Patent ID: 9713726
Date: 2017-07-25
CPC Classifications: A61N,H02J,H04B

Claim:
1. A system for transferring power and communicating data 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; a transmit coil driver circuit operable to drive the transmit coil with a resonant current at a resonant frequency; and an excitation circuit coupled to the transmit coil and coupled to the transmit coil driver circuit, being operable to pump energy into the transmit coil driver circuit at a predetermined time during each resonant cycle, irrespective of variations in peak 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; and a power receiving circuit coupled to the receive coil, said power receiving circuit operable to de-tune the receive coil to substantially inhibit received power transferred from the transmit coil to the receive coil, and to thereby decrease transmit coil loading and effect a corresponding change in the transmit coil peak resonant current.