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Gas mixing apparatus for a ventilator

  • US 6,467,478 B1
  • Filed: 02/02/2000
  • Issued: 10/22/2002
  • Est. Priority Date: 02/08/1995
  • Status: Expired due to Term
First Claim
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1. A method for mixing gas for a ventilator system for supplying mixed gas to a patient airway during an inspiratory portion of a breath cycle, said ventilator system including a pump chamber, a gas displacement member disposed within said pump chamber, the gas displacement member being moveable between first and second positions, the method comprising the steps of:

  • mixing a first selected gas with a second selected gas to provide mixed gas for the pump chamber;

    moving the gas displacement member between said first position and said second position to deliver a flow of mixed gas from the pump chamber to the patient airway, and to draw mixed gas into the pump chamber.

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