The pattern and degree of capsular fibrous sheaths surrounding cochlear electrode arrays.

The pattern and degree of capsular fibrous sheaths surrounding cochlear electrode arrays.
Hear Res. 2017 Feb 16;:
Authors: Ishai R, Herrmann BS, Nadol JB, Quesnel AM
Abstract
An inflammatory tissue reaction around the electrode array of a cochlear implant (CI) is common, in particular at the electrode insertion region (cochleostomy) where mechanical trauma often occurs. However, the factors determining the amount and causes of fibrous reaction surrounding the stimulating electrode, especially medially near the perimodiolar location, are unclear. Temporal bone (TB) specimens from patients who had undergone cochlear implantation during life with either Advanced Bionics (AB) Clarion (TM) or HiRes90K(TM) (Sylmar, CA, USA) devices that have a half-band and a pre-curved electrode, or Cochlear (TM) Nucleus (Sydney, Australia) device that have a full-band and a straight electrode were evaluated. The thickness of the fibrous tissue surrounding the electrode array of both types of CI devices at both the lower (LB) and upper (UB) basal turns of the cochlea was quantified at three locations: the medial, inferior, and superior aspects of the sheath. Fracture of the osseous spiral lamina and/or marked displacement of the basilar membrane were interpreted as evidence of intracochlear trauma. In addition, post-operative word recognition scores, duration of implantation, and post-operative programming data were evaluated. Seven TBs from six patients ...

Source: Hearing Research - February 15, 2017 Category: Audiology Authors: Ishai R, Herrmann BS, Nadol JB, Quesnel AM Tags: Hear Res Source Type: research