Biomechanics of the tympanic membrane

Volandri, Gaia; Puccio, Francesca Di; Forte, Paola; Carmignani, Costantino

doi:10.1016/j.jbiomech.2010.12.023

Cited by 136 publications

(136 citation statements)

References 87 publications

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“…We used their average value (16 GPa) for the Young's moduli of all three ossicles. The very high value of 20 GPa reported in Table 3 of Volandri et al (2011) was a typographical error (GPa rather than MPa) in the original paper by Gentil et al (2005) (personal communication with Gentil). The very low value of 1.5 MPa used by Lesser and Williams (1988) was for a 2-D model.…”

Section: Baseline Materials Propertiesmentioning

confidence: 91%

Finite-Element Modelling of the Response of the Gerbil Middle Ear to Sound

Maftoon

Funnell

Daniel

et al. 2015

JARO

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We present a finite-element model of the gerbil middle ear that, using a set of baseline parameters based primarily on a priori estimates from the literature, generates responses that are comparable with responses we measured in vivo using multi-point vibrometry and with those measured by other groups. We investigated the similarity of numerous features (umbo, pars-flaccida and pars-tensa displacement magnitudes, the resonance frequency and break-up frequency, etc.) in the experimental responses with corresponding ones in the model responses, as opposed to simply computing frequency-by-frequency differences between experimental and model responses. The umbo response of the model is within the range of variability seen in the experimental data in terms of the low-frequency (i.e., well below the middle-ear resonance) magnitude and phase, the main resonance frequency and magnitude, and the roll-off slope and irregularities in the response above the resonance frequency, but is somewhat high for frequencies above the resonance frequency. At low frequencies, the ossicular axis of rotation of the model appears to correspond to the anatomical axis but the behaviour is more complex at high frequencies (i.e., above the pars-tensa break-up). The behaviour of the pars tensa in the model is similar to what is observed experimentally in terms of magnitudes, phases, the break-up frequency of the spatial vibration pattern, and the bandwidths of the high-frequency response features. A sensitivity analysis showed that the parameters that have the strongest effects on the model results are the Young's modulus, thickness and density of the pars tensa; the Young's modulus of the stapedial annular ligament; and the Young's modulus and density of the malleus. Displacements of the tympanic membrane and manubrium and the lowfrequency displacement of the stapes did not show large changes when the material properties of the incus, stapes, incudomallear joint, incudostapedial joint, and posterior incudal ligament were changed by ±10 % from their values in the baseline parameter set.

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Section: Baseline Materials Propertiesmentioning

confidence: 91%

Finite-Element Modelling of the Response of the Gerbil Middle Ear to Sound

Maftoon

Funnell

Daniel

et al. 2015

JARO

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“…Although there is a general consensus on the inhomogeneous mass distribution in different locations of the TM, full-field quantitative data remain absent, causing authors to employ simplified thickness distributions in their finite element (FE) models. A summary of such models was composed by Volandri et al (2011), who concluded that most authors adopt a single thickness value across the entire membrane, ranging between 30 and 150 μm. Wada et al (1992) were the first to include thickness data refinement in their FE models by specifying ten different thickness regions, corresponding with the measurements by Uebo et al (1988).…”

Section: Introductionmentioning

confidence: 99%

Full-Field Thickness Distribution of Human Tympanic Membrane Obtained with Optical Coherence Tomography

Jeught

Dirckx

Aerts

et al. 2013

JARO

123

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The full-field thickness distribution, three-dimensional surface model and general morphological data of six human tympanic membranes are presented. Crosssectional images were taken perpendicular through the membranes using a high-resolution optical coherence tomography setup. Five normal membranes and one membrane containing a pathological site are included in this study. The thickness varies strongly across each membrane, and a great deal of interspecimen variability can be seen in the measurement results, though all membranes show similar features in their respective relative thickness distributions. Mean thickness values across the pars tensa ranged between 79 and 97 μm; all membranes were thinnest in the central region between umbo and annular ring (50-70 μm), and thickness increased steeply over a small distance to approximately 100-120 μm when moving from the central region either towards the peripheral rim of the pars tensa or towards the manubrium. Furthermore, a local thickening was noticed in the antero-inferior quadrant of the membranes, and a strong linear correlation was observed between inferior-posterior length and mean thickness of the membrane. These features were combined into a single three-dimensional model to form an averaged representation of the human tympanic membrane. 3D reconstruction of the pathological tympanic membrane shows a structural atrophy with retraction pocket in the inferior portion of the pars tensa. The change of form at the pathological site of the membrane corresponds well with the decreased thickness values that can be measured there.

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“…(3) is skipped for the purpose of further analysis. This can be done since the expected magnitude of structural deflections for the middle ear prosthesis is small, as reported by Volandri et al [16] The wire radius is denoted by r and it is assumed that the ratio R/r is high enough so that the member curvature due to bending is not very pronounced with respect to its neutral state. Therefore the regular (straight beam) flexure formula may be used to compute the stresses distribution.…”

Section: Analytical Solutionmentioning

confidence: 99%

Static analysis of C-shape SMA middle ear prosthesis

Latalski

Rusinek

2017

Eur. Phys. J. Plus

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Abstract. Shape memory alloys are a family of metals with the ability to change specimen shape depending on their temperature. This unique property is useful in many areas of mechanical and biomechanical engineering. A new half-ring middle ear prosthesis design made of a shape memory alloy, that is undergoing initial clinical tests, is investigated in this research paper. The analytical model of the studied structure made of nonlinear constitutive material is solved to identify the temperature-dependent stiffness characteristics of the proposed design on the basis of the Crotti-Engesser theorem. The final integral expression for the element deflection is highly complex, thus the solution has to be computed numerically. The final results show the proposed shape memory C-shape element to behave linearly in the analysed range of loadings and temperatures. This is an important observation that significantly simplifies the analysis of the prototype structure and opens wide perspectives for further possible applications of shape memory alloys.

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Biomechanics of the tympanic membrane

Cited by 136 publications

References 87 publications

Finite-Element Modelling of the Response of the Gerbil Middle Ear to Sound

Finite-Element Modelling of the Response of the Gerbil Middle Ear to Sound

Full-Field Thickness Distribution of Human Tympanic Membrane Obtained with Optical Coherence Tomography

Static analysis of C-shape SMA middle ear prosthesis

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