Mode Of Operation - Aesculap Nelson delux GN 640 Mode D'emploi

High frequency surgical device
For a detailed description of the additional function autoCOAG off see
Special settings (Menu Special Functions) and for the Vario-function
see Activating the high frequency.
Bipolar techniques
In bipolar incisions and coagulation, good incision and coagulation re-
sults can be achieved with low power settings.
Since neutral electrodes need not be applied, the risk to the patient as-
sociated with them is eliminated.
Note
With the bipolar technique, optimum results (especially in minimally
invasive surgery) can only be achieved with special instruments, see
Aesculap brochure C-304-81.
Bipolar incisions
Bipolar coagulation
BICUT 1
Incisions with bipolar instru-
ments (e.g. Aesculap BITOM
instruments)
BICUT 2
Incisions with bipolar scissors
(e.g. Aesculap Metzenbaum
scissors PM 400 R)
BICOAG
Dosage 0.1—19.5:
Microsurgical application with
fine instrument tips, tissue
sparing coagulation with
strong depth effect
Dosage from 20:
Coagulation with the entire
range of bipolar coagulation
instruments
Additional functions
supported: autoCOAG on/off;
power-on delay, Vario-function
(GN 640)

2.3 Mode of operation

The high-frequency surgical device
cessor-controlled and transforms the mains voltage into a high-fre-
quency alternating current for monopolar and bipolar application.
In monopolar operation, the device can be activated either by a handle
with fingertip buttons or through a pedal control; in bipolar mode, the
device is activated through an instrument with fingertip buttons,
through a foot pedal or via the autoCOAG function.
It is not possible to activate several outputs simultaneously.
Data memory functions
With the push of a button, the user can create their own device set-
tings and call up empirical data previously entered into the system
(see Working with the device).
As on any computer, the data saved remains in the device memory
even when the device is switched off.
Monitoring functions
Self-test
When switched on, the device automatically conducts a self-test that
assesses operational components, the warning signal, the micropro-
cessor and hardware functionality.
Ongoing tests while in operation
Safety-relevant functions and signals are cyclically tested while the
device is in operation. If any fault is detected, the HF generator
switches off. The display shows an error message (see Error messages
on the display). The device makes a distinction between operational
errors and device errors.
Neutral electrode monitoring
The neutral electrode monitoring function minimizes the risk of burns
at the neutral electrode application site. When an error is detected,
the monopolar HF generator switches off and cannot be activated.
It is possible to continue working in bipolar mode.
The following events are monitored:
• Undivided neutral electrode (type 1):
When the connection between a neutral electrode and the HF de-
vice is severed, or the plug is disconnected, an error message ap-
pears on the display.
• Divided disposable neutral electrode (type 2)
- or -
Reusable divided neutral electrode with isolated outer surfaces
(type 3):
When a divided neutral electrode is used, the PDM system (Perma-
nent Dynamic Monitoring System) also checks if the neutral elec-
trode is in correct contact with the patient. If an error is detected
(e.g., the neutral electrode is partially detached from the patient),
an error message appears on the display.
(GN 640) is micropro-
37