ANALYSIS OF DYNAMICAL CHARACTERISTICS OF MIDDLE EAR:MEASUREMENT WITH MIDDLE EAR ANALYSER

概要

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As the reliability of the conventional tympanometer is insufficient except for the diagnosis of the otitis media with effusion, an attempt is made to develop a new middle ear analyser, which will give us more detailed information. The acoustical and dynamical investigation makes it possible to develop a probe tip which shows the similar dynamical characteristics to the theoretical ones. This probe tip enables the middle ear analyser to measure the absolute variation of the sound pressure level and the phase of the human middle ear with sweep frequency.<BR>The dynamical characteristics of the normal middle ear were measured by this midle ear analyser. At the same time, by applying the combination of the impedance theory of the tube with the kinetic and strain energy theory, the equation of the middle ear corresponding to the output of the middle ear analyser was induced. In this paper, the emphasis was put upon the mechanism of the middle ear analyser and the results of the measurement. The theoretical analysis will be discussed in detail on another occasion.<BR>The results showed that the differences of the ear-drum and ossicular chain condition gave sensitive effect to the sound pressure level curves, although the audiograms of the subjects were nearly the same as the others. This middle ear analyser would have clinical applicability.
社団法人日本耳鼻咽喉科学会の論文