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Numerical estimation of heat distribution from the implantable battery system of an undulation pump LVAD

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Abstract

We have been developing an implantable battery system using three series-connected lithium ion batteries having an energy capacity of 1800 mAh to drive an undulation pump left ventricular assist device. However, the lithium ion battery undergoes an exothermic reaction during the discharge phase, and the temperature rise of the lithium ion battery is a critical issue for implantation usage. Heat generation in the lithium ion battery depends on the intensity of the discharge current, and we obtained a relationship between the heat flow from the lithium ion battery qc(I) and the intensity of the discharge current I as qc(I) = 0.63 × I (W) in in vitro experiments. The temperature distribution of the implantable battery system was estimated by means of three-dimentional finite-element method (FEM) heat transfer analysis using the heat flow function qc(I), and we also measured the temperature rise of the implantable battery system in in vitro experiments to conduct verification of the estimation. The maximum temperatures of the lithium ion battery and the implantable battery case were measured as 52.2°C and 41.1°C, respectively. The estimated result of temperature distribution of the implantable battery system agreed well with the measured results using thermography. In conclusion, FEM heat transfer analysis is promising as a tool to estimate the temperature of the implantable lithium ion battery system under any pump current without the need for animal experiments, and it is a convenient tool for optimization of heat transfer characteristics of the implantable battery system.

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Authors and Affiliations

  1. School of Engineering, Hokkaido Tokai University, 5-1-1-1 Minami-sawa, Minami-ku, Sapporo, 005-8601, Japan

    Eiji Okamoto PhD, Tsutomu Makino PhD, Masatoshi Nakamura MS & Shuji Tanaka BS

  2. Research Center for Advanced Science, University of Tokyo, Tokyo, Japan

    Tsuneo Chinzei MD, PhD, Takashi Isoyama PhD & Itsuro Saito PhD

  3. Graduate School of Medicine, University of Tokyo, Tokyo, Japan

    Yusuke Abe MD, PhD & Shu-ichi Mochizuki MD, PhD

  4. Biomedical Engineering Organization, Tohoku University, Sendai, Japan

    Kou Imachi PhD

  5. Graduate School of Information Science, Hokkaido University, Sapporo, Japan

    Yusuke Inoue BS & Yoshinori Mitamura PhD

Authors
  1. Eiji Okamoto PhD
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  2. Tsutomu Makino PhD
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  3. Masatoshi Nakamura MS
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  4. Shuji Tanaka BS
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  5. Tsuneo Chinzei MD, PhD
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  6. Yusuke Abe MD, PhD
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  7. Takashi Isoyama PhD
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  8. Itsuro Saito PhD
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  9. Shu-ichi Mochizuki MD, PhD
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  10. Kou Imachi PhD
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  11. Yusuke Inoue BS
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  12. Yoshinori Mitamura PhD
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Corresponding author

Correspondence to Eiji Okamoto PhD.

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Okamoto, E., Makino, T., Nakamura, M. et al. Numerical estimation of heat distribution from the implantable battery system of an undulation pump LVAD. J Artif Organs 9, 77–83 (2006). https://doi.org/10.1007/s10047-006-0330-7

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  • DOI: https://doi.org/10.1007/s10047-006-0330-7

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