The independent tunability of active cannula and pre-curved stylet inside and their following interactions in each sub-electrode contributes to the shape morphing of our electrode. These sub-electrodes are individually-controlled for two major advantages. On the one hand, the trajectory of individual sub-electrodes can be predicted for ablation of target tissues. On the other hand, combined with energy control, diverse sizes and shapes of RFA lesions can also be achieved by combining different electrode shapes, Figure 2B. Such advantages have been verified in later ex vivo experiments of irregular RFA lesions. Compared with the commercial electrodes, our electrode can change the shape of RFA lesion and ablate the target tissue on demand.