Cochlear SPrint Sound Processor Informações Técnicas descarregar pdf (Página 64)

SECTION TWO | CLINICAL GUIDANCE

Table 1: Loudness/sensation strength scale

Auditory Sensation Scale Side Effect

Stop 10 Stop

Too loud 9 Uncomfortable sensation

Maximum comfortable level 8

Very loud 7 Strong sensation

Loud 6

Medium loud 5 Medium strong sensation

Medium 4

Quiet 3 Mild sensation

Very quiet 2

Just hearing 1 Very slight sensation

No sound 0 No sensation

Exceeding safe levels of stimulation

Caution: In Current Level modulation, when stimulus pulse widths exceed

200 µs it becomes possible, at high stimulus output, to create levels of charge

density on the electrodes which exceed established safety margins.

When wishing to increase the intensity of a stimulus beyond 255 units using

Current Level (CL) modulation, you can increase the stimulus pulse width,

either globally or locally, on selected channels. You need to perform this with

caution when using the Nucleus 24 ABI, since with wider pulse widths it could

create levels of charge density on the stimulating electrodes that exceed

recommended biological safety margins applicable to electrical stimulation

of the cortex. Exceeding such limits could lead to a gradual increase in a

recipient’s perceptual threshold over time. This could result in a decrease in

performance and either temporary or permanent damage to the cochlear

nucleus structure. Permanent damage could prevent long term beneﬁt from

the implant.

The recommended values for the safe current level for a variety of pulse width

options (which are applicable regardless of the programming system and/or

software in use) are shown in the table below.

Note: there is an inverse relationship between pulse width and the limit for

safe current level, i.e. as the pulse width is increased, the upper limit of the safe

current decreases (when an ABI24M implant type is selected, an on-screen

visual warning will be given when these limits have been reached).

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Cochlear SPrint Sound Processor Informações Técnicas Página 64