Coplanar Wireless Energy Transfer

• US 20140031607A1
• Filed: 09/30/2013
• Published: 01/30/2014
• Est. Priority Date: 08/19/2011
• Status: Active Grant

• Current Assignee: Leviticus Cardio Ltd.
• Original Assignee: Leviticus Cardio Ltd.
• Inventors: Zilbershlag, Michael, Plotkin, Anton
• Granted Patent: US 9,642,958 B2
• Time in Patent Office: Days
• US Class Current: 600/16
• CPC Class Codes: A61M 2205/8243 by induction
• CPC Class Codes: A61M 2209/088 on the body
• CPC Class Codes: A61M 60/148 in line with a blood vessel using resection or like techniques, e.g. permanent endovascular heart assist devices
• CPC Class Codes: A61M 60/178 drawing blood from a ventricle and returning the blood to the arterial system via a cannula external to the ventricle, e.g. left or right ventricular assist devices
• CPC Class Codes: A61M 60/508 Electronic control means, e.g. for feedback regulation
• CPC Class Codes: A61M 60/875 specially adapted for optimising alignment of external and implantable coils
• CPC Class Codes: A61N 1/37229 Shape or location of the implanted or external antenna
• CPC Class Codes: A61N 1/3787 from an external energy source
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• CPC Class Codes: H02J 2310/23 The load being a medical device, a medical implant, or a life supporting device
• CPC Class Codes: H02J 50/005 Mechanical details of housing or structure aiming to accommodate the power transfer means, e.g. mechanical integration of coils, antennas or transducers into emitting or receiving devices
• CPC Class Codes: H02J 50/12 of the resonant type

Abstract

An external transmitter inductive coil can be provided in, on, or with a belt designed to be placed externally around a part of a body of a patient. An implantable device (such as a VAD or other medical device) that is implanted within the patient'"'"'s body has associated with a receiver inductive coil that gets implanted within that part of the patient'"'"'s body along with the device. The externally-located transmitter inductive coil inductively transfers electromagnetic power into that part of the body and thus to the receiver inductive coil. The implanted receiver inductive coil thus wirelessly receives the inductively-transferred electromagnetic power, and operates the implant.

Claims

1. A system for wirelessly powering an implantable ventricular assist device (VAD), comprising:

a transmitter inductive coil configured to be disposed externally around a part of a body of a patient within which the VAD is implanted and to inductively transfer electromagnetic power into that part of the body, the transmitter inductive coil comprising a height and a radius, a ratio of the height to the radius being about 0.4 to about 1.5; and

a receiver inductive coil associated with the VAD and configured to be implanted within that part of the patient'"'"'s body along with the VAD to wirelessly receive the inductively-transferred electromagnetic power and provide that received power to the VAD.

2. The system of claim 1, wherein the transmitter inductive coil, the receiver inductive coil, or both comprise a wire configured to carry alternating currents.

3. The system of claim 2, wherein the wire comprises 100 to 600 strands with a gauge ranging from 36 AWG to 38 AWG.

4. The system of claim 3, wherein the wire of the receiver inductive coil comprises 130 to 300 strands with a gauge ranging from 36 AWG to 38 AWG.

5. The system of claim 2, wherein the wire of the transmitter inductive coil comprises 175 to 400 strands with a gauge ranging from 36 AWG to 38 AWG.

6. The system of claim 1, wherein the transmitter inductive coil comprises 6 to 35 turns of a wire.

7. The system of claim 1, the receiver inductive coil comprises 5 to 50 turns of a wire with a pitch of at least 0.05 inches between each turn.

8. The system of claim 1, wherein the transmitter inductive coil is associated with a microprocessor, and the microprocessor searches for a resonance frequency of the receiver inductive coil within a frequency range and locks the resonance frequency of the transmitter inductive coil with the resonance frequency of the receiver inductive coil.

9. The system of claim 1, wherein the frequency range is from 300 KHz to 80 KHz.

10. The system of claim 1, wherein the transmitter inductive coil is associated with a capacitor that comprises an equivalent series resistance that is less than a resistance of the transmitter inductive coil.

11. The system of claim 1, wherein the transmitter inductive coil is configured to transmit the electromagnetic power at a frequency ranging from 60 KHz to 1 MHz.

12. The system of claim 1, wherein the transmitter inductive coil is associated with a half-bridge pulse generator.

13. The system of claim 1, wherein the receiver inductive coil is associated with an AC-to-DC rectification circuit that comprises a single diode.

