Given the same expanded length but different morphing states of the sub-electrode (which means the length of stylet keeps constant), different RFA lesions with the same sectional area can be achieved by the change of cannula length, Figure 14B, and it indicates that our electrode is able to ablate malignant tumors with the same size but different shapes. In addition, the insertion pose (which means the angle and position) of electrode are restricted during the experiment to mimic the actual situation for the safety of operation, and RFA lesions with distinct positions are still achieved.