Wireless energy transfer with variable size resonators for medical applications

  • US 8,907,531 B2
  • Filed: 10/21/2011
  • Issued: 12/09/2014
  • 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, the 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 an implantable medical device using electrical power, wherein the load has an associated lossy object; and

    a second electromagnetic resonator adapted to be integrated with the implantable 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 the second electromagnetic resonator is configured to tailor electromagnetic fields with respect to the lossy object; and

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

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