Patent ID: 7621907

Claim:
An implantable medicament delivery device comprising: a basin constructed and arranged to contain the medicament, said basin being surrounded by a basin containment portion formed from a non-permeable material; one or more screens, each screen of the one or more screens including a predetermined pattern of bi-directional flow empty holes for controlling the free flow of dissolved medicament therethrough, each pattern of holes of each screen being encircled by a band constructed and arranged to cover the top or bottom of said basin when said band is affixed to said basin containment portion, each screen of the one or more screens having a thickness from about 0.05 mm to about 0.5 mm and said bi-directional flow empty holes having a size from about 0.2 microns to about 100 microns; wherein the bi-directional flow empty holes assure that a required amount of medicament is delivered at a needed flow rate therethrough and wherein said flow rate is based upon one or more factors selected from the group including solubility of the medicament, medicament dissolution rate and medicament concentration and wherein the bi-directional flow empty holes are the exclusive mechanism for controlling the free flow of dissolved medicament and wherein the basin is arranged to contain the medicament without containing any plunger or alternative device for aiding flow of the dissolved medicament.