Single-leg separations In explanted Bjork-Shiley convexo-concave heart valves

Hedger, Philip

doi:10.1016/s0140-6736(94)91141-x

The Lancet

1994

DOI: 10.1016/s0140-6736(94)91141-x

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Single-leg separations In explanted Bjork-Shiley convexo-concave heart valves

Philip Hedger¹

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1996

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Stress Corrosion Cracking in Björk-Shiley Convexo-Concave Prosthetic Heart Valves Due to Random in vivo Electrochemical Pulsing

Xiao¹,

Appleby

1996

Int J Artif Organs

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Welded downstream struts of Björk-Shiley Convexo-Concave heart valves show failure in vivo, but not in in vitro testing. A pyrolytic carbon pivoting disk occluder closes against a Haynes 25 alloy ring, which is electrochemically machined from solid with the upstream retaining struts. The weld area is de-alloyed, with residual porosity and carbide inclusions. The valve becomes a short-circuited electrochemical cell when fully open or closed. It is an aggressive chloride electrolyte, whose high pulsed flow (2 m/s) ensures that supply of oxygen-rich cathode reactant is not mass-transport-limited. During the flight of the occluder, the cell is randomly at open circuit. A random current pulse is applied to the metal parts on circuit closure. Failure is not from simple mechanical fatigue, but from stress-corrosion-cracking and erosion of the less noble weld area caused by these pulses. All welded valves of this type may be susceptible to ultimate in vivo failure.

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Stress Corrosion Cracking in Björk-Shiley Convexo-Concave Prosthetic Heart Valves Due to Random in vivo Electrochemical Pulsing

Xiao¹,

Appleby

1996

Int J Artif Organs

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show abstract

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Single-leg separations In explanted Bjork-Shiley convexo-concave heart valves

Cited by 1 publication

References 2 publications

Stress Corrosion Cracking in Björk-Shiley Convexo-Concave Prosthetic Heart Valves Due to Random in vivo Electrochemical Pulsing

Stress Corrosion Cracking in Björk-Shiley Convexo-Concave Prosthetic Heart Valves Due to Random in vivo Electrochemical Pulsing

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