[A registration system for evaluating acusto-mechanical transmission of middle ear implants].
A measurement system was developed that permits objective comparisons of the sound conduction of middle ear implants. The implants are fitted into a mechanical middle ear model which approximates the impedances of the eardrum and the inner ear. A defined signal within the frequency range of 0-5 kHz is provided by a miniaturized loudspeaker at the input to the model and is measured by a probe microphone. Displacement of an artificial stapes footplate at the output of the model is measured by a fiberoptic probe with a sensitivity of 5 nm. The transmission function is calculated as the quotient of the output and the input signal. This system can be used to evaluate the sound-transmitting properties of different middle ear implants excepting other influences, such as surgical techniques. This work details the measurement system and demonstrates basic influences on the sound-transmission of middle ear implants.
Meister
H
H
Universitäts-HNO-Klinik, Köln.
Stennert
E
E
Walger
M
M
Klünter
H D
HD
Mickenhagen
A
A
D000158:Acoustic Impedance Tests / Q000295:instrumentation*; D004432:Ear, Middle / Q000503:physiopathology*; D005336:Fiber Optic Technology / Q000295:instrumentation; D006314:Hearing Loss, Conductive / Q000503:physiopathology / Q000534:rehabilitation*; D006801:Humans; D008953:Models, Anatomic; D009998:Ossicular Prosthesis; D011474:Prosthesis Design; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation*; D013018:Sound Spectrography / Q000295:instrumentation