Overview 7
1.2 Symbols used on the ventilator
Patient valve
The symbol on the patient valve indicates that
the lip and valve membranes in the expiration and
spontaneous breathing arms must be changed im-
mediately if they are crinkled, sticky or misshapen.
Under no circumstances continue to use the patient
valve for ventilation in this case, as malfunctions are
likely (note “7.4 Check of patient valve“ on
page 48).
The symbol indicates the correct position for
insertion of the lip membrane.
When connecting the patient valve, take care to
ensure that the direction of respiratory gas flow is
correct.
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