1. A bone anchoring element comprising:
a shaft for anchoring in a bone, the shaft having a tubular body defined by a peripheral wall having a thickness, the peripheral wall defining an interior space of the tubular body extending along a shaft axis from a first end to a second end of the tubular body, wherein said shaft comprises a plurality of barb elements, wherein each barb element is formed as a continuous one-piece part with the tubular body;
wherein each barb element is moveable between a first position adjacent to a surface of the tubular body and a second position farther from the surface of the tubular body than the first position to define an opening completely through the peripheral wall to the interior space of the tubular body;
wherein each barb element comprises a base being a continuous one-piece part with the tubular body, opposing side walls extending from the base, and a free cutting edge opposite to the base relative to the side walls and extending between the side walls; and
wherein the free cutting edges of the barb elements are inclined at an angle corresponding to a helical angle that extends for at least one full turn around the shaft axis such that after insertion of the shaft into a core hole, turning of the shaft in a first direction causes the shaft to be moved in an insertion direction deeper in the core hole, and turning of the shaft in a second direction causes the shaft to be moved in the core hole opposite to the insertion direction.
2. The bone anchoring element of claim 1, wherein said barb elements are cut out of the wall of said tubular body, and wherein each barb element has a thickness equal to the thickness of the peripheral wall.
3. The bone anchoring element of claim 1, wherein said tubular body forms a hollow part of said shaft.
4. The bone anchoring element of claim 1, wherein said tubular body is placed onto an essentially cylindrical shaft part.
5. The bone anchoring element of claim 4, further comprising a tip which is fixedly connectable to the cylindrical shaft part.
6. The bone anchoring element of claim 4, further comprising means for preventing said tubular body from rotating relative to the cylindrical shaft part.
7. The bone anchoring element of claim 1, further comprising a tip which is fixedly connectable to said tubular body.
8. The bone anchoring element of claim 7, wherein a connection for fixedly connecting the tip to the tubular body comprises any one of a press-fit and a threaded connection.
9. The bone anchoring element of claim 7, further comprising a head, which is connectable to said tubular body.
10. The bone anchoring element of claim 1, further comprising a head, which is connectable to said tubular body.
11. The bone anchoring element of claim 1, wherein said tubular body is formed of a shape memory alloy.
12. The bone anchoring element of claim 11, wherein said tubular body is formed from nitinol.
13. The bone anchoring element of claim 1, wherein said tubular body includes two longitudinally opposing open ends.
14. The bone anchoring element of claim 1, wherein the plurality of barb elements are cut out of the tubular body with laser cutting.
15. A bone anchoring element comprising:
a shaft for anchoring in a bone, the shaft having a tubular body defined by a peripheral wall having a thickness, the peripheral wall defining an interior space of the tubular body extending along a shaft axis from a first end to a second end of the tubular body, wherein said shaft comprises a plurality of barb elements, wherein each barb element is formed as continuous one-piece part with the tubular body and includes opposing side walls extending from the base and a free cutting edge opposite to the base relative to the side walls and extending between the side walls;
a head connectable to the shaft;
a tip connectable to the shaft;
wherein each barb element is moveable between a first position adjacent to a surface of the tubular body and a second position farther from the surface of the tubular body than the first position to define an opening completely through the peripheral wall to the interior space of the tubular body; and
wherein the free cutting edges of the barb elements are inclined at an angle corresponding to a helical angle that extends for at least one full turn around the shaft axis such that after insertion of the shaft into a core hole, turning of the shaft in a first direction causes the shaft to be moved in an insertion direction deeper in the core hole, and turning of the shaft in a second direction causes the shaft to be moved in the core hole opposite to the insertion direction.
16. The bone anchoring element of claim 15, wherein the barb elements are cut out of a wall of the tubular body.
17. The bone anchoring element of claim 15, wherein said tubular body is placed onto an essentially cylindrical shaft part.
18. The bone anchoring element of claim 17, further comprising means for preventing said tubular body from rotating relative to the cylindrical shaft part.
19. The bone anchoring element of claim 15, wherein said tubular body is formed of a shape memory alloy.
20. The bone anchoring element of claim 19, wherein said tubular body is formed from nitinol.
21. The bone anchoring element of claim 15, wherein said tubular body includes two longitudinally opposing open ends.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A knob assembly comprising:
a rotatable knob having an under surface and a top surface;
a notched plate rotatable with said rotatable knob and arranged proximate to said under surface of said rotatable knob;
a magnetic detent assembly disposed substantially stationary proximate to said notched plate, wherein said magnet detent assembly includes a base member having at least one sealed enclosure, said at least one enclosure including a magnetically attractable member and a magnet;
wherein rotation of said rotatable knob and said notched plate over said magnetic detent assembly provides a user with an audible indicator of rotation.
2. The knob assembly of claim 1 wherein said magnetically attractable member is a sphere.
3. The knob assembly of claim 2 wherein said sphere is a steel ball.
4. The knob assembly of claim 1 wherein said base member includes a first recess for receiving said magnet.
5. The knob assembly of claim 4 wherein said first recess includes a second recess therein, said second recess dimensioned for receiving said magnetically attractable member.
6. The knob assembly of claim 1 wherein said magnetic detent assembly has a central area and a leg extending from each end thereof, thereby defining a generally U-shaped configuration.
7. A magnetic detent assembly for generating audible feedback during relative movement past a magnetizable structure, comprising:
a base member having a top surface and a bottom surface;
at least one magnetically attractable member disposed in a recess in said base member, said recess being elongated between a pair of opposite sides formed within said base member; and
at least one magnet disposed in said base member between said recess and said botton surface;
wherein said at least one magnetically attractable member is movably contained in said recess between said top surface of said base member and said at least one magnet, and wherein said at least one magnetically attractable member strikes at least one of said opposite sides during movement of said magnetizable structure past said top surface to generate said audible feedback.
8. The magnetic detent assembly of claim 7 wherein said recess is formed in a bottom surface of a magnet receiving recess in said base member.
9. The magnetic detent assembly of claim 7 wherein said at least one magnetically attractable member comprises a sphere.
10. The magnetic detent assembly of claim 7 where said at least one magnetically attractable member is formed from steel and said base member is formed from a plastic material.