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1

Suture loosening and gamma sterilization of 10-0 nylon.  

UK PubMed Central (United Kingdom)

The tissue reaction to 10-0 nylon sutures sterilized with gamma-rays was compared to the reaction caused by 10-0 nylon thread sterilized with ethylene oxide. In a vascularized cornea more tissue reaction was seen to 10-0 nylon thread sterilized with gamma-rays than to sutures sterilized with ethylene oxide gas.

van Rij G

1980-04-01

2

Suture loosening and gamma sterilization of 10-0 nylon.  

Science.gov (United States)

The tissue reaction to 10-0 nylon sutures sterilized with gamma-rays was compared to the reaction caused by 10-0 nylon thread sterilized with ethylene oxide. In a vascularized cornea more tissue reaction was seen to 10-0 nylon thread sterilized with gamma-rays than to sutures sterilized with ethylene oxide gas. PMID:6995051

van Rij, G

1980-04-15

3

A comparison of a new polypropylene suture with Prolene.  

UK PubMed Central (United Kingdom)

The purpose of this paper is to examine the performance of the newly available monofilament polypropylene suture (Surgipro) manufactured by U.S. Surgical and compare it with commercial Prolene sutures for determining the merit of this new suture. Two different sizes of Surgipro sutures were used. They were 4/0 and 0 sizes and were tested in terms of their fundamental properties: level of crystallinity, melting temperature, fiber morphology, and mechanical properties including knot strength and knot security. The effect of three different sterilization methods on the mechanical and fundamental properties of the new polypropylene (PP) sutures was also examined. In general, the new Surgipro sutures performed as good as Prolene sutures in terms of mechanical properties; but there were some differences in fundamental properties between these two types of PP sutures, particularly in finer size PP sutures. The major differences were in interior fiber morphology, level of crystallinity, and melting temperature. Surgipro suture fibers showed homogeneous interior morphology, while Prolene fibers exhibited two distinctive fiber morphologies. These two types of PP suture fibers also responded differently to the three sterilization methods tested. Surgipro sutures are less affected by different sterilization methods than the same size Prolene control. Except for the Co 60 gamma sterilization, Surgipro suture fibers did not exhibit statistically significant differences in tensile breaking strength between sterilized and control. Ethylene oxide and autoclave sterilized Prolene suture fibers, however, showed statistically (p less than 0.05) consistently lower tensile breaking strength than their unsterilized controls.(ABSTRACT TRUNCATED AT 250 WORDS)

Chu CC; Pratt L; Zhang L; Hsu A; Chu A

1993-01-01

4

A comparison of a new polypropylene suture with Prolene.  

Science.gov (United States)

The purpose of this paper is to examine the performance of the newly available monofilament polypropylene suture (Surgipro) manufactured by U.S. Surgical and compare it with commercial Prolene sutures for determining the merit of this new suture. Two different sizes of Surgipro sutures were used. They were 4/0 and 0 sizes and were tested in terms of their fundamental properties: level of crystallinity, melting temperature, fiber morphology, and mechanical properties including knot strength and knot security. The effect of three different sterilization methods on the mechanical and fundamental properties of the new polypropylene (PP) sutures was also examined. In general, the new Surgipro sutures performed as good as Prolene sutures in terms of mechanical properties; but there were some differences in fundamental properties between these two types of PP sutures, particularly in finer size PP sutures. The major differences were in interior fiber morphology, level of crystallinity, and melting temperature. Surgipro suture fibers showed homogeneous interior morphology, while Prolene fibers exhibited two distinctive fiber morphologies. These two types of PP suture fibers also responded differently to the three sterilization methods tested. Surgipro sutures are less affected by different sterilization methods than the same size Prolene control. Except for the Co 60 gamma sterilization, Surgipro suture fibers did not exhibit statistically significant differences in tensile breaking strength between sterilized and control. Ethylene oxide and autoclave sterilized Prolene suture fibers, however, showed statistically (p less than 0.05) consistently lower tensile breaking strength than their unsterilized controls.(ABSTRACT TRUNCATED AT 250 WORDS) PMID:10148624

Chu, C C; Pratt, L; Zhang, L; Hsu, A; Chu, A

1993-01-01

5

Reaction of the urinary tract to polypropylene sutures.  

UK PubMed Central (United Kingdom)

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

Bartone FF; Stinson W

1976-07-01

6

Reaction of the urinary tract to polypropylene sutures.  

Science.gov (United States)

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

Bartone, F F; Stinson, W

1976-07-01

7

Lower eyelid suspension using polypropylene suture for the correction of punctal ectropion.  

UK PubMed Central (United Kingdom)

OBJECTIVE: To evaluate the efficacy and complications of lower eyelid suspension with the modified Safdarjung hospital technique using 5:0 polypropylene suture for punctal ectropion. STUDY DESIGN: Prospective case series. METHOD: Thirty one eyelids in 19 patients with mild and moderate ectropion and all types of laxity including involutional and paralytic were included. All patients underwent lower eyelid suspension with the modified Safdarjung hospital technique. A 5:0 polypropylene suture was passed in the pre-tarsal plane between the attachments of the lateral and medial canthal tendons near their insertion at the orbital rim. Successful outcome was judged by the anatomical restoration of the apposition of the punctum to the globe in the upward gaze and the physiological relief of epiphora. The recurrence of lid laxity, overall lid/globe apposition and complications were also noted. RESULTS: At 1 year follow up anatomical success was achieved in 28 (90%) patients and functional success noted in 27 (87%) patients. Recurrence of lid laxity was noted in 2 patients. There was a suture exposure in one case and a suture granuloma in another case. The results did not correlate to the degree of ectropion and type of laxity. CONCLUSION: Lower eyelid suspension using 5:0 polypropylene suture is a useful procedure for the treatment of involutional and paralytic punctal ectropion. It is simple and effective with minimal complications. However, the effect on scleral show and the concern related to suture material biodegradation over years needs to be further evaluated.

Goel R; Kamal S; Bodh SA; Kumar S; Kishore J; Malik KP; Singh M; Bansal S

2013-10-01

8

Repair of Iridodialysis Using 8-0 Polypropylene.  

UK PubMed Central (United Kingdom)

Abstract Purpose: Investigate the effectiveness of repair of iridodialysis with 8-0 polypropylene. Methods: We present four cases of traumatic iridodialysis that were repaired by 8-0 polypropylene suture. Results: Better iris reposition and stability were achieved with 8-0 polypropylene suture despite wide degree traumatic iridodialysis in all patients. Conclusion: In this study, we used 8-0 polypropylene suture, which is thicker, cheaper, and more durable than 10-0 sutures. We suggest that usage of 8-0 polypropylene sutures may provide better iris repositioning.

Da?lio?lu MC; Co?kun M; Ilhan N; Ayintap E; Tuzcu EA; Ilhan O; Oksüz H

2013-07-01

9

The practice of knots untying technique using a 10-0 nylon suture and gauze to cope with technical difficulties of microvascular anastomosis.  

UK PubMed Central (United Kingdom)

INTRODUCTION: We report a training technique of microvascular anastomosis readily accessible for trainees engaged in busy day-to-day clinical practice. METHOD: A table-top microscope is prepared on a table and 10-0 nylon suture (nonsterile) is used to tie two adjacent gauze fibers to form successive knots. In a second step, the knots are untied using the suture needle, which we call the knots untying technique (KUT). As the tied knots face different directions, it is difficult to guide the needle accurately through the knots without damaging or breaking the suture. And to untie all the knots within a certain time period, high controllability is required. RESULTS: The practice of KUT will allow surgeons to improve their ability to accurately guide the needle from any direction and carry out precise suturing swiftly, which will prevent vascular wall dissection during microvascular anastomosis or inability to guide the needle to a target point because of physiologic tremor. CONCLUSIONS: In our experience of training young neurosurgeons, practice of KUT contributes to shortening the duration of blood-flow blockage and helps mastering the technique of successful microvascular anastomosis.

Indo M; Tsutsumi K; Shin M

2011-01-01

10

Small Bowel Wall Response to Enterotomy Closure with Polypropylene and Polyglactin 910 Using Simple Interrupted Suture Pattern in Rats  

Directory of Open Access Journals (Sweden)

Full Text Available Effects of polypropylene and polyglactin 910 on enterotomy wound healing were investigated. Sixteen adult W istar albino rats (155.44±30.4 g) w ere randomized into two study groups, A with polypropylene (n = 8) and B with polyglactin 910 (n = 8) following 1 cm mid-jejunal enterotomy incisions performed under ketamine/xylazine anaesthesia. Body weights changes were evaluated daily for eleven days and two rats from each group were euthanized at postoperative days 3, 5, 7 and 11. Following euthanasia, the enterotomy sites were examined for dehiscence and adhesion. Evidence of inflammatory reactions and fibroblast proliferation were also evaluated and scored. Leaks from enterotomy site were not observed. Adhesion scores in-group A (3.5) was statistically significant (p0.05) but higher fibroblasts count was recorded in Group A (2.625) compared with group B (1.375). Inflammatory responses in both groups were not statistically significant, although that of Group B was higher in response than group A. Enterotomy closure with polypropylene produced significant adhesion that may be linked with the texture of the suture, and the several knots characteristic of the simple interrupted suture pattern.

Eyarefe O. David; S.A. Amid

2010-01-01

11

Polypropylene; Polypropylene  

Energy Technology Data Exchange (ETDEWEB)

Basell has signed an agreement with the Saudi Sahara Petrochemical firm for the construction of a polypropylene plant of 450000 t/year at Al-Jubail (Saudi Arabia). This project plans the construction of a propane dehydrogenation unit too. These two units should start at the end of the year 2007. (O.M.)

Anon.

2004-12-01

12

Polypropylene; Polypropylene  

Energy Technology Data Exchange (ETDEWEB)

Sumitomo Chemical is setting up a Chinese joint-venture for polypropylene compounds with Tokyo Ink. Located at Zhuhai (province of Guangdong), it should dispose, when it will start in the middle of 2006, of a capacity of 10000 t/year, with the possibility to double this capacity later on. The co-firm, Sumikaa Polymer Compounds, will be hold at 55% by Sumitomo and at 45% by Toyo Ink. (O.M.)

Anon.

2005-04-01

13

Argon endolaser suture lysis  

Science.gov (United States)

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

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

1996-05-01

14

Ureteral reaction to suture material.  

UK PubMed Central (United Kingdom)

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

Smith MW; Bartone FF; Tan EC; Gardner PJ

1983-03-01

15

Ureteral reaction to suture material.  

Science.gov (United States)

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

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

1983-03-01

16

Single-suture scleral fixation of subluxated foldable intraocular lenses.  

UK PubMed Central (United Kingdom)

PURPOSE: To evaluate the results of single-suture scleral fixation of subluxated foldable intraocular lenses (IOL) in eyes with sufficient residual capsular support. METHODS: The results of IOL repositioning by single-suture scleral fixation in 6 eyes of 6 patients with IOL subluxation were included. All subluxated IOLs were single-piece hydrophilic acrylic. Subluxation resulted from posterior capsule tears in 3 eyes, zonular dialyses in 2 eyes, and zonular dialysis with a capsulorhexis tear in 1 eye. A similar technique was used in all eyes in which one haptic was externalized through a superior clear corneal incision and tied with a Pair-PAK 10-0 polypropylene suture, and was finally retracted and fixated behind the iris close to the ciliary sulcus at the 12:00 meridian. All patients were followed up for at least 6 months. RESULTS: Best-corrected visual acuities ranged between finger counting and 20/70 (mean logMAR 1.02±0.64) preoperatively, and between 20/100 and 20/20 (mean logMAR 0.22±0.26) at the final postoperative visit. All IOLs remained centered and no significant postoperative complications were encountered except for an IOL tilt which resulted in a considerable oblique astigmatism in one eye. CONCLUSIONS: Subluxated foldable IOLs may safely be repositioned and secured with a single scleral fixation suture in selected cases with adequate amount of capsular remnants.

Yarangumeli A; Alp MN; Kural G

2012-07-01

17

Small incision single-suture-loop pupilloplasty for postoperative atonic pupil.  

Science.gov (United States)

In this small incision technique to correct postoperative atonic pupil in the aphakic or pseudophakic eye, the pupil is sutured and constricted with a 10-0 polypropylene loop through 3 1.0 mm stab incisions. The surgery is easier to perform than previous methods, appears safe and reproducible, and requires little special equipment. Although the pupil's shape may become slightly irregular, its size is fairly easy to regulate. This new method should be useful in correcting postoperative atonic pupil, and the small incision technique will likely minimize surgical trauma and induced astigmatism. PMID:9818329

Behndig, A

1998-11-01

18

Small incision single-suture-loop pupilloplasty for postoperative atonic pupil.  

UK PubMed Central (United Kingdom)

In this small incision technique to correct postoperative atonic pupil in the aphakic or pseudophakic eye, the pupil is sutured and constricted with a 10-0 polypropylene loop through 3 1.0 mm stab incisions. The surgery is easier to perform than previous methods, appears safe and reproducible, and requires little special equipment. Although the pupil's shape may become slightly irregular, its size is fairly easy to regulate. This new method should be useful in correcting postoperative atonic pupil, and the small incision technique will likely minimize surgical trauma and induced astigmatism.

Behndig A

1998-11-01

19

Outcome of conjunctival autograft sutured with polyamide black sutures in pterygium surgery.  

UK PubMed Central (United Kingdom)

Introduction: Pterygium excision with conjunctival autografting is the most effective way of treating pterygium with the least recurrence rate. The sutures which can be used to suture the conjunctival autograft are absorbable polyglactin 10-0 sutures or nonabsorbable polyamide 10-0 sutures. The polyamide sutures are inert, elicit minimal acute inflammatory reaction, do not support infection and allow easy removal without tissue adherence. They are very cost-effective compared to polyglactin sutures. Objective: This study was aimed to assess the efficacy of the cost-effective polyamide sutures in terms of patient comfort, graft stability, need for suture removal and recurrence. Materials and methods: In this prospective, non-comparative study, 56 eyes of 56 patients with primary pterygium underwent pterygium excision with conjunctival autograft transplantation sutured with 10-0 polyamide black sutures. The patients' comfort, graft stability, need for suture removal and recurrence were assessed within a mean follow- up period of 28.75 months (range 47 - 14 months). Results: Mild discomfort was found in 14 (25 %) patients for up to 3 weeks, moderate discomfort in 8 (14.2 %) for up to 1 week, no patients had severe discomfort beyond the first day, and all patients were comfortable at the end of the sixth post-operative week. The graft was stable in all patients. Nine sutures in 5 patients out of 392 sutures in 56 patients, that is, 2.29 % of the sutures, needed to be removed at the end of the sixth post-operative week. Two patients, or 3.57 %, had a recurrence. Conclusion: In pterygium surgery, suturing the conjunctival autograft with cost-effective polyamide black sutures is efficient and safe.

Kavitha CV

2013-01-01

20

Controlled-tension suture-tying forceps.  

UK PubMed Central (United Kingdom)

Suture-tying forceps have been designed to enable surgeons to tie consecutive sutures to the same tension to create an evenly compressed wound. The tensioning effect of the forceps was tested by tying a suture to the end of a cantilever beam strain-gauge device. Three sutures were used: 10/0 nylon, 8/0 polyglactin (Vicryl) and 8/0 virgin silk. The tests were repeated, coating the tips with citrated blood, sodium hyaluronate and saline. Adjustment of the forceps altered the suture tension in 0.015-N steps. Sterilization of the forceps by ethylene oxide or by an autoclave caused no obvious regression in the forceps performance. When the suture and surface lubricant remain constant, there is a linear relationship between forceps setting and the tension induced in the suture.

Talbot EM; Thorpe AW; Mushtaq I

1991-10-01

 
 
 
 
21

Endoscopic suturing.  

UK PubMed Central (United Kingdom)

We describe the development of endoscopic sewing machines and ancillary equipment for knot tying and thread cutting. We outline the experimental studies in dogs, pigs and baboons prior to the first studies in man. We consider the early results achieved by groups in Europe and the U.S.A., and present the available evidence from peer-reviewed studies and data from numerous abstracts on the use of endoscopic suturing in man for treating gastro-oesophageal reflux. We consider the limitations of the available studies, and outline the requirements for improvements in flexible endoscopic suturing methods.

Swain P; Park PO

2004-02-01

22

Endoscopic suturing.  

UK PubMed Central (United Kingdom)

Suturing at flexible endoscopy might extend the range of less invasive surgical procedures that can be performed without incision. The development of sewing machines that can place single and multiple stitches in the gastrointestinal tract is outlined. Methods of tying knots and cutting thread at flexible endoscopy have also been developed. The results of some applications, including the treatment of gastro-oesophageal reflux disease, the closure of perforations, haemostasis, and the attachment of feeding tubes and radiotelemetry capsules to tissue using endoscopic suturing, are described.

Swain CP

1999-04-01

23

Electron beam sterilization surgical sutures, 2  

International Nuclear Information System (INIS)

Possibility of electron beam (1.5 MeV, Van de Graaff accelerator) sterilization of a polypropylene surgical suture was examined from the points of sterilization effect and material degradation by the reason of that ? ray sterilization has not been permitted of its high degree of degradation. The D values of B. pumilus ATCC 27142 dry spores were determined to be 0.11 x 104 Gy in air and 0.18 x 104 Gy under the nitrogen stream irradiation, and the sterilization doses for electron beam were calculated to be 1.6 x 104 Gy in air and 2.7 x 104 Gy under the nitrogen stream, corresponding to ? ray sterilization assurance level of 2.5 x 104 Gy. Tensile strength of the polypropylene suture was 95 % of original strength soon after electron beam irradiation in air and was changed to be 81 % after 6 months storage, this is within the limit of the recommended value of 80 %. Furthermore, heat treatment (85 deg C, 1 hr.) following irradiation reduced degradation of irradiated polypropylene: its tensile strength was 93 % soon after irradiation but 97 % after 6 months. In the case of irradiation under the nitrogen stream, tensile strength after 6 months storage was 73 % without heat treatment, but 93 % with heat treatment. Based on the above results, we concluded that electron beam sterilization is applicable to the polypropylene surgical suture used in this experiment and heat treatment successive irradiation is effective to restrain material degradation. (author).

1986-01-01

24

Effect of suture material on platelet deposition onto prosthetic material  

Energy Technology Data Exchange (ETDEWEB)

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

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

1988-07-01

25

Suturing device  

UK PubMed Central (United Kingdom)

Improved medical suturing devices, systems, and methods may hold a suture needle at a fixed location relative to a handle of the device, allowing the surgeon to grasp and manipulate the handle of the suturing device to insert the needle through tissues in a manner analogous to use of a standard needle gripper. Cycling the handle from a closed position to an open position and back to the closed position may alternate the device between gripping the needle with a first clamp (for example, along a proximal portion of the needle) to gripping the needle with a second clamp (for example, along a distal portion of the needle) and optionally back to gripping with the first clamp, with the needle often staying at a substantially fixed location relative to the suturing device body. Related single-clamp needle grasping devices can be bent plastically by a surgeon, and/or have bodies that are grasped by a hand while a portion of the hand actuates a handle.

HAMILTON HENRY H; BELMAN YURI; ZATYURYUKIN ALEXANDER BORISOVICH; MOORE PATRICIA A

26

Polypropylene ligatures as a means of controlling intraocular pressure with Molteno implants.  

UK PubMed Central (United Kingdom)

A technique for controlling intraocular pressure in the immediate postoperative period with Molteno implants is described. Filtration tubes were closed with polypropylene sutures in 13 patients. Filtration tubes closed with 7-0 sutures provided the most satisfactory partial to complete lumen closure. The ligatures in six patients later were opened by argon laser.

Price FW Jr; Whitson WE

1989-11-01

27

Scleral necrosis secondary to nonabsorbable suture following ptosis surgery.  

Science.gov (United States)

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

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

2013-09-01

28

VASCULAR SUTURING DEVICE  

UK PubMed Central (United Kingdom)

A surgical device for suturing vascular vessels is described, as well as methods for suturing tissue employing the surgical device. The device includes a distal member for insertion into a vascular vessel puncture wound. The distal member contains a suture and needle engaging fitting. At least one needle is advanced through tissue adjacent the puncture wound and into the needle engaging fitting to draw lengths of suture material which can then be used to close the puncture wound.

PANTAGES ANTHONY J; ELLINGWOOD BRIAN A; WALBERG ERIK K

29

New-Fangled Slowly-Absorbable versus Non-Absorbable Sutures for Abdominal Fascial Closure. Have the Goals towards an Advantageous Suture Been Met?  

Directory of Open Access Journals (Sweden)

Full Text Available Background-Aim: The technique of abdominal closure along with the material to be used is constantly evolving. The aim of the present study is to evaluate differences in midline laparotomy closure with a standard closure technique and new-fangled slow-absorbable versus non-absorbable sutures. Material and Methods: A prospective, comparative study of patients undergoing laparotomy closure with either STARDIOX (Polydioxanone) or STARLENE (Polypropylene) sutures during a 9 month period was performed. Patients were evaluated and compared in terms of surgical site infection, incisional hernia, burst abdomen, and suture sinus formation. Results: A total of 284 patients were included [141 in the STARDIOX (Polydioxanone) group and 143 in the STARLENE (Polypropylene) group]. Sinus formation was not noticed and no palpable knots were reported in both groups. Moreover burst abdomen was never encountered. Incisional hernia rates were similar for both suture materials: n = 6 (4.3%) for the STARDIOX (Polydioxanone) group and n = 5 (3.5%) for the STARLENE (Polypropylene) group. There was not statistically significant relationship between the type of suture that was used and wound infection: n = 5 (3.5%) in the STARDIOX (Polydioxanone) group and n = 6 (4.2%) in the STARLENE (Polypropylene) group. Complications did not occur in 96.1% of all patients. Conclusions: Our study suggests that there are no significant differences between these two new-fangled sutures. It seems that progress of suture materials has led to a step towards the goals of a beneficial suture and from then on complications of surgical wound closure should be merely a matter of operative technique.

Georgios Anthimidis; Marios Gregoriou; Thomas Stavrakis; Kalliopi Vasiliadou; Ioannis Lyras; Kostas Ioannidis; George Basdanis

2013-01-01

30

Mechanics of Suture Joints  

Science.gov (United States)

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

Li, Yaning; Song, Juha; Ortiz, Christine; Boyce, Mary

2011-03-01

31

Comparison of synthetic glues and 10-0 nylon in rabbit lamellar keratoplasty.  

UK PubMed Central (United Kingdom)

PURPOSES: To evaluate changes in mean keratometry and to compare wound repair with corneal lamellar grafts in rabbit eyes using human synthetic tissue adhesives and 10-0 nylon. METHODS: Corneal grafts were made using a 6.0-mm-diameter trephine and blades in the eyes of 15 New Zealand white rabbits. Human fibrin tissue adhesive (Tisseel) was used in group 1, human fibrin tissue adhesive (Beriplast P) was used in group 2, polyethylene glycol adhesive (Coseal) was used in group 3, and 8 bite sutures with 10-0 nylon were used in group 4 (control) for lamellar keratoplasty. Four bite sutures were made with 10-0 nylon in groups 1, 2, and 3. Slit-lamp microscopy and keratometry were performed at 3 days and 1, 2, and 4 weeks after the surgery. Histopathologic and electromicroscopic examinations were performed 4 weeks after the surgery. RESULTS: No inflammation or corneal toxicity was seen in groups 1 and 2. Histologically, a few inflammatory cells were seen in groups 3 and 4. Groups 1, 2, and 3 showed no statistically significant changes in mean keratometry at 4 weeks postoperatively compared with preoperative mean keratometry (Wilcoxon signed-rank test, P = 0.178, 0.208, and 0.889, respectively). The control group showed significant changes in mean keratometry at 4 weeks postoperatively (Wilcoxon signed-rank test, P = 0.018). CONCLUSIONS: Human fibrin tissue adhesives were well tolerated in rabbit eyes, with no apparent corneal toxicity. Polyethylene glycol adhesive showed more inflammation and insufficient wound repair compared with human fibrin tissue adhesives. Therefore, human fibrin tissue adhesives can be used as an alternative to sutures in lamellar keratoplasty.

Cho SY; Kim MS; Oh SJ; Chung SK

2013-09-01

32

Sutures and suture anchors: update 2003.  

UK PubMed Central (United Kingdom)

PURPOSE: The purpose of this study was to evaluate recently introduced sutures and suture anchors for single-pull load-to-failure strength and failure mode. TYPE OF STUDY: Experimental laboratory biomechanical study. METHODS: Using an established protocol in fresh porcine femurs, anchors were tested in diaphyseal cortex, metaphyseal cortex, and cancellous troughs after threading them with either steel sutures or strong synthetic material to reduce the likelihood of suture breakage as a mode of failure. An Instron machine (Instron, Canton, MA) applied tensile loads parallel to the axis of insertion at a rate of 12.5 mm/second until failure, and mean anchor failure strengths were calculated. Mode of failure was recorded (anchor pullout, suture eyelet cutout, or wire breakage). Anchors tested included the RotorloC (Smith & Nephew Endoscopy, Andover, MA), TwinFix Ti 3.5, TwinFix Ti 5.0, and TwinFix AB (Smith & Nephew Endoscopy), Super Revo and UltraSorb (Linvatec, Largo, FL), Duet (Bionx Implants, Blue Bell, PA), AlloAnchor RC (Regeneration Technologies, Alachua, FL), Opus Magnum anchor (Opus Medical, San Juan Capistrano, CA), and the BioCorkscrew 5.0 and BioCorkscrew 6.5 (Arthrex, Naples, FL). Sutures tested were No.2 and No. 5 Ethibond (Ethicon, Somerville, NJ), No. 2 Panacryl (Mitek, a division of Ethicon, Somerville, NJ), and Nos. 2, 5, and 2-0 Fiberwire (Arthrex, Naples, FL). RESULTS: The sutures all broke in the midpoint of their tested strand away from the grips. The No. 2 Ethibond failed at a mean of 21 lb (92 N); No. 5 Ethibond failed at a mean of 44 lb (193 N); No. 2, No. 5, and No. 2-0 Fiberwire at means of 44 lb (188 N), 112 lb (483N), and 19 lb (82 N), respectively; and No. 2 Panacryl at a mean of 22 lb (99 N). The suture anchors all failed at levels higher than the associated sutures. CONCLUSIONS: Screw anchors showed higher load to failure values than nonscrew designs, and the new biodegradable anchors showed failure loads lower than the anchors. All anchors were stronger than the suture for which they are designed.

Barber FA; Herbert MA; Richards DP

2003-11-01

33

Effect of suturing the silicone rod to the tarsal plate and the suture material used on success of frontalis suspension surgery.  

UK PubMed Central (United Kingdom)

PURPOSE: To evaluate the effect of suturing the silicone rod to the tarsal plate and the suture material used in suturing on surgical success of frontalis suspension for congenital ptosis. METHODS: Eighty eyes of 56 consecutive patients who underwent frontalis suspension surgery using silicone rods for congenital ptosis between 2005 and 2011 were included in this retrospective study. The surgical results of eyes were compared, in which silicone had not been sutured to the tarsal plate (group 1), with those sutured with monofilament polypropylene suture (group 2), and those sutured with polybutylate-coated braided polyester suture (group 3). Surgical success indicated that the postoperative eyelid position was maintained within 1 mm of the normal eyelid position, that is, 1 mm below the superior limbus in bilateral cases and the same level with the other eyelid in unilateral cases, in the primary position of gaze. Postoperative eyelid level beyond these limits was defined as surgical failure. RESULTS: The mean follow up was 16.3 months (6-38 months) and the mean age was 5.48 years (1-24 years). Thirty were male and 26 were female patients. Surgical failure occurred in 9 of 18 (50%) cases in group 1, in 5 of 24 (20.8%) cases in group 2, and in 5 of 38 (13%) cases in group 3 during the follow-up period after adequate eyelid elevation had been achieved just after the operation. The difference between surgical success rates in group 1 and group 2 (p = 0.047) and group 1 and group 3 (p = 0.003) was statistically significant. However, the difference between group 2 and group 3 did not reach statistical significance. CONCLUSIONS: Suturing the silicone rod to the tarsal plate increases the surgical success rates of frontalis suspension surgery for congenital ptosis. Suturing with polybutylate-coated braided polyester, even though statistically insignificant, seems to be more effective than suturing with monofilament polypropylene.

Buttanri IB; Serin D; Karslioglu S; Akbaba M; Ari S; Fazil K

2013-03-01

34

SUTURING AND LIGATING METHOD  

UK PubMed Central (United Kingdom)

A manipulator includes a distal-end working unit having a rolling mechanism and an opening and closing mechanism. A forceps includes a gripper on a distal end thereof. A curved needle of a suture-needle assembly is inserted through an incision in a body cavity within a living body, while leaving a portion of a suture strand of the suture-needle assembly uninserted in the tissue. The gripper grips the curved needle. The suture strand is wound around the gripper a predetermined number of times by turning a proximal end portion of the curved needle with the rolling mechanism. The gripper grips the portion of the suture strand, which has not been inserted into the tissue. The gripper is then withdrawn through loops of the suture strand, which are wound around the gripper. The distal-end working unit and the gripper are moved relatively to each other in order to form a knot across the incision.

MILAD MAGDY P; SHIMOYAMA PARI; OMORI SHIGERU; HIRZEL DEANNA

35

Suture materials and techniques.  

UK PubMed Central (United Kingdom)

Surgical improvements in periodontics have been achieved because of advances in basic science, animal and clinical research, and the insight of outstanding clinicians. Industry continues to develop new surgical materials, improving the quality of sutures and needles and in turn, supporting advances in all surgical specialties. The purpose of this article is to review sutures and suturing by focusing on both materials and methods as they relate to the present practices of surgical periodontics and dental implants.

O'Neal RB; Alleyn CD

1997-01-01

36

Growing Cava Vein Anastomosis: Comparison of Cross-Clamping and Suture Times Using VCS Metallic Clips, Interrupted Nonabsorbable, or Continuous Absorbable Suturing Techniques.  

UK PubMed Central (United Kingdom)

BACKGROUND: The latest generation in titanium clip application systems, the AnastoClip Vessel Closure System (VCS; LeMaitre Vascular, Burlington, MA), allows surgeons to perform vascular anastomosis more easily and faster than conventional sutures. This system may become the option of choice for vascular reconstruction in pediatric surgery where, as in the case transplant surgery, decreasing vascular occlusion times may influence outcome. The aim of this study was to determine whether VCS metallic clips would allow shorter anastomosis times than conventional interrupted polypropylene or running polyglycolic acid suturing in end-to-end anastomosis performed in the abdominal cava of young pigs. METHODS: Thirty-two domestic swine, 45 days old, were used for this study. All animals were subjected to an end-to-end anastomosis in the abdominal cava. RESULTS: VCS clips are easier to use for the surgeon, significantly decreasing cross-clamping time in caval anastomosis (VCS 10.33 ± 1.75 min vs. interrupted polypropylene sutures 46.00 ± 6.16 min vs. continuous polyglycolic acid sutures 18.16 ± 1.47 min). CONCLUSIONS: VCS clips significantly decrease the time needed for performing an end-to-end anastomosis in the abdominal cava, decreasing cross-clamping time when compared to interrupted polypropylene or running polyglycolic acid sutures.

Calles-Vázquez MC; Abellán Rubio E; Crisóstomo Ayala V; Usón Gargallo J; Sánchez Margallo FM

2013-10-01

37

Physicomechanical evaluation of polypropylene, polyester, and polytetrafluoroethylene meshes for inguinal hernia repair.  

UK PubMed Central (United Kingdom)

BACKGROUND: For meshes to be used effectively for hernia repair, it is imperative that engineers and surgeons standardize the terminology and techniques related to physicomechanical evaluation of these materials. The objectives of this study were to propose standard techniques, perform physicomechanical testing, and classify materials commonly used for inguinal hernia repair. STUDY DESIGN: Nine meshes were evaluated: 4 polypropylene, 1 polyester, 1 polytetrafluoroethylene, and 3 partially absorbable. Physical properties were determined through image analysis, laser micrometry, and density measurements. Biomechanical properties were determined through suture retention, tear resistance, uniaxial, and ball burst testing with specimens tested in 2 different orientations. A 1-way ANOVA with Tukey's post-test or a t-test were performed, with p < 0.05. RESULTS: Significant differences were observed due to both mesh type and orientation. Areas of interstices ranged from 0.33 ± 0.01 mm² for ProLite (Atrium Medical Corp) and C-QUR Lite (Atrium Medical Corp) Large to 4.10 ± 0.06 mm² for ULTRAPRO (Ethicon), and filament diameters ranged from 99.00 ±8.1 ?m for ProLite Ultra (Atrium Medical Corp) and C-QUR Lite Small to 338.8 ± 3.7 ?m for Parietex Flat Sheet TEC (Covidien). These structural characteristics influenced biomechanical properties such as tear resistance and tensile strength. ProLite Ultra, C-QUR Lite Small, ULTRAPRO and INFINIT (WL Gore & Associates) did not resist tearing as effectively as the others. All meshes exhibited supraphysiologic burst strengths except INFINIT and ULTRAPRO. CONCLUSIONS: Significant differences exist between the physicomechanical properties of polypropylene, polyester, polytetrafluoroethylene, and partially absorbable mesh prostheses commonly used for inguinal hernia repair. Orientation of the mesh was also shown to be critical for the success of meshes, particularly those demonstrating anisotropy.

Deeken CR; Abdo MS; Frisella MM; Matthews BD

2011-01-01

38

PERFORATION SUTURING METHOD  

UK PubMed Central (United Kingdom)

A perforation suturing method has the steps of: inserting a needle into a wall of a hollow organ at a periphery of the perforation formed in the hollow organ, and piercing the wall withdrawing the needle from the wall after delivery of an anchor attaching suture thread from the needle, and having the suture thread transit the wall and tightening the suture thread so that the mated insertion points at the time of insertion of the needle into the wall approximately coincide after having the needle pierce the wall at the periphery of the perforation a plurality of times, and making surfaces of the wall where the insertion points are formed coincide with each other.

MIKKAICHI TAKAYASU; IWASAKA MASAYUKI; KAJI KUNIHIDE

39

Surgical pouched suturing device  

UK PubMed Central (United Kingdom)

The utility model relates to a purse-string suture for surgery, belonging to the technical field of medical appliance, which comprises an upper pin chamber and a lower pin chamber, an upper clamp seat and lower clamp seat, a clamp seat connecting rod and a handle wherein, the pin chambers are arranged in the clamp seats, the clamp seats, the clamp seat connecting rod and the handle are molded together and teeth are disposed on a sutural surface of the pin chambers. The height of the teeth is higher than 1.2mm and lower and equal to 1.7mm. The tissues clamped in the middle are sawtooth wave shaped when the upper and lower pin chambers are folded. By using the purse-string suture, the contact surface of the pin chambers and human tissues can be effectively enlarged, the issues cannot flow out during the purse-string suture and the purse can be completely formed.

WANGDONG CHEN; KEZHAN SUN

40

Radiation degradation of polypropylene  

International Nuclear Information System (INIS)

Post-irradiation degradation of isotactic polypropylene irradiated by Co60-?-ray has been followed for 12 months. Effects of irradiation doses (10 - 100 kGy) up on the change of the structure and mechanical properties as well as flowability of this polymer have been studied. Carbonyl index increases with increasing post-irradiation time. This rate was much higher for doses above 50 kGy. Tensile strength declines with time and those samples irradiated above 50 kGy become quite brittle, just after irradiation. Results reveal that post-irradiation degradation of polypropylene irradiated by ?-ray occurs via chain scission mechanism. (author).

1993-01-01

 
 
 
 
41

Evaluation of transconjunctival frontalis suspension using nonabsorbable suture.  

UK PubMed Central (United Kingdom)

PURPOSE: To evaluate the transconjunctival frontalis suspension technique using nonabsorbable suture (4/0 polypropylene) in patients with severe blepharoptosis and poor levator function. METHODS: A total of 22 patients (33 ptotic eyelids) were included in a prospective interventional case series study. All had severe ptosis with poor levator function. Transconjunctival frontalis suspension using 4/0 polypropylene suture was done in all patients. RESULTS: Twelve patients (17 eyelids) had congenital ptosis, 6 patients (12 eyelids) had blepharophimosis, and 4 patients (4 eyelids) had traumatic ptosis. The surgical technique was easy and fast and surgical results in the 3 groups were good functionally and cosmetically. Recurrences in 3 eyelids (9%) happened after 3 years. Follow-up ranged from 1 to 4 years. CONCLUSIONS: Transconjunctival frontalis suspension technique is simple and time saving for treatment of severe ptosis with poor levator function. It gives good functional and cosmetic results. Healing was normal with no postoperative swelling or infection. 4/0 Polypropylene exhibits satisfactory results and easy manipulation.

Gawdat TI; Elsayed SF; Salah El-Din YM; Kamel HF

2010-03-01

42

Fiber reinforced polypropylene nanocomposites  

Digital Repository Infrastructure Vision for European Research (DRIVER)

The aim of this thesis is to assess the feasibility of integrating nanoparticles into glass fiber (GF) reinforced isotactic polypropylene (iPP) composites via existing thermoplastic processing routes, and to investigate whether this results in significant improvements in the mechanical properties of...

Houphouet-Boigny, Chrystèle

43

Suspension of the gluteal region with silhouette sutures.  

Science.gov (United States)

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

de Benito, Javier; Pizzamiglio, Roberto

2013-09-01

44

BAM R10: 0.04% Bromthymol Blue Indicator  

Science.gov (United States)

... BAM R10: 0.04% Bromthymol Blue Indicator. January 2001. Bacteriological Analytical Manual. R10 Bromthymol Blue Indicator, 0.04%. ... More results from www.fda.gov/food/foodscienceresearch/laboratorymethods

45

Incorporating barbed sutures in abdominoplasty.  

UK PubMed Central (United Kingdom)

Barbed sutures can be used in body contouring procedures to close long incisions better than conventional sutures. The results of a literature review focusing on the use of barbed sutures in abdominal contouring procedures suggest that they are safe and effective in wound closure with complication rates similar to conventional sutures but with possibly faster incision-closure times. An update on one author's (K.A.G.) personal experience with barbed progressive tension sutures in abdominoplasty procedures is presented, along with practical technique recommendations for barbed suture use.

Gutowski KA; Warner JP

2013-09-01

46

Suture introducing device for operation suture needle  

UK PubMed Central (United Kingdom)

Disclosed is a surgery sewing needle threader which comprises a base, a casing and a block thread board are provided on the base, a thread hole is provided in the side casing, a pinhole is equipped on the top surface, a piano key switch is inserted in the casing, a slot is equipped between the casing and the block thread board, the piano key switch mainly comprises a lead key button and the connected lead key lever, a hanging wire key button and the connected hanging wire key lever, a bread board, a bottom board, a front interlock sheet and a back interlock sheet, a steel wire hook is provided in the front interlock sheet, a sewing needle is fixed into the pinhole, the steel wire hook can through the sewing needle pinhole and out of the thread hole by operated the hanging wire key button, the wire is hanged on the steel wire hook through the slot by the suture thread, the steel wire hook can through the sewing needle pinhole ,the suture thread hanged on the steel wire hook in negative direction at the same time through the sewing needle pinhole by the employing lead key button, the lead process can be finished, thereby, the sewing needle can be pulled out of the pinhole and the sewing operation can be done, the utility model has the advantages of high accuracy convenience rapid lead handling by the equipment and the nurse.

LI SHOUHUA ZHOU

47

New Technique of Intracorneal Ring Segments Suturing After Migration.  

UK PubMed Central (United Kingdom)

PURPOSE: To describe a new technique for suturing of the intracorneal ring segments to stabilize it in the proper location and to prevent recurrent displacement of the ring. METHODS: Two patients with recurrent ring segment migration toward the incision were treated with this new surgical technique between 2010 and 2013. The first case had Intacs ring (Addition Technology, Fremont, CA) and migration occurred 2 months after implantation. The second case had Keraring segment (Mediphacos, Belo Horizonte, Brazil) and migration occurred 1 week postoperatively. The ring segments were fixated to the cornea with a 10-0 nylon suture through the channel. The suture was removed at 1 month postoperatively. RESULTS: Ring segments remained in the desired location with a follow-up period of at least 6 months after implantation. CONCLUSIONS: This newly described ring suturing technique is an effective procedure that can be used to treat ring segment migration in the channel. [J Refract Surg. 20XX;XX(X):XX-XX.].

Jarade E; Dirani A; Fadlallah A; Antonios R; Cherfan G

2013-07-01

48

Selective suture cutting for control of astigmatism following cataract surgery  

Directory of Open Access Journals (Sweden)

Full Text Available Use of 10-0 monofilament nylon in ECCE cataract surgery leads to high with the rule astigmatism. Many intraoperative and post operative methods have been used to minimise post operative astigmatism. We did selective suture cutting in 38 consecutive patients. Mean keratometric astigmatism at three and six weeks post operative was 5.76 and 5.42 dioptres (D) respectively. 77.5% of eyes had astigmatism above 2 D. Selective suture cutting along the axis of the plus high cylinder was done after six weeks of surgery. Mean post suture cutting keratometric astigmatism was 3.3 D and 70% of the eyes had astigmatism below 2 D. After 3 months of surgery mean keratometric astigmatism was reduced to 1.84 D. Axis of the astigmatism also changed following suture cutting. 40% of the eyes showed improvement in their Snellen acuity following reduction in the cylindrical power.

Bansal R; Gupta Amod; Grewal SPS

1992-01-01

49

Radiosterilization of surgical suture materials  

International Nuclear Information System (INIS)

In addition to a historical survey, the paper deals with basic microbiological aspects of radiation sterilization, especially with regard to absorbable suture materials, and with the radiation effects on the physical, mechanical, chemical and biological properties of suture materials. Experimental and clinical experience with the application of radiosterilized suture materials is presented. The effects of irradiation on nonabsorbable suture materials, some materials for foil packaging and alcoholic preservative solutions are also discussed. (author)

1981-01-01

50

Barbed sutures in breast reconstruction.  

UK PubMed Central (United Kingdom)

Postoperative closure techniques in breast reconstruction have remained largely unchanged over the past 75 years, despite recent use of adhesives and subcuticular staples and the advent of self-anchoring barbed sutures. In this article, the author discusses the applications for barbed sutures in breast reconstruction and describes specific techniques. Innovations in barbed suture material are also described, and the author's personal experiences are presented in comparison with traditional suturing techniques.

Salzberg CA

2013-09-01

51

Comparative study of trabeculectomy using single sutures versus releasable sutures  

Directory of Open Access Journals (Sweden)

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

Matlach J; Hoffmann N; Freiberg FJ; Grehn F; Klink T

2012-01-01

52

Adjustable suture strabismus surgery  

Digital Repository Infrastructure Vision for European Research (DRIVER)

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 se...

Nihalani, B R; Hunter, D G

53

Trabeculectomy with releasable sutures.  

Digital Repository Infrastructure Vision for European Research (DRIVER)

We attempted to reduce some of the postoperative complications of trabeculectomy by using releasable scleral flap sutures. This technique allows an initial tight closure of the scleral flap with the option to increase aqueous humor outflow in the early postoperative period. We reviewed our experienc...

Kolker, A E; Kass, M A; Rait, J L

54

Cranial sutures: a multidisciplinary review.  

UK PubMed Central (United Kingdom)

INTRODUCTION: Progress in cranial suture research is shaping our current understanding of the topic; however, emphasis has been placed on individual contributing components rather than the cranial sutural system as a whole. Improving our holistic view helps further guide clinicians who treat cranial sutural abnormalities as well as researchers who study them. MATERIALS AND METHODS: Information from anatomy, anthropology, surgery, and computed modeling was integrated to provide a perspective to interpret suture formation and variability within the cranial functional and structural system. RESULTS: Evidence from experimental settings, simulations, and evolution suggest a multifactorial morphogenetic process associated with functions and morphology of the sutures. Despite molecular influences, the biomechanical cranial environment has a main role in both the ontogenetic and phylogenetic suture dynamics. CONCLUSIONS: Furthering our holistic understanding of the intricate cranial sutural system promises to expand our knowledge and enhance our ability to treat associated anomalies.

Di Ieva A; Bruner E; Davidson J; Pisano P; Haider T; Stone SS; Cusimano MD; Tschabitscher M; Grizzi F

2013-06-01

55

Releasable suture technique for trabeculectomy  

Directory of Open Access Journals (Sweden)

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

Jacob Pushpa; Thomas Ravi; Mahajan Anuradha; Mathai Annie; Gieser Stephen; Raju Renu

1993-01-01

56

Physical properties of novel polypropylenes  

Digital Repository Infrastructure Vision for European Research (DRIVER)

High molecular polypropylene (MW ~ 1,100,000 g/mol) was added to a matrix of polypropylene with an average molecular weight (MW ~ 250,000 g/mol). By blending both materials we tried to combine the respective advantages regarding stability and processability. The long chains from the high molecular ...

Fischer, Stefan

57

Microindentation of oriented polypropylene  

Science.gov (United States)

The thesis focuses on the measurement of conventional engineering mechanical properties like yield strength, and dynamic mechanical (viscoelastic) properties of polymers using microindentation. In order to obtain high spatial resolutions, a flat punch indenter with a relatively small diameter of 80 mum was used. The present work emphasizes anisotropic materials: in particular oriented polypropylene. The initial test material was prepared by two solid state forming processes: uniaxial tensile drawing at elevated temperatures, and channel die forming. The latter allowed for greater control of the deformation ratio during forming over a much wider range of tensile strains. The mechanism of deformation under the tip of the indenter was studied using optical microscopy of thin sections viewed in transmission. The deep penetration mechanism changed with direction of indentation relative to the orientation axis. The observations were consistent with the mechanisms observed for unidirectional fiber reinforced composites. In particular, when penetrated parallel to the orientation direction, sharply defined zones of deformation which were similar to kink bands seen in compressed composites were seen. Detailed analysis of this behaviour showed that a modified version of the kink band formation theories developed for fiber composites could be successfully applied to oriented polypropylene. To confirm this, experiments on oriented polypropylene were compared to similar experiments on unidirectional carbon fiber reinforced epoxy. The development of deformation during deep penetration could be monitored by using a dynamic mechanical test which measured the stress amplitude response to an applied oscillating strain. One possible interpretation of these experimental observations involved the progressive development of the kink band deformation structure as the indenter was pushed into the material. The results of the first part of the thesis were used in a practical application: namely the measurement of the gradient of mechanical properties in the near surface region of a processed polypropylene. For this, a novel processing method was developed in which a strain gradient was produced in the near surface region of the material. The tensile strain gradation resulted in a corresponding gradient in mechanical properties. The micro indentation dynamic mechanical test was used to measure this variation in near surface properties. The usefulness of the microindentation test to measure local variations in viscoelastic properties was thus demonstrated on a scale which is similar to that expected in many processed plastics.

Lo, James C. W.

58

First investigation of spider silk as a braided microsurgical suture.  

Science.gov (United States)

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

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

2011-03-22

59

First investigation of spider silk as a braided microsurgical suture.  

