Blood perfusion cooling effects in transcutaneous energy transfer systems for driving next generation heart pumps

OJ Escalona, Antonio Bosnjak, Mohammad Karim, Paul Crawford, David McEneaney, James McLaughlin

Research output: Contribution to conferencePaperpeer-review

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Abstract

This work focuses on developing Transcutaneous Energy Transfer Systems (TETS) to power wirelessly the next generation of artificial heart pumps, particularly Left-Ventricular Assist Devices (LVADs). Conventional TETS use inductive coupling for transferring relatively high-power across the skin but are associated with significant skin heating effects. Thus, TETS design requires to minimise skin-tissue thermal damage. We have developed a multi-channels TETS capable of transferring up to 16W utilizing pulsed transmission waveform protocols for mitigating skin heating effects. A dual-channel inductively coupled RF power transmission prototype (inhouse built), for wireless power delivery to a resistive LVAD model (50Ω), capable of providing both continuous and the pulsed RF-transmission modes. Adjustable RF-transmission pulse duration ranges from 30ms to 480ms, and idle time (no-transmission) from 5s to 120s. Experimental results of estimated skin tissue thermal profile heating coefficient for the in-vivo (alive) pig model, both pulsed and continuous transmission modes were 7.74x10-4±(2.59x10-4) ºC/s and 1.28x10-3±(3.73x10-4) ºC/s respectively, and in the cadaver pig model (placebo), for pulsed and continuous modes: 1.59x10-3±(6.11x10-4) ºC/s & 1.46x10-3±(3.3x10-4) ºC/s respectively. In conclusion, the blood thermal perfusion plays a vital cooling role to reduce skin-tissue damage in TETS. The results analysis of in-vivo (alive-model) and placebo (cadaver-model) studies confirmed that tissue heating effect was significantly lower in the living-model (versus cadaver-model) due to presence of blood perfusion cooling effects.
Original languageEnglish
Number of pages9
Publication statusAccepted/In press - 22 Feb 2022
EventIUPESM World Congress on Medical Physics and Biomedical Engineering - Singapore, Singapore, Singapore
Duration: 12 Jun 202217 Jun 2022

Conference

ConferenceIUPESM World Congress on Medical Physics and Biomedical Engineering
Country/TerritorySingapore
CitySingapore
Period12/06/2217/06/22

Keywords

  • Transcutaneous wireless power supply
  • medical implants
  • artificial hearts
  • LVAD driveline infection
  • skin pulsed heating
  • subcutaneous thermal profile
  • TWESMI concept
  • cadaver model
  • porcine model
  • Galvani concept

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