Spine Surgical Treatment System In order to improve the placement of pedicle screws in a patient's spine vertebrae, this surgical treatment system (1) includes a drill bit (10), which extends along a drill bit axis ( X10) proximo-distal and which is suitable for drilling a hole in the pedicle of a vertebra when the drill bit is rotated. The drill bit includes, successively along the drill bit axis, a distal end (11), a cylindrical drill (12), centered on the drill bit axis and provided to give a cylinder shape to a distal end part of the hole, and a bur (13) adapted to give a proximal end part of the hole a funnel shape gradually flaring from the distal end part of the hole. The system also includes a pedicle screw (20), which extends along a proximo-distal screw axis (X20) and which is suitable for, after the drill bit has drilled the hole and has been removed from this hole, to be screwed. in the hole by being rotated therein. The pedicle screw includes a threaded rod (21) which has a cylindrical shape, centered on the screw axis and whose nominal diameter (D21) is greater than the diameter (D12) of the drill. Figure for abstract: figure 1 Système de traitement chirurgical du rachis Afin d’améliorer le placement de vis pédiculaires dans les vertèbres du rachis d’un patient, ce système de traitement chirurgical (1) comporte une mèche (10), qui s’étend suivant un axe de mèche (X10) proximo-distal et qui est adaptée pour percer un trou dans le pédicule d’une vertèbre lorsque la mèche est entraînée en rotation. La mèche inclut, successivement suivant l’axe de mèche, une extrémité distale (11), un foret cylindrique (12), centré sur l’axe de mèche et prévu pour donner une forme de cylindre à une partie terminale distale du trou, et une fraise (13) adaptée pour donner à une partie terminale proximale du trou une forme d’entonnoir s’évasant progressivement depuis la partie terminale distale du trou. Le syst
