Abstract: A mixing and injection apparatus including a needle and a needle base, a syringe attachment element and a mixing chamber engagement assembly including a needle chamber surrounding the needle and a first liquid conduit portion, sealed from the needle chamber and a mixing chamber engagement portion including a second liquid conduit portion communicating with the first liquid conduit portion and configured for communication with a mixing chamber, the syringe attachment element and the needle base being configured to permit liquid communication between an interior of the syringe and the first liquid conduit portion when the syringe attachment element and the needle base are in the first relative engagement orientation and to permit liquid communication between an interior of the syringe and the needle when the syringe attachment element and the needle base are in the second relative engagement orientation, axially separated from the first relative orientation along the injection axis.
