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Oxygen consumption meter

  • US 4,917,108 A
  • Filed: 06/29/1988
  • Issued: 04/17/1990
  • Est. Priority Date: 06/29/1988
  • Status: Expired due to Term
First Claim
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1. An indirect calorimeter operative to measure the respiratory oxygen consumption per unit time of a subject, comprising:

  • a respiratory connector operative to be supported in contact with the subject so as to pass respiratory gases as the subject breathes into said respiratory connector;

    a scrubber having a gas inlet and a gas outlet and being operative to absorb carbon dioxide from said gases passing between its inlet and outlet;

    flow meter means operatively connected to said respiratory connector and operative to generate signals as a function of the gas volume of said gases passed through such meter means;

    valves and conduits interconnecting said respiratory connector, scrubber, and flow meter means, operative upon the subject inhaling to cause the gas to pass through the scrubber, then through the flow meter means, and then to the subjects respiratory system through the respiratory connector, and upon the subject exhaling to pass the exhaled gas from the respiratory connector first through scrubber, then through the flow meter means; and

    means for receiving the resultant signals from the flow meter means and for generating a signal proportional to the integral of the differences between inhaled and exhaled gas volumes over a period of time.

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