Process for changing the concentration in an anesthesia apparatus
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United States of America Patent
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Apr 29, 2003
Grant Date -
Feb 28, 2002
app pub date -
May 29, 2001
filing date -
Aug 22, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process, system and apparatus for changing the concentration in an anesthesia apparatus with a fresh gas metering unit (14) and a pressure sensor (17) in the breathing circuit, with a volume displacement device (1) in the inspiration branch and a PEEP/P.sub.MAX valve (7) in the expiration branch. The fresh gas metering unit (14), the pressure sensor (17), the volume displacement unit (1) and the PEEP/P.sub.MAX valve (7) are connected to an evaluating and control unit (15). To bring about a rapid change in the concentration of the anesthetic or fresh gas supplied in the breathing circuit without additional design effort on the anesthesia apparatus the volume displacement device (1) is rinsed, either under the control of the fresh gas supply or under the control of the speed at which the volume displacement device (1) is returned. The rinsing takes place simultaneously with the regular respiration operation of the anesthesia apparatus, which may take place in a volume-controlled or pressure-controlled manner.
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