Distraction pin for fracture fixation

Details Distraction pin for fracture fixation Distraction pin for fracture fixation

A - Human Necessities

61

B

A61B 17/56 (2006.01) A61B 17/16 (2006.01) A61B 17/86 (2006.01) A61B 17/88 (2006.01) A61B 17/00 (2006.01) A61B 19/00 (2006.01)

Patent

CA 2476388

An internal fixation pin (10) comprises first (12) and second portions (14) with threads of different diameters, but having the same pitch and thread depth. The first portion (12) includes a self-tapping tip (20). No enlarged head portion is provided to the pin at the end opposite the tip. A non- threaded shaft portion (26) is frangibly connected to the second portion (14) and is a mechanism for rotating the pin for threaded insertion into bone. A plurality of circumferentially spaced-apart longitudinal grooves (30) are provided on the second portion (14) adjacent its intersection with the shaft portion (26). After insertion of the first (12) and second portions (14) across a fracture, the shaft portion (26) is removed. The grooves (30) permit rotation of the pin for removal should removal be necessary. A driver (40) for pin removal is also provided, as well as a mill tool (60).

L'invention concerne une broche de fixation interne (10) comprenant une premi­re (12) et une deuxi­me parties (14) filet~es de diff~rents diam­tres, mais ~ profondeur et pas de vis identiques. La premi­re partie (12) comporte une pointe autotaraudeuse (20). La broche n'est pas dot~e d'une tÚte ~largie ~ l'extr~mit~ oppos~e de la pointe. Une partie tige (26) non filet~e, reli~e de mani­re frangible ~ la deuxi­me partie (14), sert ~ faire tourner la broche pour la visser dans un os. Une pluralit~ de rainures (30) longitudinales sont r~parties de fa×on espac~e sur la circonf~rence de la deuxi­me partie (14) adjacente ~ son intersection avec la partie tige (26). La premi­re (12) et la deuxi­me parties (14) ~tant ins~r~es dans une fracture, la partie tige (26) est enlev~e. Les rainures (30) permettent de tourner la broche pour l'enlever, si son extraction est n~cessaire. La pr~sente invention porte ~galement sur un dispositif d'entra¹nement (40) pour extraire la broche et sur un outil de fraisage (60).

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