Modular offset screw

Patent metadata

Field	Value
Publication number	US-11419639-B2
Application number	US-201816498722-A
Country	US
Kind code	B2
Filing date	Mar 28, 2018
Priority date	Mar 30, 2017
Publication date	Aug 23, 2022
Grant date	Aug 23, 2022

Abstract

A modular screw includes a first assembly and a second assembly. The first assembly includes a base portion having a head portion, a securing portion defining a first bore, and a receiving portion defining a second bore. The second assembly includes a first post, a second post including an engaging portion, and an elongate screw threadably engageable with the second post. The second post is dimensioned to be received through the second bore of the receiving portion of the first assembly such that when a first set screw is received in the first bore, the first set screw secures the base portion of the first assembly to the second post. The elongate screw received in the second post causes radial expansion of the engaging portion of the second post, which, in turn, causes the engaging portion to be affixed to the cavity of the first post.

First claim

What is claimed is:

1. A modular screw comprising:
a first assembly including a base portion having a head portion defining a slot dimensioned to receive a spinal rod, a securing portion defining a first bore and including a first set screw threadably received in the first bore, and a receiving portion defining a second bore; and
a second assembly operatively associated with the first assembly, the second assembly including:
a first post defining a cavity;
a second post including an engaging portion rotatably received in the cavity of the first post, the second post dimensioned to be received through the second bore of the receiving portion of the first assembly such that when the first set screw of the securing portion is received in the first bore of the securing portion, the first set screw secures the base portion of the first assembly to the second post; and
an elongate screw threadably engageable with the second post, wherein the elongate screw received in the second post causes radial expansion of the engaging portion of the second post, which, in turn, causes the engaging portion to be affixed to the cavity of the first post.

2. The modular screw according to claim 1 , wherein the engaging portion of the second post and the cavity of the first post have a ball and socket configuration.

3. The modular screw according to claim 1 , wherein the engaging portion of the second post defines a slit configured to enable radial expansion of the engaging portion.

4. The modular screw according to claim 1 , wherein the receiving portion of the first assembly defines an annular groove concentrically arranged with the second bore.

5. The modular screw according to claim 1 , wherein the second post defines internal threads configured to threadably engage the elongate screw.

6. The modular screw according to claim 1 , wherein the receiving portion of the first assembly includes a ring defining a slit configured to provide radial contraction and expansion of the ring, the ring configured to contract when the first set screw is threadably received in the first bore of the securing portion.

7. The modular screw according to claim 1 , wherein a first longitudinal axis defined by the first bore of the first assembly defines an acute angle with respect to a second longitudinal axis defined by the second bore.

8. The modular screw according to claim 1 , wherein the first post of the second assembly includes external threads along a length of the first post.

9. The modular screw according to claim 1 , wherein at least a portion of the first post is tapered along a length thereof.

10. The modular screw according to claim 9 , wherein the at least a portion of the first post extends at least a quarter of the length of the first post.

11. The modular screw according to claim 1 , wherein the first post of the second assembly includes an inner surface having a keyed surface distal of the cavity.

12. The modular screw according to claim 1 , wherein the head portion of the first assembly defines a lateral opening configured to receive a band therethrough.

13. The modular screw according to claim 1 , wherein the head portion of the first assembly includes inner walls defining internal threads configured to threadably engage a set screw configured to secure the spinal rod received in the slot.

14. The modular screw according to claim 1 , wherein the second post is configured for a polyaxial range of motion with respect to the first post, the polyaxial motion defines an angle with respect to a longitudinal axis defined by the first post in the range of about 15 degrees and about 60 degrees.

15. A modular screw comprising:
a first assembly including a base portion including a first set screw and a head portion configured to receive a spinal rod, the base portion defining a first bore configured to threadably receive the first set screw, and a second bore; and a second assembly including a first post configured to be at least partially received in tissue, a second post operatively associated with the first post, and an elongate screw operatively coupled with the second post to secure a relative orientation of the second post with respect to the first post, wherein the second post is dimensioned to be received in the second bore of the first assembly to selectively position the base portion of the first assembly along a length of the second post, and wherein tightening the first set screw secures the base portion of the first assembly to the second post at the selected position.

16. The modular screw according to claim 15 , wherein the first bore of the base portion defines a first axis and the second bore of the base portion defines a second axis, wherein the first and second axes define an acute angle with respect to each other.

17. The modular screw according to claim 15 , wherein the second post of the second assembly includes an engaging portion transitionable between a radially expanded state and a radially contracted state, wherein the engaging portion configured to maintain the orientation of the second post with respect to the first post when the engaging portion is in the radially expanded state.

18. The modular screw according to claim 15 , wherein the first post includes a tapered portion extending along a length of the first post.

19. The modular screw according to claim 18 , wherein the tapered portion extends partially along the length of the first post.

20. The modular screw according to claim 19 , wherein the tapered portion includes external threads.

Assignees

• K2M Inc

Inventors

• Errico Thomas J
• Newton Peter
• Shufflebarger Harry
• Mcclintock Larry E

Classifications

• A61B17/8685

  comprising multiple separate parts · CPC title

• A61B17/863

  with thread interrupted or changing its form along shank, other than constant taper · CPC title

• A61B17/8605

  Heads, i.e. proximal ends projecting from bone · CPC title

• A61B17/7076

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

• A61B2017/00526

  Methods of manufacturing · CPC title