The main purpose of interventional treatment for malignant obstructive jaundice is to drain bile, reduce bile duct pressure, and reduce the backflow of harmful factors such as bile salts or bacterial toxins into the blood to facilitate recovery of liver function and subsequent treatment. Percutaneous transluminal bile duct drainage (PTBD) and biliary stent placement (PTBS) are performed using percutaneous transluminal bile duct dilatation, applying guidewire and catheter techniques, probing through the narrowed and occluded obstructed segment, and determining the site and length of the narrowed segment before placing a drainage tube or metal stent. By placing a stent across the obstructed part of the bile duct, bile is diverted into the digestive tract for the purpose of unblocking the bile duct. The method is to insert a guidewire into the intrahepatic bile duct via percutaneous hepatic puncture and pass it through the obstruction site to reach its lower part, then send in a balloon to gradually dilate the stenosis, and finally place the stent along the guidewire to the obstruction site, so that it crosses the obstruction site and the two ends are located at the proximal and distal ends of the obstruction site, so that the bile at the distal end can be drained to the proximal end through the stent lumen to achieve the in vivo drainage of bile, which has the advantage of no bile loss and less influence on the bile The advantage is that there is no loss of bile and the physiological effect of bile is less affected, and it does not interfere with the patient’s daily life.