To the top

Page Manager: Webmaster
Last update: 9/11/2012 3:13 PM

Tell a friend about this page
Print version

Study of the Feasible Siz… - University of Gothenburg, Sweden Till startsida
To content Read more about how we use cookies on

Study of the Feasible Size of a Bone Conduction Implant Transducer in the Temporal Bone

Journal article
Authors Sabine Reinfeldt
Per Östli
Bo Håkansson
Hamidreza Taghavi
Måns Eeg-Olofsson
Joacim Stalfors
Published in Otology and Neurotology
Volume 36
Issue 4
Pages 631-637
ISSN 1531-7129
Publication year 2015
Published at Institute of Clinical Sciences, Department of Otorhinolaryngology
Pages 631-637
Language en
Keywords Bone conduction, implant, Computed tomography, Maximum size, Temporal bone, Transducer
Subject categories Otorhinolaryngology


Hypothesis: The aim was to assess the temporal bone volume to determine the suitable size and position of a bone conduction implant (BCI) transducer. Background: A BCI transducer needs to be sufficiently small to fit in the mastoid portion of the temporal bone for a majority of patients. The anatomical geometry limits both the dimension of an implanted transducer and its positions in the temporal bone to provide a safe and simple surgery. Methods: Computed tomography (CT) scans of temporal bones from 22 subjects were virtually reconstructed. With an algorithm in MATLAB, the maximum transducer diameter as function of the maximum transducer depth in the temporal bone, and the most suitable position were calculated in all subjects. Results: An implanted transducer diameter of 16 mm inserted at a depth of 4 mm statistically fitted 95% of the subjects. If changing the transducer diameter to 12 mm, a depth of 6 mm would fit in 95% of the subjects. The most suitable position was found to be around 20 mm behind the ear canal. Conclusion: The present BCI transducer casing, used in ongoing clinical trials, was designed from the results in this study, demonstrating that the present BCI transducer casing (largest diameter [diagonal]: 15.5 mm, height: 6.4 mm) will statistically fit more than 95% of the subjects. Hence, the present BCI transducer is concluded to be sufficiently small to fit most normal-sized temporal bones and should be placed approximately 20 mm behind the ear canal.

Page Manager: Webmaster|Last update: 9/11/2012

The University of Gothenburg uses cookies to provide you with the best possible user experience. By continuing on this website, you approve of our use of cookies.  What are cookies?