B-shaped interbody implant
AssigneeWarsaw Orthopedic, Inc.
InventorJonathan M. Dewey
Life of this patent
Estimating the term…
Abstract
A B-shaped implant for insertion into a disc space between adjacent vertebral bodies. The implant includes first and second projecting lobes configured to sit on bony prominences adjacent a posterior rim of a lower one of the vertebral bodies. A concave recess between the two projecting lobes is configured to avoid impact with the vertebral foramen. An anterior portion wall connects ends of the B-shaped implant, cooperating with the projecting lobes to define fill spaces. The fill spaces can be packed with bone growth material. The implant can be expandable, made of rotatable interconnected links, which can be inserted into the disc space in an unexpanded position, and expanded in the disc space to an expanded position.
Claims35
A spinal implant for surgical insertion in a patient's vertebral disc space between two adjacent vertebral bodies, each of the adjacent vertebral bodies including an anterior portion and a posterior portion, the spinal implant comprising:
- a generally B-shaped portion having a first end and a second end, the generally B-shaped portion including a first projecting lobe and a second projecting lobe, the first and second projecting lobes being spaced apart by a concave recess defined therebetween, the concave recess including an outer surface and an inner surface, the first and second projecting lobes being configured to sit on at least one prominent bone portion of a posterior rim of a lower one of the adjacent vertebral bodies, the concave recess being configured to substantially avoid contact with a vertebral foramen adjacent the posterior rim of the lower one of the adjacent vertebral bodies;
- and
- an anterior wall having a first anterior wall portion, the first anterior wall portion extending between the first end of the generally B-shaped portion and a position on the inner surface of the convex recess, and a second anterior wall portion, the second anterior wall portion extending between the position on the inner surface of the concave recess and the second end of the generally B-shaped portion, the first and second anterior wall portions and the respective first and second projecting lobes defining respective first and second fill spaces therebetween, the first fill space having a first capacity, the first capacity being adapted to receive therein at least a first volume of a bone growth material, the second fill space having a second capacity, the second capacity being adapted to receive therein at least a second volume of the bone growth material, each of the first and second fill spaces having an upper portion, and a lower portion, at least one of the upper portions and the lower portions being open to allow bone growth therethrough.
A spinal implant for surgical insertion in a patient's vertebral disc space between two adjacent vertebral bodies, each of the adjacent vertebral bodies including an anterior portion and a posterior portion, the spinal implant comprising:
- a generally B-shaped portion having a first end and a second end, a first projecting lobe and a second projecting lobe, the first and second projecting lobes being spaced apart by a concave recess defined therebetween, the concave recess including an outer surface and an inner surface, the first and second projecting lobes being configured to sit on at least one prominent bone portion of a posterior rim of one of the adjacent vertebral bodies, the concave recess being configured to substantially avoid contact with a vertebral foramen adjacent the posterior rim of the one of the adjacent vertebral bodies, the generally B-shaped portion being configured to carry a first amount of load;
- an anterior wall having a first anterior wall portion, the first anterior wall portion extending between the first end of the generally B-shaped portion and a position on the inner surface of the concave recess, and a second anterior wall portion, the second anterior wall portion extending between the position on the inner surface of the concave recess and the second end of the generally B-shaped portion, the first and second anterior wall portions and the respective first and second projecting lobes defining respective first and second fill spaces therebetween, the first and second fill spaces being configured to allow bone growth therethrough, the first fill space having a first capacity, the first capacity being adapted to receive therein at least a first volume of a bone growth material, the second fill space having a second capacity, the second capacity being adapted to receive therein at least a second volume of the bone growth material, the anterior wall being configured to carry a second amount of load, the second amount of load being less than the first amount of load.
A method of inserting a spinal implant into a disc space between two adjacent vertebral bodies, each of the adjacent vertebral bodies including an anterior portion and a posterior portion, the method comprising:
- utilizing a spinal implant, the spinal implant comprising:
- a generally B-shaped portion having a first end and a second end, the generally B-shaped portion including a first projecting lobe and a second projecting lobe, the first and second projecting lobes being spaced apart by a concave recess defined therebetween, the concave recess including an outer surface and an inner surface, the first and second projecting lobes being configured to sit on at least one prominent bone portion of a posterior rim of a lower one of the adjacent vertebral bodies, the concave recess being configured to substantially avoid contact with a vertebral foramen adjacent the posterior rim of one of the adjacent vertebral bodies;
- and
- an anterior wall having a first anterior wall portion, the first anterior wall portion extending between the first end of the generally B-shaped portion and a position on the inner surface of the concave recess, and a second anterior wall portion, the second anterior wall portion extending between the position on the inner surface of the concave recess and the second end of the generally B-shaped portion, the first and second anterior wall portions and the respective first and second projecting lobes defining respective first and second fill spaces therebetween, the first fill space having a first capacity, the first capacity being adapted to receive therein at least a first volume of a bone growth material, the second fill space having a second capacity, the second capacity being adapted to receive therein at least a second volume of the bone growth material, each of the first and second fill spaces being open to allow bone growth therethrough;
- packing at least one of the first fill space and the second fill space with the bone growth material;
- positioning the implant proximate the disc space;
- and
- inserting the implant into the disc space.
Dependencies are inferred from the claim text.