Electrode with anti-spring back component
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United States of America Patent
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Mar 29, 2016
Grant Date -
Aug 13, 2015
app pub date -
Feb 10, 2015
filing date -
Feb 11, 2014
priority date (Note) -
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status (Latency Note)
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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.
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