Laser irradiation tip, laser irradiation handpiece, laser treatment apparatus, and laser irradiation tip end member

A laser irradiation tip comprising:

• a main body connected with a handpiece, wherein the main body irradiates therapeutic laser with absorbability in water, and
• a tip end portion connected with said main body,
• wherein said main body of said laser irradiation tip comprises:
• an optical fiber that guides said therapeutic laser,
• a water flow path, and
• an air flow path,
• said optical fiber, said water flow path, and said air flow path being coaxially arranged in said main body,
• wherein said tip end portion of said laser irradiation tip comprises:
• a connection portion that connects with said main body,
• a water guide path that communicates with said water flow path of said main body,
• an air guide path that communicates with said air flow path of said main body,
• a fiber guide portion that inserts a tip side portion of said optical fiber so as to project from a front end surface of said tip end portion, and
• a mixing chamber of water and air having a concaved form such that the mixing chamber opens on said front end surface of said tip end portion and dents toward a main body side of said laser irradiation tip,
• wherein openings of said water guide path and said air guide path are arranged at a bottom of said concaved form of said mixing chamber, and
• wherein said mixing chamber is configured to mix water from said water guide path and air from said air guide path and spray mixed mist of water and air substantially parallel to said therapeutic laser in an irradiation direction of said therapeutic laser from a spray end at an opening of said mixing chamber.