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Ventilator/Anaesthetic system with juxtaposed CO.sub.2 meter and expired gas flow meter

  • US 5,720,277 A
  • Filed: 02/26/1996
  • Issued: 02/24/1998
  • Est. Priority Date: 02/27/1995
  • Status: Expired due to Fees
First Claim
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1. A ventilator/anaesthetic system comprising:

  • a ventilator/anaesthetic unit;

    an inspiratory tube connected to said ventilator/anaesthetic unit and adapted for communication with a patient for carrying a breathing gas from said ventilator/anaesthetic unit to a patient;

    an expiratory tube connected to said ventilator/anaesthetic system and adapted for communication with a patient for carrying expired breathing gas from a patient to said ventilator/anaesthetic unit;

    a patient tube connected to said inspiratory tube and to said expiratory tube and adapted for connection to airways of a patient;

    a flow meter disposed downstream of said patient tube for measuring a flow of expired breathing gas and for generating a flow signal corresponding to said flow of expired breathing gas;

    carbon dioxide meter means, juxtaposed to said flow meter downstream from said patient tube, for measuring carbon dioxide in expired breathing gas and for generating a measurement signal and a reference signal identifying carbon dioxide in expired breathing gas at respectively different times; and

    calculating means, supplied with said measurement signal, said reference signal and said flow signal, for calculating a concentration of carbon dioxide in expired breathing gas from a ratio of said measurement signal and said reference signal and for calculating a parameter related to production of carbon dioxide by a patient from said concentration and said flow signal over at least two respiratory cycles of a patient.

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