Korean Journal of Acupuncture

Society for Meridian and Acupoint (경락경혈학회)
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An Experimental Study on the Development and Possible Solution of Thermal Runaway Model of Electronic Moxibustion with System Error

전자뜸의 시스템 오류에 의한 열폭주 모델 구현 및 해결 방법에 관한 실험적 연구

  • Lee, Byung Wook (Division of Medical Classics and History, College of Korean Medicine, Dongguk University) ;
  • Oh, Yong Taek (Department of Diagnostics, College of Korean Medicine, Woosuk University) ;
  • Jang, Hansol (Department of Internal Korean Medicine, Dongguk University Bundang Oriental Medicine Hospital) ;
  • Choi, Seong-Kyeong (Department of Acupuncture & Moxibustion, Dongguk University Graduate School) ;
  • Jo, Hyo Rim (Department of Acupuncture & Moxibustion, Dongguk University Bundang Oriental Medicine Hospital) ;
  • Sung, Won-Suk (Department of Acupuncture & Moxibustion, Dongguk University Bundang Oriental Medicine Hospital) ;
  • Kim, Eun-Jung (Department of Acupuncture & Moxibustion, Dongguk University Bundang Oriental Medicine Hospital)
  • 이병욱 (동국대학교 한의과대학 원전의사학교실) ;
  • 오용택 (우석대학교 한의과대학 진단학교실) ;
  • 장한솔 (동국대학교 분당한방병원 한방내과) ;
  • 최성경 (동국대학교 한의과대학 침구과 대학원) ;
  • 조효림 (동국대학교 분당한방병원 침구과) ;
  • 성원석 (동국대학교 분당한방병원 침구과) ;
  • 김은정 (동국대학교 분당한방병원 침구과)
  • Received : 2021.10.14
  • Accepted : 2021.12.18
  • Published : 2021.12.27
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Abstract

Objectives : The purpose of this study is to construct a model of the possible thermal runaway of electronic moxibustion and to implement an appropriate risk management method. Methods : To reproduce the system error situation of the electronic moxibustion circuit equipped with microcontroller unit, temperature sensor and heater, a code was set to disable the signal input to temperature sensor and maintain "high" heating signal to heater. The temperature change of electronic moxibustion was compared between 3 types of heater module; module 1 consisting of a combination of heater+0 ohm+0 ohm resistance, module 2 consisting of a combination of heater+Polymeric Positive Temperature Coefficient (PPTC)+0 ohm resistance, and module 3 consisting of a combination of heater+PPTC+10 ohm resistance. The temperature change was measured using a polydimethylsiloxane (PDMS) silicone phantom. After maintaining surface temperature of the phantom at 31~32℃ for 20 seconds, electronic moxibustion was applied. After operating electronic moxibustion, the temperature change was measured for 660 seconds on the surface and 900 seconds at 2 mm depth. Results : Regardless of the module type, the time-dependent change in temperature showed a rapid rise followed by a gentle curve, and a sharp drop in temperature after reaching the maximum temperature about 10 minutes after the switching the moxibustion on. Temperature measured at the depth of 2 mm below the surface increased slower and to a lesser extent. Module 1 reached highest peak temperature with largest change of temperature at both depths followed by module 2, and 3. Conclusions : Through the combination of PPTC+resistance with the heater of electronic moxibustion, it is possible to limit the rise in temperature even with the software error. Thus, this setting can be used as an independent safety measure for the electronic moxibustion control unit.

Keywords

Acknowledgement

This work was supported by the Dongguk University Research Fund of 2020.

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