42 Functional checks
7.3 Checking patient hose system
Checking reusable hose system
1. Dismantle the patient valve.
2. Carry out a visual check of all the components
for cracks or other physical damage.
Crinkled, sticky or misshapen lip membranes
must be changed immediately. They must never
be used during ventilation as they can cause
serious functional disturbances.
3. Reassemble the patient valve.
When reassembling, make sure that the lip
membrane is correctly positioned.
Checking disposable hose system
Visual inspection
Check the following items by inspecting the patient
hose system:
• the patient valve and the connectors may not ex-
hibit any external damage, cracks or dirt.
• the hose connections must be located firmly and
securely on the connecting pieces.
• the patient valve and emergency air membranes
may not exhibit any damage or deformation.