| 摘要 |
PROSTHETIC HEART VALVE Bi-leaflet heart valves (10, 91) have valve body contours and pivot arrangements that create quick valve response to flow reversal. Valve members or leaflets (14, 95), which can have flat or curved inflow and outflow surfaces, are slidably and pivotally mounted in a heart valve body (12, 93) of contoured profile so they can be aligned precisely parallel to blood flow in the open position. The leaflets engage either projections (26, 28) extending radially inward from flat wall sections (24) in the valve body sidewall or grooves (101, 103) in flat wall sections (117). The shape and relationship of these interengaging surfaces, together with a centrally directed urge of backflowing blood which results from the strategic location of a pair of downstream side openings provided by recesses (45, 114a) in the annular valve body, cooperate to provide prompt closing rotation of the leaflets from a parallel open orientation.
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