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RESISTANCE MATCHING IN A PATIENT CIRCUIT

  • US 20110226246A1
  • Filed: 11/21/2009
  • Published: 09/22/2011
  • Est. Priority Date: 12/11/2008
  • Status: Active Grant
First Claim
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1. A circuit that defines a gas flow path between a pressure generator and an airway of a subject to enable the provision of gas from the pressure generator to the airway of the subject, the circuit comprising:

  • an interface appliance configured to provide gas to and receive gas from an airway of a subject, the interface appliance forming a flow path between a conduit interface opening and one or more subject interface openings, wherein the one or more subject interface openings communicate gas between the airway of the subject and the interior of the interface appliance, and wherein the flow path formed by the interface appliance between the conduit interface opening and the one or more subject interface openings has a first resistance to gas flow;

    a conduit that forms a flow path between a first opening and a second opening, wherein the first opening receives gas from a pressure generator, wherein gas within the flow path formed by the conduit is communicated to the conduit interface opening of the interface appliance via the second opening, and wherein the flow path formed by the conduit between the first opening and the second opening has a second resistance to gas flow; and

    a flow limiting feature disposed within the circuit, the flow limiting feature providing a supplemental resistance to gas flow within the circuit, and wherein the overall resistance to gas flow within the circuit is a function, at least in part, of an aggregation of the first resistance, the second resistance, and the supplemental resistance, and wherein the flow limiting feature is configured such that the supplemental resistance increases the overall resistance to gas flow within the circuit to a predetermined resistance.

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