WO2023026988A1 - 照射プローブおよび照射プローブシステム - Google Patents

照射プローブおよび照射プローブシステム Download PDF

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Publication number
WO2023026988A1
WO2023026988A1 PCT/JP2022/031414 JP2022031414W WO2023026988A1 WO 2023026988 A1 WO2023026988 A1 WO 2023026988A1 JP 2022031414 W JP2022031414 W JP 2022031414W WO 2023026988 A1 WO2023026988 A1 WO 2023026988A1
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WIPO (PCT)
Prior art keywords
light
irradiation probe
probe
irradiation
optical fibers
Prior art date
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Ceased
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PCT/JP2022/031414
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English (en)
French (fr)
Japanese (ja)
Inventor
真木 岩間
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Furukawa Electric Co Ltd
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Furukawa Electric Co Ltd
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Priority to JP2023543881A priority Critical patent/JPWO2023026988A1/ja
Priority to EP22861276.8A priority patent/EP4393542A4/en
Publication of WO2023026988A1 publication Critical patent/WO2023026988A1/ja
Priority to US18/429,650 priority patent/US20240167949A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/47—Scattering, i.e. diffuse reflection
    • G01N21/4738—Diffuse reflection, e.g. also for testing fluids, fibrous materials
    • G01N21/474—Details of optical heads therefor, e.g. using optical fibres
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N5/00—Radiation therapy
    • A61N5/06—Radiation therapy using light
    • A61N5/067—Radiation therapy using light using laser light
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B18/18—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by applying electromagnetic radiation, e.g. microwaves
    • A61B18/20—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by applying electromagnetic radiation, e.g. microwaves using laser
    • A61B18/22—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by applying electromagnetic radiation, e.g. microwaves using laser the beam being directed along or through a flexible conduit, e.g. an optical fibre; Couplings or hand-pieces therefor
    • A61B18/24—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by applying electromagnetic radiation, e.g. microwaves using laser the beam being directed along or through a flexible conduit, e.g. an optical fibre; Couplings or hand-pieces therefor with a catheter
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N5/00—Radiation therapy
    • A61N5/06—Radiation therapy using light
    • A61N5/0601—Apparatus for use inside the body
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N5/00—Radiation therapy
    • A61N5/06—Radiation therapy using light
    • A61N2005/063—Radiation therapy using light comprising light transmitting means, e.g. optical fibres
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/47—Scattering, i.e. diffuse reflection
    • G01N21/4738—Diffuse reflection, e.g. also for testing fluids, fibrous materials
    • G01N21/474—Details of optical heads therefor, e.g. using optical fibres
    • G01N2021/4742—Details of optical heads therefor, e.g. using optical fibres comprising optical fibres
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/47—Scattering, i.e. diffuse reflection
    • G01N21/4738—Diffuse reflection, e.g. also for testing fluids, fibrous materials
    • G01N21/474—Details of optical heads therefor, e.g. using optical fibres
    • G01N2021/4752—Geometry
    • G01N2021/4759—Annular illumination
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/47—Scattering, i.e. diffuse reflection
    • G01N21/4738—Diffuse reflection, e.g. also for testing fluids, fibrous materials
    • G01N21/474—Details of optical heads therefor, e.g. using optical fibres
    • G01N2021/4752—Geometry
    • G01N2021/4761—Mirror arrangements, e.g. in IR range
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2201/00—Features of devices classified in G01N21/00
    • G01N2201/06—Illumination; Optics
    • G01N2201/069—Supply of sources
    • G01N2201/0696—Pulsed
    • G01N2201/0697—Pulsed lasers
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/04—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings formed by bundles of fibres

Definitions

  • the present invention relates to irradiation probes and irradiation probe systems.
  • the light in which the light is emitted from the side to the entire surroundings, the light reaches, for example, a region in the living body that originally does not need to be irradiated with light or should not be irradiated with light. There is a possibility that the light will be irradiated in vain.
  • one of the objects of the present invention is to provide a novel and improved illumination probe and illumination probe system, such that, for example, the illumination direction of light from the side of the probe can be switched around the axis of the probe. That is.
  • the irradiation probe of the present invention is, for example, an irradiation probe that bundles a plurality of optical fibers each having a leakage section that outputs leaked light radially outward as at least a partial section in the longitudinal direction, wherein the optical fiber:
  • Each of the optical fibers has a directivity in which the intensity of leaked light in a specific radial direction is higher than the intensity of leaked light in other radial directions in a cross section that intersects the axial direction of the leaking section, are arranged apart from each other in different radial directions from the central axis of the irradiation probe, and are bundled in such a manner that the leaked light from the leaking sections in the specific radial direction faces radially outward of the irradiation probe.
  • the irradiation probe of the present invention is, for example, an irradiation probe that bundles a plurality of optical fibers each having a leakage section that outputs leaked light radially outward as at least a partial section in the longitudinal direction, wherein the irradiation probe includes: a reflecting member positioned at least radially inward of the illumination probe relative to the optical fiber for reflecting leaked light from the optical fiber, the optical fibers intersecting the axial direction of the leakage section, respectively; In the cross section, the intensity of leaked light in a specific radial direction is higher than the intensity of leaked light in other radial directions, and the optical fibers have different diameters from the central axis of the irradiation probe. are spaced apart in the direction, and bundled in such a manner that the leaked light in the specific radial direction from the leakage section is directed radially inward of the illumination probe.
  • At least one of the optical fibers in the leakage section may have a scattering region that scatters light in a predetermined range in the circumferential direction of the optical fiber.
  • the outer peripheral surface of the optical fiber in the scattering region is a convex curved surface in which the average radius of curvature in the scattering region is equal to or greater than the radius of a general region outside the scattering region, in the radial direction of the optical fiber. or a concave curved surface that is concave inward in the radial direction.
  • the optical fibers are respectively spaced apart in different radial directions from the central axis of the irradiation probe, and the leaked light from the respective leakage sections of the optical fibers is emitted in the radial direction of the irradiation probe. It may have a shielding member that blocks the inward or circumferential direction.
  • the irradiation probe of the present invention is, for example, an irradiation probe that bundles a plurality of optical fibers each having a leakage section that outputs leaked light radially outward as at least a partial section in the longitudinal direction, wherein the optical fiber: Shields respectively spaced apart in different radial directions from the central axis of the illumination probe to block the leaked light from the leaking section of each of the optical fibers from traveling radially inward or circumferentially of the illumination probe. have members.
  • the shielding member may reflect the leaked light.
  • the shielding member may have an intervening portion positioned between two optical fibers among the plurality of optical fibers in the circumferential direction of the irradiation probe.
  • the shielding member may have an opaque fiber that does not transmit leaked light.
  • the shielding member is positioned radially inside the irradiation probe with respect to the optical fiber as the impermeable fiber, or is positioned radially inward of the irradiation probe with respect to the optical fiber, or is located in two of the plurality of optical fibers in the circumferential direction of the irradiation probe. It may also include a first opaque fiber positioned between the two optical fibers.
  • the shielding member includes, as the opaque fibers, two first opaque fibers adjacent to each other, and a side near the optical fiber with respect to the boundary between the two first opaque fibers. a second opaque fiber located at the .
  • the shielding member may have a metal member.
  • the metal member may have conductivity.
  • the shielding member may have a coating as the metal member, and a core member surrounded by the coating and made of a material having an elastic modulus smaller than that of the metal member.
  • the shielding member may have an extension extending in a radial direction of the irradiation probe at least in the leak section.
  • a plurality of extension portions as the extension portions may be integrated inside the irradiation probe in the radial direction.
  • the shielding member includes a sleeve that partially covers the outer periphery of the optical fiber at least in the leak section and has an opening that extends in the longitudinal direction and opens radially outward of the irradiation probe.
  • the irradiation probe is a projected portion projected by the projection light of the irradiation probe, and when the projection light is projected in the radial direction of the irradiation probe, the projected shape by the projection light is the center of the irradiation probe.
  • the projected part may be configured differently depending on the rotational orientation about the axis.
  • the projection target portions are spaced apart from each other in the longitudinal direction, and are spaced apart from each other in the circumferential direction of the irradiation probe at a central angle different from 0° or 180° when viewed in the longitudinal direction. It may have at least two parts that are aligned.
  • the optical fiber may have an outer scattering portion positioned radially outward of the irradiation probe in the leakage section and scattering light.
  • the optical fiber may have an inner scattering portion positioned radially inside the irradiation probe in the leakage section and scattering light.
  • the irradiation probe may include a core wire extending in the longitudinal direction of the irradiation probe, and the plurality of optical fibers may be arranged along the outer circumference of the core wire.
  • the diameter of the core wire may be larger than the diameter of the optical fiber.
  • the plurality of optical fibers may be at least partially accommodated in recesses provided in the core wire.
  • the core wire may include a portion made of a synthetic resin material.
  • the core wire may have a scatterer.
  • the irradiation probe system of the present invention includes, for example, the irradiation probe, a light source, and a switching mechanism that selectively inputs light from the light source into at least one of the plurality of optical fibers.
  • the irradiation probe system of the present invention is, for example, an irradiation probe, and a plurality of optical fibers arranged side by side in the circumferential direction of the irradiation probe and capable of leaking light radially outward from each outer peripheral surface in a longitudinal leakage section.
  • the irradiation probe system may include a plurality of light sources as the light sources.
  • the irradiation probe system may include a control mechanism for controlling at least one of the light source and the switching mechanism so that the light from the light source is intermittently input to the optical fiber.
  • the switching mechanism may operate so that the optical fiber into which the light from the light source is input is sequentially switched over time in the circumferential direction of the irradiation probe.
  • FIG. 1 is an exemplary schematic configuration diagram of the illumination probe system of the first embodiment.
  • FIG. 2 is an exemplary and schematic cross-sectional view of the irradiation probe of the first embodiment.
  • FIG. 3 is an exemplary and schematic cross-sectional view of a portion of the optical fiber of the irradiation probe of the first embodiment;
  • FIG. 4 is an exemplary block diagram of an embodiment illumination probe system.
  • FIG. 5 is an exemplary schematic cross-sectional view of an irradiation probe showing an example of a change over time in the irradiation state of light by the irradiation probe system of the embodiment.
  • FIG. 1 is an exemplary schematic configuration diagram of the illumination probe system of the first embodiment.
  • FIG. 2 is an exemplary and schematic cross-sectional view of the irradiation probe of the first embodiment.
  • FIG. 3 is an exemplary and schematic cross-sectional view of a portion of the optical fiber of the irradiation probe of the first embodiment;
  • FIG. 4 is an
  • FIG. 6 is an exemplary schematic cross-sectional view of an irradiation probe showing an example of a change over time in the irradiation state of light by the irradiation probe system of the embodiment.
  • FIG. 7 is an exemplary schematic diagram of the switching mechanism of the illumination probe system of the second embodiment.
  • FIG. 8 is an exemplary schematic diagram of the switching mechanism of the irradiation probe system of the second embodiment, showing a state different from that of FIG.
  • FIG. 9 is an exemplary schematic diagram of the switching mechanism of the irradiation probe system of the second embodiment, showing a state different from FIGS.
  • FIG. 10 is a schematic cross-sectional view of a modification of the scattering region of the irradiation probe of the embodiment.
  • FIG. 11 is a schematic cross-sectional view of a modification of the scattering region of the irradiation probe of the embodiment.
  • FIG. 12 is a schematic cross-sectional view of a modification of the scattering region of the irradiation probe of the embodiment.
  • FIG. 13 is a schematic side view of a modification of the scattering region of the irradiation probe of the embodiment;
  • FIG. 14 is a schematic cross-sectional view of a modification of the scattering region of the irradiation probe of the embodiment.
  • FIG. 15 is an exemplary schematic cross-sectional view of an irradiation probe according to a modification of the embodiment; FIG.
  • FIG. 16 is an exemplary schematic cross-sectional view of an irradiation probe according to a modification of the embodiment; 17 is an enlarged view of a portion of FIG. 16.
  • FIG. FIG. 18 is an exemplary schematic cross-sectional view of part of an irradiation probe according to a modification of the embodiment;
  • FIG. 19 is an exemplary schematic cross-sectional view of part of an irradiation probe according to a modification of the embodiment;
  • FIG. 20 is an exemplary and schematic cross-sectional view of part of an irradiation probe according to a modification of the embodiment;
  • FIG. 21 is an exemplary and schematic cross-sectional view of part of an irradiation probe according to a modification of the embodiment;
  • FIG. 21 is an exemplary and schematic cross-sectional view of part of an irradiation probe according to a modification of the embodiment;
  • FIG. 22 is an exemplary schematic cross-sectional view of part of an irradiation probe according to a modification of the embodiment
  • FIG. 23 is an exemplary schematic cross-sectional view of an irradiation probe according to a modification of the embodiment
  • FIG. 24 is an exemplary schematic cross-sectional view of an irradiation probe according to a modification of the embodiment
  • FIG. 25 is an exemplary schematic cross-sectional view of an irradiation probe according to a modification of the embodiment
  • FIG. 26 is an exemplary schematic cross-sectional view of an irradiation probe according to a modification of the embodiment
  • FIG. 27 is an exemplary schematic cross-sectional view of an irradiation probe according to a modification of the embodiment
  • FIG. 28 is an exemplary schematic cross-sectional view of part of an optical fiber of a modified example of the embodiment
  • FIG. 29 is an exemplary schematic side view of a shielding member provided at the end of the irradiation probe of the modified example of the embodiment.
