Dispensing devices powered by hydrogel
First Claim
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1. A tablet for releasing a drug to an external environment which comprises:
- (a) an innermost hydrogel layer, said innermost hydrogel layer not including drug;
(b) a second layer, said second layer surrounding said innermost layer and said second layer comprising a mixture comprising one or more drugs and from about 50 to about 95 weight percent hydrogel, said hydrogel in said second layer being different from said hydrogel in said first layer; and
(c) a coating which surrounds the mixture and which comprises a polymer and one or more porosigens wherein the rate of drug release is relatively independent of the solubility of the drug.
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Abstract
This invention relates to devices useful for the controlled delivery of one or more beneficial agents to an environment of use. More specifically, this invention concerns such devices which are powered by hydrogel. This invention also relates to the controlled delivery of one or more beneficial agents to an aqueous environment of use through the use of such hydrogel powered dispensing devices. Also disclosed are methods for the controlled delivery of one or more beneficial agents to an aqueous environment of use which comprises administering to or otherwise placing the devices of this invention in the environment of use.
41 Citations
17 Claims
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1. A tablet for releasing a drug to an external environment which comprises:
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(a) an innermost hydrogel layer, said innermost hydrogel layer not including drug; (b) a second layer, said second layer surrounding said innermost layer and said second layer comprising a mixture comprising one or more drugs and from about 50 to about 95 weight percent hydrogel, said hydrogel in said second layer being different from said hydrogel in said first layer; and (c) a coating which surrounds the mixture and which comprises a polymer and one or more porosigens wherein the rate of drug release is relatively independent of the solubility of the drug. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 16, 17)
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12. A tablet for releasing a drug to an external environment which comprises:
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(a) a first layer comprising a mixture of one or more beneficial agents and from about 50 to about 95 weight percent hydrogel; (b) a second layer comprising hydrogel which second layer is adjacent to the first layer and comprises an area in contact with the first layer said second layer not including drug, said hydrogel in said second layer being different from said hydrogel in said first layer; and (c) a coating which comprises a polymer and one or more porosigens and which coating surrounds the first and second layers except for said area in contact wherein the rate of drug release is relatively independent of the solubility of the drug. - View Dependent Claims (13, 14, 15)
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Specification