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24.4 Software and System Fail Protocols
The ventilator has been specifically designed to minimize the risk of system
failure and software programming error. This has been achieved by dividing the
system into individual subsystems that can operate independently and manage
themselves via a well defined and robust messaging system.
It is possible for the user interface to fail (no display), and the controller and
monitor can continue to operate normally and ventilate the patient, although the
user would not be able to change ventilation settings.
Furthermore the entire system is backed up from a rechargeable internal battery
which is periodically monitored to check its integrity. If the battery is not detected
then an alarm is provided. If the mains power fails then the system reverts to
battery and an alarm for this condition is displayed. A further alarm sounder in the
power supply itself also sounds independently of the monitor alarm. The battery
voltage is also monitored during battery use and a threshold alarm is given when
the battery starts to run low. This allows the patient to be transferred off the
system before all power sources are exhausted. This also protects the battery
from deep discharge damage.
Alarm 56. Alarm Controller Fail
Alarm message ....................................System Fail
Alarm sub message .............................Alarm Controller Fail
Priority of alarm ...................................56
Monitor mode .......................................All
Can alarm be muted ............................No
Sounder Priority...................................High
Alarm Description:
If the alarm controller fails this message is generated.
Action: Remove patient to alternative form of ventilation, then remove
ventilator from service.
Alarm 57. Complete Power Fail Alarm.
Type.......................................................Audible Only
Can alarm be muted ............................No
Alarm Description:
If both mains power and battery power fail this alarm is sounded.
Action: Remove patient immediately to alternative form of ventilation,
then remove ventilator from service.
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