Expandable interbody implant and methods of use

• US 8,628,578 B2
• Filed: 12/19/2011
• Issued: 01/14/2014
• Est. Priority Date: 12/19/2011
• Status: Active Grant

• Current Assignee: Warsaw Orthopedic Incorporated (Medtronic Plc)
• Original Assignee: Warsaw Orthopedic Incorporated (Medtronic Plc)
• Inventors: Miller, Keith E., Palmatier, Stanley T., Melkent, Anthony J, Armstrong, William D
• Primary Examiner(s): Truong, Kevin T.
• Assistant Examiner(s): SEVILLA, CHRISTIAN ANTHONY
• Application Number:
  US13/329,802
• Publication Number:
  US 20130158663A1
• Time in Patent Office: 757 Days
• Field of Search: 623/17.11, 623/17.15, 623/17.16
• US Class Current: 623/17.16
• CPC Class Codes: A61F 2/30965 Reinforcing the prosthesis by embedding particles or fibres during moulding or dipping
• CPC Class Codes: A61F 2/4425 made of articulated components
• 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 2002/2817 Bone stimulation by chemical reactions or by osteogenic or biological products for enhancing ossification, e.g. by bone morphogenetic or morphogenic proteins [BMP] or by transforming growth factors [TGF]
• 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 2002/30062 (bio)absorbable, biodegradable, bioerodable, (bio)resorbable, resorptive
• CPC Class Codes: A61F 2002/3008 radio-opaque, e.g. radio-opaque markers
• CPC Class Codes: A61F 2002/30092 using shape memory or superelastic materials, e.g. nitinol
• CPC Class Codes: A61F 2002/30166 H-shaped or I-shaped
• CPC Class Codes: A61F 2002/30266 wedge-shaped parallelepipeds
• CPC Class Codes: A61F 2002/30331 made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit
• CPC Class Codes: A61F 2002/3037 Translation along the common longitudinal axis, e.g. piston
• CPC Class Codes: A61F 2002/304 with additional means for limiting said sliding
• CPC Class Codes: A61F 2002/30401 with additional means for preventing or locking said sliding
• CPC Class Codes: A61F 2002/30405 made by screwing complementary threads machined on the parts themselves
• CPC Class Codes: A61F 2002/30433 using additional screws, bolts, dowels, rivets or washers e.g. connecting screws
• CPC Class Codes: A61F 2002/30448 using adhesives
• CPC Class Codes: A61F 2002/30469 using band clamps
• CPC Class Codes: A61F 2002/30471 connected by a hinged linkage mechanism, e.g. of the single-bar or multi-bar linkage type
• CPC Class Codes: A61F 2002/30482 : using a locking cam
• CPC Class Codes: A61F 2002/30492 : using a locking pin
• CPC Class Codes: A61F 2002/30507 : using a threaded locking member, e.g. a locking screw or a set screw
• CPC Class Codes: A61F 2002/30515 : using a locking wedge or block
• CPC Class Codes: A61F 2002/30538 : for adjusting angular orientation
• CPC Class Codes: A61F 2002/30556 : for adjusting thickness
• 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 2002/30601 : telescopic
• CPC Class Codes: A61F 2002/30677 : Means for introducing or releasing pharmaceutical products, e.g. antibiotics, into the body
• CPC Class Codes: A61F 2002/30774 : internally-threaded
• CPC Class Codes: A61F 2002/30777 : Oblong apertures
• CPC Class Codes: A61F 2002/30845 : with cutting edges
• CPC Class Codes: A61F 2002/30878 : with non-sharp protrusions, for instance contacting the bone for anchoring, e.g. keels, pegs, pins, posts, shanks, stems, struts
• CPC Class Codes: A61F 2002/30892 : parallel
• CPC Class Codes: A61F 2002/3092 : having an open-celled or open-pored structure
• CPC Class Codes: A61F 2002/3093 : for promoting ingrowth of bone tissue
• CPC Class Codes: A61F 2220/0016 : with sharp anchoring protrusions, e.g. barbs, pins, spikes
• CPC Class Codes: A61F 2250/0009 : for adjusting thickness
• 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 2310/00029 : Cobalt-based alloys, e.g. Co-Cr alloys or Vitallium
• CPC Class Codes: A61F 2310/00179 : Ceramics or ceramic-like structures
• CPC Class Codes: A61F 2310/00221 : containing calcia or calcium oxide
• CPC Class Codes: A61F 2310/00293 : containing a phosphorus-containing compound, e.g. apatite
• CPC Class Codes: A61F 2310/00359 : Bone or bony tissue
• CPC Class Codes: F04C 2270/041 : Controlled or regulated

Abstract

An intervertebral implant comprises a first component and a second component. The second component includes an actuator and a third component comprises a first ramp and a second ramp axially spaced apart from the first ramp. The third component comprises rails including at least a portion of the ramps. At least one of the ramp portions disposed with the first rail has a first height and at least one of the ramp portions disposed with the second rail has a second height. The first height is greater than the second height. The actuator is engageable with the third component to effect axial translation such that the ramps engage at least one of the components between a first configuration and a second configuration. Methods of use are disclosed.

