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Development of a thermodynamic control system for the Fontan circulation pulsation device using shape memory alloy fibers

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  • Artificial Heart (Basic)
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Abstract

The Fontan procedure is one of the common surgical treatments for circulatory reconstruction in pediatric patients with congenital heart disease. In Fontan circulation, low pulsatility may induce localized lung ischemia and may impair the development of pulmonary peripheral endothelial cells. To promote pulmonary circulation in Fontan circulation, we have been developing a pediatric pulmonary circulatory pulsation device using shape memory alloy fibers attached from the outside of total cavopulmonary connection. In this study, we developed a new thermal control system for the device and examined its functions. We mounted on the device 16 fibers connected in parallel around an ePTFE graft circumferentially. To provide optimized contraction, we designed the new thermal control system. The system consisted of a thermistor, a pressure sensor, and a regulator that was controlled by the adaptive thermodynamic transfer functions. We monitored the parameters and calculated heat transfer function as well as pressure distribution on the graft surface. Then we examined and compared the dynamic contractile pressure and changes in surface temperature. As a result, by the application of the control based on the new feedback system analysis, the circumferential contractile pressure increased by 35 %. The adaptive thermodynamic regulation was useful for the selection of alternative thresholds of the surface temperature of the graft. The system could achieve effective contraction for the pulsatile flow generation by the device.

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Acknowledgments

This work was supported by JSPS KAKENHI Grant Number 25282126, 26560199, and JSPS Fellows Grant Number 26·6949. 

Conflict of interest

The authors declare that they have no conflict of interest.

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Authors and Affiliations

  1. Graduate School of Biomedical Engineering, Tohoku University, Sendai, Japan

    Akihiro Yamada, Yusuke Tsuboko & Tomoyuki Yambe

  2. Department of Medical Engineering and Cardiology, Institute of Development, Aging and Cancer, Tohoku University, Seiryo-machi 4-1, Aoba-ku, Sendai, 980-8575, Japan

    Akihiro Yamada, Yasuyuki Shiraishi, Hidekazu Miura & Tomoyuki Yambe

  3. Graduate School of Medicine, Tohoku University, Sendai, Japan

    Hashem Mohamed Omran Hashem

  4. Pediatric Cardiovascular Surgery, Kyoto Prefectural University of Medicine, Kyoto, Japan

    Masaaki Yamagishi

Authors
  1. Akihiro Yamada
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  2. Yasuyuki Shiraishi
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  3. Hidekazu Miura
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  4. Hashem Mohamed Omran Hashem
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  5. Yusuke Tsuboko
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  6. Masaaki Yamagishi
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  7. Tomoyuki Yambe
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Correspondence to Yasuyuki Shiraishi or Tomoyuki Yambe.

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Yamada, A., Shiraishi, Y., Miura, H. et al. Development of a thermodynamic control system for the Fontan circulation pulsation device using shape memory alloy fibers. J Artif Organs 18, 199–205 (2015). https://doi.org/10.1007/s10047-015-0827-z

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  • DOI: https://doi.org/10.1007/s10047-015-0827-z

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