TRANSPARENCY DRILL FOR ENSURING OPPORTUNITY

摘要

1. Trepanation drill (8, 8 ') for performing bone drilling, characterized in that it contains in the outermost region a reduced region (9) with a diameter smaller than the rest of the body of the trepanation drill (8), wherein said reduced region (9) ends with an emphasis (10) indicating when the trepan drill (8, 8 ') should not be inserted further. 2. The trepan drill (8 ') according to claim 1, comprising a housing (11) and a tip (12) connected to each other, while the diameter of the tip (12) is smaller than the diameter of the housing (11), and the reduced area (9) of the trephine drill (8 ') is contained in the tip (12), when the emphasis (10) is located at the end of the housing (11). 3. The trepan drill (8 ') according to claim 2, wherein the tip (12) is connected to the housing (11) via at least one transverse locking element (13). 4. The trepan drill (8 ') according to claim 1, wherein the height (h) of the reduced region (9) is 2-8 mm. 5. The trepan drill (8 ') according to claim 4, wherein the height (h) of the reduced region (9) is 4.5-5.5 mm.