  • FIG. 30 is an exemplary schematic side view of the shielding member of FIG. 29 that differs from that of FIG. 29 in rotational posture about the central axis.
  • FIG. 31 is an exemplary and schematic explanatory diagram of a shielding member provided at an end portion of an irradiation probe according to a modified example of the embodiment;
  • FIG. 32 is an exemplary and schematic explanatory view of a shielding member of FIG. 31 whose rotational posture about the central axis is different from that of FIG.
  • FIG. 33A and 33B are exemplary and schematic explanatory diagrams of a shielding member provided at an end portion of an irradiation probe according to a modification of the embodiment;
  • FIG. 34A and 34B are exemplary and schematic explanatory diagrams of the shielding member of FIG. 33 having different rotational postures about the central axis.
  • the X direction is the axial direction (longitudinal direction) of the irradiation probe 10 .
  • FIG. 1 is a schematic diagram of an irradiation probe system 1 according to an embodiment.
  • the irradiation probe system 1 includes a light output device 100, an irradiation probe 10, a control device 200, a delivery optical fiber 20, and an input section 220.
  • the light output device 100 has multiple light source units 110 .
  • Each of the light source units 110 has a light source that outputs laser light and an optical system that guides the light from the light source to the delivery optical fiber 20 (both not shown).
  • the light source includes, for example, a laser element that outputs laser light.
  • the light output device 100 has a plurality of light source units 110 , that is, light sources, as an example in this embodiment, but is not limited to this, and may have at least one light source unit 110 .
  • Each light source unit 110 and the irradiation probe 10 are optically connected via a delivery optical fiber 20 provided corresponding to the light source unit 110 .
  • the irradiation probe 10 includes a plurality of optical fibers, has an elongated substantially cylindrical and linear shape, and is flexible.
  • the irradiation probe 10 also has an end portion 10a that is one end in the axial direction and an end portion 10b that is the other end in the axial direction.
  • the end portion 10a is an input end into which light from the light source unit 110 is input, and can also be referred to as a base end.
  • the end portion 10b is located on the opposite side of the end portion 10a in the axial direction and can also be referred to as a tip.
  • the irradiation probe 10 has a leak section 11 and a transmission section 12 .
  • the leaking portion 11 is provided over a predetermined length in the axial direction at a position away from the end portion 10a, and is a section that leaks light radially outward from the outer peripheral surface 10c of the irradiation probe 10. As shown in FIG. The leaked light from the outer peripheral surface 10 c as the side surface of the leaking portion 11 is the irradiated light from the irradiation probe 10 .
  • the transmitting portion 12 may be provided between the end portion 10a and the leaking portion 11, between the leaking portion 11 and the end portion 10b, or when a plurality of leaking portions 11 are provided at intervals in the axial direction.
  • the leak portion 11 is provided only in a section adjacent to the end portion 10b, but is not limited to this, and may be provided apart from the end portion 10b.
  • the control device 200 can control the light source unit 110, for example, to output light or stop outputting light.
  • the control device 200 can also control the operation of devices and parts other than the light source unit 110 in the irradiation probe system 1 .
  • the input unit 220 constitutes a user interface operated by an operator (user), and inputs an instruction signal to the control device 200 according to the operator's operation input.
  • the control device 200 is an example of a control mechanism, and the input section 220 is an example of an operation input section.
  • FIG. 2 is a cross-sectional view of the leakage portion 11 of the irradiation probe 10.
  • the illumination probe 10 has a plurality of bundled optical fibers 30 and a coating 13 transparent to light transmitted through the optical fibers 30 .
  • the irradiation probe 10 has three optical fibers 30, but the number of optical fibers 30 is not limited to three, and may be two, or four or more. There may be.
  • the plurality of optical fibers 30 are arranged around the central axis Ax1 of the irradiation probe 10 at substantially equal intervals and substantially rotationally symmetrical. In other words, the optical fibers 30 are shifted from the center axis Ax1 of the irradiation probe 10 in different radial directions D1 to D3.
  • the irradiation probe 10 may have a holding member (not shown) that holds the plurality of optical fibers 30 in a predetermined relative positional relationship in a cross section that intersects the axial direction of the leakage portion 11 .
  • the optical fibers 30 are optically connected to the delivery optical fibers 20 respectively.
  • the optical fiber 30 and the delivery optical fiber 20 may be directly connected by fusion splicing or the like or indirectly via a coupling portion or the like. It may be made from fiber.
  • Each optical fiber 30 has a core 31 and a clad (not shown) surrounding the core 31 .
  • the optical fiber 30 has a core 31 and a clad.
  • the cladding is substantially removed from each optical fiber 30, and only the cores 31 are bundled. That is, in the example of FIG. 2 , the outer peripheral surface 30 a of each optical fiber 30 is the outer peripheral surface of the core 31 .
  • the scattering region 33 In the leaking portion 11, at least one of the outer peripheral surface 30a and a range having a predetermined depth in the vicinity of the outer peripheral surface 30a is provided with a scattering region 33 that scatters light.
  • the scattering region 33 extends in the circumferential direction. Specifically, as shown in FIG. 2, the scattering region 33 is a partial section in the circumferential direction, specifically, a predetermined central angle (in FIG. 2, , as an example, 60 deg) or a range in the vicinity thereof. Moreover, although not shown, the scattering region 33 also extends in the axial direction (longitudinal direction). In other words, the scattering region 33 is provided over a predetermined lengthwise section in the leaking portion 11 .
  • the scattering region 33 may be provided all over the leaking portion 11 , may be provided in a part of the leaking portion 11 , or may be intermittently provided at a plurality of locations of the leaking portion 11 . Note that when a plurality of scattering regions 33 are provided in the leaking portion 11, the scattering regions 33 are provided so as to line up in the longitudinal direction.
  • the section provided with the scattering region 33 is an example of a leaky section.
  • the leak section is included in the leak section 11 .
  • the leaky section of the optical fiber 30 in which the scattering region 33 is provided is part of the component of the leaky portion 11 of the illumination probe 10 .
  • FIG. 3 is a cross-sectional view of the optical fiber 30 at the site where the scattering region 33 is provided.
  • the outer peripheral surface 30a is provided with a plurality of recesses 33a.
  • the light transmitted through the core 31 is refracted and scattered at the concave portion 33a and leaks out of the core 31, that is, out of the optical fiber 30 from the outer peripheral surface 30a.
  • the recesses 33a are provided discretely, and the size and depth of the recesses 33a are not constant.
  • the plurality of recesses 33a may be arranged regularly, or the specifications such as the size, depth, and shape of the plurality of recesses 33a may be substantially constant.
  • the outer peripheral surface 30a may be provided with convex portions instead of the concave portions 33a.
  • the protrusion may be, for example, a portion between the recesses 33a.
  • the concave portion 33a and the convex portion facilitate the leakage of light from the core 31 to the outside in the radial direction.