UK PubMed Central (United Kingdom)

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

Kuhbier JW; Reimers K; Kasper C; Allmeling C; Hillmer A; Menger B; Vogt PM; Radtke C

2011-05-01

60

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

Science.gov (United States)

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

 
 
 
 
61

Rectal obstruction after a vaginal posterior compartment polypropylene mesh fixed to the sacrospinous ligaments.  

UK PubMed Central (United Kingdom)

We present a case in which a polypropylene mesh was placed over the posterior vaginal wall and was fixed to the sacrospinous ligaments on both sides. Postoperative a rectal obstruction developed which was only resolved after splitting the entire mesh in the midline. It is hypothesised that the obstruction was due to the fixation of the mesh with irresolvable suture material to the sacrospinous ligaments acting as a hinge on which the bowel folded.

Vierhout ME; Withagen MI; Fütterer JJ

2011-08-01

62

The best suture for hypospadias?  

UK PubMed Central (United Kingdom)

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

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

1987-05-01

63

The best suture for hypospadias?  

Science.gov (United States)

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

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

1987-05-01

64

Analysis of adhesions resulted from mesh fixation with fibrin sealant and suture: experimental intraperitoneal model.  

UK PubMed Central (United Kingdom)

OBJECTIVE: To compare surgical fixation of polypropylene mesh (PP) and coated polypropylene mesh (PCD) using polypropylene suture and fibrin glue, as for the formation of intraperitoneal adhesions. METHODS: A sample of 46 female Wistar rats were randomized into six groups: two control groups, with five rats each, were subjected to one medial incision (MI) and the other to a U-shaped incision (UI), none of these groups received the mesh. Two groups of PP mesh, with ten rats, fixed with suture (PPF), the other with six rats, fixed with biological glue (PPC). And two groups of PCD mesh, at first, with ten animals, the mesh was fixed with sutures (PCDFs) and the second with ten animals with biological glue (PCDC). RESULTS: After 21 days, the control groups showed no significant adhesions. The PPC group showed a lower degree of adhesion than the PPF group (p = 0.01). There was no difference between the groups with PCD. CONCLUSION: Comparison of fixation was statistically different only with PP mesh, with lesser degrees of adherence when using the glue. Adhesions were predominantly located at the extremities of the meshes studied.

Montes JH; Bigolin AV; Baú R; Nicola R; Grossi JV; Loureiro CJ; Cavazzola LT

2012-12-01

65

Influence of suture regularity on corneal astigmatism after penetrating keratoplasty  

DEFF Research Database (Denmark)

Abstract. Purpose: To investigate whether suture regularity affects corneal astigmatism after keratoplasty. Methods: Twenty-one patients undergoing penetrating keratoplasty for various corneal diseases were included in the study. The grafts were sutured in place using a single-running Nylon 10-0 suture, taking 24 bites. Immediately after surgery, standard calibrated images of the grafted eye were captured and stored. Using a dedicated image analysis programme, stitches and needle points were identified, and a number of suture regularity variables were calculated. Corneal topographic images were obtained before suture removal (12 months after surgery) and 3 months after suture removal (18 months after surgery). Topographic measures of astigmatism [surface regularity (SRI), surface asymmetry index (SAI) and simulated keratometric astigmatism] were calculated and correlated with the computed suture regularity variables. Results: The average stitch length was 3.04 +/- 0.28 mm and the distance between the outer needle points was 2.53 +/- 0.09 mm. The SRI was 1.26 +/- 0.36 and the SAI was 1.59 +/- 0.67 after 12 months; these decreased to 1.03 +/- 0.48 and 0.92 +/- 0.46 after 18 months, respectively. Corneal astigmatism was 6.38 +/- 2.99 and 5.87 +/- 3.13 dioptres after 12 and 18 months, respectively. Suture regularity did not affect SAI, SRI or corneal astigmatism significantly 12 months after surgery. Eighteen months after surgery (3 months after suture removal), the standard deviation on the original stitch length was found to significantly increase corneal astigmatism. In addition, the size of the counter-clockwise angle between stitch and graft radian was correlated significantly with a lower SRI. Conclusion: The origin of corneal astigmatism after penetrating keratoplasty is multifaceted. Regular stitch length and stitch advancement on the surface appears to improve the optical quality of the graft after suture removal. Factors such as stitch depth, suture tension and variations in wound construction might also beimportant predictors of corneal astigmatism after penetrating keratoplasty.

Hjortdal, Jesper; SØndergaard, Anders

2011-01-01

66

Barbed sutures in body surgery.  

Science.gov (United States)

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

67

Barbed sutures in body surgery.  

UK PubMed Central (United Kingdom)

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.

Moya AP

2013-09-01

68

Compression suture of the abdominal wall: a controlled trial in 302 major laparotomies.  

Science.gov (United States)

Monofilament nylon suture material undergoes both plastic and elastic elongation when stretched. Nylon inserted as a continuous suture for approximation of the abdominal musculo-aponeurosis may, therefore, allow early separation of the cut edges, which may predispose to the later development of an incisional hernia. This hypothesis was tested in a consecutive series of 302 major laparotomies randomized to be sutured with continuous mass nylon either to approximate or to compress the deep layers. The incidence of incisional hernia at 6 months in the group sutured with normal tension was 10.0 per cent, compared with 5.5 per cent in those tightly sutured. There was, however, an increased rate of minor wound infection in the latter group. PMID:6456034

Mayer, A D; Ausobsky, J R; Evans, M; Pollock, A V

1981-09-01

69

Compression suture of the abdominal wall: a controlled trial in 302 major laparotomies.  

UK PubMed Central (United Kingdom)

Monofilament nylon suture material undergoes both plastic and elastic elongation when stretched. Nylon inserted as a continuous suture for approximation of the abdominal musculo-aponeurosis may, therefore, allow early separation of the cut edges, which may predispose to the later development of an incisional hernia. This hypothesis was tested in a consecutive series of 302 major laparotomies randomized to be sutured with continuous mass nylon either to approximate or to compress the deep layers. The incidence of incisional hernia at 6 months in the group sutured with normal tension was 10.0 per cent, compared with 5.5 per cent in those tightly sutured. There was, however, an increased rate of minor wound infection in the latter group.

Mayer AD; Ausobsky JR; Evans M; Pollock AV

1981-09-01

70

Releasable suture technique for trabeculectomy  

Directory of Open Access Journals (Sweden)

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

Thomas Ravi; Jacob Pushpa; Braganza Andrew; Mermoud Andre; Muliyil Jayaprakash

1997-01-01

71

Radiation effect on stabilized polypropylene  

Energy Technology Data Exchange (ETDEWEB)

Radiation-induced oxidative degradation of stabilized polypropylene films using Co-60 ..gamma.. irradiation at room temperature under different irradiation conditions (vacuum and oxygen) was investigated. Gas evolution, oxygen consumption, and mechanical properties were studied and analyzed quantitatively. The G values for the evolved gases during irradiation of stabilized polypropylene films under vacuum and in presence of oxygen are given. The stabilized polypropylene, irradiated at low doses under different conditions (air, oxygen, and vacuum), shows mechanical properties almost similar to those of the unirradiated one. However, at higher doses the mechanical properties were sharply decreased and deterioration was enhanced in the presence of oxygen due to the oxidative degradation. On the other hand, post-irradiation effect on the stabilized polypropylene irradiated up to 0.02 MGy under vacuum, was studied at various annealing temperatures and different storage time at room temperature. Molecular weight distribution curves for polypropylene samples irradiated in air atmosphere show that degradation of the high molecular weight chains is the predominant process in the range of irradiation doses under investigation.

Hegazy, E.-S.A.; Zahran, A.H.; Al-Diab, S.S.; Salama, J.

1986-01-01

72

Polypropylene in cars. Fortschritte mit Polypropylen im Kfz-Bereich  

Energy Technology Data Exchange (ETDEWEB)

Due to a good cost-benefit ratio and a wide range of possibilities for modification with elastomeres or reinforcing materials polypropylene is increasingly used in car manufacturing. The various possibilities of using polypropylene were discussed at a technical conference: inpact and opportunities of PP in car manufacturing, painting of external car parts, design of machined parts - tools - processing technology, PP-particle foam, PP-plastic films, weight reduction, recycling - solutions with TPO films, PP-textiles, manufacturing of sheets and panels for the passenger compartment by means of direct injection of decorative elements, direct laminations, extrusion-blown parts, long-fibre reinforced PP for high-stress applications. (BWI)

1993-01-01

73

Bacterial endophthalmitis after suture removal.  

UK PubMed Central (United Kingdom)

We present 3 cases of endophthalmitis following suture removal after cataract surgery. In all cases, prophylactic antibiotics had been used. Treatment included vitreous tap and intravitreal antibiotic injection, with only 1 of the 3 patients regaining good visual acuity. Because povidone-iodine 5% is more effective at decreasing conjunctival bacterial counts than topical antibiotics, we recommend this method of conjunctival preparation before suture removal.

Culbert RB; Devenyi RG

1999-05-01

74

Bacterial endophthalmitis after suture removal.  

Science.gov (United States)

We present 3 cases of endophthalmitis following suture removal after cataract surgery. In all cases, prophylactic antibiotics had been used. Treatment included vitreous tap and intravitreal antibiotic injection, with only 1 of the 3 patients regaining good visual acuity. Because povidone-iodine 5% is more effective at decreasing conjunctival bacterial counts than topical antibiotics, we recommend this method of conjunctival preparation before suture removal. PMID:10330655

Culbert, R B; Devenyi, R G

1999-05-01

75

New bactericidal surgical suture coating.  

Science.gov (United States)

This paper demonstrates the effectiveness of a new antimicrobial suture coating. An amphiphilic polymer, poly[(aminoethyl methacrylate)-co-(butyl methacrylate)] (PAMBM), inspired by antimicrobial peptides, was bactericidal against S. aureus in time-kill experiments. PAMBM was then evaluated in a variety of polymer blends using the Japanese Industrial Standard (JIS) method and showed excellent antimicrobial activity at a low concentration (0.5 wt %). Using a similar antimicrobial coating formula to commercial Vicryl Plus sutures, disk samples of the coating material containing PAMBM effectively killed bacteria (98% reduction at 0.75 wt %). Triclosan, the active ingredient in Vicryl Plus coatings, did not kill the bacteria. Further Kirby-Bauer assays of these disk samples showed an increasing zone of inhibition with increasing concentration of PAMBM. Finally, the PAMBM-containing coating was applied to sutures, and the morphology of the coating surface was characterized by SEM, along with Vicryl and uncoated sutures. The PAMBM-containing sutures killed bacteria more effectively (3 log(10) reduction at 2.4 wt %) than Vicryl Plus sutures (0.5 log(10) reduction). PMID:22877364

Li, Yan; Kumar, Kushi N; Dabkowski, Jeffrey M; Corrigan, Meagan; Scott, Richard W; Nüsslein, Klaus; Tew, Gregory N

2012-08-09

76

New bactericidal surgical suture coating.  

UK PubMed Central (United Kingdom)

This paper demonstrates the effectiveness of a new antimicrobial suture coating. An amphiphilic polymer, poly[(aminoethyl methacrylate)-co-(butyl methacrylate)] (PAMBM), inspired by antimicrobial peptides, was bactericidal against S. aureus in time-kill experiments. PAMBM was then evaluated in a variety of polymer blends using the Japanese Industrial Standard (JIS) method and showed excellent antimicrobial activity at a low concentration (0.5 wt %). Using a similar antimicrobial coating formula to commercial Vicryl Plus sutures, disk samples of the coating material containing PAMBM effectively killed bacteria (98% reduction at 0.75 wt %). Triclosan, the active ingredient in Vicryl Plus coatings, did not kill the bacteria. Further Kirby-Bauer assays of these disk samples showed an increasing zone of inhibition with increasing concentration of PAMBM. Finally, the PAMBM-containing coating was applied to sutures, and the morphology of the coating surface was characterized by SEM, along with Vicryl and uncoated sutures. The PAMBM-containing sutures killed bacteria more effectively (3 log(10) reduction at 2.4 wt %) than Vicryl Plus sutures (0.5 log(10) reduction).

Li Y; Kumar KN; Dabkowski JM; Corrigan M; Scott RW; Nüsslein K; Tew GN

2012-08-01

77

Progress in polypropylene nanocomposite development  

Energy Technology Data Exchange (ETDEWEB)

This article summarizes some of the highlights of newest developments in polypropylene (PP) clay nanocomposite research. Different property improvements, including mechanical performance enhancements, achieved by melt compounding of organoclay materials with PP and/or PP-g-MA are presented. (Abstract Copyright [2003], Wiley Periodicals, Inc.)

Leuteritz, A.; Pospiech, D.; Kretzschmar, B.; Willeke, M.; Jehnichen, D.; Jentzsch, U.; Grundke, K.; Janke, A. [Institute of Polymer Research, PO Box 12 04 11, D-01005 Dresden (Germany)

2003-09-01

78

New flexible endoscopic full-thickness suturing device: a triple-arm-bar suturing system.  

Science.gov (United States)

Background and study aim: A reliable full-thickness suturing device is necessary for pure natural orifice transluminal endoscopic surgery (NOTES). The present study focused on assessing the reliability of a new suturing device. Methods: A total of 60 single sutures were tested to close 5-cm incisions in 8-cm square pieces of resected swine stomach. Each incision was sutured by an over-the-scope clip (OTSC; n = 20), a single hand-sewn stitch (n = 20), or a single triple-arm-bar suturing system (TBSS) stitch. The maximum pulling force durability (MPD) of each suture was tested. To assess the reliability of the TBSS for endoscopic full-thickness resection (EFTR), 60 EFTRs of 50 mm diameter were performed on excised swine stomachs. After EFTR, full-thickness sutures were made using 3-stitch OTSCs (n = 20), 10-stitch hand-sewn sutures (n = 20), or 10-stitch TBSS sutures (n = 20). Outcomes were the MPD test for both single stitch and multiple stitch applications and the suturing time for single-stitch sutures.Results: In the single-stitch MPD tests, there were significant differences between OTSCs and hand-sewn sutures (P = 0.0002) and between OTSCs and TBSS sutures (P = 0.0001), but no significant difference between hand-sewn and TBSS sutures. The multiple-stitch sutures revealed significant differences between OTSCs and hand-sewn sutures (P = 0.0039), and between OTSCs and TBSS sutures (P = 0.013). There was no significant difference between hand-sewn and TBSS sutures. There were significant differences in suture times between OTSC, hand-sewn sutures, and TBSS sutures (P < 0.05). Conclusions: Both single-stitch and multiple-stitch sutures using TBSS have similar strength to hand-sewn sutures. TBSS is a reliable suturing device. PMID:23881805

Mori, H; Kobara, H; Rafiq, K; Nishiyama, N; Fujihara, S; Kobayashi, M; Oryu, M; Fujiwara, M; Suzuki, Y; Masaki, T

2013-07-23

79

Structural and optical properties of polypropylene-montmorillonite nanocomposites  

International Nuclear Information System (INIS)

In this work, polypropylene-commercial montmorillonite organophilic clay nanocomposites were prepared using a Werner Pfleiderer twin-screw extruder. Considering the nonpolar characteristic of the polypropylene, polypropylene-graft-maleic anhydride (PP-g-MA) was used as a coupling agent to improve the intercalation process into the layers of montmorillonite. The materials containing 2.5, 5.0, 7.5 and 10.0% of the clay (N2.5, N5, N7.5 and N10) and PP and two extra compositions containing only PP and 15.0 and 30.0% of PP-g-MA (PP, P15 and P30), respectively, were investigated upon the nanocomposites structures. The properties of materials were characterized by X-ray diffraction (XRD), SEM analysis and reflectance spectrophotometry. The X-ray diffraction showed exfoliated or intercalated structure for different concentrations; the SEM analysis showed a good dispersion of the clay in the PP matrix and the spectrophotometric analysis showed that the amount of clay used in the compositions resulted in different levels of opacity.

2007-02-25

80

Knot pusher and suture cutter instrument  

UK PubMed Central (United Kingdom)

A combined knot pusher/suture cutter device for manipulating a knotted suture to properly locate the knot relative to the tissue being sutured, and then for removing excess suture from the knot. The knot pusher/suture cutter includes a body member with a handle and an inner member (or inner rod) having a knot-engageable section at the opposite end (distal end) for engaging and moving the knotted suture by manipulation of the handle. The knot-engageable section of the inner member is provided with a slot at its distal end which allows suture to be threaded through it. The inner member is provided within an outer sleeve that is designed to be actuated by a spring and a thumb pusher (trigger) located on a surface of the handle. By actuating the thumb trigger (for example, by sliding forward the thumb trigger), the outer sleeve is advanced and the suture post is cut.

STERRETT JERRY; KOOGLE DAVID

 
 
 
 
81

KNOT PUSHER AND SUTURE CUTTER INSTRUMENT  

UK PubMed Central (United Kingdom)

A combined knot pusher/suture cutter device for manipulating a knotted suture to properly locate the knot relative to the tissue being sutured, and then for removing excess suture from the knot. The knot pusher/suture cutter includes a body member with a handle and an inner member (or inner rod) having a knot-engageable section at the opposite end (distal end) for engaging and moving the knotted suture by manipulation of the handle. The knot-engageable section of the inner member is provided with a slot at its distal end which allows suture to be threaded through it. The inner member is provided within an outer sleeve that is designed to be actuated by a spring and a thumb pusher (trigger) located on a surface of the handle. By actuating the thumb trigger (for example, by sliding forward the thumb trigger), the outer sleeve is advanced and the suture post is cut.

KOOGLE JR. DAVID C; STERRETT JERRY F

82

Woodflour as Reinforcement of Polypropylene  

Directory of Open Access Journals (Sweden)

Full Text Available The effect of the filler content and size, as well as accelerated aging on the mechanical properties of polypropylene composites reinforced with woodflour (WF/PP) were evaluated. The composites were prepared by the extrusion of polypropylene with woodflour (Pinus elliotti) based on following ratios: 15, 25 and 40 wt% with two different granulometries. The specimens were injection molded according to ASTM standards. The composite properties did not show significant differences as a function of the filler granulometry. We also observed that by increasing the filler content, both the mechanical properties and the melt flow index (MFI) decreased, and the elasticity modulus, hardness and density increased. Concerning the accelerated aging, the composite presented a reduction in tensile properties. The results showed that the composite properties are extremely favorable when compared to other commercial systems reinforced by inorganic fillers.

José Cláudio Caraschi; Alcides Lopes Leão

2002-01-01

83

Mechanical Properties Polypropylene-Wood  

UK PubMed Central (United Kingdom)

: The mechanical properties and morphology of polypropylene/wood flour(PP/WF) composites with different impact modifiers and maleated polypropylene(MAPP) as a compatibilizer have been studied. Two different ethylene/propylene/dieneterpolymers (EPDM) and one maleated styrene-ethylene/butylene-styrene triblockcopolymer (SEBS-MA) have been used as impact modifiers in the PP/WF systems.All three elastomers increased the impact strength of the PP/WF composites but theaddition of maleated EPDM and SEBS gave the greatest improvements in impactstrength. Addition of MAPP did not affect the impact properties of the composites buthad a positive effect on the composite unnotched impact strength when used togetherwith elastomers. Tensile tests showed that MAPP had a negative effect on the elongationat break and a positive effect on tensile strength. The impact modifiers were foundto decrease the stiffness of the composites. Scanning electron microscopy showed thatmaleated EPDM an...

Kristiina Oksman; Craig Clemons

84

Uterine compression suture without hysterotomy--why a non-absorbable suture should be avoided.  

UK PubMed Central (United Kingdom)

We describe 2 cases of uterine compression suture without hysterotomy, only described once in the literature previously (Hayman et al. 2002). We consider in detail the suture material used for this technique and show photos of the compression suture at laparoscopy 4 weeks after insertion to demonstrate why it is inappropriate to use a non-absorbable suture. Modified compression sutures are being used increasingly and a wide variety of suture materials are being chosen, including vicryl, PDS and nylon (verbal communications). We feel it important to report our findings so that others can avoid the use of non or slowly absorbable sutures.

Cotzias C; Girling J

2005-02-01

85

Rheological properties of polypropylene/ attapulgite nanocomposite.  

UK PubMed Central (United Kingdom)

The rheological properties of nanocomposites consisting of organic modified attapulgite and polypropylene are investigated. The morphology of the nanocomposites was studied with scanning electron microscopy and X-ray diffraction. Linear dynamic viscoelasticity and steady state flow step of the nanocomposites are presented. For the nanocomposites, the deviation from linear behavior occurs earlier than pure polypropylene at the strain. The storage moduli, loss moduli and dynamic viscosities of the nanocomposites increase monotonically with organoclay concentration. However, the nanocomposites show greater shear thinning tendency than pure polypropylene because of the orientation of the organoclay fibers. Therefore, the nanocomposites have higher moduli but better processibility compared with pure polypropylene.

Zhang X; Guo J; Zhang L; Yang S; Zhang J; He Y

2010-08-01

86

Rheological properties of polypropylene/ attapulgite nanocomposite.  

Science.gov (United States)

The rheological properties of nanocomposites consisting of organic modified attapulgite and polypropylene are investigated. The morphology of the nanocomposites was studied with scanning electron microscopy and X-ray diffraction. Linear dynamic viscoelasticity and steady state flow step of the nanocomposites are presented. For the nanocomposites, the deviation from linear behavior occurs earlier than pure polypropylene at the strain. The storage moduli, loss moduli and dynamic viscosities of the nanocomposites increase monotonically with organoclay concentration. However, the nanocomposites show greater shear thinning tendency than pure polypropylene because of the orientation of the organoclay fibers. Therefore, the nanocomposites have higher moduli but better processibility compared with pure polypropylene. PMID:21125882

Zhang, Xiaohu; Guo, Jinshan; Zhang, Liji; Yang, Shiyuan; Zhang, Jie; He, Yutao

2010-08-01

87

Bordered Floer homology for sutured manifolds  

CERN Document Server

We define a sutured cobordism category of surfaces with boundary and 3-manifolds with corners. In this category a sutured 3-manifold is regarded as a morphism from the empty surface to itself. In the process we define a new class of geometric objects, called bordered sutured manifolds, that generalize both sutured 3-manifolds and bordered 3-manifolds. We extend the definition of bordered Floer homology to these objects, giving a functor from a decorated version of the sutured category to A-infinity algebras, and A-infinity bimodules. As an application we give a way to recover the sutured homology SFH(M,Gamma) of a sutured manifold from either of the bordered invariants CFA(M) and CFD(M) of its underlying manifold M. A further application is a new proof of the surface decomposition formula of Juhasz.

Zarev, Rumen

2009-01-01

88

Radiation stabilization of polypropylene by phenolic stabilizers  

International Nuclear Information System (INIS)

[en] The radiation stability of polypropylene stabilized with two phenolic stabilizers and synergistic behaviour of these stabilizers have been investigated. The variation of carbonyl index and mechanical properties of stabilized and unstabilized polypropylene has been followed for 6 months after irradiation at 25 kGy. The extent of chain scission has been followed by measuring the change in apparent viscosity. (author)

1993-01-01

89

An alternative alar cinch suture.  

UK PubMed Central (United Kingdom)

Nasal widening is commonly associated to maxillary osteotomies, but it is only partially dependent on the amount of skeletal movement. Techniques for controlling lateralization of the ala, including the alar base cinch technique, originally described by Millard, have been well reported by Collins and Epker and later modified by others. In this article, authors report the effect of a new alar cinch suture technique on a sample of 32 patients.

Rauso R; Freda N; Curinga G; Del Pero C; Tartaro G

2010-01-01

90

Shaped suture clip, appliance and method therefor  

UK PubMed Central (United Kingdom)

The suture clip includes a pair of plates joined together at one end to form a vertex having an acute angle. Each plate, at its remote terminal end, defines an inwardly facing hook. The hook end members establish a clip mouth slightly larger than the diameter of the suture thread such that when the thread is passed through the clip mouth, the thread cannot easily escape entrapment from the central region of the clip. The suture clip may be C-shape, V-shape, broken leg V-shape, heart shape or pentagonal shape. In another embodiment, the clip is a closed loop or elliptical in shape. To enhance operability, the hooks on the C, U or V shaped sutures are disposed on tabs which are laterally displaced with respect to each other such that, upon collapse and closure of the clip plates, the tabs interleave each other and interlock over the opposite clip plate. This feature enhances attachment to suture thread. The method for attachment on suture thread includes providing a clip having several specific features, passing the suture thread through the clip mouth and collapsing the clip plates together over the suture. The enhanced method interleaves terminal edge tabs and interlocks a respective tab over an opposing corresponding clip plate. The surgical appliance for clipping together suture thread includes a suture clip having certain characteristics, a pair of opposing appliance jaws and an elongated mechanical linkage which, upon compression of handle members by a user at a proximal location, the mechanical linkage transfers that force and movement to the compress appliance jaws at a distal end of the appliance thereby closing the suture clip on the suture thread. The enhance threading the suture through the lumen of the clip, an elongated closed loop wire is utilized.

LEVINSON MELVIN E; FLUGRAD RUSSELL C; DROST MICHAEL J; KALAT EDWARD W

91

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

UK PubMed Central (United Kingdom)

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

Hapa O; Ak?ahin E; Erduran M; Davul S; Havitçio?lu H; Laprade RF; Bozda? E; Sünbülo?lu E

2013-01-01

92

Thermal behavior of syndiotactic polypropylene/atactic polypropylene blends  

Energy Technology Data Exchange (ETDEWEB)

Syndiotactic polypropylene (sPP) showing high racemic pentad ({gamma}{gamma}{gamma}{gamma}) value of 97.6% has been synthesized by (iPr-(CP)(Flu)=isopropylidene(1-{eta}{sup 5}-cyclopentadienyl)(1-{eta}{sup 5}-fluorenyl)= ) compound which is prepared by the methylation of syndiospecific metallocene catalyst, iPr-(CP)(Flu)ZrCl{sub 2} by using MgMe{sub 2}, cocatalyzed with noncoordinating anionic compound, [HNMe{sub 2}Ph][B(C{sub 6}F{sub 5}){sub 4}]. Neat sPP has been characterized by {sup 13}C NMR, IR, x-ray diffraction, DSC, and TGA analysis. Various sPP/atactic polypropylene (aPP) blends (sPP/aPP=90/10, 80/20, and 60/40) prepared by solution blending were also analyzed by the same method. According the IR analysis carried out by polymer films there exists a good correlation between IR index and the enthalpy of melting ({Delta}H{sub m}) of polymer. The x-ray crystallinity of the blends is decreased with the amount of aPP. sPP and its blends show double melting peaks representing polymorphism. The number and the area ratio of each peak are dependent on thermal history of the sample. The results of analysis by Avrami equation shows that the half-time of crystallization is decreased according to the increase of aPP content and that Avrami index is in the range of 2.10 and 3.15. The equilibrium melting temperature of neat sPP is 152.6 {sup o} C, and those of sPP/aPP blends are 151.5, 150.8, and 147.5 {sup o} C for sPP/aPP=90/10, 80/20, and 60/40, respectively.

Kim, I.; Lee, S.W.; Kim, Y.T. [University of Ulsan, Ulsan (Korea, Republic of)

1998-03-01

93

Trabeculectomy flap suture lysis with endolaser probe.  

UK PubMed Central (United Kingdom)

Enhancing filtration after trabeculectomy with scleral flap sometimes requires cutting of the nylon suture. A new use of the endolaser probe to cut the nylon suture through hemorrhagic and edematous conjunctiva and Tenon's capsule is described. The probe compresses the tissue so that it is close to the suture for delivery of the laser energy. This application of the endolaser probe as an "ecto-laser" succeeded in enhancing filtration, raising the conjunctival bleb, and lowering intraocular pressure.

Salamon SM

1987-07-01

94

Anastomose arterial com fio de polidioxanona e fio de polipropileno. Estudo comparativo em cães Arterial anastomose with polydioxanone and polypropilene suture. Comparative study in dogs  

Directory of Open Access Journals (Sweden)

Full Text Available Este estudo teve por objetivo comparar os efeitos do fio absorvível de polidioxanona com o fio inabsorvível de polipropileno, em anastomoses término-terminais, em artérias femorais de cães. Foram utilizados 20 cães, separados em dois grupos, para observação no 7º e no 30º dia de pós-operatório. Cada cão teve suas artérias femorais seccionadas e aproximadas em um lado com pontos separados de fio de polidioxanona 6-0, e no lado contralateral com o fio de polipropileno 6-0. A escolha do fio foi feita por sorteio, totalizando 40 anastomoses. Para análise estatística dos resultados aplicaram-se os testes de Fisher, Mac Nemar, Wilcoxon, Mann-Witney e o teste T de Student (a ? 0,05). Nas avaliações clínicas não foram observadas diferenças significantes entre os fios utilizados. Os resultados obtidos nas avaliações arteriográfica e macroscópica dos segmentos arteriais foram semelhantes, assim como na análise histológica morfológica. Na análise histológica morfométrica o fio de polipropileno apresentou número de células gigantes de corpo estranho significativamente maior que o fio de polidioxanona aos 7 e 30 dias de pós-operatório. Os resultados nos permitem concluir que, apesar da maior reação de corpo estranho observada com o fio de polipropileno, o fio de polidioxanona apresentou resultados semelhantes ao fio de polipropileno, em anastomoses arteriais em cães.The objetive of this study was to compare the effects of the absorbable polidioxanone suture to the nonabsorbable polypropylene suture, in end-to-end anastomoses, using dog’s femoral arteries. Twenty dogs were separated in two groups for observation on the 7th and 30th post-operatory day. Each dog had its femoral arteries seccioned and then aproximated one side with separate stitches of polidioxanone 6-0 suture, and the other side with polypropylene 6-0 suture. For the statistical studies Fisher, Mac nemar, Wilsoxon, Mann-Witney and T of Student tests (a ? 0,05) were carried out. No significant differences were observed between the sutures employed in clinical evolution. The results obtained in the arteriographic and macroscopic avaliation were similar, as well as the morphological histologic analysis. In the morfometric histologic analysis the polypropylene suture showed a significantly higher number of foreign body giant cells reaction, comparing to the polydioxanone suture on the 7th or 30th post-operatory day. The results allow us to conclude that, in spit of the higher reaction of foreign body observed with the polypropilene suture, the polydioxanone suture showed similar results in dog’s arterial anastomoses.

Marcos Victor Ferreira; Amaury José Teixeira Nigro; César Orlando Peralta Bandeira; Carlos Edmundo Rodrigues Fontes; Eloísa de Brida Tormena; Lia Yoneka Toda; Fabiana de Cássia Merenda

2002-01-01

95

Influence of surgical sutures on wound healing  

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Full Text Available Historical data on closing and suturing of surgical wounds describe a wide range of various suture materials. The choice of the surgical catgut, i.e. the type and diameter, depends on the locality, characteristics and condition of the tissue to be treated. From the standpoint of oral-surgical practice the following clinical parameters are of outstanding importance with respect to the selection of suture material: accumulation of soft deposits on the sutures, score of the adjacent soft tissues and dehiscence of the operative wound. Our prospective clinical study included 150 patients distributed into three groups of 50 subjects. The surgical procedure performed on each patient involved resection (apicotomy) of the tooth root end in the intercanine sector of the upper jaw. The following suture materials were applied: Black Silc 5-0, Nylon 5-0 and Vicryl 5-0. The effects of the selected sutures were evaluated according to the wound dehiscence. The effects of the applied sutures were recorded on Days 2, 5 and 7 after the surgery. The comparison of cited parameters of the investigated materials after suturing the oral mucosa revealed that none of the used material was ideal; however, a certain advantage might be given to the synthetic monofilament suture materials.

Mirkovi? Siniša; Selakovi? Sre?ko; Šar?ev Ivan; Bajkin Branislav

2010-01-01

96

Polyglactin 910 suture in urinary tract.  

Science.gov (United States)

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

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

1977-05-01

97

Polyglactin 910 suture in urinary tract.  

UK PubMed Central (United Kingdom)

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

Bartone FF; Gardner PJ; Hutson JC

1977-05-01

98

Inverting sutures for tarsal ectropion (the leicester modified suture technique).  

UK PubMed Central (United Kingdom)

PURPOSE: To describe a simple technique to correct tarsal lower eyelid ectropion with or without marked eyelid laxity (The Leicester Modified Suture technique). METHODS: A retrospective interventional case series of patients undergoing correction of tarsal ectropion with inverting sutures. The study adhered to the principles of the Declaration of Helsinki. RESULTS: Twenty patients (25 eyelids) met the inclusion criteria. The success of the procedure was assessed by improvement of symptoms, eyelid position, and the need for reoperation. The mean postoperative follow up was 3.6 months (range 2-15 months). Eighteen patients (90%) had a successful outcome, while in 2 patients (10%) the outcome was satisfactory, as there was mild residual eversion of the eyelids. None of the patients required reoperation. CONCLUSIONS: Tarsal lower eyelid ectropion can be surgically challenging to correct via the transconjunctival plication or subciliary reattachment of retractors. This method is simple to use, resulting in an excellent outcome with no tissue dissection. This technique is easy to learn and implement for oculoplastic surgeons at all levels of experience.

Berry-Brincat A; Burns J; Sampath R

2013-09-01

99

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

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Full Text Available Richard MH Lee,1 Fook Chang Lam,1 Tassos Georgiou,1 Bobby Paul,1 Kong Yong Then,1 Ioannis Mavrikakis,1 Venkata S Avadhanam,1 Christopher SC Liu1,21Sussex Eye Hospital, Brighton, United Kingdom; 2Tongdean Eye Clinic, Hove, United KingdomAims: 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.Keywords: corneal graft, penetrating keratoplasty, anterior segment surgery, cornea, corneal surgery, corneal transplantation

Lee RM; Lam FC; Georgiou T; Paul B; Then KY; Mavrikakis I; Avadhanam VS; Liu CS

2012-01-01

100

The effects of compression sutures on filtering blebs in rabbit eyes.  

UK PubMed Central (United Kingdom)

PURPOSE: To investigate the effect of compression sutures on filtering bleb cellularity in rabbit eyes. METHODS: Six New Zealand rabbits had bilateral filtering surgery. In the study eye, on postoperative day 14 a 10-0 nylon suture was placed that compressed the bleb. Five-bromo-2'-deoxyuridine (BrdU) was injected intravenously on days 15, 16, and 18. On day 21 histologic sections of the blebs were obtained. The total cell count was compared to the number of actively dividing cells (marked by anti-BrdU antibody). RESULTS: Study eyes had higher total cell counts (P = .004) on postoperative day 21, but the proportion of proliferating cells was not significantly different (P = .11). CONCLUSION: In rabbit eyes, bleb compression sutures were associated with more cellular components in the bleb compared to control eyes, but did not induce a higher level of cellular proliferation.

Chen PP; Takahashi Y; Leen MM; Bhandari A; Li Y; Mills RP

1999-03-01

 
 
 
 
101

Polypropylene small-diameter vascular grafts.  

UK PubMed Central (United Kingdom)

Polypropylene's physical properties (e.g., high tensile strength) and relatively inert behavior suggest that fabrication into an arterial substitute may result in an efficacious prosthesis. Grafts were woven from polypropylene yarn into conduits 4 mm I.D. x 50 mm in length. Control grafts were Dacron and ePTFE. Baseline platelet aggregometry on all dogs was performed with 10(-5) M ADP. Aspirin and dipyridamole were given for three days preoperatively and maintained for 2 weeks after surgery. Fifty-four grafts were placed into the aortoiliac position, two different graft materials per dog. The grafts were explanted at intervals of 2 weeks through 16 months; photographed for thrombus-free surface area determinations; and preserved for light, scanning, and transmission electron microscopy. Late (4-16 month) patency was 81% (13/16) for polypropylene, 69% (9/13) for Dacron, and 20% (1/5) for ePTFE. These data include one year patencies of 11/12 (92%) for polypropylene and 7/10 (70%) for Dacron. Late patency for polypropylene grafts was better than for PTFE (p less than 0.05). Platelet aggregation status did not predict graft patency. Light microscopy of 2-week polypropylene explants showed inner capsules composed of myofibroblasts and macrophages, with patchy areas of endothelial cells lining the lumen. By 1 month, a confluent endothelialized surface was seen in all polypropylene explants. Progressive thickening of inner capsules with myofibroblasts and collagen continued through 4 months, reaching a mean thickness of 142 +/- 50 microns (compared to 150 +/- 30 microns for Dacron). These findings suggest potential clinical efficacy for polypropylene as an arterial substitute.

Greisler HP; Tattersall CW; Henderson SC; Cabusao EA; Garfield JD; Kim DU

1992-10-01

102

Comparison of sutures and cyanoacrylate tissue adhesives for wound repair in a rat model of corneal laceration.  

UK PubMed Central (United Kingdom)

AIMS: The aim of the present study was to evaluate the cicatricial repair of a corneal artificial perforation in rats with 10-0 nylon suture, N-butyl-2-cyanoacrylate (NBCA) adhesive, or NBCA + methacryloxysulfolane (NBCA-MS) adhesive through microscopic and histological assays. METHODS: Twenty Wistar rats were randomly divided into 4 groups each containing 5 rats: (1) control group (corneal trauma without suturing and tissue adhesives), (2) suture group, (3) NBCA group and (4) NBCA-MS group. A central full-thickness 2-mm laceration was performed in the left eyes of the studied rats in all 4 groups. The presence of corneal edema, corneal neovascularization and tissue adhesive/suture were evaluated. On the 21st day, the rats were sacrificed and histological examination was performed to determine irregularity of corneal layers, superficial epithelization, polymorphonuclear leucocytes and neovascularization. RESULTS: Tissue adhesives were as effective as suturing in closing full-thickness corneal wounds and no difference in postoperative healing was observed clinically. As for the histological results, suture-treated eyes had persistent corneal irregularity that can limit visual acuity and may also lead to astigmatism. CONCLUSIONS: The use of tissue adhesives constitutes a viable alternative clinical procedure to conventional sutures. Possible influences on astigmatism are hypothetical, as no objective measure of astigmatism was performed in the test animals.

Nuhoglu F; Altiparmak UE; Hazirolan DO; Kasim R; Duman S

2013-01-01

103

Needle and suture contamination in strabismus surgery  

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Full Text Available Objective: To evaluate the level of bacterial contamination of needles and sutures used in strabismus surgery. Material and Methods: Strabismus surgery was performed on 30 eyes of 20 patients in our clinic between January 2004 and June 2004. Preoperative site preparation included installation of 5% povidine-iodine in the conjunctival fornices in all cases. A total of 60 needles and 60 sutures were cultured immediately after final scleral passage. Results: Ten of the 20 cases (50%) produced at least one positive specimen. 8.3% of the needles and 15% of the sutures were culture positive. In all culture positive specimens 40% of the needles and 55% of the sutures produced 3 or less colony forming units (CFU). 4-6 CFU in 20% of needles and 11% of sutures, 7 or more CFU in 40% of needles and 34% of sutures were demonstrated accordance with dilution scheme. Coagulase-negative staphylococci were overwhelmingly predominated. Conclusion: The amount of bacterial contamination is usually below the level known to produce endophthalmitis in strabismus surgery. Needles and sutures used in strabismus surgery can become contaminated during surgery despite povidine-iodine usage. Needles and sutures with high contamination could potentially cause postoperative intraocular infection.

Betül Tu?cu; Seyhan Ördekçi; F?rat Helvac?o?lu; Nazire Terzi; Sad?k ?encan

2007-01-01

104

Transseptal suture to secure middle meatal spacers.  

UK PubMed Central (United Kingdom)

Middle meatal spacers are used by many sinus surgeons to aid postoperative care. Aspiration of a spacer is a concern. We demonstrate a novel method of securing spacers with a transseptal suture to prevent aspiration. We fashion each spacer from a powder-free, nonlatex glove finger that is packed with a Merocel sponge. The open end of the finger is closed with 2-0 Prolene sutures. For a bilateral procedure, the needle is left attached to one of the spacers. A spacer is placed in each ethmoid cavity, the attached needle is passed through the anterior cartilaginous septum, and the suture is tied to the suture on the opposite spacer. For unilateral procedures, the suture on the single spacer is passed to the contralateral side and tied on itself. One week later, the transseptal suture is cut and the spacers are removed. We performed this procedure on 78 patients who had undergone total ethmoidectomy. None of the spacers migrated during the 1 week they were in place. One patient complained of pain during removal of a spacer. During follow-up of 2 to 10 months, we found no evidence of injury to the septum at the site of the transseptal suture. We conclude that the transseptal suture is a safe and cosmetically superior method of securing middle meatal spacers.

Hockstein NG; Bales CB; Palmer JN

2006-01-01

105

Factors influencing peripheral nerve suture results.  

UK PubMed Central (United Kingdom)

Besides the surgical treatment, other factors do greatly influence the results following peripheral nerve suture. On the basis of our own findings in more than 80 patients, we analyze those factors, the exclusion of which prevents a satisfactory comparison between the different results in peripheral nerve suturing, as well as a valid discussion of their implications.

Müller H; Grubel G

1983-01-01

106

Suture burial technique in scleral fixation.  

UK PubMed Central (United Kingdom)

The end of a scleral fixation suture may erode through the conjunctiva and become exposed. To avoid this, a scleral flap, autologous cornea, dura mater, or fascia lata patches have been used to cover the ends, and rotation of the knot into the tissue has been reported. An alternative technique to bury the end of the suture is described.

Baykara M

2004-05-01

107

Post thyroidectomy suture granuloma: a cytological diagnosis.  

UK PubMed Central (United Kingdom)

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

Javalgi AP; Arakeri SU

2013-04-01

108

Laparoscopic transperitoneal repair of lumbar incisional hernias: a combined suture and 'double-mesh' technique.  

UK PubMed Central (United Kingdom)

BACKGROUND: Lumbar hernias that occur after surgery are called lumbar incisional hernias. Recently, laparoscopic repair of these hernias has been reported with excellent outcomes. This is a retrospective study of our series of patients with lumbar incisional hernias. PATIENTS AND METHODS: We managed 11 patients with lumbar incisional hernias from 1996-2006. All the patients had undergone either nephrectomy or pyeloplasty in the past. Laparoscopic suturing of the defect and reinforcement with mesh were successfully performed for all the patients. RESULTS: There were more males than females, the age range was 42-65 years, and mean operating time was 120 min; discharge was at 1-2 postoperative days. There was no recurrence or mortality. Three cases had seroma, out of which two required aspiration after 60 days. DISCUSSION: Laparoscopic repair provides all the benefits of minimally invasive surgery, and the principles involved in repair of ventral hernias are applied in lumbar incisional hernias as well. Our technique involved suturing of the defect before placing a mesh over the defect. We theorize that approximating the ends of the muscles restores normal anatomy and results in functional improvement. For the larger hernias, we used two meshes to cover the defect--polypropylene and Parietex, sizes being 15 x 15 cm. CONCLUSION: Laparoscopic repair with prosthetic reinforcement is feasible and effective in the treatment of lumbar incisional hernias. Also, suturing of the defect may provide additional benefits.

Palanivelu C; Rangarajan M; John SJ; Madankumar MV; Senthilkumar K

2008-02-01

109

New adjustable suture technique for trabeculectomy.  

UK PubMed Central (United Kingdom)

PURPOSE: To describe an adjustable suture (AS) experimental model that allows for tightening, loosening and retightening of the suture tension in trabeculectomy. METHODS: Standard trabeculectomy was performed in fifteen pig eyeballs. All pig eyes were tested twice: one test with conventional suture in both flap's corners (conventional suture group) and another test with a conventional suture at one corner and an adjustable suture in the other corner (AS group). The order in which each test was performed was defined by randomization. Intraocular pressure was measured at three time points: T1) when the knots were tightened; T2) when the AS was loosened or the conventional knot was removed; and T3) when the AS was retightened in the AS group or five minutes after the knot removal in the conventional suture group. RESULTS: The mean Intraocular pressure was similar between the two groups at time point 1 (p=0.97). However, significant Intraocular pressure differences were found between eyes in the conventional and adjustable suture groups at time points 2 (12.6 ± 4.2 vs 16.3 ± 2.3 cmH?O, respectively, p=0.006) and 3 (12.2 ± 4.0 vs 26.4 ± 1.7 cmH?O, respectively; p=0.001). While the conventional technique allowed only Intraocular pressure reduction (following the knot removal; T2 and T3), the AS technique allowed both Intraocular pressure reduction (T2) and elevation (T3) through the management (loosening and retightening) of the suture. CONCLUSION: This experimental model provides an effective noninvasive postoperative mechanism of suture tension adjustment.

Rebouças-Santos V; Meira-Freitas D; Cariello AJ; Prata Tdos S; Teixeira SH

2013-05-01

110

Polypropylene nanogel: “Myth or reality”  

International Nuclear Information System (INIS)

The objective of this work is the investigation of the nanogel and microgel formation in modified PP. The modified PP in pellets was synthesized by gamma irradiation of pristine PP under a crosslinking atmosphere of acetylene in dose of 5, 12.5 and 20 kGy, followed by thermal treatment for radical recombination and annihilation of the remaining radicals. The thin film gel of the polypropylenes was obtained by extraction in boiling xylene for period of 12 h at 138 °C, followed by decantation in beaker at room temperature of 25 °C with the total volatilization of the xylene and deposition of dried material film on glass substrate under agitation by Settling process. The thin film gel formed of pristine PP and modified PP (i.e., irradiated) was characterized using scanning electron microscopy (SEM), field emission scanning electron microscopy (FESEM) and differential scanning calorimetry (DSC). The PP morphology indicated the nanogels and microgel formation with increase of spherulitic concentration and crystallinity at dose of 12.5 kGy. - Highlights: ? The formation of nanogels comes from irradiated sites prior to crosslink bonds. ? Evolution of nanogels in size creates domains with lower crosslink density and defects. ? In conclusion nanogel is present in the irradiated PP and has crystallinity.

2011-09-01

111

Aksa plans polypropylene joint venture  

Energy Technology Data Exchange (ETDEWEB)

Turkish acrylic fiber maker Aksa (Yalova), part of the Akkok textile conglomerate, is studying construction of a world-scale polypropylene (PP) plant as part of its diversification plans. The company says it is engaged in discussions with three multinations in the PP business' on the possibility of a joint venture. One of the firms is understood to be Amoco. Aksa is looking at three possible locations for the 100,000 m.t.-150,000 m.t./year plant: Yalova, near Istanbul, where its existing plants are located; Zonguldak, on the Black Sea coast; and within one of the existing complexes or a new site belonging to state-owned Petkim. Aksa has not yet discussed that option with Petkim, which recently received approval to build a $2.5-billion petrochemical complex. The Aksa PP plant would cost about $100 million and would use propylene from world markets. The onstream date depends on Aksa's ability to link up with a foreign partner, but it hopes to complete the unit within three years. Turkey has only one PP plant, a 65,000-m.t./year Petkim unit at Aliaga. The domestic market is currently two to three times that amount and is growing. Petkim also plans a 200,000-m.t./year PP plant as part of its new complex.

Alperowicz, N.

1992-12-02

112

Radiofrequency and its effect on suture strength.  

