Bone alignment system having variable orientation bone anchors

A - Human Necessities – 61 – B

Patent

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Details

A61B 17/56 (2006.01) A61B 17/58 (2006.01) A61B 17/70 (2006.01) A61F 2/30 (2006.01)

Patent

CA 2346400

A bone alignment assembly (20) is disclosed having bone anchor subassemblies (26) for securing to both bones (32), and a bone position retainer (24), wherein the bone position retainer (24) includes a longitudinal member (24a) for maintaining a desired alignment of the bones (32) when the bone anchor assemblies (20) are secured to the bone position retainer (24). Each of the bone anchor subassemblies (26) includes a shaft (36), and one or more pairs of components (e.g., washers (68, 94)) wherein the components of each pair have mating spherical concave (72), and convex (68) surfaces that can mate together in a plurality of angular positions. When the shaft (36) extends through each of the pairs of mating components (68, 94), and also through a passageway (28) of the bone position retainer (24) that is sandwiched between the two pairs of mating components (68, 94), the shaft (38) can be secured at any one of a plurality of orientations relative to the bone position retainer (24).

L'invention concerne un ensemble d'alignement osseux (20) comportant des sous-ensembles d'ancrage osseux (26) conçus pour être fixés à deux os (32), et un dispositif (24) qui permet de maintenir les os en place et comprend un élément longitudinal (24a) conçu pour maintenir un alignement souhaité entre les os (32) lorsque les ensembles d'ancrage osseux (20) sont fixés au dispositif de maintien des os (24). Chacun des sous-ensembles d'ancrage osseux (26) comprend une tige (36), et une ou plusieurs paires de composants (par exemple, des rondelles (68)(94)) qui présentent des surfaces sphériques d'accouplement, concave (72) et convexe (98), susceptibles de s'accoupler l'une à l'autre suivant une pluralité de positions angulaires. Lorsque la tige (36) est disposée en travers de chacune des paires de composants d'accouplement (68)(94), et qu'elle traverse également un passage (28) du dispositif de maintien des os (24) qui est pris en sandwich entre les deux paires de composants d'accouplement (68)(94), il est possible de fixer ladite tige (38) suivant une orientation quelconque par rapport au dispositif de maintien des os (24).

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