Controlled release drug suspension delivery device
First Claim
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1. A drug delivery device for the controlled in situ production and release of a suspension containing a beneficial agent, consisting of:
- (a) a compressed core which comprises at least two layers, wherein at least one layer comprises an admixture of a therapeutically effective amount for those in need thereof, of a pharmaceutically active ingredient and a polymer which upon hydration forms microscopic polymer gel beads selected from the group consisting of sodium acrylate polymers and carboxypolymethylenes prepared from acrylic acid cross-linked with allyl ethers of sucrose or pentaerythritol; and
at least one other layer comprising a polymer which upon hydration forms microscopic polymer gel beads; and
(b) a water insoluble, water impermeable coating applied to the core, 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 dibutylsebacate or triethylcitrate, the coating having apertures, exposing between about 5 and about 75% of the core surface.
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Abstract
A device is disclosed for the controlled delivery of a beneficial agent, the device consisting of (i) a core comprising at least two layers, wherein at least one layer comprises a beneficial agent and a polymer which forms microscopic gel beads upon hydration and at least one layer which comprises a polymer which forms microscopic gel beads upon hydration; 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 the microscopic gel beads.
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Citations
23 Claims
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1. A drug delivery device for the controlled in situ production and release of a suspension containing a beneficial agent, consisting of:
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(a) a compressed core which comprises at least two layers, wherein at least one layer comprises an admixture of a therapeutically effective amount for those in need thereof, of a pharmaceutically active ingredient and a polymer which upon hydration forms microscopic polymer gel beads selected from the group consisting of sodium acrylate polymers and carboxypolymethylenes prepared from acrylic acid cross-linked with allyl ethers of sucrose or pentaerythritol; and
at least one other layer comprising a polymer which upon hydration forms microscopic polymer gel beads; and(b) a water insoluble, water impermeable coating applied to the core, 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 dibutylsebacate or triethylcitrate, the coating having apertures, exposing between about 5 and about 75% of the core surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification