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Wireless power delivery for retinal prostheses.

David C Ng1, Chris E Williams, Penny J Allen

  • 1Department of Broadband, Australian Research Council. david.ng@nicta.co

Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
|January 19, 2012
PubMed
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Wireless power transfer for deep body implants is challenging, especially for moving devices. An intermediate coil method improved efficiency by 11.5%, proving effective for ocular implants.

Area of Science:

  • Biomedical Engineering
  • Electrical Engineering
  • Implantable Devices

Background:

  • Powering deep-body implanted devices wirelessly presents significant challenges, particularly when the device is in motion.
  • Magnetic induction coupling is a common method for wireless power transfer, but efficiency can decrease with distance and movement.

Purpose of the Study:

  • To investigate and compare two methods of wireless power transfer using magnetic induction coupling.
  • To enhance power transfer efficiency for deep-body implanted devices, focusing on applications in the eye.

Main Methods:

  • Described two wireless power transfer methods utilizing magnetic induction coupling.
  • Method 1: Direct transmit and receive coils for power transfer.
  • Method 2: Introduced an intermediate coil pair between transmit and receive coils to improve efficiency and stability.

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Main Results:

  • The method with an intermediate coil achieved a power transfer efficiency of 11.5%.
  • The direct coil method without an intermediate coil achieved a power transfer efficiency of 8.8%.
  • Demonstrated successful wireless power delivery into an animal eye using the intermediate coil method.

Conclusions:

  • The addition of an intermediate coil significantly improves wireless power transfer efficiency for implanted devices.
  • This enhanced method is particularly suitable for powering ocular implants due to its robustness against eye movements and surgical simplicity.
  • The study successfully demonstrated wireless power delivery to an animal eye, validating the efficacy of the proposed technique.