Oral osmotic controlled drug delivery system for a sparingly soluble drug
First Claim
1. An oral osmotic controlled drug delivery system for a sparingly soluble drug comprising:
- a. a wall made of acylated cellulose, b. a core surrounded by the wall, the core comprising (i) finely particulate anhydrous carbamazepine, (ii) a mixture of xanthan gum and croscarmellose sodium as a polymeric swelling agent which exhibits controlled swelling and the wall does not rupture or burst, (iii) a crystal habit modifier in whose presence, upon contact with an aqueous medium, the anhydrous carbamazepine is transformed into cuboidal or rod-shaped crystals of the dihydrate of carbarnazepine, or mixtures thereof, and (iv) a water-soluble compound for inducing osmosis, the wall being impermeable to the components of the drug-containing core, but permeable to water, and c. a passageway through the wall for releasing the components present in the core to the surrounding environment.
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Accused Products
Abstract
The present invention is for an oral osmotic controlled drug delivery system for a sparingly soluble drug comprising:
a. a core comprising (i) finely particulate anhydrous carbamazepine (ii) a polymeric swelling agent consisting of one or more swellable hydrophilic polymers selected such that the polymeric swelling agent exhibits controlled swelling and the wall does not rupture or burst, (iii) a crystal habit modifier in whose presence, upon contact with an aqueous medium, the anhydrous carbamazepine being transformed into cuboidal or rod-shaped crystals of the dihydrate of carbamazepine, or mixtures thereof, and (iv) water-soluble compounds for inducing osmosis,
b. a wall made of acylated cellulose which is impermeable to the components of the core, but permeable to water, and
c. a passageway through the wall for releasing the components present in the core to the surrounding environment.
78 Citations
11 Claims
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1. An oral osmotic controlled drug delivery system for a sparingly soluble drug comprising:
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a. a wall made of acylated cellulose, b. a core surrounded by the wall, the core comprising (i) finely particulate anhydrous carbamazepine, (ii) a mixture of xanthan gum and croscarmellose sodium as a polymeric swelling agent which exhibits controlled swelling and the wall does not rupture or burst, (iii) a crystal habit modifier in whose presence, upon contact with an aqueous medium, the anhydrous carbamazepine is transformed into cuboidal or rod-shaped crystals of the dihydrate of carbarnazepine, or mixtures thereof, and (iv) a water-soluble compound for inducing osmosis, the wall being impermeable to the components of the drug-containing core, but permeable to water, and c. a passageway through the wall for releasing the components present in the core to the surrounding environment. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification