Central venous catheter Size of central venous catheter 1. Single lumen 14ga/16ga/18ga/20ga/22ga, with length 13---30cm 2. Double lumen 5fr/7fr, with length 13--30cm 3. Triple lumen 5.5fr/7fr, with length 13--30cm Components: Catheter with clamp; 5ml syringe; introducer needle; guide wire with advancer; dilator; catheter clamp; 7# needle; injection cap, blue gw syringe