A needle assembly (210, 410, 510) comprising: a transparent or translucent housing (212, 312, 412, 512) defining a housing interior (220, 320)； a cannula (236, 336, 436) having a first puncture tip (338, 438) extending from a first end (414) of the housing (212, 312, 412, 512)； a second puncture tip (260, 462) extending from a second end (416) of the housing (212, 312, 412, 512), the second puncture tip and the first puncture tip are in fluid communication with each other through the cannula, where the only communication path between the interior (220, 320) of accommodation and the external environment is through the first puncture tip； and a porous vent (910, 910a) positioned inside the housing interior (220, 320) to separate the housing interior into a first chamber (426, 526) and a second chamber (427, 527a, 527b), the porous vent (910, 910a) positioned in such a way that the first chamber has a volume of about 5 percent to about 20 percent of the total volume of the interior (220, 320) of housing with the cannula in fluid communication with the First chamber (426), the porous vent (910, 910a) includes pores that extend therethrough to provide a flow path between the first chamber (426) and the second chamber (427, 527a, 527b) the pores are they adapt for passage of at least partially rapid fluid blood to the porous vent (910, 910a) without sealing the pores to the blood.Un conjunto de aguja (210, 410, 510) que comprende: un alojamiento transparente o traslúcido (212, 312, 412, 512) que define un interior (220, 320) de alojamiento； una cánula (236, 336, 436) que tiene una primera punta de punción (338, 438) que se extiende desde un primer extremo (414) del alojamiento (212, 312, 412, 512)； una segunda punta de punción (260, 462) que se extiende desde un segundo extremo (416) del alojamiento (212, 312, 412, 512), la segunda punta de punción y la primera punta de punción están en comunicación de fluidos entre sí a través de la cánula, en donde el único recorrido de
