An injector device for dispensing at least two fluids in a sequential delivery includes a plunger located within an inner body, the inner body located within an outer body, a cannula comprising an entry opening integrally joined to the outer body, and at least one piercing member integrally joined with the outer body. In an embodiment, the piercing member includes a neck section and one or more slots that engage a membrane on the inner body so as to continue to allow release of the contents of a first liquid from the outer body just prior to commencement of the flow of a second liquid from the inner body.
