A PICC is a long, thin, flexible tube known as a catheter. It is inserted into one of the large veins of the arm near the bend of the elbow. It is then slid into the vein until the tip sits in a large vein just above the heart.
The space in the middle of the tube is called the lumen. Sometimes the tube has two or three lumens (known as double or triple lumen). This allows different treatments to be given at the same time. At the end of the tube outside the body, each lumen has a special cap, to which a drip line or syringe can be attached. Sometimes there is a clamp to keep the tube closed when it is not in use.
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