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Fourth International Symposium and Workshops: Objective Measures in Cochlear Implants

Medical University of Hannover

01.06. bis 04.06.2005, Hannover

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A laboratory system for recording evoked action potentials (EAPs) with the Med-El PULSARci100 cochlea implant system

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  • corresponding author P. Spitzer - Institute of Applied Physics, University of Innsbruck , Austria
  • H. Schösser - Med-El Medical Electronics, Worldwide Headquarters, Innsbruck , Austria
  • C.M. Zierhofer - Institute of Applied Physics, University of Innsbruck, Austria
  • E.S. Hochmair - Institute of Applied Physics, University of Innsbruck , Austria

Medical University of Hannover, Department of Otolaryngology. Fourth International Symposium and Workshops: Objective Measures in Cochlear Implants. Hannover, 01.-04.06.2005. Düsseldorf, Köln: German Medical Science; 2005. Doc05omci089

The electronic version of this article is the complete one and can be found online at: http://www.egms.de/en/meetings/omci2005/05omci089.shtml

Published: May 31, 2005

© 2005 Spitzer et al.
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by-nc-nd/3.0/deed.en). You are free: to Share – to copy, distribute and transmit the work, provided the original author and source are credited.

Outline

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A PC-based laboratory system driving the PULSARci100 implant system is presented. The applied stimulation patterns can be adjusted in a flexible way (number of pulses, stimulation electrode address, pulse shape, pulse polarity, inter-pulse interval, recording electrode). The system is designed to read back the the recorded data from the implant, plot and analyze them. Optionally the data can exported them into MatlabR. The software supports common artefact cancellation methods. Special stimulation sequences and built-in safety features are implemented. In order to verify the systems linearity and sensitivity, an in vitro test system with a signal generator has been set up. It is shown that a signal amplitude range of approximately 60 dB can be covered. Intraoperative recordings as well as postoperative recordings have been carried out. So far it was possible to record EAPs in most of the subjects. EAP amplitudes from 20 µV to more than 1 mV could be observed. The system setup as well as first data will be presented.