Anesthesia breathing circuit with positive end expiratory pressu

Details Anesthesia breathing circuit with positive end expiratory pressu Anesthesia breathing circuit with positive end expiratory pressu

1974-04-09

1976-01-20

Nilson, Robert G.

Fluid handling

Line condition change responsive valves

Bi-directional flow valves

128188, 128202, 137493, A61M 1700

Patent

active

039331717

ABSTRACT:
A valve is provided for use in an anesthesia breathing circuit and is located between the breathing bag or ventilator and the remaining parts of the circuit. The valve comprises a housing having an inlet connectible to the bag or ventilator and an outlet which is connectible to the remaining circuit. The valve has essentially two parallel flow paths for gas; in one path there is a check valve to allow gas to pass only in a direction away from the bag or ventilator, and in the other path is located a diaphragm valve which is spring biased to a closed position and is opened at a predetermined pressure in that path. The valve allows the retention at all times of a predetermined pressure within the patient circuit and thus the operator can select the lowest pressure which the patient's lungs will reach during ventilation to insure the lungs will always be expanded to more than their normal resting state. The position and operation of the present valve also achieves its desired result without introducing appreciable resistance against the patient's exhalation.

REFERENCES:
patent: 2271497 (1942-01-01), Newell
patent: 2841142 (1958-07-01), Hay
patent: 3556097 (1971-01-01), Wallace

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