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Evaluation of insertion quality of a slim perimodiolar electrode array
R Beck1, A Aschendorff1, S Arndt1
1Faculty of Medicine, Department of Otorhinolaryngology, Medical Center - University of Freiburg, University of Freiburg, Freiburg, Germany.
Summary
The slim modiolar electrode array (SMA) has a low 2.7% dislocation rate in cochlear implant surgery. Intraoperative X-ray imaging is recommended to detect tip fold over and ensure proper electrode placement.
Area of Science:
- Otolaryngology
- Neurosurgery
- Biomedical Engineering
Background:
- Scalar position and dislocation rates are critical in cochlear implant (CI) surgery.
- Understanding the impact of cochlear morphology and electrode array design is essential for successful implantation.
Purpose of the Study:
- To evaluate the scalar position and dislocation rates of a new slim perimodiolar electrode array (SMA).
- To assess the influence of cochlear morphology on electrode array placement and identify specific dislocation points.
Main Methods:
- Retrospective analysis of 81 ears implanted with the SMA.
- Postoperative cone beam computed tomography (CBCT) for scalar location assessment.
- Evaluation of cochlear morphology, insertion depth, angle, and electrode array design.
Main Results:
- The SMA demonstrated a low scalar dislocation rate of 2.7%.
- Three cases of intraoperative tip fold over were detected (3.7%) and revised.
- Cochlear morphology did not significantly influence insertion depth or scalar position.
Conclusions:
- The slim design of the SMA contributes to a low dislocation rate.
- A learning curve exists for handling the SMA, emphasizing the need for intraoperative imaging (X-ray) and measurements.
- Specific points of dislocation were identified, related to electrode array design.
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