This work is about the structure of a bone screw,The utility model relates to a hollow bone nail body which is surrounded by a threaded part with two sections of threads not connected,And the pitch of the first thread part and the second thread part is designed,The gradually reduced pitch can provide a good compression effect when it is joined with bone；At the same time of changing pitch,The thread depth (thread thread) of the second thread part adjacent to the tail end of the main body of the bone nail is gradually reduced,In addition, a conical structure was used to assist the advancement of the screws,This creates a higher thrust force that allows the bones to be repositioned.本創作係關於一種骨螺釘之結構，其係於一中空之骨釘主體之表面環繞設置兩段螺紋不相連接之螺紋部，並且於這第一螺紋部和第二螺紋部的螺距上有所設計，使得其逐漸縮減之螺距可在與骨頭接合時提供良好的壓縮效果；又在螺距變化的同時，讓鄰近骨釘主體尾端之第二螺紋部的螺紋深度(螺牙)逐漸縮減，以類似錐形之結構輔助骨螺釘的推進效果，藉此產生較高的推力使骨頭得以復位。
