Technical principle The tuberculosis cavity in which the tubercle bacilli proliferate 109-12, is the main source of infection of tuberculosis. In the past 30 years, no new effective anti-tuberculosis drugs have been introduced worldwide, and there are only about 10 kinds of anti-tuberculosis drugs available for clinical use, and the drug resistance rate of tuberculosis bacilli is over 40%. Direct injection of anti-tuberculosis drugs into the cavity or lesion through interventional techniques can significantly improve the treatment effect and shorten the elimination period to reduce patient infectivity. Technique Under radiological surveillance, a catheter is inserted into the cavity under bronchoscopic guidance and, after confirmation by contrast, an anti-tuberculosis drug-containing gel is injected. Since the drugs are released slowly locally in the lesion and take a long time to work, treatment can be given once every 2-3 weeks, with 3-4 times for mild cases and more than 10 times for severe cases, with an average of 6-7 times Efficacy Conventional treatment of drug-resistant tuberculosis requires long-term (18-24 months) and combined (5-6 types of) drugs, and patients often have difficulty completing the course of treatment and lose confidence in overcoming the disease due to poor efficacy, high costs and many side effects. Repeatedly hospitalized several times. At present, the cure rate of multidrug-resistant and relapsed tuberculosis in international and domestic treatment is less than 55%, but the combination of this method can increase to more than 85%, saving medical costs and reducing the source of tuberculosis infection. Indications 1, cavitary tuberculosis 2, drug-resistant tuberculosis 3, relapsed, refractory tuberculosis 4, diabetes combined with tuberculosis