Expandable fusion device and method of installation thereof

• US 8,556,979 B2
• Filed: 04/19/2012
• Issued: 10/15/2013
• Est. Priority Date: 10/15/2009
• Status: Active Grant

• Current Assignee: Globus Medical, Inc.
• Original Assignee: Globus Medical, Inc.
• Inventors: Glerum, Chad, Suh, Sean, Weiman, Mark
• Primary Examiner(s): Manahan, Todd
• Assistant Examiner(s): Weiss, Jessica
• Application Number:
  US13/451,097
• Publication Number:
  US 20130006361A1
• Time in Patent Office: 544 Days
• Field of Search: 623 1711- 1716, 411/75, 411/80, 403/297, 403373-3744, 254/11
• US Class Current: 623/17.16
• CPC Class Codes: A61F 2/4455 for the fusion of spinal bodies, e.g. intervertebral fusion of adjacent spinal bodies, e.g. fusion cages intervertebral discs A61F2/442
• CPC Class Codes: A61F 2/447 substantially parallelepipedal, e.g. having a rectangular or trapezoidal cross-section
• CPC Class Codes: A61F 2/4684 Trial or dummy prostheses
• CPC Class Codes: A61F 2002/30148 lozenge- or diamond-shaped
• CPC Class Codes: A61F 2002/30207 Double convex cones, i.e. element having two convex cones, one at each of its opposite ends
• CPC Class Codes: A61F 2002/3021 frustoconical
• CPC Class Codes: A61F 2002/30265 Flat parallelepipeds
• CPC Class Codes: A61F 2002/30365 with additional means for limiting said rotation
• CPC Class Codes: A61F 2002/30367 with additional means for preventing said rotation
• CPC Class Codes: A61F 2002/30372 with additional means for limiting said translation
• CPC Class Codes: A61F 2002/30373 with additional means for preventing said translation
• CPC Class Codes: A61F 2002/30387 Dovetail connection
• CPC Class Codes: A61F 2002/30405 made by screwing complementary threads machined on the parts themselves
• CPC Class Codes: A61F 2002/30482 using a locking cam
• CPC Class Codes: A61F 2002/30484 Mechanically expandable devices located on the first prosthetic part for locking into or onto the second prosthetic part
• CPC Class Codes: A61F 2002/30492 using a locking pin
• CPC Class Codes: A61F 2002/30495 using a locking ring
• CPC Class Codes: A61F 2002/30507 using a threaded locking member, e.g. a locking screw or a set screw
• CPC Class Codes: A61F 2002/30517 using a locking plate
• CPC Class Codes: A61F 2002/3052 unrestrained in only one direction, e.g. moving unidirectionally
• CPC Class Codes: A61F 2002/30523 : by means of meshing gear teeth
• CPC Class Codes: A61F 2002/3055 : for adjusting length
• CPC Class Codes: A61F 2002/30556 : for adjusting thickness
• CPC Class Codes: A61F 2002/30578 : having apertures, e.g. for receiving fixation screws
• CPC Class Codes: A61F 2002/30579 : with mechanically expandable devices, e.g. fixation devices
• CPC Class Codes: A61F 2002/30593 : hollow
• CPC Class Codes: A61F 2002/30594 : slotted, e.g. radial or meridian slot ending in a polar aperture, non-polar slots, horizontal or arcuate slots
• CPC Class Codes: A61F 2002/30601 : telescopic
• CPC Class Codes: A61F 2002/30841 : Sharp anchoring protrusions for impaction into the bone, e.g. sharp pins, spikes
• CPC Class Codes: A61F 2002/30904 : serrated profile, i.e. saw-toothed
• CPC Class Codes: A61F 2250/0004 : adjustable
• CPC Class Codes: A61F 2310/00017 : Iron- or Fe-based alloys, e.g. stainless steel
• CPC Class Codes: A61F 2310/00023 : Titanium or titanium-based alloys, e.g. Ti-Ni alloys
• CPC Class Codes: A61F 2310/00179 : Ceramics or ceramic-like structures

Abstract

The present invention provides an expandable fusion device capable of being installed inside an intervertebral disc space to maintain normal disc spacing and restore spinal stability, thereby facilitating an intervertebral fusion. In one embodiment, the fusion device includes a body portion, a first endplate, and a second endplate, the first and second endplates capable of being moved in a direction away from the body portion into an expanded configuration or capable of being moved towards the body portion into an unexpanded configuration. The fusion device is capable of being deployed and installed in both configurations.

