Compression bone screw
View Patent ↗A compression bone screw is described, with a shank having two opposite shank sections along its axial extent, a first thread being connected in a rotationally fixed manner to the shank in the region of the first shank section. The shank has at least one latching element for rotatably coupling a threaded component bearing a second thread to the second shank section. The invention furthermore relates to a screwdriver blade for the compression bone screw.
1. A bone screw, comprising;
a shank having opposite first and second shank sections with a first thread disposed on said shank at said first shank section,
a threaded component rotatably coupled and locked in both axial directions to said shank at said second shank section and including a second thread, and
at least one cutting edge disposed on said shank between said first thread and said threaded component,
said shank including a smooth unthreaded intermediate shank section between said at least one cutting edge and said first thread.
2. A bone screw as set forth in claim 1 wherein said first thread has a first diameter and said second thread has a second diameter greater than said first diameter.
3. A bone screw as set forth in claim 2 wherein said shank includes an enlarged portion adjacent said threaded component and said shank tapers from said enlarged portion toward said first shank section to define a taper.
4. A bone screw as set forth in claim 3 wherein said at least one cutting edge is disposed along said taper.
5. A bone screw as set forth in claim 4 wherein said at least one cutting edge is further defined as a plurality of cutting edges disposed along said taper.
6. A bone screw as set forth in claim 1 wherein said shank and said threaded component are cannulated for receiving a guide wire.
7. A bone screw as set forth in claim 1 wherein said shank includes at least one first latching element at said second shank section.
8. A bone screw as set forth in claim 7 wherein said threaded component includes at least one second latching element for engaging said at least one first latching element of said second shank section to rotatably couple said threaded component to said shank.
9. A bone screw as set forth in claim 8 wherein said at least one first latching element is further defined as a plurality of latching hooks and said at least one second latching element is further defined as a shoulder for snap-lock engagement with said plurality of latching hooks.
10. A bone screw as set forth in claim 1 wherein said threaded component is provided with a first force-receiving structure and said shank is provided with a second force-receiving structure, said first and second force-receiving structures being separate from each other.
11. A bone screw as set forth in claim 10 wherein said first and second force-receiving structures are adapted to be coupled to each other in a rotationally fixed manner in a first position and to permit relative rotation between each other in a second position.
12. A bone screw, comprising:
a shank having opposite first and second shank sections with a first thread disposed on said shank at said first shank section;
a threaded component rotatably coupled and locked in both axial directions to said shank at said second shank section, said threaded component including a second thread and being provided with a force-receiving structure that permits the application of a force separate from said shank that allows rotation of said threaded component relative to said shank; and
at least one cutting edge disposed on said shank between said first thread and said threaded component,
said shank including a smooth unthreaded intermediate shank section between said at least one cutting edge and said first thread.