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Hearing Aids (Instrumental Devices) Amplify Sounds for Reaching into…
Hearing Aids
(Instrumental Devices)
Amplify Sounds for Reaching
into the Ear
Conventional
3 Parts
Microphone
Amplifier
Receiver
Types
Air Conduction HA (Through Reciever ➡️ Ear canal )
Types
Body Worn Types ( Most Common)
Chest Level( Microphone & Amplifier )
Ear Level ( Reciever )
Useful in SEVERE & CONGENITAL DEAFNESS
Behind The Ear ( BTE) Type
Behind The Ear ( Microphone , Reciever , Amplifier )
Couple With Ear Canal with Tubing & [Earmould)
Useful in MODERATE DEAFNESS )
Spectacle Type
Modification Of BTE
Useful in Vision & Hearing Loss
In The Ear (ITE) Type
All in Earmould
Useful in MILD TO MODERATE DEAFNESS
Canal types
ITC ➡️ In the Canal
CIC ➡️ Completely in Canal
Use in Mild to Moderate Hearing Loss
Bone Conduction HA ( Through Bone Vibrator )
Indications
Sensorineural & Conductive deafness
which is not resolved by Medical & Surgical Means.
Deaf Child for Development Of Speech & Learning
Fitting of HA
Considerations
Type & Degree Of Deafness
Type Of Frequency affected
Age Of Patient
Condition Of Ear
Cosmetic Acceptance
Types
Monoaural & Binaural
Binaural With Y Connection
CROS Type
Contralateral Routing Of Signals Type
Microphone in Deaf Ear & Reciever in Better Ear
Useful in Sound Localization coming from
the side of Deaf Ear
Bone Anchored Hearing Aids ( BAHA)
Bypassing External auditory Canal & Middle Ear
Direct Conduction to Cochlea
Parts
Titanium FIXTURE (Anchored into skull bone through OSSEOINTEGRATION )
Titanium ABUTMENT
Sound Processor
Use
Unilateral Deafness
Microtia & Canal Atresia
Chronic Inflammation Of Ear Canal
Conductive / Mixed Hearing Loss in OTOSCLEROSIS & Tympanosclerosis
Comparison to CROS
BAHA implanted on Deaf Ear
➡️Transmits Sound to CONTRALATERAL COCHLEA
by means of BONE Conduction
➡️ Eliminates HEAD-SHADOW Effect ( Which is seen in CROS)
Implantation Surgery
SINGLE stage surgery in Adults ( 3 months for OSSEOINTEGRATION )
TWO Stage Surgery in Children ( 6 months for OSSEOINTEGRATION in 1st stage ) ➡️ Abutment is attached in 2nd stage
Implantable Direct drive Middle Ear HA
Types
Piezoelectric Device
Piezoelectric Crystal Acts as Transducer
Attached to Ossicular Chain
Electromagnetic Devices
Magnet Acts as Transducer
Vibrant Soundbridge Device
External Microphone ➡️ Radio frequency waves through Skin
➡️ Internal VIBRATING OSSICULAR PROSTHESIS (VORP) ( Reciever + Floating Mass Transducer ( FMT) ➡️ To Incus
Uses
Adults > 18 years of age with
Sensorineural Hearing Loss
Advantage
Better Sond Quality
No Discomfort
No Occlusion