Bone screw of double lead/read

摘要

Topic Insertion time insertion with short and optimum route is easy, pulling out strength is large, namely in plant to do offers the bone screw which is improved easily.SolutionsBone screw 10 head 12 and the 1st and 2nd helical screw thread 16 which opposes and 18 extending has the frame 14 which is present on the peripheral aspect. With a certain execution example, as for frame 14 it becomes small from the proximal part 14p and the proximal side which accompany fixed small diameter d₁ facing toward distal (2036) side and the distal (2036) part 14d which accompanies the small diameter d_{2 which} forms the taper and, it possesses. The 1st and 2nd helical screw thread 16 which opposes and 18 it is desirable to stipulate the height d of the screw thread which is fixed over the total length of frame 14 _t. The large diameter D₂ in the distal (2036) edge of frame 14 is equal to the small diameter d of the proximal part of frame, or 14₁ is small. Selective figure Figure 1