Wireless energy transfer for implantable devices

A wireless energy transfer system for powering devices implanted in a patient comprising:

• a high-Q source resonator having a first resonant frequency, the source resonator being external to the patient, coupled to a power source, and configured to generate oscillating magnetic fields,
• a high-Q device resonator having a second resonant frequency, the device resonator coupled to an implantable device requiring a supply power, the device resonator being internal to the patient, and configured to capture the oscillating magnetic fields generated by the source resonator,
• a temperature sensor, positioned to measure the temperature of the device resonator, and
• a tunable component coupled to the device resonator,
• wherein the tunable component is adjusted to detune the second resonant frequency away from the first resonant frequency in response to the measurement from the temperature sensor, and
• wherein a strength of the oscillating magnetic fields generated by the source resonator is adjusted to increase power output to maintain a level of power captured by the device resonator, thereby compensating for reduced efficiency resulting from detuning of the device resonator via the tunable component.