Abstract: Method for producing a one-piece stopper with a carrier body of an elastomeric material and an inert layer, the carrier body having a disk-shaped outer portion and an inner portion that protrudes in the manner of a spigot from the outer portion. The inner portion is molded under the effect of heat in a molding tool from a sheet of elastomeric material and an inert film and subsequently punched out. The outer portion is molded onto the inner portion by means of injection molding, whereby the stopper is given its final form.

Abstract: A method and a needleless injection system for administering a medication. In order to simplify as far as possible the handling necessary for loading the injector with medication and thereby eliminate risks caused by a complex handling the method and system according to the invention provide loading of medication into a needleless injector device by means of a syringe prefilled with a medication, this loading step preferably including connecting the syringe to the injector device by means of a suitable coupling member or adapter and operating the syringe for transferring medication prefilled therein into the injector device. After this transfer the syringe and/or the coupling member or adapter are detached from the injector device, which is then ready to be operated for ejecting the loaded dosage of said medication from the injector device and thereby pass the selected dosage through the skin of an injection receiver.