A heart valve leaflet replacement system for a diseased heart valve including a replacement valve that is configured to be selectively guided and implanted in a native annulus of the diseased heart valve. The replacement valve can include: a frame with a rigid portion to house and maintain the integrity of the replacement leaflets and a flexible portion enabling it to conform to the native vessel geometry, at least one prosthetic leaflet coupled to an inner surface of the stent, and a plurality of prong structures operatively coupled to and extending between portions of the at least one prosthetic leaflet and the inner surface of the bottom ventricular portion of the stent to selectively constrain the movement of the at least one prosthetic valve relative to the bottom ventricular portion of the stent.
