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Reported rates of revision cochlear implant surgery vary in adults and children from 3.8% to 8% with the most common indications being device failure, infection, and migration of the implant or electrode. [43] Disequilibrium and vertigo after CI surgery can occur but the symptoms tend to be mild and short-lived. [44]
The spiral (cochlear) ganglion is a group of neuron cell bodies in the modiolus, the conical central axis of the cochlea. These bipolar neurons innervate the hair cells of the organ of Corti . They project their axons to the ventral and dorsal cochlear nuclei as the cochlear nerve , a branch of the vestibulocochlear nerve (CN VIII).
The modiolus consists of spongy bone and the cochlea turns approximately 2.75 times around the central axis in humans. [1] The cochlear nerve, as well as spiral ganglion is situated inside it. The cochlear nerve conducts impulses from the receptors located within the cochlea. The picture shows the osseous labyrinth.
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The cell bodies of the cochlear nerve lie within the cochlea and collectively form the spiral ganglion, named for the spiral shape it shares with the cochlea. These central axons exit the cochlea at its base and form a nerve trunk , which, in humans, is approximately one inch long.
[20] [21] [22] Studies reporting on intercostal neurectomy often report cure rates (100% reduction in symptoms), even though it is not the primary success outcome. For example, patients may say they are cured or report pain scores of zero. There is a wide span of the reported cure rates, ranging from 22 - 67%.
The spiral canal of the cochlea is a section of the bony labyrinth of the inner ear that is approximately 30 mm long and makes 2 3 ⁄ 4 turns about the modiolus. The cochlear structures include: Three scalae or chambers: the vestibular duct or scala vestibuli (containing perilymph), which lies superior to the cochlear duct and abuts the oval ...
The Nucleus Profile implant, approved by the FDA in summer 2015, succeeded the Nucleus 24 implant. At the time it was released, it was the thinnest cochlear implant on the market. However, the titanium case on the Profile implant was 2.5 times stronger than the previous Nucleus 24 implant.