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SECTION ONE | CLINICAL GUIDANCE

1.5.2 Bipolar (BP) Stimulation

In BP stimulation, both the active and indifferent electrodes are inside

the cochlea. The separation between the two electrodes deﬁnes the BP

conﬁguration and the spread of current within the cochlea (see Figure 3). The

smaller the distance between the active and indifferent electrodes, the more

current required to reach T- and C-levels, probably because a smaller amount

of neural tissue is stimulated.

• Bipolar (BP): Current ﬂows between the active electrode and the electrode

next to it in the apical direction (e.g. E1 to E2).

• Bipolar + 1 (BP+1): Current ﬂows between the active electrode and the

electrode that is two away from it (e.g. E1 to E3).

• Bipolar + x (BP+x): X refers to the number of electrodes between the active

and indifferent electrodes (e.g. E1 to E5 is called BP+3).

As the BP conﬁguration becomes wider, the number of channels of stimulation

decreases, for example, in BP+3 there is a total of 18 possible channels. The

optimal BP mode provides comfortably loud hearing with the smallest distance

between the active and indifferent electrodes. Bipolar modes may be used

with the Spectral Peak (SPEAK) strategy.

Figure 3: Bipolar

stimulation

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