| abstract |
A device is disclosed for delivering a beneficial agent. The device comprises (1) a housing defining an internal space (2) a piston in the housing separating the space into an agent compartment and a power compartment, or a flexible container in the space, (3) an opening in the housing connecting the agent compartment or the container with the exterior of the housng, and (4) an osmotic device in the power compartment or beneath the container. |