Surgery – Respiratory method or device – Means for supplying respiratory gas under positive pressure
Patent
1994-09-20
1996-03-26
Burr, Edgar S.
Surgery
Respiratory method or device
Means for supplying respiratory gas under positive pressure
12820426, A62B 902
Patent
active
055012132
ABSTRACT:
A positive pressure demand valve for breathing apparatus incorporates a tubular "balanced piston" valve member for regulating the flow of breathing gas from an inlet to an outlet. A coaxial tension spring acts to bias the valve member open and a lever coupled to a pressure-responsive diaphragm acts to push the valve member closed when a predetermined pressure is attained within the outlet. A combined pressure-relief and bypass valve member enables the operation of the main valve member to be bypassed by porting gas through the center of the main valve seat. A "first breath" mechanism is provided comprising a hooked link which can be pressed in by a button to maintain the main valve member closed and can be released by contact by the diaphragm when a negative pressure is applied to the outlet. The outlet is in the form of a bayonet connector which is locked into a corresponding inlet fitting on the user's mask by means of the same button.
REFERENCES:
patent: 3647175 (1972-03-01), Bonneau et al.
patent: 4224938 (1980-09-01), Hilal
patent: 4345592 (1982-08-01), Giorgini et al.
patent: 4345593 (1982-08-01), Sullivan
patent: 4361145 (1982-11-01), Ekstrom et al.
patent: 4572176 (1986-02-01), Walther
patent: 4693242 (1987-09-01), Biard
patent: 4715371 (1987-12-01), Haas
patent: 5190030 (1993-03-01), Semeia
Burr Edgar S.
Hernandez Pedro P.
Mack Anna E.
Racal Health & Safety Limited
Raciti Eric P.
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