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Demand oxygen system

  • US 5,137,017 A
  • Filed: 03/14/1991
  • Issued: 08/11/1992
  • Est. Priority Date: 04/13/1989
  • Status: Expired due to Term
First Claim
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1. A method of conserving oxygen supplied to a patient via a nasal catheter, comprising steps ofproviding the catheter with two nares, one for each nostril of the patient,physically isolating the two nares from each other so that there is no fluid communication between them,feeding oxygen from a source of oxygen through only a first tube connected to only one nare of the catheter,exhausting exhaled gases from said patient through only a second tube connected only to the other nare of the catheter,sensing the onset of exhalation with a transducer connected only to said second tube,suspending flow of oxygen through said first tube by closing a valve therein responsive to said transducer when the onset of exhalation is detected, andreestablishing oxygen flow through said first tube by opening said valve when the onset of inhalation is sensed by the transducer.

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