In-Vitro Study of Speed and Alignment Angle in Cochlear Implant Electrode Array Insertions

Aebischer, Philipp; Mantokoudis, Georgios; Weder, Stefan; Anschuetz, Lukas; Caversaccio, Marco; Wimmer, Wilhelm (2022). In-Vitro Study of Speed and Alignment Angle in Cochlear Implant Electrode Array Insertions. IEEE transactions on biomedical engineering, 69(1), pp. 129-137. Institute of Electrical and Electronics Engineers IEEE 10.1109/TBME.2021.3088232

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Objective: The insertion of the electrode array is a critical step in cochlear implantation. Herein we comprehensively investigate the impact of the alignment angle and feed-forward speed on deep insertions in artificial scala tympani models with accurate macro-anatomy and controlled frictional properties.

Methods: Motorized insertions (n=1033) were performed in six scala tympani models with varying speeds and alignment angles. We evaluated reaction forces and micrographs of the insertion process and developed a mathematical model to estimate the normal force distribution along the electrode arrays.

Results: Insertions parallel to the cochlear base significantly reduce insertion energies and lead to smoother array movement. Non-constant insertion speeds allow to reduce insertion forces for a fixed total insertion time compared to a constant feed rate.

Conclusion: In cochlear implantation, smoothness and peak forces can be reduced with alignment angles parallel to the scala tympani centerline and with non-constant feed-forward speed profiles.

Significance: Our results may help to provide clinical guidelines and improve surgical tools for manual and automated cochlear implantation.

Item Type:

Journal Article (Original Article)


04 Faculty of Medicine > Department of Head Organs and Neurology (DKNS) > Clinic of Ear, Nose and Throat Disorders (ENT)
10 Strategic Research Centers > ARTORG Center for Biomedical Engineering Research > ARTORG Center - Hearing Research Laboratory

Graduate School:

Graduate School for Cellular and Biomedical Sciences (GCB)

UniBE Contributor:

Aebischer, Philipp, Mantokoudis, Georgios, Weder, Stefan Andreas, Anschütz, Lukas Peter, Caversaccio, Marco, Wimmer, Wilhelm


600 Technology > 610 Medicine & health




Institute of Electrical and Electronics Engineers IEEE




Wilhelm Wimmer

Date Deposited:

28 Jun 2021 16:09

Last Modified:

02 Mar 2023 23:34

Publisher DOI:


PubMed ID:





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