In-situ formed intervertebral fusion device and method
An orthopedic device for implanting between adjacent vertebrae comprising: an arcuate balloon and a hardenable material within said balloon. In some embodiments, the balloon has a footprint that substantially corresponds to a perimeter of a vertebral endplate. An inflatable device is inserted through a cannula into an intervertebral space and oriented so that, upon expansion, a natural angle between vertebrae will be at least partially restored. At least one component selected from the group consisting of a load-bearing component and an osteobiologic component is directed into the inflatable device through a fluid communication means.
1. An expandable spinal fusion device, comprising:
a first component defined by a first pair of sidewalls, an upper surface having an upper bone contacting surface thereon, and a lower surface, a portion of the lower surface being a first angled wall that extends to the upper surface at an oblique angle with respect to the upper bone contacting surface; and
a second component defined by a second pair of sidewalls, an upper surface, and a lower surface having a lower bone contacting surface thereon, a portion of the upper surface being a second angled wall that extends to the lower surface at an oblique angle with respect to the lower bone contacting surface;
wherein the upper surface of the first component and the lower surface of the second component define a height therebetween,
wherein the first angled wall is configured to move relative to the second angled wall, and
wherein the height is increased when the first and second angled walls move relative to one another.
2. The device of claim 1 , wherein the upper surface of the first component and the lower surface of the second component each include teeth extending therefrom for gripping bone.
3. The device of claim 1 , wherein a portion of the lower surface of the first component extends across a central axis defined between the first component and the second component.
4. The device of claim 1 , wherein a ridge of the first component fits into a corresponding groove of the second component, the ridge of the first component extending away from the upper bone contacting surface.
5. The device of claim 1 , wherein a height of a medial portion of the first component is greater than a height of lateral portions of the first component.
6. The device of claim 1 , wherein the device has a wedge shape for creating or restoring curvature of the spine.
7. The device of claim 6 , wherein the wedge shape is such that a height of an anterior portion of the device is greater than a height of a posterior portion of the device.
8. The device of claim 7 , wherein the wedge shape produces an angle of between about 5 and about 20 degrees.
9. The device of claim 7 , wherein the wedge shape produces an angle of between about 5 and about 15 degrees.
10. The device of claim 7 , wherein the wedge shape produces an angle of about 10 degrees.
11. The device of claim 1 , further comprising a cannula configured to attach to one or more of the sidewalls of the first and second components to position the device within a disc space.
12. The method of claim 1 , wherein the first component and the second component each have a height that is less than a height of a disc space.
13. The device of claim 1 , further comprising a guidewire extending longitudinally through the device such that the device is insertable over the guidewire.
14. The device of claim 13 , wherein the guidewire extends completely through the device.
15. The device of claim 1 , wherein the device has an unexpanded configuration and an expanded configuration; and
wherein the upper surface of the first component and the lower surface of the second component are substantially parallel to one another in each of the unexpanded and expanded configurations.