Medical laser treatment device

• US 5,374,266 A
• Filed: 11/25/1992
• Issued: 12/20/1994
• Est. Priority Date: 11/27/1991
• Status: Expired due to Term

• Current Assignee: Hoya Corporation, Kabushiki Kaisha Morita Seisakusho
• Original Assignee: Hoya Corporation, Kabushiki Kaisha Morita Seisakusho
• Inventors: Endo, Naoshi, Masaki, Odaka, Kataoka, Kenzo, Yuba, Akira, Okagami, Yoshihide, Nakajima, Sadahiro
• Primary Examiner(s): Pellegrino, Stephen C.
• Assistant Examiner(s): PEFFLEY, MICHAEL F
• Application Number:
  US07/982,082
• Time in Patent Office: 755 Days
• Field of Search: 128/395-398, 606/10, 606/13-17, 604/20, 604/21, 385/39, 385/50, 385/55, 385/74, 385/92, 385/94
• US Class Current: 606/15
• CPC Class Codes: A61C 1/0046 Dental lasers surgical lasers A61B18/20; working by laser beam in general B23K26/00; lasers per se H01S3/00
• CPC Class Codes: B23K 26/06 Shaping the laser beam, e.g. by masks or multi-focusing
• CPC Class Codes: B23K 26/064 by means of optical elements, e.g. lenses, mirrors or prisms
• CPC Class Codes: B23K 26/0648 comprising lenses
• CPC Class Codes: B23K 26/0665 by beam condensation on the workpiece, e.g. for focusing
• CPC Class Codes: B23K 26/146 the fluid stream containing a liquid
• CPC Class Codes: B23K 26/1476 Features inside the nozzle for feeding the fluid stream through the nozzle
• CPC Class Codes: B23K 26/703 Cooling arrangements by using a fluid stream B23K26/14
• CPC Class Codes: G02B 6/32 having lens focusing means positioned between opposed fibre ends with lens being an integral part of the single fibre end G02B6/262
• CPC Class Codes: G02B 6/3813 for transmission of high energy beam coupling high energy sources and light guides G02B6/4296
• CPC Class Codes: G02B 6/3814 with cooling or heat dissipation means
• CPC Class Codes: G02B 6/3829 Bent or angled connectors G02B6/3827 takes precedence
• CPC Class Codes: G02B 6/4298 coupling with non-coherent light sources and/or radiation detectors, e.g. lamps, incandescent bulbs, scintillation chambers

Abstract

A medical laser treatment device comprising a laser generation source and a laser handpiece which comprises a light-guiding fiber used to guide a laser beam irradiated from the laser generation source, a probe for guiding the laser beam having been guided by the fiber to an object to be irradiated, at least two independent air supply passages and at least one water supply passage, the laser handpiece being adapted such that the emission end of the light-guiding fiber is airtightly isolated from the incident end of the probe via a light-guiding shield plate to make the internal section of the light-guiding fiber airtight, to cool the emission end of the light-guiding fiber using dry gas supplied from the first air supply passage and to cool the incident end of the probe using gas supplied from the second air supply passage, and being also arranged such that water supplied from the water supply passage is blown out from the peripheral section of the leading end of the probe, thereby preventing the emission end of said light-guiding fiber from absorbing moisture and being heated.

Claims

1. A medical laser treatment device comprising a laser generation source and a laser handpiece which comprises a light-guiding fiber coupled to said laser generation source for guiding a laser beam irradiated from said laser generation source, a probe provided at one end of said laser handpiece with an incident end of said probe adjacent to an emission end of said light-guiding fiber for guiding the laser beam to an object to be irradiated, at least two independent first and second air supply passages and at least one water supply passage provided in said handpiece, a light-guiding shield member airtightly coupled to said laser handpiece such that the emission end of said light-guiding fiber is airtightly isolated from the incident end of the probe, and wherein said first air supply passage extends to said emission end of said light-guiding fiber so that dry gas supplied from said first air supply passage cools the emission end of said light-guiding fiber and said second air supply passage extends to said incident end of said probe so that gas supplied from said second air supply passage cools the incident end of said probe, and said water supply passage extends toward a peripheral section of a leading end of said probe such that water supplied from said water supply passage is blown out from the peripheral section of the leading end of said probe.

2. A medical laser treatment device according to claim 1, further comprising a means for flowing backward the dry gas used to cool the emission end of said light-guiding fiber in the section incorporating said light-guiding fiber and discharging said dry gas at a position fully away from the emission end of said light-guiding fiber.

3. A medical laser treatment device according to claim 1, wherein said light-guiding fiber is a fluoride fiber.

4. A medical laser treatment device according to claim 1 wherein a base section of a probe protection pipe is removably fitted and connected to a front section of said handpiece such that water from said water supply passage passes through a gap between an internal surface of said probe protection pipe and an external surface of said probe to supply water to a leading end of said probe.

5. A medical laser treatment device according to claim 4, wherein said probe is tapered off toward the leading end thereof and the emission end surface thereof intersects an axis of said fiber orthogonally.

6. A medical laser treatment device according to claim 4 wherein said probe protection pipe is metal pipe which is straight.

7. A medical laser treatment device according to claim 4, wherein the leading end of said probe protection pipe has a cut-off surface orthogonal to an axis probe protection pipe.

8. A medical laser treatment device according to claim 4, wherein a pointed tongue having a mirror surface on an internal surface of said pointed tongue protrudes obliquely to an axis of said protection pipe at the leading end of said protection pipe.

9. A medical laser treatment device according to claim 4, wherein the leading end of said probe protection pipe is flat.

10. A medical laser treatment device according to claim 4, wherein said probe is expanded toward the leading end thereof and the emission end surface thereof intersects an axis of said fiber orthogonally.

11. A medical laser treatment device according to claim 4, wherein said probe is expanded toward the leading end thereof and the emission end surface thereof intersects an axis of said fiber obliquely.

12. A medical laser treatment device according to claim 4, wherein said probe is tapered off toward the leading end thereof and the emission end surface thereof intersects an axis of said fiber obliquely.

13. A medical laser treatment device according to claim 4, wherein said probe protection pipe is metal and tapered off toward the leading end thereof.

14. A medical laser treatment device according to claim 4, wherein said probe protection device is a metal pipe which is bent.

15. A medical laser treatment device according to claim 4, wherein said probe protection pipe is a synthetic resin pipe which is straight.

16. A medical laser treatment device according to claim 4, wherein said probe protection pipe is a synthetic resin pipe which is tapered off toward the leading end thereof.

17. A medical laser treatment device according to claim 4, wherein said probe protection pipe is a synthetic resin pipe which is bent.

18. A medical laser treatment device according to claim 1 or claim 4, wherein said laser generation source is a laser generator for generating an Er:

YAG solid laser beam, said light-guiding fiber is a fluoride fiber and said medical laser treatment device is equipped with a laser control means for adjusting the laser output of said laser generator.

19. A medical laser treatment device according to claim 18, wherein the diameter of the leading end of said probe is in the range of 50 to 600 μ

m, and the laser irradiation output obtained at the leading end of said probe can be adjusted in the pulse width range of 150 to 300 μ

s, in the pulse period range of 1 to 30 pps and at the maximum irradiation energy per pulse of 1 J by said laser control means.