High frequency burning power source 2 is the electric operation device in order junction the body tissue. Whether or not 2 times there is augmentation above specified value of the impedance to which as for the electric operation device, high-frequency power was supplied from the respective value of voltage and the electric current which are detected in the voltage of the high-frequency power which is output from the high-frequency power supply section and the high-frequency power supply section in order to supply the high-frequency power which is impressed in the body tissue and the sensing station and the sensing station in order to detect electric current was calculated and in the impedance calculation section and the impedance calculation section which calculate the impedance between electrode 3a of the pair which grips the body tissue, supply of high-frequency power from the high-frequency power supply section substantial of on the basis,It possesses with the control section 18 which controls halt.高周波焼灼電源2は、生体組織の接合を行うための電気手術装置である。電気手術装置は、生体組織に印加する高周波電力を供給するための高周波電力供給部と、高周波電力供給部から出力される高周波電力の電圧と電流を検出するための検出部と、検出部において検出された電圧と電流のそれぞれの値から高周波電力が供給されかつ生体組織を把持した一対の電極3a間のインピーダンスを算出するインピーダンス算出部と、インピーダンス算出部において算出されたインピーダンスの所定値以上の増加が、2回あるか否かに基づいて、高周波電力供給部からの高周波電力の供給と実質的に停止を制御する制御部18とを有する。
