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Results for “Polyesters”

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At least 163 records · Page 9Linked to original sources

PubMed1991

[Evaluation of long term results of treating patellar fractures with polyester sutures].

The late results of patellar fractures treatment with polyester suture in 24 patients with an average follow up of 8.1 year was presented. The method proved to be useful in transverse fractures of the central and distal part od the patella as well as in multi-fragmented ones. The evaluation of patello-femoral arthritic changes has remarkably influenced the overall clinical result. The displacement of 2 mm or more within articular surface existing postoperatively implicates bad prognosis, polyester suture is mechanically strong and requires no additional operation to remove the material used for fixation.

Adult↗

PubMed1989

[Sternotomy wound closure with polyester tapes].

We developed the special polyester tape with Tetron coating for sternal closure. Fifty consecutive open heart cases had the sternum closed with the tapes in the past six months at Nippon Medical School Hospital. There was no sternal infection or mediastinitis postoperatively. The tape closure method was more effective in approximation of sternum than the ordinary wire closure, especially in the case with fragile sternum. Although a long term follow-up is necessary, the result of sternal closure with the polyester tape has been satisfactory.

Humans↗

PubMed1989

[Interference of inflammation caused by polyester with the growth of Yoshida ascite hepatoma. IV. Modifications of the sedimentation profile of the hepatoma cells].

It was previously shown that Yoshida's ascites-hepatoma cells (Y cells) intraperitoneally injected into rats carrying chronic inflammation caused by polyester thread rapidly disappear. In this paper the sedimentation rate in a continuous Percoll gradient at unit gravity (1 g) using the CELSEP apparatus (Sorvall), the mean diameter and volume of the Y cells harvested from the peritoneal cavity of untreated (NT) and polyester-treated (TM) animals were determined at 6-12-18-24 hours after the inoculum. At 6 hours a number of Y cells appeared enlarged both from TM and NT rats, while afterwards, and notably at 18 and 24 hours, their size was decreased and their sedimentation rate was reduced only in TM animals. It seems that the chronic inflammation causes alterations both in the size and in the density of the Y cells and probably one of the mechanisms of their death is through shrinkage and apoptosis.

Animals↗

PubMed1987

Polyester film as an advantageous tool for light and ultrastructural examination of single cells infected with viruses.

The use of marked transparent polyester film as a support of cell monolayer, smears or sections (cryostat or paraffin), makes possible to examine the same cell preselected in the light microscope by electron microscope (EM). Consequently, this technique enables to use histological or immunohistological investigations (using immunofluorescence or peroxidase (Px) labelling) by light microscopy before examination in EM. As example we used herpes simplex virus (HSV) type 1-infected cells grown on the above mentioned polyester film. Visualization of the antigen with hyperimmune serum and Px-labelled antiserum was followed by examination of selected cells in EM, where viral particles were clearly visible.

Cells, Cultured↗

PubMed1987

[Treatment of female urinary stress incontinence with a Zoedler suspension-plasty and a new, stable, radiopaque polyester sling].

We report on 183 patients with urinary stress incontinence treated with bladder-neck suspension plasty according to Zoedler from 1972-1982 using the conventional nylon sling. 86.1% of the patients were continent postoperatively. Long term follow-up to 10 years however showed a continuous decrease of success rate in the first 2 postoperative years (74.9% in the 1st, 67.2% in the 2nd year). From the 3rd postoperative year there was a stable continence-rate of 50.7%. As the significant increase of incontinence relapse is due to enzymatic destruction of the nylon sling--first described in ophtalmology--we developed a new form-stable and radiopaque polyester sling. Since 1983 we implanted this new sling in 40 patients. Long term results of the conventional Zoedler procedure and first results of a modified method using the new polyester sling are discussed.

Female↗

PubMed1987

[Progressive complications associated with polyester arterial prostheses. Study of 61 specimens following surgical excision].

