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SECTION TWO | CLINICAL GUIDANCE

2.1.2 THE NUCLEUS

24 DOUBLE ARRAY

The Nucleus

24 Double Array (CI 11+11+2M) cochlear implant is based on the

Nucleus 24 (CI24M) cochlear implant. The receiver/stimulator and reference

electrodes are identical to those of the Nucleus 24.

The electrode array is split in two parts, a basal array for insertion into the basal

turn of the scala tympani and an apical array for insertion into the apical turn of

the scala tympani. The basal array has 11 active electrodes (numbered from 1 to

11) and 10 stiffening rings. The apical array carries 11 active electrodes (numbered

from 12 to 22) and 9 stiffening rings. It can be identiﬁed by a large gap between

the last two stiffening rings. The apical array exits the receiver/stimulator in the

middle between the other two arrays (Figure 12). The basal array (electrodes 1

to 11) is inserted into the basal turn of the scala tympani and the apical array

(electrodes 12 to 22) is inserted into the second turn of the scala tympani, thus

providing the same electrode order (1 to 22) as the Nucleus 24 cochlear implant.

An x-ray may be used to conﬁrm the insertion orientation by identifying the

large gap between the last two stiffening rings of the apical array.

The active electrodes are numbered from 1 to 11 (basal array) and 12 to 22

(apical array). The arrow shows the distinction mark on the apical array. If the

electrode arrays are interchanged or if a different surgical approach has been

used, programming the speech processor will be more difﬁcult as the tonotopic

order of channels will no longer follow the order of the standard Nucleus 24

cochlear implant. Without correction this will lead to a wrong electrode-to-

channel allocation in the speech processor’s MAP. This is particularly important

when programming children who cannot give reliable responses. Note: With

a standard insertion, the basal electrode array will be in the basal turn of the

cochlea and the apical array will be in the apical turn of the cochlea.

Figure 12 : The

Nucleus 24 Double

Array

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