Intraoperative Impedance Measurements for the Evaluation of Perimodiolar Location οf Cochlear Implant Electrode - Own Experience

• Authors: O. Stieler , M. Karlik , W. Szyfter
• Languages of publication: EN

Abstracts

EN

Evaluation of insertion of a cochlear implant electrode into the cochlea includes radiological techniques: plain X-ray of the skull, cochlear projection (based on Stenvers projection), computer tomography. These methods allow generally postoperative evaluation. During surgery the insertion of the electrode is assessed based on anatomical structures and markers placed on the electrode. The measurement of the electrode impedance is also an important tool. 60 patients implanted with the Contour cochlear implant with pre-shaped electrode were examined. Age o patients: mediana 4.25 (1.5-54.5). Examination includes intraoperative impedance measurement performed in two stages: (1) after the electrode insertion, and (2) after removal of the stylet. Measurements were done in Common Ground (CG) and Monopolar 1 (MP1) stimulation modes. Measurements recorded in two modes and in 3 different parts of the cochlea (apical, middle, basal) were compared. The average difference value (before-after) was for the CG mode: 0.45 kΩ, and for the MP1 mode: 0.39 kΩ. For the CG mode the difference values were: 0.64, 0.44 and 0.28 toward apical part. For the MP1 mode the difference values were: 0.47, 0.43 and 0.27 toward apical part of the cochlea.

Keywords

EN

43.90.+v; 43.58.-e; 43.60.-c; 43.60.+d

Discipline

• 43.90.+v: Other topics in acoustics (restricted to new topics in section 43)
• 43.60.+d: Acoustic signal processing

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2010
• Volume: 118
• Issue: 1
• Pages: 161-163

Dates

published

2010-07

Contributors

author

O. Stieler

• Institute of Acoustics, Adam Mickiewicz University, Poznań, Poland
• Department of Otolaryngology, Poznań University of Medical Sciences, Przybyszewskiego 49, 60-355 Poznań, Poland

author

M. Karlik

• Department of Phoniatrics and Audiology, Poznań University of Medical Sciences, Poznań, Poland

author

W. Szyfter

• Department of Otolaryngology, Poznań University of Medical Sciences, Przybyszewskiego 49, 60-355 Poznań, Poland

References

• 1. W. Szyfter, A. Pruszewicz, M. Karlik, M. Kawczyński, A. Sekula, P. Świdziński, M. Magierska, Eur. Arch. Oto-Rhino-Laryngol. 260, 460 (2003)
• 2. Nucleus Technical Reference Manual, Cochlear Corporation, Englewood, 1999
• 3. O. Stieler, Pol. J. Envir. Stud. 15, 103 (2006)
• 4. O. Stieler, M. Karlik, Arch. Acous. 30, 265 (2005)

Identifiers

DOI

10.12693/APhysPolA.118.161