Energy source apparatus

A treatment system comprising:

• a treatment tool having a heater and bipolar electrodes to grip a treatment target;
• and
• an energy source apparatus used to supply electrical energy to the treatment tool wherein:
• the energy output source outputs high-frequency electric power to the bipolar electrodes so as to cause a high-frequency current to flow through a treatment target between the bipolar electrodes, and outputs heater electric power to the heater so as to cause the heater to generate heat, and
• a processor controls the output to the respective bipolar electrodes and the heater, wherein the processor:
• causes the high-frequency electric power to be output to the bipolar electrodes and detects a parameter that varies depending on tissue volume of the treatment target and wherein the parameter being related to (i) impedance of the treatment target and/or (ii) the output to the bipolar electrodes;
• sets a target value based on the detected parameter, the target value being related to an output control process for controlling the output to the heater;
• controls the output to the heater based on the target value so as to modify the treatment target with the heat of the heater;
• and
• with respect to a smaller tissue volume, increases the output to the heater and increases a temperature of the heater until at least a predetermined point of time after starting the output control process for controlling the output to the heater based on the target value.

A method of operating a treatment system having a treatment tool including a heater and bipolar electrodes to grip a treatment target and an energy source apparatus used to supply electrical energy to the treatment tool, the energy output source outputs high-frequency electric power to the bipolar electrodes so as to cause a high-frequency current to flow through a treatment target between the bipolar electrodes, and outputs heater electric power to the heater so as to cause the heater to generate heat, the energy source apparatus comprising at least one processor to control the output to the bipolar electrodes and the heater, respectively, wherein the at least one processor:

• causes the high-frequency electric power to be output to the bipolar electrodes and detecting a parameter that varies depending on tissue volume of the treatment target and wherein the parameter being related to (i) impedance of the treatment target and/or (ii) the output to the bipolar electrodes;
• sets a target value based on the detected parameter, the target value being related to an output control process for controlling the output to the heater;
• controls the output to the heater based on the target value so as to modify the treatment target with the heat of the heater;
• and
• with respect to a smaller tissue volume, increases the output to the heater and increasing a temperature of the heater until at least a predetermined point of time after starting the output control process for controlling the output to the heater based on the target value.