Needle support assembly for a venous blood collection device with evacuated vial

Needle support assembly for a venous blood collection device with evacuated vial, comprising a support body which extends along a longitudinal axis between a first and a second end at which a coupling seat for a vein needle and coupling seat for a vial needle are respectively made, said support body being provided with an inner chamber having an entrance and an exit which communicate fluidically with the vein needle coupling seat and with the vial needle coupling seat respectively to permit the blood flow, said support body being made at least partially in transparent or semi-transparent material to permit the visualisation of such blood flow, characterised in that in relation to a section plane orthogonal to the longitudinal axis the inner chamber has a mean cross-section greater than the cross-sections of both the coupling seats and in that said inner chamber is divided into compartments communicating with each other which define one or more channels for the blood flow from the entrance to the exit, each channel defining a path for the blood which moves away from the straight line connecting the entrance and the exit and having a smaller cross-section than the mean cross-section of the inner chamber.