 750 w\\/mm2 at normal incidence. To accommodate this high heat load, two designs are studied: a V-type compound angle absorber and a horizontally rotated plate absorber. For both model, thermal and structural analyses have been carried out

M. Choi; J. D. Gonczy; J. W. Howell; R. C. Niemann



Evaluation of dental extractions, suturing and INR on postoperative bleeding of patients maintained on oral anticoagulant therapy  

Microsoft Academic Search

Objectives To examine the consequences of temporary withdrawal of warfarin and\\/or suturing on bleeding and healing pattern following dental extractions.Methods Two hundred and fourteen patients on long-term oral anticoagulation (warfarin) therapy scheduled for dental extraction were randomly divided into four groups: no suturing and discontinued (group 1) or continued warfarin (group 2), and suturing and discontinued (group 3) or continued

N. Al-Ali; M. Abou Rass; A. Al-Sohail; A. Robert; K. Al-Zoman; A. Al-Suwyed; S. Ciancio; S. Al-Mubarak



Entropion correction by fornix-based suture placement: use of the Quickert-Rathbun technique in ten dogs  

Microsoft Academic Search

The objective of this study was to evaluate fornix-based suture placement as a method for entropion correction in the dog. Lower eyelid entropion with resultant trichiasis was corrected in 10 dogs using fornix-based suture placement similar to that employed in the Quickert-Rathbun technique used in man. A double-ended suture was placed originating at the deepest extent of the fornix and

David L. Williams



Hexaferrite contribution to microwave absorbers characteristics  

NASA Astrophysics Data System (ADS)

The influence is studied of Co-Ti substituted Ba hexaferrite on the efficiency of the hexaferrite-magnetite-graphite triple absorbing system of fillers dispersed in a rubber matrix. Using the planned experiment technique, the optimal ratio is determined of its components, as well as their influence on the absorber's optimal thickness. The introduction of a hexaferrite in the system improves the composite absorbing properties manifested mostly in broadening the maximal absorption frequency band. It is assumed that the presence of the hexaferrite results in improving the long-range order of the absorbing fillers arrangement in the polymer matrix.

Dishovski, N.; Petkov, A.; Nedkov,, IV; Razkazov,, IV



A planar polarization-insensitive metamaterial absorber  

NASA Astrophysics Data System (ADS)

The model of the polarization-insensitive metamaterial (MM) absorber composed of split cross-ring resonator (SCRR), cave-cross resonator (CCR) and dielectric substrate was proposed at microwave frequencies. Based on perfect impedance-matched (z˜(?)=1) to the free space, the single unit cell could achieve near-unity absorbance by properly assembling the sandwich structure. We have simulated and measured the reflectivity and transmission properties of a planar MM absorber with the thickness of 0.6 mm. The absorptivity of a single layer MM absorber achieve greater than 96% around 10.07 GHz in experiments and 98% in simulations for incident electromagnetic (EM) wave with different polarizations.

Cheng, Yongzhi; Yang, Helin; Cheng, Zhengze; Xiao, Boxun



Can Suture Repair of ACL Transection Restore Normal Anteroposterior Laxity of the Knee? An Ex Vivo Study  

PubMed Central

INTRODUCTION Recent work has suggested the transected ACL can heal and support reasonable loads if repaired with sutures and a bioactive scaffold; however, use of a traditional suture configuration results in knees with increased AP laxity. The objective was to determine whether one of five different suture repair constructs when performed at two different joint positions would restore normal AP knee laxity. METHODS AP laxity of the porcine knee at 60° of flexion was evaluated for five suture repair techniques. Femoral fixation for all repair techniques utilized a suture anchor. Primary repair was to either the tibial stump, one of three bony locations in the ACL footprint, or a hybrid bony fixation. All five repairs were tied with the knee in first 30° and then 60° of flexion for a total of 10 repair constructs. RESULTS Suture repair to bony fixation points within the anterior half of the normal ACL footprint resulted in knee laxity values within 0.5 mm of the ACL-intact joint when the sutures were tied with the knee at 60° flexion. Suture repair to the tibial stump, or with the knee at 30° of flexion, did not restore normal AP laxity of the knee. CONCLUSIONS Three specific suture repair techniques for the transected porcine ACL restored the normal AP laxity of the knee at the time of surgery. Additional studies defining the changes in laxity with cyclic loading and in vivo healing are indicated.

Fleming, Braden C.; Carey, James L.; Spindler, Kurt P.; Murray, Martha M.



Physical and biologic impermeability of intestinal sutures in the first twenty-four hours after operations on the gastrointestinal tract.  


The author has substantiated a concept that in the general notion of the impermeability of intestinal sutures, it is necessary to distinguish between physical impermeability (imperviousness of sutures to liquids and gases) and biologic impermeability (imperviousness of sutures to microbes and toxins). It was established in experiments on 165 dogs that infection that invaded peritoneum during operation disappeared from the peritoneal cavity within an hour of small-bowel and stomach surgery and within 1 1/2 hours of colon surgery. Then a period of sterility of peritoneum was observed, which lasted for 8 to 9 hours after operations on the stomach and the small bowel (p = 0.01) and for 4 to 7 hours after operations on the colon (p = 0.01). In the following hours the peritoneal cavity was infected through physically hermetic intestinal sutures. At the end of 24 hours the peritoneum of operated organs showed the presence of 10(4) to 10(6) intestinal microbes. Greater omentum, bowel loops, and their mesentery adhered to the suture in response to the infection through the suture. Complete covering of the suture with adjacent viscera prevented infection of the peritoneal cavity through the suture. The author suggests a well-grounded concept of the leading role of infection through a physically hermetic intestinal suture in the development of postoperative peritonitis and peritoneal adhesions. PMID:1440248

Zaporozhets, A A



Delivery of Transforming Growth Factor-?3 Plasmid in a Collagen Gel Inhibits Cranial Suture Fusion in Rats.  


Objective :? Studies described in this paper were designed to test the hypothesis that an increase in nonviral, plasmid-encoded Tgf-?3 production, localized to the rat posterior frontal suture, prevents programmed suture fusion. Design :? We developed a gene delivery system based on a dense collagen gel to deliver nonviral plasmids that encode for Tgf-?3. Studies were performed to test the ability of this system to rescue rat cranial suture fusion in vitro and in vivo. Immunohistochemical studies were conducted to characterize the possible mechanisms by which increased production and presence of Tgf-?3 protein interferes with suture fusion. Results :? Posterior frontal sutures in the Tgf-?3 plasmid-treated group exhibited 77% to 85% less bony bridging than the collagen control and untreated groups after 15 days in culture. In animals treated with Tgf-?3 plasmid or Tgf-?3 protein, there was a significant reduction in suture fusion in the middle region of the posterior frontal sutures when compared with control groups. In this region the Tgf-?3 plasmid-treated group revealed 70% to 75% less bony bridging than control groups in vivo. Conclusions :? Collagen gel can be formulated to provide release of nonviral plasmid DNA that results in cell transfection and elevated Tgf-?3 protein production. Tgf-?3 is an important regulator of suture fusion, and an increase in plasmid-encoded Tgf-?3 protein is effective in inhibiting programmed suture fusion in rats. PMID:22577795

Premaraj, Sundaralingam; Moursi, Amr M



Device for absorbing mechanical shock  


This invention is a comparatively inexpensive but efficient shock-absorbing device having special application to the protection of shipping and storage cylinders. In a typical application, two of the devices are strapped to a cylinder to serve as saddle-type supports for the cylinder during storage and to protect the cylinder in the event it is dropped during lifting or lowering operations. In its preferred form, the invention includes a hardwood plank whose grain runs in the longitudinal direction. The basal portion of the plank is of solid cross-section, whereas the upper face of the plank is cut away to form a concave surface fittable against the sidewall of a storage cylinder. The concave surface is divided into a series of segments by transversely extending, throughgoing relief slots. A layer of elastomeric material is positioned on the concave face, the elastomer being extrudable into slots when pressed against the segments by a preselected pressure characteristic of a high-energy impact. The compressive, tensile, and shear properties of the hardwood and the elastomer are utilized in combination to provide a surprisingly high energy-absorption capability.

Newlon, Charles E. (Knoxville, TN)



Device for absorbing mechanical shock  

SciTech Connect

This invention is a comparatively inexpensive but efficient shock-absorbing device having special application to the protection of shipping and storage cylinders. In a typical application, two of the devices are strapped to a cylinder to serve as saddle-type supports for the cylinder during storage and to protect the cylinder in the event it is dropped during lifting or lowering operations. In its preferred form, the invention includes a hardwood plank whose grain runs in the longitudinal direction. The basal portion of the plank is of solid cross-section, whereas the upper face of the plank is cut away to form a concave surface fittable against the sidewall of a storage cylinder. The concave surface is divided into a series of segments by transversely extending, throughgoing relief slots. A layer of elastomeric material is positioned on the concave face, the elastomer being extrudable into slots when pressed against the segments by a preselected pressure characteristic of a high-energy impact. The compressive, tensile, and shear properties of the hardwood and the elastomer are utilized in combination to provide a surprisingly high energy -absorption capability.

Newlon, C.E.



Device for absorbing mechanical shock  


This invention is a comparatively inexpensive but efficient shock-absorbing device having special application to the protection of shipping and storage cylinders. In a typical application, two of the devices are strapped to a cylinder to serve as saddle-type supports for the cylinder during storage and to protect the cylinder in the event it is dropped during lifting or lowering operations. In its preferred form, the invention includes a hardwood plank whose grain runs in the longitudinal direction. The basal portion of the plank is of solid cross-section, whereas the upper face of the plank is cut away to form a concave surface fittable against the sidewall of a storage cylinder. The concave surface is divided into a series of segments by transversely extending, throughgoing relief slots. A layer of elastomeric material is positioned on the concave face, the elastomer being extrudable into slots when pressed against the segments by a preselected pressure characteristic of a high-energy impact. The compressive, tensile, and shear properties of the hardwood and the elastomer are utilized in combination to provide a surprisingly high energy-absorption capability.

