Variable lordosis spacer and related methods of use

• US 9,662,224 B2
• Filed: 10/20/2015
• Issued: 05/30/2017
• Est. Priority Date: 02/07/2014
• Status: Active Grant

• Current Assignee: Globus Medical, Inc.
• Original Assignee: Globus Medical, Inc.
• Inventors: Weiman, Mark, Gahman, Kevin, Burkhardt, Alex, Glerum, Chad
• Primary Examiner(s): PLIONIS, NICHOLAS J
• Application Number:
  US14/887,476
• Publication Number:
  US 20160038305A1
• Time in Patent Office: 588 Days
• Field of Search: 623 1711- 1716
• CPC Class Codes: A61F 2/30767 Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
• CPC Class Codes: A61F 2/3094 Designing or manufacturing processes
• 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 2/4425 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 2/4611 of spinal prostheses
• 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 2002/30266 wedge-shaped parallelepipeds
• CPC Class Codes: A61F 2002/30405 made by screwing complementary threads machined on the parts themselves
• CPC Class Codes: A61F 2002/30411 having two threaded end parts connected by a threaded central part with opposite threads at its opposite ends, i.e. for adjusting the distance between both end parts by rotating the central part
• 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 2002/30538 for adjusting angular orientation
• CPC Class Codes: A61F 2002/30556 for adjusting thickness
• CPC Class Codes: A61F 2002/30593 hollow
• CPC Class Codes: A61F 2002/30601 telescopic
• CPC Class Codes: A61F 2002/30828 parallel
• CPC Class Codes: A61F 2002/30843 Pyramidally-shaped
• CPC Class Codes: A61F 2002/30904 : serrated profile, i.e. saw-toothed
• CPC Class Codes: A61F 2002/30953 : using a remote computer network, e.g. Internet
• CPC Class Codes: A61F 2310/00011 : Metals or alloys
• 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
• CPC Class Codes: A61F 2310/00407 : Coating made of titanium or of Ti-based alloys
• CPC Class Codes: A61F 2310/00796 : Coating or prosthesis-covering structure made of a phosphorus-containing compound, e.g. hydroxy(l)apatite

Abstract

An expandable fusion device may include a first endplate and a second endplate. The expandable fusion device may also include first and second ramps configured to mate with both the first and second endplates. An inserter instrument includes an outer shaft having a bore extending longitudinally therethrough and an inner shaft extending through the bore in the outer shaft. The outer shaft is configured to engage the first or second opening in the second ramp, and the inner shaft is configured to engage the corresponding first or second opening in the first ramp to control implant height and/or lordotic angle.

Claims

1. A system comprising:

an expandable fusion device comprising;

a first endplate having an upper surface defining a first plane extending from a first side of the expandable fusion device to a second side of the expandable fusion device, and a second endplate having a lower surface defining a second plane extending from the first side of the expandable fusion device to the second side of the expandable fusion device, wherein the first and second endplates each include at least one mating feature;

a first ramp including at least one opening and mating features configured to mate with the at least one mating features of the first and second endplates, wherein the first ramp is slidable with respect to the first and second endplates;

a second ramp including at least one opening generally aligned with the at least one opening in the first ramp and mating features configured to mate with the at least one mating features of the first and second endplates; and

a threaded member configured to engage a corresponding opening in each of the first ramp and the second ramp to lock a position of the first ramp relative to a position of the second ramp,

wherein the expandable fusion device is movable between a collapsed configuration and an expanded configuration and in the collapsed configuration the first plane and the second plane are non-parallel; and

an inserter instrument comprising;

an outer shaft having a bore extending longitudinally therethrough, the outer shaft configured to engage the at least one opening in the second ramp; and

an inner shaft extending through the bore in the outer shaft, the inner shaft configured to engage the at least one opening in the first ramp.

2. The system of claim 1, wherein the inner shaft of the inserter instrument is threaded, and the inner shaft threadedly engages the at least one opening in the first ramp.

