Intervertebral disc implants and tooling

A kit for pretreating a disk space which accepts a piece (100) of a transplant is provided with a plurality of trials (152) which have a different size. Each trial (152) was provided with a main part (154) which can be inserted into a disk space, and a main part (154) is provided with a tip (162), the back end (164), the upper surface (156), and the undersurface (160). The upper surface of a main part has the 1st slot (176) formed in the upper surface. Each piece of a transplant is provided also with a flange (166) fixed to the back end (164) of a main part (154), and a flange (166) has the 1st passage (180) arranged along with the 1st slot (176) and straight line. Each of a trial of a different size has different flange thickness. Advance of a cutting tool like 鑿 (192) to the 1st Mizouchi of the upper surface of a trial main part will be controlled by this flange thickness, and the cut depth to 椎体内 will be controlled by this.