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1

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. PMID:23362386

Kyrillos,, Ralph; Harissi-Dagher, Mona

2011-01-01

2

Mechanical testing of absorbable suture anchors  

Microsoft Academic Search

Purpose: Absorbable suture anchors offer great advantages but are made of mechanically weak material. The weakest link in the fixation of soft tissue to bone may therefore be the anchor itself. In this study, several commercially available anchors were mechanically tested in vitro. Type of study: Biomechanical bench study. Methods: Twelve absorbable suture anchor models were implanted into an artificial

Dominik C. Meyer; Sandro F. Fucentese; Kurt Ruffieux; Hilaire A. C. Jacob; Christian Gerber

2003-01-01

3

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

PubMed Central

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

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

2014-01-01

4

21 CFR 878.4830 - Absorbable surgical gut suture.  

Code of Federal Regulations, 2012 CFR

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

2012-04-01

5

21 CFR 878.4830 - Absorbable surgical gut suture.  

Code of Federal Regulations, 2011 CFR

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

2011-04-01

6

21 CFR 878.4830 - Absorbable surgical gut suture.  

Code of Federal Regulations, 2013 CFR

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

2013-04-01

7

21 CFR 878.4830 - Absorbable surgical gut suture.  

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

2014-04-01

8

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

PubMed Central

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

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

2009-01-01

9

Do absorbable mesh sutures cause less chronic pain than nonabsorbable sutures after Lichtenstein inguinal herniorraphy?  

PubMed

Chronic inguinal pain occurs in 20-30% of patients after hernia surgery. A prospective randomized study of 162 patients was undertaken to determine whether absorbable sutures cause less pain than continuous polypropylene fixation of the mesh in the Lichtenstein operation. All patients were operated on under local anesthesia by the same senior surgeon. One-half of the meshes were fixed with continuous 2-0 Dexon II sutures and one-half with continuous 2-0 Prolene sutures. The incidence of pain and recurrence was investigated after a mean follow-up of 2 years. Patient characteristics and operative outcome were similar in the two groups and statistically nonsignificant in both. The rate of significant wound hematomas (n = 3), infections (n = 1), and recurrences (n = 2) were low and not related to the type of sutures. In both study groups 24-26% of the patients felt some pain in follow-up, but over 90% were very satisfied with the operation. The absorbable suture material does not appear to cause less neuropathic pain after Lichtenstein operation than nonabsorbable sutures. PMID:12090577

Paajanen, Hannu

2002-03-01

10

No-mesh Inguinal Hernia Repair with Continuous Absorbable Sutures: A Dream or Reality? (A Study of 229 Patients)  

PubMed Central

Background/Aim The author has published results from two series based on his new technique of inguinal hernia repair. Interrupted sutures with a nonabsorbable material were used for repairs in both theses series. The author now describes the results of repairs done with continuous absorbable sutures. Materials and Methods This is a prospective study of 229 patients having 256 hernias operated from December 2003 to December 2006. An undetached strip of the external oblique aponeurosis was sutured between the inguinal ligament and the muscle arch to form the new posterior wall. Continuous sutures were taken with absorbable suture material (Monofilament Polydioxanone Violet). Data of hospital stay, complications, ambulation, recurrences, and pain were recorded. Follow-up was done until June 2007. Results A total of 224 (97.8%) patients were ambulatory within 6-8 h (mean: 6.42 h) and they attained free ambulation within 18-24 h (mean: 19.26 h). A total of 222 (96.4%) patients returned to work within 6-14 days (mean: 8.62 days) and 209 (91.26%) patients had one-night stays in the hospital. A total of 216 (94.3%) patients had mild pain for 2 days. There were four minor complications, but no recurrence or incidence of chronic groin pain. Patients were followed up for a mean period of 24.28 months (range: 6-42 months). Conclusions The results of this study correlate well with the author's previous publications. Continuous suturing saves operative time and one packet of suture material. The dream of every surgeon to give recurrence-free inguinal hernia repair without leaving any foreign body inside the patient may well become a reality in future. PMID:19568520

Desarda, Mohan P.

2008-01-01

11

A comparison of absorbable and non-absorbable 10-0 sutures for the repair of a divided rat facial nerve.  

PubMed

The use of absorbable sutures to anastomose nerves is controversial. This paper reports on a controlled trial comparing absorbable and non-absorbable sutures for this purpose. No difference between the sutures was found. PMID:8174304

Murray, J A; Willins, M; Mountain, R E

1994-02-01

12

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

Microsoft Academic Search

This study assessed performance of seven suture types in subyearling Chinook salmon Oncorhynchus tshawytscha implanted with acoustic microtransmitters and held at two water temperatures (12°C and 17°C). Nonabsorbable (Ethilon) and absorbable (Monocryl) monofilament sutures and nonabsorbable (Nurolon and silk) and absorbable (Vicryl, Vicryl Plus, and Vicryl Rapide) braided sutures were used to close incisions in Chinook salmon. When differences existed

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

2010-01-01

13

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

PubMed

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

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

2014-01-01

14

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

Code of Federal Regulations, 2011 CFR

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

2011-04-01

15

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

Code of Federal Regulations, 2013 CFR

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

2013-04-01

16

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

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

2014-04-01

17

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

Code of Federal Regulations, 2012 CFR

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

2012-04-01

18

Absorbable Versus Silk Sutures for Surgical Treatment of Trachomatous Trichiasis in Ethiopia: A Randomised Controlled Trial  

PubMed Central

Background Trachoma causes blindness through an anatomical abnormality called trichiasis (lashes touching the eye). Trichiasis can recur after corrective surgery. We tested the hypothesis that using absorbable sutures instead of silk sutures might reduce the risk of recurrent disease among patients with major trichiasis in a randomised trial. Methods and Findings 1,300 individuals with major trichiasis from rural villages in the Amhara Region of Ethiopia were recruited and assigned (1?1) by computer-generated randomisation sequence to receive trichiasis surgery using either an absorbable suture (polyglactin-910) or silk sutures (removed at 7–10 days) in an otherwise identical surgical technique. Participants were examined every 6 months for 2 years by clinicians masked to allocation. The primary outcome measure was recurrent trichiasis (?one lash touching the eye) at 1 year. There was no difference in prevalence of recurrent trichiasis at 1 year (114 [18.2%] in the absorbable suture group versus 120 [19.7%] in the silk suture group; odds ratio?=?0.90, 95% CI 0.68–1.20). The two groups also did not differ in terms of corneal opacification, visual acuity, conjunctival inflammation, and surgical complications. Conclusions There was no evidence that use of absorbable polyglactin-910 sutures was associated with a lower prevalence of trichiasis recurrence at 1 year postsurgery than silk sutures. However, from a programmatic perspective, polyglactin-910 offers the major advantage that patients do not have to be seen soon after surgery for suture removal. The postoperative review after surgery using absorbable polyglactin-910 sutures can be delayed for 3–6 months, which might allow us to better determine whether a patient needs additional surgery. Trial registration ClinicalTrials.gov NCT00522860 Please see later in the article for the Editors' Summary PMID:22180732

Rajak, Saul N.; Habtamu, Esmael; Weiss, Helen A.; Kello, Amir Bedri; Gebre, Teshome; Genet, Asrat; Bailey, Robin L.; Mabey, David C. W.; Khaw, Peng T.; Gilbert, Clare E.; Emerson, Paul M.; Burton, Matthew J.

2011-01-01

19

21 CFR 878.4840 - Absorbable polydioxanone surgical suture.  

Code of Federal Regulations, 2013 CFR

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

2013-04-01

20

21 CFR 878.4840 - Absorbable polydioxanone surgical suture.  

Code of Federal Regulations, 2012 CFR

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

2012-04-01

21

21 CFR 878.4840 - Absorbable polydioxanone surgical suture.  

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

2014-04-01

22

21 CFR 878.4840 - Absorbable polydioxanone surgical suture.  

Code of Federal Regulations, 2011 CFR

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

2011-04-01

23

An Evaluation of Suture Materials Used in Tendon Surgery  

Microsoft Academic Search

The following suture materials have been evaluated for their suitability for use in flexor tendon repairs: 4\\/0 gauge monofilament and multifilament stainless steel, mono-filament nylon, monofilament polypropylene, monofilament polybutestor, braided polyester, braided polyglycolic acid and a monofilament polyglyconate. These were investigated for their tensile strength (both knotted and unknotted), their extension to failure and knot-holding properties. Stainless steel and monofilament

I. A. TRAIL; E. S. POWELL; J. NOBLE

1989-01-01

24

Male circumcision performed with 8-figure non-absorbable suture technique  

PubMed Central

Introduction: We analyze the outcome of circumcisions performed with 8-figure non-absorbable suture (8FNS) and assess the feasibility of using the technique in male circumcision. Methods: We randomly divided 317 patients who would undergo circumcision between February 2009 and January 2012 into 2 groups. Each group was subdivided into children (age range: 7 to 15 years) and adult (range: 16 to 85 years). In the experiment group (n =166), we used 8FNS and in control group (n = 151), commonly absorbable suture (CAS) were used for the circumcised wound closure. The results of 2 groups were compared. We also performed a cost analysis and a mean 6-month follow-up (range: 1–12). Chi-square and Student’s t-test were used in statistical analysis. Differences were considered significant (p < 0.05). Results: No patients were required to remove their sutures postoperatively. Among them, the sutures of the 8FNS for circumcision fell off spontaneously within 9 days (6.2 ± 1.57). There was no statistically significant difference between the 2 groups in surgical duration (16.2 ± 1.73 vs. 15.8 ± 2.01) and follow-up time (6.4 ± 3.82 vs. 6.2 ± 2.39). The overall complication rate of the 2 groups was 6.63% and 10.53% (p = 0.15), respectively. In addition, the complication rate among the adults was significantly lower in the 8FNS group compared to children (2.53% vs. 10.34%, p = 0.04). Also, the average cost (in US dollars) of 8FNS for circumcision was $20.7 ± $3.83 less than $35.8 ± $5.02 of CAS, which is a very significant difference (p < 0.0001). Conclusions: 8FNS for circumcision is feasible, easy, safe and cost-effective, especially for adult males. PMID:24678353

Xi, Ren Chong; Sheng, Yin Rui; Chen, Wang Hong; Sheng, Li; Gang, Ji Jing; Tong, Zhou; Shan, Zhang; Shuo, Yang Feng; Gang, Zhang Zhi; Sheng, Yu Guo; Ling, Xu Jun; Ying, Guo Hong; Dong, Liu Chun; Ju, Zhu Kun

2014-01-01

25

Rectus Diastasis Corrected with Absorbable Suture: A Long-Term Evaluation  

Microsoft Academic Search

Background  Correction of rectus diastasis (RD) is performed during most abdominoplasties. This study aimed to evaluate the long-term\\u000a result of RD correction when the plication of the anterior rectus sheath is performed with an absorbable suture.\\u000a \\u000a \\u000a \\u000a \\u000a Methods  Abdominoplasty was performed for 12 women who presented with Nahas’ type A musculoaponeurotic deformity. The RD was measured\\u000a preoperatively with two computed tomography (CT) scan

Fabio Xerfan Nahas; Lydia Masako Ferreira; Pedro Bins Ely; Charles Ghelfond

2011-01-01

26

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

Code of Federal Regulations, 2012 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...

2012-04-01

27

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

Code of Federal Regulations, 2011 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...

2011-04-01

28

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...

2013-04-01

29

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

...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...

2014-04-01

30

Effect of gamma irradiation on the enzymatic degradation of polyglycolic acid absorbable sutures  

SciTech Connect

The effect of gamma irradiation on the enzymatic as well as the in vivo degradation of polyglycolic acid sutures was examined. The sutures of size 2-0 were irradiated at dosage levels of 0-20 mrad. The three enzymes chosen for this study were esterase, alpha-chymotrypsin, and trypsin. The irradiated sutures were both immersed in the enzyme solutions; their corresponding buffer controls, and implanted in inbred black-and-white hooded hister rats (Liverpool strain). The degradation of PGA sutures was determined mechanically. Among the three enzymes studied, esterase showed the highest enzymatic effect on the degradation of the unirradiated and irradiated PGA sutures. Trypsin's effect on PGA sutures was not observed until 20 mrad. The findings of trypsin demonstrated the hypothesis that synthetic high molecular weight polymers, which are initially resistant to enzymatic degradation, could become prone to enzymatic attack after altering their physical and chemical structures. Implanted PGA sutures maintained a similar or slightly higher mean tensile breaking strength in in vivo degradation compared to in vitro degradation (0.1M tris buffer of pH . 7.5); these degradation profiles suggest that PGA does not display similar behavior in in vivo and in vitro degradations. The magnitude of dissimilarity depends on the radiation dosage and on the duration of degradation, and is speculated to be attributable to the specific action of enzymes with respect to the configuration and chemical structure of the PGA sutures.

Chu, C.C.; Williams, D.F.

1983-11-01

31

Comparison of piezoresistive monofilament polymer sensors.  

PubMed

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

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

2014-01-01

32

Relationship of the diameter and tensile strength of nylon sutures to the USP specification and the effect of preconditioning.  

PubMed

Nylon monofilament sutures were tested in a straight pull as well as a conventional knot pull tensile test. In each test, sutures were evaluated following storage under prevailing atmospheric conditions or saturation in whole human blood. Blood saturation decreased the ultimate tensile strength by as much as 20%. The present investigation of sutures that were stored under prevailing atmospheric conditions substantiated the proposal previously made for polypropylene monofilaments--that 60% of the ultimate tensile strength could be established as a fundamental USP criterion for Class I monofilament sutures. PMID:10148999

Whitley, J Q; Prewitt, M J; Kusy, R P

1990-01-01

33

Acrylic polymer-grafted polypropylene sutures for covalent immobilization or reversible adsorption of vancomycin.  

PubMed

Glycidyl methacrylate (GMA) and acrylic acid (AAc) were separately grafted onto polypropylene (PP) monofilament sutures by means of pre-irradiation using a (60)Co ?-source, with the purpose of loading vancomycin via (i) covalent immobilization through the glycidyl groups of GMA and (ii) ionic interaction with AAc moieties. The effect of absorbed radiation dose, monomer concentration, temperature and reaction time on the grafting degree was evaluated in detail. GMA grafting ranged from 25% to 800% while the grafting yield of AAc onto PP could be tuned between 9% and 454%, at doses from 5 to 50 kGy and a dose rate 13.7 kGy/h. Grafting of GMA or AAc decreased the decomposition temperature and made the sutures swellable to a certain extent. GMA grafting led to a continuous, smooth and thick coating, which was suitable for immobilization of up to 1.9 ?g vancomycin per gram. The immobilized vancomycin enabled a reduction in the Staphylococcus aureus CFU adhered to the suture surface. On the other hand, dried AAc-functionalized sutures exhibited a rough and cracked surface which was responsible for a minor increase in the coefficient of friction. PP-g-AAc sutures exhibited pH-dependent swelling and remarkably high capability to host vancomycin (up to 109.9 mg/g), particularly those with an intermediate degree of grafting. Some AAc-functionalized sutures were shown able to inhibit bacterial growth after successive challenges with fresh lawns. Therefore, tuning the yield of grafting of GMA or AAc may enable the preparation of drug-suture combination products that retain or release, respectively, antimicrobial agents. PMID:24333904

García-Vargas, M; González-Chomón, C; Magariños, B; Concheiro, A; Alvarez-Lorenzo, C; Bucio, E

2014-01-30

34

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

NASA Technical Reports Server (NTRS)

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

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

1974-01-01

35

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

SciTech Connect

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

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

2013-10-01

36

Cranial sutures  

MedlinePLUS

... are needed for the infant's brain growth and development. During childbirth, the flexibility of the sutures allows the bones to overlap so the baby's head can pass through the birth canal without pressing ...

37

Aqua splint suture technique in isolated zygomatic arch fractures.  

PubMed

Various methods have been used to treat zygomatic arch fractures, but no optimal modality exists for reducing these fractures and supporting the depressed bone fragments without causing esthetic problems and discomfort for life. We developed a novel aqua splint and suture technique for stabilizing isolated zygomatic arch fractures. The objective of this study is to evaluate the effect of novel aqua splint and suture technique in isolated zygomatic arch fractures. Patients with isolated zygomatic arch fractures were treated by a single surgeon in a single center from January 2000 through December 2012. Classic Gillies approach without external fixation was performed from January 2000 to December 2003, while the novel technique has been performed since 2004. 67 consecutive patients were included (Classic method, n = 32 and Novel method, n = 35). An informed consent was obtained from all patients. The novel aqua splint and suture technique was performed by the following fashion: first, we evaluated intraoperatively the bony alignment by ultrasonography and then, reduced the depressed fracture surgically using the Gillies approach. Thereafter, to stabilize the fracture and obtain the smooth facial figure, we made an aqua splint that fit the facial contour and placed monofilament nonabsorbable sutures around the fractured zygomatic arch. The novel aqua splint and suture technique showed significantly correlated with better cosmetic and functional results. In conclusion, the aqua splint suture technique is very simple, quick, safe, and effective for stabilizing repositioned zygomatic arch fractures. The aqua splint suture technique can be a good alternative procedure in isolated zygomatic arch fractures. PMID:23793598

Kim, Dong-Kyu; Kim, Seung Kyun; Lee, Jun Ho; Park, Chan Hum

2014-04-01

38

Bacterial colonization on different suture materials--a potential risk for intraoral dentoalveolar surgery.  

PubMed

In this in vivo and in vitro study on resorbable (Monocryl and nonresorbable (Deknalon) monofilament sutures used in intraoral dentoalveolar surgery the bacterial colonization was compared. For the in vivo study the sutures were applied in 11 patients during dental surgery. Eight days postoperative the sutures were removed and the adhered bacteria were isolated and identified by biochemistry, morphology, antibiotic susceptibility, and gas chromatography. The colonization was studied by scanning electron microscopy. Aerobic and anaerobic bacteria were isolated in nearly equal colony-forming units (cfu) on each suture. In comparison with Monocryl about 15% more aerobic and anaerobic strains were isolated on Deknalon. Regarding the pathogens only, about three times more anaerobic strains were isolated on both sutures in total. Additionally, more pathogens were found on Deknalon than on Monocryl (aerobic >40%, anaerobic >25%). The variety of bacteria correspond with purulent infections, not with normal oral flora. Intraindividual comparisons of cfu showed differences in dependence of the patient as described for subgingivale plaques. For the in vitro study the sutures were incubated with Streptococcus intermedius and Prevotella intermedia for 0.5 h. Scanning electron microscopy was performed to examine qualitatively the level of bacterial adherence. After 0.5 h the bacteria adhered very well. The colonization rate of Streptococcus intermedius on both sutures was similar. Coccoid bacteria within biofilms were seen. The growth of Prevotella intermedia was much better on Deknalon than on Monocryl. The risk of bacteremia at the time of suture removal is discussed. PMID:15889436

Otten, J-E; Wiedmann-Al-Ahmad, M; Jahnke, H; Pelz, K

2005-07-01

39

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. PMID:20122319

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

2010-01-01

40

Hypersensitivity to Suture Anchors  

PubMed Central

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

2013-01-01

41

Fatigue testing of suture anchors.  

PubMed

In a porcine tibia model, we subjected widely used anchor-suture combinations to a fatigue-testing protocol. The Ethibond No. 2 suture was the weakest part of the anchor-suture combinations when they were loaded to failure by a single pull. Under cyclic-loading conditions, fixation strength was decreased compared with single-pull tests. The suture/anchor interface was identified as the weakest link in the Mitek GII/No. 2 combination and in the Zimmer Statak 3.5/No. 2 combination. In most cases the suture was worn through at the eyelet. Threading the GII anchor with a No. 5 suture and use of larger anchors in combination with No. 2 sutures increased the fatigue strength. Suture breakage at the knot was the predominant failure mode for biodegradable anchors inserted into cortical bone. The highest fatigue strength was seen for the Super Anchor/No. 5 combination when the anchor was inserted in cortical bone. Fatigue testing is crucial for evaluation of suture anchors and should be performed along with single-pull testing. The mechanical performance of a suture anchor threaded with a defined suture depends on several key factors: the pullout strength of the anchor, the tensile strength of the suture, and the interaction of anchor and suture at the eyelet (suture/anchor interface). PMID:11912095

Rupp, Stefan; Georg, Thomas; Gauss, Christian; Kohn, Dieter; Seil, Romain

2002-01-01

42

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. PMID:21760626

Nihalani, B R; Hunter, D G

2011-01-01

43

Simple suture and anchor in rabbit hips  

PubMed Central

Objective Using biomechanical studies, this research aims to compare hip capsulorrhaphy in rabbits, carried out with two different techniques: capsulorrhaphy with simple sutures and with anchors. Method Thirteen New Zealand Albino (Oryctolaguscuniculus) male rabbits, twenty-six hip joints, were used. First, a pilot project was performed with three rabbits (six hip joints). This experiment consisted of ten rabbits divided into two groups: group 1 underwent capsulorrhaphy on both right and left hips with simple suture using polyglycolic acid absorbable thread, and group 2 underwent capsulorrhaphy with titanium anchors. After a four-week postoperative period, the animals were euthanized and the hip joints were frozen. On the same day of the biomechanical studies, after the hip joints were previously unfrozen, the following parameters were evaluated: rigidity, maximum force, maximum deformity and energy. Results There was no relevant statistical difference in rigidity, maximum force, maximum deformity and energy between the simple suture and anchor groups. Conclusion Through biomechanical analyses, using parameters of rigidity, maximum force, maximum deformity and energy, it has been shown that capsulorrhaphy with simple suture and with anchors has similar results in rabbit hip joints. Level of Evidence II, Prospective Comparative Study. PMID:24453618

Garcia Filho, Fernando Cal; Guarniero, Roberto; de Godoy Junior, Rui Maciel; Pereira, Cesar Augusto Martins; Matos, Marcos Almeida; Garcia, Lucas Cortizo

2012-01-01

44

Instantaneous strain recovery elasticity and endothermic heat change in nylon-6 monofilaments and silicone rubbers  

Microsoft Academic Search

The instantaneous elastic moduli for a nylon-6 monofilament were derived on strain recoveries right after creep, stress relaxation, and rapid elongation,Ec,Es andEe, respectively. It was found that during strain recoveryEs(>Ee) andEe increase monotonically with increasing load,m1, on the sample. The extrapolated value of Es atm1=0 g is almost equal to Young's modulus, 4.06 GPa. The value ofEc also increased with

Nobuyuki Tanaka

1996-01-01

45

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

PubMed Central

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

2014-01-01

46

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

PubMed

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

Yorio, Pablo; Marinao, Cristian; Suárez, Nicolás

2014-08-15

47

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

PubMed Central

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

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

2012-01-01

48

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

PubMed

Avulsion or distal tendon laceration of flexor digitorum profundus (FDP) is classically repaired to the base of the distal phalanx via a pullout suture over a button. Bone suture anchors, used extensively in other surgical areas, have recently been proposed for reattachment of the FDP to the distal phalanx. The FDP tendons of the index, long, and ring fingers in 9 fresh frozen cadeveric hands were randomized to 1 of 3 repair techniques after simulated distal avulsion injuries. These were the pullout button using 3-0 monofilament nylon in a 2-strand Bunnell suture pattern, the 1.8 mm Mini QuickAnchor (Mitek Products, Norwood, MA) using 3-0 braided polyester in a 2-strand Bunnell suture pattern, and the Mitek micro anchor using 3-0 braided polyester with a modified 4-strand Becker suture pattern. Nine specimens were loaded to failure, noting maximum load and mode of failure. The 1.3 mm Micro QuickAnchor (Mitek) technique (69.6 +/- 10.8 N) was significantly stronger than the pullout button (43.3 +/- 4.8 N) or the Mini anchor technique (44.6 +/- 12.7 N). The Micro bone suture anchor provides a stronger tendon to bone repair than the pullout button or the Mini anchor. Given the disadvantages of the pullout button, the Micro bone suture anchor with the modified Becker technique is worth consideration as an alternative method to repair distal FDP avulsions. PMID:11418912

Brustein, M; Pellegrini, J; Choueka, J; Heminger, H; Mass, D

2001-05-01

49

Sutures and iris wound-healing in the baboon.  

PubMed

This paper reports an experimental study of iris wound-healing and the response of iris tissue in baboons to different suture materials following a planned surgical incision. The wound was sutured with 8-0 virgin silk, 22 mum Ethilon or 7-0 chromacised catgut, or left unsutured. The iris produces a minimal inflammatory response to aseptic trauma characterised by round cell infiltration, clump cell proliferation, pigment cell proliferation from the posterior epithelial surface and proliferation of non-pigmented ciliary epithelium (knots). This response is associated with microscopic hemorrhages in the iris. There does not appear to be any fibrous union of wound edges, instead the wound surfaces become lined with a layer of pigmented cells, probably from the posterior epithelium. Sutures play the dual role of accurately apposing the wound edges and, because there is no fibrous union of iris tissue, of keeping them in apposition. Therefore, they must remain in situ permanently. Catgut is poorly tolerated by the iris and is eventually absorbed. For these two reasons it is unsuitable. Ethilon is the least reactive and virgin silk only slightly more reactive. Both of these are suitable for iris suture. The suture material at present available is not entirely satisfactory. Finer suture material is required to reduce even more the iris response to sutures. Needles, even those supplied with Ethilon or virgin silk, are too large and clumsy. The answer to this problem probably lies in strengthening and sharpening the suture material ends so that they can act as needles. PMID:1098426

Luntz, M H; Kaufmann, J C; Spiller, M

1975-01-01

50

Barbed sutures in body surgery.  

PubMed

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

2013-09-01

51

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

NASA Technical Reports Server (NTRS)

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

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

1993-01-01

52

Force Sensing in Surgical Sutures  

PubMed Central

The tension in a suture is an important factor in the process of wound healing. If there is too much tension in the suture, the blood flow is restricted and necrosis can occur. If the tension is too low, the incision opens up and cannot heal properly. The purpose of this paper is to describe the design and evaluation of the Stitch Force (SF) sensor and the Hook-In Force (HIF) sensor. These sensors were developed to measure the force on a tensioned suture inside a closed incision and to measure the pulling force used to close the incision. The accuracy of both sensors is high enough to determine the relation between the force in the thread of a stitch and the pulling force applied on the suture by the physician. In a pilot study, a continuous suture of 7 stitches was applied on the fascia of the abdominal wall of multiple pigs to study this relationship. The results show that the max force in the thread of the second stitch drops from 3 (SD 1.2) to 1 (SD 0.3) newton after the 4th stitch was placed. During placement of the 5th, 6th and 7th stitch, the force in the 2nd stitch was not influenced anymore. This study indicates that in a continuous suture the force in the thread remains constant up to more than 3 stiches away from the pulled loose end of the suture. When a force feedback tool is developed specially for suturing in surgery on patients, the proposed sensors can be used to determine safety threshold for different types of tissue and sutures. PMID:24376812

Horeman, Tim; Meijer, Evert-jan; Harlaar, Joris J.; Lange, Johan F.; van den Dobbelsteen, John J.; Dankelman, Jenny

2013-01-01

53

Comparison of ultrasonic suture welding and traditional knot tying in a rabbit rotator cuff repair model.  

PubMed

The purpose of this study is to evaluate ultrasonic suture welding of monofilament suture in an animal model of rotator cuff repair with biomechanical and histologic analyses. We randomly assigned 46 shoulders in 23 rabbits to 1 of 3 treatment groups: sham-operated (n = 15), knotted (n = 15), and welded (n = 16). Supraspinatus defects were surgically created and acutely repaired with suture anchors loaded with either No. 2-0 Ethibond for knotted group or No. 2-0 nylon for welded shoulders. Eighteen weeks postoperatively, all animals were killed, and the shoulders underwent either biomechanical testing or histologic analysis. The maximum stress of the sham-operated group (20.6 N/mm2) was significantly greater than that of both the knotted (10.2 N/mm2) and welded (8.3 N/mm2) groups (P < .05), but no differences were observed between the knotted and welded groups. Although some histologic changes were noted, none was considered to be significant to distinguish either group. PMID:16979062

Nho, Shane J; Cole, Brian J; Mazzocca, Augustus D; Williams, James M; Romeo, Anthony A; Bush-Joseph, Charles A; Bach, Bernard R; Hallab, Nadim J

2006-01-01

54

The history of barbed sutures.  

PubMed

Ligatures have been used for millennia to close wounds. Sterilization and synthetic polymers that degrade in a commensurate fashion with wound healing have been the most significant improvements in these age-old devices. However, the constricting loop of a traditional suture and subsequent ischemia ("approximate, don't strangulate") still account for the most common cause of wound dehiscence-necrosis. Inspired by the quill of the North American porcupine, I envisioned a bidirectional array of barbs that could secure tissue without relying on constricting loops. One set of barbs could anchor the other. In this article, I document the development process of these barbed sutures from concept to patent to manufacture and US Food and Drug Administration approval. Knotless, strong, and easy to place, barbed sutures could foreseeably supplant conventional sutures, particularly as endoscopic procedures become more common. They also offer the intriguing potential to suspend ptotic tissues without surgical intervention. PMID:24084875

Ruff, Gregory L

2013-09-01

55

Craniosynostosis of the lambdoid suture.  

PubMed

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

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

2014-08-01

56

[Esthetic suture of the lower limbs after a saphenous vein graft in cardiac surgery. Polydioxanone vs Vicryl].  

PubMed

The vena saphena magna is widely used as a passage during myocardial revascularisation surgery (CABG). The preparation of the vein involves a long incision on the thigh and leg which is routinely closed using a continuous suture thread in Vicryl of the subcutis and continuous intradermal suture of the cutis. The authors retrospectively evaluated the functional and esthetic results of intradermal suture performed using two different types of reabsorbable thread: PDS II and Vicryl. A total of 178 patients underwent CABG surgery at the Heart Surgery Division of Tor Vergata University of Rome during the period January-September 1992. Mean age was 63 year +/- 7 (SD), 140 were males and 38 females. PDS II 3/0 was used for intradermal suture in 88 patients, whereas Vicryl 3/0 was used in 90. There were no significant differences between the two groups with regard to age, sex, number of grafts, associated pathologies or wound length. After 1-9 months (mean 5.6 months) the surgical wound on the saphenectomized limb was evaluated. It was found that compared to Vicryl the use of PDS II presented a higher incidence of keloids (p > 0.05). This was probably due to the greater reaction provoked in the dermis by the monofilament compared to twisted thread. The authors conclude that the use of a reabsorbable twisted thread, such as Vicryl or Vicryl Rapid, is preferable owing to the higher rate of compliance and lower incidence of complications. PMID:7816236

Actis Dato, G M; Persiani, M; Bassano, C; Ricci, A; Pierri, M D; Pellegrino, A

1994-10-01

57

Reproducibility and reliability of middle cerebral artery occlusion using a silicone-coated suture (Koizumi) in rats.  

