Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
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Respiratory air flow measuring technique without sensing element on the flow stream

호흡경로 상에 감지소자가 없는 새로운 호흡기류 계측기술

  • Lee, In-Kwang (Department of Biomedical Engineering, School of Medicine, Chungbuk National University) ;
  • Park, Jun-Oh (Department of Biomedical Engineering, School of Medicine, Chungbuk National University) ;
  • Lee, Su-Ok (Department of Dental Hygiene, Daejeon Health Sciences College) ;
  • Shin, Eun-Young (Department of Biochemistry, School of Medicine, Chungbuk National University) ;
  • Kim, Kyung-Chun ;
  • Kim, Kyung-Ah (Department of Biomedical Engineering, School of Medicine, Chungbuk National University) ;
  • Cha, Eun-Jong (Department of Biomedical Engineering, School of Medicine, Chungbuk National University)
  • 이인광 (충북대학교 의대 의공학교실) ;
  • 박준오 (충북대학교 의대 의공학교실) ;
  • 이수옥 (대전보건대학 치위생과) ;
  • 신은영 (충북대학교 의대 생화학교실) ;
  • 김경천 (부산대학교 공과대학 기계공학부) ;
  • 김경아 (충북대학교 의대 의공학교실) ;
  • 차은종 (충북대학교 의대 의공학교실)
  • Published : 2009.07.31
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Abstract

Cardiopulmonary resuscitation(CPR) is performed by artificial ventilation and thoracic compression for the patient under emergent situation to maintain at least the minimum level of respiration and blood circulation for life survival. Quality of the pre-hospital CPR not only significantly affects the patient's survival rate but also minimizes side effects caused by CPR. Good quality CPR requires monitoring respiration, however, traditional respiratory air flow transducers cannot be used because the transducer elements are located on the flow axis. The present study developed a new technique with no physical object on the flow stream but enabling the air flow measurement and easily incorporated with the CPR devices. A turbulence chamber was formed in the middle of the respiratory tube by locally enlarging the cross-sectional area where the flow related turbulence was generated inducing energy loss which was in turn converted into pressure difference. The turbulence chamber was simply an empty enlarged air space, thus no physical object was placed on the flow stream, but still the flow rate could be evaluated. Both inspiratory and expiratory flows were obtained with symmetric measurement characteristics. Quadratic curve fitting provided excellent calibration formula with a correlation coefficient>0.999 (P<0.0001) and the mean relative error<1 %. The present results can be usefully applied to accurately monitor the air flow rate during CPR.

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References

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