Multi-electrode ablation device

A device for radio frequency ablation, for delivering energy in the trachea and bronchus, characterized in that:

• said device being able to generate and control direct current, alternating current and radio frequency energy;
• collect, process and display temperature, impedance or tension signal;
• and determine effectiveness of an ablation. according to change of impedance, said change of impedance is one or more parameters selected from the group consisting of fall in impedance, rate of change in impedance, a change in rate of change in impedance, and a change from falling in impedance Co rising in impedance,
• wherein said ablation is determined Co be effective when said fall in impedance exceeds 10Ω to 100Ω, or said rate of change in impedance is higher than −1 Ω/s to −50 Ω/s, or said impedance changes from failing in impedance Co rising in impedance,
• wherein said device for radio frequency ablation uses a segmentation control method via a closed-loop control system to adjust a radio frequency output power so as to control an ablation temperature, said segmentation control comprises:
• (1) a fast heating phase:
• lasting for 0.5 s to 2 s from the beginning of ablation to reach a fast heating phase end point temperature that is 50% to 80% of said ablation temperature;
• (2) a slow heating phase:
• lasting for 0.5 s to 2 s after said fast heating phase to reach a slow heating phase end point temperature that is 70% to 99% of said ablation. temperature, or is 0.1° C. to 10° C. lower than said ablation temperature;
• and (3) a stable maintenance phase:
• temperature is stably maintained after said slow heating phase until the ablation is stopped.