PubMed

The best technical approach to rat middle cerebral artery occlusion (MCAO) using a nylon-monofilament suture remains unsettled, regarding the usefulness of coated or uncoated sutures. Three investigators with different degrees of experience: A, well skilled; B, 2 years of experience; C, a novice with 6 months of experience, each subjected 10 Sprague-Dawley rats to permanent MCAO using low-viscosity silicone-coated sutures with a mean diameter 0.468+/-0.013 mm (mean+/-S.D.) at the tip and 0.361+/-0.013 mm in the body. Post-mortem corrected infarct size 24 h after MCAO was similar among the three investigators: A, 204.7+/-33.2 mm3; B, 212.6+/-42.8, and C, 195.9+/-44.4. The coefficient of variation was 16.2% to 22.7%, and 19.4% for the three investigators. This study suggests that experimental stroke with silicone-coated sutures (Koizumi's method) provides good reproducibility and reliability, among investigators of varying experience. PMID:9455971

Takano, K; Tatlisumak, T; Bergmann, A G; Gibson, D G; Fisher, M

1997-12-01

58

Reattachment of greater trochanter after osteotomy for primary hip replacement: Dall-Miles cable or monofilament wires  

Microsoft Academic Search

A total of 102 cases of trochanteric reattachment were retrospectively evaluated clinically and radiologically after trochanteric osteotomy for primary total hip replacement. A comparison was made between the use of monofilament steel wires and Dall-Miles cable-grip system for reattachment of the greater trochanter. Wires were used in 52 patients while cables were used for 50 patients. Mean follow up was

N. Shah; C. V. R. Prasad

2003-01-01

59

21 CFR 882.4650 - Neurosurgical suture needle.  

Code of Federal Regulations, 2010 CFR

...2010-04-01 false Neurosurgical suture needle. 882.4650 Section 882.4650 Food...Devices § 882.4650 Neurosurgical suture needle. (a) Identification. A neurosurgical suture needle is a needle used in suturing during...

2010-04-01

60

The cell biology of suturing tendons  

Microsoft Academic Search

Trauma by suturing tendon form areas devoid of cells termed “acellular zones” in the matrix. This study aimed to characterise the cellular insult of suturing and acellular zone formation in mouse tendon. Acellular zone formation was evaluated using single grasping sutures placed using flexor tendons with time lapse cell viability imaging for a period of 12h. Both tension and injury

J. K. F. Wong; S. Alyouha; K. E. Kadler; M. W. J. Ferguson; D. A. McGrouther

2010-01-01

61

Thermal fatigue damage in monofilament reinforced copper for heat sink applications in divertor elements  

NASA Astrophysics Data System (ADS)

In fusion reactor systems extreme conditions require materials with high temperature and radiation resistance. The divertor component consists of a plasma facing W plate attached to a Cu heat sink to extract the heat from the nuclear reaction chamber coolant. The Coefficient of Thermal Expansion (CTE) mismatch between the W plate and the Cu heat sink causes interface delamination reducing the long term stability of the divertor. To avert this problem, composites are developed as interlayer materials with a high thermal conducting Cu matrix reinforced with up to 50 vol.% SiC or W monofilaments to increase the mechanical strength and to reduce the CTE mismatch. Thermal stresses are transferred from the macroscopic interface between the components into the bulk of the composite. Oscillating micro stresses may lead to fiber delamination and matrix damage during thermal cycling. Different matrix alloys, fiber materials and interface designs are investigated. In situ neutron diffraction performed during thermal cycling show the effect of bonding strength on the stress amplitudes expected under service conditions. The long term stability is tested by measurements after further ex situ cycling. Thermal fatigue damage and its propagation are visualized by in situ as well as ex situ high resolution synchrotron tomography. The combination of both methods helps to understand the strain induced damage mechanisms. Weak bonding leads to delamination of the fiber-matrix interfaces. Strong bonding causes severe matrix deformation and damage. Fiber cracks originating from sample production cause accumulating thermal fatigue damage during thermal cycling.

Schöbel, M.; Jonke, J.; Degischer, H. P.; Paffenholz, V.; Brendel, A.; Wimpory, R. C.; Di Michiel, M.

2011-02-01

62

Mechanical Influences on Suture Development and Patency  

PubMed Central

In addition to their role in skull growth, sutures are sites of flexibility between the more rigid bones. Depending on the suture, predominant loading during life may be either tensile or compressive. Loads are transmitted across sutures via collagenous fibers and a fluid-rich extracellular matrix and can be quasi-static (growth of neighboring tissues) or intermittent (mastication). The mechanical properties of sutures, while always viscoelastic, are therefore quite different for tensile versus compressive loading. The morphology of individual sutures reflects the nature of local loading, evidently by a process of developmental adaptation. In vivo or ex vivo, sutural cells respond to tensile or cyclic loading by expressing markers of proliferation and differentiation, whereas compressive loading appears to favor osteogenesis. Braincase and facial sutures exhibit similar mechanical behavior and reactions despite their different natural environments. PMID:18391494

Herring, Susan W.

2010-01-01

63

Nasal tip sutures part II: the interplays.  

PubMed

The achievement of consistently superior results in rhinoplasty is rendered difficult in part by a number of complex interplays between the anatomical structures of the nose and the techniques used for their alteration, such as tip sutures. The effects of sutures depend largely on the magnitude of suture tightening, the intrinsic forces on the cartilages, cartilage thickness, and the degree of soft-tissue undermining. The tip complex is perhaps the most intricate of the nasal structures, exhibiting subtle but evident responses to manipulations of the lower lateral cartilages. The three-dimensional effects of nine suture techniques that are frequently used in nasal tip surgical procedures are discussed and illustrated. (1) The medial crura suture approximates the medial crura and strengthens the support of the tip. The suture also has effects that are less conspicuous immediately. There is slight narrowing of the columella, caudal protrusion of the lobule, and minimal caudal rotation of the lateral crura. (2) The middle crura suture approximates the most anterior portion of the medial crura. There is greater strengthening of the tip and some approximation of the domes with this suture. (3) The interdomal suture approximates the domes and can equalize asymmetric domes. However, the entire tip may shift to the short side if there is a significant difference in the heights of the domes because of short lateral and medial crura. (4) Transdomal sutures narrow the domal arch while pulling the lateral crura medially. The net results are increased tip projection, alar rim concavity, and the potential need for an alar rim graft. In addition, depending on suture position, cephalic or caudal rotation of the lateral crura may be observed. (5) The lateral crura suture increases the concavity of the lateral crura, reduces the interdomal distance, and may retract the alar rims. Perhaps the most significant inadvertent results of this suture are caudal rotation of the tip and elongation of the nose. This is important because patients who undergo rhinoplasty would often benefit from cephalic, rather than caudal, rotation of the tip. (6) The medial crura-septal suture not only increases tip projection but also rotates the tip cephalically and retracts the columella. (7) The tip rotation suture shifts the tip cephalad while retracting the columella. (8) The medial crura footplate suture approximates the footplates, narrows the columella base, and improves undesirable nostril shape. (9) The lateral crura convexity control suture alters the degree of convexity of the lateral crura. The nuances of these sutures and their multiplanar effects on the nasal tip are discussed. PMID:12973233

Guyuron, Bahman; Behmand, Ramin A

2003-09-15

64

Mechanism of skull suture maintenance and interdigitation  

PubMed Central

Skull sutures serve as growth centers whose function involves multiple molecular pathways. During periods of brain growth the sutures remain thin and straight, later developing complex fractal interdigitations that provide interlocking strength. The nature of the relationship between the molecular interactions and suture pattern formation is not understood. Here we show that by classifying the molecules involved into two groups, stabilizing factors and substrate molecules, complex molecular networks can be modeled by a simple two-species reaction–diffusion model that recapitulates all the known behavior of suture pattern formation. This model reproduces the maintenance of thin sutural tissue at early stages, the later modification of the straight suture to form osseous interdigitations, and the formation of fractal structures. Predictions from the model are in good agreement with experimental observations, indicating that the model captures the essential nature of the interdigitation process. PMID:19811566

Miura, Takashi; Perlyn, Chad A; Kinboshi, Masato; Ogihara, Naomichi; Kobayashi-Miura, Mikiko; Morriss-Kay, Gillian M; Shiota, Kohei

2009-01-01

65

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

PubMed Central

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

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

2012-01-01

66

Nasal capsular cartilage is required for rat transpalatal suture morphogenesis  

Microsoft Academic Search

In the cranial vault, suture morphogenesis occurs when the growing cranial bones approximate and overlap or abut one another. Patency of developing sutures is regulated by the underlying dura mater. Once cranial sutures form, bone growth proceeds from the sutures in response to growth signals from the rapidly expanding neurocranium. Facial sutures do not develop in contact with the dura

Katayoun Adab; Jennifer R. Sayne; David S. Carlson; Lynne A. Opperman

2003-01-01

67

Transoral Mucosal Excision Sutured Gastroplasty  

PubMed Central

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

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

2014-01-01

68

The double loop mattress suture.  

PubMed

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

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

2014-01-01

69

Vascular Anastomosis--Sutures, Staples or Glue?  

PubMed Central

Different vascular suturing techniques were assessed in the experimental laboratory. Staples made of tantulum wire were employed for vascular anastomoses in normal dogs' arteries and veins and in atherosclerotic rabbits' aortas. The staples were driven with the NRC Vascular Suturing Instrument. In a similar series of experiments a plastic bonding agent (Eastman 910) was used. The anastomosed vessels were found to be patent and few complications were encountered. However, it is unlikely that the conventional suture technique with the currently available materials will be replaced by these methods except under special circumstances. Clinical application of the stapling method is envisaged in the anastomosis of small vessels and in situations when speed is essential, whereas the bonding agent promises to be useful as an ancillary method in combination with sutures or staples. ImagesFig. 2 PMID:14199107

Zingg, W.; Khodadadeh, M.

1964-01-01

70

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.

71

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

NASA Technical Reports Server (NTRS)

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

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

1972-01-01

72

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. PMID:23767007

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

2013-01-01

73

Pullout strength of suture anchors in comparison with transosseous sutures for rotator cuff repair.  

PubMed

Suture anchors are increasingly gaining importance in rotator cuff surgery. This means they will be gradually replacing transosseous sutures. The purpose of this study was to compare the stability of transosseous sutures with different suture anchors with regard to their pullout strength depending on bone density. By means of bone densitometry (CT scans), two groups of human humeral head specimens were determined: a healthy and a osteopenic bone group. Following anchor systems were being tested: SPIRALOK 5.0 mm (resorbable, DePuy Mitek), Super Revo 5 mm (titanium, Linvatec), UltraSorb (resorbable, Linvatec) and the double U-sutures with Orthocord USP 2 (partly resorbable, DePuy Mitek) and Ethibond Excel 2 (non-resorbable, Ethicon). The suture anchors/double U-sutures were inserted in the greater tuberosity 12 times. An electromechanical testing machine was used for cyclic loading with power increasing in stages. We recorded the ultimate failure loads, the system displacements and the modes of failure. The suture anchors tended to bring about higher ultimate failure loads than the transosseous double U-sutures. This difference was significant in the comparison of the Ethibond suture and the SPIRALOK 5.0 mm-both in healthy and osteopenic bone. Both the suture materials and the SPIRALOK 5.0 mm showed a significant difference in pullout strength on either healthy or osteopenic bone; the titanium anchor SuperRevo 5 mm and the tilting anchor UltraSorb did not show any significant difference in healthy or osteopenic bone. There was no significant difference concerning system displacement (healthy and osteopenic bone) between the five anchor systems tested. The pullout strength of transosseous sutures is neither on healthy nor on osteopenic bone higher than that of suture anchors. Therefore, even osteopenic bone does not constitute a valid reason for the surgeon to perform open surgery by means of transosseous sutures. The choice of sutures in osteopenic bone is of little consequence anyway since it is mostly the bone itself which is the limiting factor. PMID:18193198

Pietschmann, Matthias F; Fröhlich, Valerie; Ficklscherer, Andreas; Hausdorf, Jörg; Utzschneider, Sandra; Jansson, Volkmar; Müller, Peter E

2008-05-01

74

A bidirectional interface growth model for cranial interosseous suture morphogenesis  

PubMed Central

Interosseous sutures exhibit highly variable patterns of interdigitation and corrugation. Recent research has identified fundamental molecular mechanisms of suture formation, and computer models have been used to simulate suture morphogenesis. However, the role of bone strain in the development of complex sutures is largely unknown, and measuring suture morphologies beyond the evaluation of fractal dimensions remains a challenge. Here we propose a morphogenetic model of suture formation, which is based on the paradigm of Laplacian interface growth. Computer simulations of suture morphogenesis under various boundary conditions generate a wide variety of synthetic sutural forms. Their morphologies are quantified with a combination of Fourier analysis and principal components analysis, and compared with natural morphological variation in an ontogenetic sample of human interparietal suture lines. Morphometric analyses indicate that natural sutural shapes exhibit a complex distribution in morphospace. The distribution of synthetic sutures closely matches the natural distribution. In both natural and synthetic systems, sutural complexity increases during morphogenesis. Exploration of the parameter space of the simulation system indicates that variation in strain and/or morphogen sensitivity and viscosity of sutural tissue may be key factors in generating the large variability of natural suture complexity. PMID:21539540

Zollikofer, Christoph P E; Weissmann, John David

2011-01-01

75

The cell biology of suturing tendons  

PubMed Central

Trauma by suturing tendon form areas devoid of cells termed “acellular zones” in the matrix. This study aimed to characterise the cellular insult of suturing and acellular zone formation in mouse tendon. Acellular zone formation was evaluated using single grasping sutures placed using flexor tendons with time lapse cell viability imaging for a period of 12 h. Both tension and injury were required to induce cell death and cell movement in the formation of the acellular zone. DNA fragmentation studies and transmission electron microscopy indicated that cells necrosed. Parallel in vivo studies showed that cell-to-cell contacts were disrupted following grasping by the suture in tensioned tendon. Without tension, cell death was lessened and cell-to-cell contacts remained intact. Quantitative immunohistochemistry and 3D cellular profile mapping of wound healing markers over a one year time course showed that acellular zones arise rapidly and showed no evidence of healing whilst the wound healing response occurred in the surrounding tissues. The acellular zones were also evident in a standard modified “Kessler” clinical repair. In conclusion, the suture repair of injured tendons produces acellular zones, which may potentially cause early tendon failure. PMID:20600895

Wong, J.K.F.; Alyouha, S.; Kadler, K.E.; Ferguson, M.W.J.; McGrouther, D.A.

2010-01-01

76

Animal Models of Cranial Suture Biology  

PubMed Central

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

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

2012-01-01

77

Scapholunate ligament repair using suture anchors.  

PubMed

Background. This article describes the surgical repair of scapholunate ligament injury using Mitek suture anchors. Material and methods. 3 patients with neglected injuries of the scapholunate ligament were operated from 8 weeks to 5 months after trauma. The authors found that using the Mitek anchor suture simplifies the operative technique, obviates the technical difficulties involved in guiding the tendon through the bone tunnel, and reduces the possibility of the complications seen in the standard ligament repair techniques. Results and Conclusions. The operative technique used in the Clinic of Hand Surgery at the Medical University of Gdansk combines reduction of the displaced scaphoid bone from the dorsal approach and temporary scaphocapitate fixation with K wires, bringing the ruptured ligament closer with capsulodesis using Mitek suture anchors. PMID:17603433

Baczkowski, Bogus?aw; Lorczy?ski, Adam; Kabu?a, Jaros?aw; Camilleri, Rafa?

2006-04-28

78

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

SciTech Connect

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

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

2012-01-02

79

21 CFR 878.4930 - Suture retention device.  

Code of Federal Regulations, 2011 CFR

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

2011-04-01

80

21 CFR 878.4930 - Suture retention device.  

Code of Federal Regulations, 2013 CFR

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

2013-04-01

81

21 CFR 878.4930 - Suture retention device.  

Code of Federal Regulations, 2012 CFR

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

2012-04-01

82

21 CFR 878.4930 - Suture retention device.  

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

2014-04-01

83

The Use of Barbed Sutures in Obstetrics and Gynecology  

PubMed Central

Despite the multitude of different procedures performed with a host of different wound closure biomaterials, no study or surgeon has yet identified the perfect suture for all situations. In recent years, a new class of suture material—barbed suture—has been introduced into the surgeon’s armamentarium. This review focuses on barbed suture to better understand the role of this newer material in obstetrics and gynecology. PMID:21364859

Greenberg, James A

2010-01-01

84

Celebrity Arcade Suture Blepharoplasty for Double Eyelid  

Microsoft Academic Search

Background: In Taiwan, double-eyelid surgery is the most popular cosmetic surgical procedure. The technique preferred byplastic surgeons is the incision method because it is believed that this method can provide stable doubleeyelid results. It is the authors’ observation that patients prefer an invagination fold rather than a significantlyhigh fold. Suture blepharoplastymaycreate a relativelyeven and symmetric invagination fold. In the past,

Wen-Chieh Liao; Tung-Chain Tung; Tzong-Ru Tsai; Chia-Yi Wang; Chiu-Hwa Lin

2005-01-01

85

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

PubMed

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

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

2014-05-01

86

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

PubMed Central

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

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

2014-01-01

87

[Suture-free amniotic membrane transplantation].  

PubMed

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

2013-07-01

88

Squamosal suture craniosynostosis in Muenke syndrome.  

PubMed

Muenke syndrome caused by point mutation (C749G) in the FGFR3 gene affects 1 in 30,000 newborns and accounts for 25% to 30% of genetic causes of craniosynostosis. Anomalies in patients with Muenke syndrome include craniosynostosis, hypertelorism, sensorineural hearing loss, and developmental delay, among others. Most craniosynostoses in patients with Muenke syndrome involve bicoronal suture fusion. This article reports, for the first time, the existence of squamosal craniosynostosis in patients with Muenke syndrome. PMID:24448525

Doumit, Gaby D; Sidaoui, Joseph; Meisler, Eileen; Papay, Frank A

2014-03-01

89

Cranial suture biology of the Aleutian Island inhabitants.  

PubMed

Research on cranial suture biology suggests there is biological and taxonomic information to be garnered from the heritable pattern of suture synostosis. Suture synostosis along with brain growth patterns, diet, and biomechanical forces influence phenotypic variability in cranial vault morphology. This study was designed to determine the pattern of ectocranial suture synostosis in skeletal populations from the Aleutian Islands. We address the hypothesis that ectocranial suture synostosis pattern will differ according to cranial vault shape. Ales Hrdlicka identified two phenotypes in remains excavated from the Aleutian Island. The Paleo-Aleutians, exhibiting a dolichocranic phenotype with little prognathism linked to artifacts distinguished from later inhabitants, Aleutians, who exhibited a brachycranic phenotype with a greater amount of prognathism. A total of 212 crania representing Paleo-Aleuts and Aleutian as defined by Hrdlicka were investigated for suture synostosis pattern following standard methodologies. Comparisons were performed using Guttmann analyses. Results revealed similar suture fusion patterns for the Paleo-Aleut and Aleutian, a strong anterior to posterior pattern of suture fusion for the lateral-anterior suture sites, and a pattern of early termination at the sagittal suture sites for the vault. These patterns were found to differ from that reported in the literature. Because these two populations with distinct cranial shapes exhibit similar patterns of suture synostosis it appears pattern is independent of cranial shape in these populations of Homo sapiens. These findings suggest that suture fusion patterns may be population dependent and that a standardized methodology, using suture fusion to determine age-at-death, may not be applicable to all populations. PMID:21328563

Cray, James; Mooney, Mark P; Siegel, Michael I

2011-04-01

90

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

E-print Network

. These are the Molucca, Sorong, Sulawesi, Banda and Borneo sutures. Each of these sutures has a relatively short history. These are the Molucca, Sorong, Sulawesi, Banda and Borneo sutures (Fig. 2). The Borneo Suture is situated to this as eastern Indonesia. The account of the Sulawesi Suture is the work of both authors, whereas the accounts

Royal Holloway, University of London

91

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. PMID:19245501

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

2009-01-01

92

Barbed sutures in plastic surgery: a personal experience.  

PubMed

Secure closure of wounds is vital to any plastic surgery procedure. Recent developments in suture design have incorporated the creation of small barbs along the suture strand that are intended to engage the surrounding soft tissue and "lock" the suture (and, therefore, the wound closure) into place. Early experience with this type of modified suture has shown promise for a host of wound closure indications, including the closure of skin and fat as well as superficial and deep fascia. Advantages include secure wound closure, elimination of the need for a "third hand," decreased operative time, and an improved appearance in cutaneous scars. PMID:24084877

Hammond, Dennis C

2013-09-01

93

21 CFR 878.5010 - Nonabsorbable polypropylene surgical suture.  

Code of Federal Regulations, 2011 CFR

...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GENERAL AND PLASTIC SURGERY DEVICES Surgical Devices § 878.5010 Nonabsorbable polypropylene surgical suture. (a)...

2011-04-01

94

21 CFR 878.5010 - Nonabsorbable polypropylene surgical suture.  

Code of Federal Regulations, 2013 CFR

...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GENERAL AND PLASTIC SURGERY DEVICES Surgical Devices § 878.5010 Nonabsorbable polypropylene surgical suture. (a)...

2013-04-01

95

21 CFR 878.5020 - Nonabsorbable polyamide surgical suture.  

Code of Federal Regulations, 2011 CFR

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

2011-04-01

96

21 CFR 878.5020 - Nonabsorbable polyamide surgical suture.  

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

2014-04-01

97

21 CFR 878.5020 - Nonabsorbable polyamide surgical suture.  

Code of Federal Regulations, 2013 CFR

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

2013-04-01

98

21 CFR 878.5020 - Nonabsorbable polyamide surgical suture.  

Code of Federal Regulations, 2012 CFR

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

2012-04-01

99

21 CFR 878.5010 - Nonabsorbable polypropylene surgical suture.  

...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GENERAL AND PLASTIC SURGERY DEVICES Surgical Devices § 878.5010 Nonabsorbable polypropylene surgical suture. (a)...

2014-04-01

100

21 CFR 878.5010 - Nonabsorbable polypropylene surgical suture.  

Code of Federal Regulations, 2012 CFR

...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GENERAL AND PLASTIC SURGERY DEVICES Surgical Devices § 878.5010 Nonabsorbable polypropylene surgical suture. (a)...

2012-04-01

101

Stiffness and strength of suture joints in nature  

E-print Network

Suture joints are remarkable mechanical structures found throughout nature composed of compliant interlocking seams connecting stiffer components. This study investigates the underlying mechanisms and the role of geometry ...

Li, Yaning

102

Arthroscopic knots and strength sutures for rotator cuff repair.  

PubMed

Most arthroscopic rotator cuff reconstruction techniques require a method of securing the tendon to the bone to obtain a stable construct. The available options include knotless technology and suture welding, but the most common method uses suture anchors and knots. Tissue quality, surgical technique, repair material, and tension overload influence the stability of tissue repair. Arthroscopic knots are technically demanding because they are tied through cannulas with long-handled knot pushers. The strength of the repair is also influenced by the suture material used. In this study, we review the state-of-the-art of arthroscopic knots and suture materials being used for arthroscopic rotator cuff repair. PMID:21822109

Longo, Umile Giuseppe; Buchmann, Stefan; Berton, Alessandra; Maffulli, Nicola; Denaro, Vincenzo

2011-09-01

103

Blueschists in major suture zones of China  

NASA Astrophysics Data System (ADS)

Blueschist facies rocks and C-type eclogites occur as allochthonous terranes or as small tectonic blocks in almost all the accretionary fold belts and major suture zones within the interior of China and along the Circum-Pacific and Tethys-Himalayan belts. At least forty blueschist localities have been described. Blueschists around the Pacific margins and the Himalaya-Alpine belts are mostly Mesozoic in age; only those in Taiwan and New Caledonia are Cenozoic. Intracratonal blueschists of China are older than Late Permian, when the collision-amalgamation presumably occurred. Several alleged Precambrian blueschist localities [Ye, 1987] are shown in the recently published Metamorphic Map of China. A Precambrian(?) blueschist belt in Anhui-Hubei (central China) extends for about 2300 km. However, except for the pre-Sinian blueschist terrane in Aksu, the age determination for Precambrian blueschist metamorphism elsewhere has not been confirmed. Characteristic features of Chinese blueschists include the following: (1) blueschist facies metamorphism predates the continental collision-amalgamation, (2) most blueschists have undergone multistage metamorphism, commonly with increasing temperature and/or decreasing pressure for later events, (3) assemblages include sodic amphibole + epidote + albite + quartz + phengite + chlorite + sphene; lawsonite, jadeitic pyroxene, and aragonite are not common, and (4) protoliths are mainly mafic, pelagic, and clastic rocks. Blueschist facies metamorphism in China may be divided into two types on the basis of the imposed geothermal gradient, hence the progressive change in mineral assemblage. The rare lawsonite-bearing blueschists produced at lower temperatures and higher pressures are confined to the Inner Mongolia and Yarlung Zangbo suture zones where aragonite and possibly jadeitic pyroxene + quartz occur, and the blueschists are associated with subgreenschist facies rocks. Most other blueschists of China formed at higher temperatures along the transitional blueschist-greenschist facies boundary where epidote, sodic, and calcic amphiboles are ubiquitous, and the blueschists are interlayered with greenschist facies rocks. The common occurrence of intracratonal blueschists in major suture zones of China and elsewhere in Eurasia indicates pre-Mesozoic subduction-accretion of oceanic crust and flysch sediments. These zones of accretion represent growth around the periphery of major Precambrian cratons. This fact, together with the distribution of ophiolite belts and available paleomagnetic data, provides evidence for an extremely mobile history of plate movement in Eurasia. However, the Paleozoic intracontinental blueschists and ophiolites of China have formed before, rather than during, final closure between cratons. They do not usually mark the location of terminal sutures but are the result of earlier accretion and continental growth by subduction, underplating, and imbrication of oceanic materials similar to the accretion history of westernmost North America.

Liou, J. G.; Wang, Xiaomin; Coleman, R. G.; Zhang, Zh. M.; Maruyama, S.

1989-06-01

104

The effect of two nonresorbable suture types on the mechanical performance over a metal suture anchor eyelet.  

PubMed

An understanding of the mechanical properties of different suture materials is valuable when selecting the most appropriate suture and repair technique. Sutures should be strong, easy to handle and have high knot security. The introduction of suture anchors adds an additional variable regarding the effect of stress risers over the eyelet. Improving the mechanical properties of a suture may be a possible method to help avoid failure over stress risers such as the eyelet of suture anchor. This study examined the static and viscoelastic properties of a new polyethylene based non-resorbable suture (Fibrewire) over the eyelet of a standard anchor compared to braid polyester non-resorbable suture (Ethibond). Fibrewire had superior ultimate load properties compared to Ethibond (360.2 N+/-23.8 vs 191.9 N+/-17.3) as well as greater stiffness (61.3 N/mm+/-9.7 vs 8.1 N/mm+/-0.4) when tested in uniaxial tension through a metal anchor eyelet (Mitek) ( p<0.001). Fibrewire demonstrated greater stress relaxation than Ethibond ( p<0.05). Differences in the static and viscoelastic properties of suture may have implications in the post-operative period or during rehabilitation. PMID:13680105

Acton, D; Perry, A; Evans, R; Butler, A; Stephens, P; Bruce, W; Goldberg, J; Sonnabend, D; Walsh, W R

2004-03-01

105

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

USGS Publications Warehouse

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

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

2006-01-01

106

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

PubMed Central

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

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

2012-01-01

107

Perfect Metamaterial Absorber  

Microsoft Academic Search

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

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

2008-01-01

108

Surgical device for supporting corneal suturing  

NASA Astrophysics Data System (ADS)

A system for ophthalmic surgery support has been developed in order to minimize the residual astigmatism due to the induced irregular shape of the cornea by corneal suture. The system projects 36 light spots, from LEDs, displayed in a precise circle at the lachrymal film of the examined cornea. The displacement, the size and deformation of the reflected image of these light spots are analyzed providing the keratometry and the circularity of the suture. Measurements in the range of 32D - 55D (up to 23D of astigmatism are possible to be obtained) and a self-calibration system has been designed in order to keep the system calibrated. Steel precision spheres have been submitted to the system and the results show 99% of correlation with the fabricant's nominal values. The system has been tested in 13 persons in order to evaluate its clinical applicability and has been compared to a commercial keratometer Topcon OM-4. The correlation factors are 0,92 for the astigmatism and 0.99 for the associated axis. The system indicates that the surgeon should achieve circularity >=98% in order to do not induce astigmatisms over 3D.

Ventura, Liliane; Oliveira, Gunter C. D.; De Groote, Jean-Jacques; Sousa, Sidney J. F.; Saia, Paula

2009-02-01

109

Meniscal fixation with an absorbable stapleAn experimental study in dogs  

Microsoft Academic Search

An absorbable staple for meniscal fixation was developed and evaluated in an in vivo canine study. The staple consisted of\\u000a two rigid barbed legs, made of a copolymer of polyglycolic acid and polylactic acid, connected by a flexible suture made of\\u000a the same absorbable material. The staple was developed for arthroscopic use, eliminating the risk of nerve or vascular injuries

Theodosios D. Koukoubis; Richard R. Glisson; John A. Feagin Jr.; Anthony V. Seaber; Daniel Schenkman; Anastasios V. Korompilias; Deborah L. Stahl

1997-01-01

110

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. PMID:22073105

Gassner, Holger G.

2011-01-01

111

An aortic cinch to quell suture line bleeding.  

PubMed

Bleeding from an aortic suture line or cannula site may be difficult to control, especially in the patient with a fragile or dilated aorta. This method of wrapping a vascular graft around the aorta to relieve tension on the suture line and control bleeding is simple and effective, and it facilitates obtaining the proper tension of the wrapped graft. PMID:20172183

Vander Salm, Thomas J; Toran, Ann J

2010-03-01

112

Arthroscopic transosseous suture anchor technique for rotator cuff repairs.  

PubMed

The skin is incised 1 to 2 cm distal to the lateral portal. A transosseous tunnel is created through the greater tuberosity by a sharp penetrator, entering 1.5 to 2 cm distal to the top of the greater tuberosity. The penetrator exits medially, between the tip of the greater tuberosity and the articular surface of the humeral head, in the middle of the footprint. The first anchor, a 5-mm Spiralok (DePuy Mitek, Norwood, MA) is placed at the penetrator's exit site on the footprint. Using a specially designed suture leader, the lateral limb of the suture in the anchor, which passes through the previously created transosseous tunnel, is taken from the anchor and pulled out. The other suture end is passed through the supraspinatus tendon. The second suture, placed superficially in the anchor, is passed from the anchor through the supraspinatus tendon, as a mattress suture. If more anchors are required, the procedure should be repeated. The transosseous suture limb and the suture limb that is passed through the supraspinatus tendon are tied through the lateral portal. The knot tying is then performed with a sliding Delimar knot. The mattress suture, passing through the supraspinatus tendon, is tied through the anterior lateral portal. The knot tying procedure is repeated depending on the number of anchors. PMID:16651169

Cicak, Nikola; Klobucar, Hrvoje; Bicanic, Goran; Trsek, Denis

2006-05-01

113

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

1996-01-01

114

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. PMID:22609349

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

2012-01-01

115

Strain in the Braincase and Its Sutures During Function  

PubMed Central

The skull is distinguished from other parts of the skeleton by its composite construction. The sutures between bony elements provide for interstitial growth of the cranium, but at the same time they alter the transmission of stress and strain through the skull. Strain gages were bonded to the frontal and parietal bones of miniature pigs and across the interfrontal, interparietal and coronal sutures. Strains were recorded 1) during natural mastication in conjunction with electromyographic activity from the jaw muscles and 2) during stimulation of various cranial muscles in anesthetized animals. Vault sutures exhibited vastly higher strains than did the adjoining bones. Further, bone strain primarily reflected torsion of the braincase set up by asymmetrical muscle contraction; the tensile axis alternated between +45° and ?45° depending on which diagonal masseter/temporalis pair was most active. However, suture strains were not related to overall torsion but instead were responses to local muscle actions. Only the coronal suture showed significant strain (tension) during jaw opening; this was caused by the contraction of neck muscles. All sutures showed strain during jaw closing, but polarity depended on the pattern of muscle usage. For example, masseter contraction tensed the coronal suture and the anterior part of the interfrontal suture, whereas the temporalis caused compression in these locations. Peak tensile strains were larger than peak compressive strains. Histology suggested that the skull is bent at the sutures, with the ectocranial surface tensed and the endocranial surface predominantly compressed. Collectively, these results indicate that skulls with patent sutures should be analyzed as complexes of independent parts rather than solid structures. PMID:10918130

Herring, Susan W.; Teng, Shengyi

2010-01-01

116

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

PubMed Central

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

Haga, Sei; Nagata, Shinji

2014-01-01

117

Meniscal fixation with an absorbable staple. An experimental study in dogs.  

