IP Library › Granted Patent US 50,915
Granted Patent E1
US 50,915 · App. 18/200,660 · Granted Jun 16, 2026

Threaded locking structures for affixing bone anchors to a bone plate, and related systems and methods

Inventors: Simon M. Bosshard (Bern, CH); Michael McGurk (Williamstown, NJ); Mirko Rocci (Bettlach, CH); Stefan Dude (Neuendorf, CH)
Assignee: DePuy Synthes Products, Inc.
A61B17/8057
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Quick Facts
Patent No.
US 50,915
App. No.
18/200,660
Granted
Jun 16, 2026
Kind
E1
Abstract

A bone plate includes at least one hole extending through the bone plate from an upper plate surface to a lower plate surface along a central hole axis that is oriented along an axial direction. The at least one hole defined by an interior surface of the bone plate. The interior surface further defining a plurality of columns sequentially located about a circumference of the interior surface and a plurality of recesses located circumferentially between the columns. Each of the columns defines a plurality of thread segments each defining a root, a first thread surface extending from the root to a first crest, and a second thread surface extending from the root to a second crest. At least a portion of the first and second thread surfaces are offset from one another at a thread angle. The thread angle of at least one of the thread segments is in a range of about 5 degrees to about 59 degrees.

Claims (52)

1 . A bone plate comprising:

an upper surface configured to face away from a bone and an opposed lower surface configured to face the bone; and

at least one hole extending through the bone plate from the upper surface to the lower surface along a central hole axis, the central hole axis oriented along an axial direction, the at least one hole defined by an interior surface of the bone plate, the interior surface further defining a plurality of columns sequentially located about a circumference of the interior surface and a plurality of recesses located circumferentially between the columns, wherein each of the columns defines a plurality of thread segments,

wherein each of the thread segments defines a root, a first thread surface extending from the root to a first crest, a second thread surface extending from the root to a second crest, and at least a portion of the first and second thread surfaces are offset from one another at a thread angle, and

wherein the thread angle of at least one of the thread segments is in a range of 20 degrees to 40 degrees.

2 . The bone plate of claim 1 , wherein the thread angle is in the range of 25 degrees to 35 degrees.

3 . The bone plate of claim 2 , wherein, in each of the plurality of columns, the first and second crests of at least a majority of the thread segments are coincident with a centerline of the respective column, wherein the centerline extends along a plane that includes the central hole axis.

4 . The bone plate of claim 3 , wherein the centerline is oriented at a first angle relative to the central hole axis, and the first angle is in a range of about 10 degrees to about 20 degrees.

5 . The bone plate of claim 3 , wherein the pluralities of thread segments of the columns extend along one or more helical paths.

6 . The bone plate of claim 5 , wherein the one or more helical paths comprise a double-lead helical path.

7 . The bone plate of claim 6 , wherein at least one of the thread segments defines a thread pitch between the respective first and second crests along the axial direction, and one or both of the respective first and second crests is configured to deflect, non-destructively, up to a distance along the axial direction equivalent to one half of the thread pitch.

8 . The bone plate of claim 5 , wherein the one or more helical paths are coincident with at least one of the first and second crests of each thread segment, and the root of each thread segment extends along a second path about the central hole axis, wherein a radius of curvature of the second path is greater at the columns than at locations remote from the columns.

9 . The bone plate of claim 2 , wherein:

the first and second thread surfaces each defines a first portion and a second portion, the first portion extending from the root to the second portion, the second portion extending from the first portion toward the respective first or second crest; and

the thread angle is a first thread angle measured between the respective first portions; and

the respective second portions are offset from one another at a second thread angle that is different than the first thread angle.

10 . The bone plate of claim 9 , wherein the second thread angle is in a range of about 45 degrees to about 90 degrees.

11 . The bone plate of claim 9 , wherein the first thread angle is about 30 degrees and the second thread angle is about 60 degrees.

12 . The bone plate of claim 9 , wherein:

the first and second thread surfaces each defines a third portion extending from the second portion to the respective first or second crest; and

the respective third portions are offset from one another at a third thread angle that is different than the second thread angle.

13 . The bone plate of claim 12 , wherein the third thread angle is in a range of about 70 degrees to about 179 degrees.

14 . The bone plate of claim 12 , wherein the first thread angle is about 30 degrees, the second thread angle is about 60 degrees, and the third thread angle is about 90 degrees.

15 . The bone plate of claim 12 , wherein the first and second thread surfaces each extend along a respective involute curve between the root and the respective first or second crest, the first and second thread surfaces define a varying thread angle, and the varying thread angle varies in a range from about 5 degrees adjacent to the root to 179 degrees at the crests.

