Balanced exhalation valve for use in a closed loop breathing sys

Details Balanced exhalation valve for use in a closed loop breathing sys Balanced exhalation valve for use in a closed loop breathing sys

1988-05-06

1989-11-14

Hindenburg, Max

Surgery

Respiratory method or device

Means for supplying respiratory gas under positive pressure

251282, 137494, A62B 902

Patent

active

048799980

ABSTRACT:
A closed loop breathing system includes a face mask, a pressurized bottle of oxygen-rich breathing gas, and an exhalation hose and an inhalation hose both coupled to the face mask. Flexible breathing bags smoothen the flow of expired gas through the system, and a container of sorbent material removes CO.sub.2 from the expired gas. A mixing valve mixes expired breathing gas from the face mask with oxygen-rich breathing gas from the pressurized container. A balanced exhalation valve assembly coupled to the exhalation hose includes a main valve which passes the flow of expired gas from the exhalation hose into a chamber and prevents the reverse flow of gas from the chamber into the exhalation hose. A flexible diaphragm forms one wall of the chamber and is coupled to the main valve by a rigid spacer to prevent a pressure increase in the chamber from increasing the force necessary to open the main valve.

REFERENCES:
patent: 2573522 (1951-10-01), Watt
patent: 2720891 (1955-10-01), Glasgow
patent: 3180360 (1965-04-01), Pavlin

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