UK PubMed Central (United Kingdom)

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

Shah AA; Kang P; Deutsch A

2009-12-01

113

Radiofrequency and its effect on suture strength.  

Science.gov (United States)

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

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

2009-12-01

114

[Hiatoplasty reinforcement by means of a lightweight titanized polypropylene mesh fixed with fibrin glue].  

UK PubMed Central (United Kingdom)

INTRODUCTION: Suture-based hiatoplasty is associated with a high recurrence rate. Using meshes of different shapes and materials to reinforce these sutures reduces the risk of recurrences. On the other hand morbidity attributable to the suture and tack fixation of these meshes has been observed during the development phase of these techniques. Moreover, there are some experimental and clinical data about mesh migration into the oesophageus. For this reason we analysed the outcome of our patients who underwent a mesh-reinforced hiatoplasty with a lightweight titanised polypropylene mesh fixed by fibrin glue. PATIENTS AND METHODS: All the patients who under-went a mesh-reinforcement between 3?/?2006 and 12?/?2007 were collected retrospectively. The hiatoplasty was reinforced by means of a lightweight titanised polypropylene mesh that had been designed especially for that purpose (TiSure®, GfE). Mesh fixation was performed with 2? mL of fibrin glue (Tissucol®, Baxter). Postoperative data were elucidated for all patients via their general practitioner or by interviewing the patients by telephone using a dedicated questionnaire. RESULTS: 26 ?patients with a median age of 58? years and a median BMI of 27.5?kg?/?m² underwent laparoscopic mesh-reinforced hiatoplasty. There were 15 ?axial and 11 ?paraoesophageal hernias, in 5 ?cases with upside-down stomach and in 4 ?cases recurrent hernias. 15? patients underwent an additional dorsal 270°-fundoplication, the remaining 11 patients had a fundophrenicopexy, with conversion taking place in 2? cases. The median follow-up was 34.3 ?months. 3? patients suffered from dysphagia, 1 ?of them had to be re-operated and has been free of symptoms since then. 2? patients suffered from mild gastrooesophageal reflux which was treated conservatively. So far no mesh migration and no recurrences have been seen. CONCLUSIONS: Despite the short observation time, this study indicates the patients are not exposed to any danger by the lightweight titanised polypropylene mesh. Moreover, the mesh appears to enhance hiatorrhaphy safety even in the presence of extensive hiatal hernias as well as in the case of an upside-down stomach.

Kanellos D; Moesta KT; Schug-Pass C; Köckerling F

2011-06-01

115

The lateral pulley buried dermal suture.  

UK PubMed Central (United Kingdom)

To achieve complete closure of wounds under tension, the lateral pulley buried dermal suture is described. The pulley loop exists not between the two margins of the wound, but in the outer dermis. The needle entry and exit occur on the undermined undersurface of the dermis. It has mechanical advantages similar to the modified buried dermal suture and compresses less marginal tissue. The pulley suture can secure the wound under tension without creating tension on the epidermis and superficial dermis at the wound edge.

Huang L

2011-08-01

116

Normally shaped heads with no sutures, normally shaped heads with abnormal sutures, and abnormally shaped heads with normal sutures.  

UK PubMed Central (United Kingdom)

UNLABELLED: We present a series of children whose head shapes and suture status do not make sense. There were 3 patients with complete absence of sutures and normal head shapes. One patient was evaluated for microcephaly at 6 years of age. In the second, the absence of sutures was discovered on workup for headaches at 8 years of age. The third underwent x-ray imaging for parasagittal bony nodules at 1 month of age. The head circumferences fell at the 4th, 25th, and 50th percentiles, respectively. The 2 older children were in normal classes, and the youngest was meeting milestones appropriately. We encountered 3 patients with fusion of the sagittal suture and normal head shapes. One had a flattened occiput, the second patient was thought to be brachycephalic, and the third was macrocephalic. Head circumferences were at the fourth, 50th, and 75th percentiles. The patient with head circumference at the fourth percentile had fetal alcohol syndrome and speech delay. The other 2 were developing normally with follow-up of 14 months. Finally, 3 patients underwent surgery for characteristic craniosynostotic head shapes and were found to have patent sutures at surgery. One patient had classic unilateral coronal synostosis and a patent suture on the side of the defect. The second patient had Crouzon syndrome with characteristic head shape, but open coronal sutures. The third patient had the appearance of bicoronal synostosis, with a patent suture on one side. They have had good results from their craniofacial reconstructions at 24, 12, and 6 months' follow-up. CONCLUSIONS: We have no explanation for these interesting findings.

Bristol RE; Krieger MD; McComb JG

2011-01-01

117

Suture Anchor Arthroplasty for Thumb Carpometacarpal Osteoarthritis.  

Science.gov (United States)

To describe a technique termed Suture Anchor Arthroplasty' (SAA), for thumb carpometacarpal joint osteoarthritis and to report the clinical results. SAA is a surgical technique similar to Ligament Reconstruction Tendon Interposition' (LRTI) Arthroplasty, ...

N. L. Taylor R. Strauch

2004-01-01

118

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

UK PubMed Central (United Kingdom)

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

Albers W; Geldmacher J; Giedl H; Beyer W

1982-03-01

119

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

Science.gov (United States)

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

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

1982-03-01

120

Production and properties of polypropylene track membranes  

International Nuclear Information System (INIS)

This paper describes the results of the method of manufacturing of the polypropylene track membranes produced by physicochemical treatment under irradiation of accelerated heavy ions of polymer films. The developed method allows one to produce membranes 0.1-0.2 ?m in diameter and more with an improved structural and physicochemical properties. Polypropylene track membranes of a novel sample are characterized by high homogeneity of pore sizes in magnitude, considerable mechanical strength, increased thermostability and resistance in aggressive media. It opens new fields for their usage. 16 refs., 5 figs., 4 tabs

1996-01-01

 
 
 
 
121

Synthesis of polypropylene fabric with sulfonate groups  

International Nuclear Information System (INIS)

To synthesize sorption-active polymer fabric with strong acid sulfonate groups graft copolymerization of sodium styrenesulfonate and acrylic acid monomers onto non-woven polypropylene fabric has been carried out from binary monomer mixtures by applying electron-beam pre-irradiation method in air. The influence of co-monomer composition, absorbed dose, Mohr's salt additive on monomer mixture grafting process has been investigated. The kinetics of the grafting process at 50 and 70 deg. C has been studied, and the Fourier transform infrared spectra of the appropriate samples have been analyzed. The ion-exchange characteristics of the resultant sorption-active polypropylene fabric were determined.

2008-01-01

122

Subscapularis repair with the suture shuttle loop technique.  

UK PubMed Central (United Kingdom)

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

Nystrom S; Fagan P; Vedder K; Heming J

2013-02-01

123

Subscapularis repair with the suture shuttle loop technique.  

Science.gov (United States)

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

2013-01-11

124

Chronic complaints after simple sutured repair for umbilical or epigastric hernias may be related to recurrence.  

UK PubMed Central (United Kingdom)

PURPOSE: Umbilical and epigastric hernia repairs are minor, but are commonly conducted surgical procedures. Long-term results have only been sparsely investigated. Our objective was to investigate the risk of chronic complaints after a simple sutured repair for small umbilical and epigastric hernias. METHODS: A retrospective cohort study with a 5-year questionnaire and clinical follow-up was conducted. Patients undergoing primary elective, open non-mesh umbilical or epigastric sutured hernia repair were included. Patients completed a structured questionnaire regarding chronic complaints during work and leisure activities using a verbal rating scale. The primary outcome was chronic complaints. RESULTS: A total of 295 patients were included for analysis after a median of 5.0-year (range 2.8-8.0) follow-up period. Follow-up results were achieved from 262 of the included patients (90 % response rate). Up till 5.8 % of the patients reported moderate or severe pain and discomfort. Work and leisure activities were restricted in 8.5 and 10.0 % of patients, respectively. Patients with chronic complaints had a higher incidence of recurrence (clinical and reoperation), than patients with none or mild complaints (78.6 vs. 22.2 % (P?suture (20.1 %) compared with non-absorbable suture repair (4.2 %) (P?sutured umbilical or epigastric repair was in the level of 5.5 % and could in part be explained by recurrence. Furthermore, absorbable suture should be omitted to reduce risk of recurrence.

Westen M; Christoffersen MW; Jorgensen LN; Stigaard T; Bisgaard T

2013-09-01

125

The Use of Barbed Suture in Hysterectomy and Myomectomy.  

UK PubMed Central (United Kingdom)

Standard sutures used in vaginal cuff reapproximation in total laparoscopic hysterectomies and hysterotomy closure in myomectomies require knot placement and tensioning of the suture throughout the closure. This may contribute to wound dehiscence, increased blood loss, and ischemia of tissue surrounding the knots. In 2004, the United States Food and Drug Administration approved the Quill™ bidirectional barbed suture (Angiotech Pharmaceuticals, Inc., Vancouver, BC, Canada)(Fig. 1). In January 2007, the suture was introduced in the United States. The emergence of the bidirectional barbed suture has significantly affected minimally invasive surgery. Initially used by orthopaedic and plastic surgeons, barbed suture has allowed for the tedious task of knot tying to fade away. Following the introduction of the bidirectional barbed suture, the FDA approved the V-Loc™ unidirectional suture (Covidien, Mansfield, MA)(Fig. 2). The utility of the barbed suture has been instrumental in laparoscopic myomectomy and total laparoscopic hysterectomy. As barbed suture is easily utilized using the same laparoscopic ports, needle drivers, and graspers, the surgeon does not require a third hand to facilitate laparoscopic suturing. The barbs minimize tissue recoil and do so with accurate soft tissue approximation, achieving hemostasis without the use of locking and figure eight sutures. Barbed suture allows for a shorter operative time, as there is an ease of suturing without the complication of knot tying. Barbed sutures are essential tools in the modern laparoscopist's toolbox.

Manoucheri E; Einarsson JI

2013-08-01

126

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

Science.gov (United States)

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

127

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

UK PubMed Central (United Kingdom)

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.

Pietschmann MF; Fröhlich V; Ficklscherer A; Hausdorf J; Utzschneider S; Jansson V; Müller PE

2008-05-01

128

Pullout strength of knotless suture anchors.  

UK PubMed Central (United Kingdom)

PURPOSE: Suture anchors are used consistently for repairs of soft tissues, especially around the glenohumeral joint. These anchors can be used either arthroscopically or in an open procedure to anatomically restore the labrum and capsular tissues to the glenoid after avulsion injuries (Bankart lesion). The purpose of this study was to analyze the pullout strength of a new knotless suture anchor (Mitek Knotless Suture Anchor; Mitek, Norwood, MA) compared with 2 commercially available suture anchors that require knots to be tied (Mitek Panalok 3.5-mm Anchor and Mitek GII Quick Anchor). TYPE OF STUDY: Randomized cadaveric study. METHODS: Three groups of 10 anchors were tested on 15 fresh-frozen cadaveric glenoids. Two anchors were affixed to the anterior glenoid in subchondral bone, 1 each from 2 groups. In this way, the variance of bone density among groups was minimized. The anchors requiring knots were fixed to the glenoid and tied to a ring using a Duncan knot with 3 half-hitches alternating posts. The Knotless Anchor was looped through the ring and anchored into the glenoid as described by the manufacturer. All constructs were then tested for tensile strength on an Instron machine (Canton, MA) using a crosshead speed of 200 mm/min. Ultimate failure was defined as complete failure of the construct (either suture breakage or anchor pullout). Data were then analyzed for statistical significance using analysis of variance analysis among the 3 groups, and a 2-tailed t test for statistical significance among groups. RESULTS: The average failure under tensile load for the GII, Panalok, and Knotless Anchors were 471.5 N, 432.8 N, and 650.0 N, respectively. Statistical analysis showed a statistical difference between the Knotless Anchor and the GII and Panalok sutures ( P = .02). Two-tailed t tests between the Knotless Anchor and the GII or Panalok Anchors were also significant (P = .02 and P = .02, respectively). Observations included a large standard deviation within groups. This is thought to result from the variation in bone density because markedly lower tensile loads were recorded for those anchors that pulled out from the bone before suture failure. CONCLUSIONS: The Knotless Suture Anchor is a statistically stronger construct with respect to tensile loads. It appears to be a viable option for any type of soft-tissue repair around the glenoid. CLINICAL RELEVANCE: Because the knot in suture repair is consistently the weakest point in the construct and because of the difficulty in tying knots arthroscopically, the Knotless Suture Anchor appears to be a stronger and easier method for both arthroscopic and open Bankart repair, with or without capsular shift.

Leedle BP; Miller MD

2005-01-01

129

THE EFFECT OF MALEATED POLYPROPYLENE (MAPP) ON THE MECHANICAL PROPERTIES OF KENAF CORE – POLYPROPYLENE COMPOSITES  

Directory of Open Access Journals (Sweden)

Full Text Available The manufacturing of kenaf core fibre – polypropylene composites with treated and non-treated maleated polypropylene (MAPP) was fabricated. Commercial MAPP (epolene 43) was used to determine MAPP’s effectiveness as a coupling agent for kenaf fibre-composites. The mixturing between kenaf, PP and MAPP was done in an internal mixer machine to produce a pellet. A Kenaf core- polypropylene composite sample was manufactured using a compression moulding method on the kenaf and polypropylene (PP) pellets. The tensile, flexural and impact of the epolene 43 treated composite samples were better than those of the untreated composites. Scanning electron micrograph (SEM) proved that the interfacial region of treated composite board shows good interaction among kenaf’s wood fibre and PP components.

MOHAMAD JANI SAAD

2012-01-01

130

Radiothermoluminescence of polyethylene and polypropylene mixtures  

International Nuclear Information System (INIS)

The influence of the composition of polyethylene and polypropylene mixture on relaxational behaviour of the composition was studied by the method of radiothermoluminescence. The samples were irradiated by 60Co ?-radiation with absorbed dose rate of 1 MGy. It is shown that the sophisticated spectrum of molecular relaxation is related to structural transitions in three temperature ranges. 6 refs.; 1 tab.

1994-01-01

131

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

UK PubMed Central (United Kingdom)

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

Gargallo A; Arines J; Acosta E

2013-02-01

132

Simple continuous suture versus continuous horizontal mattress suture for plication of abdominal fascia: which is better?  

UK PubMed Central (United Kingdom)

BACKGROUND: Abdominal fascia plication using a simple continuous suture can sometimes cause tears in the fascia. This problem can be circumvented when the continuous horizontal mattress suture is used. No data exist from comparing the two suturing techniques. The aim of this study was to examine which technique can potentially cause greater tissue damage. The time required to perform each type of suture was also recorded. METHODS: Wound closure pads were plicated using the simple continuous and continuous horizontal mattress techniques performed by a single operator using Ethilon 2-0 nylon sutures. To verify their resilience, plastic bags were inflated beneath the pads to 30, 60, and 120 mmHg and tears were recorded. The time needed to perform the procedures was recorded using a stopwatch. RESULTS: Mean time for the continuous vertical mattress suture was 87 s and for the simple continuous suture 116 s. Tears in the pad that was plicated with the simple continuous pattern were significantly longer than those in the pad plicated with the continuous horizontal mattress pattern (fissure mean length ± SD = 3.958 ± 0.157 vs. 2.736 ± 0.157, respectively, p < 0.001). This finding was true for each of the three measured pressures (fissure mean length for 30 mmHg was 3.40 ± 1.807 vs. 2.12 ± 1.709 cm; for 60 mmHg, 3.94 ± 2.90 vs. 2.90 ± 1.893 cm; and for 120 mmHg, 4.54 ± 1.924 vs. 3.19 ± 2.110 cm; p < 0.001). CONCLUSIONS: Continuous horizontal mattress pattern sutures were found to be superior to simple continuous pattern sutures in the suggested model, in terms of suturing time and damage to the pad. Further research in human subjects is still required. LEVEL OF EVIDENCE II: This journal requires that authors assign a level of evidence to each article.

Weissman O; Zmora N; Rozenblatt SM; Tessone A; Nardini GG; Zilinsky I; Winkler E; Haik J

2012-10-01

133

Mechanical performance of gamma irradiated surgical sutures  

International Nuclear Information System (INIS)

Surgical sutures are medical devices made of natural or synthetic polymeric materials that, due to its end-use, have to be sterilized. Historically, the sterilization by heat or using ethylene oxide had presented so numerous drawbacks that today the non-pollutant radiation sterilization has become a well established sterilization process, that brings, environmental, technical, and economical advantages. The amount of irradiation doses required for sterilization of health care products is 25 kGy in most instances to achieve the necessary sterility assurance level. As high energy radiation produces modifications in the molecular structure of organic materials with changes in its mechanical properties, the aim of this work was to evaluate the mechanical behavior of surgical sutures under irradiation. Silk, polyamide and catgut sutures were gamma irradiated up to doses of 50 kGy in an industrial irradiation sterilization plant. Afterwards, these sutures were mechanical tested for tensile strength under knot following the specifications of the NBR13904 draft standard, using the CTRD-INSTRON at IPEN. The mechanical lab results show that sutures made of Silk and Polyamide do not present any change in their mechanical performance up to the dose of 50 kGy. On the other hand, Catgut present mechanical stability up to 30 kGy and afterwards, a slight decrease in its tensile strength was detected. (author)

2000-01-01

134

[Blepharoplasty: to suture or to use cyanoacrylate?].  

UK PubMed Central (United Kingdom)

OBJECTIVE: To study the safety and surgical time required when using the tissue adhesive 2-ethyl-cyanoacrylate compared with conventional suture in upper lid blepharoplasty. METHOD: A retrospective study was performed on 40 eyes of 20 patients who underwent bilateral upper lid blepharoplasty. In 7 patients, continuous non-absorbable suture (6-0 nylon monofilament Ethilon(®), Ethicon Inc., Somerville, NJ) was used for closure of the incision and in 13 patients 2-ethyl-cyanoacrylate (Epiglue(®), Meyer -Haake, Germany) was used. The variables studied were intraoperative time required to close the incision, the cost of the material used and the incidence of infections and suture dehiscence. RESULTS: The average time taken to close the incision was 6.069 minutes with cyanoacrylate and 11.914 minutes with conventional suture (P<.05). The price of surgical material used was practically similar. No cases of infection or wound dehiscence were found. CONCLUSION: The closure of the incision in upper lid blepharoplasty using 2-ethyl-cyanoacrylate is a safe, effective, and faster, but not less expensive method than conventional suture.

Suriano MM; Stirbu O; Pérez M D; Serra Segarra M

2011-03-01

135

Laparoscopic fascial suture repair of parastomal hernia.  

UK PubMed Central (United Kingdom)

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

Zia K; McGowan DR; Moore E

2013-01-01

136

Transcutaneous lower blepharoplasty, painless suture removal.  

UK PubMed Central (United Kingdom)

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

De Vita R; Buccheri EM

2013-09-01

137

Differential suture loading in an experimental rotator cuff repair.  

UK PubMed Central (United Kingdom)

BACKGROUND: Repairs of large rotator cuff tears often fail to heal. A possible factor in these failures is excessive tension in the repair sutures, causing them to pull through the tendon. HYPOTHESIS: Arm positions encountered during early rehabilitation after cuff repair can dramatically increase the relative tension in the different sutures of the cuff repair. STUDY DESIGN: Controlled laboratory study. METHODS: In a cadaver model, a 4-suture supraspinatus repair was carried out with transosseous sutures. After the repair, the arm was placed in 12 different positions. The tension in each suture was monitored using individual load cells. RESULTS: When the arm was externally rotated relative to the plane of the scapula, the tension in the anterior suture was over 10 times that in the posterior suture (P < .001). When the arm was internally rotated, the tension in the posterior suture was over 10 times that in the anterior suture (P < .0005). When the arm was in neutral rotation, there was no significant difference in the suture tension. CONCLUSIONS: This study is the first report of direct suture tension measurement after a model rotator cuff repair. In this model, 30 degrees of either internal or external rotation of the arm in relation to the plane of the scapula created substantial imbalances in the tension between the most anterior and most posterior sutures of a supraspinatus repair, regardless of the position of abduction. CLINICAL RELEVANCE: Avoiding external rotation stretching during the healing of supraspinatus repairs may prevent tension overload in the critical anterior suture.

Howe C; Huber P; Wolf FM; Matsen F 3rd

2009-02-01

138

Relaxing incisions with compression sutures for control of astigmatism after penetrating keratoplasty.  

UK PubMed Central (United Kingdom)

BACKGROUND: Ten per cent of patients with persisting postoperative astigmatism following penetrating keratoplasty (PK) require surgical re-intervention, despite an otherwise "successful" transplant. Relaxing incisions (RIs) in combination with compression sutures seem to be the preferable procedure. However, poor predictability and lack of long-term experience complicate the issue. Here we report the 2-year follow-up results of 25 patients with high PK astigmatism treated by means of RIs and compression sutures. METHODS: Commonly, free-handed RIs were placed at the graft-host interface and 10-0 nylon compression sutures were placed perpendicular to the incisions. PK sutures had been removed no less than 4 months prior to refractive surgery. RESULTS: Nineteen eyes regained a functional vision of > or = 0.4. The net decrease in astigmatism was 6.1 +/- 4.3 D (47 +/- 21%). The mean vector-corrected change in astigmatism was 13.1 +/- 5.7 D. Cylinder axis variation was reasonably low, with a correlation of attempted versus achieved axis of r = 0.85. Within the first 3 months after operation the induced astigmatism regressed by, on average, 5.5 +/- 4.3 D, making intraoperative overcorrection necessary. As an inevitable side effect, refractive procedures resulted in a myopic shift (4.7 +/- 6.9 D) in spherical equivalence. CONCLUSION: RIs and compression sutures are very useful in reducing postkeratoplasty astigmatism if correction of extremely high cylinder (> 10 D) is not intended. However, predictability still remains unsatisfactory and more than one operation may be required.

Jacobi PC; Hartmann C; Severin M; Bartz-Schmidt KU

1994-09-01

139

Polypropylene resin for manufacturing medical syringe  

UK PubMed Central (United Kingdom)

This invention is polypropylene resin used for making medical injector. The resin is propene and ethane atactic multipolymer, the ethane content is 0.5-5wt%. The resin contains transparent nucleating agent, acid neutralizer and antioxidant. The weigh ratios are: propene ethane atactic multipolymer/transparent nucleating agent=100/(0.08-0.40)propene ethane atactic multipolymer/ acid neutralizer=100/(0.01-0.10) propene ethane atactic multipolymer/antioxidant=100/(0.02-0.30). The transparent nucleating agent is sorbitol or organic phosphate compound, the acid neutralizer is one of calcium stearate or hydro-saponite or the mixture of the two, the antioxidant is one of or mixture of hindered phenol and phosphate ester. The polypropylene resin provided by this invention has good heat endurance, intension and tenacity.

TAO HONG; CHEN HAILIN; LIU YONG; DONG CHAO; LU GUOHUA; JIANG ZHONGHUI; MOU DAN; YANG HUIHUA; GAO GUOQIANG

140

Polypropylene resin for manufacturing medical transfusion container  

UK PubMed Central (United Kingdom)

This invention is polypropylene resin used for making medical transfusion container. The resin is propene and ethane atactic multipolymer, the ethane content is 0.5-4wt%, the melting temperature is 140-165deg.C, the flowing speed is 1.0-4.1g/10min. the resin contains acid neutralizer and antioxidant, propene ethane atactic multipolymer/acid neutralizer=100/(0.01-0.10)(weight ratio) propene ethane atactic multipolymer/antioxidant=100/(0.02-0.30)(weight ratio). The acid neutralizer is one of calcium stearate or hydro-saponite or the mixture of the two, the antioxidant is one of or mixture of hindered phenol and phosphate ester. The polypropylene resin provided by this invention not only has good heat endurance, intension and tenacity, but also has better transparency.

TAO HONG; CHEN HAILIN; LIU YONG; DONG CHAO; LU GUOHUA; JIANG ZHONGHUI; MOU DAN; YANG HUIHUA; GAO GUOQIANG

 
 
 
 
141

A simple sterile polypropylene fingernail substitute.  

UK PubMed Central (United Kingdom)

Traumatic nail injuries are often observed in clinical practice. Usually the fingernail can be preserved, cleaned and disinfected in order to use it in the reconstructive procedure. However, in some cases the nail can be avulsed and lost or too damaged to be used. In cases when the nail is not available it should be replaced by a substitute in order to protect nail bed and avoid adherences along the proximal nail bed and the nail fold. Furthermore the substitute serves to protect the tender nail bed from painful stimuli during the healing process. We used, as fingernail substitute, a polypropylene sheet in eight patients with fingernail avulsion or disruption. The polypropylene foil was trimmed reproducing the profile of the avulsed fingernail and thinned at the proximal edge to reduce thickness in order to ease the insertion into the nail fold. A small hole was then created in the center of the foil to allow blood drainage. The substitute was usually removed one month after the application. In our clinical experience we had not complications related to the polypropylene device. The new fingernail had good cosmetic appearance in most cases and all the patients reported a good protection of the fingertip during the healing period. The substitute used in this series is sterile, inexpensive and easily available in emergency and elective operatory theater. This polypropylene foil is flexible and can be shaped and adapted to the nail curvature radius. The substitute used in our clinical series protected the nail bed during healing until the growth of the new fingernail and respected our functional expectations.

Tos P; Artiaco S; Coppolino S; Conforti LG; Battiston B

2009-06-01

142

Degradation of polypropylene carbonate through plasmonic heating.  

UK PubMed Central (United Kingdom)

We report the thermal degradation of a solid film of polypropylene carbonate, driven by the photothermal effect of gold nanoparticles. We provide characterization of the products of this chemical reaction and use the known activation barrier for this chemical reaction to discuss the temperatures obtained in the film. In addition, we report the efficiency of the reaction as a function of nanoparticle concentration and find nanoparticles to be significantly more effective than an organic dye at driving this reaction.

Haas KM; Lear BJ

2013-06-01

143

Production of stable polypropylene-modified bitumens  

Energy Technology Data Exchange (ETDEWEB)

The paper discusses the use of polypropylene polymers and copolymers as modifiers for road bitumens. The problem of stability during storage for long periods at high temperatures can be solved by adding phosphorus compounds, especially polyphosphoric acid, which changes the bitumen structure from sol to gel. It is demonstrated that the stability of polymer-modified bitumens depends not only on the differences in density and viscosity between bitumen and polymer but also on bitumen structure. 28 refs., 4 figs., 4 tabs.

Giavarini, C.; De Filippis, P.; Santarelli, M.L.; Searsella, M. [Universita di Roma La Sapienza, Roma (Italy). Dip. Ingegneria Chimica

1996-05-01

144

Double-armed suture package having ramped needle park  

UK PubMed Central (United Kingdom)

A folder package for surgical sutures. The package has a base panel, a foldably connected cover panel, a foldably connected closure panel, a foldably connected end panel, and a ramp structure (170). The package also has at least one needle/suture park mounted to the base panel. The ramp structure is mounted adjacent to the needle/suture park and allows sutures to pass over the park without getting hung-up on or in the park.

Cerwin Robert James; Transue Deborah M.

145

Radiosterilization of surgical suture materials. Review of present knowledge  

Energy Technology Data Exchange (ETDEWEB)

In addition to a historical survey, the paper deals with basic microbiological aspects of radiation sterilization, especially with regard to absorbable suture materials, and with the radiation effects on the physical, mechanical, chemical and biological properties of suture materials. Experimental and clinical experience with the application of radiosterilized suture materials is presented. The effects of irradiation on nonabsorbable suture materials, some materials for foil packaging and alcoholic preservative solutions are also discussed.

Buric, L. (Leciva, Dolni Mecholupy (Czechoslovakia))

1981-10-01

146

Another cause of surgical needle holder damage to surgical sutures.  

UK PubMed Central (United Kingdom)

The sharp edges of the box lock of the needle holder can inadvertently damage the suture during instrument ties. Compression of a monofilament nylon suture between the sharp edges of the box lock of a surgical needle holder damages the suture, reducing its breaking strength. This adverse effect has been eliminated by one manufacturer whose needle holder box lock has rounded edges and sufficient space to permit passage of the suture.

Annunziata CC; Thacker JG; Woods JA; Edlich RF

1996-03-01

147

EVALUATION OF COMPOSITE POLYPROPYLENE FIBRE REINFORCED CONCRETE  

Directory of Open Access Journals (Sweden)

Full Text Available Improvements in fly ash based concrete strength in compression and flexural direction are the main objectives of this study. The compressive and flexure strength of concrete for various mixtureproportions of concrete containing the inclusions of different percentage of polypropylene fibers from 0% to 0.3% and fly ash replacement levels at 25% , 50% of fly ash were investigated. The experimental test results showed that PP fibers possess increased extensibility and tensile strength, both at first crack and at ultimate, particular under flexural loading; and the fibers were able to hold the matrix together even after extensive cracking. The net result of all these is to impart to the fiber composite pronounced post – cracking ductility which is absence of ordinary concrete. To provide a basis for comparison, reference concrete specimens were cast without polypropylene fiber. The experimental test result showed that the addition of polypropylene fibers at 0.1% volume fraction (Vf) showed a consistent improvement in the concrete strength of 44.50 MPa and 55.50 MPa at 7 and 28 days respectively.

V.M. Sounthararajan; Anshul Jain; Abhishek Kumar Singh; S. Thirumurugan; Dr. A. Sivakumar

2013-01-01

148

Cyclic viscoelastoplasticity of polypropylene/nanoclay composites  

DEFF Research Database (Denmark)

Observations are reported on isotactic polypropylene/organically modified nanoclay hybrids with concentrations of filler ranging from 0 to 5 wt.% in cyclic tensile tests with a stress–controlled program (oscillations between various maximum stresses and the zero minimum stress). A pronounced effect of nanofiller is demonstrated: reinforcement with 2 wt.% of clay results in strong reduction of maximum and minimum strains per cycle and growth of number of cycles to failure compared with neat polypropylene. To rationalize these findings, a constitutive model is developed in cyclic viscoelasticity and viscoplasticity of polymer nanocomposites. Adjustable parameters in the stress–strain relations are found by fitting experimental data. The model correctly describes the growth of the ratcheting strain and shows that fatigue failure is driven by a pronounced increase in plastic strain in the crystalline phase. To assess the influence of loading conditions on the changes in the material parameters, experimental data on polypropylene are studied in cyclic tests with a strain–controlled program (oscillations between fixed maximum and minimum strains) and a mixed program (oscillations between various maximum strains and the zero minimum stress). Numerical simulation confirms the ability of the model to predict the evolution of stress–strain diagrams with the number of cycles.

Drozdov, A.; Christiansen, Jesper de Claville

2012-01-01

149

Highly Filled Polypropylene Rubber Wood Flour Composites  

Directory of Open Access Journals (Sweden)

Full Text Available In this research, polypropylene composites filled with Hevea Brasilliensis wood flour at filler content up to 60wt% were prepared and investigated in order to determine the effects of polymer melt flow rate (MFR), number of reprocessing times, filler size, and filler content on thermal and mechanical properties. The results reveal that the composites of polypropylene with higher melt flow rate (lower viscosity) provided greater values of flexural and tensile properties. The study additionally exhibits the recyclability potential without losing mechanical properties. Furthermore, both flexural and tensile modulus increased, while both flexural and tensile strength decreased with increasing wood flour contents. In addition, the average particle size of wood flour that was suitable for improving the mechanical properties was approximately 200-300 um. In the last section of the research, the effects of maleic anhydride grafted polypropylene (MAPP) coupling agent were investigated. It is worth noting that, the flexural strength and tensile strength of highly filled composites with MAPP at 5wt% (based on wood flour) were approximately 110 % and 87% higher than those of the composites without MAPP, respectively. In the presence of coupling agent, the enhancement of interfacial adhesion was analyzed using scanning electron microscope (SEM).

Sarawut Rimdusit; Watanachai Smittakorn; Saroj Jittarom; Sunan Tiptipakorn

2011-01-01

150

SHAPED SUTURE CLIP, APPLIANCE AND METHOD THEREFOR  

UK PubMed Central (United Kingdom)

The suture clip (10) includes a pair of plates (12, 14) joined together at one end to form a vertex (18) having an acute angle (16). Each plate, at its remote terminal end (21, 23), defines an inwardly facing hook (20, 22). The hook end members establish a clip mouth (25) slightly larger than the diameter of the suture thread such that when the thread is passed through the clip mouth, the thread cannot easily escape entrapment from the central region of the clip. The suture clip may be C-shape, V-shape, broken leg V-shape, heart shape or pentagonal shape. In another embodiment, the clip is a closed loop (510) or elliptical in shape. To enhance operability, the hooks (20, 22) on the C, U or V shape sutures are disposed on tabs (30, 32) which are laterally displaced with respect to each other such that, upon collapse and closure of the clip plates, the tabs interleave each other and interlock over the opposite clip plate.

LEVINSON Melvin E.; FLUGRAD Russell C.; DROST Michael J.; KALAT Edward A.

151

Needle and suture contamination in strabismus surgery  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Objective: To evaluate the level of bacterial contamination of needles and sutures used in strabismus surgery. Material and Methods: Strabismus surgery was performed on 30 eyes of 20 patients in our clinic between January 2004 and June 2004. Preoperative site preparation included installation of 5% ...

Betül Tu?cu; Seyhan Ördekçi; F?rat Helvac?o?lu; Nazire Terzi; Sad?k ?encan

152

Transscleral suturing of the implantable miniature telescope.  

UK PubMed Central (United Kingdom)

UNLABELLED: A technique is described for transscleral suturing of the implantable miniature telescope device for end-stage age-related macular degeneration. It provides stabilization and centration of the implantable miniature telescope device in the case of capsule rupture or severe zonular dialysis. FINANCIAL DISCLOSURE: The author has no financial or proprietary interest in any material or method mentioned.

Farid M

2013-07-01

153

Suture remover and continuous band scissors  

UK PubMed Central (United Kingdom)

An improved surgical suture remover is formed of a single elongated strip of resiliently flexible material having a bend substantially midway in its elongation to define first and second shanks respectively carrying a blade and a shearing portion at their corresponding ends. The blade includes a cutting section, and the shearing portion includes a cutting edge, and the blade and shearing portion are pivotally connected for movement of the cutting section and cutting edge toward and away from each other along a cutting plane to cooperatively sever a suture therebetween. An elongated suture gripping element unitarily depending from the shearing portion includes a contact area for suture gripping contact with the cutting section during an operating stroke or jaw closure of the instrument. In another embodiment there is a cutting blade and a shear blade forming a scissors, with each blade having an elongated raised rib, and an abutment shoulder. The ribs render the blade tips inflexible and bow the blades relative to each other, in order to provide edge-to-edge contact between the blades.

LASNER JEFFREY I; ALEIXO FRANCISCO H

154

Paralimbal compression suture for Molteno implants.  

UK PubMed Central (United Kingdom)

When a Molteno implant is being inserted, the silicone tube occasionally can be misdirected anteriorly, bringing the end of the tube dangerously close to the corneal endothelium. A paralimbal compression suture of 8-0 nylon may redirect the tube more posteriorly, preventing such contact.

Allinson RW

1991-12-01

155

The evolution of suture anchors in arthroscopic rotator cuff repair.  

Science.gov (United States)

The advancement of suture anchor design and technology has fostered the transition from open to arthroscopic rotator cuff repair. Current suture-bridging constructs have greatly surpassed the biomechanical strength parameters of transosseous repairs and have shown impressive healing rates after arthroscopic rotator cuff repair. This review describes this evolution and discusses the important characteristics of suture anchors. PMID:23876609

Denard, Patrick J; Burkhart, Stephen S

2013-07-19

156

The evolution of suture anchors in arthroscopic rotator cuff repair.  

UK PubMed Central (United Kingdom)

The advancement of suture anchor design and technology has fostered the transition from open to arthroscopic rotator cuff repair. Current suture-bridging constructs have greatly surpassed the biomechanical strength parameters of transosseous repairs and have shown impressive healing rates after arthroscopic rotator cuff repair. This review describes this evolution and discusses the important characteristics of suture anchors.

Denard PJ; Burkhart SS

2013-09-01

157

Polypropylene surface modification by entrapment of polypropylene-graft-poly(butyl methacrylate)  

International Nuclear Information System (INIS)

[en] Surface modification of polypropylene was carried out by entraping a copolymer of polypropylene grafted poly(butyl methacrylate) into polypropylene. The effects of structure of copolymers, contact die and content of modifiers on their surface enrichment were studied by attenuated total reflection infrared spectroscopy (ATR-FTIR), contact angle measurements and scanning electron microscopy (SEM). The results indicated that PPw-g-PBMA could diffuse preferably onto the surface and effectively increase the hydrophilicity of PP. Lower content and higher surface energy die were in favor of the copolymer to enrich on the PP surface. PPw-g-PBMA with low PBMA contents, short length of PBMA distributed in PP with smaller phase domains and favored its selective enrichment on the surface of PP, especially at lower loadings in blends. The modified material exhibited excellent solvent-resistance

2008-02-15

158

Bacteria adhere less to barbed monofilament than braided sutures in a contaminated wound model.  

UK PubMed Central (United Kingdom)

BACKGROUND: Previous studies have found fewer clinical infections in wounds closed with monofilament suture compared with braided suture. Recently, barbed monofilament sutures have shown improved strength and increased timesavings over interrupted braided sutures. However, the adherence of bacteria to barbed monofilament sutures and other commonly used suture materials is unclear. QUESTIONS/PURPOSES: We therefore determined: (1) the adherence of bacteria to five suture types including a barbed monofilament suture; (2) the ability to culture bacteria after gentle washing of each suture type; and (3) the pattern of bacterial adherence. METHODS: We created an experimental contaminated wound model using planktonic methicillin-resistant Staphylococcus aureus (MRSA). Five types of commonly used suture material were used: Vicryl™, Vicryl™ Plus, PDS™, PDS™ Plus, and Quill™. To determine adherence, we determined the number of bacteria removed from the suture by sequential washes. Sutures were plated to determine bacterial growth. Sutures were examined under confocal microscopy to determine adherence patterns. RESULTS: The barbed monofilament suture showed the least bacterial adherence of any suture material tested. Inoculated monofilament and barbed monofilament sutures placed on agar plates had less bacterial growth than braided suture, whereas antibacterial monofilament and braided sutures showed no growth. Confocal microscopy showed more adherence to braided suture than to the barbed monofilament or monofilament sutures. CONCLUSIONS: Barbed monofilament suture showed similar bacterial adherence properties to standard monofilament suture. CLINICAL RELEVANCE: Our findings suggest barbed monofilament suture can be substituted for monofilament suture, at the surgeon's discretion, without fear of increased risk of infection.

Fowler JR; Perkins TA; Buttaro BA; Truant AL

2013-02-01

159

Comparação da anastomose traqueal suturada com fio absorvível e inabsorvível em coelhos Comparison between tracheal anastomosis suture with absorbable synthetic thread and with nonabsorbable synthetic thread in rabbits  

Directory of Open Access Journals (Sweden)

Full Text Available Neste trabalho foram comparados aspectos mofológicos e morfométricos da anastomose traqueal em coelhos, com a sutrua realizada por dois fios sintéticos absorvíveis e dois fios sintéticos inabsorvíveis. Os animais foram separados em três grupos iguais de 24 animais (A, B e C), estudos nos 7º, 14º e 28º dias de pós-operatório. Cada grupo foi dividido em quatro subgrupos iguais de seis animais. Após a excisão de três anéis cartilaginosos, a anastomose traqueal foi realizada com o fio de poligalactina 910, polidioxanona, polipropileno ou poliéster. Ao exame macroscópico, verificou-se que ocorreu uma fístula traqueal no 7º dia de pós-operatório na anastomose suturada com o fio de poliéster. A estenose cicatricial ocorreu com maior intensidade e freqüência com os fios de poliéster e polidioxanona, em todos os períodos de observação. No 14º e 28º dias de pós-operatório, verificou-se, à microscopia óptica, reação inflamatória crônica com intensidade maior nas suturas com os fios de poliéster, polidioxanona e polipropileno, nesta ordem, com nítida correlação entre a resposta inflamatória crônica intensa e os maus resultados macroscópicos observados nas anastomoses onde foram utilizados estes fios. Os resultados obtidos permitiram concluir que o fio de poligalactina 910 apresentou os melhores resultados cicatriciais para a anastomose traqueal dos coelhos, seguido pelo fio de polipropileno. Os fios de polidioxanona e poliéster apresentaram os piores resultados para a cicatrização da anastomoseMorphological and morphometric aspects of tracheal anastomosis in rabbits sutured with two absorbable synthetic threads and two nonabsorbable synthetic threads were compared in this study. The animals were divided into three equal groups of twenty-four individuals (A, B, C), for post-operation studies on the 7th, 14th and 28th day. Each group was subdivided into four equal subgroups of six animals. After the excision of three cartilaginous rings, the tracheal anastomosis was sutured with polygalactine 910, polydioxan, polypropylene and polyester thread. The macroscopic examination verified a tracheal fistula on the seventh postoperation day in the anastomosis sutured with polyester. Cicraticial stenosis was most intensive and frequent with polyester and polydioxan threads in all the periods observed. On the fourteenth and twenty-eighth post-operation days, the optical microscopy revealed a chronic inflammatory reaction with higher intensity in sutures with polyester, polydioxan and polypropylene with a clear correlation between intense chronic inflammatory reaction and the macroscopic bad results observed in the anastomoses sutured with such threads. The final results lead to the conclusion that polygalactine 910 provided the best cicratization for tracheal anastomosis in rabbits, followed by polypropylene. Polydioxan and polyester threads provided the worst anastomosis cicratization

César Orlando Peralta Bandeira; Amaury José Teixeira Nigro; Martin Zavadinack Netto; Orlando Ribeiro Prado Filho; Kelston Paulo Sales

2000-01-01

160

Long-term results of a suture burial technique.  

UK PubMed Central (United Kingdom)

PURPOSE: To report the long-term (minimum 24 months of follow-up) results of a scleral suture fixation technique. METHODS: Surgical databases from one surgeon were reviewed for consecutive cases from March 2003 to August 2005 in which the scleral suture fixation technique was used and a minimum follow-up of 24 months was completed. In this study, by knotting the suture onto itself, the author has buried the end and the knot of the suture into the sclera for scleral fixation, to stay put within the sclera. Intraoperative technical complications, postoperative visual outcomes, intraocular pressures, and suture-related complications were evaluated for each patient. RESULTS: A total of 150 scleral-sutured free suture ends were evaluated after a minimum 24 months of follow-up in 75 eyes of 75 patients. No technical or suture-related complications (suture exposure, irritation, granulomas, giant papillary conjunctivitis, suture abscess) were recorded throughout the follow-up period. CONCLUSIONS: Long-term follow-up of the suture burial technique - which allows avoidance of scleral incision, flap, or tunnel formation, as well as patch grafts for scleral fixation of intraocular lenses - showed it to be safe and effective.

Baykara M; Timucin OB

2008-05-01

 
 
 
 
161

Sternum suture material and its manufacturing method  

UK PubMed Central (United Kingdom)

Monofilament wires or threads are woven, becoming a wire with ring forms. The center part of the wire is in a plain weave in a tape form. The material is to be either non-magnetic property material or bio-absorbable material. An automatic weaving machine is utilized to manufacture the wire. The center part of the metal cable is woven with thin metal filaments, and either one end or both ends of the cable are hardened with silver wax to facilitate the attachment of a suture needle to the ends of the cable. Also, the hardened end of the cable is directly processed into a suture needle form. A U-shaped sternum fixing hook and an adjusting screw press and fix the sternum, a piercing tool pierces a hole into the sternum, then sternum suture material is passed through the sternum, then the sternum suture is conducted. The thickness of the base of the sternum fixing hook is set to prevent the needlepoint of the piercing tool from reaching the lung, or a protection plate can be provided. The center part of the wire is made in a U-shape in advance. A straight needle with a wire is fixed, and pierced from below the sternum. Sternum fixing hooks are continuously fixed with ball joints, making a fixing arm and a movable arm, having the function to open and close the incision sides of the sternum. With the above proposal it is possible to provide a smooth and easy-to-handle sternum suture material which does not establish metal fatigue, prevents halation when using the MRI, health insurance can be applied, easier to fasten, less bleeding, prevents vertical gaps of the sternum when closing the sternum. Piercing the sternum can be done easily, precisely, and safely, and then conduct the sternum suture. The operator does not need to remove needles or guide-wires. This is less invasive to the sternum. This invention does not harm the lung. An affordable and convenient manufacturing method can be provided.

KOSEKI TOMOAKI

162

Teaching basic video skills as an aid in laparoscopic suturing.  

UK PubMed Central (United Kingdom)

BACKGROUND: There is a perception among surgeons that performing laparoscopic suturing is unduly difficult. The purpose of this study is to document a program which aides in learning laparoscopic suturing. METHODS: Fourteen volunteer medical students without prior experience were taught laparoscopic suturing. Videoscopic pelvitrainers were utilized for a 2-h training session. Extracorporeal and intracorporeal knot tying was demonstrated utilizing a three-throw square knot. After a 2-h practice session each student's time to complete an extracorporeal and intracorporeal suture was recorded. RESULTS: The average times required for completion were: extracorporeal suture and knot 1 min 54 s; intracorporeal suture and knot 3 min 12 s. CONCLUSIONS: Novice students were able to perform at extra and intracorporeal suturing with 2 h of practice, utilizing a systematic program of teaching basic video skills.

Champion JK; Hunter J; Trus T; Laycock W

1996-01-01

163

Fracture Toughness Studies of Polypropylene- Clay Nanocomposites and Glass Fibre Reinfoerced Polypropylene Composites  

Directory of Open Access Journals (Sweden)

Full Text Available In this paper, a comparative study on the fracture toughness of woven glass fibre reinforced polypropylene, chopped glass fibre reinforced polypropylene and nanoclay filled polypropylene composites is presented. Nanoclays (Cloisite 15A) of 1 wt. % to 5 wt. % were filled in polypropylene (PP) matrix and they were subjected to fracture toughness stu-dies. The specimen with 5 wt. % nanoclay showed 1.75 times and 3 times improvement in critical stress intensity factor (KIC) and strain energy release rate (GIC), respectively, over virgin PP. On the other hand, 3 wt. % nanoclay PP composites showed superior crack containment properties. These structural changes of composite specimens were examined using Transmission Electron Microscopy (TEM) and X-ray diffraction (XRD) methods. It showed that exfoli-ated nanocomposite structures were formed up to 3 wt. % nanoclay, whereas, intercalated nanocomposite structures formed above 3 wt. % nanoclay in the PP matrix. Furthermore, the woven fibre reinforced PP composites demonstrated superior crack resistant properties than that of clay filled nanocomposites and chopped fibre PP composites. However, KIC and GIC values for woven fibre composites were lesser than that of chopped fibre composites. Moreover, KIC and GIC values for both nanoclay filled PP composites and woven fibre composites are comparable even though the clay filled PP demonstrated catastrophic failure. Also, the crack propagation rate of PP-nanoclay composites is comparable to that of chopped fibre composites.

