Polyaxial orthopedic fastening apparatus

A - Human Necessities – 61 – F

Patent

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Details

A61F 2/44 (2006.01)

Patent

CA 2598896

An apparatus is designed to attach an implant to bone in a manner that permits rotational adjustment of the implant about multiple axes prior to securement via the apparatus. The apparatus may include separate rotational and translational fasteners that can be individually locked to independently restrict rotation and translation of the implant relative to the bone. The rotational fastener includes an interpositional member, an expandable engagement member, and a rotational locking member that urges the expandable engagement member to advance along the interpositional member. The resulting expansion of the engagement member causes it to engage the implant. The rotational fastener is slidable along a fixation member implanted in the bone until the translational fastener is applied to restrict relative translation between the rotational fastener and the bone.

La présente invention concerne un dispositif conçu pour fixer un implant à un os de façon à permettre le réglage en rotation de l'implant autour d'axes multiples, pour permettre le maintien au moyen du dispositif. Le dispositif comprend des éléments de fixation à rotation et à translation séparés qui peuvent être verrouillés individuellement, pour limiter indépendamment la rotation ou la translation de l'implant par rapport à l'os. L'élément de fixation à rotation comprend un élément d'interposition, un élément d'encliquetage extensible, et un élément de verrouillage de rotation qui agit sur l'élément d'encliquetage extensible pour le faire avancer le long de l'élément d'interposition. L'expansion résultante de l'élément d'encliquetage provoque son encliquetage avec l'implant. L'élément de fixation à rotation peut coulisser le long d'un élément d'immobilisation implanté dans l'os, jusqu'à ce que l'élément de fixation à translation se trouve appliqué pour limiter la translation relative entre l'élément de fixation à rotation et l'os.

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