Cochlear SPrint Sound Processor Información técnica Pagina 24
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SECTION ONE | CLINICAL GUIDANCE
22
Increasing the pulse width may result in the number of maxima being reduced
automatically. The 3500 Hz per channel stimulation rate only allows a pulse
width of 9.6 µs.
It is important to optimize a recipient’s power level to ensure that all channels
are in compliance, to allow the widest range of MAP parameters to be used
for a given recipient, and to maximize sound processor battery life.The CP810/
Freedom sound processors (CI500 series, Nucleus Freedom, and Nucleus
24 implant types) and Custom Sound software can automatically optimize
the power level used by the processors to power the implant. Manual
adjustments of Power Level can also be made and affect compliance, therefore
it is recommended to remeasure compliance at the specified power level to
avoid ‘out of compliance’. Please refer to section 1.8 Power Optimization for
additional information.
Currently only limited clinical information is available regarding the possible
effects of ‘out of compliance’ channels on recipient performance. These effects
may include the recipient reporting the MAP to be too soft or fluctuating in
loudness, or that no loudness growth occurs when increasing C-levels on a
channel. The current recommendation is to keep all active channels/electrodes
used in the MAP within the voltage compliance limits for the battery type that
will be used. Thus, it is recommended that the MAP be modified to keep all
active electrodes in voltage compliance. Channels that remain out of voltage
compliance should be deactivated.
Note : It is known that electrode impedance, and therefore compliance,
may change over the first weeks of experience with the cochlear implant.
If some electrodes are ‘out of compliance’ at initial device activation, it
is recommended that the MAP be modified to bring these channels into
compliance or that the electrodes be deactivated. Electrode impedances
should be measured at every clinical visit.
1.7.2 Nucleus
®
24 System
The SPrint
™
processor provides the same Compliance Telemetry information
in psychophysics as the CP810 and Freedom
™
sound processors. CI500 series
and Freedom implants have the added functionality for the user to request
compliance information. When using the ESPrit
™
3G sound processor, where
there is no telemetry functionality available, it is recommended that the
SPrint or Freedom processor be used at regular intervals for programming, i.e.
particularly when changes to T- and C-levels are observed. It is also important
to do a new impedance test at regular intervals. Converting the SPrint MAP to
the ESPrit 3G provides information about whether the ESPrit 3G MAP is within
compliance. The Custom Sound
™
software provides guidance regarding any
- Cochlear 1
- Getting started 5
- T-level Assessment Procedures 6
- C-level Assessment Procedures 7
- 1.1.1 Behavioural Procedures 9
- Figure 2 : Loudness 18
- Base Level = 4 18
- Q varies 18
- 1.5 STIMULATION MODES 19
- Figure 3: Bipolar 20
- 1.6 TELEMETRY MEASUREMENTS 22
- and N24 series Cochlear 23
- Implant Systems 23
- 1.7 VOLTAGE COMPLIANCE 23
- 1.7.1 CI500 series, Freedom 23
- 1.7.2 Nucleus 24
- 24 System 24
- 1.7.3 Nucleus 25
- 22 System 25
- 1.8 POWER OPTIMIZATION 25
- 1.9 SOUND CODING STRATEGIES 29
- 1.9.1 ACE 30
- /ACE (RE) 30
- 1.9.2 SPEAK 31
- 1.9.3 CIS/CIS (RE) 33
- 1.11.1 Microphone Sensitivity 36
- 1.11.2 Volume Setting 37
- 1.12 NUCLEUS 38
- SMARTSOUND 38
- 1.12.1 ADRO 38
- 1.12.2 Whisper 39
- Whisper boosts soft 40
- 1.12.3 Focus (using Beam 41
- Figure 13 : A block 42
- 1.12.4 Zoom 45
- CP810 Zoom 46
- Freedom Dir / 46
- CP810 Standard 46
- (without zoom) 46
- Processor 46
- 1.12.5 Autosensitivity 47
- 1.13 SMARTSOUND 48
- ENVIRONMENTS 48
- Environment Options 49
- EVERYDAY 49
- 1.14 OBJECTIVE MEASUREMENTS 51
- 1.15 GUIDANCE FOR FM FITTINGS 53
- 1.15.1 CP810 Sound Processors 53
- SECTION 2: PROGRAMMING 57
- RECOMMENDATIONS FOR 57
- SPECIALTY DEVICES 57
- Figure 2: 58
- Descriptive 58
- Nucleus 24 ABI 58
- 2.1.1.2 Programming the ABI 59
- Pitch magnitude 1 – 100 60
- Loudness 1 – 10 60
- Figure 8 : T-levels 66
- 2.1.1.3 Managing Side Effects 67
- 2.1.1.4 Fine Tuning the ABI 68
- Figure 9 : Nucleus 70
- ABI 24M pitch 70
- 2.1.1.6 Rehabilitation 71
- 2.1.1.7 ABI Worksheets 72
- 2.1.2 THE NUCLEUS 74
- 24 DOUBLE ARRAY 74
- CLINICAL GUIDANCE 77
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