Patent ID: 7648496

Claim:
An implantable device for accurate delivery of an active agent, said device comprising: the active agent; a housing ( 2 ) including a reservoir ( 3 ) that contains the active agent; a valving and control mechanism ( 10 ) fitted at least partially within said housing ( 2 ) and fitted at least partially between the reservoir and an opening to an environment of use, wherein the valving and control mechanism comprises a valve seat member ( 12 ) peripherally sealed with respect to said reservoir and a plunger ( 18 ) adapted to slide with respect to said valve seat member ( 12 ) and said valving and control mechanism ( 10 ) is able to withstand pressure buildup in the reservoir during temperature and atmospheric pressure cycling during storage and capable of assuming an open configuration and a closed configuration, said valving and control mechanism ( 10 ) closes off said reservoir ( 3 ) when in said closed configuration, thereby preventing leakage of the active agent during storage in said device; and further wherein said valving and control mechanism ( 10 ) opens said reservoir ( 3 ) to a flow path when in said open configuration, thereby permitting controlled delivery of the active agent.