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Transcutaneous energy transfer system performance evaluation

T Mussivand1, J A Miller, P J Santerre

  • 1Cardiovascular Devices Division, University of Ottawa Heart Institute, Ontario, Canada.

Artificial Organs
|November 1, 1993
PubMed
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A transcutaneous energy transfer (TET) system offers tether-free power for implantable devices, avoiding infection risks. This system efficiently transmits power through various skin thicknesses and misalignments, proving its feasibility.

Area of Science:

  • Biomedical Engineering
  • Implantable Devices
  • Wireless Power Transfer

Background:

  • Percutaneous lines for implantable devices pose infection risks and limit mobility.
  • Transcutaneous energy transfer (TET) provides a safer, more convenient alternative for powering implanted medical devices.

Purpose of the Study:

  • To evaluate the feasibility and performance of a transcutaneous energy transfer (TET) system for powering implantable devices.
  • To assess the TET system's efficiency, range, and safety in various conditions.

Main Methods:

  • Conducted in vitro, in vivo, ex vivo, and human cadaver studies.
  • Tested power transmission across skin thicknesses (3-15 mm) and radial misalignments (up to 20 mm).
  • Evaluated system performance with an auto-tuning TET and assessed tissue effects in porcine models.

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Main Results:

  • Demonstrated efficient power transmission (60-80% efficiency, 5-70 W power demands) with minimal attenuation (10%) from metallic objects.
  • Confirmed reliable power delivery (10-25 V output, 0.5-4.0 A current demands) despite coil separation and misalignment.
  • Showed no adverse tissue effects in chronic porcine studies, with coil surface temperatures not exceeding 42°C at 40 W power delivery.

Conclusions:

  • The TET system is a viable solution for wireless power transmission to implantable devices.
  • The developed TET system overcomes challenges of skin thickness and misalignment, offering a safe and efficient power alternative.
  • TET technology enhances patient mobility and reduces infection risks associated with traditional percutaneous power sources.