Screw-Comprising Two Threads With Different Pitches, Used to Join Two Bone Segments

摘要

Self-compressing screws, especially self-threading screws, include a screw shaft having an axis of revolution, the screw shaft being provided with two threads that are centered on the axis of revolution, and a first envelope in the form of a rotary hollow cylinder defined by the thread, between the base and the tip of an individual thread section, fitting entirely inside the second envelope in the form of a rotary hollow cylinder defined by the thread, between the base and the tip of an individual thread section. A pitch P₁₁ of the thread is smaller than a pitch P₂₂ of the thread. A method of applying the screw for joining two bone segments is also provided in order to perform an osteosynthsis operation between the two bone segments.