Abstract A portable power-driven respirator controls measured amounts of air (and, if desired, admix gases, such as oxygen) to a patient during inhalation events and from the patient during exhalation events. The events are controlled pneumatically and electrically as to time and rate of occurrence, duration and relationship. Quantities, pressures and times are precisely regulated and monitored automatically with some patient override, provision for deep breaths, some manual control and with indicators and alarms. The alarms include plural inspiratory pressure alarms, some momentary without necessary continuation, and with provision to terminate inhalation under certain conditions and to put the patient effort on an adjustable pressure level with an optional decreasing inspiratory flow pattern available and with auxiliary equipment separately supplied with air so as not to interfere with the operation of the respirator itself.
A respirator comprising a displacement chamber having a wall movable toward and away from a predetermined location, means for urging said wall toward said location, means for supplying said chamber with gas at a pressure to urge said wall away from said location, means for detecting the position of said wall relative to said location, means for controlling said supplying means, means responsive to said detecting means for actuating said controlling means, a patient airway, means for connecting said chamber to said patient airway, a valve in said connecting means, means for operating said valve in accordance with pressure in said patient airway, and means additional to said operating means for urging said valve toward closed position.
Claim 2
Dependent Claim
117 words
A respirator comprising a displacement chamber having a wall movable toward and away from a predetermined location, means for urging said wall toward said location, means for supplying said chamber with gas at a pressure to urge said wall away from said location, means for detecting the position of said wall relative to said location, means for controlling said supplying means, means responsive to said detecting means for actuating said controlling means, a patient airway, means for connecting said chamber to said patient airway, a valve in said connecting means, means for operating said valve in accordance with pressure in said patient airway, and means additional to said operating means for urging said valve toward closed position.
Claim 3
Dependent Claim
22 words
A respirator as in claim 1 in which said additional means operates in time with the breathing pressure cycle in said airway.
Claim 4
Dependent Claim
20 words
A respirator as in claim 2 in which said additional means operates only during the inspiration portion of said cycle.