Parts of The Cochlear Implant
The implant is surgically placed under the skin behind the ear. The basic parts of the device include:
- External:
- one or more microphones which picks up sound from the environment
- a speech processor which selectively filters sound to prioritize audible speech, splits the sound into channels and sends the electrical sound signals through a thin cable to the transmitter,
- a transmitter, which is a coil held in position by a magnet placed behind the external ear, and transmits power and the processed sound signals across the skin to the internal device by electromagnetic induction,
- Internal:
- a receiver and stimulator secured in bone beneath the skin, which converts the signals into electric impulses and sends them through an internal cable to electrodes,
- an array of up to 22 electrodes wound through the cochlea, which send the impulses to the nerves in the scala tympani and then directly to the brain through the auditory nerve system. There are 4 manufacturers for cochlear implants, and each one produces a different implant with a different number of electrodes. The number of channels is not a primary factor upon which a manufacturer is chosen; the signal processing algorithm is also another important block.
Read more about this topic: Cochlear Implant
Famous quotes containing the words parts of, parts and/or implant:
“We have good reason to believe that memories of early childhood do not persist in consciousness because of the absence or fragmentary character of language covering this period. Words serve as fixatives for mental images. . . . Even at the end of the second year of life when word tags exist for a number of objects in the child’s life, these words are discrete and do not yet bind together the parts of an experience or organize them in a way that can produce a coherent memory.”
—Selma H. Fraiberg (20th century)
“Our books are false by being fragmentary: their sentences are bon mots, and not parts of natural discourse; childish expressions of surprise or pleasure in nature; or, worse, owing a brief notoriety to their petulance, or aversion from the order of nature,—being some curiosity or oddity, designedly not in harmony with nature, and purposely framed to excite surprise, as jugglers do by concealing their means.”
—Ralph Waldo Emerson (1803–1882)
“A cynic might conclude that the real purpose of the $500 million-a-year implant business is the implantation of fat in the bellies and rumps of underemployed plastic surgeons.”
—Barbara Ehrenreich (b. 1941)