Damping piece and built-in meridian traction osteogenesis device for maxilla

The damping piece comprises a shell, an elastic piece and a movable piece, the interior of the shell is hollow, first sliding holes distributed in the length direction of the shell are formed in the side wall of the shell, the elastic piece and the movable piece are both arranged in the shell, and the elastic piece and the movable piece are arranged in the shell. One end of the elastic piece abuts against the movable piece, the other end of the elastic piece abuts against the end, away from the movable piece, in the shell, and the movable piece is provided with a connecting lug extending out of the shell through the first sliding hole. The elastic force of the elastic piece is used for restraining the movable piece from sliding in the length direction of the first sliding hole, the structure is simple, so that when the movable piece overcomes the elastic force of the elastic piece and slides relative to the shell, the size of the whole damping piece does not change, meanwhile, the elastic piece directly appli