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Bymixer apparatus and method for fast-response, adjustable measurement of mixed gas fractions in ventilation circuits

  • US 7,793,659 B2
  • Filed: 10/14/2003
  • Issued: 09/14/2010
  • Est. Priority Date: 10/11/2002
  • Status: Active Grant
First Claim
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1. A bymixer device comprising:

  • an inflow port connectable to a conduit such that all respiratory gas flowing through that conduit will enter the inflow port;

    a flow divider which divides the flow of respiratory gas that enters the inflow port into first and second streams;

    a main flow channel through which the first stream flows;

    a bypass flow channel through which the second stream flows;

    said bypass flow channel comprising a) a flow restrictor that restricts the flow of gas through the bypass flow channel, b) a mixing chamber positioned upstream of the flow restrictor, said mixing chamber comprising tubing that is alternately extendable and contractible so as to enable a user to alternately increase and decrease the volume of the mixing chamber; and

    c) sampling apparatus for sampling respiratory gas from said mixing chamber;

    a flow combiner that combines the first and second streams after they have passed through the main flow channel and bypass flow channel to form a combined outflow stream; and

    an outflow port that is connectable to a conduit such that the combined outflow stream enters that conduit.

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