Microstructures for delivering a composition cutaneously to skin
First Claim
1. A method for reducing the barrier properties of skin, the method comprising:
- (a) providing a microstructure having a substrate and comprising a plurality of non-rigid, wedge, arcuate shaped microelements that protrude from said substrate by at least one predetermined protrusion distance, wherein the plurality of microelements are formed on the substrate in an array along a plurality of concentric circles and(b) placing and rubbing the microstructure on skin, in which said rubbing motion occurs in an arcuate direction that is substantially parallel to a surface of said skin, wherein said rubbing motion causes said wedge, arcuate-shaped microelements to penetrate a stratum corneum layer of said skin, and wherein said at least one predetermined protrusion distance is sufficient so that many of said plurality of microelements penetrate a stratum corneum layer of said skin.
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Accused Products
Abstract
An improved method and apparatus is provided as a system to deliver a composition, preferably a medical or pharmaceutical composition or active, through the stratum corneum of skin, without introducing bleeding or damage to tissue, and absent pain or other trauma. The dimensions and shapes of the microelements are controlled so as to control the penetration depth into the skin. The microelements can be “hollow” such that passageways are created therethrough to allow the composition to flow from a chamber, through the microelements, and into the skin. Alternatively, the microelements can be “solid,” and the composition is applied directly to the skin just before or just after the microelements are applied to the skin surface to create the openings in the stratum corneum.
275 Citations
14 Claims
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1. A method for reducing the barrier properties of skin, the method comprising:
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(a) providing a microstructure having a substrate and comprising a plurality of non-rigid, wedge, arcuate shaped microelements that protrude from said substrate by at least one predetermined protrusion distance, wherein the plurality of microelements are formed on the substrate in an array along a plurality of concentric circles and (b) placing and rubbing the microstructure on skin, in which said rubbing motion occurs in an arcuate direction that is substantially parallel to a surface of said skin, wherein said rubbing motion causes said wedge, arcuate-shaped microelements to penetrate a stratum corneum layer of said skin, and wherein said at least one predetermined protrusion distance is sufficient so that many of said plurality of microelements penetrate a stratum corneum layer of said skin. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification