Hearing Aids Flashcards
What is the function of Hearing aids?
Hearing aids
- Amplify the sound
- By-pass an impairment
- Stimulate the nerves
Name different Hearing Aids.
Hearing Aids
- Air Conduction Devices (ACD)
- Bone Conduction Devices (BCD)
- Middle Ear Implants (MEI)
- Cochlear Implants (CI)
- Auditory Brainstem Implants (ABI)
Difference between Air Conduction and Bone Conduction?
Air Conduction and Bone Conduction
Why does your voice sound different than you usually hear it when recorded?
Bone Conduction
Pathway of Bone Conduction when using a transducer?
Pathway of Bone Conduction when using a transducer
Explain the pathways of sound.
Explain different types of Hearin losses.
Hearing loss
- Conductive loss - outer and middle ear
- Sensorineural loss - inner ear and audiotory nerve.
- Mixed loss - mix of conductive and sensorineural loss
- Central loss - nerve system of brainstem or brain
- Non-organic loss - no anatomical or physiological damage can be shown despite hearing loss
How is an investigation of Hearing loss conducted?
Hearing Loss Investigation
- Air conduction thresholds
- Bone conduction thresholds
- Air-bone gap => conductive hearing loss
- Speech thresholds
- Auditory brainstem response
- Otoacoustic emission
Describe the AC Hearing Aid.
Air Conduction Hearing Aid
- Sensorineural loss
- Presbyacusis (age related loss)
- Provides amplified sound in ear-canal
Describe BC Hearing Aid.
Bone Conduction Hearing Aid
- Conductive/Mixed loss
- Provides vibrations that bypass the middle ear
- Bilateral implants
- Single-sided deafness
Describe MEI Hearing Aid.
Middle Ear Implants
- Conductive/Sensorineural/Mixed loss
- Provides vibrations on ossicular chan or oval/round window
Explain CI Hearing Aids.
Cochlear Implants
- Sensorineural loss
- Auditory nerve must function
- Stimulate cochlea with electrodes
Explain ABI Hearing Aid.
Auditory Brainstem Implants
- Non-functioning auditory nerve
- Soft silicon matrix with 12 electrodes
- Stimulate the cochlear nucleus, directly on the brainstem
