One animal injects (4), its injection for being used to manage a medicament, its sleeve (700) for carrying out self-contained medicament, including animal injection: a casing (300), it is configured to receive a cartridge assembly (600) at least one cartridge retention component (808) when being inserted in casing opening (302) along a longitudinal axis with casing compartment (302) One injector (200) is configured to support cartridge assembly (600), by being suspended to along the direction opposite for vertically moving and being spring-loaded in receiving direction. Casing compartment (302) is extended in the first guide part angle (314) with the first guide members (312) are upcountry extended in the first distance from casing opening (301) with a first part (310) and is spaced apart to form a channel (316) in channel angle (318) between inside the first guide members (312) Wherein when being inserted in casing opening (301), inside the first guide members (312) the first hole of form (320) receives cartridge assembly (600). Casing compartment (302) has a second part (330) for the shape of an annular in the second distance from casing opening (301), and what with the second guide members (322) with the first face (324), it surrounded that the steering shaft and being disposed according to angle to longitudinal axis at least partly extends on channel angle (318) is the inclined angle for adjusting (314) with the first guide part.
