| 摘要 |
A heart valve prosthesis includes an annular body, a support having an upstream support surface, a downstream support surface and a side surface facing the central axis of the annular body, and leaflets mounted within the annular body so as to pivot between a closed position in which the blood backflow is restricted and an open position which allows the passage of the direct blood flow. Each leaflet has a contact surface cooperating with the contact surface of the other leaflet in the closed position, an outer side surface, an upstream surface, a downstream surface and support portions respectively interacting with the downstream support surface and the upstream support surface of the support of said annular body. At least one portion of the outer side surface of at least one of the leaflets is formed such that a clearance is provided between the portion and the side surface of the support means of the annular body and at the portion a downstream projection and an upstream projection are provided, the upstream surface of the downstream projection and the downstream surface of the upstream projection forming the support portions.
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