Control device

A control device for use with a treatment tool that includes a heating element, the control device comprising:

• an energy output source configured to transmit electrical energy to the heating element so as to apply heat to a treatment target;
• and
• a processor configured to be in electrical communication with the energy output source so as to control temperature of the heating element by controlling the output of the electrical energy from the energy output source, wherein
• the processor is configured
• to set a target temperature for the heating element and to control the output of the electrical energy so that the temperature of the heating element follows the target temperature,
• based on an output state of the electrical energy from the energy output source to the heating element, to set a target trend for an electrical characteristic value relating to the electrical energy, the target trend representing variations in the electrical characteristic value over time if the temperature of the heating element is maintained at the target temperature over time after the temperature of the heating element has reached the target temperature,
• based on satisfaction of a predetermined condition, to switch the control of the electrical energy, which is to be transmitted to the heating element from a first phase to a second phase wherein a first followability of the temperature of the heating element in the first phase is higher than a second followability of the temperature in the second phase, and
• to reduce the output of the electrical energy from the energy output source to the heating element so that the temperature of the heating element decreases to a temperature, at which no substantial tissue degeneration occurs in the treatment target, when a parameter is beyond a predetermined range wherein the parameter being defined as a fluctuation between the electrical characteristic value and the target trend.

A treatment system comprising:

• an energy treatment tool;
• and
• a control device configured to be attached to the energy treatment tool so as to enable the treatment system to conduct a treatment on a body tissue wherein
• the control device comprising an energy output source configured to transmit electrical energy to a heating element so as to apply heat to a treatment target, and
• a processor configured to be in electrical communication with the energy output source so as to control temperature of the heating element by controlling the output of the electrical energy from the energy output source, wherein
• the processor is configured by
• setting a target temperature for the heating element and controlling the output of the electrical energy so that the temperature of the heating element follows the target temperature,
• setting a target trend for an electrical characteristic value relating to the electrical energy, the target trend representing variations in the electrical characteristic value over time if the temperature of the heating element is maintained at the target temperature over time after the temperature of the heating element has reached the target temperature,
• switching the control of the electrical energy, which is to be transmitted to the heating element from a first phase to a second phase wherein a first followability of the temperature of the heating element in the first phase is higher than a second followability of the temperature in the second phase, and
• reducing the output of the electrical energy from the energy output source to the heating element so that the temperature of the heating element decreases to a temperature, at which no substantial tissue degeneration occurs in the treatment target, when a parameter is beyond a predetermined range wherein the parameter being defined as a fluctuation between the electrical characteristic value and the target trend.