3. The system of claim 1, wherein the outer shaft of the inserter instrument is threaded, and the outer shaft threadedly engages the at least one opening in the second ramp.

4. The system of claim 1, wherein the inner shaft is configured to axially move through the outer shaft of the inserter instrument.

5. The system of claim 1, wherein the upper surface and the lower surface are configured to contact a respective vertebral body, wherein the upper surface and the lower surface of the first and second endplates has one or more of teeth, ridges, friction increasing elements, keels, or gripping or purchasing projections.

6. The system of claim 1, wherein a central longitudinal axis of the first opening is off-center from a central longitudinal axis of the first ramp.

7. A system comprising:

an expandable fusion device comprising;

a first endplate having an upper surface defining a first plane extending from a first side of the expandable fusion device to a second side of the expandable fusion device, and a second endplate having a lower surface defining a second plane extending from the first side of the expandable fusion device to the second side of the expandable fusion device, wherein the first and second endplates each include at least one mating feature;

a first ramp including first and second openings and mating features configured to mate with the at least one mating features of the first and second endplates, wherein the first ramp is slidable with respect to the first and second endplates;

a second ramp including first and second openings and mating features configured to mate with the at least one mating features of the first and second endplates, the first opening generally aligned with the first opening in the first ramp, and the second opening generally aligned with the second opening in the second ramp;

a threaded member configured to engage a corresponding opening in each of the first ramp and the second ramp to lock a position of the first ramp relative to a position of the second ramp,

wherein the expandable fusion device is movable between a collapsed configuration and an expanded configuration and in the collapsed configuration the first plane and the second plane are non-parallel; and

an inserter instrument comprising;

an outer shaft having a bore extending longitudinally therethrough, the outer shaft configured to engage the first or second opening in the second ramp; and

an inner shaft extending through the bore in the outer shaft, the inner shaft configured to engage the corresponding first or second opening in the first ramp.

8. The system of claim 7, wherein the first and second openings of the first ramp are threaded.

9. The system of claim 8, wherein the inner shaft of the inserter instrument is threaded, and the inner shaft threadedly engages the first opening in the first ramp.

10. The system of claim 7, wherein the first and second openings of the second ramp are threaded.

11. The system of claim 10, wherein the outer shaft of the inserter instrument is threaded, and the outer shaft threadedly engages the first opening in the second ramp.

12. The system of claim 7, wherein the inner shaft is configured to axially move through the outer shaft of the inserter instrument.

13. A system comprising:

an expandable fusion device comprising;

a first endplate having an upper surface defining a first plane extending from a first side of the expandable fusion device to a second side of the expandable fusion device, and a second endplate having a lower surface defining a second plane extending from the first side of the expandable fusion device to the second side of the expandable fusion device, wherein the first and second endplates each include mating features;

a first ramp including first and second openings and mating features configured to mate with the mating features of the first and second endplates, wherein the first ramp is slidable with respect to the first and second endplates;

a second ramp including first and second openings and mating features configured to mate with the mating features of the first and second endplates, the first opening generally aligned with the first opening in the first ramp, and the second opening generally aligned with the second opening in the second ramp; and

a threaded member configured to engage a corresponding opening in each of the first ramp and the second ramp to lock a position of the first ramp relative to a position of the second ramp,

wherein the expandable fusion device is movable between a collapsed configuration and an expanded configuration and in the collapsed configuration the first plane and the second plane are non-parallel; and

an inserter instrument comprising;

an outer shaft having a bore extending longitudinally therethrough, the outer shaft having a threaded outer surface extending through the other of the first or second openings in the second ramp; and

an inner shaft extending through the bore in the outer shaft, the inner shaft having a threaded outer surface extending through the corresponding first or second opening in the first ramp.

14. The system of claim 13, wherein the first and second openings of the first ramp are threaded.

15. The system of claim 13, wherein the first and second openings of the second ramp are threaded.

16. The system of claim 13, wherein the inner shaft is configured to axially move through the outer shaft of the inserter instrument.