The present invention relates to a mixing and injector device which can include: a housing having a plurality of separate and distinct chambers disposed therein; one or more displacement mechanisms corresponding to each of the plurality of chambers disposed within the housing; a needle assembly being provided about one of the plurality of chambers, the needle assembly including the following: a septum; a needle being separated from the plurality of chambers by the septum, the needle having a proximal end configured to pierce the septum in an actuated state; and a needle carrier, the needle carrier being configured to translate axially with respect to and toward the septum and pierce the septum and provide fluid communication from the plurality of chambers through the needle in the actuated state.