Prosthetic mitral heart valve

Abstract

The invention relates to a prosthetic mitral heart valve consisting of a support housing (10) comprising a base ring (15) supporting two posts which point essentially in the direction of the ring axis and which are connected by arc-shaped walls (13, 14), these walls being used to fix two flexible leaflets. The free ends of said posts form an inner support for the leaflet. The base ring, as seen from above, has a closed, noncircular shape with a common longitudinal axis but two different-sized semi lateral axes. The posts lie on the longitudinal axis and form the transitional point from one half of the shape to the other. The invention provides that in order to avoid undercuts which can contribute to turbulence, the plane in which the connection line (17) between the tips of the posts (18, 19), and the common longitudinal axis of the post base ring shape lie is tilted at an angle (alpha) of 10° to 20°, preferably 15°, in relation to the plane that leads through the common longitudinal axis and lies vertically in relation to the surface (21) formed by the base ring; and the wall with the greater curvature supports the leaflet with the smaller surface (the mural leaflet), positioned at a greater angle to the surface formed by the base ring compared to the wall with the greater curvature.

Description

technical field [0001] The present invention relates to a prosthetic mitral heart valve consisting of a supporting shell with a base ring supporting two arcs pointing substantially in the direction of the ring axis, via which two flexible leaflets are fixed side posts connected by shaped walls, the free ends of each side post forming the inner support of the leaflets, wherein viewed from a top view, the base ring has a closed non-circular shape comprising a common longitudinal axis but two Half transverse axes of unequal size, each jamb lies on the longitudinal axis and forms a transition point from one half of the shape to the other. Background technique [0002] One such mitral heart valve is known from WO97 / 49355. In order to avoid a possible mutual functional impairment of the heart and heart valves, it is suggested in this publication that the walls of lesser curvature differ from the walls of greater curvature to support a smaller area arranged at a greater angle of i...

AI Technical Summary

Problems solved by technology

Although the arrangement and structure of the mitral heart valve ensure a favorable physiological flow guidance from the atrium to the ventricle and are in contrast to the embodiments known from the prior art with a circular or symmetrical oval support housing cross-section Compared with heart valves with a smaller structural height, but not completely avoiding the turbulent flow during flow-through, which occurs in the region where the expanded inner wall forms a lower depression (Hinterschneidung) with respect to the direction of flow-through, that is, the edge that is behind the convex and forms With respect to the area of ​​the recess in the flow passage, the recess promotes the formation of undesired turbulence

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