Telescopic array for a cochlear implant
A cochlear implant device that has an elongate member with electrode(s) supported thereon. The elongate member comprises a first portion that is insertable into the implantee and at least one second portion wherein, on or following insertion of the first portion, the second portion is at least partially supported by the first portion. During or after insertion of the first portion, the second portion is movable relative to the first portion.
1. A cochlear implant device comprising an elongate member having:
a first portion having a proximal end, a distal end, and at least one electrode supported thereon, the first portion being insertable into the cochlea of an implantee; and
at least one second portion having a proximal end, a distal end, and at least one electrode supported thereon;
wherein, on or following insertion of the first portion into the implantee, the second portion is positionable through and supported by the first portion;
and further wherein, during or after insertion of the first portion, the second portion is still further movable relative to the first portion such that the distal end of the second portion is moved away from the proximal end of the first portion.
2. The cochlear implant device of claim 1 wherein the first portion of the elongate member is supported by the wall of the cochlea of the implantee.
3. The cochlear implant device of claim 1 wherein the first portion of the elongate member is substantially straight.
4. The cochlear implant device of claim 1 wherein the first portion of the elongate member comprises a substantially tubular member.
5. The cochlear implant device of claim 4 wherein the diameter of the tubular first portion decreases at least adjacent its distal end and wherein the diameter of the second portion increases at a predetermined location spaced from the distal end of the second portion to thereby provide a region of frictional engagement between said first and second portions of the elongate member as the distal end of the second portion is moved relatively away from the proximal end of the tubular first portion.
6. The cochlear implant device of claim 1 wherein the shape or configuration of the first portion of the elongate member does not substantially change on or following insertion of said first portion.
7. The cochlear implant device of claim 1 wherein the second portion of the elongate member is preformed such that at least a region thereof extending back from the distal end adopts a different configuration to that of the first portion during or after insertion of the first portion of the elongate member.
8. The cochlear implant device of claim 7 wherein said at least a region of the second portion adopts a curved configuration during or after insertion of the first portion of the elongate member.
9. The cochlear implant device of claim 1 wherein the second portion of the elongate member has a channel or reservoir for the delivery of at least one bioactive substance to the cochlea.
10. The cochlear implant device of claim 1 wherein more than one electrode is provided on both the first portion and the second portion of the elongate member.
11. The cochlear implant device of claim 10 wherein the alignment of the electrodes on the second portion substantially matches that of the electrodes on the first portion.