Method and apparatus for laser-assisted hair transplantation

• US 5,908,417 A
• Filed: 03/19/1997
• Issued: 06/01/1999
• Est. Priority Date: 03/29/1996
• Status: Expired due to Fees

• Current Assignee: Fotona d.d. (Fotona Holdings LLC)
• Original Assignee: Fotona d.d. (Fotona Holdings LLC)
• Inventors: Nemes, Karolj, Miller, Iain D.
• Primary Examiner(s): Bahr, Jennifer
• Assistant Examiner(s): HARRIS, SONYA C
• Application Number:
  US08/820,761
• Time in Patent Office: 804 Days
• Field of Search: 606/9, 606/10, 606/11, 606/12, 606/14, 606/15, 606/16, 606/17
• US Class Current: 606/9
• CPC Class Codes: A61B 18/203 applying laser energy to the outside of the body
• CPC Class Codes: A61B 2017/00969 used for transplantation
• CPC Class Codes: A61B 2018/00452 Skin
• CPC Class Codes: A61B 2018/00476 Hair follicles
• CPC Class Codes: A61B 2018/2025 with a pilot laser

Abstract

A laser treatment method and apparatus is provided which facilitates the grafting of hairs on the skin of a living human. The methodology involves a carefully designed treatment protocol utilizing a modified optical apparatus. The apparatus is a modified erbium-based laser system, designed for optimal therapeutic selectivity.

Claims

1. A laser treatment method for the preparation of plural recipient sites for implanting hair-bearing tissue on skin of a human, said method comprising the successive steps of

irradiating a selected treatment site of alopecic scalp tissue with erbium pulsed coherent light having a wavelength substantially in the range of 2.5-3.5 μ

m, said light having an energy fluence substantially in a range of 1-200 J/cm², a pulsewidth substantially in a range of 100-2000 microseconds, at a non-orthogonal angle incident to said treatment site and a spot area incident on said treatment site substantially in a range of 10^-3 to 10^-1 cm²,

controlling exposure duration at said treatment site to produce a controlled ablation depth of 1-5 mm at said treatment site,

directing said light, with a distance gauge for non-orthogonal administration of energy, to produce a plurality of recipient sites in said alopecic scalp tissue, whereby slit-shaped recipient sites are produced which are suitable for receiving transplanted grafts, wherein each of said slit-shaped sites is angled in a direction corresponding to a local prevalent direction of hair growth, and

further directing said light to produce said recipient sites in an irregular grid pattern wherein said slits have adjacent positions which are linearly offset.

2. The method according to claim 1, further comprising the step of irrigating said treatment site with a cooling fluid concurrently with said irradiating step.

3. The method according to claim 2, further comprising the step of introducing a flow of inert gas directed at a handpiece connected to a source of said light to reduce collection of debris on said source.

4. The method according to claim 1, further comprising the step of irrigating said treatment site with a water spray to enhance ablation precision, concurrently with said irradiating step.

5. A laser treatment method for ablation of human skin, said method comprising the successive steps of

irradiating a selected treatment site of alopecic scalp tissue with erbium pulsed coherent light having a wavelength substantially in the range of 2.5-3.5 μ

m, said light having an energy fluence substantially in a range of 1-200 J/cm², a pulsewidth substantially in a range of 100-2000 microseconds, with a distance gauge for administration of energy at a non-orthogonal angle incident to said treatment site and a spot area incident on said treatment site substantially in a range of 10^-3 to 10^-1 cm², and

irrigating said treatment site with a cooling fluid concurrently with said irradiating step.

6. The method according to claim 5, further comprising the step of introducing a flow of inert gas directed at a handpiece connected to a source of said light to reduce collection of debris on said source.

7. The method according to claim 5, wherein said cooling fluid is a spray.

8. The method according to claim 7, wherein said cooling fluid is water.

9. A therapeutic treatment device for ablation of skin tissue comprising

a laser head having a controllable laser and a cooling unit for providing a cooling fluid at a dermal treatment site of irradiation by said laser

an articulated delivery system connected to said laser head terminated in a handpiece containing a focusing optics element and a distance gauge, wherein said distance gauge includes a positioning element for aligning said handpiece for non-orthogonal administration of energy to said dermal treatment site.

10. The therapeutic treatment device according to claim 9 further comprising an attachment to provide a cooling fluid to said dermal treatment site.

11. The therapeutic treatment device according to claim 9 wherein said handpiece contains a variable focusing element for forming any one of a circular, elliptical and rectangular spot shape at said dermal treatment site.

12. The therapeutic treatment device according to claim 9 wherein said handpiece further incorporates a means for introducing a flow of inert gas directed at said variable focusing optics element to reduce collection of debris on said focusing optics element.

13. The therapeutic treatment device according to claim 9, wherein said cooling fluid is water.

14. The method according to claim 13, wherein said fluid is a spray.