Patent ID: 7819916

Claim:
A blood pump system for an artificial heart comprising: a blood pump; a control unit including a first speaker and a first alarm generating section connected to the pump and to the first speaker for selectively sending a first signal or a second signal to the speaker; wherein when said pump is in an abnormal state, the first signal is generated to cause the first speaker to emit an audible sound, and wherein when the pump is in a normal state, the second signal is generated to cause the first speaker to emit an ultrasonic wave; a detector unit including: a detecting section for detecting sonic waves received from the first speaker, a determining section connected to the detecting section for determining that the control unit is in an abnormal state when no ultrasonic waves are outputted from the first speaker, or when an ultrasonic wave outputted from the first speaker is in an abnormal state, and a second alarm generating section connected to the determining section for emitting a radio signal when the determining section determines that the control unit is in an abnormal state; and a monitor device for receiving the radio signal and including a second speaker for converting the radio signal into an audible sound.