Interbody fusion device and system for implantation

Patent metadata

Field	Value
Publication number	US-2016374831-A1
Application number	US-201615194323-A
Country	US
Kind code	A1
Filing date	Jun 27, 2016
Priority date	Jun 25, 2015
Publication date	Dec 29, 2016
Grant date	—

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,
wherein the body comprises an interior surface and an exterior surface, and wherein the bone fixation system comprises one or more blades and one or more strike plates; wherein each of the blades comprises a blade region and a support region, wherein the support region comprises an outer surface, an inner surface, two ends and one or more attachment regions for attaching to the one or more strike plates.

2 . The implant of claim 1 , wherein the one or more attachment regions comprise a ramp and two side walls.

3 . The implant of claim 1 , wherein each end of the support region contains an end protrusion,
wherein the interior surface of the body contains tracks that align with each end protrusion, and wherein each end protrusion has a suitable size and shape to fit in one of the tracks in sliding relation thereto.

4 . The implant of claim 3 , wherein the end protrusion has a cross sectional shape selected from the group consisting of dovetails, T-shapes, C-shapes, I-shapes, polygons, rectangles, segments of a circle, and other symmetric or asymmetric shapes.

5 . The implant of claim 3 , wherein each of the tracks has a cross section in a shape that corresponds with the shape of the cross section of the protrusion.

6 . The implant of claim 3 , wherein the end protrusions have cross-sections in the shape of a dovetail, Wherein the tracks have cross sections in the shape of a dovetail.

7 . The implant of claim , wherein each strike plate comprises a hypotenuse surface that contacts and slides along the ramp in the attachment region of the blade when the strike plate is pushed.

8 . The implant of claim 7 , wherein the strike plate fu her comprises a slot adjacent to the hypotenuse surface and generally parallel with the hypotenuse surface.

9 . The implant of claim 8 , wherein the attachment region further comprises a pin, wherein each end of the pin attaches to one of the side walls of the attachment region, and wherein the pin is inside the slot and allows the slot to slide along the pin when the strike plate is pushed.

10 . The implant of claim 2 , Wherein the ramp and side walls define a channel in an attachment region track.

11 . The implant of claim 10 , wherein the strike plate further comprises a strike plate protrusion comprising the hypotenuse surface, and wherein the strike plate protrusion has across sectional shape that is the same as the cross sectional shape of the channel in the attachment region track.

12 . The implant of claim 11 , wherein the strike plate protrusion has a cross section in a shape selected from the group consisting of dovetails, T-shapes, C-shapes, I-shapes, polygons, rectangles, segments of a circle, and other symmetric or asymmetric shapes.

13 . The implant of claim 12 , wherein the cross section of the strike plate protrusion is T-shaped, and wherein the cross section of the channel in attachment region track is T-shaped.

14 . The implant of claim 1 , wherein the fixation system comprises two strike plates and two blades.

15 . The implant of claim 1 , wherein the support region of each blade is inside the implant regardless of the position of the strike plate.

16 . The implant of claim 1 , wherein the implant is a lateral lumbar interbody fusion (lateral LIF) implant.

17 . The implant of claim 1 , wherein the implant is an anterior lumbar interbody fusion (ALIF) implant.

18 . The implant of claim 1 , wherein the body of the implant comprises a superior surface and an inferior surface, and wherein the blades are able to move from a first, insertion position, where the blade region of each of the blades is inside the implant, to a second, impaction position, where the blade region of each of the blades protrudes beyond the superior or inferior surface of the implant.

19 . The implant of claim 1 , further comprising a cover plate attached to the exterior surface of the body of the implant, wherein the cover plate retains the strike plates in a position and prevents the strike plates from sliding to a different position.

20 . The implant of claim 1 , wherein the strike plates further comprise an insertion region configured to mate with a portion of an insertion device to facilitate movement of the strike plates.

21 . A kit comprising the implant of claim 1 and a cover plate.

22 . The kit of claim 21 , further comprising an insertion tool configured to push the strike plates into an impaction position, wherein in the impaction position the strike plates push blades until the blade region of each blade protrudes beyond the superior or inferior surface of the implant.

23 . A method of using the implant of claim 1 , comprising
a) inserting the implant into a disc space in the spine of a patient; and b) impacting the one or more strike plates, thereby forcing the one or more blades to be deployed superiorly and/or inferiorly so that they protrude beyond the superior or inferior surface of the implant.

24 . The method of claim 23 , wherein during step a), the fixation system is in an insertion position, wherein the one or more strike plates extend beyond one side of the exterior surface of the implant and wherein the blade portions of each of the one or more blades are inside of the implant.

25 . The method of claim 23 , wherein prior to step a), the implant is Idled internally with bone graft.

26 . The method of claim 23 , wherein the implant is attached onto an insertion tool prior to step a).

27 . The method of claim 23 , further comprising attaching a cover plate to the exterior surface on an anterior or lateral side of the implant following step b).

28 . The method of claim 23 , further comprising, following step b), removal of the implant by pulling the strike plates into the insertion position and retracting the blades inside the implant.

Assignees

• Inst Musculoskeletal Science & Education Ltd

Inventors

• Duffield William
• Brown Katherine Elizabeth
• Sack James A

Classifications

• A61F2002/30593

  hollow · CPC title

• A61F2002/30579

  with mechanically expandable devices, e.g. fixation devices · 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

• A61F2220/0008

  Fixation appliances for connecting prostheses to the body · CPC title

• A61F2/4611 Primary

  of spinal prostheses · CPC title