Method and apparatus for electrically assisted topical delivery of agents for cosmetic applications

• US 6,947,791 B2
• Filed: 09/27/2001
• Issued: 09/20/2005
• Est. Priority Date: 07/13/1998
• Status: Expired due to Fees

• Current Assignee: Genetronics, Inc. (Inovio Pharmaceuticals, Inc.)
• Original Assignee: Genetronics, Inc. (Inovio Pharmaceuticals, Inc.)
• Inventors: Zhang, Lei, Hofmann, Gunter A.
• Primary Examiner(s): Bockelman, Mark
• Application Number:
  US09/966,390
• Publication Number:
  US 20030097118A1
• Time in Patent Office: 1,454 Days
• Field of Search: 604 20- 21, 604/500, 604/501, 604/522
• US Class Current: 604/20
• CPC Class Codes: A61N 1/0424 Shape of the electrode
• CPC Class Codes: A61N 1/0428 Specially adapted for iontophoresis, e.g. AC, DC or including drug reservoirs
• CPC Class Codes: A61N 1/0436 Material of the electrode
• CPC Class Codes: A61N 1/0448 Drug reservoir
• CPC Class Codes: A61N 1/0468 Specially adapted for promoting wound healing
• CPC Class Codes: A61N 1/325 for iontophoresis, i.e. transfer of media in ionic state by an electromotoric force into the body electrodes for external use A61N1/0428
• CPC Class Codes: A61N 1/327 for enhancing the absorption properties of tissue, e.g. by electroporation

Abstract

The present invention is based on the development of a method for cosmetic delivery of L-ascorbic acid-containing compositions to the layer of the skin wherein collagen formation takes place to enhance production of collagen and thereby combat some of the effects of aging and oxy-radical damage on skin. Sufficient electric pulses applied to a region of skin surface temporarily create new pathways through the lipid skin barrier, thereby delivering an L-ascorbic acid-containing composition through the lipid skin barrier and enhancing production of collagen in the region of the skin so treated. A handheld electrical pulser apparatus, optionally table-top adaptable, and methods of use for cosmetic treatment of degenerative skin conditions are provided by the invention.

Claims

1. An apparatus for delivering voltage pulses to tissue so as to establish an electric field sufficient to assist the topical introduction of a therapeutic agent into a cell of a tissue, wherein the apparatus comprises:

a) a detachable electrode support member having disposed thereon one or more opposing pairs of electrodes arranged relative to one another to form an electrode array, and further comprising an electrode cover and a cosmetic reservoir disposed between the electrode cover and electrode array, wherein the cosmetic reservoir is in fluid communication with the electrode array; and

b) a power supply in electrical communication with the pair(s) of electrodes disposed in the support member, wherein the power supply provides voltage pulses to at least a pair of the electrodes to effect electroporation.

2. The apparatus according to claim 1, wherein said apparatus is configured to be hand-held.

3. The apparatus according to claim 1, wherein said reservoir comprises a porous reservoir.

4. The apparatus according to claim 1, wherein said detachable electrode support member is square, round, contoured, or tube shaped.

5. The apparatus according to claim 1, wherein said electrodes are a meander type electrode or a micropatch electrode.

6. The apparatus according to claim 5, wherein said meander type electrode comprise an interweaving array of electrically conductive electrode fingers coated on a thin film.

7. The apparatus according to claim 5, wherein said meander electrode is insulated or porous.

8. The apparatus according to claim 1, wherein said electrodes have a width of about 1 mm.

9. The apparatus according to claim 1, wherein said electrodes are separated by a gap of about 0.2 mm.

10. The apparatus according to claim 1, wherein said pulse generator is powered by a battery.

11. The apparatus according to claim 1, further comprising a vibrating unit.

12. The apparatus according to claim 11, wherein said vibrating unit applies ultra sound.

13. The apparatus according to claim 1, further comprising a phonophoresis unit.

14. The apparatus according to claim 1, further comprising a pressure sensor unit.

15. The apparatus according to claim 1, further comprising a unit to measure and record the skin resistance of the subject.

16. The apparatus according to claim 1, further comprising a means for applying iontophoresis.

17. The apparatus according to claim 16, wherein said means further comprises a switching unit to allow for switching between electroporation and iontophoresis.

18. The apparatus according to claim 1, wherein said pulses are electrical impulses.

19. The apparatus according to claim 18, wherein said pulses are selected from the group consisting of unipolar, bipolar, exponential and square wave forms.

20. The apparatus according to claim 1, wherein said electrodes are selected from the group consisting of wire, porous, and meander electrodes.