The needle shut-off nozzle is provided in a housing for delivering polymer melt to an injection molding machine or an injection molding tool. The antibiotic and the analgesic are dissolved in the solvent to form a formulation that is suitable for veterinary applications. The first laser beam irradiation means and the second laser beam irradiation means are set such that at least a part, in the processing feed direction, of the focus spot of the second pulsed laser beam overlaps the focus spot of the first pulsed laser beam. A further alternative embodiment of the locking mechanism includes a sleeve which engages the telescopic engagement mechanism to restrict movement. The nuts 12, 12 are respectively rotated by driving motors 15, 15.