A surgical approach for a cochlear implant: an anatomical study

Area of Science:

• Otolaryngology
• Neurosurgery
• Auditory Neuroscience

Background:

• Understanding the anatomical relationship between the cochlea and medial tympanum structures is crucial for auditory nerve access.
• Previous surgical techniques may not provide optimal access to all cochlear turns for electrode implantation.

Purpose of the Study:

• To demonstrate the anatomical feasibility of surgical access to the terminal auditory nerve fibers supplying the basal, middle, and apical turns of the cochlea.
• To propose a novel, two-stage surgical approach for cochlear implantation.

Main Methods:

• Detailed anatomical study of the cochlea and medial tympanum.
• Surgical simulation and planning for electrode array insertion into specific cochlear turns.

Main Results:

• Demonstrated clear anatomical relationships between the cochlea and medial tympanum.
• Confirmed surgical accessibility to auditory nerve fibers across all cochlear turns (basal, middle, apical).

Conclusions:

• A two-stage cochlear implantation strategy is proposed, beginning with modified radical mastoidectomy.
• The second stage involves implanting electrode arrays into the three cochlear turns via precisely created openings in the basal and middle turns.