Functional Overview
Principles of Operation
Force FX-8C Service Manual 4-3
Functional Overview
The Force FX-8C generator is specifically designed to cut and coagulate
(desiccate and fulgurate) tissue during bipolar or monopolar
electrosurgery.
During electrosurgery, radio frequency (RF) current flows from the
generator to an active electrode, which delivers the current to the patient.
The resistance to the current, provided by the patient’s tissue and/or the
air between the active electrode and the tissue, produces the heat that is
necessary for the surgical effect. The RF current flows from the active
electrode, through the patient’s body tissue to the return electrode, which
recovers the current and returns it to the generator.
Instant Response Technology
The Force FX-8C generator automatically senses resistance and adjusts the
output voltage to maintain a consistent tissue effect across different tissue
density. This adjustment is based on the selected mode (bipolar or cut
modes only), the power setting, and the level of tissue resistance. For
details, refer to Instant Response Algorithm later in this section.
Ultrasonic Electrosurgery
The Force FX-8C generator works in conjunction with the Valleylab CUSA
System 200 and CUSA EXcel for procedures where ultrasonic
electrosurgery is desirable. When you connect a CUSA handpiece with
CEM nosecone to the generator for ultrasonic electrosurgery, the generator
limits the monopolar output power automatically.
• The maximum power setting for monopolar cut is 100 watts.
• The maximum power setting for monopolar coag is 70 watts.
When you activate the handpiece for cut or coag output, the Low cut
mode or the Desiccate 1 coag mode is in effect automatically. The
remaining cut modes and coag modes are not available.
For more information, refer to CEM Mechanism Switch and CEM Switch
Circuit later in this section.
Simultaneous Coag
When you simultaneously activate two monopolar instruments for coag
output, each receives a percentage of the coag power setting set for the
selected mode. The amount of power each instrument receives depends
on the tissue resistance sensed by the generator at each surgical site.
Generally, the site with lower resistance receives proportionately more
power. The combined total output power does not exceed the coag power
setting.
You can also use a CUSA handpiece with a CEM nosecone for
simultaneous coag when you connect a monopolar instrument to the
Monopolar 2 Instrument receptacle. Only Desiccate 1 coag is available; the
maximum power setting is 70 watts.
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