Supplementary Figure 1. Representative images of the dedicated RF wire system, electrified guidewires (EG) and respective dilators using an optical microscope at (A) 3mm dilator-wire tip distance and various power settings, or (B) 5mm dilator-wire tip distance at 35W power. The RF wire system showed no signs of damage. In both 0.014” and 0.032” EG setups, the metal wire tip was melted and/or deformed, and the respective dilator showed signs of melting and charring. (Scale bar is 1mm.)