Long-term follow-up and review of the Bone Conduction Implant
Review article, 2022

Active transcutaneous bone conduction devices are a type of bone conduction device developed to keep the skin intact and provide direct bone conduction stimulation. The Bone Conduction Implant (BCI) is such a device and has been implanted in 16 patients. The objective of this paper is to give a broad overview of the BCI development to the final results of 13 patients at 5-year follow-up. Follow-up of these patients included audiological performance investigations, questionnaires, as well as safety evaluation and objective functionality testing of the device. Among those audiological measure-ments were sound field warble tone thresholds, speech recognition threshold (SRT), speech recognition score (SRS) and signal to noise ratio threshold (SNR-threshold).The accumulated implant time for all 16 patients was 113 years in February 2022. During this time, no serious adverse events have occurred. The functional improvement for the 13 patients reported in this paper was on average 29.5 dB (average over 0.5, 1, 2 and 4 kHz), while the corresponding effective gain was-12.4 dB. The SRT improvement was 24.5 dB and the SRS improvement was 38.1%, while the aided SNR-threshold was on average -6.4 dB.It was found that the BCI can give effective and safe hearing rehabilitation for patients with conduc-tive and mild-to-moderate mixed hearing loss.

Implanted transducer

Active transcutaneous

Bone conduction

Hearing rehabilitation

Bone conduction device

Bone conduction implant


Sabine Reinfeldt

Chalmers, Electrical Engineering, Signal Processing and Biomedical Engineering

Mans Eeg-Olofsson

University of Gothenburg

Karl-Johan Fredén Jansson

Chalmers, Electrical Engineering, Signal Processing and Biomedical Engineering

Ann -Charlotte Persson

University of Gothenburg

Bo Håkansson

Chalmers, Electrical Engineering, Signal Processing and Biomedical Engineering

Hearing Research

0378-5955 (ISSN) 18785891 (eISSN)

Vol. 421 108503

Subject Categories

Other Medical Sciences not elsewhere specified







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7/1/2022 5