And a electrosurgical generator and the electrosurgical instrument, the instrument has a longitudinal axis, electrosurgical system includes a third electrode of the first, second and at least. And are spaced from each other by an insulating member at least one between them, the electrode is greater than the distance between the first electrode and the second electrode distance between the first electrode and the third electrode. Electrosurgical generator, the first and comprising a second source of high-frequency energy that can generate a dissecting RF waveform for coagulation RF waveforms, and each being connected to a first of the electrosurgical instrument, the third electrode and the second and I have a third output connection. The generator further comprises a controller and switching means, when selecting for incision RF waveform between the second output connection and a first output connection, therefore the control unit, the second to the first electrode switching means I want to send the incision for RF waveform between the electrodes. When selecting coagulating RF waveform between the third output connection and a first output connection, thus switching means sending a coagulating RF waveform between the third electrode and the first electrode.電気外科用システムは、電気外科用器具と電気外科用ジェネレータとを含み、器具は、長手方向軸を有し、少なくとも第1、第2及び第3電極を含む。電極は、これらの間の1以上の絶縁部材によって互いに離間され、第1電極と第3電極との間隔は第1電極と第2電極との間隔よりも大きい。電気外科用ジェネレータは、凝固用RF波形又は切開用RF波形を生成できる高周波エネルギの供給源を含み、電気外科用器具の第1、第2及び第3電極に各々接続された第1、第2及び第3出力接続部を有する。ジェネレータは切換え手段と制御装置とを更に含み、制御装置は、切開用RF波形の選択時には、切換え手段が第1出力接続部と第2出力接続部との間に、従って第1電極と第2電極との間に切開用RF波形を送るようにする。凝固用RF波形の選択時には、切換え手段は第1出力接続部と第3出力接続部との間に、従って第1の電極と第3電極との間に凝固用RF波形を送る。
