hearing aid

Also found in: Dictionary, Thesaurus, Medical, Legal, Financial, Wikipedia.

hearing aid,

device used in some forms of deafness to amplify sound before it reaches the auditory organs. Modern hearing aids are electronic. They contain a tiny receiver and a transistor amplifier, and are usually battery powered. Some are small enough to fit into an arm of a pair of eyeglasses, or into the outer ear. The bone-conduction hearing aid, placed behind the ear, channels sound waves to the adjacent bony part of the skull, which then transmits the vibrations to the auditory nerve of the cochlea. The air-conduction hearing aid amplifies sounds and directs them into the ear toward the tympanic membrane. In recent years, a number of advancements have been made to hearing aids, improving the comfort, sensitivity, and aesthetic quality of the devices. Today, many hearing aids are customized to amplify only those noises (e.g., high frequency) that the user has difficulty hearing. Cochlear implants have been developed for use by certain totally deaf people. They consist of mechanical replacements for ineffective hair cells in the inner ear, which transform sound vibrations into electronic impulses that stimulate the auditory nerve.

Hearing Aid


a sound-amplifying device used by persons afflicted with deafness or impaired hearing. The earliest hearing aids were purely acoustic devices, such as ear trumpets, whose narrow end was inserted into the ear. Modern hearing aids are electroacoustic devices consisting of a microphone, an amplifier, and an earphone. The sound enters the microphone, where it is converted into electric voltage. Amplified by electronic tubes or transistors, this voltage enters the earphone, where it is reconverted into amplified sound.

Hearing aids differ in design according to the nature of the auditory impairment. The standard earphone, inserted into the ear, transmits amplified sound into the external ear, and the bone conduction receiver, pressed against the mastoid process of the temporal bone, transmits sound into the inner ear.

Miniature hearing aids have a miniature earphone that is attached to an individually molded insert in the external ear. Some hearing aids are built into eyeglass frames or hair clips. Pocket hearing aids are manufactured as well. Hearing aids are prescribed by a physician and individually fitted in specialized laboratories after exhaustive hearing tests.

hearing aid

[′hir·iŋ ‚ād]
(engineering acoustics)
A miniature, portable sound amplifier for persons with impaired hearing, consisting of a microphone, audio amplifier, earphone, and battery.

hearing aid

a device for assisting the hearing of partially deaf people, typically consisting of a small battery-powered electronic amplifier with microphone and earphone, worn by a deaf person in or behind the ear
References in periodicals archive ?
There has been a lot of consolidation in the industry, where hearing aid companies are buying practices," Sandler said, noting that The Hearing Center remains independent and not tied to any particular hearing aid manufacturer or representative.
Located on the Gold Coast, Advanced Hearing Aid Centre is a privately owned company that offers private and professional services in hearing care including hearing tests, diagnosis, hearing aids, and customized hearing plugs.
So before you even think of buying a hearing aid - make sure you're armed with this revolutionary new FREE Hearing Aid Guide.
They'll show you how to use the hearing aid and discuss looking after it with you.
Hence, the potential of conversion to binaural devices and replacement of existing ones with the help of new technology are likely to drive the growth of the hearing aids market.
The original legislation, House Bill 52, An Act to provide access to hearing aids for children, was co-sponsored by Mr.
Around 6,500 hearing aid users will benefit from the service, which will give access to advice and information about their hearing aids and hearing loss as well as getting support in hearing aid maintenance.
A hearing aid can be directly connected to a device that is audio-input compatible, i.
While a hearing aid can indeed improve your life by improving your ability to hear, they are not cheap.
While the OTO Tech is carrying out the more basic services and administrative duties, the audiologist is freed to perform more complex services, such as hearing aid fittings, cochlear implant rehabilitation, balance therapy, and auditory brainstem responses.
It seems to me they need some quality control to make sure that when the hearing aid is given back to the patient it's OK," he said.
Until the first wave of the project in October last year, leading-edge digital hearing aids were only available from private hearing aid dispensers, for about pounds 2,000 each.