Securing fasteners

Patent metadata

Field	Value
Publication number	US-11986224-B2
Application number	US-202117502107-A
Country	US
Kind code	B2
Filing date	Oct 15, 2021
Priority date	May 27, 2011
Publication date	May 21, 2024
Grant date	May 21, 2024

Abstract

A fastener, for example a bone screw, is sized to pass into an aperture of an implant, for example, a bone plate, the fastener having an anchor portion engageable with body tissue, and a head portion formed by an assembly of an insert and an anchor extension. The insert and anchor extension cooperate to form a reduced dimension passable into the aperture, and an expanded dimension not passable out of the aperture. The size of the assembly may be configurable, for example, by tabs, ramped surfaces, or an expanding diameter of a threadable insert.

First claim

What is claimed is:

1. A spinal system comprising:
an implant comprising an aperture for receiving a fastener therethrough;
a fastener into the aperture, wherein the fastener comprises:
a head portion including one or more resilient tabs; and
an anchor portion, wherein the anchor portion is insertable into a bone member; and

an insert configured to be inserted and rotated into an opening of the head portion of the fastener, wherein the insert includes a non-threaded portion with an enlarged diameter at a proximal end and a threaded portion at a distal end, the diameter of threading in the threaded portion varying between a leading end and a trailing end,
wherein the head is configured to have a resting maximum dimension allowing for entry into the aperture and an expanded maximum dimension securing the head portion in the aperture, and
wherein the insert is configured to engage the head in an interference fit to expand the one or more resilient tabs in the expanded maximum dimension.

2. The system of claim 1 , wherein the one or more resilient tabs are disposed circumferentially around the head portion the head portion contains a relief in between each of the resilient tabs.

3. The system of claim 1 , wherein the insert is threaded into the head portion of the fastener.

4. The system of claim 3 , wherein the insert is configured to threadedly engage the head portion to expand the head portion.

5. The system of claim 4 , wherein the insert contains threads that increase in diameter as the insert is threaded into the head portion.

6. The system of claim 1 , wherein the head portion and the aperture each contain matable curved surfaces to allow for polyaxial movement of the fastener.

7. The system of claim 1 , wherein the one or more resilient tabs are configured to compress inwardly as the head portion enters the aperture.

8. The system of claim 1 , wherein the insert has an upper diameter that is greater than a lower diameter of the insert.

9. The system of claim 1 , wherein the implant comprises at least one of a plate, a rod, a bar, a joint replacement, or an anchoring member.

10. The system of claim 1 , wherein the anchor portion is configured to form or expand an opening in bodily tissue.

11. A spinal system comprising:
a plate member having an aperture against a bone member;
a fastener comprising:
a head portion including one or more resilient tabs; and
an anchor portion, wherein the anchor portion is insertable into a bone member; and

an insert configure to be inserted and rotated into an opening of the head portion of the fastener, wherein the insert includes a non-threaded portion with an enlarged diameter at a proximal end and a threaded portion at a distal end, the diameter of threading in the threaded portion varying between a leading end and a trailing end,
wherein the head is configured to have a resting maximum dimension allowing for entry into the aperture and an expanded maximum dimension securing the head portion in the aperture, and
wherein the insert is configured to engage the head in an interference fit to expand the one or more resilient tabs in the expanded maximum dimension.

12. The system of claim 11 , wherein the one or more resilient tabs are disposed circumferentially around the head portion the head portion contains a relief in between each of the resilient tabs.

13. The system of claim 11 , wherein the insert is threaded into the head portion of the fastener.

14. The system of claim 13 , wherein the insert is configured to threadedly engage the head portion to expand the head portion.

15. The system of claim 14 , wherein the insert contains threads that increase in diameter as the insert is threaded into the head portion.

16. The system of claim 11 , wherein the head portion and the aperture each contain matable curved surfaces to allow for polyaxial movement of the fastener.

17. The system of claim 11 , wherein the one or more resilient tabs are configured to compress inwardly as the head portion enters the aperture.

18. The system of claim 11 , wherein the insert has an upper diameter that is greater than a lower diameter of the insert.

19. The system of claim 11 , wherein the implant comprises at least one of a plate, a rod, a bar, a joint replacement, or an anchoring member.

20. The system of claim 11 , wherein the anchor portion is configured to form or expand an opening in bodily tissue.

Assignees

• Globus Medical Inc

Inventors

• Black Michael
• Hansell Matthew
• Suh Jon

Classifications

• A61B17/8038 Primary

  the additional component being inserted in the screw head · CPC title

• A61B17/8047

  wherein the additional element surrounds the screw head in the plate hole (A61B17/8052 takes precedence) · CPC title

• A61B17/8057

  the interlocking form comprising a thread · CPC title

• A61B17/8605

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

• A61B17/8685

  comprising multiple separate parts · CPC title