| 摘要 |
<p>A dispenser (10) for delivering a beneficial agent to an environment of use comprises a semipermeable wall (12) surrounding a compartment containing a heat responsive composition (16), and an expandable composition (17). A passageway (18) in the wall connects the compartment with the exterior of the dispenser. Fluid is imbibed through the wall (12), capsule wall (13) is dissolved, composition (17) swells and active agent is dispersed through the passageway (18). <IMAGE></p> |
