Patent ID: 8377139

Claim:
An implantable assembly comprising: a bone screw having a hub portion and a shank portion, the hub portion comprising a first locking mechanism and the shank portion comprising a second locking mechanism, the second locking mechanism comprising a thread having a plurality of turns, the turns having a uniform diameter; and a spacer comprising an anterior end, a posterior end and a central opening to receive bone fusion material, the spacer forming at least one passage for receiving the bone screw, the passage comprising a first locking section and a second locking section, the second locking section having a thread comprising a plurality of turns having a uniform diameter, wherein the first locking section of the passage is engaged with the first locking mechanism of the hub portion of the bone screw, and wherein the thread of the second locking section in the spacer is engaged with the thread of the second locking mechanism of the bone screw.