#$%^&*AU2013200786A120130307.pdf#####13 ABSTRACT A blood pump comprising a housing containing an impeller and an ultrasound sensor mounted within the housing. The ultrasound sensor is oriented within the housing in such 5 a manner as to provide an unobstructed view of an inflow cannula for transmitting acoustic pulses into, and receiving reflected ultrasonic echoes from the inflow cannula for determining the pumping state of the pump.-212436 51 45 -- Ultrasonic Sensor 47 Pump -27- 52 44 53 56 Implanted External Battery IController 46 Extemal Power Extrna S source I onitrn I I Device 54 55 Fig. 2