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Tissue Variability and Antennas for Power Transfer to Wireless Implantable Medical Devices.

Kara N Bocan1, Marlin H Mickle1, Ervin Sejdic1

  • 1Department of Electrical and Computer EngineeringUniversity of Pittsburgh.

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Summary

This study evaluated printed antenna designs for wireless power transfer to medical implants. A loop antenna offers high gain with a small size, while a dipole antenna provides better performance at greater depths and is less sensitive to tissue variations.

Keywords:
Wireless power transferantennasimplantable medical devicestissue dielectric propertiestranscutaneous energy transfer

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Area of Science:

  • Biomedical Engineering
  • Electromagnetics
  • Medical Device Technology

Background:

  • Transcutaneous power transfer is crucial for implantable medical devices.
  • Tissue property variations necessitate robust antenna designs.
  • Printed antenna topologies offer a low-cost solution.

Purpose of the Study:

  • Design and evaluate printed antenna topologies for ultrahigh frequency (UHF) transcutaneous power transfer.
  • Investigate the impact of tissue property variations on dipole and loop antenna performance.
  • Compare the trade-offs between loop and dipole antenna systems for implantable devices.

Main Methods:

  • Simulated and evaluated several printed antenna topologies, including dipole and loop designs.
  • Analyzed antenna performance under varying tissue characteristics (e.g., dielectric properties, conductivity).
  • Assessed antenna gain, impedance matching, and sensitivity to environmental changes.

Main Results:

  • Loop antennas provide higher gain with smaller implanted sizes but are more sensitive to tissue variations.
  • Dipole antennas offer higher impedance for matching and increased gain with larger external antennas.
  • Dipole antennas achieve higher gain at greater depths and demonstrate lower sensitivity to tissue property changes compared to loop antennas.

Conclusions:

  • Both loop and dipole printed antennas show potential for UHF transcutaneous power transfer.
  • Antenna topology selection must consider implant depth, desired gain, and expected tissue variations.
  • Environmental factors significantly influence the choice of antenna for reliable wireless power delivery to medical implants.