Comparison of Speech Recognition With an Organ of Corti Versus Spiral Ganglion Frequency-to-Place Function in Place-Based Mapping of Cochlear Implant and Electric-Acoustic Stimulation Devices

2021 ◽  
Vol Publish Ahead of Print ◽  
Author(s):  
Margaret T. Dillon ◽  
Michael W. Canfarotta ◽  
Emily Buss ◽  
Brendan P. O’Connell
Keyword(s):  
Speech Recognition ◽  
Cochlear Implant ◽  
Spiral Ganglion ◽  
Organ Of Corti ◽  
Acoustic Stimulation ◽  
Electric Acoustic Stimulation

scholarly journals Hearing Preservation in Cochlear Implant Surgery

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Priscila Carvalho Miranda ◽  
André Luiz Lopes Sampaio ◽  
Rafaela Aquino Fernandes Lopes ◽  
Alessandra Ramos Venosa ◽  
Carlos Augusto Costa Pires de Oliveira
Keyword(s):  
Cochlear Implant ◽  
Cochlear Implantation ◽  
Surgical Techniques ◽  
Low Frequency ◽  
Hearing Preservation ◽  
Acoustic Stimulation ◽  
Electrode Design ◽  
High Frequency Region ◽  
Electric Acoustic Stimulation ◽  
New Treatment

In the past, it was thought that hearing loss patients with residual low-frequency hearing would not be good candidates for cochlear implantation since insertion was expected to induce inner ear trauma. Recent advances in electrode design and surgical techniques have made the preservation of residual low-frequency hearing achievable and desirable. The importance of preserving residual low-frequency hearing cannot be underestimated in light of the added benefit of hearing in noisy atmospheres and in music quality. The concept of electrical and acoustic stimulation involves electrically stimulating the nonfunctional, high-frequency region of the cochlea with a cochlear implant and applying a hearing aid in the low-frequency range. The principle of preserving low-frequency hearing by a “soft surgery” cochlear implantation could also be useful to the population of children who might profit from regenerative hair cell therapy in the future. Main aspects of low-frequency hearing preservation surgery are discussed in this review: its brief history, electrode design, principles and advantages of electric-acoustic stimulation, surgical technique, and further implications of this new treatment possibility for hearing impaired patients.

Computer-Generated Three-Dimensional Reconstruction of the Cochlea

1989 ◽  
Vol 100 (2) ◽  
pp. 87-91 ◽  
Author(s):  
Laurence Ariyasu ◽  
Frank R. Galey ◽  
Raymond Hilsinger ◽  
Frederick M. Byl
Keyword(s):  
Cochlear Implant ◽  
Spiral Ganglion ◽  
Three Dimensional ◽  
Organ Of Corti ◽  
Nerve Fibers ◽  
Cochlear Nerve ◽  
Three Dimensional Reconstruction ◽  
Optimum Length ◽  
Dimensional Reconstruction ◽  
Cochlear Damage

Computer-generated three-dimensional reconstructions of the nerve fibers from the organ of Corti to the spiral ganglion were used to determine the optimum maximal length of the cochlear implant electrode. The spiral ganglion within the modiolus is much shorter than the organ of Corti. The spiral ganglion has turns and reaches no higher than the middle of the second turn of the organ of Corti, which has turns. The spiral ganglion is concentric and basal with respect to the organ of Corti. The spiral ganglion dendrites within the osseous spiral lamina of the basal turn project radially, nearly perpendicular to the central axis of the modiolus. Upon entering the modiolus, they turn basally at an angle of approximately 120 degrees. The projection of dendrites within the osseous spiral lamina became increasingly oblique as the ganglion extended apically. The organization of the cochlear nerve results from the spiraling of the ganglion. These findings are in agreement with previous reports. Implications of these findings and their possible relevance to the optimum length of the cochlear implant electrode are discussed with reference to cochlear damage resulting from longer electrodes.

Development and Evaluation of an Improved Cochlear Implant Electrode Design for Electric Acoustic Stimulation

2004 ◽  
Vol 114 (7) ◽  
pp. 1237-1241 ◽  
Author(s):  
Oliver Adunka ◽  
Jan Kiefer ◽  
Marc H. Unkelbach ◽  
Thomas Lehnert ◽  
Wolfgang Gstoettner
Keyword(s):  
Cochlear Implant ◽  
Acoustic Stimulation ◽  
Electrode Design ◽  
Electric Acoustic Stimulation
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