Controlled release drug dispersion delivery device
First Claim
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1. A drug delivery device for the controlled in situ production and release of a dispersion containing a beneficial agent, consisting essentially of:
- (A) a compressed core prepared from an admixture comprising(i) a therapeutically effective amount of a beneficial agent; and
(ii) a polymer which upon hydration forms gelatinous microscopic particles, the polymer selected from the group consisting of sodium polyacrylate and carboxypolymethylenes prepared from acrylic acid crosslinked with allylethers of sucrose or pentaerythritol and the pharmaceutically acceptable salts thereof;
(B) a water insoluble, water impermeable polymeric coating comprising a polymer and a plasticizer, which surrounds and adheres to the core, the polymer being selected from the group consisting of polyvinyl chloride, cellulose acetate, cellulose acetate butyrate or ethylcellulose, or combinations of these polymers, the plasticizer being selected from the group consisting of diethylphthalate, dibutylsebacate or triethylcitrate, the coating having apertures, exposing between about 1 and about 75% of the core surface, wherein the release rate of drug from the device is a function of the number and size of the apertures.
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Abstract
A device for the controlled delivery of a beneficial agent as a gelatinous dispersion consisting of (i) a core which contains a beneficial agent, a polymer which forms gelatinous microscopic particles upon hydration and if desired an agent to modulate the hydration of the polymer; and (ii) an impermeable, insoluble coating which adheres to and surrounds the core and contains apertures which provide an area for the hydration and release of a dispersion comprising gelatinous microscopic particles.
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Citations
18 Claims
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1. A drug delivery device for the controlled in situ production and release of a dispersion containing a beneficial agent, consisting essentially of:
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(A) a compressed core prepared from an admixture comprising (i) a therapeutically effective amount of a beneficial agent; and (ii) a polymer which upon hydration forms gelatinous microscopic particles, the polymer selected from the group consisting of sodium polyacrylate and carboxypolymethylenes prepared from acrylic acid crosslinked with allylethers of sucrose or pentaerythritol and the pharmaceutically acceptable salts thereof; (B) a water insoluble, water impermeable polymeric coating comprising a polymer and a plasticizer, which surrounds and adheres to the core, the polymer being selected from the group consisting of polyvinyl chloride, cellulose acetate, cellulose acetate butyrate or ethylcellulose, or combinations of these polymers, the plasticizer being selected from the group consisting of diethylphthalate, dibutylsebacate or triethylcitrate, the coating having apertures, exposing between about 1 and about 75% of the core surface, wherein the release rate of drug from the device is a function of the number and size of the apertures. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification