Patent ID: 6162052
Filing Date: 2000-12-19
Classification: A61B,A61C

Abstract:
A medical laser handpiece comprising:a main body and a laser probe attached to the main body, the laser probe including an emission fiber including a core and a clad surrounding the core, a laser beam generated by a laser beam source being emitted from an emission end portion of the emission fiber, andwherein the emission end portion of the emission fiber is formed into a circular conical shape having a conical angle .theta., and from the emission end portion are emitted a first laser beam in an axial direction of the emission fiber and a second laser beam in a ring-like shape in a radial direction of the emission fiber, and characterized in that:a refractive index of an external space n.sub.0, of the core n.sub.1 and of the clad n.sub.2 is each selected such thatsin .phi..sub.0 =n.sub.0 /n.sub.1sin .phi..sub.1 =n.sub.2 /n12(.phi..sub.1 -.phi..sub.0) is less than or equal to .theta.wherein .phi..sub.0 is a critical angle of incidence of said laser beam with an inner surface of said circular conical shape and .phi..sub.1 is a critical angle of incidence of said laser beam with an inner surface of said clad of the emission fiber;whereby 1-20% of a laser beam entering the emission fiber is emitted as the first laser beam from the emission end portion, and 80-99% of the laser beam is emitted as the second laser beam from the emission end portion.