Surgery – Respiratory method or device – Means for mixing treating agent with respiratory gas
Patent
1996-07-31
1997-09-09
Millin, V.
Surgery
Respiratory method or device
Means for mixing treating agent with respiratory gas
12820921, 12820518, 417259, A61M 1600
Patent
active
056645600
ABSTRACT:
The gas mixing apparatus provides the components of a breathing gas for mixing at approximately ambient atmospheric pressure, and regulates the pressure of a selected gas to approximately ambient atmospheric pressure for mixing with air at ambient atmospheric pressure. The gas mixing apparatus includes a piston disposed within a pump chamber. A flow limiting inlet controls introduction of a first selected gas such as oxygen for mixing with a second selected gas such as air. The pressure of the first selected gas is limited to an acceptable maximum pressure, so that even if a valve for admitting the first selected gas for mixing at ambient pressure fails, breathing gas will not be provided at an excessive pressure. A demand valve is alternatively provided for reducing the pressure of the first selected gas supplied before mixing, but a pressure sensor is also provided downstream of the demand valve for detecting failure of the demand valve, to shut off the supply of the first selected gas to prevent overpressurization.
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Younes, et al., "Proportional Assist Ventilation"; Am Rev Resp Dis 1992; 145: 121-129.
Gee Glen N.
Merrick Edwin B.
O'Dea John
O'Mahony John
Millin V.
Puritan-Bennett Corporation
Raciti Eric P.
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