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1. (WO2015123159) ELECTRODE WITH ANTI-SPRING BACK COMPONENT

Pub. No.:    WO/2015/123159    International Application No.:    PCT/US2015/015105
Publication Date: Fri Aug 21 01:59:59 CEST 2015 International Filing Date: Wed Feb 11 00:59:59 CET 2015
IPC: A61N 1/05
Applicants: MED-EL ELEKTROMEDIZINISCHE GERAETE GMBH
Inventors: HAGR, Abdulrahman Abdullah
DHANASINGH, Anandhan
JOLLY, Claude
HESSLER, Roland
Title: ELECTRODE WITH ANTI-SPRING BACK COMPONENT
Abstract:
An implantable electrode arrangement for a cochlear implant system is described that prevents post-surgical retraction of the electrode. The arrangement includes at least one retraction limiter having an extracochlear portion located at a distal end of the extracochlear electrode lead and an intracochlear portion located at a proximal end of the intracochlear electrode array and made at least in part of a swellable material that expands in response to fluid contact. The intracochlear portion of the retraction limiter is adapted for deformation away from an outer surface of the array proximal end in response to exposure of the swellable material to perilymph fluid within the cochlea after surgical insertion of the electrode array into the implanted cochlea so as to form an anti-retraction projection preventing post-surgical retraction of the array proximal end back through the electrode opening in the outer surface of the implanted cochlea.