System and method for closed loop airway pressure control during the inspiratory cycle of a breath in a patient ventilator using the exhalation valve as a microcomputer-controlled relief valve
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United States of America Patent
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Sep 29, 1998
Issued Date -
N/A
app pub date -
Jan 10, 1997
filing date -
Mar 16, 1993
priority date (Note) -
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Abstract
The method and system for controlling airway pressure in a ventilator during the inspiratory cycle involves controlling the flow of breathing gas through a flow supply valve venting the breathing gas at a desired rate of outflow through a relief valve to achieve the desired airway pressure. Measurements of the rates of actual supply flow, the actual outflow through the exhalation/relief valve, and the pressure in the airway are compared with desired values for determination the amount of error for feedback control of the ventilator system.
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