WO2023176961A1 - Pièce à main laser - Google Patents

Pièce à main laser Download PDF

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Publication number
WO2023176961A1
WO2023176961A1 PCT/JP2023/010587 JP2023010587W WO2023176961A1 WO 2023176961 A1 WO2023176961 A1 WO 2023176961A1 JP 2023010587 W JP2023010587 W JP 2023010587W WO 2023176961 A1 WO2023176961 A1 WO 2023176961A1
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Prior art keywords
laser
laser light
wavelength conversion
wavelength
light guide
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PCT/JP2023/010587
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English (en)
Japanese (ja)
Inventor
孝藏 玉置
京樹 中島
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株式会社アパタイト
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Publication of WO2023176961A1 publication Critical patent/WO2023176961A1/fr

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    • 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
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C3/00—Dental tools or instruments
    • A61C3/02—Tooth drilling or cutting instruments; Instruments acting like a sandblast machine

Definitions

  • the present invention relates to a laser handpiece, and particularly to a laser handpiece used, for example, in dentistry.
  • lasers have been used in the medical field, etc.
  • Lasers are broadly classified by type into solid lasers, gas lasers, liquid lasers, and semiconductor lasers.
  • the lasers mainly used in the dental medical field are carbon dioxide laser, Nd:YAG laser, semiconductor laser, and Er:YAG laser.
  • Semiconductor lasers are used as medical lasers in the wavelength range of 400 nm to 10,600 nm, are generally tissue penetrating, have high heat absorption into red blood cells, and under low output power do not activate cells. It is expected to be used as a soft tissue laser.
  • the Er:YAG laser has a center wavelength of 2940 nm and is a laser that uses water and can be used for both soft and hard tissues.
  • the Er:YAG laser has a strong power to excite water molecules and cause a vapor explosion, and this ability is used as a laser for cutting teeth, gums, bones, etc.
  • This dental treatment device includes a first light source that outputs first light having a center wavelength within a wavelength range of 400 nm to 410 nm, and inputs the first light output from the first light source into an input end. an optical waveguide that guides the wave, outputs the guided first light from the output end, and irradiates the treatment area with the output first light; and an analysis that analyzes the light received by the light receiving section. and display means for displaying the analysis results analyzed by the analysis means.
  • an irradiation device using an Er:YAG laser as a solid laser for medical treatment and dental treatment is disclosed (see Patent Document 2).
  • the illumination device is configured such that its elongate body includes two or more optical fibers to transmit electromagnetic energy from a power source toward a target surface.
  • the distal end of the illumination device is illustrated as a unitary structure, and the proximal end is illustrated as comprising multiple proximal end members.
  • the irradiation device includes two or more optical fibers that transmit energy toward a distal end and at least one optical fiber that transmits energy from the distal end to the proximal end of the device.
  • the dental treatment apparatus described in Patent Document 1 can only perform treatment corresponding to a wavelength having a center wavelength within a predetermined wavelength range, and the applications of the treatment are limited.
  • the main object of the present invention is to provide a wavelength conversion member that can easily convert and amplify the wavelength of the laser beam outputted from the laser generating section to a wavelength different from that of the laser beam outputted from the laser generating section, even in a low-power laser generating section.
  • the purpose of the present invention is to provide a laser handpiece with the following features.
  • a laser handpiece includes a cylindrical main body portion to which a laser light guide for transmitting laser light from a laser generator is attached, and the main body includes a laser guide.
  • An amplification section having a wavelength conversion member for irradiating the treatment site with laser light transmitted by the light body, and a treatment site irradiation section for irradiating the treatment site with the laser light irradiated from the amplification section are arranged.
  • the wavelength conversion member has a base material, and the wavelength conversion substance is doped into the base material, so that the wavelength conversion substance is diffused and arranged.
  • the amplification When the laser light is incident on the amplification section, the amplification
  • the laser handpiece is characterized in that a Raman effect based on a wavelength conversion substance is generated to output Raman scattered light whose wavelength is converted to a wavelength including the wavelength of a laser beam.
