An assembly for the stabilisation of vertebral bodies of the...

A - Human Necessities – 61 – B

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A61B 17/70 (2006.01)

Patent

CA 2450933

An assembly for the stabilisation of vertebral bodies (12, 14) of the spine is described. It comprises a pair of pedicle screws (20) each having a threaded shaft (20a) with a tapering first end (20b) for introduction into a vertebral body and a head portion (20c) with a second end (20d), and is characterised in that it further comprises a spring member (18, 22, 24, 40, 42, 44) of the following form. The spring member has first and second ends, substantially straight portions (18b) adjacent each end and a substantially curvilinear central portion (18a) therebetween, the straight portions and the substantially curvilinear central portion being substantially coplanar. The assembly also includes a pair of fixation mechanisms (26) for securing the first and second ends of the spring member to the pair of pedicle screws. Typically the assembly will be for stabilisation of two adjacent vertebral bodies of the spine, that is one motion segment.

L'invention concerne un ensemble permettant de stabiliser des corps vertébraux de la colonne vertébrale. Cet ensemble comprend une paire de vis pédiculaires, chacune d'elles étant constituée d'un arbre fileté doté d'une première extrémité conique destinée à être introduite dans un corps vertébral et d'une partie tête dotée d'une seconde extrémité, ledit ensemble étant caractérisé en ce qu'il comprend également un élément de ressort présentant la forme décrite ci-après. Le dit élément de ressort comprend une première et une seconde extrémités, des parties sensiblement droites adjacentes à chaque extrémité, et une partie centrale sensiblement curvilinéaire disposée entre lesdites parties droites, ces parois et la partie centrale sensiblement curvilinéaire étant sensiblement coplanaires. L'ensemble comprend également une paire de mécanismes de fixation permettant de fixer les première et seconde extrémités de l'élément de ressort à la paire de vis pédiculaires. Cet ensemble est généralement utilisé pour stabiliser deux corps vertébraux adjacents de la colonne vertébrale constituant un segment de mouvement.

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