A. Ramsaroop; K. Kanny; T. P. Mohan

2010-01-01

164

Stability of ondansetron stored in polypropylene syringes.  

UK PubMed Central (United Kingdom)

OBJECTIVE: To evaluate the stability of ondansetron hydrochloride undiluted and mixed in dextrose 5% injection or NaCl 0.9% injection during storage in polypropylene syringes when frozen, refrigerated, or at room temperature. DESIGN: Batch quantities of ondansetron 0.25, 0.5, 1.0, and 2.0 mg/mL were prepared and individual doses of 10.5 mg were drawn into polypropylene syringes that were stored at -20 degrees C for up to 3 months, at 4 degrees C for up to two weeks, or at 22-25 degrees C for two days, and various combinations of these conditions. At defined sampling times aliquots were withdrawn from syringes, the solution visually inspected, pH measured, and ondansetron concentration determined by HPLC. Drug loss of > or = 10 percent of the original content of the solution was considered clinically significant. RESULTS: The ondansetron concentration in each solution, regardless of storage conditions, remained above 90 percent of the original concentration at each observation time (range 92-107 percent). No changes in color or clarity of any of the solutions were observed, and only slight fluctuations in pH (< or = 0.05) were noted. CONCLUSIONS: Ondansetron 2 mg/mL undiluted, or at concentrations of 0.25, 0.5, or 1 mg/mL, mixed in dextrose 5% injection or NaCl 0.9% injection was determined to be stable when stored in polypropylene syringes for each storage condition at all time points studied, including the maximum for each: three months at -20 degrees C, followed by 14 days at 4 degrees C, and by 48 hours at 22-25 degrees C.

Casto DT

1994-06-01

165

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

UK PubMed Central (United Kingdom)

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

Rangel-Castilla L; Hwang SW; Jea A; Whitehead WE; Curry DJ; Luerssen TG; Dauser RC

2012-02-01

166

RATE OF SCLEROTOMY SUTURING IN 23-GAUGE PRIMARY VITRECTOMY.  

UK PubMed Central (United Kingdom)

PURPOSE:: To evaluate the rate of sclerotomy suturing in a large series of primary 23-gauge vitrectomies. METHODS:: Retrospective chart review of 23-gauge transconjunctival pars plana vitrectomies performed between 2008 and 2012 in a multisurgeon retina practice. Patients with a history of retinal surgery, combination of vitrectomy and scleral buckling surgery, or intraoperative conversion of a sclerotomy to 20-gauge were excluded from the study. Vitrectomies were divided into two types according to their degree of complexity and intraoperative use of instrumentation. Demographic and clinical data were gathered from the chart. Location and number of sutured sclerotomies were obtained from the operative report. RESULTS:: A total of 589 eyes from 569 patients were included in this study. At least 1 sclerotomy was sutured in 227 eyes (38.5%): 69 (30.4%) had 1 sutured sclerotomy, 52 (22.9%) had 2 sutured sclerotomies, and 106 (46.7%) had 3 sutured sclerotomies. Sclerotomy suturing was significantly related to the surgical technique (P < 0.001), type of tamponade agent (P = 0.048), and complexity of the vitrectomy (P < 0.001). The incidence of postoperative hypotony at Day 1 was 2.2% and all cases returned to normal intraocular pressure at 1 week. There were no recognized complications related to sclerotomies regardless of suturing. CONCLUSION:: The factors that increased the rate of sclerotomy suturing were the absence of tamponade agent and higher complexity of the procedure. There was a high variability in the rate of suturing between the surgeons.

Duval R; Hui JM; Rezaei KA

2013-08-01

167

Automatic Detection of Wild-type Mouse Cranial Sutures  

DEFF Research Database (Denmark)

In the study of craniofacial malformations, the cranial sutures are often of interest. The premature fusion of sutures occurring in e.g. Crouzon and Apert syndrome can lead to asymmetric head shape, enlarged intracranial pressure and blindness. In large population studies of such syndromes, automatic detection of the cranial sutures becomes important. We have previously built a craniofacial, wild-type mouse atlas from a set of 10 Micro CT scans using a B-spline-based nonrigid registration method by Rueckert et al. Subsequently, all volumes were registered nonrigidly to the atlas. Using these transformations, any annotation on the atlas can automatically be transformed back to all cases. For this study, two rounds of tracing seven of the cranial sutures, were performed on the atlas by one observer. The average of the two rounds was automatically propagated to all the cases. For validation, the observer traced the sutures on each of the mouse volumes as well. The observer outperforms the automatic approach by approximately 0.1 mm. All mice have similar errors while the suture error plots reveal that suture 1 and 2 are cumbersome, both for the observer and the automatic approach. These sutures can be hard to detect with the eye. We still believe that overall, the errors are not considerable and by qualitatively estimating the accuracy, the automatic sutures are very close to the observer sutures. Our plan is to improve the results by local feature detection methods.

Ólafsdóttir, Hildur; Darvann, Tron Andre

168

Suture implant component and device for suture implant comprising said component  

UK PubMed Central (United Kingdom)

The component (100) has a body (101) that extends along a central longitudinal axis (X100) and includes an opening (106) to receive a suture thread (130), such that the thread cooperates with the body to form U or V shape. The body is deformable under effect of tension exerted by the thread on a distal end (103) of the body between rest and active configurations. The body includes a tubular or conical deformable wall (112) that is arranged around the axis and deformable in the manner of an accordion when the body passes from the rest configuration to the active configuration. An independent claim is also included for a suture implant device comprising a removable unit for inserting a suture implant component in a bone cavity.

PETERSON DAVID R; OHASHI KEVIN L; SCHLOTTERBACK RYAN D

169

Improved oil spill recovery using polypropylene fabric  

International Nuclear Information System (INIS)

An active boom for recovering oil spills was tested in a tank with diesel fuel, a motor oil, and a heavy crude oil. The boom consisted of a porous pipe wrapped in a polypropylene fabric to which a vacuum was applied. The diesel was recovered at a rate of 29 gal/h per ft2 of fabric surface area (GHPF) using a vacuum of 17 in. of water without any entrained water. The motor oil was recovered at a rate of 2.5 GHPF using a vacuum of 20 in. of water without any entrained water. The crude oil test at a vacuum of 8 in. Hg also resulted in a fluid recovery rate of 2.5 GHPF, but half of the recovered fluid was water. The results suggest that a device presenting a large surface area of polypropylene fabric to a spill of light or medium oil will separate the oil from the water. Uses for the device extend to other situations where oil-water separation is required. 1 ref., 4 figs., 3 tabs.

1993-01-01

170

[Comparison between antibacterial coated suture vs standard suture to prevent the surgical site infections].  

UK PubMed Central (United Kingdom)

The surgical site infections (SSI) still represent an issue, which causes prolonged hospital staying, major costs for both healthcare system and professional insurance. Recent studies enlighten that using the antibacterial agent triclosan® leads to decrease infections rates. In this observational study we compared two groups of patients undergoing scheduled the so called clean surgery. The absence of SSI was assessed in all patients, 30 days later the surgery, through a telephone interview as indicated by the National Group for SSI surveillance protocol. The use of antibacterial sutures shows to be successful in preventing the SSI in comparison to standard sutures, even if results are not statistically significant.

Palma E; Brocanelli N; Luconi A; Cicolini G

2013-01-01

171

Effect of {gamma}-irradiation on commercial polypropylene based mono and multi-layered retortable food packaging materials  

Energy Technology Data Exchange (ETDEWEB)

Irradiation processing of food in the prepackaged form may affect chemical and physical properties of the plastic packaging materials. The effect of {gamma}-irradiation doses (2.5-10.0 kGy) on polypropylene (PP)-based retortable food packaging materials, were investigated using Fourier transform infrared (FTIR) spectroscopic analysis, which revealed the changes happening to these materials after irradiation. The mechanical properties decreased with irradiation while oxygen transmission rate (OTR) was not affected significantly. Colour measurement indicated that Nylon 6 containing multilayer films became yellowish after irradiation. Thermal characterization revealed the changes in percentage crystallinity.

George, Johnsy [Defence Food Research Laboratory, Siddarthanagar, Mysore, Karnataka 570011 (India)]. E-mail: g.johnsy@gmail.com; Kumar, R. [Defence Food Research Laboratory, Siddarthanagar, Mysore, Karnataka 570011 (India); Sajeevkumar, V.A. [Defence Food Research Laboratory, Siddarthanagar, Mysore, Karnataka 570011 (India); Sabapathy, S.N. [Defence Food Research Laboratory, Siddarthanagar, Mysore, Karnataka 570011 (India); Vaijapurkar, S.G. [Defence Laboratory, Ratanada Palace, Jodhpur, Rajastan 342011 (India); Kumar, D. [Defence Laboratory, Ratanada Palace, Jodhpur, Rajastan 342011 (India); Kchawahha, A. [Defence Laboratory, Ratanada Palace, Jodhpur, Rajastan 342011 (India); Bawa, A.S. [Defence Food Research Laboratory, Siddarthanagar, Mysore, Karnataka 570011 (India)

2007-07-15

172

Comparative mechanical analysis of a looped-suture tendon repair.  

UK PubMed Central (United Kingdom)

The in vitro breaking force of a braided nylon looped-suture tendon juncture designed to decrease tying time was compared with the breaking force of the modified Kessler and Bunnell techniques. Repaired with either braided nylon or tetrafluoroethylene, porcine digiti quarti propius tendons were tested to single cycle failure on a MTS hydraulic testing machine. The results showed that the looped-suture technique had a mean breaking force that was statistically indistinguishable from that of the Bunnell technique regardless of suture material. However, the breaking forces for the looped suture and Bunnell techniques were statistically greater for both suture materials when compared with the modified Kessler technique. The resistance to gap formation for the looped suture was found to be intermediate between the Bunnell technique and the modified Kessler technique.

Haddad RJ Jr; Kester MA; McCluskey GM; Brunet ME; Cook SD

1988-09-01

173

Massive obstetric haemorrhage following removal of a cervical suture.  

Science.gov (United States)

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

Howarth, Louise Ann; Sherliker, Sarah

2011-05-10

174

Massive obstetric haemorrhage following removal of a cervical suture.  

UK PubMed Central (United Kingdom)

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

Howarth LA; Sherliker S

2011-01-01

175

Surgical sutures as a means of identifying human remains.  

UK PubMed Central (United Kingdom)

The Food and Drug Administration does not require surgical sutures to be tracked by manufacturer, physician, or patient; thereby, surgical sutures have been of little use to forensic practitioners who are tasked with establishing a positive identification with biological evidence. This study demonstrates the investigative process used to pinpoint suture manufacturers by presenting a case where surgical sutures were a distinctive characteristic that aided in the positive identification of skeletal remains. The suture's manufacturer, construction material and structure, size, and medical use was determined by contacting a local surgical suture and orthopedic implant manufacturer and utilizing publicly available manufacturer websites, which provide catalogs and specific product details. This research was one of many lines of evidence used to establish the positive identification of a 47-year-old male.

Shepherd KL; Walsh-Haney H; Coburn MU

2010-01-01

176

Myomectomy using purse-string suture during cesarean section.  

UK PubMed Central (United Kingdom)

BACKGROUND: Conventionally, myomectomy during cesarean section is reserved only for pedunculated myomas because resection of myomas at the time of cesarean section usually stimulates profuse bleeding. CASES: Thirty-one patients underwent myomectomy using purse-string suture during cesarean section. Myoma could be excised without profuse bleeding, while an assistant maintains strong tension on the purse-string suture around the myoma. The suture was tightened and tied immediately after complete resection of the myoma and then stitches of another purse-string suture were placed alternately with each previous stitch in the inner side of the first suture. We have used this method for more than 3 years and have not observed failures and serious complications, such as late hemorrhage and uterine rupture during a subsequent pregnancy. CONCLUSION: Myomectomy using purse-string suture during cesarean section is a safe, useful, and convenient technique.

Lee JH; Cho DH

2011-03-01

177

Compression sutures in the management of corneal transplant wound infections.  

UK PubMed Central (United Kingdom)

PURPOSE: To report the usefulness of compression sutures in the management of three cases of bacterial wound infections in corneal transplants. METHODS: Interventional case series. RESULTS: All three cases of wound dehiscence and perforation resulting from bacterial wound infections were successfully treated with placement of compression sutures with concurrent topical antibiotic treatment. CONCLUSION: The placement of compression sutures is a successful surgical technique to reestablish corneal transplant wound integrity compromised by infection.

Meisler DM; Jeng BH

2001-10-01

178

Degradation study of polypropylene (PP) and bioriented polypropylene (BOPP) in the environment  

Scientific Electronic Library Online (English)

Full Text Available Abstract in english Polymers are vastly employed for numerous purposes in different industrial segments and generate soaring quantities of discarding in the environment. This research analyzed the degradability/biodegradability of polypropylene films (PP) and Bioriented polypropylene (BOPP) polymers after 11 months interred in the São Giácomo landfill in Caxias do Sul. Comparing the buried PP film to a sample of virgin PP, two peaks of degrading activity appeared at the TG curve as well as (more) structure modification typified by occurrence of new absorption bands at FTIR, which can be credited to changes in crystallinity. Thermal analysis carried out on the buried PP and BOPP showed decreases in the percentage of crystallinity due to chain scission. The major reduction was observed in the PP, since its crystallinity is a consequence of polymerization instead of chain orientation processes, as in BOPP. Cracks and erosion of the polymer surface were detected in both PP and BOPP, indicating degrading processes by microorganisms.

Longo, Carina; Savaris, Michele; Zeni, Mára; Brandalise, Rosmary Nichele; Grisa, Ana Maria Coulon

2011-12-01

179

Collagen/Polypropylene composite mesh biocompatibility in abdominal wall reconstruction.  

UK PubMed Central (United Kingdom)

BACKGROUND: Intraperitoneal placement of polypropylene mesh leads to extensive visceral adhesions and is contraindicated. Different coatings are used to improve polypropylene mesh properties. Collagen is a protein with unique biocompatibility and cell ingrowth enhancement potential. A novel acetic acid extracted collagen coating was developed to allow placement of polypropylene mesh in direct contact with viscera. The authors' aim was to evaluate the long-term influence of acetic acid extracted collagen coating on surgical aspects and biomechanical properties of polypropylene mesh implanted in direct contact with viscera, including complications, adhesions with viscera, strength of incorporation, and microscopic inflammatory reaction. METHODS: Forty adult Wistar rats were divided into two groups: experimental (polypropylene mesh/acetic acid extracted collagen coating) and control (polypropylene mesh only). Astandardized procedure of mesh implantation was performed. Animals were killed 3 months after surgery and analyzed for complications, mesh area covered by adhesions, type of adhesions, strength of incorporation, and intensity of inflammatory response. RESULTS: The mean adhesion area was lower for polypropylene mesh/acetic acid extracted collagen coating (14.5 percent versus 69.9 percent, p < 0.001). Adhesion severity was decreased in the experimental group: grades 0 and 1 were more frequent (p < 0.04 and p < 0.002, respectively) and grade 3 was less frequent (p < 0.0001). An association between adhesion area and severity was found (p < 0.0001). Complications, strength of incorporation, and intensity of inflammatory response to the mesh were similar. CONCLUSIONS: Visceral adhesions to polypropylene mesh are significantly reduced because of acetic acid extracted collagen coating. The collagen coating does not increase complications or induce alterations of polypropylene mesh incorporation.

Lukasiewicz A; Skopinska-Wisniewska J; Marszalek A; Molski S; Drewa T

2013-05-01

180

Arthroscopic all-inside lateral meniscus suture using posterolateral portal.  

UK PubMed Central (United Kingdom)

A new arthroscopic all-inside suture for lateral meniscus posterior horn tear using a single posterolateral portal is described. A lateral meniscus posterior horn peripheral longitudinal tear is often seen with anterior cruciate ligament injury or discoid lateral meniscus tear. Conventional repair methods, such as arthroscopic inside-out, outside-in, or all-inside sutures, can be cumbersome and technically demanding. Our all-inside suture using the posterolateral portal allows thorough visualization of the posterolateral structures, excellent coaptation of torn meniscus, strong knot tightening, and avoidance of inadvertent cartilage injury. The arthroscope is inserted through the anteromedial portal and reaches the posterolateral compartment by a transcondylar approach. A suture hook is introduced into the posterolateral portal without a cannula, penetrates posterior peripheral rim, crosses the tear, and passes through mobile torn fragment. A large amount of No. 0 PDS is passed, so that it curls up inside the joint. After the suture hook is removed, a suture retriever is inserted through the posterolateral portal to pull out 2 ends of the PDS at the same time. The retrieved suture ends are passed through a knot pusher and a 5.5-mm cannula is introduced over the retrieved suture materials for the SMC knot to be tied. A longitudinal tear of lateral meniscus posterior horn is repaired with 2 to 3 sutures.

Ahn JH; Oh I

2006-05-01

 
 
 
 
181

Arthroscopic all-inside lateral meniscus suture using posterolateral portal.  

Science.gov (United States)

A new arthroscopic all-inside suture for lateral meniscus posterior horn tear using a single posterolateral portal is described. A lateral meniscus posterior horn peripheral longitudinal tear is often seen with anterior cruciate ligament injury or discoid lateral meniscus tear. Conventional repair methods, such as arthroscopic inside-out, outside-in, or all-inside sutures, can be cumbersome and technically demanding. Our all-inside suture using the posterolateral portal allows thorough visualization of the posterolateral structures, excellent coaptation of torn meniscus, strong knot tightening, and avoidance of inadvertent cartilage injury. The arthroscope is inserted through the anteromedial portal and reaches the posterolateral compartment by a transcondylar approach. A suture hook is introduced into the posterolateral portal without a cannula, penetrates posterior peripheral rim, crosses the tear, and passes through mobile torn fragment. A large amount of No. 0 PDS is passed, so that it curls up inside the joint. After the suture hook is removed, a suture retriever is inserted through the posterolateral portal to pull out 2 ends of the PDS at the same time. The retrieved suture ends are passed through a knot pusher and a 5.5-mm cannula is introduced over the retrieved suture materials for the SMC knot to be tied. A longitudinal tear of lateral meniscus posterior horn is repaired with 2 to 3 sutures. PMID:16651176

Ahn, Jin Hwan; Oh, Irvin

2006-05-01

182

Reacción tisular a materiales de sutura no absorbibles en piel de equinos/ Tissue reaction to nonabsorbable suture materials in horse skin  

Scientific Electronic Library Online (English)

Full Text Available Abstract in spanish Se evaluó clínica e histológicamente el grado de reacción tisular frente a cuatro materiales de sutura no absorbibles (lino, nylon, caprolactam polimerizado y polipropileno), implantados en la piel de 8 equinos. Se determinó clínicamente el edema provocado y la ausencia o presencia de exudado a los 5 y 10 días de haber sido implantados los materiales de sutura, además al 10º día se realizó una biopsia para determinar histológicamente el grado de reacción tisu (more) lar. Los resultados obtenidos mostraron que el lino causó un mayor edema al día 5, mientras que al día 10 el nylon y caprolactam provocaron un menor de edema. Con respecto a la presencia o ausencia de exudado, al día 5 la sutura de nylon fue la única que no presentó exudado en ninguno de los 8 ejemplares, sin embargo, al día 10, salvo un ejemplar que presentó exudado en todos los materiales, el nylon, caprolactam y polipropileno no presentaron exudado. En cuanto a la evaluación histológica tanto el nylon como el caprolactam mostraron menor grado de reacción tisular. En conclusión, el lino resultó tener el mayor grado de reacción tisular durante el presente estudio, y el nylon si bien es similar al caprolactam y polipropileno respecto a la reacción tisular, causó una menor cantidad de equinos con presencia de exudado que los otros materiales utilizados. Abstract in english The degree of tissue reaction of 4 nonabsorbable suture materials (linen, nylon, polymerized caprolactum and polypropylene) implanted into health skin of 8 horses was clinically and histologically evaluated. Cutaneous oedema and absence or presence of the exudation were clinically evaluated 5 and 10 days following suture material implantation. Biopsies were taken to histologically evaluate tissue reaction at 10 days. The results obtained showed that linen caused more oede (more) ma by the 5th day, whereas the nylon and caprolactum had less oedema on the 10th day. With respect to the presence or absence of exudation, nylon was the only material which did not show exudation by the 5th day in any of the 8 samples, but on the 10th day, neither the nylon, caprolactum or polypropylene showed exudation, except one horse that showed exudation for all suture materials. The histological evaluation showed that nylon and caprolactum caused less tissue reaction. In conclusion, linen was found to have a higher degree of tissue reaction in the present study, and nylon although similar to caprolactum and polypropylene in terms of tissue reaction, caused less cases of exudate than the other suture materials used.

Maldonado, F; Muñoz, L; Quezada, M; Briones, M; Urrutia, P

2006-01-01

183

Reacción tisular a materiales de sutura no absorbibles en piel de equinos Tissue reaction to nonabsorbable suture materials in horse skin  

Directory of Open Access Journals (Sweden)

Full Text Available Se evaluó clínica e histológicamente el grado de reacción tisular frente a cuatro materiales de sutura no absorbibles (lino, nylon, caprolactam polimerizado y polipropileno), implantados en la piel de 8 equinos. Se determinó clínicamente el edema provocado y la ausencia o presencia de exudado a los 5 y 10 días de haber sido implantados los materiales de sutura, además al 10º día se realizó una biopsia para determinar histológicamente el grado de reacción tisular. Los resultados obtenidos mostraron que el lino causó un mayor edema al día 5, mientras que al día 10 el nylon y caprolactam provocaron un menor de edema. Con respecto a la presencia o ausencia de exudado, al día 5 la sutura de nylon fue la única que no presentó exudado en ninguno de los 8 ejemplares, sin embargo, al día 10, salvo un ejemplar que presentó exudado en todos los materiales, el nylon, caprolactam y polipropileno no presentaron exudado. En cuanto a la evaluación histológica tanto el nylon como el caprolactam mostraron menor grado de reacción tisular. En conclusión, el lino resultó tener el mayor grado de reacción tisular durante el presente estudio, y el nylon si bien es similar al caprolactam y polipropileno respecto a la reacción tisular, causó una menor cantidad de equinos con presencia de exudado que los otros materiales utilizados.The degree of tissue reaction of 4 nonabsorbable suture materials (linen, nylon, polymerized caprolactum and polypropylene) implanted into health skin of 8 horses was clinically and histologically evaluated. Cutaneous oedema and absence or presence of the exudation were clinically evaluated 5 and 10 days following suture material implantation. Biopsies were taken to histologically evaluate tissue reaction at 10 days. The results obtained showed that linen caused more oedema by the 5th day, whereas the nylon and caprolactum had less oedema on the 10th day. With respect to the presence or absence of exudation, nylon was the only material which did not show exudation by the 5th day in any of the 8 samples, but on the 10th day, neither the nylon, caprolactum or polypropylene showed exudation, except one horse that showed exudation for all suture materials. The histological evaluation showed that nylon and caprolactum caused less tissue reaction. In conclusion, linen was found to have a higher degree of tissue reaction in the present study, and nylon although similar to caprolactum and polypropylene in terms of tissue reaction, caused less cases of exudate than the other suture materials used.

F Maldonado; L Muñoz; M Quezada; M Briones; P Urrutia

2006-01-01

184

Efeitos cardiovasculares e midriáticos da fenilefrina tópica a 2,5 e a 10,0% em voluntários sadios Cardiovascular and pupillary effects of topical ophthalmic 2.5 and 10.0% phenylephrine in healthy volunteers  

Directory of Open Access Journals (Sweden)

Full Text Available OBJETIVO: Comparar os efeitos cardiovasculares e midriáticos da fenilefrina tópica nas concentrações de 2,5 e 10,0%. MÉTODOS: Ensaio clínico do tipo caso controle, randomizado, com auto-emparelhamento. Foram monitoradas a freqüência cardíaca (FC), a pressão arterial (PA) e a midríase em voluntários sadios, com idade entre 18 e 45 anos, após a instilação da fenilefrina a 2,5 e a 10,0% em duas ocasiões diferentes. RESULTADOS: A amostra foi constituída de 28 voluntários, sendo 17 do sexo masculino e 11 do sexo feminino, com a idade média de 26,5 anos. Não foi verificado nenhum padrão de mudanças com relação à freqüência cardíaca e à pressão arterial sistólica. Com relação à pressão arterial diastólica média dos indivíduos, não foi encontrada variação significativa após a instilação da fenilefrina a 2,5% nos tempos de um, cinco, dez e 30 minutos, o que se revelou bem diferente quando do uso da fenilefrina a 10,0%, com a qual houve aumento da pressão arterial diastólica média após cinco e dez minutos, e subseqüente queda após 30 minutos, porém sem significância estatística. A midríase foi maior com a fenilefrina a 10,0% nos dois olhos, sendo a diferença estatisticamente significativa. CONCLUSÕES: Observou-se maior efeito midriático da fenilefrina a 10,0%, quando comparada a 2,5%, com significância estatística. Já com relação aos efeitos cardiovasculares não houve diferença estatística entre as duas concentrações.PURPOSE: To compare the cardiovascular and mydriatic effects of 2.5% and 10.0% phenylephrine. METHODS: A case-control, randomized, crossover clinical trial study. We monitored heart rate (HR), blood pressure (BP) and mydriasis in healthy volunteers aged 18-45 years after the instillation of 2.5% and 10.0% phenylephrine in two different occasions. RESULTS: The sample comprised 28 healthy volunteers, 17 male and 11 female, with a mean age of 26.5 years. No changes in heart rate and systolic blood pressure were observed. No significant variation of the mean diastolic blood pressure was found after 1, 5, 10 and 30- minute instillation of 2.5% phenylephrine. However, with 10.0% phenylephrine, there was an increase in mean diastolic blood pressure after five and ten minutes, followed by a drop after 30 minutes, which was not statistically significant. Mydriasis was more marked in both eyes with a statistically significant difference after instillation of 10.0% phenylephrine. CONCLUSIONS: The mydriatic effect was greater with 10.0% phenylephrine than with 2.5% phenylephrine and the difference was statistically significant. No statistically significant difference was found in relation to cardiovascular effects in both phenylephrine concentrations.

Alberto Diniz Filho; Maria Frasson; Rafael Vidal Mérula; Patrick Reis Morais; Sebastião Cronemberger

2007-01-01

185

POLYPROPYLENE/CLAY NANOCOMPOSITES: SYNTHESIS AND CHARACTERIZATION  

Directory of Open Access Journals (Sweden)

Full Text Available Polypropylene nanocomposites were synthesized by using the method of mixing in the molten state. Nanocomposites were obtained in twin-screw co-rotating extruders and the nanocomposites were prepared with percentage of nanoclay (C2) from 5 wt-%, with and without compatibilizer agent (PP-g-MA). The thermal (DSC, TGA), morphology (XRD, TEM), and dynamical mechanical (DMA) properties of the nanocomposites were characterized. All nanocomposites prepared are in intercalated state as corroborated by XRD and TEM. The Tm and Xc were not affected by the presence of clay, PP-g-MA, or processing support. The incorporation of clay and compatibilizer agent increases the thermal stability and heat deflection temperature (HDT).

MÓNICA A PÉREZ; BERNABÉ L RIVAS; SADDYS M RODRÍGUEZ; ÁLVARO MALDONADO; CAROLA VENEGAS

2010-01-01

186

POLYPROPYLENE/CLAY NANOCOMPOSITES: SYNTHESIS AND CHARACTERIZATION  

Scientific Electronic Library Online (English)

Full Text Available Abstract in english Polypropylene nanocomposites were synthesized by using the method of mixing in the molten state. Nanocomposites were obtained in twin-screw co-rotating extruders and the nanocomposites were prepared with percentage of nanoclay (C2) from 5 wt-%, with and without compatibilizer agent (PP-g-MA). The thermal (DSC, TGA), morphology (XRD, TEM), and dynamical mechanical (DMA) properties of the nanocomposites were characterized. All nanocomposites prepared are in intercalated sta (more) te as corroborated by XRD and TEM. The Tm and Xc were not affected by the presence of clay, PP-g-MA, or processing support. The incorporation of clay and compatibilizer agent increases the thermal stability and heat deflection temperature (HDT).

PÉREZ, MÓNICA A; RIVAS, BERNABÉ L; RODRÍGUEZ, SADDYS M; MALDONADO, ÁLVARO; VENEGAS, CAROLA

2010-12-01

187

Surface properties of polypropylene/organoclay nanocomposites  

International Nuclear Information System (INIS)

Influence of nanoclay amount on surface properties of the nanocomposites was investigated using Fourier transform infrared spectroscopy (FTIR), atomic force microscopy (AFM), contact angle measurement, scanning electron microscopy (SEM) and transmission spectroscopy (TS). Polypropylene based nanocomposites containing various loads of nanoclay were prepared by melt compounding. X-ray diffraction (XRD) characterized the dispersion of nanoclay in polymer matrix. AFM and SEM studies have shown increase in surface roughness by raising the amount of nanoclay. Contact angle measurements of the resultant nanocomposites have also shown improvement in wettability related to disperse part of surface tension. POM images illustrated an increase in the number of spherulite simultaneously with a decrease in their size; this result was also supported by differential scanning calorimetry (DSC).

2011-01-01

188

Development of radiation-resistant medical polypropylene  

International Nuclear Information System (INIS)

In order to develop a radiation resistant polypropylene (PP) which can be sterilized by gamma radiation for medical use, optimal concentrations of various additives in PP were determined by observing the synergistic effect. The radiation durability of the disposable PP syringes prepared by the formulations was investigated. Their chemical and biological safety was also examined in accordance with the test method on the medical appliances stipulated by the Ministry of Health and Social Welfare. The samples with 0.01 % AO and 0.5 % PL showed sufficient radiation durability to maintain the mechanical strength even after 63 day aging at 60 deg C. The results of the chemical tests and the biological safety tests met the requirements of Korean and US pharmacopoeia. The PP medical products manufactured in accordance with the formulations could be sterilizable by radiation. (author)

1990-01-01

189

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

Energy Technology Data Exchange (ETDEWEB)

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

190

Response of zygomaticomaxillary suture to experimental malocclusion in rats.  

UK PubMed Central (United Kingdom)

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

Kasahara T

2000-01-01

191

PROCESS OF INJECTION MOULDING A SYRINGE FROM POLYTHYLENE WAX CONTAINING POLYPROPYLENE, SYRINGE OBTAINED THEREBY AND PARTICULATE COMPOSITION THEREFOR  

UK PubMed Central (United Kingdom)

The invention provides a syringe barrel formed by injection moulding of a polypropylene composition, characterised in that said polypropylene composition contains a polyethylene wax. The invention further provides a syringe having a barrel formed by injection moulding of a polypropylene composition, characterised in that said polypropylene composition contains a polyethylene wax and a polypropylene composition suitable for such moulding.

MATTHIJS Dirk; JAMTVEDT Svein; HÄRKÖNEN Mika; ÏYSAED Harry

192

A preliminary study of oil-polypropylene insulating system  

Energy Technology Data Exchange (ETDEWEB)

In this paper, creeping discharge of oil-polypropylene insulating system have been studied using an experimental model with the flowing oil under ac voltage. The ac creeping discharge inception voltage of the oil-polypropylene system has been tested under varied conditions. According to the experimental results, all of the oil temperature, the oil flow rate and the position of poly-propylene film can influence the ac creeping discharge inception voltage of oil-polypropylene system. The ac inception voltage of this system is increased along with the increase of oil temperature and oil flow rate. Moreover, the ac inception voltage is higher at the position near to oil entrance than that at the position far to oil entrance. Considering the experimental results, a new composite insulating system is put forward for reducing the negative effects of streaming electrification in larger power devices with forced-oil cooling systems.

Chi Xiaochun; Ding Lijian; Yang Jiaxiang [Harbin Inst. of Electrical Technology (China). Dept. of Electrical Materials Engineering

1996-12-31

193

The effects of normal paraffins mobilizers on irradiated polypropylene  

International Nuclear Information System (INIS)

The n-paraffins blended with polypropylene (PP) as mobilizer had been investigated. The effectiveness of mobilizer (n-paraffins) on irradiated polypropylene is dependent on the molecular weight of mobilizer and its content on polypropylene. The n-docosame (n-C22) possesses the best effectiveness of radiation tolerance on PP among the mobilizer paraffins: n-decane (n-C10), n-hexadecane (n-C16), n-docosane (n-C22) and n-hexatriacontane (n-C36). The 2% (w/w) content of a given mobilizer is the most effective at reducing the embrittlement of irradiated PP as evidenced by the elongation at break. The physical properties of polypropylene with mobilizers such as density, Young's modulus, the Fraction of free volume and the weight swelling ratio in p-xylene at room temperature were measured. Above phenomena are related with the constructive of blended PP and demonstrated by its physical properties.

1995-01-01

194

The fire resistance of concrete with polypropylene fibers  

Directory of Open Access Journals (Sweden)

Full Text Available This paper presents the results and conclusions of an experimental study characterization performed on the polypropylene fibers for use in concretes (NPC, Normal Performance Concrete) to produce an improvement in the durability against exposure to high temperatures. It was used only one type of polypropylene fiber with two different lengths, 6?mm and 12?mm, to evaluate the effect of the length.

Corpas F.A.; González B.; Gómez L.; Rosa F.; Figueroa J.M

2013-01-01

195

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

Science.gov (United States)

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

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

2013-05-06

196

Low-Cost B-Lynch Brace Suture Simulator.  

UK PubMed Central (United Kingdom)

The B-Lynch brace suture is invaluable in the surgical management of postpartum hemorrhage, particularly as a fertility-sparing alternative to hysterectomy. In this video, we show how to create a low-cost simulator to teach the B-Lynch brace suture technique, followed by the intraoperative application of the same technique.

Pereira N; Delvadia D

2013-08-01

197

The double-loop technique for meniscal suture.  

UK PubMed Central (United Kingdom)

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

Bender B; Shabat S; Mann G; Oz H; Adar E

2002-10-01

198

The double-loop technique for meniscal suture.  

Science.gov (United States)

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

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

2002-10-01

199

Loop suture technique for optional adjustment in strabismus surgery.  

UK PubMed Central (United Kingdom)

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

Parikh RK; Leffler CT

2013-07-01

200

[Peritoneostomy with latex coated polypropylene: experimental study in rats].  

UK PubMed Central (United Kingdom)

PURPOSE: To evaluate if latex coated polypropylene mesh leads to less adhesions formation. METHODS: 90 rats were distributed in three groups. Group I (control) was submitted to median laparotomy and posterior synthesis; Group II (polypropylene) was submitted to a segment resection of the abdominal wall, and the defect was corrected with a polypropylene mesh; Group III using the new material (latex coated polypropylene). After 45 days the euthanasia procedure was done and the adhesions were evaluated in 2 ways: 1) classification in a grading system; 2) evaluation of the adhesion area, which was calculated by resection of the adhesions after dying with Indian blue ink. RESULTS: The classification in a grading system showed that Group III animals had less adhesions formation (P<0.05), but the evaluation of the adhesion area did not show any difference (P>0.05). The severe complications (fistula, evisceration and obstruction), which were lethal, were not reduced by the latex coated material. CONCLUSION: Latex coated polypropylene causes fewer adhesion formations than polypropylene alone, although it does not diminish the severe early complications.

Claudio RH; Diogo Filho A; Mamede Filho DO

2006-11-01

 
 
 
 
201

Reconsideration of anaerobic fermentation from excess sludge at pH 10.0 as an eco-friendly process.  

UK PubMed Central (United Kingdom)

Volatile fatty acids' (VFA) production from excess sludges during the initial stage (133 h) in the fermentation processes and the disposal risk of sludge were investigated under the real time controlled condition of pH at 5.5 and 10.0. The results showed that the total VFA production at pH 10.0 was markedly higher than that at pH 5.5. Anaerobic fermentation at pH 10.0 was the first be shown having marked reduction effect on total bromate in excess sludge when compared with pH 5.5. Meanwhile, at pH 5.5, sludge dewaterability deteriorated slightly with the fermentation time, whereas at pH 10.0 it deteriorated greatly with the fermentation time. Moreover, the mechanism of VFA improvement was also explored. It was suggested that anaerobic fermentation process at pH 10.0 should be reconsidered to be applied as an eco-friendly material recycling process, based on its sludge dewaterability and total bromate.

Yu GH; He PJ; Shao LM

2010-03-01

202

[Cardiovascular and pupillary effects of topical ophthalmic 2.5 and 10.0% phenylephrine in healthy volunteers].  

UK PubMed Central (United Kingdom)

PURPOSE: To compare the cardiovascular and mydriatic effects of 2.5% and 10.0% phenylephrine. METHODS: A case-control, randomized, crossover clinical trial study. We monitored heart rate (HR), blood pressure (BP) and mydriasis in healthy volunteers aged 18-45 years after the instillation of 2.5% and 10.0% phenylephrine in two different occasions. RESULTS: The sample comprised 28 healthy volunteers, 17 male and 11 female, with a mean age of 26.5 years. No changes in heart rate and systolic blood pressure were observed. No significant variation of the mean diastolic blood pressure was found after 1, 5, 10 and 30- minute instillation of 2.5% phenylephrine. However, with 10.0% phenylephrine, there was an increase in mean diastolic blood pressure after five and ten minutes, followed by a drop after 30 minutes, which was not statistically significant. Mydriasis was more marked in both eyes with a statistically significant difference after instillation of 10.0% phenylephrine. CONCLUSIONS: The mydriatic effect was greater with 10.0% phenylephrine than with 2.5% phenylephrine and the difference was statistically significant. No statistically significant difference was found in relation to cardiovascular effects in both phenylephrine concentrations.

Diniz Filho A; Frasson M; Mérula RV; Morais PR; Cronemberger S

2007-11-01

203

Microsurgical use of polydioxanone (PDS) suture: an experimental report.  

UK PubMed Central (United Kingdom)

Although many technological advances have been made in surgical materials, nylon is still the main suture material use for microvascular surgery. This study sought to evaluate polydioxanone (PDS) sutures for use in microvascular anastomoses. Twenty-eight male Sprague-Dawley rats were used in this experiment. Spatula-type needles with 9-0 PDS suture were used to anastomose the right femoral arteries, with 9-0 nylon used on the left side. The arteries were observed for 1, 2, 3, 4, 8, 12, and 16 weeks after surgery to determine arterial patency and to evaluate vascular pathology. Results were comparable between PDS and nylon. We suggest that if the suture material is redesigned to allow smooth passage through the tissue, and if the needle used in conjunction with the suture is improved, PDS may offer an excellent material for microvascular anastomosis.

Takeishi M; Hirase Y; Kojima T

1992-01-01

204

Effect of Braiding and Hot Stretching Conditions on Sutures Performances  

Directory of Open Access Journals (Sweden)

Full Text Available The success of wound healing depends on suture performances, such as slippage ratio, deformation recovery, knot performance and tensile properties. The main objective of this study is to determine the effect of manufacturing parameters related to braiding and hot stretching steps on suture performances. Obtained results showed that hot stretching contributes to macromolecular chains arrangement as well as suture performances and structural properties improving. The percentage of crystallinity of fabricated suture was ameliorated by hot stretching suture and reaches 25.51% under temperature of 170C and during 3 min. An increase of hot stretching load to 15 N reduces slippage ratio and improves percentage of deformation recovery as a consequence of the improving of macromolecular chains arrangement.

Faten Debbabi; Saber Ben Abdessalem

2011-01-01

205

Mallet finger deformities treated by buried purse-string suture.  

Science.gov (United States)

Objective: To investigate the efficacy of buried purse-string suture in the treatment of mallet finger deformities. Methods: From February 2009 to February 2010, 12 patients with closed non-fracture mallet fingers were treated by buried purse-string suture. The rupture tendons were sutured by purse-string suture with an atraumatic needle, and the knots were buried under subcutaneous tissue. External fixator was used at the extension position of the finger every night within three weeks after operation. Results: All patients were followed up for 6-12 months, mean 7 months. According to the Patel's evaluation criteria, 2 cases (17%) obtained excellent results, 7 good (58%), 2 fair (17%) and 1 poor (8%). The overall rate of the cases with excellent and good outcomes was 75%. Conclusion: Buried purse-string suture is an easy and effective way to treat mallet finger deformities, with no serious postoperative complications or no need for reoperation. PMID:21801669

Yao, Jian-Min; Zhao, Feng-Jing

2011-08-01

206

Mallet finger deformities treated by buried purse-string suture.  

UK PubMed Central (United Kingdom)

Objective: To investigate the efficacy of buried purse-string suture in the treatment of mallet finger deformities. Methods: From February 2009 to February 2010, 12 patients with closed non-fracture mallet fingers were treated by buried purse-string suture. The rupture tendons were sutured by purse-string suture with an atraumatic needle, and the knots were buried under subcutaneous tissue. External fixator was used at the extension position of the finger every night within three weeks after operation. Results: All patients were followed up for 6-12 months, mean 7 months. According to the Patel's evaluation criteria, 2 cases (17%) obtained excellent results, 7 good (58%), 2 fair (17%) and 1 poor (8%). The overall rate of the cases with excellent and good outcomes was 75%. Conclusion: Buried purse-string suture is an easy and effective way to treat mallet finger deformities, with no serious postoperative complications or no need for reoperation.

Yao JM; Zhao FJ

2011-08-01

207

2-hydroxyethyl methacrylate composite - polypropylene mesh for preventing peritoneal adhesions in female dogs/ Compósito 2-hidroxietil dimetacrilato-tela de polipropileno para prevenção de aderências peritoneais em cadelas  

Scientific Electronic Library Online (English)

Full Text Available Abstract in portuguese OBJETIVO: Avaliar se o revestimento da face visceral de uma tela de polipropileno com 2-hidroxietil dimetacrilato (p(HEMA)) poderia evitar aderências peritoniais em cadelas. MÉTODOS: Em oito animais (Grupo PP) foram implantadas telas de polipropileno para correção de um defeito do músculo reto abdominal, enquanto em outro grupo (Grupo PH) fez-se a implantação de uma tela de polipropileno cuja face peritonial foi revestida por 2-hidroxietil dimetacrilato (p(HEMA)). (more) RESULTADOS: Foram observados 62,5% de aderências peritoniais sobre a tela nos animais do Grupo PP, enquanto que no Grupo PH estas não ocorreram, exceto sobre a linha se sutura. CONCLUSÃO: O hidrogel de p(HEMA) foi bem tolerado pelos animais e mostrou-se efetivo na prevenção das aderências viscerais e omentais sobre a tela de polipropileno. Abstract in english PURPOSE: To evaluate whether the lining facing the visceral side of polypropylene mesh made with 2-hydroxyethyl methacrylate (p(HEMA)) hydrogel could avoid peritoneal adhesion in female dogs. METHODS: Eight animals (group PP) had a polypropylene mesh implanted to correct a defect in the rectal abdominal muscle, whereas in the other group (group PH) the polypropylene mesh was coated with p(HEMA) composite on the surface facing the peritoneal area. RESULTS: Adhesions were o (more) bserved on the mesh in 62.5% of the PP group. In the PH group adhesions were present only on the suture lines. CONCLUSION: p(HEMA) hydrogel was well tolerated and effective in avoiding visceral and omental adhesions on the surface of the polypropylene mesh.

Silva, Marcelo Seixo de Brito e; Melo, Renato Miranda de; Menezes, Liliana Borges de; Malmonge, Sonia Maria; Franco, Leandro Guimarães; Paulo, Neusa Margarida

2010-08-01

208

[Mesh fixation with sutures versus fibrin sealant in hernioplasty with re-absorbable prosthesis (polyglycolic acid and trimethylene carbonate). Experimental study in animals].  

UK PubMed Central (United Kingdom)

INTRODUCTION: Current studies have shown the validity of the atraumatic fixation with fibrin glue (Tissucol) compared to conventional sutures in polypropylene mesh fixation. We propose to study the behaviour of absorbable mesh. MATERIAL AND METHODS: We used 20 Wistar white rats. Two hernia defects were made in the abdominal wall, which were repaired using absorbable PGA-TMC preperitoneal mesh. The right side of the mesh was fixed with Tissucol and left side with conventional suture attached to the muscle fascia. One group of 10 rats were sacrificed at day 14 (Series A) and the other 10 rats at 28 days (Series B). We used two tests to assess the contingency of the abdominal wall; Pressure Test: pneumoperitoneum more than 40mmHg maintained for 1min, Traction Test: dynamometry of the affected area more than 300mg per cm(2) of traction. Abdominal wall was analysed to determine the integration of the new generation mesh. RESULTS: The fixation of the mesh after the pressure and traction tests showed no statistically significant changes in either group. The integration of the mesh and vessel neoformation was higher in the cases of fixation with fibrin glue. CONCLUSIONS: Biological fixation with fibrin glue is similar to the conventional. Absorbable mesh was suitably integrated and vascular neoformation and integration of the mesh was also found to be better than conventional sutures when fibrin sealant was applied.

Suárez-Grau JM; Morales-Conde S; Martín-Cartes JA; Chaves CR; Jiménez MB; Ramírez FP; Docobo-Durántez F; Méndez SM

2009-10-01

209

The fluorinated (10, 0) boron nitride nanotube: a computational nuclear magnetic resonance and nuclear quadrupole resonance study.  

UK PubMed Central (United Kingdom)

Quantum chemical calculations at the level of density functional theory (DFT) were carried out to investigate the influence of fluorination boron and nitrogen nuclear magnetic resonance (NMR) and also nuclear quadrupole resonance (NQR) parameters in the (10, 0) single-wall boron nitride nanotube (SWBNNT). To achieve this aim three models of (10, 0) boron nitride nanotubes (BNNTs), raw and two F-attached (exohedral and endohedral) derivatives were studied. The results of calculations showed that while the boron atom chemically bonded to F atom has the largest chemical shielding isotropy (CSI); it has the smallest quadrupole coupling constant (CQ) value among the other boron nuclei.

