The specification of the catheter base identified by the colors is easy to distinguish and use; Translucent, transparent catheter and needle hud design, is easy to observe blood return; The catheter contains three beams of development line, which can be developed under X-ray; The catheter is smooth and elastic, and has good flexibility, reducing the chance of catheter bending during indwelling, ensuring normal and stable infusion, and prolonging the indwelling time. The built-in blood air filter membrane can avoid direct contact between blood and air, and prevent unnecessary blood pollution; Model specifications: see the table below.