E-IM54f
P21/37
TD830
ELECTROSURGICAL UNIT
Bipolar mode
5.42 Bipolar output is always available irrespective of what
demands USER 1 and USER 2 are making from the
monopolar outputs.
CAUTION
Only fully insulated bipolar forceps should be
used to ensure that accidental contact between
the legs of the forceps and body tissue does
not cause electrosurgical action.
Selecting bipolar Forceps
5.43 Always use fully insulated forceps to ensure safety
for the operator and patient, and do not use direct switched
forceps, three core type.
Connecting Forceps
5.44 Select bipolar forceps (Fig. 9) to suit the surgical
procedure, and plug them into the bipolar forceps cable.
Connect the cable to bipolar output socket (31).
Changing Forceps
5.45 To change the type of forceps during use, e.g. from
bayonet to straight, set mains switch (42) to ‘O’ (‘off’)
change forceps, and then switch to ‘I’ (‘on’). Alternatively,
unplug the bipolar cable from the unit, change the forceps,
then plug the bipolar cable back into the unit.
Footswitches
5.45 Two types of footswitch can be used in bipolar mode:
♦
A white pneumatic footswitch (REF 83-581-68, Fig.10)
which is a light-action bellows type, with a push-on
connector tube.
♦
A white electric footswitch (REF 83-581-76, Fig.10).
5.46 The type of footswitch used is a matter of personal
choice. The pneumatic type has a very light action and is
suited to procedures where repetitive actuation is needed.
Note:
♦
Only one bipolar footswitch should be connected to
the unit at any time.
Power Output
CAUTION
Set power output control (1) to ‘minimum’.
(see section 3)
5.47 The bipolar mode is extremely safe, but it is always
good practice to start at a low setting and increase slowly
until the required effect is obtained. Bipolar coagulation of
most blood vessels is normally self-terminating because
the rapid rise in tissue resistance, brought about by
coagulation, limits the flow of current. An audible ‘pop’
can result from the rapid boiling of liquids in the tissue.
5.48 Press micro bipolar selector touch button (3) to
select micro bipolar mode or press macro bipolar selector
touch button (5) to select macro bipolar mode. The green
indicators (2) or (4) will illuminate to show which bipolar
mode has been selected.
5.49 Set power output control (1) to the required level.
Note that the digital power display (6) shows the
typical
available output power for either power range. (see 5.41
for range control selection).
5.50 Activation of the connected footswitch will turn on
the power for as long as the footswitch is depressed.
Notes:
♦
Blue power activated indicator (7) will come ‘on’ and
the running tone will sound only when the output is
activated (see 5.34 for adjustment of volume).
♦
The 15W (micro) range should be used initially if the
power level required is not known.
♦
The method of ‘constant amplitude’ power control
provides very effective coagulation at low power
levels.
After use
5.51 After using the electrosurgical unit, switch ‘off’ the
mains switch (42) and disconnect it from the mains power
supply.
Disconnecting accessories
5.52 When disconnecting active cables or footswitches
from the electrosurgical unit, always hold the connector(s)
not the cable.
Power output selection guide
5.53 Various makes of electrosurgical units have different
maximum output powers for their modes, and, more
importantly, they have different power output curves. These
characteristics determine the actual power delivered to the
tissue for a given control setting. The TD830 electrosurgical
unit has a power curve that rises at the low resistance
end, this ensures that adequate power is available for
demanding surgical procedures. This power curve shape
also enables the full range of power control settings to be
used, low values for general or delicate surgery, or high
values as shown in Table 1. All power curves are provided
at the end of this section.
5.54 The best results are obtained by varying the setting
rather than having a predetermined value for all uses. It
must be noted that digital power displays, only display the
typical available power for a given control setting. This is
proved by the fact that the displayed value does not change
between the active electrode being out of contact with the
tissue (zero power) or deeply embedded in well perfused
flesh (near maximum power delivered).