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sorbus microphylla/fatica
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4 risultati
Fatigue analysis of clinical bioprosthetic heart valves manufactured using photooxidized bovine pericardium.
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OBJECTIVE
Recent reports have given details of early clinical failures of bioprosthetic heart valves manufactured using dye-mediated photooxidized bovine pericardium. These failures were attributed to abrasion of the inflow surface of the leaflets against the cloth-covered inner face of the outer
Evaluation of tilting disc valves after fatigue life testing: preliminary results within a comparison program.
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A fatigue life test, by accelerating the beat rate, simulates several years of virtual life of a prosthetic heart valve in a short period of time. The correlation between the in vivo life of a valve and in vitro testing expectations is as yet not well established, but reproducible test conditions
New evolution in mitral physiology and surgery: mitral stentless pericardial valve.
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The human adult mitral valve, with a mean diastolic area of up to 7.6 cm2, excess leaflet surface area for coaptation in systole, mitral annulus-papillary muscle continuity, and systolic constriction of the posterior left ventricular wall around the mitral annulus functions in concert with other
Kinematics of synthetic flexible leaflet heart valves during accelerated testing.
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OBJECTIVE
The study aim was to examine the effect of variation of test frequencies on the duration and kinematics of valve leaflets during opening, and at the fully open position.
METHODS
Trileaflet polyurethane heart valves were tested in a Rowan Ash fatigue accelerator at 5, 10 and 15 Hz. Images
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