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BC811 - a new bone conduction instrument that requires no surgery
Giere T. , Busch S. , Lenarz T. , Maier H.
Medizinische Hochschule Hannover, HNO, Hannover, Germany, 2Medizinische Hochschule Hannover, ENT, Hannover, Germany
Introduction: Patients with conductive hearing loss or mixed hearing loss may benefit from bone conduction
hearing aids. These are usually either mounted on eyeglasses or implanted surgically. The new „Concha
Anchored Instrument“(CAI) BC811 is a bone conductive hearing aid that requires no surgery or eyeglasses. It is
mounted on an otoplastic inside the concha of the ear, transmiting the sound via the jaw bone to the skull and
into the inner ear. In our study we have tested the performance of the BC811 and compared it with conventional
bone-anchored instruments.
Method: Four subjects participated in the study. Initial audiometric procedure before the testing period
comprises tone and speech audiometry with headphones. Afterwards, the fitting of the own device was optimized
and audiological outcome was measured. Then the patients were fitted with the new BC811 which they tested for
a period of two weeks in every-day situations. The evaluation of both devices was done in unaided condition
containing speech perception in quiet (Freiburg Monosyllable test) / noise, (OlSa) as well as aided / unaided
thresholds. Subjective benefit was measured using the APHAB questionnaire.
Results: In sound field the patients got an average aided hearing threshold of ~29 dB HL (PTA, 0.5 - 4 kHz) with
the BC811. With their own bone anchored device they got an average threshold around 32 dB HL (PTA, 0.5 - 4
kHz). The speech perception at 65 dB SPL with the BC811 was 91% WRS with the BC811 and with their own
device 90% WRS. With a speech in noise test (OLSA), the patients achieved a mean SNR value of -1.9 dB with
the BC811 and a mean SNR of -3.3 dB with their own device.
Conclusion: The BC 811 can be seen as an alternative to bone anchored hearing aids since it does not require
any surgical intervention.