| 摘要 |
<p>A heart valve prosthesis (1) has a substantially annular valve body (2) and two leaflets (3) which are disposed in the valve body (2) and, by means of a hinge mechanism (4, 5a, 5b), are pivotable betwe en an open position and a closed position. The leaf- lets (3) are substantially semicircular and evenly curved in two perpendicul ar directions, one direction being perpendicular to the diameter of the semicircle, so as to bulge outward, as seen from the centre of the annulus (2). The leaflet edges (6) closest to the diameter of the semicircle are so curved that they, when the valve is closed , are applied against one another along their entire length. Further, two projections (7) are provided on the inside of the annul us (2), entirely within the width thereof, the corner por- tions (8) of the leaflets (3) being applied against these projections when t he valve is closed.</p> |