PubMed

An absorbable staple for meniscal fixation was developed and evaluated in an in vivo canine study. The staple consisted of two rigid barbed legs, made of a copolymer of polyglycolic acid and polylactic acid, connected by a flexible suture made of the same absorbable material. The staple was developed for arthroscopic use, eliminating the risk of nerve or vascular injuries associated with suture fixation. Eighty-two mongrel dogs underwent meniscal repair in this study, which was performed in two sequential parts. An incision was made in the medial meniscus at the peripheral third and was fixed with either the staple or with a single 3-0 PDS suture. The animals from the first part of the study, in which the biocompatibility of a prototype staple design, was evaluated were sacrificed at 3 days, 2 weeks, 6 weeks, 3 months, and 9 months. Those from the second part of the study, in which an improved staple design of the same material, was evaluated were sacrificed at 6 weeks, 4 months, and 1 year. The operated menisci were either examined histologically or were mechanically tested for tensile strength. Absorption of the staple began by 3 months and was almost complete by 1 year. Mechanically, the staple provided greater tensile strength augmentation of the meniscus than suture fixation for up to 4 months. In the long term, there was no difference between the staple and suture in enhancement of healing. PMID:9127849

Koukoubis, T D; Glisson, R R; Feagin, J A; Seaber, A V; Schenkman, D; Korompilias, A V; Stahl, D L

1997-01-01

118

A Knotless Suture Anchor: Technique for use in arthroscopic Bankart repair.  

PubMed

Arthroscopic Bankart repair performed using suture anchors most closely mimics open repair techniques. One of the challenges with the arthroscopic technique is tying consistent, good-quality arthroscopic knots. The unique Knotless Suture Anchor (Mitek Products, Westwood, MA) and method of use for arthroscopic Bankart repair is described. The Knotless Suture Anchor has a short loop of suture secured to the tail end of the anchor. A channel is located at the tip of the anchor that functions to capture the loop of suture after it has been passed through the ligament. The ligament is tensioned as the anchor is inserted into bone to the appropriate depth. The doubled suture configuration that is created with the loop increases the suture strength in the Knotless Suture Anchor compared with standard suture anchors with the same size suture. To my knowledge, this article describes the first knotless suture anchor. A secure, low-profile repair can be created without arthroscopic knot tying. PMID:11172255

Thal, R

2001-02-01

119

A smart radar absorber  

Microsoft Academic Search

This paper proposes a configuration for a smart radar absorber which is capable of both self-tuning and absorb while scan operation. The discussion is complemented by modelled and measured performance data.

Barry Chambers

1999-01-01

120

Arthroscopic coracoclavicular ligament reconstruction using biologic and suture fixation.  

PubMed

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

2007-07-01

121

Granuloma formation secondary to Achilles tendon repair with nonabsorbable suture  

PubMed Central

INTRODUCTION Several complications can be observed after Achilles tendon repairs. In this study we aimed to report granuloma formation secondary to Achilles tendon repair with Ethibond (Ethicon INC, Somerville, New Jersey) suture. PRESENTATION OF CASE A 31 year-old man operated for Achilles tendon rupture. The Ethibond suture was used for primary repair. The patient attended to polyclinic with the complaints of swelling and discharge around the operation site four months after operation. A mass around distal portion of the Achilles tendon was detected. The granulomatous tissue was excised. Inside the mass Ethibond suture was detected. On histopathologic examination, typical findings of the foreign body reaction were observed. No microorganism was cultivated in the tissue culture. The patient has no complaint on the twelfth month control after surgery. DISCUSSION The results of primary repair of Achilles tendon are good but several complications were reported. In tendon repairs generally nonabsorbable sutures are used. The Ethibond is nonabsorbable, braided suture. In the literature, granuloma formations secondary to the suture materials such as polygylactine and braided polyethylen–polyester after Achilles tendon repair were reported but granuloma secondary to the Ethibond is very rare. CONCLUSION Although Ethibond suture is a strong and safe material for Achilles tendon repairs it may cause soft tissue problems such as granuloma. PMID:25212905

Kara, Adnan; Celik, Haluk; Seker, Ali; Uysal, Mehmet Ali; Uzun, Metin; Malkoc, Melih

2014-01-01

122

Sutures in the Altaids: Implications for Continental Suturing and Growth (Invited)  

NASA Astrophysics Data System (ADS)

Ophiolites and melanges are remnants of vanished oceans in orogenic belts; therefore they are very important for defining sutures. However, as illustrated in the Altaids ophiolitic fragments can be formed at different tectonic settings. Some ophiolites in the Altaids may be substrate of oceanic island arcs or accreted fragments, such as those in Kazakhstan and East Junggar. Others are mainly melanges and mostly occur as blocks or slices in accretionary prisms, such as those in the southern Chinese Altay and southern Tianshan. Ages of ophiolites and melanges should be used to constrain the existence time of ancient oceans, which predate the accretionary process after their emplacement. These ophiolitic fragments or melanges do not necessarily represent real sutures. Ages of some ophiolitic fragments and melanges in Central Asia such as those in the Tianshan predate accretion/collision event and the incorporation of these ophiolitic fragments into accretionary complexes may reflect merely different phases of accretion instead of closure of a major ocean. Major oceans or real sutures can only be recognized by paleogeographical separation of typical faunas and/or floras as many orogenic systems contain archipelagos with second-hand ocean basins, a tectonic scenario similar to the present-day SE Asia. Paleomagnetic data and tectonic analysis enable us to conduct palinspastic reconstructions and can help define real sutures, such as the one in the Southern Tianshan as a main cryptic plane separating the Tarim craton to the south and the accretionary collages to the north from the late Paleozoic to the early Triassic. During most of the Paleozoic time, the Siberia Craton was distributed in the northwest and the Tarim Craton was in the southeast, while the Kazakhstan arc chain was in the west. The active margin of the Siberia Craton had wide accretionary complexes and accreted intra-oceanic arcs and terranes, the Kazakhstan arc chain was characterized by multiple subductions, while the northern margin of the Tarim Craton remained mostly a passive margin. The multiple convergence and accretion among these orogenic systems generated huge orogenic collages in the late Paleozoic and even early Triassic, in which two types of amalgamation happened: (1) orthogonal interactions and oroclinal stacking of the Kazakhstan composite arc chain, and (2) parallel collision of the Altai, East Junggar, and Tianshan arcs. Complicated orogensis may shed light on a better understanding of orogenic suturing and continental growth. Acknowledgements: NSFC (41230207, 41190070, 41190075)

Xiao, W.

2013-12-01

123

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

PubMed Central

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

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

2014-01-01

124

Perfect metamaterial absorber.  

PubMed

We present the design for an absorbing metamaterial (MM) with near unity absorbance A(omega). Our structure consists of two MM resonators that couple separately to electric and magnetic fields so as to absorb all incident radiation within a single unit cell layer. We fabricate, characterize, and analyze a MM absorber with a slightly lower predicted A(omega) of 96%. Unlike conventional absorbers, our MM consists solely of metallic elements. The substrate can therefore be optimized for other parameters of interest. We experimentally demonstrate a peak A(omega) greater than 88% at 11.5 GHz. PMID:18518577

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

2008-05-23

125

Composition for absorbing hydrogen  

DOEpatents

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

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

1995-01-01

126

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.

2003-04-01

127

Fibrous absorber solar collector  

SciTech Connect

A lightweight and durable solar collector employing a fibrous absorber is described. Sufficient fiber mass may be used to blanket all radiation. The absorber is disposed between a transparent cover and a heat insulating shield behind which may be a rigid collector container. A reflector disposed between the absorber and the insulation is optional. Air enters the collector passes into a duct near bottom of the absorber and across the width of the absorber, flows parallel to and through the thinnest dimension of the absorber conducting heat from the fiber at the depths of greatest absorption and then exits through a similar duct located near the top of the absorber and out of the collector.

Novinger, H.E.

1981-12-08

128

21 CFR 878.4495 - Stainless steel suture.  

Code of Federal Regulations, 2012 CFR

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

2012-04-01

129

21 CFR 878.4495 - Stainless steel suture.  

Code of Federal Regulations, 2013 CFR

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

2013-04-01

130

21 CFR 878.5030 - Natural nonabsorbable silk surgical suture.  

Code of Federal Regulations, 2012 CFR

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

2012-04-01

131

21 CFR 878.5030 - Natural nonabsorbable silk surgical suture.  

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

2014-04-01

132

21 CFR 878.4495 - Stainless steel suture.  

Code of Federal Regulations, 2011 CFR

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

2011-04-01

133

21 CFR 878.4495 - Stainless steel suture.  

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

2014-04-01

134

21 CFR 878.5030 - Natural nonabsorbable silk surgical suture.  

Code of Federal Regulations, 2013 CFR

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

2013-04-01

135

21 CFR 878.5030 - Natural nonabsorbable silk surgical suture.  

Code of Federal Regulations, 2011 CFR

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

2011-04-01

136

Stiffness and strength of suture joints in nature  

NASA Astrophysics Data System (ADS)

Suture joints are remarkable mechanical structures found throughout nature composed of compliant interlocking seams connecting stiffer components. This study investigates the underlying mechanisms and the role of geometry governing the unique mechanical behavior of suture joints. Analytical and numerical composite models are formulated for two suture geometries characterized by a single repeating wavelength (e.g., triangular and rectangular). Stiffness, strength, and local stress distributions are predicted to assess variations in deformation and failure mechanisms. A unique homogeneous stress field is observed throughout both the skeletal and interfacial components of the triangular geometry, thus providing advantages in load transmission, weight, stiffness, strength, energy absorption, and fatigue over the rectangular geometry. The results obtained have relevance to biomimetic design and optimization, suture growth and fusion, and evolutionary phenotype diversity.

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

2011-12-01

137

Modeling of Needle-Tissue Interaction Forces During Surgical Suturing  

PubMed Central

This paper presents a model of needle tissue interaction forces that a rigid suture needle experiences during surgical suturing. The needle-tissue interaction forces are modeled as the sum of lumped parameters. The model has three main components; friction, tissue compression, and cutting forces. The tissue compression force uses the area that the needle sweeps out during a suture to estimate both the force magnitude and force direction. The area that the needle sweeps out is a direct result of driving the needle in a way that does not follow the natural curve of the needle. The friction force is approximated as a static friction force along the shaft of the needle. The cutting force acts only on the needle tip. The resulting force and torque model is experimentally validated using a tissue phantom. These results indicate that the proposed lumped parameter model is capable of accurately modeling the forces experienced during a suture. PMID:24683499

Jackson, Russell C.; Cavusoglu, M. Cenk

2013-01-01

138

New Bactericidal Surgical Suture Coating Kushi N. Kumar,,  

E-print Network

- positive bacteria, is able to colonize on the surfaces of surgical implants and sutures and is responsible substitutes are urgently needed. Natural antimicrobial peptides (AMPs) are a group of amphiphilic short

Tew, Gregory N.

139

Standardization of test methodology: a comparison between three suture anchors  

E-print Network

other applications in human orthopedic surgery.4-6 The use of suture anchors has not been limited to orthopedics. They have also been used by Hom et al.7 in a pubovaginal sling procedure with reported excellent results... other applications in human orthopedic surgery.4-6 The use of suture anchors has not been limited to orthopedics. They have also been used by Hom et al.7 in a pubovaginal sling procedure with reported excellent results...

Jonnalagadda, Silpa P.

2005-08-29

140

Exhumation of blueschists along a Tethyan suture in northwest Turkey  

Microsoft Academic Search

A blueschist belt formed during the mid-Cretaceous (?88 Ma) high-pressure metamorphism of a passive continental margin sequence of shale, siltstone, quartzite and limestone occurs immediately south of the Tethyan suture in northwest Turkey. A transect across the Tethyan suture was mapped to constrain the exhumation of blueschist-facies assemblages. The presence of jadeite, glaucophane and lawsonite in the blueschists indicates P-T

Aral I. Okay; Nigel B. W. Harris; Simon P. Kelley

1998-01-01

141

Bearing area: a new indication for suture anchor pullout strength?  

PubMed

Studies performed to quantify the pullout strength of suture anchors have not adequately defined the basic device parameters that control monotonic pullout. The bearing area of a suture anchor can be used to understand and predict anchor pullout strength in a soft-bone model. First, conical-shaped test samples were varied in size and shape and tested for pullout in 5, 8, and 10 pcf sawbone models. Next, bearing area and pullout strength relationships developed from the test samples were validated against nine commercially available suture anchors, including the Mitek QuickAnchor and SpiraLok, Opus Magnum(2), ArthroCare ParaSorb, and Arthrex BioCorkscrew. The samples showed a direct correlation between bearing area and pullout strength. Increased insertion depth was a secondary condition that also increased pullout strength. The pullout strength for the suture anchors followed the predicted trends of conical devices based on their individual bearing areas. For the 5 and 8 pcf models, only two and three devices, respectively, fell outside the predicted pullout strength range by more than a standard deviation. The use of a synthetic sawbone model was validated against the pullout strength of an Arthrex Corkscrew in five fresh-frozen cadaver humeral heads. The bearing area of a suture anchor can be used to predict the pullout strength independent of design in a soft-bone model. This work helps provide a foundation to understand the principles that affect the pullout strength of suture anchors. PMID:19226593

Yakacki, Christopher Michael; Griffis, Jack; Poukalova, Mariya; Gall, Ken

2009-08-01

142

Behavior of sutures used in anterior cruciate ligament reconstructive surgery.  

PubMed

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 (UTL) with and without a knot, modulus of elasticity, effect of conditioning on the behavior of the suture, and plastic deformation were determined for each suture. Prior conditioning significantly improved the plastic deformation characteristics of all three sutures. Mersilene possessed the highest UTL both with and without knots, and its plastic deformation was significantly lower than that of Ticron or Ethibond. We feel that these characteristics make it the best suture for use in securing hamstring or tendon grafts in ACL surgery. Because of the high UTL achieved by Mersilene tape in the knotted surgical loop construct (nearly 500 N), it may be possible to achieve fixation integrity approaching that of interference fixation with bone blocks. PMID:8884727

Spencer, E E; Chissell, H R; Spang, J T; Feagin, J A; Manoff, E M; Rohatgi, S D

1996-01-01

143

Biomechanical testing of a new knotless suture anchor compared with established anchors for rotator cuff repair.  

PubMed

Various suture anchors are available for rotator cuff repair. For arthroscopic application, a knotless anchor was developed to simplify the intra-operative handling. We compared the new knotless anchor (BIOKNOTLESStrade mark RC; DePuy Mitek, Raynham, MA) with established absorbable and titanium suture anchors (UltraSorbtrade mark and Super Revo 5mmtrade mark; ConMed Linvatec, Utica, NY). Each anchor was tested on 6 human cadaveric shoulders. The anchors were inserted into the greater tuberosity. An incremental cyclic loading was performed. Ultimate failure loads, anchor displacement, and mode of failure were recorded. The anchor displacement of the BIOKNOTLESStrade mark RC (15.3 +/- 5.3 mm) after the first cycle with 75 N was significantly higher than with the two other anchors (Super Revo 2.1 +/- 1.6 mm, UltraSorb: 2.7 +/- 1.1 mm). There was no significant difference in the ultimate failure loads of the 3 anchors. Although the Bioknotlesstrade mark RC indicated comparable maximal pullout strength, it bares the risk of losing contact between the tendon-bone-interface due to a significantly higher system displacement. Therefore, gap formation between the bone and the soft tissue fixation jeopardizes the repair. Bioknotlesstrade mark RC should be used in the lateral row only when a double row technique for rotator cuff repair is performed, and is not appropriate for rotator cuff repair if used on its own. PMID:18396417

Pietschmann, Matthias F; Froehlich, Valerie; Ficklscherer, Andreas; Wegener, Bernd; Jansson, Volkmar; Müller, Peter E

2008-01-01

144

Externally tuned vibration absorber  

DOEpatents

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

Vincent, Ronald J. (Latham, NY)

1987-09-22

145

Methods for absorbing neutrons  

DOEpatents

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)

2012-07-24

146

Sutures and shear zones in the Arabian-Nubian Shield  

NASA Astrophysics Data System (ADS)

Deformational belts in the Arabian-Nubian Shield (ANS) are divided into: (1) those associated with sutures, both arc-arc and arc-continental; and (2) post-accretionary structures which include north trending shortening zones and northwest trending strike-slip faults. The arc-arc sutures manifest collision between arc terranes at -800-700 Ma. They are orientated east to northeast in the northern part of the ANS and north to north-northeast in the south. North or south verging ophiolitic nappes are associated with the east to northeast trending sutures. These nappes were steepened by upright folds associated with the final stages of collision between terranes. East or west verging ophiolitic nappes are associated with the north to north-northeast trending sutures. These were deformed by upright folds and strike-slip faults related to oblique collision between terranes and/or post-accretionary deformations. The arc-continental sutures define the eastern and western boundaries of the ANS and are marked by north trending deformational belts which accompanied collision of the ANS with east and west Gondwana at -750-650 Ma. The post-accretionary structures were developed between -650-550 Ma due to continued shortening of the ANS. This produced north trending shortening zones which offset the east to northeast trending sutures in the northern part of the ANS but were superimposed as co-axial deformation on the north to north-northeast trending sutures in the south. The shortening deformation culminated with the development of northwest trending strike-slip faults and shear zones.

Abdelsalam, M. G.; Stern, R. J.

1996-10-01

147

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

PubMed Central

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

2013-01-01

148

Solar energy absorber panel  

Microsoft Academic Search

Disclosed is a solar energy absorber panel comprising a heat absorbing and conducting sheet and an array of fluid conduits in thermal contact with the sheet. For a given efficiency, the weight of the panel is minimized by providing a sheet thickness of between about 0.001 inch and about 0.006 inch and a conduit density of between about 3 and

Godrick

1976-01-01

149

Thin Wideband Radar Absorbers  

Microsoft Academic Search

A procedure for the optimal design of thin wideband radar absorbers is presented. The resulting absorbers are implemented by printing a frequency selective surface on a lossy perforated substrate. A binary hill climbing optimization scheme with random restart is used to find optimal solutions. The method of moments in conjunction with the transmission line method is used to calculate the

Arya Fallahi; Alireza Yahaghi; Hans-Rudolf Benedickter; Habibollah Abiri; Mahmoud Shahabadi; Christian Hafner

2010-01-01

150

Multispectral metamaterial absorber.  

PubMed

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

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

2014-03-01

151

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. PMID:22540072

Islam, Aliya; Ehsan, Ambreen

2011-01-01

152

Recognizing surgeon's actions during suture operations from video sequences  

NASA Astrophysics Data System (ADS)

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

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

2014-03-01

153

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

2012-02-01

154

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

PubMed

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

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

2014-04-01

155

Internal absorber solar collector  

DOEpatents

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

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

1981-01-01

156

Suture retention strength of expanded polytetrafluoroethylene (ePTFE) graft.  

PubMed

Our meticulous investigation of ePTFE graft breakage when a wire placed at the edge of an ePTFE graft was pulled, revealed that, depending on the breakage pattern, a break starts much earlier than the peak suture retention strength, which is the current international indicator for anastomotic-site break strength. Furthermore, the breakage patterns differ based on the thickness of the wire and the fiber direction of the ePTFE graft. Based on these findings, we advocate measuring the peak suture retention strength using 0.10-mm sutures and a standardized wire thickness in order to assess the anastomotic retention strength of ePTFE grafts. PMID:20424667

Mine, Yoshinari; Mitsui, Hideya; Oshima, Yu; Noishiki, Yasuharu; Nakai, Mikizo; Sano, Shunji

2010-04-01

157

Triangular mattress suture in abdominal diastasis to prevent epigastric bulging.  

PubMed

In the classic abdominoplasty, the treatment of large diastasis recti with simple or vertical mattress sutures may result in a nonaesthetic bulge. The surgeon may produce a craniocaudal bulge deformity by treating the flaccidity in the horizontal plane only, although it occurs in all directions. The authors describe the triangular mattress suture for the treatment of large diastasis recti, and demonstrate the mechanism involved in producing an epigastric bulge. Also presented is their clinical experience with 56 patients, with a 3-year follow-up, using this new plication method. The triangular mattress suture is a simple, quick, and effective way to correct abdominal diastasis and to avoid the epigastric bulge deformity with no added morbidity. PMID:11216606

Ferreira, L M; Castilho, H T; Hochberg, J; Ardenghy, M; Toledo, S R; Cruz, R G; Tardelli, H

2001-02-01

158

Electromagnetic power absorber  

NASA Technical Reports Server (NTRS)

A structure is presented with a surface portion of dielectric material which passes electromagnetic radiation and with a portion below the surface which includes material that absorbs the radiation, the face of the structure being formed with numerous steep ridges. The steepness of the dielectric material results in a high proportion of the electromagnetic energy passing through the surface for absorption by the absorbing material under the surface. A backing of aluminum or other highly heat-conductive and reflective material lies under the face and has very steep protuberances supporting the absorbing and dielectric materials.

Iwasaki, R. S. (inventor)

1979-01-01

159

Lipid-absorbing Polymers  

NASA Technical Reports Server (NTRS)

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

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

1973-01-01

160

Thoracoscopic bronchoplasty using continuous sutures in complete monitor view.  

PubMed

Thoracoscopic sleeve lobectomy in a complete monitor view is rarely reported. In thoracoscopic bronchoplasty, the insertion of a needle to the optimal point at the appropriate angle is difficult because of the restricted movement, and the limitation of monitor visualization complicates the creation of extraluminal ligations for anastomosis of the deep part of the bronchus. We report a case of sleeve resection of the right upper lobe with continuous sutures in a complete monitor view. Anastomosis with continuous sutures, which requires only three knots, is thought to be useful for bronchoplasty in thoracoscopic surgical procedures. PMID:25193213

Ohata, Keiji; Zhang, Jitian; Ito, Shinya; Yoshimura, Takashi; Matsubara, Yoshito; Terada, Yasuji

2014-09-01

161

Bioabsorbable Tricalcium Phosphate Bone Cement Strengthens Fixation of Suture Anchors  

Microsoft Academic Search

Background  Failure of suture anchor fixation in rotator cuff repair can occur at different interfaces. Prior studies show fixation at\\u000a the bone-anchor interface can be augmented using polymethylmethacrylate (PMMA) cement, and screw fixation into bone can be\\u000a strengthened using bioabsorbable tricalcium phosphate cement.\\u000a \\u000a \\u000a \\u000a \\u000a Questions\\/purposes  We wished to determine whether augmentation of suture anchor fixation using bioabsorbable tricalcium phosphate cement would\\u000a increase pullout

Rayshad Oshtory; Derek P. Lindsey; Nicholas J. Giori; Faisal M. Mirza

2010-01-01

162

Multiband terahertz metamaterial absorber  

NASA Astrophysics Data System (ADS)

This paper reports the design of a multiband metamaterial (MM) absorber in the terahertz region. Theoretical and simulated results show that the absorber has four distinct and strong absorption points at 1.69, 2.76, 3.41 and 5.06 THz, which are consistent with ‘fingerprints’ of some explosive materials. The retrieved material parameters show that the impedance of MM could be tuned to match approximately the impedance of the free space to minimise the reflectance at absorption frequencies and large power loss exists at absorption frequencies. The distribution of the power loss indicates that the absorber is an excellent electromagnetic wave collector: the wave is first trapped and reinforced in certain specific locations and then consumed. This multiband absorber has applications in the detection of explosives and materials characterisation.

Gu, Chao; Qu, Shao-Bo; Pei, Zhi-Bin; Xu, Zhuo; Liu, Jia; Gu, Wei

2011-01-01

163

Absorbance modulation optical lithography  

E-print Network

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

Tsai, Hsin-Yu Sidney

2007-01-01

164

Multiband terahertz metamaterial absorber  

Microsoft Academic Search

This paper reports the design of a multiband metamaterial (MM) absorber in the terahertz region. Theoretical and simulated results show that the absorber has four distinct and strong absorption points at 1.69, 2.76, 3.41 and 5.06 THz, which are consistent with `fingerprints' of some explosive materials. The retrieved material parameters show that the impedance of MM could be tuned to

Chao Gu; Shao-Bo Qu; Zhi-Bin Pei; Zhuo Xu; Jia Liu; Wei Gu

2011-01-01

165

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

PubMed Central

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

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

2013-01-01

166

A safety technique for Mitek anchor suture rupture: a useful trick.  

PubMed

We propose that the simple method of passing an extra suture through the Mitek anchor eyelet before bony insertion provides a safety net against failure of the preloaded suture and gives extra strength to the core repair. PMID:21802866

Othman, Diaa; Le Cocq, Heather; Majumder, Sanjib

2011-09-01

167

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

PubMed Central

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

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

2014-01-01

168

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

Microsoft Academic Search

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

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

1984-01-01

169

The Yarlung Zangbo Suture Zone Ophiolites, Tibet: A Synthesis  

Microsoft Academic Search

This paper presents the main results of a research project focused on the Yarlung Zangbo Suture Zone (YZSZ) ophiolites and related mélanges and flysch. Study area is representing a 300 km long and 30 km wide segment. The Cretaceous ophiolites are remnants of Neo-Tethys basin which was almost totally consumed in a northward oriented subduction zone and southerly transported onto

R. Hebert; C. Guilmette; C. Dupuis; V. Dubois-Cote; F. Huot; J. Dostal; C. Wang; Y. Li

2006-01-01

170

Angiogenesis and osteogenesis in an orthopedically expanded suture  

NASA Technical Reports Server (NTRS)

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

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

1997-01-01

171

Risk Factors for Mesh/Suture Erosion Following Sacrocolpopexy  

PubMed Central

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

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

2008-01-01

172

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

1994-01-01

173

Predicting galvanic corrosion rates for SiC monofilament/magnesium metal-matrix composites in chloride, sulfate, and nitrate solutions  

SciTech Connect

The galvanic-corrosion behavior of SiC monofilament (MF) coupled to pure Mg and ZE41A Mg alloy was studied using the potentiodynamic polarization technique in concert with the mixed-potential theory. Local-corrosion penetration rates of pure Mg and ZE41A Mg were approximately equal to 1 cm/y in deaerated and oxygenated 3.15 wt % NaCl, 0.5 M Na{sub 2}SO{sub 4}, and 0.5 M NaNO{sub 3} (with the exception of pure Mg in the NaCl solution where the local-corrosion rate was approximately 6 to 7 cm/y). Galvanic corrosion between Mg and SiC MFs was under cathodic control. Galvanic-corrosion penetration rates varied from 0.046 to 7.3 cm/y depending on whether solutions were oxygenated and whether the cross section or circumferential surface of the SiC MFs was exposed. Generally, there were no strong correlations between galvanic-corrosion rates and type of electrolyte. The effect of NaF on galvanic-corrosion rates between pure Mg and SiC MF (cross section exposed) was investigated to explore the possibility of inhibiting galvanic corrosion. NaF (in a 5-g/L concentration) was very effective in reducing galvanic corrosion rates in deaerated 0.5 M Na{sub 2}SO{sub 4} and 0.5 M NaNO{sub 3}, and modestly effective in oxygenated 0.5 M Na{sub 2}SO{sub 4} and 0.5 M NaNO{sub 3}. NaF was relatively ineffective in 3.15 wt % NaCl.

Hihara, L.H.; Kondepudi, P.K. [Univ. of Hawaii, Honolulu (United States). Dept. of Mechanical Engineering

1993-12-31

174

A transducer for measuring force on surgical sutures  

PubMed Central

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

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

2010-01-01

175

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

E-print Network

% was white and only 0.5% was Hispanic. Also they mixed healthy subjects with severe disease subjects, even underwent surgical removal of the bilaterally impacted teeth at the same appointment. One side had sutures but he did not compare his technique with any other technique and by mixing healthy patients

Goldman, Steven A.

176

Mechanical energy absorber  

NASA Technical Reports Server (NTRS)

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. (inventor)

1993-01-01

177

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

PubMed Central

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

2014-01-01

178

Shock Absorbing System  

NASA Technical Reports Server (NTRS)

A lightweight, inexpensive shock-absorbing system, developed by Langley Research Center 20 years ago, is now in service as safety device for an automated railway at Duke University Medical Center. The transportation system travels at about 25 miles per hour, carrying patients, visitors, staff and cargo. At the end of each guideway of the system are "frangible," (breakable) tube "buffers." If a slowing car fails to make a complete stop at the terminal, it would bump and shatter the tubes, absorbing energy that might otherwise jolt the passengers or damage the vehicle.

1982-01-01

179

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

PubMed Central

Background Craniosynostosis, the premature fusion of calvarial sutures, is a common craniofacial abnormality. Causative mutations in more than 10 genes have been identified, involving fibroblast growth factor, transforming growth factor beta, and Eph/ephrin signalling pathways. Mutations affect each human calvarial suture (coronal, sagittal, metopic, and lambdoid) differently, suggesting different gene expression patterns exist in each human suture. To better understand the molecular control of human suture morphogenesis we used microarray analysis to identify genes differentially expressed during suture fusion in children with craniosynostosis. Expression differences were also analysed between each unfused suture type, between sutures from syndromic and non-syndromic craniosynostosis patients, and between unfused sutures from individuals with and without craniosynostosis. Results We identified genes with increased expression in unfused sutures compared to fusing/fused sutures that may be pivotal to the maintenance of suture patency or in controlling early osteoblast differentiation (i.e. RBP4, GPC3, C1QTNF3, IL11RA, PTN, POSTN). In addition, we have identified genes with increased expression in fusing/fused suture tissue that we suggest could have a role in premature suture fusion (i.e. WIF1, ANXA3, CYFIP2). Proteins of two of these genes, glypican 3 and retinol binding protein 4, were investigated by immunohistochemistry and localised to the suture mesenchyme and osteogenic fronts of developing human calvaria, respectively, suggesting novel roles for these proteins in the maintenance of suture patency or in controlling early osteoblast differentiation. We show that there is limited difference in whole genome expression between sutures isolated from patients with syndromic and non-syndromic craniosynostosis and confirmed this by quantitative RT-PCR. Furthermore, distinct expression profiles for each unfused suture type were noted, with the metopic suture being most disparate. Finally, although calvarial bones are generally thought to grow without a cartilage precursor, we show histologically and by identification of cartilage-specific gene expression that cartilage may be involved in the morphogenesis of lambdoid and posterior sagittal sutures. Conclusion This study has provided further insight into the complex signalling network which controls human calvarial suture morphogenesis and craniosynostosis. Identified genes are candidates for targeted therapeutic development and to screen for craniosynostosis-causing mutations. PMID:18076769

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

2007-01-01

180

Neutron Absorbing Alloys  

DOEpatents

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)

2004-05-04

181

Solar energy absorbing panel  

Microsoft Academic Search

A solar energy absorbing panel is provided which may be integrally incorporated into a conventional building structure so that it does not protrude from the normal contour of the building , and which utilizes components of the building structure as a part of the collecting apparatus to thereby minimize the cost thereof. The panel is composed of a plurality of

McArthur

1981-01-01

182

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. PMID:24106565

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

2013-01-01

183

Regeneration of sutured human peripheral nerves: an electrophysiological study.  

