System and methods for a laterally expanding implant

• US 8,506,635 B2
• Filed: 06/02/2010
• Issued: 08/13/2013
• Est. Priority Date: 06/02/2010
• Status: Active Grant

• Current Assignee: Warsaw Orthopedic Incorporated (Medtronic Plc)
• Original Assignee: Warsaw Orthopedic Incorporated (Medtronic Plc)
• Inventors: Palmatier, Stan, Hugo, Michael, Melkent, Anthony J.
• Primary Examiner(s): Philogene, Pedro
• Assistant Examiner(s): Schneider, Lynnsy
• Application Number:
  US12/792,441
• Publication Number:
  US 20110301712A1
• Time in Patent Office: 1,168 Days
• Field of Search: 623 1711- 1716, 606/90, 606/99, 606/102, 606/86.A
• US Class Current: 623/17.15
• 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 2/4611 of spinal prostheses
• CPC Class Codes: A61F 2002/2835 Bone graft implants for filling a bony defect or an endoprosthesis cavity, e.g. by synthetic material or biological material
• CPC Class Codes: A61F 2002/30266 wedge-shaped parallelepipeds
• 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 2002/30785 parallel
• CPC Class Codes: A61F 2002/30841 Sharp anchoring protrusions for impaction into the bone, e.g. sharp pins, spikes
• CPC Class Codes: A61F 2002/30892 parallel
• CPC Class Codes: A61F 2002/30904 serrated profile, i.e. saw-toothed
• CPC Class Codes: A61F 2002/4619 for extraction
• CPC Class Codes: A61F 2002/4629 connected to the endoprosthesis or implant via a threaded connection
• CPC Class Codes: A61F 2310/00023 Titanium or titanium-based alloys, e.g. Ti-Ni alloys
• CPC Class Codes: A61F 2310/00029 Cobalt-based alloys, e.g. Co-Cr alloys or Vitallium

Abstract

An implant for a spinal column and a method for inserting the same into a patient is disclosed. The implant includes an elongated body positionable in a spinal disc space. The body comprises a first body member and a second body member that each include at least one wedge extending into an interior cavity. A front bracket is connected with a leading portion of the first and second body members and a rear bracket connected with a trailing portion of said first and second body members. The brackets allow the first and second body members to move between an expanded state and an unexpanded state. An expansion component is positioned within the interior cavity when the implant is in an expanded state and the implant is then positioned in an unexpanded state. The expansion component includes at least one inverted wedge in engagement with the wedge of the first and second body members. The inverted wedge is operable to cause the first and second body members to expand way from one another to the expanded state. A bone graft member is then inserted into the interior cavity defined by the first and second body members.

Claims

1. An implant for a spinal column, comprising:

an elongated body positionable in a spinal disc space, said body comprising a first body member and a second body member, said first and second body members including an upper surface and a lower surface, wherein said first and second body members are movable between an expanded state and an unexpanded state;

an expansion component sized and configured to be removably positioned within an interior cavity defined by said first and second body members when in said unexpanded state, said expansion component operable to cause said first and second body members to expand away from one another to said expanded state as said expansion component is removed from the elongated body;

a first bracket, said first and second body members being movably connected with said first bracket via pins positioned in apertures in said first and second body members; and

a second bracket movably connected with said first body and said second body and extending from a proximal end of said first body member to a proximal end of said second body member.

2. The implant for a spinal column of claim 1, further comprising a bone graft member configured to be inserted into said interior cavity defined by said first and second body members when positioned in said expanded state after said expansion component has been removed from said first and second body members.

3. The implant for a spinal column of claim 1, wherein said upper and lower surfaces of said first and second body members include a bone engagement portion selected from the group consisting of grooves, recesses, ridges, serrations, knurlings, spikes, or roughened surfaces.

4. The implant for a spinal column of claim 1, further comprising an upper passage defined in each of said first and second body members and a lower passage in each of said first and second body members.

5. The implant for a spinal column of claim 4, wherein said expansion component includes a base plate having an upper expansion member and a lower expansion member extending horizontally from said base plate, wherein said upper expansion member is movably positioned in said upper passage and said lower expansion member is movably positioned in said lower passage.

