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

Patent metadata

Field	Value
Publication number	US-2021000513-A1
Application number	US-202016937302-A
Country	US
Kind code	A1
Filing date	Jul 23, 2020
Priority date	Sep 30, 2011
Publication date	Jan 7, 2021
Grant date	—

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

1 . A bone anchoring device comprising:
a receiving part for coupling a rod to a bone anchoring element, the receiving part comprising:
a rod receiving portion with a first end, a second end, and a U-shaped recess for receiving a rod, the recess extending from the first end in a direction of the second end and defining two free legs; and
a head receiving portion at the second end for accommodating and clamping a head of a bone anchoring element; and
a locking ring configured to be arranged around the head receiving portion, the locking ring comprising an engagement structure for engagement with a tool; wherein when the locking ring is around the head receiving portion, the locking ring can assume a locking position where the locking ring exerts 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.

2 . The bone anchoring device of claim 1 , wherein the engagement structure comprises a plurality of ribs extending in a circumferential direction of the locking ring.

3 . (canceled)

4 . The bone anchoring device of claim 1 , wherein the engagement structure comprises at least two ribs spaced apart from each other in an axial direction of the locking ring.

5 . The bone anchoring device of claim 1 , wherein the engagement structure comprises a thread.

6 . The bone anchoring device of claim 1 , wherein the locking ring comprises two projections that are 180° offset from each other for engagement with a rod.

7 - 8 . (canceled)

9 . The bone anchoring device of claim 1 , wherein the head receiving portion has an exterior surface with a tapered or curved portion and the locking ring has an interior surface with a tapered or curved portion which are configured to cooperate with one another to clamp an inserted head.

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

11 - 24 . (canceled)

Assignees

• Biedermann Technologies Gmbh

Inventors

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

Classifications

• A61B17/86 Primary

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

• A61B17/7076

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