Pedicle screw systems and methods

A - Human Necessities – 61 – B

Patent

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Details

A61B 17/70 (2006.01) A61B 17/58 (2006.01)

Patent

CA 2585447

The pedicle screw system may be used for fixation of spinal segments and may be advantageous when minimally invasive surgery (MIS) techniques are employed. The pedicle screw system includes a tulip assembly comprising of a tulip body, a inner member, and an expansion member. Installation of the pedicle screw system into pedicles of the spine, for example, includes inserting the pedicle screw into a portion of the spine and then coupling the tulip assembly to the pedicle screw. The tulip assembly may be locked onto the pedicle screw before a distraction rod is placed in the tulip assembly. After the rod is placed in the tulip assembly, the tulip body and the inner member can be rotated relative to one another to lock the rod into the tulip assembly. In addition, the relative rotation may also provide additional locking of the tulip assembly to the pedicle screw.

L'invention concerne un système de vissage pédiculaire pouvant servir à fixer des segments spinaux, et pouvant s'avérer avantageux lorsque des techniques de chirurgie invasive minimale (MIS) sont employées. Ce système de vissage pédiculaire comprend un ensemble tulipe comportant un corps de tulipe, un élément interne, et un élément d'extension. L'installation de ce système de vissage pédiculaire dans des pédicules de la colonne vertébrale consiste par exemple : à insérer la vis pédiculaire dans une partie de la colonne vertébrale, puis ; à accoupler l'ensemble tulipe et la vis pédiculaire. L'ensemble tulipe peut être bloqué sur la vis pédiculaire avant qu'une barre de détraction soit placée dans l'ensemble tulipe. Une fois ladite barre placée dans l'ensemble tulipe, le corps de tulipe et l'élément interne peuvent tourner l'un par rapport à l'autre, pour bloquer la barre sur l'ensemble tulipe. En outre, le mouvement de rotation relatif peut bloquer davantage l'ensemble tulipe sur la vis pédiculaire.

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