Bone anchoring device and tool cooperating with such a bone anchoring device

Patent metadata

Field	Value
Publication number	US-12096962-B2
Application number	US-202217956575-A
Country	US
Kind code	B2
Filing date	Sep 29, 2022
Priority date	Sep 30, 2011
Publication date	Sep 24, 2024
Grant date	Sep 24, 2024

Abstract

A bone anchoring device includes a receiving part including a rod receiving portion with a first end, a second end, and a U-shaped recess for receiving a rod, the recess defining two free legs, and a head receiving portion at the second end for introducing and clamping the head, and a locking ring configured to be arranged around the head receiving portion, the locking ring including an engagement structure for engagement with a tool, the engagement structure defining a width of the locking ring that is greater than a greatest width of the rod receiving portion, wherein the locking ring can assume a locking position exerting a greatest compressive force on the head receiving portion of the receiving part to lock an inserted head, and wherein the locking ring is movable out of the locking position towards the first end of the rod receiving portion.

First claim

What is claimed is:

1. A bone anchoring device for coupling a rod to a bone anchoring element, the bone anchoring device comprising:
a receiving part having a first end, a second end, and a central axis extending between the first and second ends, and comprising a rod receiving portion defining a U-shaped recess for receiving the rod, the recess extending from the first end towards the second end to form two free legs, and a head receiving portion at the second end for pivotably accommodating a head of the bone anchoring element; and
a ring configured to be assembled to the head receiving portion, the ring comprising an outer surface that faces away from the central axis when the ring is assembled to the head receiving portion and a thread formed on at least part of the outer surface;
wherein when the ring is assembled to the head receiving portion, the bone anchoring device is configured to assume a locking position where an axial position of the ring relative to a compressible portion of the bone anchoring device is adjusted such that the ring exerts a compressive force on the compressible portion to clamp a head of a connected bone anchoring element to lock an angular position of the bone anchoring element relative to the receiving part.

2. The bone anchoring device of claim 1 , wherein the head receiving portion comprises the compressible portion.

3. The bone anchoring device of claim 1 , wherein the ring is positionable around the head receiving portion.

4. The bone anchoring device of claim 1 , wherein the ring comprises a closed ring that is configured to extend circumferentially entirely around the central axis.

5. The bone anchoring device of claim 1 , wherein the thread is configured to remain completely spaced apart from the receiving part.

6. The bone anchoring device of claim 1 , wherein the thread forms an engagement structure for engagement with a tool.

7. The bone anchoring device of claim 1 , wherein an axial position of the ring relative to an entirety of the receiving part is adjusted to assume the locking position.

8. The bone anchoring device of claim 1 , wherein the ring and the head receiving portion comprise cooperating surfaces configured to directly engage with one another in the locking position.

9. The bone anchoring device of claim 1 , wherein the ring comprises a rod engaging surface configured to engage the rod.

10. The bone anchoring device of claim 1 , further comprising the bone anchoring element comprising a shank for anchoring in bone and the head.

11. The bone anchoring device of claim 10 , wherein at least part of the ring is configured to extend to an axial position that is closer to the second end of the receiving part than a greatest diameter of the head measured in a direction perpendicular to the central axis is to the second end of the receiving part.

12. The bone anchoring device of claim 10 , wherein the head receiving portion is configured to directly engage the head.

13. The bone anchoring device of claim 10 , wherein the head of the bone anchoring element is configured to be inserted into the head receiving portion from the second end of the receiving part.

14. A bone anchoring device for coupling a rod to a bone anchoring element, the bone anchoring device comprising:
a receiving part having a first end, a second end, and a central axis extending between the first and second ends, and comprising a rod receiving portion defining a U-shaped recess for receiving the rod, the recess extending from the first end towards the second end to form two free legs, and a head receiving portion at the second end for pivotably accommodating a head of the bone anchoring element; and
a ring configured to be assembled to the head receiving portion from the second end of the receiving part, the ring comprising an outer surface that faces away from the central axis when the ring is assembled to the head receiving portion and a thread formed on at least part of the outer surface;
wherein when the ring is assembled to the head receiving portion, the bone anchoring device is configured to assume a locking position where a compressive force is exerted on a head of a connected bone anchoring element to lock an angular position of the bone anchoring element relative to the receiving part.

15. The bone anchoring device of claim 14 , wherein the head receiving portion comprises a compressible portion.

16. The bone anchoring device of claim 14 , wherein the ring is positionable around the head receiving portion.

17. The bone anchoring device of claim 14 , wherein the thread is configured to remain completely spaced apart from the receiving part.

18. The bone anchoring device of claim 14 , wherein the thread forms an engagement structure for engagement with a tool.

19. The bone anchoring device of claim 14 , wherein an axial position of the ring relative to an entirety of the receiving part is adjusted to assume the locking position.

20. A bone anchoring device for coupling a rod to a bone anchoring element, the bone anchoring device comprising:
a receiving part having a first end, a second end, and a central axis extending between the first and second ends, and comprising a rod receiving portion defining a U-shaped recess for receiving the rod, the recess extending from the first end towards the second end to form two free legs, and a head receiving portion at the second end for pivotably accommodating a head of the bone anchoring element; and
a ring configured to be assembled to the head receiving portion, the ring comprising an outer surface that faces away from the central axis when the ring is assembled to the head receiving portion and a thread formed on at least part of the outer surface, and an inner surface that faces towards the central axis when the ring is assembled to the head receiving portion, wherein part of the inner surface that is farther away from the first end of the receiving part extends closer radially to the central axis than part of the inner surface that is closer to the first end of the receiving part;
wherein when the ring is assembled to the head receiving portion, the bone anchoring device is configured to assume a locking position where a compressive force is exerted on a head of a connected bone anchoring element to lock an angular position of the bone anchoring element relative to the receiving part.

21. The bone anchoring device of claim 20 , wherein the head receiving portion comprises a compressible portion.

22. The bone anchoring device of claim 20 , wherein the ring is positionable around the head receiving portion.

23. The bone anchoring device of claim 20 , wherein the thread is configured to remain completely spaced apart from the receiving part.

24. The bone anchoring device of claim 20 , wherein the thread forms an engagement structure for engagement with a tool.

25. The bone anchoring device of claim 20 , wherein an axial position of the ring relative to an entirety of the receiving part is adjusted to assume the locking position.

Assignees

• Biedermann Technologies Gmbh

Inventors

• Biedermann Lutz
• Biedermann Timo
• Matthis Wilfried
• Dannecker Berthold

Classifications

• A61B17/7076

  for driving, positioning or assembling spinal clamps or bone anchors specially adapted for spinal fixation · CPC title

• A61B17/70

  Spinal positioners or stabilisers, e.g. stabilisers comprising fluid filler in an implant · CPC title

• A61B17/7035 Primary

  Screws or hooks, wherein a rod-clamping part and a bone-anchoring part can pivot relative to each other · CPC title

• A61B17/86 Primary

  Pins or screws {or threaded wires; nuts therefor (A61B17/72 take precedence)} · CPC title