Erbe ERBOTOM ICC 350 M, Instruction Manual

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6-3
Activation of current pulses during TUR
The Neurotest device is switched on and set via a remote control connected to the rear panel of
the unit. Via this remote control, the operating mode of the unit can be switched over from high-
frequency surgery (HF) to Neurotest (NT).
If the knob on the remote control is set at switch position 0, the unit is in the high-frequency
surgery operating mode. This is indicated by the signal lamp labelled HF. For switch positions 1-
5, the unit is in the Neurotest operating mode. This is indicated by the signal lamp labelled NT.
In addition, there is a display on the front panel of the ICC 350 T.
The stimulation current pulses of the Neurotest device are transmitted via the electrode handle
with electrode connected to the CUT/COAG2/NEUROTEST socket. This is activated via the
yellow pedal on the footswitch. The Neurotest device can only be activated in switch positions
1-5 on the remote control.
The high-frequency surgery operating mode is only active in switch position 0 on the remote
control or when the remote control is not connected.
Setting the intensity of the current pulses
The intensity of the current pulses can be set from 5 to 25 mA in five steps of 5 mA each. The
respectively set intensity is automatically and constantly controlled within the practically expected
resistance range.
Step 1 = 05 mA from 0 to 20.0 kOhm
Step 2 = 10 mA from 0 to 10.0 kOhm
Step 3 = 15 mA from 0 to 6.6 kOhm
Step 4 = 20 mA from 0 to 5.0 kOhm
Step 5 = 25 mA from 0 to 4.0 kOhm
Signaling of the current pulses
It is a prerequisite for clear identification of electrically stimulable tissue structures that current
pulses are actually present. If the unit did not provide any current pulses, for example due to an
interruption in the cables unnoticed by the user, and consequently no stimulation occurs, this
could erroneously lead to the belief that no electrically stimulable tissue structures are present in
the affected area.
For this reason, the NEUROTEST device only produces acoustic signals (beeps) if the current
pulses are flowing with at least 3 mA. Current pulses can only flow if the stimulation electrode
is in contact with electrically conductive tissue and the circuit is closed by the patient via the
neutral electrode.
Safety of the NEUROTEST device
The following safety-related functions of the NEUROTEST device in the ERBOTOM ICC 350 T
are automatically monitored:
a) When activating the NEUROTEST device, a test is first made as to whether a neutral
electrode is connected to the unit and to the patient (the latter only if a neutral electrode
with two contact surfaces is used). If there is an error, this is signaled visually and
acoustically.