Backpressure-modulating cartridge for breathing mask

Details Backpressure-modulating cartridge for breathing mask Backpressure-modulating cartridge for breathing mask

1997-05-09

1999-08-17

Weiss, John G.

Surgery

Respiratory method or device

Face mask covering a breathing passage

12820716, 12820615, 12820524, 12820511, A62B 1810

Patent

active

059378573

ABSTRACT:
A backpressure-modulating cartridge for a breathing mask includes a body defining a first chamber which communicates with the environment, a second chamber which communicates with the mask, and a passage which communicates with the first and second chambers. A guide rod is supported by the body and is disposed in the passage. A movable exhalation valve is supported by the guide rod in the first chamber and has at least one transfer hole opposite the passage. A mechanism is provided for urging the movable exhalation valve into a passage-closing position. A movable inhalation valve is provided which has a surface area that is smaller than a cross-section of the passage. A mechanism is provided for opposing the mechanism for urging such that the movable inhalation valve is urged to close the at least one transfer hole of the movable exhalation valve.

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patent: 5813401 (1998-09-01), Radcliff et al.
patent: 5845637 (1998-12-01), Knott

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