A device for administering a product (e.g. a medicinal or therapeutic substance), the device including a receptacle for the product or constituents of the product and a casing, wherein the receptacle and casing are engaged, and an outer sleeve, wherein the casing can be moved relative to the receptacle into the outer sleeve.本發明係揭露一種雙腔體安瓿之混合裝置,係提供一液體產物,包含一安瓿容器係提供容納一液體產物及一外罩。外罩與安瓿容器係具有螺紋囓合。此裝置係包含一外套筒,其中外罩係可移動於相對之安瓿容器,於外套筒內。