Download 13th International Conference on Cochlear Implants and Other

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The impact of a cochlear implant electrode array on middle ear transfer function - a temporal bone study
Pazen D. , Nünning M. , Anagiotos A. , Gostian A.-O. , Beutner D.
University Hospital Cologne, ENT Department, Köln, Germany
As a treatment for partial deafness with residual hearing in the lower frequency range the combined acoustic and
electric stimulation of the cochlea has become widely spread. The acoustic stimulation is provided by a hearing
aid's air-borne sound and the electric stimulation by a cochlea implant electrode array, which may inserted
through the round window or a cochleostomy. With regard to a most efficient acoustic stimulation of the cochlea
this study investigates the influence of an electrode array as well as its insertion path on middle ear sound
transmission. Furthermore the influence on inner ear fluid dynamics have been evaluated in 6 non fixated human
temporal bones. Therefore the stapes footplate and round window membrane movements were measured with
laser vibrometers in response to an acoustic stimulation at the tympanic membrane. The results show a small
trend towards an increase of the oval window net volume velocities with a present cochleostomy. The footplate
rotational component along the long axis increases independent of electrode array geometry and insertion path
while the volume velocity ratio of round and oval window remains unchanged within standard deviations of
measurements. The presence of an electrode array in the cochlea may change the middle ear sound
transmission properties and the perception of air-borne sound. These results may contribute to further
improvements in combined cochlear stimulation.