Drug delivery system and method of making the same
First Claim
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1. A method of preparing a composition for delivering a an effective amount of a constant dose of an active ingredient to an animal over a preselected, prolonged period of time, comprising the steps of:
- (a) encapsulating effective amounts of said ingredient in first and second separate biodegradable and biocompatible copolymer excipients having different monomers ratios to form first and second microcapsules, each of said microcapsules having of a different rate of release therefrom of said ingredient; and
(b) combining an effective amount of said first and second microcapsules to form said composition having a delivery profile wherein the release of said ingredient through said second microcapsule begins as the release of said ingredient through said first microcapsule declines.
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Abstract
A compatible, biodegradable microcapsule delivery system for active ingredients, including hormonally active peptides, proteins, or other bioactive molecules, and a method of making the same. The ingredients are encapsulated in biodegradable copolymer excipients of varying mole ratios and the blend of the microcapsules are administered to an animal. Delivery of the ingredient occurs over a prolonged period of time at a constant rate as a result of the varying break-down rates of the copolymer excipients.
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Citations
32 Claims
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1. A method of preparing a composition for delivering a an effective amount of a constant dose of an active ingredient to an animal over a preselected, prolonged period of time, comprising the steps of:
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(a) encapsulating effective amounts of said ingredient in first and second separate biodegradable and biocompatible copolymer excipients having different monomers ratios to form first and second microcapsules, each of said microcapsules having of a different rate of release therefrom of said ingredient; and (b) combining an effective amount of said first and second microcapsules to form said composition having a delivery profile wherein the release of said ingredient through said second microcapsule begins as the release of said ingredient through said first microcapsule declines. - View Dependent Claims (2, 3, 4, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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5. The method as claimed in claim 5, wherein the copolymer excipients have mole ratios of lactide to glycolide of 40:
- 60 to 85;
15, respectively.
- 60 to 85;
- 19. A composition capable of delivering an effective amount of a constant dose of an active ingredient to an animal over a preselected, prolonged period of time, comprising a blend of effective amounts of an active ingredient encapsulated in at least two biodegradable and biocompatible copolymer excipients having different monomers ratios to form first and second microcapsules, each excipient having of a different rate of release of said ingredient therethrough, said composition having a delivery profile wherein the release of said ingredient through said second microcapsule begins as the release of said ingredient through said first microcapsule declines.
Specification