Gas Flow Theory of Operation
1 - 38 046-006272-00 A7™ Service Manual
FIGURE 1-40
• Red arrows: direction of the fresh gas.
• Black arrows: direction of the patient's expired gas.
1.3.4.14.3 Gas Bench
As shown in the following figure, the gas bench is an internal path for the sample gas to return to the
breathing circuit at the patient breathing end. This path must ensure that the waste gas is filtered by
the CO2 absorber canister and then arrives at the inspiratory end of the patient. In this way, the waste
gas can be recycled, which increases the utilization of the anesthetic gas. In the following figure, the
red arrows indicate the direction of the anesthetic gas. Currently, this path is integrated into the main
unit of the patient breathing circuit.
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