Peripheral venous catheter
In medicine, a peripheral venous catheter (PVC), peripheral venous line or peripheral venous access catheter is a catheter (small, flexible tube) placed into a peripheral vein for intravenous therapy such as medication fluids. Upon insertion, the line can be used to draw blood.
The catheter is introduced into the vein by a needle (similar to blood drawing), which is subsequently removed while the small tube of the cannula remains in place. The catheter is then fixed by taping it to the patient's skin (unless there is allergy to adhesives). Newer catheters have been equipped with additional safety features to avoid needlestick injuries. Modern catheters consist of synthetic polymers such as teflon (hence the often used term 'Venflon' or 'Cathlon' for these venous catheters). In 1950 they consisted of PVC plastic. 
A peripheral venous catheter is the most commonly used vascular access in medicine. It is given to most emergency department and surgical patients, and before some radiological imaging techniques using radiocontrast, for example. In the United States, more than 25 million patients get a peripheral venous line each year.
A peripheral venous catheter is usually placed in a vein on the hand or arm. It should be distinguished from a central venous catheter which is inserted in a central vein (usually in the internal jugular vein of the neck or the subclavian vein of the chest), or an arterial catheter which can be placed in a peripheral as well as a central artery. In children, a local anaesthetic gel (such as lidocaine) is applied to the insertion site to facilitate placement.
Insertion of a venous cannula can be a painful procedure that may cause anxiety and stress. Use of a vapocoolant immediately before cannulation reduces pain during the procedure, without increasing the difficulty of cannulation. Infection, phlebitis, extravasation, infiltration, air embolism, hemorrhage (bleeding) and formation of a hematoma (bruise) may occur.
Because of the risk of insertion-site infection the CDC advises in their guideline that the catheter needs to be replaced every 96 hours. However, the need to replace these catheters routinely is debated. Expert management has been shown to reduce the complications of peripheral lines.
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