[Experimental research of middle ear implant]

Click and tone burst were used to evoke the auditory brainstem responses of experimental animals. The stimulations of different sound intensities were used. Amplitudes, latencies and thresholds of normal ear were measured and the incus of right ear was removed and Nd-Fe-B middle ear implanted. The thresholds of normal ears were 14.74 +/- 4.12 dB nHL on average. The thresholds of removed incus were 57.00 +/- 8.64 dB nHL on average. The thresholds of the implanted middle ears were 16.25 +/- 8.56 dB nHL. It was found that the characterstics of frequency responses of the implanted middle ear cover the whole area of language frequency in the experiment. It accorded with the features of audibility of human ear.