Method of exfoliation of skin using closely-packed microstructures

• US 8,702,726 B2
• Filed: 10/18/2010
• Issued: 04/22/2014
• Est. Priority Date: 10/16/2000
• Status: Expired due to Term

• Current Assignee: Corium, Inc.
• Original Assignee: Corium International, Inc.
• Inventors: Gartstein, Vladimir, Sherman, Faiz Feisal
• Primary Examiner(s): NGUYEN, TUAN VAN
• Application Number:
  US12/906,918
• Publication Number:
  US 20110046638A1
• Time in Patent Office: 1,282 Days
• Field of Search: 606/9, 606/131, 606/132, 606/133, 604 46- 48, 604/289, 604/290, 600/556
• US Class Current: 606/131
• CPC Class Codes: A45D 26/0004 by abrasion
• CPC Class Codes: A61B 17/205 Vaccinating by means of needles or other puncturing devices
• CPC Class Codes: A61B 17/54 Chiropodists' instruments , e.g. pedicure chiropractic devices A61H1/008
• CPC Class Codes: A61B 2017/00761 Removing layer of skin tissue, e.g. wrinkles, scars or cancerous tissue
• CPC Class Codes: A61M 2037/003 having a lumen
• CPC Class Codes: A61M 37/0015 by using microneedles

Abstract

An improved method and apparatus is provided as a system to enhance skin appearance and health, in which skin is cleaned (or exfoliated) and conditioned by use of microelements affixed to a base element or hand-held patch. The dimensions of the microelements are controlled so as to remove a certain number of layers of skin cells and to accumulate those skin cells, along with other foreign substances, into areas between the microelements. In addition, a conditioning compound or therapeutic active can be applied to the exfoliated skin to enhance the skin. Moreover, the amount of accumulated skin cells represents a self-limiting maximum quantity that cannot be substantially exceeded regardless of the number of attempts by a user to re-use the microstructure apparatus. Some of the microstructures are designed with very close-packed microelements, which in some cases have flexible substrates.

Claims

1. A microstructure apparatus, comprising:

a substrate; and

a plurality of microelements affixed upon a first surface of said substrate;

said plurality of microelements being of predetermined sizes and shapes for use in scraping skin cells from skin when said microstructure apparatus is placed upon said skin and moved in at least one direction;

said predetermined sizes and shapes including at least one substantially sharp edge at a distal end of the microelements, said predetermined sizes and shapes having a characteristic such that the microelements do not create substantial focal discrete points of pressure on said skin;

said plurality of microelements having an inverted wedge shape each having at least one side wall, the plurality of microelements form open areas between at least some of the side walls of adjacent microelements, the open areas being configured for accumulating skin cells.

2. The microstructure apparatus as recited in claim 1, wherein a shape of said plurality of microelements comprises an inverted pyramid.

3. The microstructure apparatus as recited in claim 1, wherein said microelements have a length and shape that tend to scrape skin cells loose without penetrating entirely through a stratum corneum layer of skin.

4. The microstructure apparatus as recited in claim 1, wherein said microstructure is substantially flexible and able to fit a curved area of skin.

5. The microstructure apparatus as recited in claim 1, wherein said microstructure is coated so as to alter a friction characteristic of said microelements.

6. The microstructure apparatus as recited in claim 1, wherein said microstructure is coated so as to act as a feedback indicator during use.

7. The microstructure apparatus as recited in claim 1, wherein said plurality of microelements has three side walls which form a three-sided inverted pyramid, such that the lowermost portions of the three side walls are spaced-apart from one another at a minimum distance, and the uppermost portions of the three side walls are spaced-apart from one another at a lesser distance, and further comprising an upper surface at said distal end that contacts the uppermost portions of the three side walls at said at least one substantially sharp edge.

8. The microstructure apparatus as recited in claim 1, wherein said plurality of microstructures are substantially flexible.

9. The microstructure apparatus as recited in claim 1, wherein at least one side wall is curved.