PROSTHETICS FOR HEART VALVE Russian patent published in 1998 - IPC

FIELD: cardiac surgery. SUBSTANCE: invention relates to replacing injured natural valves of human heart. PROSTHETICS contains annular casing 1 enclosing locking member in the form of two flaps 2 rotating relative to casing. Each flap has ascending surface 3 and descending one 4, as well as side surface 5 and abutting surface 6. On descending surface 4, there are regions of bearing surface made in the form of two pairs of oppositely arranged cams 7 preventing joining of flaps 2 in open position. On end surface 9 of casing 1, there are two members 10 for fastening flaps made as protrusions with ascending bearing surface 11 facing forward blood flow, descending bearing surface 12 facing back blood flow, and side surfaces 13 facing each other. Side surfaces 12 of members 10 are mutually parallel. Distance between these surfaces is larger than or equal to diameter of inner surface 8 of casing 1. The latter comprises converging region 18. Descending bearing surface 12 of above-mentioned member 10 is located at the level of end surface 9 of casing 1. On the opposite sides of abutting surface 6 of flaps 2, there are protrusions 14 interacting with ascending bearing surface 11 of member 10, whereas on the side surface 5 of flaps 2, there are additional protrusions 17 interacting with descending bearing surface 12 of member 10 and converging region 18 of inner surface 8 of casing 1. All over the perimeter of outside surface of casing 1, there is annular cage 16 made of carbon material with elasticity modulus larger than that of material of casing 1. Cage 16 is solidly and immovably joined with casing 1, which not only increases rigidity of casing, but also strengthens it. Improvement of hemodynamic characteristics of PROSTHETICS is achieved by placing member 10 of fastening of flaps 2 beyond hydraulic opening of casing 1 and thereby not additionally disturbing blood flow. Increased reliability of PROSTHETICS is achieved through executing annular cage 16 with carbon material with elevated rigidity and strength. EFFECT: improved performance characteristics of PROSTHETICS. 5 cl, 6 dwg