EXPANDABLE SPINAL INTERBODY AND INTRAVERTEBRAL BODY DEVICES

• US 20130197647A1
• Filed: 03/13/2013
• Published: 08/01/2013
• Est. Priority Date: 03/31/2005
• Status: Active Grant

• Current Assignee: Life Spine, Inc.
• Original Assignee: Life Spine, Inc.
• Inventors: Wolters, Madeline, Butler, Michael S., Predick, Daniel
• Granted Patent: US 9,034,041 B2
• Time in Patent Office: Days
• US Class Current: 623/17.16
• CPC Class Codes: A61B 17/8858 laterally or radially expansible inflatable A61B17/8855
• 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 2/446 having a circular or elliptical cross-section substantially parallel to the axis of the spine, e.g. cylinders or frustocones
• CPC Class Codes: A61F 2/447 substantially parallelepipedal, e.g. having a rectangular or trapezoidal cross-section
• CPC Class Codes: A61F 2002/30158 trapezoidal
• CPC Class Codes: A61F 2002/30179 X-shaped
• CPC Class Codes: A61F 2002/30428 made by inserting a protrusion into a slot
• 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 2002/30507 using a threaded locking member, e.g. a locking screw or a set screw
• CPC Class Codes: A61F 2002/30523 by means of meshing gear teeth
• CPC Class Codes: A61F 2002/3055 for adjusting length
• 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 2002/30594 slotted, e.g. radial or meridian slot ending in a polar aperture, non-polar slots, horizontal or arcuate slots
• CPC Class Codes: A61F 2002/30784 Plurality of holes
• CPC Class Codes: A61F 2002/30841 Sharp anchoring protrusions for impaction into the bone, e.g. sharp pins, spikes
• CPC Class Codes: A61F 2002/30904 serrated profile, i.e. saw-toothed
• CPC Class Codes: A61F 2002/4415 elements of the prosthesis being arranged in a chain like manner
• 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 device for insertion into a spinal (intervertebral or intravertebral) space is expandable from a first circumference to a second circumference through axial compression of segments of the device, particularly once the device has been properly situated within a vertebral space. The interbody/intravertebral body device is characterized by a plurality of axially stacked, individual segments that are provided on a central insertion and deployment rod. Each segment includes a central plate or body to which are pivotally attached plate or leaf structures. Pivoting of the structures provides a collapsed or unexpanded position of the first circumference and an open or expanded position of the second circumference.

Claims

1. An implant for insertion into a spinal space, the implant comprising:

a body assembly, the body assembly comprising a first portion moveably coupled to a second portion along a longitudinal axis; and

upper and lower support members disposed at least partially between the first portion and the second portion;

wherein movement of the first portion and the second portion toward each other causes the upper and lower support members to move away from each other, and wherein movement of the first portion and the second portion away from each other causes the upper and lower members to move toward each other.

2. The implant of claim 1, further comprising a control member moveably coupling the first portion to the second portion, the control member extending through the second portion and being threadingly received within the first portion.

3. The implant of claim 2, wherein rotation of the control member moves the first portion relative to the second portion.

4. The implant of claim 3, wherein the control member comprises a screw having a threaded portion received by a threaded bore in the first portion, and a head received within a counterbore in the second portion.

5. The implant of claim 1, wherein the upper and lower support members are configured to move linearly and/or radially in generally opposite directions relative to one another.

6. The implant of claim 1, wherein the first and second portions comprise ramped surfaces that slidingly engage correspondingly ramped surfaces on the upper and lower support members.

7. The implant of claim 6, wherein the upper member defines at least first and second channels, the first channel receiving a first projection on the first portion of the body assembly, the second channel receiving a second projection on the second portion of the body assembly.

8. The implant of claim 7, wherein the first and second projections comprise a dovetail shape configured to prevent separation of the upper member from the first and second portions while the first and second projections reside in the first and second channels.

9. The implant of claim 8, further comprising a plurality of retaining members configured to limit movement of the first and second projections within the first and second channels.

10. The implant of claim 1, wherein a maximum length of the implant decreases as a maximum height of the implant increases.

11. An implant comprising:

a front portion;

a rear portion;

a control portion extending through the rear portion and at least partially within the second portion; and

first and second support members configured to move away from each other in a linear fashion as the control portion moves the front and rear portions toward each other.

12. The implant of claim 11, wherein the first and second support members slidably engage the front and rear portions as the first and second support members move between a collapsed configuration and an expanded configuration.

13. The implant of claim 12, wherein the control portion extends along a longitudinal axis, and wherein the front and rear portions defined ramped surfaces angled relative to the longitudinal axis that slidingly engage correspondingly ramped surfaces on the first and second support members.

14. The implant of claim 13, further comprising a plurality of retaining members provided in each of the first and second support members, the plurality of retaining members limiting the sliding movement of the ramped surfaces on the front and rear portions relative to the ramped surfaces on the first and second support members.

15. The implant of claim 11, wherein the first and second support members include opposite outward-facing surfaces configured to engage adjacent vertebral bodies.

16. The implant of claim 11, wherein the front portion threadingly engages the intermediate portion such that rotation of the intermediate portion causes the front portion to move relative to the rear portion.

17. An implant for insertion into a spinal space, the implant comprising:

a front member having at least one first projection and at least one first ramped surface;

a rear member having at least one second projection and at least one second ramped surface; and

at least one support having a first channel slidingly receiving the at least one first projection and a second channel slidingly receiving the at least one second channel;

wherein relative movement between the front and rear members causes the at least one first projection to slide within the first channel and the at least one second projection to slide within the second channel to change a height of implant.

18. The implant of claim 17, wherein the at least one first projection and the at least one second projection are dovetail-shaped.

19. The implant of claim 17, wherein the at least one support comprises first and second retaining members, the first retaining member configured to engage the at least one first projection, and the second retaining member configured to engage the at least one second projection to limit movement of the at least one support relative to the front and rear members.

20. The implant of claim 19, wherein the at least one support comprises an outer surface having a plurality of ridges and defining a bone graft cavity.