Orthopaedic bone screw apparatus

Details Orthopaedic bone screw apparatus Orthopaedic bone screw apparatus

A - Human Necessities

61

B

A61B 17/86 (2006.01) A61B 19/00 (2006.01)

Patent

CA 2339718

A bone screw apparatus and method of implantation provides a bone screw having an elongated shaft of an oversized length with proximal and distal end portions. The distal end portion of the shaft has a cutting head. The proximal end portion of the shaft is sized and shaped to accept a driver tool, such as a drill chuck. The shaft is externally threaded along a majority of its length. A pair of opposed longitudinally extending circumferentially spaced flat surfaces are provided along the shaft. A removable head with a central opening enables the head to slide along the shaft proximally to distally. A ratcheting mechanism may prevent movement of the head along the shaft in but one direction. A central opening of the head is shaped to conform to the shaped surfaces of the shaft, so that the head and shaft can be rotated as a unit by engaging and rotating the head. The tool receptive surface portion of the head includes intersecting external surfaces of the head spaced radially away from the shaft during use.

L'invention porte sur un système de vis orthopédique s'implantant dans l'os, et sur son procédé d'implantation. Le système consiste en une vis très allongée dont l'extrémité distale comporte une pointe coupante, et dont l'extrémité proximale est conçue pour recevoir le mandrin d'une perceuse. La tige de la vis, filetée sur la majeure partie de sa longueur, présente deux méplats latéraux en opposition de part et d'autre de la circonférence et s'étendant longitudinalement. Une tête amovible percée d'une ouverture centrale peut coulisser le long de la tige d'une extrémité à l'autre. Un cliquet limite le coulissement de la tête à un seul sens. La forme de l'ouverture centrale de la tête est le pendant de celle de la section transversale de la tige, ce qui les rend solidaires en rotation. La portion de la surface de la tête recevant l'outil comporte des surfaces extérieures se coupant, qui s'écartent radialement de la tige pendant l'utilisation.

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