  • the distribution of the light leakage intensity in the axial direction and the circumferential direction of the leaking portion 11 is appropriately adjusted. can do.
  • the intensity distribution of the leaked light in the circumferential direction in the cross section that intersects the axial direction of the optical fiber 30 has a central axis Ax2 of the optical fiber 30.
  • the intensity of leaked light in a specific radial direction (outside in the radial direction) from the optical fiber is higher than the intensity of leaked light in other radial directions, that is, an optical fiber having directivity.
  • the intensity of leaked light in the radial direction Df is higher than the intensity in other radial directions.
  • the radial direction Df is an example of a specific radial direction.
  • the specific radial direction is defined as the radial direction in which the intensity distribution of the leaked light from the optical fiber 30 in the circumferential direction of the optical fiber 30 has a peak.
  • radial directions for example, two directions
  • each of them is assumed to be a specific radial direction.
  • the optical fibers 30 having the directivity of the leaked light as described above are separated from the central axis Ax1 of the irradiation probe 10 in different radial directions D1 to D3. are placed.
  • the optical fibers 30 are bundled in the leaking portion 11 in such a posture that the leaked light from the scattering region 33 in the radial direction Df is directed radially outward of the irradiation probe 10 .
  • FIG. are output in radial directions D1 to D3 (outside in the radial direction) of the irradiation probe 10, which are different from each other.
  • the light source unit 110 is optically connected to optical fibers 30 different from each other. Therefore, the control device 200 controls the light output device 100 so that one of the plurality of light source units 110 selectively outputs light, thereby outputting the leaked light from the plurality of optical fibers 30. Fiber 30 can be selected.
  • the leaked light is output from the leaking portion 11 of the irradiation probe 10 in different radial directions D1 to D3 depending on the optical fiber 30.
  • Control device 200 is an example of a switching mechanism.
  • FIG. 4 is a block diagram of the illumination probe system 1.
  • the irradiation probe system 1 includes a control device 200, an input section 220, and an output section 230.
  • the input unit 220 and the output unit 230 construct a user interface for users and operators.
  • the input unit 220 is, for example, an input device such as a remote controller, an operation unit such as a switch box or joystick, a keyboard, a touch panel, a mouse, a switch, or an operation button.
  • the output unit 230 is, for example, a display, a printer, a lamp, a speaker, or the like, and is an output device for images, printing, and sound.
  • the control device 200 also has a controller 210 , a main storage unit 241 and an auxiliary storage device 242 .
  • the controller 210 is, for example, a processor (circuit) such as a CPU (central processing unit).
  • the main storage unit 241 is, for example, RAM (random access memory) or ROM (read only memory).
  • the auxiliary storage device 242 is, for example, a non-volatile rewritable storage device such as an SSD (solid state drive) or HDD (hard disk drive).
  • the controller 210 operates as an irradiation control unit 211, an input control unit 212, and an output control unit 213 by reading programs stored in the main storage unit 241 and the auxiliary storage device 242 and executing each process.
  • the program can be provided as an installable file or an executable file recorded on a computer-readable recording medium.
  • a recording medium may also be referred to as a program product.
  • Values used in arithmetic processing by programs and processors, information such as maps and tables may be stored in advance in the main storage unit 241 and auxiliary storage device 242, or may be stored in the storage unit of a computer connected to a communication network. and stored in the auxiliary storage device 242 by being downloaded via the communication network.
  • Auxiliary storage device 242 stores data written by the processor.
  • the computational processing by controller 210 may be performed, at least in part, by hardware.
  • the controller 210 may include, for example, an FPGA (field programmable gate array) or an ASIC (application specific integrated circuit).
  • the irradiation control unit 211 can individually control light output and output stop for each of the light source units 110 included in the light output device 100 .
  • the irradiation control unit 211 can switch the light source unit 110 that outputs light among the plurality of light source units 110 (light sources) according to the operator's operation input to the input unit 220 . That is, the irradiation direction (radial directions D1 to D3) of the light from the irradiation probe 10 is switched by the operation of the irradiation control unit 211 .
  • the input control section 212 receives an input signal from the input section 220 . Further, the input control section 212 may control the input section 220 so that a predetermined operation input is possible.
  • the output control unit 213 controls the output unit 230 to perform a predetermined output.
  • Example of irradiation control 5 and 6 are cross-sectional views of the leaking portion 11 showing an example of the temporal change in the state of light irradiation by the irradiation probe 10.
  • the irradiation control unit 211 sequentially switches the three light source units 110 between an operating state and an operating stop state, thereby allowing light to be input from the light output device 100 to the optical fiber 30-1.
  • the state in which the light is input to the optical fiber 30-2 and the state in which the light is input to the optical fiber 30-3 are sequentially and repetitively switched.
  • the irradiation light as the leaked light is output from the leaking portion 11 in the radial direction D1 (upward in FIG. 5) and in the radial direction D2 (lower left in FIG. 5).
  • and output in the radial direction D3 (lower right in FIG. 5) are sequentially and repetitively switched.
  • the irradiation light from the irradiation probe 10 rotates around the central axis Ax1 of the irradiation probe 10 .
  • the irradiation control unit 211 switches between the operation state and the operation stop state of one light source unit 110 to input light from the light output device 100 to the optical fiber 30-1, A state in which light is not input to any optical fiber 30 is alternately switched.
  • the irradiation light as leaked light is intermittently output in the radial direction D1 (upward in FIG. 6).
  • the irradiation light output in the radial direction D1 blinks at predetermined time intervals.
  • the light (leakage light, irradiation light) from the irradiation probe 10 is emitted without changing the rotational posture of the irradiation probe 10 about the central axis Ax1.
  • the irradiation direction can be switched. Therefore, for example, when the irradiation probe 10 irradiates a region different from the region to be irradiated with light, or when the light is irradiated in a plurality of different radial directions, when switching the irradiation direction, A change in the rotational posture of the irradiation probe 10 is not necessary or can be minimized, so that the irradiation direction can be changed more easily or more quickly.
  • the control device 200 by operating the control device 200, the light is rotated around the central axis Ax1 of the irradiation probe 10 or blinked, thereby adjusting the irradiation intensity of the light, the irradiation area, and the irradiation timing. , it becomes easier to achieve a more appropriate light irradiation state for the affected area.
  • FIG. 7 to 9 are schematic diagrams of the switching mechanism 40 included in the irradiation probe system 1 of the second embodiment.
  • 7 shows the state in which the light from the light output device 100 is input to the optical fiber 30-1
  • FIG. 8 shows the state in which the light from the light output device 100 is input to the optical fiber 30-2.
  • FIG. 9 also shows a state in which light from the light output device 100 is input to the optical fiber 30-3.
  • the switching mechanism 40 can select the optical fiber 30 that inputs light from the delivery optical fiber 20, that is, the optical fiber 30 that leaks and outputs light in the leaking portion 11. .
