Medical catheters can be generally divided into: 1. Infusion catheters; 2. Hemodialysis catheters; 3.Angiographic catheters 4. Catheters for endovascular interventional therapy 5. Gastrointestinal catheters 6.Respiratory catheter 7. Urinary catheter 8. Nervous system catheter 9. Surgical drainage tube, etc.