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Chapter 43: Implantable Hearing Devices
Terms in this set (18)
Bone-anchored hearing systems types
Surgical options → direct drive with an abutment or skin drive with a magnet
Non-surgical options → processor worn on a headband
Digital sound processor similar to a hearing aid
A bone-anchored hearing system for Conductive or mixed hearing loss bypasses
the outer and middle ear to transmit directly to the inner ear
A bone-anchored hearing system for single-sided deafness (SSD) bypasses
The deaf side entirely and stimulates the opposite ear cochlea.
2 requirements for candidates for cochlear implants
Must have moderate to profound SENSORINEURAL hearing loss
MUST show inadequate benefit from hearing aids
External components of a cochlear implant include
Which part of a cochlear implant picks up sound and transduces it to electrical energy?
Which part of the cochlear implant is coded for transmission to internal device?
Which part of the cochlear implant transfers data from the speech processor to the transmitter coil?
Which part of the cochlear implant holds a magnet and communicates with the INTERNAL receiving coil
Internal components of a cochlear implant
Which part of a cochlear implant is the antenna that receives the transmitted signal from the transmitter coil and a magnet that connects to the external magnet
Which part of a cochlear implant is inserted into the cochlea?
How does a hybrid cochlear implant work?
Low-frequency sounds presented via hearing aid
High-frequency sounds presented via implant
cochlear implant option that is only for adults
Hybrid implants require patients to have what kind of hearing?
residual low-frequency hearing that can benefit from a hearing aid
Preoperative testing for cochlear implants is EXTENSIVE! Includes the following:
Imaging (CT, MRI): ensure nerve of implant ear is structurally sound, cochlea is able to be implanted
Audiologic evaluation (unaided)
Electrophysiological testing: test for ANSD, ensure nerve is functional
HA evaluation (aided testing): evaluate the patient with appropriately fit hearing aids... remember, they must show inadequate benefit!
Speech and language evaluation
Psychological evaluation: is the patient psychologically sound and able to handle a CI
Patient education: communicate realistic expectations and follow up
Determine implant ear (if only one is to be implanted)
Postoperative management of cochlear implant patients measures what at EACH electrode/frequency possible:
T-levels: threshold levels (softest detected through the CI)
M-levels: most comfortable levels
C-levels: loud but comfortable levels
What does bimodal mean?
hearing aid in one ear, cochlear implant in the other ear
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