Solvent-cast microprotrusion arrays containing active ingredient
First Claim
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1. A microprotrusion array, comprising:
- an approximately planar base and a plurality of microprotrusions, wherein the microprotrusions comprise at least a first and a second layer arranged roughly parallel to the plane of the planar base, the first and second layers formed of different polymers, the first layer is contained in a distal end of the microprotrusions and comprised of (i) a biodegradable polymer, (ii) one or more components to facilitate biodegradation selected from sugars, sugar alcohols, cyclodextrins and water-swellable polymers, and (iii) an active ingredient, wherein a ratio of weight percent of the biodegradable polymer to weight percent of the one or more components to facilitate biodegradation is in the range of about 6.25;
1 to about 1;
3.75.
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Abstract
In an aspect of the invention, an array of microprotrusions is formed by providing a mold with cavities corresponding to the negative of the microprotrusions, casting atop the mold a first solution comprising a biocompatible material and a solvent, removing the solvent, casting a second solution atop the first cast solution, removing the solvent from the second solution, and demolding the resulting array from the mold. The first solution preferably contains an active ingredient.
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Citations
18 Claims
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1. A microprotrusion array, comprising:
an approximately planar base and a plurality of microprotrusions, wherein the microprotrusions comprise at least a first and a second layer arranged roughly parallel to the plane of the planar base, the first and second layers formed of different polymers, the first layer is contained in a distal end of the microprotrusions and comprised of (i) a biodegradable polymer, (ii) one or more components to facilitate biodegradation selected from sugars, sugar alcohols, cyclodextrins and water-swellable polymers, and (iii) an active ingredient, wherein a ratio of weight percent of the biodegradable polymer to weight percent of the one or more components to facilitate biodegradation is in the range of about 6.25;
1 to about 1;
3.75.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
Specification