목적: For an ideal cochlear implant system, the electrodes should be fully inserted without damaging the internal structures of the cochlea. In this study, the newly developed electrode was inserted into the fresh- frozen human temporal bone and CT imaging was performed to evaluate the insertion angle, length of the intracochlear electrode, and inadequate insertion such as tip fold over. 방법:The electrodes were inserted into 17 fresh-frozen temporal bones via standard cochlear implantation procedure. The temporal bones were extracted and frozen within 72 hours of death of the donor. The electrode was made of platinum-iridium and silicon: the same materials as the existing commercial electrodes. It was a lateral wall electrode with an active length of 20 mm, 32 contacts, and 0.625 mm pitch. The diameter of the electrode was 0.45 x 0.35 mm at the apex and 0.8 x 0.6 mm at the base. Routine posterior tympanotomy and round window approach was performed for electrode insertion. One experienced surgeon and one trained surgeon inserted the electrode through the round window and fixed it with glue. MicroCT imaging was performed to measure the number, length, and insertion angle from the round window of the inserted electrodes. 결과:Thirty-one to thirty-two electrode contacts were inserted in all the temporal bones without resistance (31 contacts in 2, and 32 contacts in 15 temporal bones). Tip-fold over, kinking, and migration of the electrode were not observed in any of the cases. The insertion length was between 20.2 and 20.8 mm, with an average of 20.7±0.2 mm. The insertion angle was between 307.10 and 461.77°, with an average of 388.05±47.55°. The insertion angle was larger than 360° in 14 cases (82.35%). According to the human cochlea atlas 1.08±0.13 turns of the cochlea was covered by this new electrode. 결론:A newly developed cochlear implant electrode was inserted into fresh- frozen human temporal bones. 31 to 32 contacts were successfully inserted in all cases without complications such as tip-fold over, kinking, or migration. MicroCT imaging revealed an average insertion length of 20.7 mm and an insertion angle covering 1.1 turns (388.1°) of the cochlea, demonstrating the feasibility and effectiveness of the new electrode design.