Sustained release compositions
AssigneeBeecham Group Limited
InventorsMalcolm D. Brewer, Gerald J. L. Griffin
Life of this patent
Estimating the term…
Abstract
Sustained release composition comprising a water soluble veterinary medicament dispersed in a sheet of water insoluble polymer, which sheet is of a size and composition such that it is capable of being constrained in a position which allows oral administration and is, in the rumen, capable of moving relative to this position to retain the composition therein.
Claims24
A device adapted for administration to ruminants comprising a water soluble veterinary medicament dispersed in a resilient sheet of water insoluble ethylene-vinyl acetate copolymer, said medicament being present in an amount corresponding to 30 to 75% by weight of said sheet, said copolymer sheet being of a size and composition such that it is capable of being constrained by constraining means in a rolled-up configuration which permits oral administration, said constraining means being operable to release said constrained sheet in the rumen environment, said sheet when unconstrained thereby assuming an unrolled configuration favoring retention thereof in the rumen.
A device according to claim 17 wherein the film polymer contains about 41.7% vinyl acetate.
Dependencies are inferred from the claim text.