14. The system of claim 2, wherein the receiver inductive coil comprising 5 to 50 turns of a wire with a pitch of at least 0.05 inches between each turn.

15. The system of claim 14, wherein each of the wire turns of the receiver inductive coil is connected such that the pitch is substantially constant.

16. The system of claim 14, wherein the wire turns of the receiver inductive coil are coupled such that the pitch is variable, and the receiver inductive coil comprises a covering such that the pitch between any two wire turns is 0.05 inches or more.

17. A receiver inductive coil associated with a wirelessly-powerable implantable medical device and configured to be implanted within a part of a body of a patient along with the implantable medical device to wirelessly receive inductively-transferred electromagnetic power from external to the part of the patient'"'"'s body and provide that received power to the implanted implantable medical device, the receiver inductive coil comprising 5 to 50 turns of a wire with a pitch of at least 0.05 inches between each turn, the inductively-transferred electromagnetic power being transmitted by a transmitter inductive coil configured to be disposed externally around the part of the patient'"'"'s body within which the implantable device and its associated receiver inductive coil are implanted.

18. The receiver inductive coil of claim 17, wherein the wire is configured to carry alternating currents.

19. The receiver inductive coil of claim 18, wherein the wire comprises 100 to 600 strands with a gauge ranging from 36 AWG to 48 AWG.

20. The receiver inductive coil of claim 19, wherein the wire comprises 130 to 300 strands with a gauge ranging from 36 AWG to 48 AWG.

21. The receiver inductive coil of claim 20, wherein the wire comprises 175 strands with a gauge of 40 AWG.

22. The receiver inductive coil of claim 17, wherein the wire turns are arranged in 1 to 3 layers.

23. The receiver inductive coil of claim 17, wherein each of the wire turns of the receiver inductive coil is connected such that the pitch is substantially constant.

24. The receiver inductive coil of claim 17, wherein the wire turns of the receiver inductive coil are coupled such that the pitch is variable, and the receiver inductive coil comprises a covering such that the pitch between any two wire turns is 0.05 inches or more.

25. The receiver inductive coil of 17, wherein the receiver inductive coil is associated with an AC-to-DC rectification circuit that comprises a single diode.

26. A transmitter inductive coil configured to be disposed externally around a part of a body of a patient within which a wirelessly-powerable implantable medical device is implanted and to inductively transfer electromagnetic power into that part of the body, the transmitter inductive coil comprising a height and a radius, a ratio of the height to the radius being about 0.4 to about 1.5, the implantable medical device including a receiver inductive coil associated therewith and the implantable medical device together with the associated receiver inductive coil configured to be implanted within that part of the patient'"'"'s body to allow the implanted receiver inductive coil to wirelessly receive the inductively-transferred electromagnetic power and provide that received power to the implanted implantable medical device.

27. The transmitter inductive coil of claim 26, wherein the transmitter inductive coil comprises a wire configured to carry alternating currents.

28. The transmitter inductive coil of claim 27, wherein the wire comprises 100 to 600 strands with a gauge ranging from 36 AWG to 38 AWG.

29. The transmitter inductive coil of claim 28, wherein the wire of the transmitter inductive coil comprises 175 to 400 strands with a gauge ranging from 36 AWG to 38 AWG.

30. The transmitter inductive coil of claim 26, wherein the transmitter inductive coil comprises 6 to 35 turns of a wire.

31. The transmitter inductive coil of claim 26, wherein the transmitter inductive coil is associated with a microcontroller;

and the microcontroller searches for a resonance frequency within a frequency range and locks the frequency of the transmitter inductive coil with the resonance frequency.

32. The transmitter inductive coil of claim 31, wherein the frequency range is from 300 KHz to 80 KHz.

33. The transmitter inductive coil of claim 26, wherein the transmitter inductive coil is associated with a capacitor that comprises an equivalence series resistance that is less than a resistance of the transmitter inductive coil.

34. The transmitter inductive coil of claim 26, wherein the transmitter inductive coil is configured to transmit the electromagnetic power at a frequency ranging from 60 KHz to 1 MHz.

35. The transmitter inductive coil of claim 26, wherein the transmitter inductive coil is associated with a half-bridge pulse generator.

36. The transmitter inductive coil of claim 26, wherein the receiver inductive coil is associated with an AC-to-DC rectification circuit that comprises a single diode.