For patients who will be reciving chemotherapy or who will be getting multiple needle injections they may get a Central Venous Access Device (CVAD). The principle of a CVAD is to make it easier and more convenient for the patient to draw blood, and to receive fluids and chemotherapy. A CVAD is built of two components named the catheter and the chamber. The chamber a very small toonie shaped object. The chamber is the component where blood is drawn from and the fluids or medication is injected. The catheter is tinny bendable pipe where the medicine makes its way to a major artery. The CVAD can be inserted for months or years and causes very little discomfort. The CVAD will only be slightly visible, looking like a bevelled area under the skin.