PubMed Central

Electrophysiological and clinical assessment of recovery of function was undertaken on 34 median and 33 ulnar nerve which had been resutured after complete section three and a half months to 24 years previously. An evaluation of different methods of repair was attempted. Our results suggested that re-exploration of the site of suture is indicated in the absence of voluntary activity on needle EMG by seven months (12 months for grafts), of an electrically evoked muscle action potential, measurable distal motor latency, or motor nerve conduction velocity by 10 months (14 months for grafts), or of clinically detectable voluntary muscle movement by 10 months after suture. By present techniques of repair useful prognostic information cannot be obtained by a consideration of sensory parameters either clinical or electrophysiological. PMID:422969

Donoso, R S; Ballantyne, J P; Hansen, S

1979-01-01

184

Twist1 dimer selection regulates cranial suture patterning and fusion  

Microsoft Academic Search

Saethre-Chotzen syndrome is associated with haploinsufficiency of the basic-helix-loop- helix (bHLH) transcription factor TWIST1 and is characterized by premature closure of the cranial sutures, termed craniosynostosis; however, the mechanisms underlying this defect are unclear. Twist1 has been shown to play both positive and negative roles in mesenchymal specification and differentiation, and here we show that the activity of Twist1 is

Jeannette Connerney; Viktoria Andreeva; Yael Leshem; Christian Muentener; Miguel A. Mercado; Douglas B. Spicer

2006-01-01

185

Probing Electrical Conductivity of the Trans-European Suture Zone  

Microsoft Academic Search

The Trans-European Suture Zone (TESZ) isthe largest tectonic boundary in Europe,crossing northwest-southeast through centralEurope from the North Sea to the Black Sea.More than 2000 kilometers long, it constitutesa complex transition between the thick andcold East European Craton (EEC)\\/BalticShield, created more than 650 million yearsago (Ma) during the Precambrian, and thewarmer, younger Paleozoic (650 to 250 Ma)central European mobile belts.

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

2006-01-01

186

Deep electromagnetic soundings conducted in Trans-European Suture Zone  

Microsoft Academic Search

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

Vladimir Yu. Semenov; Waldemar Jozwiak; Josef Pek

2003-01-01

187

Self-directed practice schedule enhances learning of suturing skills  

PubMed Central

Background Most preoperative surgical training programs experience challenges with the availability of expert surgeons to teach trainees. Some research suggests that trainees may benefit from being allowed to actively shape their learning environments, which could alleviate some of the time and resource pressures in surgical training. The purpose of this study was to investigate the effects of self-directed or prescribed practice schedules (random or blocked) on learning suturing skills. Methods Participants watched an instructional video for simple interrupted, vertical mattress and horizontal mattress suturing then completed a pretest to assess baseline skills. Participants were assigned to 1 of 4 practice groups: self-directed practice schedule, prescribed blocked practice schedule, prescribed random practice schedule or matched to the self-directed group (control). Practice of the skill was followed by a delayed (1 h) posttest. Improvement from pretest to posttest was determined based on differences in performance time and expert-based assessments. Results Analyses revealed a significant effect of group for difference in performance time of the simple interrupted suture. Random practice did not show the expected advantage for skill learning, but there was an advantage of self-directed practice. Conclusion Self-directed practice schedules may be desirable for optimal learning of simple technical skills, even when expert instruction is available. Instructors must also take into account the interaction between task difficulty and conditions of practice to develop ideal training environments. PMID:24284153

Safir, Oleg; Williams, Camille K.; Dubrowski, Adam; Backstein, David; Carnahan, Heather

2013-01-01

188

Modified technique for arthroscopic Bankart repair using anchor sutures.  

PubMed

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

2004-07-01

189

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

PubMed Central

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

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

2013-01-01

190

Ionized Absorbers in AGN  

NASA Technical Reports Server (NTRS)

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

Mathur, S.

1999-01-01

191

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.

1997-05-01

192

Corrosion resistant neutron absorbing coatings  

DOEpatents

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)

2012-05-29

193

Corrosion resistant neutron absorbing coatings  

DOEpatents

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

2013-11-12

194

Orientation of late Precambrian sutures in the Arabian-Nubian shield  

NASA Technical Reports Server (NTRS)

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

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

1990-01-01

195

Some effects of Bunnell suture on otherwise uninjured tendons in subhuman primates.  

PubMed

An experimental study was performed in rhesus monkeys (M. mulatta) to examine the contribution of Bunnell tendon suture to the production of postoperative tendon adhesions. It was found that Bunnell suture used with atraumatic technique caused a significant depression of in vitro tendon surface plasminogen activator activity, allowing the in vivo persistence and fibrous organization of fibrinous postoperative adhesions to sutured areas. Bunnell suture also produced coagulation necrosis of the sutured area of tendon. Collagen, which replaced the destroyed areas, was oriented randomly and frequently was continuous with surface tendon adhesions to surrounding connective tissues. Bunnell suture appears to be a cause of tendon adhesions in subhuman primates. The importance of fibrin and depressed local fibrinolysis in the relationship of tendon ischemia and adhesion formation is discussed. PMID:411189

Buckman, R F; Hufnagel, H V; Olivier, G; Buckman, P D; Zuidema, G D

1977-11-01

196

Absorber for solar power.  

PubMed

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

1974-10-01

197

Underwater acoustic omnidirectional absorber  

NASA Astrophysics Data System (ADS)

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

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

2014-02-01

198

Patterns and implications of extensive heterochrony in carnivoran cranial suture closure  

PubMed Central

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

Goswami, A; Foley, L; Weisbecker, V

2013-01-01

199

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

PubMed Central

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

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

2014-01-01

200

Arthroscopic Posterior Stabilization of the Shoulder Using a Percutaneous Knotless Mattress Suture Technique.  

PubMed

Posterior shoulder instability is far less common than anterior instability, and its arthroscopic treatment can be technically demanding. We describe a percutaneous arthroscopic technique for posterior shoulder stabilization using mattress sutures and knotless anchors. Spinal needles are used to pass the sutures percutaneously in a mattress fashion. Knotless anchors are used to secure the sutures under the labrum. These anchors can be used without cannulas, giving easier access to the posterior glenoid. This procedure is simple, cost-effective, and safe, avoiding the presence of both knots and suture strands in contact with the humeral head. PMID:24749039

Tennent, Duncan; Concina, Chiara; Pearse, Eyiyemi

2014-02-01

201

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

PubMed Central

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

Reckhenrich, Ann Katharin; Kirsch, Bianca Manuela; Wahl, Elizabeth Ann; Schenck, Thilo Ludwig; Rezaeian, Farid; Harder, Yves; Foehr, Peter; Machens, Hans-Gunther; Egana, Jose Tomas

2014-01-01

202

Metamaterial saturable absorber mirror.  

PubMed

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

Dayal, Govind; Ramakrishna, S Anantha

2013-02-01

203

Sensing with THz metamaterial absorbers  

E-print Network

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

Cong, Longqing

2014-01-01

204

Metamaterial electromagnetic wave absorbers.  

PubMed

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

2012-06-19

205

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.

1984-01-01

206

A comparison of two selective interrupted suture removal techniques for control of post keratoplasty astigmatism.  

PubMed Central

PURPOSE: Two selective interrupted suture removal techniques were compared to determine which technique resulted in earliest, best visual acuity and least postoperative astigmatism. METHODS: Sixty-five consecutive optical penetrating keratoplasties were performed using 12 interrupted 10-0 nylon sutures and a 12-bite continuous 10-0 nylon suture, and were alternately assigned to 1 of 2 selective suture removal groups. All patients had refraction, keratometry, and videokeratoscopy postoperatively, starting at 6 weeks. Six weeks postoperatively, Group I underwent simultaneous removal of six alternate sutures, with the first of the 6 sutures removed at the steepest meridian, while Group II had selective sutures removed only at the steepest meridian, if associated with greater than 2 diopters of astigmatism in that meridian. Subsequently, interrupted sutures were then selectively removed until the resultant astigmatism approached 3.0 diopters or less. Measurements of resultant astigmatism are reported prior to selective suture removal, following selective suture removal, at 6 months postoperatively, at the completion of all selective suture removal, and at the final visit. RESULTS: At 6 months, residual astigmatism after the 2 techniques of selective suture removal, as measured by refraction, keratometry, and computer-assisted videokeratoscopy, was 2.8, 3.0 and 3.4 diopters for Group I, and 2.2, 2.6 and 3.7 diopters for Group II. At 1 year, the average final visit, astigmatism was 2.5, 2.4 and 2.7 diopters for Group I, and 2.1, 2.0 and 2.3 diopters for Group II. By the final visit, a best corrected vision of 20/50 or better was achieved in 86% of eyes in Group I and in 65% of eyes in Group II, and there was a significant difference in average keratometry of 47.4 diopters in Group I compared to 46.0 diopters in Group II and, as measured by videokeratoscopy, 47.9 diopters in Group I compared to 45.8 diopters in Group II. CONCLUSIONS: Selective suture removal by either technique reduces keratoplasty astigmatism with residual interrupted and continuous sutures in place. The combined use of refraction, keratometry, and videokeratoscopy probably provides more reliable and reproducible quantitative measurements of astigmatism. Minimizing astigmatism by selective suture removal is a major factor in the attempt to achieve excellent and visual function in the majority of patients who have undergone penetrating keratoplasty. PMID:9440170

Forster, R K

1997-01-01

207

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. PMID:22942639

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

2012-01-01

208

Strength of different Krackow stitch configurations using high-strength suture.  

PubMed

The purpose of the present study concerning high-strength sutures was to determine whether increasing the number of locking loops with different size sutures or decreasing the suture size with increased suture strands would have any influence on the strength of Achilles tendon repair. A total of 32 fresh bovine Achilles tendon specimens were randomly assigned to 4 groups. For 3 of the groups, 1 suture was used (no. 2 or no. 5 FiberWire™ with 2 or 4 Krackow locking loops). For the fourth group, 2 sutures (2-0 FiberWire™) with 2 locking loops were used. After repair, the study groups underwent cyclic loading (0 to 200 N, 200 cycles) and then underwent tension to failure in a testing machine. Cyclic elongation, peak to peak displacement, ultimate load, stiffness, and failure mode were recorded for each specimen. The tendon width and thickness were measured in all specimens. The mean width, thickness, cyclic displacement, load to failure, and pull-out stiffness showed no differences among the 4 groups. The cyclic peak to peak displacements (0.01 ± 0.01 mm) were smallest with the no. 5 suture with 4 locking loops (p < .05), with no failure during cyclic loading, unlike in the other groups. In the group with 2-0 suture with 4 strands and 2 locking loops, 6 failed during cyclic loading. The number of locking loops used might have had an influence on the strength of the Krackow suture configuration using the larger diameter, high-strength sutures. However, decreasing the suture diameter, with a simultaneous increase in the number of strands, failed to improve the initial strength of the repair. PMID:23611415

Hapa, Onur; Erduran, Mehmet; Havitçio?lu, Hasan; Çeçen, Berivan; Ak?ahin, Ertu?rul; Güler, Serkan; Atalay, Ka?an

2013-01-01

209

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. PMID:20572900

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

2010-01-01

210

[Primary strength of conventional and alternative suture techniques of the rotator cuff. A biomechanical study].  

PubMed

The aim of this biomechanical study was to evaluate rotator cuff repair strength using different suture anchor techniques compared to conventional repair, taking into consideration the native strength of the supraspinatus tendon. Therefore, a defined defect of the supraspinatus was created in 50 freshly frozen cadaver specimen (group size n = 10; median age at death: 56 years). Five methods were employed for cuff repair: standard transosseous suture, modified transosseous suture with patch augmentation and three suture anchors (Acufex Wedge TAG, Acufex Rod TAG und Mitek GII). The maximum tensile load of the five techniques was: standard transosseous suture, 410 N; modified transosseous suture, 552 N; Wedge TAG, 207 N; Rod TAG, 217 N; Mitek GII, 186 N. The difference between the suture anchor and standard techniques were highly significant (P < 0.001). In this series, the Mitek Gll anchor showed the lowest anchor dislocation rate at 3% (n = 1). The Wedge TAG system had a dislocation rate of 27% (n = 8) and the Rod TAG system 43% (n = 13). Suture anchor techniques revealed about 20%, the standard technique 34% and its modification 60% of the hypothetically calculated native tendon strength. Compared to conventional transosseous suture techniques, the use of the suture anchors tested in this series does not significantly increase the primary fixation strength of rotator cuff repair. The metallic implant with two barbs (Mitek GII) seems to be superior to the polyacetal anchors when inserted into the spongiform bone of the greater tubercle. The considerably weaker repair strength needs to be taken into consideration in postoperative patient rehabilitation, especially after the use of suture anchors. PMID:11968555

Rickert, M; Witzel, U; Kölbel, R; Georgousis, H

2002-01-01

211

Assessing suturing techniques using a virtual reality surgical simulator.  

PubMed

Advantages of virtual-reality simulators surgical skill assessment and training include more training time, no risk to patient, repeatable difficulty level, reliable feedback, without the resource demands, and ethical issues of animal-based training. We tested this for a key subtask and showed a strong link between skill in the simulator and in reality. Suturing performance was assessed for four groups of participants, including experienced surgeons and naive subjects, on a custom-made virtual-reality simulator. Each subject tried the experiment 30 times using five different types of needles to perform a standardized suture placement task. Traditional metrics of performance as well as new metrics enabled by our system were proposed, and the data indicate difference between trained and untrained performance. In all traditional parameters such as time, number of attempts, and motion quantity, the medical surgeons outperformed the other three groups, though differences were not significant. However, motion smoothness, penetration and exit angles, tear size areas, and orientation change were statistically significant in the trained group when compared with untrained group. This suggests that these parameters can be used in virtual microsurgery training. PMID:20201052

Kazemi, Hamed; Rappel, James K; Poston, Timothy; Hai Lim, Beng; Burdet, Etienne; Leong Teo, Chee

2010-09-01

212

Bidirectional Barbed Suture: An Evaluation of Safety and Clinical Outcomes  

PubMed Central

Objective: To evaluate the safety and efficacy of using bidirectional barbed suture in laparoscopic myomectomy (LM) and total laparoscopic hysterectomy (TLH). Methods: This was a case series of clinical outcomes following 172 consecutive LM and TLH cases over a 1-year period conducted at a university teaching hospital. It included 172 women (ages 17 to 81), requiring a myomectomy or hysterectomy for symptomatic uterine fibroids, pelvic pain, or abnormal uterine bleeding; 117 women underwent TLH and 55 women underwent LM. Patients were contacted over the phone 6 months after surgery to inquire about number of days of postoperative vaginal bleeding, visits to the hospital due to bleeding, dyspareunia, and other potential complications. Results: For TLH, the average duration of surgery was 109 minutes, average uterine weight was 256 grams (range, 18 to 1242), and average blood loss was 71mL. In LM, average duration of surgery was 125 minutes, average weight of fibroids was 252g, average number of fibroids removed was 4.0, and average blood loss was 159mL. Seven percent of patients and 8% of their partners had persistent dyspareunia after surgery. There were no conversions to laparotomy. Conclusions: The use of bidirectional barbed suture appears to be safe for closing the vaginal cuff in a TLH and for closing the hysterotomy site during a laparoscopic myomectomy. PMID:21333192

Vellinga, Thomas T.; Twijnstra, Andries R.; Chavan, Niraj R.; Suzuki, Yoko; Greenberg, James A

2010-01-01

213

Suture Bridge Fixation of a Femoral Condyle Traumatic Osteochondral Defect  

PubMed Central

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

Bowers, Andrea L.

2008-01-01

214

Progress in smart radar absorbers  

NASA Astrophysics Data System (ADS)

Conventional (i.e. passive) radar absorbers are widely used for modifying the radar cross-section (RCS) of current military platforms but such absorbers may not have adequate performance to satisfy future requirements. Active absorbers, however, offer the potential to overcome the so-called Rozanov performance limit and to enable additional 'smart' functionality such as monitoring damage, adaptive control of RCS or target appearance, Identification-Friend-or-Foe (IFF) and Absorb-While-Scan (AWS) This paper outlines the concept and basic properties of a novel type of active radar absorber, the so-called Phase-Switched Screen (PSS). The basic PSS topology is then modified so as to enable it to operate as a smart radar absorber when used together with an external sensor and feedback control loop. The theoretical predictions are confirmed using data measured on transmission-line analogues of the smart PSS structure.

Chambers, Barry; Tennant, Alan

2003-07-01

215

Progress in smart radar absorbers  

Microsoft Academic Search

Conventional (i.e. passive) radar absorbers are widely used for modifying the radar cross-section (RCS) of current military platforms but such absorbers may not have adequate performance to satisfy future requirements. Active absorbers, however, offer the potential to overcome the so-called Rozanov performance limit and to enable additional 'smart' functionality such as monitoring damage, adaptive control of RCS or target appearance,

Barry Chambers; Alan Tennant

2003-01-01

216

A novel technique of rotator cuff repair using spinal needle and suture loop  

PubMed Central

Background We present a simple technique of arthroscopic rotator cuff repair using a spinal needle and suture loop. Methods With the arthroscope laterally, a spinal needle looped with PDS is inserted percutaneously into the shoulder posteriorly and penetrated through the healthy posterior cuff tear margin. Anteriorly, another spinal needle loaded with PDS is inserted percutaneously to engage the healthy tissue at the anterior tear margin. The suture in the anterior needle is then delivered into the suture loop of the posterior needle using a suture retriever. The posterior needle and loop are then pulled out carrying the anterior suture with it. The two limbs of this suture are then retrieved through a cannula for knotting. The same procedure is then repeated for additional suturing. Suture anchors placed over the greater tuberosity are used to complete the repair. Conclusion This is an easy method of rotator cuff repair using simple instruments and lesser time, hence can be employed at centers with less equipment and at reduced cost to the patient. PMID:21062442

2010-01-01

217

Palaeozoic terranes and their lithospheric boundaries within the Trans-European Suture Zone (TESZ): a review  

Microsoft Academic Search

The Trans-European Suture Zone (TESZ) is a broad and complex zone of terrane accretion separating ancient lithosphere of the Baltic Shield and East European Craton (EEC) from the younger lithosphere of western and southern Europe. There is debate about the number of terranes involved, and their origins. The most significant terrane boundaries, originally oceanic sutures, are poorly exposed, and are

T. C. Pharaoh

1999-01-01

218

Mechanical properties of cranial bones and sutures in 1-2-year-old infants.  

PubMed

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

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

2014-01-01

219

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

PubMed Central

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.

2013-01-01

220

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

Microsoft Academic Search

The shape of sea urchins may be determined mechanically by patterns of force analogous to those that determine the shape of a water droplet. This mechanical analogy implies skeletal flexibility at the time of growth. Although comprised of many rigid calcite plates, sutural collagenous ligaments could confer such flexibility if the sutures between plates loosened and acted as joints at

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

2002-01-01

221

Arthroscopic repair of peripheral triangular fibrocartilage complex tears with suture welding: a technical report.  

PubMed

This report presents a method of arthroscopic repair of the peripheral triangular fibrocartilage complex tears that replaces traditional suture knots with ultrasonic welding of sutures. This will help eliminate potential causes of ulnar-sided wrist discomfort during the postoperative period. PMID:17027791

Badia, Alejandro; Jiménez, Alexis

2006-10-01

222

The Importance of Craniofacial Sutures in Biomechanical Finite Element Models of the Domestic Pig  

PubMed Central

Craniofacial sutures are a ubiquitous feature of the vertebrate skull. Previous experimental work has shown that bone strain magnitudes and orientations often vary when moving from one bone to another, across a craniofacial suture. This has led to the hypothesis that craniofacial sutures act to modify the strain environment of the skull, possibly as a mode of dissipating high stresses generated during feeding or impact. This study tests the hypothesis that the introduction of craniofacial sutures into finite element (FE) models of a modern domestic pig skull would improve model accuracy compared to a model without sutures. This allowed the mechanical effects of sutures to be assessed in isolation from other confounding variables. These models were also validated against strain gauge data collected from the same specimen ex vivo. The experimental strain data showed notable strain differences between adjacent bones, but this effect was generally not observed in either model. It was found that the inclusion of sutures in finite element models affected strain magnitudes, ratios, orientations and contour patterns, yet contrary to expectations, this did not improve the fit of the model to the experimental data, but resulted in a model that was less accurate. It is demonstrated that the presence or absence of sutures alone is not responsible for the inaccuracies in model strain, and is suggested that variations in local bone material properties, which were not accounted for by the FE models, could instead be responsible for the pattern of results. PMID:22363727

Bright, Jen A.

2012-01-01

223

Modification of Siepser sliding suture technique for iris repair and endothelial keratoplasty.  

PubMed

We describe a technique for closed-chamber iris repair that prevents knot and suture tail exposure into the anterior chamber. This modification of the Siepser sliding slipknot suture technique is particularly important in the setting of combined or future endothelial keratoplasty to prevent mechanical damage to donor endothelium during transplantation. PMID:24767906

Schoenberg, Evan D; Price, Francis W

2014-05-01

224

Palaeomagnetic estimates of crustal shortening in the Himalayan thrusts and Zangbo suture  

Microsoft Academic Search

This article reports new palaeomagnetic results from precisely-dated late Palaeocene limestones from the former northern margin of the Indian subcontinent, now in Tibet, between the major Himalayan thrusts and the India-Tibet suture zone. Convergence in the suture and intracontinental thrusting can be estimated separately and are respectively found to be of the order of 550 km (+\\/-650 km) and 400

J. Besse; V. Courtillot; J. P. Pozzi; M. Westphal; Y. X. Zhou

1984-01-01

225

E ects of Monocular Deprivation and Reverse Suture On Orientation Maps Can Be Explained By  

E-print Network

E#11;ects of Monocular Deprivation and Reverse Suture On Orientation Maps Can Be Explained By Activity-Instructed Development of Geniculocortical Connections Kenneth D. Miller y and Ed Erwin #3; Depts Deprivation and Reverse Suture Text data: 34 text pages, 0 tables, 8 #12;gures. Address Correspondence To

Columbia University

226

Use of suture anchors in the reconstruction of soft tissue defects with pedicled muscle flaps.  

PubMed

Suture anchors have been commercially developed to facilitate stable attachment of soft tissues to bone. Although their use is well characterized in orthopedic literature, suture anchors may also be of benefit in the reconstruction of large soft tissue defects by plastic surgeons. Suture anchors (Mitek Surgical Products, Inc., Westwood, MA) were used to fasten pedicled muscle flaps to exposed bone in 7 patients at Duke University undergoing reconstruction of large soft tissue defects. The suture anchor appeared to provide stability for the advancement flap, and there were no suspected postoperative muscle dehiscences or suture breakages. The suture anchor provides an easy, secure method to attach soft tissue to exposed bone, and preliminary experience appears to support their use in certain soft tissue reconstruction procedures by plastic surgeons. Suture anchors should be reserved for cases in which a large muscle flap is needed to cover exposed bone and poses a risk of shearing away from the bone, or adequate periosteum and soft tissue is not available for standard suture techniques. PMID:16186705

Ravin, Adam G; Gonyon, Denis L; Levin, L Scott

2005-10-01

227

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

PubMed Central

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

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

2014-01-01

228

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

PubMed

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

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

2014-07-01

229

Healing time of incision infection after hepatobiliary surgery treated by needle-free incision suture closure  

PubMed Central

AIM: To compare the effectiveness of needle-free incision suture closure with butterfly tape and traditional secondary suturing techniques in treating incision infection. METHODS: Two hundred and twenty-three patients with incision infection following hepatobiliary surgery at a tertiary hospital were randomly divided into three groups: 90 patients were closed by needle-free incision suture closure, which gradually closed the incision wound when drainage from incision infection was visibly decreased and healthy granulation tissues had grown; 79 patients were closed by butterfly bandage; another 54 patients were closed by traditional secondary suturing technique. Healing time of incision infection was calculated from the beginning of dressing change to the healing of the incision. RESULTS: Healing time in the needle-free incision suture closure group (24.2 ± 7.2 d) was significantly shorter than that in the butterfly bandage group (33.3 ± 11.2 d) and the traditional secondary suturing group (36.2 ± 15.3 d) (P < 0.05). Healing time in the butterfly bandage group appeared to be slightly shorter than that in the secondary suture group, but the difference was not statistically significant (P > 0.05). CONCLUSION: Needle-free incision suture closure could gradually close the infection wound at the same time of drainage and dressing change, thereby shortening the healing time.

Ma, Wen-Jie; Zhou, Yong; Mao, Hui; Xu, Rui-Hua; Shrestha, Anuj; Li, Fu-Yu; Lorance, Alex; Yang, Qin; Zhang, Yong-Qiong; Jiang, Ting; Feng, Huan; Zhang, Wei; Cheng, Nan-Sheng

2014-01-01

230

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. PMID:12856844

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

2003-01-01

231

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

PubMed

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

2002-02-01

232

The Effect of Epitendinous Suture Technique on Gliding Resistance During Cyclic Motion After Flexor Tendon Repair: A Cadaveric Study  

PubMed Central

Purpose To investigate the effects of motion following repair with a modified Kessler core suture and 5 different epitendinous suture designs on the gliding resistance, breaking strength, 2-mm gap force, and stiffness of flexor digitorum profundus tendons in a human in vitro model. Methods The flexor digitorum profundus tendons of the index, middle, ring, and little fingers of 50 human cadavers were transected and repaired with a 2-strand modified Kessler suture and assigned to 5 groups based on type of epitendinous suture design. The 5 epitendinous designs tested were a simple, running epitendinous suture whose knot was outside the repair (simple running KO); a simple, running epitendinous suture whose knot was inside the repair (simple running KI); a cross-stitch epitendinous suture; an interlocking, horizontal mattress (IHM) epitendinous suture; and a running–locking epitendinous suture. The tendon repair strength and 2-mm gap force were measured after 1,000 cycles of tendon motion. The resistance to gap formation, a measure of repair stiffness, was obtained from the force versus gap data. Results None of the repairs showed any gap formation after 1,000 cycles of tendon motion. The cross-stitch epitendinous suture, IHM epitendinous suture, and running–locking epitendinous suture all had significantly lower gliding resistance than the simple running KO epitendinous suture after 1 cycle. The simple running KI epitendinous suture had significantly lower gliding resistance than the simple running KO epitendinous suture after 100 cycles and 1,000 cycles. The differences for gap force at 2 mm and stiffness of the repaired tendon evaluation were not statistically significant. The cross-stitch epitendinous suture, IHM epitendinous suture, and running–locking epitendinous suture all had significantly higher maximal failure strength after 1,000 cycles than the simple running KI epitendinous suture. Conclusions The cross-stitch, IHM, and running–locking epitendinous sutures had the best combination of higher strength and lower gliding resistance in this study. Although these findings suggest a potential for these suture types to be preferred as epitendinous sutures, these repairs should first be investigated in vivo to address their effect on tendon healing and adhesion formation. PMID:20189323

Moriya, Tamami; Zhao, Chunfeng; An, Kai-Nan; Amadio, Peter C.

2012-01-01

233

Bioinspired, mechanical, deterministic fractal model for hierarchical suture joints  

E-print Network

Many biological systems possess hierarchical and fractal-like interfaces and joint structures that bear and transmit loads, absorb energy, and accommodate growth, respiration, and/or locomotion. In this paper, an elastic ...

Boyce, Mary Cunningham

234

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

PubMed Central

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

Clendenning, Dawn E.; Mortlock, Douglas P.

2012-01-01

235

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. PMID:22419865

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

2012-01-01

236

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

Microsoft Academic Search

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

T K McAdam; R E McLaughlin; B McNicholl

2004-01-01

237

Effect of disagreement between refractive, keratometric, and topographic determination of astigmatic axis on suture removal after penetrating keratoplasty  

Microsoft Academic Search

BACKGROUND\\/AIMSPost-keratoplasty astigmatism can be managed by selective suture removal in the steep axis. Corneal topography, keratometry, and refraction are used to determine the steep axis for suture removal. However, often there is a disagreement between the topographically determined steep axis and sutures to be removed and that determined by keratometry and refraction. The purpose of this study was to evaluate

A R Sebai Sarhan; Harminder S Dua; Michelle Beach

2000-01-01

238

Metal-shearing energy absorber  

NASA Technical Reports Server (NTRS)

Device, consisting of tongue of thin aluminum alloy strip, pull tab, slotted steel plate which serves as cutter, and steel buckle, absorbs mechanical energy when its ends are subjected to tensile loading. Device is applicable as auxiliary shock absorbing anchor for automobile and airplane safety belts.

Fay, R. J.; Wittrock, E. P.

1971-01-01

239

Leaf absorbance and photosynthesis  

NASA Technical Reports Server (NTRS)

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

Schurer, Kees

1994-01-01

240

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

PubMed Central

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

2013-01-01

241

Development of silver nano-coatings on silk sutures as a novel approach against surgical infections.  

PubMed

The infections give rise to a range of clinical problems and prolong hospitalization with increased healthcare costs. Moreover, persistent infections exasperate the problem of antibiotic resistance. The aim of this study was the development of effective and low-cost antibacterial silver coatings on surgical sutures by adopting an innovative photochemical deposition process to prevent early contamination of surgical wounds. The silver deposition technology adopted in this work is an innovative process based on the in situ photoreduction of a silver solution. The samples were dipped in the silver solution and then exposed to UV radiation in order to induce the synthesis of silver clusters on the surface of the suture. The homogeneous distribution of silver particles on the surface and on the cross-section of the treated sutures was demonstrated. All the antibacterial studies clearly demonstrated that the use of novel silver treated sutures could represent clinical advantages in terms of the prevention of surgical infections against bacterial colonization. The silver coating deposited on the sutures demonstrated no cytotoxic effect on a selected cell population. The results obtained suggested that the antibacterial silver-coated sutures developed in this work could represent an interesting alternative to conventional sutures, with evident advantages in terms of prevention of the surgical infections and on the health costs. In addiction, very low concentrations of silver significantly inhibited the microbial load, without affecting the cell viability. PMID:24997984

De Simone, S; Gallo, A L; Paladini, F; Sannino, A; Pollini, M

2014-09-01

242

Midpalatal suture maturation: Classification method for individual assessment before rapid maxillary expansion  

PubMed Central

Introduction In this study, we present a novel classification method for individual assessment of midpalatal suture morphology. Methods Cone-beam computed tomography images from 140 subjects (ages, 5.6-58.4 years) were examined to define the radiographic stages of midpalatal suture maturation. Five stages of maturation of the midpalatal suture were identified and defined: stage A, straight high-density sutural line, with no or little interdigitation; stage B, scalloped appearance of the high-density sutural line; stage C, 2 parallel, scalloped, high-density lines that were close to each other, separated in some areas by small low-density spaces; stage D, fusion completed in the palatine bone, with no evidence of a suture; and stage E, fusion anteriorly in the maxilla. Intraexaminer and interexaminer agreements were evaluated by weighted kappa tests. Results Stages A and B typically were observed up to 13 years of age, whereas stage C was noted primarily from 11 to 17 years but occasionally in younger and older age groups. Fusion of the palatine (stage D) and maxillary (stage E) regions of the midpalatal suture was completed after 11 years only in girls. From 14 to 17 years, 3 of 13 (23%) boys showed fusion only in the palatine bone (stage D). Conclusions This new classification method has the potential to avoid the side effects of rapid maxillary expansion failure or unnecessary surgically assisted rapid maxillary expansion for late adolescents and young adults. PMID:24182592

Angelieri, Fernanda; Cevidanes, Lucia H. S.; Franchi, Lorenzo; Goncalves, Joao R.; Benavides, Erika; McNamara, James A.

2014-01-01

243

thin films as absorber  

NASA Astrophysics Data System (ADS)

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

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

2014-09-01

244

Ameloblastin Inhibits Cranial Suture Closure by Modulating Msx2 Expression and Proliferation  

PubMed Central

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

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

2013-01-01

245

B-Lynch suture technique to control postpartum hemorrhage in a patient with mullerian anomaly.  

