Abstract: A rotary device includes a fastening seat and a fastening block. The fastening seat is provided with a receiving slot for receiving a spine-locking rod or screw. The receiving slot is provided on the inner wall with two retaining recesses. The fastening block is provided with a retaining flange and an arcuate press surface. The fastening block is disposed in the receiving slot of the fastening seat. As the fastening block is so turned that the retaining flange of the fastening block is fitted into the retaining recesses of the fastening seat, the spine-locking rod or screw is pressed against by the arcuate press surface of the fastening block.

Abstract: A spine fixing device includes a main hooked seat, two extension hooks, and two fastening members. The main hooked seat is provided with a main hooked portion, two extension arms, and two fastening rods for fastening two fixation rods of the prior art. The extension hook is provided at one end with a curved portion, and at other end with an adjustment portion which is fastened with one of the two extension arms of the main hooked seat by one of the two fastening members. The device is retained in the back of one spinal segment such that the main hooked portion is inserted into a portion of the spinal canal of the spinal segment, and that the extension arms embrace the spinal projection of the spinal segment, and further that the curved portions of the extension hooks catch two different portions of the spinal canal of the spinal segment from the opposite direction.

Abstract: A vertebral fixation device comprises a fixation seat, a fixation block, and a fastening bolt. The fixation seat is provided with a receiving slot for receiving a vertebral fixation rod. The fixation block is engaged with the fixation seat such that the vertebral fixation rod is pressed by the fixation block, and that two retaining edges of the fixation block are retained in two retaining recesses of the fixation seat. The fastening bolt is engaged with a threaded through hole of said fixation block such that one end of the fastening bolt presses against the vertebral fixation rod.