Heart valve prosthesis

A heart valve prosthesis comprising a ring-shaped supporting structure to be anchored at the valve annulus, and a valve leaflet of flexible material floatingly supported by said supporting structure, characterized in that

• said supporting structure comprises a support wall portion at which a root end of the valve leaflet is connected, and a complementary wall portion opposite to said support wall portion, which supports a static or quasi-static coaptation surface adapted to be sealingly engaged by a free end of the valve leaflet, and extending in a direction substantially parallel to the movement direction of the free end of the valve leaflet at the coaptation surface;
• said free end of the valve leaflet is connected to said support wall portion or to said complementary wall portion by means of at least one traction member of flexible material, which is dimensioned to such a length that the movement of the free end of the valve leaflet is stopped at said coaptation surface.

A prosthesis having a support structure, a support wall portion, a complementary wall portion and a single extended valve leaflet supported by said support structure, wherein said complementary wall portion supports a static or quasi-static coaptation surface adapted to be sealingly engaged by a free end of the valve leaflet.