Intervertebral implants, instruments, and methods

Patent metadata

Field	Value
Publication number	US-11147682-B2
Application number	US-201816124935-A
Country	US
Kind code	B2
Filing date	Sep 7, 2018
Priority date	Sep 8, 2017
Publication date	Oct 19, 2021
Grant date	Oct 19, 2021

Abstract

In accordance with one aspect, a spinal implant for fusing vertebral bones is provided that includes a monolithic body for being inserted between bones. The body has a through opening of the body for receiving bone growth material and a wall of the body extending about the through opening. The wall includes nubs extending into the through opening that increase the surface area of the wall available for bone on-growth.

First claim

What is claimed is:

1. A spinal implant for fusing vertebral bones, the spinal implant comprising:
a monolithic polymer body for being inserted between bones;
a through opening of the body for receiving bone growth material;
a wall of the body extending about the through opening; and
nubs of the wall extending into the through opening for increasing surface area of the wall available for bone on-growth,
the nubs having surfaces that include nanostructures comprising peaks and valleys to encourage bone fusion interaction in the through opening of the body;
wherein the body includes an attachment member outward of the wall;
opposite lateral sides of the attachment member;
recesses of the body extending along the opposite lateral sides of the attachment member configured to receive distal end portions of clamping arms of an inserter tool that clamp the opposite lateral sides of the attachment member therebetween;
a narrower portion of the attachment member adjacent the wall, the narrower portion including a first pair of opposite side surface portions having a first width therebetween across the attachment member; and
a wider portion of the attachment member spaced from the wall with the narrower portion intermediate the wider portion and the wall along the attachment member, the wider portion including a second pair of opposite side surface portions with a second width therebetween across the attachment member that is larger than the first width, the wider portion configured to be interference with the distal end portions of the clamping arms to inhibit separation of the polymer body from the inserter tool while the clamping arms clamp the attachment member therebetween.

2. The spinal implant of claim 1 wherein the wall includes a plurality of intersecting pathways for the bone growth material that separate the nubs.

3. The spinal implant of claim 1 wherein the wall includes an upper bone engaging portion and a lower bone engaging portion and the wall includes pathways extending from the upper bone engaging portion to the lower bone engaging portion.

4. The spinal implant of claim 1 wherein the wall includes a base surface separating the nubs and each nub has a continuous side surface projecting from the base surface and defining an outer periphery of the nub spaced from the continuous side surface of adjacent nubs.

5. The spinal implant of claim 4 wherein the continuous side surface of each nub includes at least three side wall surface portions connected by edges of the nub.

6. The spinal implant of claim 1 wherein the body is of polyetherketoneketone (PEKK) and the body is fabricated using selective laser sintering.

7. The spinal implant of claim 1 wherein the nubs each have a diamond shape.

8. The spinal implant of claim 1 wherein the wall includes an inner surface that includes the nubs and an outer surface opposite the inner surface and the outer surface includes a plurality of secondary nubs.

9. The spinal implant of claim 8 wherein the nubs and the secondary nubs each have a diamond shape.

10. The spinal implant of claim 1 wherein the wall of the body includes wall portions extending along opposite sides of the through opening, the wall portions each having an upper bone-engaging portion and a lower bone-engaging portion;
a web of the body interconnecting the wall portions and extending across the through opening;
uppermost and lowermost portions of the web that are recessed relative to the corresponding upper and lower bone-engaging portions of the wall to avoid contact between the web and the bones during insertion of the implant into a space between the vertebral bones.

11. The spinal implant of claim 10 wherein the wall portions each include nubs above and below the web.

12. The spinal implant of claim 1 wherein the peaks and valleys of the nanostructures have an average peak-to-valley distance of approximately 125-129 nanometers.

13. The spinal implant of claim 1 wherein the peaks of the nanostructures have an average peak-to-peak distance of approximately 265-282 nanometers.

14. The spinal implant of claim 1 wherein the body has an upper bone-engaging portion and a lower bone-engaging portion; and
wherein the nubs each include a pair of upper straight side walls extending transverse to one another and a pair of lower straight side walls extending transverse to one another.

15. The spinal implant of claim 1 wherein the monolithic polymer body is of polyetherketoneketone (PEKK).

16. The spinal implant of claim 1 wherein the monolithic polymer body is of polyetheretherketone (PEEK).

17. An implant for being inserted into an intervertebral space between vertebrae to stabilize the vertebrae, the implant comprising:
a monolithic body of polyetherketoneketone (PEKK), the body being fabricated using selective laser sintering;
a through opening of the body for receiving bone growth material;
an annular wall of the body extending about the through opening and having upper and lower bone engaging portions;
the annular wall being free of through apertures in communication with the through opening;
an attachment member of the body outward of the annular wall;
recesses of the body extending along opposite sides of the attachment member configured to receive distal end portions of clamping arms of an inserter tool that clamp the opposite sides of the attachment member therebetween;
a narrower portion of the attachment member adjacent the annular wall, the narrower portion including a first pair of opposite side surface portions having a first width therebetween across the attachment member; and
a wider portion of the attachment member spaced from the annular wall with the narrower portion intermediate the wider portion and the annular wall along the attachment member, the wider portion including a second pair of opposite side surface portions with a second width therebetween across the attachment member that is larger than the first width, the wider portion of the attachment member configured to be in interference with the distal end portions of the clamping arms to inhibit separation of the body from the inserter tool while the clamping arms clamp the attachment member therebetween.

18. The implant of claim 17 wherein the body has a leading end portion and a trailing end portion and a longitudinal axis extending therebetween and the attachment member includes a boss that increases the axial length of the attachment member for being engaged by the inserter tool.

19. The implant of claim 17 wherein the attachment member includes ramp surfaces at the opposite sides of the attachment member that define at least a portion of the recesses and extend transverse to each other, the ramp surfaces configured so that the body shifts toward the inserter tool as the clamping arms clamp the attachment member.

20. The implant of claim 17 wherein the attachment member includes lateral cavities at the opposite sides of the attachment member that receive projections of the inserter instrument clamping arms.

21. The implant of claim 17 wherein the attachment member is unthreaded.

22. The implant of claim 17 wherein the annular wall has an inner surface extending along the throughbore and an outer surface opposite the inner surface, and the annular wall has a minimum thickness between the inner and outer surfaces thereof of at least approximately 0.06 inches throughout the entire wall.

23. The implant of claim 17 wherein the body includes p

Assignees

• Pioneer Surgical Tech Inc

Inventors

• Trudeau Jeffrey L
• Kakuk Michael D
• Horvath Stephen John
• Barron Katie S
• Carter Michael Sibley
• Skaw Brent E

Classifications

• A61F2002/30892

  parallel · CPC title

• A61F2002/30807

  Plurality of blind bores · CPC title

• A61F2002/2835

  Bone graft implants for filling a bony defect or an endoprosthesis cavity, e.g. by synthetic material or biological material · CPC title

• A61F2/30771

  applied in original prostheses, e.g. holes or grooves · CPC title

• A61F2002/30904

  serrated profile, i.e. saw-toothed · CPC title