An injection device for receiving a syringe therein and for delivering a dose of medicament from the syringe, the injection device comprising: a driver mechanism (204) retainable in a primed state and releasable from the primed state for driving one or more features of the injection device forwards, a trigger mechanism (202) comprising a ramped surface (230) engaged with the driver mechanism to retain the driver mechanism in the primed state, the trigger mechanism being configured on actuation thereof to withdraw the ramped surface from engagement with the driver mechanism for release thereof.一種用於將注射器接納在其中以及輸送來自注射器的一定劑量的藥劑的注入設備，該注入設備包括：能夠保持處於待發狀態且能夠從待發狀態中釋放以向前驅動注入設備的一個或多個特徵件的驅動機制（204） ，包括了與驅動機制相嚙合而將驅動機制保持在待發狀態的傾斜表面（230）的觸發器機制（202），該觸發器機制被配置成在致動時撤除該傾斜表面與驅動機制的嚙合，以便將其釋放。
