Hoffrichter CARAT II pro, User Manual

Page: 55 / 202

Chapter 4: Commissioning 55
SETTING AN ALARM TO DETECT DISCONNECTION
OF THE TUBE SYSTEM
When filters or other components are used in the tube system, an increased resis -
tance is created which often prevents a disconnection from being detected. Con-
sequently, the device does not give an alarm. This represents a life-threatening risk
for patients who are dependent on ventilation. The alarms should therefore be set
so that an alarm is triggered in the event that a disconnection occurs. The alarm
settings shown in Table 2 are suitable for detecting a disconnection.
If changes are made to the tube system, the alarms must be retested and
their effectiveness checked.
For a disconnection to be reliably detected, the alarms must be adapted
to the tube system and the patient. Then perform a disconnection test (see
page 53). We recommend a disconnection test both at the patient end and
at the ventilation device. Adjust the alarm settings accordingly. If the alarm
is not reliably activated, alternative monitoring must be carried out.
Table 2: Alarms for detecting a disconnection
Tube system Pressure-controlled modes Volume-controlled modes
Single line patient
circuit Min. Pressure , Apnoea Alarm,
High Inspiration Volume,
High Minute Ventilation, Low SpO
2
Low Pressure , Apnoea Alarm
Double line patient
circuit Min. Pressure , Apnoea Alarm, High Inspiration Volume,
High Minute Ventilation, Leak Rate, Low SpO
2
The disconnection test is performed as follows:
After setting the alarms, you should check whether the alarm(s) is/are triggered.
1. Start ventilating the patient and let the ventilation run for a few breaths.
2. Disconnect the tube system directly at the patient.
3. Check whether at least one of the set alarms is activated.
4. Then reconnect the tube system. The alarms should switch off again auto-
matically.
5. Repeat the alarm test by disconnecting other connections within the tube sys-
tem.