PubMed

Congenital anomalies of the uterus may cause gynecologic, obstetric and fertility problems. Obstetrical complications are reported to occur more commonly with mullerian duct anomalies, such as postpartum hemorrhage (PPH). Uterine compression sutures may be effective in controlling PPH in these conditions as an alternative to hysterectomy, especially if the patient has a desire to conceive. As the shape of the uterus is changed in congenital malformation, the usage of compression sutures such as B-Lynch can be more difficult. In this study we report a case of PPH accompanying a large septae, treated with B-Lynch suture. A 24 year old, multigravid and nulliparous patient (G:3) was admitted to our clinic with vaginal bleeding and abdominal pain at 31 weeks of gestation. Emergency cesarean section was performed for abruptio placenta and PPH occurred subsequently. A deep uterine septum was revealed during operation. Intermittent fundal massage and intravenous uterotonics were used to improve uterine tonicity without any improvement. After the B-Lynch suture was performed, the bleeding diminished dramatically. As the shape of the uterus is changed in congenital malformation, the application of secondary interventions in postpartum hemorrhage can be more difficult. There can be slippage or overlapping of the suture while using a B-Lynch suture. Because the uterine shape is not completely distorted, patients with septate uterus can be candidates for a B-Lynch suture. There is no such reported case from the literature regarding efficacy of B-Lynch suture in mullerian anomalies. his case illustrates the potential benefits of B-Lynch compression suture in an uterus with mullerian anomalies. PMID:24591957

Boyar, Ibrahim Hakan; Boynukal?n, Fazilet Kübra; Boyar, Nuray; Vural, Mehmet

2011-01-01

246

Use of cone beam computed tomography to detect and remove a broken suture needle.  

PubMed

Suture needles can break when they are used to suture the oral mucosa, especially if they have been bent or if excessive force is applied. Several retrieval modalities have been discussed in the literature; these have focused mainly on locating the needle. Although the segment often is found and removed by the surgeon during the procedure, more extensive procedures and paraclinical diagnostics may be necessary. This article presents a case in which a lost suture needle was located using a cone beam computed tomography scan and retrieved via surgery. PMID:21062723

Hassani, Ali; Motamedi, Mohammamed Hosein Kalantar; Sadrimanesh, Roozbeh; Varshosaz, Masood; Moshiri, Roya; Vahdati, Seyed Aliakbar; Sadr-Eshkevari, Pooyan

2010-01-01

247

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

2010-01-01

248

[Morphological changes of tissues in formation of a welding suture on the large intestine].  

PubMed

Abdominoanal resection with descending of left colon on perineum, leaving additional part of a descended intestine, was performed. For the hemorrhage arrest the welding sutures were put on intestinal wall. According to morphological investigations data, a damage of intestinal wall in the zone of a welding suture application is a reversible one, it spreads from the electrode branch on 2-3 mm. The presence of undamaged structures witnesses the presence of an active regeneration process in tissues around the welding suture. PMID:21512998

Bondar', G V; Basheev, V Kh; Borota, A V; Miroshnichenko, E Iu; Koshik, E A

2011-01-01

249

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

2011-07-01

250

Countercurrent flow absorber and desorber  

DOEpatents

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.

1984-10-16

251

Packed Alumina Absorbs Hypergolic Vapors  

NASA Technical Reports Server (NTRS)

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

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

1984-01-01

252

Countercurrent flow absorber and desorber  

DOEpatents

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)

1984-01-01

253

Perfect selective metamaterial solar absorbers.  

PubMed

In this work, we numerically investigate the radiative properties of metamaterial nanostructures made of two-dimensional tungsten gratings on a thin dielectric spacer and an opaque tungsten film from UV to mid-infrared region as potential selective solar absorbers. The metamaterial absorber with single-sized tungsten patches exhibits high absorptance in the visible and near-infrared region due to several mechanisms such as surface plasmon polaritons, magnetic polaritons, and intrinsic bandgap absorption of tungsten. Geometric effects on the resonance wavelengths and the absorptance spectra are studied, and the physical mechanisms are elucidated in detail. The absorptance could be further enhanced in a broader spectral range with double-sized metamaterial absorbers. The total solar absorptance of the optimized metamaterial absorbers at normal incidence could be more than 88%, while the total emittance is less than 3% at 100°C, resulting in total photon-to-heat conversion efficiency of 86% without any optical concentration. Moreover, the metamaterial solar absorbers exhibit quasi-diffuse behaviors as well as polarization independence. The results here will facilitate the design of novel highly efficient solar absorbers to enhance the performance of various solar energy conversion systems. PMID:24514927

Wang, Hao; Wang, Liping

2013-11-01

254

Deformation and sedimentation along a developing terrane suture: Eastern Sunda forearc, Indonesia  

SciTech Connect

The collision of the eastern Sunda arc with northwest Australia has resulted in the development of a suture between the Sumba ridge and Sawu-Timor terranes along a zone of intraforearc convergence. The developing suture varies from the low-angle Sawu thrust, with attendant mud diapirs in the Sumba basin, to high-angle reverse faults near a basement high of the underthrust Sumba ridge terrane. Bottom currents, associated with the flow of Pacific Ocean deep water into the Indian Ocean, have eroded the terranes and subsequently deposited the detritus in an assemblage of contourites along the suture. This study reveals the high structural variability of a terrane suture and the oceanographic influence on the deposition of overlap assemblages.

Reed, D.L.; Silver, E.A.; Prasetyo, H.; Meyer, A.W.

1986-12-01

255

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

PubMed

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

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

2014-07-28

256

Arthroscopic double-locked stitch: a new technique for suturing rotator cuff tears.  

PubMed

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

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

2014-04-01

257

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

...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GENERAL AND PLASTIC SURGERY DEVICES Surgical Devices § 878.5000 Nonabsorbable poly(ethylene terephthalate) surgical suture....

2014-04-01

258

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

Code of Federal Regulations, 2011 CFR

...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GENERAL AND PLASTIC SURGERY DEVICES Surgical Devices § 878.5000 Nonabsorbable poly(ethylene terephthalate) surgical suture....

2011-04-01

259

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

Code of Federal Regulations, 2012 CFR

...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GENERAL AND PLASTIC SURGERY DEVICES Surgical Devices § 878.5000 Nonabsorbable poly(ethylene terephthalate) surgical suture....

2012-04-01

260

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

Code of Federal Regulations, 2013 CFR

...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GENERAL AND PLASTIC SURGERY DEVICES Surgical Devices § 878.5000 Nonabsorbable poly(ethylene terephthalate) surgical suture....

2013-04-01

261

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

PubMed

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

1988-11-01

262

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

National Technical Information Service (NTIS)

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 tsha...

J. W. Boyd, K. A. Deters, K. M. Carter, R. S. Brown

2009-01-01

263

Vein patch angioplasty with non-penetrating titanium clips. Comparison to standard suture technique.  

PubMed

Our purpose was to compare the Vascular Closure Staples (VCS) clips to a standard suture technique for vein patch angioplasty in a porcine model. Six female pigs underwent vein patch angioplasty of the common iliac arteries with either VCS clips or continuous suturing. The reconstructed vessels were evaluated macroscopically, angiographically and histologically after two months by re-operation. There was a non significant trend towards shorter reconstruction (6.5 +/- 1.8 min. for clips vs. 8.5 +/- 1.7 min. for sutures, p = 0.15) and clamp times when clips were used (8.4 +/- 1.5 min. vs. 10.1 +/- 1.3 min., p = 0.15). At re-operation all vessels were found patent without significant histological differences regarding the intimal reaction. VCS clips are a reliable alternative to sutures for vein patch angioplasty. PMID:20184062

Pikoulis, E; Rhee, P; Nishibe, T; Koronarchis, D; Leppäniemi, A; Karavokyros, I; Burris, D; Bakoyiannis, C; Fishback, N; Wherry, D; Rich, N

2009-01-01

264

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

PubMed

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

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

2014-02-01

265

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

PubMed Central

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

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

2014-01-01

266

Age dependence of fusion of primary occipital sutures: a radiographic study  

Microsoft Academic Search

Purpose  When linear lucency is present in the occipital bone on radiographs throughout childhood, differential diagnosis becomes important because some primary sutures are similar to fractures. The authors here chronicled the normal development of ossification centers, sutures, and synchondroses in the chondrocranium by radiographic examination.Methods  One hundred and twenty-seven children, aged from newborns to 6 years and without any skull base deformities, were

Kuniaki Nakahara; Satoshi Utsuki; Satoru Shimizu; Hideo Iida; Yoshio Miyasaka; Hiroshi Takagi; Hidehiro Oka; Kiyotaka Fujii

2006-01-01

267

The mendosal suture of the occipital bone: occurrence in Indian population, embryology and clinical significance  

Microsoft Academic Search

The Occipital occipital bone is ontogenetically and functionally unique when compared to the other bones of the skull in humans\\u000a and other mammalian cousins. The Occipital occipital bone develops from six ossification centers; any defect in the ossification\\u000a process will give rise to mendosal suture (accessory suture) and conditions like posterior plagiocephaly. There is a paucity\\u000a of literature regarding the

Soubhagya R. Nayak; Ashwin Krishnamurthy; S. J. Madhan Kumar; Latha V. Prabhu; P. J. Jiji; Mangala M. Pai; Arunachalam Kumar; Ramakrishna Avadhani

2007-01-01

268

Management of arterial puncture site after catheterization procedures: evaluating a suture-mediated closure device.  

PubMed

To overcome the challenge associated with achievement in hemostasis after a catheterization procedure, a suture-based closure device was compared with manual compression in a 600-patient randomized trial. The major study end points included the incidence of vascular complications and the time to ambulation after the procedure. The study included diagnostic or interventional procedures. The suture-mediated closure was performed immediately after the procedure independent of the anticoagulation level, whereas manual compression was performed per hospital protocol with sheath removal relying on normalization of patient's anticoagulation status. A significant reduction in time to achieve hemostasis (7.8 +/- 4.8 vs 19.6 +/- 13.2 minutes, p <0001) and time to ambulation (4.5 +/- 6.5 vs 17.8 +/- 5 hours, p <0001) was associated with use of the suture-mediated closure device. The incidence of vascular complications was similar in the overall population (5.7% for suturing device vs 11.3% for compression) or in the interventional patient subset (8.4% for suturing device vs 9.6% for compression). There was a significant reduction in the incidence of vascular complications in the diagnostic procedure subset (4.4% for suturing device vs 12.1% for compression, p <0.05). Thus, the use of a suture-mediated closure device represents a safe alternative to manual compression. Hemostasis and ambulation can be achieved faster with the suturing device than with manual compression, with a potential reduction in access site complications. PMID:10392872

Gerckens, U; Cattelaens, N; Lampe, E G; Grube, E

1999-06-15

269

Scanning electron microscopic study of the hydrolytic degradation of poly(glycolic acid) suture  

Microsoft Academic Search

This article reports the morphological observations on the surface changes of poly-(glycolic acid) sutures which have been exposed to various dosages of gamma irradiation (0, 2.5, 5.0, 10, 20 and 40 Mrad) and duration of immersion (0, 7, 14, 28, 48, 60, and 90 days) in a physiological saline buffer. The most important gross morphological characteristics of PGA suture hydrolytic

C. C. Chu; N. D. Campbell

1982-01-01

270

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

PubMed Central

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

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

2014-01-01

271

Simulator training for laparoscopic suturing using performance goals translates to the OR  

Microsoft Academic Search

Introduction: The purpose of this study was to test the effectiveness (transferability) of a performance-based laparoscopic suturing curriculum using simulators.Methods: Surgical residents (R3-R5, n = 10) proficient in basic skills but with minimal laparoscopic suturing experience were enrolled in an IRB-approved, randomized, controlled protocol. Subjects viewed an instructional video and were pre-tested on a live porcine laparoscopic Nissen fundoplication model

James R. Korndorffer; Rafael Seirra; J. Bruce Dunne; Daniel Scott

2004-01-01

272

Deep electromagnetic soundings conducted in Trans-European Suture Zone  

NASA Astrophysics Data System (ADS)

A consortium of nine geophysical institutions recently carried out a large-scale geomagnetic experiment focused on revealing the deep electrical structure beneath central and eastern Europe around the Trans-European Suture Zone (TESZ), the region's first-order geological lineament. The TESZ is considered a broad zone of deformation that crosses all of Europe, from the British Isles in the northwest to the Black Sea area in the southeast, and it most likely continues in North America [Keller and Hatcher, 1999].The geomagnetic experiment was called Central Europe Mantle Geoelectrical Structure (CEMES). Initiated by Polish scientists, geophysicists from eight other countries joined the project during a NATO Advanced Research Workshop held in the spring of 2001 in Belsk, Poland. The experimental phase of the project was held from 2001 through 2002; and altogether, 12 geomagnetic observatories, the international codes of which are shown among others in Figure 1, took part in acquiring the data. They will serve the objective of inferring information on the mantle conductivity structures beneath the region of TESZ, as well as beneath surrounding units, specifically the western part of the East European Craton (EEC), Variscides, including the Bohemian Massif, the Carpathians, and the Pannonian Basin.

Semenov, Vladimir Yu.; Jozwiak, Waldemar; Pek, Josef

273

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.

274

Postauricular fascial flap and suture otoplasty: a prospective outcome study of 227 patients.  

PubMed

The anterior scoring technique is criticised for a higher risk of haematoma related complications while the suture techniques for suture-extrusion and recurrence. Horlock et. al. described a suture otoplasty with addition of a postauricular fascial flap to reduce suture extrusion and noted recurrence rates of 8%. We report the senior author's experience with this technique in 227 consecutive cases. All cases were done by or under supervision of the senior author and the data collected prospectively. Complications, recurrence, revision rate and results as recorded were analysed. A total of 10 (7 early 3 late) complications were recorded (4.4%). Suture extrusion (n = 6, 2.64%), Keloids (n = 3, 1.32%), Infection, anterior skin necrosis (n = 1 each, 0.44%). A total of 6 unilateral and 5 bilateral cases had a recurrence (3.67% total ears) and 97% of recorded outcomes were reported as good or excellent results. The low complication rate seems to support the hypothesis that the fascial flap prevents suture extrusion and reduces risk of recurrence. Lack of Anterior dissection avoids risks of bleeding and haematoma. PMID:22071456

Sinha, Manish; Richard, Bruce

2012-03-01

275

Suture Versus Tack Fixation of Mesh in Laparoscopic Umbilical Hernia Repair  

PubMed Central

Background and Objectives: Mesh fixation in laparoscopic umbilical hernia repair is poorly studied. We compared postoperative outcomes of laparoscopic umbilical hernia repair in suture versus tack mesh fixation. Methods: Patients who underwent laparoscopic umbilical hernia repair were separated by method of mesh fixation: sutures versus primarily tacks. Medical history and follow-up data were collected through medical records. The primary outcome of this study was the recurrence rates of hernias. Postoperative major and minor complications, such as surgical site infection, small-bowel obstruction, and seroma formation, were regarded as secondary outcomes. Additionally, a telephone interview was conducted to assess postoperative pain, recovery time, and overall patient satisfaction. Results: Eighty-six patients were identified: 33 in the suture group and 53 in the tacks group. The number of emergent cases was increased in the tacks group (6 vs 0; P = .022). Mean follow-up time was 2.7 years for both groups. Documented postoperative follow-up was obtained in 29 (90%) suture group and 31 (58%) tacks group patients. Hernia recurrence occurred in 3 and 2 patients in the sutures and tacks groups, respectively (P was not significant). No differences were found in secondary outcomes, including subjective outcomes from telephone interviews, between groups. Conclusions: There are no differences in postoperative complication rates in suture versus tack mesh fixation in laparoscopic umbilical hernia repair. PMID:24398197

Kitamura, Riley K.; Choi, Jacqueline; Lynn, Elizabeth

2013-01-01

276

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.

2011-09-01

277

Mapping the Western Idaho Suture Zone Using Free Air Gravity and Topography  

NASA Astrophysics Data System (ADS)

The highly metamorphosed Western Idaho Suture Zone (WISZ; aka Salmon River Suture Zone) marks the contact between northeastern Oregon's Wallowa terrane and the craton. From near Boise to Orofino, ID the WISZ is very well defined and dips steeply as evidenced by lithologic contacts, closely spaced Sr87/Sr86 isopleths, and reasonably sharp Bouguer and aeromagnetic anomalies. To the south the WISZ plunges beneath the Snake River Plain. To the north Sr87/Sr86 ratios indicate a sharp turn to the west where the Miocene Columbia River Basalt Group covers the suture. Tracing the suture zone to the north is problematic. Mohl and Thiessen (1995, USGS PP 1438) use Bouguer and aeromagnetic anomalies to map the zone into SE Washington but indicate a need for higher resolution data to trace it to the north. Sporadic outcrops of sub-basalt cratonic rocks and isolated Sr87/Sr86 determinations have lead others to draw the suture into central Washington with tentative connections to British Columbia at around 120\\deg W. Where best defined the Western Idaho Suture Zone is only a few kilometers wide and separates lithospheric plates having contrasting histories and mechanical properties. The relationship of gravity to elevation provides a traditional method with which to map such boundaries by using estimates of elastic thickness. However, because plate properties change over a short distance across the suture there is a corresponding rapid change in the relation of gravity anomalies and topography which has proven difficult to locate with spectral methods dependent on long wavelength contributions to the correlation of gravity and elevation signals. Comparing free air gravity versus elevation from west of the suture zone yields a least-squares line with an intercept nearly 100 mgals higher than that for results from east of the suture; the two groups have similar slope and variance. Thus the intercept of a plot of gravity versus elevation nicely delineates the suture zone where it is otherwise obvious. Curiosity lead me to calculate the intercepts from correlations of free air gravity versus elevation for a large region surrounding the WISZ. I used windows of 80 km on a side with offsets of 2 km between the centers of windows. The result indicates the WISZ trends north through Idaho near the Purcell Fault and enters British Columbia near the WA-ID border at about 117\\deg W to merge with the Kootenay arc and eastern edge of Quesnellia.

Sheriff, S. D.

2001-12-01

278

Damage tolerant light absorbing material  

DOEpatents

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

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

1993-01-01

279

Damage tolerant light absorbing material  

DOEpatents

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.

1993-09-07

280

Anomalous Diffusion with Absorbing Boundary  

E-print Network

In a very long Gaussian polymer on time scales shorter that the maximal relaxation time, the mean squared distance travelled by a tagged monomer grows as ~t^{1/2}. We analyze such sub-diffusive behavior in the presence of one or two absorbing boundaries and demonstrate the differences between this process and the sub-diffusion described by the fractional Fokker-Planck equation. In particular, we show that the mean absorption time of diffuser between two absorbing boundaries is finite. Our results restrict the form of the effective dispersion equation that may describe such sub-diffusive processes.

Yacov Kantor; Mehran Kardar

2007-10-31

281

Polarization insensitive terahertz metamaterial absorber.  

PubMed

We present the simulation, implementation, and measurement of a polarization insensitive resonant metamaterial absorber in the terahertz region. The device consists of a metal/dielectric-spacer/metal structure allowing us to maximize absorption by varying the dielectric material and thickness and, hence, the effective electrical permittivity and magnetic permeability. Experimental absorption of 77% and 65% at 2.12 THz (in the operating frequency range of terahertz quantum cascade lasers) is observed for a spacer of polyimide or silicon dioxide respectively. These metamaterials are promising candidates as absorbing elements for thermally based terahertz imaging. PMID:21499411

Grant, J; Ma, Y; Saha, S; Lok, L B; Khalid, A; Cumming, D R S

2011-04-15

282

An omnidirectional electromagnetic absorber made of metamaterials  

Microsoft Academic Search

In a recent theoretical work by Narimanov and Kildishev (2009 Appl. Phys. Lett. 95 041106) an optical omnidirectional light absorber based on metamaterials was proposed, in which theoretical analysis and numerical simulations showed that all optical waves hitting the absorber are trapped and absorbed. Here we report the first experimental demonstration of an omnidirectional electromagnetic absorber in the microwave frequency.

Qiang Cheng; Tie Jun Cui; Wei Xiang Jiang; Ben Geng Cai

2010-01-01

283

An omnidirectional electromagnetic absorber made of metamaterials  

Microsoft Academic Search

In a recent theoretical work by Narimanov and Kildishev (2009 Appl. Phys. Lett.95 041106) an optical omnidirectional light absorber based on metamaterials was proposed, in which theoretical analysis and numerical simulations showed that all optical waves hitting the absorber are trapped and absorbed. Here we report the first experimental demonstration of an omnidirectional electromagnetic absorber in the microwave frequency. The

Qiang Cheng; Tie Jun Cui; Wei Xiang Jiang; Ben Geng Cai

2010-01-01

284

Analysis and design of multilayer Jaumann absorbers  

Microsoft Academic Search

In this paper, a transmission line model is constructed to analyze the performance of radar absorbing materials and the reflection characteristic of the resonance frequency. First, the paper introduces some kind of radar absorbing materials. Then, multilayer Jaumann absorbers are also analyzed using Smith Chart. Last, some multilayer Jaumann absorbers can be designed in the paper , which have good

Li Ke; Zhang Xin; Hou Xinyu; Zhang Peng

2011-01-01

285

Oil and fat absorbing polymers  

NASA Technical Reports Server (NTRS)

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

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

1977-01-01

286

Abbe's law, 210 absorbing media  

E-print Network

Index Abbe's law, 210 absorbing media apparent lack of energy conservation, 197--198 exceptions to reciprocity, 194--199 non­reversibility of optical paths, 196--197 reciprocity principle for, 198 for refraction, 145--146 adjoint, 147--148 angular form, 172 modified, 152 reciprocity principle for, 180

Stanford University

287

Radar Absorbing Applications of Metamaterials  

Microsoft Academic Search

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

Vasundara V. Varadan

2007-01-01

288

Reactive absorbers Absorption around resonance  

E-print Network

1 Reactive absorbers · Absorption around resonance = 2 m" (-res) +..... ( m"- c 2/l)=(-res) d d [ m silencers ­ Expansion chamber ­ Branch resonator #12;3 Silencers Source ZS Duct 1 Z1 Duct 2 Z2 Receiver ZR

Berlin,Technische Universität

289

Development and characterisation of silver-doped bioactive glass-coated sutures for tissue engineering and wound healing applications.  

PubMed

A novel silver-doped bioactive glass powder (AgBG) was used to coat resorbable Vicryl (polyglactin 910) and non-resorbable Mersilk surgical sutures, thereby imparting bioactive, antimicrobial and bactericidal properties to the sutures. Stable and homogeneous coatings on the surface of the sutures were achieved using an optimised aqueous slurry-dipping technique. Dynamic mechanical analysis (DMA) was used to investigate the viscoelastic parameters of storage modulus and tandelta and thermal transitions of the as-received and composite (coated) sutures. The results generally showed that the bioactive glass coating did not affect the dynamic mechanical and thermal properties of the sutures. The in vitro bioactivity of the sutures was tested by immersion in simulated body fluid (SBF). After only 3 days of immersion in SBF, bonelike hydroxyapatite formed on the coated suture surfaces, indicating their enhanced bioactive behaviour. Resorbable sutures with bioactive coatings as fabricated here, in conjunction with 3-D textile technology, may provide attractive materials for producing 3-D scaffolds with controlled porosities for tissue engineering applications. The bactericidal properties imparted by the Ag-containing glass coating open also new opportunities for use of the composite sutures in wound healing and body wall repair. PMID:14643606

Blaker, J J; Nazhat, S N; Boccaccini, A R

2004-01-01

290

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. PMID:18528857

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

2009-01-01

291

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

PubMed

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

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

2014-01-01

292

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

PubMed

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

1983-05-01

293

Long-term active antimicrobial coatings for surgical sutures based on silver nanoparticles and hyperbranched polylysine.  

PubMed

The goal of this study was to develop a long-term active antimicrobial coating for surgical sutures. To this end, two water-insoluble polymeric nanocontainers based on hyperbranched polylysine (HPL), hydrophobically modified by either using glycidyl hexadecyl ether, or a mixture of stearoyl/palmitoyl chloride, were synthesized. Highly stabilized silver nanoparticles (AgNPs, 2-5?nm in size) were generated by dissolving silver nitrate in the modified HPL solutions in toluene followed by reduction with L-ascorbic acid. Poly(glycolic acid)-based surgical sutures were dip-coated with the two different polymeric silver nanocomposites. The coated sutures showed high efficacies of more than 99.5% reduction of adhesion of living Staphylococcus aureus cells onto the surface compared to the uncoated specimen. Silver release experiments were performed on the HPL-AgNP modified sutures by washing them in phosphate buffered saline for a period of 30?days. These coatings showed a constant release of silver ions over more than 30?days. After this period of washing, the sutures retained their high efficacies against bacterial adhesion. Cytotoxicity tests using L929 mouse fibroblast cells showed that the materials are basically non-cytotoxic. PMID:23574366

Ho, Chau Hon; Odermatt, Erich K; Berndt, Ingo; Tiller, Joerg C

2013-01-01

294

Upper Mantle Structure Around the Trans-European Suture Zone  

NASA Astrophysics Data System (ADS)

The Trans-European Suture Zone (TESZ) is the transition between old Proterozoic lithosphere in Northern and Eastern Europe and the younger Phanerozoic lithosphere in Central and Western Europe. The presented study is a part of the PASSEQ 2006-2008 project which is linked to the TOR project realized during 1996-1997. The PASSEQ and the TOR projects aimed to study the lithosphere and asthenosphere structure around the TESZ, but the latter was focused on the northwestern part of the TESZ between Sweden and Denmark - Germany, while the PASSEQ project was focused on the TESZ mainly beneath Poland. During the PASSEQ project 139 short-period and 49 broadband temporary seismic stations were deployed along the transect stretching from Germany throughout Czech Republic and Poland to Lithuania. The array recorded continuous seismic data from May, 2006 to June, 2008. In our study we used data of all available PASSEQ seismic stations and seismic stations of the national seismological networks of the participating countries and compiled a data set of teleseismic P-wave arrivals. The full data set consists of 8308 manually picked arrivals. Due to limited computational power we used the data of the highest quality only, i.e. 6008 picks. The non-linear teleseismic tomography algorithm TELINV was used to obtain the model of P-wave velocity perturbations in the upper mantle around the TESZ. We recovered the upper mantle structure from 70 km down to 350 km in the study area. The results show ±6.5 % P-wave velocity variations compared to the IASP91 velocity model. We found higher velocities beneath the old East European Craton (EEC) east of the TESZ and lower ones beneath the younger Western Europe west of the TESZ. The thickest litosphere was found beneath the EEC (Lithuania) where the higher velocities continue to about 300 km or even more. To the west of the TESZ under the Variscides the average depth of the lithosphere-asthenosphere boundary (LAB) is about 100 km. The TESZ appears as an intermediate tectonic structure between the EEC and Western Europe, with the asthenospere at a depth of 150-180 km. The LAB in the northern part of the TESZ has a shape of the ramp dipping NE direction at an angle of about 30 degrees. In the southern part of the TESZ the LAB is shallower, most probably due to younger tectonic settings.

Janutyte, Ilma; Majdanski, Mariusz; Voss, Peter H.; Kozlovskaya, Elena

2014-05-01

295

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

PubMed Central

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

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

2014-01-01

296

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.

2009-02-27

297

Applications for a corneal mattress suture in anterior limbal wound repairs.  

PubMed

We describe the use of a corneal mattress suture to manage two complications of trabeculectomy: first, to repair an anterior conjunctival tear/disinsertion in a limbus-based conjunctival flap; and, second, to restore wound integrity by reinforcing a focal section of scleromalacia or to close a perforation remaining from a previous cataract wound encountered during complicated trabeculectomy. In each setting, a single, double-armed 10-0 nylon corneal mattress suture is used as an anchor to establish a watertight limbal-wound closure. Additionally, for repairing an area of a scleromalacia/perforation, the corneal mattress suture can be used to incorporate a graft of Tenon's fascia into the wound. PMID:7898869

Palmer, R M; Burgoyne, C F

1994-01-01

298

Suture granuloma mimicking a recurrent sacro-coccygeal pilonidal sinus after Limberg flap.  

PubMed

Sacro-coccygeal pilonidal sinus disease is classified as an asymptomatic, acutely abscess-forming or chronic subcutaneous inflammation in the sacro-coccygeal region featuring characteristic pits in the bottom cleft. Due to high rates of recurrence, two flap techniques have been established in the course of the past three decades. One of them is the Karydakis operation, the other option is a rotation flap named Limberg procedure. We report about a case of suture granuloma in the area of a Limberg flap after recurrent pilonidal sinus with extrusion of the suture material, thus mimicking recurrence. In case of recurrent pilonidal sinus following plastic coverage or primary closure, respectively, the differential diagnosis of suture granuloma should be considered. PMID:25124966

Ardelt, Michael; Dittmar, Yves; Schulz, Birte; Rauchfuss, Falk; Scheuerlein, Hubert; Settmacher, Utz

2014-12-01

299

Thermal Characterizations of silver-containing bioactive glass-coated Sutures.  

PubMed

This study utilized and compared a number of thermal analysis methods to characterize the thermal properties of commercial sutures with and without antimicrobial coatings of silver-doped bioactive glass (AgBG) interlocking particulates. The effect of a slurry dipping technique used to coat resorbable Vicryl (polyglactin 910) and non-resorbable Mersilk surgical sutures with AgBG was investigated using conventional differential scanning calorimetry (DSC), high speed calorimetry (or HYPERDSC), and modulated temperature DSC (MTDSC). These methods were compared in terms of their ability to resolve the thermal transitions of the types of suture materials. Differential thermal analysis (DTA) and thermogravimetric analysis (TGA) were used to verify the thermal degradation temperatures of these materials and to quantify the AgBG coatings on the sutures. The use of complementary thermal analysis techniques enabled the understanding of the effect of the AgBG coating technique on the morphological properties of the sutures. The slurry dipping technique had no significant effect on the thermal transitions of both types of materials. The use of high speed calorimetry through DSC offered better resolution for the transitions that appeared to be weak through conventional heating regimes, and was able to separate broad double transitions. Furthermore, it was shown not to compromise either the melting temperature or the enthalpy of melting. Therefore this method allows for the accurate determination of thermal transitions through much shorter experimental times thus allowing for an increased sample throughput. The combined DTA and TGA indicated that a greater AgBG coating was obtained in the case of the Mersilk sutures. PMID:15972365

Blaker, Jonny J; Boccaccini, Aldo R; Nazhat, Showan N

2005-07-01

300

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

PubMed

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

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

2014-10-01

301

Suture zones of the Urals as integral prospective ore-bearing tectonic structures  

NASA Astrophysics Data System (ADS)

Rift-related (1.2 Ga) and collision (380-240 Ma) suture zones of the Urals are described. The riftrelated suture zones comprise an ultramafic-gabbro complex with titanomagnetite mineralization, an ultramafic complex with chromite mineralization, and a complex of alkali granitoids with rare-metal (including REE) mineralization accompanied by K-feldspathites, albitites, and calcite metasomatic rocks. The collision suture zones are distinguished by early collision granitoids specialized for tungsten (scheelite) and gold, as well as by raremetal granites and such derivatives of them as pegmatite and greisen with rare-metal and colored-stone mineralization. The suture zones are characterized by long-term (up to 80 Ma or more) continuous-discontinuous periods of ore deposition; heterogeneous sources of ore matter and ore-bearing fluids; a polyelemental composition of lithogeochemical halos and an integral mineral composition of altered wall rocks; and the occurrence of mafic, intermediate, and felsic dikes at large gold deposits, as well as wide variations in PT parameters of the ore-forming process: T = 620-150°C and P = 3.2-0.6 kbar. Collision played a dual role in ore formation. On the one hand, collision led to deformation and metamorphism of precollision massive sulfide deposits and, to a lesser degree, Au-bearing Fe and Cu skarn and porphyry copper deposits, and, on the other hand, to the formation of new gold, rare-metal, quartz, colored-stone, talc, muscovite, and noble serpentine deposits. As a rule, this polygenetic mineralization differs in age and is related to collision volcanic and plutonic complexes. This diversity can be a good basis for metallogenic analysis, forecasting, and prospecting of various metallic deposits and industrial minerals. Polygenetic mineralization of various age known in suture zones is accompanied by integral lithogeochemical and metasomatic halos characterized by a continuous-discontinuous history. The complexity of ore mineralization and often nonlinear metallogeny increase the practical value of suture zones.

