An Optimal Partial Ossicular Prosthesis Should Connect Both to the Tympanic Membrane and Malleus: A Temporal Bone Study Using Laser Doppler Vibrometry

Niklasson, Anders; Gladiné, Kilian; Rönnblom, Anton; Unge, Magnus von; Dirckx, Joris J.J.; Tano, Krister

doi:10.1097/mao.0000000000001699

Cited by 7 publications

(10 citation statements)

References 14 publications

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“…Laser-Doppler vibrometry (LDV) is widely used in the assessment of auditory ossicles displacement. The method has been used in fundamental research on middle ear mechanics, 1 – 6 optimization of surgical procedures 2 , 7 – 15 such as intraoperative qualification for implantable middle ear hearing devices, 2 , 16 , 17 and intraoperative evaluation of hearing improvement during ossiculoplasty. 18 – 26 Vibrometric studies have also been conducted for potential applications in the clinical diagnosis of hearing loss.…”

Section: Introductionmentioning

confidence: 99%

Handheld laser-fiber vibrometry probe for assessing auditory ossicles displacement

et al. 2021

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Significance: Measurements of auditory ossicles displacement are commonly carried out by means of laser-Doppler vibrometry (LDV), which is considered to be a gold standard. The limitation of the LDV method, especially for in vivo measurements, is the necessity to expose an object in a straight line to a laser beam operating from a distance. An alternative to this approach is the use of a handheld laser-fiber vibrometry probe (HLFVP) with a curved tip.Aim: We evaluate the feasibility of an HLFVP with a curved tip for measuring sound-induced displacement of the auditory ossicles.Approach: A handheld vibrometer probe guiding the laser beam with a fiber-optic cable was used for displacement measurements of the incus body and the posterior crus of the stapes. Tonal stimuli at frequencies of 0.5, 1, 2, and 4 kHz were presented by means of an insert earphone positioned in the outer ear canal. The probe was fixed at the measurement site using a tripod or hand-held by one of the two surgeons. Results:The measurements were carried out on six fresh temporal bones. Multivariate analysis of variance showed statistically significant differences for stimulus frequency (F 3;143 ¼ 29.37, p < 0.001, and η 2 ¼ 0.35), bone (F 5;143 ¼ 4.61, p ¼ 0.001, and η 2 ¼ 0.01), and measurement site (F 1;143 ¼ 4.74, p ¼ 0.03, and η 2 ¼ 0.02) in the absence of statistically significant differences for the probe fixation method (F 2;143 ¼ 0.15, p ¼ 0.862, and η 2 ¼ 0.001). Standard deviations of the means were 6.9, 2.6, 1.9, and 0.6 nm∕Pa for frequency, bone, site, and fixation, respectively. Ear transfer functions were found to be consistent with literature data. Conclusions:The feasibility of applying HLFVP to measure the displacement of auditory ossicles has been confirmed. HLFVP offers the possibility of carrying out measurements at various angles; however, this needs to be standardized taking into account anatomical limitations and surgical convenience.

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Section: Introductionmentioning

confidence: 99%

Handheld laser-fiber vibrometry probe for assessing auditory ossicles displacement

et al. 2021

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“…For example, we show in Fig. 1 human stapes footplate response curves measured using LDV by Niklasson et al [8]. Fig.…”

Section: Introductionmentioning

confidence: 89%

“…Therefore, two resonances are present in the data. The first resonance around 1 kHz is that of the hinging motion of the middle ear ossicles [2,5,8], and the second resonance around 3 kHz is that of the ear canal [6,8,9]. Fig.…”

Section: Introductionmentioning

confidence: 96%

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Shape-preserving average frequency response curves using rational polynomials: A case study on human stapes vibration measurements

Livens

Dirckx²

2022

Physics in Medicine

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“…To demonstrate the new processing method, we used stapes vibration data obtained from human temporal bones in previous work (Niklasson, 2017). In these experiments, the stapes footplate velocity was measured from the medial side at the center of the footplate after removal of the inner ear, and sound stimulation was presented through the intact ear canal.…”

Section: Input Datamentioning

confidence: 99%

Average middle ear frequency response curves with preservation of curve morphology characteristics

Gladiné

Dirckx

2018

Hearing Research

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For the validation of modelling results or the comparison of middle ear interventions, such as prostheses placement, average responses of middle ear vibrations are needed. One such response is the amplitude and phase of the vibration of the stapes footplate as a function of frequency. Average responses and their standard deviation are commonly obtained by calculating the mean of a number of measured responses at each frequency. A typical middle ear magnitude response curve shows a number of distinct peaks, and the location of these peaks varies between ears. By simply taking an average along the magnitude or phase response axis, the typical fine structure of the response curve is flattened out, delivering an average curve which no longer has the typical morphology of an individual response curve. This paper introduces methods to avoid this problem by first aligning the typical curve features along the frequency axis prior to calculating the average along the magnitude or phase axis, resulting in average magnitude and phase curves which maintain the typical morphology of the curve obtained for an individual ear. In the method, landmark points on the response magnitude curves are defined and the frequencies at which these points occur are averaged. Next, these average frequencies are used to align the landmark points between curves, prior to averaging values along the magnitude or phase axes. Methods for semi-automatic and manual assignment of landmark points and curve alignment are presented. After alignment, the correspondence between the original landmark frequencies and aligned frequencies is obtained together with the warping function which maps each original magnitude curve to its aligned version. The phase curves are aligned using the warping functions determined from the corresponding magnitude curves. Finally, a method is proposed to compare the data set of an individual measurement or model result to an aligned average curve in terms of magnitude and frequency by applying the alignment procedure to the individual curve.

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An Optimal Partial Ossicular Prosthesis Should Connect Both to the Tympanic Membrane and Malleus: A Temporal Bone Study Using Laser Doppler Vibrometry

Abstract: The best sound transmission might be achieved by placing a PORP in contact with both the tympanic membrane and the handle of the malleus.

Cited by 7 publications

References 14 publications

Handheld laser-fiber vibrometry probe for assessing auditory ossicles displacement

Handheld laser-fiber vibrometry probe for assessing auditory ossicles displacement

Shape-preserving average frequency response curves using rational polynomials: A case study on human stapes vibration measurements

Average middle ear frequency response curves with preservation of curve morphology characteristics

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