Cochlear Implant Magnet
Cochlear implant is an implantable hearing aid device that provides a sense of sound to the person with severe to profound sensorineural hearing loss. Unlike the traditional deaf-aid, the working principle of cochlear implant is not amplify the sound, but apply electrical stimulation to the well-functioning auditory nerve in the cochlea.
How does auditory system work?
The human ear can be divided into the outerear, middle ear and inner ear.
The outer ear includes auricle and canal. The sound will further transmit through the canalafter collected and filtered by auricle.
The middle ear includes the tympanicmembrane and Ossicular chain. The tympanic membrane will vibrate in path with sound rhythm. The sound will translate to mechanical vibration in this process, and then the sound vibration will be entered the inner ear via Ossicular chain.
Inner ear includes the cochleaand auditory nerve. The sound vibration will lead to the movement of cochlear Hence cause the bends of hair cells. The neutral signal generated by hair cell will be picked up by the auditory nerve, and finally, the signal will be translated into sound by the brain.
The structure of cochlear implant
The cochlear implant system contains internal part and the external
The internal part includes receiver, decoder and stimulator. The internal part will be placed under the skin behind the ear by surgery.
The external partincludes microphone, speech processor and transmitter. The external part is always placed behind the ear.
The working principle of cochlear implant
The working of cochlear is based on the tonotopy of the cochlea. The hair cells of the deaf person are damaged or reduced due to different lesions, then residues cannot drive auditory nerve normally. For cochlear implant, the electrical stimulation will apply to the auditory nerve directly which skip to the sector of hair cells.
Microphone collect sound, and thenthe information spreads to the speech
Digitalization, filtering and coding by the speech
Digital signal spread to transmission coil through wire, then signal transmit to the receiver and stimulator under the skin.
Decoding by receiver and stimulator.
Electronic signal is passed to specifyposition of the electrode array, and hence stimulate the nerve fibers in the cochlea.
The electronic signal is recognized as sound by the brainafter nerve received the electronic
MRI compatible cochlear implant magnet
Magnetic Resonance Imaging (MRI) is a common medical imaging procedure nowadays, and detailed images of internal organs and tissue will be got relied on the powerful magnet of MRI.
For cochlear implant system, the processor magnet attracts to the internal part’s magnet to hold it in place. Therefore MRI becomes an extremely important issue for cochlear implant users. The significant risk of complications will be carried during MRI, such as pain, discomfort and magnet’s dislocation. In order to avoid the disadvantage influence of the powerful magnetic field (1.5T and 3.0T) to internal cochlear implant magnet, the cochlear implant manufacturers have introduced many solutions to solve MRI safety, includes head bandage and MRI Kit. In fact, how to make self-aligning implant magnet to avert surgery is still mainstream manufacturers. The special magnetization direction and isotropic NdFeB powder has been already used currently.
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