| 摘要 |
The invention relates to a bone screw for use with external bone fracture fixation devices, comprising a substantially cylindrical shank (2) with a longitudinal axis (X-X), a head (3) formed at a free end (4) of the shank (2), and a threaded portion (5) terminated with a tip (6) at the opposite end from the free end (4). Advantageously, the screw head (3) includes a first flat (7) extending parallel to the longitudinal axis (X-X) from the free end (4), at least a second flat (8) aligned to the first flat (7) at a predetermined spacing therefrom, and at least a non-flat spacer portion (9) provided between the flats (7,8). The spacer portion (9) is arranged to enable said shank (2) to be cut off if necessary, and is formed with a groove (11) of predetermined depth to define a location of potential cut off of the shank (2). <IMAGE> |