Newlon, C.E.



Using finite-element analysis to investigate suture morphology: a case study using large carnivorous dinosaurs.  


Finite-element analysis (FEA) can be used to investigate the mechanical significance of sutures and regions of intracranial flexibility in skulls. By modeling the stress response to feeding forces in a finite-element skull model (with appropriate boundary conditions), one can compare the axis of distortion and orientation of stress and strain in the model to the degree of movement at actual sutural contacts in the real skull. Hypotheses detailing the effect of introducing patency or flexibility on mechanical performance can be constructed and subsequently tested. In this study, the correlation between stress environment, cranial strength, and sutural morphology and mobility is investigated in the cranium of the large theropod dinosaur Allosaurus fragilis. Theropods are an especially interesting model system as their skulls were massive (over 100 cm in some cases), may have generated extremely large bite forces, yet patent sutures persisted between many of the facial bones. In this analysis, it was discovered that Allosaurus cranial sutures appear generally capable of accommodating stress and strain patterns generated during biting. This study highlights the potential of FEA in devising and testing hypotheses of form and function and argues that useful information can be obtained from finite-element models of extinct animals, providing that adequate assumptions are made and appropriate questions asked. PMID:15751029

Rayfield, Emily J



Retrospective analysis of 697 septoplasty surgery cases: packing versus trans-septal suturing method.  


The trans-septal suturing method has been developed in septoplasty as an alternative to packing. This study was carried out to compare the postoperative results of trans-septal suturing with the anterior Merocel packing technique. The study involved 697 patients who underwent septoplasty. Following surgery, patients were randomly divided into two groups, one with trans-septal suturing and the other with Merocel packing. Patients were asked to record pain levels using a visual analogue scale. Postoperative symptoms and complications were compared. A total of 697 nasal operations were evaluated in the postoperative period considering pain, bleeding, haematoma, septal perforation synechiae and septal perforation. The results for haemorrhage, haematoma, synechiae and perforation were not statistically different (p > 0.05) between groups. In contrast, the level of postoperative pain in patients undergoing trans-septal suturing was significantly less than in the group who received Merocel packing (p < 0.05). Patients with Merocel packing had significantly more pain and nasal discomfort when assessed 1 week after intervention. Therefore, the trans-septal suturing technique may be the preferred option to provide higher patient satisfaction. PMID:22767972

Cukurova, I; Cetinkaya, E A; Mercan, G C; Demirhan, E; Gumussoy, M



The effect of the trabecular microstructure on the pullout strength of suture anchors.  


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

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



Creep rupture behavior of polypropylene suture material and its applications as a time-release mechanism.  


The controlled failure of polypropylene (PP) sutures is studied via creep rupture tests. From plots of log time (tB) vs. stress (sigma), linear relationships are generated over the failure times of 1-1000 h. Results show that as a function of stress, the time dependence varies with irradiation dose (15, 20, 25, and 50 Mrad), irradiation atmosphere (air and vacuum), suture diameter (7-0, 6-0, 5-0, and 4-0), and test temperature (26 and 37 degrees C). For a given stress, the time to failure is least for the greatest dose in the presence of air and at the highest temperature. When suture loops are wrapped around a small wire sheave, however, failure occurs in the largest suture as much as two decades sooner than the smallest suture studied. Within the limitations stated herein, they are independent of test method, loop diameter, aging, and humidity. Consequently, after irradiation in vacuum and postirradiation heat treatment, the processed material may be stored at room temperature for at least 1 month. Such materials are advocated when the time release of a dental or medical device is required, for example, in the self-activating cleft palate appliance. PMID:6345549

Kusy, R P; Whitley, J Q



Factors influencing wound complications: a clinical and experimental study.  

PubMed Central

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

Bucknall, T. E.



The design of broadband radar absorbing surfaces  

Microsoft Academic Search

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

Go H. Suk



Wideband thin resistive metamaterial radar absorbing screen  

Microsoft Academic Search

It has been demonstrated that two layer metamaterial Hilbert curve array constructed from low conductivity material can act as a thin wideband radar absorbing screen. The advantage of using Hilbert curve over traditional circuit analogue radar absorbing screen is the smaller unit cell size, resulting in reduced coupling to higher order Floquent modes and reduced diffraction effects, which in turn

A. Noor; Zhirun Hu; H. H. Ouslimani; A. Priou



Modelling of magnetic radar absorbing composites  

Microsoft Academic Search

This paper addresses the modelling of radar absorbing composite layers with ferromagnetic inclusions. The radar absorbing properties of these layers are strongly determined by the effective permeability of the composite material. The applicability of mixing formulas is discussed to determine the effective permeability. Furthermore, the RF-frequency behaviour of ferromagnetic inclusions is described. The mixing formulas and the RF-frequency behaviour of

Harmen Schippers; Tomas Lundin; Jaap Heijstek



Terahertz backscattering behavior of various absorbing materials  

Microsoft Academic Search

The Submillimeter-Wave Technology Laboratory (STL) at the University of Massachusetts Lowell has investigated the electromagnetic scattering behavior of various broadband absorbers. Several absorbing materials were tested in a compact radar range operating at a center frequency of 160 GHz. The polarimetric radar cross section was measured at elevation angles from 15° to 75°. In addition to the backscattering behavior, the

C. Wu; A. J. Gatesman; L. Deroeck; T. Horgan; R. H. Giles; W. E. Nixon



Orally Ingested Heparin Is Absorbed in, Humans  

Microsoft Academic Search

It has been accepted for many years that orally ingested heparin is not absorbed. Recent evidence has shown that heparin placed in the stomach of rats is very rapidly absorbed and that it also quickly and almost completely attaches to the vascular endothelium and prevents jugular vein thrombosis. Within 6 min, heparin was undetectable in the blood plasma. If a

Hyman Engelberg



Evaluation of commercial fuel tank water absorbers  

NASA Astrophysics Data System (ADS)

This report describes the laboratory evaluation of three types of commercial fuel tank water absorber cartridges and a limited field test of one type. Evaluation included absorbance effectiveness, possible deleterious effects on the fuel, and design integrity. Results are discussed together with the potential for use by the Army.

Williams, William R.



Gas absorber and refrigeration system using same  

Microsoft Academic Search

A refrigeration system is described comprising: (a) a separator for separating a refrigerant gas from a refrigerant-rich solution to produce a refrigerant-lean solution; (b) a condenser for emitting heat to thereby condense the refrigerant gas received from the separator and an evaporator for absorbing heat to thereby evaporate the condensed refrigerant gas; (c) an absorber assembly including: a precooler for




An Absorbing Boundary Condition Based on Anechoic Absorber For EM Scattering Computation  

Microsoft Academic Search

A novel absorbing boundary condition (ABC), to be used with finite difference and finite element electromagnetic radiation and scattering problems is described. It is based on anechoic chamber absorber foam geometry, with specified complex permittivity and permeability. The advantage of this absorbing boundary is that it prevents reflections from much wider incident angles than currently used lattice termination conditions. Since

C. M. Rappaport; L. J. Bahrmasel



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


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

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



Tungsten-rhenium suture needles with improved properties for coronary artery bypass graft surgery.  


Suture needles are essential instruments for performing blood vessel anastomosis in coronary artery bypass graft (CABG) surgeries. Exceptional needle performance is needed now as never before because of the increasing prevalence of elderly patients with advanced stages of coronary disease and calcified tissue. The various properties that affect the performance of suture needles used in CABG surgery are reviewed and recent progress towards improving needle performance through the use of tungsten-rhenium alloys and novel lubricous needle coatings is presented. Substantial enhancement of properties beyond those exhibited by commercially available stainless steel suture needles has been made, including an approximate 40% increase in strength, 100% increase in stiffness, and superior multiple pass penetration performance in both synthetic rubber media and human cadaver carotid arteries (p < 0.01). PMID:20574974

Cichocki, Frank R; Maurer, Robert E; Bar, S Neil



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

SciTech Connect

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.

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



Repair of lumbar dural tears with a suture patch: retrospective single-surgeon case series.  


Dural tears traditionally have been treated with repair and then flat bed rest of variable duration. We conducted a study to evaluate the outcome of treating dural tears with a suture patch and immediate mobilization. Fifty patients (28 male, 22 female) had a lumbar dural tear repaired with suture patch and immediate mobilization. Mean age was 58.9 years (range, 31-81 years). Medical records were reviewed to determine the rate of signs and symptoms: headache, photophobia, tinnitus, neck pain, incisional fluctuance, wound drainage, and return to operating room. No patients reported postoperative headache, photophobia, tinnitus, or neck pain. No patients developed wound fluctuance or drainage. One patient was treated medically for a superficial wound infection. No patients required return to the operating room. Dural repair with suture patch appears to be effective and allows early mobilization. PMID:24078970

Anderson, D Greg; Popov, Victor



Premaxillary-maxillary suture asymmetry in a juvenile Gorilla. Implications for understanding dentofacial growth and development.  


A specimen of juvenile gorilla was found that had the premaxillary-maxillary suture coursing between the lateral deciduous incisor and deciduous canine on one side of the jaw, but between the central and lateral deciduous incisors on the other; in the latter, the suture also separates the alveolus of the lateral deciduous incisor from the crypt of the growing successional lateral incisor. Rather than dismiss this exception to the traditional dictum of tooth identification--which is based on the position to teeth relative to this suture--as some inconsequential anomaly, an attempt is made to understand how this can occur within the confines of present understanding of dentofacial growth and development and developmental theory. An hypothesis relating tooth and tooth class identification is presented in the context of ectomesenchymally predifferentiated stem progenitors and subsequent tooth class proliferation. PMID:6862325

Schwartz, J H



The human incisal suture and premaxillary area studied on archaeologic material.  


