Surgery – Respiratory method or device – Means for supplying respiratory gas under positive pressure
Patent
1987-11-03
1990-11-20
Hindenburg, Max
Surgery
Respiratory method or device
Means for supplying respiratory gas under positive pressure
12820426, 12820524, A61M 1600
Patent
active
049710508
ABSTRACT:
Open circuit emergency breathing apparatus is disclosed which includes a pressure demand valve selectively connectable to primary and secondary sources of breathing gas under pressure to direct breathing gas to a breathing hose attached to the valve and then to a face mask worn by a user of the apparatus. The pressure demand valve includes a diaphragm actuated flow control member and a tubular breathing gas sensor operable in response to inhaling and exhaling by the user to control displacements of the diaphragm and corresponding displacements of the flow control member in a manner which enables obtaining and maintaining the flow of appropriate volumes of breathing gas to the user of a wide range of low to high breathing rates and a wide range of breathing gas supply pressures.
REFERENCES:
patent: 2117952 (1958-05-01), Gordou
patent: 2951494 (1960-09-01), Holmes
patent: 3097638 (1963-07-01), Streimer
patent: 3783891 (1974-01-01), Christianson
patent: 4041978 (1977-08-01), Leeman
patent: 4094314 (1978-06-01), Le Cornec
patent: 4186735 (1980-02-01), Henneman
Hindenburg Max
Lacyk John P.
Respirator Research Ltd.
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