Ventilator Safety Features; Behaviour During Lack Of Fresh Gas - Dräger Fabius OS Instructions For Use Manual

Operation

Ventilator Safety Features

– High pressure safety relief valve (A)
– Negative pressure safety relief valve (B)
– Ventilator chamber pressure sensor

Behaviour during Lack of Fresh Gas

Background
Due to a very low fresh-gas flow or an excessive
leakage in the breathing system, a lack of fresh gas
can occur. This can be recognised by observing the
gradual emptying breathing bag.
NOTE:
The user should then take action to resolve this, for
example by increasing the fresh-gas flow.
Fabius OS behaviour in case of no action taken
by the user
– breathing bag gradually empties completely
– after two more strokes the alarm
»FRESH GAS LOW« and additional alarms
occur
– the ventilator absorbs its reserve volume since
it is not supplied with sufficient fresh gas.
As long as a lack of fresh gas exists, the safety
valve (B) for ambient air is opened during expira-
tion.
CAUTION
If remedial actions are omitted, ambient air will be
taken in which will dilute the fresh gas.
The concentration of (e.g.) oxygen or other
anesthetic gases will decrease.
Advantages: Even in extreme cases emergency
ventilation with limited V
shutdown of the ventilator does not occur.
88
is possible. A "sudden"
T
A B
Instructions for Use Fabius OS SW 3.n