Long-Term Measures of Electrode Impedance and Auditory Thresholds for the Ineraid Cochlear Implant Measures of electrode impedance and of detection thresholds for electrical stimuli were extracted from the records of patients implanted with the Ineraid cochlear prosthesis. An analysis of impedance measures, obtained at 1, 12, 24, and 36 months after surgery, demonstrated (a) a significant decrease in impedance over the first year ... Research Article
Research Article  |   October 01, 1992
Long-Term Measures of Electrode Impedance and Auditory Thresholds for the Ineraid Cochlear Implant
 
Author Affiliations & Notes
  • Michael F. Dorman
    Arizona State University Tempe
  • Luke M. Smith
    Sinai Samaritan Medical Center Milwaukee, WI
  • Korine Dankowski
    Smith & Nephew Richards Memphis, TN
  • Geary McCandless
    University of Utah School of Medicine Salt Lake City
  • James L. Parkin
    University of Utah School of Medicine Salt Lake City
  • Contact author: Michael F. Dorman, PhD, Department of Speech and Hearing Science, Arizona State University, Tempe, AZ 85287-0102.
Article Information
Hearing & Speech Perception / Hearing Aids, Cochlear Implants & Assistive Technology / Hearing / Research Articles
Research Article   |   October 01, 1992
Long-Term Measures of Electrode Impedance and Auditory Thresholds for the Ineraid Cochlear Implant
Journal of Speech, Language, and Hearing Research, October 1992, Vol. 35, 1126-1130. doi:10.1044/jshr.3505.1126
History: Received May 9, 1991 , Accepted December 9, 1991
 
Journal of Speech, Language, and Hearing Research, October 1992, Vol. 35, 1126-1130. doi:10.1044/jshr.3505.1126
History: Received May 9, 1991; Accepted December 9, 1991

Measures of electrode impedance and of detection thresholds for electrical stimuli were extracted from the records of patients implanted with the Ineraid cochlear prosthesis. An analysis of impedance measures, obtained at 1, 12, 24, and 36 months after surgery, demonstrated (a) a significant decrease in impedance over the first year for electrodes that carried current and (b) significant increases in impedance at 24 and 36 months for electrodes that did not carry current. An analysis of detection thresholds, obtained at the same times as the impedance measures, demonstrated that averaged thresholds for the current-carrying electrodes varied no more than 0.5 dB over the 3-year period. These results support the conclusion that stimulation with the Ineraid device does not produce deleterious changes in the electrodes or in the target neural tissue.

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