Light diffusing tip

• US 7,609,927 B2
• Filed: 07/08/2008
• Issued: 10/27/2009
• Est. Priority Date: 11/16/2004
• Status: Active Grant

• Current Assignee: Visualase, Inc. (Medtronic Plc)
• Original Assignee: Visualase, Inc. (Medtronic Plc)
• Inventors: Gelnett, Marc, Gowda, Ashok, Fox, Matthew, McNichols, Roger
• Primary Examiner(s): Font; Frank G
• Assistant Examiner(s): El Shammaa; Mary A
• Application Number:
  US12/169,602
• Publication Number:
  US 20080267570A1
• Time in Patent Office: 476 Days
• Field of Search: 385/117
• US Class Current: 385/117
• CPC Class Codes: A61N 5/0603 for treatment of body cavities
• CPC Class Codes: A61N 5/062 Photodynamic therapy, i.e. excitation of an agent
• CPC Class Codes: G02B 6/241 Light guide terminations
• CPC Class Codes: G02B 6/262 Optical details of coupling light into, or out of, or between fibre ends, e.g. special fibre end shapes or associated optical elements

Abstract

A light diffusing tip is provided. The light diffusing tip comprises a housing and a monolithic light scattering medium disposed within the housing. The monolithic light scattering medium comprises a first scattering region at a first position, the scattering region having a first scattering property and a second scattering region at a second position, the second scattering region having a second scattering property different from the first scattering property, wherein the first scattering region and the second scattering region are coextensive along a substantial portion of a length of the housing. A light diffusing applicator also is provided. The light diffusing applicator comprises at least one optical waveguide, a first termination coupled to a first end of the at least one optical waveguide, the first termination to couple to a light source and a light diffusing tip coupled to a second end of the at least one optical waveguide.

Claims

1. A light diffusing tip comprising:

a housing; and

a monolithic light scattering medium disposed within the housing and comprising;

at least one scattering region comprising at least one light scattering material suspended in a medium, wherein said at least one light scattering material is spatially distributed in varying concentration along at least one axis of the housing;

wherein said housing comprises at least one redirecting region that redirects the light emitted from said monolithic light scattering medium.

2. The light diffusing tip of claim 1, wherein said light scattering material comprises at least discrete gas bubbles.

3. The light diffusing tip of claim 1, further comprising a first scattering region and a second scattering region, wherein the first scattering region comprises a first concentration of a first scattering material and the second scattering region comprises a second concentration of said first scattering material.

4. The light diffusing tip of claim 2, wherein the first scattering region comprises a first scattering material and the second scattering region comprises a second scattering material.

5. The light diffusing tip of claim 1, wherein said at least one light scattering material is spatially distributed during manufacture by centrifugation.

6. The light diffusing tip of claim 1, wherein said at least one redirecting region comprises a light scattering cap at the distal end of the housing.

7. The light diffusing tip of claim 1, wherein said at least one redirecting region comprises a reflective portion of the surface of the housing.

8. A light diffusing tip comprising:

a housing; and

a monolithic light scattering medium disposed within the housing and comprising;

a first scattering region comprising a first scattering material; and

a second scattering region comprising a second scattering material, said second scattering region contacting at least a portion of the first scattering region over a substantial portion of the length of the housing;

wherein said first and second scattering materials comprise particles suspended in a light transmissive material, the concentration of said particles in at least one of the scattering regions varying along at least one axis of the housing.

9. The light diffusing tip of claim 8, wherein at least a portion of said particles comprise discrete gas bubbles.

10. The light diffusing tip of claim 8, wherein said particles are spatially distributed during manufacture by centrifugation.

11. The light diffusing tip of claim 8, further comprising at least one redirecting region that redirects the light emitted from said monolithic light scattering medium.

12. The light diffusing tip of claim 11, wherein said at least one redirecting region comprises a light scattering cap at the distal end of the housing.

13. The light diffusing tip of claim 11, wherein said at least one redirecting region comprises a reflective material on a surface of the housing.

14. A method of forming an applicator, the method comprising:

inserting a first scattering material into a first end of a housing to form a first scattering region, said first scattering material comprising particles suspended in a medium;

inserting a second scattering material into the housing so as to contact a portion of the first scattering region over a substantial portion of the length of the housing to form a second scattering region, said second scattering material comprising particles suspended in a medium;

mechanically distributing particles of said first and second scattering materials such that the concentration of said particles varies along at least one axis of the housing; and

curing the first scattering material and the second scattering material to form a monolithic scattering medium.

15. The method of claim 14, wherein at least a portion of said particles comprise discrete gas bubbles.

16. The method of claim 14, wherein inserting said second scattering material displaces at least a portion of the first scattering material.

17. The method of claim 14, wherein inserting said second scattering material forms said material into a substantially conical shape.

18. The method of claim 14, wherein said particles are mechanically distributed during curing of said first and second scattering materials.

19. The method of claim 14, wherein said particles are mechanically distributed by centrifugation.

20. The method of claim 14, wherein said first scattering material is partially cured prior to inserting said second scattering material.