와류 현상을 이용하는 호흡기류센서
Respiratory air Flow Transducer Based on air Turbulence
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초록
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 ±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.
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 ±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.
참고문헌 (18)
- E.J. Cha, "Measurements of the respiratory system. in : Medical instrumentation: Application and design", pp.509~598 (1993), Translated by the BME education consortium
- C.H. Buess, "Pneumotachometers. in : Encyclopedia of medical devices and instrumentation", pp.2319~2324 (1988), John Wiley & Sons
- Micro Medical Ltd, "MicroLab Operating Manual", pp.2~4 (1998), Micro Medical Ltd
- K.A. Kim, "Functional disposable use flow tube converting the respiratory air flow rate into averaged dynamic pressure", J. Sensors Soc, 11(3), pp.125~131 (2002)
- A. Hald, "Computerized hot-wire anemometry- Principles of calculation", Computer Programs in Biomedicine, 11(2), pp.113~118 (1980)
- R.M. Olson, "Flow measurements. in : Essentials of engineering fluid mechanics 4th ed", pp.452~482 (1980), Maple Press Company
- S.O. Hwang, "Cardiopulmonary resuscitation. in : Cardiopulmonary resuscitation and advanced cardiovascular life support", pp.13~25 (2005), Koonja
- S.O. Hwang, "Basic resuscitation. in : Cardiopulmonary resuscitation and advanced cardiovascular life support", pp.27~62 (2005), Koonja
- "Korean Association of Cardiopulmonary Resuscitation, Guidelines of cardiopulmonary resuscitation, Seoul, Korea: Korean Association of Cardiopulmonary Resuscitation", 1~18 (2007)
- J.C. Shin, "Flow in tube. in : Hydrodynamics", pp.269~314 (2000), Kuminsa
- A. Fleisch, "Der pneumotachography: ein Apparatzur Beischw- indgkeitregstrierung der Atemluft", Arch. Ges. Physiol, 209, pp.713~722 (1925)
- F. Rohrer, "Physiologie der atembewegung. in : Handbuch der Normalen und Pathologischen Physiologie", pp.70~127 (1925), Springer-Verlag
- American Thoracic Society, "Standardization of spirometry", Am. J. Respir. Crit. Care Med, 152, pp.1107~1136 (1995)
- B.S. Abella, "Quality of cardiopulmonary resuscitation during out-of-hospital cardiac arrest", JAMA, 293(3), pp.305~310 (2005)
- American Heart Association, "Guidelines for Cardiopulmonary Resuscitation Emergency Cardiovascular Care", Circulation, 102(1), pp.I1~I384 (2000)
- K. Konno, "Measurement of the separate volume changes of rib cage and abdomen during breathing", J. Appl. Physiol, 22(3), pp.407~422 (1967)
- K.A. Kim, "Characteristics of conductive rubber belt on the abdomen to monitor respiration", J. Sensors Soc, 16(1), pp.32~ (2007)
- I.K Lee, "Wearable wireless respiratory monitoring system", J. Sensors Soc, 17(2), pp.133~142 (2008)