16 . The bone plate of claim 1 , wherein at least one crest of each column is configured to deform outward away from the central hole axis along a radial direction that is perpendicular to the axial direction responsive to threaded engagement with at least one thread of a locking screw inserted within the at least one hole.

17 . The bone plate of claim 1 , wherein the plurality of columns comprises three columns, and the plurality of recesses comprises three recesses.

18 . The bone plate of claim 17 , wherein each of the recesses defines a recess axis spaced from the central hole axis along a radial direction that is perpendicular to the axial direction, and each recess axis is parallel with the central hole axis.

19 . The bone plate of claim 18 , wherein the recess axes are equidistant from the central hole axis, and each recess defines a portion of a frusto-conical shape having a central cone axis coincident with the respective recess axis, wherein the frusto-conical shape is the frustum of a right circular cone.

20 . The bone plate of claim 19 , wherein the at least one hole intersects another hole, and the at least one hole and the another hole collectively define a combination hole.

21. A bone plate comprising:

an upper surface configured to face away from a bone and an opposed lower surface configured to face the bone; and

at least one hole extending through the bone plate from the upper surface to the lower surface along a central hole axis, the central hole axis oriented along an axial direction, the at least one hole defined by an interior surface of the bone plate, the interior surface further defining a plurality of columns sequentially located about a circumference of the interior surface, wherein each of the columns defines a plurality of thread segments,

wherein each of the thread segments defines a root, a first thread surface extending from the root to a first crest, a second thread surface extending from the root to a second crest, and at least a portion of the first and second thread surfaces are offset from one another at a thread angle, and

wherein the thread angle of at least one of the thread segments is in a range of 20 degrees to 40 degrees.

22. The bone plate of claim 21 , wherein the thread angle is in the range of 25 degrees to 35 degrees.

23. The bone plate of claim 22 , wherein, in each of the plurality of columns, the first and second crests of at least a majority of the thread segments are coincident with a centerline of the respective column, wherein the centerline extends along a plane that includes the central hole axis.

24. The bone plate of claim 23 , wherein the centerline is oriented at a first angle relative to the central hole axis, and the first angle is in a range of about 10 degrees to about 20 degrees.

25. The bone plate of claim 23 , wherein the pluralities of thread segments of the columns extend along one or more helical paths.

26. The bone plate of claim 25 , wherein the one or more helical paths comprise a double-lead helical path.

27. The bone plate of claim 26 , wherein at least one of the thread segments defines a thread pitch between the respective first and second crests along the axial direction, and one or both of the respective first and second crests is configured to deflect, non-destructively, up to a distance along the axial direction equivalent to one half of the thread pitch.

28. The bone plate of claim 25 , wherein the one or more helical paths are coincident with at least one of the first and second crests of each thread segment, and the root of each thread segment extends along a second path about the central hole axis, wherein a radius of curvature of the second path is greater at the columns than at locations remote from the columns.

29. The bone plate of claim 21 , wherein at least one crest of each column is configured to deform outward away from the central hole axis along a radial direction that is perpendicular to the axial direction responsive to threaded engagement with at least one thread of a locking screw inserted within the at least one hole.

30. A bone plate comprising:

an upper surface configured to face away from a bone and an opposed lower surface configured to face the bone; and

a hole extending through the bone plate from the upper surface to the lower surface, the hole defined by an interior surface of the bone plate, the interior surface further defining a plurality of threaded columns sequentially located about a circumference of the interior surface,

wherein the threaded columns comprise threading that defines a root, a first thread surface extending from the root to a first crest, a second thread surface extending from the root to a second crest, and at least a portion of the first and second thread surfaces are offset from one another at a thread angle that is in a range of 20 degrees to 40 degrees.

31. The bone plate of claim 30 , wherein the columns are evenly spaced about the hole.

32. The bone plate of claim 30 , wherein the thread angle is in the range of 25 degrees to 35 degrees.

33. The bone plate of claim 30 , wherein the thread angle is about 30 degrees.

34. The bone plate of claim 30 , wherein the threading is helical.

35. The bone plate of claim 30 , wherein the threading defines a thread pitch between the respective first and second crests, and one or both of the respective first and second crests is configured to deflect, non-destructively, up to a distance along the axial direction equivalent to one half of the thread pitch.

36. The bone plate of claim 30 , wherein at least one crest of the threading of each of the threaded columns is configured to radially deform in response to a threaded engagement with at least one thread of a locking screw inserted within the hole.

Continuity (1)
Reissue 15966047 · Apr 30, 2018
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