Koroteev, V. A.; Sazonov, V. N.; Ogorodnikov, V. N.; Polenov, Yu. A.

2009-04-01

302

Objective assessment of laparoscopic suturing skills using a motion-tracking system  

Microsoft Academic Search

Background  Laparoscopic suturing skills are important for advanced laparoscopic surgery. However, objective assessment of these skills\\u000a has not yet been established. The aim of this study was to assess the laparoscopic suturing skills of novice and experienced\\u000a surgeons using an electromagnetic motion-tracking system.\\u000a \\u000a \\u000a \\u000a \\u000a Methods  A total of 18 surgeons, who were all right-handed, were divided into the following two groups according to

Shohei Yamaguchi; Daisuke Yoshida; Hajime Kenmotsu; Takefumi Yasunaga; Kozo Konishi; Satoshi Ieiri; Hideaki Nakashima; Kazuo Tanoue; Makoto Hashizume

2011-01-01

303

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

PubMed

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; ?enay, ?ahin; Ümit Güllü, A; Alhan, Cem

2013-09-01

304

21 CFR 74.3045 - [Phthalocyaninato(2-)] copper.  

...monofilament sutures for general and ophthalmic surgery, nonabsorbable sutures made from poly(vinylidene fluoride) and poly(vinylidene fluoride-co-hexafluoropropylene) for general and ophthalmic surgery, and polymethylmethacrylate...

2014-04-01

305

Structure of the crust in the vicinity of the Banggong-Nujiang suture in central Tibet from INDEPTH magnetotelluric data  

E-print Network

Structure of the crust in the vicinity of the Banggong-Nujiang suture in central Tibet from INDEPTH data from a 150-km-long profile crossing the Banggong-Nujiang suture (BNS), central Tibet, acquired as part of the International Deep Profiling of Tibet and the Himalaya (INDEPTH) project, have been

Kidd, William S. F.

306

The Yarlung Zangbo Suture Zone Ophiolites, Tibet: A Synthesis  

NASA Astrophysics Data System (ADS)

This paper presents the main results of a research project focused on the Yarlung Zangbo Suture Zone (YZSZ) ophiolites and related mélanges and flysch. Study area is representing a 300 km long and 30 km wide segment. The Cretaceous ophiolites are remnants of Neo-Tethys basin which was almost totally consumed in a northward oriented subduction zone and southerly transported onto the Indian plate colliding with Eurasia circa 50 Ma ago. The ophiolite massifs rest on an ophiolitic mélange, containing locally 124-127 Ma garnet- bearing and garnet-free foliated amphibolites. These amphibolites experienced high-temperature and relatively high pressure suggesting they were generated because of initiation of an intraoceanic subduction zone. Further south a Triasic flysch and a Cretaceous mélange contain igneous blocks derived from partial reworking of Indian passive margin and Tethyan ocean-floor. The amphibolites show arc tholeiitic affinities such La/Sm 0.8 and negative Ta and Nb anomalies and are geochemically similar to the ophiolitic mafic units. The mafic blocks found in the flysch and mélange zones are of intra-continental and intra-oceanic geochemical affinities respectively. The ophiolites are made of cpx-harzburgitic mantle and thin gabbro-lacking crust. Mantle harzburgites are subdivided into two groups. Samples from the western massifs are characterized by porphyroclastic textures, aluminous spinels (Cr/(Cr+Al) : 0.13-0.21), low average TiO2 content (0.04 wt.%), depleted REE patterns (average La/Sm ratios 0.4) and derive from 7-12 % melting of N-MORB-like source. Samples from the eastern massifs are granular peridotites with Cr-rich spinels (Cr/(Cr+Al) : 0.33-0.74), very low average TiO2 content (0.008 wt. %), enriched REE patterns (average La/Sm 5.6) and could originate from 20-30 % partial melting of a depleted source further enriched by an episode of metasomatism. Crustal samples are mainly basaltic flows, diabasic and rare gabbroic intrusions. They are subdivided into two groups. The western group is made of pl-cpx-phyric arc tholeiites with depleted REE patterns (average La/Sm 0.6) and slight Ta-Nb negative anomalies. The eastern group is made up of pl-cpx-(am)-phyric arc tholeiites having fractionated REE patterns (average La/Sm 4.6) and strong Ta-Nb negative anomalies. Boninitic component increases towards the east and is prominent in Luobusa area. These results are consistent with derivation of the ophiolites from dismemberment of back-arc (western portion) and intra-oceanic arc (eastern portion) sectors of the Neo-Tethys marginal basin.

Hebert, R.; Guilmette, C.; Dupuis, C.; Dubois-Cote, V.; Huot, F.; Dostal, J.; Wang, C.; Li, Y.

2006-12-01

307

Multiband Metamaterial Absorber at Terahertz Frequencies  

NASA Astrophysics Data System (ADS)

We propose a multi-band metamaterial absorber operating at terahertz frequencies. The design, characterization, and theoretical calculation of the high performance metamaterial absorber are reported. The multi-band metamaterial absorber consists of two metallic layers separated by a dielectric spacer. Theoretical and simulated results show that the metamaterial absorber has four distinct absorption points at frequencies 0.57 THz, 1.03 THz, 1.44 THz and 1.89 THz, with the absorption rates of 99.9%, 90.3%, 83.0%, 96.1%, respectively. Two single band metamaterial absorbers and a dual band metamaterial absorber on the top layer are designed. Some multi-band absorbers can be designed by virtue of combining some single band absorbers. The multiple-reflection theory is used to explain the absorption mechanism of our investigated structures.

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

2014-05-01

308

Scattered and absorbed powers in receiving antennas  

Microsoft Academic Search

This paper discusses the amount of power, which is scattered and absorbed by a receiving antenna and in particular, whether an antenna can absorb the entire power incident upon it. The absorbed and scattered power from dipole arrays in either free space, or over ground plane is considered. By defining a suitable \\

David Pozar

2004-01-01

309

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

2009-09-01

310

Synchrotron radiation absorber for high density loads  

NASA Astrophysics Data System (ADS)

A design of a special synchrotron radiation absorber for the storage ring VEPP-4M is presented. The density of the synchrotron radiation power on the absorber surface is up to 500 W/mm 2. The absorber is made from a beryllium plate, brazed inside to the copper vacuum chamber, which is intensively water-cooled from outside.

Anashin, V. V.; Kuzminych, V. S.; Trakhtenberg, E. M.; Zholents, A. A.

1991-10-01

311

Adaptive radar absorbing structures with active FSS  

Microsoft Academic Search

A brief description of the theory of passive and active absorbers is presented followed by details of an experimental study into a new design of adaptive absorber. The absorber is a single-layer planar structure based upon the topology of a Salisbury screen, but in which the conventional resistive layer is replaced by an active frequency selective surface (FSS) controlled by

Alan Tennant; Barry Chambers

2002-01-01

312

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

1986-01-01

313

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

2003-01-01

314

Optimization of ramified absorber networks doing desalination  

Microsoft Academic Search

An iterated function system is used to generate fractal-like ramified graph networks of absorbers, which are optimized for desalination performance. The diffusion equation is solved for the boundary case of constant pressure difference at the absorbers and a constant ambient salt concentration far from the absorbers, while constraining both the total length of the network and the total area of

Martin S. Singleton; Gregor Heiss; Alfred Hübler

2011-01-01

315

Usefulness of Irradiated Polyglactin 910 (Vicryl Rapide) for Skin Suturing during Surgery for Lateral Ray Polydactyly of the Toes in Children  

PubMed Central

Background: This study describes the use of a bioabsorbable suture for skin suturing during surgery for lateral ray polydactyly followed by favorable postoperative outcome without the need for postoperative suture removal. Methods: A 5-0 Vicryl Rapide suture was used for skin suturing during surgery for lateral ray polydactyly in 9 children (mean age, 12.4 mo). Children were allowed to walk and bathe 2 weeks after surgery when over-the-suture taping therapy was started. Results: In all cases, the Vicryl Rapide suture disappeared completely within 3 weeks of surgery, and no removal of residual suture was required. No postoperative complications, such as suture abscess, wound dehiscence, or ulcer, were observed. During a mean 24-month postoperative follow-up, no elevation of the interdigital space due to hypertrophic scarring or scar contracture was observed, and no revision surgery was required. Conclusions: Although the breaking strength of Vicryl Rapide declines within the first 10 days after surgery, this property will unlikely lead to postoperative wound dehiscence due to a relatively light load being applied to the lateral toes. The use of a bioabsorbable suture for skin suturing during surgery for lateral lay polydactyly is highly beneficial as it eliminates pain caused by suture removal and the risk of tissue damage while reducing the burden on medical staff. PMID:25289236

Takeuchi, Masaki

2013-01-01

316

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

E-print Network

), Bresch D (8), Corre P (2), Ohazama A (1), Sharpe PT (1), Calvez V (4) 1. Stem Cell Biology and Craniofacial Development, Dental Institute, King's College London, London, United-Kingdom 2. Service de]. Nevertheless, the way external mechanical information is transmitted to cells inside the sutures is far from

Paris-Sud XI, Université de

317

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

E-print Network

embryonic/ early fetal development (Chase, 1942). The ``overgrowth theory'' holds that the maxillary bone completely covers the Pmx on the facial surface between 12 and 16 weeks of fetal development (Ashley of a suture between fetal premaxillary and maxillary bones. Two major theories have been advanced

Dumont, Elizabeth R.

318

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

2009-01-01

319

Skin staples: a safe technique for securing mesh in lichtensteins hernioplasty as compared to suture.  

PubMed

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

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

2014-01-01

320

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

PubMed Central

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

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

2014-01-01

321

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

Microsoft Academic Search

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

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

2001-01-01

322

The suturing concept for laparoscopic mesh fixation in ventral and incisional hernias: Preliminary results  

Microsoft Academic Search

Having found existing techniques for treatment of incisional hernias unsatisfactory, we developed a new laparoscopic approach with a Parietex Composite mesh. This study shows the preliminary results in order to analyze the validity of the concept on efficacy and safety. Three trocars are needed for this procedure. Non-reabsorbable sutures are mandatory for closure of large defects to avoid having to

E. Chelala; F. Gaede; V. Douillez; M. Dessily; J. L. Alle

2003-01-01

323

Postoperative Pain After Laparoscopic Ventral Hernia Repair: a Prospective Comparison of Sutures Versus Tacks  

PubMed Central

Background and Objectives: Mesh fixation in laparoscopic ventral hernia repair typically involves the use of tacks, transabdominal permanent sutures, or both of these. We compared postoperative pain after repair with either of these 2 methods. Methods: Patients undergoing laparoscopic ventral hernia repair at the Mount Sinai Medical Center were prospectively enrolled in the study. They were sorted into 2 groups (1) those undergoing hernia repairs consisting primarily of transabdominal suture fixation and (2) those undergoing hernia repairs consisting primarily of tack fixation. The patients were not randomized. The technique of surgical repair was based on surgeon preference. A telephone survey was used to follow-up at 1 week, 1 month, and 2 months postoperatively. Results: From 2004 through 2005, 50 patients were enrolled in the study. Twenty-nine had hernia repair primarily with transabdominal sutures, and 21 had repair primarily with tacks. Both groups had similar average age, BMI, hernia defect size, operative time, and postoperative length of stay. Pain scores at 1 week, 1 month, and 2 months were similar. Both groups also had similar times to return to work and need for narcotic pain medication. Conclusions: Patients undergoing laparoscopic ventral hernia repair with primarily transabdominal sutures or tacks experience similar postoperative pain. The choice of either of these fixation methods during surgery should not be based on risk of postoperative pain. PMID:18435881

Nguyen, Scott Q.; Buch, Kerri E.; Schnur, Jessica; Weber, Kaare J.; Katz, L. Brian; Reiner, Mark A.; Aldoroty, Robert A.; Herron, Daniel M.

2008-01-01

324

Intracranial pressure monitoring in children with single suture and complex craniosynostosis: a review  

Microsoft Academic Search

Introduction: One third of patients with craniofacial dysostosis syndromes and about 15-20% of children with single suture cranioste- nosis have a documented increase in intracranial pressure (ICP). The early detection of intracranial hypertension is important in orderto reduce the risks for brain development and visual function. However, in children with craniosynostosis, the clinical manifes- tations of abnormally increased ICP aredifficulttodetect,asthemajorityof

G. Tamburrini; M. Caldarelli; L. Massimi; P. Santini; C. Di Rocco

2005-01-01

325

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

PubMed Central

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

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

2014-01-01

326

The Double Absorbing Boundary method  

NASA Astrophysics Data System (ADS)

A new approach is devised for solving wave problems in unbounded domains. It has common features to each of two types of existing techniques: local high-order Absorbing Boundary Conditions (ABC) and Perfectly Matched Layers (PML). However, it is different from both and enjoys relative advantages with respect to both. The new method, called the Double Absorbing Boundary (DAB) method, is based on truncating the unbounded domain to produce a finite computational domain ?, and on applying a local high-order ABC on two parallel artificial boundaries, which are a small distance apart, and thus form a thin non-reflecting layer. Auxiliary variables are defined on the two boundaries and inside the layer bounded by them, and participate in the numerical scheme. The DAB method is first introduced in general terms, using the 2D scalar time-dependent wave equation as a model. Then it is applied to the 1D Klein-Gordon equation, using finite difference discretization in space and time, and to the 2D wave equation in a wave guide, using finite element discretization in space and dissipative time stepping. The computational aspects of the method are discussed, and numerical experiments demonstrate its performance.

Hagstrom, Thomas; Givoli, Dan; Rabinovich, Daniel; Bielak, Jacobo

2014-02-01

327

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

1981-02-01

328

Complications after subpectoral biceps tenodesis using a dual suture anchor technique  

PubMed Central

Purpose: A variety of fixation techniques for subpectoral biceps tenodeses have been described including interference screw and suture anchor fixation. Biomechanical data suggests that dual suture anchor fixation has equivalent strength compared to interference screw fixation. The purpose of the study is to determine the early complication rate after subpectoral biceps tenodesis utilizing a dual suture anchor technique. Materials and Methods: A total of 103 open subpectoral biceps tenodeses were performed over a 3-year period using a dual suture anchor technique. There were 72 male and 31 female shoulders. The average age at the time of tenodesis was 45.5 years. 41 patients had a minimum of 6 months clinical follow-up (range, 6 to 45 months). The tenodesis was performed for biceps tendonitis, superior labral tears, biceps tendon subluxation, biceps tendon partial tears, and revisions of prior tenodeses. Results: There were a total of 7 complications (7%) in the entire group. There were 4 superficial wound infections (4%). There were 2 temporary nerve palsies (2%) resulting from the interscalene block. One patient had persistent numbness of the ear and a second patient had a temporary phrenic nerve palsy resulting in respiratory dysfunction and hospital admission. One patient developed a pulmonary embolism requiring hospital admission and anticoagulation. There were no hematomas, wound dehiscences, peripheral nerve injuries, or ruptures. In the sub-group of patients with a minimum of 6 months clinical follow-up, the only complication was a single wound infection treated with oral antibiotics. Conclusions: Subpectoral biceps tenodesis utilizing a dual suture anchor technique has a low early complication rate with no ruptures or deep infections. The complication rate is comparable to those previously reported for interference screw subpectoral tenodesis and should be considered as a reasonable alternative to interference screw fixation. Level of Evidence: Level IV-Retrospective Case Series PMID:25114415

Abtahi, Amir M.; Granger, Erin K.; Tashjian, Robert Z.

2014-01-01

329

Brief communication: Testing the usefulness of the basilar suture as a means to determine age in great ape skeletons.  

PubMed

A fused/closed basilar suture is usually treated as an indication of old age in great apes. A sample, drawn from a variety of sources, of known-aged captive great ape skeletons was analyzed to test the usefulness of using the basilar suture to categorize adult skeletons as either "adult" or "old adult". The state of closure of the basilar suture was examined in 30 chimpanzees, 19 gorillas, and 15 orangutans, all of known age. The results show that the basilar suture demonstrates a high level of uniformity in rate of closure and is closed at an early age in virtually all known-aged individuals. Thus, an old adult category most likely includes individuals who are, in fact, relatively young. This indicates that using the basilar suture as a means to classify individual skeletons as adult or old adult is very imprecise. The homogenous nature of basilar suture closure appears to prevent meaningful application of suture status for categorizing adult ape skeletons by age groups. PMID:20979206

Poe, Demelza J

2011-01-01

330

In vitro attachment of Staphylococcus epidermidis to surgical sutures with and without Ag-containing bioactive glass coating.  

PubMed

The ability of a silver-doped bioactive glass (AgBG) coating to prevent bacterial colonization on surgical sutures was investigated in vitro. Bioactive glass powders, in the form of 45S5 Bioglass and AgBG, were used to coat Mersilk sutures using an optimized 'in house' slurry-dipping process. In vitro experiments were carried out using Staphylococcus epidermidis under both batch and flow conditions. While the traditional batch culture testing was used to determine the number of viable cells adhered to the surface, the flow-cell was used to visualize attachment and detachment over time. Under batch conditions of up to 180 min, statistically significant differences were observed in the colony forming units (CFU) per suture for both the coated and uncoated Mersilk sutures. The results showed that the AgBG coating had the greatest effect on limiting bacterial attachment (8 x 10(2) CFU) when compared to the 45S5 Bioglass coating (3.2 x 10(3) CFU) and the uncoated Mersilk (1.2 x 10(4) CFU). Also under flow conditions differences were seen between the coated and uncoated sutures. Therefore, this preliminary study has demonstrated the quantification and visualization of bacterial attachment onto sutures in order to compare the antibacterial properties of Ag-containing bioactive glass coatings. The bactericidal properties imparted by Ag-containing glass open new opportunities for use of the composite sutures in wound healing and body wall repair. PMID:15245643

Pratten, Jonathan; Nazhat, Showan N; Blaker, Jonny J; Boccaccini, Aldo R

2004-07-01

331

Fishing line suture: cost-saving alternative for atraumatic intracutaneous skin closure--randomized clinical trial in Rwanda.  

PubMed

Experience with the use of nylon fishing line for surgical sutures has been reported from several African countries. A recent publication suggested that fishing line and an injection needle may provide an atraumatic suture that is especially suitable for intracutaneous skin closures. This article provides further empirical support for such alternative technology. We describe a randomized, blinded clinical trial conducted in Butare (Rwanda) with 220 cutaneous wounds closed by intracutaneous sutures, with either the homemade suture or a commercial nylon thread (Ethilon). We compared the clinical outcomes as well as the costs of those two materials. There are no significant differences between the two sutures in terms of clinical findings or in the reported ease of use by the surgeons. The cost of a homemade atraumatic suture is US $0.07, which is less than one-thirtieth the cost of the commercial thread. The advantage of the commercial thread is the assurance of quality. We consider whether this quality assurance justifies the large price difference, and if the homemade suture should be recommended to surgeons in countries where the costs of surgical material often remain an obstacle for life-saving operations. PMID:15022020

Freudenberg, Sebastian; Nyonde, Martin; Mkony, Charles; Bay, Fatma; Wilhelm, Torsten; Post, Stefan

2004-04-01

332

Liquid crystal tunable metamaterial absorber.  

PubMed

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

2013-04-26

333

Modeling the Absorbing Aerosol Index  

NASA Technical Reports Server (NTRS)

We propose a scheme to model the absorbing aerosol index and improve the biomass carbon inventories by optimizing the difference between TOMS aerosol index (AI) and modeled AI with an inverse model. Two absorbing aerosol types are considered, including biomass carbon and mineral dust. A priori biomass carbon source was generated by Liousse et al [1996]. Mineral dust emission is parameterized according to surface wind and soil moisture using the method developed by Ginoux [2000]. In this initial study, the coupled CCM1 and GRANTOUR model was used to determine the aerosol spatial and temporal distribution. With modeled aerosol concentrations and optical properties, we calculate the radiance at the top of the atmosphere at 340 nm and 380 nm with a radiative transfer model. The contrast of radiance at these two wavelengths will be used to calculate AI. Then we compare the modeled AI with TOMS AI. This paper reports our initial modeling for AI and its comparison with TOMS Nimbus 7 AI. For our follow-on project we will model the global AI with aerosol spatial and temporal distribution recomputed from the IMPACT model and DAO GEOS-1 meteorology fields. Then we will build an inverse model, which applies a Bayesian inverse technique to optimize the agreement of between model and observational data. The inverse model will tune the biomass burning source strength to reduce the difference between modelled AI and TOMS AI. Further simulations with a posteriori biomass carbon sources from the inverse model will be carried out. Results will be compared to available observations such as surface concentration and aerosol optical depth.

Penner, Joyce; Zhang, Sophia

2003-01-01

334

Impingement syndrome of the shoulder following double row suture anchor technique for arthroscopic rotator cuff repair: a case report  

PubMed Central

Introduction Arthroscopic repair of the rotator cuff is a demanding surgery. Accurate placement of anchors is key to success. Case presentation A 38-year-old woman received arthroscopic repair of her rotator cuff using a double row suture anchor technique. Postoperatively, she developed impingement syndrome which resulted from vertical displacement of a suture anchor once the shoulder was mobilised. The anchor was removed eight weeks following initial surgery and the patient had an uneventful recovery. Conclusion Impingement syndrome following arthroscopic repair of the rotator cuffs using double row suture anchor has not been widely reported. This is the first such case where anchoring has resulted in impingement syndrome. PMID:19830217

2009-01-01

335

An unusual complication of Mitek suture anchor use in primary treatment of flexor digitorum profundus tendon laceration: a case report  

PubMed Central

Introduction A case of an osteolysis by Mitek anchor-suture is presented. Case presentation A case of index finger's flexor digitorum profundus tendon primary reconstruction with the use of Mitek anchor is presented here. Within a 14 month period, Mitek suture anchor caused local foreign body reaction with osteolysis and ulceration of the palmar skin of the finger while on the other hand tendon's healing was successfully completed. Conclusion Mitek anchor-sutures can cause an aseptic inflammatory reaction which represents a typical biologic response to a foreign body. Concomitant osteolysis can drive to loosening and migration of the implant. PMID:20062642

2009-01-01

336

Controlling Nanoparticle Aggregation in Colloidal Microwave Absorbers via Interface Chemistry  

E-print Network

Microwave absorbing materials for military applications have been investigated since the advent of radar systems. The majority of these systems, including Salisbury screens, Jaumann absorbers, radar absorbing absorber that utilizes ferromagnetic particles in combination with a dielectric matrix material offers

Stowell, Michael

337

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

USGS Publications Warehouse

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

Williams, Jackie M.; Rodriguez, Brian D.

2006-01-01

338

Initial fixation and cyclic loading stability of knotless suture anchors for rotator cuff repair.  

PubMed

This study evaluated the resistance to gapping and the mode of failure for 2 knotless suture anchor systems used for rotator cuff repair compared with the performance of a conventional titanium anchor system. Eight matched pairs of fresh-frozen humeri were dissected free of all soft tissues and scanned to measure bone mineral density (BMD). The suture anchor systems tested were the TwinFix 5.0 Titanium (Smith & Nephew, Andover, MA), Bioknotless RC (DePuy Mitek, Norwood, MA), and Magnum (Opus Medical, San Juan Capistrano, CA), and each was inserted into each humerus. Cyclic, tensile loading was applied through the suture loop for 5000 cycles, or until failure, by using a servohydraulic testing machine. Gapping distances, defined as increasing elongation of the bone/anchor/suture system, were continuously measured. Total cycles to failure and mechanism of failure were documented. Mean initial (first cycle) and final (last cycle) gapping distances were 3.81 mm and 5.36 mm for the TwinFix 5.0, 4.02 mm and 5.34 mm for the Bioknotless RC, and 3.56 mm and 4.98 mm for the Magnum anchors. No significant difference was detected among mean gap openings (P > .05). However, the Bioknotless RC had more early failures (5) than the other 2 implants (1 each), approaching significance (P = .07). Trials of the Bioknotless RC that did not fail early were found to have significantly less gap opening than the other 2 systems for both initial (1.89 mm vs 3.82 mm for the TwinFix 5.0 and 3.56 mm for the Magnum) and final (2.00 mm vs 4.68 mm for the TwinFix 5.0 and 4.24 mm for the Magnum) gap opening. BMD was a significant predictor of initial (P = .029) and final (P = .008) gap opening, whereas the site of anchor insertion was a significant predictor of final displacement. The Opus Magnum was comparable with a conventional suture anchor, but the Mitek Bioknotless RC showed a trend toward early failure. Biomechanical analysis of knotless suture anchor systems can demonstrate trends among implants in an experimental setting. Knowledge of these trends could influence implant selection. PMID:18036851

Brown, Barrett S; Cooper, Andrew D; McIff, Terence E; Key, Vincent H; Toby, E Bruce

2008-01-01

339

Electromagnetic scattering by pyramidal and wedge absorber  

NASA Technical Reports Server (NTRS)

Electromagnetic scattering from pyramidal and wedge absorbers used to line the walls of modern anechoic chambers is measured and compared with theoretically predicted values. The theoretical performance for various angles of incidence is studied. It is shown that a pyramidal absorber scatters electromagnetic energy more as a random rough surface does. The apparent reflection coefficient from an absorber wall illuminated by a plane wave can be much less than the normal absorber specifications quoted by the manufacturer. For angles near grazing incidence, pyramidal absorbers give a large backscattered field from the pyramid side-faces or edges. The wedge absorber was found to give small backscattered fields for near-grazing incidence. Based on this study, some new guidelines for the design of anechoic chambers are advocated because the specular scattering models used at present do not appear valid for pyramids that are large compared to the wavelength.

Dewitt, Brian T.; Burnside, Walter D.

1988-01-01

340

An omnidirectional electromagnetic absorber made of metamaterials  

NASA Astrophysics Data System (ADS)

In a recent theoretical work by Narimanov and Kildishev (2009 Appl. Phys. Lett. 95 041106) an optical omnidirectional light absorber based on metamaterials was proposed, in which theoretical analysis and numerical simulations showed that all optical waves hitting the absorber are trapped and absorbed. Here we report the first experimental demonstration of an omnidirectional electromagnetic absorber in the microwave frequency. The proposed device is composed of non-resonant and resonant metamaterial structures, which can trap and absorb electromagnetic waves coming from all directions spirally inwards without any reflections due to the local control of electromagnetic fields. It is shown that the absorption rate can reach 99 per cent in the microwave frequency. The all-directional full absorption property makes the device behave like an 'electromagnetic black body', and the wave trapping and absorbing properties simulate, to some extent, an 'electromagnetic black hole.' We expect that such a device could be used as a thermal emitting source and to harvest electromagnetic waves.

Cheng, Qiang; Cui, Tie Jun; Jiang, Wei Xiang; Cai, Ben Geng

2010-06-01

341

Magnetic field effects on microwave absorbing materials  

NASA Technical Reports Server (NTRS)

The objective of this program was to gather information to formulate a microwave absorber that can work in the presence of strong constant direct current (DC) magnetic fields. The program was conducted in four steps. The first step was to investigate the electrical and magnetic properties of magnetic and ferrite microwave absorbers in the presence of strong magnetic fields. This included both experimental measurements and a literature survey of properties that may be applicable to finding an appropriate absorbing material. The second step was to identify those material properties that will produce desirable absorptive properties in the presence of intense magnetic fields and determine the range of magnetic field in which the absorbers remain effective. The third step was to establish ferrite absorber designs that will produce low reflection and adequate absorption in the presence of intense inhomogeneous static magnetic fields. The fourth and final step was to prepare and test samples of such magnetic microwave absorbers if such designs seem practical.

Goldberg, Ira; Hollingsworth, Charles S.; Mckinney, Ted M.

1991-01-01

342

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

2011-02-01

343

Metamaterial Electromagnetic Absorbers and Plasmonic Structures.  

E-print Network

??In this thesis metamaterial radar absorbers and plasmonic structures have been investigated. Following a brief overview covering metamaterial structures, and their applications in various areas… (more)

Noor, Adnan

2010-01-01

344

40Ar– 39Ar dating of volcanic rocks of the Shyok suture zone in north–west trans-Himalaya: Implications for the post-collision evolution of the Shyok suture zone  

Microsoft Academic Search

40Ar–39Ar geochronological studies carried out on the Khardung volcanics of Ladakh, India and our earlier Ar–Ar results from the volcanics of the Shyok suture along with the available geological and geochemical data provide good constraints for post-collision evolution of the Shyok suture zone. Whole-rock samples from the Shyok volcanics yielded disturbed age-spectra and we have demonstrated earlier that the youngest

Rajneesh Bhutani; Kanchan Pande; T. R. Venkatesan

2009-01-01

345

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

PubMed Central

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

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

2013-01-01

346

New and emerging uses of barbed suture technology in plastic surgery.  

PubMed

Barbed sutures first received US Food and Drug Administration approval for soft tissue approximation in 2005 and early adopters readily embraced this device to develop new techniques. It has become apparent that the advantages are more than just "skin deep." Superficial and deep fascia, cartilage, tendon, joint capsule, and fibrous periprosthetic capsules can also be manipulated. Barbed sutures have revolutionized our approach to facial rejuvenation and body contouring by enhancing our ability to quilt and powerfully lift tissue. The elimination of surgical drains and shorter surgical times has made this a true boon for plastic surgeons as well as many other surgical specialists. This article summarizes some of the current and evolving applications of this exciting new tool. PMID:24084885

Rosen, Allen D

2013-09-01

347

Use of a skin adhesive (octyl-2-cyanoacrylate) and the optimum reinforcing combination for suturing wounds.  

PubMed

The adhesion strength of a skin adhesive, octyl-2-cyanoacrylate (Dermabond), was measured under various conditions using porcine skin. The combined use of a skin adhesive and a skin closure tape (n = 5) was significantly stronger than a single application of skin adhesive (n = 5) (p < 0.01). We have tentatively named the wound closure in which a skin adhesive and reinforcement material were combined the Reinforcing Combination Method. To obtain optimum conditions, further studies were done for sequence of application, type of reinforcement material, a number of layers, and width of the suture. The optimum condition for the reinforcement combination was established by applying one layer of skin adhesive over a skin closure tape, over one layer of skin adhesive, with a suture width of 4 cm. This reinforcement combination might be useful in clinical practice. PMID:16298804

Chigira, Miho; Akimoto, Masataka

2005-01-01

348

Suture welding for arthroscopic repair of peripheral triangular fibrocartilage complex tears.  

PubMed

This report presents a method of arthroscopic repair of the peripheral triangular fibrocartilage tears by using ultrasonic suture welding technique, thus avoiding the need for traditional suture knots. This technique eliminates the potential causes of ulnar-sided wrist discomfort especially during the postoperative period. Twenty-three patients (9 women and 14 men; mean age, 35 years; range, 18-52 years) were operated during a 1-year period in 2001 for Palmer grade 1B triangular fibrocartilage complex tear and followed up for 17 months. At the final follow-up, the average wrist arc of motion was as follows: extension, 65 degrees; flexion, 56 degrees; supination, 80 degrees; pronation, 78 degrees; radial deviation, 12 degrees; and ulnar deviation, 25 degrees. Grip strength measured with a dynamometer (Jamar) averaged 81% of the contralateral side at the final evaluation (range, 53%-105%). PMID:17536524

Badia, Alejandro; Khanchandani, Prakash

2007-03-01

349

The suturing concept for laparoscopic mesh fixation in ventral and incisional hernias: preliminary results.  