Seif A; Boshra A; Bodaghi A

2010-01-01

210

Efeitos cardiovasculares e midriáticos da fenilefrina tópica a 2,5 e a 10,0% em voluntários sadios/ Cardiovascular and pupillary effects of topical ophthalmic 2.5 and 10.0% phenylephrine in healthy volunteers  

Scientific Electronic Library Online (English)

Full Text Available Abstract in portuguese OBJETIVO: Comparar os efeitos cardiovasculares e midriáticos da fenilefrina tópica nas concentrações de 2,5 e 10,0%. MÉTODOS: Ensaio clínico do tipo caso controle, randomizado, com auto-emparelhamento. Foram monitoradas a freqüência cardíaca (FC), a pressão arterial (PA) e a midríase em voluntários sadios, com idade entre 18 e 45 anos, após a instilação da fenilefrina a 2,5 e a 10,0% em duas ocasiões diferentes. RESULTADOS: A amostra foi constituída de 28 (more) voluntários, sendo 17 do sexo masculino e 11 do sexo feminino, com a idade média de 26,5 anos. Não foi verificado nenhum padrão de mudanças com relação à freqüência cardíaca e à pressão arterial sistólica. Com relação à pressão arterial diastólica média dos indivíduos, não foi encontrada variação significativa após a instilação da fenilefrina a 2,5% nos tempos de um, cinco, dez e 30 minutos, o que se revelou bem diferente quando do uso da fenilefrina a 10,0%, com a qual houve aumento da pressão arterial diastólica média após cinco e dez minutos, e subseqüente queda após 30 minutos, porém sem significância estatística. A midríase foi maior com a fenilefrina a 10,0% nos dois olhos, sendo a diferença estatisticamente significativa. CONCLUSÕES: Observou-se maior efeito midriático da fenilefrina a 10,0%, quando comparada a 2,5%, com significância estatística. Já com relação aos efeitos cardiovasculares não houve diferença estatística entre as duas concentrações. Abstract in english PURPOSE: To compare the cardiovascular and mydriatic effects of 2.5% and 10.0% phenylephrine. METHODS: A case-control, randomized, crossover clinical trial study. We monitored heart rate (HR), blood pressure (BP) and mydriasis in healthy volunteers aged 18-45 years after the instillation of 2.5% and 10.0% phenylephrine in two different occasions. RESULTS: The sample comprised 28 healthy volunteers, 17 male and 11 female, with a mean age of 26.5 years. No changes in heart (more) rate and systolic blood pressure were observed. No significant variation of the mean diastolic blood pressure was found after 1, 5, 10 and 30- minute instillation of 2.5% phenylephrine. However, with 10.0% phenylephrine, there was an increase in mean diastolic blood pressure after five and ten minutes, followed by a drop after 30 minutes, which was not statistically significant. Mydriasis was more marked in both eyes with a statistically significant difference after instillation of 10.0% phenylephrine. CONCLUSIONS: The mydriatic effect was greater with 10.0% phenylephrine than with 2.5% phenylephrine and the difference was statistically significant. No statistically significant difference was found in relation to cardiovascular effects in both phenylephrine concentrations.

Diniz Filho, Alberto; Frasson, Maria; Mérula, Rafael Vidal; Morais, Patrick Reis; Cronemberger, Sebastião

2007-12-01

211

Internal suture for mallet finger fracture.  

UK PubMed Central (United Kingdom)

An internal suture technique has been used for mallet finger fractures involving at least 30% of the articular surface. It provides fixation without a button or transfixion of the fragment. An independent retrospective review was conducted of ten patients at a mean follow-up of 17 months. Mean visual analogue score (0 to 10) for pain was 2.4 and satisfaction 7.9. Mean active range of motion was 13 to 49 degrees, passive motion was 2 to 56 degrees, pinch strength of effected finger to thumb was 3.8 kgf (81% of the opposite finger), grip strength 37.9 kgf (95% of the opposite hand). All fractures united and there were no neuromas. Complications included two nail deformities, a superficial infection and a pin track infection. One patient with a crush injury continued to have pain despite an arthrodesis.

Bauze A; Bain GI

1999-12-01

212

Internal suture for mallet finger fracture.  

Science.gov (United States)

An internal suture technique has been used for mallet finger fractures involving at least 30% of the articular surface. It provides fixation without a button or transfixion of the fragment. An independent retrospective review was conducted of ten patients at a mean follow-up of 17 months. Mean visual analogue score (0 to 10) for pain was 2.4 and satisfaction 7.9. Mean active range of motion was 13 to 49 degrees, passive motion was 2 to 56 degrees, pinch strength of effected finger to thumb was 3.8 kgf (81% of the opposite finger), grip strength 37.9 kgf (95% of the opposite hand). All fractures united and there were no neuromas. Complications included two nail deformities, a superficial infection and a pin track infection. One patient with a crush injury continued to have pain despite an arthrodesis. PMID:10672805

Bauze, A; Bain, G I

1999-12-01

213

DEVICE FOR CORNEA TRANSPLANTATION WITHOUT SUTURE  

UK PubMed Central (United Kingdom)

The object of this patent belongs to the field of ophthalmology and is a surgical instrument (1 ), whose using allows the execution of punctuate of cornea transplant without the use of suture; consists to a set of arms segments interconnected through a wire, "prolene" (2) of small diameter, which goes through internally structured along the body of each segment, with the first segment of an arc, called the guide (3), is conformed by a bow of 300 degrees with a diameter circular section to be defined and rounded edge, the second segment of an arc, called the main arc (4), is the first proof of the number of rings cooptation, preferably built into a material called PMMA, whose arc can vary from 300 to 400 degrees, with thick set and horizontal sections and oblique tangential to the surface of the cornea and the third segment of an arc, called secondary arc (5),; which has a greater thickness of the primary segment (4).

MONTEIRO CARNEIRO ADRIANO BIONDI

214

Mesenteric suture granuloma caused by retained fragments of suture material in a girl who had a laparotomy 12 years previously.  

UK PubMed Central (United Kingdom)

The authors report a case of a mesenteric suture granuloma in a 12 year-old-girl who had a small bowel resection for a complicated intussusception at the age of 5 months. At later exploration a whitish round tumor located on the anti-mesenteric side of the intestine was found. Several small intestinal loops also abutted on the tumor. Pathologic examination showed fibrosis and a granuloma containing linear colored braided suture material with multinucleated giant cell. As mesenteric suture granulomas have a complex appearance and mimic a soft tissue tumor during imaging, it is important for a surgeon to know about this condition and to consider the history of previous surgery when evaluating the images of patients presenting with an abdominal or pelvic mass. Suture granulomas separate from previous suture sites have not been described in the literature.

Jung E; Park WH; Choi SO

2013-01-01

215

Organoclay Networking in Polypropylene-Clay Nanocomposites  

Science.gov (United States)

We report on networking of organoclays and its influence on the rheology of polypropylene-clay nanocomposites. Samples are blended using either a twin screw extruder (TSE) or a single screw extruder with in situ addition of supercritical CO2 (SCCO2). Blends contain proportional amounts (3:1) of maleic anhydride functionalized PP and organically modified montmorillonite (Cloisite^ 15A, Southern Clay Products) at several clay loadings in a base PP resin (MFI 12 g/10 min at 230 C). Small-amplitude oscillatory shear (SAOS) and steady shear flow were utilized to probe clay morphology with varying annealing time. In SAOS experiments repeated over several hours, the terminal behavior of the TSE samples became increasingly solid-like; in steady shear, the magnitude of the viscosity overshoot increased with annealing time. The single-screw/SCCO2 materials at the same clay loadings differed little rheologically from the neat resin. Finally, network formation kinetics accelerated with increasing temperature, and sufficiently large deformations irreversibly weakened the network structure.

Oberhauser, James; Treece, Mark

2006-03-01

216

Electrical properties of iron irradiated polypropylene films  

International Nuclear Information System (INIS)

The effect of high-energy (50 MeV) Li3+ ion beam irradiation on polypropylene (PP) film has been studied in the f1uence range 2.4 x 1012-1.5 x 1014 ions/cm2. The a.c. electrical properties of PP films were measured in the frequency range from 0.05-100 kHz, and at temperature range between 30 and 140 degC. This study indicates two peaks at 60 degC and 120 degC with comparatively high magnitudes. There is an exponential increase in conductivity with log of frequency and the effect is significant at higher fluences. The loss factor (tan ?) vs frequency plot suggests that PP film based capacitors may be useful below 10 kHz. The capacitance is constant over a wide temperature range up to 130 degC. FTIR spectra of the PP films before and after irradiation indicate that intensity of C-H stretching vibration at 2900 cm-1 is modified. The presence of many new peaks with the increase of fluence suggests the formation of alkanes and alkynes which might be responsible for the observed changes in the dielectric and electrical properties of PP films. (author)

2004-01-01

217

Polypropylene matrix composites reinforced with coconut fibers  

Directory of Open Access Journals (Sweden)

Full Text Available Polypropylene matrix composites reinforced with treated coconut fibers were produced. Fibers chemically treated (alkalization-CCUV samples) or mechanically treated (ultrasonic shockwave-CMUV samples) were dried using UV radiation. The goal was to combine low cost and eco-friendly treatments to improve fiber-matrix adhesion. Composite samples containing up to 20 vol. (%) of untreated and treated coconut fibers were taken from boxes fabricated by injection molding. Water absorption and mechanical properties were investigated according to ASTM D570-98 and ASTM D638-03, respectively. Electrical characterizations were carried out to identify applications of these composites in the electrical sector. NBR 10296-Electrical Tracking Standard (specific to industry applications) and conductivity measurements were obtained applying 5 kV DC to the samples. CMUV samples containing 5 vol. (%) fiber presented superior tensile strength values (?~28 MPa) compared to the untreated fibers composite (?~22 MPa) or alkali treatment (?~24 MPa). However, CMUV composites containing 10 vol. (%) fiber presented best results for the electrical tracking test and electrical resistivity (3 × 10(7) ?.m). The results suggest that composites reinforced with mechanically treated coconut fibers are suitable for electrical applications.

Maria Virginia Gelfuso; Pedro Vieira Gurgel da Silva; Daniel Thomazini

2011-01-01

218

Diffusion in Polypropylene Melts: Role of Stereochemistry.  

Science.gov (United States)

We have performed numerical simulations and experiments at 180^oC to study the effect of stereochemical composition on the diffusion (D) of linear polypropylene melts of moderate polydispersity. The coarse-grained Monte-Carlo (MC) simulations were based on the rotational isomeric state model and repulsive Lennard-Jones potentials. For the pulsed-gradient ^1H NMR diffusion measurements the three specimens used had probabilities of meso diad Pm = 0.02, 0.23, and 0.89. The conversion factor between MC steps and real time was obtained by comparison with the measured D; no dependence on stereochemistry was evident. Using a molecular-weight (M)-scaling known from earlier work on n-alkanes, results were normalized to a common M after accounting for differences in experimental polydispersity. Results agreed closely with the monodisperse simulations. D at high Pm was found to be several times faster than at low Pm, but the simulation also showed a maximum in D at Pm near 0.75, an effect attributed to quenched randomness. Likely for similar reasons the experimental D-distribution for the Pm = 0.89 sample greatly exceeded that expected from the known polydispersity.

von Meerwall, Ernst; Waheed, Numan; Mattice, Wayne

2007-03-01

219

Chemical imaging of wood-polypropylene composites.  

UK PubMed Central (United Kingdom)

Recent investigations of wood plastic composites have revealed a detrimental effect of using lubricant systems in production. This includes nullifying part or all of the mechanical benefit of using a polar compatibilizer, maleic anhydride polypropylene (MAPP), in the composite formulation. This investigation utilizes lubricants labeled with deuterium in conjunction with Fourier transform infrared (FT-IR) spectroscopy to allow for the separation of individual lubricants from all other material constituents. All of the deuterium labeled lubricants, used without MAPP, revealed their expulsion from the wood interface during crystallization. MAPP coupling agent was found to exist near the wood, but it is unclear if any covalent bonding with the hydroxyl functionality on the wood surface occurred. The addition of zinc stearate lubricants appears to nullify the activity of the anhydride functionality near the wood surface as evidenced by a shift in the FT-IR spectra to the hydrolyzed form of the coupling agent. Most of the additives collect at the edges of the spherulites in mostly amorphous regions of the material. The consequence of this morphology may be a weak interface between crystallites.

Harper DP; Wolcott MP

2006-08-01

220

Chemical imaging of wood-polypropylene composites.  

Science.gov (United States)

Recent investigations of wood plastic composites have revealed a detrimental effect of using lubricant systems in production. This includes nullifying part or all of the mechanical benefit of using a polar compatibilizer, maleic anhydride polypropylene (MAPP), in the composite formulation. This investigation utilizes lubricants labeled with deuterium in conjunction with Fourier transform infrared (FT-IR) spectroscopy to allow for the separation of individual lubricants from all other material constituents. All of the deuterium labeled lubricants, used without MAPP, revealed their expulsion from the wood interface during crystallization. MAPP coupling agent was found to exist near the wood, but it is unclear if any covalent bonding with the hydroxyl functionality on the wood surface occurred. The addition of zinc stearate lubricants appears to nullify the activity of the anhydride functionality near the wood surface as evidenced by a shift in the FT-IR spectra to the hydrolyzed form of the coupling agent. Most of the additives collect at the edges of the spherulites in mostly amorphous regions of the material. The consequence of this morphology may be a weak interface between crystallites. PMID:16925926

Harper, David P; Wolcott, Michael P

2006-08-01

 
 
 
 
221

Response of zygomaticomaxillary suture to experimental malocclusion in rats.  

Science.gov (United States)

The purpose of this study was to examine the response of the zygomaticomaxillary suture (ZMS) to experimental malocclusion in rats. Thirty-two male Wistar rats were divided into two groups. Malocclusion was produced in the experimental group (n = 20) by gluing a wire, 1 mm in diameter, on the upper left first molar. Duration of the procedure was 20 min. In the control group (n = 12), rats were forced to open their mouths for the same time as in the experimental group. Histomorphological changes of the ZMS were examined at intervals of 1, 2, 4 and 8 weeks. The specimens were stained with hematoxylin-eosin and Mallory's azan. The suture in the control group showed a regular functional arrangement of component fibers, and osteoblasts lined the periphery of new bone at the inner half of the suture. On the untreated side in the experimental group, osteoclasts were most abundant after 2 weeks. Histomorphometric quantification of the sutural width revealed that, at the inner half of the suture, the width of the sutural space on the treated side in the experimental group was greater than that in the control group after 4 weeks (p ZMS. Moreover, the inner and outer halves of the suture showed different histological changes in response to experimental malocclusion. PMID:10765024

Kasahara, T

2000-01-01

222

Suturing complete radial tears of the lateral meniscus.  

UK PubMed Central (United Kingdom)

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

Yoo JC; Ahn JH; Lee SH; Lee SH; Kim JH

2007-11-01

223

Suturing complete radial tears of the lateral meniscus.  

Science.gov (United States)

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

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

2007-01-05

224

Interlocking circumareolar suture with undyed polyamide thread: a personal experience.  

UK PubMed Central (United Kingdom)

In plastic breast surgery, the interlocking areolar suture has gained wide popularity since its introduction in 2007 by Hammond and colleagues. The interlocking circumareolar suture plays its role in the setting of circumareolar excisions to achieve a durable areola shaping and to prevent scar widening/hypertrophy and areola spreading/distortion. This study retrospectively reviewed 49 breasts that underwent interlocking suture after July 2011 for both aesthetic and reconstructive indications. For the suturing, 3-0 undyed polyamide thread with a straight cutting needle (Dafilon; B. Braun Melsungen AG, Melsungen, Germany) was used. This suture material was preferred to Gore-Tex reported by Hammond and colleagues because it is undyed without any microporous configuration, more wieldy, and less expensive. All 49 breasts showed good results in terms of areola shaping and diameter control as well as good scar quality during a mean follow-up period of 12 months (range 2-18 months) (Fig. 2). No infection, suture extrusion, skin fistula, or granuloma were experienced. The suture was not visible at all, and the patients did not report its palpability. However, at careful examination, the thread resulted slightly palpable. Level of Evidence V This journal requires that authors assign a level of evidence to each article. For a full description of these Evidence-Based Medicine ratings, please refer to the Table of Contents or the online Instructions to Authors www.springer.com/00266 .

Salgarello M; Visconti G; Barone-Adesi L

2013-10-01

225

Interlocking circumareolar suture with undyed polyamide thread: a personal experience.  

Science.gov (United States)

In plastic breast surgery, the interlocking areolar suture has gained wide popularity since its introduction in 2007 by Hammond and colleagues. The interlocking circumareolar suture plays its role in the setting of circumareolar excisions to achieve a durable areola shaping and to prevent scar widening/hypertrophy and areola spreading/distortion. This study retrospectively reviewed 49 breasts that underwent interlocking suture after July 2011 for both aesthetic and reconstructive indications. For the suturing, 3-0 undyed polyamide thread with a straight cutting needle (Dafilon; B. Braun Melsungen AG, Melsungen, Germany) was used. This suture material was preferred to Gore-Tex reported by Hammond and colleagues because it is undyed without any microporous configuration, more wieldy, and less expensive. All 49 breasts showed good results in terms of areola shaping and diameter control as well as good scar quality during a mean follow-up period of 12 months (range 2-18 months) (Fig. 2). No infection, suture extrusion, skin fistula, or granuloma were experienced. The suture was not visible at all, and the patients did not report its palpability. However, at careful examination, the thread resulted slightly palpable. Level of Evidence V This journal requires that authors assign a level of evidence to each article. For a full description of these Evidence-Based Medicine ratings, please refer to the Table of Contents or the online Instructions to Authors www.springer.com/00266 . PMID:23860820

Salgarello, Marzia; Visconti, Giuseppe; Barone-Adesi, Liliana

2013-07-17

226

Comparison of cosmetic outcomes of absorbable versus nonabsorbable sutures in pediatric facial lacerations.  

UK PubMed Central (United Kingdom)

OBJECTIVE: We sought to compare cosmetic outcomes, complication rates, and patient/caregiver satisfaction of absorbable versus nonabsorbable sutures in children. METHODS: Healthy patients, 1 to 18 years old, with facial lacerations 1 to 5 cm, were randomized to repair with fast-absorbing catgut (FAC) or nylon (NYL) sutures. Patients returned in 4 to 7 days and in 3 to 4 months, at which time photographs and caregiver surveys were completed. Unlike part I, all FAC sutures were permitted to absorb rather than be removed. Using a 100-mm visual analog scale (VAS), a noninferiority (NI) design was applied, with a difference of less than 15 mm considered clinically equivalent. Caregivers and 3 blinded physicians independently rated the scars via photographs. RESULTS: Ninety-eight patients were enrolled, 76 caregiver surveys were completed, and 61 (29 FAC, 32 NYL) had photographs scored by physicians. The mean physician VAS scores for FAC and NYL were 57.6 and 67.6, respectively (difference, -10.0; 95% confidence interval, -19.1 to -0.4); thus, NI could not be established. The mean caregiver VAS scores for the FAC and NYL groups were 93.8 and 86.6, respectively (difference, 7.2; 95% confidence interval, -4.9 to 13.9); thus, NI of FAC was established. There were no significant differences in rates of infection, wound dehiscence, or keloid formation. In terms of future preference, caregivers favored FAC (33/33) over NYL (26/36) (P < 0.01). CONCLUSIONS: Caregiver VAS scores showed NI of FAC, which were also preferred by the caregivers. However, NI for FAC could not be demonstrated by blinded physicians with respect to cosmetic outcomes.

Luck R; Tredway T; Gerard J; Eyal D; Krug L; Flood R

2013-06-01

227

Water Absorption Properties and Morphology of Polypropylene/ Polycarbonate/Polypropylene-graft-Maleic Anhydride Blends  

Directory of Open Access Journals (Sweden)

Full Text Available This study investigates the effect of blending polycarbonate (PC) into polypropylene (PP) matrix polymer on water absorption properties and morphology. The blends, containing 5-35% of polycarbonate and 5% compatibilizer, were compounded using twin - screw extruder and fabricated into standard tests samples using compression molding. The compatibilizer used was polypropylene-graft-maleic anhydride (PP-g-MA). In water absorption test, specimens were immersed in distilled water at 23 and 100°C. In 23°C immersion, PC showed the highest absorption at 0.362 wt.% while PP was the lowest at 0.064 wt.%. The blends demonstrated transitional absorption value between PP and PC. In 100°C immersion, 90/5/5, 80/15/5 and 70/25/5 compositions (PP/PC/PP-g-MA) exhibited lower absorption than PP, indicating enhanced long-term degradation resistance in water compared to PP. Microscopy analysis showed that PC existed as fibers, dispersed throughout PP matrix.

M.S. Mat-Shayuti; M.Z. Abdullah; P.S.M. Megat-Yusoff

2013-01-01

228

Post irradiation degradation of polypropylene radiation durability of polypropylene stabilized with phenolic stabilizer (II)  

International Nuclear Information System (INIS)

[en] Post irradiation degradation of 60Co gamma irradiated polypropylene stabilized with a phenolic type stabilizer has been followed up to two years after being irradiated. The effectiveness of the stabilizer at various concentrations on the polypropylene samples irradiated up to 150 kGy has been studied and the buildup of carbonyl group in the irradiated samples measured. The obtained results indicated that the oxidative reactions are retarded by addition of stabilizer. The variation of bend strength of the irradiated samples with and without stabilizer was also followed. This property was found to be greatly improved for the stabilized samples irradiated at low doses. However at high doses the effectiveness of the stabilizer declined. In order to correlate these results with the change in the molecular weight of polymer, trends of the change in rheological behaviour such as melt viscosity (?a) and flow behavior parameters (K, n) of both stabilized and unstabilized samples have been investigated. Results showed that at low doses, addition of the stabilizer greatly reduces the extent of chain scission, and therefore, the mechanical properties of the irradiated polymer are retained. (Author)

1994-01-01

229

Post irradiation degradation of polypropylene radiation durability of polypropylene stabilized with phenolic stabilizer (II)  

Energy Technology Data Exchange (ETDEWEB)

Post irradiation degradation of {sup 60}Co gamma irradiated polypropylene stabilized with a phenolic type stabilizer has been followed up to two years after being irradiated. The effectiveness of the stabilizer at various concentrations on the polypropylene samples irradiated up to 150 kGy has been studied and the buildup of carbonyl group in the irradiated samples measured. The obtained results indicated that the oxidative reactions are retarded by addition of stabilizer. The variation of bend strength of the irradiated samples with and without stabilizer was also followed. This property was found to be greatly improved for the stabilized samples irradiated at low doses. However at high doses the effectiveness of the stabilizer declined. In order to correlate these results with the change in the molecular weight of polymer, trends of the change in rheological behaviour such as melt viscosity ({mu}{sub a}) and flow behavior parameters (K, n) of both stabilized and unstabilized samples have been investigated. Results showed that at low doses, addition of the stabilizer greatly reduces the extent of chain scission, and therefore, the mechanical properties of the irradiated polymer are retained. (Author).

Yousefi, A. [Atomic Energy Organization of Iran, Tehran (Iran, Islamic Republic of). Gamma Irradiation Center; Katbab, A.A. [Amir Kabir Technical Univ., Teheran (Iran, Islamic Republic of). Dept. of Physics

1994-12-01

230

Suture-related corneal infections after clear corneal cataract surgery.  

UK PubMed Central (United Kingdom)

Three patients at our institution developed corneal infections associated with sutures placed after clear corneal incision cataract surgery. The time to infection was 9 weeks, 22 months, and 33 months. One patient required injection of intravitreal antibiotic agents for presumed endophthalmitis associated with the corneal infection. Two patients were treated with topical fortified antibiotic eyedrops only. Although there was no significant change in visual acuity after resolution of the infection, morbidity from suture-related corneal infections can be significant. Routine suture removal in the early postoperative period may be warranted to prevent such infections.

Lee BJ; Smith SD; Jeng BH

2009-05-01

231

A modified suture technique for fixation of the Akin osteotomy.  

UK PubMed Central (United Kingdom)

The Akin osteotomy is a frequently performed medial closing wedge osteotomy of the proximal phalanx of the hallux. It is usually used as a complimentary procedure in the correction of hallux valgus. Various implants and techniques have been described for fixation. Suture fixation has the advantage of a lower implant signature and a reduction in cost. However, the thin cortex of the phalanx can be prone to failure during suture application. We describe a new technique for suture fixation, which we have found to be reliable and to reduce the risk of phalangeal cortical failure.

Roy SP; Tan KJ

2013-03-01

232

A modified suture technique for fixation of the Akin osteotomy.  

Science.gov (United States)

The Akin osteotomy is a frequently performed medial closing wedge osteotomy of the proximal phalanx of the hallux. It is usually used as a complimentary procedure in the correction of hallux valgus. Various implants and techniques have been described for fixation. Suture fixation has the advantage of a lower implant signature and a reduction in cost. However, the thin cortex of the phalanx can be prone to failure during suture application. We describe a new technique for suture fixation, which we have found to be reliable and to reduce the risk of phalangeal cortical failure. PMID:23318100

Roy, Shuvendu Prosad; Tan, Ken Jin

2013-01-11

233

Production of high melt strength polypropylene by gamma irradiation  

Energy Technology Data Exchange (ETDEWEB)

High melt strength polypropylene (HMS-PP) has been recently developed and introduced in the market by the major international producers of polypropylene. Therefore, BRASKEM, the leading Brazilian PP producer, together with EMBRARAD, the leading Brazilian gamma irradiator, and the IPEN (Institute of Nuclear Energy and Research) worked to develop a national technology for the production of HMS-PP. One of the effective approaches to improve melt strength and extensibility is to add chain branches onto polypropylene backbone using gamma radiation. Branching and grafting result from the radical combinations during irradiation process. Crosslinking and main chain scission in the polymer structure are also obtained during this process. In this work, gamma irradiation technique was used to induce chemical changes in commercial polypropylene with two different monomers, Tri-allyl-isocyanurate (TAIC) and Tri-methylolpropane-trimethacrylate (TMPTMA), with concentration ranging from 1.5 to 5.0 mmol/100 g of polypropylene. These samples were irradiated with a {sup 60}Co source at dose of 20 kGy. It used two different methods of HMS-PP processing. The crosslinking of modified polymers was studied by measuring gel content melt flow rate and rheological properties like melt strength and drawability. It was observed that the reaction method and the monomer type have influenced the properties. However, the concentration variation of monomer has no effect.

Lugao, A.B. [IPEN-Av. Professor Lineu Prestes 2242, 05508-000 Sao Paulo (Brazil)], E-mail: ablugao@ipen.br; Artel, B.W.H. [EMBRARAD-Av. Cruzada Bandeirante 269, 06700-000 Sao Paulo (Brazil); Yoshiga, A.; Lima, L.F.C.P.; Parra, D.F.; Bueno, J.R. [IPEN-Av. Professor Lineu Prestes 2242, 05508-000 Sao Paulo (Brazil); Liberman, S.; Farrah, M.; Tercariol, W.R. [BRASKEM-Av. Nacoes Unidas 4777, 05477000 Sao Paulo (Brazil); Otaguro, H. [IPEN-Av. Professor Lineu Prestes 2242, 05508-000 Sao Paulo (Brazil)

2007-11-15

234

Production of high melt strength polypropylene by gamma irradiation  

International Nuclear Information System (INIS)

High melt strength polypropylene (HMS-PP) has been recently developed and introduced in the market by the major international producers of polypropylene. Therefore, BRASKEM, the leading Brazilian PP producer, together with EMBRARAD, the leading Brazilian gamma irradiator, and the IPEN (Institute of Nuclear Energy and Research) worked to develop a national technology for the production of HMS-PP. One of the effective approaches to improve melt strength and extensibility is to add chain branches onto polypropylene backbone using gamma radiation. Branching and grafting result from the radical combinations during irradiation process. Crosslinking and main chain scission in the polymer structure are also obtained during this process. In this work, gamma irradiation technique was used to induce chemical changes in commercial polypropylene with two different monomers, Tri-allyl-isocyanurate (TAIC) and Tri-methylolpropane-trimethacrylate (TMPTMA), with concentration ranging from 1.5 to 5.0 mmol/100 g of polypropylene. These samples were irradiated with a 60Co source at dose of 20 kGy. It used two different methods of HMS-PP processing. The crosslinking of modified polymers was studied by measuring gel content melt flow rate and rheological properties like melt strength and drawability. It was observed that the reaction method and the monomer type have influenced the properties. However, the concentration variation of monomer has no effect.

2007-01-01

235

Comparison of life cycle assessment for different volume polypropylene jars  

Directory of Open Access Journals (Sweden)

Full Text Available When deciding what packaging is the most appropriate for a product there are many factors to be considered. One of them is the impact of the packaging on environment. In this work, life cycle inventory and life cycle assessment of two different volume packagings were compared. The data were collected on the types and amounts of materials and energy consumption in the process of packaging and distribution of hand cream packed in polypropylene jars of 200 and 350 mL. Life cycle inventory (LCI) and life cycle impact assessment (LCA) were calculated. It was found that the total mass flow was higher for the jars of 350 mL. After analyzing individual flows, it was found that in both cycles (polypropylene jars of 200 and 350 mL),the consumption of fresh water was a dominant flow. This fresh water flow is mostly (95%) consumed in the injection molding process of manufacturing jars from polypropylene granules. The LCA analysis showed no significant difference in global warming potential between different volume jars. The process that mostly affected global warming was the production of polypropylene jars from polypropylene granules by injection molding for both jar volumes. Judging by the global warming potential, there is no difference of the environmental impact between investigated jars, but considering the mass flow and water consumption, more environmental friendly were the 200 mL jars.

Krki? Nevena M.; Lazi? Vera L.; Šuput Danijela Z.

2012-01-01

236

Physical and Mechanical Properties of Natural Fibers Filled Polypropylene Composites and Its Recycle  

Digital Repository Infrastructure Vision for European Research (DRIVER)

This study discusses the influence of natural fiber type on the performance of polypropylene and its recycle. Composites consisting of polypropylene (PP) and natural fiber from wood (Acacia mangium), water hyacinth (Eichornia crassipes), kenaf (Hibiscus cannabinus), banana (M...

Myrtha Karina; Holia Onggo; Anung Syampurwadi

237

Can bipolar electrosurgery be performed over suture sites without compromising tensile strength of suture material during laparoscopic myomectomy?  

UK PubMed Central (United Kingdom)

STUDY OBJECTIVE: To estimate whether additional bleeding control can be safely achieved during laparoscopic myomectomy using bipolar electrosurgery over the suture sites in patients with blood oozing despite sufficient myometrial sutures. DESIGN: Retrospective case control study (Canadian Task Force classification II-1). SETTING: University teaching hospital. PATIENTS: One hundred twenty-six women who underwent laparoscopic myomectomy performed by one surgeon. INTERVENTIONS: Changes in maximum tensile strength of various suture materials were measured at tensinometry after bipolar electrosurgery or diathermy. Bipolar electrosurgery was performed over suture sites during laparoscopic myomectomy after adequate suturing (bipolar group, n = 64). Clinical outcomes were compared with those in matched controls (control group, n = 62]. MEASUREMENTS AND MAIN RESULTS: Polyglactin 910 (Vicryl) and glycolide-lactide copolymer (Polysorb) sutures exhibited no substantial changes in maximum tensile strength after 2 seconds of bipolar electrosurgery. However, both sutures demonstrated a decrease in maximum tensile strength of 43.5% and 17.4%, respectively, after 4 seconds of bipolar electrosurgery at 40 W. Compared with the control group, in the bipolar group mean (SD) postoperative hemoglobin concentration was higher (11.1 [1.3] g/dL vs 10.5 [1.3] g/dL), total drainage volume was less (244.6 [133.7] mL vs 380.2 [196.0] mL), a drain was required for a shorter time (2.0 [0.7] days vs 2.8 [0.7] days), and hospital stay was shorter (4.3 [1.6] days vs 5.3 [1.7] days) (p <.05). CONCLUSIONS: During laparoscopic myomectomy, additional bleeding control can be achieved by using careful short duration bipolar electrosurgery over the suture site. However, application of excessive bipolar electrosurgery (>40 W and ? 4 seconds) tends to weaken suture material.

Sol ES; Hong SY; Oh HK; Kim AS; Sin JI; Choi YS

2011-03-01

238

Cierre de la pared abdominal: qué técnica y qué sutura se deben usar Closing the abdominal wall: what technique and type of suture to use  

Directory of Open Access Journals (Sweden)

Full Text Available Introducción: El cierre de la pared abdominal es un procedimiento frecuente en la práctica de los cirujanos generales. El tipo de cierre y el material de sutura en la mayoría de los casos se realizan y escogen en forma empírica. El presente estudio valora la mejor evidencia disponible sobre la técnica para el cierre de la fascia abdominal y el tipo de sutura. Métodos: Se realizó una búsqueda sistemática de la literatura y se evaluaron los artículos de más alta calidad (revisiones sistemáticas). Los resultados se analizaron particularmente. Resultados: La mejor técnica de sutura de la fascia abdominal es aquella con puntos continuos con material de absorción lenta (polidioxanona) o no absorbible (polipropileno), los cuales tienen índices de hernia incisional menores que las suturas de absorción rápida. Conclusiones: Es recomendable utilizar sutura de material de absorción lenta o no absorbible para el cierre de la pared abdominal.Introduction: Closure of the abdominal wall is a frequently performed procedure in general surgical practice. The type of closure and the suture material are often chosen on empirical bases. The present study evaluates the best evidence available regarding the technique of closure of the abdominal wall and the best suture material to be used. Methods: A systematic literature search was undertaken and the best quality articles (systematic reviews) were analyzed. Results: The best technique appears to be the closure with interrupted sutures of slow absorption (polydioxanone) or non absorbable (polypropylene) material, which exhibit lower recurrence rates that those observed with materials of rapid absorption. Conclusions: It is recommended to utilize interrupted sutures of slow absorption or non absorbable material for closing the abdominal wall.

Carlos Lehmann; Álvaro Sanabria; Eduardo Valdivieso; Gabriel Gómez

2007-01-01

239

The structural and electronic properties of (10,0) zigzag Single-Wall Carbon Nanotubes modified by thiophene groups  

Science.gov (United States)

In this letter, modifications of (10,0) functionalized zigzag Single-Wall Carbon Nanotubes in different sites by thiophene groups were studied using density functional theory. Geometric structures and electronic properties were investigated. After modification a significant change was observed in band structure and density of states and metallic properties were obtained. The best result for application in organic photovoltaic cells was achieved when two organic groups were placed on opposite sides of the wall of the SWCNT symmetrically.

Hamadanian, Masood; Tavangar, Zahra; Naseh, Sara

2013-10-01

240

The shape memory effect in 50.3Mn-39.7Ni-10.0Al alloy  

Energy Technology Data Exchange (ETDEWEB)

The shape memory effect has been observed in 50.3Mn-39.7Ni-10.0Al alloy by thermal cycling under a load and bending at room temperature. A particular apparatus for bending tests is described. The second phase particles improve ductility of the intermetallic but result in incomplete shape recovery. Deformation of a dual phase material consisting the hard intermetallic matrix and the particles of the soft disordered phase is discussed. (orig.).

Potapov, P.L. [Institute of Phys. Metall., Moscow (Russian Federation); Udovenko, V.A. [Institute of Phys. Metall., Moscow (Russian Federation)

1995-12-01

 
 
 
 
241

The shape memory effect in 50.3Mn-39.7Ni-10.0Al alloy  

International Nuclear Information System (INIS)

[en] The shape memory effect has been observed in 50.3Mn-39.7Ni-10.0Al alloy by thermal cycling under a load and bending at room temperature. A particular apparatus for bending tests is described. The second phase particles improve ductility of the intermetallic but result in incomplete shape recovery. Deformation of a dual phase material consisting the hard intermetallic matrix and the particles of the soft disordered phase is discussed. (orig.)

1995-01-01

242

The Effect of Anchoring Sutures on Medicinal Leech Mortality  

Science.gov (United States)

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

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

2009-01-01

243

Absorption and Tensility of Bioactive Sutures Prepared for Cell Transplantation  

Directory of Open Access Journals (Sweden)

Full Text Available Biodegradable scaffolds are widely used to transplant stem cells into various tissues. Recent studies showed that living stem cells can be attached to the surface of absorbable sutures in vitro. Soaking the absorbable material polyglactin in a cell culture medium and thereby creating a stem cell biofilm on its surface may initiate the absorption process even before implantation; therefore, the physicochemical properties of the suture may be compromised in vivo. We found that pre-incubation of sutures in cell culture media in vitro results in tensile strength reduction and faster suture absorption in a rat model of muscle injury. Shorter incubation times of up to 48 h do not influence absorption or tensility; therefore, it is advisable to limit incubation times to two days for polyglactin-based cell delivery protocols.

Dénes B. Horváthy; Gabriella Vácz; Tamás Szabó; Károly Renner; Kinga Vajda; Balázs Sándor; Zsombor Lacza

2013-01-01

244

Structural grafts and suture techniques in functional and aesthetic rhinoplasty  

Digital Repository Infrastructure Vision for European Research (DRIVER)

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 freque...

Gassner, HG

245

[Construction and validation of a three-dimensional finite element model of cranio-maxillary complex with sutures in unilateral cleft lip and palate patient].  

UK PubMed Central (United Kingdom)

PURPOSE: To explore an effective method to construct and validate a finite element model of the unilateral cleft lip and palate(UCLP) craniomaxillary complex with sutures, which could be applied in further three-dimensional finite element analysis (FEA). METHODS: One male patient aged 9 with left complete lip and palate cleft was selected and CT scan was taken at 0.75mm intervals on the skull. The CT data was saved in Dicom format, which was, afterwards, imported into Software Mimics 10.0 to generate a three-dimensional anatomic model. Then Software Geomagic Studio 12.0 was used to match, smoothen and transfer the anatomic model into a CAD model with NURBS patches. Then, 12 circum-maxillary sutures were integrated into the CAD model by Solidworks (2011 version). Finally meshing by E-feature Biomedical Modeler was done and a three-dimensional finite element model with sutures was obtained. A maxillary protraction force (500 g per side, 20° downward and forward from the occlusal plane) was applied. Displacement and stress distribution of some important craniofacial structures were measured and compared with the results of related researches in the literature. RESULTS: A three-dimensional finite element model of UCLP craniomaxillary complex with 12 sutures was established from the CT scan data. This simulation model consisted of 206 753 individual elements with 260 662 nodes, which was a more precise simulation and a better representation of human craniomaxillary complex than the formerly available FEA models. By comparison, this model was proved to be valid. CONCLUSIONS: It is an effective way to establish the three-dimensional finite element model of UCLP cranio-maxillary complex with sutures from CT images with the help of the following softwares: Mimics 10.0, Geomagic Studio 12.0, Solidworks and E-feature Biomedical Modeler.

Wu ZF; Lei YH; Li WJ; Liao SH; Zhao ZJ

2013-02-01

246

[Extract of Passiflora edulis in the healing process of gastric sutures in rats: a morphological and tensiometric study].  

UK PubMed Central (United Kingdom)

INTRODUCTION: Many substances of vegetable origin have been used since the beginning of civilization with the purpose of improving the healing process. Among them, dry leaves extract from Passiflora edulis have been shown to have an anti-inflammatory effect in rats. PURPOSE: To analyze the effect of dry leaves extract from Passiflora edulis in the healing of gastric sutures in rats. METHODS: Forty male adult Wistar rats were divided into two groups of 20 rats, called Passiflora group (GP) and Control group (GC) which were divided into two groups of 10 according to moment of death, on day 3 or day 7 after the operation. All animals were submitted to a midline incision and a gastrotomy was performed on the anterior wall of the stomach followed by gastric suture with polypropylene 6.0 using four stitches on a single layer. Rats from GP were given, before closure of the abdominal wall, a solution of Passiflora edulis extract, 250 mg/kg/weight, while rats from the GC were given an isovolumetric isotonic saline solution. Macroscopic evaluation included the adhesion index proposed by Knightly. Bursting pressure was measure by an electronic device. Microscopic analysis was performed including inflammation parameters. RESULTS: All animals presented adequate healing of the abdominal wall with no clinical signs of infections or dehiscence. The adherence index was similar in both groups both on day 3 (p=0.734) and on day 7 (p=1.000). The gastric sutures presented leak with smaller insufflation pressure on the 3rd P.O. day in both groups as compared to the 3rd P.O. day. There was no significant difference of bursting pressure among the subgroups on the 3rd P.O. day (GC3=41.1 +/- 22.1 mmHg versus GP3=59.2 +/- 20.4 mmHg; p=0.074). On the 7th P.O. day, there was an increased mean bursting pressure in both groups, but there was no statistically significant difference between the two groups (p=0.850). Histologic parameters were similar in both groups, on P.O. days 3 and day 7, except for the fibroblastic proliferation, which was greater on the 7th day in GP (p=0.002). CONCLUSION: The intraperitoneal use of Passiflora edulis extract influences favorably the healing of gastric sutures in rats because of the increase in the fibroblastic proliferation on the 7th P.O. day.

Silva JR; Campos AC; Ferreira LM; Aranha Júnior AA; Thiede A; Zago Filho LA; Bertoli LC; Ferreira M; Trubian PS; Freitas AC

2006-01-01

247

Study of rheological properties of polypropylene/organoclay hybrid materials.  

UK PubMed Central (United Kingdom)

Polypropylene nanocomposites reinforced with organic modified montmorillonite clay have been fabricated by melt compounding using extrusion. The morphology of the composites is studied with transmission electron microscopy and X-ray diffraction. The melt-state rheological properties of the nanocomposites have been investigated as a function of temperature and organoclay loading. It is found that the organoclays are intercalated and dispersed evenly in the matrix. The storage and loss moduli of the hybrid composites decrease with temperature and increase with organoclay concentration. Both polypropylene and its composites demonstrate a melt-like rheological behavior, indicating the low degree of exfoliation of the organoclay. A shear thinning behavior is found for both polypropylene and its composites, but the onset of shear thinning for organoclay composites occurs at lower shear rates.

Yu S; Liu S; Zhao J; Yong MS

2006-12-01

248

Morphology and mechanical properties of polypropylene-wood flour composites  

Directory of Open Access Journals (Sweden)

Full Text Available The microstructure and mechanical properties of polymer composites based on polypropylene and wood flour modified with monochloroacetic acid were investigated. Scanning electron microscopy and wide-angle X-ray diffraction were used as methods to probe the composite microstructures, while the tensile test was used to measure the physical strength. The wood flour modification was performed at different levels of monochloroacetic acid, ranging from 0.01 to 1 mol, while the modified wood flour was used as filler for polypropylene at 10, 20 and 30 wt.-%. It was found that increasing the monochloroacetic acid fraction influences the microstructure of the composites and leads to more homogeneous products. The introduction of non-modified wood flour decreases the polypropylene crystallization degree, but it improves after introduction of monochloroacetic acid. Physical-mechanical tests showed positive effects on tensile tests and Charpy notched impact strength. The new composites appear to be promising materials for construction purposes.

Dobreva, D.; Nenkova, S.; Vasileva, St.

2006-01-01

249

[Biomechanical research of different polypropylene meshes in breast ptosis correction].  

UK PubMed Central (United Kingdom)

OBJECTIVE: To investigate the biomechanical properties of different polypropylene meshes, so as to select the proper mesh for breast ptosis correction as inner bra. METHODS: Mini-pigs were used as animal model. Four different polypropylene meshes were implanted subcutaneously at abdomen. 90 d later, the specimens were taken out for biomechanical study. RESULTS: The tensile strength, stress, relaxation and creep of the four meshes were different. The material and the knitting of the four meshes were different. CONCLUSIONS: The biomechanical properties of relaxation and creep are important in maintaining the postoperative breast figure. Premilene Mesh LP is a new and light polypropylene mesh with mini-pores. Its biomechanical properties are superior to the others.

Wang Z; Zeng YJ; Zhang HL; Sun BD; Qiao Q

2009-11-01

250

CCMR: Electrospinning of Polypropylene Nanocomposite Nanofibers from Solution  

Science.gov (United States)

Polypropylene and polypropylene/Closite 30B nanocomposite nanofibers were successfully electrospun from a decalin solution at elevated temperatures. Two methods of producing nanocomposite nanofibers were compared. The first method was by compounding the nanoclays into the polypropylene in a twin-screw microextruder, and the second was by direct blending of the nanoclays into the solution. The fibers were then characterized by SEM, XRD, and DSC. Electrospinning resulted in nonwoven mats of fibers with diameters ranging from 100 microns to 2 microns. The all fibers were found to contain beta-phase crystals that were unstable at elevated temperatures, while the resins contained only alpha phase at room temperature but developed beta phase at higher temperatures. The fraction of PP in the beta crystal phase depended on method of nanoclay inclusion.

Barron, Kathleen

2004-08-17

251

Local tissue ischemia is not necessary for suture-induced adhesion formation.  

UK PubMed Central (United Kingdom)

BACKGROUND: We investigated the hypothesis that local tissue ischemia is responsible for suture-induced adhesion formation. METHODS: A total of 160 interrupted sutures were placed in the parietal peritoneum of 20 Wistar rats. The animals were randomized into an ischemia group, where the sutures were pulled tight and a non-ischemia group, where the sutures were tied as loose loops with air knots to avoid any local ischemia. The midline laparotomy was closed with a running suture. On postoperative day 10, adhesions to the sutures were counted. RESULTS: There was no statistically significant difference in the number of adhesions forming to sutures with local ischemia (n?=?66/80) versus sutures without local ischemia (n?=?69/80). CONCLUSION: We conclude that local tissue ischemia is not necessary for suture-induced adhesion formation and propose an additional mechanical mechanism to explain how suture knots can predispose to adhesiogenesis.

Rajab TK; Brochhausen C; Wallwiener M

2013-05-01

252

Local tissue ischemia is not necessary for suture-induced adhesion formation.  

UK PubMed Central (United Kingdom)

BACKGROUND: We investigated the hypothesis that local tissue ischemia is responsible for suture-induced adhesion formation. METHODS: A total of 160 interrupted sutures were placed in the parietal peritoneum of 20 Wistar rats. The animals were randomized into an ischemia group, where the sutures were pulled tight and a non-ischemia group, where the sutures were tied as loose loops with air knots to avoid any local ischemia. The midline laparotomy was closed with a running suture. On postoperative day 10, adhesions to the sutures were counted. RESULTS: There was no statistically significant difference in the number of adhesions forming to sutures with local ischemia (n?=?66/80) versus sutures without local ischemia (n?=?69/80). CONCLUSION: We conclude that local tissue ischemia is not necessary for suture-induced adhesion formation and propose an additional mechanical mechanism to explain how suture knots can predispose to adhesiogenesis.

Rajab TK; Brochhausen C; Wallwiener M

2013-10-01

253

Double-armed suture package having ramped needle park  

UK PubMed Central (United Kingdom)

A folder package for surgical sutures. The package has a base panel, a foldably connected cover panel, a foldably connected closure panel, a foldably connected end panel, and a ramp structure. The package also has at least one ramp structure mounted to the base panel. The ramp structure allows sutures to pass over the park without getting hung-up on or in the park.

