Prostheses in the Ossicular Chain: I. Mechanics of Movement

Gundersen, Terje

doi:10.1001/archotol.1972.00770090648005

Cited by 17 publications

(8 citation statements)

References 5 publications

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“…Consequently, for frequencies above this 'middle ear resonance' the stapes moves in an outward direction when the umbo moves inward and vice versa. Similar findings have been reported by many authors [Dahmann, 1929;Fischler et al, 1967;Guinan and Peake, 1967;Tonndorf and Khanna, 1967;Gundersen, 1972;Kreutzer, 1978;Vlaming and Feenstra, 1986;Gyo et al, 1987;Kauf, 1997].…”

Section: Transfer Function Between Stapes Incus and Malleussupporting

confidence: 91%

Measurements of Ossicular Vibrations in the Middle Ear

Schön

Müller²

1999

Audiol Neurotol

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The vibrations of the ossicles were measured with a laser Doppler vibrometer in temporal bone specimens. The data contradicted the generally accepted view that the malleus and incus rotate about a fixed axis. The vibrations of the ossicles show a more complex pattern and, consequently, a more sophisticated model is needed to portray the behaviour of the middle ear in a satisfactory manner. But in turn models with many degrees of freedom make the identification process a very difficult task. This dilemma can be resolved if the system is divided into subsystems of less complexity where each subsystem can be studied in an appropriate manner. The excitation by electrostatic forces, as applied in this study, seems to be a powerful tool to make possible a study of parts of the ossicular chain.

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Section: Transfer Function Between Stapes Incus and Malleussupporting

confidence: 91%

Measurements of Ossicular Vibrations in the Middle Ear

Schön

Müller²

1999

Audiol Neurotol

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“…The combination of these results (Fig. 12) Gundersen (1971). Despite attempts to keep the specimens "fresh," the mean values of V• from these studies (Fig.…”

Section: Immittance At the Tympanic Membranementioning

confidence: 86%

Measurement of the acoustic input immittance of the human ear

Rabinowitz

1981

The Journal of the Acoustical Society of America

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A method is presented for measuring acoustic immittance (admittance or impedance) in the human ear canal and its validity is demonstrated for frequencies from 62 Hz to 4 kHz. Special attention is given to estimating the residual ear-canal space between the eardrum and the tip of the measuring device; estimates were determined, in part, using immittances measured with static pressures applied in the ear canal. Immittance estimates at the eardrum are reported for four normal subjects. Below 500 Hz, the immittance is compliance dominated. Our averaged compliance equivalent to 0.70 cc agrees with that reported by others. From 1 to 4 kHz, the immittance is resistance dominated. Our resistance values exceed those generally reported previously; they are, however, similar to those of Mehrgardt and Mellert [J. Acoust. Soc. Am. 61, 1567--1576 (1977)] and to values suggested from analysis of other acoustical measurements on the external ear.

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“…Because of the conical shape and the radial fibers in the eardrum, the sound is directed toward the umbo of the malleus. Gundersen (25) has shown that there is a difference between the acoustical driving force at the umbo and at the neck of the malleus. All these data align with our findings that umbo involvement in TMP worsens the hearing significantly with 5.5 dB on mean ABG, meaning that whenever the umbo is involved, 5.5 dB can be attributed to the loss of coupling, and the rest of the ABG is caused by the fact that there is a perforation in the eardrum.…”

Section: Frequency-dependent Hearing Loss In Tmpmentioning

confidence: 99%

Functional Correlations of Tympanic Membrane Perforation Size

Lerut

Pfammatter²,

Moons³

et al. 2012

Otology &Amp; Neurotology

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We propose using standardized photographs or drawings to document preoperative perforation sizes. A linear relationship between the size of a perforation and the conductive hearing loss does exist. Umbo involvement at the perforation margin may worsen the hearing by 5 to 6 dB, whereas the position of the perforation itself does not play a role. The least impact of a perforation is seen at the resonance frequency of 2 kHz. An "inverted V-shape" pattern, above and below 2 kHz, of the air-bone gap is a consistent finding. If the air-bone gap exceeds this pattern, additional pathology behind the eardrum perforation must be assumed and addressed.

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Prostheses in the Ossicular Chain: I. Mechanics of Movement

Cited by 17 publications

References 5 publications

Measurements of Ossicular Vibrations in the Middle Ear

Measurements of Ossicular Vibrations in the Middle Ear

Measurement of the acoustic input immittance of the human ear

Functional Correlations of Tympanic Membrane Perforation Size

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