Light diffusing tip

• US 7,274,847 B2
• Filed: 11/16/2004
• Issued: 09/25/2007
• Est. Priority Date: 11/16/2004
• Status: Active Grant

• Current Assignee: Visualase, Inc. (Medtronic Plc)
• Original Assignee: BioTex Incorporated
• Inventors: Gelnett, Marc, Gowda, Ashok, Fox, Matthew, McNichols, Roger
• Primary Examiner(s): Font; Frank G.
• Assistant Examiner(s): EL SHAMMAA, MARY A
• Application Number:
  US10/989,894
• Publication Number:
  US 20060104593A1
• Time in Patent Office: 1,043 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;

a first scattering region at a first position, the first 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.

2. The light diffusing tip of claim 1, wherein the first scattering property includes a first concentration of a first type of scattering particle and the second scattering property includes a second concentration of the first type of scattering particle.

3. The light diffusing tip of claim 1, wherein the first scattering property includes a first type of scattering particle and the second scattering property includes a second type of scattering particle.

4. The light diffusing tip of claim 1, wherein a light scattering coefficient of the first scattering region is less than a light scattering coefficient of the second scattering region.

5. The light diffusing tip of claim 4, wherein the first scattering region is at a proximal end of the housing and the second scattering region is at a distal end of the housing and wherein a light scattering coefficient of the light diffusing tip at the substantial portion of the length of the housing increases with a distance from the proximal end of the housing.

6. The light diffusing tip of claim 1, wherein a cross-section of the first scattering region and a cross-section of the second scattering region vary across the substantial portion of the length of the housing.

7. The light diffusing tip of claim 6, wherein the cross-section of the first scattering region increases across the substantial portion of the length of the housing and the cross-section of the second scattering region decreases across the substantial portion of the length of the housing.

8. The light diffusing tip of claim 1, wherein the first scattering region comprises an approximately conical shape across the substantial portion of the length of the housing.

9. The light diffusing tip of claim 8, wherein the approximately conical shape is substantially coaxial with a longitudinal axis of the housing.

10. The light diffusing tip of claim 8, wherein the approximately conical shape is offset from a longitudinal axis of the housing.

11. The light diffusing tip of claim 1, wherein the first scattering region comprises an approximately non-linear profile across the substantial portion of the length of the housing.

12. The light diffusing tip of claim 1, further comprising a cap disposed at an end of the housing.

13. The light diffusing tip of claim 12, wherein the cap comprises at least one of a pointed cap, a rounded cap, a biocompatible cap, or a light-scattering cap.

14. The light diffusing tip of claim 1, further comprising a reflective material disposed at a surface of the housing.

15. The light diffusing tip of claim 1, further comprising a non-stick material disposed at an outer surface of the housing.

16. The light diffusing tip of claim 1, wherein the light scattering medium comprises light scattering particles suspended in a light transmissive material.

17. The light diffusing tip of claim 1, wherein the housing is coextensive with a tip of at least one optical waveguide.

18. The light diffusing tip of claim 17, wherein the housing is approximately tubular and having an outer diameter substantially equivalent to an outer diameter of an outer jacketing that sheaths the at least one optical waveguide.

19. The light diffusing tip of claim 8, wherein the approximately conical shape has a larger cross-section near the distal end of the housing and decreases in cross-section with axial distance from the distal end of the housing.

20. A light diffusing tip comprising:

a housing;

a first scattering region disposed within the housing at a first position and having a substantially conical portion extending along a portion of a length of the housing, the first scattering region having a first scattering coefficient; and

a second scattering region disposed within the housing at a second position and having at least a portion coextensive with the substantially conical portion of the first scattering region, the second scattering region having a second scattering coefficient different from the first scattering coefficient, wherein the first and second scattering regions are cured to form a monolithic structure.

21. The light diffusing tip of claim 20, wherein the first scattering coefficient is less than the second scattering coefficient.

22. The light diffusing tip of claim 20, wherein the conical portion is substantially coaxial with a longitudinal axis of the housing.

23. The light diffusing tip of claim 20, wherein the conical portion is offset from a longitudinal axis of the housing.

24. The light diffusing tip of claim 20, further comprising a cap disposed at an end of the housing.

25. The light diffusing tip of claim 24, wherein the cap comprises at least one of a pointed cap, a rounded cap or a light-scattering cap.

26. The light diffusing tip of claim 20, further comprising a reflective material disposed at a surface of the housing.

27. The light diffusing tip of claim 20, further comprising a non-stick material disposed at an outer surface of the housing.

28. The light diffusing tip of claim 20, wherein the substantially conical portion has a larger cross-section near the distal end of the housing and decreases in cross-section with axial distance from the distal end of the housing.

29. The light diffusing tip of claim 20, wherein the housing is coextensive with a tip of at least one optical waveguide.

30. The light diffusing tip of claim 29, wherein the housing is approximately tubular and has an outer diameter substantially equivalent to an outer diameter of an outer jacketing that sheaths the at least one optical waveguide.

31. An apparatus comprising:

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, the light diffusing tip comprising;

a housing; and

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

a first scattering region at a first position, the first 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.

32. The apparatus of claim 31, wherein the first scattering property includes a first concentration of a first type of scattering particle and the second scattering property includes a second concentration of the first type of scattering particle.

33. The apparatus of claim 31, wherein the first scattering property includes a first type of scattering particle and the second scattering property includes a second type of scattering particle.

34. The apparatus of claim 31, wherein a light scattering coefficient of the first scattering region is less than a light scattering coefficient of the second scattering region.

35. The apparatus of claim 34, wherein the first scattering region is at a proximal end of the housing and the second scattering region is at a distal end of the housing and wherein a light scattering coefficient of the light diffusing tip at the substantial portion of the length of the housing increases with a distance from the proximal end of the housing.

36. The apparatus of claim 31, wherein a cross-section of the first scattering region and a cross-section of the second scattering region vary across the substantial portion of the length of the housing.

37. The apparatus of claim 31, wherein the first scattering region comprises an approximately conical shape across the substantial portion of the length of the housing.

38. The apparatus of claim 37, wherein the approximately conical shape is substantially coaxial with a longitudinal axis of the housing.

39. The apparatus of claim 37, wherein the approximately conical shape is offset from a longitudinal axis of the housing.

40. The apparatus of claim 31, wherein the first scattering region comprises a non-linear profile across the substantial portion of the length of the housing.

41. The apparatus of claim 31, further comprising a cap disposed at an end of the housing.

42. The apparatus of claim 41, wherein the cap comprises at least one of a pointed cap, a rounded cap, a biocompatible cap, or a light-scattering cap.

43. The apparatus of claim 31, further comprising a reflective material disposed at a surface of the housing.

44. The apparatus of claim 31, further comprising a non-stick material disposed at an outer surface of the housing.

45. The apparatus of claim 31, wherein the housing is approximately tubular and has an outer diameter substantially equivalent to an outer diameter of an outer jacketing that sheaths the at least one optical waveguide.