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Types of Hearing Aids

     There are two major classes of hearing aids, those we call "conventional" and those technologically advanced models that are, for convenience, referred to as "computerized" but are more accurately described as “digital.” In general, conventional hearing aids are less expensive than the high tech ones. The more expensive digital aids are programmable (customizable in many technically sophisticated ways) to amplify speech much as a normal ear does. Also, they are designed to provide continuously comfortable listening regardless of the loudness (or softness) of the voice (or music) you are trying to hear. Most of these models have no need for a volume control.

             

Whether conventional or computerized, hearing aids come in these styles:

   CIC Completely-In-the-Canal

   ITC  In-The-Canal       ITE  In-The-Ear

   BTE  Behind-The-Ear

Regardless of type, all hearing aids consist of these components:

  • a microphone to pick up sound.

  • an amplifier to increase its loudness.

  • a method for regulating loudness.

  m           most conventional models have volume control wheels

  m           most digital models have automatic volume control

  •  an easily replaced battery to power for the amplifier.

  •  a miniature loud speaker (called the "receiver') to present
     amplified and clarified sound to the ear.

  •  a tubing (internal or external) to carry the amplified/clarified
     sound from the receiver to the ear canal.

  •  a custom ear mold or custom molded plastic case which
     secures the hearing aid in place and makes sure the device is
     secure in the ear and efficiently delivering the sound into the
     ear canal.

     In the Canal hearing aids are built into a custom shell housing that fits into the ear canal.

     In the Ear hearing aids are also built into a custom shell housing but because they occupy both the hollow portion of the ear and the ear canal they are larger than the ITC type.

     The typical Behind the Ear hearing aid is an inch or so long and is tucked behind the ear. It conducts amplified sound into the ear canal via a flexible plastic tubing attached to an ear mold specially molded for your ear.

     Completely In the Canal hearing aids offer both cosmetic and acoustic advantages over other types in that they are very small and so can be positioned deep in the ear canal thus enabling them to deliver amplified sound closer to the ear drum (an acoustic advantage) than the other types.

Toward Better Understanding