An injection device with a detachable actuating piston, actuated by spring tension, to automatically perform the puncture and injection by means of an injection cartridge provided with a needle, which cartridge is inserted interchangeably and coaxially with respect to the piston in the closed device box on the side of the needle with a removable lid, the cartridge being held at one end by the plunger and at the other end by the lid, which has a hole to allow the passage of the injection needle, characterized by the the fact that the plunger is completely housed inside the closed box and when the apparatus is in a ready state it is in contact with the container's container on top of the liquid content thereof, on which continent the injection needle is secured., being suddenly separated from the liquid and which continent is supported in an axially displaceable manner inside the lid capped of the box which cover in disarmed state, can be placed with its bottom on the front side of the plunger in order to serve to push back the latter by hand against the tension of the spring. (Machine-translation by Google Translate, not legally binding)
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