Electrode array positioning after cochlear reimplantation from single manufacturer

Area of Science:

• Otolaryngology
• Neurosurgery
• Biomedical Engineering

Background:

• Cochlear implantation is a complex surgical procedure.
• Electrode array positioning is critical for device efficacy.
• Revision surgery may be necessary due to device complications or suboptimal outcomes.

Purpose of the Study:

• To evaluate changes in electrode positioning after revision cochlear implant surgery.
• To assess the impact of revision surgery on scalar location, modiolar distance, and angular insertion depth.
• To determine if using the same or a different electrode array style during revision affects positioning.

Main Methods:

• Retrospective analysis of a cochlear implant database.
• Intra-operative CT scans used for initial and revision implantations.
• Auto-segmentation techniques applied to calculate electrode array position.

Main Results:

• No significant change in modiolar distance or angular insertion depth after revision surgery.
• Three cases of electrode translocation from Scala Tympani to Scala Vestibuli occurred after initial implantation.
• Five additional translocations were observed after revision surgery, indicating a potential increased risk.

Conclusions:

• Revision cochlear implant surgery with the same device does not significantly alter key electrode positioning indicators.
• Revision surgery allows for potential correction of initial electrode misplacement.
• There is an increased risk of electrode translocation during revision surgery, irrespective of the electrode array style used.