Wireless energy transfer with variable size resonators for implanted medical devices

  • US 8,901,778 B2
  • Filed: 10/21/2011
  • Issued: 12/02/2014
  • Est. Priority Date: 09/27/2008
  • Status: Active Grant
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First Claim
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1. A medical device-powering wireless receiver for use with a first electromagnetic resonator coupled to a power supply, first electromagnetic resonator having a mode with a resonant frequency ω

  • 1, an intrinsic loss rate Γ

    1, and a first Q-factor Q1

    1/2Γ

    1, the wireless receiver comprising;

    a load configured to power the medical device using electrical power; and

    a second electromagnetic resonator adapted to be integrated with the medical device or the load, the second electromagnetic resonator having a mode with a resonant frequency ω

    2, an intrinsic loss rate Γ

    2, and a second Q-factor Q2

    2/2Γ

    2;

    wherein the second electromagnetic resonator is configured to be wirelessly coupled to the first electromagnetic resonator to provide resonant, non-radiative wireless power to the second electromagnetic resonator from the first electromagnetic resonator;

    wherein an inductive element of at least one of the electromagnetic resonators comprises a plurality of conductors;

    wherein the at least one of the electromagnetic resonators comprises a collection of switches coupled with the plurality of conductors and configured to selectively connect one or more of the plurality of conductors to vary an effective size of the at least one of the electromagnetic resonators to improve performance;

    wherein the square root of the product of the respective Q factors is greater than 100; and

    wherein the plurality of conductors comprise a series of concentric loops with decreasing radii.

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