  • the laser handpiece according to the present invention is arranged between the laser light guide and the wavelength conversion member, It is preferable to include a condensing lens for condensing the laser light from the laser light guide at a focal position.
  • the wavelength conversion member has a lens-like shape.
  • the laser handpiece according to the present invention is arranged between the laser light guide and the wavelength conversion member, and reflects Stokes light having a wavelength converted to a wavelength different from the wavelength of the laser light generated by the Raman effect. It is preferable to include a functional half mirror section. Furthermore, it is preferable that the laser handpiece according to the present invention has a connecting part for detachably attaching the laser light guide to the laser handpiece in the middle part of the laser light guide. Further, in the laser handpiece according to the present invention, it is preferable that the connecting portion is disposed in the main body portion.
  • the treatment site irradiation section includes a flat base member, an irradiation member disposed on one side of the base member, and for outputting Stokes light irradiated from the amplification section; It is preferable to have. Moreover, it is preferable that the laser handpiece according to the present invention has a reflection part for reflecting the laser light irradiated from the laser light guide. Furthermore, it is preferable that the laser handpiece according to the present invention has a reflection part for reflecting the focused laser light. Further, in the laser handpiece according to the present invention, it is preferable that the reflecting section is a pentaprism or an octaprism.
  • the laser handpiece according to the present invention has a Q-switch element, and the Q-switch element is disposed between the laser light guide and the amplifying section.
  • the laser handpiece according to the present invention includes a cylindrical main body portion to which a laser light guide for transmitting laser light from a laser generating section is attached, and a cylindrical body portion that amplifies the laser light transmitted by the laser light guide. and a laser probe including a treatment area irradiation unit for irradiating the treatment area with the laser light irradiated from the amplification unit, and the amplification unit includes a laser light guide.
  • a condensing lens for condensing the laser light from the condensing lens to a focal position; a wavelength conversion member for irradiating the treatment area with the laser light transmitted through the condensing lens; It has a sapphire part that resonates and amplifies Stokes light, and a protective filter that transmits the resonated laser light and reflects and scatters the reflected light from the treatment area.
  • the wavelength conversion member has a base material, and the base material is doped with a wavelength conversion substance, so that the wavelength conversion substance is diffused and arranged, and when the laser light is incident on the amplification part, the wavelength conversion material is doped.
  • the laser handpiece is characterized in that a Raman effect based on a wavelength conversion substance occurs in the laser handpiece, thereby outputting Raman scattered light whose wavelength is converted to a wavelength including the wavelength of a laser beam.
  • a Raman effect based on a wavelength conversion substance occurs in the laser handpiece, thereby outputting Raman scattered light whose wavelength is converted to a wavelength including the wavelength of a laser beam.
  • the material of the base material of the wavelength conversion member contains zirconia oxide.
  • the wavelength conversion substance has an average particle size of 1 nm or more and 30 nm or less.
  • the doping rate of the wavelength conversion substance is preferably 0.1% or more and 30% or less.
  • the wavelength conversion substance to be doped is titanium oxide.
  • the titanium oxide is titanium oxide (TiO 2 ).
  • a wavelength conversion member that can easily convert and amplify a wavelength including the wavelength of the laser light outputted from the laser generator even in a low-output laser generator is provided.
  • FIG. 3 is a cross-sectional view of the laser handpiece.
  • 1 is an external perspective view of a treatment site irradiation unit according to a first embodiment of the present invention.
  • FIG. It is a sectional view of the laser handpiece concerning the 1st modification of the 1st embodiment of this invention.
  • FIG. 7 is a sectional view of a laser handpiece according to a second modification of the first embodiment of the invention.
  • a laser irradiation device including a laser handpiece according to a third modification of the first embodiment of the present invention (a) is a configuration diagram of the laser irradiation device including an external view of the laser handpiece, (b) is a sectional view of the laser handpiece.
