Utah Medical Products Finesse ESU-110 Service Manual Download Page 12

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The negative-feedback output stage limits the output voltage under
high resistance loads. The same feedback circuit attempts to main-
tain the output voltage under low resistance loads so that the cutting
characteristics are quite uniform throughout the entire cut. See

Figure 3

and

Figure 4

for output power vs. load data for cut, blend

and coag modes. Cut mode maximum output power is 150 watts at
200

patient load.

Output Power vs. Displayed Setting

The output of the Finesse

unit increases linearly with adjustment of

the front panel output settings.

Figure 5

and

Figure 6

show the typi-

cal output power of each of the five modes over the full control
range. Both curves shown indicate output at 500

load resistance.

Output Safety Circuit Specifications

The Finesse

system is equipped with a safety circuit that monitors

the output signal levels and disables all unit functions when the out-
put exceeds the expected "nominal" output. The alarm system can
only be reset by turning off the main power switch.

The output safety alarm system will activate if the output voltage
exceeds 180 volts rms or exceeds the nominal output voltage by
50%, whichever is greater.

Audible Tone/Alarm System

Volume:

65 dBA min @ 1m (3.3 ft)

Frequency:

Cut

0.8 kHz nominal

Coag

1.5 kHz nominal

Alarm 3.0 kHz nominal

Smoke Evacuator System

Supply Voltages (all voltages are AC rms)

Nominal Voltage:

115 volts

230 volts

Operating Range:

90-140 volts

180-280 volts

Frequency:

45-65 Hz

Maximum Supply Current and Power

At the Nominal Voltage, the maximum supply current is 2 amps.
Maximum supply power for the ESU-110 is 230 watts and for the
ESU-220 is 460 watts.

Overcurrent Protection

The smoke evacuation motor is protected by a 3 amp fuse in the hot
lead.

Air Flow vs. Supply Voltage

At a supply voltage within the Regulated Range, the air flow through
a new disposable filter coupled to a 15 cm long 7 mm ID tube is not
less than 100 liters per minute (3.5 cubic feet per minute) at the
"high" setting and not less than 70 liters per minute (2.5 cfm) at the
"normal" setting.

Smoke Evacuation Duration

The smoke evacuation system will begin running immediately on
activation of the electrosurgery module and remain running five sec-
onds after the output power is deactivated.

Disposable Filter Cartridge

The Finesse

Filter Pack, catalog number ESU-501, consists of a

pleated HEPA paper filter followed by a compartment containing
activated charcoal.

Filter Life

The Finesse

Filter Pack, to ensure total elimination of odors between

procedures, should be replaced on a daily basis. However, the
three-stage filtration system has been tested to effectively remove
odors and particles for up to 15 electrosurgical procedures. Over a
period of time the external disposable filter pack can be a source of
odor and possible viral contamination. Therefore, it is recommend-
ed that the external filter pack be changed every day or after 15 pro-
cedures if more than 15 procedures are performed in a single day.

Finesse Service Manual