A replacement prosthetic heart valve for engagement with a structure of an original prosthetic heart valve that includes at least one visually detectable marker. The replacement heart valve includes a stent structure having a generally tubular body portion and at least one visually detectable marker...http://www.google.de/patents/US20090192591?utm_source=gb-gplus-sharePatent US20090192591 - Markers for Prosthetic Heart Valves
