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The Bone Conduction ImplantFirst Implantation, Surgical and Audiologic Aspects

Eeg-Olofsson, Måns*; Håkansson, Bo; Reinfeldt, Sabine; Taghavi, Hamidreza; Lund, Henrik; Jansson, Karl-Johan Fredén; Håkansson, Emil; Stalfors, Joacim*

doi: 10.1097/MAO.0000000000000203
Basic Science

Objective: To report on preoperative assessment, surgery, and audiologic outcome of the first patient implanted with the bone conduction implant (BCI).

Background: The BCI is a bone conduction hearing device with an intact skin solution where the transducer is implanted close to the ear canal opening. By avoiding a percutaneous screw attachment to the skull, the BCI is anticipated to reduce complications associated with the Bone-Anchored Hearing Aid (BAHA) solution.

Methods: The first patient to receive a BCI was a 42-year-old woman with a unilateral mixed hearing loss due to tympanosclerosis. Preoperative and postoperative cone beam computed tomography and a virtual planning tool for 3D reconstruction were used to optimize and control the position of the BCI in the mastoid. The transducer was placed in a 5-mm deep seating in the mastoid and secured with a titanium bar. Free field tone and speech audiometry were conducted to evaluate the audiologic outcome at baseline (1 month postoperatively) and 1 month after baseline.

Results: The BCI was placed in the position according to the preoperative 3D planning. On average, the tone thresholds improved by 30 dB, speech reception thresholds by 25.5 dB and speech signal-to-noise ratio by 9.7 dB. The surgical procedure was considered simple and safe.

Conclusion: The BCI can be implanted by a safe and easy surgical procedure. 3D preoperative planning can be helpful to optimize the BCI position. The BCI is a realistic alternative to the BAHA.

*Department of Otorhinolaryngology, Head and Neck Surgery, Sahlgrenska University Hospital, Sahlgrenska Academy, University of Gothenburg; †Department of Signals and Systems, Chalmers University of Technology; and ‡Clinic of Oral and Maxillofacial Radiology, Department of Oral and Maxillofacial Radiology, Institute of Odontology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden

Address correspondence and reprint requests to Måns Eeg-Olofsson, M.D., Ph.D., ENT Department, Grona straket 5, Sahlgrenska University Hospital, S-413 45 Gothenburg, Sweden; E-mail: manseegolofsson@gmail.com

This study was supported by VINNOVA–Swedish Governmental Agency for Innovation Systems (Grant no. 2009-00190), Swedish Research Council, Hörselskadades riksförbund, Promobilia and “The Health & Medical Care Committee of the Regional Executive Board, Region Västra Götaland”.

The authors disclose no conflicts of interest.

Copyright © 2014 by Otology & Neurotology, Inc. Image copyright © 2010 Wolters Kluwer Health/Anatomical Chart Company