CPC G02B 23/2469 (2013.01) [G02B 6/0008 (2013.01); A61N 5/0601 (2013.01); A61N 5/062 (2013.01); A61N 2005/063 (2013.01)] | 20 Claims |
1. A light irradiation device having an elongated outer shape, the light irradiation device comprising:
an optical fiber configured to emit a light from a distal end of the optical fiber and including a curved part, the curved part orienting the distal end in a direction intersecting with a longitudinal direction of the light irradiation device; and
a light transmitting holder holding the curved part so as to maintain a shape of the curved part, wherein
the optical fiber includes a core and an outer surface layer, and
the holder has a refractive index lower than a refractive index of the outer surface layer of the optical fiber.
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