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49 Cards in this Set
- Front
- Back
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What are the four basic components to hearing aids?
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1) Microphone
2) Amplifier 3) Receiver 4) Battery |
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A microphone is an example of a ________.
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Transducer
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The microphone picks up incoming signal in dBSPL and changes it into an _________ form.
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Electrical
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What does the amplifier on a hearing aid do?
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Increases the electrical voltage from the microphone-- it makes it larger. Thus, you have an amplified signal. Important here is the concept of GAIN.
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What is the most important concept when it comes to the amplifier in a hearing aid?
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Gain.
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GAIN = ______ + _______
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Output - Input
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What type of batteries are commonly used in hearing aids today?
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Zinc Air
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How much voltage does a Zinc Air battery put out in a hearing aid?
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1.3 - 1.4 volts.
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What are four advantages of Zinc Air Batteries?
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1) Last longer
2) Longer shelf Life 3) Less expensive 4) Contain no chemicals that may affect the environment. |
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What is the expected shelf life of a Zinc Air battery?
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2-3 years (under normal conditions)
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Hearing aid batteries are coded by (3 things):
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1) number
2) Size 3) Color |
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What are five things that affect the life of a battery?
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1) Daily usage
2) Volume control setting 3) Heat/humidity 4) Circuit requirements 5) Battery Size |
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The receiver, like the microphone, is a _________.
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Transducer
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The receiver turns the signal from _________ to ________ energy.
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Electrical to acoustic energy.
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Receivers operate just like ___________.
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Loudspeakers.
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What is the purpose of a telecoil in a hearing aid?
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To allow the patients to comfortably use the phone.
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What is a telecoil?
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Small coil made up of numerous windings of copper wire around a metal bar. Electromagnetic energy from the telephone receiver is picked up by the telecoil and amplified by the hearing aid. Thus, the telecoil becomes the input to the hearing aid.
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The telecoil when being used provides a better SNR? T or F.
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True.
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T or F: the telecoil is included in all modern hearing aids.
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False.
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What is PL 97-410?
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Telecommunications for Disabled Act. Mandates that all corded and cordless phones sold in this country be compatile with hearing aids.
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What is Loudness Recruitment?
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The reduced range between when sounds are audible and uncomfortably loud. For these patients, loudness perception grow abnormally fast.
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What is dynamic range?
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Between barely audible and uncomfortably loud. For example:
50dB is audible and 120 dB is uncomfortable. The dynamic range would be 70 dB. |
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What is the best way to make sure the hearing aid will never exceed an uncomfortable level for patients?
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By using some form of compression. This squeezes it into a smaller operating space.
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T or F: Compression (output limiting) can be done independently for high and low frequencies.
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True.
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Describe what listening programs are..
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Stored programs on a hearing aid that affect how the hearing aid operates in various listening situations. They are used to optimize the audibility and comprehension in specialized situations.
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T or F: remote controls are included with all hearing aids.
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False. Just some of the newer more sophisticated ones.
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What is this describing?:
have two inlets for sound; one on the front and one on the back. They are differentially sensitive to sound location. They act to reduce sounds from behind the listener; thus improving SNR. |
Directional Microphones.
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What is a new hearing aid connectivity option?
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Bluetooth.
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Digital hearing aids make up ~__% of the hearing aids sold in the U.S.
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97%
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How are hearing aids programmed?
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With Bluetooth or cables.
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The hearing aid style that a patient gets depends on their _____ and ________.
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Needs and preferences.
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Veterans association is responsible for __-__% of all Hearing Aid sales.
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16-17%
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What is the average life expectancy for digital Hearing Aid?
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6-7 years
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What are four styles of hearing aids?
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1) Behind the Ear
2) In the Ear 3) In the Canal 4) Completely in Canal |
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What is a feature you might lose by getting a smaller in the ear hearing aid?
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telecoil
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Describe penetration rate.
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The people that have a loss and use a HA.
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If the penetration rate is 24%, how many people havea loss but don't use a hearing aid?
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75%.
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65% of hearing aid sales account for what style of hearing aid?
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BTE
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Why are most hearing aid sales BTE?
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Because you can fit any type, degree and configuration with a BTE.
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What style of hearing aid accounts for 1/2 of all sales?
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ITE
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ITC hearing aids are primarily for those that have _______-_______hearing loss.
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Mild-moderate
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Which is the smallest of the hearing aid styles?
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CIC
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What would be the reason for someone to get a bone conduction hearing aid?
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They have conductive hearing losses. Air conduction aid cannot be used.
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What is atresia and what type of hearing aid would they use?
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Atresia is when there is no opening to the ear. These patients would use a bone conduction aid.
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T or F: an ear impressions is required for all hearing aid styles.
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True (that's what the notes say, but would open fit aids need them??)
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What are three functions of earmolds?
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1) couple the hearing aid to the patients ear
2) provides support for the BTE aid 3) directs and modifies the amplified sound that reaches the ear canal |
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What are three important factors when selecting a hearing aid candidate?
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1) degree of hearing loss
2) communicative difficultures 3) motivation to use aid |
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When should fittings be done after identification of hearing loss?
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As soon as possible.
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What is the goal in fitting hearing aids?
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To amplify as much of the speech spectrum as possible and keep the auditory signals within a comfort range for the patient.
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