Medical laser handpiece
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 -φ
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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Abstract
A laser handpiece is configured by a main body 13 and a laser probe 10 mounted on the tip end of the main body 13. The laser probe 10 has an emission fiber 12. A laser beam generated by a laser beam source is emitted from an emission end portion 22 of the emission fiber 12. The emission end portion 22 of the emission fiber 12 is formed into a circular conical shape. The laser beam emitted from the emission end portion 22 contains a first laser beam which is emitted in the axial direction of the emission fiber 22, and a second laser beam which is emitted in a ring-like shape in a radial direction of the emission fiber 12.
97 Citations
11 Claims
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1. A medical laser handpiece comprising:
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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, and wherein 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 that sin φ
0 =n0 /n1sin φ
1 =n2 /n12(φ
1 -φ
0) is less than or equal to θwherein 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. - View Dependent Claims (2, 3, 5, 6, 7, 8, 9, 10, 11)
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4. A medical laser handpiece comprising:
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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 the core of an emission end portion of the emission fiber, and wherein the core of the emission end portion has a first emission face of a spherical shape forming a tip of the emission end portion, and from the first emission face are emitted a first laser beam in an axial direction of the emission fiber and a second emission face of a circular conical shape having a conical angle θ
, from the second emission face are emitted a second laser beam in a ring-like shape in a radial direction of the emission fiber;a refractive index of an external space n0, of the core n1 and of the clad n2 is each selected such that sin φ
0 =n0 /n1sin φ
1 =n2 /n12(φ
1 -φ
0) is less than or equal to θwherein 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;the first and the second emission faces are formed so as to be tangential to each other over the whole periphery with respect to the optical axis, and a sectional area ratio of a first area of a section including the boundary line of the first and the second emission faces to a second area of the whole of the core is chosen to be 1-20%.
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Specification