Auto injector with cartridge retention system

Abstract

An auto injector () for administering injection of a medicament from a cartridge () containing the medicament, the auto injector comprising: a cartridge receiver () with a cartridge receiver compartment () configured to receive a cartridge assembly () with at least one cartridge retention member () when inserted through a cartridge receiver opening () along a longitudinal axis; and an ejector () configured to support the cartridge assembly () by being suspended to move along the longitudinal direction and being spring-loaded in the direction opposite of the receiving direction. The cartridge receiver compartment () has a first section (), at a first distance from the cartridge receiver opening (), with inwardly extending first guide members () that extends over first guide member angles () and are spaced apart to form a passage () at passage angles () between the inward first guide members (); wherein the inward first guide members () form a first bore () accepting the cartridge assembly () when inserted through the cartridge receiver opening (). The cartridge receiver compartment () has a second section () with an annular shape, at a second distance from the cartridge receiver opening (), and with second guide members () with first faces () that are inclined about a radial axis to the longitudinal axis and angularly arranged to extend at least partly over the passage angles () and the first guide member angles ().