Surgery – Respiratory method or device – Means for supplying respiratory gas under positive pressure
Patent
1997-08-19
1999-03-16
Weiss, John G.
Surgery
Respiratory method or device
Means for supplying respiratory gas under positive pressure
12820429, 12820524, A62B 902
Patent
active
058817255
ABSTRACT:
A pneumatic oxygen conserver used with a single-tube cannula. The conserver includes a body having first and second cavities. A main diaphragm divides the first cavity into first and second chambers. An inlet passage delivers oxygen from a supply to the first chamber, and an outlet passage delivers oxygen from the first chamber to the cannula. The main diaphragm is movable between a closed position preventing oxygen flow through the outlet passage and an open position permitting flow. A first flow control passage connects the inlet passage and the second chamber, and a first flow control orifice in the passage restricts flow. A sensing diaphragm divides the second cavity into third and fourth chambers. A second flow control passage connects the second and third chambers, and a second flow control orifice in the passage restricts flow. The sensing diaphragm is movable between a closed position preventing flow through the second passage and an open position permitting such flow. A vent passage vents the third chamber. A sensing passage connects the outlet passage and the fourth chamber. Inhalation into the cannula moves the sensing diaphragm to its open position to vent the second and third chambers causing the main diaphragm to move to its open position for delivering oxygen to the cannula.
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Hoffman Richard E.
Miller Richard W.
Nelson Thomas W.
Ostrom Michael V.
Anderson Charles W.
Victor Equipment Company
Weiss John G.
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