Patent ID: 6872201
Filing Date: 2005-03-29
Classification: A61K

Abstract:
1. An osmotic delivery system comprising: an enclosure, said enclosure having an interior for holding a beneficial agent, said interior having an interior surface; an osmotic agent located in said interior; a semipermeable body in liquid communication with said enclosure for permitting liquid to permeate through said semipermeable body to said osmotic agent; and a piston located within said interior of said enclosure, being movable with respect to said interior of said enclosure, defining a movable seal with said interior of said enclosure that separates said osmotic agent from said beneficial agent, and having a recess that receives a sleeve having an interior that receives at least a portion of said osmotic agent, said osmotic agent located between said piston and said semipermeable body, said osmotic agent for imbibing liquid from a surrounding environment through said semipermeable body to cause said piston to move and in turn cause delivery of said beneficial agent from said enclosure, wherein said osmotic agent consists of a semisolid or a solid.