Patent ID: 8048132

Claim:
A spine fixation device, comprising: a bone screw comprising: a screw unit; and a fixation unit formed at a top end of the screw unit, the fixation unit having a top surface, the top surface being provided with an annular groove having a center defined by a center of the top surface, the top surface being centrally formed with a threaded hole, the top surface having an edge extending upward to form a first stop plate; a fixation carrier comprising: a hollow body having a wall formed with a pair of corresponding U-shaped openings; a first extension unit extending downward from the hollow body, the first extension unit having a lateral portion extending outward to form a second stop plate, the second stop plate being rotatable between a first end and a second end of the first stop plate, the first extension unit being formed with an aperture which corresponds in position to the threaded hole and is in communication with the hollow body; and a second extension unit extending downward from the first extension unit so as to form a hollow annular projection to be rotatably coupled to the annular groove; and a first locking member to be locked in the threaded hole through the aperture, thereby conjugating the bone screw with the fixation carrier.