Journal of the Korean Society of Radiology (한국방사선학회논문지)

The Korean Society of Radiology (한국방사선학회)
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Accuracy Evaluation of Respiratory Air Flow Transducer for Artificial Ventilation

인공호흡시 호흡기류 계측 센서의 정확도 평가

  • Lee, In-Kwang (Department of Biomedical Engineering, School of Medicine, Chungbuk National University) ;
  • Park, Mi-Jung (Department of Biomedical Engineering, School of Medicine, Chungbuk National University) ;
  • Kim, Kyoung-Ok (Department of Nursing, Woosong College) ;
  • Shin, Eun-Young (Department of Biochemistry, School of Medicine, Chungbuk National University) ;
  • Shon, Ho-Sun (Database/Bioinformatics, Department of Software Engineering, Chungbuk National University) ;
  • Cha, Eun-Jong (Department of Biomedical Engineering, School of Medicine, Chungbuk National University) ;
  • Kim, Kyung-Ah (Department of Biomedical Engineering, School of Medicine, Chungbuk National University)
  • 이인광 (충북대학교 의과대학 의공학교실) ;
  • 박미정 (충북대학교 의과대학 의공학교실) ;
  • 김경옥 (우송정보대학 간호과) ;
  • 신은영 (충북대학교 의과대학 생화학교실) ;
  • 손호선 (충북대학교 소프트웨어공학과 데이터베이스 & 바이오인포메틱스 연구실) ;
  • 차은종 (충북대학교 의과대학 의공학교실) ;
  • 김경아 (충북대학교 의과대학 의공학교실)
  • Received : 2015.08.23
  • Accepted : 2015.12.25
  • Published : 2015.12.31
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Abstract

Measurement accuracy was evaluated for the respiratory air flow transducer developed for applications under emergent situations. Pressure-Flow calibration equation was obtained by acquisition of air flow signals from the transducer in response to 6 flow waveforms, similar to those of artificial ventilation, generated by the standard flow generator system. Tidal volume and maximal flow rate were calculated on the flow signal then compared with the error-free data obtained by the linear displacement transducer of the flow generator system. Mean relative error of the tidal volume was within 3% and that of the maximal flow rate, approximately 5%, demonstrating accurate enough measurements. Therefore, the transducer could be applied to emergent situations to monitor the respiratory air flow signal as well as diagnostic parameters in real time.

응급상황에서 중환자에게 시행되는 인공호흡 과정 중 호흡기류를 측정할 수 있도록 개발된 센서의 계측 정확도를 평가하였다. 호흡기류 센서의 압력-기류 특성식을 산출하였으며, 인공호흡시에 인가되는 호흡기류신호와 유사한 6가지 파형을 표준기류생성시스템으로 생성하여 호흡기류 센서에 가하면서 기류신호를 측정하였다. 이 기류신호로부터 일회호흡용적과 최대기류값을 산출하였으며, 이를 표준기류생성시스템에 부착되어 있고 물리적으로 오차가 없는 선형변위센서로부터 측정한 용적신호에서 산출한 표준값과 비교하였다. 일회호흡용적의 상대오차는 3% 이내이었으며, 최대기류값은 약 5% 정도로서 충분히 정확한 기류 계측이 가능함을 확인하였다. 따라서 실제 응급상황에서 호흡기류 센서로 적용하여 응급 중환자의 호흡신호와 호흡주기별 진단변수들을 실시간으로 모니터링 할 수 있는 시스템에 활용 가능할 것으로 사료된다.

Keywords

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