Intracochlear Pressure Changes After Cochlea Implant Electrode Pullback-Reduction of Intracochlear Trauma

Area of Science:

• Otolaryngology
• Biomedical Engineering
• Neurosurgery

Background:

• Atraumatic insertion of cochlear implant electrode arrays is crucial for preserving residual hearing.
• Intracochlear pressure changes during insertion can impact hearing outcomes.
• The "pullback technique" aims to improve electrode positioning closer to the modiolus.

Purpose of the Study:

• To investigate the influence of the pullback technique on intracochlear pressure changes.
• To determine if electrode array moisture affects pressure during pullback.

Main Methods:

• Cochlear implant electrode insertions were simulated in an artificial cochlear model.
• Two different perimodiolar arrays were used.
• Intracochlear pressure was measured using a micro-optical sensor in the apical cochlear region.
• The pullback technique was applied after complete insertion.

Main Results:

• Statistically significant pressure differences were observed when the electrode array was moist during pullback.
• Electrodes with smaller total volumes exhibited lower relative pressure changes.
• The pullback technique resulted in small absolute intracochlear pressure changes.

Conclusions:

• Moistening the electrode array significantly reduces intracochlear pressure changes during the pullback maneuver.
• The pullback technique does not negatively impact residual hearing preservation.
• Utilizing the pullback technique may lead to enhanced postoperative audiological results, improving patient quality of life.