Patent ID: 8837096
Filing Date: 2014-09-16
Classification: A61M

Abstract:
1. A pump system comprising: an implantable pump unit having a multiphase brushless motor; an external unit including a controller and an H-bridge inverter, wherein the H-bridge inverter comprises: a fourth measured current; and a cable redundantly coupling the H-bridge inverter to the motor, wherein the cable includes a first conductor coupling the first leg to a first respective phase of the motor, a second conductor coupling the second leg to the first respective phase of the motor, a third conductor coupling the third leg to a second respective phase of the motor, and a fourth conductor coupling the fourth leg to the second respective phase of the motor; wherein the controller receives the measured currents, monitors for a fault in the first or second conductors by comparing the first and second measured currents, and monitors for a fault in the third or fourth conductors by comparing the third and fourth measured currents.