| 摘要 |
<p>A heart valve of the bi-leaflet or monoleaflet type having improved reductions in drag on blood flow through the fully opened heart valve. The leaflets are pivotally mounted in a heart valve body for movement between closed and opened positions. The leaflets have opposed inflow and outflow surfaces. The inflow surface includes a concave region located downstream of the leaflet pivot axis, and a convex region located downstream of the concave region. The outflow surface of the leaflets is generally convex, at least in that portion directly opposing the concave and convex regions of the inflow surface. The angle of leaflet opening is controlled to values ranging between 70 DEG and about 89 DEG .</p> |