Reports of individual surgical cases tend to be anecdotal because of the unique circumstances surrounding the patient, the surgeon, the intervention and, where applicable, the prosthetic device. To overcome this limitation the authors have taken a wider collaborative approach and report the analysis of 61 explanted polyester arterial prostheses associated with delayed complications on 53 patients reoperated upon in six different French hospitals. One advantage of such an independent and centralized retrieval programme is that the impact of centre specific factors, such as patient selection and surgical techniques, is minimized. Consequently, by following a standardized protocol for the evaluation of the morphologic, pathologic and mineralogic characteristics of the tissue surrounding the excised grafts, as well as the textile structure of the prostheses themselves, it has been possible to distinguish between iatrogenic and disease related complications and to demonstrate a number of general findings associated with the clinical performance of polyester arterial prostheses. Complications such as thromboses, infections and false aneurysms appear to occur randomly after different lengths of implantation, thicker fibrous tissue capsules are associated with velour grafts with highly textured yarns, the incidence of mineralized tissue and of endothelialized luminal surfaces is rare, weft knitted textile prostheses appear less mechanically stable and more sensitive to iatrogenic trauma than warp knitted, and the incidences of lipid and cholesterol adsorption, bacterial colonization and sterile fluid loss need further investigation. These observations lead to the recommendation that for patients with longer life expectancies surgeons should consider selecting low porosity, woven or warped knitted prostheses which contain yarns that have not been highly textured.

Adult↗

PubMed1979

Airway responsiveness in workers processing polyester resins.

In 22 employees of a button-manufacturing plant, exposure to polyester resins over an eight-hour work shift resulted in an acute reduction of flow rates on maximum expiratory flow volume (MEFV) curves at MEF50% and MEF25%. In the workers studied, preshift administration of 80 mg of propranolol potentiated, while 1 mg of subcutaneously injected atropine significantly inhibited, the bronchoconstricting effect of the resins, indicating that the autonomic nervous system plays an important role in determining airway smooth muscle response to polyester resins. Although a high prevalence of acute symptoms (cough, shortness of breath, throat and eye irritation) over the work shift was recorded in exposed workers, no high prevalence of chronic respiratory symptoms was found. No definite evidence of chronic airway obstruction was recorded in exposed workers.

Adult↗

PubMed1982

Radiosterilized polyester knitted nets Dallop.

Polish surgical polyester knitted nets Dallop sterilized by radiation were implanted and tested on Wistar rats. The results of the experimental evaluation are positive and lead to the conclusion that the Dallop radiosterilized polyester nets may be used in humans. The evaluated knittings fulfill the most up-to-date biological requirements and may be utilized as implantation material for plastic and reconstructive surgery.

Abdomen↗

PubMed1980

[The use of polypropylene-polyester prostheses in cranioplasty].

The polypropylene-polyester prostheses were investigated in respect of their usefulness in cranioplasty. Experiments were performed upon 2 to 10 years old mongrels. It was stated that polypropylene-polyester prostheses did not produce any general reactions. X-ray examinations did not show any evidences of pathological changes in cranial bones adjoining the prosthesis. Histological investigations revealed slight inflammation and moderate foreign body reaction caused by the operation. The prosthesis had good mechanical resistance and it was well fixed in the place of implantation. Mechanical resistance and good tolerance may be the basis for the use of the prostheses in clinical cases.

Animals↗

PubMed1981

[Morphological evaluation of the healing process after implantation of knitted polyester net into the muscles and bones].

The usefulness of Polish polyester knitting used for reconstruction of aperidesmial tendons was tested in experiments. For this reason morphological picture was observed in place of knitting and muscle or bone connection at 39 adult rabbits. Calcaneal tendon together with plantar muscle tendon were replaced by polyester prosthesis, so thick as the rabbits tendon. After the autopsy, macroscopic and microscopic examination were performed. It was revealed, that in the first phase severe inflammation is observed, then granulation and cicatrization in surrounding tissues enables the healing process of the knitting. Meshy structure of the knitting facilitates its penetration through the fibrous tissue. The examinations prove complete assimilation of the implant to muscle and bone tissue.

Animals↗

PubMed1995

The gelweave polyester arterial prosthesis.

