Interventional therapy is a marginal discipline that developed rapidly in the late 1970s. It is a series of techniques to diagnose and treat various diseases by using catheters, guidewires and other devices under the guidance of medical imaging equipment, based on diagnostic imaging and clinical diagnostics, combined with the principles of clinical therapeutics. In other words, under the guidance of imaging medicine (X-ray, ultrasound, CT, MRI), a specially designed catheter or device is inserted into the lesion site for diagnostic imaging and treatment through a percutaneous puncture route or through the body’s original orifice. The procedure involves the collection of tissue for cytology, bacteriology and biochemistry. We are familiar with coronary stents, cerebral aneurysm embolization, etc. all belong to the category of interventional treatment. There are many types of interventional treatments and many tools, but the basic techniques are similar and include, in layman’s terms, “irrigation, plugging, access, elimination, and extraction”. In the next few articles, we will introduce the techniques of “irrigation, plugging, access, elimination and extraction” in detail to facilitate your understanding.