The present invention is a needle assembly (10) for collecting blood or other samples of discharge fluid in a container, wherein the needle assembly (10) comprises: a housing (12), a first needle connector ( 18) provided by said housing (12), a first hollow needle portion (20) mounted on said first needle connector (18) and extending from said first needle connector (18) in a distal direction in first needle (20) has a first sharp needle tip (22), a second needle connector (30) provided by said housing (12), a second hollow needle portion (32) mounted to said second needle connector (30) extending from said second needle connector (30) in a proximal direction, opposite said distal direction, wherein a hollow return chamber is disposed within the housing between the first needle portion (20) ) and the second needle portion (32), wherein the retention chamber communicates with the inner lumen provided within the first (20) and second (32) hollow needle portions, wherein the housing (12) is formed of transparent material at least in a region near the return chamber in that the return chamber is connected to the atmosphere by a passageway and wherein a filter (94) is provided within the passageway, wherein the filter (94) is designed to be air permeable for spillage outside the return chamber in the atmosphere, but prevents blood or other liquid samples contained in the return chamber from spilling through an opening in the atmosphere.a presente invenção se trata de uma montagem de agulha (10) para coletar sangue ou outras amostras de líquido para descarga em um recipiente, em que a montagem de agulha (10) compreende: um alojamento (12), um primeiro conector de agulha (18) fornecido pelo dito alojamento (12), uma primeira porção de agulha oca (20) montada no dito primeiro conector de agulha (18) e que se estende a partir do dito primeiro conector de agulha (18) em uma direção distal, em que a primeira agulha (20) tem uma primeira ponta de agulha afiada (22), um segundo
