Effects of model definitions and parameter values in finite element modeling of human middle ear mechanics

Greef, DaniÃ«l De; Pires, Felipe; Dirckx, Joris J.J.

doi:10.1016/j.heares.2016.11.011

Cited by 44 publications

(31 citation statements)

References 38 publications

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“…It should be noted that our FE model is constructed only based on one human ear specimen. Based on a numerical study, Daniel et al [46] found that the human ear’s geometrical variation can lead to differences of 4 dB in the lower frequencies and up to 6 dB around 2 kHz, but similar shapes in the calculated response curves. Thus, the patients’ individual geometrical differences may alter our results quantitatively at lower frequencies and frequencies around 2 kHz.…”

Section: Discussionmentioning

confidence: 99%

The Influence of Piezoelectric Transducer Stimulating Sites on the Performance of Implantable Middle Ear Hearing Devices: A Numerical Analysis

et al. 2019

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To overcome the inherent deficiencies of hearing aids, implantable middle ear hearing devices (IMEHDs) have emerged as a new treatment for hearing loss. However, clinical results show that the IMEHD performance varies with its transducer’s stimulating site. To numerically analyze the influence of the piezoelectric transducer’s stimulating sites on its hearing compensation performance, we constructed a human ear finite element model and confirmed its validity. Based on this finite element model, the displacement stimulation, which simulates the piezoelectric transducer’s stimulation, was applied to the umbo, the incus long process, the incus body, the stapes, and the round window membrane, respectively. Then, the stimulating site’s effect of the piezoelectric transducer was analyzed by comparing the corresponding displacements of the basilar membrane. Besides, the stimulating site’s sensitivity to the direction of excitation was also studied. The result of the finite element analysis shows that stimulating the incus body is least efficient for the piezoelectric transducer. Meanwhile, stimulating the round window membrane or the stapes generates a higher basilar membrane displacement than stimulating the eardrum or the incus long process. However, the performance of these two ideal sites’ stimulation is sensitive to the changes in the excitation’s direction. Thus, the round window membrane and the stapes is the ideal stimulating sites for the piezoelectric transducer regarding the driving efficiency. The direction of the excitation should be guaranteed for these ideal sites.

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Section: Discussionmentioning

confidence: 99%

The Influence of Piezoelectric Transducer Stimulating Sites on the Performance of Implantable Middle Ear Hearing Devices: A Numerical Analysis

et al. 2019

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“…The pars tensa of the tympanic membrane is modeled by using an orthotropic elastic description with different radial and circumferential elastic moduli. The radial Young's modulus decreases away from the umbo, as explained in [44]. All other components are modeled as isotropic materials.…”

Section: Assessment In a Finite-element Modelmentioning

confidence: 99%

“…Finite-element model employed to assess the performances of the middle ear prostheses. Panel A depicts the healthy middle ear according to[44] while Panel B shows the adaptation of the model to our study, where a 5-mm TORP replaces the native middle ear components between the eardrum and oval window. Legend: PS: pars tensa, PF: pars flaccida, M: malleus, I: incus, S: stapes, IMJ: incudomalleolar joint, ISJ: incudostapedial joint, TMC: tympano-mallear connection; AML: anterior mallear ligament, LML: lateral mallear ligament, PIL: posterior incudal ligament, SAL: stapedial annular ligament, SFP: stapes footplate, TTT: tensor tympani tendon, SMT, stapedial muscle tendon.…”

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confidence: 99%

De novo topology optimization of total ossicular replacement prostheses

Milazzo

Muyshondt

Carstensen

et al. 2020

Journal of the Mechanical Behavior of Biomedical Materials

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Conductive hearing loss, due to middle ear pathologies or traumas, affects more than 5% of the population worldwide. Passive prostheses to replace the ossicular chain mainly rely on piston-like titanium and/or hydroxyapatite devices, which in the long term suffer from extrusion. Although the basic shape of such devices always consists of a base for contact with the eardrum and a stem to have mechanical connection with the residual bony structures, a plethora of topologies have been proposed, mainly to help surgical positioning. In this work, we optimize the topology of a total ossicular replacement prosthesis, by maximizing the global stiffness and under the smallest possible volume constraint that ensures material continuity. This investigation optimizes the prosthesis topology in response to static displacement loads with amplitudes that normally occur during sound stimulation in a frequency range between 100 Hz and 10 kHz. Following earlier studies, we discuss how the presence and arrangement of holes on the surface of the prosthesis plate in contact with the umbo affect the overall geometry. Finally, we validate the designs through a finite-element model, in which we assess the prosthesis performance upon dynamic sound pressure loads by considering four different constitutive materials: titanium, cortical bone, silk, and collagen/hydroxyapatite. The resultsshow that the selected prostheses present, almost independently of their constitutive material, a vibroacustic behavior close to that of the native ossicular chain, with a slight almost constant positive shift that reaches a maximum of ≈5 dB close to 1 kHz. This work represents a reference for the development of a new generation of middle ear prostheses with non-conventional topologies for fabrication via additive manufacturing technologies or ultraprecision machining in order to create patient-specific devices to recover from conductive hearing loss.

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“…All structures had the same Poisson's ratio and constant loss factor damping as a function of frequency, except for the columella having zero damping (e.g. De Greef et al, 2014bGreef et al, , 2017. The intracolumellar joint as defined in the current model requires a spring constant to describe its elastic properties instead of a Young's modulus and Poisson's ratio.…”

Section: Materials Propertiesmentioning

confidence: 99%

Quasi-static and dynamic motions of the columellar footplate in ostrich ( Struthio camelus ) measured ex vivo

et al. 2018

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Avian middle earmicro-CTlaser Doppler vibrometrydigital stroboscopic holographyfinite element modeling Highlights  Ostrich footplate motions were studied with micro-CT, LDV, holography & FE modeling  Mostly, quasi-static motions are piston-like, showing small rocking components  Dynamic motions are piston-like below 1 kHz and more complicated above this range  The inner-ear load raises rocking relative to piston-like motion at high frequencies

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Effects of model definitions and parameter values in finite element modeling of human middle ear mechanics

Cited by 44 publications

References 38 publications

The Influence of Piezoelectric Transducer Stimulating Sites on the Performance of Implantable Middle Ear Hearing Devices: A Numerical Analysis

The Influence of Piezoelectric Transducer Stimulating Sites on the Performance of Implantable Middle Ear Hearing Devices: A Numerical Analysis

De novo topology optimization of total ossicular replacement prostheses

Quasi-static and dynamic motions of the columellar footplate in ostrich ( Struthio camelus ) measured ex vivo

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