The present invention relates to a closed drainage device (1) comprising: apre-evacuated chamber (2); a drainage tube (3) connecting the pre-evacuatedchamber (2) to a needle (4); and a clamp (5) attached to the connecting tube(3), wherein the clamp (5) is in a first position that maintains the vacuum ofthe pre-evacuated chamber and has a second position that does not maintain thevacuum of the pre-~evacuated chamber.
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