Cochlear implant electrode and method of making same

A - Human Necessities – 61 – N

Patent

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A61N 1/05 (2006.01) A61N 1/36 (2006.01)

Patent

CA 2498266

A cochlear stimulation lead (150) having a pre-curved electrode array (70) is provided. The molding process provides memory to the curved part of the lead (71). The lead may be made having a stylet insertion channel (40) that extends from a slightly curved or substantially straight section (30) and into the highly curved section (71) of the lead (150). Because high compliance is desired for the lead in cochlear stimulation applications, the compliance is controlled not only by the taper at the distal end (72) of the lead (150) and overall lead thickness, but also by choosing the material hardness of the lead carrier/covering (60) and employing compliant zigzagged conductor wire (202). In addition, differential lead compliance/stiffness can be achieved by using a stiff tubing (41) that forms part of the stylet insertion channel (40).

La présente invention concerne un fil de stimulation cochléaire (150) qui présente un ensemble d'électrode préincurvé (70). Le procédé de moulage confère une mémoire à la partie incurvée du fil (71). Ce fil peut être pourvu d'un canal d'insertion de stylet (40) qui s'étend d'une section légèrement incurvée ou sensiblement droite (30) jusque dans la section très incurvée (71) du fil (150). Puisqu'il est souhaitable que le fil présente une grande élasticité dans le cadre d'applications de stimulation cochléaire, cette élasticité est non seulement contrôlée par le cône à l'extrémité distale (72) du fil (150) et sur toute l'épaisseur du fil, mais également par le choix de la dureté du matériau du support/revêtement (60) du fil et l'emploi d'un fil conducteur en zigzag élastique (202). De plus, on peut obtenir une élasticité/rigidité de fil différentielle en utilisant un tube rigide (41) qui fait partie du canal d'insertion de stylet (40).

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