Patent ID: 8080259

Claim:
A method of assembling components to form an implantable, fluid-imbibing device for delivering an active agent to a fluid environment of use, comprising: providing an impermeable reservoir comprising an interior surface; inserting a piston into the reservoir to divide the reservoir into a water-swellable agent chamber and an active agent chamber, wherein the water-swellable agent chamber has an open end and the active agent formulation chamber has an open end; inserting a water-swellable agent into the water-swellable agent chamber of the reservoir; inserting a water-swellable semipermeable plug into the open end of the water-swellable agent chamber of the reservoir, wherein the semipermeable plug is received in sealing relationship with the interior surface of the reservoir; inserting an active agent formulation into the active agent formulation chamber of the reservoir; and inserting a back diffusion regulating outlet into the open end of the active agent formulation chamber of the reservoir, wherein the reservoir interior surface and back diffusion regulating outlet have surfaces in a mating relationship.