A prosthetic valve and an associated method of implanting the valve within a blood vein utilize a valve support ring and a pair of leaflet members pivotally connected to the ring. The valve is positionable within a radial plane of the blood vessel for permitting substantially unidirectional flow through...http://www.google.de/patents/US4851001?utm_source=gb-gplus-sharePatent US4851001 - Prosthetic valve for a blood vein and an associated method of implantation of the valve