The purpose of this study was to investigate the extent of the incisal suture, the size of the premaxillary area, and the developmental status of the dentition. Sixty-three medieval crania were examined: 30 from children and 33 from adults, including 5 cases with tooth deviations. All crania were photographed at a 1:1 scale. From the photographs the size of the premaxilla and the length of the incisal suture were measured. In addition, the spatial conditions in the anterior region were recorded. The study showed that the main closure of the suture takes place shortly after the crowns of the permanent incisors have attained their final width size. The mean size of the premaxillary area was larger in individuals with interincisal spacing and smaller in individuals with crowding when comparing with normal spatial conditions. In the cases of tooth agenesis the premaxillary areas were markedly reduced. PMID:8342405

Sejrsen, B; Kjaer, I; Jakobsen, J



Trans-sutural distraction osteogenesis for alveolar cleft repair: an experimental canine study.  


Objective : To explore a new method of repair of alveolar cleft by trans-sutural distraction osteogenesis. Design : Nine 8-week-old mongrel dogs were assigned randomly to two groups with three in the control group and six in the experimental group. Setting : First, an alveolar cleft model was created surgically in all animals. After 2 weeks, a U-shaped distractor, made of nickel-titanium (NiTi) shape memory alloy wire with 200 g tensile force, was inserted into the premaxilla of the experimental dogs to distract the mid-premaxillary suture for 3 weeks. Periosteoplasty of the alveolar cleft was performed when the premaxilla at the side of cleft approached the maxilla at the same side. The distractor was removed 2 weeks post periosteoplasty. Outcome Measures : The results were evaluated clinically, radiographically, and morphologically. Results : The cleft model was stable and similar to the human alveolar cleft. No spontaneous bone union occurred in the control. In experimental dogs, the premaxilla was moved slowly toward the maxilla, and the cleft became gradually narrower and closed in the third week. Radiographically, the distracted mid-premaxillary suture showed a gradually widened triangle, with the tip of the triangle pointed posteriorly. The density of the distracted triangle suture was increased gradually. The alveolar cleft was completely bony 3 months post periosteoplasty. The morphology of the mid-premaxillary suture was also restored. Conclusion : The alveolar cleft could be repaired by the technique of mid-premaxillary suture distraction using the elastic device of NiTi shape memory alloy. PMID:21806476

Liang, Limin; Liu, Chunming



Plate fixation of premaxillomaxillary suture and compensatory midfacial growth changes in the rabbit.  


It has been suggested that rigid fixation of the developing craniofacial skeleton may lead to altered craniofacial growth. However, recent experimental studies have shown that microplate fixation of slow-growing calvarial sutures resulted in regional growth disturbances but had little effect on overall craniofacial growth. The present study was designed to assess the effects of microplate fixation of the more rapidly growing facial sutures on compensatory midfacial growth in the rabbit. Twenty-two 1.5-week-old rabbits were randomly divided into 2 groups: sham controls (n = 11) and animals with bilateral premaxillomaxillary suture fixation (n = 11). Fixation was accomplished using an intraoral approach, a 6-mm straight Luhr microplate, and two 2-mm long self-tapping screws across each suture. Serial lateral head radiographs were collected at 1.5, 3.5, 6, 12, and 18 weeks of age. Results revealed that by 3.5 weeks, animals with rigid fixation showed significantly shortened premaxillary lengths (p < 0.05), class III occlusal relationships, decreased midfacial heights, and abnormal palatocranial base angles compared with sham control animals. By 12 weeks of age, "catch-up" growth was evident in most dimensions in animals with fixation compared with shams. Gross examination of the cleaned and dried skulls revealed bony bridging across the premaxillomaxillary suture and osseous fracture lines extending superiorly from the site of screw fixation. Results demonstrated that rigid fixation of a rapidly growing facial suture did not impair long-term midfacial growth in the rabbit model and suggest that compensatory changes may have occurred at fracture lines from the self-tapping screws in these animals. PMID:1298421

Mooney, M P; Losken, H W; Siegel, M I; Tsachakaloff, A; Losken, A; Janosky, J



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

Microsoft Academic Search

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,

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



Leyla loop: a time-saving suture technique for robotic atrial closure.  


The longer durations of cardiopulmonary bypass and aortic cross-clamp times remain the disadvantages of robotic or minimally invasive cardiac surgery. For this reason, every small contribution to speeding up these procedures is of the utmost importance. Here, we present a practical, easy and time-saving suture technique for atrial closure. It consists of a hand-made loop at one end of the suture and saves the time otherwise consumed by knotting. It may also be used during conventional or minimally invasive cardiac surgery. PMID:23760357

Kiliç, Leyla; Senay, Sahin; Umit Güllü, A; Alhan, Cem



Prolonged bleeding due to a medicinal leech bite: another treatment method, primary suture.  


Medicinal leeches have been used in the treatment of many diseases for thousands of years. A 25-year-old man presented to our emergency department with bleeding from right and left side of his neck. He had applied leeches 10 h previously to both sides of his neck to treat acne. The bleeding was not controlled by applying pressure with sterile gauze upon the wounds. Homeostasis was achieved by primary suture under local anaesthesia. Prolonged bleeding can be seen following medical leech application. In such cases, bleeding can be controlled by primary suture. PMID:22802561

Zengin, Suat; Yarbil, Pinar; Kilic, Hasan; Al, Behçet



Transfascial suture hernia: a rare form of recurrence after laparoscopic ventral hernia repair.  


Laparoscopic repair of ventral or incisional hernia is among the most commonly performed minimally invasive procedures. Different modes of recurrence have been reported in literature, including missed defects, mesh migration, mesh infection, etc. Transfascial suture fixation in addition to tackers is an established method to prevent recurrence due to mesh migration. We report possibly the third case of recurrent ventral hernia with multiple defects at transfascial suture sites of previous laparoscopic ventral hernia mesh repair. The patient was treated by laparoscopy with a large intraperitoneal PROCEED mesh, covering the new hernia defects and older mesh. PMID:20874415

Khandelwal, Radha Govind; Bibyan, Monika; Reddy, Prasanna K



Robot-assisted laparoscopic mesh repair of incisional hernias with exclusive intracorporeal suturing: a pilot study  

Microsoft Academic Search

Background  The da Vinci robot laparoscopic incisional hernia repair with intracorporeal suturing may offer an alternative to transabdominal\\u000a sutures and tackers.\\u000a \\u000a \\u000a \\u000a Methods  From 2003 to 2005, 11 patients (median age, 71 years; median body mass index [BMI], 28) with small and medium-sized incisional\\u000a hernias (median fascial defect, 19.6 cm2) were treated with the da Vinci robot system using intracorporeal mesh fixation with

C. Tayar; M. Karoui; D. Cherqui; P. L. Fagniez



Early visual rehabilitation following keratoplasty using a single continuous adjustable suture technique.  


We measured postkeratoplasty visual acuity, refraction, retinoscopy, keratometry, and corneal topography in 105 patients, in 33 of whom an adjustable continuous technique had been used, and in 72 of whom a standard technique (in which the continuous suture was not adjusted) had been used. In the eyes in which the sutures were adjusted (within 6 weeks following surgery), acuity improved (preadjustment mean, 20/205; postadjustment mean, 20/100), and astigmatism decreased (preadjustment mean, 8.41 diopters; postadjustment mean, 2.22 D). Visual acuity and astigmatism in the control group were unchanged at the same point after surgery. PMID:2057184

Temnycky, G O; Lindahl, K J; Aquavella, J V; Erdey, R A



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

Microsoft Academic Search

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

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



A sensitivity analysis to the role of the fronto-parietal suture in Lacerta bilineata: a preliminary finite element study.  


Cranial sutures are sites of bone growth and development but micromovements at these sites may distribute the load across the skull more evenly. Computational studies have incorporated sutures into finite element (FE) models to assess various hypotheses related to their function. However, less attention has been paid to the sensitivity of the FE results to the shape, size, and stiffness of the modeled sutures. Here, we assessed the sensitivity of the strain predictions to the aforementioned parameters in several models of fronto-parietal (FP) suture in Lacerta bilineata. For the purpose of this study, simplifications were made in relation to modeling the bone properties and the skull loading. Results highlighted that modeling the FP as either an interdigitated suture or a simplified butt suture, did not reduce the strain distribution in the FP region. Sensitivity tests showed that similar patterns of strain distribution can be obtained regardless of the size of the suture, or assigned stiffness, yet the exact magnitudes of strains are highly sensitive to these parameters. This study raises the question whether the morphogenesis of epidermic scales in the FP region in the Lacertidae is related to high strain fields in this region, because of micromovement in the FP suture. PMID:23192831

Moazen, Mehran; Costantini, David; Bruner, Emiliano



Repairs by Trephination and Suturing of Longitudinal Injuries in the Avascular Area of the Meniscus in Goats  

Microsoft Academic Search

Trephination may encourage healing of a tear in the avascular area of the meniscus, but healing may not be complete in unstable tears. We studied trephination with suture of longitudinal injuries in the avascular area of the medial meniscus in 20 goats; samples were studied at 3, 8, and 25 weeks. All 20 tears treated by trephination and suture were

Zhongnan Zhang; James A. Arnold; Tom Williams; Biff McCann



Glucose Metabolism in the Visual Structures of Rat Monocularly Deprived by Eyelid Suture after Postnatal Eye Opening  

Microsoft Academic Search

Purpose To determine the changes in the visual centers of rats following monocular visual deprivation after postnatal eyelid opening (PEO). Methods Monocular eyelid suture was performed on rats on days 1, 3, 5, 7, 14, and 28 after PEO, and the glucose metabolism was measured 1, 2, 5, and 7 days after the eyelid suture. Ex vivo autoradiography with 14C-

Wei-Fang Wang; Motohiro Kiyosawa; Kiichi Ishiwata; Manabu Mochizuki



Results of a combined adjustable recession and posterior fixation suture of the same vertical rectus muscle for incomitant vertical strabismus  

Microsoft Academic Search

Purpose: The posterior fixation suture (fadenoperation) is an effective treatment for complicated incomitant vertical strabismus. Traditional operative methods do not permit the simultaneous use of an adjustable recession of the same muscle. Methods: Seven patients with incomitant vertical strabismus and diplopia were treated with a combined adjustable recession and posterior fixation suture of the same vertical rectus muscle. Preoperative vertical

Darren L. Hoover



Mothers' and fathers' reports of stress in families of infants with and without single-suture craniosynostosis.  


