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US 5,137,017 AGranted
Demand oxygen system
AssigneeSalter Labs
InventorPeter Salter
Life of this patent
Estimating the term…
Abstract
An intermittent oxygen delivery system for supplying oxygen to a first nare of a nasal cannula in response to patient's exhalation sensed through the second nare which is isolated from the delivery of the oxygen to the first nare.
Claims2
A method of conserving oxygen supplied to a patient via a nasal catheter, comprising steps of
- providing 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, and
- reestablishing oxygen flow through said first tube by opening said valve when the onset of inhalation is sensed by the transducer.
4 more elements
A method of conserving oxygen supplied to a patient via a nasal catheter, comprising steps of
- providing 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, and
- reestablishing oxygen flow through said first tube by opening said valve when exhalation is no longer sensed by the transducer.
4 more elements
Dependencies are inferred from the claim text.