Abstract: A syringe for injecting a pasty material comprising: a main cylindrical body; a piston slidable in the body; and a tube slotted in the largest part of its length and provided with a handling ring at its rear part, the internal diameter of the main cylindrical body substantially corresponding to the external diameter of the tube so that, when the tube is arranged into the cylinder, this set defines an injection chamber delimited by the internal wall of the tube and, in front of the slot of the tube, by the internal wall of the cylindrical body.