Heart valve prosthesis

摘要

The invention relates to medical devices and can be used in cardiac surgery for replacement of the diseased native heart valves in humans. The objective of the invention is to increase thromboresistance of heart valve prosthesis. A heart valve prosthesis ( Fig. 1 ) comprising an annular housing 1 with the inner surface 2 defining the blood flow I through the valve prosthesis and leaflets 3 mounted within the annular housing 1 with the possibility to pivot around the reference axis (shown by the dash-and-dot line 0-0) between an open position which allows the passage of the direct blood flow I, and a closed position which restricts the blood backflow II. Each leaflet 3 has an upstream surface 4 facing the direct blood surface I, a downstream surface 5 facing the blood backflow II, a coaptation surface 6, and a side surface 7. Console projections 8 radially oriented are provided at the inner surface 2 of the housing 1, and each leaflet has a slot 9 which corresponds to said projection. The inner surface 2 of the housing 1 is mainly cylindrical, and the downstream surface 5 of each leaflet 3 is in the form of the crossing cylindrical 5a and conical 5b surfaces. The upstream surface 4 of each leaflet 3 is in the form of the cylindrical surface. Higher thromboresistance of the heart valve prosthesis is achieved through elimination of the elements which introduce disturbances into the blood flow and reduction of the number of hinged joints.