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Medical laser handpiece

  • US 6,162,052 A
  • Filed: 01/29/1998
  • Issued: 12/19/2000
  • Est. Priority Date: 01/31/1997
  • Status: Expired due to Term
First Claim
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1. 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 θ

    , 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 n0, of the core n1 and of the clad n2 is each selected such thatsin φ

    0 =n0 /n1sin φ

    1 =n2 /n12(φ

    1

    0) is less than or equal to θ

    wherein φ

    0 is a critical angle of incidence of said laser beam with an inner surface of said circular conical shape and φ

    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.

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