Progressive pressure indicator

Details Progressive pressure indicator Progressive pressure indicator

1998-06-25

2000-08-01

Lewis, Aaron J.

Surgery

Respiratory method or device

Means for supplying respiratory gas under positive pressure

12820222, A62B 700

Patent

active

060951427

ABSTRACT:
A pressure indicating device for self contained breathing apparatus includes a piston arrangement which is responsive to the relative pressures of the supply and the pressure at the outlet of the first stage regulator to assume several different positions in the containment housing. Piston position is recognized by electronic circuitry and an LED display is lighted accordingly to provide a series of unique signals to the user, of the remaining quantity of breathing fluid. In one embodiment of the invention, plural, graduated-size pistons provide a progressive indication of the air supply. In another embodiment, a single, stepped piston effects progressive electrical contact at various positions in the travel of the piston.

REFERENCES:
patent: 3914736 (1975-10-01), Nakamura et al.
patent: 4800373 (1989-01-01), Mayz
patent: 5097826 (1992-03-01), Gray et al.
patent: 5191317 (1993-03-01), Toth et al.
patent: 5351188 (1994-09-01), Sato
patent: 5357242 (1994-10-01), Morgano et al.
patent: 5457284 (1995-10-01), Ferguson
patent: 5506571 (1996-04-01), Dugan

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