Disclosed is a spine fixation apparatus, more particularly, a pedicle screw implanted into a spine and an operating device for the pedicle screw capable of easily inserting a rod to a head section of the pedicle screw in order to securely fix the spine. One laser pointer and one image sensor are arranged on the measuring reference portion, and also One laser pointer and one image sensor are arranged on the measured portion. Further, with respect to the reproducing and the recording of the information, their respective proper operation temperature ranges are set individually. The fluid control mechanism of the valve assembly is constructed to direct fluid through the valve body and to enable the fluid flow to be shut off.