Medical PTCD catheter

A medical PTCD catheter effectively solves the problem that bacterial intestinal juice flows back into the biliary tract to cause infection. According to the technical scheme, the medical PTCD catheter comprises a drainage bag, a discharge outlet is formed in the bottom of the drainage bag, a catheter body is connected to the upper portion of the drainage bag and comprises a drainage tube and a conveying tube located in the drainage tube, the conveying tube is longer than the drainage tube, the drainage tube is arranged in a bile duct, the conveying tube is arranged in a duodenum, and the drainage tube is connected with the drainage bag. The drainage tube and the conveying tube are both one-way channels, the drainage tube can introduce bile in the bile duct into the drainage bag, and the conveying tube can convey the bile in the drainage bag into the duodenum; the conveying pipe is arranged in the enteric cavity and is a one-way channel, only external substances can be conveyed into the enteric cavity, the su