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Percutaneous versus transcutaneous bone conduction implant system: a feasibility study on a cadaver head.

Journal article
Authors Bo Håkansson
Måns Eeg-Olofsson
Sabine Reinfeldt
Stefan Stenfelt
Gösta Granström
Published in Otology & neurotology : official publication of the American Otological Society, American Neurotology Society [and] European Academy of Otology and Neurotology
Volume 29
Issue 8
Pages 1132-9
ISSN 1537-4505
Publication year 2008
Published at Institute of Clinical Sciences
Pages 1132-9
Language en
Links dx.doi.org/10.1097/MAO.0b013e31816f...
Keywords Implantable bone conduction hearing aid
Subject categories Otoneurology

Abstract

OBJECTIVE: Percutaneous bone-anchored hearing aid (BAHA) is an important rehabilitation alternative for patients who have conductive or mixed hearing loss. However, these devices use a percutaneous and bone-anchored implant that has some drawbacks reported. A transcutaneous bone conduction implant system (BCI) is proposed as an alternative to the percutaneous system because it leaves the skin intact. The BCI transmits the signal to a permanently implanted transducer with an induction loop system through the intact skin. The aim of this study was to compare the electroacoustic performance of the BAHA Classic-300 with a full-scale BCI on a cadaver head in a sound field. The BCI comprised the audio processor of the vibrant sound bridge connected to a balanced vibration transducer (balanced electromagnetic separation transducer). METHODS: Implants with snap abutments were placed in the parietal bone (Classic-300) and 15-mm deep in the temporal bone (BCI). The vibration responses at the ipsilateral and contralateral cochlear promontories were measured with a laser Doppler vibrometer, with the beam aimed through the ear canal. RESULTS: Results show that the BCI produces approximately 5 dB higher maximum output level and has a slightly lower distortion than the Classic-300 at the ipsilateral promontorium at speech frequencies. At the contralateral promontorium, the maximum output level was considerably lower for the BCI than for the Classic-300 except in the 1-2 kHz range, where it was similar. CONCLUSION: Present results support the proposal that a BCI system can be a realistic alternative to a BAHA.

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