Among them is a multi-purpose traction appliance developed by the Railway Ministry Hospital.

The traction appliance, quite different from previous ones in traction method, is a new kind of medical appliance which treats spinal diseases, including slipped disk, and fracture and dislocation of the limbs.

It overcame the shortcomings of the previous spinal tractors by making the direction of traction and the spinal almost parallel. In case of long bone's fraction, it ensures the accuracy of treatment with the help of x-ray.

As it is easy to make and convenient for use, the traction appliance is popular among ordinary people, to say nothing of the experts and doctors.