Personal disposable emergency breathing system

Details Personal disposable emergency breathing system Personal disposable emergency breathing system

A - Human Necessities

62

B

A62B 17/04 (2006.01) A62B 19/02 (2006.01)

Patent

CA 2084765

The breathing system comprises a canister (12) carrying layered filter- ing material, including activated carbon granules, a desiccant, a catalyst for the catalyzation of carbon monoxide to carbon dioxide, and electrostatically charged filters between the layers of filtering material. A mouthpiece (28) carrying a noseclip (33) and inhalation and exhalation check-valves and a whistle is disposed within a flexible, substantially completely transparent hear-through hood (34), both the mouthpiece (28) and hood (34) being dis- posed in the canister (12) between the filtering material and a cover for the canister. In use, the cover is removed, air inlet apertures are uncovered, and the hood (34) is drawn about an individual's head and substantially sealed about the neck. With the mouthpiece (28) in the individual's mouth, and no- seclip (33) closing off the user's nose, inhalation causes air to flow through the filtering material and the inhalation check valve and past the exhalation check valves. When exhaling, the exhalation check valves open to permit ex- haled air to flow into the hood. The inhalation valve closes during exhala- tion to prevent backflow of air through the filtering material. By exhaling in- to the hood (34), a slight positive pressure within the hood is established to prevent noxious gases, smoke particles and the like from entering the hood (34) through the neck opening (44).

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