Multiple wavelength laser workstation

• US 7,427,289 B2
• Filed: 01/14/2005
• Issued: 09/23/2008
• Est. Priority Date: 01/14/2005
• Status: Active Grant

• Current Assignee: Cynosure, LLC (Hologic Incorporated)
• Original Assignee: Cynosure Incorporated
• Inventors: Sierra, Rafael Armando, Boll, James Henry, Sherr, Evan Andrew, Day, Joseph M., Koschmann, Eric Calvin
• Primary Examiner(s): Johnson, III; Henry M
• Application Number:
  US11/035,680
• Publication Number:
  US 20060161142A1
• Time in Patent Office: 1,348 Days
• Field of Search: 128/898, 606/9, 607/89
• US Class Current: 607/89
• CPC Class Codes: A61B 18/203 applying laser energy to the outside of the body
• CPC Class Codes: A61B 2018/00452 Skin
• CPC Class Codes: A61B 2018/207 mixing two wavelengths
• CPC Class Codes: A61N 5/0616 Skin treatment other than tanning
• CPC Class Codes: H01S 3/061 with elliptical or circular cross-section and elongated shape, e.g. rod
• CPC Class Codes: H01S 3/08086 Multiple-wavelength emission
• CPC Class Codes: H01S 3/082 defining a plurality of resonators, e.g. for mode selection or suppression
• CPC Class Codes: H01S 3/092 of flash lamp H01S3/0937 takes precedence ; flash lamps per se H01J61/80; circuit arrangements for operating flash lamps in general H05B41/30
• CPC Class Codes: H01S 3/1611 neodymium
• CPC Class Codes: H01S 3/1643 YAG
• CPC Class Codes: H01S 3/2383 Parallel arrangements

Abstract

Lasers capable of lasing at at least two wavelengths are provided having a lasing medium which is capable of lasing at a first wavelength and at a second wavelength. Also disclosed are laser workstations having two lasers driven by a single electronics drive system in which a single energy storage network is connected to a first laser pump chamber operative to excite a first laser medium and connected to a second laser pump chamber operative to excite a second laser medium.

Claims

1. A laser workstation comprising a first laser and a second laser, each laser having a laser medium and a laser pump chamber with an ionizable flashlamp for exciting the laser medium, an electronics drive system comprising:

a controller adapted to enable selective activation of the first laser and second laser, said controller configured to selectively ionize each ionizable flashlamp, and

an energy storage network which, subsequent to the selective ionization, provides energy simultaneously to each ionizable lamp, whereupon a selectively ionized lamp excites its associated laser medium to produce laser radiation.

2. The laser workstation of claim 1, further comprising a switch located between the energy storage network and the first laser pump chamber and the second laser pump chamber.

3. The laser workstation of claim 1, wherein each laser pump chamber is connected to the energy storage network by a high voltage trigger transformer which is operative to ionize its associated ionizable lamp.

4. The laser workstation of claim 1, wherein the first laser is a pulse dye laser.

5. The laser workstation of claim 4, wherein the pulse dye laser has an output of between about 575 nm and about 650 nm.

6. The laser workstation of claim 1, wherein the second laser is an Nd:

YAG laser.

7. The laser workstation of claim 6, wherein the Nd:

YAG laser comprises;

an Nd;

YAG lasing medium having a longitudinal axis;

an output coupler located at a first end of the Nd;

YAG lasing medium along the longitudinal axis of the Nd;

YAG lasing medium;

a first mirror located at a second end of the Nd;

YAG lasing medium along the longitudinal axis of the Nd;

YAG lasing medium, the first mirror being highly reflective at 1064 nm;

a second mirror located between the first mirror and the second end of the Nd;

YAG lasing medium along the longitudinal axis of the Nd;

YAG lasing medium, the second mirror being highly reflective at 1320 nm and transparent at 1064 nm; and

a beam block shutter movable from a first position along a longitudinal axis of the Nd;

YAG lasing medium between the first and second mirrors along the longitudinal axis of the Nd;

YAG lasing medium to a second position away from the longitudinal axis of the Nd;

YAG lasing medium.

