Cochlear implantation via the middle fossa: surgical and electrode array considerations

• DOI: 10.1179/cim.2007.8.1.12
• Publication Date: 2014-01-09T17:35:52Z
• Authors: N. Wendell Todd
• Keywords: Geniculate ganglion; Middle cranial fossa; Electrode array; Cochlear Implantation

Cochlear implantation via the middle cranial fossa may access entire length of cochlea without opening ear. Concerns include safety and electrode array design. The objectives this study were to determine depth superior portion basal turn (SPBT) distances from facial greater petrosal nerves, describe some ideas about arrays. involved operative dissection 41 bequeathed otitis-free adult crania (82 temporal bones). Mastoid size was assessed by x-ray. Commercially available MED-EL split arrays inserted. floor SPBT ranged 0.5 mm 4.2 mm. Small mastoid correlated with shallow depth. Distances centre labyrinthine nerve, geniculate ganglion, nerve 1.0 3.0 mm, 2.0 3.2 1.8 2.8 respectively. More than 75% electrodes inserted toward round window extended into vestibule. Insertions cochlear apex had a median insertion 12 (range 6 18 mm). approach appears safe allows nearly full cochlea. Electrode specific for route are needed, together rigorous comparing outcomes traditional through recess. Copyright © 2007 John Wiley & Sons, Ltd.