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 electrically communicate with the treatment tool, the energy source apparatus including:
• an energy output source configured to output high-frequency electric power to the bipolar electrodes through a first circuit, a high-frequency current flowing through the treatment target between the bipolar electrodes, and the energy output source is configured to output heater electric power to the heater for generating heat through a second circuit, and
• at least one processor used to control the energy output source, the at least one processor being configured to:
• control an output of the heater electric power through the second circuit so that the heater reaches a target temperature and then maintains the heater at the target temperature,
• detect a parameter related to at least one of a temperature of the heater and the output of the heater electric power to the heater through the second circuit, the parameter including at least a rate of increase of the temperature of the heater with time, and
• set a threshold value used to stop or reduce the output of the high-frequency electric power supplied through the first circuit to the bipolar electrodes based on the detected parameter, the threshold value being set in regard to an impedance of the high-frequency electric power based on the detected rate of increase of the temperature of the heater, the threshold value of the impedance being used to stop or reduce the output of the high-frequency electric power.

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 electrically communicate with the treatment tool, the energy source apparatus including at least one processor used to control an energy output source, the method comprising:

• performing an output control process to control an output of the heater electric power through a second circuit so that the heater reaches a target temperature and then maintains the heater at the target temperature,
• detecting a parameter related to at least one of a temperature of the heater and the output of the heater electric power to the heater through the second circuit, the parameter including at least a rate of increase of the temperature of the heater with time, and
• setting a threshold value used to stop or reduce the output of the high-frequency electric power supplied through a first circuit to the bipolar electrodes while the treatment target is being modified by a high-frequency current applied to the treatment target, based on the detected parameter, the threshold value being set in regard to an impedance of the high-frequency electric power based on the detected rate of increase of the temperature of the heater, the threshold value of the impedance being used to stop or reduce the output of the high-frequency electric power.