5.1.5 Automatic ventilation
The fresh gas delivery is designed to be cost
effective with regards to agent consumption.
The fresh gas flow is thus limited to the set
minute volume, i.e. the delivered fresh gas can
never exceed the set minute volume.
A larger proportion of the fresh gas is added
during the inspiration phase, also contributing
to minimizing agent consumption. The set
fresh gas flow is the mean of fresh gas flow
delivered during a full breathing cycle.
Inspiration
In automatic (controlled) ventilation, reflector
gas is used to mechanically push the exhaled
gas mixture in the volume reflector, back into
the circle system. The mixture passes through
the CO
2
absorber, washing the gas free of
CO
2
, before re-administration to the patient.
The gas mixture from the volume reflector,
along with new fresh gas, form the patient's
tidal volume. This ensures precise delivery of
the tidal volume irrespective of changes in the
fresh gas flow.
4
5
7
8
6
19
2
3
Direction of gas flow is indicated by the
arrows.
1. Air gas module
2. O
2
gas module
3. N
2
O gas module
4. Vaporizer
5. One-way valve
6. CO
2
absorber
7. Flow transducer
8. Volume reflector
9. Reflector gas module
72
FLOW-i 4.2, User's Manual
| 5
| System functionality |
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