A heart valve prosthesis for use in a heart includes an orifice defining a lumen therethrough for blood flow. An occluder is carried in the orifice and is movable between an open position which allows blood flow through the lumen and a closed position in which flow through the lumen is blocked....http://www.google.fr/patents/US5843179?utm_source=gb-gplus-shareBrevet US5843179 - Suture guard for prosthetic heart valve
