Fixation devices for anterior lumbar or cervical interbody fusion

Patent metadata

Field	Value
Publication number	US-9987142-B2
Application number	US-201314017099-A
Country	US
Kind code	B2
Filing date	Sep 3, 2013
Priority date	Aug 31, 2012
Publication date	Jun 5, 2018
Grant date	Jun 5, 2018

Abstract

Fixation systems, kits and methods for vertebral interbody fusions are provided. The fixation systems fix an intervertebral cage in the spine to resist left to right rotation, flexion and/or extension. In one embodiment, the fixation system contains two keels that are insertable into an attachment portion or an anterior wall of an intervertebral cage. Each keel contains a blade with two flanges, in the shape of half of an I-beam. The attachment portion may be one or more pieces that mate to form the attachment portion, such as an I-beam attachment portion. The blades can be straight or curved. Preferably the fixation systems are modular, allowing for parts to be interchanged to suit the patient's needs. The fixation systems may be provided in a kit, preferably with more than two keels having different sizes and/or shapes, more than one cage, and/or more than one attachment portion.

First claim

I claim:

1. An intervertebral implant, comprising:
a body configured to be inserted between vertebrae; and
a fixation system for insertion into the body of the intervertebral implant, the fixation system including two keels and an attachment portion,
wherein the two keels include a first keel and a second keel,
wherein the first keel includes a first blade having a first side and a second side, and a first pair of flanges extending from the first side of the first blade, such that the first keel has a cross-sectional shape of half of an I-beam,
wherein the second keel includes a second blade having a first side and a second side, and a second pair of flanges extending from the first side of the second blade, such that the second keel has a cross-sectional shape of half of an I-beam,
wherein the attachment portion comprises a central opening configured to receive the keels,
wherein the attachment portion is configured to be received by the body of the intervertebral implant, and
wherein, when the first keel and the second keel are received within the central opening of the attachment portion, a portion of the second side of the first blade is facing and abutting a portion of the second side of the second blade, such that the first pair of flanges extends in an opposite direction than the second pair of flanges.

2. The implant of claim 1 , wherein the keels are straight or curved.

3. The implant of claim 1 , wherein the proximal end of each keel comprises a deformable tab, and wherein the deformable tab is surrounded by a U-shaped channel.

4. The implant of claim 3 , wherein the attachment portion further comprises a protrusion and an opening, wherein the protrusion is configured to push the deformable tab on the keel into the opening.

5. The implant of claim 1 , wherein the attachment portion comprises two pieces, wherein each of the pieces comprises a cavity, wherein each cavity has a suitable shape to receive one keel such that the keel can slide within the cavity.

6. The implant of claim 5 , wherein each cavity is configured to guide the keel to slide at an angle less than 90 degrees relative to a superior or inferior surface of the body of the intervertebral implant.

7. The implant of claim 5 , wherein, the pieces are aligned, each of their cavities align to form the central opening.

8. The implant fixation system of claim 7 , wherein each piece further comprises one or more grooves, wherein the grooves have a suitable shape and size to receive the flanges of one of the keels.

9. The implant of claim 1 , wherein the attachment portion is formed of a first biocompatible material and wherein the body of the implant is formed of a second biocompatible material.

10. The implant of claim 1 , wherein each keel further comprises a keel attachment portion, and wherein the keel attachment portion is configured to be received by an anterior face of the attachment portion when the fixation system is assembled.

11. The implant of claim 1 , wherein the body of the intervertebral implant comprises an open region in a portion of the body, wherein the ends of the open region have a size and shape suitable for receiving the attachment portion.

12. An interbody fusion implant, comprising:
a body configured to be inserted between two bones; and
a fixation system for insertion into the body of the implant, the fixation system including a first keel, a second keel, and an attachment portion;
wherein the first keel includes a first blade having a first side and a second side, and a first pair of flanges extending from the first side of the first blade, such that the first keel has a cross-sectional shape of half of an I-beam;
wherein the second keel includes a second blade having a first side and a second side, and a second pair of flanges extending from the first side of the second blade, such that the second keel has a cross-sectional shape of half of an I-beam;
wherein the attachment portion comprises one or more openings configured to receive the keels;
wherein the attachment portion is configured to be received by the body of the implant; and
wherein the one or more openings of the attachment portion includes one or more cavities having a shape corresponding with, and configured to receive, the half of an I-beam cross-section of the first keel and the half of an I-beam cross-section of the second keel.

13. The implant of claim 12 , wherein the keels are straight or curved.

14. The implant of claim 12 , wherein the attachment portion comprises two pieces; and
wherein each of the two pieces includes a cavity, wherein each cavity has a suitable shape to receive one keel such that the keel can slide within the cavity.

15. The implant of claim 14 , wherein the one or more openings includes a central opening formed by the alignment of cavities within the two pieces of the attachment portion when the two pieces are aligned with one another.

16. The implant of claim 14 , wherein the body of the implant is configured to receive the two pieces of the attachment portion via dovetail joints.

17. An interbody fusion implant, comprising:
a body configured to be inserted between two bones; and
a fixation system for insertion into the body of the implant, the fixation system including a first keel, a second keel, and an attachment portion;
wherein the first keel includes a first blade having a first side and a second side, and a first pair of flanges extending from the first side of the first blade, such that the first keel has a cross-sectional shape of half of an I-beam;
wherein the second keel includes a second blade having a first side and a second side, and a second pair of flanges extending from the first side of the second blade, such that the second keel has a cross-sectional shape of half of an I-beam;
wherein the attachment portion comprises one or more openings configured to receive the keels;
wherein the attachment portion is configured to be received by the body of the implant;
wherein the one or more openings of the attachment portion includes one or more cavities having a shape corresponding with, and configured to receive, the half of an I-beam cross-section of the first keel and the half of an I-beam cross-section of the second keel; and
wherein the one or more cavities are configured to guide the first keel and the second keel to slide at angles of less than 90 degrees relative to a superior surface or an inferior surface of the body of the implant.

18. The implant of claim 17 , wherein the attachment portion comprises two pieces; and wherein each of the two pieces includes a cavity, wherein each cavity has a suitable shape to receive one keel such that the keel can slide within the cavity.

19. The implant of claim 18 , wherein the one or more openings includes a central opening formed by the alignment of cavities within the two pieces of the attachment portion when the two pieces are aligned with one another.

20. The implant of claim 18 , wherein the body of the implant is configured to receive the two pieces of the attachment portion via dovetail joints.

Assignees

• Inst Musculoskeletal Science & Education Ltd

Inventors

• Mcconnell Jeffrey R

Classifications

• A61F2002/30485

  plastically deformable · CPC title

• A61F2002/30383

  made by laterally inserting a protrusion, e.g. a rib into a complementarily-shaped groove · CPC title

• A61F2002/30426

  Bayonet coupling · CPC title

• A61B17/8033

  having indirect contact with screw heads, or having contact with screw heads maintained with the aid of additional components, e.g. nuts, wedges or head covers · CPC title

• A61F2/4455 Primary

  for the fusion of spinal bodies, e.g. intervertebral fusion of adjacent spinal bodies, e.g. fusion cages (intervertebral discs A61F2/442) · CPC title