Minimally invasive pedicle screw and system

The utility model discloses a minimally invasive pedicle screw and a system, and belongs to the technical field of orthopedic implants, the minimally invasive pedicle screw comprises a screw seat and a screw rod, the screw seat is provided with a U-shaped groove used for placing a connecting rod, a screw plug is in threaded connection in the U-shaped groove, two side walls of the U-shaped groove of the screw seat are respectively provided with a long tail piece extending upwards, and the long tail pieces are connected with the screw plug in a threaded mode. Breaking grooves are formed between the long tail piece and the two side walls of the U-shaped groove, the breaking grooves comprise outer breaking grooves located in the outer surfaces of the two side walls of the U-shaped groove and inner breaking grooves located in the inner surfaces of the two side walls of the U-shaped groove and opposite to the outer breaking grooves, the lower side walls of the outer breaking grooves are provided with concave groove