Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Heart valve – Having rigid or semirigid pivoting occluder
Patent
1990-05-30
1992-04-28
Shay, Randy C.
Prosthesis (i.e., artificial body members), parts thereof, or ai
Heart valve
Having rigid or semirigid pivoting occluder
A61F 224
Patent
active
051084252
ABSTRACT:
A heart valve having a pair of leaflets of identical construction provides low pressure drop and freedom from thrombosis and hemolysis. The leaflets have flat sections wherein a pivot mechanism is incorporated and curved sections which are located downstream of the flat sections. The outflow or facing surface of each of the two leaflets is of two-dimensional, convex curvature whereas the opposite or inflow surface regions are of a composite concave-convex curvature on both sides of a central ridge which bisects the curved inflow surface section of each leaflet. The curvature of the downstream regions of each leaflet is fashioned so that a peripheral surface, which extends about the arcuate downstream edge of each leaflet, is of a substantially constant and relatively minimal thickness. As a result, not only is there extremely low boundary layer separation in the blood flowing along the surfaces of the leaflet but there is extremely low turbulence in the bloodstream just past the trailing edge which minimizes hemolysis at this point.
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patent: 4425670 (1984-01-01), Figuera
patent: 4484365 (1984-11-01), Murguet et al.
patent: 4535484 (1985-08-01), Marconi
patent: 4775378 (1988-10-01), Knoch et al.
patent: 4808180 (1989-02-01), Johnson
patent: 4846830 (1989-07-01), Knoch et al.
patent: 4872875 (1989-10-01), Hwang
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