  • a laser irradiation device including a laser handpiece according to a fourth modification of the first embodiment of the present invention (a) is a configuration diagram of the laser irradiation device including an external view of the laser handpiece, (b) is a sectional view of the laser handpiece.
  • a laser irradiation device including a laser handpiece according to a second embodiment of the present invention (a) is a configuration diagram of the laser irradiation device including an external view of the laser handpiece, and (b) is a configuration diagram of the laser irradiation device including an external view of the laser handpiece.
  • FIG. 3 is a cross-sectional view of the handpiece.
  • FIG. 7 is a sectional view of a laser handpiece according to a first modification of the second embodiment of the invention.
  • FIG. 7 is a sectional view of a laser handpiece according to a second modification of the second embodiment of the invention.
  • a laser irradiation device including a laser handpiece according to a third modification of the second embodiment of the present invention in which (a) is a configuration diagram of the laser irradiation device including an external view of the laser handpiece; (b) is a sectional view of the laser handpiece.
  • a laser irradiation device equipped with a laser handpiece according to a fourth modification of the second embodiment of the present invention (a) is a configuration diagram of the laser irradiation device including an external view of the laser handpiece, (b) is a sectional view of the laser handpiece.
  • FIG. 3 is a cross-sectional view of a laser handpiece according to a third embodiment of the present invention, in which (a) shows a state in which the laser probe is housed in the main body, and (b) shows a state in which the laser probe is extracted from the main body. Indicates the state in which The amplification section of the laser handpiece according to the third embodiment of the present invention, in which (a) shows the structure of one example of the amplification section, and (b) shows the structure of another example of the amplification section.
  • FIG. 7 is a cross-sectional view of a laser handpiece according to a modification of the third embodiment of the present invention, in which (a) shows a state in which the laser probe is housed in the main body, and (b) shows a state in which the laser probe is removed from the main body. Indicates the extracted state.
  • FIG. 1 shows a laser irradiation device equipped with a laser handpiece according to a first embodiment of the present invention, in which (a) is a configuration diagram of the laser irradiation device including an external view of the laser handpiece, and (b) ) is a cross-sectional view of the laser handpiece.
  • FIG. 2 is an external perspective view of the treatment site irradiation unit according to the first embodiment of the present invention.
  • the laser irradiation device 1 includes a control device 70 including a laser handpiece 10A and a laser generator 72, as shown in FIG. 1(a).
  • the laser emitted from the laser generator 72 is transmitted to the laser handpiece 10A via the laser light guides 74 and 22b.
  • the laser handpiece 10A includes a cylindrical main body portion 12, as shown in FIG. 1(b).
  • the laser handpiece 10A includes a condensing lens 26 for condensing the laser light from the laser light guide 22 to a focal position, and a wavelength for irradiating the treatment area with the laser beam condensed by the condensing lens 26. and an amplification section 30 having a conversion member 32.
  • a treatment site irradiation section 40 may be disposed in the amplification section 30 in order to efficiently irradiate the treatment site with laser light.
  • the main body part 12 has a storage part 18.
  • the rear end portion 14 into which the laser light guide 22 is inserted and attached is arranged at the rear end side of the storage portion 18 , and the laser beam transmitted from the laser light guide 22 is placed at the front end side of the storage portion 18 .
  • a front end portion 16 is disposed for ejecting the liquid toward the treatment site and for providing an amplifying portion 30 therein.
  • the laser hand piece 10A has a connecting part 20 in the middle part of the laser light guide 22 for detachably attaching the laser light guide 22 to the laser hand piece 10A.
  • the connecting portion 20 is preferably arranged at the rear end portion 14 of the main body portion 12 .
  • the connecting portion 20 includes a first connecting portion 20a and a second connecting portion 20b.
  • the connecting portion 20 can be separated into a first connecting portion 20a and a second connecting portion 20b.
  • the laser light guide 22 is separated into a laser light guide 22a connected to the first connection part 20a and a laser light guide 22b connected to the second connection part 20b.