Objective : To compare relative levels of stress reported by mothers and fathers in families containing infants with and without single-suture craniosynostosis. Design : Case-control study. Participants : Mothers and fathers of 246 infants with recently diagnosed single-suture craniosynostosis and 253 frequency-matched control infants completed the Parenting Stress Index just prior to their infant's cranioplastic surgery. Family demographic information and mothers' ratings of the severity of their child's single-suture craniosynostosis were obtained. Results : Average Parent Domain scores for parents of infants with single-suture craniosynostosis differed little from those reported by parents of control infants; however, Child Domain scores among parents of infants with single-suture craniosynostosis were higher on some subscales, primarily related to unexpected infant health and appearance issues. In both groups, fathers reported higher Child Domain stress than mothers, and mothers reported higher Parent Domain stress than fathers. Case mothers reported greater stress if they perceived their child's condition as more noticeable to others. Conclusions : Prior to cases' cranioplastic surgery, parents of children with and without single-suture craniosynostosis reported similar levels of stress in relation to their parenting roles and the behavioral characteristics of their infants. Visibility of condition should be considered a risk for increased stress for mothers of infants with single-suture craniosynostosis. Stress differences between mothers and fathers were far more discernible than those associated with the presence or absence of single-suture craniosynostosis. PMID:20815729

Rosenberg, Janine M; Kapp-Simon, Kathleen A; Starr, Jacqueline R; Cradock, Mary Michaeleen; Speltz, Matthew L



Thin film absorber for a solar collector  


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.

Wilhelm, William G. (Cutchogue, NY)



Conformal metamaterial absorber for curved surface.  


In this paper, three different unit cells are designed on the basis split-ring-cross resonators, and each unit cell has an absorption rate greater than 90% at incident angles of 0°, 30°, and 45°, respectively. They are non-periodically placed in three different zones on the curved surface. Therefore, the proposed conformal metamaterial absorber can achieve a high absorption rate. The performance of the proposed absorber is compared with that of a metallic curved surface and a conformal metamaterial absorber with the same unit cells. PMID:24104326

Jang, Youngsoo; Yoo, Minyeong; Lim, Sungjoon



Temporary suspension of acute facial paralysis using the S-S Cable Suture (Medical U&A, Tokyo, Japan).  


For a treatment of facial paralysis, suture suspension of soft tissue is considered effective due to its less invasiveness and relatively simple technique, with minimal bruising and rapid recovery. However, suture suspension effect may not last for a long period of time. We obtained good outcome with temporary static suture suspension in 5 cases of severe facial paralysis in the intervening period between the onset of paralysis and expected spontaneous recovery. We used the S-S Cable Suture (Medical U&A, Tokyo, Japan), which was based on the modification of previously established method using the Gore-Tex cable suture originally reported by Sasaki et al in 2002. Because of the ease of technique and relatively strong lifting capability of the malar pad, we recommend it as a useful procedure for a patient suffering acute facial paralysis with possible spontaneous recovery for an improved quality of life by the quick elimination of facial distortion. PMID:18580152

Ozaki, Mine; Takushima, Akihiko; Momosawa, Akira; Kurita, Masakazu; Harii, Kiyonori



Retinoic Acid Enhances Osteogenesis in Cranial Suture-Derived Mesenchymal Cells: Potential Mechanisms of Retinoid-Induced Craniosynostosis  

PubMed Central

Background In utero retinoid exposure results in numerous craniofacial malformations, including craniosynostosis. Although many malformations associated with retinoic acid syndrome are associated with neural crest defects, the specific mechanisms of retinoid-induced craniosynostosis remain unclear. The authors used the culture of mouse cranial suture–derived mesenchymal cells to probe the potential cellular mechanisms of this teratogen to better elucidate mechanisms of retinoid-induced suture fusion. Methods Genes associated with retinoid signaling were assayed in fusing (posterofrontal) and patent (sagittal, coronal) sutures by quantitative real-time polymerase chain reaction. Cultures of mouse suture–derived mesenchymal cells from the posterofrontal suture were established from 4-day-old mice. Cells were cultured with all-trans retinoic acid (1 and 5 µM). Proliferation, osteogenic differentiation, and specific gene expression were assessed. Results Mouse sutures were found to express genes necessary for retinoic acid synthesis, binding, and signal transduction, demonstrated by quantitative realtime polymerase chain reaction (Raldh1, Raldh2, Raldh3, and Rbp4). These genes were not found to be differentially expressed in fusing as compared with patent cranial sutures in vivo. Addition of retinoic acid enhanced the osteogenic differentiation of suture-derived mesenchymal cells in vitro, including up-regulation of alkaline phosphatase activity and Runx2 expression. Contemporaneously, cellular proliferation was repressed, as shown by proliferative cell nuclear antigen expression. The pro-osteogenic effect of retinoic acid was accompanied by increased gene expression of several hedgehog and bone morphogenetic protein ligands. Conclusions Retinoic acid represses proliferation and enhances osteogenic differentiation of suture-derived mesenchymal cells. These in vitro data suggest that retinoid exposure may lead to premature cranial suture fusion by means of enhanced osteogenesis and hedgehog and bone morphogenetic protein signaling.

James, Aaron W.; Levi, Benjamin; Xu, Yue; Carre, Antoine L.; Longaker, Michael T.



Reconstruction of cranial bone defects using a quick-setting hydroxyapatite cement and absorbable plates.  


We examine the 6-month histology of a quick-setting hydroxyapatite cement (Mimix), with and without absorbable plates (LactoSorb), after placement in critical size defects made in the skull of 20 New Zealand white rabbits. Two 10-mm-diameter parietal defects were made in each rabbit. One defect was placed on each side of the sagittal suture. In 10 animals, the left defect was filled with Mimix alone, and in the other 10, an absorbable plate was placed across the base of the left defect before Mimix placement. The right-sided defect served as a control in all animals, with no material placed in or across this defect. The rabbits were killed 6 months postoperatively. A bone pathologist performed histologic examinations of the specimens looking specifically for evidence of inflammatory reaction and bone formation. There was no inflammation around the dura or any other negative histologic reaction in either the study groups or the control. Growth of new bone into the Mimix was found along the periphery in all specimens. We found no migration or displacement of the Mimix from any of the calvarial defects. PMID:18650747

Ascherman, Jeffrey A; Foo, Roy; Nanda, Dawne; Parisien, May



Radar Absorbing Materials: Mechanisms and Materials.  

National Technical Information Service (NTIS)

An introduction is given to the theoretical basis for the design of radar absorbing materials (RAM) with emphasis given on techniques for modifying material properties to give the desired performance. These techniques include additives in the form of scat...

K. Gaylor



FFTF absorber-pin performance verification test  

SciTech Connect

The FFTF (Fast Flux Test Facility) Absorber Pin Performance Verification Test - (HA006) is an irradiation test of neutron absorber pins with integral temperature and pressure monitoring instrumentation. The pins, containing boron carbide, are representative of the FFTF Row 3 Safety, Row 5 Control and Row 7 Fixed Shim Absorber Assemblies. In the 300 full power days (FPD) this test will reside in its 2610 Position in the reactor, it will generate test data that will be used to infer the effects of irradiation on the absorber assemblies it simulates. Design and fabrication of the test vehicle began in 1976 and the forty-foot test assembly was loaded in the FFTF on February 10, 1981. The test provided data in March 1981 during a series of natural circulation tests, and again in November 1981 during the eight-day full power run establishing base-line data.

Basmajian, J.A.; King, D.C.; Jackson, J.L.; Vogel, M.A.



Measurement of Tampon Absorbency; Test Method Evaluation.  

National Technical Information Service (NTIS)

The 'Syngyna' test, developed by the tampon industry to measure tampon absorbency has been evaluated in the FDA Center for Medical Device Analysis. In addition, two other tests were evaluated which were slight modifications of the 'Syngyna' test but which...

D. E. Marlowe R. M. Weigle R. S. Stauffenberg



Thermal Neutron Spect+a Near Absorbers.  

National Technical Information Service (NTIS)

The perturbation in a thermal neutron spectrum near an absorber immersed in a moderator has been studied using activation techniques. The results show two separate effects for pure thermal spectra, a 'transmission hardening' depending on the energy variat...

