Automated gas delivery system for blood gas exchange devices

Details Automated gas delivery system for blood gas exchange devices Automated gas delivery system for blood gas exchange devices

A - Human Necessities

61

M

A61M 1/16 (2006.01)

Patent

CA 2086127

2086127 9200777 PCTABS00010 A system for delivering oxygen to a gas permeable membrane oxygenator is disclosed. The system may include an integral source of gas (10) under pressure and a source of vacuum (12). A first mass flow controller (106) is connected to the source of gas (10) upsteam in the gas flow from the gas exchange device (14). A pressure valve (112) is positioned in the gas flow between the first mass flow controller (106) and the gas exchange device (14). An atmospheric vent (110) is positioned between the pressure valve (112) and the first mass flow controller (106). A second mass flow controller (128) is positioned downstream from the gas exchange device (14) and is connected to the source of vacuum (12). A central controller (130) commands the pressure valve (112) to maintain the pressure at the inlet of the gas exchange device (14) at a subatmospheric pressure. The second mass flow controller (128) is commanded to maintain a rate of flow which is desired through the gas exchange device (14). The first mass flow controller (106) is commanded to maintain a rate of flow higher than the second mass flow controller (128) to ensure that a sufficient flow of gas is available through the pressure valve (112) and the gas exchange device (14). The excess gas is exhausted through the vent (110). The present invention ensures sufficient gas flow at the gas exchange device (14) to provide transfer of gases with the blood. Also, the pressure of the gas within the gas exchange device (14) is low enough that outgassing through bubbles into the blood is avoided.

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