Journal of Biomedical Engineering Research (대한의용생체공학회:의공학회지)

The Korean Society of Medical and Biological Engineering (대한의용생체공학회)
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Design Criteria to Miniaturize the Single Use Functional Respiratory Air Flow Tube

  • Kim Kyung Ah (Biomedical Engineering Department, School of Medicine, Chungbuk National University) ;
  • Lee Tae Soo (Biomedical Engineering Department, School of Medicine, Chungbuk National University) ;
  • Cha Eun Jong (Biomedical Engineering Department, School of Medicine, Chungbuk National University)
  • Published : 2005.06.01
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Abstract

Respiratory tubes with a length of 35mm and diameters of 10, 15, and 20mm were made for experimental purpose, and both the static$(P_s)\;and\;dynamic(P_D)$ pressures were simultaneously measured for steady flow rates ranging 1-12//sec. Least squares analysis resulted successful fitting of $P_s\;and\;P_D$ data with quadratic equations with correlation coefficients higher than 0.99(P<0.0001). The spirometric measurement standards of the American Thoracic Society(ATS) were applied to $P_s$ data, which demonstrated the smallest tube diameter of 15mm to satisfy the ATS standards. The maximum $P_D$ value of the velocity type transducer(the functional single use respiratory air flow tube) with the diameter of 15mm was estimated to be approximately $75cmH_2O$, implying more than 7 times larger sensitivity than the widely used pneumotachometers. These results showed that the velocity type respiratory air flow transducer is a unique device accomplishing miniaturization with the sensitivity increased, thus would be of great advantage to develop portable medical devices.

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References

  1. E. J. Cha. Measurements of the respiratory system, In: Medical instrumentation: Application and design, Translated by the BME education consortium, Ryumoon-Kak, pp. 509-598, 1993
  2. A. Fleisch, 'Der pneumotachography: ein Apparatzur Beischwindgkeitregstrierung der Atemluft', Arch. Ges. Physiol. Vol. 209, pp. 713-722, 1925 https://doi.org/10.1007/BF01730956
  3. Micro Medical Ltd., MicroLab Operating Manual, pp.2-4, 1998
  4. K. A. Kim, H. S. Kim, T. S. Lee, and E. J. Cha, 'Non-uniform velocity sampling technique for respiratory air flow measurement', The 24th. Conf. kosombe, P77, 2001
  5. K. A. Kim, H. S. Kim, T. S. Lee, and E. J. Cha., 'Functional disposable use flow tube converting the respiratory air flow rate into averaged dynamic pressure', J. Sensors Soc., Vol. 11, No.3, pp. 125-131, 2002
  6. A. Greening, General principles, In: Manual of asthma management, Ed. by P. M. O'byrne, N. C. Thomson, W. B. Saunders, New York, pp.331-337, 2001
  7. S. Bellofatto, Portable peak flow meter, U. S. Patent No. 5,224,487, 1993
  8. RM Olson, Flow measurements, In: Essentials of engineering fluid mechanics. 4th. ed., Maple Press Company, Ohio University, pp.452-482, 1980
  9. American Thoracic Society, 'Standardization of spirometry', Am. J. Respir. Crit. Care Med., Vol. 152, pp. 1107-1136, 1995 https://doi.org/10.1164/ajrccm.152.3.7663792
  10. K. A. Rudolph, Pneumotach, U. S. Patent No. 5,060,655, 1991
  11. M. Eloranta, Flow resistance of air flow transducer, PCT, W099/60343, 1999
  12. R. E. Hyatt, 'Expiratory flow limitation', J. Appl. Physiol., Vol. 55, pp. 1-8, 1983
  13. K. A. Kim, T. S. Lee, and E. J. Chao 'Unequl distance sampling technique to design velocity-type respiratory air flow transducer', J. Biomed. Eng. Res., Vol. 25, No.5, pp. 351-359, 2004