An implant device for a heart having a first chamber and a second chamber and a native valve between the chambers, the device having an elongate body having opposing ends, the body being configured to be implanted within the heart and extend through the native valve with a first end in the first chamber and a second end in the second chamber a first resiliently compressible part of the body being adapted to be compressively engaged by the heart within the first chamber and a second resiliently compressible part of the body being adapted to be compressively engaged by the heart within the second chamber so that the first and second parts hold the elongate body in a desired position within the heart by said compressive engagement. The device can be employed as a prosthetic device replace or supplement a native valve such as the mitral valve.
