Pedicle screw rod device universally used for cortical bone and cancellous bone

The invention discloses a universal pedicle screw rod device for cortical bone and cancellous bone, and relates to the technical field of medical instruments. The universal pedicle screw rod device comprises a screw rod, which is arranged in a bent manner, wherein two ends of the screw rod are respectively provided with a clamping piece I and a clamping piece II, the clamping piece I and the clamping piece II are arranged in a circular manner, through grooves are formed in the front side walls of the clamping piece I and the clamping piece II, and the two ends of the screw rod are arranged inthe through grooves in the clamping piece I and the clamping piece II. According to the universal pedicle screw rod device for the cortical bone and the cancellous bone, through mutual cooperation ofthe clamping piece I, the clamping piece II, the round rod, the fixing nail, the fine threads and the coarse threads, the fixing nail is arranged to be in an inverted cone shape, so that the bottom diameter of the coarse threa