The high frequency generator (100) for the electrosurgical instrument (200) includes a power source (104) that generates power and a resonant circuit that excites a high frequency signal. The resonant circuit includes a parallel resonant circuit (106) connected to the power source (104) and a series resonant circuit (110) coupled to the parallel resonant circuit (106) and connected to the electrosurgical instrument (200). . The parallel resonance circuit (106) has a parallel resonance frequency higher than the series resonance frequency of the series resonance circuit (110). This improves the driving efficiency when the load (Z) of the living tissue treated by the electrosurgical instrument (200) is high, and improves the stability when the load (Z) is high.電気手術器具(200)のための高周波発生器(100)は、電力を発生させる電源(104)と、高周波信号を励起する共振回路とを含む。共振回路は、電源(104)と接続される並列共振回路(106)と、並列共振回路(106)に結合されるとともに電気手術器具(200)に接続された直列共振回路(110)とを含む。並列共振回路(106)は、直列共振回路(110)の直列共振周波数よりも高い並列共振周波数を有する。このため、電気手術器具(200)が処置する生体組織の負荷(Z)が高い場合における駆動の効率が改善するとともに、負荷(Z)が高い場合における安定性が向上する。