6. The implant for a spinal column of claim 1, wherein said first and second body members include at least one wedge extending into said interior cavity, wherein said expansion component includes at least one inverted wedge in engagement with each of said at least one wedges, said at least one inverted wedge configured to apply a lateral force to each of said at least one wedges as said expansion component is retracted out of said first and second body members thereby causing said first and second body members to become oriented in said expanded state.

7. The implant for a spinal column of claim 1, wherein said first bracket extends from a distal end of said first body member to a distal end of said second body member.

8. The implant for a spinal column of claim 7, wherein said distal ends of said first and second body members are tapered and have a recess configured for engagement with said first bracket.

9. The implant for a spinal column of claim 7, wherein said first bracket comprises at least one slot extending between said distal ends of said first and second body members, said pins being positioned in said at least one slot of said first bracket.

10. The implant for a spinal column of claim 1, wherein said second bracket comprises a first arm and a second arm, wherein said first arm is in contact with an inner surface of said first body member and said second arm is in contact with an inner surface of said second body member.

11. An implant for a spinal column, comprising:

an elongated body positionable in a spinal disc space, said elongated body comprising a first body member and a second body member, said first and second body members including an upper surface and a lower surface, said first and second body members each including at least one wedge in contact with and extending from inner surfaces of said first and second body members into an interior cavity defined by said first and second body members;

at least one bracket connected with said first and second body members configured to allow said first and second body members to travel between an expanded state and an unexpanded state;

an expansion component including an upper expansion member and a lower expansion member each having at least one inverted wedge, wherein said expansion component is configured to be positioned in said interior cavity such that a portion of said at least one inverted wedge is in alignment with a portion of said at least one wedge when said first and second body members are positioned in said unexpanded state, wherein as said expansion component is withdrawn from said interior cavity said at least one inverted wedge exerts a lateral force on said at least one wedge in contact with and extending from said inner surfaces of said first and second body members thereby causing said first and second body members to be positioned in said expanded state; and

a bone graft member sized and configured to fit within said interior cavity defined by said first and second body members when positioned in said expanded state, wherein said bone graft member includes a plurality of elongated apertures configured to provide access to said interior cavity for the insertion of bone growth material into said interior cavity.

12. The implant for a spinal column of claim 11, wherein said at least one bracket includes a slot, wherein a first pin is positioned in said slot and connected with said first body member and a second pin is positioned in said slot and connected with said second body member.

13. The implant for a spinal column of claim 11, wherein said at least one wedge of said first and second body members include an upper shelf that engages a portion of said at least one wedge on said upper expansion member and a lower shelf that engages a portion of said at least one inverted wedge on said lower expansion member.

14. The implant for a spinal column of claim 13, further comprising a second bracket extending from a proximal end of said first body member to a proximal end of said second body member, said second bracket comprising a first arm and a second arm, wherein each at least one wedge of said first and second body members comprises a channel between said upper and lower shelves of each at least one wedge, said first and second arms of said second bracket are positioned between said channel of each at least one wedge of said first and second body members.

15. The implant for a spinal column of claim 11, wherein said upper and lower surfaces of said first and second body members include a bone engagement portion.

16. An implant for a spinal column, comprising:

an elongated body positionable in a spinal disc space, said elongated body comprising a first body member and a second body member, said first and second body members including an upper surface and a lower surface, said first and second body members each including at least one wedge extending into an interior cavity defined by said first and second body members;

at least one bracket connected with said first and second body members configured to allow said first and second body members to travel between an expanded state and an unexpanded state;

an expansion component including an upper expansion member and a lower expansion member each having at least one inverted wedge, wherein said expansion component is configured to be positioned in said interior cavity such that a portion of said at least one inverted wedge is in alignment with a portion of said at least one wedge when said first and second body members are positioned in said unexpanded state, wherein as said expansion component is withdrawn from said interior cavity said at least one inverted wedge exerts a lateral force on said at least one wedge thereby causing said first and second body members to be positioned in said expanded state;

a bone graft member sized and configured to fit within said interior cavity defined by said first and second body members when positioned in said expanded state, wherein said bone graft member includes a connector having one or more detents operable to secure said bone graft member to an instrument to secure said bone graft member in said implant once placed in said expanded state.