  • the switching mechanism 40 has, for example, a movable portion 40a that can move in the Y direction in FIGS. 3.
  • the switching mechanism 40 also has a drive mechanism (not shown) that can change the position of the movable portion 40a in the Y direction.
  • the drive mechanism includes, for example, a motor, a reduction mechanism that reduces rotation of the motor, and a motion conversion mechanism that converts rotation of the reduction mechanism into linear motion of the movable portion 40a along the Y direction.
  • the operation of the switching mechanism 40 (driving mechanism) is controlled by a switching control section 214 included in the controller 210, as shown in FIG.
  • the drive mechanism is not limited to such a configuration, and may have another mechanism such as an electromagnetic solenoid, for example.
  • the switching mechanism 40 changes the position of the movable part 40a in the Y direction so that the light from the light output device 100 is reflected by the mirror 40b-1 and coupled to the optical fiber 30-1.
  • state (FIG. 7)
  • light from the light output device 100 is coupled to the optical fiber 30-2 without passing through the mirrors 40b-1 and 40b-3 (FIG. 8)
  • light from the light output device 100 is The state of being reflected by the mirror 40b-3 and coupled to the optical fiber 30-3 (FIG. 9) can be switched.
  • the configuration of the irradiation probe 10 is the same as that of the first embodiment. Therefore, according to the present embodiment as well, light can be selectively output from any one of the plurality of optical fibers 30 in the leak portion 11, thereby providing the same effects and effects as those of the first embodiment. effect can be obtained.
  • the number of light source units 110 in the light output device 100 can be reduced accordingly.
  • Advantages such as the ability to configure the light output device 100 to be smaller or lighter, and the labor and cost of manufacturing the light output device 100 can be reduced.
  • FIG. 10 and 11 are cross-sectional views each showing an example of the configuration of the scattering region 33.
  • FIG. 10 and 11 are cross-sectional views each showing an example of the configuration of the scattering region 33.
  • FIG. 10 and 11 are cross-sectional views each showing an example of the configuration of the scattering region 33.
  • FIG. 10 Inside the optical fiber 30 in which the scattering region 33 is formed, particles 33b are contained in the example of FIG. 10, and holes 33c are contained in the example of FIG.
  • the particles 33b and the holes 33c may be nanostructures with a diameter of 100 [nm] or less, for example.
  • Particles 33b may be, for example, microparticles or fillers such as microtubes.
  • the traveling direction of the light is changed by the particles 33b and the holes 33c, that is, the light is scattered, so the light tends to leak outward in the radial direction from the outer peripheral surface 30a.
  • FIG. 12 is a cross-sectional view showing another example of the configuration of the scattering region 33.
  • the outer peripheral surface 30 a of the optical fiber 30 is inclined with respect to the X direction, which is the longitudinal direction of the optical fiber 30 .
  • the outer peripheral surface 30a is, for example, a tapered surface. In this manner, at a portion where the shape of the outer peripheral surface 30a changes in the X direction, for example, light is incident on the portion exceeding the critical angle, so light tends to leak radially outward from the outer peripheral surface 30a.
  • Particles 33b and holes 33c may also be referred to as scattering elements.
  • FIG. 13 is a side view showing another example of the configuration of the scattering region 33.
  • the scattering region 33 is curved. Light leaks easily from the bent portion. That is, even with the configuration of FIG. 13, light tends to leak radially outward from the outer peripheral surface 30a.
  • FIG. 14 is a cross-sectional view showing another example of the configuration of the scattering region 33.
  • the scattering region 33 has a coating layer 32 that at least partially covers the outer peripheral surface 31 a of the core 31 .
  • the refractive index of the coating layer 32 is set substantially equal to or higher than the refractive index of the core 31 .
  • the coating layer 32 also contains scattering elements 33d such as particles and voids. In this case, light reaching the interface between the core 31 and the coating layer 32 enters the coating layer 32, is scattered by the scattering elements 33d, and leaks radially outward.
  • the coating layer 32 by providing the coating layer 32, it is possible to appropriately set or change the location where light leaks, the location where light leaks easily, or the location where the intensity of leaked light increases. You get the advantage of being able to Further, when the core 31 is appropriately pressurized radially inward by the coating layer 32, light tends to leak from the pressurized portion.
  • FIGS. 10 to 14 may be combined as appropriate in the optical fiber 30 and implemented.
  • FIG. 15 is a cross-sectional view showing an example of the configuration of the leakage portion 11.
  • the leak portion 11 has a shielding member 50 .
  • the shielding member 50 is provided for each of the optical fibers 30 positioned deviated from the central axis Ax1 of the irradiation probe 10 in the radial direction D1 to D3 (hereinafter referred to as the eccentric direction) so that the leaked light from the optical fiber 30 is blocked. It blocks the direction opposite to the eccentric direction and the circumferential direction of the irradiation probe 10 .
  • leaked light with high directivity is output from each optical fiber 30 in the radial directions D1 to D3, which are the respective eccentric directions.
  • some of the leaked light is output in directions other than the radial directions D1-D3, ie, directions different from the intended directions.
  • Such light in a direction different from the intended direction causes a decrease in the directivity of the irradiation probe 10, causing the light to reach, for example, a region in the living body that originally does not need or should not be irradiated with light. is wasted.
  • the shielding member 50 suppresses leakage light (irradiation light) from the irradiation probe 10 from being output in directions other than the intended direction (radial directions D1 to D3). Therefore, it is possible to suppress the deterioration of the directivity of the irradiation probe 10, and to prevent the light from being unnecessarily irradiated, for example, to a region in the living body which originally does not need or should not be irradiated with the light. can be suppressed.
  • the shielding member 50 has multiple plates 51 .
  • Each of the plates 51 radially extends from the central axis Ax1 so as to pass between the two optical fibers 30 . That is, the plate 51 is located between the two optical fibers 30 in the circumferential direction of the irradiation probe 10 .
  • the plurality of plates 51 are connected and integrated with each other on or near the central axis Ax1, that is, on the inner side of the irradiation probe 10 in the radial direction.
  • two plates 51 are positioned opposite to the eccentric direction of each optical fiber 30 and positioned on both sides of the optical fiber 30 in the circumferential direction. With such a configuration, leakage light from the optical fiber 30 is blocked from traveling in the direction opposite to the eccentric direction and in the circumferential direction of the irradiation probe 10 .
  • the plate 51 is an example of an intermediate portion and an example of an extension portion.
  • the shielding member 50 includes, for example, a metal member and shields light leaking from the optical fiber 30 .
  • the shielding member 50 may be made entirely of a metallic material, such as a copper-based material. As a result, heat dissipation in the leaking portion 11 can be enhanced, and an increase in temperature of the leaking portion 11 can be suppressed.
  • the shielding member 50 is an example of a metal member.
  • the shielding member 50 may have a core member, such as a synthetic resin material, whose elastic modulus is smaller than that of a metal material, and a coating made of a metal material that covers the surface of the core member.
