Percutaneous Wireless Powering System for a Left Ventricular Assist Device (LVAD) with an Internal Backup Battery

This study deals with the analysis of an optimum configuration for a wireless powering system applied to a left ventricular assisted device (LVAD). The current models of LVAD are miniaturized pump that are attached directly to heart by mini-invasive technique and can be used to treat advanced heart pathologies. The pump is electrically driven by a DC brushless motor powered by an external battery connected to the motor by percutaneous driveline cable. This last is cause of many infections and should be eliminated. Aim of this work is the study of a wireless power transfer (WPT) system used to power the motor replacing the percutaneous driveline. Electrical performances, safety aspects and reliability of the system are all aspects of paramount importance. A backup battery integrated with the implanted secondary coil is also proposed. This solution permits to improve the system reliability with a minimum number of components that must be subcutaneously implanted.