8. The laser workstation of claim 7, wherein the Nd:

YAG lasing medium is a crystal rod.

9. The laser workstation of claim 7, wherein the second mirror is coated with a coating that is antireflective at 1064 nm.

10. The laser workstation of claim 1, further comprising a handpiece operatively connected to the first laser and second laser.

11. The laser workstation of claim 10, wherein the handpiece comprises a plurality of lenses operative to focus the laser radiation.

12. The laser workstation of claim 10, wherein the handpiece is connected to the first laser and second laser by an optical fiber.

13. The laser workstation of claim 9, wherein the handpiece is connected to the first laser and second laser by a wave guide.

14. The laser workstation of claim 1, wherein the energy storage network is operably connected to the first laser pump chamber by an active semiconductor switch and to the second laser pump chamber by an active semiconductor switch.

15. The laser workstation of claim 14, wherein the active semiconductor switches each are selected from the group consisting of an insulated gate bipolar transistor and a field effect transistor.

16. The laser workstation of claim 14, wherein the active semiconductor switch is an IGBT.

17. The laser workstation of claim 14, wherein the first laser device comprises a pulse dye laser.

18. The laser workstation of claim 14, wherein the first laser device comprises an Alexandrite laser.

19. The laser workstation of claim 18, wherein the Alexandrite laser is a variable pulse 755 nm Alexandrite laser.

20. The laser workstation of claim 14, wherein the second laser device comprises:

a second lasing medium capable of lasing at a first wavelength and a second wavelength, the lasing medium having a longitudinal axis;

an output coupler located at a first end of the lasing medium along the longitudinal axis of the lasing medium;

a first mirror located at a second end of the lasing medium along the longitudinal axis of the lasing medium, the first mirror being highly reflective at the first wavelength;

a second mirror located between the first mirror and the second end of the lasing medium along the longitudinal axis of the lasing medium, the second mirror being highly reflective at the second wavelength and transparent at the first wavelength; and

a beam block shutter movable from a first position along the longitudinal axis of the lasing medium between the first and second mirrors along the longitudinal axis of the lasing medium to a second position away from the longitudinal axis of the lasing medium.

21. The laser workstation of claim 20, wherein the second laser device comprises an Nd:

YAG laser.

22. The laser workstation of claim 21, wherein the first mirror is highly reflective at 1064 nm and the second mirror is highly reflective at 1320 nm and transparent at 1064 nm.

23. A method of treating a skin tissue comprising the steps of:

providing a laser device comprising a laser workstation comprising a first laser and a second laser, wherein the first laser and the second laser are driven by a single electronics drive system, said drive system comprising a single energy storage network connected to a first laser pump chamber with a first ionizable flashlamp and connected to a second laser pump chamber with a second ionizable flashlamp, wherein the first laser pump chamber is operative to excite a first laser medium to generate laser energy and the second laser pump chamber is operative to excite a second laser medium to generate laser energy;

treating an area of skin tissue by using the laser device to apply laser energy from the first laser at a first wavelength to the area of skin tissue and using the laser device to apply laser energy from the second laser at a second wavelength to the area of skin tissue, wherein the laser energy from the first laser is applied sequentially or simultaneously with energy from the second laser and wherein the laser energy from at least one of the lasers is applied in sub-pulses,

wherein using the laser device to apply laser energy from the first laser comprises;

selectively ionizing said first flashlamp; and

subsequently providing energy from said drive system simultaneously to each ionizable flashlamp whereupon the selectively ionized flashlamp excites its associated laser medium to generate laser energy, and

wherein using the laser device to apply laser energy from the second laser comprises;

selectively ionizing said second flashlamp; and

subsequently providing energy from said drive system simultaneously to each ionizable flashlamp whereupon the selectively ionized flashlamp excites its associated laser medium to generate laser energy.

