Delivery system comprising means for governing fluid ingress into the system.

摘要

A delivery system (10) is disclosed for delivering a beneficial agent (20) to an animal. The delivery system (10) comprises a wall (12) that surrounds a lumen (18) said wall (12) comprising a composition that limits the passage of fluid into the system and a composition that permits the passage of fluid into the system. The lumen (18) comprises a beneficial agent (20) and an expandable member (25). The delivery system (10) comprises an exit means (13) for delivering the beneficial agent (20).