The insertion or replacement of a venous catheter (insertion of a plastic catheter) in a peripheral or central vein is performed by appropriately trained nursing staff, at the recommended frequency according to the physician’s instructions. The purpose of using the venous catheter is to administer fluids, medications, blood products, and parenteral nutrition solutions, to monitor the patient’s hemodynamics, as well as to allow for hemodialysis in the case of a Central Venous Catheter. Additionally, full information is provided regarding the movements the patient is allowed to make. The insertion of a venous catheter must be performed with precision and a strict aseptic procedure to achieve the desired therapeutic effect and to avoid complications.