It is an electronic device placed under the skin by the doctors which carriessound, bypassing the damaged parts of the ear, to stimulate hearing nerve, whichin turn carry those signals to brain for understanding.
Parts of Cochlear Implants:
A microphone, which picks up sound from the environment.
A speech processor, which selects and arranges sounds picked up by themicrophone.
A transmitter and receiver/stimulator, which receive signals from thespeech processor and convert them into electric impulses.
An electrode array, which is a group of electrodes that collects theimpulses from the stimulator and sends them to different regions of theauditory nerve.
How does a cochlear implant work?
The external components capture environmental sounds as well as speech andmusic.
They process these sound so they can be transmitted across the skin to theimplant. The implant then passes the signals along to the electrode array.
The individual electrode then delivery these signals to the hearing nervewhere they travel.
Anyone who are suffering with severe to profound deafness, which means unable tohear sound stronger than 90 dB HL at a frequency of 2 – 4 kHz (a measuring unitof Intensity of sound). However, apart from assessing functional hearing abilitya thorough assessment will be done by a multi-disciplinary team before surgeryfor the factors such as fitness for surgery and the ability of the person toderive benefit from cochlear implant system.
Individuals 18 years of age or older.
Moderate to profound hearing loss in both ears.
Limited benefit from amplification defined by preoperative test scores of ≤50% sentence recognition in the ear to be implanted and ≤60% in the oppositeear or binaural.
Severe to profound hearing loss.
Limited benefit from binaural amplification.
Multisyllabic Lexical Neighborhood Test (MLNT) or Lexical Neighborhood Test(LNT) scores ≤ 30%.
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