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The effect of angulation of the vibrating floating mass transducer on stapes velocity. | LitMetric

The effect of angulation of the vibrating floating mass transducer on stapes velocity.

Otol Neurotol

*Department of Otolaryngology, Guy's and St. Thomas' Hospital, London; and †Centre for Biomimetics, School of Construction Management and Engineering, University of Reading, UK.

Published: August 2014

AI Article Synopsis

  • The study tests whether changing the angle of a vibrating floating mass transducer (FMT) attached to the incus affects the movement of the stapes in the middle ear.
  • Using seven human cadaveric temporal bones, researchers measured the stapes velocity while the FMT was positioned at either 0 degrees or 45 degrees.
  • Results showed that angling the FMT to 45 degrees reduced stapes velocity but did not significantly impact the implant's performance for hearing, especially in midfrequencies important for speech comprehension.

Article Abstract

Hypothesis: Changes to the angular position of the vibrating floating mass transducer (FMT) coupled to the long process of the incus will not affect stapes velocity.

Objective: The MED-EL Vibrant Soundbridge is an active middle ear implantable device, which constitutes an effective alternative to acoustic hearing aids for the rehabilitation of patients with sensorineural and mixed hearing loss. Because of varied anatomy, it is not always possible to position the FMT in line with the vibrating axis of the stapes. Changes in stapes velocity after angulation of the FMT are measured using laser Doppler vibrometry (LDV).

Methods: The study was performed on 7 human cadaveric temporal bones. The FMT was attached to the incus and angled at the recommended 0 degree or at 45 degrees relative to the vibrating axis of the stapes, and the stapes velocity measured using LDV.

Results: In comparison to the 0-degree position, angulating the FMT to 45 degrees reduced cochlea input as measured by stapes velocity, although there was no statistical significance to this difference. Placing the FMT at 45 degrees did not compromise the peak output of the device but resulted in a phase lag which was more marked compared with the 0-degree position.

Conclusion: If it is not anatomically possible to position the FMT in line with the vibrating axis of the stapes, then placement at up to 45 degrees does not significantly alter the performance of the implant particularly in the midfrequencies that are crucial to the understanding of speech.

Download full-text PDF

Source
http://dx.doi.org/10.1097/MAO.0000000000000303DOI Listing

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