Oxygen supply system controlled by user exhalation
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United States of America Patent
Stats
-
Jun 23, 1981
Grant Date -
N/A
app pub date -
Apr 13, 1979
filing date -
Apr 13, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An oxygen supply system for human inhalation of oxygen at a constant oxygen flow rate is provided including an oxygen cylinder having a pressure regulator to provide a source of pressure regulated oxygen which is passed through a fluid restrictor nozzle having a metering orifice to provide a constant volume oxygen flow to an oxygen inhalation mask through a first oxygen hose connected to the cylinder and a second mask hose connected to the inhalation mask. An oxygen flow shut-off valve is provided in a normally open position to allow oxygen flow normally from the cylinder through the hoses and through an inhalation valve in the mask to the user. A fluid pressure responsive diaphragm is provided in association with the oxygen flow shut-off valve to shut-off oxygen flow to the mask when oxygen pressure buildup in the mask hose exceeds a predetermined amount, such buildup occurring when user exhalation closes the mask inhalation valve.
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