One -way pedicle of vertebral arch screw of X axle

The utility model belongs to the technical field of correction of the spinal column and internal fixation device technique and specifically relates to an one -way pedicle of vertebral arch screw of X axle. It includes the fixing base and the body of screw, and the upper portion of fixing base has been seted up a U type along its axial and has been acceptd the breach, and in the fixing base, be located the U type and accept the below of breach and seted up a sphere groove, the body of screw includes bulb portion and screw rod portion, bulb portion holding in sphere inslot, the sphere inslot, acceping two open -endeds of breach and arranging that the direction is formed with first vertical plane of two symmetries along being on a parallel with the U type, be provided with the vertical plane of second on the symmetrical lateral wall of bulb portion, first vertical plane is attached with the vertical plane phase of second. The utility model discloses a vertical planar setting of first vertical plane and second for the screw can only be followed for the fixing base and is on a parallel with fixed connecting rod male direction motion, has avoided causing application of force difficulty owing to adopt the cardan shaft structure, can't carrying out the problem that scoliosis removed rotation operations, or has caused fixed connecting rod to place difficulty, the slow problem of operation speed owing to adopt the fixed axle structure.