Holographic Vibration Analysis of the Ossicular Chain

Gundersen, Terje; Høgmoen, Kåre

doi:10.3109/00016487609120858

Cited by 49 publications

(22 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The incudomallear joint was not modeled in this study because it has been observed to be rigid at low frequencies (e.g., Guinan and Peake 1967;Gundersen 1976). With respect to the incudostapedial joint, Guinan and Peake (1967) and Decraemer and Khanna (2000) reported relative motion between the incus and stapes, but Funnell et al (2005) concluded that this may be attributable mostly to the pedicle, rather than to the incudostapedial joint-a conclusion that was confirmed by Robles et al (2006) in the chinchilla.…”

Section: Geometry and Materials Propertiesmentioning

confidence: 64%

“…For a given amount of surface detail, the representation as hollow shells greatly reduces the number of degrees of freedom in the finite-element solution by avoiding internal nodes. This is acceptable because the ossicles are assumed to behave like rigid structures, at least at low frequencies (Guinan and Peake 1967;Gundersen 1976), and because the mass distribution does not matter at frequencies low enough that inertial effects are negligible. The ossicles were represented with 4717 triangular shell elements.…”

Section: Geometry and Materials Propertiesmentioning

confidence: 99%

See 1 more Smart Citation

Low-Frequency Finite-Element Modeling of the Gerbil Middle Ear

Elkhouri

Liu

Funnell

2006

JARO

View full text Add to dashboard Cite

The gerbil is a popular species for experimental middle-ear research. The goal of this study is to develop a 3D finite-element model to quantify the mechanics of the gerbil middle ear at low frequencies (up to about 1 kHz). The 3D reconstruction is based on a magnetic resonance imaging dataset with a voxel size of about 45 mm, and an x-ray micro-CT dataset with a voxel size of about 5.5 mm, supplemented by histological images. The eardrum model is based on moiré shape measurements. Each individual structure in the model was assumed to be homogeneous with isotropic, linear, and elastic material properties derived from a priori estimates in the literature. The behavior of the finite-element model in response to a uniform acoustic pressure on the eardrum of 1 Pa is analyzed. Sensitivity tests are done to evaluate the significance of the various parameters in the finiteelement model. The Young_s modulus and the thickness of the pars tensa have the most significant effect on the load transfer between the eardrum and the ossicles and, along with the Young_s modulus of the pedicle and stapedial annular ligament, on the displacements of the stapes. Overall, the model demonstrates good agreement with low-frequency experimental data. For example, (1) the maximum footplate displacement is about 35 nm; (2) the umbo/stapes displacement ratio is found to be about 3.5; (3) the motion of the stapes is predominantly piston-like; and (4) the displacement pattern of the eardrum shows two points of maximum displacement, one in the posterior region and one in the anterior region. The effects of removing or stiffening the ligaments are comparable to those observed experimentally.

show abstract

Section: Geometry and Materials Propertiesmentioning

confidence: 64%

Section: Geometry and Materials Propertiesmentioning

confidence: 99%

Low-Frequency Finite-Element Modeling of the Gerbil Middle Ear

Elkhouri

Liu

Funnell

2006

JARO

View full text Add to dashboard Cite

show abstract

“…below 2 kHz), the stapes moves mainly in a Bpiston-like^or translational manner (e.g. Gundersen and Høgmoen 1976;Hato et al 2003;Decraemer and Khanna 2004). Thus, although the stapedial annular ligament constrains the stapes motion in three directions, at low frequencies, the effective load is parallel to the translational motion of the stapes.…”

Section: Materials Propertiesmentioning

confidence: 99%

Finite-Element Modelling of the Acoustic Input Admittance of the Newborn Ear Canal and Middle Ear

Motallebzadeh

Maftoon

Pitaro

et al. 2016

JARO

View full text Add to dashboard Cite

Admittance measurement is a promising tool for evaluating the status of the middle ear in newborns. However, the newborn ear is anatomically very different from the adult one, and the acoustic input admittance is different than in adults. To aid in understanding the differences, a finite-element model of the newborn ear canal and middle ear was developed and its behaviour was studied for frequencies up to 2000 Hz. Material properties were taken from previous measurements and estimates. The simulation results were within the range of clinical admittance measurements made in newborns. Sensitivity analyses of the material properties show that in the canal model, the maximum admittance and the frequency at which that maximum admittance occurs are affected mainly by the stiffness parameter; in the middle-ear model, the damping is as important as the stiffness in influencing the maximum admittance magnitude but its effect on the corresponding frequency is negligible. Scaling up the geometries increases the admittance magnitude and shifts the resonances to lower frequencies. The results suggest that admittance measurements can provide more information about the condition of the middle ear when made at multiple frequencies around its resonance.

show abstract

“…117 However, it is currently unclear what effect the tensor tympani actually has on ossicular movement; while some have suggested that contraction of this muscle tightens the ossicular joints among mammals in general, 44 others have found that traction applied to the tensor in humans appears to decouple malleus from incus. 83 The effects of stapedius contraction are better understood. In both cats and humans, this results in a sliding motion of the incudo-stapedial joint, such that the stapes head moves caudally relative to the lenticular apophysis.…”

Section: Flexibility and Pressure-bufferingmentioning

confidence: 99%

“…Such pressures include 'non-physiological' sound pressures 83 and the results of physical probing. 84 Hüttenbrink 85 found that static air pressures of up to ±400 mmH 2 O in the external ear canal resulted in a gliding movement at both inter-ossicular joints, the result of which was a reduction of stapes displacement relative to the displacement of the tympanic membrane.…”

Section: Mammalian Middle Earsmentioning

confidence: 99%

Flexibility within the middle ears of vertebrates

Mason

Farr

2012

J. Laryngol. Otol.

View full text Add to dashboard Cite

Introduction and aims: Tympanic middle ears have evolved multiple times independently among vertebrates, and share common features. We review flexibility within tympanic middle ears and consider its physiological and clinical implications.Comparative anatomy: The chain of conducting elements is flexible: even the 'single ossicle' ears of most nonmammalian tetrapods are functionally 'double ossicle' ears due to mobile articulations between the stapes and extrastapes; there may also be bending within individual elements.Simple models: Simple models suggest that flexibility will generally reduce the transmission of sound energy through the middle ear, although in certain theoretical situations flexibility within or between conducting elements might improve transmission. The most obvious role of middle-ear flexibility is to protect the inner ear from high-amplitude displacements.Clinical implications: Inter-ossicular joint dysfunction is associated with a number of pathologies in humans. We examine attempts to improve prosthesis design by incorporating flexible components.

show abstract

Holographic Vibration Analysis of the Ossicular Chain

Cited by 49 publications

References 6 publications

Low-Frequency Finite-Element Modeling of the Gerbil Middle Ear

Low-Frequency Finite-Element Modeling of the Gerbil Middle Ear

Finite-Element Modelling of the Acoustic Input Admittance of the Newborn Ear Canal and Middle Ear

Flexibility within the middle ears of vertebrates

Contact Info

Product

Resources

About