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Robustness and lifetime of the bone conduction implant – a pilot study

Authors Fredén Jansson KJ, Håkansson B, Rigato C, Eeg-Olofsson M, Reinfeldt S

Received 31 October 2018

Accepted for publication 7 January 2019

Published 26 February 2019 Volume 2019:12 Pages 89—100

DOI https://doi.org/10.2147/MDER.S192860

Checked for plagiarism Yes

Review by Single-blind

Peer reviewers approved by Ms Justinn Cochran

Peer reviewer comments 2

Editor who approved publication: Dr Scott Fraser


Karl-Johan Fredén Jansson,1 Bo Håkansson,1 Cristina Rigato,1 Måns Eeg-Olofsson,2 Sabine Reinfeldt1

1Department of Electrical Engineering, Chalmers University of Technology, Göteborg, Sweden; 2Department of Otorhinolaryngology, Head and Neck Surgery, Sahlgrenska University Hospital, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden

Objectives: The objective of this study was to develop methods for evaluating the mechanical robustness and estimating the lifetime of the novel bone conduction implant (BCI) that is used in a clinical study. The methods are intended to be applicable to any similar device.
Materials and methods: The robustness was evaluated using tests originally developed for cochlear implants comprising a random vibration test, a shock test, a pendulum test, and an impact test. Furthermore, magnetically induced torque and demagnetization during magnetic resonance imaging at 1.5 T were investigated using a dipole electromagnet. To estimate the lifetime of the implant, a long-term age-accelerated test was performed.
Results: Out of all the tests, the pendulum and the impact tests had the largest effect on the electro-acoustic performance of the BCI implant, even if the change in performance was within acceptable limits (<20%). In comparison with baseline data, the lower and higher resonance peaks shifted down in frequency by 13% and 18%, respectively, and with a loss in magnitude of 1.1 and 2.0 dB, respectively, in these tests.
Conclusion: A complete series of tests were developed, and the BCI passed all the tests; its lifetime was estimated to be at least 26 years for patients who are using the implant for 12 hours on a daily basis.

Keywords: audiology, bone conduction audiometry, electromagnetic transducer, electro-acoustics


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