Hearing Aids
Hearing Aids are devices designed for people with various degrees of hearing loss and enable them to hear sounds by making sounds audible. These devices do not correct hearing loss but aid a person with hearing loss to hear clearly. Hearing aids are helpful in various type of hearing losses including conductive hearing loss, sensorineural hearing loss and single sided deafness.
Most hearing aids consist of a microphone to pick up sound, an amplifier circuit to make the sound louder, a receiver to deliver the sound to the ear canal and batteries. Hearing aids can be digital or analog:
Analog
These hearing aids amplify all sound waves in a similar manner. They are usually programmable for different settings and listening environments. Analog hearing aids are less commonly used than digital hearing aids.
Digital
Digital hearing aids have additional features like conversion of sound waves to digital waves which make them sound exactly like a duplication of the original sound to be amplified. They might also be equipped with advance features like background sound cancellation and noise cancellation.
Hearing aids have evolved to be manufactured in various styles. The style of hearing aid is usually suggested by an audiologist who would consider the person’s requirements and accordingly choose the most suitable style of hearing aid.
1.Behind The Ear (BTE) Aids
The parts of this hearing aid are contained inside a tiny plastic case which is placed behind the ear. These are easy to clean and maintain.
2.Mini BTE Aids (on the ear)
This is a relatively new type of BTE aid which allows for lesser occlusion and is better for cosmetic purposes.
3.In the Ear (ITE) Aids
These hearing aids consist of a shell containing parts of the hearing aid which sit inside the outer ear.
4.In the Canal (ITC) and Completely in the Canal (CIC) Aids
The parts of these hearing aids are contained in cases which can be partly or completely placed in the ear canal. These are the smallest of all hearing aids.
5.Contralateral Routing of Signals (CROS) Hearing Aids
These hearing aids are used to reduce unilateral hearing loss by transmitting the sounds from the ear having poorer hearing capability to the ear with better hearing. This can be of either BTE type or ITE type.
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