Robert Wood Johnson University Hospital
 

Hearing Aids

Hearing Aids

What are hearing aids?

Nearly 36 million adults in the U.S. have some degree of hearing loss. Hearing aids can help improve hearing and speech especially in persons with sensorineural hearing loss (hearing loss in the inner ear due to damaged hair cells or a damaged hearing nerve). Sensorineural hearing loss can be caused by virus or bacteria, noise, injury, infection, aging, certain medications, birth defects, tumors, problems with blood circulation or high blood pressure, and stroke.

Hearing aids are electronic, battery-operated devices that can amplify and change sound. A microphone receives the sound and converts it into sound waves. The sound waves are then converted into electrical signals.

What are the different types of hearing aids?

The type of hearing aid recommended for the individual depends on the person's home and work activities, his or her physical limitations and medical condition, and personal preference. There are many different types of hearing aids on the market, with companies continuously inventing newer, improved hearing aids every day. However, there are four basic types of hearing aids available today. Consult your health care provider for additional information on each of the following types:

In-the-ear (ITE) hearing aids

Picture of an in-the-ear hearing aid

These hearing aids come in plastic cases that fit in the outer ear. Generally used for mild to severe hearing loss, ITE hearing aids can accommodate other technical hearing devices, such as the telecoil, a mechanism used to improve sound during telephone calls. However, their small size can make it difficult to make adjustments. In addition, ITE hearing aids can be damaged by ear wax and drainage.
Behind-the-ear (BTE) hearing aids

Picture of a behind-the-ear hearing aid

Behind-the-ear hearing aids, as the name implies, are worn behind the ear. This type of hearing aid, which is in a case, connects to a plastic ear mold inside the outer ear. These hearing aids are generally used for mild to severe hearing loss. However, poorly fitted BTE hearing aids can cause feedback, an annoying "whistling" sound, in the ear.
Canal aids Canal aids fit directly in the ear canal and come in two sizes: in-the-canal (ITC) aid and completely-in-canal (CIC) aid. Customized to fit the size and shape of the individual's ear canal, canal aids are generally used for mild to moderate hearing loss. However, because of their small size, removal and adjustment may be more difficult. In addition, canal aids can be damaged by ear wax and drainage.
Body aids Generally reserved for profound hearing loss, or if the other types of hearing aids will not accommodate, body aids are attached to a belt or pocket and connected to the ear with a wire.

Who may be a candidate for hearing aids?

Anyone who has hearing loss that may be improved with hearing aids can benefit from these devices. The type of hearing aid recommended may depend on several factors, including, but not limited to:

Wearing a hearing aid

Once the hearing aids have been fitted for the ears, the individual should begin to gradually wear the hearing aid. Because hearing aids do not restore normal hearing, it may take time to get used to the different sounds transmitted by the device. The American Academy of Otolaryngology-Head and Neck Surgery recommends the following when beginning to wear hearing aids:

Taking care of hearing aids

Hearing aids need to be kept dry. Methods for cleaning hearing aids vary depending on the style and shape. Other tips for taking care of hearing aids include:

Considerations when purchasing a hearing aid

A medical examination is required before purchasing a hearing aid. Hearing aids can be purchased from an otolaryngologist (a doctor who specializes in disorders of the ear, nose, throat, and related structures of the head and neck), an audiologist (a specialist who can evaluate and manage hearing and balance problems), or an independent company. Styles and prices vary greatly. Consider the following questions when buying hearing aids:

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Online Resources of Otolaryngology

 

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