Novel sternum retractor

The utility model belongs to the field of medical instruments, and particularly relates to a novel sternum retractor which comprises a guide rail, a movable arm and retraction blades, a guide groove is formed in the lower end of the movable arm and assembled on the guide rail through the guide groove, the movable arm can displace along the guide rail and can achieve positioning, one end of the guide rail is fixedly connected with a base, and a rotating arm is installed on the base. The rotating arm can rotate in the axial direction, a locking mechanism is arranged corresponding to the rotatingarm, and the position of the rotating arm is locked through the locking mechanism; and retraction blades are arranged on the movable arm and the rotating arm. The rotating arm can rotate in the axialdirection, so that the retraction blade can be driven to swing in a certain range, the sternum on the other side can be lifted to a certain height in the process of opening the sternum, a doctor canfully expose the position b