CERWIN ROBERT JAMES; TRANSUE DEBORAH M; ALPERN MARVIN

254

SUTURE NON-SUTSRE CIRCUMFERENTIAL REPAIR OF CAROTID ARTERY  

Directory of Open Access Journals (Sweden)

Full Text Available plastic adhesives, normal butyl cyanoacrylate monomer, isobutyl cyanoacrylate monomer and methyl 2 _ cyaooacrylate monomer, have been utilized in a comparative study with 5-{) silk suture in the repair of transected carotid arteries. Follow _ up arteriog ramS indicate isobutyl cyanoacrylate monomer and normal butyl cyanoacrylate monomer as having the most impressive rerults with only tWO thrombosis each. The silk suture had three thromboses and the adhesive methyl 2 _ cyanoacrylate monomer had nine, one of which a delayed

Jafar Nader

1969-01-01

255

Utilização do laser de argônio na remoção de sutura corneana Use of argon laser in corneal suture removal  

Directory of Open Access Journals (Sweden)

Full Text Available OBJETIVO: Descrever a técnica da retirada de sutura em córnea clara, evitando-se o contato da parte externa do fio com o meio intra-ocular e avaliar se esse procedimento evitaria infecções. MÉTODOS: Foi realizado estudo retrospectivo de 1.233 casos de retirada de sutura de mononylon 10.0 em córnea clara, utilizando-se laser de argônio para cortar o fio, no qual se avaliou a incidência de infecções. RESULTADOS: Em 1.071 olhos, um tiro foi suficiente para cortar o ponto. Em 162 olhos, o tiro do laser atingiu a parte epitelial da sutura, sendo necessários disparos extras para cortar a parte intra-estromal e, assim, retirá-la sem que a parte externa do fio passasse pelo interior da córnea. Não ocorreram complicações após a retirada da sutura. CONCLUSÕES: A técnica utilizada mostrou-se eficaz na remoção das suturas e possivelmente apresenta risco menor de infecção, uma vez que a parte do fio sobrejacente ao epitélio não entra em contato com as camadas mais internas da córnea, nem com a câmara anterior, não tendo sido observado nenhum caso de infecção nesta pesquisa.PURPOSE: To describe the technique of clear-cornea suture removal, that avoids the contact of the external part of the thread with the intraocular medium, and to evaluate whether this procedure would prevent infections. METHODS: A retrospective study of 1.233 cases of clear-cornea mononylon 10.0 suture removal, by the use of an argon laser to cut the thread, was performed. Incidence of infection was then assessed. RESULTS: In 1.071 eyes, one shot was enough to cut the stitch. In 162 eyes, the laser shot hit the epithelial part of the suture, making new shots necessary to cut the intrastromal part, and thus to remove it assuring that the outer part of the stitch would not come in to contact with the interior of the cornea. There were no complications after suture removal. CONCLUSIONS: The technique has shown to be effective in suture removal. And, possibly, presents a lower risk for infection, since the external part of the thread does not come in to contact with the innermost parts of the cornea, or with the anterior chamber. No cases of infection have been observed during this research.

Edélcio Vieira; Vinícius dos Santos Watzl Costa Lima; Mírian da Silva Azevedo; Wantuil Ferreira de Souza Júnior; Roberto Reis Xavier dos Santos; Ruiz Simonato Alonso

2004-01-01

256

Effects of two suture techniques in conjunctival autograft surgery  

Directory of Open Access Journals (Sweden)

Full Text Available AIM: To compare the effects of continuous side whipstitch suture and interrupted suture in conjunctival autograft surgery after resection of primary pterygium.METHODS: A comparative, prospective and randomized clinical trial was performed in 48 eyes of 48 patients with primary pterygium. All patients were randomly divided into two groups with 24 eyes of 24 patients in each group. In group A and B, continuous side whipstitch suture and interrupted suture were respectively adopted. The time spent in suture was recorded during surgery. The postoperative ocular discomfort and the time spent in taking out stitches were recorded during the 6-month follow-up. RESULTS: The average surgical time was 14.05±2.30 minutes for group A and 19.34±2.12 minutes for group B(Prd (1.32±0.60 vs 1.68±0.35, Pth(0.87±0.24 vs 1.26±0.68, PPCONCLUSION: In the surgical management of primary pterygium, continuous side whipstitch suture can improve the surgical efficiency and decrease the ocular discomfort in the postoperative period. It proves to be an excellent option for conjunctival autograft attachment in primary pterygium surgery.

Chao-Peng Li; Su-Yan Li; Lei Jin

2013-01-01

257

Effect of Suture Lines on Lung Adenocarcinoma Cell in vitro  

Directory of Open Access Journals (Sweden)

Full Text Available Background and objective The interaction of cell and medical biomaterial is one of the significant factors to affect clinical application of medical biomaterial. This research is to investigate three of suture lines how to affect the proliferation and cell cycle of Lung Adenocarcinoma cell A549. Methods Three of suture lines are respectively cultivated with Lung Adenocarcinoma cell A549, after of 72 hours, to detect absorptance of each groups by MTT method in order to reflect the proliferation of Lung Adenocarcinoma cell A549 and to detect percentage of G1 period cell and S period cell of each of groups by flow cytometry. Results Different of suture lines have effect differently on the proliferation and cell cycle of Lung Adenocarcinoma cell A549 (P < 0.05). The effect of absorbent suture line on the proliferation and cell cycle of Lung Adenocarcinoma cell A549 is strong, the effect of chorda serica chirurgicalis is medium, the effect of slide wire is poor. Different length of each suture line have effect differently on the proliferation and cell cycle of Lung Adenocarcinoma cell A549 (P < 0.05). Conclusion Three of suture line materials have different effect on the proliferation and cell cycle of Lung Adenocarcinoma cell A549, to reflect dose-effect relation.

Lianhua YE; Yunchao HUANG; Gaofeng LI; Qilin JIN; Lincan DUAN; Xudong XIANG; Gang GUO

2009-01-01

258

Synthesis and Modification of Polypropylene by Radiation-induced Grafting  

Directory of Open Access Journals (Sweden)

Full Text Available Polypropylene fiber (PP) was radiation-induced graft polymerization of lauryl acrylate (LA) and butyl acrylate (BA)using a 60Co gamma radiation source. Then the grafted polypropylene fiber was characterized by a Fourier transforminfrared (FT-IR) spectrometer, Scanning Electron Microscopy (SEM), differential scanning calorimetry (DSC) andthermogravimetry (TG), which indicated that LA and BA have been grafted onto PP. The article focused on somefactors that influenced on the graft degree, such as the cross-linking agent concentration, monomer concentration. Theresults showed that: the degree of grafting BA reached the maximum of 20.53%, while the maximum graft degree of LAwas 29.90%.

Feng Yuan; Junfu Wei; En-qi Tang; Kong-yin Zhao; Yang Xue

2009-01-01

259

Investigation into effects of environmental radiation on polypropylene bags  

International Nuclear Information System (INIS)

Polypropylene woven bags were exposed to environmental conditions over a period of time. Samples were removed from woven bags and the tensile properties examined using an extensometer. Molar mass changes were monitored by dilute viscosity measurements. The concentration of the stabilisers was determined using UV spectroscopy. This study established the behaviour of polypropylene tapes under environmental conditions. The mechanical properties of the samples were found to deteriorate with exposure time. Also, the amount of stabiliser reduced with aging time whilst the molar mass increased suggesting crosslinking of the material occurring. The results of the study suggest that there was no difference in the performance between the stabilised and the unstabilised samples. (author).

2004-01-01

260

Preparation of organophilic clays and polypropylene nano composites  

International Nuclear Information System (INIS)

Polypropylene/montmorillonite nano composites were prepared by the melt intercalation technique. The clay was organically modified with different quaternary ammonium salts to obtain the organo clay. The modified clays with the quaternary ammonium salts were introduced in a polypropylene matrix with 3 wt. % of clay. The interlayer distance (d001) of the clay particles were obtained by X- ray diffraction and the thermal stability of the systems were investigated by thermogravimetry. The organo clay presence in the polymer matrix increased the degradation temperature in relation to the pure polymer. (author)

2011-01-01

 
 
 
 
261

Production of the oxidation-resistant polypropylene track membranes  

International Nuclear Information System (INIS)

This paper describes results of the method of manufacturing the polypropylene track membranes produced by physicochemical treatment under irradiation of accelerated heavy ions of polymer films. The developed method allows to produce membranes 0.1 - 0.2 ?m in diameter and more with an improved structural and physicochemical properties. Poly-propylene track membranes of a novel sample are characterized by high homogeneity of pore sizes in magnitude, considerable mechanical strength, advanced thermal stability and resistance to oxidation in aggressive media. It opens new fields for their usage

1999-01-01

262

Grafting polymerization of styrene onto preirradiated polypropylene fabric  

International Nuclear Information System (INIS)

Grafting copolymerization of styrene onto polypropylene fabric has been studied by using a gamma ray preirradiation technique. The polypropylene fabric samples were irradiated in an environment of air and nitrogen gas. The effects of the absorbed dose, styrene concentration in methanol, reaction temperature and reaction time on the degree of grafting were determined. The effects of a polyfunctional monomer and sulphuric acid on the grafting yield were also examined. The samples irradiated in nitrogen gas gave a much higher degree of grafting than those in air. The addition of sulfuric acid and polyfunctional monomer in the grafting solution enhanced greatly the grafting yield.

1999-03-01

263

[A comparison between chromic catgut and polyglycolic acid sutures in episiotomy repair (author's transl)  

UK PubMed Central (United Kingdom)

Polyglycolic acid sutures (Dexon) were compared to chromic catgut sutures in episiotomy repair. When polyglycolic acid sutures were used, the degree of postpartum perineal pain was approximately half as great, and the incidence of dehiscence of episiotomy was 3--5 times greater in the chromic catgut group. The cosmetic results 3 months postpartum were clearly better by using Dexon sutures, especially when the perineal skin was closed by a continuous intracutaneous suture.

Bänninger U; Bührig H; Schreiner WE

1978-01-01

264

Evaluation of polypropylene/saw dust composites prepared with maleated polypropylene (mapp) produced by reactive extrusion  

Scientific Electronic Library Online (English)

Full Text Available Abstract in english Considering the importance of the environment and fuel economy, the Brazilian automotive industry has focused on the development of lightweight materials based on renewable resources. Replacement of PP- talc composite by PP- saw dust composite is a promising possibility. This paper presents the preparation of maleated polypropylene (MAPP) through reactive extrusion using different amounts of peroxides and maleic anhydride as well its characterization. Using 20% of saw dus (more) t coated with different amounts of prepared MAPP, several composites were prepared including one with commercial MAPP. Injection molded samples of all these composites along with that without the compatibilizer were characterized for mechanical properties. These studies indicated fulfilling the proposed objectives: (i) finding the optimal reactive extrusion conditions to prepare MAPP samples; (ii) preparation of PP/saw dust composites with and without MAPP coating; (iii) to arrive at optimized composite to get the best performance through their characterization for various properties of all the produced composites.

Trombetta, Ernani; Flores-Sahagun, Thais; Satyanarayana, Kestur G.

2010-01-01

265

Biomechanical comparison of tibial eminence fracture fixation with high-strength suture, EndoButton, and suture anchor.  

UK PubMed Central (United Kingdom)

PURPOSE: To biomechanically compare anterior cruciate ligament (ACL) tibial bony avulsion fixation by suture anchors, EndoButtons (Smith & Nephew, Andover, MA), and high-strength sutures subjected to cyclic loading. METHODS: Type III tibial eminence fractures were created in 49 ovine knees, and 7 different types of repairs were performed. Each repair group contained 7 specimens. The repair groups were as follows: No. 2 FiberWire (Arthrex, Naples, FL); No. 2 UltraBraid (Smith & Nephew); No. 2 MaxBraid (Arthrotek, Warsaw, IN); No. 2 Hi-Fi (ConMed Linvatec, Largo, FL); No. 2 OrthoCord (DePuy Mitek, Raynham, MA); Ti-Screw suture anchor (Arthrotek); and titanium EndoButton. These constructs were cyclically loaded (500 cycles, 0 to 100 N, 1 Hz) in the direction of the native ACL and loaded to failure (100 mm/min). Endpoints included ultimate failure load (in Newtons); pullout stiffness (in Newtons per millimeter); cyclic displacement (in millimeters) after 100 cycles, between 100 and 500 cycles, and after 500 cycles; and mode of failure. Bone density testing was performed in all knees. RESULTS: Bone density was not different among the groups. The EndoButton group had a higher ultimate failure load than the FiberWire, UltraBraid, Hi-Fi, and suture anchor groups (P < .05). The MaxBraid and OrthoCord groups had higher failure loads than the suture anchor group (P < .05). The MaxBraid group also had a higher failure load than the Hi-Fi group (P < .05). Stiffness was not statistically different for the various tested constructs. After 100 cycles, the EndoButton group had less displacement than the FiberWire, UltraBraid, MaxBraid, and Hi-Fi groups (P < .05). The suture anchor group had less displacement than the Hi-Fi and FiberWire groups (P < .05). The displacements of the different tested constructs between 100 and 500 cycles and total displacements after 500 cycles were not statistically different. The predominant failure mode was suture rupture. CONCLUSIONS: Under cyclic loading conditions in an ovine model, EndoButton fixation of tibial eminence fractures provided greater initial fixation strength than suture anchor fixation or fixation with various high-strength sutures except for OrthoCord. CLINICAL RELEVANCE: During initial cyclic loading of ACL tibial eminence fractures, the strength of the repair construct should be taken into consideration because conventional suture repair even with ultrahigh-molecular-weight polyethylene sutures may not provide enough strength.

Hapa O; Barber FA; Süner G; Özden R; Davul S; Bozda? E; Sünbülo?lu E

2012-05-01

266

[Effectiveness comparison between modified percutaneous suture and conventional open suture in repairing acute closed achilles tendon rupture].  

UK PubMed Central (United Kingdom)

OBJECTIVE: To investigate the effectiveness of modified percutaneous suture in repairing acute closed Achilles tendon rupture by comparing with conventional open suture. METHODS: Between January 2006 and October 2009, 50 patients with acute closed Achilles tendon rupture were treated with modified percutaneous suture by making 5 small incisions at both sides of Achilles tendon and zigzag suture (improved group, n=22) and with Kessler suture (conventional group, n=28), respectively. No significant difference was found in gender, age, time from injury to operation between 2 groups (P > 0.05). RESULTS: In improved group, the patients achieved healing of incisions by first intention after operation and no complication occurred; however, incision infection occurred in 1 case, Achilles tendon re-rupture in 1 case, and incision scar contracture in 2 cases in conventional group. The operation time of improved group [(38.7 +/- 6.6) minutes] was significantly shorter (t=-12.29, P=0.00) than that of conventional group [(52.3 +/- 6.9) minutes]; the blood loss of improved group [(4.9 +/- 2.0) mL] was significantly less (t=-25.20, P=0.00) than that of conventional group [(40.7 +/- 7.1) mL]. The patients were followed up 2-3 years (mean, 29.9 months). The American Orthopaedic Foot and Ankle Society (AOFAS) score was 99.6 +/- 1.0 in improved group and was 98.4 +/- 3.0 in conventional group, showing no significant difference between 2 groups (t=1.66, P=0.10). CONCLUSION: Comparison with conventional open suture, modified percutaneous suture has some advantages, such as easy operation, less complications, rapid recovery of limb function, and so on. Modified percutaneous suture is one of the best choices for the treatment of acute closed Achilles tendon rupture.

Chu H; Xu Y; Chu H; Xu Y; Zhou F; Yu X; Li H; Ji X

2012-06-01

267

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

UK PubMed Central (United Kingdom)

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

Milone M; Di Minno MN; Galloro G; Maietta P; Bianco P; Milone F; Musella M

2013-09-01

268

Near-surface deformation in polypropylene blends  

Science.gov (United States)

Polypropylene blends with up to 20% rubber phase are known as thermoplastic polyolefin or TPO and have been widely used in the automotive industry in both painted and unpainted components. Poor scratch resistance and paint adhesion have been of great concern for TPO applications. The research described in this thesis has addressed both of these issues by studying the near-surface deformation under scratches in unpainted TPO, and the interfacial adhesion and deformation of painted TPO. A transmission electron microscopy approach has been developed to study the microstructure and microdeformation in this important class of engineering materials. It was observed that highly oriented near-surface material in injection-molded TPO plastically deformed by forming periodic shear bands under scratches. The material inside the shear band dilated as revealed by the difference in the angles between the shear band boundary and the rubber particles inside and outside the shear bands. The extent of material dilation inside the shear bands decreased with the distance from the free surface and increased with normal applied load. At high applied normal loads (>400 g), a significant amount of voiding caused by the debonding between the rubber phase and the PP matrix was observed. Talc particles were found to preferentially wet the rubber phase and this may prevent debonding between talc particles and the PP matrix as observed in talc-filled pure PP. The anisotropy in scratching behavior correlates with the anisotropy in mechanical properties. The morphology of the scratching deformation was found to be particularly sensitive to the near-surface structural anisotropy. A tensile cracking test was applied to quantitatively measure the interfacial adhesion between paint and TPO substrates. Interfacial structure between chlorinated polyolefin adhesion promoter and TPO substrate was studied by electron microscopy. The swelling of the rubber phase near the interface was observed, evidently arising from the interaction with the solvent in the paint and adhesion promoter. Diffusion of the rubber phase near the interface was also observed. Baking at high temperature enhanced both the swelling and interfacial diffusion of rubber phase. Paint adhesion was improved in TPO substrates with lower molecular weight PP homopolymer, which was ascribed to the enhanced interfacial diffusion.

Tang, Honxiang

269

Compatibilisation of Polypropylene/Ethylene Propylene Diene Terpolymer/Kaolin Composites: The Effect of Maleic Anhydride-Grafted-Polypropylene  

Directory of Open Access Journals (Sweden)

Full Text Available The tensile properties and morphology of polypropylene (PP)/ethylene propylene diene terpolymer (EPDM)/Kaolin composites were investigated. Maleic anhydride-grafted-polypropylene (MAPP) was used as a compatibiliser to improve the compatibility of kaolin filled PP/EPDM composites. Results show that incorporation of MAPP increased the tensile strength and Young’s modulus, but reduced the elongation at break. Scanning electron microscopy (SEM) of the tensile fracture surfaces of composites indicates that the MAPP improved the interfacial interaction between kaolin and PP/EPDM matrix.

H. Salmah; C.M. Ruzaidi; A.G. Supri

2009-01-01

270

Effect of Maleated Polypropylene (MAPP) on the Tensile, Impact and Thickness Swelling Properties of Kenaf Core – Polypropylene Composites  

Directory of Open Access Journals (Sweden)

Full Text Available The study on the kenaf core fiber – polypropylene (PP) composites with treated and non-treated maleated polypropylene (MAPP) was done. Epolene-43 which is commercially MAPP was used to determine MAPP’s effectiveness as a coupling agent for kenaf fiber-composites. The hot pressing system for producing kenaf core-PP composite has been used. The tensile, impact and thickness swelling results of the epolene 43 treated composite samples were better than those of the untreated composites. Scanning electron microscopy micrograph proved that the interfacial region of treated composite board shows good interaction among kenaf’s wood fiber and PP components.

Mohamad Jani Saad

2011-01-01

271

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

UK PubMed Central (United Kingdom)

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

Lee SC; Chang WH; Park SJ; Kim TH; Sung BY

2013-01-01

272

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

Science.gov (United States)

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

Apt, L; Henrick, A

273

Effect of recombinant human platelet-derived growth factor-BB-coated sutures on Achilles tendon healing in a rat model: A histological and biomechanical study  

Directory of Open Access Journals (Sweden)

Full Text Available Purpose: Repairing tendon injuries with recombinant human platelet-derived growth factor-BB has potential for improving surgical outcomes. Augmentation of sutures, a critical component of surgical tendon repair, by coating with growth factors may provide a clinically useful therapeutic device for improving tendon repair. Therefore, the purpose of this study was to (a) coat Vicryl sutures with a defined dose of recombinant human platelet-derived growth factor-BB without additional coating excipients (e.g. gelatin), (b) quantify the recombinant human platelet-derived growth factor-BB released from the suture, and (c) use the recombinant human platelet-derived growth factor-BB-coated sutures to enhance tendon repair in a rat Achilles tendon transection model. Methods: Vicryl sutures were coated with 0, 0.3, 1.0, and 10.0 mg/mL concentrations of recombinant human platelet-derived growth factor-BB using a dip-coating process. In vitro release was quantified by an enzyme-linked immunosorbent assay. Acutely transected rat Achilles tendons were repaired using one of the four suture groups (n = 12 per group). Four weeks following repair, the tensile biomechanical and histological (i.e. collagen organization and angiogenesis) properties were determined. Results: A dose-dependent bolus release of recombinant human platelet-derived growth factor-BB occurred within the first hour in vitro, followed by a gradual release over 48 h. There was a significant increase in ultimate tensile strength (p < 0.01) in the two highest recombinant human platelet-derived growth factor-BB dose groups (1.9 ± 0.5 and 2.1 ± 0.5 MPa) relative to controls (1.0 ± 0.2 MPa). The modulus significantly increased (p = 0.031) with the highest recombinant human platelet-derived growth factor-BB dose group (7.2 ± 3.8 MPa) relative to all other groups (control: 3.5 ± 0.9 MPa). No significant differences were identified for the maximum load or stiffness. The histological collagen and angiogenesis scores were comparable in all groups, although there was a trend for improved collagen organization in the recombinant human platelet-derived growth factor-BB-treated groups (p = 0.054). Conclusions: The results of this study suggest that recombinant human platelet-derived growth factor-BB can be used to reproducibly coat Vicryl sutures and improve remodeling in a rat Achilles tendon transection model by significantly decreasing the resulting cross-sectional area, thus improving the material properties of the repaired tendon.

Stephen H Cummings; Daniel A Grande; Christopher K Hee; Hans K Kestler; Colleen M Roden; Neil V Shah; Pasquale Razzano; David M Dines; Nadeen O Chahine; Joshua S Dines

2012-01-01

274

Midwives conducting perineal repair: The Danish Suture Trial  

DEFF Research Database (Denmark)

Midwives conducting perineal repair: The Danish Suture Trial.     Background Suture techniques and materials for repair of 2nd degree perineal lacerations and episiotomies have been tested in several clinical trials. Danish midwives and obstetricians have developed a new, simple and time-efficient suture technique which needed systematic evaluation. Objective To compare two standardized suture techniques for perineal repair of 2nd degree perineal lacerations or episiotomies. Design and setting A double-blind randomised clinical trial conducted in Aarhus University Hospital, Denmark. Initiated August 2004, enrolment of patients finished October 2005. Sample size: 400. Inclusion: Healthy primipara sustaining a 2nd degree perineal laceration or an episiotomy following vaginal birth. Perineal repair was carried out by a midwife. Exclusion: Lacerations involving the sphincter ani, post partum haemorrhage >1000 ml, Diabetes, mental disorders. Both suture techniques were 2-layered using a polyglactin910 multifilament suture (Vicryl Rapid or Vicryl). Treatment A was a continuous suture technique and treatment B was interrupted, inverted stitches. Primary outcomes: Perineal pain and wound healing assessed day 1-2 and 10 post partum. Secondary outcomes: patient satisfaction with wound healing, need for secondary repair, superficial pain during intercourse.   Data management: Double entry of all data and intention-to-treat analysis.   Results The follow up rate was 97%. Baseline data were evenly distributed between the two treatment groups. Major difference in pain and healing was observed between spontaneous lacerations and episiotomies. Follow up 6 months post partum will be finished by April 2006.   Conclusion Primary results will be presented on the NFOG Congress in Göteborg, May 2006.

Kindberg, Sara

2007-01-01

275

POLYPROPYLENE FIBERS POTENTIALS IN THE IRAQI CEMENTITIOUS CONCRETE CONSTRUCTIONS  

Directory of Open Access Journals (Sweden)

Full Text Available An experimental study is achieved to investigate the polypropylene fibers potentials on the mechanical performance of concrete constructions. It is found that an addition of 1% and 2% of polypropylene fibers to concrete mixes produces a reduction ofconcrete slump 20% and 28% respectively comparing with conventional mix (0% of polymer) and an increasing in compressive strength of (13.1 % and 19% after 7days), (8.5% and 14.3% after 28days), and (12.25% and 17.2% after 90days) respectively. There is also an increasing in flexural strength of (11.1 % and 18.3% after 7days), (13% and 24% after 28days), and (13.8% and 20.7% after 90days)respectively as well as an increasing in splitting tensile strength of (7 % and 11.6% after 7days), (12.5% and 17.8% after 28days), and (19% and 22.4% after 90days) respectively. It can also be observed that at the age of 90days the addition of the polypropylene enhances the tensile mechanical performance of the concrete members due to the strengthening effect of polypropylene fiber reinforcement to concrete paste.

Arkan Radi Ali

2013-01-01

276

CRUDE PALM OIL AS A BIOADDITIVE IN POLYPROPYLENE BLOWN FILMS  

Directory of Open Access Journals (Sweden)

Full Text Available Growing public concern about environment and potential risks to health in the polymer and plasticizer industry promises to increase the market for a safer alternative plasticizer such as a vegetable oil-based agent. The purpose of this study was to investigate the potential of crude palm oil as a bio-additive in polypropylene blown films. The polypropylene was blended with 1%, 3%, and 5% dosages of CPO using a twin screw extruder. The extruded samples were blown using the blown thin film technique. Mechanical, physical, and morphological properties were characterized. Modifying polypropylene with CPO showed good enhancement in the mechanical properties of the polypropylene. Tensile strength, elongation at break, impact strength, and tear strength all increased. The scanning electron microscopy photographs of the CPO-modified PP clearly supported the results from the mechanical strength tests. The presence of CPO in the PP matrices decreased the density and increased the melt flow rate. These findings contribute new knowledge to the additives area and give important implications for designing and manufacturing polymer packaging materials.

Emiliana Rose Jusoh,; Mohd Halim Shah Ismail,; Luqman Chuah Abdullah,; Robiah Yunus,; Wan Aizan Wan Abdul Rahman

2012-01-01

277

Upgrading of recycled polypropylene by preparing flame retarded layered composite  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Upgrading of polypropylene waste was performed by different composite technologies, in order to improve the flame retardancy combined with preserved or improved mechanical properties. The polymer waste of density below 900 kg/m3 is originated from end-of-life vehicles (ELV) after comminution, densit...

B. Bodzay; M. Fejos; K. Bocz; A. Toldy; F. Ronkay; Gy. Marosi

278

[Measurement of ethylene content in polypropylene by Raman spectrum].  

Science.gov (United States)

Ethylene content in polypropylene was studied by Raman spectrum, combined with partial least squares (PLS) method. The comparison between Raman spectra for polyethylene and polypropylene was carried out, and the spectra between 50 and 600, 600 and 1600, and 2700 and 3100 cm(-1) were analyzed respectively. The models for ethylene content prediction were built, while the model based on 50-3600 cm(-1) spectra gave the best performance. The experiment indicated that Raman spectrum gave the similar predictive results as the near infrared (NIR) spectrum; the values of correlation coefficient (r), relative average deviation (RAD) and root mean square error (RMSE) between predictive results and actual values were 0.995, 2.65% and 0.319, respectively. According to PLS analysis, the loadings of factor 1 could reflect the relationship between the composition of polypropylene molecular chain and ethylene content, and ethylene content had a positive correlation with CH2 content, but a negative correlation with content of CH3, C-H, and C-C. The results indicated that it was feasible to detect the ethylene content in polypropylene by Raman spectrum. PMID:21595224

Chen, Mei-juan; Wang, Jing-dai; Jiang, Bin-bo; Yang, Yong-rong; Chen, Jie-xun; Liao, Zu-wei

2011-03-01

279

[Measurement of ethylene content in polypropylene by Raman spectrum].  

UK PubMed Central (United Kingdom)

Ethylene content in polypropylene was studied by Raman spectrum, combined with partial least squares (PLS) method. The comparison between Raman spectra for polyethylene and polypropylene was carried out, and the spectra between 50 and 600, 600 and 1600, and 2700 and 3100 cm(-1) were analyzed respectively. The models for ethylene content prediction were built, while the model based on 50-3600 cm(-1) spectra gave the best performance. The experiment indicated that Raman spectrum gave the similar predictive results as the near infrared (NIR) spectrum; the values of correlation coefficient (r), relative average deviation (RAD) and root mean square error (RMSE) between predictive results and actual values were 0.995, 2.65% and 0.319, respectively. According to PLS analysis, the loadings of factor 1 could reflect the relationship between the composition of polypropylene molecular chain and ethylene content, and ethylene content had a positive correlation with CH2 content, but a negative correlation with content of CH3, C-H, and C-C. The results indicated that it was feasible to detect the ethylene content in polypropylene by Raman spectrum.

Chen MJ; Wang JD; Jiang BB; Yang YR; Chen JX; Liao ZW

2011-03-01

280

Colorimetry analysis of polypropylene-polyethylene base copoliners  

International Nuclear Information System (INIS)

In this paper, crystallisation process study has been performed, from the molten material, in polypropylene-polyethylene (PP-PE) copolymers rich in PP (? 95 wgh.%), using different additives. Some samples have been artificially aged. Calorimetric analysis has been performed by different scanning calorimetry (DSC), from which crystallisation kinetics has been studied under dynamic conditions. (Author) 22 refs

1998-01-01

 
 
 
 
281

Functional Block Copolymers as Compatibilizers for Nanoclays in Polypropylene Nanocomposites  

Digital Repository Infrastructure Vision for European Research (DRIVER)

With the aim of creating tough nanocomposits (NC) [1] based on polypropylene (PP) and nanoclay (NCl) in the framework of the 7th EU program NANOTOUGH we have designed amphiphilic block copolymers utilizing Atom Transfer Radical Polymerization (ATRP) [2]. They consist of a hydrophobic block of Kraton...

Jankova Atanasova, Katja; Daugaard, Anders Egede; Stribeck, Norbert; Zeinolebadi, Ahmad; Sari, Morteza Ganjaee

282

Effects of gamma irradiation on the physical properties of laminated packaging materials. 2. polypropylene-polypropylene, polypropylene-polyethylene, and polyester-polyethylene  

International Nuclear Information System (INIS)

[en] This experiment was done to determine the effects of irradiation on the physical properties of three kinds of laminated packaging materials, i.e. polypropylene-polypropylene, polypropylene-polyethylene, polyester-polyethylene. Observations were made on pinhole production, leakage, oil resistance, resistance against insect penetration, colour, odour tensile strength, elongation at break, seal strength and tear resistance. The samples were irradiated with doses of 0, 5 and 10 kGy, then stored at room temperature and examined after 0, 3, 6 and 12 months of storage. The results showed that irradiation doses up to 10 kGy, as well as storage up to 12 months, did not create pinholes, or leakage in pouches prepared from laminated films. The resistance of the films to oil and insect penetration, the colour, and the odour were also unchanged. Both irradiation and storage treatments had a significant effect on physical properties of the laminated films. In general, the changes started to be significant after 6 months' storage either in unirradiated samples or in irradiated ones. It could be concluded that irradiation with doses up to 10 kGy had no meaningful effect on the physical strength of the laminated films, therefore such films could be used as packaging materials for irradiated foods. (author)

1985-01-01

283

Mesh fixation with a barbed anchor suture results in significantly less strangulation of the abdominal wall.  

UK PubMed Central (United Kingdom)

BACKGROUND: Laparoscopic ventral hernia repair using an underlay mesh frequently requires suture fixation across the abdominal wall, which results in significant postoperative pain. This study investigates the utility of a novel mesh fixation technique to reduce the strangulation force on the abdominal wall. METHODS: Multiple 2-cm(2) pieces of polyester mesh (Parietex Composite, Covidien) were placed as an underlay against a porcine abdominal wall. Fixation was accomplished using either the standard 0-polyglyconate or the 0-polyglyconate barbed anchor suture designed to hold in tissue without the need to tie a knot (V-Loc 180; Covidien). Suture fixation began with a stab wound incision in the skin. A suture-passing device then was used to pass the suture across the abdominal wall and through the mesh. The suture passer was removed and reintroduced through the same stab wound incision but at a different fascial entry point 1.5 cm away. The tail of the suture was grasped and pulled up through both the mesh and the abdominal wall, creating a full-thickness U-stitch. One tail of the suture was attached to a tensiometer, and the strangulation force on the abdominal wall was measured while the suture was tied (standard) or looped (barbed). To compare pullout force, the tensiometer was attached to either the mesh or the suture, and traction was applied until material failure or suture pull through. Results are expressed as mean ± standard deviation. Comparisons were performed using Student's t-test. RESULTS: Eight pieces of mesh were placed for each suture. The average force required to secure the barbed suture (0.59 ± 0.08 kg) was significantly less than the force needed to secure the standard suture (2.17 ± 0.58 kg) (P < 0.0001). Table 1 compares the suture pullout forces with the mesh failure forces. Although the pullout force for the standard suture is significantly greater than for the barbed suture, both sutures have a pullout strength significantly greater than the mesh failure force. Table 1 Suture fixation forces for standard and barbed sutures Suture fixation force (kg) Standard suture 2.17 ± 0.58 Barbed suture 0.59 ± 0.08 P < 0.0001 CONCLUSIONS: A barbed anchor suture used to secure mesh to the abdominal wall requires nearly 75% less strangulation force than a standard monofilament suture while still providing significantly greater pullout force than that required for the mesh to tear and fail. This method of mesh fixation should result in less postoperative pain and warrants a clinical trial.

Lyons C; Joseph R; Salas N; Reardon PR; Bass BL; Dunkin BJ

2012-05-01

284

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

UK PubMed Central (United Kingdom)

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

Fukushima K; Okano T; Negishi S; Horaguchi T; Sato K; Saito A; Ryu J

2005-06-01

285

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

Science.gov (United States)

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

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

2005-06-01

286

Propriedades mecânicas de nanocompósitos de polipropileno e montmorilonita organofílica Mechanical properties of polypropylene and organophilic montmorillonite nanocomposites  

Directory of Open Access Journals (Sweden)

Full Text Available Neste trabalho foram preparados nanocompósitos de polipropileno e montmorilonita organofílica comercial Cloisite 20A em concentrações de 2,5%, 5,0%, 7,5% e 10,0% e polipropileno graftizado com anidrido maleico como agente compatibilizante pela técnica de intercalação do fundido em extrusora de dupla rosca. Os materiais obtidos foram caracterizados por difração de raios x, ensaios de tração e impacto de acordo com as normas ASTM D638 e D256, respectivamente. Os resultados de difração de raios x indicaram a formação de nanocompósitos com estruturas parcialmente esfoliadas ou intercaladas, dependendo da composição, que proporcionaram aumento do módulo de elasticidade enquanto as propriedades de resistência ao impacto não foram satisfatórias.Nanocomposites of polypropylene and commercial montmorillonite organophilic Cloisite 20A containing 2.5%, 5%, 7.5% and 10% of clay with polypropylene-graft-maleic anhydride as coupling agent were prepared through the melt intercalation by twin-screw extruder. The materials were characterized by x-ray diffraction, tensile and impact properties according to ASTM D638 and D256 test methods, respectively. The x-ray diffraction results showed exfoliated or intercalated structures for different concentrations of the clay. The tensile modulus improved with the increase of the amount of the clay while the impact strength showed unsatisfactory results.

Lucilene B. de Paiva; Ana R. Morales; Thiago R. Guimarães

2006-01-01

287

Propriedades mecânicas de nanocompósitos de polipropileno e montmorilonita organofílica/ Mechanical properties of polypropylene and organophilic montmorillonite nanocomposites  

Scientific Electronic Library Online (English)

Full Text Available Abstract in portuguese Neste trabalho foram preparados nanocompósitos de polipropileno e montmorilonita organofílica comercial Cloisite 20A em concentrações de 2,5%, 5,0%, 7,5% e 10,0% e polipropileno graftizado com anidrido maleico como agente compatibilizante pela técnica de intercalação do fundido em extrusora de dupla rosca. Os materiais obtidos foram caracterizados por difração de raios x, ensaios de tração e impacto de acordo com as normas ASTM D638 e D256, respectivamente. Os (more) resultados de difração de raios x indicaram a formação de nanocompósitos com estruturas parcialmente esfoliadas ou intercaladas, dependendo da composição, que proporcionaram aumento do módulo de elasticidade enquanto as propriedades de resistência ao impacto não foram satisfatórias. Abstract in english Nanocomposites of polypropylene and commercial montmorillonite organophilic Cloisite 20A containing 2.5%, 5%, 7.5% and 10% of clay with polypropylene-graft-maleic anhydride as coupling agent were prepared through the melt intercalation by twin-screw extruder. The materials were characterized by x-ray diffraction, tensile and impact properties according to ASTM D638 and D256 test methods, respectively. The x-ray diffraction results showed exfoliated or intercalated structu (more) res for different concentrations of the clay. The tensile modulus improved with the increase of the amount of the clay while the impact strength showed unsatisfactory results.

Paiva, Lucilene B. de; Morales, Ana R.; Guimarães, Thiago R.

2006-06-01

288

The simple transverse intraosseous phalangeal suture for zone 1 flexor digitorum profundus injuries: case series and review of the literature.  

UK PubMed Central (United Kingdom)

BACKGROUND: Zone 1 flexor digitorum profundus injury often precludes the use of a simple core suture as a result of a distal remnant that is too short. The aim of this study was to assess the senior author's (S.I.) simple technique for reinsertion of the flexor digitorum profundus tendon. METHODS: The case series consisted of 12 patients who required a primary flexor digitorum profundus repair in zone 1, with all repairs performed by the senior author. A Bruner incision was extended to the pulp to expose the base of the distal phalanx. A two-strand repair was anchored to the distal phalanx using the author's technique, which involved passing a 3-0 polypropylene suture on a straight needle through a hypodermic needle that had been drilled through the base of the distal phalanx. This provided a stable, intraosseous, internal repair, allowing a standard early active mobilization regimen. RESULTS: Two patients had excellent results and 10 had good results in terms of distal interphalangeal joint range of movement (mean, 57 degrees; range, 51 to 80 degrees) and Quick Disabilities of the Arm, Shoulder and Hand questionnaire scores (mean, 12; range, 0 to 31.8). There were no reported tendon ruptures at the time of writing this article (range, 6 to 37 months after surgery). CONCLUSIONS: The authors present a technique for the repair of zone 1 flexor digitorum profundus injuries that is simple, can be performed quickly, is easily learned, and has results that compare favorably with other techniques in the literature. Furthermore, there is limited morbidity to surrounding fingertip structures. CLINICAL QUESTION/LEVEL OF EVIDENCE: Therapeutic, IV.

Markeson DB; Evgeniou E; Choa R; Iyer S

2013-05-01

289

A comparison of sutureless and antibacterial suture abdomen closure.  

UK PubMed Central (United Kingdom)

PURPOSE: This experimental study aimed at comparing the cyanoacrylate abdomen closure to the effectiveness of triclosan coated polidioxanone abdomen closure. METHODS: The abdomen layers were closed with 3/0 polidioxanone suture in the first group. In the second group, the layers were closed with triclosan coated polidioxanone suture in a single layer. The abdomen layers of rats in the third group were attached with cyanoacrylates without sutures. The rats were sacrificed on the 14th day and the adhesive level was recorded. The incision resistance strength was measured. The tissue was examined blindly in the terms of inflammatory cell infiltration, capillary proliferation, fibrosis and micro-abscess by the pathologist. RESULTS: No significant difference was determined between the 1st and 2nd groups in the terms of inflammatory cell infiltration, capillary proliferation, collagen deposition, fibroblast activity, adhesive and tissue distension strength. The fibrosis and adhesive rate of the 3rd group was significantly higher than the 1st and 2nd groups statistically. The tissue distension strength was lower than in the other groups and the differences between the groups were found to be significant (p < 0.05). No significant difference was determined between the groups in the term of micro-abscess. CONCLUSIONS: Antibacterial suture is not superior to the conventional suture. It is concluded that cyanoacrylate is not an appropriate molecule for abdomen closure (Tab. 1, Fig. 3, Ref. 17).

Okus A; Karahan O; Ay S; Eryilmaz MA; Unlu Y; Aksoy N; Sevinc B

2013-01-01

290

Outcomes of suture button repair of the distal tibiofibular syndesmosis.  

UK PubMed Central (United Kingdom)

BACKGROUND: Recently, a suture button device has been advocated as a simple and effective method of repairing the syndesmosis. Proponents of the device have cited earlier weightbearing and elimination of the need for device removal as potential advantages over metallic screws. However, the available reports generally have short followup. With longer followup, some concerns about the suture button device have surfaced. MATERIALS AND METHODS: We reviewed the clinical and radiographic results of 24 patients with acute injuries to the distal tibiofibular syndesmosis who were treated with suture button fixation. Average followup was 20 months. The primary outcomes measure was the AOFAS ankle hindfoot score. Secondary outcomes measures included a calibrated measurement of the tibiofibular clear space and tibiofibular overlap. RESULTS: The average AOFAS score was 94 points. Syndesmotic parameters returned to normal after surgery and remained normal throughout the followup period. One in four patients required removal of the suture endobutton device due to local irritation or lack of motion. Osteolysis of the bone and subsidence of the device into the bone was observed in four patients. Three patients developed heterotopic ossification within the syndesmotic ligament, one mild, one moderate, and one who had a nearly complete syndesmotic fusion. CONCLUSION: The suture button device is an effective way to repair the syndesmosis. In our series, the reduction of the syndesmosis was maintained throughout the followup period. However, reoperation for device removal was more common than anticipated. Osteolysis of the bone near the implant and subsidence of the device may occur.

Degroot H; Al-Omari AA; El Ghazaly SA

2011-03-01

291

Complexity of serrated sutures of a human skull  

Directory of Open Access Journals (Sweden)

Full Text Available Objective: to reveal the variability mechanism of complexity of serrated sutures of a human skull in the correlation with cranial form. Materials and methods. Researches of 253 arches of male and female skulls of patients at the age of 1 day-105 years without signs of cranial trauma or skeletal systemic diseases with absence of morphological signs of increase of intracranial pressure. Minimal (Min) and maximal (Max) values, average arithmetic (M), a mistake of average arithmetic (m) have been studied. For definition of reliability of average size difference parametrical and non-parametric statistical criteria were used: parametrical criterion (t-criterion of Student) applied for parameters submitting to the law of normal distribution (Lakin G. R, 1990). Distinctions of average arithmetic size were considered statistically authentic from 95% (p<0,05) a level of correct judgement (Plokhinskiy N.A., 1970). Results. On the surface of the arch lambdoid and coronal sutures in male skulls and lambdoid and sagittal sutures in female were found out to be of the greatest degree of complexity. Conclusion. The increase of complexity of sutures has been observed in children and adolescents; the directed asymmetry of sutures form is absent

Kochenkova ?.V.; Zaichenko A.A.; Anisimova ?.?.; Anisimov D.I.

2011-01-01

292

Mechanical Behavior of Bio-inspired Model Suture Joints  

Science.gov (United States)

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

293

Development of foams from linear polypropylene (PP) and high melt strength polypropylene (HMSPP) polymeric blends  

International Nuclear Information System (INIS)

Foamed polymers are future materials, with a comprehensive application field. They can be used in order to improve appearance of insulation structures, for example, or to reduce costs involving materials. This work address to Isotactic Polypropylene / High Melt Strength Polypropylene blends, for foams production. Rheological behavior of polymer melt, especially referring to viscosity in processing temperature, plays a decisive role in applications where dominates extensional flow, as in case of foaming. If the viscosity is very low, it will correspond to a low melt strength, as in case of linear homopolymer (Isotact PP), and the foam will be prejudiced, due to the impossibility of expansion. Otherwise, if the viscosity is very high, with a high melt strength, the foam will collapse immediately after its formation. In order to get foams with an homogeneous and defined cellular structure, there were accomplished blends, 50% in weight, between linear homopolymer (isotactic PP) and HMSPP, from PP modified as per gamma radiation, in acetylene environment and at a 12.5 kGy doses. Extrusion process used a soluble foaming methodology, according to a processing/dissolution principle, which involves the dissolution of a Physical Blowing Agent (PBA), under 30 bar pressure, homogeneously mixed with polymeric melt. Extrusion conditions, that generally involve temperature, pressure and viscoelastic material flow control were experimentally investigated to define prevalent characteristics for producing foams. Nitrogen was the used PBA and process extrusion parameters were adapted to PP, HMSPP and their 50% in weight mixtures thereof. Major PP and HMSPP characteristics were obtained via melt Index and melt strength and thermal analyses (DSC/TGA), in order to make viable and to reproduce foaming as per extrusion process. Foams cellular morphology of PP, HMSPP and their 50% in weight mixtures thereof was investigated, with and without talc addition, as nucleating agent, by using Scanning Electron Microscope (SEM). Micrographs obtained pointed to closed cells foams, in which the pressure is kept during all cell formation stage, informing that closed cells foams are used in thermal insulation in Civil Construction and in thermal vials. Density analyses accomplished in foams produced in our work showed typical results for high density foams (320 to 800 kg/m3 range), around 500 kg/m3, used for wire and cables and for structural purposes (structural foams), by replacing wood, metals or solid plastics. Structural foams have high density (above 320 kg/m3) and cellular structures are specially composed by holes. (author)

2009-01-01

294

Magnetic and transport properties in Gd$_{1-x}$Sr$_x$CoO$_{3}$ ($x$= 0.10-0.70)  

CERN Document Server

Magnetic and transport properties of polycrystalline Gd$_{1-x}$Sr$_x$CoO$_{3}$ ($x$= 0.10-0.70) are investigated systemically. Cluster-glass magnetism for $x \\leq$ 0.45 and long-range ferromagnetic order in higher doping level are observed. Transport measurements indicate insulator-like behaviors for the samples with $x \\leq$ 0.30, and an insulator-metal (IM) transition around $x$ = 0.35, and metallic behaviors for higher $x$ samples. In contrast to La$_{1-x}$Sr$_{x}$COO$_{3}$, the striking feature is that the system reenters insulator-like state for $x \\geq$ 0.60, and the long-range ferromagnetic order and IM transition take place in samples with higher Sr content. It could be attributed to the enhancement of low-spin state stability for the trivalent Co ions due to the small radius of Gd$^{3+}$ ion.

Luo, X G; Chen, X H; Xiong, Y M; Wang, G Y; Wang, C H; Miao, W J; Li, X; 10.1021/0521471

2006-01-01

295

Suture Retention Strength of Expanded Polytetrafluoroethylene (ePTFE) Graft  

Directory of Open Access Journals (Sweden)

Full Text Available 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.

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

2010-01-01

296

Long term tissue responses to catgut and collagen sutures.  

UK PubMed Central (United Kingdom)

Reaction of catgut and collagen sutures in both wounded and nonwounded bladder, kidney, muscle, and liver tissue was studied in guinea pigs up to 130 days after implantation. A minimal amount of degradation of ths so-called absorbable sutures was observed. There was little difference in absorption rates in the tissues studied although there seemed to be slightly greater absorption in the kidney than in other tissues. Tissue responses were characterized by the formation of a bilaminar connective tissue capsule. The inner zone contained primarily fibroblasts and histiocytes, while lymphocytes, neutrophils, and eosinophils were scattered throughout both layers. Multinucleated giant cells were often observed in the inner layer, and aggregates of lymphocytes and mast cells were occasionally found in the pericapsular areas. Calculi formed on those suture loops that were loosely tied and thus projected into the bladder lumen.

Bartone FF; Shervey PD; Gardner PJ

1976-05-01

297

[Three-port laparoscopic suture-suspension cholecystectomy].  

UK PubMed Central (United Kingdom)

The technique of laparoscopic cholecystectomy still presents scope for further refinement. Many surgeons simply eliminate the most lateral trocar. In this way they lose the lateral traction on the gallbladder neck, thus closing Calot's triangle instead of opening it. This manoeuvre increases the risk of biliary lesions. In our opinion, in order to reduce the number of ports, a cannula may be replaced by a percutaneous suture suspension of the gallbladder. One hundred and fifty consecutive patients with symptomatic cholelithiasis were submitted to a "three-port suture-suspension cholecystectomy" by the same surgeon. In 24 cases a fourth trocar was necessary. No common bile duct injuries were registered. Three-port suture-suspension cholecystectomy seems to be a feasible and effective technique. Above all, it is a safe operation inasmuch as the basic rules of cholecystectomy are respected.

