A nonlinear finite-element model of the newborn middle ear

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Department of BioMedical Engineering, McGill University, Montréal, QC H3A 2B4, Canada ^{[1
]}

不详 ^{[2
]}

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]}

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Journal of the Acoustical Society of America | 2008年 / 124卷 / 01期

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A three-dimensional static nonlinear finite-element model of a 22-day-old newborn middle ear is presented. The model includes the tympanic membrane (TM); malleus; incus; and two ligaments. The effects of the middle-ear cavity are taken into account indirectly. The geometry is based on a computed-tomography scan and on the published literature; supplemented by histology. A nonlinear hyperelastic constitutive law is applied to model large deformations. The middle-ear cavity and the Young's modulus of the TM have significant effects on TM volume displacements. The TM volume displacement and its nonlinearity and asymmetry increase as the middle-ear cavity volume increases. The effects of the Young's moduli of the ligaments and ossicles are found to be small. The simulated TM volume changes do not reach a plateau when the pressure is varied to either -3 kPa or +3 kPa; which is consistent with the nonflat tails often found in tympanograms in newborns. The simulated TM volume displacements; by themselves and also together with previous ear-canal model results; are compared with equivalent-volume differences derived from tympanometric measurements in newborns. The results suggest that the canal-wall volume displacement makes a major contribution to the total canal volume change; and may be larger than the TM volume displacement. © 2008 Acoustical Society of America;

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页码：337 / 347

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