Surgery – Respiratory method or device – Means for supplying respiratory gas under positive pressure
Patent
1989-02-03
1991-08-13
Lewis, Aaron J.
Surgery
Respiratory method or device
Means for supplying respiratory gas under positive pressure
12820421, 12820423, 12820524, 12820426, A61M 1600
Patent
active
050387707
ABSTRACT:
A fail-safe system for use with pulse dose respirating gas delivery devices provides a continuous, metered flow of oxygen to the patient in the event that the delivery device malfunctions or suffers a power failure. The system includes a piston resiliently biased toward one end of a cylinder and having provision for applying the force of pressurized respirating gas on the piston in opposition to the biasing force and in synchronization with doses of respirating gas produced by the delivery device and to remove that force in coordination with the delivery of a gas dose to the patient. The piston movement is arranged to actuate valve means opening a path for the continuous flow of oxygen to the patient in the event that successive gas doses are not delivered to the patient within a predetermined length of time.
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Lewis Aaron J.
Shubert Roland H.
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