An injection device includes a housing having a proximal end and a distal end, the housing defining a distal opening, and a first opening in a side of the housing and between the proximal and distal ends； a propellant disposed inside the housing and spaced from the distal end； and a movable member disposed inside the housing and between the distal end and the propellant, wherein the propellant is in fluid communication with the movable member and the first opening.
