Targeting system for the guided insertion of a guide wire or a bone screw
A targeting system ( 1 ) for the guided insertion of a guide wire ( 50 ) or a bone screw comprising: a stabilization body ( 2 ) fixed to the bone by means of stabilization screws ( 3 ); a guide sleeve ( 4 ) adapted to receive a guide cannula ( 5 ) for the insertion of the guide wire ( 50 ) or bone screw; articulated connection means ( 6 ) adapted to connect the stabilization body ( 2 ) to the guide sleeve ( 4 ) and allow the relative spatial position of the guide sleeve ( 4 ) to be varied with respect to the stabilization body ( 2 ).
1. A targeting system for guided insertion of a guide wire or a bone screw comprising:
a stabilization body which can be fixed to bone by means of stabilization screws;
a guide sleeve adapted to receive a guide cannula for insertion of said guide wire or bone screw so that said guide cannula is able to translate along a sleeve axis of said guide sleeve while inserted within said guide sleeve;
an articulated connector adapted to connect said stabilization body to said guide sleeve and allow a relative spatial position of said guide sleeve to be varied with respect to said stabilizadon body;
wherein said articulated connector allows at least a relative translation along an axis that is orthogonal to said sleeve axis of said guide sleeve, and
wherein said stabilization body has, at each of a first and second end, an insertion hole for insertion of a stabilization screw and a locking device for locking said stabilization screw within said insertion hole; said insertion hole being a through hole having an insertion hole axis; said locking device comprises a locking element and a through locking hole having a locking hole axis orthogonal to said insertion hole axis and partially confluent into said insertion hole; said locking element comprising at least one bar adapted to be coaxially introduced into said locking hole; said bar comprising a flattening lying on a plane parallel to said locking hole axis when said bar is inserted into said locking hole; said locking device has a screw locking configuration and a screw sliding configuration; in the screw sliding configuration, said bar is inserted into said locking hole with said flattening parallel to said insertion hole axis and facing said stabilization screw in such a way that said stabilization screw is freely slidable within said insertion hole; in the screw locking configuration, said bar is in a rotated position with respect to the screw sliding configuration and interfering with said stabilization screw which is thereby locked within said insertion hole.
2. The targeting system according to claim 1 , wherein said stabilization body comprises a telescopic structure adapted to vary a distance and a relative orientation between said stabilization screws inserted into said insertion holes.
3. The targeting system according to claim 2 , wherein said telescopic structure comprises a tubular guide element integral with one of said first and second ends and a cylindrical element integral with the other of said first and second ends; said cylindrical element being at least partially coaxially inserted into said tubular guide element; said cylindrical element being free to slide and rotate about its own axis while at least partially inserted within said tubular guide element, approaching/moving away and/or rotating said stabilization screws with respect to each other.
4. The targeting system according to claim 3 , wherein said cylindrical element has an insertion end adapted to be press-fitted into an entrance of said tubular guide element; said entrance having a projection of an inner wall which determines a local reduction of an inner diameter; said insertion end comprising a shoulder which determines a localized extension of a diameter of said cylindrical element; said shoulder being arranged to be located in abutment against said projection in order to prevent a decoupling of said cylindrical element from said tubular guide element.