Prosthetic closure element for the replacement of the mitral and tricuspid valve in the human heart
AssigneeDr. E. Fresenius Chem.-Pharm. Industrie KG
InventorsHelmut Reul, Dhanjoo N. Ghista
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Abstract
A prosthetic heart valve has a tubular valve housing, a suture ring, and a membrane-like gate supported within the housing. The flexible membrane is generally elliptical in shape and is fastened in the housing along half its periphery. Flexure of the membrane moves it between an open position which permits blood flow through the housing and a closed position which blocks the flow path of the housing.
Claims13
A prosthetic closure element for the replacement of the mitral and tricuspid valve in the human heart having a valve housing, a suture ring for the attachment of the valve housing in the tissue and a flap movably mounted within the housing, characterized in that the flap is formed in the form of a thin flexible membrane and generally represents that part of the surface of an elliptical cylinder ##EQU4## which is cut out by a circular cylinder x.sup.2 +y.sup.2 =R.sub.i.sup.2, whereby R.sub.i is the radius of the circular cylinder and .alpha. is half the valve opening angle and whereby the angle between the central axes of the two cylinders in the closed condition of the membrane amounts to 90.degree. and in the open condition amounts to 90.degree.-2 .alpha.;
- that the valve housing (3) represents generally a part of the surface of a circular tube with an inner radius R.sub.i and an outer radius R.sub.a which is cut by the elliptical cylinder under an angle of 90.degree.;
- and that the membrane (5) is fastened along the half periphery of the intersection edge (13) between the pair of extreme points (14) of said valve housing.
Dependencies are inferred from the claim text.