Device using hydrophilic polymer for delivering drug to biological environment

摘要: A self-powered device for delivering drug is disclosed. The comprises (1) a substantially rigid housing, (2) collapsible container storing and having passageway the in (3) an expandable laminate positioned between housing container. (a) lamina formed of absorbent material laminated to (b) placed adjacent swellable hydrophilic polymer. In operation, when biological environment, fluid from environment imbibed by into causing expand exert pressure on container, thereby collapsing concomitantly pumping through at correspondingly controlled rate over prolonged period time.