Patent ID: 9707406
Date: 2017-07-18
CPC Classifications: A61N,H02J,H04B

Claim:
1. A system for transferring power from an external power transfer system (EPTS) to at least one body-implantable active device (BIAD) through a dermis layer, said system comprising: an EPTS for being disposed external to a dermis layer of a body; and a BIAD for being disposed beneath the dermis layer of the body; the EPTS including: a transmit coil; and a transmit coil driver circuit operable to drive the transmit coil with a resonant current; the BIAD including: a receive coil tuned to the resonant frequency of the transmit coil and operable to inductively receive power therefrom when in proximity thereto; a charge storage device; a charging circuit having an input to which the received power is coupled, and operable to provide on an output thereof a charging current to the charge storage device, and further operable to determine when charging is complete or no longer desired; and a de-tuning circuit coupled to the receive coil, and operable to detune the receive coil to substantially inhibit power transfer from the transmit coil to the receive coil based upon the charging determination.