An injection device (10) comprising: a syringe (12) having a body (14) with a piston (18) disposed therein and an open distal end (22)； a needle assembly (26) comprising a cannula (30) and a luer connector (38) attachable with the distal syringe end, said luer connector comprises a connector (42) with a distal end (46) that supports said cannula and a proximal end mating with the distal syringe end, said connector includes a connector retention cavity (80) defined by an inner surface (84) and a step (88)； internal threads (52, 54) disposed at the distal end of the syringe and external threads (56, 58) arranged on said connector that allow coupling of coupling and ejection of the viscous fluid through said cannula when said piston operates, wherein said syringe includes a syringe decreasing cone and said inner surface of the connector is correspondingly decreasing with said syringe decreasing cone, to thereby provide a sealed seal between them, and wherein the decreasing syringe cone brakes dry the step of the connector retention cavity to create a dead space (92) when the needle assembly is tightened with torque in the syringe and seats to the maximum, characterized in that said cannula has a caliber of approximately 18 or greater, said threads internal have a passage between approximately 2 mm and 5 mm, and the injection device further comprises a viscous fluid (62) having a v Iscosity between approximately 50,000 centipoise and approximately 200,000 centipoise disposed in said body and injectable by said piston to a peripheral location of a human or animal body through said cannula.Un dispositivo de inyección (10) que comprende: una jeringa (12) que tiene un cuerpo (14) con un pistón (18) dispuesto en el mismo y un extremo distal abierto (22)； un conjunto de aguja (26) que comprende una cánula (30) y un conector luer (38) acoplable con el extremo distal de jeringa, dicho conector luer comprende un conectador (42) con un extremo distal (46) que soporta dicha cánula
