Respiratory protective device

Details Respiratory protective device Respiratory protective device

1989-09-15

1992-02-11

Green, Randall L.

Surgery

Respiratory method or device

Means for supplying respiratory gas under positive pressure

12820525, 12820615, 12820617, 12820627, 12820629, 12820711, 12820712, 12820529, A62B 902

Patent

active

050867687

ABSTRACT:
The respiratory protective device minimizes dead space by locating the exhalation valve mechanism slightly spaced from, but directly in front of the mouth. The inhalation valve mechanism surrounds the streamlined flow path leading to the exhalation valve mechanism. The inhalation valve mechanism is located in a common chamber which receives filtered air from all filter assemblies. A chin support is provided which relieves any force to the gums and teeth as a result of the mouthpiece. Alternatively, a mechanism for forcing the wearer's lips closed around the mouthpiece to maintain a seal thereto is provided.

REFERENCES:
patent: 2318790 (1943-05-01), Martindale
patent: 3643686 (1972-02-01), Koegel
patent: 3805778 (1974-04-01), Garrahan
patent: 4207882 (1980-06-01), Lemere
patent: 4449526 (1984-05-01), Elam
patent: 4470413 (1984-09-01), Waracka
patent: 4674492 (1987-06-01), Niemeyer

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