Atraumaticity study of 2 cochlear implant electrode arrays

Area of Science:

• Otolaryngology
• Neurosurgery
• Biomedical Engineering

Background:

• Atraumatic surgery and advanced electrode arrays are critical in modern otologic procedures.
• Preserving cochlear anatomy and function is paramount for successful outcomes.
• Morphological evaluation of surgical trauma is essential for refining techniques.

Purpose of the Study:

• To evaluate the atraumaticity of two electrode arrays (HiFocus 1J and HiFocus Helix) in human temporal bones.
• To compare surgical trauma based on morphologic and histologic parameters.
• To assess the safety of electrode array insertion in the cochlea.

Main Methods:

• Ten human temporal bones were divided into two groups for atraumatic insertion of HiFocus 1J and HiFocus Helix electrode arrays.
• Computed tomography and histologic analysis were used for morphologic and histologic evaluation.
• Insertion depth, angle, and location within the cochlea were meticulously analyzed.

Main Results:

• HiFocus 1J: Successful scala tympani insertion in 4/5 specimens with lateral array location.
• HiFocus Helix: Successful scala tympani insertion in 4/5 specimens with modiolar array location.
• Neither array demonstrated significant correlation between dimensions and insertion depth, indicating consistent placement.

Conclusions:

• Both HiFocus 1J and HiFocus Helix electrode arrays are safe for insertion.
• The study concludes that neither electrode array causes significant insertion trauma.
• These findings support the use of these electrode arrays in cochlear implantation surgeries.