HEART VALVE PROSTHESIS.

摘要

The artificial heart valve consists of a ring (9) with a shut-off element (10) joined to it by a coupling (11) which allows the shut-off element to rotate between its open and closed positions. The coupling, located on the inner surface of the ring, is itself annular in shape and fits against the rings' surface. It can be made with an inward projection (13) and a recess on its inner surface (14), and has a shut-off element in two halves (12) which open and close together to control the passage of blood through the valve. Each of the shut-off element halves is slightly curved in shape and has curved cam surfaces on its side facing towards its matching half, ensuring the appropriate distance between the two halves when in the open position.