Mitral valve prosthesis

Abstract

The invention relates a cardiac valve prosthesis consisting of a support housing(stent) with a large base ring that bears two stays which substantially extend in the ring axis direction and are connected by curved walls for securing two flexible cusps, the free ends of the stays form an inner support for the cusps. In order to avoid a possible mutual interference between the heart and valve functions, the base ring(12), in the top view, has a closed, non-round shape with a common longitudinal axis(15) but two transverse half-axis(16, 17) of different sizes. The stays (18, 19) lie on the longitudinal axis and form the transition between the two halves of the valve, in which the less curved wall(13) carries a mural cusp(11) having a smaller surface and a higher angle of inclination relative to the base ring base surface than the more curved wall(14).

Description

technical field [0001] The invention relates to an artificial mitral valve heart valve, consisting of a supporting shell (Stent) with a base ring, which supports two circular arcs substantially facing the axis of the ring, through which two soft sails are fixed. Wall-attached strut, the free end of which forms the inner bracket of the sail (Segel). Background technique [0002] This mitral heart valve is sewn into body tissue with the aid of a sewing ring secured to the base ring. [0003] The first mitral heart valve according to the state of the art has a tubular valve housing in which two sails, one of which has a shape cut from the surface of the cylinder, support each other in the closed state and in the closed state The open state rests against the cylindrical wall of the valve housing. As already mentioned in DE 27 42 681 B2, the closing capacity of such heart valves is not very good. Second, a relatively long valve housing is required. To improve this, it is prop...

AI Technical Summary

Problems solved by technology

As the closure pressure differential increases the sails may become concave against the flow direction, invaginate each other, and fit against each other along their free edges, which may result in complete coaptation of the sails, thereby closing the valve as desired, but at very low differential pressures. When large, it can also cause excessive overlap of the free edges of the sails, resulting in undesired sail folds

In order to reduce the considerable stresses in the upper region of the sail corresponding to the natural commissure adjacent to the stent tip, it has been proposed that the struts be designed to be flexible in the upper part, but this can lead to undesirable creep phenomena, resulting in premature material fatigue

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