×

Intermittent mandatory assisted ventilation system for positive pressure breathing apparatus

  • US 3,976,064 A
  • Filed: 03/11/1975
  • Issued: 08/24/1976
  • Est. Priority Date: 03/11/1975
  • Status: Expired due to Term
First Claim
Patent Images

1. In a respiration system having a breathing tube with an open output end for delivering oxygen-containing gas to a patient and an input end;

  • means connected to the input end of the breathing tube for supplying oxygen-containing gas to the breathing tube at a first pressure near or at atmospheric pressure for unassisted breathing by the patient;

    means for providing oxygen-containing gas to the breathing tube at a second pressure higher than the first pressure for providing a ventilation assist to the patient, said second higher pressure gas providing means including a ventilation valve coupled to said input end of said breathing tube for controlling the flow of oxygen-containing gas at said second pressure to said breathing tube;

    sensitivity control means coupled to said breathing tube for determining the pressure therein, said sensitivity control means including means for actuating said ventilation valve responsive to the presence of a third pressure in said breathing tube, said third pressure being below said first pressure, said sensitivity control means providing a ventilation assist to the patient responsive to an inspiration by the patient;

    the improvement which comprises;

    timing means for measuring a given time interval sufficient to allow the patient to inhale and exhale at least one unassisted breath, means for desensitizing said sensitivity control means so as to render the same inoperative; and

    means coupling said timing means to said desensitizing means for desensitizing said sensitivity control means during each given time interval of said timer such that the ventilation valve is inoperative during the time interval to allow the patient to inhale and exhale at least one unassisted breath from said oxygen-containing gas at said first pressure, and for releasing said desensitizing means upon expiration of said time interval such that said sensitivity control means is rendered operative subsequent to each of said time intervals, thereby providing subsequent assisted ventilation for the patient from said oxygen-containing gas at said second pressure;

    said breathing tube being open to said first pressure oxygen-containing gas during said time interval;

    whereby said respirator system provides a single intermittent mandatory assisted ventilation upon inspiration by the patient after expiration of the time interval during which the patient breaths unassisted from the first pressure oxygen-containing gas.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×