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Oxygen mixing in a blower-based ventilator

  • US 5,701,883 A
  • Filed: 09/03/1996
  • Issued: 12/30/1997
  • Est. Priority Date: 09/03/1996
  • Status: Expired due to Term
First Claim
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1. Apparatus for delivering pressurized gas to the airway of a patient, said apparatus comprising:

  • gas flow generator means for providing a flow of said gas;

    conduit means for delivery of said gas flow to the airway of the patient;

    said conduit means comprising at least one primary conduit portion for carrying a primary flow of said gas towards the airway of said patient;

    means for providing supplemental oxygen to the patient concomitantly with the provision of the primary flow of said gas to the patient;

    said means for providing supplemental oxygen comprising;

    means for introducing a flow of supplemental oxygen into said at least one primary conduit portion of said apparatus;

    means for metering the flow of supplemental oxygen into said at least one primary conduit portion of said apparatus;

    said metering means comprising means for regulating the flow of supplemental oxygen into said at least one primary conduit portion of said apparatus as a function of at least one of;

    the magnitude of said primary flow in said at least one main conduit portion; and

    the direction of said primary flow in said at least one main conduit portion.

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