Optical fiber diffusion tip for uniform illumination

Details Optical fiber diffusion tip for uniform illumination Optical fiber diffusion tip for uniform illumination

A - Human Necessities

61

N

A61N 5/06 (2006.01) A61B 18/24 (2006.01) A61M 25/10 (2006.01) A61B 18/22 (2006.01)

Patent

CA 2015554

Abstract of the Disclosure OPTICAL FIBER DIFFUSION TIP FOR UNIFORM ILLUMINATION A diffusion tip coupled to the end of an optical fiber for directing laser energy outwardly in a cylindrical or other desired radiation pattern. The diffusion tip includes a core, a cladding around the core and a jacket around the cladding. The cladding has an index of refraction that is lower than that of the core and has a thickness selected to transmit a portion of the laser radiation that is carried through the optical fiber so that laser radiation penetrates through the cladding and the jacket over the length of the diffusion tip. The thickness of the cladding is about the same as or slightly less than the penetration depth of the evanescent field in the cladding. The cladding can be tapered along the length of the diffusion tip to provide a uniform radiation pattern. The diffusion tip is particularly useful in a laser balloon catheter utilized in coronary angioplasty.

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