US Patent 7871436 Replacement prosthetic heart valves and methods of implantation

A replacement prosthetic heart valve for engagement with a structure of a previously implanted prosthetic heart valve, the replacement heart valve including a stent structure and at least two leaflets attached within the interior area of a tubular body portion of the stent structure. The stent structure includes a generally tubular body portion having an interior area, at least two upper flange portions for positioning at an outflow end of the previously implanted heart valve, wherein the upper flange portions extend radially outward from the tubular body portion and are biased toward an inflow end of the replacement heart valve, and at least one lower flange portion for positioning at an inflow end of the previously implanted heart valve, wherein the lower flange portions extend radially outward from the tubular body portion and are biased toward an outflow end of the replacement heart valve.