Claims

1. An intervertebral implant comprising:

a first endplate having an upper side and a lower side, the upper side of the first endplate including a textured surface;

a second endplate having an upper side and a lower side, the lower side of the second endplate including a textured surface;

a body portion having a first end, a second end, a first side portion connecting the first end and the second end, and a second side portion connecting the first end and the second end;

a translation member received between the first endplate and the second endplate, the translation member including at least two first angled surfaces of which at least one of the two first angled surfaces is configured to engage a contact surface of the first endplate and at least two second angled surfaces of which at least one of the two second angled surfaces is configured to engage a contact surface of the second endplate, wherein the at least two first angled surfaces are separated via a bridge that extends along a longitudinal length of the translation member,

wherein movement of the translation member causes at least one of the two first angled surfaces to push against the contact surface of the first endplate and at least one of the two second angled surfaces to push against the contact surface of the second endplate, thereby causing outward expansion of the first endplate and second endplate, wherein the at least two first angled surfaces are sloped generally in a same direction.

2. The implant of claim 1, further comprising an actuation member engaged with the translation member.

3. The implant of claim 2, wherein the actuation member comprises a threaded member.

4. The implant of claim 2, wherein rotation of the actuation member causes translational movement of the translation member.

5. The implant of claim 1, wherein the first endplate includes a pair of ramped surfaces.

6. The implant of claim 1, wherein the translation member comprises a pair of ramped surfaces connected by a bridge portion.

7. The implant of claim 1, wherein the translation member includes a central opening.

8. The implant of claim 1, wherein the contact surfaces of the first and second endplates comprise dovetail grooves.

9. The implant of claim 1, further comprising a PEEK interference nut positioned within a rear section of the body portion.

10. An intervertebral implant comprising:

a first endplate having an upper side and a lower side, wherein the first endplate includes a first opening configured to receive bone graft material;

a second endplate having an upper side and a lower side, wherein the second endplate includes a second opening configured to receive bone graft material;

a body portion having a first end, a second end, a first side portion connecting the first end and the second end, and a second side portion connecting the first end and the second end; and

a translation member receivable in the body portion, the translation member including at least two first angled surfaces of which at least one of the two first angled surfaces is configured to engage a surface of the first endplate and at least two second angled surfaces of which at least one of the two second angled surfaces is configured to engage a surface of the second endplate, wherein the at least two first angled surfaces are separated via a bridge that extends along a longitudinal length of the translation member, wherein the at least two first angled surfaces are sloped generally in a same direction.

11. The implant of claim 10, wherein movement of the translation member causes the first angled surface to push against the surface of the first endplate and the second angled surface to push against the surface of the second endplate, thereby causing outward expansion of the first endplate and second endplate.

12. The implant of claim 10, wherein the body portion includes a first end having at least one angled surface to assist in distraction of vertebral bodies.

13. The implant of claim 10, wherein the first endplate includes at least two ramped surfaces.

14. The implant of claim 10, wherein each of the slopes of the at least two ramped surfaces is different from one another.

15. The implant of claim 10, further comprising an actuation member engaged with the translation member.

16. The implant of claim 10, wherein the surface of the first endplate comprises a dovetail groove for receiving a complementary portion of the translation member.

17. An intervertebral implant comprising:

a first endplate having an upper side and a lower side, wherein the upper side of the first endplate includes a textured surface for engaging a first vertebral body, and wherein the first endplate includes a first opening configured to receive bone graft material;

a second endplate having an upper side and a lower side, wherein the lower side of the second endplate includes a textured surface for engaging a second vertebral body, and wherein the second endplate includes a second opening configured to receive bone graft material;

a body portion having a first end, a second end, a first side portion connecting the first end and the second end, and a second side portion connecting the first end and the second end; and

a translation member including at least two first angled surfaces of which at least one of the two first angled surfaces is configured to engage a ramped surface of the first endplate and at least two second angled surfaces of which at least one of the two second angled surfaces is configured to engage a ramped surface of the second endplate, wherein the at least two first angled surfaces are separated via a bridge that extends along a longitudinal length of the translation member, wherein the at least two first angled surfaces are sloped generally in a same direction.

18. The implant of claim 17, wherein movement of the translation member causes the first angled surface to push against the ramped surface of the first endplate and the second angled surface to push against the ramped surface of the second endplate, thereby causing outward expansion of the first endplate and second endplate.

19. The implant of claim 17, wherein the first endplate comprises a dovetail groove for receiving a portion of the translation member.