Theory Of Operation; Mode Descriptions; Cut Major Modes; Coag Major Modes - ConMed Sabre Genesis Service Manual

Electrosurgical generator

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Table Of Contents

Table of Contents

Sabre Genesis™ functions and essential circuit information are provided in this section. This section begins

with a description of the key parameters for each mode. This is followed by an overview of how the system

functions and some key operational information for the modules within the system.

3.1

Mode Descriptions

The key functional parameters for each mode are presented here. Nominal mode specifications are provided

in section 1.2.11 of the Sabre Genesis™ Operators Manual.

3.1.1

Cut Major Modes

Major Mode

Minor Mode

Cut

Pure

Pulsed

Blend

3.1.2

Coag Major Modes

Major Mode

Minor Mode

Coag

Standard

Standard mode is fundamentally different from the Cut mode in that the resonant circuit of the RF Amplifier

and Transformer combination is excited by the energy of a single pulse, causing the resonant circuit to ring

until the energy is dissipated.

3.1.3

Bipolar Major Modes

Major Mode

Minor Mode

Bipolar

Macro

3.2

System Overview

Mains power is converted to electrosurgical output power through the RF Power Supply (RFPS), the RF

Amplifier, and the Transformer and Output sections of the system.

Mains power is converted to high voltage direct current power in the RFPS to supply the RF Amplifier.

This is essentially a power transformer with a power factor corrected regulator. The power factor correction

can be enabled or disabled under software control.

Pulses generated in the RF Controller are amplified to electrosurgical power and voltage levels in the RF

Amplifier and Transformer portions of the power train. Three high-voltage bipolar transistors and a single

MOSFET make up the hybrid-cascode RF Amplifier. The hybrid-cascode amplifier is a fast, high-voltage

amplifier that can be controlled by the combination of DC voltage (VBASE_PWM) and a fixed ampli-

tude, variable pulse width signal (RFGATE). This amplifier is combined through a relay with either the

Monopolar output transformer or the Bipolar output transformer to generate electrosurgical power.

Electrosurgical power flows from the RF Amplifier / Transformer section to the Output section where the

power is switched to the specific electrosurgical outputs. The Output section also has circuitry to detect