A mixing and/or reconstitution system which simplifies the reconstitution and/or mixture of a first material and a second material compared to existing devices. Further it prevents user misuse. The mixing and/or reconstitution system comprising—an adaptor (100, 100′, 100″, 300),—an integrated injection device (140, 340) removably attached to the adaptor (100, 100′, 100″, 300) comprising a switching element (155, 355),—a first reservoir (121, 341) containing a first material, wherein the first material is a fluid, and—a trigger (110, 126, 344), wherein the adaptor (100, 100′, 100″, 300) further comprises ⋅a first attachment location, e.g. a recess (101, 301), adapted to attach a vial (160, 360), wherein the vial (160, 360) contains a second material within a second reservoir (161, 361), wherein the second material contains a medicament formulation, ⋅a first connection element, e.g. a first needle (107, 307), ⋅a flow channel (108, 108a, 308) providing fluid communication of the switching element (155, 355) and the first connection element, ⋅a sensing arrangement (104, 117, 346, 385) for detecting a pre-defined position of the vial (160, 360) at the first attachment location, and an interlock element (114, 346) which is adapted to allow operating the trigger (110, 344) in order to establish a fluid communication between the first connection element and the first reservoir (121, 341) only if the sensing arrangement (104, 117, 346, 385) detects the pre-defined position of the vial (160, 360) at the first attachment location.L'invention concerne un système de mélange et/ou de reconstitution qui simplifie la reconstitution et/ou le mélange d'une première matière et d'une deuxième matière par rapport aux dispositifs existants. En outre, il empêche une mauvaise utilisation par l'utilisateur. Le système de mélange et/ou de reconstitution comprend - un adaptateur (100, 100', 100", 300), - un dispositif d'injection intégré (140, 340) fixé amovible à l'adaptateur (100, 100', 100
