Safer more x-ray transparent spinal implant

A - Human Necessities – 61 – B

Patent

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Details

A61B 17/56 (2006.01) A61F 2/44 (2006.01) A61F 2/46 (2006.01) A61B 17/88 (2006.01) A61F 2/00 (2006.01) A61F 2/28 (2006.01) A61F 2/30 (2006.01)

Patent

CA 2346110

A spine-stabilization implant (30) comprises a one-piece bullet shaped shell with bone tapping screw threads (32) on its outside surface. the screw threads are longitudinally interrupted by several end to end flutes (34) distributed in parallel around the circumference. Bone growth access windows are (36) provided at several locations through the flutes. Such construction gives the spine stabilization implant a hexagonal cross section with a hollow central core (38). A drive tool can be slipped into the back end. After spreading two adjacent vertebrae as much as the interconnecting tissues will allow, a bore is made by a surgeon during an operation into the intervertebral space of a patient's spine, e.g., deep into, the disc. The drive tool is then used to push the spine stabilization implant down the bore, and into the intervertebral space. The tool is then twisted such that the bone tapping screw threads cut into, and lock onto the opposite surfaces of the adjacent vertebrae. The tool is then withdrawn. Morsel bone is packed into the spine stabilization implant to promote new bone growth that will fuse together the opposite surfaces of the adjacent vertebrae.

La présente invention concerne un implant de stabilisation vertébrale (30) comprenant une enveloppe monobloc de forme fuselée dont la surface extérieure porte des filetsaraudeurs pour os (32). Ces filets sont interrompus dans le sens de la longueur par plusieurs cannelures continues (34) disposées parallèlement à la périphérie. Ces cannelures présentent en plusieurs points des fenêtres d'accès (36) pour croissance osseuse. L'implant de stabilisation vertébrale présente une section hexagonale avec une âme centrale creuse (38). Un outil de mise en place peut être introduit dans l'extrémité arrière. Après avoir écarté deux vertèbres adjacentes autant que les tissus de liaison l'autorisent, on procède pendant une intervention chirurgicale sur l'espace intervertébral au perçage d'un trou dans la profondeur du disque. L'outil sert à repousser l'implant de stabilisation vertébrale dans le trou et dans l'espace intervertébral. On visse ensuite l'outil pour que les filets taraudeurs percent un trou dans les surfaces opposées des vertèbres adjacentes. Après retrait de l'outil, on remplit l'implant de stabilisation vertébrale de petits morceaux d'os pour favoriser une nouvelle croissance osseuse qui fera se souder les surfaces opposées de vertèbres adjacentes.

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