Receiving part and instrument for holding the receiving part

Patent metadata

Field	Value
Publication number	US-12433643-B2
Application number	US-202117523414-A
Country	US
Kind code	B2
Filing date	Nov 10, 2021
Priority date	Aug 8, 2017
Publication date	Oct 7, 2025
Grant date	Oct 7, 2025

Abstract

A receiving part of a bone anchoring device includes a channel adjacent a first end for receiving a bone fixation element, the channel forming two free legs each having an engagement structure for engaging a locking element to lock the bone fixation element in the channel, an outer surface portion, and at least one projection for engaging an instrument to connect the instrument to the receiving part. The projection projects radially outwardly from the outer surface portion, is spaced apart axially from the first end of the receiving part, and has a circumferential width less than a circumferential width of the legs. The projection has a first side wall that faces the first end. At least part of the first side wall is inclined towards the first end as the first side wall extends circumferentially, to form a region of the projection that narrows towards the first end.

First claim

What is claimed is:

1. A receiving part for connecting a rod to bone, the receiving part having a first end, a second end below the first end, and a central axis extending through the first end and the second end, and comprising:
two free legs defining a channel adjacent to the first end for receiving the rod;
an outer surface portion that faces away from the central axis; and
at least one projection configured to engage an engagement recess of an instrument to provide a connection between the instrument and the receiving part, wherein the at least one projection is spaced apart axially from the first end of the receiving part, is spaced apart circumferentially from the channel on one side by a first region of the outer surface portion, and is spaced apart circumferentially from the channel on an opposite side by a second region of the outer surface portion;
wherein the at least one projection extends laterally away from the central axis from a base connected to the outer surface portion of the receiving part to an outwardly facing surface, wherein the outwardly facing surface extends to an axial position that is lower than a lowest axial position of the base such that an undercut is formed at a lower surface of the at least one projection, and wherein a circumferential width of the outwardly facing surface is greater than a maximum circumferential width of the base such that undercuts are formed on both sides of the at least one projection.

2. The receiving part according to claim 1 , wherein the at least one projection has a triangular shape when viewed in a direction perpendicular to the central axis.

3. The receiving part according to claim 1 , wherein the outwardly facing surface of the at least one projection has a cylindrical contour.

4. The receiving part according to claim 1 , wherein the at least one projection further comprises first and second side walls between the base and the outwardly facing surface that are inclined as the side walls extend circumferentially around the central axis to guide and align the instrument when the instrument is attached to the receiving part.

5. The receiving part according to claim 4 , wherein the first and second side walls converge at a tip portion of the at least one projection that faces the first end of the receiving part.

6. The receiving part according to claim 5 , wherein the tip portion is chamfered to facilitate attachment of the instrument to the at least one projection.

7. The receiving part according to claim 1 , wherein the at least one projection comprises two projections, with one of the projections being provided on each of the legs.

8. The receiving part according to claim 1 , wherein the at least one projection comprises two projections that are both formed on one of the two free legs and that are completely circumferentially spaced apart from one another.

9. The receiving part according to claim 1 , wherein at least part of the at least one projection extends farther away radially from the central axis than every other portion of the receiving part.

10. A receiving part for connecting a rod to bone, the receiving part having a first end, a second end opposite to the first end, and a central axis extending through the first end and the second end, and comprising:
two free legs defining a channel adjacent to the first end for receiving the rod;
an outer surface portion that faces away from the central axis; and
at least one projection configured to engage an engagement recess of an instrument to provide a connection between the instrument and the receiving part, wherein the at least one projection is spaced apart axially from the first end of the receiving part, is spaced apart circumferentially from the channel on one side by a first region of the outer surface portion, and is spaced apart circumferentially from the channel on an opposite side by a second region of the outer surface portion; and
wherein the at least one projection extends laterally away from the central axis from a base connected to the outer surface portion of the receiving part to an outwardly facing surface, wherein the outwardly facing surface extends uninterruptedly from a first circumferential end to a second circumferential end, and wherein a circumferential width of the outwardly facing surface measured between the first and second circumferential ends is greater than a maximum circumferential width of the base such that undercuts are formed on both sides of the at least one projection adjacent the first and second circumferential ends.

11. The receiving part according to claim 10 , wherein the at least one projection has a triangular shape when viewed in a direction perpendicular to the central axis.

12. The receiving part according to claim 10 , wherein the outwardly facing surface of the at least one projection has a cylindrical contour.

13. The receiving part according to claim 10 , wherein the at least one projection further comprises first and second side walls between the base and the outwardly facing surface that are inclined as the side walls extend circumferentially around the central axis to guide and align the instrument when the instrument is attached to the receiving part.

14. The receiving part according to claim 13 , wherein the first and second side walls converge at a tip portion of the at least one projection that faces the first end of the receiving part.

15. The receiving part according to claim 14 , wherein the tip portion is chamfered to facilitate attachment of the instrument to the at least one projection.

16. The receiving part according to claim 10 , wherein the at least one projection comprises two projections, with one of the projections being provided on each of the legs.

17. The receiving part according to claim 10 , wherein when viewed in a plane perpendicular to the central axis, at least part of each of the undercuts extends radially relative to the central axis from the base towards the outwardly facing surface.

18. The receiving part according to claim 10 , wherein at least one side of the at least one projection is concavely curved and configured to mate with a corresponding convexly curved surface of the instrument in a form-fit manner.

Assignees

• Biedermann Technologies Gmbh

Inventors

• Biedermann Timo
• Dandanopoulos Dimosthenis

Classifications

• A61B17/866

  Material or manufacture · CPC title

• A61B17/7086

  Rod reducers, i.e. devices providing a mechanical advantage to allow a user to force a rod into or onto an anchor head other than by means of a rod-to-bone anchor locking element; rod removers · CPC title

• A61B17/7076

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

• A61B2017/8655

  with special features for locking in the bone · CPC title

• A61B17/8625

  Shanks, i.e. parts contacting bone tissue · CPC title