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SECTION TWO | CLINICAL GUIDANCE

Table 3: Maximum safe current and corresponding current levels for various

stimulus pulse widths for the Nucleus ABIM implant

Pulse width

(µs)

Maximum safe

Current Level (CL)

25 >255

50 >255

100 >255

150 >255

200 255

250 244

300 235

350 227

400 221

The above table shows that up to pulse widths of 200 µs, the full stimulator

output (255 units) may be safely used. Beyond this, the inverse proportional

relationship between pulse width and maximum safe current imposes Current

Level values progressively less than 255 with increasing Pulse Widths. To ensure

that you remain within established safety limits, please refer to Table 2 above.

Scenario Four

In rare circumstances it may be possible to obtain T-levels on several channels,

yet not achieve C-level on any channel before a side effect occurs, as shown in

Figure 8.

In this case, see Managing side effects. If this does not improve the situation, it

will probably be ineffective to balance these channels to an overall signiﬁcantly

reduced C-level. This may potentially limit the detection of temporal

information in speech.

Figure 8 : T-levels

found with C-levels

not achieved before

a side effect occurs

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