Abstract: A device includes a hollow body delimiting a cavity for receiving the fluid, which cavity opens in a proximal opening and at least one distal opening for sampling and/or reinjection and a piston movably mounted in the receiving cavity to obturate the proximal opening. The device includes an assembly for selective distribution of a proximal part of the fluid located in the receiving cavity, including a fluid circulation channel that passes through the piston, which channel opens into the receiving cavity. The circulation channel and/or a distribution channel is able to cooperate or to communicate with an additional flow regulation device which can be manually actionable.