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Inspiratory airway pressure system using constant pressure and measuring flow signals to determine airway patency

  • US 5,549,106 A
  • Filed: 07/21/1993
  • Issued: 08/27/1996
  • Est. Priority Date: 05/19/1989
  • Status: Expired due to Term
First Claim
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1. An apparatus for determining the airway patency of a patient exhibiting a breath cycle having inhalation and exhalation phases, said apparatus comprising:

  • means for supplying a breathable gas from a source thereof under a controllable pressure to at least a portion of the patient'"'"'s airway, said pressure being maintained substantially constant during the inhalation phase of a breath cycle;

    means for sensing patient respiration flow and for producing flow signals representative of patient respiration flow;

    signal processing means for receiving said flow signals and for determining patient airway patency values from said flow signals in view of said pressure of breathable gas delivered by said means for supplying; and

    means for adjusting said pressure in accordance with said patient airway patency values.

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