Intermittent mandatory assisted ventilation system for positive pressure breathing apparatus
First Claim
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.
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Abstract
A respiration system for weaning patients from a respirator wherein a mandatory ventilation assist is provided to the patient upon inspiration after predetermined time intervals. A sensitivity mechanism for sensing inspiration by the patient and for actuating the mandatory ventilation assist is desensitized or rendered inoperative during a predetermined time interval in which the patient will be required to breathe normally without assist. At the end of the time interval, the sensitivity mechanism is again rendered operative for the mandatory ventilation assist. In the event that the patient does not trigger the sensitivity mechanism within a second given period of time following the end of the time interval, a mandatory ventilation assist is provided.
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Citations
16 Claims
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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;
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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 Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An intermittent mandatory assisted ventilation system for a respiration system having a source of oxygen-containing gas at a first pressure, a patient breathing tube, and a ventilation valve connecting said oxygen-containing gas under a first pressure to said patient breathing tube, a sensitivity control means coupled to the breathing tube for detecting the pressure therein, the sensitivity control means including means for actuating the ventilation valve to open responsive to the presence of an inspiration pressure in the breathing tube;
- and a source of an oxygen-containing gas at a pressure lower than said first pressure and at or near atmospheric pressure for unassisted breathing connected to said patient breathing tube;
said intermittent mandatory assisted ventilation system comprising; timing means for measuring a given time interval sufficient to allow at least one unassisted inhalation and exhalation cycle by the patient;
means for desensitizing said sensitivity control means so as to render the same inoperative, and means coupling the timing means to the desensitizing means for desensitizing the sensitivity control means during each given time interval and for releasing the desensitizing means upon expiration of the time interval to allow the patient to draw at least one breath from the lower pressure oxygen source and thereafter to provide ventilation assistance to the patient;said breathing tube being open to said lower pressure oxygen-containing gas for unassisted breathing during the time interval of the timing means whereby said respiration system provides a single intermittent mandatory assisted ventilation upon inspiration by the patient after expiration of the time interval. - View Dependent Claims (12, 13, 14, 15, 16)
- and a source of an oxygen-containing gas at a pressure lower than said first pressure and at or near atmospheric pressure for unassisted breathing connected to said patient breathing tube;
Specification