A central venous access device/catheter is a device whose tip must terminate in the brachiocephalic (innominate) or iliac vein, subclavian, the superior or inferior vena cava or the right atrium. The physician inserts the device beneath the skin to draw blood or administer medication and nutrients to the patient. Tunneling describes a technique in which the physician places a long catheter under the skin between the vein entry and external access sites.
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