Patent ID: 6811552
Filing Date: 2004-11-02
Classification: A61B

Abstract:
Device for securing bits of bone together, particularly including small-sized bits of bone, for example bits of metatarsal head, characterized in that it is in the form of comprising:a spindle having an longitudinal axis and comprising an elongate shank (1) with a weakened region (2), the weakened region configured to allow the elongate shank to be broken, a fixator element (3) following the weakened region, the fixator element having a frustonconical surface extending frustoconically so that the fixator element reduces in diameter in a direction of a free anterior end (4) of the fixator element, and, a screw thread on the frustoconical surface, the screw thread having a pitch decreasing progressively from said anterior end and, bottoms formed by said frustoconical surface, crests which lie inside a geometric cylinder (D) coaxial with the axis of the spindle, said anterior end (4) being beveled and forming a drilling end, so as to allow said anterior end to be screwed into the bits of bone, wherein a posterior part of the fixator element (3) extending toward the weakened region (2) has longitudinal grooves (15) partially interrupting the threads in the weakened region, so as to allow the introduction of corresponding fingers of a tool that allows the fixator element to be unscrewed by turning the fixator element in an opposite direction to a direction in which the fixator element is turned for self-tapping.