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SPHI 394

Hearing aids/amplification
by

Nicole Cser

on 2 February 2013

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Transcript of SPHI 394

"Hearing aids are electronic devices that collect sound, amplify it, and direct the amplified sound into the ear. While the style of hearing aid may vary, all hearing aids have similar components:
􀁲􀀁A microphone to pick up sound
􀁲An amplifier to make sounds louder
􀁲􀀁A receiver (miniature loudspeaker) to deliver the amplified sound into the ear
􀁲􀀁Batteries for power"

-ASHA, Audiology Information Series In-the-ear Behind-the-ear Amplification: Hearing Aids Completely-in-the-canal (CIC) (ITE) (BTE) Which type of hearing aid is best for me? In-the-canal (ITC) How do hearing aids work? Lifestyle/Needs Available Features Parts of a Hearing Aid Now that I have my hearing aid what should I be aware of? Daily Care Listening checks
Check batteries
Clean the hearing aid regularly
Avoid moisture
Check for feedback Your lifestyle is one of the greatest factors to determine the type of hearing aid needed. Another important factor an audiologist will
take into consideration is your ability to see and handle the hearing aids. Automatic Volume Control Telephone Coils (t-coils) Feedback (whistling) control Directional microphone Wireless Technology Listening Programs Remote Control Automatically amplifies incoming sound based on your hearing loss. All sounds become comfortable since soft sounds are amplified more than loud sounds
Replaces the volume control on hearing aids Most helpful in noisy rooms or face-to-face conversation Small coils embedded in the hearing aid that allows speech coming through a telephone to be heard clearly. Helpful in large group areas (theaters, auditoriums, etc...) that use loop or FM installations Analyzes the feedback and adjusts the amplification automatically in order to minimize the whistling/squealing noise Allows adjustments made on one hearing aid such as changes in volume to automatically be changed on the other hearing aid. Bluetooth technology now allows users to hear cell phones or radio signals directly into their hearing aids. Offers different programs to adjust for various listening environments and needs. Allows adjustment of hearing aids through a small hand held remote instead of on the device itself. Buying a hearing aid:
Things to consider Can I get my hearing aids from any audiologist? How much will they cost me? Will my health insurance cover my hearing aids? By Nicole Cser & Kelly Hall Not all audiologists dispense hearing aids.
However, if your audiologist does...most people feel they receive a better overall healthcare experience by dealing with the same audiologist for all services. Cost is determined by the style, added features, and services needed for consultation and rehabilitation. Battery replacement costs also factor into the overall maintenance of hearing aids. Batteries may last only several days up to several weeks Factors affecting battery life Power requirements
Type of battery
The routine use of the hearing aid with an assistive listening device Some private healthcare plans cover the cost of most audiology test, hearing evaluations, and partial to full coverage of the hearing aid itself Medicare: Does NOT cover hearing aids Individuals with Disabilities Education Act (IDEA) Hearing Aid Tax Credit proposed law Medicaid: DOES cover hearing aids and services for most adults and children eligible Some costs are covered for early intervention from local school and health systems. Credit of up to $500 per hearing aid, awarded every 5 years for parents purchasing the aid for a dependent child or adults over 55 years of age. -ITE aids fit in the the concha and are used in mild to severe hearing loss
-ITE's are custom fit for each individual, yet not recommended for kids (growth & replacement)
-Can be used with an FM system if wearing an FM receiver
-More expensive than BTE aids (custom fit)
-Occasional feedback problems with severe HL BTE aids consist of a case, an earmold, and a connection between them. Inside the case are the controls, battery, microphone(s) and (sometimes) a loudspeaker. The case sits behind the ear with the connection coming into the ear. The sound is routed acoustically or electrically to the ear. Electrically: the receiver is in the earmold. Acoustically: a plastic tube to delivers the sound from the case’s loudspeaker to the earmold.

-Good for mild to profound HL
-Reduced chances of moisture and earwax damage as all the components are outside of the ear.
-Can be hooked up to assistive listening devices (FM systems)
-Durability (good for children)
-Mini BTE (newer): provides comfort and eases cosmetic concerns Components of a hearing aid: - microphone

- circuitry

- receiver

- battery
*SIZE OF THE AID IS LIMITED BY THE BATTERY SIZE Disadvantage complex processing better signal to noise ratio increased flexibility for fine tuning clarity price

(more expensive than analog hearing aids) Advantages integrity of components If you are going to wear hearing aids you need to have realistic expectations They work better in quiet places. noisy places can become a problem Telephone use can pose a problem A loose fit of the aid can cause feedback problems Being a successful user is MOST important Omnidirectional CIRCULAR POLAR DIAGRAM

has ONLY one microphone (close or far it gives you the same signal all the way around) CAROTID DIAGRAM has dual microphones - 2 mics can capture the signal that comes in front of you & behind you. The signal that comes in 2nd (behind) will not be as strong (loud). Amplifies sounds in front of you while minimizing the sounds coming from behind you.
(Can also be automated) Microphone technology - 1 microphone & 1 receiver

- 1 good ear & 1 bad ear

- The receiver is placed on the good ear and the microphone is placed on the dead ear. The receiver routes the sound to the good ear. BICROS CROS - 2 mics and 1 receiver

- 1 aidable ear and 1 dead ear

- microphone on both ears & receiver on aidable ear. The receiver routes the sound to the better ear. Most popular aids today are digital aids rather than analog. Digital aids have a lot of advantages, but have a price disadvantage. -CIC aids are located inside the ear canal, closer to the eardrum (hidden)
-CIC aids are not visible unless you look directly into the wearer's ear
-Good for mild to moderately severe HL
-Great for fairly severe high frequency sensorineural HL
-Offers a reduction in occlusion (plugged up sensation) except for those with "good" low frequency hearing.
-more expensive than BTE aids
-canal size can pose a problem
-ITC aids are smaller than ITE aids and fill only the bottom half of the external ear and offer natural sound reception.
-ITE --> ITC --> CIC
-Intended for mild to moderately severe HL
-The aid is not visible when you stand in front of the wearer, but is visible from the side view.
-Offers a variety of technology level choices that previously required a larger aid
-Custom made for the individual wearer
-Volume may be hard to adjust and batteries hard manipulate (small size)
-rarely used with kids (growth)
-can get damaged by earwax
Early Identification and Intervention The earlier that hearing loss occurs in a child's life, the more serious is the effect on the child's development of speech, language, communication skills, and learning The History of Hearing Aids The first battery powered hearing aid:
Body Worn Aids
Invented by Harvey Fletcher
Consists of a case and earmold attached by a wire
Case housed amplifier components; earmold contained loudspeaker
The case is the size of a deck of playing cards and carried in your pockets
Provided louder amplification, longer battery life, and lower costs
Still on the market for use today
The first hearing aids:
Funnels and trumpets held up to the ear gather & amplify incoming sound
1700s
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