Claims

1. An intervertebral implant comprising:

a first component comprising an outer tissue engaging surface and an inner surface;

a second component connected to the first component, and being relatively moveable therefrom, the second component comprising an outer tissue engaging surface and an inner surface, the second component including an actuator, the actuator comprising a screw engaged with the second component; and

a third component disposed for engagement and being movable relative to the first and second components, the third component comprising a first ramp and a second ramp axially spaced apart from the first ramp, the third component comprising a first rail including at least a portion of each of the first ramp and the second ramp and a second rail including at least a portion of each of the first ramp and the second ramp, at least one of the ramp portions disposed with the first rail has a first height and at least one of the ramp portions disposed with the second rail has a second height, the first height being greater than the second height,

wherein the actuator is fixedly connected with the third component to effect axial translation of the third component such that the ramps engage the inner surface of one of the first component and the second component to move the components between a first, collapsed configuration and a second, expanded configuration.

2. An intervertebral implant as recited in claim 1, wherein the first rail is disposed relative to the second rail such that the first height and the second height define a lordotic angle in a range of 5 to 30 degrees.

3. An intervertebral implant as recited in claim 1, wherein the third component includes a third ramp axially spaced apart from the second ramp, the first and second rails each including at least a portion of the third ramp.

4. An intervertebral implant as recited in claim 1 wherein the first rail is spaced apart and disposed in a substantially parallel orientation relative to the second rail.

5. An intervertebral implant as recited in claim 1 wherein the first rail is spaced apart and separated from the second rail by an open cavity.

6. An intervertebral implant as recited in claim 1 wherein the first rail is spaced apart and connected to the second rail via a wall disposed therebetween, the wall being configured for connection with the actuator.

7. An intervertebral implant as recited in claim 6 wherein the second component includes a wall that defines a threaded opening configured for engagement with the screw of the actuator.

8. An intervertebral implant as recited in claim 1 wherein at least one of the ramps define an angle of inclination in the range of 5-60 degrees.

9. An intervertebral implant as recited in claim 1 wherein each of the ramps define an angle of inclination in the range of 5-60 degrees.

10. An intervertebral implant as recited in claim 1 wherein the first, second and third components define a bone graft cavity, the bone graft cavity maintaining a substantially constant volume during axial translation.

11. An intervertebral implant as recited in claim 1 wherein the first, second and third components define a bone graft cavity defining an axial length, the axial length decreasing as the first and second components move from the first to the second configuration.

12. An intervertebral implant as recited in claim 1 wherein the first, second and third components define a bone graft cavity, the actuator defining a longitudinal axis such that the actuator is capable of compressing bone graft disposed in the bone graft cavity along the longitudinal axis during axial translation.

13. An intervertebral implant comprising:

a piston component comprising an endplate surface and an inner surface disposed in an opposing orientation relative to the endplate surface, the piston component extending between an anterior end and a posterior end;

a base component comprising an endplate surface and an inner surface disposed in an opposing orientation relative to the endplate surface of the base component, the base component extending between an anterior end and a posterior end, the base component including an actuator, the actuator comprising a screw engaged with the base component;

a wedge disposed for engagement and being movable relative to the piston and base components, the wedge comprising at least a first ramp and a second ramp axially spaced apart from the first ramp, the wedge further comprises an anterior rail including at least a portion of each of the first ramp and the second ramp, and a posterior rail including at least a portion of each of the first ramp and the second ramp, at least one of the ramp portions disposed with the anterior rail has a first height and at least one of the ramp portions disposed with the posterior rail has a second height, the first height being greater than the second height

wherein the actuator is fixedly engaged with the wedge to effect axial translation of the wedge such that the ramps engage the inner surface of the piston component to move the components between a first, collapsed configuration and a second, expanded configuration.

14. An intervertebral implant as recited in claim 13 wherein the anterior rail is disposed relative to the posterior rail such that the first height and the second height define a lordotic angle in a range of 5 to 30 degrees.

15. An intervertebral implant as recited in claim 13 wherein the anterior rail is spaced apart and separated from the posterior rail by an open cavity.

16. An intervertebral implant as recited in claim 13 wherein each of the ramps define an angle of inclination in the range of 5-60 degrees.

17. An intervertebral implant as recited in claim 13 wherein the piston and base components define a bone graft cavity, the bone graft cavity maintaining a substantially constant volume during axial translation.

18. An intervertebral implant as recited in claim 13 wherein the piston, wedge and base components define a bone graft cavity, the actuator defining a longitudinal axis such that the actuator is capable of compressing bone graft disposed in the bone graft cavity along the longitudinal axis during axial translation.