Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Heart valve – Having rigid or semirigid pivoting occluder
Patent
1993-05-03
1995-03-14
Green, Randall L.
Prosthesis (i.e., artificial body members), parts thereof, or ai
Heart valve
Having rigid or semirigid pivoting occluder
137527, A61F 224
Patent
active
053973470
ABSTRACT:
An artificial heart valve is the combination of curved wings and a ring inside of which the curved wings are hinged. The ring extends between an inlet and an outlet end, which ends are bisected by a center plane. The ring has diametrically opposed shoulders on the inlet end, and each shoulder is formed with a pair of hemispherical cavities. Each curved wing has a pair of opposite hemispherical enlargements shaped to cooperate with the hemispherical cavities in the shoulders such that spaced pivot axes are defined for the curved wings. The hemispherical enlargements are arranged on the wings and the hemispherical cavities are correspondingly arranged on the ring such that the curved wings, when in an extreme open position of approximately at least 85 degrees to the center plane of the ring, project minimally beyond the outlet end of the ring. Preferably, any length of the curved wings that would project beyond the outlet end would be less than an axial length of the ring. The curved wings, when in the open position, delimit three equivalent flow areas to promote a central axial and laminar flow. The hemispherical enlargements are integrated into a thickness of the ring so that there is a smooth surface in the regions of the hemispherical enlargements and cavities. The smooth surface avoids disturbing or interfering with the central laminar flow. Preferably, the curved wings and the ring are formed from titanium and covered with a film of amorphous and isotropic carbon.
REFERENCES:
patent: 3546711 (1970-12-01), Bokros
patent: 4178639 (1979-12-01), Bokros
patent: 4443894 (1984-04-01), Klawitter
patent: 4863458 (1989-09-01), Bokros
patent: 4892540 (1990-01-01), Vallana
Baudet Eugene M.
Cuilleron Jean
Fabrique d'Implants et d'Instruments Chirurgicaux Sarl
Green Randall L.
Jones Mary Beth O.
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