Gas flow control method in a blower based ventilation system

Details Gas flow control method in a blower based ventilation system Gas flow control method in a blower based ventilation system

2004-09-24

2009-02-10

Douglas, Steven O (Department: 3771)

Surgery

Respiratory method or device

Means for supplying respiratory gas under positive pressure

C128S204230

Reexamination Certificate

active

07487773

ABSTRACT:
The invention is directed to a system and method for controlling the flow of gas from a medical ventilator into a patient's lungs. The control system provides for a non-linear feedforward controller to correct for disturbances caused by back pressure at the outlet of the blower of the medical ventilator. For this purpose, a pressure transducer is provided to measure the back pressure. Additionally, the invention allows for a feedback controller to correct for the differences between the rate of the actual gas flow and the targeted gas flow rate. For this purpose a flow rate transducer is provided. The control system may account for each of the gas flow rate error and the back pressure disturbance to provide for a quick and accurate adjustment to achieve the targeted gas flow rate.

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PCT International Search Report & Written Opinion for Application PCT/US2005/033816, 16 pages, Mailed Dec. 22, 2005.

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