A7™ Service Manual 046-006272-00 1 - 33
Theory of Operation Gas Flow
FIGURE 1-34
1.3.4.14 Breathing System
The breathing system provides a closed loop for the anesthetic gas. The expired gas from the patient
can be inspired in the inspiration phase to maintain the temperature and humidity conditions of the
patient's expired gas. During inspiration, the drive gas depresses the bag inside the bellows to force
the inside gas to enter the patient's lung. During expiration, the patient's expired gas goes into the
bag inside the bellows. The sodalime absorber canister (integrating 43 and 44) absorbs CO2 that the
patient expires. The following figure shows the pneumatic circuit of the breathing system.
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