Under DSA fluoroscopy, an elbow catheter is placed near the occluded segment of the vessel, a guidewire is placed through the catheter, and a laminated opening is made in the lateral wall of the artery with the guidewire to artificially form a lamina, at which point the head end of the guidewire is seen to bend into a collaterals under fluoroscopy. The guidewire and the catheter are passed through the subintimal lamina and gradually advance through the occluded segment, then the bend of the catheter is directed toward the true lumen of the artery and the guidewire is used to break through the intima into the true lumen of the vessel. Finally, balloon dilation or stent placement treatment is performed segment by segment.