An injector arrangement (100) which allows the fat tissue to be drawn through a suction tip (108), stored inside a tube (101) without intervention or exposure to air and centrifuged finally in order to obtain fat based stem cells, comprising a modular piston (103) with a movable structure which allows drawing the fat tissue into the tube (101) through the said suction tip (108) by means of a piston tip seal (102), a piston shaft (105) with modular structure which allows the said modular piston (103) to move inside the tube (101) in forward and backward directions and which can be separated from the modular piston (103) in order to allow the tube (101) to be placed inside the present centrifuge device after the fat tissue is drawn inside the tube (101), and an O-ring (104) which engages into the O-ring seat (1033) formed on the hollow locking part (1031) with independent structure in order to make the hollow locking part (1031) with an independent structure introduced on the said modular piston (103) to act as a locking device during the centrifuge, or in other words, to prevent the fat tissue and split stem cells to leak outside the tube (101) during the centrifuge, wherein； it allows stem cells to be collected on the piston tip seal (102) with a concave structure without experiencing losses during the upside down centrifuge.Agencement d'injecteur (100) qui permet au tissu gras d'être aspiré par l'intermédiaire d'une pointe d'aspiration (108), rangée à l'intérieur d'un tube (101) sans intervention ni exposition à l'air et centrifugé enfin afin d'obtenir des cellules souches à base de graisse, comprenant un piston modulaire (103) avec une structure mobile qui permet d'attirer le tissu gras dans le tube (101) par l'intermédiaire de ladite pointe d'aspiration (108) au moyen d'un joint de pointe de piston (102), un arbre (105) de piston ayant une structure modulaire qui permet audit piston modulaire (103) pour se déplacer à l'intérieur du tube (101) vers l'avant et vers
