Hearing aids are small electronic devices that amplify sound to help people with hearing loss. They have three basic parts: a microphone that picks up sound, an amplifier that makes sounds louder, and a speaker that sends the amplified sound into the ear. There are two main types of hearing loss - conductive, which is caused by sound being obstructed in the ear and is often treatable with surgery, and sensorineural, which damages the inner ear and is the most common type helped by hearing aids. Modern hearing aids come in various styles like BTE (behind-the-ear) or CIC (completely-in-canal) and can be either analog models or digital models, which have more flexibility to adjust

1. Hearing Aids
Irfan malik

2. What is a hearing aids
– Small electronic device
– Quiet and noisy situations
– 1 out of 5 who needs, actually uses
– Three Basic Parts
– ▫ Microphone
– ▫ Amplifier
– ▫ Speaker

3. How does “hearing” work?
1. Sound travels through
outeer ear
2. Eardrum vibrates
3. Three smalls bones
carry sound to cochlea
4. Vibration stimulates
hair cells
5. Creates electrical
current to auditory
nerve
6. Transmits to brain

4. Hearing aid technology
– Telecoil
– ▫ Connect directly to hearing aid
– ▫ Filters background noise
– ▫ Used with telephones, FM systems,
and induction loop systems
– Directional Microphones
– ▫ Amplify sounds more from front
– ▫ Better signal to noise radio
– ▫ Improves speech understanding in noise

5. What causes hearing loss
– Two types of hearing loss:
– ▫ Conductive hearing loss
– Sound obstructed through the ear
– Treatable with surgery
– ▫ Sensorineural hearing loss
– Damage to the cochlea
– Most common type
– Type helped by hearing aid

6. How do hearing aids work?
– 2 types of hearing aids
– ▫ Analog
– Converts sound waves into electrical signals
– Custom built for each user
– Less expensive
– ▫ Digital
– Converts sound waves into numerical codes
– Similar to binary code
– More flexibility in adjustment

7. Analog hearingaid

8. What type of hearing aids arethere?
• ITE (In-the-Ear)
▫ Mild to severe hearing loss
▫ Completely inside outer ear
▫ Not recommended for children
▫ Capable of added features telecoil
• BTE (Behind-the-Ear)
▫ Fits behind pinna(ear)
▫ Consists of case, earmold, & tube
▫ Sound routed from case to earmold
▫ Mini BTE

9. • ITC(In-the-Canal)
▫ Mild to moderate hearing loss
▫ Customized to recipient
▫ Almost completely hidden
▫ Difficult to adjust and change battery
• CIC(Completely-in-Canal)
▫ Mild to moderate hearing loss
▫ Smaller than ITC
▫ Difficult to adjust and add features
▫ More expensive

10. Cochlear Implant
– Designed for those who are profoundly deaf
– Can be used alone or with traditional hearing aid
– Two main systems:
– ▫ External
– Sound processer, microphone, and
transmitter
– ▫ Internal
– Receiver and electrode array

11. Future for hearingaids
• BAHA(Bone Anchored
Hearing Aid)
▫ Bypass normal
hearing system
▫ Helps severe
sensorineural, condut
ive, or mixed
▫ Attach to bones in
middle ear
▫ Bypasses auditory
canal and middle ear