A device for the release of a diffusible solid in a fluid medium which comprises a disc which comprises a substantially uniform mixture of said diffusible solid and a polymer which is insoluble in and impermeable to said fluid medium and impermeable to said diffusible solid. The surfaces of said disc...http://www.google.fr/patents/US4663147?utm_source=gb-gplus-shareBrevet US4663147 - Disc-like sustained release formulation
