Expandable interbody device

• US 10,034,765 B2
• Filed: 05/30/2017
• Issued: 07/31/2018
• Est. Priority Date: 12/05/2013
• Status: Active Grant

• Current Assignee: Spinal Elements, Inc.
• Original Assignee: Spinal Elements, Inc.
• Inventors: Blain, Jason, Solum, David, Johnson, Dean, Flores, Markanthony
• Primary Examiner(s): Ku, Si Ming
• Application Number:
  US15/608,079
• Publication Number:
  US 20170258605A1
• Time in Patent Office: 427 Days
• CPC Class Codes: A61F 2/30771 applied in original prostheses, e.g. holes or grooves
• CPC Class Codes: A61F 2/441 made of inflatable pockets or chambers filled with fluid, e.g. with hydrogel
• 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 2/4603 for insertion or extraction of endoprosthetic joints or of accessories thereof
• CPC Class Codes: A61F 2/4611 of spinal prostheses
• CPC Class Codes: A61F 2002/3006 Properties of materials and coating materials
• CPC Class Codes: A61F 2002/3008 radio-opaque, e.g. radio-opaque markers
• CPC Class Codes: A61F 2002/30217 hollow cones, e.g. tubular-like cones
• CPC Class Codes: A61F 2002/30281 wedge-shaped
• CPC Class Codes: A61F 2002/30367 with additional means for preventing said rotation
• CPC Class Codes: A61F 2002/30405 made by screwing complementary threads machined on the parts themselves
• CPC Class Codes: A61F 2002/30408 Conical threadings
• 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 2002/30774 internally-threaded
• CPC Class Codes: A61F 2002/30785 parallel
• CPC Class Codes: A61F 2002/30828 parallel
• 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 2002/30904 : serrated profile, i.e. saw-toothed
• 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 2002/4622 : having the shape of a forceps or a clamp
• CPC Class Codes: A61F 2002/4627 : with linear motion along or rotating motion about the instrument axis or the implantation direction, e.g. telescopic, along a guiding rod, screwing inside the instrument
• 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 2310/00203 : containing alumina or aluminium oxide
• CPC Class Codes: A61F 2310/00239 : containing zirconia or zirconium oxide ZrO2
• CPC Class Codes: A61F 2310/00407 : Coating made of titanium or of Ti-based alloys

Abstract

An expandable interbody device for placement between adjacent vertebrae having an upper structure, a lower structure and a screw mechanism, wherein actuation of the screw mechanism moves the upper and lower structures between a collapsed configuration and an expanded configuration. A deployment tool couples to the expandable interbody device for positioning the device between adjacent vertebrae, actuating the screw mechanism and delivering a material to a chamber of the expandable interbody device.

Claims

1. An expandable interbody device for placement between vertebrae comprising:

an upper structure configured to abut a superior vertebra;

a lower structure configured to abut an inferior vertebra; and

a screw mechanism between the upper structure and the lower structure, the screw mechanism comprising a proximal portion, a distal portion and a coupler at least partially between the proximal portion and the distal portion;

wherein the proximal portion and the distal portion are configured to rotate as a unit to change a distance between the proximal portion and the distal portion from a first length to a second length; and

wherein the coupler further comprises at least one anti-rotational feature configured to engage the upper structure or the lower structure to prevent the coupler from rotating when the proximal portion and the distal portion are rotated.

2. The device of claim 1, wherein the proximal portion comprises a frustoconical surface configured to wedge between the upper structure and the lower structure, and wherein the distal portion comprises a frustoconical surface configured to wedge between the upper structure and the lower structure to change a distance between the upper structure and the lower structure from a first height to a second height.

3. The device of claim 1, wherein the proximal portion comprises first threads wound in a first direction configured to engage a proximal threaded hole in the coupler, and the distal portion comprises second threads wound in a second direction, opposite the first direction, configured to engage a distal threaded hole in the coupler.

4. The device of claim 3, wherein the first threads and the second threads have an equal pitch, such that when the screw mechanism is actuated, a proximal end of the interbody device changes height at a same rate as a distal end of the interbody device.

5. The device of claim 3, wherein the first threads and the second threads have a different pitch, such that when the screw mechanism is actuated, a proximal end of the interbody device changes height at a different rate than a distal end of the interbody device.

6. The device of claim 1, wherein one or more of the upper structure and the lower structure further comprise a plurality of protrusions or teeth.

7. The device of claim 1, wherein one or more of the upper structure and the lower structure comprise vertebrae engagement surfaces with a porous or roughened surface.

8. The device of claim 7, wherein the vertebrae engagement surfaces comprise a titanium coating.

9. The device of claim 1, wherein the proximal portion comprises at least one hole in fluid communication with a drive interface and an interior cavity of the interbody device.

10. The device of claim 1, further comprising at least one recess configured to couple with a deployment tool, the at least one recess comprising a hole in fluid communication with an interior cavity of the interbody device.

11. The device of claim 1, wherein the distal portion comprises a keyed shaft configured to slideably engage with a matching keyed bore on the proximal portion.

12. An expandable interbody device for placement between adjacent vertebrae comprising:

an upper structure configured to abut a superior vertebra;

a lower structure configured to abut an inferior vertebra; and

a screw mechanism between the upper structure and the lower structure, the screw mechanism comprising a proximal portion and a distal portion that are configured to rotate as a unit to change a distance between the proximal portion and the distal portion from a first length to a second length;

wherein the change in the length of the screw mechanism causes the distance between the upper structure and the lower structure to change from a first height to a second height;

wherein the screw mechanism further comprises at least one anti-rotational feature that engages the upper structure or the lower structure to prevent the at least one anti-rotational feature from rotating when the proximal portion and the distal portion are rotated.

13. The device of claim 12, wherein the proximal portion comprises a frustoconical surface configured to wedge between the upper structure and the lower structure, and wherein the distal portion comprises a frustoconical surface configured to wedge between the upper structure and the lower structure to change the distance between the upper structure and the lower structure.

14. The device of claim 12, wherein the proximal portion comprises first threads wound in a first direction configured to engage a proximal threaded hole in a coupler, and the distal portion comprises second threads wound in a second direction, opposite the first direction, configured to engage a distal threaded hole in the coupler.

15. The device of claim 14, wherein the first threads and the second threads have an equal pitch, such that when the screw mechanism is actuated, a proximal end of the interbody device changes height at a same rate as a distal end of the interbody device.

16. The device of claim 14, wherein the first threads and the second threads have a different pitch, such that when the screw mechanism is actuated, a proximal end of the interbody device changes height at a different rate than a distal end of the interbody device.

17. The device of claim 12, wherein one or more of the upper structure and the lower structure further comprise a plurality of protrusions or teeth.

18. The device of claim 12, wherein one or more of the upper structure and the lower structure comprise vertebrae engagement surfaces with a porous or roughened surface.

19. The device of claim 18, wherein the vertebrae engagement surfaces comprise a titanium coating.

20. The device of claim 12, wherein the distal portion comprises a keyed shaft configured to slideably engage with a matching keyed bore on the proximal portion.