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http://dx.doi.org/10.9718/JBER.2009.30.5.393

Respiratory air Flow Transducer Based on air Turbulence  

Kim, Kyung-Ah (Department of Biomedical Engineering, School of Medicine, Chungbuk National University)
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, Yoon-Kee (School of Mechanical Engineering, Pusan National University)
Kim, Kyung-Chun (School of Mechanical Engineering, Pusan National University)
Cha, Eun-Jong (Department of Biomedical Engineering, School of Medicine, Chungbuk National University)
Publication Information
Journal of Biomedical Engineering Research / v.30, no.5, 2009 , pp. 393-400 More about this Journal
Abstract
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 devices for cardiopulmonary resuscitation(CPR) procedure. 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 existed on the flow stream, but still the flow rate could be evaluated. Computer simulation demonstrated stable turbulence formation big enough to measure. Experiment was followed on the proto-type transducer, the results of which were within ${\pm}5%$ error compared to the simulation data. 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.
Keywords
Cardiopulmonary resuscitation; Respiratory air flow rate transducer; Turbulence chamber;
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Times Cited By KSCI : 3  (Citation Analysis)
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