Expandable interbody device

Patent metadata

Field	Value
Publication number	US-2015190242-A1
Application number	US-201414333336-A
Country	US
Kind code	A1
Filing date	Jul 16, 2014
Priority date	Dec 5, 2013
Publication date	Jul 9, 2015
Grant date	—

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.

First claim

What is claimed is:

1 . An expandable interbody device for placement between adjacent vertebrae comprising:
an upper structure comprising an upper proximal angled surface and an upper distal angled surface; a lower structure comprising a lower proximal angled surface and a lower distal angled surface, the lower structure configured to slideably couple with the upper structure; and a screw mechanism between the upper structure and the lower structure, the screw mechanism comprising:
a proximal section comprising a proximal frustoconical surface;
a distal section comprising a distal frustoconical surface; and
a coupler comprising a proximal side configured to engage the proximal section and a distal side configured to engage the distal section;
wherein the proximal section and the distal section are configured to rotate as a unit to change a length of the screw mechanism from a first length to a second length;
wherein the proximal frustoconical surface is configured to engage the upper proximal angled surface and the lower proximal angled surface, and the distal frustoconical surface is configured to engage the upper distal angled surface and the lower distal angled surface to move the upper structure and the lower structure from a first distance to a second distance.

2 . The device of claim 1 , wherein the coupler further comprises at least one anti-rotational feature configured to engage the upper structure or lower structure to prevent the coupler from rotating when the proximal section and the distal section are rotated.

3 . The device of claim 1 , wherein the proximal section comprises first threads wound in a first direction configured to engage a proximal threaded hole in the coupler, and the distal section 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 the 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 the upper structure and lower structure further comprise a plurality of protrusions or teeth.

7 . The device of claim 1 , wherein the upper structure and/or 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 section 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 section comprises a keyed shaft configured to slideably engage with a matching keyed bore on the proximal section.

12 . An expandable interbody device for placement between adjacent vertebrae comprising:
an upper structure; a lower structure configured to slideably couple with the upper structure; and a screw mechanism between the upper structure and the lower structure, the screw mechanism comprising a proximal section and a distal section that are configured to rotate as a unit to change a length of the screw mechanism 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 distance to a second distance to form a chamber to be filled by one or more of fluids, medication, bone graft material, allograft and Demineralized Bone Matrix.

13 . A kit for performing spinal stabilization, the kit comprising:
an expandable interbody device for placement between adjacent vertebrae, wherein in an expanded configuration the expandable interbody device comprises a chamber; and a deployment tool for delivering the expandable interbody device between adjacent vertebrae, the deployment tool comprising a distal portion that is releasably attachable to the expandable interbody device and a proximal portion configured to extend outside a surgical incision; wherein the proximal portion comprises an opening to a channel that extends through the deployment tool and is in fluid communication with the distal portion of the deployment tool, the channel capable of transporting a material from outside the incision into the chamber of the expandable interbody device.

14 . The kit of claim 13 , wherein a proximal section of the expandable interbody device comprises at least one hole in fluid communication with the chamber.

15 . The kit of claim 13 , wherein the expandable interbody device further comprises at least one recess with a hole that is in fluid communication with the chamber.

16 . The kit of claim 15 , wherein the deployment tool comprises arms that are configured to attach to the at least one recess and further comprises one or more channels extending to the tips of the arms to deliver material through the at least one recess into the chamber of the expandable interbody device.

17 . A method of implanting an expandable interbody device between adjacent vertebrae comprising:
positioning the expandable interbody device between adjacent vertebrae, wherein the expandable interbody device comprises:
an upper structure;
a lower structure configured to slideably couple with the upper structure; and
a screw mechanism between the upper structure and the lower structure;
rotating the screw mechanism to change a length of the screw mechanism from a first length to a second length which causes the distance between the upper structure and the lower structure to change from a first distance to a second distance to form a chamber; and injecting material into the chamber.

18 . The method of claim 17 , wherein the first distance corresponds to a collapsed configuration with the upper structure adjacent the lower structure and the second distance corresponds to an expanded configuration with the upper structure separated from the lower structure.

19 . The method of claim 17 , wherein the screw mechanism comprises:
a proximal section comprising a proximal frustoconical surface; a distal section comprising a distal frustoconical surface; and a coupler comprising a proximal side configured to engage the proximal section and a distal side configured to engage the distal section.

20 . The method of claim 17 , wherein the material is one or more of fluids, medication, bone graft material, allograft and Demineralized Bone Matrix.

21 . The method of claim 17 , wherein the expandable interbody device is positioned between the adjacent vertebrae using a deployment tool that extends from the vertebrae to outside an incision.

22 . The method of claim 21 , wherein injecting the material comprises delivering the material through a channel extending through the deployment tool.

Assignees

• Spinal Elements Inc

Inventors

• Blain Jason
• Solum David
• Johnson Dean
• Flores Markanthony

Classifications

• A61F2002/30593

  hollow · CPC title

• A61F2/4603

  for insertion or extraction of endoprosthetic joints or of accessories thereof · CPC title

• A61F2002/30217

  hollow cones, e.g. tubular-like cones · CPC title

• A61F2002/30556

  for adjusting thickness · CPC title

• A61F2002/4627

  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 title