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Robotic Cochlear Implantation for Direct Cochlear Access
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In-Vitro Study of Speed and Alignment Angle in Cochlear Implant Electrode Array Insertions.

Philipp Aebischer, Georgios Mantokoudis, Stefan Weder

    IEEE Transactions on Bio-Medical Engineering
    |June 10, 2021
    PubMed
    Summary

    Optimizing cochlear implant electrode insertion with precise alignment parallel to the scala tympani centerline and non-constant speeds significantly reduces insertion forces and improves array movement, enhancing surgical outcomes.

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    Area of Science:

    • Biomedical Engineering
    • Otolaryngology
    • Surgical Robotics

    Background:

    • Electrode array insertion is a critical and challenging step in cochlear implantation surgery.
    • Optimizing insertion parameters is crucial for minimizing trauma and improving device performance.

    Purpose of the Study:

    • To investigate the effects of alignment angle and feed-forward speed on deep electrode array insertions.
    • To identify optimal parameters for smoother and safer cochlear implant insertion.

    Main Methods:

    • Performed 1033 motorized insertions in artificial scala tympani models with controlled properties.
    • Evaluated reaction forces and analyzed insertion micrographs.
    • Developed a mathematical model to estimate normal force distribution.

    Main Results:

    • Aligning insertions parallel to the cochlear base reduced insertion energies and improved array movement smoothness.
    • Non-constant insertion speeds decreased insertion forces compared to constant feed rates for the same total insertion time.

    Conclusions:

    • Cochlear implant insertion smoothness and peak forces are minimized by aligning the electrode array parallel to the scala tympani centerline.
    • Non-constant feed-forward speed profiles further enhance insertion safety and efficiency.