Methods and apparatuses for promoting fusion of vertebrae

A - Human Necessities – 61 – B

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A61B 17/80 (2006.01) A61B 17/70 (2006.01)

Patent

CA 2477152

Methods and apparatuses for promoting fusion of vertebrae are provided. The apparatuses comprise interconnecting plates (12, 14) that fixate vertebrae to each other and provide for a predetermined amount of subsidence where the fusion occurs. Allowing for this predetermined amount of subsidence increases bone-to-bone contact at the graft, which promotes fusion without having excessive settling of the two vertebrae onto the graft. The predetermined amount of subsidence is achieved by the placement of a plate spacer (100) between each of two interconnecting plates when the plates are attached to the vertebrae. The plate spacer has a height equal to the maximum amount of subsidence desired. After affixing the plates to the vertebrae, the plate spacer is removed, leaving a space between the plates, which allows the vertebrae to subside by a distance equal to the height of the plate spacer.

L'invention concerne des méthodes et des dispositifs destinés à favoriser la fusion de vertèbres. Ces dispositifs comprennent des plaques d'interconnexion (12, 14) fixant les vertèbres l'une à l'autre et permettant de conserver un degré prédéterminé d'affaissement lorsque la fusion se produit. Ce degré prédéterminé d'affaissement permet d'augmenter le contact os à os au niveau du greffon, ce qui favorise la fusion sans tassement excessif des deux vertèbres sur le greffon. On obtient ce degré prédéterminé d'affaissement par mise en place d'une pièce d'espacement des plaques (100) entre chacune des deux plaques d'interconnexion lorsque lesdites plaques sont fixées aux vertèbres. Cette pièce d'espacement des plaques présente une hauteur égale au degré d'affaissement maximal souhaité. Après la fixation des plaques aux vertèbres, la pièce d'espacement des plaques est retirée, un espace étant ainsi formé entre les plaques, ce qui permet aux vertèbres de s'affaisser selon une distance égale à la hauteur de la pièce d'espacement des plaques.

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