strain load like with the cv stent valve 10 it is preferable to couple sections of the valve flaps 28 along a longitudinal seam 29 to the inner graft member 11 b and the outer graft member 11 a at points equidistant from the valve arms 24 in order to impart a more cusp like structure to the valve flaps 28 turning to fig1 a and b there is illustrated the inventive cc stent valve 40 implanted in the position of the mitral valve and excluding the anatomic mitral valve mv fig1 a illustrates the heart during atrial systole in which a positive pressure is applied to the prosthetic mitral valve by contraction of the left atrium la and the pressure exerted by the blood flow represented by the arrow the atrial systolic pressure overcomes the bias exerted by the valve arms 24 onto the valve leaflets 26 and causes the valve leaflets 26 to open and release the atrial ejection fraction into the left ventricle fig1 b illustrates that the presence of a negative pressure head across the stent valve 40 i e such as that during atrial diastole causes the biased valve leaflets 26 which are already closed to further close and prevent backflow from the left ventricle into the left atrium in accordance with another preferred embodiment of the invention the cc configuration may be adapted for use in repairing septal defects by simply substituting a membrane for the valve leaflets 26 the lumen of the stent body member 12 is occluded the cc stent valve 40 may be delivered.