Patent ID: 8579836

Claim:
An operation system, comprising: a treatment section that performs treatment of a treatment target region of a treatment subject by causing ultrasound vibrations generated by an ultrasound transducer to act on the treatment target region; a physico-chemical parameter adjustment section that changes a physico-chemical parameter that contributes to promotion and suppression of generation of a thermal energy in the treatment section; a detection section that detects a generation state of cavitations at the treatment region; a treatment speed switching section that is configured to switch a treatment speed with respect to the treatment target region; and a control section that causes a generation amount of cavitations at the treatment target region to be larger than the predetermined amount when the treatment speed set by the treatment speed switching section is faster than a predetermined speed, and causes a generation amount of cavitations at the treatment target region to be smaller than the predetermined amount when the treatment speed switching section is slower than the predetermined speed, by controlling the physico-chemical parameter adjustment section based on a detection result at the detection section.