C. B. Bigham



Durability of Polymeric Glazing and Absorber Materials  

SciTech Connect

The Solar Heating and Lighting Program has set the goal of reducing the cost of solar water heating systems by at least 50%. An attractive approach to such large cost reduction is to replace glass and metal parts with less-expensive, lighter-weight, more-integrated polymeric components. The key challenge with polymers is to maintain performance and assure requisite durability for extended lifetimes. The objective of this task is to quantify lifetimes through measurement of the optical and mechanical stability of candidate polymeric glazing and absorber materials. Polycarbonate sheet glazings, as proposed by two industry partners, have been tested for resistance to UV radiation with three complementary methods. Incorporation of a specific 2-mil thick UV-absorbing screening layer results in glazing lifetimes of at least 15 years; improved screens promise even longer lifetimes. Proposed absorber materials were tested for creep and embrittlement under high temperature, and appear adequate for planned ICS absorbers.

Jorgensen, G.; Terwilliger, K.; Bingham, C.; Milbourne, M.



Introduction to Radar Absorbent Materials (RAM).  

National Technical Information Service (NTIS)

The purpose of this Introduction is to present, in a straightforward way, the electromagnetic principles of Radar Absorbent Materials (RAM) for the benefit of the non-electromagnetic-specialist who finds himself involved in this field. The fundamental the...

P. G. Lederer



Highly Absorbent Starch-Containing Polymeric Compositions.  

National Technical Information Service (NTIS)

The patent application concerns aqueous fluid-absorbing compositions comprising water-insoluble alkali salts of saponified gelatinized-starch-polyacrylonitrile graft polymers containing gelatinized starch (GS) and saponified polyacrylonitrile (HPAN). The ...

M. G. Weaver E. B. Bagley G. F. Fants W. M. Doane



21 CFR 872.6050 - Saliva absorber.  

Code of Federal Regulations, 2013 CFR

...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES DENTAL DEVICES Miscellaneous Devices § 872...absorb moisture from the oral cavity during dental procedures. (b)...



Geochemistry, provenance and stratigraphic age of metasedimentary rocks from the eastern Vardar suture zone, northern Greece  

Microsoft Academic Search

Uppermost Palaeozoic and Mesozoic sediments from the Vardar suture zone in northern Greece record a cycle of Neotethyan oceanic basin opening and closure and their analysis places tight constraints on the geotectonic evolution of the area. The oldest post-Carboniferous sedimentary unit in the study area is the Examili Formation, which comprises mainly metaarkoses and metaquartzites, and was deposited in an

Guido Meinhold; Dimitrios Kostopoulos; Thomas Reischmann; Dirk Frei; Marcelle K. BouDagher-Fadel



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

Microsoft Academic Search

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

Craig A. Cummins; George A. C. Murrell



Evaluation of sutures after immersion in nonalcoholic benzydamine hydrochloride mouthrinse by scanning electron microscopy.  


This study evaluated the surface integrity of sutures after immersion in mouthrinse or water, by scanning electron microscopy (SEM) analysis. Pieces of resorbable suture remaining after oral surgery were immediately collected. Twelve pieces each of catgut, chromed catgut, and polyglactin 910 were divided into four groups and immersed in pure mouthrinse, mouthrinse diluted in water at 1:1 and 1:2, or water (positive control), for 24 h. Three pieces each of new sutures were used as negative control. Specimens were placed on stubs and sputter coated with gold for SEM analysis. Observation of experimental groups and comparison with controls revealed that immersion in the mouthrinse at different dilutions did not alter their surface; slight, nonsignificant changes were found in some experimental specimens yet also in the positive control group. It was concluded that immersion of resorbable sutures in water or non-alcoholic benzydamine hydrochloride mouthrinse did not produce any significant change; therefore, this mouthrinse may be safely employed after oral surgery. PMID:17994255

da Silva Dalben, Gisele; Francischone, Leda Aparecida; Prieto-Oliveira, Paula; Consolaro, Alberto



Suture-related urolithiasis following repair of inadvertent prostatectomy in a dog  

PubMed Central

A 10-month-old male chow chow mixed breed dog was presented for anuria secondary to inadvertent prostatectomy performed during unilateral cryptorchidectomy. Surgical repair was successfully performed; however, this resulted in suture-associated urolith formation 3 months later, requiring a second surgical intervention and urethrostomy.

Puttick, Jennifer L.; Sereda, Colin W.



Stabilization of the Dislocated Acromioclavicular Joint with Ligament Suture and Balser Hook Plate  

Microsoft Academic Search

Objective Reduction of dislocation and reconstruction of acromioclavicular joint by suturing the torn capsuloligamentous structures, temporary fixation with a Balser plate. Goal: restitution of form and function of shoulder girdle. Indications Primary acromioclavicular dislocation of Tossy type III or Rockwood type III in physically active patients. Acromioclavicular dislocations with additional muscle injuries of Rockwood type IV-VI. Remote painful dislocations without

Ewa Klara Folwaczny; Klaus Michael Stürmer



Laparoscopic suture rectopexy without resection is effective treatment for full-thickness rectal prolapse  

Microsoft Academic Search

PURPOSE: The study was undertaken to evaluate the role of laparoscopic suture rectopexy without resection as a safe and effective treatment for full-thickness rectal prolapse. METHOD: Data were prospectively collected and analyzed on 25 patients who underwent laparoscopic rectopexy without resection for full-thickness rectal prolapse between October 1994 and July 1998. Four patients had conversions from laparoscopic to open surgery.

S. M. Heah; J. E. Hartley; J. Hurley; G. S. Duthie; J. R. T. Monson



A Mesozoic crustal suture on the Gondwana margin in the New Zealand region  

Microsoft Academic Search

Marine crustal multichannel seismic data, recorded offshore South Island, New Zealand, are used to provide constraints on the evolution of the Gondwana margin in this region. Lower crustal and upper mantle seismic reflectivity off southeastern Stewart Island, south of South Island, is interpreted in terms of a northeast dipping paleosubduction zone. This inferred suture is considered to be related to

F. J. Davey



Material Properties of Human Infant Skull and Suture at High Rates  

Microsoft Academic Search

Clinicians are often faced with the challenging task of distinguishing between accidental and in- flicted pediatric head trauma. There is currently a disparity in the anecdotal case study literature as to what kinds of injuries can occur in children from low height falls. There is also a paucity of material property data for pediatric skull and suture at rates similar

Brittany Coats; Susan S. Margulies



Search for a scientific basis for continuous suture closure: a 30-yr odyssey.  


Continuous percutaneous and dermal suture closures have an important role in the approximation of long, linear lacerations in the emergency department. This report documents the scientific basis for these continuous closure techniques. In addition, a detailed description of these surgical closure techniques is presented. PMID:9279703

Drake, D B; Gear, A J; Mazzarese, P M; Faulkner, B C; Woods, J A; Edlich, R F


Percutaneous retrieval of a central venous catheter sutured to the wall of the right atrium.  


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. PMID:9929552

Neuerburg, J M; Günther, R W; Chalabi, K; Hunter, D



Clinical Study of Single-Suture Inferior Retractor Repair for Involutional Entropion  

Microsoft Academic Search

Purpose: To evaluate the clinical efficacy of a simplified single-suture inferior retractor repair technique for involutional entropion. Methods: A retrospective study of 20 patients (26 eyelids), followed for 6 months at our hospital, who showed no severe horizontal lid laxity were operated on for involutional entropion. After subciliary incision, the inferior retractor was identified and repaired by reattaching the superior

Min Soo Park; Mi Jung Chi; Se Hyun Baek



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

Microsoft Academic Search

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

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



Effects of force magnitude on a sutural model: a quantitative approach  

SciTech Connect

In an effort to quantify the biologic effects of an orthodontic tensile force, the rat interpremaxillary suture was investigated as a model for the periodontal ligament and expanded in vivo with a helical spring across the maxillary incisors. Three levels of force were used: light (50 to 75 g), medium (150 to 175 g), and heavy (250 to 300 g). Thymidine labeling and histologic studies after 12 hours and 1, 2, and 4 days of force delivery are described (n = 48 rats), as are biochemical studies after 2 and 4 days including a 6-hour organ culture (n = 32). The percentage of labeled cells increased significantly in all force groups at 1 day, followed by a rapid decline at 2 days, to a value at 4 days not significantly different from the controls. Biochemical studies showed significant increases in proline incorporation and alkaline phosphatase activity after 2 days of heavy force application. Histologic examinations showed obvious tissue changes beginning by day 1 and involving increases in suture width, vascularity, size and number of cells, amount of osteoid production, and changes in suture morphology. The experimental system was convenient, inflammation-free, and appeared to be reliable as evidenced by characteristic, synchronous tissue and autoradiographic changes in all experimental sutures through 4 days.

Southard, K.A.; Forbes, D.P.



Virtual suturing simulation based on commodity physics engine for medical learning.  


Development of virtual-reality medical applications is usually a complicated and labour intensive task. This paper explores the feasibility of using commodity physics engine to develop a suturing simulator prototype for manual skills training in the fields of nursing and medicine, so as to enjoy the benefits of rapid development and hardware-accelerated computation. In the prototype, spring-connected boxes of finite dimension are used to simulate soft tissues, whereas needle and thread are modelled with chained segments. Spherical joints are used to simulate suture's flexibility and to facilitate thread cutting. An algorithm is developed to simulate needle insertion and thread advancement through the tissue. Two-handed manipulations and force feedback are enabled with two haptic devices. Experiments on the closure of a wound show that the prototype is able to simulate suturing procedures at interactive rates. The simulator is also used to study a curvature-adaptive suture modelling technique. Issues and limitations of the proposed approach and future development are discussed. PMID:21165761

Choi, Kup-Sze; Chan, Sze-Ho; Pang, Wai-Man



Holmium laser division of a suture causing entrapment of a drainage tube after laparoscopic nephrectomy.  


