Usage; Vertical traction overcomes the disadvantages of lying flat in the past. It can be used in walking, sitting and standing; Continuous traction and support: Continuous traction, continuous support (tens of hours is OK), consolidate the traction effect, let the injured lumbar get enough rest (when using, patients obviously feel no pressure on lumbar), compared with the previous traction, the treatment effect is more obvious, the cycle is shorter; Strong traction force:The 25 air expansion columns are evenly distributed around the waist and stretched at multiple points at the same time to ensure that the vertebral space is pulled apart;