초록 ▼

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

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.

대표청구항 ▼

[ What is claimed is:] [1.] A pneumatic oxygen conserver adapted for use with a single-tube cannula, said conserver comprisinga body having first and second cavities therein,a main diaphragm extending across the first cavity and dividing the cavity into first and second chambers on opposite sides of

[ What is claimed is:] [1.] A pneumatic oxygen conserver adapted for use with a single-tube cannula, said conserver comprisinga body having first and second cavities therein,a main diaphragm extending across the first cavity and dividing the cavity into first and second chambers on opposite sides of the diaphragm,an inlet passage in the body for the delivery of oxygen from a supply of oxygen to the first chamber,an outlet passage for the delivery of oxygen from the first chamber to said single-tube cannula,said main diaphragm being movable between a closed position in which flow of oxygen through said outlet passage is prevented and an open position permitting such flow,a first flow control passage in the body connecting said inlet passage and said second chamber,a first flow control orifice in said first flow control passage for restricting flow therethrough,a sensing diaphragm extending across the second cavity and dividing the cavity into third and fourth chambers on opposite sides of the diaphragm,a second flow control passage in the body connecting the second and third chambers,a second flow control orifice in the second flow control passage for restricting flow therethrough,said sensing diaphragm being movable between a closed position in which it prevents flow through said second flow control passage and an open position permitting such flow,a vent passage in the body for venting the third chamber, anda sensing passage in the body connecting the outlet passage and the fourth chamber whereby inhalation by a person into said single-tube cannula causes movement of the sensing diaphragm to its open position to vent the second and third chambers to effect movement of the main diaphragm to its open position for delivery of oxygen to said cannula, and whereby exhalation into said cannula results in movement of the sensing diaphragm to its closed position to allow pressurization of the second chamber to cause the main diaphragm to move to its closed position to interrupt the flow of oxygen to said cannula.