| 摘要 |
<p>The heart valve prosthesis comprises an annular body (1), support means (8) having an upstream support surface (9), a downstream support surface (10) and a side surface (11) facing the central axis (12) of said annular body (1), and leaflets (13) mounted within said annular body (1) so as to pivot between a closed position in which the blood backflow (5) is restricted and an open position which allows the passage of the direct blood flow (4). Each leaflet (13) has a contact surface (14) cooperating with the contact surface of the other leaflet in the closed position, an outer side surface (15), an upstream surface (16), a downstream surface (17) and support portions (24, 25) respectively interacting with said downstream support surface (10) and said upstream support surface (9) of said support means (8) of said annular body (1). At least one portion (19) of the outer side surface (15) of at least one of said leaflets (13) is formed such that a clearance is provided between said portion (19) and said side surface (11) of said support means (8) of said annular body (1) and at said portion (19) a downstream projection (20) and an upstream projection (21) are provided, the upstream surface (22) of said downstream projection (20) and the downstream surface (23) of said upstream projetion (21) forming the support portions (24, 25). <IMAGE></p> |
