Fiducial matching by means of fiducial screws

A - Human Necessities – 61 – B

Patent

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Details

A61B 19/00 (2006.01) A61B 6/12 (2006.01)

Patent

CA 2335867

The invention relates to a device for the referenced positioning of two reference points (11; 14) situated on a fiducial screw (2) implanted into a bone. Said device comprises (A) a fiducial screw (2) which can be screwed into a bone (1) and has a longitudinal axis (9), a screw shank (10) and a screw head (22) provided with means (12) for receiving an instrument used to screw the fiducial screw (2) in and out; and B) a pointer (3) provided with at least three means (19) which are not positioned colinearly and emit electromagnetic or acoustic waves, where said pointer (3) has a front end (15), a rear end (16) and a longitudinal axis (9). C) The pointer (3) has means (20) at its front end (15) and the fiducial screw (2) at its head (22) which make it possible for the pointer (3) and the fiducial screw (2) to be joined in the direction of the longitudinal axis (9) and concentrically in relation to said axis (9). D) thanks to the known length (x) of the fiducial screw (2), the known length (y) of the pointer (3) and the means (20) described under C) it is possible to achieve a defined, local coordination between the reference points (11; 14) on the fiducial screw (2) and the means (19) of the pointer (3) emitting electromagnetic or acoustic waves.

L'invention concerne un dispositif de positionnement précis de deux points de référence (11; 14) situés sur une vis de repère (2) qui est implantée dans un os. Ce dispositif comprend A) une vis de repère (2) vissée dans l'os et dotée d'un axe longitudinal (9), d'une tige (10) et d'une tête (22), laquelle est pourvue de moyens (12) destinés à recevoir un instrument servant à visser et dévisser la vis de repère (2). Ce dispositif comprend également B) un pointeur (3) doté au moins de trois moyens (19) qui sont disposés de façon non colinéaire et qui délivrent des ondes électromagnétiques ou acoustiques, ce pointeur (3) comprenant une extrémité avant (15), une extrémité arrière (16) et un axe longitudinal (9). C) Le pointeur (3) est doté, à son extrémité avant (15), et la vis de repère (2), au niveau de sa tête (22), de moyens (20) qui permettent d'assembler le pointeur (3) et la vis de repère (2) dans le sens de l'axe longitudinal (9) et de façon concentrique par rapport à cet axe longitudinal (9). D) A partir de la longueur connue (x) de la vis de repère (2), de la longueur (y) connue du pointeur (3) et des moyens définis en C), on peut établir une relation locale définie entre les points de référence (11; 14) de la vis de repère (2) et les moyens (19) du pointeur (3) qui délivrent les ondes électromagnétiques ou acoustiques.

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