[Response property of tone burst transmission of partially implantable middle ear implant in vivo].
OBJECTIVE
To investigate the characteristics of tone burst transmission of the middle ear implant(MEI).


METHODS
Ten adult rabbits with normal hearing were used. A silver ball electrode was placed at the round window membrane to measure cochlear microphonics (CM) when sounds were presented before and after the implantation of the MEI. The tone burst was the acoustic stimulus.


RESULTS
Frequency response functions without and with the MEI in rabbit model were calculated, and their amplitude-frequency curves ranging from 0.5 to 6 kHz resembled each other in shape with gain factors about 15 dB at the frequencies above 1 kHz.


CONCLUSIONS
The results of this study indicated that the frequency response of the device fitted the speech transmission and it had high fidelity with little noise.
Zhao
S
S
Department of Otorhinolaryngology Head and Neck Surgery, Affiliated Beijing Tongren Hospital, Capital University of Medical Sciences, Beijing 100730, China. zhao_sq@yahoo.com.cn
Xia
Y
Y
Guo
J
J
Shen
J
J
D000818:Animals; D001301:Audiometry, Pure-Tone; D003055:Cochlear Microphonic Potentials / Q000502:physiology*; D004432:Ear, Middle / Q000601:surgery*; D005260:Female; D006310:Hearing Aids; D008297:Male; D019736:Prostheses and Implants; D011817:Rabbits