24. The method of claim 23, wherein the laser energy from the first laser is at a different wavelength from the laser energy from the second laser.

25. The method of claim 24, wherein the first laser comprises a pulse dye laser and the second laser comprises:

an Nd;

YAG laser having a longitudinal axis;

an output coupler located at a first end of the Nd;

YAG laser along the longitudinal axis of the Nd;

YAG laser;

a first mirror located at a second end of the Nd;

YAG laser along the longitudinal axis of the Nd;

YAG laser, the first mirror being highly reflective at the 1064 nm;

a second mirror located between the first mirror and the second end of the Nd;

YAG laser along the longitudinal axis of the Nd;

YAG laser, the second mirror being highly reflective at 1320 nm and transparent at 1064 nm; and

a beam block shutter movable from a first position along a longitudinal axis of the Nd;

YAG laser between the first and second mirrors along the longitudinal axis of the Nd;

YAG laser to a second position away from the longitudinal axis of the Nd;

YAG laser.

26. The method of claim 25, wherein the first wavelength is 595 nm and the second wavelength is 1064 nm.

27. The method of claim 25, wherein the skin tissue is leg or facial veins.

28. The method of claim 25, wherein the first wavelength is 595 nm and the second wavelength is 1320 nm.

29. The method of claim 28, wherein the skin tissue is acne, acne scarring, scarring, sun-damaged skin, or wrinkled skin.

30. The method of claim 23, wherein sub-pulses from the first laser are intercalated with sub-pulses from the second laser.

31. The method of claim 23, where a pulse train of sub-pulses from the first laser are followed by a sub-pulse from the second laser.

32. A method of treating a skin tissue comprising the steps of:

providing a laser device comprising a laser workstation comprising a first laser and a second laser, each laser having a laser medium and a laser pump chamber with an ionizable flashlamp for exciting the laser medium, an electronics drive system which selectively ionizes the flashlamps, and an energy storage network which, subsequent to the selective ionization, provides energy simultaneously to each ionizable lamp, whereupon a selectively ionized lamp excites its associated laser medium and treating the skin tissue by using the laser device to apply laser energy from the first laser to the skin tissue and using the laser device to apply laser energy from the second laser to the same skin tissue,

wherein using the laser device to apply laser energy from the first laser comprises;

selectively ionizing said first flashlamp; and

subsequently providing energy from said drive system simultaneously to each ionizable flashlamp whereupon the selectively ionized flashlamp excites its associated laser medium to generate laser energy, and

wherein using the laser device to apply laser energy from the second laser comprises;

selectively ionizing said second flashlamp; and

subsequently providing energy from said drive system simultaneously to each ionizable flashlamp whereupon the selectively ionized flashlamp excites its associated laser medium to generate laser energy.

33. The method of claim 32, wherein the first laser is a pulse dye laser and the second laser is a solid-state laser.

34. The method of claim 33, wherein the second laser is an Nd:

YAG laser.

35. A method of treating a vascular lesion comprising the steps of:

providing a laser device comprising a laser workstation comprising a first laser and a second laser, wherein the first laser and the second laser are driven by a single electronics drive system comprising a single energy storage network connected to a first laser pump chamber and connected to a second laser pump chamber, wherein the first laser pump chamber is operative to excite a first laser medium and the second laser pump chamber is operative to excite a second laser medium; and

treating a vascular lesion by using the laser device to apply laser energy at 595 nm from the first laser to the vascular lesion at an effective fluence to convert oxy-hemoglobin to met-hemoglobin, and then using the laser device to apply laser energy at 1064 nm from the second laser to the vascular lesion.

36. The method of claim 35, wherein the laser energy from at least one of the lasers is applied in sub-pulses.

37. The method of claim 36, wherein sub-pulses from the first laser are intercalated with sub-pulses from second laser.

38. The method of claim 36, where a pulse train of sub-pulses from the first laser are followed by a pulse train of sub-pulses from the second laser.