Dräger Fabius plus - Safety functions of the ventilator; Behavior with too low fresh-gas supply; Behavior of Fabius if the user does not take any action

Operation
108 Instructions for use Fabius plus SW 3.n
Safety functions of the ventilator
– Overpressure safety valve (A)
– Underpressure safety valve (B)
– Pressure sensor in the ventilator chamber
Behavior with too low fresh-gas supply
For very low fresh-gas flow or an extremely large
leakage in the breathing system circuit, there can
be insufficient fresh gas. This is detected by the
gradual emptying of the breathing bag.
Behavior of Fabius if the user does not
take any action
– Breathing bag empties completely little by little.
– After 2 more mechanical breaths, the FRESH
GAS LOW !! alarm and other alarms are
triggered.
– Since the ventilator does not contain sufficient
fresh gas, the reserve volume is absorbed.
As long as there is insufficient fresh gas, the safety
valve (B) for ambient air remains open during
expiration.
This allows for emergency ventilation with limited
VT even with extremely low fresh-gas supply.
There will be no sudden switch-off of the ventilator.
20979
NOTE
To remedy this, the user must take actions, e.g.,
increasing the fresh-gas flow.
A
B
CAUTION
Risk of patient recovering consciousness
If the gas supply fails completely, further
operation of the anesthesia machine takes place
with gas supply with ambient air. Anesthetic
agents are no longer delivered and the
inspiratory anesthetic gas concentration in the
breathing gas decreases.
Monitor the gas mixture carefully and use
intravenous anesthetic agents if need be.