US Patent 7736381 Bone screw and bone screw with holding element

A bone screw includes a thread section of tubular construction having a first end and a second end and a tip at the first end. The tubular thread section has a bone thread on its outer wall, which has a plurality of recesses. The bone screw further includes a holding element with a first section for connection to the thread section and a rod-like second section. The rod-like second section protrudes beyond the second end of the thread section in the inserted state of the holding element. The boric screw also includes a stop for limiting the distance of insertion of the holding element in the thread section. The holding element also includes an element at its free end for engagement with a screw-in tool.