PNEUMATIC OXYGEN CONSERVER

摘要

The present invention is a pneumatic oxygen conserver (22) used with a single tube cannula (32). The conserver includes a body (40) having first and second cavities. A main diaphragm divides the first cavity into first and second chambers. An inlet passage (42) delivers oxygen from a supply to the first chamber, and an outlet passage (410) delivers oxygen from the first chamber to the cannula (32). 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. A first flow control orifice in the passage restricts flow. A sensing diaphragm (80) divides the second cavity into third and fourth chambers.