4-pole collector tube is suitable for tube 4 trolley line, a single brush and brush double points, the use of copper alloy graphite brushes patented formula, wear factor, long service life. Pushing or pulling the fork passing move to collector and appropriately adjust the impact of transmission errors and transmission. Fixation and maintain catheter sheath protecting slip deformation wire connector joints, improve the safety and reliability of the product. Ends jacket is to protect and enhance the safety factor slide wire products. The top end portion of the catheter into the box by means of introducing supply current.