Interventional radiology is developed on the basis of new technologies such as diagnostic imaging, selective or super-selective angiography, fine needle aspiration and cytopathology. It includes two basic elements: (i) non-surgical treatment of some diseases under imaging surveillance using techniques such as catheters based on diagnostic imaging. ② Under imaging surveillance, percutaneous puncture, catheters and other techniques are used to obtain histological, bacteriological, physiological and biochemical information to clarify the nature of the lesion. Interventional radiology is guided by imaging medicine and provides new routes of drug delivery and surgical methods for modern medical treatment. Compared with traditional drug delivery and surgical methods, it is more direct, effective, simple and minimally invasive. Interventional radiology treatment plays an active role in cancer treatment and has become an indispensable new treatment method. The following methods are commonly used in interventional radiology treatment: (1) Intra-arterial infusion of anti-cancer drugs, which makes the concentration of drugs in the tumor much higher than that of general peripheral intravenous administration, so that the therapeutic effect is significantly improved and the systemic adverse effects are significantly reduced. It is suitable for the treatment of liver cancer and lung cancer, and also used for the treatment of head and neck tumors, gastric cancer, bile duct tumors, pancreatic cancer, pelvic tumors and malignant tumors of the extremities. (2) Arterial embolization therapy inserts a catheter into the blood supplying artery of the tumor, selects an appropriate embolic agent, fills the blood supplying artery, intercepts the blood supply of the tumor, and infarcts the tumor. It is suitable for the treatment of liver and kidney as well as pelvic tumors, and also for the emergency treatment of bleeding caused by tumors. (3) Transcatheter decompression it is mainly used to relieve the obstruction symptoms caused by the compression of tumor on bile duct or urethra. Since this method is less invasive than surgical operation, it is especially suitable for old and frail patients, thus it is more widely used. Devices and materials used Instruments Various special catheters, guide wires, puncture needles, vascular sheaths, balloons, and biopsy needles. Materials Endoprosthesis, embolization materials (aqueous, viscose, gelatin sponge, real silk wire segments, various special micro-particles such as PVA, detachable balloons, steel rings, etc.), filters, drainage catheters.