  • the first connecting portion 20a is arranged on the storage side of the rear end portion 14 of the storage portion 18.
  • the laser light guide 22 includes a core portion 23 for guiding laser light, a cladding 24 placed around the core portion 23, and a covering layer 25 placed around the cladding 24.
  • the core portion 23, the cladding 24, and the covering layer 25 are arranged concentrically.
  • the core portion 23 is made of a material having a high refractive index, such as quartz containing Si (SiO 2 ).
  • the cladding 24 is formed of a material such as quartz or resin, and has a refractive index lower than that of the core portion 23 by about 0.2% or more and 1% or less.
  • the covering layer 25 is formed of a resin material such as a fluororesin, and protects the core portion 23 and the cladding 24 .
  • the core portion 23 is made of quartz (SiO 2 )
  • the cladding 24 is made of a hard resin material
  • the covering layer 25 is made of a resin material containing fluorine.
  • the core portion 23 according to this embodiment may be formed hollow.
  • the core portion 23 in this embodiment is formed of quartz (SiO 2 ), it is not limited to this, and for example, zirconia or sapphire may be used.
  • the covering layer 25 may be formed of fluoride glass containing metal.
  • the storage section 18 of the laser handpiece 10A includes a condensing lens 26 that is irradiated with the laser light transmitted from the laser light guide 22, and a guide member 27 for guiding the laser light guide 22a.
  • the condensing lens 26 has a function of condensing the laser light transmitted from the laser light guide 22 to a focal position.
  • a protective glass 26a is placed between the laser light guide 22 and the condenser lens 26 to protect the laser light transmitted from the laser light guide 22 from directly entering the condenser lens 26. Placed. It is preferable that the diameter of the condenser lens 26 is approximately the same as the diameter of the laser light guide 22.
  • the guide member 27 is provided to guide the laser light guide 22 inserted through the connecting portion 20 at the rear end portion 14 of the storage portion 18 .
  • the guide member 27 is formed in a cylindrical shape.
  • a guide hole 27a for guiding and holding the laser light guide 22 is formed in the central axis of the guide member 27.
  • the guide member 27 is fixed in contact with the inner wall surface of the storage portion 18 and is disposed within the storage portion 18 .
  • An amplification section 30 is arranged at the front end section 16 of the main body section 12.
  • the amplification unit 30 is provided to irradiate the treatment site with the laser light focused by the condenser lens 26.
  • the amplifying section 30 is arranged so as to protrude from the front end section 16 of the main body section 12 . More specifically, the amplification section 30 is installed by being screwed or fitted into the opening 16a provided in the front end 16 of the main body section 12. The amplifying section 30 can be removed from the main body section 12.
  • the amplification section 30 includes a wavelength conversion member 32 and a cover member 34 for protecting the wavelength conversion member 32.
  • the wavelength conversion member 32 has a base material 32a.
  • the wavelength converting substance is doped into the base material 32a, so that the wavelength converting substance is diffused and arranged. That is, the base material 32a is formed of, for example, zirconia oxide, and the wavelength converting substance is diffused and arranged inside the base material 32a. Note that when the wavelength conversion substance is doped with a mixture in which carbon, iron oxide, iron dioxide, copper, zinc, chromium, silver, potassium, yttrium, germanium, silicon, etc.
  • the base material 32a is doped with oxidized It is formed of zirconia, and a wavelength converting substance and carbon, iron oxide, iron dioxide, copper, zinc, chromium, silver, potassium, yttrium, germanium, silicon, etc. are diffused and arranged inside it.
  • a Raman effect based on the wavelength conversion substance occurs in the wavelength conversion member 32, so that the laser beam is Stokes light due to Raman scattered light whose wavelength has been converted to a wavelength different from the wavelength is output.
  • the Stokes phenomenon of electrons is expanded to an excitation level by interacting with other atoms.
