The reusable tourniquet daisygrip enables blood samples to be taken under hygienic conditions and thus helps to prevent the transmission of infections in hospitals. The tube is made from a material that is easy-to-clean and skin-friendly at the same time, which prevents the skin from getting pinched. In addition, the uniformly smooth surfaces support effective disinfection. The locking mechanism with self-aligning magnets can be effortlessly and reliably operated with one hand.