Device 1 100 200 300 for collecting blood or a blood compound, characterized in that it comprises a tube 10 that extends along a longitudinal axis 11 and has a side wall 12, a closed distal end 13, an end proximal 14 opposite the distal end 13 and an inner cavity 15 communicated with the outside by an opening 16 at said proximal end 14 a piston assembly 50 250 350 movable along the inner cavity 15 of the tube 10, delimiting said piston assembly 50 250 350 a space 15a between the piston assembly 50 250 350 and the distal end 13 of the tube 10 a handle assembly 30 130 330,which has a grip portion 32 132 and an end portion 34 134 334, and a pierceable sealing element 70 270 370 where the device 1 100 200 300 is adapted to adopt a forward position in which the handle assembly 30 130 230 pushes the piston assembly 50 150 250 towards the distal end 13 and is not clipped to the piston assembly 50 150 250,and in which air housed in space 15a is dislodged through the piston assembly 50 150 250 i through a space between the piston assembly 50 150 250 and the side wall 12 of the tube 10 and where the device 1 100 200 300 is adapted to adopt a recoil position in which the end portion 34 134 334 of the handle assembly 30 130 230 is clipped to the piston assembly 50 150 250 and pulls the piston assembly 50 150 250 toward the proximal end 14, and in which the piston assembly 50 150 250 and the perforable sealing element 70 270 370 tightly seal the space 15a.Dispositivo 1 100 200 300 de recolección de sangre o de un compuesto sanguíneo, que se caracteriza porque comprende un tubo 10 que se extiende a lo largo de un eje longitudinal 11 y que presenta una pared lateral 12, un extremo distal 13 cerrado, un extremo proximal 14 opuesto al extremo distal 13 y una cavidad interior 15 comunicada con el exterior por una abertura 16 en dicho extremo proximal 14 un conjunto pistón 50 250 350 desplazable a lo largo de la cavidad interior 15 del tubo 10, delimitando dicho conjunto pistón 50 250
