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有时在阻抗测听和耳科检查都未查得传音性病变的人会有高频气-骨间距。这可能是在测骨导时,骨导振动器的经空气声放射所造成。早在本世纪30～40年代就已对这种可能性给予了注意,因而采用了橡胶、塑料等包住骨导振动器以消除声放射。近来听力计的骨导耳机在形状和大小方面都有改进,但对骨导振动器的经空气放射问题却未给予应有的重视。作者们介绍了Bell等对这一问题的研究,并报告他们对Radioear B-70A,B-71,和B-72型振动器在10名正常听力者堵耳和不堵耳时测试
Sometimes people who do not detect acoustic lesions in impedance audiometry and otology have high-frequency gas-bone space. This may be caused by airborne acoustic emissions from the bone-conduction vibrator during osteotomy. As early as in the 30s and 40s of this century has been paid attention to this possibility, so the use of rubber, plastic, etc. Guided bone conduction oscillator to eliminate acoustic emissions. Recently, the audiometer bone conduction earpiece has been improved in shape and size, but no attention has been given to the air conduction through the bone conduction vibrator. The authors present Bell et al.’s study of this issue and report their testing of the Radioear B-70A, B-71, and B-72 vibrators in the case of 10 normal hearing impaired and non-occluded ears