Surgery – Respiratory method or device – Means for supplying respiratory gas under positive pressure
Patent
1993-02-01
1994-11-01
Cohen, Lee S.
Surgery
Respiratory method or device
Means for supplying respiratory gas under positive pressure
12820524, A61M 1600
Patent
active
053600002
ABSTRACT:
A compact, simplified, totally pneumatic demand valve designed for coupling between a source of pressurized gas and a recipient user is provided which achieves a high degree of sensitivity and flow control without expensive, bulky valving arrangements characteristic of prior demand valves. Preferably, the demand valve includes a valve body presenting a gas flow passageway, together with pneumatically coupled sensing and slave diaphragms; the slave diaphragm is interposed in the flow passageway and prevents gas flow during the exhalation phases of the patient's breathing cycle. During inhalation sensed by the sensing diaphragm, the slave diaphragm is shifted to open the gas flow passageway in the valve, thus permitting passage of gas to the patient. The valve is designed for coupling to a fixed orifice flow controller, which may be positioned either downstream or upstream of the valve as desired.
REFERENCES:
patent: 2318827 (1943-05-01), Yant
patent: 2552595 (1951-05-01), Seezer
patent: 3285261 (1966-11-01), Chaney
patent: 3434471 (1969-03-01), Liston
patent: 4054133 (1977-10-01), Myers
patent: 4575042 (1986-03-01), Grimland et al.
Auerbach, David; "A New Oxygen Cannula System Using Intermittent-Demand Nasal Flow" Jul. 1, 1978.
Cohen Lee S.
Lacyk John P.
Puritan-Bennett Corporation
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