PubMed

Having found existing techniques for treatment of incisional hernias unsatisfactory, we developed a new laparoscopic approach with a Parietex Composite mesh. This study shows the preliminary results in order to analyze the validity of the concept on efficacy and safety. Three trocars are needed for this procedure. Non-reabsorbable sutures are mandatory for closure of large defects to avoid having to ultimately extrude the mesh. Ten to 12 cardinal stitches are applied on the polyester side of the mesh. The mesh is anchored to the anterior abdominal wall by transabdominal non-reabsorbable sutures without the use of staples or tacks. One hundred twenty patients with ventral and incisional hernias were included in this study. Early and late complications are reported, showing lower rates of morbidity and no mortality. This technique is satisfactory on the technical front, and the results are as good, or better, than in other trials. PMID:12811619

Chelala, E; Gaede, F; Douillez, V; Dessily, M; Alle, J L

2003-12-01

350

Atmur-Delgo suture: A Neoproterozoic oceanic basin extending into the interior of northeast Africa  

NASA Astrophysics Data System (ADS)

Field and remote-sensing data have enabled identification of a previously unrecognized discontinuous belt of ophiolitic nappe remnants in northeastern Sudan. The belt crops out for 200 km in a west southwest to southwest direction from the western margin of the Arabian-Nubian shield into the gneissic terrane previously accepted as part of the Archean to Paleoproterozoic Nile craton. Although highly dismembered and metamorphosed, the belt contains all the components of a Phanerozoic-type ophiolite. The ophiolite belt is interpreted as a suture zone (Atmur-Delgo suture), manifesting collision (˜700 Ma) between a passive-margin terrane in the south with an island-arc terrane in the north, following the consumption of an oceanic basin along a north-dipping subduction zone. Our results indicate that previously recognized crustal provinces in northeastern Africa must be reassessed critically.

Schandelmeier, Heinz; Wipfler, Eckhard; Küster, Dirk; Sultan, Mohamed; Becker, Richard; Stern, Robert J.; Abdelsalam, Mohamed G.

1994-06-01

351

Skewed Frequency Selective Surface Absorber  

NASA Astrophysics Data System (ADS)

In this paper, a skewed Frequency Selective Surface (FSS) absorber based on cross-dipole elements is presented. The proposed FSS design provides good frequency stability for oblique incidences. It provides better absorption rate for 5-GHz WLAN frequency band and allow other communication bands to pass through it. Also, the absorption in the stop-band reduces multipath fading of additional WLAN signals which occurred due to the placement of conducting/reflecting FSS. The FSS design consists of two layers; first layer consists of conducting cross-dipole and second layer consists of resistive cross-dipole placed in-front of the first layer. The periodicity of both elements is same. Asymmetric property is applied to FSS elements by taking a reference of central element. This technique leads to achieve a maximum stability in the stop-band. Simulated results demonstrated that the proposed FSS design has a stable frequency response for 5-GHz frequency band for both horizontal (TE) and vertical (TM) polarizations when the incident wave angle varied from 0 0 to 45 0.

Rafique, Umair; Khan, M. Arif; Afzal, M. Tausif; Malik, Fahad; Qasim, Shahzaib

2012-12-01

352

Device for absorbing mechanical shock  

DOEpatents

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)

1980-01-01

353

Mattress sutures for the modification of end-to-end dunking pancreaticojejunostomy.  

PubMed

Despite the improvement of surgical techniques, the rate of anastomotic failure of pancreaticojejunostomy remains high (30%-50%). Here we describe the use of vertical mattress sutures in the modification of dunking pancreaticojejunal anastomosis. In 7 patients who used this technique, neither anastomotic failure nor any major postsurgical complication developed. This technique is an easy, safe, and promising for the performance of pancreaticojejunostomy. PMID:24103289

Torer, Nurkan; Ezer, Ali; Nursal, Tar?k Zafer

2013-10-01

354

Is the central Piedmont suture a low-angle normal fault  

SciTech Connect

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

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

1991-11-01

355

HP metamorphic belt along the Indus suture zone of NW Himalaya: new discoveries and significance  

Microsoft Academic Search

Two new occurrences of HP rocks have been found in the Indus suture zone on the eastern side of the Nanga Parbat-Haramosh massif: a retrogressed eclogitic assemblage in pyroxenitic boudins within the Ladakh island-arc sequence, and an HP granulitic paragenesis in mafic alternations of High Himalaya banded gneisses. PT estimates on five samples with garnet-clinopyroxene-amphibole-plagioclase-quartz-FeTi oxide-biotite mineral assemblage have respectively

Patrick Le Fort; Stéphane Guillot; Arnaud Pêcher

1997-01-01

356

Sutures versus staples for skin closure in orthopaedic surgery: meta-analysis  

Microsoft Academic Search

Objective To compare the clinical outcomes of staples versus sutures in wound closure after orthopaedic surgery.Design Meta-analysis.Data sources Medline, CINAHL, AMED, Embase, Scopus, and the Cochrane Library databases were searched, in addition to the grey literature, in all languages from 1950 to September 2009. Additional studies were identified from cited references.Selection criteria Two authors independently assessed papers for eligibility. Included

Toby O Smith; Debbie Sexton; Charles Mann; Simon Donell

2010-01-01

357

Tracking the Archean-Proterozoic suture zone in the northeastern Great Basin, Nevada and Utah  

USGS Publications Warehouse

It is important to know whether major mining districts in north-central Nevada are underlain by crust of the Archean Wyoming craton, known to contain major orogenic gold deposits or, alternatively, by accreted crust of the Paleoproterozoic Mojave province. Determining the location and orientation of the Archean-Proterozoic suture zone between these provinces is also important because it may influence subsequent patterns of sedimentation, deformation, magmatism, and hydrothermal activity. The suture zone is exposed in northeastern Utah and south-western Wyoming and exhibits a southwest strike. In the Great Basin, the suture zone strike is poorly constrained because it is largely concealed below a Neoproterozoic-Paleozoic miogeocline and Cenozoic basin fill. Two-dimensional resistivity modeling of three regional north-south magnetotelluric sounding profiles in western Utah, north-central Nevada, and northeastern Nevada, and one east-west profile in northeastern Nevada, reveals a deeply penetrating (>10 km depth), broad (tens of kilometers) conductor (1-20 ohm-meters) that may be the Archean-Proterozoic suture zone, which formed during Early Proterozoic rifting of the continent and subsequent Proterozoic accretion. This major crustal conductor changes strike direction from southwest in Utah to northwest in eastern Nevada, where it broadens to ???100 km width that correlates with early Paleozoic rifting of the continent. Our results suggest that the major gold belts may be over-isolated blocks of Archean crust, so Phanerozoic mineral deposits in this region may be produced, at least in part, from recycled Archean gold. Future mineral exploration to the east may yield large gold tonnages. ?? 2008 Geological Society of America.

Rodriguez, B. D.; Williams, J. M.

2008-01-01

358

The inverted-T mammaplasty: a modified winch suture to reduce horizontal scar length.  

PubMed

Mammaplasty performed with an inverted-T skin resection pattern is a useful technique to treat moderately or severely ptotic breasts. This method of skin resection is conducted via 3 incisional components: periareolar, vertical, and horizontal. In this report, the authors describe a simple modified winch suture that can be inserted with the inverted-T technique to reduce the length of the horizontal incision. PMID:24334501

Raposo-Amaral, Cassio Eduardo; Raposo-Amaral, Cassio Menezes; Marques, Frederico Figueiredo; Denadai, Rafael; Raposo-Amaral, Cesar Augusto

2014-01-01

359

Tibetan basement rocks near Amdo reveal ``missing'' Mesozoic tectonism along the Bangong suture, central Tibet  

Microsoft Academic Search

The U-Pb and 40Ar\\/39Ar studies of a unique exposure of crystalline basement along the Jurassic Early Cretaceous Bangong suture of central Tibet reveal previously unrecognized records of Mesozoic metamorphism, magmatism, and exhumation. The basement includes Cambrian and older orthogneisses that underwent amphibolite facies metamorphism coeval with extensive granitoid emplacement at 185 170 Ma. The basement cooled to ˜300 °C by

Jerome H. Guynn; Paul Kapp; Alex Pullen; Matthew Heizler; George Gehrels; Lin Ding

2006-01-01

360

Improving Nasal Tip Projection and Definition Using Interdomal Sutures and Open Approach Without Transcolumellar Incision  

Microsoft Academic Search

.   The object of this study was to maximally take advantage of the combination of two surgical techniques to manage the nasal\\u000a tip. For this, an approach similar to the open tip approach without a transcolumellar incision was performed and the management\\u000a of the alar cartilages with multiple combined sutures was carried out. This study represents more than two years

Lázaro Cárdenas-Camarena; María Teresa Guerrero

2002-01-01

361

Analysis of the Strength of the Abdominal Fascia in Different Sutures Used in Abdominoplasties  

Microsoft Academic Search

Background  Protrusion of the abdominal wall secondary to abdominoplasty may occur in patients with weakness of the aponeurotic structures.\\u000a The anterior layer of the rectus abdominis muscle consists of fibers that are transverse rather than vertical. Based on this\\u000a anatomical feature, vertical sutures are suggested for the correction of diastasis recti, since they include a greater amount\\u000a of fascial fibers and

Luis Henrique Ishida; Rolf Gemperli; Marco Vinicius Losso Longo; Helio Ricardo Nogueira Alves; Pedro Henrique Quintino da Silva; Luis Carlos Ishida; Marcus Castro Ferreira

362

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

Microsoft Academic Search

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

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

2009-01-01

363

[Scapho-lunate ligament reconstruction with Mitek suture anchors. Initial clinical results].  

PubMed

The scapholunate dissociation is an often misjudged lesion of carpal ligaments as clinical and radiological signs often don't allow a clear interpretation. Apart from chronical courses with increasing arthrosis the consequences are limited and more difficult operations. The application of Mitek suture anchors is a new and simple supplement to large-scale operative reconstructions of ligaments or partial arthrodesis. Of nine reconstructions of the scapholunate interosseous ligament using this anchor method so far only one relaps occurred. PMID:11471405

Wilhelm, K; Kettler, M; Strassmair, M

2001-02-01

364

Perineal hernia repair with acellular dermal graft and suture anchor fixation.  

PubMed

Perineal hernia is an infrequent complication of abdominoperineal resection, but can be problematic. Multiple surgical approaches to the repair of perineal hernia have been described, including abdominal, perineal, and combined methods; most feature the use of a prosthetic mesh. We report a case wherein a large perineal hernia was reduced via an abdominal approach, and then repaired by the placement of an acellular dermal graft (DermaMatrix) fixated anteriorly directly to the pubis with Mitek suture anchors. PMID:20490587

Kathju, S; Lasko, L-A; Medich, D S

2011-06-01

365

Comparison of the Topical Haemostatic Agents for the Prevention of Suture Hole Bleeding. An Experimental Study  

Microsoft Academic Search

Objective: using a rabbit vascular graft model we investigated the use of fibrin glue (FG), gelatin-resorcinol-formaldehyde (GRF), and collagen (C) as a means of reducing suture hole bleeding.Materials and methods: twenty-eight rabbits were divided into four groups: fibrin glue, gelatin-resorcinol-formaldehyde, collagen and control. A 1cm incision was made in the abdominal aortic wall of each animal. Incisions were covered with

Y. Ünlü; Ü. Vural; H. Koçak; M. Ceviz; N. Becit; Ö. Akbulut

2002-01-01

366

Anterior chest wall elevation using a T-fastener suture technique during a Nuss procedure.  

PubMed

The most critical part of the Nuss procedure is the passage of the introducer across the anterior mediastinum without cardiac injury. For patients with severe pectus excavatum, passing the introducer can be difficult and hazardous. We describe a technique that resembles a use of T-fastenerlike suture material to elevate the anterior chest. The elevation of the chest allows safe, blunt anterior mediastinal dissection before the passage of the introducer. The risk of intraoperative cardiac perforation is minimized. PMID:25087810

Kim, Daabin; Idowu, Olajire; Palmer, Barnard; Kim, Sunghoon

2014-08-01

367

Rheological control on the tectonic evolution of a continental suture zone: the Variscan example from NW Iberia (Spain)  

NASA Astrophysics Data System (ADS)

The Variscan continental suture zone exposed in NW Iberia is examined to uncover the long-lived rheological control exerted by the strata deposited over the external parts of Gondwana on its geodynamic evolution. The suture occurs within a set of allochthonous terranes whose limits were taken as domain boundaries to interpret the Variscan stacking of Paleozoic continental domains and retrodeform the resulting nappe pile. The suture zone formed due to closure of ocean basins located between Gondwana and Laurussia during the Late Paleozoic and consists of relics of oceanic and transitional crust. The suture zone exhibits a tabular to lens shape due to repeated tectonic events dominated by non-coaxial deformation (thrusts and low-angle normal faults). Thrusting and normal faulting also involved the margins of the continents bounding the suture. The structure of the continental blocks, however, is dominated by folds, particularly large nappe folds with pronounced superimposed flattening. The upper part of the basal allochthonous units comprises a rheologically incompetent domain below the suture zone. This domain is typified by the carbonaceous-rich strata, which are probably Ordovician-Silurian sediments based on U-Pb detrital zircon populations. The rheology of this layer determined the location of the first accretionary thrust that initiated the Late Devonian subduction of the Gondwana margin below the suture zone. By favoring fault development, the upper sequence of the basal allochthonous units as a whole influenced the exhumation of deep-seated continental crust, the transference of the suture zone over Gondwana, and the re-equilibration of the resulting overthickened crust.

Díez Fernández, Rubén; Foster, David A.; Gómez Barreiro, Juan; Alonso-García, Montserrat

2013-07-01

368

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

Microsoft Academic Search

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

Kenan Akbayram; Aral Okay; Muharrem Satir

2010-01-01

369

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

PubMed Central

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

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

2014-01-01

370

Scanning electron microscopic study of the hydrolytic degradation of poly(glycolic acid) suture  

SciTech Connect

This article reports the morphological observations on the surface changes of poly-(glycolic acid) sutures which have been exposed to various dosages of gamma irradiation (0, 2.5, 5.0, 10, 20 and 40 Mrad) and duration of immersion (0, 7, 14, 28, 48, 60, and 90 days) in a physiological saline buffer. The most important gross morphological characteristics of PGA suture hydrolytic degradation is the formation of surface cracks on the filaments. The regularity of the surface cracks increased with an increase in the gamma irradiation and the duration of hydrolysis. Surface cracks were not observed in irradiated sutures that had not been subjected to hydrolytic degradation. The arrangement of the surface cracks, their orientation on the filaments, and the direction of crack propagation provide very useful information for depicting the mechanism of hydrolytic degradation in this class of fibrous material. The microfibrillar model of fiber structure has been used as the basis for the proposed degradation mechanism of PGA in vitro. It is believed that hydrolysis occurs initially in the amorphous regions sandwiched between two crystalline zones, as tie-chain segments, free chain ends, and chain folds in these regions degrade into fragments. As degradation proceeds, the size of the fragments reaches the stage at which they can be dissolved into the buffer medium. This dissolution removes the fragments from the amorphous regions, and surface cracks appeared.

Chu, C.C.; Campbell, N.D.

1982-07-01

371

Microvascular anastomoses in irradiated vessels: A comparison between the Unilink system and sutures  

SciTech Connect

A new mechanical device (the Unilink system) was compared to conventional suture anastomoses in irradiated microvessels. Twenty rabbits received a single radiation dose of 20 Gy from a 7-MeV electron source through an anterior neck field. One and 6 months following irradiation, the carotid arteries and facial veins were divided and anastomosed on one side with the Unilink system and on the other side with suture technique. At sacrifice 4 weeks postoperatively, all vessels were evaluated for patency and histologic changes associated with radiation and anastomotic trauma. Histology disclosed severe radiation changes. Also, intimal hyperplasia was consistently found at the anastomotic sites in the arteries, while it was totally absent in the venous anastomoses. Occlusive thrombosis was found in two arteries, one anastomosed with the Unilink system and one sutured. Two other arteries, one from each group, had subtotal occlusions at the anastomotic site. No occlusions occurred in any of the venous anastomoses. The overall patency in this study was 97.5 percent, with no difference between the two techniques.

Ragnarsson, R.; Berggren, A.; Klintenberg, C.; Ostrup, L. (University Hospital, Linkoeping (Sweden))

1990-03-01

372

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

USGS Publications Warehouse

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

Johnson, P.R.; Kattan, F.

2001-01-01

373

Tissue engineering of a genitourinary tubular tissue graft resistant to suturing and high internal pressures.  

PubMed

The aim of this study was to evaluate the possibility of constructing a fully autologous tissue-engineered tubular genitourinary graft (TTGG) and to determine its mechanical and physiological properties. Dermal fibroblasts (DFs) were expanded and cultured in vitro with sodium ascorbate to form fibroblast sheets. The sheets were then wrapped around a tubular support to form a cylinder. After maturation, urothelial cells (UCs) were seeded inside the DF tubes, and the constructs were placed in a bioreactor. The TTGGs were then characterized according to histology, immuno-histochemistry, Western blot, cell viability, resistance to suture, and burst pressure. Results obtained were encouraging on all levels. All layers of the TTGGs had merged, and a pluristratified urothelium coated the luminal surface of the tubes. The burst pressure of non-sutured TTGGs was measured and found to be, on average, three times as resistant as that of porcine urethras. Suturing was accomplished without difficulty. Results have shown that our construct can sustain an entire week of pulsatile stimulation without loss of mechanical or histological integrity. The tissue-engineering technique used to produce this model seems promising for bioengineering a urethra or ureter graft and could open a doorway to new possibilities for their reconstruction. PMID:18759664

Magnan, Martine; Lévesque, Philippe; Gauvin, Robert; Dubé, Jean; Barrieras, Diego; El-Hakim, Assaad; Bolduc, Stéphane

2009-01-01

374

Development of advanced antimicrobial and sterilized plasma polypropylene grafted muga (antheraea assama) silk as suture biomaterial.  

PubMed

Surface modification of silk fibroin (SF) materials using environmentally friendly and non-hazardous process to tailor them for specific application as biomaterials has drawn a great deal of interest in the field of biomedical research. To further explore this area of research, in this report, polypropylene (PP) grafted muga (Antheraea assama) SF (PP-AASF) suture is developed using plasma treatment and plasma graft polymerization process. For this purpose, AASF is first sterilized in argon (Ar) plasma treatment followed by grafting PP onto its surface. AASF is a non-mulberry variety having superior qualities to mulberry SF and is still unexplored in the context of suture biomaterial. AASF, Ar plasma treated AASF (AASFAr ) and PP-AASF are subjected to various characterization techniques for better comparison and the results are attempted to correlate with their observed properties. Excellent mechanical strength, hydrophobicity, antibacterial behavior, and remarkable wound healing activity of PP-AASF over AASF and AASFAr make it a promising candidate for application as sterilized suture biomaterial. © 2013 Wiley Periodicals, Inc. Biopolymers 101: 355-365, 2014. PMID:23913788

Gogoi, Dolly; Choudhury, Arup Jyoti; Chutia, Joyanti; Pal, Arup Ratan; Khan, Mojibur; Choudhury, Manash; Pathak, Pallabi; Das, Gouranga; Patil, Dinkar S

2014-04-01

375

Melt-spun bioactive sutures containing nanohybrids for local delivery of anti-inflammatory drugs.  

PubMed

In this work, a novel concept is introduced in drug-eluting fibres to ensure a good control of drug delivery features and wide applicability to different bioactive compounds. Composite bioactive sutures based on fibre grade poly(?-caprolactone) (PCL) and loaded with the anti-inflammatory drug Diclofenac (Dic) or a Dic nanohybrid where the drug is intercalated in a synthetic hydrotalcite (Mg/Al hydroxycarbonate) (HT-Dic) were developed. Fibres were prepared by melt-spinning at different PCL/HT-Dic/Dic ratios and analysed in terms of morphology, mechanical properties and drug release features. Results emphasized that tensile properties of fibres are clearly affected by Dic or HT-Dic addition, while the presence of knots has limited influence on the mechanical behaviour of the sutures. Release of Dic strongly depends on how Dic is loaded in the fibre (as free or nanohybrid) whereas the combination of free Dic and HT-Dic can allow a further tuning of release profile. In vivo experiments show a reduction of inflammatory responses associated with Dic-loaded fibers. Thus, a proof of principle is provided for a novel class of bioactive sutures integrating advanced controlled-release technologies. PMID:25175217

Catanzano, Ovidio; Acierno, Stefano; Russo, Pietro; Cervasio, Mariarosaria; Del Basso De Caro, Marialaura; Bolognese, Adele; Sammartino, Gilberto; Califano, Luigi; Marenzi, Gaetano; Calignano, Antonio; Acierno, Domenico; Quaglia, Fabiana

2014-10-01

376

Smart tissue anastomosis robot (STAR): a vision-guided robotics system for laparoscopic suturing.  

PubMed

This paper introduces the smart tissue anastomosis robot (STAR). Currently, the STAR is a proof-of-concept for a vision-guided robotic system featuring an actuated laparoscopic suturing tool capable of executing running sutures from image-based commands. The STAR tool is designed around a commercially available laparoscopic suturing tool that is attached to a custom-made motor stage and the STAR supervisory control architecture that enables a surgeon to select and track incisions and the placement of stitches. The STAR supervisory-control interface provides two modes: A manual mode that enables a surgeon to specify the placement of each stitch and an automatic mode that automatically computes equally-spaced stitches based on an incision contour. Our experiments on planar phantoms demonstrate that the STAR in either mode is more accurate, up to four times more consistent and five times faster than surgeons using state-of-the-art robotic surgical system, four times faster than surgeons using manual Endo360(°)®, and nine times faster than surgeons using manual laparoscopic tools. PMID:24658254

Leonard, Simon; Wu, Kyle L; Kim, Yonjae; Krieger, Axel; Kim, Peter C W

2014-04-01

377

Tectonic model for the island arc-continent suture zone, west-central Idaho: structural and geochemical constraints  

SciTech Connect

Two metamorphic terranes in west-central Idaho were juxtaposed along a compressive, transcurrent fault at approximately 118 Ma. Island arc rocks of the western terrane and terrigenous rocks of the eastern terrane were metamorphosed and deformed during the suturing event. Field and trace element data from the South Fork of the Clearwater River, central Idaho, indicate that plutonic rocks within the two terranes and in the intervening suture zones differ in time of emplacement relative to deformation and in probably source rock affinity. In the allochthonous western terrane, tonalitic plutons, which were deformed together with the metamorphic wall rocks, were intruded before suturing. After regional metamorphism, tonalitic, granodioritic, and granitic plutons of the Idaho batholith intruded the region. These plutons in the suture zone and in the eastern terrane are highly LREE enriched (La/Lu=25-30) indicating a continental source. Tonalitic and granodioritic plutons intruded first and were locally deformed in the suture zone. These post-suturing foliated plutons and cross-cutting unfoliated plutons indicate that intrusion began before deformation ceased. Granitic intrusions of the Idaho batholith post-dated penetrative deformation and possibly reflect a magmatic episode separate from the earlier Idaho batholith intrusions. The change between source rock affinities is abrupt (<5 km) and shows no geochemical evidence of mixing of source rock or contamination by upper crustal rock. This indicates that he oceanic-continental crustal boundary is sharp and near vertical.

Hoover, A.L.; Lund, K.; Snee, L.W.

1985-01-01

378

A reinterpretation of the metamaterial perfect absorber  

E-print Network

We analytically prove that the appearance of two almost, but not exactly out-of-phase currents inside a metamaterial is necessary for a perfect absorber. We further show that although evanescent waves do not contribute to far fields scattered by the perfect absorber, they however must consume the electromagnetic energy significantly.

Zeng, Yong; Dalvit, Diego A R

2012-01-01

379

Torsional vibration reduction using passive nonlinear absorbers  

Microsoft Academic Search

This paper considers the dynamic performance of systems of centrifugal pendulum vibration absorbers that are used to attenuate torsional vibrations in rotating systems. These absorbers, which can be found in certain IC engines and helicopter rotors, consist of movable masses whose centers of mass are kinematically restricted to move along prescribed paths relative to the rotor of interest. The most

Steven W. Shaw; Abdallah Alsuwaiyan

2000-01-01

380

Pyro-adaptive impact energy absorber  

Microsoft Academic Search

The paper contains a proposal of energy dissipation density controlling in lightweight thinwalled structures by reducing their crushing stiffness during an impact process. For small scale laboratory experiments, low-energy-dissipation absorber was developed. Prismatic absorber made of thin lead sheets can dissipate the impact energy at two energy density levels. Moving the concept to the real steel or aluminum structures can

Marian Ostrowski; Paulius Griskevicius; Jan Holnicki-Szulc

381

Solar energy absorber apparatus and method  

Microsoft Academic Search

An improved apparatus and method for absorbing solar energy, the apparatus providing a sealed envelope having a transparent upper panel with a solar energy absorbing panel thermally isolated against convective and conductive heat losses by a partial vacuum in the sealed envelope. The transparent panel has an upwardly extending curvilinear surface which increases its strength characteristics against the pressure differential

Johnson

1982-01-01

382

Solar energy absorber apparatus and method  

Microsoft Academic Search

An improved apparatus and method is presented for absorbing solar energy. The apparatus provides a sealed envelope having a transparent upper panel with a solar energy absorbing panel thermally isolated against convective and conductive heat losses by a partial vacuum in the sealed envelope. The transparent panel has an upwardly extending curvilinear surface which increases its strength characteristics against the

Johnson

1980-01-01

383

Diffraction can mimic saturation in multiphoton absorbers  

NASA Astrophysics Data System (ADS)

Many traditional investigations of saturation in multiphoton absorbers with the z-scan method use an approximate analytical formula that assumes a steady-state approximation. Using a numerical simulation for Maxwell's equations for laser propagation including diffraction and coupled electron population dynamics, we show that the commonly used analytical formula for determining saturation in multiphoton absorbers is often incorrect, even when the sample thickness is only one diffraction length. Using published experimental data on an organic chromophore, we show that saturation, in fact, does not occur at the laser intensity values predicted for these two and three photon absorbers. We numerically fit the published experimental z-scan data and obtain new absorption coefficients for multiphoton absorbers that accurately reflect their intrinsic values. The new values are from three to ten times larger than the published values. Because multiphoton absorbers are being used more extensively in many applications such as optical limiter, medical diagnostics and two photon microscopy, it is important to have accurate values for the two and three-photon absorption coefficients. Knowing the real value of the multiphoton absorber coefficients, even for a single diffraction length, is therefore of the utmost importance. In particular, the laser intensity at which the absorber saturates can determine which absorber is useful for a particular application.

Potasek, M.; Parilov, E.; Walker, M.

2014-03-01

384

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

2009-01-01

385

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

1990-01-01

386

Electromagnetic analysis of active radar absorbers  

Microsoft Academic Search

The details of an experimental active radar absorber have been presented. The absorber is based on the topology of a Salisbury screen but uses an active impedance layer to provide reflectivity tuning. The active impedance layer is a FSS controlled by semiconductor pin diodes. Measured reflectivity characteristics have been presented and compared to predictions obtained from a simple equivalent circuit

P. N. Kaleeba; A. Tennant; B. Chambers; J. P. Idez

2003-01-01

387

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

2010-01-01

388

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

1992-01-01

389

Solar sustained plasma/absorber conceptual design  

NASA Technical Reports Server (NTRS)

A space power system concept was evaluated which uses concentrated solar energy to heat a working fluid to temperatures as high as 4000 K. The high temperature working fluid could be used for efficient electric power production in advanced thermal or magnetohydrodynamic conversion cycles. Energy absorber configurations utilizing particles or cesium vapor absorber material were investigaed. Results of detailed radiant heat transfer calculations indicated approximately 86 percent of the incident solar energy could be absorbed within a 12-cm-dia flowing stream of gas borne carbon particles. Calculated total energy absorption in the cesium vapor seeded absorber configuration ranged from 34 percent to 64 percent of the incident solar energy. Solar flux concentration ratios of between approximately 3000 and 10,000 will be required to sustain absorber temperatures in the range from 3000 K to 4000 K.

Rodgers, R. J.; Krascella, N. L.; Kendall, J. S.

1979-01-01

390

A comparison of single-suture and double-suture incision closures in seaward-migrating juvenile Chinook salmon implanted with acoustic transmitters: implications for research in river basins containing hydropower structures  

SciTech Connect

Reductions in the size of acoustic transmitters implanted in migrating juvenile salmonids have resulted in the ability to make shorter incisions that may warrant using only a single suture for closure. However, it is not known if one suture will sufficiently hold the incision closed, particularly when outward pressure is placed on the surgical site such as when migrating fish experience pressure changes associated with passage at hydroelectric dams. The objective of this research was to evaluate the effectiveness of single-suture incision closures on juvenile Chinook salmon (Oncorhynchus tshawytscha). Juvenile Chinook salmon were surgically implanted with a 2012 Juvenile Salmon Acoustic Telemetry System (JSATS) transmitter (0.30 g) and a passive integrated transponder tag (0.10 g) and incisions were closed with either one suture or two sutures. Mortality and tag retention were monitored and fish were examined after 7 and 14 days to evaluate tissue responses. In a separate experiment, surgically implanted fish were exposed to simulated turbine passage and then examined for expulsion of transmitters, expulsion of viscera through the incision, and mortal injury. With incisions closed using a single suture, there was no mortality or tag loss and similar or reduced tissue reaction compared to incisions closed with two sutures. Further, surgery time was significantly reduced when one suture was used, which leads to less handling and reduced stress. No tags were expelled during pressure scenarios and expulsion of viscera only occurred in two non-mortally injured fish (5%) with single sutures that were also exposed to very high pressure changes. No viscera expulsion was present in fish exposed to pressure scenarios likely representative of hydroturbine passage at many Columbia River dams (e.g. <2.7 ratio of pressure change; an acclimation pressure of 146.2 absolute kpa and a lowest exposure pressure of ~ 53.3 absolute kpa). Based on these results, we recommend the use of a single suture for surgical implantation of transmitters with incisions that are approximately 5 1/2 mm long after tag insertion.

Brown, Richard S.; Deters, Katherine A.; Cook, Katrina V.; Eppard, M. B.

