International journal of audiology · 2025
Maximum stable gain and fitting range of percutaneously applied bone conduction devices.
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Dingemanse Gertjan, Toll Martijn
Аннотация
OBJECTIVE: to measure the maximum stable gain (MSG, the feedback limit) and its variability in users with two percutaneous power bone conduction devices (BCDs), to determine an MSG-based fitting range, and to measure the available aided dynamic range.
DESIGN: The MSG was determined with the BCD attached to a participant's head. The BCD output was measured on a skull simulator. A fitting range was derived using the speech intelligibility index.
STUDY SAMPLE: 42 adult BCD users.
RESULTS: The average and range of the MSG was 13.3 ± 3.2 dB for device 1 and 16.1 ± 5.90 dB for device 2. The fitting range is 35-40 dB HL for a good understanding of soft speech and 45-50 dB HL for moderate-to-sufficient understanding of speech at a normal level in at least 50% of the cases with this hearing loss. The output for common speech levels is not limited by the maximum force output, except at low frequencies.
CONCLUSIONS: For users of a percutaneous power BCD, the maximum applicable gain is limited by feedback and is smaller than the full-on gain. Consequently, BCDs enable sufficient speech intelligibility only for mild-to-moderate sensorineural hearing loss. The aided dynamic range is adequate for hearing thresholds within this fitting range.
DESIGN: The MSG was determined with the BCD attached to a participant's head. The BCD output was measured on a skull simulator. A fitting range was derived using the speech intelligibility index.
STUDY SAMPLE: 42 adult BCD users.
RESULTS: The average and range of the MSG was 13.3 ± 3.2 dB for device 1 and 16.1 ± 5.90 dB for device 2. The fitting range is 35-40 dB HL for a good understanding of soft speech and 45-50 dB HL for moderate-to-sufficient understanding of speech at a normal level in at least 50% of the cases with this hearing loss. The output for common speech levels is not limited by the maximum force output, except at low frequencies.
CONCLUSIONS: For users of a percutaneous power BCD, the maximum applicable gain is limited by feedback and is smaller than the full-on gain. Consequently, BCDs enable sufficient speech intelligibility only for mild-to-moderate sensorineural hearing loss. The aided dynamic range is adequate for hearing thresholds within this fitting range.