| abstract |
A bolt with an external thread and a cylindrical bolt shank made of allogeneic, cortical bone material for surgically operative osteosynthesis, wherein the external thread concerns a symmetrical angular or trapezoidal thread which has at least one thread turn per millimeter, and the bone material is formed by osteons ( 5 ) and is permeated by Haversian canals ( 6 ). According to the invention, it is proposed that the thread flanks ( 9 a, 9 b ), delimiting a thread groove of the angular or trapezoidal thread merge into one another via a thread root portion ( 8 ) whose length, in an axial section of the bolt, is in the range of 0.02 mm to 0.6 mm. In this way, it is possible to produce bone screws ( 1 ) with increased strength, such that less suitable donor material can also be used for the production of high-quality bone screws ( 1 ). |