| 摘要 |
<p>A bileaflet heart valve prosthesis (110) comprises an annular base (112), and pivoting leaflets (114). Each leaflet is 'free-floating' within recesses (132) without fixed rotational axis in order to increase translational movement and redistribute stresses. Each recess fluidly communicates with a groove extending at least partially around the inner surface (126) of the annular base, and fluid flow is directed through the recesses at different angles during antegrade circulation retrograde circulation, and valve closure. A recess entrance angle to each of the recesses is preferably less than about 35 degrees, and the pivoting mechanism within the recess includes first and second fulcrum edges (164, 166) of each leaflet shiftably engaged with side surfaces (136, 138) of the respective recesses. The leaflets have a beveled bottom side (143) having two separate planar surfaces (144, 146) which lie at an angle to one another.</p> |
