Treatment apparatus and operation system

An operation system, comprising:

• an ultrasound transducer that is configured to generate ultrasound vibrations;
• a drive section that drives the ultrasound transducer by means of a drive signal;
• a probe that has a proximal end portion that is mechanically connected with the ultrasound transducer, and a distal end portion that can be brought adjacent to or in contact with a treatment target region of a treatment subject, the probe being configured to transmit ultrasound vibrations generated at the ultrasound transducer from the proximal end portion to the distal end portion;
• a physico-chemical parameter adjustment section that changes a physico-chemical parameter of the treatment target region;
• a detection section that detects a physical quantity that changes due to cavitations that are generated at the treatment target region by ultrasound vibrations of the distal end portion, based on the drive signal that is supplied to the ultrasound transducer;
• a treatment speed switching section that is configured to switch a treatment speed with respect to treatment target region;
• and
• a control section that controls 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 of the detection section.