Tebala GD

2008-03-01

298

Percutaneous Mesh Expansion and Fixation at the Retro-Rectus Plane without Stabs by Using Redirecting Suture Hook in Midline Hernias Repair  

Directory of Open Access Journals (Sweden)

Full Text Available Background: Mesh expansion and fixation at retro-rectus plane through multiples stabs produces good results. But these stabs cause cosmetic disorders for the patients and doctors. So, we find some modification to do this procedure without these stabbing wounds in midline hernial repair. Patients and methods: This technique was used to fix the mesh at retro-rectus plane in 50 patients suffering from midline hernias, from January 2008 through January 2010 at Zagazig university Hospital, Egypt. Laparotomy incision was done over the hernial sac or at old incision; the contents were then released and reduced into peritoneal cavity without much subcutaneous dissection. The suitable sheet of polypropylene mesh to cover the hernial defect and any weak area was prepared and fixed at retro-rectus plane percutaneously without stabbing wounds by using redirecting suture hook. The mean period of follow up was 26 months. Results: There was no recurrence during the period of follow up. Five patients developed subcutaneous bluish discoloration at the site of some stitches, which disappear within two weeks with conservative treatment. Conclusion: Percutaneous mesh expansion and fixation at retro-rectus plane by using redirecting suture hook procedure has good results in recurrence rate and cosmetic appearance.

Ahmed E Lasheen; Alaa N. El Sadek; Adel M Tolba; Emad Salah; Ayman F Mehanna

2011-01-01

299

Delayed-onset endophthalmitis associated with corneal suture infections.  

UK PubMed Central (United Kingdom)

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

Henry CR; Flynn HW Jr; Miller D; Schefler AC; Forster RK; Alfonso EC

2013-01-01

300

Polypropylene/calcium carbonate nanocomposites – effects of processing techniques and maleated polypropylene compatibiliser  

Directory of Open Access Journals (Sweden)

Full Text Available The mechanical properties and crystalline characteristics of polypropylene (PP) and nano precipitated calcium carbonate (NPCC) nanocomposites prepared via melt mixing in an internal mixer and melt extrusion in a twin screw extruder, were compared. The effect of maleic anhydride grafted PP (PP-g-MAH) as a compatibiliser was also studied using the internal mixer. At low filler concentration of 5 wt%, impact strength was better for the nanocomposites produced using the internal mixer. At higher filler loading of more than 10 wt%, the extrusion technique was more effective to disperse the nanofillers resulting in better impact properties. The impact results are consistent with the observations made from Scanning Electron Microscope (SEM) morphology study. As expected, the flexural modulus of the nanocomposites increased with filler concentration regardless of the techniques utilised. At a same filler loading, there was also no significant difference in the moduli for the two techniques. The tensile strength of the mixed nanocomposites were found to be inferior to the extruded nanocomposites. Introduction of PP-g-MAH improved the impact strength, tensile strength and modulus of the mixed nanocomposites. The improvements may be attributed to better interfacial adhesion, as evident from the SEM micrographs which displayed better dispersion of the NPCC in the presence of the compatibiliser. Though NPCC particles have weak nucleating effect on the crystallization of the PP, addition of PP-g-MAH into the mixed nanocomposites has induced significant crystallization of the PP.

2010-01-01

 
 
 
 
301

Suture suspension arthroplasty technique for basal joint arthritis reconstruction.  

Science.gov (United States)

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

DelSignore, Jeanne L; Accardi, Kimberly Z

2009-12-01

302

Suture suspension arthroplasty technique for basal joint arthritis reconstruction.  

UK PubMed Central (United Kingdom)

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

DelSignore JL; Accardi KZ

2009-12-01

303

A carpal ligament substitute part 1: polyester suture.  

UK PubMed Central (United Kingdom)

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

Martin JA Jr; Wehbé MA

2013-02-01

304

Gingival response to silk, cotton, and nylon suture materials.  

UK PubMed Central (United Kingdom)

Silk, cotton, and nylon suture materials were implanted in the tunica propria of the gingiva in seven adult rhesus monkeys. The histologie study of twenty-four biopsy specimens indicated that there was neither an increase in the vascular permeability nor a leukocytic margination and migration into the tissues adjacent to the suture materials. However, there was a variable histiocytic reaction, with multinucleated cell formation. This reaction was quite intense with cotton, less intense with silk, and practically absent with nylon. The greater cellular response to cotton was probably due to its more active capacity for modifying the internal biologic medium of the gingvia.

Castelli WA; Nasjleti CE; Caffesse RE; Diaz-Perez R

1978-02-01

305

[Value of cold-knife conization without hemostatic sutures  

UK PubMed Central (United Kingdom)

Retractile scarring often occurs after conisation of the cervix uteri, concealing the new squamocolumnar junction. It has been suggested that healing quality is improved if haemostatic sutures are not used. We report here on 118 cold-knife conisations carried out without haemostatic sutures. On histological examination there were 3% microinvasive carcinomas, 87% high-grade and 10% low-grade dysplasias. The endocervical margin was positive or doubtful in 6% of cases (n = 7). Six of these patients underwent secondary procedures which produced specimens free of transformation. A new colposcopic examination was performed six months after the cone biopsy: the squamocolumnar junction was visible in 90% confirming the usefulness of the technique.

Rimailho J; Puyuelo L; Escourrou G; Hoff J

1994-01-01

306

[Hermetization of aortic sutures - the comparative analysis of methods  

UK PubMed Central (United Kingdom)

Leakage of the ascending aortic sutures after the aortic valve replacement with the use of various methods of surgical hemostasis was studied. Results of 244 operations were analyzed. Thus, aortic leakage took place in 50 (20,5%) patients. One- or two-fold sewing was successfully used in 16 (32%) cases. The rest benefited from aortic suture fixation with the use of pericardial flap. Algorythm, implying usage of the auto- or xenopericardial flap after two-fold sewing failure, enabled exclusion of repeated aorta cross-clamping, decrease of the blood loss and hemotransfusion, and, therefore, decrease of postoperative complication and lethality rates.

Tarichko IuV; Stefanov SA; Musoev TIa; Fa?bushevich AG; Baranovich VIu

2010-01-01

307

Biomechanical testing of suture-based meniscal repair devices containing ultrahigh-molecular-weight polyethylene suture: update 2011.  

UK PubMed Central (United Kingdom)

PURPOSE: To evaluate the biomechanical characteristics of recently introduced ultrahigh-molecular-weight polyethylene suture-based, self-adjusting meniscal repair devices. METHODS: Updating a prior study published in 2009, we made vertical longitudinal cuts 3 mm from the periphery in fresh-frozen adult human menisci to simulate a bucket-handle meniscus tear. Each tear was then repaired by a single repair technique in 10 meniscus specimens. Group 1 menisci were repaired with a vertical mattress suture of No. 2-0 Ethibond (Ethicon, Somerville, NJ). Group 2 menisci were repaired with a vertical mattress suture of No. 2-0 OrthoCord (DePuy Mitek, Raynham, MA). Group 3 menisci were repaired with a single OmniSpan device with No. 2-0 OrthoCord suture (DePuy Mitek). Group 4 menisci were repaired with a single Meniscal Cinch device with No. 2-0 FiberWire suture (Arthrex, Naples, FL). Group 5 menisci were repaired with a single MaxFire device inserted with the MarXmen gun (Biomet Sports Medicine, Warsaw, IN). Group 6 menisci were repaired with a Sequent device with No. 0 Hi-Fi suture (ConMed Linvatec, Largo, FL) in a "V" suture configuration. Group 7 menisci were repaired with a single FasT-Fix 360 device (Smith & Nephew Endoscopy, Andover, MA). By use of a mechanical testing machine, all samples were preloaded at 5 N and cycled 200 times between 5 and 50 N. Those specimens that survived were destructively tested at 5 mm/min. Endpoints included maximum load, displacement, stiffness, and failure mode. RESULTS: Mean failure loads were as follows: Ethibond suture, 73 N; OrthoCord suture, 88 N; OmniSpan, 88 N; Cinch, 71 N; MarXmen/MaxFire, 54 N; Sequent, 66 N; and FasT-Fix 360, 60 N. Ethibond was stronger than MarXmen/MaxFire. The mean displacement after 100 cycles was as follows: Ethibond, 2.58 mm; OrthoCord, 2.75 mm; OmniSpan, 2.51 mm; Cinch, 2.65 mm; MarXmen/MaxFire, 3.67 mm; Sequent, 3.35 mm; and FasT-Fix 360, 1.13 mm. The MarXmen/MaxFire showed greater 100-cycle displacement than Ethibond and FasT-Fix 360. No difference in stiffness existed for these devices, and failure mode varied without specific trends. CONCLUSIONS: The biomechanical properties of meniscal repairs using the OmniSpan, Cinch, Sequent, and FasT-Fix 360 devices are equivalent to suture repair techniques. However, the MarXmen/MaxFire meniscal repair device showed significantly lower failure loads and survived less cyclic loading in the human cadaveric meniscus than other tested repairs. CLINICAL RELEVANCE: Most commercially available devices for all-inside meniscal repair using ultrahigh-molecular-weight polyethylene suture provide fixation comparable to the classic vertical mattress suture repair technique in human cadaveric meniscus.

Barber FA; Herbert MA; Bava ED; Drew OR

2012-06-01

308

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

Science.gov (United States)

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

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

1969-01-01

309

Cases of difficult suture removal following the McDonald procedure.  

UK PubMed Central (United Kingdom)

Abstract We examined the clinical significance of difficult suture removal following the McDonald procedure. We examined 117 patients following the McDonald procedure with a singleton pregnancy who delivered at ? 34 weeks of gestation. Difficult suture removal was defined as when spinal anesthesia was required for suture removal. Seven patients (6.0%) were defined as involving difficult suture removal. The cervical length in the difficult-removal-group was significantly shorter than that in the easy-removal-group at suture removal (p = 0.04). If the cervical length was shorter than 20 mm, the odds ratio for difficult suture removal was 9.0 (95% CI 1.6-49, p = 0.01). The progression of cervical ripening following the McDonald suture may be associated with an increased risk of difficult suture removal.

Suzuki S

2013-10-01

310

SURGICAL SUTURE MATERIAL WITH AN ANTIMICROBIAL SURFACE AND PROCESS FOR PROVIDING AN ANTIMICROBIAL COATING ON SURGICAL SUTURE MATERIAL  

UK PubMed Central (United Kingdom)

A surgical suture material with an antimicrobial surface is described, the surface exhibiting a coating containing a) at least one fatty acid, b) octenidine dichloride and/or dequalinium chloride and c) optionally oligomeric lactic acid esters. In addition, a process for coating surgical suture material is described which is characterized by the fact that the thread material is wetted with a homogeneous methanolic solution of octenidine dichloride and/or dequalinium chloride and subsequently the methanol is evaporated, a coating forming on the thread surface.

VOGT SEBASTIAN; KUEHN KLAUS-DIETER; BUECHNER HUBERT

311

DSC Study on Polypropylene Modified with Calcium Carbonate Nanoparticles  

International Nuclear Information System (INIS)

The exposure of polypropylene containing various concentrations of calcium carbonate nanoparticles was performed in air and water. The radiolysis products of water determine different behaviour of polymer substrate. The irradiation effect induced on polymer and the contribution of nanoparticles to the scavenging of oxygenated products that were created during ? exposure were investigated by DSC measurements over the temperature range from 340-400 K, the usual temperatures for thermal overcharge. Two kinds of carbonate particles, one type is represented by unmodified filler, while the second type is the superficially modified with stearic acid. The covering of particle surface with stearic acid confers to them a different ability in the abstraction of degradation products formed in irradiated isotactic polypropylene

2006-01-01

312

Transvaginal cervicoisthmic cerclage using a polypropylene sling: pregnancy outcome.  

UK PubMed Central (United Kingdom)

AIM: To report pregnancy outcome following prophylactic transvaginal cervicoisthmic cerclage using a polypropylene sling in a population of high-risk pregnant women. MATERIALS AND METHODS: A retrospective study with a continuous series of 57 women presenting with prior failure of McDonald cerclage (n = 47) and/or absent portio-vaginalis of the cervix (n = 10). RESULTS: Cervicoisthmic cerclage was performed between 12 and 16 weeks of gestation (median 14 weeks' gestation). No intraoperative complication occurred. Preterm labor treated with parenteral tocolysis occurred in 14 women (24%). Cesarean delivery was systematically performed. Median gestational age at delivery was 37.2 weeks' gestation (interquartile range: 36.5-38.0). Overall neonatal survival rate was 94%. CONCLUSION: Transvaginal cervicoisthmic cerclage using a polypropylene sling may be considered as an effective alternative to the transabdominal cervicoisthmic cerclage in women presenting with previous cerclage failure.

Deffieux X; Faivre E; Senat MV; Gervaise A; Fernandez H

2011-10-01

313

Mechanical properties of rubberwood fibers polypropylene epoxidized natural rubber composites  

International Nuclear Information System (INIS)

Research on rubberwood fibers-thermoplastic composites have been carried out by several workers in the past several years. The main focus was to enhance the properties of the resultant composites in view of the incompatibility of the two components. Thus, efforts have been made to enhance their properties by using coupling agents, treating the fibers and modifying the matrices. In this study, the rubberwood polypropylene composite was used as a base material and the addition of epoxidized natural rubber (ENR) is to provide a damping property of the composite with the final aim to produce a sound and noise proofing products. Initially, the processing and compositions of rubberwood fibers and polypropylene was optimized at the 50:50 w/w ratio using melt blend internal mixer. The processing parameters were established. Subsequently, the mechanical properties of the composites were determined with addition of 1-4% of ENR. (Author)

2004-01-01

314

Destructive tests on low voltage metallized polypropylene capacitors  

Energy Technology Data Exchange (ETDEWEB)

This paper gives the results of destructive tests conducted on low voltage capacitors with metallized polypropylene dielectrics of the dry and impregnated types. The purpose of the tests was to check the behaviour of capacitors of the self-healing type in the event of a dielectric failure. A failure in the self-healing process of metallized polypropylene capacitors is usually accompanied by an increase in inside pressure which can cause the explosion in the casing if the capacitor is not equipped with a proper safety device. The tests were performed in accordance with ENEL (Italian Electricity Board) specifications. The effects of different test parameters, such as dielectric temperature and short-circuit current, were investigated and the results of the experiments were compared with those obtained in service and during service life tests.

Cesari, S.

1988-08-01

315

Functionalization of silica nanoparticles for polypropylene nanocomposites applications  

International Nuclear Information System (INIS)

Synthetic silica nanospheres of different diameters produced via the sol-gel method were used in order to enhance the barrier properties of the polypropylene-silica nanocomposites. Modification of the silica surface by reaction with organic chlorosilanes was performed in order to improve the particles interaction with the polypropylene matrix and its dispersion. Unmodified and modified silica nanoparticles were characterized using electronic microscopy (TEM), elemental analysis, thermo gravimetric analysis (TGA), and solid state nuclear magnetic resonance (NMR) spectroscopy. Preliminary permeability tests of the polymer-silica nanocomposite films showed no significant change at low particles load (3 wt%) regardless its size or surface functionality, mainly because of the low aspect ratio of the silica nanospheres. However, it is expected that at a higher concentration of silica particles differences will be observed. (author)

2011-01-01

316

Reinforced polypropylene composites: effects of chemical compositions and particle size.  

UK PubMed Central (United Kingdom)

In this work, the effects of wood species, particle sizes and hot-water treatment on some physical and mechanical properties of wood-plastic composites were studied. Composites of thermoplastic reinforced with oak (Quercus castaneifolia) and pine (Pinus eldarica) wood were prepared. Polypropylene (PP) and maleic anhydride grafted polypropylene (MAPP) were used as the polymer matrix and coupling agent, respectively. The results showed that pine fiber had significant effect on the mechanical properties considered in this study. This effect is explained by the higher fiber length and aspect ratio of pine compared to the oak fiber. The hot-water treated (extractive-free) samples, in both wood species, improved the tensile, flexural and impact properties, but increased the water absorption for 24h. This work clearly showed that lignocellulosic materials in both forms of fiber and flour could be effectively used as reinforcing elements in PP matrix. Furthermore, extractives have marked effects on the mechanical and physical properties.

Ashori A; Nourbakhsh A

2010-04-01

317

Oxygen barrier property of polypropylene-polyether treated clay nanocomposite  

Directory of Open Access Journals (Sweden)

Full Text Available Polypropylene (PP) nanocomposites were obtained by solution blending of polyether treated montmorillonite and PP, with a coupling agent of maleic anhydride grafted polypropylene (PP-g-MA). The composition of the inorganic clay was varied in 1, 2 and 5 phr (parts of clay per hundred of PP by mass) while films of the composites were obtained via compression molding. Wide-angle X-ray scattering (WAXS) showed nanocomposites in which silicate layers were exfoliated and intercalated with respect to the different clay ratios. The morphology and gas permeability of hybrids prepared with organoclay were compared. Morphological studies using transmission electron microscopy showed most clay layers were dispersed uniformly in the PP matrix. Some tactoids of agglomerated nanoparticles were detected, as clay content increased. The oxygen permeability for all the hybrids for clay loadings were reduced by 30% of the corresponding values for pure PP.

2008-01-01

318

Comparative testing by cyclic loading of rotator cuff suture anchors containing multiple high-strength sutures.  

UK PubMed Central (United Kingdom)

PURPOSE: To compare isolated medial-row with isolated lateral-row anchor performance by use of cyclic loading followed by destructive testing in an in vitro cadaveric model. METHODS: Using 16 human cadaveric humeri without tendons, we rotated 4 medial-row (Bio-Corkscrew FT [Arthrex, Naples FL], CrossFT PK [ConMed Linvatec, Largo, FL], TwinFix PK FT [Smith & Nephew Endoscopy, Andover, MA], and Healix PK [DePuy Mitek, Raynham, MA]) and 4 lateral-row (PopLok PK [ConMed Linvatec], PEEK [polyetheretherketone] PushLock [Arthrex], Footprint PEEK [Smith & Nephew Endoscopy], and Versalok [DePuy Mitek]) anchors among different medial (articular cartilage edge) and lateral greater tuberosity sites (anterior, central, posterior). All medial anchors were inserted into the humeral head at an angle no greater than 45 degrees . All lateral anchors were inserted "over the top," nearly planar to the superior humeral surface. After preloading, the constructs were cycled 500 times from 10 to 60 N at 1 Hz with the loads applied to the accompanying sutures. Those constructs surviving cycling were destructively tested. Cyclic displacement, ultimate load, and failure mode were recorded. RESULTS: In this laboratory setting, most displacement occurred in the first 100 cycles except for the Footprint anchor. Lateral-row anchors had greater mean displacements (2.6 mm) than medial-row anchors (1.2 mm) at 100 cycles and between 100 and 500 cycles (1.8 mm v 0.75 mm). Lateral-row anchors also had more total displacement (4.4 mm) than medial-row anchors (1.9 mm). A 5-mm displacement gap, defined as failure, was not seen in the Bio-Corkscrew FT, TwinFix PK FT, and Versalok anchors. Ultimate failure loads ranged from 163 N (Footprint) to 308 N (Versalok) (P < .05). The principal failure mode was anchor pullout, followed by eyelet breakage. Medial-row eyelet failures only occurred after 500 cycles at loads higher than each anchor's mean failure load. Eyelet failure for lateral-row anchors occurred before 500 cycles and at failure loads lower than each anchor's mean. CONCLUSIONS: Lateral row anchors benefit from medial row anchors for their security, and because of design differences demonstrate more displacement. When lateral-row anchors fail at the eyelet, it is at lower failure loads, while if medial-row anchors fail at the eyelet, it is at higher loads. CLINICAL RELEVANCE: Anchors designed to function as lateral-row fixation provide fixation strength inferior to that of medial-row anchors and are more likely to be subject to suture slippage.

Barber FA; Hapa O; Bynum JA

2010-09-01

319

LASER CUTTING SYSTEM AND METHODS FOR CREATING SELF-RETAINING SUTURES  

UK PubMed Central (United Kingdom)

A laser-machining system and method is disclosed for forming retainers on a suture thread. The laser system is preferably a femtosecond laser system which is capable of creating submicron features on the suture thread while preserving strength of the suture thread. The laser-machining system enables creation of retainers and self-retaining suture systems in configurations which are difficult and/or impossible to achieve using mechanical cutting technology.

GROSS JEFFREY M; D AGOSTINO WILLIAM L; DRUBETSKY LEV; NAIMAGON ALEXANDER; CONNER JACOB D; WHITWORTH KEVIN R; WOOLSEY RYAN T; DICKEY FRED M

320

Melt rheological properties of nickel powder filled polypropylene composites  

Energy Technology Data Exchange (ETDEWEB)

The melt rheological properties of nickel powder filled polypropylene composites were investigated. The effect of filler concentration on shear stress-shear rate data, melt viscosity, and melt elasticity parameters were determined by using a capillary rheometer. The study shows that the materials follow a power law in viscous behavior over the entire range of shear rates investigated and that the viscosity increases and elasticity decreases as filler concentration is increased up to a critical value. 18 references.

Maiti, S.N.; Mahapatro, P.K.

1988-08-01

 
 
 
 
321

Modification of bentonite clay and application on polypropylene nano composites  

International Nuclear Information System (INIS)

[en] This work consisted on the modification of Brasgel PA clay with ionic surfactant Praepagen WB and its incorporation into polypropylene. The results of infrared and DR-X was showed that the intercalation of surfactant in the clay and the incorporation of organoclay in PP matrix resulted in the formation of an intercalated structure. The impact strength of PP increased with the incorporation of organoclay. (author)

2009-01-01

322

Morphology-mechanical Property Relationship of Polypropylene/starch Blends  

Digital Repository Infrastructure Vision for European Research (DRIVER)

The influence of morphology on mechanical property of several polypropylene/starch (PP/starch) blends of varying compositions was studied. The blends prepared were at wt%PP/wt%starch of 97.5/2.5, 95/5, 92.5/7.7, 90/10, 87.5/12.5 and 85/15. The morphology of the blends observed, using scanning electr...

C. H. Azhari; S. F. Wong

323

Fatigue mechanisms in unidirectional glass-fibre-reinforced polypropylene  

DEFF Research Database (Denmark)

Polypropylene (PP) and polypropylene modified with maleic anhydride (MA-PP) reinforced by continuous longitudinal glass fibres have been investigated. The most prominent effect of the modification with maleic anhydride in the composite is a stronger fibre/matrix interface. The effects of interfacial strength on fatigue performance and on the underlying micromechanisms have been studied for these composite systems. Tension-tension fatigue tests (R = 0.1) were carried out on 0 degrees glass-fibre/PP and glass-fibre/ MA-PP coupons. The macroscopic fatigue behaviour was characterized in terms of stiffness reduction and fatigue-life curves. The results showed that the longitudinal Young's modulus degraded more rapidly for glass-fibre/PP, which was caused by a higher degree of damage growth and accumulation. The improvement in monotonic strength was negligible, but the fatigue life was prolonged by about one decade for the composite with the stronger interface by use of the maleic-anhydride grafted polypropylene matrix. During the fatigue testing, the microscopic mechanisms were monitored intermittently by a surface replication technique. From microscopic observations, it could be concluded that the better fatigue resistance of glass-fibre/MA-PP can be attributed to the greater interfacial strength and the resistance to debond propagation. (C) 1999 Published by Elsevier Science Ltd. All rights reserved.

Gamstedt, E.K.; Berglund, L.A.

1999-01-01

324

Rheological study of polypropylene irradiated with polyfunctional monomers  

International Nuclear Information System (INIS)

The aim of this paper is to investigate the rheological properties of polypropylene (PP) modified by ionization radiation (gamma rays) in the presence of two different monomers. The samples were mixed in a twin-screw extruder with ethylene glycol dimethacrylate (EGDMA) or trimethylolpropane trimethacrylate (TMPTMA) with concentration in the range of 0.5-5.0 mmol. After that, they were irradiated with 20 kGy dose of gamma radiation. The structural modification of polypropylene was analyzed in the melt state by measuring melt flow rate (MFR), ?* (complex viscosity) and G' (storage modulus) in the angular frequency range of 10-1 to 3 x 102 rad s-1. From the oscillatory rheology data, one could obtain the values of ?0 (zero shear viscosity) that would be related to the molar mass. All results were discussed with respect to the crosslinking and degradation process that occur in the post-reactor treatment to produce controlled rheology polypropylene. The resulting polymeric materials were submitted the cytotoxicity in vitro test by neutral red uptake methodology with NCTC L 929 cell line from American Type Culture Collection bank. All modified PP samples presented no cytotoxicity.

2007-01-01

325

Mixing of Isotactic and Syndiotactic Polypropylenes in the Melt  

Energy Technology Data Exchange (ETDEWEB)

The miscibility of polypropylene (PP) melts in which the chains differ only in stereochemical composition has been investigated by two different procedures. One approach used detailed local information from a Monte Carlo simulation of a single chain, and the other approach takes this information from a rotational isomeric state model devised decades ago, for another purpose. The first approach uses PRISM theory to deduce the intermolecular packing in the polymer blend, while the second approach uses a Monte Carlo simulation of a coarse-grained representation of independent chains, expressed on a high-coordination lattice. Both approaches find a positive energy change upon mixing isotactic PP (iPP) and syndiotactic polypropylene (sPP) chains in the melt. This conclusion is qualitatively consistent with observations published recently by Muelhaupt and coworkers. The size of the energy chain on mixing is smaller in the MC/PRISM approach than in the RIS/MC simulation, with the smaller energy change being in better agreement with the experiment. The RIS/MC simulation finds no demixing for iPP and atactic polypropylene (aPP) in the melt, consistent with several experimental observations in the literature. The demixing of the iPP/sPP blend may arise from attractive interactions in the sPP melt that are disrupted when the sPP chains are diluted with aPP or iPP chains.

CLANCY,THOMAS C.; PUTZ,MATHIAS; WEINHOLD,JEFFREY D.; CURRO,JOHN G.; MATTICE,WAYNE L.

2000-07-14

326

Rheological study of polypropylene irradiated with polyfunctional monomers  

Energy Technology Data Exchange (ETDEWEB)

The aim of this paper is to investigate the rheological properties of polypropylene (PP) modified by ionization radiation (gamma rays) in the presence of two different monomers. The samples were mixed in a twin-screw extruder with ethylene glycol dimethacrylate (EGDMA) or trimethylolpropane trimethacrylate (TMPTMA) with concentration in the range of 0.5-5.0 mmol. After that, they were irradiated with 20 kGy dose of gamma radiation. The structural modification of polypropylene was analyzed in the melt state by measuring melt flow rate (MFR), {eta}* (complex viscosity) and G' (storage modulus) in the angular frequency range of 10{sup -1} to 3 x 10{sup 2} rad s{sup -1}. From the oscillatory rheology data, one could obtain the values of {eta}{sub 0} (zero shear viscosity) that would be related to the molar mass. All results were discussed with respect to the crosslinking and degradation process that occur in the post-reactor treatment to produce controlled rheology polypropylene. The resulting polymeric materials were submitted the cytotoxicity in vitro test by neutral red uptake methodology with NCTC L 929 cell line from American Type Culture Collection bank. All modified PP samples presented no cytotoxicity.

Otaguro, H.; Rogero, S.O.; Yoshiga, A.; Lima, L.F.C.P.; Parra, D.F. [IPEN/CNEN - Instituto de Pesquisas Energeticas e Nucleares, Av. Professor Lineu Prestes, 2242, CEP 05508-000 - Cidade Universitaria, Sao Paulo, SP (Brazil); Artel, B.W.H. [EMBRARAD - Empresa Brasileira de Radiacoes Ltda, Av. Cruzada Bandeirante, 269, CEP 06705-140 - Cotia (Brazil); Lugao, A.B. [IPEN/CNEN - Instituto de Pesquisas Energeticas e Nucleares, Av. Professor Lineu Prestes, 2242, CEP 05508-000 - Cidade Universitaria, Sao Paulo, SP (Brazil)], E-mail: ablugao@ipen.br

2007-12-15

327

Study of gel formation in polypropylene modified by gamma irradiation  

International Nuclear Information System (INIS)

The linearity of the chains of iPP (isotactic polypropylene) confers to this, low melt strength. This fact limits the use of iPP in processes that demand high stretching. The graft of branches confers improvements in its extensional viscosity, resulting in Polypropylene with High Melt Strength (HMS-PP). Preparation process of the HMS-PP, included iPP in pellets, conditioned in plastic container containing acetylene under pressure of 110 kPa and radiation with ? source of 60Co in the doses of 5, 12.5 and 20 kGy. The gel fraction of the samples was determined by the extraction of soluble components in xylene under boiling for 12 hours at 138 deg C. The soluble part of the samples was decanted with the total volatilization of the xylene to the room temperature (25 deg C) and deposition in glass blades. These samples had been characterized by Optic Microscopy, Scanning Electron Microscopy and Infrared Spectroscopy. In this study of the morphology, we obtained the formation of gel and microgel of polypropylene with higher incidence in HMS-PP 20 kGy. (author)

2010-01-01

328

Contact angle analysis of corona treated polypropylene films  

Science.gov (United States)

In this work, the effect of the surface modification of polypropylene films via corona treatment was investigated. Polypropylene films were treated with negative and positive corona discharge, at atmospheric pressure, for 5 minutes, at two different temperatures - 25 °C and 90 °C. The changes in the surface free energy were investigated by means of contact angle measurements. The Bickerman's method was applied to determine the polar and dispersion components of the polymer surface free energy, on the basis of the theory of Owens, Wendt, Kaelble and Uy. Atomic force microscopy was used to analyze the polymer surface morphology changes of the films with temperature. According to the findings, in all cases the corona treatment increases the surface free energy of polypropylene films and its polar part, in comparison with the untreated samples. The effects of negative and positive corona polarities display some specific features which could be associated with different charged group introduced onto the film surface during the corona treatment. The total final effect depends on the simultaneous action of the two competing factors - temperature and corona polarity. The most pronounced effect was observed for high temperature negative corona treatment.

Vlaeva, I.; Yovcheva, T.; Viraneva, A.; Kitova, S.; Exner, G.; Guzhova, A.; Galikhanov, M.

2012-12-01

329

Study of polypropylene/polybutene blends submitted to ionizing radiation  

International Nuclear Information System (INIS)

PP has been used in various applications instead of polyvinylchloride, polyurethane or polyethylene. However, PP as linear polymer exhibits low melt strength. One of the effective approaches to achieve high melt strength is to add chain branches onto backbone species using gamma radiation. Branching and grafting result from the macroradicals combinations during irradiation process. Crosslinking and main chain scission in the polymer structure are also obtained during this process. In this paper the gamma radiation technique was used to induce chemical changes in polypropylene/polybutene blends with an acetylene atmosphere. Acetylene was injected into polyethylene bags with polypropylene/polybutene blends. These samples were irradiated with a 60Co source from Embrarad, at doses of 12,5 and 20 kGy. The crosslinking of polymer was studied by measuring gel content and changes in the rheological properties of theses samples were observed as a function of melt strength and drawability obtained with a Rheotens apparatus and of melt index measurements. The polypropylene/polybutene blends showed a remarkable increase at drawability. (author)

2005-09-02

330

Assessment of colorectal cancer incidence among polypropylene pilot plant employees  

Energy Technology Data Exchange (ETDEWEB)

Our recent study reported a colorectal cancer excess among workers involved in the manufacture of polypropylene. To follow up on this finding, we initiated a study of colorectal cancer incidence among polypropylene pilot plant workers within the same company. The purpose of this investigation was to determine whether colorectal cancer incidence was elevated among workers who may have had exposures similar to those experienced on the commercial production unit. The study population included 183 employees who worked at least 6 months on either of two pilot plants. Overall, there were three observed colorectal cases v. 3.3 expected (standardized incidence ratio = 0.9, 90% confidence interval 0.3 to 2.3). Analyses for the process, mechanic, and laboratory subgroup showed rates consistent with expected values (3 observed, 2.8 expected; standardized incidence ratio = 1.1, 90% confidence interval 0.3 to 2.8). Analyses by duration of employment and latency did not show patterns consistent with the colorectal cancer excess previously reported. The likelihood of lower or different exposures on the pilot plant than would be found on commercial production units is discussed along with the need for studies of workers in other polypropylene manufacturing environments.

Acquavella, J.F.; Owen, C.V. (Exxon Biomedical Sciences, Inc., East Millstone, NJ (USA))

1990-02-01

331

The Effect of Anchoring Sutures on Medicinal Leech Mortality  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Objective: The implementation of leech therapy for surgical flaps is not always logistically easy or comfortable for patients or healthcare providers. We examine different methods of placing sutures in the medicinal leech, Hirudo medicinalis, to make the implementation of leech therapy easier. Metho...

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

332

Suture Retention Strength of Expanded Polytetrafluoroethylene (ePTFE) Graft  

Digital Repository Infrastructure Vision for European Research (DRIVER)

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 anastomot...

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

333

Novel use of Prolene suture for duct delineation during microductectomy  

Directory of Open Access Journals (Sweden)

Full Text Available Classically, microductectomy is performed using a probe inserted via the offending duct to delineate and identify the responsible duct. We propose the use of a 1-0 Prolene (Polypropene blue monofilament nonabsorbable) suture to cannulate the relevant duct.

Shiva Dindyal; Jayant Sharad Vaidya

2011-01-01

334

Microbiological Evaluation of Suture Items Before Radiation Sterilization  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Microbiological contamination levels of suture samples taken at various stages of the manufacturing process in a new hygienically controlled plant were determined by employing a membrane filturation technique. Both raw material and materials handled manually in the production process were tested to ...

Österberg, Bertil O.

335

Penile torsion correction by diagonal corporal plication sutures  

Directory of Open Access Journals (Sweden)

Full Text Available Penile torsion is commonly encountered. It can be caused by skin and dartos adherence or Buck’s fascia attachments. The authors suggest a new surgical approach to solve both problems. If Buck’s fascia involvement is demonstrated by artificial erection then a new diagonal corporal plication suture is described to effectively solve this problem.

Brent W. Snow

2009-01-01

336

Penile torsion correction by diagonal corporal plication sutures  

Scientific Electronic Library Online (English)

Full Text Available Abstract in english Penile torsion is commonly encountered. It can be caused by skin and dartos adherence or Buck’s fascia attachments. The authors suggest a new surgical approach to solve both problems. If Buck’s fascia involvement is demonstrated by artificial erection then a new diagonal corporal plication suture is described to effectively solve this problem.

Snow, Brent W.

2009-02-01

337

Suture supported P C IOL in a homocystinuric child.  

Directory of Open Access Journals (Sweden)

Full Text Available A homocystinuric child presented with a secondary pupillary block glaucoma due to anteriorly subluxated lens. After removal of the subluxated lens, a suture supported posterior chamber IOL was implanted. Postoperative complication of cerebral venous thrombosis following general anaesthesia was managed with high doses of pyridoxine special diet and drugs.

Bhatti S; Agashe A; Jehangir R

1996-01-01

338

Healing of the suture line in the irradiated small intestine  

International Nuclear Information System (INIS)

With the help of data from literature the author goes more deeply into the aetiology, treatment and possible prevention of lesions of the small intestine related to preceding irradiation. In a clinical retrospective study at twenty patients who, after irradiation of the abdominal and pelvic areas, have been submitted to abdominal surgery, the relation is studied between predistion factors for gastrointestinal complications after irradiation, the surgeries applied in case of small-intestine problems and postoperative complications. The third part of the thesis covers an experimental part in which the healing process of suture line in the terminal ileum has been studied after resection and reanastomosis in previously irradiated bowel of the rat. It was investigated whether differences occurred in the healing process of suture line after various periods - 4, 10 and 40 weeks, after irradiation. Also comparison took place with a control group which underwent a similar procedure with the exception of the radiation treatment, which was simulated in this group. In a second experiment it was investigated if the healing process of suture line depends on the type of anastomosis. An end-to-end anastomosis was chosen versus side-to-side anastomosis. Also in this experiment an irradiated group was compared with a control group. Furthermore a method was developed for performing micro-angiographies of the rat intestine in order to demonstrate obliteration of blood vessels in irradiated intestine and to assess neovascularization in the intestinal wall at the suture line. (author). 84 refs.; 18 figs.; 27 tabs

1989-01-01

339

LAPAROSCOPIC METHOD FOR SUTURING IN A BODY CAVITY  

UK PubMed Central (United Kingdom)

The present embodiments relate to a laparoscopic method for suturing in a patient, namely by pushing at least one throw of a knot into a body cavity in a manner that is quick and easier on the patient, particularly lap band patients.

WILKENFELD RICHARD S; WILKENFELD RHODA

340

Sutureless skin closure for pacemaker implantation: comparison with subcuticular suture.  

Digital Repository Infrastructure Vision for European Research (DRIVER)

In 51 patients undergoing pacemaker implantation a trial was carried out to compare the results of sutureless skin closure using a new product (Op-Site skin closures) with skin closure using a continuous subcuticular absorbable (Dexon) suture. Incisions closed with Op-Site skin closures healed as we...

Pitcher, D.

 
 
 
 
341

SUTURE NON-SUTSRE CIRCUMFERENTIAL REPAIR OF CAROTID ARTERY  

Digital Repository Infrastructure Vision for European Research (DRIVER)

plastic adhesives, normal butyl cyanoacrylate monomer, isobutyl cyanoacrylate monomer and methyl 2 _ cyaooacrylate monomer, have been utilized in a comparative study with 5-{) silk suture in the repair of transected carotid arteries. Follow _ up arteriog ramS indicate isobutyl cyanoacrylate monomer ...

Jafar Nader

342

Obliteration of serrated sutures of a human skull (review)  

Directory of Open Access Journals (Sweden)

Full Text Available The review presents information on obliteration of serrated sutures of a human skull. It considers the age-specific variability and sexual dimorphism. The causes of craniostenosis and dependence of cranial form on degree and type of craniostenosis are described

Zaichenko A.A.; Kochenkova ?.V.; Anisimova ?.?.; Anisimov D.I.; Lukin ?.Yu.

2011-01-01

343

Investigation on dyeability of polypropylene fabrics grafted with chitosan after plasma modification  

Science.gov (United States)

In this study, the properties of polypropylene fabrics grafted with chitosan after being activated by low temperature plasmas were evaluated. The chitosan was applied to polypropylene fabrics by using pad-dry cure technique. The surface morphology was characterized by SEM images. Treated samples were characterized by means of Fourier transform infrared (FTIR) spectroscopy. The polypropylene fabric treated with chitosan demonstrates an excellent dyeability property.

Shahidi, Sheila; Moazzenchi, Bahareh; Ghoranneviss, Mahmood; Azizi, Samar

2013-04-01

344

The role of micrometric wollastonite particles on stress whitening behavior of polypropylene composites  

International Nuclear Information System (INIS)

The micromechanism and susceptibility to stress whitening during tensile straining of micrometric wollastonite mineral-reinforced polypropylenes is studied by electron microscopy and compared with unreinforced neat polypropylenes. Mineral-reinforced polypropylene composite exhibit significantly reduced susceptibility to stress whitening, and are characterized by lower gray level in the plastically deformed stress whitened zone. This behavior is attributed to the effective reinforcement of polypropylene by wollastonite that acts in concert increasing the tensile modulus of the composite and restricts plastic deformation of the matrix. The increase in tensile modulus is explained in terms of a three-phase model involving matrix, particle, and interface zone. Furthermore, isothermal crystallization indicated that the reinforcement mineral increases the rate of nucleation with consequent increase in % bulk crystallinity. The reinforcement of polypropylene alters the primary micromechanism of stress whitening from deformation bands/crazing in neat polypropylenes to wedge/ridge-tearing in mineral-reinforced polypropylene composites. The final fracture in reinforced polypropylene occurs by a mixed mode consisting of fibrillation and brittle mode, while crazing-tearing and brittle deformation are fracture modes for neat polypropylene.

2004-04-05

345

Effect of ?-irradiation on the structure, stability and transport properties of polypropylene membrane and Cyanex-301  

International Nuclear Information System (INIS)

[en] Polypropylene supported liquid membrane of Cyanex-301 was found to be promising for the separation of trivalent actinides and lanthanides. It is therefore important to study the effect of gamma radiation on the transport behaviour of polypropylene supported liquid membrane containing Cyanex-301 as carrier. In the present work polypropylene flatsheet and Cyanex-301 solution in dodecane were irradiated separately by gamma irradiation. The transport behavior of the SLM of the irradiated polypropylene flatsheets were correlated with its change in pore structure observed by scanning electron microscopy. (author)

2007-01-01

346

Vaginal Vault Closure Techniques in total Laparoscopic Hysterectomy: A Comparison between Laparoscopic Route Vault Suturing and Vaginal Route Suturing  

Directory of Open Access Journals (Sweden)

Full Text Available Objective: To study and compare the two approaches for vaginal vault closure in patients undergoing total laparoscopic hysterectomy. Material and methods: A comparative study was undertaken in 70 patients who underwent total laparoscopic hysterectomy for benign gynaecological disorders in Kesar SAL medical college, Ahmedabad. In half of the patients, vault closure was done through laparoscopic route and in the other half it was done through vaginal route. Results: The group who underwent vaginal vault suturing by laparoscopic route, the mean operative time was 77.0 ( +6.4 SD, range 70-94 ) minutes as compared to the group in which vaginal vault were sutured through vaginal route (88.5 minutes with a SD +4.9, range 80 - 100), the observed difference was statically significant (p <0.00). The post operative vaginal length was better preserved in laparoscopic suturing (8.4 cm with a SD of +0.4, range 8.5 - 10) as compared to vaginal suturing (7.34 cm with a SD of + 0.4, range 7.5 – 9.2) and difference was statically significant (p <0.00). Post operative complications were also statically significantly lower in the laparoscopic route vault closure(28.5%) as compared to vaginal route vault closure(88.5%) and difference was statically significant (Z= 6.42, p < 0.000). Conclusion: laparoscopic route vault closure was less time consuming and comparatively safer than vaginal route vault closure.

Kanupriya Singh, Bhavit Shah, Vipul Patel, Mihir Goswami, M B Shah

2011-01-01

347

Development of novel melt-compounded starch-grafted polypropylene/polypropylene-grafted maleic anhydride/organoclay ternary hybrids  

Directory of Open Access Journals (Sweden)

Full Text Available Starch-grafted polypropylene (PP-g-starch)/organoclay nanocomposites were melt-compounded using a corotating twin-screw extruder. Homopolymer or copolymer-based polypropylene-grafted maleic anhydrides (PP-g-MA) with different molecular weights and different maleic anhydride (MA) grafting levels were added at different weight contents as compatibilizer. Two organo-modified montmorillonites were used, the first one containing polar functional groups (Cloisite®30B) having affinity to the starch phase, and the other one containing non polar-groups (Cloisite®20A) having affinity to the polypropylene phase of the polymer matrix. Whatever the MA grafting level and the molecular weight and content of PP-g-MA, no significant immiscibility of PP-g-starch/PP-g-MA blends is evidenced. Regarding clay dispersion, adding a low content of ethylene-propylene copolymer-based PP-g-MA compatibilizer having a high MA-grafting level, and a polar organoclay (Cloisite®30B) is the most desirable formulation to optimize clay intercalation and exfoliation in PP-g-starch. Nevertheless, regarding the reinforcement effect, whatever the PP-g-MA compatibilizer, the addition of non polar organoclay (Cloisite®20A) is preferably recommended to reach higher tensile properties (modulus, yield stress, strength) without significant loss of ductility.

E. Lafranche; R. Tessier; P. Krawczak

2012-01-01

348

Biomechanical analysis of suture anchors and suture materials used for toggle pin stabilization of hip joint luxation in dogs.  

UK PubMed Central (United Kingdom)

OBJECTIVE: To compare in vitro mechanical properties of toggle pins and toggle rods used as suture anchors and of 3 suture materials (50-lb monofilament polybutester, No. 5 braided polyester, and 5-mm woven polyester) commonly used as prosthetic ligaments in the repair of hip joint luxation in dogs. SAMPLE POPULATION: Femoropelvic specimens from the cadavers of 18 dogs. PROCEDURE: Suture anchors were compared by use of pullout tests. Suture materials were compared by use of monotonic and cyclic tensile tests; cyclic tensile tests were performed with the suture placed over the edge of an aluminum bar to simulate the edge of the femoral bone tunnel. In vitro mechanical properties of the ligament of the femoral head were determined by use of monotonic tensile tests, using bone-ligament-bone cadaveric specimens. The in vitro mechanical properties of the acetabulum-ligament-femur complex and of this complex following rupture of the ligament and stabilization with a toggle rod and 5-mm woven polyester were determined by use of compression tests that simulated weight-bearing. RESULTS: Mechanical properties of the toggle rod were not significantly different from those of the toggle pin. Woven polyester had the longest fatigue life in cyclic testing. Hip joints stabilized with a toggle rod and woven polyester had less than half the strength in vitro of intact joints. CONCLUSIONS AND CLINICAL RELEVANCE: Results suggested that a toggle rod or toggle pin can be used for stabilization of hip joint luxations in dogs. Of the materials tested, braided polyester had the best in vitro mechanical properties.

Baltzer WI; Schulz KS; Stover SM; Taylor KT; Kass PH

2001-05-01

349

Recombinant human bone morphogenetic protein-2 stimulates bone formation during interfrontal suture expansion in rabbits.  

UK PubMed Central (United Kingdom)

INTRODUCTION: Suture expansion stimulates bone growth to correct craniofacial deficiencies but has a high potential of treatment relapse. The objective of this study was to investigate whether there is a dose-dependent relationship between the recombinant human bone morphogenetic protein-2 (rhBMP-2) and bone formation during suture expansion. METHODS: Fifty 6-week-old male New Zealand white rabbits were randomly assigned to 5 groups to receive 0 (control), 0.01, 0.025, 0.1, or 0.4 mg/mL of rhBMP-2 delivered by absorbable collagen sponge placed over the interfrontal suture. The suture was expanded for 33 days by 200 g of constant force via a spring anchored with 2 miniscrew implants. Distance of suture expansion, suture volume, and cross-sectional area after expansion were measured using radiographs with bone markers and microcomputed tomography. Suture widths and mineralization appositional rates were calculated based on the widths between bone labels under an epifluorescent microscope. Software (Multilevel Win 2.0; University of Bristol, Bristol, United Kingdom) was used to model distance of suture expansion over time as polynomials to compare group differences. Wilcoxon signed rank tests were performed to compare the suture volume and cross-sectional area, mineral apposition rate, and suture width between groups. The significance level was set at P = 0.05. RESULTS: Whereas the sutures were expanded in all groups, sutures were expanded by significantly greater amounts in the control and the 0.01 mg/mL groups without fusing the sutures than in the 0.025, 0.1, and 0.4 mg/mL groups with fusing sutures. Compared with the controls, the 0.01 mg/mL group showed significantly lower suture volumes, cross-sectional areas, and suture widths after expansion. The mineral apposition rate was significantly higher in the 0.01 mg/mL group than in the controls from days 10 to 30. CONCLUSIONS: The 0.01 mg/mL dose of rhBMP-2 delivered by absorbable collagen sponge can stimulate bone formation at the bony edges of the suture during suture expansion; however, higher concentrations cause suture fusion. With an appropriate concentration, rhBMP-2 might facilitate suture expansion for clinical uses.

