This patent belongs to Zhang Tianmin, director of Tian Min Institute of Needle-Knife Medicine, and it is a utility model patent. It comprises a positioning rod with positioning holes at intervals, two slidable calipers, an angle measuring device, and a fixed-point needle which can be connected with the positioning holes.

The positioning device is simple in structure and convenient to operate, and can accurately determine the treatment site during needle knife treatment, thus ensuring the treatment effect and reducing the pain of patients.