Orthopedic compression screw

Details Orthopedic compression screw Orthopedic compression screw

A - Human Necessities

61

B

A61B 17/86 (2006.01)

Patent

CA 2736775

A cannulated compression screw has a threaded distal end with a tip that includes one or more flutes to allow the screw to be self- tapping Optionally, the screw also includes one to four reverse cutting flutes proximal to the insertion tip. The distal threads are cancellous threads having a minor diameter and a major diameter and a constant thread pitch. An intermediate portion of the screw is non-threaded and the proximal end includes a compression wedge or taper that has one to five flutes that terminate before the top of the screw.The proximal end further includes a radiused bevel to the terminal surface that includes a hexagonal torque driving recess. The diameter of the non-threaded shaft section is constant distal from the compression wedge to the distal tip where it defines the minor diameter of the threaded portion. The screw optionally includes a tapered insertion tip.

L'invention porte sur une vis de compression cannelée qui comporte une extrémité distale filetée avec une pointe qui comprend une ou plusieurs cannelures permettant à la vis d'être autotaraudeuse. En option, la vis comprend également une ou quatre cannelures à découpe inversée proches de lextrémité d'introduction. Les filets distaux sont des filets perforés ayant un diamètre inférieur et un diamètre supérieur et un pas de filetage constant. La partie intermédiaire de la vis est non filetée et l'extrémité proximale comprend un coin ou un cône de compression qui comporte une à cinq cannelures qui se terminent avant la partie supérieure de la vis. L'extrémité proximale comprend en outre un biseau arrondi vers la surface terminale, qui comprend une cavité hexagonale d'entraînement de couple. Le diamètre de la section de tige non filetée est constant du coin de compression à lextrémité distale où il définit le diamètre inférieur de la partie filetée. La vis comprend facultativement un embout d'introduction fileté.

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