A device (10) for extracting fluid from a lumen comprising a body (11), a first needle part (12) extending from a front part of the body (10) and a second needle part (23) that is extends from a rear part of the body (11), in which the body (11) includes an observation part (18) made of a transparent or semi-transparent material and adapted to allow visual observation of the fluid, and in which the observation part (18) is configured to improve the visibility of the fluid in the observation part (18), in which the body (10) includes a passageway therein, through which the first one is passed part of the needle and the second part of the needle, in which the passageway comprises a chamber part (22) along a part of its length, in which the diameter of the chamber part (22) it is larger than the diameter of the rest of the passageway so that a gap is formed between the first pair needle (12) and / or the second needle part (23) and an inner wall of the chamber part (22), characterized in that the first needle part (12) and the second needle part (23) they form opposite ends of a single needle, and because the observation part (18) is substantially aligned with the chamber part (23) so that the fluid entering the chamber part (23) through one or more openings (24) in the needle aligned with the chamber part (23) can be observed through the observation part (18).Un dispositivo (10) para extraer fluido desde un lumen que comprende un cuerpo (11), una primera parte (12) de aguja que se extiende desde una parte delantera del cuerpo (10) y una segunda parte (23) de aguja que se extiende desde una parte posterior del cuerpo (11), en el que el cuerpo (11) incluye una parte (18) de observación fabricada en un material transparente o semi-transparente y adaptada para permitir la observación visual del fluido, y en el que la parte (18) de observación está configurada para mejorar la visibilidad del fluido en la parte (18) de observación, en el que el cuerpo (10) incluye una vía d
