Figure 1.

A) The piercing needle used for venipuncture has a stainless-steel hollow shaft with a concentric hole on the bevel end; B) a winged needle or “butterfly” has a pair of winglets attached at the base of the shaft, that fold for handling or lay flat for stabilization, and a connection tubing which carries the blood to the collecting tube; C) the dispensing needle, which is fixed into the inner side of tube holder, pierces the rubber stop of the tube allowing the blood to be drawn; D) the Sarstedt’s hybrid system has a collecting tube with a plunger that can be used to withdrawn the blood during venipuncture or pulled before to evacuate the tube.