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Related Experiment Videos

Wireless power transfer to deep-tissue microimplants.

John S Ho1, Alexander J Yeh2, Evgenios Neofytou3

  • 1Departments of Electrical Engineering and adapoon@stanford.edu.

Proceedings of the National Academy of Sciences of the United States of America
|May 21, 2014
PubMed
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Researchers developed a new "midfield powering" method to wirelessly power tiny medical microimplants deep inside the body. This breakthrough overcomes previous limitations, enabling smaller, safer, and more effective implantable electronic systems.

Area of Science:

  • Biomedical Engineering
  • Implantable Electronic Devices
  • Wireless Power Transfer

Background:

  • Miniaturization of electronic systems for medical implants has advanced significantly.
  • Powering microimplants, especially deep within tissue, remains a major challenge for current wireless technologies.
  • Existing wireless power transfer methods are limited by coil size and energy decay over distance.

Purpose of the Study:

  • To overcome the limitations of current wireless powering for deep-tissue microimplants.
  • To demonstrate a novel method for efficient energy transfer to small implantable devices.
  • To enable the development of next-generation, minimally invasive implantable electronic systems.

Main Methods:

  • Introduced a "midfield powering" technique using a patterned metal plate for energy transport.
Keywords:
biomedical electronicsmicrostimulator

Related Experiment Videos

  • Utilized spatially confined and adaptive energy transport through propagating modes in tissue.
  • Developed and tested a 2 mm, 70 mg microimplant for wireless cardiac control.

    • Main Results:

    • Achieved high-energy density region deep within tissue (>5 cm) for microimplant operation.
    • Successfully powered a microimplant wirelessly for complex functions and physiological stimulation.
    • Demonstrated milliwatt power transfer at exposure levels below human safety thresholds.

    Conclusions:

    • The midfield powering method effectively overcomes limitations of conventional wireless power transfer for deep-tissue microimplants.
    • This technology enables the creation of significantly smaller and less invasive implantable electronic systems.
    • The approach promises to reduce the cost and risk associated with future medical implantations.