Extraction tool for removing bone screws, in particular in orthopaedics or accident surgery

摘要

The tool has a hollow cutter (12) insertable over a workpiece (51) to be extracted to drill a passage (53). The cutter has cutting elements at its proximal end and engaging elements provided in its hollow centric inner space, so that the tool is fixedly connected with the workpiece in preset penetrating depth. Hollow inner sides have a partially smooth inner wall section (22) that tapers in its diameter. A core body is made of steel e.g. silicon-based chromium-vanadium spring steel, consisting of 0.63 to 0.73 percent of carbon, 0.2 to 1 percent of manganese and 1.5 to 2.5 percent of silicon.