Procedures Surgeries - Hearing Aids

What is a hearing aid?

A hearing aid is a device which amplifies the sound and thus improves the hearing.

How are hearing aids classified?

Hearing aids can be classified into:

  • Air conduction hearing aids
  • Bone conduction hearing aids
  • Environmental aids

About Air conduction hearing aids:

They are most commonly prescribed. Here the amplified sound is transmitted via the external auditory canal to the tympanic membrane.

Types of Air conduction hearing aids

  1. Body worn type:
    The microphone and amplifier with the battery are worn on the chest while receiver is at the ear. Used in severely deaf persons and congenital deafness.
  2. Behind the ear:
    The whole hearing aid unit is worn behind the ear. Sound is transmitted to ear canal via a silicon tube or mould. This type is useful in moderate to severe hearing loss and cosmetically better. It is also easier to maintain.
  3. In the Ear:
    The whole hearing aid is in a mould fitted in the ear canal. It is useful in mild to moderate loss. Cosmetically, it is very good.
  4. In the canal:
    This one is also called invisible hearing aid. The whole unit is in the external canal. It is useful in mild to moderate hearing loss. This has excellent cosmetic results.
  5. Spectacle type:
    The unit is incorporated in the auricular part of spectacle frame Not very popular.
  6. Programmable heavy aids / Computerized hearing aids:
    These aids can be programmed according to needs of the patients and environmental conditions. They can be used in any degree of hearing loss.

What are the mechanics of a hearing aid?

Hearing aid has 5 main parts:

  1. Microphone: It fits into the hearing aid, collects sound energy and converts it into electrical energy.
  2. Amplifier: Increases the amplitude of impulses generated.
  3. Earphone: Converts electrical energy into sound.
  4. Battery: Provides power supply.
  5. Mould: Holds the hearing aid in place and acts like a seal.

What are the indications for hearing aids?

  1. Hearing loss due to damage or weakness of the Hearing nerve(Sensorineural hearing loss) due to various reasons like presbyacusis, ototoxicity.
  2. Patients with conductive hearing loss like otosclerosis, chronic suppurative otitis media (safe type) who are unfit or unwilling for surgery.

Some popular hearing aids:

Bombay Hospital and Medical Research Center
201, 2nd Floor, New Wing 12,
New Marine Lines
Mumbai - 400020
Contact Phone No: 91-022-25283707 Contact Mob No: 07715050774

Juvekars Nursing Home
17/18, Shivsagar CHS
Opposite Akbarallys,
Off Sion Trombay Road
Chembur East, Mumbai -71
Tel: +91-22-25271140

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