Abstract: A circulatory assist device for facilitating pulsatile blood flow within a subject's blood vessel is disclosed. The circulatory assist device includes a rotary component, a pulsatory component, and one or more electromagnets. The rotary component includes a driveline and one or more impellers connected to the driveline and configured to rotate with the driveline. The pulsatory component includes one or more sections configured to change diameter in response to a magnetic field applied thereto.

Abstract: Described is a device for preventing thrombosis formation on surfaces of a blood contact device. The device may first non-invasively scan the blood contact device and determines the highest risk thrombosis points. The device then, preferably starting with the highest risk location, delivers a succession of harmonic vibration signals or electromagnetic signals non-invasively so as to prevent clot formation at each stagnation high risk point of the blood contact device (e.g., harmonic resonance). This resonant vibration calibration tuning information is stored in an associated microprocessor. The signals are then delivered, based upon the stored information, in a loop from the signal generator, usually on a belt outside the patient, to each stagnation point in sequence from highest risk of thrombosis to lowest; again and again repeated.