Breathing apparatus

Details Breathing apparatus Breathing apparatus

1996-07-29

1998-04-14

Lewis, Aaron J.

Surgery

Respiratory method or device

Means for quickly connecting or disconnecting apparatus...

12820524, A62B 904

Patent

active

057380880

ABSTRACT:
A two-stage breathing apparatus comprises a compressed air supply cylinder (1) provided with a cylinder valve (2) communicating through a high-pressure duct (3) with a manifold (4). A first high-pressure branch (5) of the manifold (4) communicates with a pressure indicator warning unit (6) and a second high pressure branch (7), comprising a high pressure flexible hose, connects the manifold (4) via a non-return valve (8) with a high pressure quick release connector (10). The manifold (4) contains a pressure reducer (11) which feeds a demand valve (12) provided on a breathing mask (14) via a further flexible hose (13).
The non-return valve (8) permits flow in the direction from the high-pressure quick release connector (10) to the supply cylinder (1), but prevents flow in the direction from the supply tank (1) to the high-pressure quick release connector (10). Consequently, the supply tank (1) can be replenished rapidly via the quick release connector (10), but if the connector (10) fails or the high pressure flexible hose bursts, the non-return valve prevents the loss of compressed air to the atmosphere.

REFERENCES:
patent: 3238943 (1966-03-01), Holley
patent: 3486730 (1969-12-01), Potash
patent: 3744526 (1973-07-01), MacNiel
patent: 4328798 (1982-05-01), Isaacson
patent: 4392490 (1983-07-01), Mattingly et al.
patent: 4449524 (1984-05-01), Gray
patent: 4714077 (1987-12-01), Lambert
patent: 4838256 (1989-06-01), Miltz
patent: 4974584 (1990-12-01), Goodnoe
patent: 5213095 (1993-05-01), Dague

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