Central Line >34 Weeks Kit. Cardiology department. || The Central Line >34 Weeks Kit (DYNDC1987A) is intended for use on patients greater than 34 weeks of age. The central venous catheter, also called a central line, is a long, thin, flexible tube used to give medicines, fluids, nutrients, or blood products over a long period of time, usually several weeks or more. A catheter is often inserted in the arm or chest through the skin into a large vein. The catheter is threaded through this vein until it reaches a large vein near the heart.