Method of respiratory gas analysis using a metabolic calorimeter

  • US 6,899,684 B2
  • Filed: 06/10/2002
  • Issued: 05/31/2005
  • Est. Priority Date: 08/02/1999
  • Status: Active Grant
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First Claim
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1. A method of determining a respiratory parameter for a subject using an indirect calorimeter, comprising:

  • initializing the indirect calorimeter, wherein the indirect calorimeter includes a respiratory connector for passing inhaled and exhaled gases as the subject breathes, a flow pathway operable to receive and pass the inhaled and exhaled gases and having a flow tube within the flow pathway through which the inhaled and exhaled gases pass, a flow meter, a component gas concentration sensor, and a computation unit having a processor and a memory;

    passing the inhaled and exhaled gases through the respiratory connector, if the indirect calorimeter is initialized;

    sensing a flow volume of the inhaled and exhaled gases passing through the flow pathway, using the flow meter, and transmitting a signal representing the sensed flow volume to the computation unit;

    sensing a concentration of a predetermined component gas in at least one of the inhaled and exhaled gases passing through the flow pathway, using the component gas concentration sensor, and transmitting a signal representing the sensed concentration to the computation unit;

    determining if the subject'"'"'s breathing has reached steady state;

    calculating at least one respiratory parameter for the subject at steady state using the sensed flow volume and the sensed concentration; and

    providing the at least one respiratory parameter to the subject.

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