The present invention safety device is a one-piece needle assembly that has abase and a housing pivotally connected to the base. At the base there isformed longitudinally along its distal portion a catch mechanism that may bein the form of an anchor projection. At the back wall of the housing there isextended another catch mechanism that may be configured in the form of twoclasping fingers. Also providing in the housing is an integral hook. As thehousing and the base are pivoted relative to each other, and as the needlemakes contact with the hook, the respective catch mechanisms at the base andthe housing also make contact with each other, resulting in the coupling ofthe catch mechanisms and the coupling of the needle to the hook.