Adjustable distraction cage with linked locking mechanisms

• US 10,342,673 B2
• Filed: 12/13/2016
• Issued: 07/09/2019
• Est. Priority Date: 02/22/2008
• Status: Active Grant

• Current Assignee: Howmedica Osteonics Corp. (Stryker Corporation)
• Original Assignee: Howmedica Osteonics Corp. (Stryker Corporation)
• Inventors: Ashley, John E., Simpson, Philip J., Gillespie, Walter Dean, Kadaba, Murali, Matsuura, David G., Mansfield, III, George A., Grotz, Thomas, Pretti, Rudy
• Primary Examiner(s): Stewart, Alvin J
• Application Number:
  US15/377,377
• Publication Number:
  US 20170224506A1
• Time in Patent Office: 938 Days
• Field of Search: 623 1711- 1716
• CPC Class Codes: A61F 2/30742 Bellows or hose-like seals; Sealing membranes A61B17/8808 takes precedence; sealing membranes for retaining bone substitute A61F2/2846
• CPC Class Codes: A61F 2/441 made of inflatable pockets or chambers filled with fluid, e.g. with hydrogel
• CPC Class Codes: A61F 2/442 Intervertebral or spinal discs, e.g. resilient non-disc-shaped intervertebral inflatable pockets A61F2/441; non-disc-shaped intervertebral fusion implants A61F2/4455
• 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 2/4465 having a circular or kidney shaped cross-section substantially perpendicular to the axis of the spine
• CPC Class Codes: A61F 2/4611 of spinal prostheses
• CPC Class Codes: A61F 2/48 Operating or control means, e.g. from outside the body, control of sphincters
• CPC Class Codes: A61F 2/482 Electrical means
• CPC Class Codes: A61F 2/484 Fluid means, i.e. hydraulic or pneumatic
• CPC Class Codes: A61F 2002/30079 magnetic
• CPC Class Codes: A61F 2002/3008 radio-opaque, e.g. radio-opaque markers
• CPC Class Codes: A61F 2002/30133 kidney-shaped or bean-shaped
• CPC Class Codes: A61F 2002/30365 with additional means for limiting said rotation
• CPC Class Codes: A61F 2002/30405 made by screwing complementary threads machined on the parts themselves
• CPC Class Codes: A61F 2002/30476 locked by an additional locking mechanism
• 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 2002/30495 using a locking ring
• CPC Class Codes: A61F 2002/30505 spring biased
• CPC Class Codes: A61F 2002/30514 using a locking washer
• CPC Class Codes: A61F 2002/30522 releasable, e.g. using a releasable ratchet
• CPC Class Codes: A61F 2002/30525 : Worm gears
• CPC Class Codes: A61F 2002/3055 : for adjusting length
• CPC Class Codes: A61F 2002/30556 : for adjusting thickness
• CPC Class Codes: A61F 2002/30565 : having spring elements
• CPC Class Codes: A61F 2002/30579 : with mechanically expandable devices, e.g. fixation devices
• CPC Class Codes: A61F 2002/30581 : having a pocket filled with fluid, e.g. liquid
• CPC Class Codes: A61F 2002/30589 : Sealing means
• 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 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

Abstract

A spinal implant which is configured to be deployed between adjacent vertebral bodies. The implant has at least one extendable support element with a retracted configuration to facilitate deployment of the implant and an extended configuration so as to expand the implant and effectively distract the disc space, stabilize the motion segments and eliminate pathologic spine motion. The implant has a minimal dimension in its unexpanded state that is smaller than the dimensions of the neuroforamen through which it typically passes to be deployed within the intervertebral space. The implant is provided with a locking system having a plurality of linked locking elements that work in unison to lock the implant in an extended configuration. Bone engaging anchors also may be provided to ensure secure positioning.

