Fail-safe respiratory gas delivery systems

Details Fail-safe respiratory gas delivery systems Fail-safe respiratory gas delivery systems

A - Human Necessities

61

M

A61M 16/00 (2006.01) A61M 16/10 (2006.01) A62B 7/00 (2006.01) A61M 16/06 (2006.01)

Patent

CA 2114217

A fail-safe device (12) for use with pulse dose respirating gas delivery systems (11) provides a continuous, metered flow of oxygen (13) to a patient in the event that the delivery system (11) malfunctions or suffers a power failure. The device (12) includes a piston (22) resiliently biased toward one end of a cylinder (21) and having provision for applying the force of pressurized respi- rating gas to the piston (22) in opposition to the biasing force (24) and in synchronization with the cycling of the pulse dose deliv- ery system (11) and to remove that force in coordination with the cycling of the system (11). The piston movement (22) is arranged to actuate valve means (38, 38a) opening a path (19) 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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