Differential pressure valve employing near-balanced pressure
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United States of America Patent
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Issued Date -
Oct 7, 2004
app pub date -
Sep 19, 2003
filing date -
Sep 19, 2002
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A differential pressure valve is used to deliver a medical gas such as oxygen to a patient. A movable slave diaphragm operates to open and close a gas passageway in response to the patient's inhalations. In particular, the slave diaphragm opens and closes a nozzle that is pressurized by stored oxygen in a gas reservoir. The diaphragm is pneumatically controlled in response to the patient's inhalation. The nozzle is sized so that the forces exerted on the diaphragm on the nozzle side of the diaphragm nearly balance the forces exerted on the opposing (timing gas chamber) side of the diaphragm. Furthermore, the nozzle includes a filter element.
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