Inorganic-polymer complexes for the controlled release of compounds including medicinals
First Claim
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1. A method of producing sustained release of an active agent in a mammal comprising administering to said mammal a solid composition comprising an active agent which is dispersed throughout a solid matrix reaction product of an aqueous mixture comprised of:
- a) active agent, b) calcium sulfate hemihydrate c) a matrix polymer, and/or d) a complexing agent, and wherein said composition is in the form of a bead, wafer, tablet, sphere, granule or cylinder.
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Abstract
This invention relates generally to the production and use of inorganic-polymer complexes for the controlled release of compounds including medicinals. Advantageously, the inorganic used is calcium sulfate.
156 Citations
39 Claims
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1. A method of producing sustained release of an active agent in a mammal comprising administering to said mammal a solid composition comprising an active agent which is dispersed throughout a solid matrix reaction product of an aqueous mixture comprised of:
- a) active agent, b) calcium sulfate hemihydrate c) a matrix polymer, and/or d) a complexing agent, and wherein said composition is in the form of a bead, wafer, tablet, sphere, granule or cylinder.
- 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, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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36. A method of producing a delivery system comprising:
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(i) mixing (a) calcium sulfate hemihydrate, (b) an active agent and (c) a matrix biopolymer, (ii) forming the mixture of step (i) into a bead, wafer, tablet, sphere, granule or cylinder. - View Dependent Claims (37)
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38. A method of producing a solid composition for the controlled release of an active agent comprising the steps of:
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(a) forming a particulate mixture comprising (i) calcium sulfate hemihydrate, and (ii) a solid active agent; and
thereafter(b) adding to the particulate mixture of step (a) an aqueous solution of a matrix polymer in an amount sufficient to hydrate the calcium sulfate hemihydrate to form a solid matrix containing the active agent, and to slow the release of said active agent therefrom, and (c) forming the mixture of step (b) into a bead, wafer, tablet, sphere, granule or cylinder.
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39. A method of producing a solid composition for controlled release of an active agent comprising the steps of:
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(i) forming a mixture of (a) calcium sulfate hemihydrate, (b) an active agent (c) a matrix polymer in an amount sufficient to slow the release of said active agent, and (d) water in an amount sufficient to form a solid matrix due to the hydration of said calcium sulfate hemihydrate; and
(ii) prior to formation of the mixture of step (i) into a solid matrix, shaping the mixture of step (i) into a bead, wafer, tablet, sphere, granule or cylinder.
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Specification