Erbe 10128-002, Instruction Manual

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4.3.3 NESSY
The units in the ERBOTOM ICC model series are equipped
with a Neutral Electrode Safety System (NESSY), which
monitors both the electric connection between the unit and
neutral electrode as well as the correct application of the neutral
electrode on the patient.
When using neutral electrodes with only one contact surface, only
the electric connection between the unit and neutral electrode is
automatically monitored. If this connection is sound, the green
NESSY signal (LED) is illuminated and all operating modes can
be activated. If this connection is interrupted, the green NESSY
signal (LED) is not illuminated and the monopolar operating modes
cannot be activated. If an attempt is made in this condition to activate
a monopolar operating mode, the red NESSY signal (LED) is
illuminated and a warning signal is heard at the same time.
When using neutral electrodes with two contact surfaces, not only
the electric connection between the unit and neutral electrode is
automatically monitored, but also the application of the neutral
electrode on the patient. Here the electric conductance between the
two contact surfaces on the neutral electrode and the skin of the
patient is constantly measured automatically and compared with
the intensity of the high-frequency current that flows through the
neutral electrode.
If the intensity of the high-frequency current is greater than is permissible at the respectively
measured conductance, NESSY then produces visual and acoustic warning signals and the operator
should only continue to use the high-frequency surgery if an incision or hemostasis has absolute
priority. If the measured conductance between the neutral electrode and the patient is too small,
monopolar operating modes cannot be activated.
The diversity of neutral electrodes models for high-frequency surgery is very large. The ideal
neutral electrode, optimal for all applications, does not yet exist. To ensure the user a large
degree of freedom in the selection of the best suited neutral electrodes for his/her purposes,
NESSY is a flexible Neutral Electrode Safety System that can be adapted optimally to the neutral
electrodes selected by the user. For appropriate advice and adaptation to suit requirements, please
contact your local Erbe office (see Chapter Addresses).