Inability to remove a drainage tube is an uncommon complication after laparoscopic nephrectomy. We describe removal of a drainage tube that was entrapped by an abdominal wall suture. The procedure was safely performed using an ureteroscope and a holmium laser. PMID:23417168

Luo, Guang Heng; Xia, Shu Jie; Sun, Zhao Lin



Transpressive suture and flower structure: the Tomar-Badajoz-Cordoba shear zone, SW Iberia  

NASA Astrophysics Data System (ADS)

The Tomar-Badajoz-Córdoba shear Zone (TBCSZ) is a major structural element located in SW-Iberia. This is considered a suture that separates the Central Iberian Zone (CIZ) in NE and Ossa Morena Zone (OMZ) in SW. It is at least 380km in length and 10 to 20km width. It is a left lateral transpressive flower structure. The strike-slip displacement decays from SE to NW. Its axial zone includes a high grade metamorphic rock unit known as the Central Unit (CU) containing eclogites, and also suture lithotypes as ophiolites. It has been interpreted as a Variscan suture or a reworked Cadomian suture in intraplate regime during the Variscan cycle. This important structure has been imaged by 2 deep seismic reflection transects, the IBERSEIS in 2003 and more recently by ALCUDIA. The good quality of the seismic data sets constrains the internal architecture of this transpressional zone imaging a crustal scale flower structure. The structure features a north dipping wedge limited by two bands of reflectors that reach the middle crust (5 s). Beneath that and slightly to the north a wedge of relatively high amplitude reflectivity dips to the south into the mantle for 10-15 km. This structure is most probably the seismic signature of a complex structure result of deformation associated to a strike slip fault.

Marti Linares, D.; Palomeras, I.; Perez-Estaun, A.; Carbonell, R.; Simancas, F.; Ayarza, P.; Tejero, R.; Martín-Parra, L.; Matas, J.; Lodeiro, F.; Mansilla, L.



Full Tendon Transposition Augmented with Posterior Intermuscular Suture and Recession - Resection Surgery  

PubMed Central

Purpose To report an effect of the full tendon transposition augmented with posterior intermuscular suture and recession-resection surgery, for the patient with monocular elevation deficiency (MED) and large exotropia. Methods Interventional case report. Full tendon transposition augmented with posterior intermuscular suture and recession-resection surgery was performed for a 26-year-old male patient had monocular elevation deficiency (MED) and large exotropia. Results Preoperative angle of deviation was 56 prism diopters (PD) hypotropia and 45 PD right exotropia, compared with 18 PD left hypertropia and 10 PD right esotropia postoperatively. Essotropia persisted after 2.5 years, however, and so the right medial rectus was recessed after removal of the previous posterior intermuscular suture. At a three-year follow-up after the second surgery, alignment was straight in the primary position at near and far distances. Conclusions Full tendon transposition augmented with posterior intermuscular suture and recession-resection surgery was effective for a patient with MED associated with significant horizontal deviation, and a second operation was easily performed when overcorrection occurred.

Hong, Samin; Chang, Yoon-Hee



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

Microsoft Academic Search

Objective: The relationship of the human premaxillary bone (Pmx) to neighboring craniofacial structures is clouded by its embryonic union with the maxillary bone proper. Only humans among all primates have such early fusion of the premaxillomaxillary suture (PS). This study surveyed the relationship of the PS to the upper deciduous dentition in nonhuman primates, and describes the distribution of bone

K. A. Carmody; M. P. Mooney; G. M. Cooper; C. J. Bonar; M. I. Siegel; E. R. Dumont; T. D. Smith




Microsoft Academic Search

The diagnosis and treatment of superior labrum (SLAP) tears have improved with the development of arthroscopic shoulder surgery techniques. With tears involving detachment of the biceps anchor, the goal is to restore stability to the labrum and biceps anchor and achieve healing to the glenoid. Suture repair with anchors is currently the repair technique of choice. The purpose of this



Interference Screw vs. Suture Anchor Fixation for Open Subpectoral Biceps Tenodesis: Does it Matter?  

PubMed Central

Background Bioabsorbable interference screw fixation has superior biomechanical properties compared to suture anchor fixation for biceps tenodesis. However, it is unknown whether fixation technique influences clinical results. Hypothesis We hypothesize that subpectoral interference screw fixation offers relevant clinical advantages over suture anchor fixation for biceps tenodesis. Study Design Case Series. Methods We performed a retrospective review of a consecutive series of 88 patients receiving open subpectoral biceps tenodesis with either interference screw fixation (34 patients) or suture anchor fixation (54 patients). Average follow up was 13 months. Outcomes included Visual Analogue Pain Scale (0–10), ASES score, modified Constant score, pain at the tenodesis site, failure of fixation, cosmesis, deformity (popeye) and complications. Results There were no failures of fixation in this study. All patients showed significant improvement between their preoperative and postoperative status with regard to pain, ASES score, and abbreviated modified Constant scores. When comparing IF screw versus anchor outcomes, there was no statistical significance difference for VAS (p = 0.4), ASES score (p = 0.2), and modified Constant score (P = 0.09). One patient (3%) treated with IF screw complained of persistent bicipital groove tenderness, versus four patients (7%) in the SA group (nonsignificant). Conclusion Subpectoral biceps tenodesis reliably relieves pain and improves function. There was no statistically significant difference in the outcomes studied between the two fixation techniques. Residual pain at the site of tenodesis may be an issue when suture anchors are used in the subpectoral location.

Millett, Peter J; Sanders, Brett; Gobezie, Reuben; Braun, Sepp; Warner, Jon JP



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

SciTech Connect

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.

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)



Paracrine Interaction between Adipose-Derived Stromal Cells and Cranial Suture-Derived Mesenchymal Cells  

PubMed Central

Introduction Adipose derived stromal cells (ASCs) are a potential cell source for the successful healing of skeletal defects. In this study we sought to investigate the potential for cranial suture-derived mesenchymal cells (SMCs) to promote the osteogenic differentiation of ASCs. Various reports have previously examined the unique in vitro attributes of SMCs; this study sought to extend those findings. Methods SMCs were isolated from wild-type mice (N=30) from both the fusing posterofrontal (PF) and patent sagittal (SAG) sutures. Cells were placed in transwell inserts with human ASCs (N=5 patients) with osteogenic differentiation medium with or without rNoggin (10-400 ng/ml). Specific gene expression of osteogenic markers and Hedgehog pathway were assayed; standard osteogenic assays (alkaline phosphatase and Alizarin red staining) were performed. All assays were performed in triplicate. Results Both PF and SAG SMCs induced osteogenic differentiation of ASCs (*p<0.05). PF SMCs induced ASC-osteogenesis to a greater degree than SAG SMCs (*p<0.05). This was accompanied by an increase in BMP expression (*p<0.05). Finally, rNoggin mitigated the pro-osteogenic effects of co-culture accompanied by a reduction in Hedgehog signaling (*p<0.05). Conclusions SMCs secrete paracrine factors that induce osteodifferentiation of multipotent stromal cells (hASCs). Cells derived from the fusing PF suture do this to a significantly greater degree than cells from the patent SAG suture. Enhanced BMP and Hedgehog signaling may underlie this paracrine effect.

James, Aaron W.; Levi, Benjamin; Commons, George W.; Glotzbach, Jason; Longaker, Michael T.



Parental estimation of early psychological development in children operated on for single suture synostosis.  


Impaired psychological development in children with single suture craniosynostosis is often described in the literature. The authors' own experience was that these children appeared to have normal psychological development during their first years of life. The aim of the present study was, therefore, to evaluate if parental estimation would reveal any shortcomings in psychological development. All consecutive patients operated on for non-syndromal single suture synostosis between October 2002 and June 2006 were included (n = 66). A questionnaire was filled out by the parents when the child was 3 years old. The questions concerned development of speech, motor control, personal abilities, and emotional development. The results were compared with randomly selected controls of the same age (n = 180) whose parents answered the same questionnaire. The results showed that children operated on for single suture synostosis did not show any signs of lasting disadvantages due to craniofacial surgery. The children did not in any respect suffer from a hampered psychological development up to 3 years of age. In summary the psychological development of patients operated on for single suture synostosis seems to be normal up to 3 years of age as far as parental estimation can reveal. PMID:22616804

Knudsen, Elisabet; Maltese, Giovanni; Tarnow, Peter; Tovetjärn, Robert; Kölby, Lars



Laparoscopic salpingotomy for tubal pregnancy: comparison of linear salpingotomy with and without suturing  

Microsoft Academic Search

BACKGROUND: The study was carried out to clarify the incidence of post-operative tubal adhesions, patency rate and pregnancy outcome after laparoscopic salpingotomy with and without suturing for tubal pregnancy. METHODS: From May 1996 to December 2002, a total of 97 cases of tubal pregnancy were treated in our centre by laparoscopic conservative surgery. The successful salpingotomy cases were randomly assigned

Akira Fujishita; Hideaki Masuzaki; Khaleque Newaz Khan; Michio Kitajima; Koichi Hiraki; Tadayuki Ishimaru


The Uterine Sandwich Method for Placenta Previa Accreta in Mullerian Anomaly: Combining the B-Lynch Compression Suture and an Intrauterine Gauze Tampon  

PubMed Central

Mullerian duct anomalies may cause obstetric complications, such as postpartum hemorrhage (PPH) and placental adhesion anomalies. Uterine compression suture may be useful for controlling PPH (especially atony). In recent studies, uterine compression sutures have been used in placenta accreta. We report a case of PPH, a placenta accreta accompanying a large septae, treated with B-Lynch suture and intrauterine gauze tampon.

Kaplanoglu, Mustafa



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

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

Richard J Mackool; Vivian R Monsanto



The uterine sandwich method for placenta previa accreta in mullerian anomaly: combining the B-lynch compression suture and an intrauterine gauze tampon.  


