Ivarsson A
Ann Otol Rhinol Laryngol Suppl. 1980 May-Jun;89(3 Pt 2):207-10. doi: 10.1177/00034894800890s347.
The main principle of this new impedance method is a continuous recording of changes in tympanic membrane compliance in relation to its neutral position during changes in pressure, using a small pressure chamber. The subject sitting in the chamber can be placed in the recumbent position by rotation of the chamber. The working principles of the impedance method are: a servosystem regulates displacement of the loudspeaker membrane in order to keep the sound pressure in the external ear canal constant, independent of tympanic membrane compliance. From this recording it is possible to isolate tympanic membrane compliance during changes in intratympanic pressure as well as during ambient pressure changes. The results indicate that the new regulated impedance method combined with the small pressure chamber should be useful in routine clinical examination of middle ear mechanics and eustachian tube function.
这种新的阻抗方法的主要原理是，使用一个小型压力室，在压力变化过程中持续记录鼓膜顺应性相对于其中性位置的变化。坐在压力室内的受试者可通过旋转压力室被置于仰卧位。阻抗方法的工作原理是：一个伺服系统调节扬声器膜片的位移，以使外耳道内的声压保持恒定，而不受鼓膜顺应性的影响。通过该记录，可以分离出鼓室内压力变化以及环境压力变化期间的鼓膜顺应性。结果表明，结合小型压力室的新型调节阻抗方法在中耳力学和咽鼓管功能的常规临床检查中应会很有用。
