Abstract: Devices for injection of medicines into a human body are designed for one-time use during inpatient or outpatient treatment. The reuse of an injection device having a bellows 3 as an injection container is prevented by providing a locking attachment which prevents backward motion of a bottom 4 of the bellows 3 and which is mounted on elements of the device brought together during the injection (the bottom 4 of the bellows 3 and the housing/needle holder 1). A locking attachment is made in a form of a pair of interacting elastically deformable hooks 6 with a beveled catch and a female part in the form of a hole 7 with a ledge 8. At the instant the injection is completed, the sharpened end 10 of the needle 2 punctures a partition 9 in the bottom 4 of the bellows 3, further preventing reuse.