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Related Experiment Video

Updated: Jun 13, 2025

Performing Intracochlear Electrocochleography During Cochlear Implantation

Performing Intracochlear Electrocochleography During Cochlear Implantation

Published on: March 8, 2022

Assessing Array-Type Differences in Cochlear Implant Users Using the Panoramic ECAP Method.

Charlotte Garcia¹, Robert P Carlyon

¹Cambridge Hearing Group, Medical Research Council Cognition & Brain Sciences Unit, University of Cambridge, Cambridge, United Kingdom.

Ear and Hearing

|May 22, 2025

Summary

This summary is machine-generated.

Cochlear implant electrode array shape impacts current spread. Precurved arrays for Cochlear devices narrow current spread, especially at the cochlear apex, unlike straight arrays.

Keywords:

Array type Cochlear Implant Current Spread Electrode-modiolus distances Panoramic ECAP

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Last Updated: Jun 13, 2025

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Enhancing Electrode Location Assessment in Cochlear Implantation via Computed Tomography Image Fusion

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Published on: January 17, 2025

Area of Science:

Otoacoustic Emissions
Neurosurgery
Biomedical Engineering

Background:

Cochlear implant electrode arrays vary in geometry (straight vs. precurved).
Different array designs may influence electrode positioning and neural excitation patterns.
The panoramic electrically evoked compound action potential (PECAP) method assesses neural responsiveness and current spread.

Purpose of the Study:

To evaluate how cochlear implant electrode array type affects current spread and neural responsiveness.
To compare current spread patterns between straight and precurved arrays from different manufacturers.
To establish a normative dataset for identifying atypical patterns in cochlear implant users.

Main Methods:

Collected electrically evoked compound potentials (ECAPs) from 91 Cochlear and 53 Advanced Bionics device users.
Utilized the PECAP algorithm to estimate current spread and neural responsiveness along the electrode array.
Analyzed computed tomography scans for electrode-modiolus distances in a subset of participants.
Employed linear mixed-effects models to assess differences between array types and electrodes.

Main Results:

For Cochlear devices, array type significantly affected current spread (p=0.001), with precurved arrays showing narrower spread than straight arrays, particularly at the cochlear apex.
A significant correlation was found between PECAP's current-spread estimate and electrode-modiolus distance (r=0.516, p<0.001).
No significant effect of array type on current spread was observed for Advanced Bionics devices (p=0.979).

Conclusions:

Precurved electrode arrays in Cochlear devices result in narrower cochlear current spread compared to lateral-wall arrays, most notably at the apex.
These findings suggest potential implications for clinical device selection.
The study highlights the need for further research to establish causal links between device selection and specific neural excitation patterns.