Method and apparatus for dermatology treatment

• US 5,658,323 A
• Filed: 10/23/1995
• Issued: 08/19/1997
• Est. Priority Date: 07/12/1995
• Status: Expired due to Term

• Current Assignee: Medical Laser Solutions, LLC
• Original Assignee: Luxar Corp. (Boston Scientific Corporation)
• Inventors: Miller, Iain D.
• Primary Examiner(s): Sykes, Angela D.
• Application Number:
  US08/546,791
• Time in Patent Office: 666 Days
• Field of Search: 607/89-91, 606/2, 606/3, 606/9, 606/10, 606/11
• US Class Current: 607/89
• CPC Class Codes: A61B 18/203 applying laser energy to the outside of the body
• CPC Class Codes: A61B 2017/00747 Dermatology
• CPC Class Codes: A61B 2017/00756 Port wine stains
• CPC Class Codes: A61B 2018/00452 Skin
• CPC Class Codes: A61B 2018/00458 Deeper parts of the skin, e.g. treatment of vascular disorders or port wine stains
• CPC Class Codes: A61B 2018/2025 with a pilot laser
• CPC Class Codes: A61N 5/0616 Skin treatment other than tanning
• CPC Class Codes: A61N 5/067 using laser light

Abstract

A laser treatment method is provided which removes vascular and pigmented lesions from the skin of a living human. The methodology involves a carefully designed treatment protocol utilizing a modified optical apparatus. The apparatus is a modified diode laser system, designed for optimal therapeutic selectivity.

Claims

1. A laser treatment method for the removal of unwanted leg veins and other vascular and pigmented lesions from the skin of a human, said method comprising the steps of

irradiating on a first occasion a chosen treatment site with pulsed coherent light with wavelength in the range 700-1000 nm, said irradiating light having an exposure spot size from 0.5 to 1.0 mm at the treatment site and having a power level of 20-60 Watts and a pulse duration of 30-99 milliseconds, said pulse duration being selected for partial conduction in the surrounding dermis, said treatment site containing vessels with diameter in the range 0.1-1.0 mm.

allowing the skin to heal typically for a time period of 2-16 weeks, and

irradiating on 0-5 subsequent occasions each vessel so previously treated with pulsed coherent light with a wavelength in the range 700-1000 nm, said light having a power level of 20-60 Watts and a pulse duration of 30-99 milliseconds.

2. The laser treatment method recited in claim 1 wherein the pulsed coherent light has a wavelength in the region of 800-850 nm.

3. The laser treatment method recited in claim 1 wherein said irradiation on first occasion employs a greater total energy application than on subsequent occasions.

4. The laser treatment method recited in claim 1 wherein said irradiation on first occasion employs a lesser total energy application than on subsequent occasions.

5. The laser treatment method recited in claim 1 comprising the further step of injecting a sensitizing dye into a local venous system of a patient prior to each said irradiating step.

6. The laser treatment method of claim 5, wherein the sensitizing dye is indocyanine green.

7. A therapeutic treatment device for removal of unwanted leg veins and other vascular and pigmented lesions from the skin of a human, said device comprising

a laser head containing power source, laser source, controls, and cooling electronics,

an optical fiber connector and light guide optically coupled to the laser head for receiving light produced by the laser head,

a dermatology handpiece and distance gauge for distance control of tissue contact, connected to the optical fiber, and

control circuitry electronically connected to said laser head and controlling the generation of pulsewidths in the range 1-99 milliseconds, for effecting said removal of lesions.

8. The therapeutic treatment device of claim 7 wherein the laser is a semiconductor laser operating with wavelength in the range 800-850 nm.

9. The therapeutic treatment device of claim 7 wherein the laser is a semiconductor laser with modified control circuitry allowing for pulsewidth controllability in the range 1-99 milliseconds.

10. (New) The therapeutic treatment device of claim 7 wherein the laser source is adapted for total power emission in the range 10-60 Watts;

pulsewidth variability in the range 1-99 milliseconds and wavelength variability in the range 700-1000 nm.

11. The therapeutic treatment device of claim 7 wherein the laser source consists of a diode laser pumped material such as dye-impregnated polymer or active ion doped glass or crystal host.