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Inspiratory airway pressure system controlled by the detection and analysis of patient airway sounds

  • US 5,259,373 A
  • Filed: 04/09/1992
  • Issued: 11/09/1993
  • Est. Priority Date: 05/19/1989
  • Status: Expired due to Term
First Claim
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1. An apparatus for facilitating respiration of a patient, the patient exhibiting detectable sounds associated with respiration and exhibiting a breath cycle having inhalation and exhalation phases, the respiration-associated sounds including a spectrum of frequencies, said apparatus comprising:

  • means for detecting a patient'"'"'s respiration-associated sounds; and

    control means, including means for operably coupling with a gas delivery device having means for controllably pressurizing at least a portion of a patient'"'"'s respiration passages with a breathable gas from a source thereof, and coupled with and responsive to said detecting means, for controlling the gas pressure delivered to at least a portion of a patient'"'"'s respiratory passages in accordance with said detected sounds, said control means including means forresolving said airway sounds into a plurality of spectral bands of audio components making up said sounds;

    producing an analysis of said spectral bands;

    producing in response to said analysis a trend value representative of the breath sounds of at least two breaths;

    storing in memory predetermined matter correlated with pressure actions for presenting the minimum pressure necessary to a patient for preventing the onset of obstructive apnea;

    determining one of said pressure actions from said predetermined matter using said trend value; and

    controlling said gas pressure in accordance with said one of said pressure actions thereby presenting the minimum pressure necessary to a patient for preventing the onset of obstructive apnea.

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