Gas mask and breathing equipment with respiration air recirculat

Details Gas mask and breathing equipment with respiration air recirculat Gas mask and breathing equipment with respiration air recirculat

1993-02-10

1994-06-21

Burr, Edgar S.

Surgery

Respiratory method or device

Means for supplying respiratory gas under positive pressure

12820422, 12820426, 12820517, 12820528, A62B 710

Patent

active

053220587

ABSTRACT:
A gas mask and breathing equipment with a breathing mask with a respiration gas outlet and a respiration gas inlet, to which a breathing bag as well as a filter and a fan are connected. The fan is designed to deliver ambient air through the filter and into the breathing mask. A volume sensor is arranged on the breathing bag and is connected to a fan control to reduce the delivery output of the fan with increasing volume of the breathing bag. So that only the absolutely necessary amount of ambient air will have to be delivered through the filter, an air distributing valve (12), is controlled via a valve control means (17) and an actuator (14) as a function of the signal of a carbon dioxide sensor connected to the respiration gas inlet (2). The exhaled air is directed from the respiration gas outlet (3) predominantly into the environment when the carbon dioxide content is above a predeterminable limit value, and predominantly into the breathing bag (7) when the carbon dioxide content is below the limit value.

REFERENCES:
patent: 3575167 (1971-04-01), Michielsen
patent: 3695261 (1972-10-01), Emmons
patent: 4188946 (1980-02-01), Watson
patent: 4423723 (1984-01-01), Winkler
patent: 4430995 (1984-02-01), Hilton
patent: 4440164 (1984-04-01), Werjefect
patent: 4974585 (1990-12-01), Stone
patent: 5119810 (1992-06-01), Kiske et al.
patent: 5237990 (1993-08-01), Psaros et al.

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