  • the shielding member 50 and the leakage portion 11 can be configured more flexibly.
  • the coating is an example of a metal member.
  • the shielding member 50 may reflect leaked light.
  • the shielding member 50 reflects leaked light traveling in a direction different from the intended direction to a direction close to the intended direction, thereby improving the directivity of the irradiation probe 10 .
  • the shielding member 50 is an example of a reflecting member.
  • FIG. 16 is a cross-sectional view showing an example of the configuration of the leakage portion 11.
  • the scattering region 33 was located radially outside the irradiation probe 10 in each optical fiber 30, whereas in the example of FIG. It is positioned radially inside the irradiation probe 10 .
  • the scattering region 33 in the case of FIG. 15 is an example of the inner scattering portion
  • the scattering region 33 in the case of FIG. 16 is an example of the outer scattering portion.
  • the intensity distribution of the leaked light in the circumferential direction of the optical fiber 30 is such that the intensity of the leaked light directed radially outward of the irradiation probe 10 in the posture shown in FIG. and the intensity of the leaked light toward the inner side in the radial direction of the irradiation probe 10 have directivity in which the intensity of the leaked light toward the other directions is higher.
  • the optical fibers 30 extend in two directions: radial directions D1 to D3 (eccentric direction, radially outward) and the direction opposite to the eccentric direction (radial inward). It has highly directional leakage light radiation characteristics.
  • the shielding member 50 is an example of a reflecting member and is configured to reflect leaked light.
  • part of the light (scattered light) that has traveled radially outward of the irradiation probe 10 in the scattering region 33 is transferred to the surface of the optical fiber 30 on the opposite side of the scattering region 33 (hereinafter referred to as facing (referred to as a surface) are totally reflected and remain in the optical fiber 30 .
  • another part of the light directed radially outward of the irradiation probe 10 in the scattering region 33 does not satisfy the total reflection condition on the opposing surface, leaks out of the optical fiber 30 from the opposing surface, and D3 or a direction close to the radial direction D1 to D3.
  • part of the light (scattered light) directed radially inward of the irradiation probe 10 in the scattering region 33 is reflected by the shielding member 50 and travels in the radial direction D1 to D3 or a direction close to the radial direction D1 to D3.
  • another part of the scattered light directed radially inward of the irradiation probe 10 in the scattering region 33 enters the optical fiber 30 again, and on the opposite surface, the light remaining in the optical fiber 30 and the light from the opposite surface It is divided into light emitted in the radial directions D1 to D3 or in directions close to the radial directions D1 to D3.
  • most of the scattered light from the scattering region 33 including the light reflected by the shielding member 50 and input to the optical fiber 30 again, is output to the outside of the leaking portion 11 via the opposing surface.
  • the opposing surface light that does not satisfy the total reflection condition, that is, light that has a small inclination angle with respect to the radial directions D1 to D3 selectively leaks out of the optical fiber 30 . Therefore, according to the configuration in which the scattering region 33 in each optical fiber 30 is located inside the irradiation probe 10 in the radial direction as in the examples of FIGS.
  • the directivity of the irradiation probe 10 in the radial directions D1 to D3 is higher than in the configuration positioned inside.
  • FIG. 17 is an enlarged view of part of the modification of FIG.
  • the average radius of curvature of the scattering regions 33 is the same as the radius of the general region of the outer peripheral surface 30a of the optical fiber 30 where the scattering regions 33 are not formed.
  • the outer peripheral surface 30a is a convex curved surface.
  • FIG. 18 shows another modified example in which the shape of the scattering region 33 is changed with respect to the example of FIG.
  • the average radius of curvature of the outer peripheral surface 30a in the scattering region 33 is greater than or equal to the radius of the general region of the outer peripheral surface 30a of the optical fiber 30 where the scattering region 33 is not formed.
  • the outer peripheral surface 30a is a convex curved surface.
  • FIG. 19 shows another modified example in which the shape of the scattering region 33 is changed with respect to the example of FIG.
  • the outer peripheral surface 30 a in the scattering region 33 is a plane that intersects the radial direction of the optical fiber 30 .
  • FIG. 20 shows another modified example in which the shape of the scattering region 33 is changed with respect to the example of FIG.
  • the outer peripheral surface 30 a of the scattering region 33 is a concave curved surface that is concave radially inward of the optical fiber 30 .
  • the branching ratio can be increased compared to the case where the radius of curvature of the surface 30a is the same as the radius of the general area. 19 and 20, when the outer peripheral surface 30a of the scattering region 33 is flat or concavely curved, the radius of curvature of the outer peripheral surface 30a of the scattering region 33 is the same as the radius of the general region. It was found that the branching ratio can be made smaller than in the case.
  • the magnitude of the branching ratio can be adjusted by adjusting various specifications of the scattering region 33 such as the radius of curvature and the length of the scattering region 33 in the circumferential direction. As a result, for example, the effect of increasing the degree of freedom in designing the irradiation probe 10 can be obtained.
  • the scattering elements in the scattering region 33 are concave portions 33a (see FIG. 3) or convex portions provided on the outer peripheral surface 30a, and particles 33b (see FIG. 10) provided inside and near the outer peripheral surface 30a. (see FIG. 11) or holes 33c (see FIG. 11).
  • the outer peripheral surface 30a of the optical fiber 30 is masked except for the portion where the scattering region 33 is to be formed, and the unmasked opening portion is sandblasted.
  • the concave portion 33a and the convex portion can be formed by applying a process for forming an uneven surface such as the above.
  • the shape and radius of curvature of the scattering region 33 can be appropriately adjusted by performing masking in multiple stages or by adjusting the irradiation time depending on the irradiation direction of sandblasting.
  • FIG. 21 shows another modified example in which the shape of the scattering region 33 is changed with respect to the example of FIG.
  • the scattering region 33 is formed as a covering layer 32 as shown in FIG.
  • the coating layer 32 can be configured as part of a thin clad layer. Even with such a configuration, the same actions and effects as in the examples of FIGS. 15 to 20 can be obtained.
  • FIG. 22 is a cross-sectional view of a modified example in which the directivity of leaked light from the optical fiber 30 is lowered with respect to the examples of FIGS.
  • the optical fiber 30 does not have the scattering region 33 only in a specific portion in the circumferential direction, but substantially uniformly over the entire cross section, or the outer peripheral surface 30a or the region near the outer peripheral surface 30a.
  • a scattering element is provided on, or throughout. In this case, the intensity distribution of the leaked light in the circumferential direction of the optical fiber 30 becomes a relatively flat distribution without a specific peak in the radial direction.
  • the shielding member 50 as a reflecting member, light reflected from the shielding member 50, including light reflected by the shielding member 50, is emitted from the irradiation probe 10 in the eccentric direction (radial direction D1 to D3) of the optical fiber 30. Leakage light (irradiation light) with relatively high directivity is output.
