主权项 |
1. A leaflet for a low pressure gradient prosthetic heart valve, comprising:
a flexible leaflet having an arcuate cusp edge opposite a free edge and opposed attachment tabs therebetween, the leaflet having a central area subject to stress when secured within a surrounding heart valve support frame, the leaflet being symmetric about a central midplane and the arcuate cusp edge being defined by a complex curve of multiple radii, the complex curve having its smallest radius on the central midplane that gradually increases on both sides away from the central plane, reaches a maximum at about 45° angle from the central axis, and then gradually decreases to two corners where the two ends of the arcuate cusp edge meet the attachment tabs. |