Interbody fusion device and system for implantation

Patent metadata

Field	Value
Publication number	US-9949846-B2
Application number	US-201715623463-A
Country	US
Kind code	B2
Filing date	Jun 15, 2017
Priority date	Jun 25, 2015
Publication date	Apr 24, 2018
Grant date	Apr 24, 2018

Abstract

Implant fixation systems, kits and methods for interbody fusions are described herein. Preferably, the implant has a cage containing two deployable blades and one or more strike plates that are able to deploy the blades. The blades are positioned inside the cage such that one blade faces upward and the other blade faces downward. Protrusions on the ends of the blades fit into correspondingly shaped tracks on the interior surface of the cage, allowing movement of the blades inside the cage. The implant also has two wedge-shaped strike plates that fit into attachment regions located on the blades, which allow the strike plates to slide. Impaction of the strike plate(s) causes them to push the blades superiorly or inferiorly. In the impaction position, a portion of the blades protrudes beyond the superior and the inferior surfaces of the cage and fixes the cage in the adjacent vertebral bodies.

First claim

We claim:

1. An implant comprising a body and a bone fixation system,
the body including an interior area disposed between a superior surface and an opposite inferior surface;
the bone fixation system comprising a first blade and a second blade, the first blade and the second blade being disposed within the interior area of the body in an insertion position;
the bone fixation system further comprising a first strike plate, the first strike plate comprises a wedge having a sloped surface;
the bone fixation system further comprising a second strike plate, the second strike plate comprises a wedge having a sloped surface;
wherein the first strike plate and the second strike plate are arranged in the implant such that the sloped surface of the first strike plate and the sloped surface of the second strike plate slope in opposite directions;
wherein the first blade comprises a first blade region and a first support region, the first support region of the first blade having a first attachment region attaching the first blade to the first strike plate; and
wherein the second blade comprises a second blade region and a second support region, the second support region of the second blade having a second attachment region attaching the second blade to the second strike plate.

2. The implant according to claim 1 , wherein the first strike plate includes a right angle that is adjacent to the superior surface; and
wherein the second strike plate includes a right angle that is adjacent to the inferior surface.

3. The implant according to claim 1 , wherein the first strike plate and the second strike plate are configured to be moved in and out of the implant independently of one another.

4. The implant according to claim 1 , wherein the attachment region of the first blade includes a ramp and two side walls and wherein the attachment region of the second blade includes a ramp and two side walls.

5. The implant according to claim 4 , wherein the sloped surface of the first strike plate is configured to slide along the ramp of the attachment region of the first blade to move the first blade from the insertion position to an impaction position;
wherein the sloped surface of the second strike plate is configured to slide along the ramp of the attachment region of the second blade to move the second blade from the insertion position to the impaction position; and
wherein at least a portion of the blade region of the first blade protrudes past the inferior surface of the body in the impaction position and wherein at least a portion of the blade region of the second blade protrudes past the superior surface of the body in the impaction position.

6. The implant according to claim 1 , wherein the sloped surface of the first strike plate includes a strike plate protrusion that fits inside a correspondingly shaped track in the attachment region of the first blade; and
wherein the sloped surface of the second strike plate includes a strike plate protrusion that fits inside a correspondingly shaped track in the attachment region of the second blade.

7. The implant according to claim 6 , wherein the strike plate protrusion has a T-shape.

8. An implant comprising a body and a bone fixation system,
the body including an interior area disposed between a superior surface and an opposite inferior surface;
the bone fixation system comprising at least one blade disposed within the interior area of the body in an insertion position, the at least one blade including a blade region and a support region;
the bone fixation system further including at least one strike plate comprising a wedge having a sloped surface;
the support region of the at least one blade comprising an attachment region attaching the at least one blade to the at least one strike plate;
wherein the attachment region includes a ramp and two side walls; and
wherein the sloped surface of the at least one strike plate is configured to slide along the ramp between the two sidewalls to move the at least one blade from the insertion position to an impaction position, wherein at least a portion of the blade region of the at least one blade protrudes past one of the superior surface and inferior surface of the body in the impaction position.

9. The implant according to claim 8 , wherein the sidewalls include an upper surface that slopes at the same angle as the ramp.

10. The implant according to claim 9 , wherein the at least one strike plate applies a consistent force against the upper surface of the sidewalls of the at least one blade as the at least one strike plate moves the at least one blade from the insertion position to the impaction position.

11. The implant according to claim 9 , wherein the at least one strike plate is configured to apply a force against the upper surface of the sidewalls of the at least one blade as the at least one strike plate is pulled outward from the body of the implant to move the at least one blade from the impaction position to the insertion position.

12. The implant according to claim 8 , wherein the at least one strike plate further comprises an axial slot that is disposed generally parallel to the sloped surface; and
wherein the attachment region of the at least one blade further comprises a pin that fits in and slides along the axial slot of the at least strike plate to attach the at least one blade and the at least one strike plate.

13. The implant according to claim 8 , wherein the sloped surface of the at least one strike plate includes a strike plate protrusion that fits inside a correspondingly shaped track in the attachment region of the at least one blade.

14. The implant according to claim 8 , wherein the at least one blade comprises a first blade and a second blade;
wherein the at least one strike plate comprises a first strike plate and a second strike plate; and
wherein the first strike plate and the second strike plate are arranged in the implant such that the sloped surface of the first strike plate is disposed in an opposite direction from the sloped surface of the second strike plate.

15. The implant according to claim 14 , wherein at least a portion of the blade region of the first blade protrudes past the superior surface of the body in the impaction position and at least a portion of the blade region of the second blade protrudes past the inferior surface of the body in the impaction position.

16. The implant according to claim 15 , wherein the blade region of the first blade is configured to extend back into the interior area of the body when the first strike plate is pulled outwards from the body of the implant; and
wherein the blade region of the second blade is configured to extend back into the interior area of the body when the second strike plate is pulled outwards from the body of the implant.

17. An implant comprising a body and a bone fixation system,
wherein the bone fixation system comprises at least one blade and at least one strike plate;
wherein the at least one strike plate comprises a wedge having a sloped surface;
wherein the at least one blade comprises a blade region and a support region, the support region of the at least one blade having an attachment region attaching the at least one blade to the at least one strike plate; and
wherein the sloped surface of the at least one strike plate is part of a strike plate protrusion that fits inside a correspondingly shaped attachment region track disposed in the support region of the at least one blade.

18. The implant according to claim 17 , wherein the strike plate protrusion has a T-

Assignees

• Inst Musculoskeletal Science & Education Ltd

Inventors

• Duffield William
• Brown Katherine Elizabeth
• Sack James A

Classifications

• A61F2002/30593

  hollow · CPC title

• A61F2/447 Primary

  substantially parallelepipedal, e.g. having a rectangular or trapezoidal cross-section · CPC title

• A61F2220/0008

  Fixation appliances for connecting prostheses to the body · 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

• A61F2/4611 Primary

  of spinal prostheses · CPC title