The equality of volume displacements in the inner ear windows

Kringlebotn, Magne

doi:10.1121/1.413746

Cited by 55 publications

(40 citation statements)

References 7 publications

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“…Although A TM is also a multiplication factor, it is not over-determined because the TM is situated "between" the two points where pressure and velocity were measured. The decision to keep A FP fixed is corroborated by the finding that its anatomical value exhibits a standard deviation as low as 0.9 dB in pig (Kringlebotn, 1995), as well as in humans (Aibara et al, 2001). This third step was intended to further improve the fits to the measured frequency responses.…”

Section: Fitting Proceduresmentioning

confidence: 92%

Forward and reverse transfer functions of the middle ear based on pressure and velocity DPOAEs with implications for differential hearing diagnosis

2011

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Section: Fitting Proceduresmentioning

confidence: 92%

Forward and reverse transfer functions of the middle ear based on pressure and velocity DPOAEs with implications for differential hearing diagnosis

2011

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“…In the normal ear, sound stimulation of the tympanic membrane by air conduction results in the motion of the stapes footplate with a corresponding motion in the cochlear fluid. This motion of the stapes footplate is also reflected in a comparable motion of the RW membrane, at least for low frequencies where the fluid volume displacement at the oval window nearly equals that at the RW, but with an opposite phase [Kringlebotn, 1995;Stenfelt et al, 2004a]. Thus, the RW membrane motion can be used to assess the sound transfer function through the cochlea when the oval window (or stapes) is not usable [Stenfelt et al, 2004b].…”

Section: Rationale For Rw Stimulation By Ameimentioning

confidence: 99%

Round Window Membrane Implantation with an Active Middle Ear Implant: A Study of the Effects on the Performance of Round Window Exposure and Transducer Tip Diameter in Human Cadaveric Temporal Bones

Tringali

Koka²,

Devèze

et al. 2010

Audiol Neurotol

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Objectives: To assess the importance of 2 variables, transducer tip diameter and resection of the round window (RW) niche, affecting the optimization of the mechanical stimulation of the RW membrane with an active middle ear implant (AMEI). Materials and Methods: Ten temporal bones were prepared with combined atticotomy and facial recess approach to expose the RW. An AMEI stimulated the RW with 2 ball tip diameters (0.5 and 1.0 mm) before and after the resection of the bony rim of the RW niche. The RW drive performance, assessed by stapes velocities using laser Doppler velocimetry, was analyzed in 3 frequency ranges: low (0.25–1 kHz), medium (1–3 kHz) and high (3–8 kHz). Results: Driving the RW produced mean peak stapes velocities (H_EV) of 0.305 and 0.255 mm/s/V at 3.03 kHz, respectively, for the 1- and 0.5-mm tips, with the RW niche intact. Niche drilling increased the H_EV to 0.73 and 0.832 mm/s/V for the 1- and 0.5-mm tips, respectively. The tip diameter produced no difference in output at low and medium frequencies; however, the 0.5-mm tip was 5 and 6 dB better than the 1-mm tip at high frequencies before and after niche drilling, respectively. Drilling the niche significantly improved the output by 4 dB at high frequencies for the 1-mm tip, and by 6 and 10 dB in the medium- and high-frequency ranges for the 0.5-mm tip. Conclusion: The AMEI was able to successfully drive the RW membrane in cadaveric temporal bones using a classical facial recess approach. Stimulation of the RW membrane with an AMEI without drilling the niche is sufficient for successful hearing outputs. However, the resection of the bony rim of the RW niche significantly improved the RW stimulation at medium and higher frequencies. Drilling the niche enhances the exposure of the RW membrane and facilitates positioning the implant tip.

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“…However, the model enables computation of fluid flows at other parts in the cochlea, for example at the OW and RW. It has been shown that for AC stimulation, the fluid displaced at the OW equals that at the RW but with opposite phases (Kringlebotn, 1995;Stenfelt et al, 2004a). This was investigated in the current model where a sound pressure was added to the middle ear branch,…”

Section: Fluid Flow At the Oval And Round Windowsmentioning

confidence: 99%

Inner ear contribution to bone conduction hearing in the human

Stenfelt

2015

Hearing Research

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Bone conduction (BC) hearing relies on sound vibration transmission in the skull bone.Several clinical findings indicate that in the human, the skull vibration of the inner ear dominates the response for BC sound. Two phenomena transform the vibrations of the skull surrounding the inner ear to an excitation of the basilar membrane, (1) inertia of the inner ear fluid and (2) compression and expansion of the inner ear space. The relative importance of these two contributors were investigated using an impedance lumped element model. By dividing the motion of the inner ear boundary in common and differential motion it was found that the common motion dominated at frequencies below 7 kHz but above this frequency differential motion was greatest. When these motions were used to excite the model it was found that for the normal ear, the fluid inertia response was up to 20 dB greater than the compression response. This changed in the pathological ear where, for example, otosclerosis of the stapes depressed the fluid inertia response and improved the compression response so that inner ear compression dominated BC hearing at frequencies above 400 Hz.The model was also able to predict experimental and clinical findings of BC sensitivity in the literature, for example the so called Carhart notch in otosclerosis, increased BC sensitivity in superior semicircular canal dehiscence, and altered BC sensitivity following a vestibular fenestration and RW atresia.

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The equality of volume displacements in the inner ear windows

Cited by 55 publications

References 7 publications

Forward and reverse transfer functions of the middle ear based on pressure and velocity DPOAEs with implications for differential hearing diagnosis

Forward and reverse transfer functions of the middle ear based on pressure and velocity DPOAEs with implications for differential hearing diagnosis

Round Window Membrane Implantation with an Active Middle Ear Implant: A Study of the Effects on the Performance of Round Window Exposure and Transducer Tip Diameter in Human Cadaveric Temporal Bones

Inner ear contribution to bone conduction hearing in the human

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