Bi-directional fixating/locking transvertebral body screw/intervertebral cage stand-alone constructs having a central screw locking lever, and pliers and devices for spinal fusion

1. A bi-directional fixating transvertebral (BDFT) screw/cage apparatus, comprising:

an intervertebral cage for maintaining disc height,

wherein the intervertebral cage includes:

a top wall, a bottom wall, and two sidewalls defining an open space capable of receiving bone filling for the biological bone fusion;

a first internal screw guide and a second internal screw guide,

wherein the first internal screw guide and the second internal screw guide each have an internal bore with an entry opening and an exit opening, the entry opening of the internal bore formed only in a top surface of the top wall and the exit opening formed at least partially in a bottom surface of the top wall and at least partially in a side surface of the top wall, and

wherein each of the first internal screw guide and the second internal screw guide are angled to orient the first screw member and the second screw member bi-directionally in opposite directions; and

a central screw locking lever coupled to the intervertebral cage, wherein the central screw locking lever prevents the first screw member and the second screw member from pulling-out of the first internal screw guide and the second internal screw guide.

2. The apparatus according to claim 1 , wherein the central screw locking lever includes a screw locking horizontal bracket.

3. The apparatus according to claim 2 , wherein the screw locking horizontal bracket is press fit on a top of the intervertebral cage and covers and locks the first screw member and the second screw member in the intervertebral cage.

4. The apparatus according to claim 2 , wherein the screw locking horizontal bracket includes:

a cover portion extending in a direction of the longitudinal axis of the intervertebral cage and substantially parallel to the top surface of the top wall of the intervertebral cage, the cover portion covering and locking the first screw member and the second screw member in the intervertebral cage; and

side tabs on each end of the cover portion,

wherein the side tabs extend in a direction perpendicular to the cover portion along the sides of the intervertebral cage.

5. The apparatus according to claim 4 , wherein the side tabs include bracket hooks extending from the side tabs toward the sides of the intervertebral cage and in a direction of the longitudinal axis of the intervertebral cage.

6. The apparatus according to claim 2 , wherein the intervertebral cage includes one or more slots for lockingly engaging a part of the screw locking horizontal bracket.

7. The apparatus according to claim 5 , wherein the sides of the intervertebral cage include hook insertion slots, and

wherein the bracket hooks engage the hook insertion slots.

8. The apparatus according to claim 7 , wherein the bracket hooks lockingly engage the hook insertion slots.

9. The apparatus according to claim 4 , wherein the side tabs of the screw locking horizontal bracket include bracket flexion grips.

10. The apparatus according to claim 2 , wherein the screw locking horizontal bracket is deformable.

11. The apparatus according to claim 9 , wherein the screw locking horizontal bracket is deformable under pressure applied to the bracket flexion grips.

12. The apparatus according to claim 5 , wherein the bracket hooks include flexible bracket hooks.

13. A method of inserting a bi-directional fixating transvertebral (BDFT) screw/cage apparatus between a first vertebral body and a second vertebral body, the method including:

inserting an intervertebral cage into a midline of a disc space between the first vertebral body and the second vertebral body until the intervertebral cage is one of flush and countersunk relative to the first vertebral body and the second vertebral body,

wherein the intervertebral cage includes:

a top wall, a bottom wall, and two sidewalls defining an open space capable of receiving bone filling for the biological bone fusion;

a first internal screw guide and a second internal screw guide,

wherein the first internal screw guide and the second internal screw guide each have an internal bore with an entry opening and an exit opening, the entry opening of the internal bore formed only in a top surface of the top wall and the exit opening formed at least partially in a bottom surface of the top wall and at least partially in a side surface of the top wall, and

inserting the first screw member into the first internal screw guide of the selected intervertebral cage;

inserting the second screw member into the second internal screw guide of the selected intervertebral cage;

screwing the first screw member and the second screw member into the first vertebral body and the second vertebral body respectively; and

locking the first screw member and the second screw member in the intervertebral cage using a screw locking horizontal bracket coupled to the intervertebral cage, wherein the screw locking horizontal bracket prevents the first screw member and the second screw from pulling-out of the first internal screw guide and the second internal screw guide.

14. The method according to claim 13 , wherein the central screw locking lever includes a screw locking horizontal bracket, and

wherein the locking includes press fitting the screw locking horizontal bracket on a top of the intervertebral cage such that the screw locking horizontal bracket covers and locks the first screw member and the second screw member in the intervertebral cage.

15. The method according to claim 14 , further comprising:

unlocking the first screw member and the second screw member,

wherein the intervertebral cage includes hook insertion slots,

wherein the screw locking horizontal bracket includes:

a cover portion extending in a direction of a longitudinal axis of the intervertebral cage and substantially parallel to a top face of the intervertebral cage, the cover portion covering and locking the first screw member and the second screw member in the intervertebral cage;

side tabs on each end of the cover portion,

wherein the side tabs extend in a direction perpendicular to the cover portion along the sides of the intervertebral cage, and

wherein the side tabs include bracket hooks extending from the side tabs and lockingly engaging the hook insertion slots of the intervertebral cage, and bracket flexion grips for deforming the screw locking horizontal bracket,

wherein said unlocking includes:

applying pressure to the bracket flexion grips to deform the screw locking horizontal bracket such that the side tabs of the screw locking bracket move away from the intervertebral cage and release the bracket hooks of the screw locking horizontal bracket from the hook insertion slots of the intervertebral cage.

16. A bi-directional fixating transvertebral (BDFT) screw/cage apparatus, comprising:

an intervertebral cage for maintaining disc height, wherein the intervertebral cage includes:

a top wall, a bottom wall, and two sidewalls defining an open space capable of receiving bone filling for the biological bone fusion;

a first internal screw guide and a second internal screw guide,

wherein the first internal screw guide and the second internal screw guide each have an internal bore with an entry opening and an exit opening, the entry opening of the internal bore formed only in a top surface of the top wall and the exit opening formed at least partially in a bottom surface of the top wall and at least partially in a side surface of the top wall, and

wherein each of the first internal screw guide and the second internal screw guide are angled to orient the first screw member and the second screw member bi-directionally in opposite directions; and

a screw locking horizontal bracket coupled to the intervertebral cage, wherein the central screw locking bracket extends over the top surface of the top wall and over the screw heads of the first screw member and the second screw member and prevents the first screw member and the second screw member from pulling-out of the first internal screw guide and the second internal screw guide.

17. The apparatus according to claim 16 , wherein the screw locking horizontal bracket is press fit on a top of the intervertebral cage.

18. The apparatus according to claim 16 , wherein the screw locking horizontal bracket includes:

a cover portion extending in a direction of the longitudinal axis of the intervertebral cage and substantially parallel to the top surface of the top wall of the intervertebral cage, the cover portion covering the screw heads of the first screw member and the second screw member and locking the first screw member and the second screw member in the intervertebral cage; and

side tabs on each end of the cover portion,

wherein the side tabs extend in a direction perpendicular to the cover portion along opposite side surfaces of longitudinal ends of the top wall of the intervertebral cage.