Patent ID: 7172591

Claim:
An electric operation apparatus comprising: a high-frequency current generating means for delivering high-frequency output power with which high-frequency current is conducted to a living tissue for the purpose of remedy; an output changing means for changing high-frequency output power that is delivered by said high-frequency current generating means; and a control means for controlling the output changing means so that high-frequency output power is delivered intermittently to said tissue over a plurality of time intervals (n), said control means calculating a change in the impedance (Î”Zn) offered by a living tissue during each application delivery interval n, and comparing a value Î”Zn/Zsn, where Zsn is a measured tissue impedance offered at the start of the nth delivery interval, against a predetermined value implying completion of coagulation change, wherein if Î”Zn/ZSn meets a completion condition, the control circuit stops repetition of continuation and discontinuation of output power delivery, wherein after a first time interval, each successive power delivery interval is of equal to or a shorter time duration than an immediate prior interval to enable tissue coverage over a wide range.