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

Reinfeldt, Sabine,1978Chalmers tekniska högskola,Chalmers University of Technology (author)

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.

Östli, Per,1979Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)ostli (author)
Håkansson, Bo,1953Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)boh (author)
Taghavi, Hamidreza,1981Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)taghavi (author)
Eeg-Olofsson, Måns,1967Gothenburg University,Göteborgs universitet,Institutionen för kliniska vetenskaper, Avdelningen för öron-, näs- och halssjukdomar,Institute of Clinical Sciences, Department of Otorhinolaryngology,University of Gothenburg(Swepub:gu)xeegma (author)
Stalfors, Joacim,1966Gothenburg University,Göteborgs universitet,Institutionen för kliniska vetenskaper, Avdelningen för öron-, näs- och halssjukdomar,Institute of Clinical Sciences, Department of Otorhinolaryngology,University of Gothenburg(Swepub:gu)xstalj (author)
Chalmers tekniska högskolaInstitutionen för kliniska vetenskaper, Avdelningen för öron-, näs- och halssjukdomar (creator_code:org_t)

By the author/editor: Reinfeldt, Sabin ...; Östli, Per, 1979; Håkansson, Bo, 1 ...; Taghavi, Hamidre ...; Eeg-Olofsson, Må ...; Stalfors, Joacim ...

About the subject

MEDICAL AND HEALTH SCIENCES: MEDICAL AND HEAL ...; and Clinical Medicin ...; and Otorhinolaryngol ...

By the university: University of Gothenburg; Chalmers University of Technology

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