| 摘要 |
PURPOSE:To develop excellent valve function by preventing that the movement of the free edge of a valve membrane is obstructed by the connection part with the inner wall of a valve chamber even if said valve membrane is made of an artificial material by providing the valve membrane whose entire peripheral edge is the free edge in the valve chamber through a valve membrane fixing part washed with passing blood so as to provide a sufficient distance between the valve membrane fixing part and the free edge. CONSTITUTION:A valve body 1 having a valve chamber 4 formed thereto so as to continue to an outflow port 3 from an inflow port 2 is composed of silicone rubber, urethane rubber, etc. artificial material suitable for an artificial cardiac valve. A valve membrane fixing part 5 is formed to the inner wall of the valve chamber 4 so as to be always washed with passing blood. The outer peripheral edge of the annular valve membrane 6 connected to the valve membrane fixing part 5 at the base part thereof becomes a free edge 6b whose movement is not obstructed by the valve membrane fixing part 5 and the opening and closing of the valve is performed by the free edge 6b of the valve membrane 6. Since a sufficient distance is provided between the free edge 6b of the peripheral edge and the valve membrane fixing part 6, the movement of the free edge 6b does not become bad partially even if the whole is formed from an artificial material in a small size and the generation of a fine thrombus apt to generate when movement is insufficient is certainly prevented. |
