Page 164
Verify that:
after 10 seconds that
the ventilator delivers
a backup breath and
the visual and audible
Apnoea alarm is
triggered.
Step 15. Set the Backup Breaths button to Off.
Step 16. Gently constrict the proximal airway tube
so as to increase the pressure. Allow the pressure
to increase but do not allow it to exceed the high
alarm threshold. (This can be achieved by releasing
the constriction of the proximal airway tube by a
small amount.)
Do not reset any Apnoea alarms that may be
generated.
Verify that:
after 10 seconds the
“Continuing Positive
Pressure” alarm is
triggered and that the
fresh gas supply is cut
off.
When the gas supply is cut off release the
constriction from the proximal airway tube.
After 6 seconds the fresh gas supply should be re-
instated.
Step 17. Press the reset button in the alarm panel to
clear all alarm notifications.
Step 18. Press the
Mode Select
button
and select CMV from
the Mode Select
panel, but DO NOT
press the confirm
button. Advance to
Step 19.
Step 19. Set the following parameters in the CMV
preview mode:
BPM 30
Ti 1 sec.
PEEP 5mbar
PIP 20 mbar
O
2
%21%
Step 20. Press the confirm button to enter
the CMV mode.
Verify
a waveform appears in all the
waveform windows and that they
correspond to the set parameters.
Note: Functional testing with a flow sensor,
but with the patient circuit occluded, the
“Breath Not Detected” alarm will be triggered
on the second mechanical breath. This is
because the ventilator registers the second
mechanical breath via the flow sensor as an
incomplete patient breath. When functionally
testing without the flow sensor, only the
Apnoea alarm can be triggered as there is no
“Breath Not Detected” alarm in this mode of
operation.
Action: If the ventilator fails any of the above
tests (steps 9 to 18) then perform the
following actions in the order suggested
below. After each action retest the ventilator.
If the ventilator successfully passes all these
tests after performing one of these actions go
to Step 19.
• Check the patient circuit is set up correctly
as shown in section 12. on page 58:
Ventilator Set-up. Pay close attention to
proximal airway, fresh gas connection and
the expiratory limb.
• Check the silencer to ensure it is not
adding exhaust gas resistance due to it
becoming restricted.
• Check the test lung and replace if
necessary.
• If the fault continues after checking all
possible causes, remove the ventilator
from service and contact an SLE approved
engineer.
To Next Page
Loading...
