Perforations of the tympanic membrane and their effects upon middle-ear transmission
Perforations of the tympanic membrane and their effects upon middle-ear transmission
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鼓膜穿孔及其对中耳传播的影响
DOI：
10.1007/bf00404153
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
J. Tonndorf
中科院分区：
文献类型：
--
作者：
F. McArdle;J. Tonndorf
这一系列实验涉及鼓膜穿孔导致低频灵敏度损失的基础。1.利用鼓膜和中耳腔模型进行了一系列实验。这些实验适用于面向空腔的振动膜的一般功能。它们被用来帮助制定动物实验的实验程序。2.当中耳腔处于正常未打开状态时，猫的穿孔损失随着频率低于约1,000 Hz而呈反比增加。损失函数的斜率为-10.2 dB/倍频程。3.表明这种分级低频损失是由声压通过穿孔部位的孔直接进入中耳腔引起的。为了支持这一结论，在空气传导音刺激期间，穿孔的存在已被证明会影响鼓膜前后的正常声压比。此外，事实证明，声音通过其外壁上的开口进入该空腔也会导致分级低频损失。4.还提供了与穿孔位置影响相关的数据。
This series of experiments concerns the basis for losses in low-frequency sensitivity accompanying a perforation in the tympanic membrane.1.A series of experiments with a model of the tympanic membrane and middleear cavity was performed. These experiments apply to the general function of a vibrating membrane facing a cavity. They were used as an aid in drawing up experimental procedures for the animal experiments.2.When the middle-ear cavity is in its normal unopened condition, then perforation losses for the cat are shown to increase inversely with frequency below about 1,000 Hz. The slope of the loss function is −10.2 dB per octave.3.It is suggested that this graded low-frequency loss is caused by direct admittance of sound pressures into the middle-ear cavity, through the aperture at the site of perforation. In support of this conclusion, the presence of a perforation has been shown to affect the normal ratio of sound pressures in front and in back of the tympanic membrane, during stimulation by air-conducted tones. In addition, it is demonstrated that admittance of sound to this cavity through an opening in its outer wall also causes a graded low-frequency loss.4.Data relevant to the effects of location of a perforation have also been presented.