The medical application screw (100) the frame (102) is included, the screw (106) with, the screw (100) the distal (2036) point for guide in order to introduce to in the transplantation region which is perforated extra (108) with has been provided to this frame. This medical application screw (100) the screw (106), the 1st set norasen condition screw thread which has 1st diameter (114) with, this 1st set norasen condition screw thread puts and is put, at the same time, the 2nd set norasen condition screw thread which has 2nd diameter (116) with has been provided, here, 1st diameter differs from 2nd diameter. In addition, this medical application screw (100), in order to accept bone growth, the anti- rotary groove which is formed (402) had could have been provided.医療用ねじ(100)には軸部(102)が含まれており、この軸部には、ねじ部(106)と、ねじ(100)を予備穿孔された移植部位の中へ導入するための案内用遠位先端(108)とが備わっている。この医療用ねじ(100)のねじ部(106)には、第1直径のある第1組のらせん状ねじ山(114)と、この第1組のらせん状ねじ山が挿し挟まれ、かつ、第2直径のある第2組のらせん状ねじ山(116)とが備わっており、ここで、第1直径が第2直径とは異なっている。加えて、この医療用ねじ(100)には、骨成長を受け入れるように構成された抗回転溝(402)が備わっていてもよい。
