Evaluation of the hybrid-L24 electrode using microcomputed tomography.

Area of Science:

• Otolaryngology
• Neurosurgery
• Biomedical Engineering

Background:

• Cochlear implantation is a key treatment for severe to profound hearing loss.
• Electrode array insertion techniques impact surgical outcomes and hearing preservation.
• The Cochlear Hybrid-L24 electrode array is designed for specific hearing loss profiles.

Purpose of the Study:

• To compare electrode array position and insertion depth of the Cochlear Hybrid-L24.
• To evaluate outcomes following traditional cochleostomy versus round window (RW) insertion.
• To assess intracochlear trauma associated with each insertion method.

Main Methods:

• Prospective cadaveric temporal bone study.
• Ten temporal bones implanted with Hybrid-L24 electrode array.
• Micro-CT scanning for analysis of electrode position, trauma, and insertion depth.

Main Results:

• Successful insertion via both RW and cochleostomy techniques with minimal resistance.
• No significant intracochlear trauma observed, including to the osseous spiral lamina or basilar membrane.
• RW insertions showed a more proximal perimodiolar orientation and less soft tissue contact compared to cochleostomy.

Conclusions:

• Hybrid-L24 electrode insertion is safe using either RW or cochleostomy techniques.
• Both methods result in minimal intracochlear trauma.
• RW insertion may offer advantages for hearing preservation compared to traditional cochleostomy.