12 Description of ventilator
in the patient valve ensures that the expiration gas
can be exhaled through the expiration arm.
Regardless of the ventilation mode selected, the pa-
tient has the option of breathing spontaneously be-
tween ventilation strokes via the patient valve. In
this case, the patient draws air for breathing from
the ambient air.
With the Air Mix setting, in the case of mechanical
ventilation, atmospheric air is admixed to give an O
2
concentration generally of between 55 % and 85 %
at 10 mbar ventilation pressure (note “11.5 O
2
con-
tent when using Air Mix“ on page 72).
In certain indications and in cases where the surround-
ing atmosphere is contaminated, you can switch to
No Air Mix and ventilate with pure oxygen.
The injector unit is switched off when switching
from
Air Mix to No Air Mix. This increases minute vol-
ume which can result in the set pressure limit being
exceeded and a stenosis alarm (Stenosis) being trig-
gered. In this case, set minute volume correspond-
ingly
lower.
In the opposite instance, in other words when
switching from
No Air Mix to Air Mix, the injector
unit is switched on. This reduces minute volume
which can lead to the set pressure limit being
under-
shot
. In this case, set minute volume correspondingly
higher.
No Air Mix
Air Mix
No Air Mix
Air Mix
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