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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 

Comparative study of cochlear damage with three perimodiolar electrode designs.

OBJECTIVE: To describe intracochlear insertion trauma caused by three perimodiolar cochlear implant electrodes. STUDY DESIGN: Descriptive histological study of 15 human cadaver temporal bones. METHODS: Fifteen cadaver temporal bones underwent surface preparation and were implanted with one of the following perimodiolar electrode arrays: Combi 40+PM (MedEl Corporation), HiFocus II (Advanced Bionics Corporation), or Contour (Cochlear Corporation). A cryosectioning technique was used to study horizontal sections at 200 microm intervals with the electrode in place. Image-enhanced videofluoroscopy and computer-assisted morphometrics were used to assess the mechanism of insertion trauma and to determine electrode position within the modiolus. RESULTS: Histological examination revealed varying degrees of damage to the spiral ligament, basilar membrane, and osseous spiral lamina. Using a novel grading system for electrode trauma, there was no statistically significant difference among the three electrodes. A literature search of histological studies of a commonly used "standard" electrode showed damage equal to or greater than that seen in the current study. CONCLUSIONS: Insertion trauma caused by periomodiolar electrodes occurs to an acceptable degree. Refinement of electrodes based on mechanisms of trauma may be able to further reduce damage.[1]

References

  1. Comparative study of cochlear damage with three perimodiolar electrode designs. Eshraghi, A.A., Yang, N.W., Balkany, T.J. Laryngoscope (2003) [Pubmed]
 
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