The utility model relates to the technical field of
medical instruments, in particular to an MR (magnetic
resonance) implantation needle developing core, an implantation needle and a positioning
assembly, the inside of the developing core comprises a
solid structure and a hollow structure, and developing liquid is packaged in the hollow structure; a plurality of packaging nodes are arranged on a needle body of the implantation needle, a developing solution capable of developing under nuclear
magnetism is packaged in a developing core, and a needle tip length checking ruler is matched to determine packaging scales of the developing solution, so that the implantation needle can adapt to implantation treatment in different scenes, a physicist can intuitively and accurately judge the position of a needle tip, and the accuracy of the implantation treatment is improved. Therefore, the dosage of implantation treatment is further accurate, errors caused by insufficient experience of doctors are avoided, meanwhile, damage to surrounding healthy tissues is reduced, the treatment safety is improved, and the method has important significance on accurate treatment of diseases such as tumors and the like.