The present invention relates to a cardiac valve (100, 300), the cardiac valve having an open valve configuration and a closed valve configuration, the cardiac valve comprising a support frame (102, 302) having an outer surface (106, 306) and defining a lumen (126, 326), the support frame comprising a first frame end member (110, 310) defining a first frame end opening and a second frame end member (112, 312) defining a second frame end opening (134, 334), the first frame end member (110, 310) forming a first frame end, the second frame end member (112, 312) forming a second frame end and a cover (104, 304) attached to the outer surface of the support frame (102), the cover comprising a first cover end, a second cover end region, and a second cover end (150, 372) the second cover end region having a predetermined shape forming at least two valve leaflets (133, 140, 142, 333, 340, 342, 366), each valve leaflet (133, 140, 142, 333, 340, 342, 366) having an arcuate edge (150, 152, 372) that forms a part of the second cover end, the cover extending over the second frame end so that the at least two valve leaflets reversibly obstruct the second frame end opening (134, 334), wherein when the cardiac valve is in the open valve configuration the second cover end extends a variable distance beyond the second frame end member (112, 312), and wherein when the cardiac valve is in the closed valve configuration the at least two leaflets (133, 140, 142, 333, 340, 342, 366) obstruct the second frame opening (134, 334), each leaflet (133, 140, 142, 333, 340, 342, 366) having a concave shape (156, 370) extending from the second frame end member (112, 312) to the arcuate edge (150, 152, 372), a portion of each leaflet (133, 140, 142, 333, 340, 342, 366) being positioned within the lumen (126, 326) of the support frame (102, 3 02).
