Dispensing device powered by hydrogel
First Claim
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1. A dispensing device for releasing a drug to an external environment which comprises:
- a capsule containing a plurality of dispensing devices, each dispensing device comprising(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 porous coating which surrounds the mixture, said mixture in communication through said pores with the external environment, and said pores having a pore size sufficient to allow passage of the drugs through to the external environmentwherein 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.
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10 Claims
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1. A dispensing device for releasing a drug to an external environment which comprises:
- a capsule containing a plurality of dispensing devices, each dispensing device comprising
(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 porous coating which surrounds the mixture, said mixture in communication through said pores with the external environment, and said pores having a pore size sufficient to allow passage of the drugs through to the external environment 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)
- a capsule containing a plurality of dispensing devices, each dispensing device comprising
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