User manual

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function, namely with leakage currents and functional currents flowing from the high-

frequency apparatus via undesirable paths through the patient or the attending staff.

When using an electrosurgical apparatus, direct connection of the patient with the

apparatus cannot be avoided. As the ESU is powered by the

230 V/50 Hz electrical

distribution network, there is a danger in the form of leakage currents on the network

frequency (and their higher harmonic components). Leakage currents are understood as

parasite currents flowing between mutually insulated parts of the apparatus, mostly through

parasite capacity couplings between these parts.

Connect the active electrode of the electrosurgical apparatus in the right grey socket,

and the neutral electrode in the left blue socket. Then connect the yellow and the left green

socket, and the right blue and the left grey socket via a short connecting cable. (Note: yellow

socket = active, green = ground, blue = dispersion, grey = leakage currents). Set the resistance

on the tester to 200 Ω. After that, make sure you really selected the current measurement. If

not, then use the ENT button to select mA (Fig. 7.3). The electrosurgical unit is switched to

the monopolar mode. If everything is right, activate the apparatus via the foot switch and

measure the ESU leakage currents in all the four modes gradually (section, mixes section,

coagulation, microcoagulation). Use the middle knob on the ESU main panel to gradually

select the performance from the MIN position all the way to the MAX position (Fig. 7.1 and

7.2).

Proceed likewise for the bipolar mode measurements, only following the instructions

in the operation manual [7.5] relating to operating the apparatus in bipolar mode.

For all the measurements, make use of the possibility of connecting the RF 303 tester

to the oscilloscope and display the course of the actuating signal in the individual modes and

functions of the electrosurgical generator CLINIC 170W. Record the measured results in Tab.

7.7 and 7.8.

Apparatusandaidsused

• Electrosurgical generator SMT BM CLINIC 170W, neutral electrode for repetitive

use, foot switch and interconnecting conductors (Speciální Medicínská Technologie,

s.r.o., Czech Rep.)

• Analyzer of electrosurgical devices RF 303 (Fluke Biomedical, USA)

• Interconnecting conductors and crocodile clips (RF 303 accessories)