  • the plurality of plates 51 may be separated from each other. In this case, the boundaries between the plates 51 may be covered with another shielding member (not shown).
  • FIG. 23 is a cross-sectional view showing an example of the configuration of the leakage portion 11.
  • the shielding member 50 has multiple dummy fibers 52 .
  • the plurality of dummy fibers 52 includes a dummy fiber 52 positioned at the cross-sectional center of the irradiation probe 10 and a dummy fiber 52 positioned between the two optical fibers 30 .
  • the optical fibers 30 and the dummy fibers 52 are alternately arranged in the circumferential direction around the dummy fiber 52 positioned at the center of the cross section.
  • the dummy fiber 52 contains, for example, a metal member, and shields light leaking from the optical fiber 30 .
  • dummy fibers 52 are arranged radially inside and on both circumferential sides of the irradiation probe 10 with respect to each optical fiber 30 . Therefore, according to the example of FIG. 23, a plurality of dummy fibers 52 can function as shielding member 50 .
  • the dummy fiber 52 is an example of an opaque fiber that does not transmit leaked light, and is an example of a first opaque fiber.
  • the dummy fiber 52 may be made of a conductive metal material such as a copper-based material.
  • the dummy fiber 52 can be used as a conductor for power or electrical signals.
  • the dummy fiber 52 may have an insulating coating.
  • the dummy fiber 52 may be a reflecting member that reflects the leaked light from the optical fiber 30 .
  • the dummy fiber 52 may be made of a highly reflective synthetic resin material such as polytetrafluoroethylene (PTFE).
  • FIG. 24 is a cross-sectional view showing an example of the configuration of the leakage portion 11.
  • the dummy fiber 52 was entirely made of a metal member, whereas in the example of FIG. It has a small core member 52a and a covering 52b made of a metallic material covering the surface of the core member.
  • the shielding member 50 and the leakage portion 11 can be configured more flexibly.
  • the coating 52b is an example of a metal member.
  • FIG. 25 is a cross-sectional view showing an example of the configuration of the leakage portion 11.
  • a dummy fiber 53 is added as the shielding member 50 to the example of FIG.
  • the dummy fiber 53 contains, for example, a metal member and shields light leaking from the optical fiber 30 .
  • the dummy fiber 53 has the same diameter as or different from that of the dummy fiber 52, and is thinner than the dummy fiber 52 as an example, and the optical fiber 30 has a diameter corresponding to the boundary between the two dummy fibers 52 adjacent to each other. It is located on the near side and covers the boundary with respect to the optical fiber 30 .
  • the dummy fiber 53 is an example of an opaque fiber and an example of a second opaque fiber.
  • leakage light from the optical fiber 30 can be suppressed from traveling in a direction different from the intended direction (radial directions D1 to D3) through the boundary between the two dummy fibers 52. can.
  • the dummy fiber 52 may be a reflecting member that reflects the leaked light from the optical fiber 30 . Also, the dummy fiber 52 may be a dummy fiber 52 that does not have the core member 52a and the coating 52b as in the example of FIG.
  • FIG. 26 is a cross-sectional view showing an example of the configuration of the leakage portion 11.
  • the leakage unit 11 has the same configuration as in the example of FIG.
  • the number of optical fibers 30 is six, which is more than in the example of FIG.
  • the shielding member 50 has a dummy fiber 52C located at the center of the cross section and dummy fibers 52 alternately arranged along the outer periphery of the dummy fiber 52C together with the optical fiber 30 .
  • the diameter of the dummy fiber 52C is larger than the diameters of the optical fiber 30 and the dummy fiber 52, and the diameter of the dummy fiber 52 is substantially the same as the diameter of the optical fiber 30.
  • the dummy fiber 52 ⁇ /b>C is an example of a core wire extending in the longitudinal direction of the irradiation probe 10 .
  • the dummy fiber 52C located at the center of the cross section can function as a supporting member for the plurality of optical fibers 30 and the dummy fiber 52 lined up on the outer periphery or as a guide during manufacturing.
  • the diameter of the dummy fiber 52C is larger than the diameter of the optical fiber 30, it is possible to block leaked light from each optical fiber 30 toward the side opposite to the radial directions D1 to D6 more reliably.
  • the dummy fiber 52C and the dummy fiber 52 may be reflecting members that reflect the leaked light from the optical fiber 30.
  • FIG. 27 is a cross-sectional view showing an example of the configuration of the leakage portion 11.
  • the shielding member 50 is formed with a recess 54 a that at least partially accommodates the optical fiber 30 .
  • the concave portion 54a can be formed, for example, by pressing the optical fiber 30 or a member other than the optical fiber 30 radially inward during manufacturing.
  • the shielding member 50 including the concave portion 54a may be molded by extrusion molding or the like.
  • at least part of the shielding member 50 may be made of a relatively flexible material having a lower elastic modulus than metal material, such as synthetic resin material.
  • Protrusions 54 are provided on both sides of the recess 54a. Each protrusion 54 is positioned between two optical fibers 30 in the circumferential direction of the irradiation probe 10 .
  • the projecting portion 54 is an example of an intervening portion.
  • the plurality of protruding portions 54 are connected and integrated with each other on or near the central axis Ax1, that is, on the inner side in the radial direction of the irradiation probe 10 . Therefore, in the example of FIG. 27 as well, actions and effects similar to those of FIGS. 15 and 16 are obtained.
  • the shielding member 50 may be a reflecting member that reflects leaked light from the optical fiber 30 .
  • the concave portion 54a and the optical fiber 30 are in surface contact, and the concave portion and the convex portion (not shown) are provided in the concave portion 54a.
  • a convex portion or concave portion may be formed along the shape of 54a.
  • the scattering region 33 can be formed in contact with the concave portion 54a on the outer peripheral surface 30a.
  • the shielding member 50 is an example of a core wire, and the concave portions and convex portions provided in the concave portion 54a are an example of scatterers.
  • FIG. 28 is a cross-sectional view of one optical fiber 30 in the leakage portion 11.
  • the shielding member 50 is configured as a sleeve 55 that partially covers the periphery of the optical fiber 30 and extends in the longitudinal direction at the leakage portion 11 .
  • the sleeve 55 is provided with a slit-like opening 50a that opens in the radial direction D1 and extends in the longitudinal direction. Even with such a configuration, the sleeve 55 is positioned between the two optical fibers 30 in the circumferential direction and radially inside the irradiation probe 10 with respect to the optical fibers 30 .
  • the sleeve 55 can block leakage light from the optical fiber 30 from traveling in the direction opposite to the radial direction D ⁇ b>1 and in the circumferential direction of the irradiation probe 10 .
  • the sleeve 55 may be a reflecting member that reflects the leaked light from the optical fiber 30 .