OBJECTIVE: To determine the effect of the gelatin coating on the efficacy of Gelweave, a new gelatin-sealed woven polyester graft material, as an arterial prosthesis. DESIGN: In-vitro and in-vivo studies of the prosthesis. SETTING: A laboratory of experimental surgery in a university teaching institution. SUBJECTS: After in-vitro testing of the material, eight dogs were subjected to a series of in-vivo tests to evaluate the properties of Gelweave in comparison with its unsealed precursor and a commerically available collagen-coated woven polyester prosthesis. INTERVENTION: Implantation of the prosthesis as a thoracoabdominal bypass for prescheduled periods ranging from 4 hours to 6 months. MAIN OUTCOME MEASURES: Physical and chemical properties of the virgin prosthesis compared with the other two prostheses, effects of the gelatin-sealed prosthesis on healing, the hematologic characteristics of the dogs before operation and at sacrifice, microscopic studies, fibrin and platelet uptakes, prostaglandin secretion, and properties of the Gelweave grafts removed at varying periods after implantation. RESULTS: The gelatin sealant in the Gelweave prosthesis effectively reduced the water permeability of the new prototype to zero. Neither blood loss at implantation nor infection during the postimplantation period was observed. The gelatin impregnation did not cause any adverse response in the dogs and was completely lysed within 2 weeks, thus allowing encapsulation and graft healing to progress satisfactorily. After 2 weeks, the prostacyclin:thromboxane ratio was greater than 1.0, whereas the fibrin and platelet uptakes on the luminal surface of the Gelweave grafts remained low, regardless of the period of implantation. Analysis of the explanted grafts confirmed that this gelatin-sealed prototype prosthesis healed satisfactorily and no adverse biologic response occurred as a result of the gelatin coating. It maintained its biostability during 6 months in situ. CONCLUSION: The new Gelweave arterial prosthesis is ready for clinical use as a thoracic and abdominal vascular substitute.

Animals↗

PubMed1994

[Improved sternotomy closure with polyester tapes and conventional wires].

In the purpose of reducing the occurrence of postoperative sternal dehiscence, improved technique of closure with supplemental use of polyester tapes was performed. To add to the conventional closure with wires, two polyester tapes were used around the body of sternum through the intercostal spaces just before approximation of sternum. The sternum was firmly fixed at the body and the tapes will prevent cut sternum by the wires and disruption of the wires themselves. In our series of recent 155 cases with this technique of closure, no sternal dehiscence occurred.

Bone Wires↗

PubMed1996

[Impregnated polyester prostheses: a theoretical advantage].

Leak-proof polyester grafts impregnated with collagen, gelatine or albumin are routinely used in vascular surgery. Theoretically, there are several advantages: no need for pre-coagulation, reduced operation time and graft manipulation, less blood loss during the operative period, better healing with a potentially greater resistance to infection. We analyzed all the publications in scientific journals to verify whether these theoretical advantages are validated by clinical trials. There have been 12 non-comparative series reporting favourable results but the lack of control groups makes it difficult to draw conclusions. Five comparative series with random assignment of patients have been reported. None of these series showed a substantial benefit from impregnation. Thus the use of an impregnated polyester graft would not appear to be justified for routine standard aorto-iliac surgery. Conversely, although no evidence has been provided by a comparative study, the major risk of haemorrhage in procedures such as extra-corporal circulation, the thoracic or abdominal aorta and in patients with a coagulation disorder, impregnated graft probably constitute an important progress.

Albumins↗

PubMed1997

The acceptability and effectiveness of a polyester drinking-water filter in a dracunculiasis-endemic village in northern region, Ghana.

In the global effort to eradicate dracunculiasis (guinea-worm disease) one of the main tools is the use of filters for filtering unsafe drinking-water. The expensive and high-quality monofilament nylon filters, which for many years were donated to all dracunculiasis-endemic countries, are now mainly reserved for highly endemic countries. Polyester cloth is less expensive, and we investigated the user acceptability and effectiveness of this material as a drinking-water filter in a dracunculiasis-endemic village in Northern Region, Ghana, over a 3-month period. The polyester cloth completely retained the stages of copepods that are responsible for transmitting dracunculiasis. Over the 3-month study period a majority of respondents found that the new cloth was superior to the nylon filter with regard to strength (83%), filtering time (80%), and the ease with which the filter could be cleaned (87%). Inspection revealed that the filters were used intensively and that the new cloth was damaged after 2-3 months of use, which is also the case for the monofilament nylon filters.

