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38 Cards in this Set

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  • Back
basic components of HA’s?
Input stage, processing stage, & output stage.
criteria for CI for adults?
H/L must be bilateral
Little or no benefit from traditional amplification
benefit from amplification & severity criteria is different for children & adults

how cochlear implants work?

Sound signal picked up by microphone


Signal sent to speech processor for coding


Coded signal returned to transmitter


Coded signal sent to receiver/stimulato


Coded signal sent to electrode array


Electrode array contains numerous electrodes placed in cochlea near auditory nerve tissue


Electrodes stimulate nerve tissue


Stimulation(electrical signal) transmitted via nerve tissue thru CANS to brain for processing

typesof air conduction H/As?

1) body style H/As1


2) Ear-level H/As


-BTE Behind-the-Ear


-ITE In-the-Ear


-ITC In-the-Canal


-CIC Completely-in-the-Canal


-Eyeglass (rare)

What do cochlear implants do?

Cochlear implantselectrically stimulate CNVIII
Whathappens at each stage of hearing aid - Input
Input – Sound goes into H/A & microphone converts soundwaves into electrical signals

What happens at each stage of hearing aid - Processing

Processing – Sound altered & made louder by H/A& the amplifier increases strength of electrical signal

What happens at each stage of hearing aid - Output

Output – sound goes out of H/A into ear & receiverconverts electrical signal back into sound waves

Amount of amplification applied to input signal – measured at output phase. How much louder will it make something?

Acoustic gain

Acousticsignal entering H/A creates “patterns of electrical currents or voltagesanalogous (similar) to those of the acoustic (sound) input”Oldertechnology, still in use today

Analog H/A

Forpeople w/ bilateral CN VIII tumors (ex. from neurofibromatosis) who cannotbenefit from CI because CN VIII isn’t functioning

Auditory brainstem implants

Placed on the cochlear nucleus in the brainstem during same surgery that isremoving tumors.-USFDA approved for patients w/ neurofibromatosis over age 12

Auditory brainstem implants

Forpeople w/ good B/C thresholds

BAHA - bone anchored H/A

Usedw/ chronic M/E pathology

BAHA - bone anchored H/A

Usedw/ atresia of EAM

BAHA - bone anchored H/A

H/Areceiver surgically implanted in temporal bone behind ear

BAHA - bone anchored H/A

Directlystimulates cochlea

BAHA - bone anchored H/A

ReplacesB/C H/A & its more comfy, less noticeable than B/C aid

BAHA - bone anchored H/A

Completeaid fitted to one ear & microphone only fitted to other ear & soundfrom that ear routed to ear w/ complete H/A
BICROS– Bilateral Contralateral Routing of Signals

Usedwhen a person has loss in both ears but only one ear that can be satisfactorilyfitted w/ H/A

BICROS – Bilateral Contralateral Routing of Signals

H/As fit toboth ears

Binaural

- Amplified sound delivered thru bone vibrator/oscillator placed on mastoidprocess rather than thru earmold into EAM


- Used when conventional A/C H/A cannot be used (ex. atresia, chronic otitusexternal or media that is aggravated by presence of earmold)

Bone Conduction H/A

- Not really a “hearing aid’

-Actually processes sound – not just increase loudness


-Replaces function of the cochlea

Cochlear Implants

Signal picked up at one ear & sent via wire or electronically to other ear in
CROS– Contralateral Routing of Signals
Usedwhen a person has loss in one ear but that ear cannot be satisfactorily fittedw/ H/A – sound sent to other ear
CROS – Contralateral Routing of Signals
-Uses analog-to-digital converter changing electricity into numbers which can bemanipulated by a computer to more closely meet clients needs (gain, frequencyresponse, output)

-Newer technology, more flexibility

Digital H/A

- Percentageof output signal that is result of workings of H/A

-Howmuch does it mess up the signal?

Distortion

- Couples(connects H/A to ear)

-Technically not part of the H/A mechanism but can/does alter signal dependingof modifications

Earmolds

-Available gain at each frequency

-How much louder will it make specific pitches?

frequency response

Programsthat help to optimize the CI user’s access to sound by adjusting the input tothe electrodes on the array that is implanted into the cochlea

Map

-Receiver surgically implanted in M/E cavity (usually on ossicular chain)

-External coil placed either behind ear or in ear canal


-For people w/ up to a sever SNL


-Reduces chance of feedback

Middle ear implant

-Acoustic signal converted to electrical energy (input stage – just likeregular/conventional H/A)

-Electrical energy increased/amplified (processing stage – just like regularH/A)


-Amplified energy NOT converted back into acoustic signal (NOT like regular H/A)


-Amplified energy used to make more ossicles so signal introduced into cochlea


-Since there is NO amplified acoustic signal – chances of feedback are reduced

Middle ear implant

H/A fit toone ear

Monaural

-Maximum output H/A can produce


-How loud can it get?

Output sound pressure level

Adjustedvia hand-held programmer or via computer software connected to a PC

Programmable H/A

Signal fromy-cord of H/A sent to both ears

Pseudo-binaural

Similarto TV remote, it allows people w/ vision or dexterity problems that may impactability to manipulate small controls on BTE or ITE

Remote controls for H/As

Used w/ body H/As w/ signal from H/A sent to both ears. AKA Psuedo-binaural

y-cord