Wirelessly powered medical implant for treatment of sleep-disordered breathing

A method comprising:

• receiving a time-varying magnetic flux using at least one coil of a plurality of coils implanted on or within a recipient's body, the coils having different orientations and/or positions relative to one another;
• evaluating which coil of the plurality of coils is receiving a larger fraction of the time-varying magnetic flux than are other coils of the plurality of coils;
• generating electrical power using the time-varying magnetic flux received by the coil;
• generating stimulation signals using at least some of the electrical power generated by the coil;
• and
• applying the stimulation signals to at least one muscle of the recipient's body and/or to at least one neuron configured to control the at least one muscle.

An apparatus comprising:

• at least one implantable electrode configured to apply stimulation signals to at least one muscle of a recipient and/or to at least one neuron configured to control the at least one muscle;
• a plurality of implantable RF coils having different orientations and/or positions relative to one another, the plurality of implantable RF coils configured to wirelessly receive electrical power from an external power source;
• and
• processor circuitry configured to provide at least a portion of the electrical power received by the plurality of implantable RF coils to the at least one implantable electrode and further configured to monitor which RF coil of the plurality of implantable RF coils is receiving more electrical power than are the other RF coils of the plurality of implantable RF coils, to rectify the electrical power from the RF coil, and to provide the rectified electrical power to the at least one implantable electrode.