Osmotically driven active agent dispenser.

摘要

An osmotically driven dispenser (10) for dispensing an osmotically effective active agent composition (17) into a water containing environment comprising a water insoluble two layer laminated wall of an inner semipermeable lamina (14) and an outer microporous or hydrogel lamina (12), the wall defining an inner compartment (16), an osmotically effective active agent composition (17) contained within the compartment (16), and an outlet passageway (15) through the wall from which the active agent composition (17) is dispensed characterized in that the wall includes a third layer (13) of a water soluble composition located between the inner semipermeable lamina (14) and the outer microporous or hydrogel lamina (12) and the passageway (15) extends through the inner semipermeable lamina (14) from the compartment (16) to the third layer (13).