Cutting current uses a pure, nonmodulated sinusoidal waveform (Fig. 1). This waveform achieves a higher average power when compared with any other alternating waveform of equal peak voltage, allowing the voltage to be limited when compared with coagulation current. The high average power creates a higher current density than is allowed by other waveforms, facilitating a smooth cutting action without extensive thermal damage.
Fig. 1. Cutting current: a pure sine wave.
COAGULATION CURRENT.
Coagulation current is characterized by extensive wave modulation, which produces intermittent bursts of damped sine waves of high peak voltages (Fig. 2). These peak voltages result in high tissue temperatures, and hence significant thermal destruction, making this type of current particularly suited for the coagulation of bleeding vessels.
Fig. 2. Coagulation current: intermittent bursts of high voltage current.
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