Granted Patent B2

US 12,303,401 · App. 18/608,046 · Granted May 20, 2025

Inventors: Christian Karl Schultz (Hoboken, NJ); Bryan D. Milz (Florida, NY); Zinoviy Sosnov (Fair Lawn, NJ)

Assignee: K2M, Inc.

A61F2/447A61B17/1757A61F2/30749A61F2/442A61F2/4611B60R19/023A61F2002/3049A61F2002/30593A61F2002/30784A61F2310/00023

Abstract

Claims (33)

1. An intervertebral spacer assembly comprising:

an intervertebral spacer having a superior surface configured to engage a superior vertebral body, an inferior surface configured to engage an inferior vertebral body, and a proximal surface comprising a first fastener channel oriented to pass through the proximal and superior surfaces of the intervertebral spacer at a first angle, a second fastener channel oriented to pass through the proximal and inferior surfaces of the intervertebral spacer at a second angle; and a locking member channel intermediate the first and second fastener channels, the locking member channel including an inner wall, an annular ridge formed in the inner wall, a first pair of recesses formed in the inner wall, and a second pair of recesses formed in the inner wall and angularly offset from the first pair of recesses; and

a locking member comprising:

a first anti-backout member;

a second anti-backout member; and

a collet having an annular flange configured to be retained by the annular ridge of the locking member channel in order to rotatably couple the locking member to the intervertebral spacer; a first stop protrusion projecting outwardly from a first side of a peripheral wall, and a second stop protrusion projecting from a second side of the peripheral wall so that the locking member is rotatable within the locking member channel between two stable positions comprising an unlocked position and a locked position, such that in the unlocked position, the first and second stop protrusions protrude into the first pair of recesses in order to retain the locking member in the unlocked position, and the first and second anti-backout members do not obstruct the first and second fastener channels; and in the locked position, the first and second stop protrusions protrude into the second pair of recesses in order to retain the locking member in the locked position, and the first and second anti-backout members obstruct the first and second fastener channels in order to prevent the first and second fasteners from backing out of the first and second fastener channels.

2. The intervertebral spacer assembly of claim 1 , further comprising at least one bone graft channel oriented to pass through opposing ends of the intervertebral spacer.

3. An intervertebral spacer comprising:

a proximal end comprising:

at least one fastener channel; configured to receive a fastener, the at least one fastener channel oriented to pass through the proximal end of the intervertebral spacer; and

a locking member channel comprising:

an inner wall; and

one or more inner wall engagement features; and

a locking member comprising:

an anti-backout member;

the locking member being arranged and configured so as to be retainable within the locking member channel; and

one or more engagement features arranged so as to be suitable to engage at least one of a slot and a rail;

wherein:

 the locking member is rotatable within the locking member channel between an unlocked position and a locked position;

 in the unlocked position, the one or more engagement features engage the one or more inner wall engagement features in order to retain the locking member in the unlocked position, independently of any additional component besides the locking member and the intervertebral spacer, and the anti-backout member does not obstruct the fastener channel; and

 in the locked position, the one or more engagement features engage the one or more inner wall engagement features to retain the locking member in the locked position, independently of any additional component besides the locking member and the intervertebral spacer, and the anti-backout member obstructs the fastener channel in order to prevent the fastener from backing out of the fastener channel

wherein the one or more engagement features of the locking member are compressible.

4. The intervertebral spacer of claim 3 , wherein the proximal end of the intervertebral spacer comprises: a first stop surface configured to prevent the locking member from rotating in a first direction past the unlocked position; and a second stop surface configured to prevent the locking member from rotating in a second direction past the locked position.

5. The intervertebral spacer of claim 3 , further comprising at least one bone graft channel oriented to pass through opposing ends of the intervertebral spacer.

6. The intervertebral spacer of claim 3 , wherein the at least one fastener channel comprises: a first fastener channel configured to receive a first fastener, the first fastener channel oriented to pass through the proximal end and a superior surface of the intervertebral spacer at a first angle; and a second fastener channel configured to receive a second fastener, the second fastener channel oriented to pass through the proximal end and an inferior surface of the intervertebral spacer at a second angle.

7. The intervertebral spacer of claim 6 , wherein the locking member further comprises a second anti-backout member such that in the locked position, the anti-backout member obstructs the first fastener channel and the second anti-backout member obstructs the second fastener channel.

8. The intervertebral spacer of claim 3 , wherein the locking member channel further comprises an annular ridge on the inner wall, the annular ridge being spaced apart from an at least one bone graft channel oriented to pass through opposing ends of the intervertebral spacer.

9. The intervertebral spacer of claim 8 , wherein the locking member channel extends from the proximal end to the at least one bone graft channel.

10. The intervertebral spacer of claim 3 , further comprising a superior surface and an inferior surface, wherein the superior and inferior surfaces include teeth.

11. The intervertebral spacer of claim 3 , wherein the anti-backout member includes a drive adapted for receipt of a drive tool, a center of the drive being coaxial with an axis of rotation of the locking member.

12. The intervertebral spacer of claim 3 , wherein the engagement features include a slit passing therethrough.

13. The intervertebral spacer of claim 12 , wherein the engagement features further comprises a pair of surfaces that define the slit, the surfaces being parallel to an axis of rotation of the locking member.

14. The intervertebral spacer of claim 3 , wherein the locking member further comprises an annular flange at a distal end.

Assignments (4)

Continuity (5)

References Cited (244)