Tissue treatment method

• US 6,629,974 B2
• Filed: 02/13/2002
• Issued: 10/07/2003
• Est. Priority Date: 02/22/2000
• Status: Expired due to Term

• Current Assignee: Energist Limited
• Original Assignee: Gyrus Medical Limited (Olympus Corporation)
• Inventors: Amoah, Francis, Goble, Nigel M., Penny, Keith
• Primary Examiner(s): Gibson, Roy D.
• Assistant Examiner(s): Vrettakos, Peter J
• Application Number:
  US10/073,179
• Publication Number:
  US 20020161362A1
• Time in Patent Office: 601 Days
• Field of Search: 606/41, 606/42, 606/45-52, 128/898, 607/96, 607/98-102, 607/104
• US Class Current: 606/41
• CPC Class Codes: A61B 18/042 using additional gas becoming plasma
• CPC Class Codes: A61B 2017/00761 Removing layer of skin tissue, e.g. wrinkles, scars or cancerous tissue
• CPC Class Codes: H05H 1/24 Generating plasma nuclear fusion reactors G21B1/00; gas-filled discharge reactors H01J37/32
• CPC Class Codes: H05H 1/46 using applied electromagnetic fields, e.g. high frequency or microwave energy H05H1/26 takes precedence
• CPC Class Codes: H05H 1/466 using capacitive coupling means, e.g. electrodes
• CPC Class Codes: H05H 2242/24 Radiofrequency or microwave generators
• CPC Class Codes: H05H 2245/34 Skin treatments, e.g. disinfection or wound treatment

Abstract

A method for skin treatment comprises the steps of delivering at least one pulse of radio frequency power to at least one electrode in order to create an electric field; passing gas through the electric field in order to form plasma from the gas; and applying the plasma to the surface of skin. The amount of radio frequency power may be relatively low such that the application of plasma causes denaturation of collagen within the collagen-containing tissue beneath the skin surface, which may promote the generation of new collagen within the collagen-containing tissue.

Claims

1. A method of skin treatment, comprising the steps of:

providing a gas conduit including at least two electrodes;

delivering at least one pulse of radio frequency power to at least one of said electrodes in order to create an electric field between at least two said electrodes;

passing gas through said electric field in order to form plasma from said gas; and

emitting said plasma from the gas conduit such that it is applied to a surface of skin, wherein the application of plasma to the surface of skin causes denaturation of collagen within collagen-containing tissue beneath the skin surface without causing the complete removal of epidermis at said surface of skin.

2. A method according to claim 1, wherein the generation of new collagen within said collagen-containing tissue is promoted.

3. A method according to claim 1, wherein said at least one pulse of radio frequency power has an energy such as to produce a temperature rise of up to 22.7°

C. under the copper disc test.

4. A method according to claim 3, wherein said at least one pulse of radio frequency power has an energy such as to produce a temperature rise of between 12.8°

C. and 19.4°

C. under the copper disc test.

5. A method according to claim 1, wherein said at least one pulse has a duration in the range of from 2 ms to 100 ms.

6. A method according to claim 5, wherein said at least one pulse has a duration in the range of from 5 ms to 20 ms.

7. A method according to claim 1, wherein said at least one pulse is delivered at a rate of 0.5 Hz to 15 Hz.

8. A method according to claim 1, wherein said at least one pulse is delivered at a rate of 0.5 Hz to 10 Hz.

9. A method according to claim 1, wherein said at least one pulse is delivered at a rate of 1 Hz to 6 Hz.

10. A method according to claim 1, wherein a series of pulses of plasma are applied to a series of regions of the skin surface.

11. A method according to claim 10, wherein said regions of the skin surface overlap.

12. A method according to claim 10, wherein one of said series of plasma pulses is applied to each said region of the skin surface.

13. A method according to claim 10, wherein at least two plasma pulses are applied to each of said regions of the skin surface.

14. A method according to claim 13, wherein said at least two plasma pulses are applied to each region consecutively.

15. A method according to claim 14, wherein one plasma pulse is applied to each of said regions of the skin surface before a second plasma pulse is applied to each of said regions.

16. A method of skin treatment, comprising the steps of:

providing a gas conduit including at least two electrodes;

delivering at least one pulse of radio frequency power to at least one of said electrodes to create an electric field between at least two said electrodes;

passing gas through said electric field in order to form plasma from said gas; and

emitting said plasma from the gas conduit such that it is applied to the surface of skin, such that the application of plasma to the surface of skin causes denaturation of collagen with collagen-containing tissue beneath the skin surface,

wherein said at least one pulse of radio frequency power has an energy such as to produce a temperature rise of up to 22.7°

C. under the copper disc test.

17. A method according to claim 16, wherein the generation of new collagen within said collagen-containing tissue is promoted.

18. A method according to claim 16, wherein said at least one pulse of radio frequency power has an energy such as to produce a temperature rise of between 12.8°

C. and 19.4°

C. under the copper disc test.

19. A method according to claim 16, wherein said at least one pulse has a duration in the range of from 5 ms to 20 ms.

20. A method according to claim 16, wherein a series of pulses of plasma are applied to a series of regions of the skin surface.

21. A method according to claim 20, wherein said regions of the skin surface overlap.

22. A method according to claim 20, wherein one of said series of pulses is applied to each said region of the skin surface.

23. A method according to claim 20, wherein at least two pulses of plasma are applied to each of said regions of the skin surface.

24. A method according to claim 23, wherein said at least two pulses of plasma are applied to each region consecutively.

25. A method according to claim 24, wherein one pulse of plasma is applied to each of said regions of the skin surface before a second pulse of plasma is applied to each of said regions.