Resonant power transfer systems with communications
Methods and apparatus for wireless power transfer and communications are provided. In one embodiment, a wireless power transfer system comprises a transmit resonator configured to transmit wireless power, a receive resonator configured to receive the transmitted wireless power from the transmit resonator, a medical device configured to receive power from the receive resonator, a controller configured to change an operating parameter of the medical device resulting in a change to a sonic signature of the medical device, and a listening device configured to determine an intended communication from the implanted medical device or the implanted receive resonator based on the change to the sonic signature coming from the implanted medical device.
1. A wireless power transfer system, comprising:
a transmit resonator configured to transmit wireless power;
an implanted receive resonator implanted in a patient and configured to receive the transmitted wireless power from the transmit resonator;
an implanted medical device implanted in the patient and configured to receive power from the implanted receive resonator;
a controller configured to:
determine an intended communication indicating a power level of the implanted medical device; and
deliberately change an operating parameter of the implanted medical device to cause a change in a sonic signature generated by the implanted medical device in order to convey the intended communication to an external user interface device; and
the external user interface device including a microphone, the external user interface device configured to:
detect the change in the sonic signature using the microphone; and
determine, based on the change in the sonic signature, the power level of the implanted medical device indicated by the intended communication.
2. The system of claim 1 wherein the external user interface device further comprises a display configured to display information relating to the power level of the implanted medical device.
3. The system of claim 1 wherein the external user interface device is wearable.
4. The system of claim 3 wherein the external user interface device is affixed to a wrist strap.
5. The system of claim 3 wherein the external user interface device is affixed to a belt.
6. The system of claim 1 , wherein the intended communication includes an alert.
7. The system of claim 1 , wherein the implanted medical device comprises a left ventricular assist device.
8. The system of claim 7 , wherein to deliberately change an operating parameter, the controller is configured to deliberately change a speed of a pump of the left ventricular assist device.
9. The system of claim 1 , wherein to deliberately change an operating parameter, the controller is configured to deliberately introduce a harmonic into a drive signal of the implanted medical device.
10. A method of transmitting wireless power and communications, comprising:
transmitting wireless power from an external transmit resonator to an implanted receive resonator that is implanted in a patient;
receiving wireless power with the implanted receive resonator;
powering an implanted medical device implanted in the patient with the received power;
determining, using a controller, an intended communication indicating a power level of the implanted medical device;
deliberately changing, using the controller, an operating parameter of the implanted medical device to cause a change in a sonic signature of the implanted medical device in order to convey the intended communication to an external user interface device;
detecting, using a microphone of the external user interface device, the change in the sonic signature; and
determining, using the external user interface device, the power level of the implanted medical device indicated by the intended communication based on the change in the sonic signature.
11. The method of claim 10 further comprising displaying information relating to the power level of the implanted medical device to a user on the external user interface device.