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14. Operational Considerations
14.1 General
14.1.1 Ventilation Off Mode
14.1.2 CPAP Mode without a Flow Sensor and
with the Apnoea alarm set to “OFF”
The user can when the flow sensor is removed
whilst in CPAP mode disable the Apnoea Alarm.
The user need to be made aware that the Backup
breaths function is now automatically disabled (the
ventilator displays a warning in the CPAP mode
panel). This mode of operation is not recommended
for invasive ventilation.
If the user changes mode or re-connects and
calibrates the flow sensor the Apnoea Alarm and
backup breaths are automatically enabled.
14.1.3 SIMV Mode without a Flow Sensor and
with the Apnoea alarm set to “OFF
The user can, when the flow sensor is removed
whilst in SIMV mode, disable the Apnoea Alarm for
breath rates below 10 BPM. The ventilator will
display the word “OFF” in the mode panel for the
apnoea alarm delay time. This mode of operation is
not recommended for invasive ventilation.
The user can enable the Apnoea Alarm at any time
by setting the Apnoea alarm delay to between 1 and
60 seconds. When the Apnoea alarm is enabled the
backup breaths function is also enabled.
14.1.4 Gas Input Pressures
The ventilator requires the gas input pressures to be
between 4-5bar. The ventilator can operate with the
gas pressures at 3-4bar, but when there is a high
demand for gas, No O
2
Supply or No Air Supply
alarms can be triggered. This is due to the supply
regulators becoming unbalanced as demand for one
gas exceeds its ability to supply. The imbalance is
recognized by the ventilator as being the absence of
one of the gases.
14.1.5 Mode Memory On Power Up
The ventilator retains the last ventilation mode and
settings for 1 minute after being powered down. Re-
starting the ventilator after 1 minute will cause it to
enter the Ventilation Off mode. If restarting within
the 1 minute memory period the user will have to re-
calibrate the flow sensor only, all other settings are
retained.
14.1.6 Backup Battery Power
The ventilator has a backup battery power supply
that will continue to operate the ventilator in the
event of mains power failure (45 – 60min depending
on the ventilatory mode being used). The operation
of the ventilator does not change when on the
reserve power supply.
It is recommended the ventilator be allowed to
charge the batteries by being connected to a mains
electricity supply for a minimum of 24 hours prior to
first use.
The ventilator does not have to turned ON to charge
the batteries. During use the ventilator will keep the
batteries fully charged.
In the event of a mains power failure a “Main Power
Fail” alarm will sound and be displayed in the alarm
panel. The alarm is high priority.
The user can suspend the “Main Power Fail” alarm
by pressing the Reset button when the “Main Power
Fail” alarm is present.
Once all battery power has been exhausted the
complete power fail alarm will sound and cease to
ventilate the patient.
Warning: The user should never enter
Ventilation Off mode when connected to a
patient. The ventilator does not ventilate in
this mode.
The user must use an alternative method of
detecting an apnoeic episode, whether
ventilating invasively or non invasively with
the Apnoea alarm turned “OFF”.
Note: The Apnoea alarm delay defaults to 60
seconds, and backup breaths defaults to
“OFF” when the flow senor is re-connected
and calibrated.
Warning: When the Apnoea Alarm is set to
“OFF” when in SIMV mode without the flow
sensor connected, an alternative method of
detecting an apnoeic episode must be used.
Warning: Disabling of the alarm in SIMV has
been allowed, so the user can use the
ventilator non-invasively. The ventilator
should not be used invasively with the
apnoea alarm disabled.
Warning. If the user suspends the “Mains
Power Fail” alarm, the next power related
alarm that will trigger will be the “Battery
Low” alarm. The user shall remove the patient
to an alternative form of ventilation at this
point if mains power cannot be restored.
Warning. The ventilator can be used with a
completely discharged battery, but a note
must be taken that in the event of a mains
power failure the ventilator will cease to
ventilate the patient.
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