What is the difference between a cochlear implant and a hearing aid?

As the name suggests, hearing aids amplify the sound and help the deaf patient hear the sound. It reaches the role of the amplifier. However, due to the severe hearing loss of some patients with severe or severe convulsions, the average hearing threshold of the speech frequency region often exceeds90Decibels, even the amplified sound is hard to hear, and the effect is still poor after wearing the hearing aid. This is because the inner ear sensory cells are damaged by inner ear disease, drug poisoning or other causes, which seriously hinders the transmission of auditory information. Although the externally amplified sound is natural and clear, the patient’s central auditory system cannot feel enough information.


The cochlear implant can receive the sound from the directional microphone, convert it into an electrical signal and transmit it to the speech processor, amplify and filter the sound, and transmit it to the receiver through the transmitter, and generate the generated electrical pulse to the corresponding electrode. Thereby causing the excitement of the nerve fibers, and then transmitting the sound information to the brain to produce hearing.

In short, the fundamental difference between cochlear implants and hearing aids is that the cochlear implant can bypass the damaged inner ear and directly stimulate the auditory nerve fibers, so that the patient can regain hearing, but the hearing aid can not.

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