This creation is a kind of related interlocking-type vertebral arch bone nail of what, particularly relates to a kind of knockdown centrum, can be screwed togather pullover and centrum to form vertebral arch bone nail by interlocking, and the surface system of the pullover is deliberately equipped with chromatograph, for differentiating the length of implant. It is mainly to be made of pullover and centrum, centrum system is strip and has extended downwardly spire, and the ring side of the end of what centrum is equipped with external screw thread, and it can be with thread locking within pullover, it is then hollow columnar to what pullover, and what surface forms nonferrous layer, when pullover and centrum are screwed togather Hou, the length that implant can be distinguished by chromatograph, to be shown as the depth put in what affected part vertebra.本創作係有關於一種互鎖式椎弓骨釘，特別是指一種組合式的椎體，能藉由互鎖將套頭與椎體螺合以組成椎弓骨釘，且該套頭之表面係刻意設有色層，供分辨植體的長度。其主要係由套頭及椎體所組成，該椎體係為長條狀並向下延伸有螺旋部，且於椎體之端頭的環邊設有外螺紋，而能與套頭之內螺紋鎖固，至於套頭則為中空柱狀，並於表面形成有色層，當將套頭與椎體螺合後，可藉由色層來區分植體的長度，以作為置放於患部脊椎內的深度顯示。
