Medical ventilators
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United States of America Patent
Stats
-
May 3, 1994
Grant Date -
N/A
app pub date -
Jan 24, 1992
filing date -
Jun 7, 1989
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A medical ventilator comprises a ventilator duct having an inlet for respiratory fresh gas. The pressure at which the respiratory fresh gas is supplied to the patient is determined by a driving jet disposed in the ventilator duct at a distance from the inlet so that an intervening column of gas acts as a pneumatic piston. The supply of driving gas to the jet is initially set by a regulator to obtain a desired value of a respiratory parameter, such as the volume of gas ventilating the patient's lungs during the breathing cycle. The volume of gas expelled from the patient's lungs is monitored during operation by detecting means and the regulator is adjusted by a servomotor in response to any change in the measured parameter in order to maintain the parameter at the desired value.
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