Cardiac valve prosthesis

Details Cardiac valve prosthesis Cardiac valve prosthesis

A - Human Necessities

61

F

3/117

A61F 2/24 (2006.01)

Patent

CA 1296842

ABSTRACT Cardiac Valve Prothesis It is a disadvantage of the known monocuspid valve prostheses that, in completely open position, for generating a sufficient opening moment, the flow must be diviated unilaterally with a resultant change of direction of the momentum flux. As a consequence thereof, pressure losses are high and the deadwater area in the aorta ascendens is extensive. The flow is intensively vortexed and subjected to strong fluctuations also in the main flowing phase. In the upper zone of the aortic sinus, a significant stagnation point is formed. Said disadvantages are avoided in the instant invention by an S-shaped curve of the closing body (12) in the skeleton line. The inlet area (17) and the outlet area (16) are oriented towards the flow, while the opening force is exclusively effective in the central region behind the swivel axis (13). The S-shaped geometry favor the formation of a stable, closed vortex on the suction side of the closing body with a resultant contribution to less deadwater in the aorta ascendens (22) and to a more favorable closing behaviour. The aortic wall is less stressed and the aorta ascendens is better washed out. According to the invention, the pressure loss in the area of the opening angle is relatively low. Due to the geometry of the closing body, a very short swivel time and a low reflux volume upon closing are favored. (Fig. 1)

556964

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