Mullerian duct anomalies may cause obstetric complications, such as postpartum hemorrhage (PPH) and placental adhesion anomalies. Uterine compression suture may be useful for controlling PPH (especially atony). In recent studies, uterine compression sutures have been used in placenta accreta. We report a case of PPH, a placenta accreta accompanying a large septae, treated with B-Lynch suture and intrauterine gauze tampon. PMID:23607012

Kaplano?lu, Mustafa



Porous absorber for solar air heaters  

SciTech Connect

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)

Finch, J.A.



Water-Absorbent Polymers: A Patent Survey  

Microsoft Academic Search

Water-absorbent polymers or hydrogels, sometimes defined as superabsorbent polymers (SAP) in the literature, are water-insoluble hydrophilic polymers, able to swell and absorb amounts of water, saline solutions, or physiological fluids as high as 10-1000 times their own weight. They consist of polyelectrolytes or other highly hydrophilic polymeric matrices, usually bearing crosslinking sites along the macromolecular chains in order to avoid

Riccardo Pó



Terahertz backscattering behavior of various absorbing materials  

NASA Astrophysics Data System (ADS)

The Submillimeter-Wave Technology Laboratory (STL) at the University of Massachusetts Lowell has investigated the electromagnetic scattering behavior of various broadband absorbers. Several absorbing materials were tested in a compact radar range operating at a center frequency of 160 GHz. The polarimetric radar cross section was measured at elevation angles from 15° to 75°. In addition to the backscattering behavior, the normal incidence transmittance of the materials was evaluated.

Wu, C.; Gatesman, A. J.; Deroeck, L.; Horgan, T.; Giles, R. H.; Nixon, W. E.



Estimating the radiation absorbed by a human  

Microsoft Academic Search

The complexities of the interactions between long- and short-wave radiation fluxes and the human body make it inherently difficult\\u000a to estimate precisely the total radiation absorbed (R) by a human in an outdoor environment. The purpose of this project was to assess and compare three methods to estimate the\\u000a radiation absorbed by a human in an outdoor environment, and to

Natasha A. Kenny; Jon S. Warland; Robert D. Brown; Terry G. Gillespie



Mesozoic ophiolites, sutures, and arge-scale tectonic movements in Afghanistan  

NASA Astrophysics Data System (ADS)

The tectonic history of Afghanistan appears to be the result of successive accretion of fragments of Gondwana to the active margin of Laurasia since the end of the Paleozoic. The margin, in Afghanistan, lies along the present Herat and Panjshir faults, south of Hindu Kush, swings around the central Pamirs and can presumably be traced along the present western Altyn Tagh and Kunlun faults in Tibet. North of this boundary, Paleozoic rocks have been deformed in the Upper Paleozoic, whereas south of it, there is no trace of the Hercynian orogeny. The first collision of Gondwanian fragments with Laurasia probably occurred in the early Mesozoic along the Hindu Kush and Kunlun. To the south, ophiolites along the Panjao and Pangong-Nu Chiang sutures (respectively in central Afghanistan and central Tibet) testify for another suturing event in the Upper Jurassic or Lower Cretaceous. The Indus-Tsangpo suture between India and Tibet corresponds, in eastern Afghanistan, to two ophiolite subbelts, near Kabul and Khost. Both ophiolite complexes have been emplaced between Maestrichtian and Lower Eocene by choking of two northward-dipping subduction zones. After complete contact between the Indian and Asian continents was achieved, presumably in the end of Eocene, the penetration of India into Asia caused large-scale intra-continental shortening. A large part of the shortening was accommodated by strike-slip faulting along Mesozoic and more ancient sutures. Central Afghanistan, in particular, was extruded to the west along the Herat suture by the protrusion of the Pamir wedge. It subsequently collided with the Lut block.

Tapponnier, Paul; Mattauer, Maurice; Proust, François; Cassaigneau, Christian



Organic Absorbents for Triple Point Absorption Freeze Crystallization Processes.  

National Technical Information Service (NTIS)

Calculations were made to predict the absorption characteristics of various classes of organic molecules. Pertinent absorption refrigeration characteristics were found to be water-absorbent composition, miscibility of the absorbent and absorbed water, and...

J. A. Heist



21 CFR 868.5300 - Carbon dioxide absorbent.  

Code of Federal Regulations, 2013 CFR

...2013-04-01 2013-04-01 false Carbon dioxide absorbent. 868.5300 Section...DEVICES Therapeutic Devices § 868.5300 Carbon dioxide absorbent. (a) Identification. A carbon dioxide absorbent is a device...



21 CFR 868.5310 - Carbon dioxide absorber.  

Code of Federal Regulations, 2013 CFR

...2013-04-01 2013-04-01 false Carbon dioxide absorber. 868.5310 Section...DEVICES Therapeutic Devices § 868.5310 Carbon dioxide absorber. (a) Identification. A carbon dioxide absorber is a device that is...



21 CFR 880.5300 - Medical absorbent fiber.  

Code of Federal Regulations, 2013 CFR

...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...



Modal properties and stability of centrifugal pendulum vibration absorber systems with equally spaced, identical absorbers  

NASA Astrophysics Data System (ADS)

This work develops an analytical model of centrifugal pendulum vibration absorber systems with equally spaced, identical absorbers and uses it to investigate the structure of the modal vibration properties. The planar model admits two translational and one rotational degrees-of-freedom for the rotor and a single arclength degree-of-freedom for each absorber. The gyroscopic effects from rotor rotation are taken into account. Examination of the associated eigenvalue problem reveals well-defined structure of the vibration modes resulting from the cyclic symmetry of the absorbers. The vibration modes are classified into rotational, translational, and absorber modes. Characteristics of each mode type are analytically proved. The effects of the absorber tuning order on the modes are derived. The critical speeds and flutter instability of the system are studied numerically and analytically.

Shi, Chengzhi; Parker, Robert G.



Absorption enhancement of fractal frequency selective surface absorbers by using microwave absorbing material based substrates  

Microsoft Academic Search

In this paper, the effect of microwave absorbing material-based (MAM) substrate on the absorption properties of fractal frequency selective surface (FSS) absorbers was investigated in detail. The fractal shapes were proposed to construct the schematic diagrams of the FSS unit cell. The absorption properties of the absorber samples containing different substrates, including FR-4dielectric substrate and MAM-based substrate, were exhibited via

Zhangqi Liao; Rongzhou Gong; Yan Nie; Tao Wang; Xian Wang



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

SciTech Connect

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.

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



The Benefits of Automated Suturing Devices in Gynecologic Endoscopic Surgeries: The Endo Stitch™and SILS™ Stitch.  


Traditional laparoscopic suturing and knot tying requires a steep learning curve and is often the rate-limiting step in performing advanced laparoscopic gynecologic surgical procedures. It is particularly challenging due to difficulties with tissue handling and needle control while performing the procedure on a two-dimensional screen, oftentimes at unfavorable suturing angles. Automated suturing devices have greatly simplified the process and allow less-experienced surgeons to safely and efficiently perform laparoscopic suturing and knot tying. The Endo Stitch™ (Covidien, Mansfield, MA) is a 10-mm singleuse suturing device that allows placement of multiple suture types during laparoscopic surgery, and simplifies the process of laparoscopic knot tying. The SILS™ Stitch (Covidien, Mansfield, MA) is based on the same technology as the Endo Stitch with the added advantage of articulation up to 75° and rotation up to 360°. This enables surgeons to operate in tight spaces during advanced laparoscopic procedures, and to reach tissues in their natural anatomical position rather than pulling or manipulating tissue into the suturing device. Newer technologies in laparoscopic surgery, such as the Endo Stitch and SILS Stitch, may allow gynecologic surgeons to expand their surgical repertoire of advanced laparoscopic procedures. PMID:23225593

Hart, Stuart



Method of absorbance correction in a spectroscopic heating value sensor  


A method and apparatus for absorbance correction in a spectroscopic heating value sensor in which a reference light intensity measurement is made on a non-absorbing reference fluid, a light intensity measurement is made on a sample fluid, and a measured light absorbance of the sample fluid is determined. A corrective light intensity measurement at a non-absorbing wavelength of the sample fluid is made on the sample fluid from which an absorbance correction factor is determined. The absorbance correction factor is then applied to the measured light absorbance of the sample fluid to arrive at a true or accurate absorbance for the sample fluid.

Saveliev, Alexei; Jangale, Vilas Vyankatrao; Zelepouga, Sergeui; Pratapas, John



Absorbing Information about a Child's Incurable Cancer  

PubMed Central

Purpose To assess parents’ ability to absorb information that their child's cancer was incurable and to identify factors associated with parents’ ability to absorb this information. Patients and Methods: An anonymous mail-in questionnaire study was performed as a population-based investigation in Sweden between August and October of 2001. 449 parents who lost a child to cancer 4–9 years earlier (response rate 80%) completed the survey. 191 (43%) of the bereaved parents were fathers and 251 (56%) were mothers. Results Sixty percent of parents (n = 258) reported that they were able to absorb the information that their child's illness was incurable. Parents were better able to absorb this information when the information was given in an appropriate manner (RR 1.6; CI 1.3–2.0), when they shared their problems with others during the child's illness course (RR 1.4; CI 1.1–1.8) and when they had no history of depression (RR 1.3; CI 1.0–1.8). Parents who reported that they were able to absorb the information were more likely to have expressed their farewells to the child in their desired manner (RR 1.3; CI 1.0–1.5). Conclusions Parents who received information that their child's illness was incurable in an appropriate manner are more likely to absorb that information. Whether or not parents are able to absorb the information that their child's cancer is incurable has implications in terms of preparation for the child's impending death.