Claims

1. A method for stabilizing a spine in a patient'"'"'s body, comprising:

implanting an expandable fusion implant into an intervertebral space between a first vertebral body and a second vertebral body of the spine;

expanding the implant to an expanded configuration by;

moving a first portion of the implant in a lateral dimension such that the width of the implant is increased, and,

independently of the step of moving the first portion of the implant in the lateral dimension, actuating at least one extendable support element of the implant to drive a first vertebral engagement surface away from an opposing second vertebral engagement surface in a superior/inferior dimension such that the height of the implant is increased, wherein the at least one expandable support element is a permanently integral component of the implant that remains implanted in the intervertebral space with the implant; and

locking the implant in the expanded configuration so as to fix the positions and orientations of the first and second vertebral engagement surfaces relative to one another.

2. The method of claim 1, wherein actuating the at least one extendable support element includes extending a piston outwardly from a cylinder of the implant.

3. The method of claim 1, wherein actuating the at least one extendable support element includes extending a first extendable support element and a second extendable support element outwardly from a housing of the implant.

4. The method of claim 1, further comprising locking the implant so as to restrain the width of the implant from decreasing.

5. The method of claim 1, wherein moving the first portion of the implant in the lateral dimension includes extending a piston outwardly from a cylinder of the implant.

6. The method of claim 5, wherein a housing of the implant includes a central member that provides the cylinder and receives the piston.

7. The method of claim 1, wherein moving the first portion of the implant in the lateral dimension includes extending a lateral anchor outwardly from a housing of the implant so as to anchor the lateral anchor in laterally oriented tissue of the patient'"'"'s body.

8. The method of claim 1, further comprising extending at least one bone anchor outwardly from a housing of the implant, the at least one bone anchor having a sharp tip for firmly engaging at least one of the first and second vertebral bodies.

9. The method of claim 1, wherein the step of actuating the at least one extendable support element to drive the first vertebral engagement surface away from the second vertebral engagement surface causes the first vertebral body to distract away from the second vertebral body.

10. The method of claim 1, further comprising filling an interior cavity of the implant with bone graft material.

11. A device for stabilizing a spine of a patient'"'"'s body, comprising:

an expandable fusion implant adapted to be implanted into an intervertebral space between a first vertebral body and a second vertebral body of the spine, the implant including a first vertebral engagement surface adapted to engage the first vertebral body and an opposing second vertebral engagement surface adapted to engage the second vertebral body, and the implant being expandable to an expanded configuration by increasing the width of the implant and increasing the height of the implant;

wherein a first portion of the implant is movable in a lateral dimension such that the width of the implant is increased;

wherein the implant includes at least one extendable support element actuatable to drive the first vertebral engagement surface away from the second vertebral engagement surface in a superior/inferior dimension such that the height of the implant is increased, the at least one extendable support element being actuatable to drive the first vertebral engagement surface away from the second vertebral engagement surface independently of movement of the first portion in the lateral dimension, and the at least one extendable support element being a permanently integral component of the implant that remains implanted in the intervertebral space with the implant; and

wherein the implant is lockable in the expanded configuration so as to fix the positions and orientations of the first and second vertebral engagement surfaces relative to one another.

12. The device of claim 11, wherein the at least one extendable support element includes a piston adapted to extend outwardly from a cylinder of the implant in the superior/inferior dimension.

13. The device of claim 11, wherein the at least one extendable support element includes a first extendable support element and a second extendable support element, both the first and second extendable support elements being adapted to extend outwardly from a housing of the implant.

14. The device of claim 11, further comprising a locking mechanism adapted to lock the first portion of the implant so as to restrain the width of the implant from decreasing.

15. The device of claim 11, wherein the first portion of the implant includes a piston adapted to extend outwardly from a cylinder of the implant in the lateral dimension.

16. The device of claim 15, wherein a housing of the implant includes a central member that provides the cylinder and receives the piston.

17. The device of claim 16, wherein the central member divides an interior cavity of the housing into two cavities.

18. The device of claim 11, wherein the first portion of the implant includes a lateral anchor extendable outwardly from a housing of the implant in the lateral dimension so as to anchor the lateral anchor in laterally oriented tissue of the patient'"'"'s body.

19. The device of claim 11, further comprising at least one bone anchor extendable outwardly from a housing of the implant in the superior/inferior dimension, the at least one bone anchor having a sharp tip for firmly engaging at least one of the first and second vertebral bodies.

20. The device of claim 19, wherein the at least one bone anchor is formed as a spike.