The invention relates to a prosthetic valve for regulating fluid flow
through a body lumen. The valve includes a frame and a valve member
comprising at least one semi-rigid leaflet and at least one flexible
leaflet. The at least one semi-rigid leaflet comprises a first portion
and a second portion, the first portion attached to the frame and the
second portion free of the frame. The at least one semi-rigid leaflet is
slanted in a retrograde direction from the second portion to the first
portion. The at least one flexible leaflet comprises a first portion and
a second portion, the first portion attached to the frame and the second
portion free of the frame. The at least one flexible leaflet is slanted
in a retrograde direction from the first portion to the second portion
when at rest.