Importance

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Abstract

A bone stabilizing system including an improved guide pin consisting of an elongate solid shaft having one or more drilling teeth and self-tapping threads at a first end and a cross-section partially defined by a non-circular circumference. The system also includes a fixation device which comprises a metal cannula defined by a hollow cylindrical shaft having a drilling teeth at one end, an operating tool receiving means at the other end and a plurality of threads therebetween. The drilling teeth each having cutting surfaces positioned obliquely with first and second directions in a diametric plane extending axially through the cannula. The receiving portion is configured to accept an operating tool to rotatingly advance or withdraw the cannula within the fractured bone. The threads are configured with a non-circular circumference while a portion of the threads are tapered. Intersecting a portion of the threads is at least one flute which is defined by two substantially orthogonal surfaces and an elongate slot which penetrates the wall of the cannula so as to provide fluid communication between the flute and the interior hollow portion of the cannula. A transition zone is provided between the drilling portion and the beginning of the threads. The guide pin is provided with a non-circular surface which, together which the interior hollow portion of the cannula, define a pathway through which bone chips may easily pass.

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First Claim