Gas mixing apparatus for a ventilator

Surgery – Respiratory method or device – Means for mixing treating agent with respiratory gas

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12820518, A61M 1600, A62B 700

Patent

active

06116240&

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, pp. 121-129.

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