| http://www.w3.org/ns/prov#value | - Because of the inherent rigidity in conventional heart valves, the natural dilatation of the annulus is restricted, imposing an artificial narrowing of the orifice, and increasing the pressure drop therethrough. [0007] Accordingly, there is a need for a more flexible heart valve that responds to the natural motions of the annulus and downstream vessel walls.
|
