대한의용생체공학회:의공학회지 (Journal of Biomedical Engineering Research)

  • 제36권4호
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  • Pages.115-122
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  • 2015
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  • 1229-0807(pISSN)
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  • 2288-9396(eISSN)
대한의용생체공학회 (The Korean Society of Medical and Biological Engineering)
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호흡기류 계측모듈의 교정과 성능 비교를 위한 실용적인 표준기류 생성 시스템

A Practical standard Air Flow Generator System to Calibrate and Compare Performance of Two Different Respiratory Air Flow Measurement Modules

  • 이인광 (충북대학교 의과대학 의공학교실) ;
  • 박미정 (충북대학교 의과대학 의공학교실) ;
  • 이상봉 (충북대학교 의과대학 의공학교실) ;
  • 김경옥 (우송정보대학 간호과) ;
  • 차은종 (충북대학교 의과대학 의공학교실) ;
  • 김경아 (충북대학교 의과대학 의공학교실)
  • Lee, In-Kwang (Department of Biomedical Engineering, College of Medicine, Chungbuk National University) ;
  • Park, Mi-Jung (Department of Biomedical Engineering, College of Medicine, Chungbuk National University) ;
  • Lee, Sang-Bong (Department of Biomedical Engineering, College of Medicine, Chungbuk National University) ;
  • Kim, Kyoung-Ok (Department of Nursing, Woosong College) ;
  • Cha, Eun-Jong (Department of Biomedical Engineering, College of Medicine, Chungbuk National University) ;
  • Kim, Kyung-Ah (Department of Biomedical Engineering, College of Medicine, Chungbuk National University)
  • 투고 : 2015.07.31
  • 심사 : 2015.08.20
  • 발행 : 2015.08.30
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초록

A standard air flow generator system was developed to generate air flows of various levels simultaneously applied to two different air flow transducer modules. Axes of two identical standard syringes for spirometer calibration were connected with each other and driven by a servo-motor. Linear displacement transducer was also connected to the syringe axis to accurately acquire the volume change signal. The user can select either sinusoidal or square waveform of volume change and manually input any volume as well as maximal flow rate levels ranging 0~3 l and 0~15 l/s, respectively. Various volume and flow levels were input to operate the system, then the volume signal was acquired followed by numerical differentiation to obtain the air flow signal. The measured volumes and maximal air flow rates were compared with the user input data. The relative errors between the user-input and the measured stroke volumes were all within 0.5%, demonstrating very accurate driving of the system. In case of the maximal flow rate, relatively large error was observed when the syringe was driven very fast within a very short time duration. However, except for these few data, most measured flow rates revealed relative errors of approximately 2%. When the measure and user-input stroke volume and maximal flow rate data were analyzed by linear regression analysis, respectively, the correlation coefficients were satisfactorily higher than 0.99 (p < 0.0001). These results demonstrate that the servo-motor controls the syringes with enough accuracy to generate standard air flows. Therefore, the present system would be very much practical for calibration process as well as performance evaluation and comparison of two different air flow transducer modules.

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참고문헌

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