  • the Stokes phenomenon is a phenomenon caused by the interaction of electrons between two atoms
  • Raman shift and Rayleigh shift occur between related atoms due to the relationship between the electron valence and the number of electrons in the orbit that is insufficient until the number of electrons becomes stable. It is estimated that the mutual influence of can be reflected in the magnitude of the Stokes phenomenon from the photon resonance phenomenon (for more detailed theoretical details, refer to Non-Patent Documents 1 to 6).
  • the wavelength conversion substance for example, titanium oxide or a rare earth laser medium such as Er, Yb, Nd, Bi, or Pr can be used.
  • a rare earth laser medium such as Er, Yb, Nd, Bi, or Pr
  • the particle size of the wavelength conversion substance is set to nano-level in order to ensure a surface area for efficiently producing the Raman effect, and the smaller the particle size, the more preferable.
  • the wavelength conversion material is selected in consideration of the absorption wavelength of water.
  • titanium oxide (TiO 2 ) is preferable as the titanium oxide.
  • the average particle diameter of titanium oxide as a wavelength conversion substance is preferably at the nano level, from 1 nm to 30 nm. Thereby, a surface area for efficiently producing the Raman effect can be secured.
  • the wavelength of Stokes light output by Raman scattered light can be 3000 nm or more.
  • the theory of the wavelength shift to the infrared region due to titanium oxide is disclosed in Non-Patent Document 7 and Non-Patent Document 8.
  • the diameter of the core portion 23 is approximately 200 ⁇ m or more and 1000 ⁇ m or less, and the outer diameter of the cladding 24 is approximately 250 ⁇ m or more and 1050 ⁇ m or less.
  • the wavelength converting member 32 is arranged such that the wavelength converting substance is doped into the base material 32a so that the wavelength converting substance is diffused. That is, the base material 32a is formed of, for example, zirconia oxide, and the wavelength converting substance is diffused and arranged inside the base material 32a. This makes it possible to provide a wavelength conversion member that can easily convert and amplify a wavelength different from the wavelength of the laser light output from the laser irradiation device 1 even in the case of a low-power laser irradiation device 1. can.
  • the doping rate of titanium oxide as a wavelength conversion substance is preferably 0.1% or more and 30% or less. Thereby, the Raman effect can be produced more efficiently.
  • the wavelength conversion member 32 has a doping rate of titanium oxide as a wavelength conversion substance of 0.1% or more and 30% or less, the Raman effect can be produced more efficiently.
  • the wavelength conversion member 32 can be suitably used for treatment when the wavelength of the Stokes light output by the Raman scattered light is 3000 nm or more, which is the absorption wavelength of water.
  • the base material 32a of the wavelength conversion member 32 is formed of a substance having a crystal structure that allows photons to pass therethrough, such as zirconia oxide.
  • the base material 32a may be formed of quartz containing Si ( SiO2 ), sapphire, or diamond.
  • the wavelength conversion member 32 uses titanium oxide as a wavelength conversion substance and further uses titanium oxide (TiO 2 ), it is possible to obtain Stokes light by Raman scattered light generated by the Raman effect in the wavelength range necessary for treatment. I can do it.
  • the wavelength conversion member 32 is preferably formed into a lens-like shape.
  • the cover member 34 for protecting the wavelength conversion member 32 has a cylindrical cover body 36 and a transmission window 38 disposed inside the cover body 36.
  • the cover main body part 36 of the cover member 34 has a first holding part 36a for holding the wavelength conversion member 32 and a second holding part 36b for holding the treatment area irradiation part 40, with the transmission window 38 as a boundary. provided.
  • the outer portion of the first holding portion 36a of the cover main body portion 36 is screwed or fitted into the opening 16a of the front end portion 16 of the laser handpiece, and is mounted. The first holding portion 36a of the cover body portion 36 can then be removed at the opening 16a.
  • the treatment area irradiation unit 40 includes a flat base member 42 and is disposed on one side of the base member 42, and is configured to irradiate the Stokes light irradiated from the amplification unit 30 to the treatment area. It has a member 44 and a cylindrical guide 46 having the irradiation member 44 therein.
