Method of making and using an apparatus for a locomotive micro-implant using active electromagnetic propulsion
Described is a locomotive implant for usage within a predetermined magnetic field. In one embodiment magnetohydrodynamics is used to generate thrust with a plurality of electrodes. In another embodiment, asymmetric drag forces are used to generate thrust.
1. An apparatus for wireless power and data transfer to an implantable device operating in a biological environment, the apparatus comprising:
a wireless power transmitter operating at a power signal frequency and having one or more transmitting antennae configured to transmit a power signal modulated with data over a radio frequency (RF) carrier signal; and
a wireless power receiver having one or more receiving antennae configured to receive the transmitted power signal as a received power signal, wherein the wireless power receiver in integrated into the implantable device; wherein the implantable device further comprises:
a rectifier, a regulator, a digital controller, and a charging device that accumulates energy over time, and
a demodulator that decodes data modulated on the power signal without synchronizing to the RF carrier signal.
2. The apparatus according to claim 1 , wherein the power signal frequency has a wavelength usable in the biological environment, and the wireless power transmitter and the wireless power receiver are spaced apart by a distance in the range between wavelength/100 and wavelength*100.
3. The apparatus according to claim 1 , wherein the wireless power transmitter and the wireless power receiver include respective impedance tuning circuits that help maximize power transfer between the wireless power transmitter and wireless power receiver using simultaneous conjugate matching.
4. The apparatus according to claim 1 , wherein the implantable device does not include a battery.
5. The apparatus according to claim 4 , wherein the charging device includes a capacitor for storing energy.
6. The apparatus according to claim 5 , wherein power is supplied continuously by the transmitted power signal.
7. The apparatus according to claim 1 , wherein an adaptive loading network maintains effective matching for the one or more receiving antennae on the power receiver.
8. The apparatus according to claim 1 , wherein the data is modulated with a low-depth amplitude modulation technique.
9. The apparatus according to claim 8 , wherein a dynamic reference generator is included in the implantable device to recover an envelope from the low-depth amplitude modulation.
10. The apparatus according to claim 1 , wherein the digital controller recovers clock and data information asynchronously.
11. The apparatus according to claim 10 , wherein the asynchronous recovery occurs without a bit, symbol or other data rate clock embedded in the transmitted data.
12. The apparatus according to claim 1 , wherein the one or more receiving antennae are smaller in area than the one or more transmitting antennae.
13. The apparatus according to claim 12 , wherein the one or more receiving antennae are up to 100 times smaller in area than the one or more transmitting antennae.
14. The apparatus according to claim 1 , wherein data is transferred from the implantable device to the wireless power transmitter by varying the impedance of the one or more receiving antennae.
15. The apparatus according to claim 1 , wherein the rectifier, regulator, demodulator, and digital controller are implemented on a single integrated circuit.
16. The apparatus according to claim 1 , wherein the wireless power transmitter communicates with a plurality of implantable devices operating in the same biological environment, each of the plurality of implantable devices being independently addressable and controllable.
17. An apparatus for wireless power transmission to an implantable device operating in a biological environment, the apparatus comprising:
a wireless power transmitter operating at a power signal frequency and having one or more transmitting antennae configured to transmit a power signal over a carrier signal and a first match circuit with a tuned impedance; and
a wireless power receiver having one or more receiving antennae configured to receive the transmitted power signal as a received power signal and a second match circuit with a tuned impedance, wherein the wireless power receiver in integrated into the implantable device; and
wherein the implantable device further includes a rectifier and an adaptive loading network to compensate for varying load of the implantable device to maintain effective matching at the one or more receiving antennae.
18. The apparatus according to claim 17 , wherein the power signal frequency has a wavelength usable in the biological environment and the wireless power transmitter, and the wireless power receiver are spaced apart by a distance in the range between wavelength/100 and wavelength*100.
19. The apparatus according to claim 17 , wherein the first and second match circuits are tuned using simultaneous conjugate matching.
20. The apparatus according to claim 17 , wherein the implantable medical device includes a controller that configures the adaptive loading network.
21. The apparatus according to claim 20 , wherein the controller configures the adaptive loading network based on information transmitted from the wireless power transmitter.
22. The apparatus according to claim 17 , wherein the transmitted power signal is modulated with data, which is received by the one or more receiving antennae.
23. The apparatus according to claim 22 , wherein the data is transferred without synchronizing to a frequency of the carrier signal over which the power signal is transmitted.
24. The apparatus according to claim 17 , wherein data is transferred from the implantable device to the wireless power transmitter by varying the impedance of the one or more receiving antennae.