VALVE FOR VENTRICULAR ASSIST DEVICE
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United States of America Patent
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Issued Date -
Nov 10, 2011
app pub date -
May 5, 2010
filing date -
May 5, 2010
priority date (Note) -
Abandoned
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Abstract
A ventricular-assist-device valve includes two flaps hinged to a peripheral wall by means of a couple of flexible struts. As each flap opens and closes during each cycle of operation, the struts flex and open passages for flow around them, around the flaps, and between the struts and the flaps, so as to prevent the formation of dead zones that contribute to the accumulation and deterioration of blood cells that produce clotting. The struts are tensioned so as to exert a pressure against the flow of the blood stream when the flaps are open. This tension creates a pressure differential between the underside and the peripheral regions of the flaps that forces blood flow around the hinges and washes out stagnant cells. As a result, clotting is materially reduced.
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