  • Figures 29 and 30 are side views of variations of the end portion 10b of the illumination probe 10 having a plurality (three in this example) of dummy fibers 52 like the example of Figures 23-25.
  • FIG. 29 and FIG. 30 differ in the rotational attitude of the irradiation probe 10 around the central axis Ax1.
  • the dummy fiber 52 includes a metal member, and when projected light such as X-rays is irradiated from the side along the radial direction, the two-dot chain line in FIGS. Such projection image Im can be obtained.
  • the positions and shapes of the ends 52-1 to 52-3 of the dummy fiber 52 in the longitudinal direction are set so that the rotational posture of the irradiation probe 10 about the central axis Ax1 can be determined from the projected image Im. .
  • the end portions 52-1 to 52-3 of these dummy fibers 52 are examples of projected portions.
  • At least two portions to be projected are separated from each other in the longitudinal direction of the irradiation probe 10 and separated from each other in the circumferential direction of the irradiation probe 10 with a central angle different from 0° or 180° when viewed in the longitudinal direction. If there is a part, the projection shape of the projected part will change according to the rotational posture. If the central angles are 0° and 180°, the width of the projection shape becomes too narrow for both of these two parts, and there is a possibility that a rotation posture in which the projection shape cannot be obtained is generated, so they are excluded.
  • the ends 52-1 to 52-3 of the three dummy fibers 52 are separated from each other in the X direction (longitudinal direction). Further, as shown in FIGS. 23 to 25, the three dummy fibers 52 are radially spaced apart from the central axis Ax1, and when viewed in the longitudinal direction, are circumferentially spaced apart from each other at a central angle of 120°. separated from each other. Therefore, in the examples of FIGS. 29 and 30, two of the end portions 52-1 to 52-3 are an example of two portions that produce the action and effect that the rotational posture can be determined by lateral projection. .
  • each of the dummy fibers 52 is provided with an annular coating 56 made of a metal member or the like that covers the outer periphery.
  • the dummy fiber 52 is transparent to projection light, such as X-rays, and the coating 56 is opaque to projection light. In this case, projection images Im can be obtained for these multiple coverings 56 .
  • the arrangement of the plurality of coatings 56 is set so that the rotational posture of the irradiation probe 10 about the central axis Ax1 can be determined from the projection image Im when projection light is irradiated from the side along the radial direction.
  • the coating 56 is an example of a projected portion. Coating 56 may also be referred to as a marker.
  • the coatings 56 provided on the ends 52-1 to 52-3 of the three dummy fibers 52 are separated from each other in the X direction (longitudinal direction).
  • the coatings 56 provided on the three dummy fibers 52 are radially spaced apart from the central axis Ax1 and, as shown on the right side of FIGS. are spaced apart from each other in the circumferential direction. Therefore, in the example of FIGS. 31 and 32, two of the three coverings 56 are an example of two parts that have the action and effect of being able to discriminate the rotational posture by lateral projection.
  • different projection images Im are obtained according to the rotational orientations, including the rotational orientations different from those shown in FIGS.
  • the coatings 56 can be arranged at predetermined intervals in the longitudinal direction. Therefore, the curved state of the irradiation probe 10 can also be grasped from the arrangement of the coating 56 .
  • the covering 56 may be distributed over a longer section of the leaking portion 11 than only the end portion 10b.
  • FIG. 33 and 34 are a side view (left side) and a front view (right side) of a modification of the end portion 10b of the illumination probe 10 having a dummy fiber 52 passing through the central axis Ax1 as in the examples of FIGS. 23-26. .
  • FIG. 33 and FIG. 34 differ in the rotational attitude of the irradiation probe 10 around the central axis Ax1.
  • the dummy fibers 52 are respectively provided with markers 57-1 and 57-2 made of a metal member or the like on the outer periphery.
  • the dummy fiber 52 is transparent to projection light such as X-rays, and the markers 57-1 and 57-2 are opaque to projection light.
  • projection images Im can be obtained for these markers 57-1 and 57-2.
  • the plurality of markers 57-1 and 57-2 are arranged so that the rotational posture of the irradiation probe 10 about the central axis Ax1 can be determined from the projection image Im when the projection light is irradiated from the side along the radial direction. is set.
  • the markers 57-1 and 57-2 are examples of projected portions.
  • the two markers 57-1 and 57-2 provided on the dummy fiber 52 are separated from each other in the X direction (longitudinal direction).
  • the two markers 57-1 and 57-2 are separated from the central axis Ax1 in the radial direction, and as shown on the right side of FIGS. are circumferentially spaced from each other with a central angle of Therefore, in the examples of FIGS. 33 and 34, the two markers 57-1 and 57-2 are an example of two parts that have the action and effect of being able to determine the rotational posture by lateral projection.
  • different projection images Im are obtained according to the rotational orientations, including the rotational orientations different from those shown in FIGS. Therefore, according to the examples of FIGS. 33 and 34, it is possible to detect the rotational posture of the irradiation probe 10 relatively easily and accurately using the dummy fiber 52 and the markers 57-1 and 57-2.
  • the two portions on the markers 57-1 and 57-2 that are separated from each other are also separated from each other in the longitudinal direction and irradiated with a central angle different from 0° or 180° when viewed in the longitudinal direction. Since they are spaced apart from each other in the circumferential direction of the probe 10, they can serve as an example of two parts that have the action and effect of being able to determine the rotational posture by lateral projection.
  • FIGS. 29 to 34 are merely examples, and the two parts and the projected part can be implemented in various forms.
  • the two parts and the projected part can be provided on the shielding member 50 such as the plate 51 other than the dummy fiber 52, the optical fiber 30, the coating 13, etc., and the shape of the two parts and the projected part , arrangement, etc. can be set variously.
  • the irradiation probe may include both a reflective member and a non-reflective shielding member.
  • the present invention can be used for irradiation probes and irradiation probe systems.
  • Irradiation probe system 10 Irradiation probe 10a... End 10b... End 10c... Outer peripheral surface 11... Leakage part 12... Transmission part 13... Coating 20... Delivery optical fiber 30, 30-1, 30-2, 30-3 Optical fiber 30a Outer peripheral surface 31 Core 31a Outer peripheral surface 32 Coating layer 33 Scattering region (outer scattering portion, inner scattering portion) 33a... Concave portion 33b... Particle 33c... Hole 33d... Scattering element 40... Switching mechanism 40a... Movable parts 40b-1, 40b-3... Mirror 50... Shielding member (metal member, projected part) 50a... Opening 51...
  • Control device (control mechanism, switching mechanism) Reference numeral 210: controller 211: irradiation control unit 212: input control unit 213: output control unit 214: switching control unit 220: input unit 230: output unit 241: main storage unit 242: auxiliary storage device Ax1: central axis Ax2: central axis D1 ⁇ D6...Radial direction (irradiation probe) Df...Radial direction (optical fiber) Im...Projected image X...Direction Y...Direction

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