Central venous catheters are also called vascular access device. It is a long, thin, flexible tube used to give medications, fluids, nutrients, or blood products over a long period of time, usually several weeks or more. The catheter is inserted through the skin into a vein often in the neck or chest. It is threaded through the vein until it reaches a large vein near the heart. It is used to give long-term medication treatment for pain, infection, cancer, or to supply nutrition. A central venous catheter can be left in place far longer than an intravenous catheter, which gives medications into a vein near the skin surface. It is also used to measure the blood pressure in the superior vena cava, which helps to diagnose certain heart problems.

Centrifuge is a piece of equipment, which is driven by a motor, that puts an object in rotation around a fixed axis, applying force perpendicular to the axis. The centrifuge works using the sedimentation principle, where the centripetal acceleration is used to separate substances of greater and lesser density. Centrifuges are used in biology & biochemistry for isolating and separating biomolecules, cell organelles or whole cells.