Lannen, Patrizia; Wolfe, Joanne; Mack, Jennifer; Onelov, Erik; Nyberg, Ullakarin; Kreicbergs, Ulrika



Gas absorber and refrigeration system using same  

SciTech Connect

A refrigeration system is described comprising: (a) a separator for separating a refrigerant gas from a refrigerant-rich solution to produce a refrigerant-lean solution; (b) a condenser for emitting heat to thereby condense the refrigerant gas received from the separator and an evaporator for absorbing heat to thereby evaporate the condensed refrigerant gas; (c) an absorber assembly including: a precooler for precooling the refrigerant-lean solution received from the separator; a mixer for mixing the refrigerant gas from the evaporator with the precooled refrigerant-lean solution received form the precooler to thereby form a gas-solution mixture, the mixer having nozzles for allowing the refrigerant-lean solution to be injected there through into a flow of the gas-solution mixture, the nozzles being adapted to cause the refrigerant-lean solution to experience a predetermined pressure drop there across; and absorbent tubes for allowing the gas-solution mixture to flow there through while causing the refrigerant-lean solution to absorb the refrigerant gas to thereby generate a refrigerant-rich solution; (d) a solution receiver for receiving the refrigerant-rich solution through the absorber tubes and a manifold for containing an overflow through the absorber tubes during a normal operation of the refrigeration system, an upper part of the solution receiver serving to contain the refrigerant gas; (e) recycling means for controllably recycling the refrigerant gas from the solution receiver into the absorber assembly; and a solution pump for delivering the refrigerant-rich solution from the solution receiver to the separator through a generator for heating the refrigerant-rich solution.

Dehne, H.



Acquired Umbilico-Inguinal Fistula with Persistent Discharge due to Suture Reaction: A Case Report and Review of the Literature  

PubMed Central

The aim of this paper is to stay a very rare umbilico-inguinal fistula (UIF) resulting from a delayed suture reaction after the use of silk suture to repair an inguinal hernia. A 3-year-old boy presented with persistent umbilical discharge. The initial diagnosis was omphalitis and he was treated with broad-spectrum antibiotics but a UIF was subsequently diagnosed. Surgery was performed to ascertain the cause of the UIF. This case demonstrates that silk suture used in inguinal hernia repair can lead to a UIF, which should be considered in the differential diagnosis of a patient presenting with persistent umbilical discharge.

Cevik, Muazez



ANL Advanced Photon Source crotch absorber design  

SciTech Connect

The ANL 7-GeV Advanced Photon Source storage ring crotch absorber will be subjected to a very high photon loading power density, approximately 750 W/mm{sup 2} at normal incidence. To accommodate this high heat load, two designs were studied: one is a V-type compound angle absorber and the other is a horizontally rotated plate absorber. For both models, thermal and structural analyses have been carried out using 3-D finite element analysis. The analysis indicates that the V-type compound angle absorber controlled the peak temperatures effectively within the given geometric constraints. Test samples made of GlidCop Al 15 (alumina dispersion strengthened copper) were evaluated with an electron beam welder. The predicted and measured temperatures were in reasonable agreement. The overall absorber design includes a perforated screen in the positron beam area of the storage ring vacuum chamber to reduce rf impedance and to provide pumping access for the high local gas load. 3 refs., 4 figs., 2 tabs.

Choi, M. (Seoul National Univ. (Republic of Korea)); Gonczy, J.D.; Howell, J.W.; Niemann, R.C. (Argonne National Lab., IL (USA))



Tensile fixation strengths of absorbable meniscal repair devices as a function of hydrolysis time. An in vitro experimental study.  


To determine the effect of hydrolysis time on the fixation strength of absorbable meniscal repair devices, adult bovine menisci were repaired with five devices and a suture. The ultimate tensile strength of the repair was then tested in six specimens immediately or after 6, 12, or 24 weeks of incubation at 37 degrees C in a saline solution containing antibiotics, antimycotics, and protease inhibitors. Immediately after implantation the Bionx Meniscus Arrow had a significantly higher failure strength (57.7 +/- 13.8 N) than the Linvatec BioStinger (35.1 +/- 6.7 N), the Innovasive Clearfix screw (34.9 +/- 13 N), the Surgical Dynamics S-D-sorb staple (9.4 +/- 4.6 N), and the Mitek Meniscal Repair System (polydioxanone) (27.2 +/- 6.0 N). However, there was no significant difference between the Bionx Meniscus Arrow and a 2-0 polydioxanone vertical suture (51.6 +/- 2.7 N). The polydioxanone-based implants demonstrated a significant decrease in failure strength at 12 and 24 weeks. Similarly, the Surgical Dynamics S-D-sorb staple lost all fixation strength by 24 weeks. The remaining devices showed no significant loss of failure strength over the 24-week period, suggesting that 24 weeks of hydrolysis does not adversely affect the ultimate holding power of poly L-lactide-based meniscal fixation devices. PMID:11292034

Arnoczky, S P; Lavagnino, M


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


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

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



Non-Absorbable Gas Behavior in the Absorber/Evaporator of a Absorption Chiller  

NASA Astrophysics Data System (ADS)

A two-dimensional numerical study on non-absorbable gas behavior in the absorber/evaporator of an absorption chiller has been performed. In the present study, the effect of the pitch-to-diameter ratio of a cylinder bundle in the absorber was highlighted. From the results, a sudden decrease of the overall heat transfer coefficient of the absorber was observed at a certain mean concentration of non-absorbable gas for each pitch-to-diameter ratio. Such a critical concentration was also found to decrease as the pitch-to- diameter ratio increased. The sudden decrease occurs due to the sudden disappearance of recirculating region, which is formed between the absorber and the evaporator, and where most of non-absorbable gas stays when it exists. As the pitch-to-diameter ratio increases, the recirculating region becomes weak because the velocity of the high velocity region supporting the recirculating flow decreases. Then, the critical mean concentration of non-absorbable gas is found to decrease as pitch-to-ratio increases.

Suzuki, Hiroshi; Nagamoto, Wataru; Sugiyama, Takahide


Design, simulation, and measurement of metamaterial absorber  

NASA Astrophysics Data System (ADS)

We present a design for metamaterial absorber which is resonant with strong absorbance in the microwave frequency range. Our fabricated design consists of two resonators and a metal wire that couple separately so as to absorb all incident electric and magnetic fields within a single planar layer which is only 0.9 mm thick. Experiments demonstrate that the transmission coefficients (S21) are lower than -10 dB across the entire measurement frequency range and the reflectance coefficients (S11) are about -20 dB around 10.4 GHz. The absorptivity which can be obtained through S parameters is greater than 98% around 10.4 GHz in experiments and 99.9% in simulations.

Cheng, Yongzhi; Yang, Helin



Distributed electric absorbers of beam vibrations  

NASA Astrophysics Data System (ADS)

Several electric vibration absorbers based on distributed piezoelectric control of beam vibrations are studied. The damping devices are conceived by interconnecting with different modular electric networks an array of piezoelectric transducers uniformly distributed on a beam. Five different vibration absorbers made of five different network interconnecting topologies are considered and their damping performances are analyzed and compared. The analysis is based on homogenized models of modular piezo-electromechanical systems. The optimal parameters of these absorbers are found by adopting the criterion of critical damping of waves with a single wave number. We show that: i) there is an interconnecting network providing an optimal multimodal damping; ii) the performances required to the electr(on)ic components can be significantly decreased by increasing the number (and decreasing the dimensions) of the piezoelectric transducers.

dell'lsola, Francesco; Del Vescovo, Dionisio; Maurini, Corrado



Absorber Materials at Room and Cryogenic Temperatures  

SciTech Connect

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.

F. Marhauser, T.S. Elliott, A.T. Wu, E.P. Chojnacki, E. Savrun



Ferrite HOM Absorber for the RHIC ERL  

SciTech Connect

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.

Hahn,H.; Choi, E.M.; Hammons, L.



Wavelength-tunable microbolometers with metamaterial absorbers.  


Microbolometers are modified by metallic resonant absorber elements, leading to an enhanced responsivity at selectable wavelengths. The dissipative energy absorption of tailored metamaterials allows for engineering the response of conventional bolometer microbridges. The absorption peak position and height are determined by the geometry of the metamaterial. Square-shaped metal/dielectric/metal stacks as absorber elements show spectral resonances at wavelengths between 4.8 and 7.0 microm in accordance with numerical simulations. Total peak absorptions of 0.8 are obtained. The metamaterial modified bolometers are suitable for multispectral thermal imaging systems in the mid-IR and terahertz regime. PMID:19794799

Maier, Thomas; Brückl, Hubert



Optical axes in various absorbing crystals  

NASA Astrophysics Data System (ADS)

Analytical expressions have been derived for the components of the complex permittivity tensor as a function of the number of optical axes existing in an absorbing monoclinic crystal. Some specific features of the orientation of these axes are considered. The ellipticities of natural waves are calculated for these crystals, as well as the ellipticities of transmitted light for right- or left-hand circularly polarized waves normally incident on a crystal. A significant difference of particular cases of absorbing monoclinic crystals from the general case of crystal with four circular axes is demonstrated.

Golovina, T. G.; Konstantinova, A. F.; Evdishchenko, E. A.; Nabatov, B. V.; Konstantinov, K. K.



Absorbing phase transition in energy exchange models  

NASA Astrophysics Data System (ADS)

We study energy exchange models with dissipation (?) and noise (of amplitude ?) and show that in presence of a threshold these models undergo an absorbing phase transition when either dissipation or noise strength or both are varied. Using Monte Carlo simulations we find that the behaviour along the critical line, which separates the active phase from the absorbing one, belongs to directed percolation (DP) universality class. We claim that the conserved version with ? = 1 and ? = 0 also shows a DP transi