Multiple component heart valves and apparatus and methods for implanting them are provided. The heart valve generally includes a first annular prosthesis and a second valve prosthesis. The first prosthesis includes an annular member compressible from a relaxed condition to a contracted condition to facilitate...http://www.google.co.uk/patents/US20070265701?utm_source=gb-gplus-sharePatent US20070265701 - MULTIPLE COMPONENT PROSTHETIC HEART VALVE ASSEMBLIES AND APPARATUS FOR DELIVERING THEM
