| 主权项 |
1. An apparatus for the controlled release of an active agent into an aqueous system for a prolonged duration of time, the apparatus comprising:
(a) a container comprising a polymeric layer, said polymeric layer forming a reservoir for housing a volume of active agent and exposing at least a partial surface of said active agent to fluid communication with the aqueous system; (b) at least one opening in the container connecting the reservoir with the exterior of the apparatus, said opening facilitates the passage of fluid into the reservoir and the release of fluid and active agent from the reservoir; and (c) wherein, when the apparatus is in operation with an aqueous system of use, the active agent having at least a partial surface exposed to fluid communication with the aqueous system is dissolved and released into the aqueous system at a controlled rate proportional to the surface area of active agent in fluid communication with the aqueous system and dissolution of the volume of active agent occurs over a prolonged duration of time proportional to the total volume of active agent. |
