For decades the "Green Tourniquet" has been setting standards for the congestion of veins. Doctors and medical personnel are using it as well for injections as for taking blood. Patients appreciate its especially skin-friendly tape and that the design avoids pinching skin or hairs. To the user the Green Tourniquet not only offers a very simple application but also a one-hand operation for congestion, decongestion and release. The design was completely revised: in its appearance as well as in its function. It now combines the two functions decongestion and release in one button; but at the same time, it avoids an unintentional release because a noticeable stopping point has to be exceeded. All parts have been optimized ergonomically. So the product not only pleases the hand but also automatically leads to a correct operation.