Measurements of Ossicular Vibrations in the Middle Ear

Schön, F.; Müller, J. M.

doi:10.1159/000013833

Cited by 11 publications

(5 citation statements)

References 14 publications

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“…This is agreement with the investigations of Schön and Müller (1999) where small forces were applied at the long processus of incus, while keeping the malleus and tympanic membrane fixed, analogous to our measurement setup.…”

Section: 32supporting

confidence: 91%

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Biomechanics of the incudo-malleolar-joint – Experimental investigations for quasi-static loads

et al. 2016

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Under large quasi-static loads, the incudo-malleolar joint (IMJ), connecting the malleus and the incus, is highly mobile. It can be classified as a mechanical filter decoupling large quasi-static motions while transferring small dynamic excitations. This is presumed to be due to the complex geometry of the joint inducing a spatial decoupling between the malleus and incus under large quasi-static loads. Spatial Laser Doppler Vibrometer (LDV) displacement measurements on isolated malleus-incus-complexes (MICs) were performed. With the malleus firmly attached to a probe holder, the incus was excited by applying quasi-static forces at different points. For each force application point the resulting displacement was measured subsequently at different points on the incus. The location of the force application point and the LDV measurement points were calculated in a post-processing step combining the position of the LDV points with geometric data of the MIC. The rigid body motion of the incus was then calculated from the multiple displacement measurements for each force application point. The contact regions of the articular surfaces for different load configurations were calculated by applying the reconstructed motion to the geometry model of the MIC and calculate the minimal distance of the articular surfaces. The reconstructed motion has a complex spatial characteristic and varies for different force application points. The motion changed with increasing load caused by the kinematic guidance of the articular surfaces of the joint. The IMJ permits a relative large rotation around the anterior-posterior axis through the joint when a force is applied at the lenticularis in lateral direction before impeding the motion. This is part of the decoupling of the malleus motion from the incus motion in case of large quasi-static loads. This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. AbstractUnder large quasi-static loads, the incudo-malleolar joint (IMJ), connecting the malleus and the incus, is highly mobile. It can be classified as a mechanical filter decoupling large quasi-static motions while transferring small dynamic excitations. This is presumed to be due to the complex geometry of the joint inducing a spatial decoupling between the malleus and incus under large quasi-static loads.Spatial Laser Doppler Vibrometer (LDV) displacement measurements on isolated malleus-incus-complexes (MICs) were performed. With the malleus firmly attached to a probe holder, the incus was excited by applying quasi-static forces at different points. For each force application point the resulting displacement was measured ...

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Section: 32supporting

confidence: 91%

“…Other studies have also reported a relative motion within the IMJ in case of quasi-static loads, e.g. Cancura (1980); Schön and Müller (1999).…”

Section: Introductionmentioning

confidence: 91%

Biomechanics of the incudo-malleolar-joint – Experimental investigations for quasi-static loads

et al. 2016

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“…It is possible to measure submicroscopic movements (in the nanometer range) of the tympanic membrane (TM) that occur when it is stimulated with sound. The LDI has been widely used in research to explore the function of the middle ear in animals, human cadaveric temporal bones (TB) 1–10 and, in some studies, even in live human subjects. 2,7,11 Its potential to diagnose otological diseases has been documented, because of its accuracy, reproducibility, high resolution of scanning, and the ability to obtain measurements without touching the object.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Eardrum Laser Doppler Interferometry as a Diagnostic Tool

et al. 2001

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“…This may be crucial given the importance of high frequencies in speech discrimination. Although controversial, there is also some evidence that there are frequency-dependent changes in the rotational axis of the malleusincus complex, (Schön & Müller, 1999). If confirmed, this would impair the ability of any middle ear microphone to produce a flat frequency response.…”

Section: Couplingmentioning

confidence: 99%

Implantable microphones as an alternative to external microphones for cochlear implants

Mitchell‐Innes

Morse

Irving

et al. 2017

Cochlear Implants International

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Totally implantable cochlear implants may be able to address many of the problems cochlear implant users have around cosmetic appearances, discomfort, and restriction of activities. The major technological challenges that need to be solved to develop a totally implantable device relate to implanted microphone performance. Previous attempts at implanting microphones for cochlear implants have not performed as well as conventional cochlear implant microphones, and in addition have struggled with extraneous body or surface contact noise. Microphones can be implanted under the skin or act as sensors in the middle ear; however, evidence from middle ear implants suggest body and contact noise can be overcome by converting ossicular chain movements into digital signals. This article reviews implantable microphone systems and discusses the technology behind them.

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Measurements of Ossicular Vibrations in the Middle Ear

Cited by 11 publications

References 14 publications

Biomechanics of the incudo-malleolar-joint – Experimental investigations for quasi-static loads

Biomechanics of the incudo-malleolar-joint – Experimental investigations for quasi-static loads

Evaluation of Eardrum Laser Doppler Interferometry as a Diagnostic Tool

Implantable microphones as an alternative to external microphones for cochlear implants

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