  • the base member 42, the irradiation member 44, and the guide 46 are integrally formed.
  • the irradiation member 44 of the treatment site irradiation section 40 is made of, for example, quartz, sapphire, or zirconia.
  • the guide 46 is preferably made of resin or aluminum, for example.
  • the base member 42 of the treatment site irradiation unit 40 is, for example, formed in a disc shape.
  • the base member 42 is fitted into and held by the second holding portion 36b of the cover body portion 36 of the cover member 34.
  • the base member 42 is formed of a member that blocks Stokes light, reflected light, etc., and is formed of, for example, a metal plate or a protective filter.
  • the irradiation member 44 is disposed in the center of the base member 42 so as to penetrate from one side toward the other side.
  • the irradiation member 44 is covered by a guide 46, and is arranged inside the guide 46 so that a part of the irradiation member 44 is exposed at one end side and an exposed portion 44a is located.
  • the irradiation member 44 is made of, for example, rod-shaped glass containing quartz, sapphire, or zirconia.
  • the guide 46 is formed into a cylindrical shape.
  • An irradiation member 44 is arranged inside the guide 46 .
  • the guide 46 is disposed at the center of the base member 42 so as to penetrate from one side toward the other side.
  • the guide 46 is made of resin or aluminum, for example. Thereby, the guide 46 can be bent at the intermediate portion of the guide 46, so that the exposed portion 44a of the irradiation member 44 can be easily directed in a desired direction.
  • the half mirror section 50 is disposed on the other end side (laser light incident side) of the wavelength conversion member 32, and has a function of reflecting Stokes light having a wavelength converted into a wavelength including the wavelength of the laser light generated by the Raman effect.
  • the half mirror section 50 is arranged to reflect the wavelength of 3000 nm.
  • the control device 70 includes a laser generator 72 that emits a laser beam to the laser handpiece 10A, and a controller that transmits the laser beam emitted from the laser generator 72 to the laser handpiece 10A.
  • a laser light guide 74 is provided.
  • the laser generating section 72 emits a laser beam under the control of a control section (not shown), and outputs the laser beam to the laser handpiece 10A via the laser light guide 74.
  • the laser generator 72 When the laser generator 72 operates, a process is performed to emit a laser beam from the laser generator 72, and the laser beam enters from the other end of the laser handpiece 10A via the laser light guide 74 and the laser light guide 22. do. Then, the incident laser beam is transmitted through the condensing lens 26 and acts on the wavelength conversion substance diffused in the wavelength conversion member 32 of the amplification section 30, resulting in the Raman effect, which causes the incident laser beam to change. Stokes light by Raman scattered light whose wavelength has been converted to a wavelength different from the wavelength is outputted from the treatment area irradiation unit 40 to the treatment area.
  • the laser handpiece 10A shown in FIG. 1(b) includes a half mirror section 50 that has a function of reflecting laser light having a wavelength converted to a wavelength different from the wavelength of the laser light generated by the Raman effect. Since the Raman effect occurs in the member 32, it is possible to more efficiently amplify the Stokes light due to the Raman scattered light whose wavelength has been converted to a wavelength different from the wavelength of the laser light. Thereby, this Stokes light can be used equivalently to laser light. Further, the laser handpiece 10A shown in FIG. 1(b) can output a desired laser beam to the treatment area even when the output of the laser beam from the laser generating section 72 is relatively small. Therefore, the laser irradiation device 1 including the laser handpiece 10A can be downsized.
  • FIG. 3 is a sectional view of a laser handpiece according to a first modification of the first embodiment of the invention.
  • the same parts as those in the laser handpiece 10A shown in FIG. 1 the same parts as those in the laser handpiece 10A shown in FIG.
  • a Q-switch element 60 is arranged between the condenser lens 26 and the amplification section 30.
