The working principle of bone conduction hearing aid [bone conduction hearing aid]

Bone conduction hearing aidHow it works[Bone conduction hearing aid]

Deaf patients want to regain their hearing, they must use hearing aids, they must know about hearing aids before wearing hearing aids. Many friends have heard of a new type of hearing aids.–Bone conduction hearing aid, but forBone conduction hearing aidI don’t know very well. They don’t know who is suitable for bone conduction hearing aids. What is the working principle of the bone conduction hearing aid?

Hearing aids have both air conduction and bone conduction. Usually, sound waves are transmitted to the inner ear through air vibrations, causing the eardrum membrane to vibrate, which causes the inner and outer lymph fluids of the inner ear to vibrate. The auger completes the sensory process, the auditory nerve generates impulses, transmits to the auditory center, and “hears” through the cerebral cortex. Sound, that is to say the sound is generated from the vibration of the air, the sound heard is mainly caused by the vibration of the air. When the auditory organs are not perfect or certain organs of the auditory process become pathological or aging, it leads to deafness or hearing loss. At this time, hearing aids are needed to compensate for hearing.

The air conduction hearing aid is essentially a sound enhancer, that is, when the ambient sound intensity is insufficient to make the hearing loss sound, the sound is amplified by the hearing aid and then transmitted to the tympanic membrane. However, the gas-conducting hearing aid does not change the conduction path of the sound, and it is not suitable for some symptoms. For example, patients with ear canal atresia, perforation of eardrum, mechanical damage to small bones, inflammation of the ear canal, and blockage of ear canal secretions. Studies have shown that a significant proportion of older people use air-conducting hearing aids to feel “noisy” and unwilling to wear them.

It is worth noting that the current level of gas-conducting hearing aid technology is relatively high, especially after the adoption of digital processing technology, the ability of air-conducting hearing aids to process speech is greatly improved, and the gas-conducting hearing aid itself is not “noisy”, but rather Older people do not adapt to such hearing aids. The reason is that organ aging (such as tympanic membrane collapse) causes sound variability, that is, the sound that has been heard has changed, called auditory distortion. Old people with hearing distortion can not only hear the sound, but may lead to irritability and unsociable personality. This is the reason why the elderly often say “noisy” and are unwilling to use air conduction hearing aids in more noisy environments. The essential problem is that air conduction hearing aids are not suitable for the elderly.

The best way to solve this type of problem is to use a bone conduction hearing aid.

So-called bone transmissionBone conduction hearing aidIt is a hearing aid that senses sound based on the vibration of the skull. For example, I can hear my own teeth, and I hear my own speech belongs to the sound of the skull. Because the human skull is used to perceive the sound, the aging or lesion of the auditory organ generally does not affect the sound conduction, and the hearing aid effect is often better. The principle of the bone conduction hearing aid is basically the same as that of the gas conduction hearing aid. The microphone is used to pick up the ambient sound and the digital processor processes the speaker to work.

The bone conduction technology is based on the principle of vibration of the bones, and the communication mode of the sound transmission is realized by the human skull vibration as the propagation medium of the sound source body. The biggest difference from the traditional air-guided earphones is that when the bone conduction earphones are used to receive sound, it is not necessary to put them in the ear, just touch the bone conduction earphones close to the front side of the ears to hear the sound.

Then,Bone conduction hearing aidSuitable for what people use?

1.Since childhood, he is a deaf person, even if his hearing is55~70dBAnd older than8~12Most people who start using hearing aids at the age of the year will not get satisfactory results. Should be at the latest5,6Use a hearing aid before you get it.

2.If the binaural loss is consistent, the dynamic range is similar, and the binaural hearing aid is the best.

3.The difference in binaural hearing loss is greater than30dBApply one ear hearing aid for the side with high language discrimination and dynamic range.

4.One ear hearing loss is less than40dBAnd the other ear is60~70dBThe left and right should be used for the latter.

5.One ear hearing loss60~70dBThe hearing loss of the other ear is much larger than this value and should be used for the former.