Surgical instrument for a technique for attaching bone fragments using a cannulated screw

摘要

The present invention relates to a surgical instrument for a technique for attaching bone fragments using a cannulated screw, the implantation of which is guided by a pin. The instrument (1) comprises: (i) a central channel (5) defining a longitudinal axis (6), enabling the slidable and rotatable insertion of said instrument (1) onto said guide pin; (ii) a nesting structure (15) suitable for being inserted into a recess made in the head of said cannulated screw and for blocking the rotation thereof; (iii) cutting edges (20, 21) suitable for boring at least one of said bone fragments by rotating said surgical instrument (1) about said longitudinal axis (6); and (iv) a means (11) for gauging the insertion depth of said guide pin in said bone fragments. Said instrument (1), which is conveniently inserted onto said guide pin and rotatably moved, enables either the boring of at least one of the bone fragments by means of said cutting edges (20, 21), or the screwing of said cannulated screw, inserted onto said guide pin, by engaging with said nesting structure (15).

主权项

1. A surgical instrument for fixation of bone fragments by a cannulated screw whose implantation is guided by a guiding pin,
wherein said surgical instrument has an elongated cannulated body comprising: a central channel defining a longitudinal axis, the central channel being adapted to slidably and rotatably engage said instrument on said guiding pin, and a nesting structure adapted to be inserted in an accommodation provided in a head of said cannulated screw, so as to lock the surgical instrument and the cannulated screw in rotation, wherein said elongated cannulated body comprises:
cutting edges adapted to bore at least one of said bone fragments by rotating said surgical instrument about said longitudinal axis, anda depth gauge part adapted to gauge a depth of penetration of said guiding pin into said bone fragments,so that said surgical instrument, when engaged on said guiding pin and rotated, performs at least one of (i) boring of at least one of said bone fragments by action of said cutting edges, and (ii) screwing of said cannulated screw, engaged on said guiding pin, by cooperation with said nesting structure.