A - Human Necessities – 61 – B
Patent
A - Human Necessities
61
B
A61B 17/80 (2006.01) A61B 17/72 (2006.01) A61B 17/17 (2006.01)
Patent
CA 2487571
A fixation system (10) includes a device having a nail portion (12) and a plate portion (14), preferably horizontally and vertically offset relative to the nail portion by a neck portion (16). The nail portion (12) includes preferably threaded screw holes (24, 26), and the plate portion (14) includes longitudinally displaced peg holes (50, 52, 54), each of which is adapted to orient a peg (56, 58, 60) in a different orientation from the others. The system (10) also includes unicortical screws (28) having a reasonably large head (36) adapted to seat against the outer surface of the bone and a threaded shaft (32) adapted to engage in the screw holes (24, 26), and pegs (56, 58, 60) adapted to engage in the peg holes (50, 52, 54). Where threaded screw holes (24, 26) are used, bone is clamped between the nail portion (12) and the head (36) of the unicortical screws (28, 30). The pegs (56, 58, 60) provide stabilization and support for subchondral fragments. Moreover, as the pegs (56, 58, 60) preferably enter the subchondral fragments from a plurality of directions, additional fixation of the device (10) into the bone is provided.
L'invention porte sur un système (10) de fixation comprenant un dispositif présentant une tige effilée (12) et une plaque (14), de préférence verticale et décalée par rapport à la tige, à laquelle elle est reliée par un col. La tige comporte de préférence des trous filetés (24, 26) et la plaque, des trous de cheville (50, 52, 54) présentant chacun une orientation différente. Le système (10) comprend également des vis transcorticales (28) à tête large (36) prenant appui sur la surface extérieure de l'os, un axe fileté (32) s'engageant dans les trous filetés (24, 26), et des chevilles (56, 58, 60) s'engageant dans les trous de cheville (50, 52, 54). Les trous filetés (24, 26), permettent de serrer l'os entre la tige (12) et la tête des vis transcorticales (28), tandis que les chevilles (56, 58, 60) assurent la stabilisation et le maintien des fragments sous-chondraux. De plus, les chevilles (56, 58, 60) qui pénètrent dans les fragments sous-chondraux dans des directions différentes renforcent la fixation du dispositif (10) dans l'os.
Castaneda Javier
Orbay Jorge L.
Depuy Products Inc.
Hand Innovations Llc
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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