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US 2006/0135960 A1Published application
Bone screw comprising a tangential cutting edge
OwnerChad Munro, Peter Senninventors
Life of this patent
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Abstract
The invention relates to a bone screw having a longitudinal axis and a threaded shaft which has an external thread of an external diameter DA, a front thread end and a thread profile. The thread profile has a front thread flank that is oriented towards the front thread end. The front thread flank comprises a flank section that has a 90° offset in relation to the front thread flank, thereby forming a tangential cutting edge on the front thread end.
Claims12
A bone screw having a longitudinal axis comprising:
- a threaded shaft, which comprises an external thread with an external diameter DA, a front threaded end and a thread profile, wherein the thread profile as a front threaded flank which is directed towards the front threaded end, and a rear threaded flank;
- a front end;
- and
- a rear end, the rear end able to accommodate a tool,
- wherein the external thread at the front end of the thread comprises a flank piece, which is angled with respect to threaded flanks, so that a tangential cutting edge is formed thereby at the front end of the thread.
2 more elements
An assembly comprising:
- a bone screw having a front end and a rear end forming a longitudinal axis, wherein the bone screw further includes a threaded shaft, which comprises an external thread with an external diameter DA, a front threaded end and a thread profile, wherein the thread profile has a front threaded flank which is directed towards the front threaded end, and a rear threaded flank;
- a tubular bone blade with a central borehole which is coaxial with the longitudinal axis of the bone screw,
- wherein the front end of the bone screw protrudes coaxially beyond the tubular bone blade and the bone screw being rotatable about the longitudinal axis in the central borehole, and
- wherein the external thread of the bone screw at the front end of the thread comprises a flank piece, which is angled with respect to threaded flanks, so that a tangential cutting edge is formed thereby at the front end of the thread.
1 more element
Dependencies are inferred from the claim text.