التفاصيل البيبلوغرافية
| العنوان: |
Validating intracochlear pressure measurements in cadaver ears as a method to predict the clinical efficiency of implantable middle ear hearing device actuators. |
| المؤلفون: |
Gamm, U. A.1, Grossöhmichen, M.2, Busch, S.2, Waldmann, B.1, Lenarz, T.2, Maier, H.1 |
| المصدر: |
Journal of Hearing Science. 2018, Vol. 8 Issue 2, p363-364. 2p. |
| مصطلحات موضوعية: |
*CONFERENCES & conventions, *COCHLEAR implants, *RESEARCH methodology, *MIDDLE ear |
| مصطلحات جغرافية: |
BELGIUM |
| مستخلص: |
Introduction: Laser Doppler Vibrometry (LDV) is the gold standard to characterize implantable middle ear hearing devices (IMEHD) in temporal bones. However, LDV is not suitable for all actuator coupling configurations. An alternative to characterize IMEHD efficiency is the measurement of intracochlear pressure difference (ICPD). Aim of this study was to compare actuator output levels calculated from ICPD and LDV and validate the output levels against clinical data for two different middle ear implants. Methods: ICPD was measured through 2 probes that were inserted into the cochlear. Two different types of IMEHD actuators were used; The T2 actuator from the Cochlear™ Carina™ System, coupled to the incus and the Cochlear™ Codacs™ actuator that stimulates the cochlear through a stapedotomy. Actuator output was measured from LDV and ICPD. Clinical data was measured from bone conduction thresholds and "direct thresholds" using the sound processor as a signal generator. Results : For the T2 actuator coupled to the incus, both LDV and ICP measurements matched well with clinical data; only LDV showed small deviations < 9 dB below 3 kHz and above 4 kHz. For the Codacs actuator, measurements correlated well with the clinical data below 600 Hz and above 4 kHz, but deviated up to 20 dB for the mid-frequency range. A hypothesis, that tissue growth in patients would seal the stapedotomy and create additional sound transmission paths was disproved through an additional set of temporal bone experiments where the stapedotomy and cavity around the actuator was filled with fibrin glue. Conclusion: In incus stimulation IMEHD actuator output levels calculated from ICPD were similar to output levels based on SFP vibration and matched clinical data which allows prediction of clinical performance of these types of middle ear actuators. For direct acoustic stimulation however, a discrepancy in the mid-frequency range was observed and requires further investigation. [ABSTRACT FROM AUTHOR] |
| قاعدة البيانات: |
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