A Port-a-Cath is a catheter system, consisting of a port and a thin tube. The port is inserted under the skin, the tube inserted into a vein. The port of the Port-a-Cath has a special membrane on the side of the skin, which can be pierced up to 2000 times with a special needle (Gripper needle). Intravenous chemotherapies or a parenteral diet can be administered by means of such. If peripheral veins are destroyed or deserted by preceding frequent puncture, a Port-a-Cath is often necessary.