Gas ventilating device
OwnerJohn P. Strupatinventor
Life of this patent
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Abstract
The invention discloses a gas ventilating device where the tidal volume during the inhalation phase of any cycle of patient consumption is constant and fixed; hence, the deliverable volume is independent of the head pressure of the supply source of the gas. Further, the tidal volume can be controlled by altering the differential pressure of the gas in a fixed volume tank which acts as an intermediate storage tank for gas. Control means, using fluidic devices including monostable and bistable devices control the charging and discharging of the fixed volume tank with gas so that the fixed volume of gas can be supplied to the patient.
Claims7
An apparatus for filling a fixed hollow enclosure with fluid of given volume and for evacuating the same to deliver a fixed volume of gas in successive cycles including:
- (a) means for delivery of a first phase of fluid to the enclosure until the pressure therein reaches a predetermined high pressure point;
- and,
- (b) means for delivery as a second phase a fixed volume of the fluid in the enclosure to a patient until the pressure in the enclosure reaches a predetermined low pressure point;
- including conveying means for conveying the fluid from the enclosure to the patient.
An apparatus for ventilating a patient with a given volume of fluid comprising:
- (a) a source of fluid under pressure;
- (b) a tank of fixed volume;
- (c) delivery means for delivering a fixed volume of fluid at a predetermined pressure to the patient;
- (d) first passage means extending from the source to said tank in a normally open state;
- (e) second passage means extending from said tank to said delivery means in a normally closed state;
- (f) sense and switch means for sensing a high point and a low point in the pressure in the tank and at each point reversing the states of the first and second passage means whereby, in the first state fluid flows from the source into the tank and in the second state from the tank through the delivery means to the patient.
Dependencies are inferred from the claim text.