Minimizing Intracochlear Pressure: Influence of the Insertion Sheath

Area of Science:

• Otolaryngology
• Biomedical Engineering
• Surgical Innovation

Background:

• Minimizing trauma during cochlear implantation (CI) is a key surgical goal.
• Perimodiolar electrode arrays require insertion sheaths, which can affect intracochlear pressure.
• Optimizing insertion techniques is crucial for patient outcomes.

Purpose of the Study:

• To investigate modifications of the insertion sheath to reduce intracochlear pressure changes.
• To evaluate the impact of sheath design on pressure dynamics during electrode insertion.

Main Methods:

• Utilized an artificial cochlear model for testing.
• Assessed seven distinct modified insertion sheaths.
• Measured intracochlear pressure using a micro-optical sensor in the apical cochlear region.

Main Results:

• Shortening or tapering the apical portion of the insertion sheath significantly reduced intracochlear pressure.
• Modifications to the sheath's stopper also demonstrably influenced pressure levels.
• Observed a notable decrease in intracochlear pressure gain with modified sheaths.

Conclusions:

• Insertion sheath modifications can effectively lower intracochlear pressure.
• Subtle changes in electrode insertion techniques have a significant impact.
• Findings highlight the importance of sheath design in atraumatic CI procedures.