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Process and device for supplying respiratory oxygen

  • US 4,827,922 A
  • Filed: 03/02/1988
  • Issued: 05/09/1989
  • Est. Priority Date: 03/05/1987
  • Status: Expired due to Fees
First Claim
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1. A method for supplying a patient having inspiratory and expiratory phases with respiratory oxygen, comprising the following steps:

  • (a) providing an oxygen supply during only a part of an inspiratory phase;

    (b) initiating said inspiratory phase by detecting a reduction in pressure in a detecting chamber;

    (c) modifying current from a sensor means in response to an increase in optical flux due to a reduction in the distance between said sensor means and a reflector means which is due to an expansion of a windbag resulting from a pressure drop in said detecting chamber to insure a supply of respiratory gas;

    (d) storing, in a memory, during each inspiratory-expiratory phase, a reference output voltage of said sensor means representing the atmospheric pressure; and

    (e) causing the delivery of breathable gas to the patient at the start of the patient'"'"'s inspiratory phase detected by comparison of said reference voltage with a voltage representing an inspiratory depression.

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