The sound collected by the outside world needs to vibrate the skull to transmit the sound signal to the inner ear, that is to say, the hearing aid must be tightly attached to the skull to drive the skull to vibrate, otherwise it cannot be transmitted, or the transmission is incomplete or the noise is obvious, which is the hard injury of the bone conduction hearing aid.
The real application scope of bone conduction hearing aid; Children with microtia or other external ear deformities. Because children are too young to have plastic surgery, they can only have surgery when they are over 6 years old. Therefore, in the case that the hearing threshold of bone conduction is not serious, bone conduction hearing AIDS can be used first.
Repeated external and middle ear infections can not be improved after long-term treatment, and the bone conduction hearing threshold is not serious, so bone conduction hearing AIDS can be used. One-sided sensorineural hearing loss, who clearly knows the effect of bone conduction hearing AIDS.
Extended data;
The limitations of bone conduction hearing aid are: poor wearing comfort, bone conduction hearing aid is solid, and it must be close to the skull to transmit complete sound, which will inevitably cause pain to the bones;
It is not beautiful to wear, and the bone conduction hearing aid is not easy to fix. It must be fixed with hairpins, headbands, glasses and other headgear accessories, and even the bone conduction vibrator should be fixed directly on the skull with titanium nails.
The frequency range of hearing compensation is limited. The hearing range of normal people is between 20 Hz and 20HZ-20000hz, in which the voice signal is mainly concentrated between 250 Hz and 8,000 Hz, while the bone conduction hearing aid is far from enough to compensate the sound above 3000HZ.
Reference materials? Baidu encyclopedia-bone conduction hearing AIDS