Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Heart valve – Having rigid or semirigid pivoting occluder
Reexamination Certificate
1999-01-08
2001-01-30
Willse, David H. (Department: 3738)
Prosthesis (i.e., artificial body members), parts thereof, or ai
Heart valve
Having rigid or semirigid pivoting occluder
C623S002280
Reexamination Certificate
active
06179869
ABSTRACT:
BACKGROUND OF THE INVENTION
Field of the Invention
The invention relates to a heart valve prosthesis used for the replacement of natural heart valves and more particularly to an artifical heart valve with a valve ring in which three wing valves are mounted.
In the subsequently published DE 195 32 973 Cl a heart valve is proposed having the features of the preamble of claim
1
, in which the surface of the wing valves which is outwardly directed in the opened state is given a continuously curved construction and the axes are outwardly displaced with respect to the body of the wing valves. EP 283 413 Al discloses a similarly constructed valve, in which the area directed in the flow direction forms a bevel running from the outside to the inside. The axis of the wing valves passes through the body thereof.
SUMMARY OF THE INVENTION
The construction according to DE 195 32 973 has the advantage that the flow resistance is low, but the disadvantage of an inadequate closing behaviour.
The problem of the invention Is to so further develop the known heart valve, that in the case of a limited flow resistance it has a good closing behaviour.
According to the invention this problem is solved by a prosthesis for the replacement of heart valves, with a valve ring with a radius R, in which three wing valves are mounted in rotary manner about in each case an axis located in the ring plane, in which the axes in the projection on the ring plane have a distance of 0.5R to 0.9R form the center of the ring plane, the axes, considered in the central flow direction, are outwardly displaced with respect to the body of the wing valves, the edges of the inwardly directed portions, in the closed state, engage flush on the edges of the corresponding portions of the other wing valves, the faces of the wing valves directed inwards in the opened state, are substantially elongated, and the faces of the wing valves, directed outwards in the opened state, in their area pointing in the central flow direction are provided with a bevel passing from the outside to the inside and which in the closed state of the valve extends from the center of the ring plane over 0.2 to 0.5 R. A preferred embodiment of the invention provides that in their area directed against the flow direction in the opened state, the wing valve are rounded.
The invention is described in greater detail hereinafter relative to the attached drawings, wherein show:
REFERENCES:
patent: 4846830 (1989-07-01), Knoch et al.
patent: 4908028 (1990-03-01), Colon et al.
patent: 5326372 (1994-07-01), Mhatre et al.
Tricumed Medizintechnik GmbH
Willse David H.
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