Surgery – Respiratory method or device – Means for supplying respiratory gas under positive pressure
Patent
1994-02-01
1995-11-07
Burr, Edgar S.
Surgery
Respiratory method or device
Means for supplying respiratory gas under positive pressure
12820426, A62B 902
Patent
active
054640091
ABSTRACT:
A demand valve for use in breathing apparatus, and comprising a housing 1 in which is mounted a diaphragm 2 such as to divide the interior of the housing into two separate chambers 3,4. Chamber 4 is vented to atmosphere through a hole 14; chamber 3 is connected via a pipe 13 to a gas outlet whereby breathing gas may be supplied to a face piece or mask for a user. Breathing air is supplied from a main gas supply channel 8 via a main valve 9,10 to a gas supply channel 6. A gas inlet channel 5 connects the supply channel 6 to the chamber 3 under the control of a needle valve 11 which closes an orifice 7. The head 11B of the needle valve is urged by a spring (not shown) into contact with the diaphragm 2 and thus the movement of the diaphragm controls the opening and closing of the needle valve. The diaphragm 2 is pivoted about spaced pivot members 15, and leaf springs 16 are used to maintain the diaphragm in contact with the pivot members 15. A leaf spring 17 acts to push the diaphragm about the pivot members in a direction such as to tend to close the needle valve 11.
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Burr Edgar S.
Lewis Aaron J.
Sabre Safety Limited
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