Instructions for use Primus Infinity Empowered SW 4.5n 67
Assembly and preparation
For measurement purposes, a permanent side-
stream flow runs through the sample line to the pa-
tient-gas measurement module. In case of a
blocked HME filter or filter in this position at the
Y-piece, the measurement system would produce
negative pressure situations in the patient’s lungs.
Observing the resistance and compliance
During spontaneous breathing, higher resistance
values mean that the patient must do more breath-
ing work.
In volume-controlled ventilation, an increased re-
sistance has a slight effect on the applied volume
during the inspiration. However, the peak pressure
increases at a constant plateau pressure. For this
reason, the time constant increases during the ex-
piratory phase. If the expiration times are too short,
the lungs might not be emptied completely, result-
ing in a dynamic overfilling of the lungs (air trap-
ping).
In pressure-controlled ventilation, an increased re-
sistance can reduce the inspiratory or expiratory
volume.
WARNING
Risk due to additional components in breath-
ing circuit
When additional components are used or in
the case of hose configurations that differ
from the standard or recommended hose con-
figurations, the inspiratory and expiratory
breathing resistances may exceed the stand-
ard requirements.
If such configurations are used, the user must
pay particular attention to the measured val-
ues. Observe the instructions for use of the
additional components.
WARNING
Risk of increased rebreathing
If coaxial hoses are used, leakages between
the inner and outer hose cannot be detected
during the leak test.
To avoid insufficient gas exchange and re-
breathing of CO
2, monitor the measured gas
concentration extremely carefully.
WARNING
Risk due to misleading measured values
Replacing the breathing hoses, filters, vapor-
izers, or soda lime may change the calculated
leakage and compliance values of the an-
esthesia machine and affect the therapy.
– Perform a leakage and compliance test af-
ter replacing breathing hoses, particularly
extendable hoses, vaporizers, and soda
lime.
– Perform a leakage and compliance test af-
ter adjusting the length of extendable
hoses.
WARNING
Risk when adjusting the hose length
When the hose length is changed, resistance
and compliance may change. This can result
in an increased or reduced ventilation volume
for neonates.
Do not use extendable hoses, particularly for
neonates.
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