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Method and apparatus for measuring respiratory flow

  • US 4,960,118 A
  • Filed: 05/01/1989
  • Issued: 10/02/1990
  • Est. Priority Date: 05/01/1989
  • Status: Expired due to Fees
First Claim
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1. A method of measuring respiratory air flow comprising the steps ofa. measuring the rate of change of abdomen circumference using an abdominal linear piezoelectric sensor, with said piezoelectric sensor being attached to an extensible abdominal belt by means of at least on non-electrically-conductive rivet, said linear piezoelectric sensor having an electrically-conductive coating on each side thereon, which coating on one side of said linear piezoelectric sensor is removed around said rivet, to provide an electrical output;

  • b. measuring the rate of change of rib cage circumference using a rib cage linear piezoelectric sensor, with said piezoelectric sensor being attached to an extensible rib cage belt by means of at least one non-electrically-conductive rivet, said linear piezoelectric sensor having an electrically-conductive coating on each side thereon, which coating on one side of said linear piezoelectric sensor is removed around said rivet, to provide an electric output;

    c. weighting and summing the outputs of the rib cage and abdominal sensors so that the summed output represents total respiratory flow.

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