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Method for respiratory tidal volume measurement

  • US 5,980,463 A
  • Filed: 11/08/1996
  • Issued: 11/09/1999
  • Est. Priority Date: 09/28/1995
  • Status: Expired due to Term
First Claim
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1. A method of obtaining respiratory tidal volume information of an animal or human from a blood pressure signal indicative of sensed variations in blood pressure of the animal or human, the method comprising the steps of:

  • signal processing, external from the animal or human, the blood pressure signal to develop an amplitude versus time waveform;

    extracting from the developed amplitude versus time waveform a sequence of selected blood pressure features derived from individual cardiac cycles of the amplitude versus time waveform over a selected time interval;

    fitting a mathematical model to the extracted sequence of selected blood pressure features to yield a fitted mathematical model;

    characterizing changes in blood pressure that occur over a respiratory cycle from the fitted mathematical model; and

    computing the respiratory tidal volume information as a function of the characterized changes in blood pressure.

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