Ring for an angulation osteosynthesis device and osteosynthesis device incorporating same
AssigneeStryker France
InventorChristian Baccelli
Life of this patent
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Abstract
An osteosynthesis device, in particular for the spine. The device has an outer spherical surface and a substantially cylindrical inner surface, designed to receive a rod of the device. A ring has two matching parts (10) each being U-shaped and having a bottom and a pair of branches taking up a fraction of the axial dimension of the bottom. The distance between the branches is about the same as that of the rod diameter, their respective bottoms facing each other enclosing the rod, and their pairs of branches adjacent. The parts jointly define the outer and inner surfaces. The invention is applicable to linkages adjustable at different angles.
Claims9
Angular orientation ring for an osteosynthesis device, for a spine, of a type comprising an essentially spherical outer face and an essentially cylindrical inner face intended to take a rod (21) of the device, wherein the ring has two mating parts (10), each part being substantially U-shaped with a bottom (11) and at least one pair of branches (12a, 12b) occupying a fraction of an axial dimension of said bottom, a distance (L) between the said pair of branches being close to the diameter of said rod intended to take the ring, and the two parts being designed to be inserted over the rod in a transverse direction in such a way that their respective bottoms substantially face each other across said enclosed rod, and such that their pairs of branches are side by side, said two parts jointly defining said essentially spherical outer face and said essentially cylindrical inner face.
Osteosynthesis device, for the spine, comprising a bone fixation part which has an essentially spherical seat, a ring housed in said seat, an element for clamping the ring into its seat, and a rod (21) passing through an essentially cylindrical passage formed in the ring, wherein the rod forms part of an element (20) comprising, at the two ends of the rod, two parts (22, 23) which constitute an obstacle to the slipping of a one -piece ring over the rod, and the two parts (10) are fitted onto the rod from the side thereof.
Dependencies are inferred from the claim text.