Liu SS; Xu H; Sun J; Kontogiorgos E; Whittington PR; Misner KG; Kyung HM; Buschang PH; Opperman LA

2013-08-01

350

Análise das aderências resultantes da fixação de telas cirúrgicas com selantes de fibrina e sutura: modelo experimental intraperitoneal Analysis of adhesions resulted from mesh fixation with fibrin sealant and suture: experimental intraperitoneal model  

Directory of Open Access Journals (Sweden)

Full Text Available OBJETIVO: Comparar fixação cirúrgica de telas de polipropileno (PP) e telas de polipropileno revestido (PCD), usando fio de sutura de polipropileno e cola biológica, quanto à formação de aderências intraperitoneais. MÉTODOS: Amostra de 46 ratas Wistar, randomizadas em seis grupos: dois grupos-controle, com cinco ratas cada, que foram submetidos um à incisão medial (IM) e o outro à uma incisão em forma de U (IU); nenhum desses grupos recebeu tela. Dois grupos com tela de PP, um com dez ratas, fixada com sutura (PPF), e o outro, com seis ratas, fixada com cola biológica (PPC). E Dois grupos com tela de PCD, no primeiro, com dez animais, a tela foi fixada com sutura (PCDF), e no segundo, com dez animais, com cola biológica (PCDC). RESULTADOS: Após o prazo de 21 dias, os grupos-controle não apresentaram aderências significantes. O grupo PPC apresentou menor grau de aderência do que o grupo PPF (p=0,01). Não houve diferença entre as fixações nos grupos com PCD. CONCLUSÃO: A comparação da fixação apresentou diferença estatística significativa apenas à tela de PP, com menor grau de aderência utilizando a cola. As aderências se localizaram predominantemente nas extremidades das telas estudadas.OBJECTIVE: To compare surgical fixation of polypropylene mesh (PP) and coated polypropylene mesh (PCD) using polypropylene suture and fibrin glue, as for the formation of intraperitoneal adhesions. METHODS: A sample of 46 female Wistar rats were randomized into six groups: two control groups, with five rats each, were subjected to one medial incision (MI) and the other to a U-shaped incision (UI), none of these groups received the mesh. Two groups of PP mesh, with ten rats, fixed with suture (PPF), the other with six rats, fixed with biological glue (PPC). And two groups of PCD mesh, at first, with ten animals, the mesh was fixed with sutures (PCDFs) and the second with ten animals with biological glue (PCDC). RESULTS: After 21 days, the control groups showed no significant adhesions. The PPC group showed a lower degree of adhesion than the PPF group (p = 0.01). There was no difference between the groups with PCD. CONCLUSION: Comparison of fixation was statistically different only with PP mesh, with lesser degrees of adherence when using the glue. Adhesions were predominantly located at the extremities of the meshes studied.

Juliano Hermes Maeso Montes; André Vicente Bigolin; Renata Baú; Roberto Nicola; João Vicente Machado Grossi; Cláudia Juliana Loureiro; Leandro Totti Cavazzola

2012-01-01

351

Análise das aderências resultantes da fixação de telas cirúrgicas com selantes de fibrina e sutura: modelo experimental intraperitoneal/ Analysis of adhesions resulted from mesh fixation with fibrin sealant and suture: experimental intraperitoneal model  

Scientific Electronic Library Online (English)

Full Text Available Abstract in portuguese OBJETIVO: Comparar fixação cirúrgica de telas de polipropileno (PP) e telas de polipropileno revestido (PCD), usando fio de sutura de polipropileno e cola biológica, quanto à formação de aderências intraperitoneais. MÉTODOS: Amostra de 46 ratas Wistar, randomizadas em seis grupos: dois grupos-controle, com cinco ratas cada, que foram submetidos um à incisão medial (IM) e o outro à uma incisão em forma de U (IU); nenhum desses grupos recebeu tela. Dois grupos (more) com tela de PP, um com dez ratas, fixada com sutura (PPF), e o outro, com seis ratas, fixada com cola biológica (PPC). E Dois grupos com tela de PCD, no primeiro, com dez animais, a tela foi fixada com sutura (PCDF), e no segundo, com dez animais, com cola biológica (PCDC). RESULTADOS: Após o prazo de 21 dias, os grupos-controle não apresentaram aderências significantes. O grupo PPC apresentou menor grau de aderência do que o grupo PPF (p=0,01). Não houve diferença entre as fixações nos grupos com PCD. CONCLUSÃO: A comparação da fixação apresentou diferença estatística significativa apenas à tela de PP, com menor grau de aderência utilizando a cola. As aderências se localizaram predominantemente nas extremidades das telas estudadas. Abstract in english OBJECTIVE: To compare surgical fixation of polypropylene mesh (PP) and coated polypropylene mesh (PCD) using polypropylene suture and fibrin glue, as for the formation of intraperitoneal adhesions. METHODS: A sample of 46 female Wistar rats were randomized into six groups: two control groups, with five rats each, were subjected to one medial incision (MI) and the other to a U-shaped incision (UI), none of these groups received the mesh. Two groups of PP mesh, with ten rat (more) s, fixed with suture (PPF), the other with six rats, fixed with biological glue (PPC). And two groups of PCD mesh, at first, with ten animals, the mesh was fixed with sutures (PCDFs) and the second with ten animals with biological glue (PCDC). RESULTS: After 21 days, the control groups showed no significant adhesions. The PPC group showed a lower degree of adhesion than the PPF group (p = 0.01). There was no difference between the groups with PCD. CONCLUSION: Comparison of fixation was statistically different only with PP mesh, with lesser degrees of adherence when using the glue. Adhesions were predominantly located at the extremities of the meshes studied.

Montes, Juliano Hermes Maeso; Bigolin, André Vicente; Baú, Renata; Nicola, Roberto; Grossi, João Vicente Machado; Loureiro, Cláudia Juliana; Cavazzola, Leandro Totti

2012-12-01

352

Surgical suture assembled with polymeric drug-delivery sheet for sustained, local pain relief.  

UK PubMed Central (United Kingdom)

Surgical suture is a strand of biocompatible material designed for wound closure, and therefore can be a medical device potentially suitable for local drug delivery to treat pain at the surgical site. However, the preparation methods previously introduced for drug-delivery sutures adversely influenced the mechanical strength of the suture itself - strength that is essential for successful wound closure. Thus, it is not easy to control drug delivery with sutures, and the drug-delivery surgical sutures available for clinical use are now limited to anti-infection roles. Here, we demonstrate a surgical suture enabled to provide controlled delivery of a pain-relief drug and, more importantly, we demonstrate how it can be fabricated to maintain the mechanical strength of the suture itself. For this purpose, we separately prepare a drug-delivery sheet composed of a biocompatible polymer and a pain-relief drug, which is then physically assembled with a type of surgical suture that is already in clinical use. In this way, the drug release profiles can be tailored for the period of therapeutic need by modifying only the drug-loaded polymer sheet without adversely influencing the mechanical strength of the suture. The drug-delivery sutures in this work can effectively relieve the pain at the surgical site in a sustained manner during the period of wound healing, while showing biocompatibility and mechanical properties comparable to those of the original surgical suture in clinical use.

Lee JE; Park S; Park M; Kim MH; Park CG; Lee SH; Choi SY; Kim BH; Park HJ; Park JH; Heo CY; Choy YB

2013-09-01

353

Cranial sutures work collectively to distribute strain throughout the reptile skull  

Science.gov (United States)

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

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

2013-01-01

354

Squamous suture - A rare case of asymmetrical closure with review of literature.  

UK PubMed Central (United Kingdom)

Cranial sutures give a wide estimate of age and asymmetric closure of sutures is likely to further complicate the process of age estimation from the closure of cranial sutures. Literature on the estimation of age from squamous suture is limited. A rare case of asymmetric closure of squamous suture is reported along with a review of literature. The reported case highlights on the fact that asymmetric closure of the sutures may cause inaccuracies in age estimation when only one half of the skull is available for forensic examination. Asymmetric closure of sutures may also lead to erroneous opinion on the number of individuals in cases when fragments of skull are brought for medicolegal investigation.

Kanchan T; Krishan K; Kumar GP

2013-09-01

355

Squamous suture - A rare case of asymmetrical closure with review of literature.  

Science.gov (United States)

Cranial sutures give a wide estimate of age and asymmetric closure of sutures is likely to further complicate the process of age estimation from the closure of cranial sutures. Literature on the estimation of age from squamous suture is limited. A rare case of asymmetric closure of squamous suture is reported along with a review of literature. The reported case highlights on the fact that asymmetric closure of the sutures may cause inaccuracies in age estimation when only one half of the skull is available for forensic examination. Asymmetric closure of sutures may also lead to erroneous opinion on the number of individuals in cases when fragments of skull are brought for medicolegal investigation. PMID:23688928

Kanchan, Tanuj; Krishan, Kewal; Kumar, G Pradeep

2013-05-18

356

Femoral artery infection associated with a percutaneous arterial suture device.  

UK PubMed Central (United Kingdom)

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

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

2004-05-01

357

Femoral artery infection associated with a percutaneous arterial suture device.  

Science.gov (United States)

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

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

2004-05-01

358

Time to failure of biodegradable sutures: a new approach  

International Nuclear Information System (INIS)

[en] Data on the degradation and lifetime of biodegradable polyglycolic acid (PGA) sutures has been obtained. A new creep rupture technique was used with the samples immersed in a phosphate buffer solution to simulate in vivo fluids. Two groups of sutures were studied. Since irradiation is a convenient method of sterilization, one group consisted of 30 samples irradiated at 5 and 20 Mrad. A second group of 30 unirradiated samples was tested at temperatures from 30 to 450C. Failure occurs much faster at temperatures above 360C, the glass transition temperature for PGA, and for irradiated samples, the rate increasing with dose. At temperatures above glass transition the material becomes more accessible to hydrolysis which is generally accepted as the main mechanism for PGA degradation. Irradiation causes chain scission in non-crystalline regions, the sites responsible for hydrolysis. The failure data has been analysed using the Weibull distribution. (author)

1987-01-01

359

Spatulated anastomosis with continuous suture in microreconstructive surgery.  

UK PubMed Central (United Kingdom)

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

Domergue S; Lange F; Fassio E; Yachouh J

2012-07-01

360

Patella fracture after medial patellofemoral ligament reconstruction using suture anchors.  

UK PubMed Central (United Kingdom)

The medial patellofemoral ligament (MPFL) acts as a soft tissue restraint to lateral subluxation of the patella, and is frequently damaged following patellar dislocation. A number of techniques for repair or reconstructions of the MPFL have been reported. We report two cases of patellar fracture following MPFL reconstruction utilizing suture anchors and bone tunnels that do not completely traverse the patella. The first case occurred seven months after surgery and the second case was at six weeks following surgery. There have been previous reports of patellar fracture following MPFL reconstruction, particularly when patellar tunnels completely traverse the patella. The authors decided to use suture anchors to reduce the risk of patellar fracture, and they feel that the fractures reported in this paper resulted from surgical error rather than system error. We feel that this is an important learning point when initially using this technique, and should be disseminated to other surgeons who undertake this surgery.

Dhinsa BS; Bhamra JS; James C; Dunnet W; Zahn H

2013-08-01

 
 
 
 
361

Maleic anhydride-grafted polypropylene: FTIR study of a model polymer grafted by ene-reaction  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Ene-grafting of maleic anhydride on polypropylene previously enriched in double bonds by beta-scission was promoted in order to obtain model grafted polypropylene. Ene-grafting was carried out in the presence of a radical-scavenger in order to limit at a minimum side-grafting and in presence of cata...

Sclavons, Michel; Laurent, Michèle; Devaux, Jacques; Carlier, Véronique

362

Study on the conversion of polypropylene waste to oil in a fluidized bed reactor  

Energy Technology Data Exchange (ETDEWEB)

Catalytic cracking of polypropylene waste with a lab-made catalyst in a fluidized bed reactor has been studied, the yield of liquid product is 50%, the research octane number of the gasoline produced from plastic waste is 86, and the centane index of the diesel fuel produced from plastic waste is 43. The mechanism of catalytic cracking of polypropylene waste is discussed. (author)

Ji, X.; Qian, J.L.; Wang, J.Q.

2001-02-01

363

Effect of ?-radiation on trypsin immobilized at a modified polypropylene textile material  

International Nuclear Information System (INIS)

In studying the proteolytic activity and ESR spectra of ?-irradiated samples of trypsin immobilized at an inoculated copolymer of polypropylene with polyacrylic acid it was established that the carrier of a modified polypropylene increase the radioresistances of trypsin immobilized on it.

1989-01-01

364

Conversion of atactic polypropylene waste to fuel oil. Final report  

Energy Technology Data Exchange (ETDEWEB)

A stable, convenient thermal pyrolysis process was demonstrated on a large scale pilot plant. The process successfully converted high viscosity copolymer atactic polypropylene to predominantly liquid fuels which could be burned in commercial burners. Energy yield of the process was very high - in excess of 93% including gas phase heating value. Design and operating data were obtained to permit design of a commercial size atactic conversion plant. Atactic polypropylene can be cracked at temperatures around 850/sup 0/F and residence time of 5 minutes. The viscosity of the cracked product increases with decrease in time/temperature. A majority of the pyrolysis was carried out at a pressure of 50 psig. Thermal cracking of atactic polypropylene is seen to result in sigificant coke formation (0.4% to 0.8% on a weight of feed basis) although the coke levels were of an order of magnitude lower than those obtained during catalytic cracking. The discrepancy between batch and continuous test data can be atrributed to lowered heat transfer and diffusion rates. Oxidative pyrolysis is not seen as a viable commercial alternative due to a significant amount of water formation. However, introduction of controlled quantities of oxygen at lower temperatures to affect change in feedstock viscosity could be considered. It is essential to have a complete characterization of the polymer composition and structure in order to obtain useful and duplicable data because the pyrolysis products and probably the pyrolysis kinetics are affected by introduction of abnormalities into the polymer structure during polymerization. The polymer products from continuous testing contained an olefinic content of 80% or higher. This suggests that the pyrolysis products be investigated for use as olefinic raw materials. Catalytic cracking does not seem to result in any advantage over the Thermal Cracking process in terms of reaction rates or temperature of operation.

Bhatia, J.

1981-04-01

365

Pubovaginal sling with a low-cost polypropylene mesh  

Scientific Electronic Library Online (English)

Full Text Available Abstract in english OBJECTIVE: The aim of this study was to present the results of pubovaginal sling with a low-cost polypropylene mesh in the treatment of stress urinary incontinence MATERIALS AND METHODS: 118 women diagnosed with stress urinary incontinence (SUI) due to urethral hypermobility or intrinsic sphincteric deficiency, treated with pubovaginal sling (PVS) with a low-cost polypropylene mesh confectioned by the surgeon, were analyzed. All patients had a basic evaluation that includ (more) ed a medical history, physical examination, stress tests and urodynamic investigation RESULTS: The average follow up was of 42 months. Urethral hypermobility was observed in 67% of the cases. The process was carried out on an outpatient basis on 67 patients. Intra-operative complications included 4 vesical injuries, treated with catheterization for 3 days. There were 13 early complications, of which 8 were urinary retentions treated with vesical drainage for 1 to 3 weeks and 3 vaginal extrusions of the mesh treated with covering of the sections with mucous membrane. There was a need for 6 urethrolysis in patients who presented irritative and postoperative obstructive symptoms; 81.3% of the patients were considered cured, while 9.3% had significant improvement. Three initially unsuccessful cases required sling reconfiguration. All cases were eventually cured CONCLUSION: The construction of a pubovaginal sling using a low-cost polypropylene mesh is a safe and effective technique for the relief of SUI. It should be considered an alternative, especially for patients in public health systems with low financial resources.

Rodrigues, Fransber R.; Maroccolo Filho, Romulo; Maroccolo, Roberto R.; Paiva, Lucio C.; Diaz, Fernando A.; Ribeiro, Eduardo C.

2007-10-01

366

GC-MS OF POLYETHYLENE AND POLYPROPYLENE THERMAL CRACKING PRODUCTS  

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Full Text Available Low-density polyethylene and polypropylene were thermally decomposed individually in a batch reactor at 450°C as a recycling route from the aspect of the production of petrochemical feedstock. The resulting transformation liquid products were analysed by high resolution gas chromatographic-mass spectrometric analysis. More detailed separation of polyalkenes splitting compounds was achieved using high resolution GC (efficiencies up to 490 000 plates) than before. The GC-MS as well as the dependence of homomorphy factors and isopropyl group increments on the number of carbon atoms of alk-1-enes, alk-2-enes, alka-?,?-dienes and alkanes were used for identification of separated analytes.Thermal cracking of LDPE products in the range C5-C23 were characterized by quintets of peaks in the chromatogram which were assigned to n-alkanes, alk-1-enes, (E)-alk-2-enes, (Z)-alk-2-enes and alka-?,?-dienes with average quantitative ratio 1 : 1.2 : 0.07 : 0.05 : 0.08. In fraction up to n-C8 140 GC peaks were separated and identified, including around 30 acyclic octenes.In contrast to the polyethylene thermal cracking which yields products with straight-chain hydrocarbon structure, polypropylene cracking is characterized by the formation of compounds with branched and high prevailingly unsaturated hydrocarbon structure. The pretention of this analytical problem lies in stereoisomerism and corresponding multicomponentity of branched alkenes, alkadienes and alkanes in a broad range of carbon atoms number as main decomposition products of polypropylene. In the liquid fraction up to n-C8 84 peaks including around 40 acyclic octenes were identified. Other 149 GC peaks were analysed in the C9-C25 fraction with quantitative ratio of alkane : alkene : alkadiene equal to 1 : 17 : 4. High resolution GC allowed more detailed and more reliable analysis of multicomponent polyalkenes cracking products.

Ladislav Soják; Robert Kubinec; Helena Jurdáková; Elena Hájeková; Martin Bajus

2006-01-01

367

Síntese da parede abdominal: avaliação de dois tipos de sutura contínua em ratos Abdominal wall syntheses: comparison between two types of continuous suture  

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Full Text Available OBJETIVO: Comparar a sutura simples contínua e a sutura contínua em oito vertical no fechamento da parede abdominal de ratos. MÉTODOS: Quarenta e oito ratos machos Wistar, foram submetidos a laparotomia padronizada e fechamento da parede abdominal com sutura simples contínua (n=24) e sutura contínua em oito-vertical (n=24), com fio de polipropileno. No 7° e 14° pós-operatório foram submetidos a eutanásia 12 animais de cada grupo e deles retirados a camada músculo-aponevrótica da parede abdominal envolvendo a cicatriz operatória e preparados para exames histológico e imunohistoquímico. Os segmentos levados ao exame histológico foram corados por Hematoxilina-eosina sendo feita observação qualitativa do processo cicatricial e Picrosirius red F3BA, para avaliação quantitativa do colágeno. Também foram estudadas as porcentagens de macrófagos na linha de sutura por imunohistoquímica. Para a quantificação de macrófagos e fibras colágenas foi utilizado avaliação histológica por digitalização de imagem, baseados nos princípios de espectrofotometria. Os dados encontrados foram analisados estatisticamente pelos testes qui-quadrado, exato de Fisher e Mann-Whitney (pPURPOSE: To establish morphologic relationship between the continuous "simple mass" suture and the continuous far-near, near-far mass suture of longitudinal midline abdominal incision. METHODS: A total of 48 male Wistar rats underwent longitudinal standard laparotomy with equal distribution to one of two groups: GI- continuous "simple mass" suture, GII-continuous far-near, near-far suture, both with polypropylene. On postoperative day 7th or14th, 12 animals of each group were submitted to euthanasia and anterior abdominal wall was removed (without skin) for histologic and immune- histochemistry analysis. The samples of the abdominal wall were stained by hematoxylin-eosin in order to performed a qualitative healing tissue reaction. Others samples were stained by Picrosirius red F3BA in order to performed a quantitative analysis of macrophages and collagen. Statistical analysis was done by use the chi-square test, Fisher exact test and Mann-Whitney variance test ( p< 0,05). RESULTS: The findings of the macrophages cells and the collagen evaluation were statistical significantly on day 7th. CONCLUSION:The continuous far-near, near-far technique improved the abdominal wall healing on day 7th. On day 14th the findings were the same.

Vanessa Medeiros Loureiro; Djalma José Fagundes; Murched Omar Taha

2003-01-01

368

Efficacy of b-lynch brace suture in postpartum haemorrhage  

International Nuclear Information System (INIS)

[en] Massive uncontrolled haemorrhage after childbirth is the leading cause of maternal death in developing countries. Postpartum haemorrhage is traditionally defined as blood loss of more than 500 ml after vaginal delivery and more than 1000 ml after caesarean section, but intraoperative estimation of blood loss is inaccurate. Uterine atony alone accounts for 75 - 90% of PPH. To estimate the effectiveness and safety of B-Lynch brace Suture in the management of primary postpartum haemorrhage (PPH). (author)

2011-01-01

369

[Pathogenesis of the failure of intestinal anastomosis sutures in peritonitis  

UK PubMed Central (United Kingdom)

In the experiment on 60 dogs, it was established that the leading causes of unsatisfactory anastomotic healing in peritonitis were the disorders in hemocirculation and morphologic changes in the intestinal wall. This causes unsatisfactory healing of the inverted anastomoses, especially the multilayer ones. The everted suture with wide adaptation of the least changed submucous layer is the most reliable in these conditions. This permitted to use it in 7 patients with a positive result.

Vlasov AP

1991-01-01

370

Thermal expansion of irradiated polypropylene from 10-340 K  

International Nuclear Information System (INIS)

[en] The coefficient of thermal expansion of gamma-irradiated polypropylene (PP) has been measured from 10-340 K by using the three-terminal capacitance technique. The samples were irradiated to 500 Mrad in air at room temperature with gamma rays from a 60Co source at a dose rate of 0.26 Mrad h-1. The crystallinity of the sample was measured by X-ray diffraction and was found to decrease with radiation dose from 55% at O Mrad to 44.7% at 500 Mrad. The thermal expansion coefficient was found to be almost constant with radiation dose from 125-340 K. (author)

1993-05-01

371

A study of electrical conduction in polypropylene foil  

Energy Technology Data Exchange (ETDEWEB)

The dark current in commercial polypropylene (PP) is measured at temperatures ranging from 333 to 413 K and fields ranging from 70 to 125 kV/cm. The specimens are metallized on both sides by evaporated layers of silver and aluminium. An attempt is made to identify the nature of the current by comparing its observed dependence on electric fields, electrode material, and temperature with the respective characteristic features of the existing theories of electrical conduction. The observed results suggest that the electrical conduction in PP is governed by a Jonscher-Ansari modified Poole-Frenkel mechanism. (orig.)

Keller, J.M. (Dept. of Postgraduate Studies and Research in Physics, Rant Durgavati Univ., Jabalpur (India)); Datt, S.C. (Dept. of Postgraduate Studies and Research in Physics, Rant Durgavati Univ., Jabalpur (India)); Dubey, R. (Dept. of Postgraduate Studies and Research in Physics, Rant Durgavati Univ., Jabalpur (India)); Singh, R. (Dept. of Postgraduate Studies and Research in Physics, Rant Durgavati Univ., Jabalpur (India)); Khare, P. (Dept. of Postgraduate Studies and Research in Physics, Rant Durgavati Univ., Jabalpur (India))

1993-10-06

372

Fracture of ultrafine calcium carbonate/polypropylene composites  

Energy Technology Data Exchange (ETDEWEB)

The strength and fracture properties of a polypropylene filled with ultrafine calcium carbonate (0.07 micron) have been studied in the composition range of 0 to 40 percent by volume. Untreated and surface treated (with stearic acid and a titanate coupling agent) grades have been considered. The untreated filler caused a decrease of toughness, whereas a maximum, at about 10 percent, was observed for the treated filler. The fracture energy was analyzed in terms of the crack-pinning model. Due to the very small size of particles, the pinning contribution proved to be negligible. 30 references.

Levita, G.; Marchetti, A.; Lazzeri, A.

1989-02-01

373

High temperature pipeline coatings using polypropylene over fusion bonded epoxy  

Energy Technology Data Exchange (ETDEWEB)

The following is a discussion of test results and application techniques for high temperature pipe line coatings of polypropylene over fusion bonded epoxy. Recent tests to internal temperatures of 150 C (300 F) indicate these coatings, when applied properly, will perform well at these temperatures. Test results from several different tests are included. Repairs, field joints and bend coating with these type coatings are discussed. Problems during and after application are summarized. Use of well written specifications and experienced, dedicated inspectors add to the quality of the coating process. As industry moves to hotter and hotter production, these factors become even more critical in the pipeline coating process.

Norsworthy, R. [Tomar Systems, Inc., DeSoto, TX (United States)

1996-12-31

374

Grafting polymerization of styrene onto preirradiated polypropylene fabric  

International Nuclear Information System (INIS)

The grafting copolymerization of styrene onto polypropylene (PP) fabric has been studied by the preirradiation of gamma rays and electron beam, respectively. The PP fabric samples wee irradiated in the air and nitrogen gas individually. The effects of absorbed dose, styrene concentration in methanol, reaction temperature and reaction time on the degree of grafting were studied. Effects of storage time and temperature on the grafting rate were also observed. And a comparison of ?-ray and EB irradiation has been made. The results were reasonably interpreted by assuming that the grafting reaction was predominately initiated by trapped radicals

1998-01-01

375

The retention of suturing skills in dental undergraduates.  

UK PubMed Central (United Kingdom)

BACKGROUND: The ability to place sutures is an essential skill in dentistry. In our institution, the introduction of a video teaching aid and a checklist-based assessment has improved the standardisation of teaching as well as the transparency and objectivity of the assessment of suture skills. The aim of this study was to determine whether this skill once acquired is retained in the short term. MATERIALS AND METHODS: The same cohort of 67 fourth-year students performed the same assessment at two different time points 2 months apart. The first was a formative assessment and the second was a summative assessment. Feedback was collected on both occasions. RESULTS: On the first sitting of the assessment, 93% of the students were successful compared with 79% on the second occasion. Student feedback was similar on both occasions with 77% and 75% reporting that they thought it was an easy exam. On the first occasion, 27% thought that it was a stressful examination compared with 43% on the second occasion, which may have affected their performance. CONCLUSIONS: These findings suggest that regular reinforcement is required to avoid deterioration of suturing skills even in the short term. This might involve exposing the students to surgery earlier in the course and introducing regular formative assessments which the students appear to associate with less stress.

Macluskey M; Hanson C

2011-02-01

376

Polypropylene Track Membranes for Mikro and Ultrafiltration of Chemically Aggressive Agents  

CERN Multimedia

A production process for track membranes on the basis of chemically resistant polymer polypropylene has been developed. Research in all stages of the formation of the polypropylene track membranes has been conducted: the main principles of the process of chemical etching of polypropylene irradiated with accelerated ions have been investigated, the most effective structure of the etchant for a selective etching of the heavy ion tracks has been selected, the parameters of etching have been optimized. A method for sensibilization of latent tracks in polypropylene by effect of solvents has been developed. It helps to reach a significant increase in etching selectivity. A method for destruction of an absorbed chromocontaining layer on the surface of polypropylene track membranes formed during etching has been elaborated. Experimental samples of the membranes for micro and ultrafiltration have been obtained and their properties have been studied in course of their exploitation in chemically aggressive agents. For t...

Kravets, L I; Apel, P Yu

2000-01-01

377

Mechanical Properties of RC Beams with Polypropylene Fibers under High Temperature  

Directory of Open Access Journals (Sweden)

Full Text Available The objective of this study is to examine the impact of polypropylene fibers on fire resistance of steel reinforced concrete beams. In order to achieve this, concrete mixtures are prepared by using different contents of polypropylene; 0, 0.45 and 0.67 kg/m3. Simply supported beams are heated in an electric furnace to a temperature of 400° for exposure up to 4.5 hours and tested under a static point load on a universal loading frame. Based on the results of this study, it is concluded that the ultimate residual strengths of RC beams containing polypropylene fibers are higher than those without polypropylene fibers. Furthermore, the researchers find out that RC beams which are prepared using 0.67 kg/m3 of polypropylene fibers can significantly promote the residual ultimate strengths during heating.

Samir Shihada; Mohammed Arafa

2012-01-01

378

Radiation grafting of styrene and acrylic acid onto pre-irradiated polypropylene fabric  

International Nuclear Information System (INIS)

Grafting copolymerization of styrene and acrylic acid onto polypropylene fabric has been studied by using a pre-irradiation technique. The polypropylene fabric samples were irradiated by ?-ray and electron beam under the conditions of air and nitrogen gas. The effect of absorbed dose, monomer concentration in solvent, reaction temperature and reaction time on the degree of grafting were determined. The effects of metallic salts and sulphuric acid on the grafting yield of acrylic acid were also examined. The samples irradiated by electron beam gave a much higher degree of grafting than those by ?-ray when styrene was grafted to polypropylene fabric. However, the grafting yield of acrylic acid on polypropylene fabric in the condition of metallic salts and sulphuric acid showed the opposite results from the case of styrene. This effect was reasonably interpreted by assuming that the grafting is dominated by trapped radicals and peroxides in polypropylene. (author).

1997-01-01

379

Influence of Peritoneal Suture on the Formation of Abdominal Adhesions in Wistar Rats: Is Suturing Worthwhile?  

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Full Text Available Purpose: The purpose of the present study was to determine the effect of peritoneal closure on the formation of abdominal adhesions by verifying their degree of damage on intestinal portions and the omentum with the abdominal wall. Given the different reports found in the literature concerning peritoneal closure mostly in obstetrics and gynecology, any objective information based on statistically tested results may be of great value in the everyday surgery practice. Material and Method: This is an experimental model on which a laparotomy is performed on the free cavity of the abdominal wall in growing rats. Young Wistar rats (approximately 1 month old) were operated through a long median xipho-umbilical abdominal incision. The animals were divided in 3 groups with fifteen rats each: in Group I, only the peritoneum was left open and all the other layers of the abdominal wall were closed; the rats in Group II had their peritoneums closed with unabsorbable cord (Prolene 4-0, Ethicon®). The abdominal wall of the rats in Group III (control) was only opened up to the musculature. The peritoneum, which remained intact and closed, was carefully prodded with the grip of tweezers to avoid lesions and/or perforations in the peritoneum. Results: There were no deaths nor incisional dehiscence and/or hernias among the animals. Nine animals of Group I presented adhesions (60%), whereas there were adhesions in all the fifteen animals of Group II (100%). In Group III adhesions were found in two animals (13%). The percentage of adhesions in Group II was significantly higher than those observed in Groups I and III (p 0.0001). Adhesions were mostly formed by the abdominal omentum. It was not observed any effect of the procedure on viscera. Conclusion: The experimental model that was suggested is appropriate for the establishment and study of peritoneal adhesions. The rate of adhesions found in the Group II was significantly higher (p 0.0001) than the rate observed in the Group I and Group III, suggesting that peritoneum suture can play a important role in the adhesion processes.

Nathália Andrade; Michel Vinagre; Luciana Canabarro; Willy Marcus França

2013-01-01

380

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

UK PubMed Central (United Kingdom)

Primary suture repair of the 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 intestine submucosa (SIS) as a bioscaffold. It is hypothesized that the suturing technique will keep the torn ends together and that SIS will 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 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.

Nguyen TD; Geel J; Schulze M; Raschke M; Woo SL; van Dijk N; Blankevoort L

2013-06-01

 
 
 
 
381

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

Science.gov (United States)

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

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

2013-07-10

382

Influence of different types of surgical suture materials on mehanical damage of oral mucosa  

Directory of Open Access Journals (Sweden)

Full Text Available Introduction. Throughout history many kinds of different suture materials have been used for closing and suturing surgical wounds. Medical literature describes four basic characteristics of suture material: knot safety, tensile strength, tissue reaction and wound safety. The tissue reaction is reflected in an inflammatory response, which, though minimal, occurs during first two to seven days after implanting suture into the tissue. The aim of this research was to investigate whether different suture materials affect the development of decubital damage of oral mucosa, which to a great extent can compromise the process of wound healing. Material and methods. The investigation was designed as a prospective clinical study including 150 patients of both genders, aged between 25 and 60. The patients were distributed into three groups of 50 persons. The suture Black Silk was used in the first group, designated as a control group. Nylon and Vicril were used in the second and third group, i.e. experimental groups, respectively. Decubital damage of the surrounding soft tissues was the main parameter for monitoring the effects of selected suture materials on the oral mucosa. Conclusion. The comparison of results obtained for the investigated suture materials after suturing oral mucosa revealed that certain advan­tage could be given to synthetic monofilament suture materials

Mirkovi? Siniša; ?ur?evi?-Mirkovi? Tatjana

2011-01-01

383

Histopathologic comparison of chromic catgut suture materials from Iran and abroad  

Directory of Open Access Journals (Sweden)

Full Text Available (Received 19 December, 2009 ; Accepted 3 April, 2010)AbstractBackground and purpose: The chromic catgut sutures are the most common suture materials in surgical operations. The purpose of this in-vivo study was to evaluate the histopathological inflammatory reaction incited by four different kinds of catgut suture materials. Materials and methods: Twenty five adult New Zealand White rabbits, weighing approximately 2-3 kg, were divided into 5 groups of 5 rabbits in each group. Four types of catgut sutures were implanted in the dorsum and thigh muscles. After 2, 7, 14, 21 and 60 days, the animals were sacrificed and the sutures, subcutaneous and muscle tissues were removed from the implanted areas.Results: Statistical analysis for comparison of each two suture materials showed significant differences between groups (p<0.05) while ETHICON suture showed minimum inflammatory reaction and was considered the best. Conclusion: Uncontrolled raw materials of the catgut suture from the intestine of particular animals may cause a variety of pathological effects beyond the threshold set for medical surgery.Key words: Chromic catgut suture, implantation, suture material, pathology, rabbitJ Mazand Univ Med Sci 2009; 20(74): 33-42 (Persian).

Mehdi Marjani; Masoud Hashemi; Reza Sedaghat

2009-01-01

384

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

UK PubMed Central (United Kingdom)

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

Savage E; Hurren CJ; Slader S; Khan LA; Sutti A; Page RS

2013-01-01

385

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

Science.gov (United States)

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

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

2012-07-09

386

[Histological changes of craniofacial sutures after retractive forces with zygomatic implant anchorage to the maxilla of rhesus monkeys].  

UK PubMed Central (United Kingdom)

PURPOSE: To demonstrate the histological changes of the maxilla-facial sutures caused by retractive forces of a zygomatic implant anchorage to the maxilla of rhesus monkeys. METHODS: Four young male rhesuses were employed, 3 in the experimental group (1 was been distracted for 1.5 months and 2 for 3 months), and 1 as control. HE staining and vital fluorescent were used to observe histological changes in the circum-maxillary sutures (i.e. zygomaticomaxillary suture, transverse palatine suture, frontomaxillary suture and pterygopalatine suture) and the posterior sutures (i.e. zygomaticotemporal suture and sphenozygomatic suture, sphenozygomatic suture) of zygoma bone caused by retractive forces of zygomatic implant to the maxilla of rhesus monkeys. RESULTS: Obvious reactions of compressive stress and bone resorption were observed around the 4 circum-maxillary sutures. There were 3 patterns of sutural reactions, indicating the direction of sutural stress influenced by sutural position and morphology. Reactions of interdigitate wedging were observed in the transverse palatine suture and frontomaxillary suture, showing a bony collision that the tip of bony process and the hollow were resorbed markedly. Phasic reactions were found in the pterygopalatine suture reaction, representing a bony sliding that one side of a bony surface was deposited while the opposite side was resorptive. Both reactions were observed in the zygomaticomaxillary suture. Tensile stresses were observed in the 3 sutures around anchoraged zygoma bone (i.e. zygomaticotemporal suture, sphenozygomatic suture and sphenozygomatic suture) with similar three-pattern reactions. CONCLUSIONS: Histologically, significant changes differing from physiological remodeling are observed in the circum-maxillary sutures and posterior sutures of zygoma bone, but no destructive changes are found. These findings demonstrate that bone resorptions are major reactions caused in the 4 circum-maxillary sutures. Different sutures respond slight histological differences. The maxillary complex is retracted distally with some rotation. Tensile stress occured in the posterior sutures around zygoma bone with a zygomatic implant anchorage, which is different from the effect with a headgear. Supported by Science and Technology Plan Project of Yunnan Province (2007C0029R).

Zhang XR; Zeng XL; Xu Y

2013-06-01

387

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

UK PubMed Central (United Kingdom)

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

Hennecke K; Redeker J; Kuhbier JW; Strauss S; Allmeling C; Kasper C; Reimers K; Vogt PM

2013-01-01

388

On engineering of properties of wood-polypropylene composite  

Directory of Open Access Journals (Sweden)

Full Text Available New materials based on wood have the advantage in the sense that their properties can be engineered so as to correspond to user demands. The properties which can be engineered are those relating both to their utilisation and machining, in particular - the tensile strength, elongation at break, modulus of elasticity and impact resistance. The research at the Faculty of Forestry and "Hipol" Chemical Industry related to the new type of wood-polypropylene composite. The content of wood filler was varied in the range between 40% and 70% mass contents of beech wood flour. After the highest tensile strength at 50% of filler content was determined, the effect of the wood filler origin was also examined at this content value. Therefore, wood flour of beech, poplar, acetylated pine and the waste MDF was used. The influence of the composition of the wood filler (beech combined with MDF, poplar and acetylated pine) in comparison with pure polypropylene matrix was also examined, as well as the effect of the type of coupling agent. Hopefully, the results obtained in this study might serve as the initial data for production of easily machined high-strength composites.

?iporovi? Milanka; Miljkovi? Jovan; Dingova Eva

2006-01-01

389

Improvement of printability and adhesion of polypropylene films by radiation  

International Nuclear Information System (INIS)

Polyethylene and polypropylene are widely used, but have the demerits that the printing and adhesion by ordinary methods are difficult. Generally those are improved by corona discharge treatment, but it is still insufficient. Therefore, the reforming by radiation was attempted by using polypropylene films. The reforming was carried out by the methods of the graft polymerization of acrylic acid by gamma ray, low energy electron beam, plasma processing and spray method using low energy electron beam, and by coating the mixture of monomer and oligomer and hardening by low energy electron beam. The separation strength (adhesion) from Scotch tapes and the printability by cross cut separation method of the reformed films were measured. In the graft polymerization methods, for obtaining the graft ratio of several %, the reaction time of several tens minutes was required. By the spray method and coating method, the adhesion was increased to about three times as high as that of the samples without irradiation. Printing is feasible in the reformed films, but those by the spray method are not suitable to fine printing because of surface unevenness. The continuous process mainly using the spray method was tested, and the reformed film of several tens m was made. The results are reported. (K.I.).

1989-01-01

390

Randomized controlled multicenter international clinical trial of self-gripping Parietex™ ProGrip™ polyester mesh versus lightweight polypropylene mesh in open inguinal hernia repair: interim results at 3 months.  

UK PubMed Central (United Kingdom)

PURPOSE: To compare clinical outcomes following sutureless Parietex™ ProGrip™ mesh repair to traditional Lichtenstein repair with lightweight polypropylene mesh secured with sutures. METHODS: This is a 3-month interim report of a 1-year multicenter international study. Three hundred and two patients were randomized; 153 were treated with Lichtenstein repair (L group) and 149 with Parietex™ ProGrip™ precut mesh (P group) with or without fixation. The primary outcome measure was postoperative pain using the visual analog scale (VAS, 0-150 mm); other outcomes were assessed prior to surgery and up to 3 months postoperatively. RESULTS: Compared to baseline, pain score was lower in the P group at discharge (-10%) and at 7 days (-13%), while pain increased in the L group at discharge (+39%) and at 7 days (+21%). The difference between groups was significant at both time points (P = 0.007 and P = 0.039, respectively). In the P group, patients without fixation suffered less pain compared to those with single-suture fixation (1 month: -20.9 vs. -6.15%, P = 0.02; 3 months: -24.3 vs. -7.7%, P = 0.01). The infection rate was significantly lower in the P group during the 3-month follow-up (2.0 vs. 7.2%, P = 0.032). Surgery duration was significantly shorter in the P group (32.4 vs. 39.1 min; P < 0.001). No recurrence was observed at 3 months in both groups. CONCLUSIONS: Surgery duration, early postoperative, pain and infection rates were significantly reduced with self-gripping polyester mesh compared to Lichtenstein repair with polypropylene mesh. The use of fixation increased postoperative pain in the P group. The absence of early recurrence highlights the gripping efficiency effect.

Kingsnorth A; Gingell-Littlejohn M; Nienhuijs S; Schüle S; Appel P; Ziprin P; Eklund A; Miserez M; Smeds S

2012-06-01

391

In vivo assessment of absorbable knotless barbed suture for single layer gastrotomy and enterotomy closure.  

UK PubMed Central (United Kingdom)

OBJECTIVE: To compare the performance of an absorbable barbed suture device to absorbable monofilament suture after single layer, appositional gastrotomy and enterotomy closure. STUDY DESIGN: Experimental comparative study. ANIMALS: Purpose-bred adult mongrel hounds (n?=?14). METHODS: Bursting strengths up to 250?mmHg of incisional closure with either monofilament or barbed suture in a simple continuous, appositional pattern at sites in the stomach (2), jejunum (4), and colon (4) were compared at postoperative Days 3, 7, and 14. Time for incisional closure was compared between materials. RESULTS: Bursting strength was not significantly different between gastrotomies/enterotomies closed with the monofilament suture or the barbed device. Closure time was significantly reduced with the barbed device in jejunal enterotomy closure. CONCLUSION: The barbed device compared favorably with monofilament suture for gastrotomy and enterotomy (small intestine, colon) closure. Results demonstrate comparable burst strengths between monofilament suture and the barbed device. Closure time was significantly reduced in jejunum closure using the barbed device.

Ehrhart NP; Kaminskaya K; Miller JA; Zaruby JF

2013-02-01

392

[Transformation of bioprosthesis-artery anastomotic area after blood exposure: the effect of suture material  

UK PubMed Central (United Kingdom)

Vascular graft implantation is accompanied with tissue reaction which is determined partially by the nature of suture material. In experiments in vitro edges of arterial diepoxid-preserved bioprostheses were sutured with Prolene filament, nickelide-titanium wire (TiNi) or absorbable polydioxanone monofilament (PDS). Morphological changes in anastomotic area after blood exposure were assessed with scanning electronic microscope. Protein deposits in anastomotic area were detected 5 min after blood exposure, being more loose and bulky around Prolene sutures. The protein layer became more compact 120 min since blood exposure. Most homogeneous protein sorption was over TiNi-sutured anastomoses. Suture material affected blood cells as well - some red cells have transformed into echinocytes. Heparin-modified samples demonstrated less negative impact of suture material in anastomotic area. The worst results after 120 min of blood exposure were obtained for PDS filaments.

Zhuravleva IIu; Kudriavtseva IuA; Zinchenko SS; Titov AT; Barbarash LS

2007-01-01

393

Study of polypropylene/polybutene blends modified by gamma irradiation and (high melt strength polypropylene)/polybutene blends  

Energy Technology Data Exchange (ETDEWEB)

It is well-known that polypropylene (PP) is difficult to process as a consequence of its linear structure. It is also known that grafting of long-chain branches on PP backbone using ionizing radiation is an effective approach to achieve high melt strength polypropylene (HMS PP). Chain-scission and, in minor extend, crosslinking and grafting are the predominant reaction in order to branch PP backbone. However, if multifunctional monomers are used to promote the grafting reaction, crosslinking can surpass chain scission and grafting, reducing drawability. Therefore, in an effort to enhance the processability and so the drawability, it has been found helpful to add a small amount of polybutene-1. Gamma irradiation technique was used to induce chemical changes in blends of PP and polybutene in acetylene atmosphere (crosslinker promoter) and in HMSPP/polybutene blends. The samples were irradiated with a {sup 60}Co source with doses of 12.5 and 20 kGy in the presence of acetylene. In this work, two different methods of blends processing were compared regarding rheological and mechanical properties. Effects on the strength and elongation at the yield point and at rupture were observed by mechanical tests and showed decrease of tensile strength and increase of elongation at rupture for samples obtained by irradiation of blends. The results from rheology demonstrated an increase in melt strength and drawability of blends.

Yoshiga, Adriana; Otaguro, Harumi; Lima, Luis Filipe C.P. [Instituto de Pesquisas Energeticas e Nucleares IPEN/CNEN, Av. Lineu Prestes 2242, Cidade Universitaria, CEP 05508-900, Sao Paulo-SP (Brazil); Artel, Beatriz W.H. [Empresa Brasileira de Radiacao, Av. Cruzada Bandeirante, 269, CEP 06700-000, Cotia-SP (Brazil); Parra, Duclerc F.; Rodrigues Bueno, Jeferson; Shinzato, Rodrigo [Instituto de Pesquisas Energeticas e Nucleares IPEN/CNEN, Av. Lineu Prestes 2242, Cidade Universitaria, CEP 05508-900, Sao Paulo-SP (Brazil); Farrah, Marcelo [BRASKEM, III Polo Petroquimico, Via Oeste, Lote 5, CEP 95853-000, Triunfo-RS (Brazil); Lugao, Ademar B. [Instituto de Pesquisas Energeticas e Nucleares IPEN/CNEN, Av. Lineu Prestes 2242, Cidade Universitaria, CEP 05508-900, Sao Paulo-SP (Brazil)], E-mail: ablugao@ipen.br

2007-12-15

394

Study of polypropylene/polybutene blends modified by gamma irradiation and (high melt strength polypropylene)/polybutene blends  

International Nuclear Information System (INIS)

It is well-known that polypropylene (PP) is difficult to process as a consequence of its linear structure. It is also known that grafting of long-chain branches on PP backbone using ionizing radiation is an effective approach to achieve high melt strength polypropylene (HMS PP). Chain-scission and, in minor extend, crosslinking and grafting are the predominant reaction in order to branch PP backbone. However, if multifunctional monomers are used to promote the grafting reaction, crosslinking can surpass chain scission and grafting, reducing drawability. Therefore, in an effort to enhance the processability and so the drawability, it has been found helpful to add a small amount of polybutene-1. Gamma irradiation technique was used to induce chemical changes in blends of PP and polybutene in acetylene atmosphere (crosslinker promoter) and in HMSPP/polybutene blends. The samples were irradiated with a 60Co source with doses of 12.5 and 20 kGy in the presence of acetylene. In this work, two different methods of blends processing were compared regarding rheological and mechanical properties. Effects on the strength and elongation at the yield point and at rupture were observed by mechanical tests and showed decrease of tensile strength and increase of elongation at rupture for samples obt