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Results for “Silicone Elastomers”

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At least 19 recordsLinked to original sources
PubMed1975

Total intravenous nutrition with peripherally inserted silicone elastomer central venous catheters.

Long-term indwelling central venous catheters inserted peripherally for total intravenous nutrition have been complicated by thrombophlebitis in most instances. However, experiences with silicone elastomer catheters used in this manner have not been previously reported. In this investigation a crank introducer unit has been developed that has allowed 61-cm silicone elastomer catheters to be placed in the superior vena cava with insertion in the basillic or cephalic vein. Thirty-five patients (36 catheter placements) received total intravenous nutrition exclusively via these silicone elastomer catheters. The mean time indwelling was 20.4 days (range, four to 56 days). Thirty of the 36 catheters were removed when total intravenous nutrition was discontinued. Only six catheters were removed for nonvenous and venous reactions. These results have shown the safety and efficacy of peripherally inserted silicone elastomer central venous catheters.

Catheterization↗
PubMed1979

Long-term intravenous therapy with peripherally inserted silicone elastomer central venous catheters in patients with malignant diseases.

Peripherally inserted central venous silicone elastomer catheters were studied in 81 patients who had malignancy requiring prolonged intravenous therapy. The catheters remained in place from 5 to 171 days, with a median of 30 days. Ninety-one percent of the catheters were unassociated with clinical complications. Six percent of 87 inserted catheters were removed due to peripheral thrombophlebitis. Two patients developed subclavian thrombosis, requiring catheter removal. One patient had catheter-related sepsis with Staphylococcus aureus. Bacteria grew from eleven percent of the cultured catheter tips. Indwelling catheters presence did not appear to influence response to antibiotic therapy. We conclude from this pilot study that long-term central venous access with peripherally inserted silicone elastomer catheters has an acceptably low complication rate in a high-risk patient population.

Adolescent↗
PubMed1978

Surface morphology of polyvinyl chloride and silicone elastomer umbilical artery catheters by scanning electron microscopy.

The surface features of a new silicone elastomer umbilical artery catheter have been defined by scanning electron microscopy and compared with those of a standard polyvinyl chloride catheter. Little difference was noted in the surfaces of the catheter materials themselves, but the radiopaque material used to render the catheters visible by x-ray resulted in a considerable difference in the overall smoothness. The polyvinyl chloride catheter's marker was in the form of a wide, rough band extending the length of the tubing whereas the marker particles of the silicone elastomer were dispersed, more uniform in size, and resulted in less overall irregularity of the surface.

Catheterization↗
PubMed1977

Silicone lymphadenopathy and synovitis. Complications of silicone elastomer finger joint prostheses.

We report two complications of silicone elastomer finger joint prostheses. In one patient, the prostheses broke, with silicone particles present in synovium ("detritic synovitis"). In another patient, silicone particles were found in an axillary lymph node five years after insertion of prostheses in the ipsilateral hand (prostheses were intact at the time). Microscopically, silicone particles in synovium and lymph node were identical to particles abraded from a new prosthesis.

Arthritis, Rheumatoid↗
PubMed1979

Silicone elastomer for nasojejunal intubation and central venous cannulation in neonates.

Modifications are described to two techniques using silicone elastomer tubing in neonatal nutrition. The first enables nasojejunal intubation to be performed easily for feeding by this route. The second provides a central venous line for parenteral alimentation. These modifications are suggested as improvements to the original techniques described.

Catheterization↗
PubMed1979

[Materials testing demonstration of the suitability of a viscous plastic silicone elastomer for long-term functional impressions].

Comparative laboratory tests with elastomers as well as clinical trials showed that the visco-elastic silicone elastomer "Stefanat zähplastisch" (manufacturer: VEB Arzneimittelwerk Dresden, Leipziger Arzneimittelwerk) is suited for long-term dynamic impression. It is necessary to use a special, exactly dosed cross-linking agent and to apply the reactive material carefully.

Clinical Trials as Topic↗
PubMed1975

Silicone elastomer sheeting in the development of pedicle flaps.

A "delay" of a pedicle flap stimulates improvement in the flap circulation, probably through partial ischemia. The degree of stimulation prsent at any given time is inversely proportional to the length of time that has passed after the delay because progressive revascularization across the delay lines reduces the ischemis stimulus. This revascularization can ve prevented by placing silicone elastomers (Silastic) sheeting between the flap and its bed.

Animals↗
PubMed1976

[Scientific basis for impression taking with silicone elastomers].

Starting from the chemical and physical processes which occur during the cross-linking of silicones, the author represents the material and processing properties of these impression compounds. He reports above all of the results of utilizationoriented studies which evidence the effects of different conditions of processing on the behaviour during impression taking and on the impression itself. Conclusions are drawn as to the appropriate use of silicone impression materials.

Dental Impression Materials↗
PubMed1977

A comparative study of peripherally inserted silicone catheters for parenteral nutrition.

One hundred patients receiving parenteral nutrition with lipids and hypertonic amino acids and glucose were divided into five groups of 20, depending on the type of intravenous catheter used for the infusion. Least satisfactory were the short Butterfly needles (average 3.3 days in place) and the long peripherally inserted polyvinyl central venous catheters (average 6.2 days in place). Subclavian catheters of polyvinyl (average 15.3 days) or silicone elastomer (average 17.5 days) were equally efficacious. A new long silicone elastomer catheter inserted peripherally was most satisfactory (average 29.5 days). Problems common with polyvinyl catheters (phlebitis, thrombosis, and sepsis) rarely occurred with either the long or short silicone elastomer catheter.

Catheterization↗
PubMed1979

[Scanning electron microscopy of different materials after urine contact in vitro (author's transl)].

The nature of the surface of the used material is determining the complication rate in medium and long term application of nephrostomy and bladder catheters as well as ureteral splints. Tubings made of 8 different materials were irrigated for one to three weeks by means of an urolithic simulator, the pH-values from 5.8 to 7.0. Scanning electron Microscope showed good values with respect to silicon elastomer, teflon and ethylenacrylicacid copolymer. Considering technical and economical factors it seems to be proven that silicon elastomer and polyurethane are the most appropriate materials for splints and catheters, whereas rubber and PVC are less suitable for long time application.

Catheters, Indwelling↗
PubMed1975

Staged surgery in ears with excessive disease of tympanum.

Results regarding tympanic healing and hearing improvement are reported in a series of 84 one-stage operations on the middle ear, using thin silicone elastomer sheeting, and of 76 two-stage operations using temporary filling of the middle ear with paraffin wax, and of ten with silicone elastomer sponge. All epithelium was removed from the tympanic cleft at the primary operation. Staging of the operation gave better hearing results and resulted in fewer adhesive middle ears. Middle ear mucosal biopsies from ears with mucus production around the paraffin showed an increased number of glands and secreting epithelial cells, much as in glue ears. Residual or recurrent cholesteatoma appeared in only 2.4%, which is attributed to resection of the posterior canal wall in cases of cholesteatoma, as contrasted with the intact canal wall technique.

Air↗