2013-07-15

391

Mesozoic and Cenozoic tectonics of the eastern and central Alaska Range: Progressive basin development and deformation in a suture zone  

USGS Publications Warehouse

Analysis of late Mesozoic and Cenozoic sedimentary basins, metamorphic rocks, and major faults in the eastern and central Alaska Range documents the progressive development of a suture zone that formed as a result of collision of an island-arc assemblage (the Wrangellia composite terrane) with the former North American continental margin. New basin-analysis, structural, and geochronologic data indicate the following stages in the development of the suture zone: (1) Deposition of 3-5 km of Upper Jurassic-Upper Cretaceous marine strata (the Kahiltna assemblage) recorded the initial collision of the island-arc assemblage with the continental margin. The Kahiltna assemblage exposed in the northern Talkeetna Mountains represents a Kimmeridgian-Valanginian backarc basin that was filled by northwestward-flowing submarine-fan systems that were transporting sediment derived from Mesozoic strata of the island-arc assemblage. The Kahiltna assemblage exposed in the southern Alaska Range represents a Valanginian-Cenomanian remnant ocean basin filled by west-southwestward-flowing submarine-fan systems that were transporting sediment derived from Paleozoic continental-margin strata uplifted in the along-strike suture zone. A belt of retrograde metamorphism and a regional anticlinorium developed along the continental margin from 115 to 106 Ma, roughly coeval with the end of widespread deposition in the Kahiltna sedimentary basins. (2) Metamorphism of submarine-fan deposits of the Kahiltna basin, located near the leading edge of the island-arc assemblage, occurred at ca. 74 Ma, as determined from a new U-Pb zircon age for a synkinematic sill. Coeval with metamorphism of deposits of the Kahiltna basin in the southern part of the suture zone was development of a thrust-top basin, the Cantwell basin, in the northern part of the suture zone. Geologic mapping and compositional data suggest that the 4 km of Upper Cretaceous nonmarine and marginal marine sedimentary strata in this basin record regional subaerial uplift of the suture zone. (3) Shortening and exhumation of the suture zone peaked from 65 to 60 Ma on the basis of metamorphic and geochronologic data. In the southern part of the suture zone, submarine-fan deposits of the Kahiltna basin, which had been metamorphosed to kyanite schists at ???25 km depth and ???650 ??C, were exhumed and cooled through the biotite closure temperature (???300 ??C) by ca. 62 Ma. In the northern part of the suture zone, this time period was marked by shortening, uplift, and erosion of sedimentary strata of the Cantwell basin. (4) From 60 to 54 Ma, ???3 km of volcanic strata were deposited over deformed sedimentary strata of the Cantwell basin, and several granitic plutons (the McKinley sequence) were emplaced along the suture zone. (5) Following igneous activity, strikeslip displacement occurred from ca. 54 to 24 Ma along the Denali fault system, which had developed in the existing suture zone. Late Eocene-Oligocene strike-slip displacement resulted in the formation of several small sedimentary basins along the Denali fault system. (6) Regional transpressive shortening characterized the suture zone from ca. 24 Ma to the present. Flexural subsidence, related to regional shortening, is represented by late Eocene to Holocene nonmarine deposits of the Tanana foreland basin. Regional subsidence resulted in Miocene coal seams up to 20 m thick and well-developed lacustrine deposits. Overlying the Miocene deposits are ???1.2 km of Pliocene and Holocene conglomeratic deposits. Compositional and paleocurrent data from these younger deposits record regional Neogene uplift of the suture zone and recycling of detritus from older basins to the south that had become incorporated into the uplifted suture zone. Geologic mapping of major thrust faults along the northern and southern margins of the suture zone documents Paleozoic strata thrust over both Pliocene fluvial deposits and Quaternary glacial deposits of the Tanana basin.

Ridgway, K. D.; Trop, J. M.; Nokleberg, W. J.; Davidson, C. M.; Eastham, K. R.

2002-01-01

392

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

PubMed Central

Background A recently published meta-analysis comparing metallic staples to sutures in orthopaedic procedures revealed three fold increase in risk for infection in stapled wounds. The studies included in the meta-analysis are at risk of bias due to experimental design limitations. A large randomized controlled trial is proposed to direct orthopaedic surgeons in their choice of wound closure material. Methods/Design A parallel group randomized controlled trial with institutional review board approval will be conducted. Patients will be randomized intraoperatively to have skin wounds closed with sutures or staples. Dressings will be used to maintain blinding outcome assessors. The primary outcome measure will be a composite all-cause wound complication outcome measure composed of: infection, wound drainage, wound necrosis, blistering, dehiscence, suture abscess and material sensitivity reaction. An independent review board blinded to treatment assignment will adjudicate suspected complications based on clinical data. All deceased patients will also be reviewed. An interim analysis of complications will take place after half of the patients have been recruited. All data will be analyzed by a blinded statistician. Dichotomous primary and secondary outcome measures will be analyzed using the Chi-squared statistic. Continuous outcome measures will be analyzed using Student's?t-test. Subgroup analysis will compare infection rates using sutures versus staples in each anatomic area (upper extremity, pelvis/acetabulum, hip/femur, knee, ankle). A further subgroup analysis will be conducted comparing trauma patients to elective surgery patients. Non-infected revision surgery will also be compared to primary surgery. Discussion Wound closure material is an afterthought for many orthopaedic surgeons. The combined results of several comparative trials suggests that the choice of wound closure materials may have an impact on the rate of surgical site infections. However, the strength of the evidence is poor given the heterogeneity of the methods employed in previous studies. The following study protocol aims to guide surgeons in their choice of wound closure material by determining if there is a difference in complication rates in sutured and stapled wounds. Trial Registration This trial was registered at ClinicalTrials.gov under the identifier NCT01146236 (registered June 14, 2010) PMID:22672186

2012-01-01

393

Torsional vibration reduction using passive nonlinear absorbers  

NASA Astrophysics Data System (ADS)

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

Shaw, Steven W.; Alsuwaiyan, Abdallah

2000-04-01

394

Customised broadband metamaterial absorbers for arbitrary polarisation  

E-print Network

This paper shows that customised broadband absorption of electromagnetic waves having arbitrary polarisation is possible by use of lossy cut-wire (CW) metamaterials. These useful features are confirmed by numerical simulations in which different lengths of CW pairs are combined as one periodic metamaterial unit and placed near to a perfect electric conductor (PEC). So far metamaterial absorbers have exhibited some interesting features, which are not available from conventional absorbers, e.g. straightforward adjustment of electromagnetic properties and size reduction. The paper shows how with proper design a broad range of absorber characteristics may be obtained.

Wakatsuchi, Hiroki; Christopoulos, Christos; Paul, John

2010-01-01

395

Microwave diode switchable metamaterial reflector/absorber  

NASA Astrophysics Data System (ADS)

We embed diodes as active circuit elements within a metamaterial to implement a switchable metamaterial reflector/absorber at microwave frequencies. Diodes are placed in series with the unit cells of the metamaterial array. This results in just a pair of control lines to actively tune all the diodes in a metamaterial. Diodes can be tuned on and off to switch the function of the metamaterial between a perfect absorber and a reflector. The design, simulation, and experimental results of a switchable reflector/absorber in 2-6 GHz range are presented.

Xu, Wangren; Sonkusale, Sameer

2013-07-01

396

Plasmonic and Metamaterial Structures as Electromagnetic Absorbers  

E-print Network

Electromagnetic absorbers have drawn increasing attention in many areas. A series of plasmonic and metamaterial structures can work as efficient narrow band absorbers due to the excitation of plasmonic or photonic resonances, providing a great potential for applications in designing selective thermal emitters, bio-sensing, etc. In other applications such as solar energy harvesting and photonic detection, the bandwidth of light absorbers is required to be quite broad. Under such a background, a variety of mechanisms of broadband/multiband absorption have been proposed, such as mixing multiple resonances together, exciting phase resonances, slowing down light by anisotropic metamaterials, employing high loss materials and so on.

Cui, Yanxia; Jin, Yi; Ding, Fei; Yang, Liu; Ye, Yuqian; Zhong, Shoumin; Lin, Yinyue; He, Sailing

2014-01-01

397

Customised broadband metamaterial absorbers for arbitrary polarisation.  

PubMed

This paper shows that customised broadband absorption of electromagnetic waves having arbitrary polarisation is possible by use of lossy cut-wire (CW) metamaterials. These useful features are confirmed by numerical simulations in which different lengths of CW pairs are combined as one periodic metamaterial unit and placed near to a perfect electric conductor (PEC). So far metamaterial absorbers have exhibited some interesting features, which are not available from conventional absorbers, e.g. straightforward adjustment of electromagnetic properties and size reduction. The paper shows how with proper design a broad range of absorber characteristics may be obtained. PMID:20941120

Wakatsuchi, Hiroki; Greedy, Stephen; Christopoulos, Christos; Paul, John

2010-10-11

398

Conformal metamaterial absorber for curved surface.  

PubMed

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

2013-10-01

399

[A comparative study of salpingotomies with or without suture. An experimental microsurgical research carried out on rabbits' tubes (author's transl)].  

PubMed

Two techniques of salpingotomy have been compared in two series of rabbit experiments with the aim of finding out whether, when carrying out conservative surgery in extra-uterine pregnancy with rupture of the tube, it is better to suture the salpingotomy or to leave it open without suture. The two series show that there is no difference as far as the frequency of large adhesions, as far as ovulation and the strength of the scar and the pregnancy rate g out conservative surgery in extra-uterine pregnancy with rupture of the tube, it is better to suture the salpingotomy or to leave it open without suture. The two series show that there is no difference as far as the frequency of large adhesions, as far as ovulation and the strength of the scar and the pregnancy rate g out conservative surgery in extra-uterine pregnancy with rupture of the tube, it is better to suture the salpingotomy or to leave it open without suture. The two series show that there is no difference as far as the frequency of large adhesions, as far as ovulation and the strength of the scar and the pregnancy rate following the two methods. On the other hand, implantation is less good when the tube is left open than when the salpingotomy is sewn up. In the first series there was a significant difference between the side that was operated on and the control side, whereas the second series there was very little difference. In spite of the fact that the scar seemed to be apparently of the same type, the eggs were able to descend more easily in the oviduct when it had been sutured. PMID:7338598

Gordji, M; Henry-Suchet, J; Pigeaud, F; Tesquier, L; Debache, C; Achard, B; Chahine, N; Loffredo, V

1981-01-01

400

Surgical implantation of radiotelemetry devices in American river otters.  

PubMed

The Oklahoma Department of Wildlife Conservation elected to investigate the feasibility of reintroducing American river otters (Lutra canadensis) into Oklahoma waterways. Intra-abdominal radiotelemetry devices were selected to monitor otter movements following release. For implantation of those devices, the anesthetic regimen included a mixture of ketamine HCl, xylazine, and acepromazine maleate given intramuscularly followed by delivery of isoflurane through precision vaporizers. A ventral midline approach and adherent surgical barrier drapes facilitated aseptic placement of the devices, with minimal tissue damage and loss of insulating pelage. Absorbable monofilament suture (polydioxanone) was used in a buried 3-layer closure of surgical incisions. The incisions healed rapidly and without complications. PMID:6511574

Hoover, J P

1984-12-01

401

Efficient waveform recall in absorbing media  

Microsoft Academic Search

Summary form only given. We have shown that efficient recall of temporally structured optical pulses in absorbing media can be obtained via the photon echo process if the absorption length and pulse area of brief pulses are appropriately chosen

C. S. Cornish; M. Azadeh; W. R. Babbitt; L. Tsang

1998-01-01

402

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.

2005-01-01

403

Energy absorber uses expanded coiled tube  

NASA Technical Reports Server (NTRS)

Mechanical shock mitigating device, based on working material to its failure point, absorbs mechanical energy by bending or twisting tubing. It functions under axial or tangential loading, has no rebound, is area independent, and is easy and inexpensive to build.

Johnson, E. F.

1972-01-01

404

Passive Earth Entry Vehicle Energy Absorbing Systems  

NASA Astrophysics Data System (ADS)

A critical element of a passive EEV performance is the energy absorbing system required to attenuate the dynamic landing loads. Two design approaches are described and the pros and cons based on particular mission requirements are discussed.

Kellas, S.; Maddock, R. W.

2014-06-01

405

Neutron absorbing coating for nuclear criticality control  

DOEpatents

A neutron absorbing coating for use on a substrate, and which provides nuclear criticality control is described and which includes a nickel, chromium, molybdenum, and gadolinium alloy having less than about 5% boron, by weight.

Mizia, Ronald E. (Idaho Falls, ID); Wright, Richard N. (Idaho Falls, ID); Swank, William D. (Idaho Falls, ID); Lister, Tedd E. (Idaho Falls, ID); Pinhero, Patrick J. (Idaho Falls, ID)

2007-10-23

406

An ultra-broadband multilayered graphene absorber.  

PubMed

An ultra-broadband multilayered graphene absorber operating at terahertz (THz) frequencies is proposed. The absorber design makes use of three mechanisms: (i) The graphene layers are asymmetrically patterned to support higher order surface plasmon modes that destructively interfere with the dipolar mode and generate electromagnetically induced absorption. (ii) The patterned graphene layers biased at different gate voltages backed-up with dielectric substrates are stacked on top of each other. The resulting absorber is polarization dependent but has an ultra-broadband of operation. (iii) Graphene's damping factor is increased by lowering its electron mobility to 1000 cm²/Vs. Indeed, numerical experiments demonstrate that with only three layers, bandwidth of 90% absorption can be extended upto 7THz, which is drastically larger than only few THz of bandwidth that can be achieved with existing metallic/graphene absorbers. PMID:24514545

Amin, Muhammad; Farhat, Mohamed; Ba?c?, Hakan

2013-12-01

407

Passive vibration absorber with dry friction  

Microsoft Academic Search

Summary  ?The properties of a passive vibration absorber with dry friction significantly differ from those of the classical linear\\u000a absorber. The exceptional phenomenon is the possibility of suppressing all excited modes. This effect is influenced to a small\\u000a extent by a special shape of the friction characteristic, but mainly by an appropriately adjusted threshold of the static\\u000a friction. The theoretical predictions

A. Hartung; H. Schmieg; P. Vielsack

2001-01-01

408

A planar polarization-insensitive metamaterial absorber  

Microsoft Academic Search

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

Yongzhi Cheng; Helin Yang; Zhengze Cheng; Boxun Xiao

2011-01-01

409

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.

2009-05-01

410

Sulcus vocalis: excision, primary suture and medialization laryngoplasty: personal experience with 44 cases.  

PubMed

This is a prospective, cohort study to present personal experience on excision of sulcus, primary suture of defect and medialization laryngoplasty. An article about this subject is not present in medical literature. Forty-four patients with sulcus vocalis who were operated on by excision, primary suture of epithelial defect and medialization laryngoplasty were included. Pre- and postoperative evaluations included GRBAS, VHI-30, stroboscopy, aerodynamic and acoustic analysis. Grade, roughness and breathiness of GRBAS were significantly better postoperatively (p < 0.05), whereas asthenia and strain were not (p > 0.05). All VHI-30 results decreased significantly after surgery (p < 0.01). Glottal closure and mucosal wave amplitude during stroboscopy improved significantly postoperatively (p < 0.05), whereas symmetry and periodicity did not (p > 0.05). Maximum phonation time, mean airflow rate, mean efficiency and mean pressure of aerodynamic analysis improved significantly after surgery (p < 0.05). However, mean resistance and mean power were not significantly different (p > 0.05). All parameters, except F (0) and soft phonation index during acoustic analysis with /a/, and except F (0), voice turbulence index and soft phonation index during acoustic analysis with constant phrase improved significantly after surgery (p < 0.05). Surgical treatments of sulcus vocalis are not satisfactory enough, yet. Excision of sulcus, primary suture of epithelial defect and medialization laryngoplasty is one of the successful surgical options. Intact vocal ligament at the bottom of sulcus is a good prognostic sign for good postoperative voice result. Success appears to depend on how long, how wide and how deep sulcus is. Good patient selection may increase the percentage of happy patients. PMID:22669269

Y?lmaz, Taner

2012-11-01

411

Early weightbearing using Achilles suture bridge technique for insertional Achilles tendinosis: a review of 43 patients.  

PubMed

Posterior heel pain caused by insertional Achilles tendinosis can necessitate surgical intervention when recalcitrant to conservative care. Surgical treatment can necessitate near complete detachment of the Achilles tendon to fully eradicate the offending pathologic features and, consequently, result in long periods of non-weightbearing. A suture bridge technique using bone anchors is available for reattachment of the Achilles tendon. This provides restoration of the Achilles footprint on the calcaneus, including not only contact, but also actual pressure between the tendon and bone. We performed a review of 43 patients who underwent surgical treatment of insertional Achilles tendinosis with reattachment of the Achilles tendon using the suture bridge technique. The mean age was 53 (range 29 to 87) years. The mean follow-up period was 24 (range 13 to 52) months. The mean postoperative American Orthopaedic Foot and Ankle Society score was 90 (range 65 to 100). The mean preoperative visual analog scale pain score was 6.8 (range 2 to 10) and the mean postoperative visual analog scale pain score was 1.3 (range 0 to 6). The mean interval to weightbearing was 10 (range 0 to 28) days. No postoperative ruptures occurred. Of the 43 patients, 42 (97.6%) successfully performed the single heel rise test at the final postoperative visit. Concomitant procedures were performed in 35 patients, including 33 (77%) requiring open gastrocnemius recession and 2 (5%) requiring flexor hallucis longus tendon transfer. A total of 42 patients (97.6%) returned to regular shoe gear, and 42 (97.6%) returned to their activities of daily living, including running for 20 athletic patients (100%). Complications included postoperative wound dehiscense requiring surgical debridement in 2 patients (5%) and soft tissue infection requiring antibiotics and surgical debridement in 1 (2%) patient. Our findings support using the Achilles tendon suture bridge for reattachment of the Achilles tendon in the surgical treatment of insertional Achilles tendinosis. PMID:23669005

Rigby, Ryan B; Cottom, James M; Vora, Anand

2013-01-01

412

Perfect terahertz absorber using fishnet based metafilm  

SciTech Connect

We present a perfect terahertz (THz) absorber working for a broad-angle of incidence. The two fold symmetry of rectangular fishnet structure allows either complete absorption or mirror like reflection depending on the polarization of incident the THz beam. Metamaterials enable the ability to control the electromagnetic wave in a unique fashion by designing the permittivity or permeability of composite materials with desired values. Although the initial idea of metamaterials was to obtain a negative index medium, however, the evolution of metamaterials (MMs) offers a variety of practically applicable devices for controlling electromagnetic wave such as tunable filters, modulators, phase shifters, compact antenna, absorbers, etc. Terahertz regime, a crucial domain of the electromagnetic wave, is suffering from the scarcity of the efficient devices and might take the advantage of metamaterials. Here, we demonstrate design, fabrication, and characterization of a terahertz absorber based on a simple fishnet metallic film separated from a ground mirror plane by a dielectric spacer. Such absorbers are in particular important for bolometric terahertz detectors, high sensitivity imaging, and terahertz anechoic chambers. Recently, split-ring-resonators (SRR) have been employed for metamaterial-based absorbers at microwave and THz frequencies. The experimental demonstration reveals that such absorbers have absorptivity close to unity at resonance frequencies. However, the downside of these designs is that they all employ resonators of rather complicated shape with many fine parts and so they are not easy to fabricate and are sensitive to distortions.

Azad, Abul Kalam [Los Alamos National Laboratory; Shchegolkov, Dmitry Yu [Los Alamos National Laboratory; Chen, Houtong [Los Alamos National Laboratory; Taylor, Antoinette [Los Alamos National Laboratory; Smirnova, E I [Los Alamos National Laboratory; O' Hara, John F [Los Alamos National Laboratory

2009-01-01

413

A Systematic Review of Systematic Reviews and Panoramic Meta-Analysis: Staples versus Sutures for Surgical Procedures  

PubMed Central

Objective To systematically evaluate the evidence across surgical specialties as to whether staples or sutures better improve patient and provider level outcomes. Design A systematic review of systematic reviews and panoramic meta-analysis of pooled estimates. Results Eleven systematic reviews, including 13,661 observations, met the inclusion criteria. In orthopaedic surgery sutures were found to be preferable, and for appendicial stump sutures were protective against both surgical site infection and post surgical complications. However, staples were protective against leak in ilecolic anastomosis. For all other surgery types the evidence was inconclusive with wider confidence intervals including the possibly of preferential outcomes for surgical site infection or post surgical complication for either staples or sutures. Whilst reviews showed substantial variation in mean differences in operating time (I2 94%) there was clear evidence of a reduction in average operating time across all surgery types. Few reviews reported on length of stay, but the three reviews that did (I2 0%, including 950 observations) showed a non significant reduction in length of stay, but showed evidence of publication bias (P-value for Egger test 0.05). Conclusions Evidence across surgical specialties indicates that wound closure with staples reduces the mean operating time. Despite including several thousand observations, no clear evidence of superiority emerged for either staples or sutures with respect to surgical site infection, post surgical complications, or length of stay. PMID:24116028

Hemming, Karla; Pinkney, Thomas; Futaba, Kay; Pennant, Mary; Morton, Dion G.; Lilford, Richard J.

2013-01-01

414

Stimulatory effects of low-power laser irradiation on bone regeneration in midpalatal suture during expansion in the rat.  

PubMed

The purpose of this study was to investigate the effects of low-power laser irradiation on bone regeneration during expansion of a midpalatal suture in rats. Gallium-aluminum-arsenide diode laser 100 mW irradiation was applied to the midpalatal suture during expansion carried out over 7 days (3 or 10 minutes per day), 3 days (7 minutes per day for day 0-2 or 4-6), and 1 day (21 uninterrupted minutes on day 0). The bone regeneration in the midpalatal suture estimated by histomorphometric method in the 7-day irradiation group showed significant acceleration at 1.2- to 1.4-fold compared with that in the nonirradiated rats, and this increased rate was irradiation dose-dependent. Irradiation during the early period of expansion (days 0 to 2) was most effective, whereas neither the later period (days 4 to 6) nor the one-time irradiation had any effect on bone regeneration. These findings suggest that low-power laser irradiation can accelerate bone regeneration in a midpalatal suture during rapid palatal expansion and that this effect is dependent not only on the total laser irradiation dosage but also on the timing and frequency of irradiation. We suggest laser therapy may be of therapeutic benefit in inhibiting relapse and shortening the retention period through acceleration of bone regeneration in the midpalatal suture. PMID:9155812

Saito, S; Shimizu, N

1997-05-01

415

Laparoscopic nonresectional suture rectopexy in the management of full-thickness rectal prolapse: substantive retrospective series  

Microsoft Academic Search

Background  Numerous surgical options exist for the correction of rectal prolapse, with the optimal choice remaining controversial. The\\u000a laparoscopic approach has proved to be popular and effective. Concern exists about nonresectional rectopexy in the form of\\u000a intractable postoperative constipation. The authors present their experience with nonresectional laparoscopic suture rectopexy.\\u000a \\u000a \\u000a \\u000a \\u000a Methods  All patients presenting with a full-thickness rectal prolapse between August 1994 and

Jonathan Wilson; Alec Engledow; James Crosbie; Tan Arulampalam; Roger Motson

2011-01-01

416

Successful Angioplasty of a Superficial Femoral Artery Stenosis Caused by a Suture-Mediated Closure Device  

SciTech Connect

We report the successful angioplasty of an acute arterial narrowing after suture-mediated closure (SMC) of a femoral arterial puncture. A 75-year-old woman underwent a cerebral arteriogramvia a right common femoral artery puncture. The arteriotomy site was closed with a SMC device. Four days after placement the patient complained of pain in her right calf after walking. An arteriogram 7 days after SMC showed a severe focal stenosis at the origin of the superficial femoral artery involving the presumed puncture site. The lesion was successfully treated with balloon angioplasty. The patient at 6 months was asymptomatic.

Gemmete, Joseph J., E-mail: gemmete@umich.edu; Dasika, Narasimham; Forauer, Andrew R.; Cho, Kyung; Williams, David M. [University of Michigan, Ann Arbor, Michigan, Department of Radiology (United States)

2003-08-15

417

Transosseous fixation of pediatric displaced mandibular fractures with polyglactin resorbable suture--a simplified technique.  

PubMed

Management of pediatric mandibular fractures presents a unique challenge to surgeons in terms of its numerous variations compared to adults. Both conservative and open methods have been advocated with their obvious limitations and complications. However, conservative modalities may not be possible in grossly displaced fractures, which necessitate the open method of fixation. We present a novel and simplified technique of transosseous fixation of displaced pediatric mandibular fractures with polyglactin resorbable suture, which provides adequate stability without any interference with tooth buds and which is easy to master. PMID:24220403

Chandan, Sanjay; Halli, Rajshekhar; Joshi, Samir; Chhabaria, Gaurav; Setiya, Sneha

2013-11-01

418

Ulnar shortening after TFCC suture repair of Palmer type 1B lesions  

Microsoft Academic Search

Purpose  The objective of this study was to determine functional and subjective outcomes of an ulnar shortening procedure elected by\\u000a patients who experienced persistent ulno-carpal symptoms following arthroscopic suture repair of a Palmer type 1B lesion.\\u000a All patients had a dynamic ulna positive variance.\\u000a \\u000a \\u000a \\u000a Methods  Five patients (3 males and 2 females) with arthroscopic repair of Palmer type 1B tears who subsequently

Maya B. Wolf; Markus W. Kroeber; Andreas Reiter; Susanne B. Thomas; Peter Hahn; Raymund E. Horch; Frank Unglaub

2010-01-01

419

21 CFR 868.5310 - Carbon dioxide absorber.  

Code of Federal Regulations, 2012 CFR

...2012-04-01 2012-04-01 false Carbon dioxide absorber. 868.5310 Section 868...Therapeutic Devices § 868.5310 Carbon dioxide absorber. (a) Identification. A carbon dioxide absorber is a device that is...

2012-04-01

420

21 CFR 868.5300 - Carbon dioxide absorbent.  

...2014-04-01 2014-04-01 false Carbon dioxide absorbent. 868.5300 Section 868...Therapeutic Devices § 868.5300 Carbon dioxide absorbent. (a) Identification. A carbon dioxide absorbent is a device intended for...

2014-04-01

421

21 CFR 868.5310 - Carbon dioxide absorber.  

...2014-04-01 2014-04-01 false Carbon dioxide absorber. 868.5310 Section 868...Therapeutic Devices § 868.5310 Carbon dioxide absorber. (a) Identification. A carbon dioxide absorber is a device that is...

2014-04-01

422

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 868...Therapeutic Devices § 868.5300 Carbon dioxide absorbent. (a) Identification. A carbon dioxide absorbent is a device intended for...

2013-04-01

423

21 CFR 868.5310 - Carbon dioxide absorber.  

Code of Federal Regulations, 2011 CFR

...2011-04-01 2011-04-01 false Carbon dioxide absorber. 868.5310 Section 868...Therapeutic Devices § 868.5310 Carbon dioxide absorber. (a) Identification. A carbon dioxide absorber is a device that is...

2011-04-01

424

21 CFR 868.5300 - Carbon dioxide absorbent.  

Code of Federal Regulations, 2012 CFR

...2012-04-01 2012-04-01 false Carbon dioxide absorbent. 868.5300 Section 868...Therapeutic Devices § 868.5300 Carbon dioxide absorbent. (a) Identification. A carbon dioxide absorbent is a device intended for...

2012-04-01

425

21 CFR 868.5300 - Carbon dioxide absorbent.  

Code of Federal Regulations, 2011 CFR

...2011-04-01 2011-04-01 false Carbon dioxide absorbent. 868.5300 Section 868...Therapeutic Devices § 868.5300 Carbon dioxide absorbent. (a) Identification. A carbon dioxide absorbent is a device intended for...

2011-04-01

426

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 868...Therapeutic Devices § 868.5310 Carbon dioxide absorber. (a) Identification. A carbon dioxide absorber is a device that is...

2013-04-01

427

Sutures - separated  

MedlinePLUS

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

428

Bricolage Suture  

E-print Network

over her shoulders and then wraps them around her knees again, curls her head down in-between her legs and waits for the moment to pass. Cold wind hisses past the red brick walls on either side of the alley. Carmen trembles and buries her head deeper... leaning against a wall, in an alleyway. He approaches her, watching over his shoulder. “I’m looking for a womb for the weekend.” “You got balls, asking that cold. What if I’m a narc?” She digs at her fingernails. “Intuition. Fifty thousand for three...

Wilson, Robert Justin

2014-05-31

429

Effects of sutures and fontanels on MEG and EEG source analysis in a realistic infant head model  

PubMed Central

In infants, the fontanels and sutures as well as conductivity of the skull influence the volume currents accompanying primary currents generated by active neurons and thus the associated electroencephalography (EEG) and magnetoencephalography (MEG) signals. We used a finite element method (FEM) to construct a realistic model of the head of an infant based on MRI images. Using this model, we investigated the effects of the fontanels, sutures and skull conductivity on forward and inverse EEG and MEG source analysis. Simulation results show that MEG is better suited than EEG to study early brain development because it is much less sensitive than EEG to distortions of the volume current caused by the fontanels and sutures and to inaccurate estimates of skull conductivity. Best results will be achieved when MEG and EEG are used in combination. PMID:23531680

Lew, Seok; Sliva, Danielle D.; Choe, Myong-sun; Grant, P. Ellen; Okada, Yoshio; Wolters, Carsten H.; Hamalainen, Matti S.

2013-01-01

430

A New Technique to Reattach an Extended Trochanteric Osteotomy in Revision THA Using Suture Cord  

PubMed Central

The extended trochanteric osteotomy (ETO) is widely used for revision total hip arthroplasty (THA). We describe a novel technique to reattach the extended trochanteric osteotomy using a suture cord. We retrospectively reviewed 20 patients who underwent revision by this technique with a minimum followup of 2 years (mean, 2.2 years; range, 2–4 years). Bony union of the osteotomy occurred in 19 patients and fibrous union in one patient who remained asymptomatic. We observed proximal migration of the osteotomy fragment in one patient (5 mm) who had bony union of the osteotomy. This technique of anchoring the osteotomy fragment directly onto the prosthetic stem using a suture cord provides a secure fixation and does not endanger the blood supply of the osteotomy. It also has the advantage of avoiding the morbidity associated with cerclage wires and the costs associated with cabling systems. Level of Evidence: Level IV, therapeutic study. See the Guidelines for Authors for a complete description of levels of evidence. PMID:18386112

Landsmeer, Ronald; Debnath, Ujjwal Kanti; Suresh, Shivakolundu Pachai; Thomas, Tudor Lloyd

2008-01-01

431

Video-Assisted Thoracoscopic Suture Closure of Blebs to Treat Primary Spontaneous Pneumothorax  

PubMed Central

Background and Objectives: If surgery is indicated for primary spontaneous pneumothorax (PSP), video-assisted thoracoscopic surgery (VATS) using an endoscopic linear cutter to resect the involved blebs is the most popular treatment. We tried to determine whether closure of the blebs with sutures without resection is also efficacious enough to treat PSP. Methods: We prospectively analyzed 22 episodes of PSP in 21 patients from January 2001 to April 2002. We endosutured the blebs, without removing them, no matter what the size and the number of the blebs were. Coagulation pleurodesis was added in every case. Only 3 ports were needed during the procedure. Results: Morbidity and cost efficiency were acceptable. Two recurrences were experienced. The reasons for the recurrences were poor performance of the endo-suture in 1 patient, and no obvious blebs found in the other. Conclusions: We believe that VATS wedge closure of blebs by imbricating and buttressing them, without resection, is a feasible and effective alternative treatment for primary spontaneous pneumothorax. PMID:14974660

Chou, Shah-Hwa; Kao, Eing-Long

2004-01-01

432

Uterine closure with unlocked suture in cesarean section: Safety and Quality  

PubMed Central

Objective: Comparing locked and unlocked uterine closure techniques in terms of bleeding control and uterine incision healing. Methods: The patients undergoing cesarean section in Sifa University Hospital between May - October 2012 were accepted to this prospective controlled study. Primarily, safety was evaluated. The hemoglobin count (HC) and serum creatine kinase (CK) levels of the patients in the locked (n = 47) and unlocked (n = 35) groups were measured just before and 24 hours after operation. Hemoglobin deficit, increase in CK and the additional hemostatic sutures were compared. Secondly, uterine scar healing was evaluated three months later. Scar thickness, niche and percentage of thinning of the scar region of the locked (n = 27) and unlocked (n = 32) groups were calculated and compared. Results: The hemoglobin deficit was similar in two groups. CK rise was less in the unlocked group but it was not significant (P = 0.082). Unlocked group needed more additional sutures (P = 0.016). The thickness of the niche and the percentage of thinning of the scar region were significantly less in the unlocked group (P= 0.002, P=0.000). Conclusions: Unlocked uterine closure technique is safe and has less damage to the myometrium. PMID:24948973

Turan, Guluzar Arzu; Gur, Esra Bahar; Tatar, Sumeyra; Gokduman, Ayse; Guclu, Serkan

2014-01-01

433