| 摘要 |
A heart valve protheses includes the usual generally annular body (23) having an interior surface (27) defining a blood flow passageway and having one or two occluders (25) supported thereon for alternately blocking and then allowing the flow of blood in a predetermined direction. Notches (39) are formed at opposite locations in the periphery of an occluder (25) and each is disposed about a pivot post (47) that projects radially inward from the interior surface (27) of the annular body (23). A pair of stops (45,47) flank each pivot post (47), having curved surfaces (57) at locations adjacent to the pivot posts (47) but oppositely disposed fulcrums and cooperate with the pivot posts (47) in defining the opening and closing movement of each occluder (25). Preferably, the pivot pins and the step means (45,47) are formed as an integral structure. Self-centering seats (161,163) can be used to provide a better seal in the closed position. |
