Method and apparatus for surgical and dermatological treatment by multi-wavelength laser light

• US 6,110,195 A
• Filed: 06/01/1998
• Issued: 08/29/2000
• Est. Priority Date: 06/01/1998
• Status: Expired due to Fees

• Current Assignee: Altralight, Inc.
• Original Assignee: Altralight, Inc.
• Inventors: Qiu, Honghua, Xie, Ping
• Primary Examiner(s): Dvorak, Linda C. M.
• Assistant Examiner(s): HARRIS, SONYA C
• Application Number:
  US09/088,416
• Time in Patent Office: 820 Days
• Field of Search: 606/1, 606/14, 606/15, 606/16, 606/10, 606/11, 606/12, 607/88, 607/89, 607/90
• US Class Current: 607/89
• CPC Class Codes: A61B 18/203 applying laser energy to the outside of the body
• CPC Class Codes: A61B 2018/00005 Cooling or heating of the probe or tissue immediately surrounding the probe
• 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 2018/00476 Hair follicles
• CPC Class Codes: A61B 2018/2065 Multiwave; Wavelength mixing, e.g. using four or more wavelengths pilot laser A61B2018/2025

Abstract

A method and apparatus for surgical and dermatological treatment using a multi-wavelength laser system includes a primary laser beam generator optically pumped by a semiconductor laser diode. A portion or all of the optical pumping energy may be outputted with the primary laser beam output to form a multi-wavelength treatment beam. A frequency doubling medium, such as a KTP or LBO crystal, may be imposed in the output of the laser beam generator to produce an additional wavelength that may be combined into the multi-wavelength treatment beam. To achieve high peak power pulse laser output, a Q-switch element can be placed in front or in back of the laser crystal. Alternatively, the laser system may output only the wavelength of the semiconductor laser diode pumping system. The selection of one or more wavelengths provides a wider range of treatment modalities using a single laser system, without creating problems attendant with the complexity and maintenance of prior art multi-wavelength laser systems. The laser system may include a plurality of laser diodes, each arranged to generate an output at a respective unique wavelength. The laser diode outputs are combined in a beam mixer and directed through a fiberoptic delivery system to a surgical handpiece or the like. The laser diodes are operated individually to provide a combination of wavelengths of laser light that may be adjusted continuously in CW mode or pulse mode to create varying thermal effects for different treatment modalities.

Claims

1. A laser apparatus, including:

primary laser generator means for generating a first laser output at a first wavelength, said primary laser generator means being optically pumped;

laser diode means for generating a second laser output at a second wavelength, said second wavelength being capable of optically pumping said primary laser generator means;

delivery means for directing the output of said laser apparatus to a target for carrying out useful work;

means for reconfiguring said laser apparatus from a first arrangement in which said delivery means is connected to the output of said primary laser generator means and said laser diode means is connected to optically pump said primary laser generator means, to a second arrangement in which said delivery means is connected to the output of said laser diode means.

2. The laser apparatus of claim 1, wherein said means for reconfiguring said laser apparatus includes a first output connector means for directing the output of said primary laser generator means, said delivery means being releasably securable to said first output connector means.

3. The laser apparatus of claim 2, wherein said means for reconfiguring said laser apparatus includes a second output connector means for directing the output of said laser diode means, said delivery means being releasably securable to said second output connector means.

4. The laser apparatus of claim 3, wherein said means for reconfiguring said laser apparatus includes a third connector means for directing laser energy to said primary laser generator means in optical pumping fashion, and a jumper optical fiber releasably connectable between said second and third connector means for directing the second laser output to said primary laser generator means for optical pumping purposes.

5. The laser apparatus of claim 1, further including a non-linear frequency doubling optical crystal, and means for selectively interposing said optical crystal in a beam path of said primary laser generator means.

6. The laser apparatus of claim 1, wherein said delivery means includes an output device incorporating a computer controlled pattern generator for directing the output of said laser apparatus to trace selected patterns on the target.

7. The laser apparatus of claim 2, wherein said means for reconfiguring said laser apparatus includes mirror means for reflecting the output of said laser diode means to said primary laser generator means in optical pumping fashion.

8. The laser apparatus of claim 7, wherein said mirror means includes a movable mirror that is movable between a first position in which the output of said laser diode means is directed to said primary laser generator means, to a second position in which the output of said laser diode means is directed to said first output connector means.

9. The laser apparatus of claim 1, further including control means for operating said laser diode means in continuous wave fashion.

10. The laser apparatus of claim 1, further including control means for operating said laser diode means in pulsed mode.