nozzle device for administration of a beneficial agent in the environment of use particularly for administration of therapeutic compositions nutrients or to ruminant animals

摘要

The dispenser has a semipermeable wall forming an internal compartment which contains a beneficial agent, an expandable fluid absorbing member, a weight of density of at least 1.0 to maintain the dispenser in its environment of use and an exit in the wall to deliver the agent to the environment of use.