Respiratory apparatus for free underwater diver

Details Respiratory apparatus for free underwater diver Respiratory apparatus for free underwater diver

1976-01-07

1977-11-01

Truluck, Dalton L.

Surgery

Truss

Pad

128142G, A62B 700

Patent

active

040560988

ABSTRACT:
Respiratory apparatus for a free underwater diver comprising a sealed and deformable respiratory bag in pressure equilibrium with the exterior and into which the diver inspires and expirates. The bag communicates on the one hand with an absorbant means for CO.sub.2 and on the other hand, with bottles of oxygen and a compressed neutral gas, the communication with the bottle of neutral gas being effected through a valve secured to a plate on which the wall of the bag acts when the volume thereof is reduced. At least one sensor of the partial pressure of oxygen is disposed in the bag and delivers a voltage signal proportional to the pressure, and an electrovalve is placed in a circuit connecting the oxygen bottle to the bag. An electronic regulation circuit is connected to the sensor and to the electrovalve for automatically controlling the electrovalve to maintain the partial pressure of oxygen in the respiratory bag substantially equal to an adjustable assigned value, the electrovalve and the electronic circuit being placed in a sealed casing which communicates with the interior of the respiratory bag.

REFERENCES:
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patent: 3871170 (1975-03-01), Bergey
patent: 3893459 (1975-07-01), Mausteller et al.
patent: 3957043 (1976-05-01), Shelby

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