SURGICAL ORIENTATION SYSTEM USING BONE GEOMETRY FOR REPEATABLE POSITIONING

摘要

The invention relates to an ancillary (20) surgical, preferably Y, comprising three contact portions (21, 22, 23) intended to come into contact with three corresponding reference areas of an operating area, and a determination means ( 24) of a reference frame of the ancillary in a Galilean orientation reference system. At least one of the first and second contact portions, preferably both, has a concave or convex end, for example a possibly rotatably mounted roller, or a gutter-shaped element. Each end comes into contact with two reference points in the corresponding reference area which is convex or concave respectively. These two points guide precisely the rotation of the ancillary to make contact with the third contact portion with the third reference zone. The orientations of the ancillary define the reference frame of orientation, whose determination is thus reproducible with precision.