Challenging aspects of contemporary cochlear implant electrode array design

Challenging aspects of contemporary cochlear

implant electrode array design

Pavel Mistrík;Claude Jolly;Daniel Sieber;Ingeborg Hochmair;

【期刊名称】《世界耳鼻咽喉头颈外科杂志（英文）》 【年(卷),期】2017(000)004

【摘要】Objective:A design comparison of current perimodiolar and lateral wall electrode arrays of the cochlear implant (CI) is provided.The focus is on functional features such as acoustic frequency coverage and tonotopic mapping,battery consumption and dynamic range.A traumacity of their insertion is also evaluated.Methods:Review of up-to-date literature.Results:Perimodiolar electrode arrays are positioned in the basal turn of the cochlea near the modiolus.They are designed to initiate the action potential in the proximity to the neural soma located in spiral ganglion.On the other hand,lateral wall electrode arrays can be inserted deeper inside the cochlea,as they are located along the lateral wall and such insertion trajectory is less traumatic.This class of arrays targets primarily surviving neural peripheral processes.Due to their larger insertion depth,lateral wall arrays can deliver lower acoustic frequencies in manner better corresponding to cochlear tonotopicity.In fact,spiral ganglion sections containing auditory nerve fibres tuned to low acoustic frequencies are located deeper than 1 and half turn inside the cochlea.For this reason,a significant frequency mismatch might be