Candidate Selection Quick Guide - For professionals

Medical indications
Candidate Selection Quick Guide
Audiological indications for Baha ® candidacy
Hearing level (dBHL)
-10
0
10
20
30
40
50
60
70
80
90
100
110
120
125
250 500 1K 2K 4K 8K 125
Frequency (Hz)
Conductive hearing loss
• The conductive component of the hearing
loss is greater than 30 dB.
Very little amplification required as the
conductive component is bypassed via direct
bone conduction.
Conductive/mixed losses
• Cholesteatoma
• Chronic mastoiditis/mastoid cavity
• Chronic otitis media
• Conditions precluding the use of
conventional hearing aid
• Congenital aural atresia
• Draining ears
• Ear canal stenosis
• External otitis
• Genetics
• Ossicular disease
• Otosclerosis
• Other middle ear dysfunctions
• Syndromic hearing losses
SSD
• Acoustic neuroma
• Genetics
• Meniere’s disease
• Neurological degenerative disease
• Ototoxic treatments
• Sudden idiopathic deafness
• Surgical intervention
• Trauma
Hearing level (dBHL)
-10
0
10
20
30
40
50
60
70
80
90
100
110
120
250 500 1K 2K 4K 8K 125
Frequency (Hz)
Mixed hearing loss
• The conductive component of the
hearing loss is greater than 30 dB.
• Mild to moderate sensorineural
component to the hearing loss.
The greater the air-bone gap, the more the
candidate will benefit from Baha ® .
Candidate evaluation
Adult candidate
Test:
• Pure tone audiometry
• Speech audiometry
• Sound field test with
testband/test rod/Softband
Considerations:
• Ensure the client’s expectations
are realistic.
• When demonstrating with a
headband, consider trying a stronger
head worn sound processor than
indicated by the audiogram.This
provides an experience that more
closely demonstrates the benefits
of the implanted device.
Hearing level (dBHL)
-10
0
10
20
30
40
50
60
70
80
90
100
110
120
250 500 1K 2K 4K 8K
Frequency (Hz)
Single-sided deafness (SSD)
• Normal hearing in the good ear.
The head shadow effect is overcome leading
to improved speech understanding and 360°
sound awareness.
Pediatric candidate
Test:
• Use age appropriate tests to evaluate
audibility and speech understanding.
• Use a Baha Softband to determine
the benefit of Baha.
Considerations:
• We recommend fitting a Baha
Softband prior to surgery and
until sound processor fitting.
• When demonstrating with a Baha
Softband, consider using a stronger
head worn sound processor than
indicated by the audiogram.This
provides an experience that more
closely demonstrates the benefits
of the implanted device.
For more detailed information on indications and benefits, see the Baha Candidate Selection Guide.

Processor overview Benefits Profile Fitting range
dBHL
dBHL
u
-10
0
10
20
30
40
50
60
70
80
90
100
110
120
125
Device Selection Quick Guide
250 500 1000 2000
v w
Sensorineural
Component
Total Hearing
Loss
Frequency [Hz]
Frequency (Hz)
4000 8000
Bone-conduction thresholds within this area
Air-conduction thresholds may extend into this area
• Conductive hearing loss
• Mixed loss with a mild
sensorineural component
• SSD
Baha Divino ® benefits:
• Optimal speech understanding in
noise with the directional microphone.
• Crystal clear sound quality from
digital signal processing.
• Adjustable AGCo.
• Adjustable tone control.
• Protection from sudden unexpected
noises via dual time constants.
x
X
y U
u Program selector
v Microphones
w Direct Audio Input (DAI)
x Volume control
y Plastic snap connector
U Battery compartment (battery size 13)
V Attachment point for the safety line
W AGCo- Adjustable automatic gain control
X L-Low frequency gain control
W
V
dBHL
dBHL
u
-10
0
10
20
30
40
50
60
70
80
90
100
110
120
125
v
5
Frequency [Hz] Frequency (Hz)
Bone-conduction thresholds within this area
Air-conduction thresholds may extend into this area
2
x
w
Sensorineural
Component
Total Hearing
Loss
250 500 1000 2000
V
X
W
y
4000 8000
• Mixed hearing loss with a mild to more
moderate sensorineural component
• SSD
• Risk of progressive hearing loss
Baha Intenso benefits:
• Maximum power in a head worn device.
• Crystal clear sound quality from digital
signal processing.
• Multi-band Active Feedback
Cancellation system.
• Adjustable tone and gain controls.
• Protection from sudden unexpected
noises via dual time constants.
u Volume control
v Program selector P1, P2 and E
w Direct Audio Input (DAI)
x Microphone
y Battery compartment (battery size 675)
U Attachment point for the safety line
V Plastic snap connector
W L-Low frequency gain control
X G-Gain control
U
dBHL
dBHL
-10
0
10
20
30
40
50
60
70
80
90
100
110
120
125
Total Hearing
Loss
250 500 1000 2000
x y
w
Frequency [Hz] Frequency (Hz)
4000 8000
Bone-conduction thresholds within this area
Air-conduction thresholds may extend into this area
• Moderate to severe mixed
hearing losses
Baha ® Cordelle II benefits:
• Body worn unit for maximum power.
• Adjustable tone and gain controls.
• Adjustable trim controls to normalize
loud or quiet sounds.
• Built-in telecoil.
w
v W
u
Sensorineural
Component
U
v
V
u Tone switch
v Direct Audio Input (DAI)
w Program switch M/MT/T
x Microphone
y Volume control, on/off
U Plastic snap connector
V Electrical output
W LB Loudness boost
X TK Threshold knee
at Clip
ak Battery compartment (9V rechargeable)
X
at
ak
Baha and Baha Divino are registered trademarks, and Baha Intenso is a trademark of Cochlear Bone Anchored Solutions AB.
Cochlear and the elliptical logo are trademarks of Cochlear Limited. © 2008 Cochlear Bone Anchored Solutions. All rights reserved. E81220 MAR08. www.cochlear.com