Cochlear implants, also known as cochlear implants, electronic cochlear implants or electronic cochlear implants, can help restore or provide the sense of hearing to adults and children with severe or profound deafness. Essentially a special acoustic-electrical conversion electronic device, the cochlear implant consists of four components: implanted electrodes in the cochlea, a speech processor, a directional microphone and a transmission-reception device. To understand how deaf patients can regain their hearing with a cochlear implant, it is first necessary to know how the auditory response is generated in normal people. The normal hearing population collects sound through the outer ear. Sound waves travel through the outer ear canal to the eardrum; the sound energy causes the eardrum to vibrate; the vibrating energy travels through the middle ear to the inner ear causing movement of hair cells in the cochlea; the hair cells convert the movement energy into bioelectrical impulses, which are transmitted through the auditory nerve fibers to the auditory center to produce hearing. In patients with severe or very severe sensorineural deafness, hearing cannot be produced through the outer ear-middle ear-inner ear (hair cells)-auditory nerve-auditory center as described above. Instead, the cochlear implant bypasses the outer- middle- inner ear hair cells and converts the mechanical acoustic signal from the environment into an electrical signal, which is transmitted to the cochlea and directly stimulates the participating auditory nerve-hearing center to produce hearing. The principle of cochlear implantation is as follows: sound is received by a directional microphone and converted into an electrical signal, which is then transmitted to a speech processor that amplifies and filters the signal and transmits it from the transmitter to the receiver, where the resulting electrical impulses are sent to the corresponding electrodes, thereby stimulating the excitation of the auditory nerve fibers and transmitting sound information to the brain to produce hearing. The effect of cochlear implantation: 1. It can improve the patient’s ability to perceive environmental sounds and speech sounds, and can improve the ability of lip reading (reading mouth patterns). 2. Helps in speech rehabilitation. 3. Tinnitus can be partially or completely relieved in some patients.