✦ LIBER ✦

In vivo degradation of silicone rubber poppets in prosthetic heart valves

✍ Scribed by Cuddihy, Edward F. ;Moacanin, Jovan ;Roschke, E. John ;Harrison, Earl C.

Publisher: John Wiley and Sons
Year: 1976
Tongue: English
Weight: 427 KB
Volume: 10
Category: Article
ISSN: 0021-9304
DOI: 10.1002/jbm.820100314

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

Dynamic shear modulus G′ was measured throughout the volume of three nonvariant silicone rubber poppets which were recovered from aortic prosthetic heart valves that had been implanted for 4 days, 52 days, and 8 years. Similar measurements were obtained for two unused silicone rubber poppets. Although the recovered poppets exhibited no obvious physical evidence of damage, the silicone rubber had undergone in vivo degradation throughout the poppet volume as indicated by decreases in modulus. The measurements also indicate that the poppet surface degrades at a rate faster than the core. Further, comparison with data reported in the literature suggests that the surfaces of variant poppets degrade at a rate faster than the surfaces of nonvariant poppets.

📜 SIMILAR VOLUMES

In vitro testing of silicone rubber hear

In vitro testing of silicone rubber heart-valve poppets for lipid absorption

✍ Carmen, Raleigh ;Kahn, Paul 📂 Article 📅 1968 🏛 John Wiley and Sons 🌐 English ⚖ 306 KB

## An in vitro procedure for measuring the affinity of silicone rubber balls for The method appears to duplicate weight and volume in-Potential lipid absorption is shown to in-lipid is described. creases occasionally noted in vivo. crease with degree of cure, and decrease with filler content.

In vivo degradation of silicones

✍ Leoncio Garrido; Bettina Pfleiderer; Mikhail Papisov; Jerome L. Ackerman 📂 Article 📅 1993 🏛 John Wiley and Sons 🌐 English ⚖ 473 KB

## Abstract ^29^Si nuclear magnetic resonance (NMR) spectroscopy is applied to study the degradation of polysiloxanes (silicones) __in vivo.__ Our results with animal models show that silicone migrates from the implant to the liver (^29^Si resonance at −20 ppm) and new silicon containing compounds

In vivo tissue reactivity of radiation-c

In vivo tissue reactivity of radiation-cured silicone rubber implants

✍ Gifford, George H. ;Merrill, Edward W. ;Morgan, Michael S. 📂 Article 📅 1976 🏛 John Wiley and Sons 🌐 English ⚖ 431 KB

## Abstract Silicone rubber implants are clinically used in large numbers and elicit a mild tissue reaction. An occasional patient develops an accentuated reaction, an observation which has stimulated clinicians to try to understand this process more fully. The chemistry of medical silicone implant

Structural deterioration of prosthetic o

Structural deterioration of prosthetic oesophageal tubes: An in vitro comparison of latex rubber and silicone rubber tubes

✍ F. J. Branicki; A. L. Ogilvie; M. R. Willis; Michael Atkinson 📂 Article 📅 1981 🏛 John Wiley and Sons 🌐 English ⚖ 318 KB

In vivo testing of silicone rubber joint

In vivo testing of silicone rubber joint implants for lipid absorption

✍ Meester, Walter D. ;Swanson, Alfred B. 📂 Article 📅 1972 🏛 John Wiley and Sons 🌐 English ⚖ 334 KB

Silicone rubber implants removed from patients undergoing revision arthroplasty were examined for breakage and cracks and analyzed for lipid content. No relationship was observed between lipids extracted from the implants and the implantation time. Neither was the absorption of lipids and the incide

Successful thrombolysis of a partially o

Successful thrombolysis of a partially obstructed bileaflet prosthetic heart valve in the mitral position

✍ John Barbetseas; Michael Vitalis; Gregory Vyssoulis; Spyros Lambrou; Constantina 📂 Article 📅 2003 🏛 John Wiley and Sons 🌐 English ⚖ 128 KB

## Abstract We describe the case of a woman who presented with dyspnea of abrupt onset and who had recently undergone replacement of the mitral valve with a bileaflet mechanical prosthesis. Transthoracic echocardiographic examination with spectral Doppler recording of transvalvular blood flow revea