Expandable fusion device and method of installation thereof

• US 8,679,183 B2
• Filed: 04/05/2012
• Issued: 03/25/2014
• Est. Priority Date: 06/25/2010
• Status: Active Grant

• Current Assignee: Globus Medical, Inc.
• Original Assignee: Globus Medical, Inc.
• Inventors: Glerum, Chad, Weiman, Mark
• Primary Examiner(s): Manahan, Todd
• Assistant Examiner(s): Weiss, Jessica
• Application Number:
  US13/440,158
• Publication Number:
  US 20120265309A1
• Time in Patent Office: 719 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 2/447 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 2002/30207 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 2002/30482 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 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 expandable device comprising:

a first endplate;

a second endplate;

a body portion that extends along at least a length of the first endplate and the second endplate;

a translation member receivable within the body portion in between the first endplate and the second endplate,

the translation member including a recess for receiving an insert therein and at least two ramped surfaces, wherein the at least two ramped surfaces are sloped generally in a same direction, and wherein the first endplate includes grooves that correspond with the at least two ramped surfaces;

an actuation member insertable through the body portion, wherein the actuation member is in contact with the insert,

wherein the insert is positioned between the translation member and the actuation member, and wherein the actuation member is configured with a proximal end and a distal end, the distal end having a distal most face in contact with the insert.

2. The device of claim 1, wherein the insert is of a different material from the translation member.

3. The device of claim 2, wherein the insert is formed of PEEK and the translation member is formed of metal.

4. The device of claim 1, wherein the insert is of a different material from the actuation member.

5. The device of claim 4, wherein the insert is formed of PEEK and the actuation member is formed of metal.

6. The device of claim 1, wherein the actuation member comprises a threaded set screw.

7. An expandable device comprising:

a first endplate;

a second endplate;

a body portion that extends along at least a length of the first endplate and the second endplate;

a translation member receivable within the body portion in between the first endplate and the second endplate;

the translation member including at least two ramped surfaces, wherein the at least two ramped surfaces are sloped generally in a same direction, and wherein the first endplate includes grooves that correspond with the at least two ramped surfaces;

an actuation member insertable through the body portion, wherein the actuation member is configured to transmit a force to the translation member; and

an insert positioned between the translation member and the actuation member wherein the actuation member is configured with a proximal end and a distal end, the distal end having a distal most face in contact with the insert.

8. The device of claim 7, wherein the insert in PEEK.

9. The device of claim 7, wherein the insert comprises a wedge member.

10. The device of claim 7, wherein the material of the insert is different from the material of the actuation member.

11. The device of claim 7, wherein the first endplate includes a textured outer surface for contacting a vertebral body.

12. The device of claim 7, wherein the second endplate includes a textured outer surface for contacting a vertebral body.

13. An expandable device comprising:

a first endplate;

a second endplate;

a body portion that extends along at least a length of the first endplate and the second endplate;

a translation member receivable within the body portion in between the first endplate and the second endplate;

the translation member including at least two ramped surfaces, wherein the at least two ramped surfaces are sloped generally in a same direction, and wherein the first endplate includes grooves that correspond with the at least two ramped surfaces;

an actuation member insertable through the body portion, wherein rotational movement of the actuation member transmits a force to the actuation member;

and an insert positioned between the translation member and the actuation member, wherein the insert is of a different material from both the translation member and the actuation member, and wherein the actuation member is configured with a proximal end and a distal end, the distal end having a distal most face in contact with the insert.

14. The device of claim 13, wherein the actuation member comprises a threaded set screw.

15. The device of claim 13, wherein the insert is configured to fit in a recess formed in the translation member.

16. The device of claim 13, wherein the insert is ring-shaped.