Dräger Fabius 4116029 Technical & Service Manual page 26

Function Description
Spontaneous Breathing: Expiration
During expiration, the inspiratory valve 1 remains closed thus preventing the
expiratory gas from flowing back into the inspiratory branch.
The APL valve 2 is open, irrespective of its pressure setting.
The expiratory gas flows from the lung 3 through the expiratory hose 4, the flow
sensor 5, the PEEP control valve 6, the expiratory valve 7, and through the absorber 8
into the breathing bag 9. At the same time, new fresh gas flows into the breathing bag.
When the breathing bag is full, any excess gas mixture flows through the non-return
valve 10 into the anesthetic gas scavenging system.
fresh gas
10
Fig. 16: Spontaneous breathing (expiration)
The CO is scrubbed from the expiratory gas by the soda lime contained in the
2
absorber 8. The fresh gas replaces the anesthetic and oxygen taken up by the
patient.
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1
9
8
7
6
2
SPONT/
IPPV
2-18
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3
4
5
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Fabius