GE Datex-Ohmeda Aisys Carestation Reference Manual page 79

Manual expiration
AP Airway Pressure
B
Bag/Vent switch to Bag
FG Fresh Gas
SGR Sample Gas Return
4
Expiratory flow
5 Flow to bag
Figure 2-34 • Flow during manual expiration
M1046983 04/08
The Bag/Vent switch keeps the ventilator path closed (B).
Gas flows from the patient (4), through a unidirectional valve (expiratory check valve),
and into the bag (5).
During exhalation, fresh gas flows backwards through the absorber (FG) into the
expiratory limb, downstream of the expiratory check valve.
For machines that are plumbed to return sample gas to the breathing system, the
returned gas (SGR) enters the breathing system after the expiratory check valve.
B
5
AP
FG
SGR
5
FG
2 Theory of Operation
4
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