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ESU-X 300NT_EN B
18.04.2018
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and a decrease of the output power into the application point (which leads the operator to raise it,
dangerously);
-
Never exceed 1/3 of the max. output power for each monopolar current when using the paediatric neutral
electrodes, or 1/5 when using the electrodes for babies;
-
Use the disposable neutral electrodes only once, by paying attention to the instructions on the packaging.
Make sure they have the right dimensions (standard for adults with “weight body higher than 15 Kg”:
approx. 136cm
2
; standard for children with “weight body from 5 to 15 Kg”: approx. 84cm
2
);
-
As the space between the neutral electrode and the operating area represents a sort of “path” for the HF
current, be sure that it is not diagonal as regards the body, nor on the heart. Remember also that the
metallic elements (prosthesis, catheters, etc.) on the path of the current may cause accumulations of
current with consequent heating/burns of the surrounding tissue;
12. Position the cables of the electrodes in a way that they do not touch the patient or any other conducting part.
During the operations, place the unused active electrodes on insulating materials, far away from the patient;
13. Always use the lowest possible power. Bear this warning in mind when intervening on patients (children or
babies) for whom small neutral electrodes are used (see also point 11);
14. Choose the bipolar technique, when operating on small portions of tissue or in cavities;
15. Try to respect as much as possible the suggested working times, and avoid useless short-circuits between the
active electrode and the neutral one;
16.
Get in contact with the Technical Service for the use of the “disposable” electrodes;
17. When the device is switched on, check all the settings before using it on the patient, and remember that a
failure can provoke an undesired increase of the power;
18. Remember that also the use of too low powers, if combined with some particular electrodes or accessories,
can cause side effects: for example, when using the Argon gas, the risk of embolism raises if the power of the
spray coagulation is not able to produce quickly a rapid and impermeable eschar on the target tissues;
19. The unit must not be used for final purposes other than those listed in this manual.
THE HF LEAKAGE CURRENTS CONTROL CIRCUIT
The unit is equipped with a leakage currents to earth control circuit because these currents represent one possible
source for undesired burns on the patient or the operators (i.e. a patient who gets in touch with a metallic part of
the operating table or with wet/damp towels, a patient who is placed on a water mattress for surgical needs, an
operator who gets in touch with instruments or endoscopes, etc. They all are possible causes of the increase of
such currents).
When the leakage currents to earth overcome 150mA (limit established by the rules), the circuit intervenes as
follows:
- It automatically reduces the output power, so that the leakage currents come back within the agreed limits;
- It gives an alarm signal to the operators (red Led
G-
HF LEAKAGE
on).
SAFETY CIRCUIT OF THE NEUTRAL ELECTRODE
The neutral electrode connection control circuit (Red Led - area
A
) operates in the following manners:
1)
With disposable/reusable electrodes with one single section (non split)
. The circuit controls if the neutral
electrode is connected to the cable, and if the latter is integral and correctly connected to the unit
(socket
NEUTRAL PLATE-7
). If this is not the case, it stops the delivery of the power and gives a luminous
alarm signal (the Red Led is lit, Error Code “no Np”) and a buzzer (loud, intermittent);
2)
With disposable/reusable electrodes with twin section (split)
. The circuit works as described above at
point 1, but it also checks if the quality of the contact between the electrode and the patient tissues is good
enough. It operates as follows:
a) When the contact is optimum, the circuit does not intervene;
b) When the contact decreases to less than approx. 50% of the surface of a standard electrode for adults
well attached, the circuit intervenes automatically reducing to max. 200W the output powers (if higher
levels have been selected);
c) When the contact further decreases, the circuit completely stops the delivery of the power, by giving a
luminous alarm signal (The Red Led is lit, Error Code “no Np”) and also a buzzer (loud, intermittent).
3)
When only the memories for the bipolar use (it does not require any neutral electrode) are selected
(memories from 96 to 99)
,
the circuit does not intervene (the 3 Led are lit, but only to show that the electrode is not connected).
INITIAL CHECKS
Initial checks
1.
Make sure that the mains power supply corresponds to the technical data (see the data label on the backside
of the unit), and connect the unit with the mains switch (
b2-green-
on the backside of the unit) off;
2.
For a possible equipotential connection, use the plug (
b4
on the backside of the unit), and the device (
b6
on
the backside of the unit) to adjust the functioning acoustic signals (the max. is clockwise). The alarm signals
cannot be regulated.
