Progress in Superconductivity and Cryogenics (한국초전도ㆍ저온공학회논문지)

The Korean Society of Superconductivity and Cryogenics (한국초전도저온학회)
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Development of the closed-loop Joule-Thomson cryoablation device for long area cooling

  • Lee, Cheonkyu (Cryogenic Engineering Laboratory, Korea Advanced Institute of Science and Technology) ;
  • Park, Inmyong (Cryogenic Engineering Laboratory, Korea Advanced Institute of Science and Technology) ;
  • Yoo, Donggyu (Cryogenic Engineering Laboratory, Korea Advanced Institute of Science and Technology) ;
  • Jeong, Sangkwon (Cryogenic Engineering Laboratory, Korea Advanced Institute of Science and Technology) ;
  • Park, Sang Woo (Konkuk University Hospital, School of Medicine, Konkuk University)
  • Received : 2013.08.21
  • Accepted : 2013.09.26
  • Published : 2013.09.30
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Abstract

Cryoablation device is a surgical instrument to produce the cooling effect to destroy detrimental biological tissue by utilizing low temperature around 110 K. Usually, this device has the concentrated cooling region, so that it is suitable for concentrated and thick target. Accordingly, it is hard to apply this device for the target which is distributed and thin target. In this study, the design procedure of a closed-loop cryoablation device with multiple J-T expansion part is developed for the treatment of incompetent of great saphenous vein. The developed cyoablation device is designed with the analysis of 1-dimensional (1-D) bio-heat equation. The energy balance is considered to determine the minimum mass flow rate of refrigerant for consecutive flow boiling to develop the uniform cooling temperature. Azeotropic mixed refrigerant R410A and zeotropic mixed refrigerant (MR) of R22 ($CHClF_2$) and R23 ($CHF_3$) are utilized as operating fluids of the developed cryoablation device to form the sufficient temperature and to verify the quality of the inside of cryoablation probe. The experimental results of R410A and the zeotropic MR show the temperature non-uniformity over the range are $244.8K{\pm}2.7K$ and $239.8K{\pm}4.7K$ respectively. The experimental results demonstrate that the probe experiences the consecutive flow boiling over the target range of 200 mm.

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