Optics for medical laser

• US 5,289,557 A
• Filed: 02/23/1993
• Issued: 02/22/1994
• Est. Priority Date: 01/18/1991
• Status: Expired due to Fees

• Current Assignee: Hoya Photonics, Inc. (Hoya Corporation)
• Original Assignee: Premier Laser Systems, Inc.
• Inventors: Sheinis, Andrew I., Colles, M. John, Cozean, Colette, Forkner, John F.
• Primary Examiner(s): FONT, FRANK G
• Application Number:
  US08/021,354
• Time in Patent Office: 364 Days
• Field of Search: 385/116, 385/117, 385/118, 385/119, 385/92, 385/93
• US Class Current: 292/336.3
• CPC Class Codes: A61B 18/201 with beam delivery through a hollow tube, e.g. forming an articulated arm through a flexible conduit A61B18/22; Hand-pieces therefor
• CPC Class Codes: A61B 34/72 Micromanipulators
• CPC Class Codes: Y10T 292/57 Operators with knobs or handles

Abstract

A visible helium neon beam is used as an aiming beam to establish a spot at which a carbon dioxide beam also focuses. The carbon dioxide beam is then employed to vaporize biotic material. A distal end of an articulated arm may couple with the micromanipulator to direct the carbon dioxide beam from the laser through a waveguide and into the micromanipulator. Another aspect of the invention includes introducing the aiming beam into the waveguide through a dichroic mirror positioned in a knuckle joint of the articulated arm. In one embodiment, a laser diode generates the visible light of the aiming beam, and is disposed proximate to the distal end of the articulated arm.

Claims

1. An apparatus for delivery of laser energy for a laser surgery system, comprising:

an articulated arm comprising a wavelength for propagating laser light and at least one knuckle joint, said knuckle joint having a dichroic mirror to change the direction of said propagating laser light by reflecting substantially all of said laser light, said knuckle joint disposed proximate to a distal end of said articulated arm; and

a visible light source to provide an aiming beam, said visible light source positioned to introduce said visible light into said waveguide through said dichroic mirror at said knuckle joint.

2. The apparatus of claim 1, wherein said visible light source is a laser diode.

3. The apparatus of claim 2, wherein said aiming beam has a wavelength of about 670 nanometers.

4. The apparatus of claim 2, wherein said laser diode is positioned such that said visible light propagates substantially parallel to said waveguide prior to said visible light being introduced into said waveguide.

5. The apparatus of claim 1, wherein said visible light source is a helium neon laser.

6. The apparatus of claim 1, wherein said laser light is produced by a carbon dioxide laser.

7. The apparatus of claim 1, additionally comprising a mirror to reflect said visible light onto said dichroic mirror.

8. The apparatus of claim 1, wherein said visible light is introduced into said waveguide such that an axis of propagation of said aiming beam is aligned with an axis of propagation of said laser light.

9. The apparatus of claim 1, additionally comprising a collimating lens.

10. The apparatus of claim 1, additionally comprising a focusing lens.

11. An apparatus for delivery of laser energy for a laser surgery system, comprising:

a laser source for emitting invisible light having a first wavelength;

a waveguide linkage for directing said invisible light along an axis of propagation, said linkage formed by a plurality of coupled waveguide segments;

a laser diode for emitting visible light having a second wavelength; and

a dichroic mirror in said waveguide linkage for reflecting light of one of said wavelengths while transmitting light of another of said wavelengths, said diode disposed proximate to a distal end of said waveguide linkage and positioned such that said visible light is received by said dichroic mirror to combine the visible and invisible light for propagation along said axis of propagation.

12. The apparatus of claim 11, additionally comprising at least one knuckle joint, wherein said dichroic mirror is disposed at said knuckle joint.

13. The apparatus of the claim 11, additionally comprising plural lenses mounted to receive light from said waveguide linkage, one of said lenses consisting of potassium chloride and another of said lenses consisting of zinc selenide.