27/04/04 ©
Söring
Users manual RF-units
1
not valid for MBC600
-14-
generated and no direct contact is necessary. The spark over causes an extreme temperature rise
in the tissue areas close to the surface and destroys them (surface coagulation, eschar,
carbonization). Electrodes with a small area like small ball or needle electrodes are used.
The necessary high voltage with moderate RF power is reached by high pulse modulation. Peak
voltages up to 9kv
pp
are obtained by this method.
Spray coagulation is mainly used for a quick and widespread coagulation of tissue e.g. with
seeping hemorrhage. It should be noted that the frequently generated eschar causes bad healing
and after-bleeding.
3.2.5. Bipolar application technique
With bipolar application the RF current does not flow through the body of the patient but directly to
a second adjacent electrode of the surgical instrument (e.g. a tweezers leg). The advantage is
that the RF current only flows in an area where the surgical effect is wanted so that damage to the
surrounding tissue is largely avoided. Further advantages are the low power requirement and a
low disturbance effect (e.g. on measurement equipment). Fig. 3.8 shows a schematic
representation of bipolar application technique.
Isolation
Insulation
Isolierter
Pinzettenschenkel
Insulated Tweezers’ leg
Pinzettenspitze als
„Neutralelektrode“
Tweezers’ Tip as
„Patient electrode“
Pinzettenspitze als
„Aktivelektrode“
Tweezers’ Tip as
„Active electrode“
Fig. 3.8
This equipment provides the application techniques bipolar cutting
1
and bipolar
coagulation. As described in the previous chapters 3.2.1 and 3.2.2 a continuous
signal is also used for bipolar cutting. The coagulation occurs with a lower RF
voltage.
3.2.5.1 Bipolar Automatic
When the automatic function of bipolar been selected, the equipment switches on and off auto-
matically for coagulation of tissue as soon as a sufficient tissue contact between the tweezers
legs has been recognized by resistance measurement. If required the system can be switched off,
so that the bipolar instruments can be activated by the footswitch. (see also chap. 5.1. point 7)
ATTENTION:
Do not use Bipolar-Automatic-Mode (14) together with TissueLink Bipolar fluid
supported instruments. The irrigation fluid could disturb the recognition of the automatic function!!!
TissueLink fluid supported instruments have to be used only without activated bipolar automatic!
!