Animals↗

PubMed1998

Laparoscopic inguinal hernia repair using fine-caliber instruments and polyester mesh.

Laparoscopic inguinal hernia repair (LH) requires similar scar size to traditional open repair. To perform LH with minimal access, finer instruments were used. A 5-mm laparoscope was inserted from the umbilicus, and surgical instruments were inserted through 5- and 3-mm trocars to perform LH by the transabdominal preperitoneal approach. Polyester mesh was placed over the hernia orifice and the peritoneum was closed with 3-0 silk sutures. Sixteen patients underwent smaller access LH and 24 had standard LH. Although smaller access LH took longer (105.7 versus 83.9 min), significantly fewer patients required analgesia after smaller access LH than after standard LH (12.5 versus 70.8%), and the postoperative hospital stay was shorter (4.6 versus 5.6 days). In addition, a better cosmetic outcome was obtained with smaller access LH. In conclusion, access was minimized by using fine-caliber instruments and polyester mesh, making LH less invasive and improving the cosmetic outcome.

Adult↗

PubMed1986

The cytocompatibility of compound polyester-protein surfaces using an in vitro technique.

To avoid the need to preclot porous polyester (Dacron) vascular prostheses, we have proposed the use of a protein coating that will promote the growth and adhesion of endothelial cells. This study assessed the relative advantages of coating woven, knitted, and velour polyester fabrics with albumin, collagen, and a albumin-collagen mixture after preservation in saline or drying by a commercial dehydration process. Preclotted fabrics were used as controls. The cytocompatibility of these biopolymers was measured by an organotypic culture technique which relies on the migration of chick embryonic endothelial cells. After 7 d of culture the cytocompatibility was quantified by counting the cells in the area of migration and the morphology of the endothelial cells was observed by scanning electron microscopy. In general, the knitted and velour fabrics showed superior compatibility than the woven one. The results confirmed that collagen, either alone or combined with albumin, provides in most cases a more cytocompatible surface than albumin alone. A cell morphology most closely resembling that of natural arterial endothelial cells was observed on the albumin-collagen substrate.

Albumins↗

PubMed1987

Radiosterilization of albuminated polyester prostheses.

The study reported here is concerned with the radio-sterilization of Dacron vascular prostheses coated with crosslinked albumin. gamma-Radiations have no effect on the mechanical properties of the polyester fibres or on their crystallinity, whether irradiated in a dry state or immersed in saline. Special attention has been paid to the release of the albumin, or protein fragments from the reticulum using 125I-labelled albumin as a radiotracer. The albumin leakage depends upon the type of Dacron fabrics considered but the values derived from radioactivity measurements are always greater than those directly measured, which indicates a radio-induced break of the bond between iodine and albumin; this has nothing to do with the break of the association between albumin and Dacron. Moreover no cytotoxicity of the irradiated immersion medium has been observed using a test based on organotypic culture in liquid medium. Thus radio-sterilization of an albuminated polyester vascular prosthesis immersed in saline appears to be a suitable procedure.

Albumins↗

PubMed1995

New bioactivation mode for vascular prostheses made of Dacron polyester.

The performance of vascular prostheses, especially those of small calibre, still presents several problems. The use of polyesters such as the well-known poly(ethylene terephthalate) (Dacron) and, more recently, poly(tetrafluoroethylene) and polyurethanes provides a marked improvement. We have developed a process to increase the efficiency of such prostheses, using the ability of the Dacron polyester to be covalently modified by proteins under mild chemical conditions. The biomaterial is obtained from the particular interaction of elastin-solubilized peptides with type I + III collagens under very precise conditions. We have obtained an irreversible covalent bonding on Dacron. These biological conditions and the addition of connective proteins and glycosaminoglycans conferred on the resulting material a composition and a three-dimensional structure equivalent to the subendothelium, providing bioactive properties suitable for the development of a vascular prosthesis.

Biocompatible Materials↗