heart valves is 1 complicated due to the dynamic and transient nature of cardiac pulsation and 2 time sensitive because any failure of these flow regulating passive devices will present life threatening consequences the present invention is based on the utilization of noninvasive remote ultrasound radiation for the low frequency acoustic stimulation of the implants to determine the possible existence of faults by measuring their acoustic signatures and comparing with the signature of intact outlet strut generally it is well known in the art that many mechanical structures especially those characterized by distinguished vibratory shapes and materials manifest acoustic natural resonances at particular frequencies which can serve as their acoustic signatures 22 23 the classical example is the tuning fork which serves as a standard calibration frequency for musicians and other applications the acoustic signature is strongly dependent on the structure material strain coefficients and the submerging environment of the implants 18 21 these resonances can be experimentally measured by the excitation of the modes of vibrations and listening to the radiated acoustic waves by known listening instrumentations like our ears microphones accelerometers etc additionally such acoustic resonances can be theoretically predicted using different computer programs like the finite elements method 30 it is also well known in.