Journal of Clinical Monitoring

, Volume 6, Issue 4, pp 276–283

Rib cage and abdominal piezoelectric film belts to measure ventilatory airflow

  • Bernard E. Pennock

DOI: 10.1007/BF02842487

Cite this article as:
Pennock, B.E. J Clin Monitor Comput (1990) 6: 276. doi:10.1007/BF02842487


Piezoelectric film-based respiratory belts are described and tested. To the extent that a two-degree of freedom model consisting of rib cage and abdominal motion is able to assist in quantifying ventilation, the piezoelectric belts can monitor flow in a manner analogous to the monitoring of volume with two magnetometer pairs or two respiratory inductive plethysmograph belts. The piezoelectric belts are shown to measure flow linearly when compared with a screen pneumotachometer to a flow of at least 2.6 L/s. There is no phase shift between the peak flow of belts and the pneumotachometer up to a frequency of at least 9.2 Hz. During normal ventilation, 68 and 95% of the peak flows measured with the belts fall within ±10 and 20%, respectively, of the flows measured with a screen pneumotachometer.

Key Words

Measurement techniques: plethysmography Monitoring: ventilation 

Copyright information

© Little, Brown and Company 1990

Authors and Affiliations

  • Bernard E. Pennock
    • 1
  1. 1.Pulmonary DivisionAllegheny General HospitalPittsburgh

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