  • the Q-switch element 60 can be activated with respect to the laser light incident from the condensing lens 26 to generate a Q-switch pulse.
  • the laser handpiece 10B according to the first modification of the first embodiment further includes a holding member 43 that holds the treatment site irradiation unit 40.
  • the holding member 43 is formed in a cylindrical shape, has an opening 43a arranged on one side, and has a bottom surface 43b on the other side.
  • a light entrance hole 43c through which the laser light emitted from the laser light guide 22 enters is formed in the center of the bottom surface 43b.
  • a protective glass 26a, a condensing lens 26, and a Q-switch element 60 are arranged in this order from the bottom surface 43b toward the opening 43a.
  • the treatment site irradiation section 40 is arranged so as to be in contact with the opening 43a of the holding member 43.
  • the treatment site irradiation unit 40 is fitted or screwed into an opening 16 a formed in the front end 16 of the main body 12 .
  • the holding member 43 is fitted or screwed into the opening 16 a formed in the front end 16 of the main body 12 .
  • the holding member 43 can be removed at the opening 16a.
  • the laser handpiece 10B shown in FIG. 3 has the same effects as the laser handpiece 10A shown in FIG. 1(b), and also has the following effects. That is, since the Q-switch element 60 is provided between the condenser lens 26 and the amplification section 30, the laser light from the laser light guide 22 is made into a Q-switch pulse and enters the amplification section 30 in a more amplified state. be able to. Therefore, the treatment site can be irradiated with laser light with increased energy density per unit area.
  • FIG. 4 is a sectional view of a laser handpiece according to a second modification of the first embodiment of the invention.
  • the same parts as those in the laser handpiece 10A shown in FIG. 4 the same parts as those in the laser handpiece 10A shown in FIG.
  • the wavelength conversion member 32 of the amplifying section 30 is formed into a lens shape and is arranged in the middle part of the storage section 18 of the main body section 12. Ru.
  • the laser light from the laser light guide 22 enters from the other end side of the irradiation member 44 of the treatment site irradiation unit 40 via the lens-shaped wavelength conversion member 33 formed in the shape of a lens. Therefore, the lenticular wavelength conversion member 33 is adjusted so as to be focused on the other end of the irradiation member 44 of the treatment site irradiation section 40.
  • the lenticular wavelength conversion member 33 has a lenticular base material 33a formed in a lenticular shape.
  • the lenticular base material 33a has a lenticular shape.
  • the lens-shaped base material 33a is doped with a wavelength converting substance, so that the wavelength converting substance is diffused and arranged.
  • a half mirror portion 50 is disposed between the laser light guide 22 and the lens-shaped wavelength conversion member 33. Further, the half mirror section 50 is arranged so as to be in contact with the laser light guide 22. The half mirror section 50 has a function of reflecting Stokes light having a wavelength converted to a wavelength including the wavelength of laser light generated by the Raman effect.
  • the laser handpiece 10C according to the second modification of the first embodiment further includes a holding member 43 that holds the treatment site irradiation unit 40.
  • the holding member 43 is formed in a cylindrical shape, has an opening 43a arranged on one side, and has a bottom surface 43b on the other side.
  • a light entrance hole 43c through which the laser light emitted from the laser light guide 22 enters is formed in the center of the bottom surface 43b.
  • a half mirror portion 50 and a lens-shaped wavelength conversion member 33 are arranged in order from the bottom surface 43b toward the opening 43a.
  • the treatment site irradiation section 40 is arranged so as to be in contact with the opening 43a of the holding member 43.
  • the treatment site irradiation unit 40 is fitted or screwed into an opening 16 a formed in the front end 16 of the main body 12 .
  • the holding member 43 is fitted or screwed into the opening 16 a formed in the front end 16 of the main body 12 .
  • the holding member 43 can be removed at the opening 16a.
  • the laser handpiece 10C shown in FIG. 5 has the same effects as the laser handpiece 10A shown in FIG. 1(b).
  • FIG. 5 shows a laser irradiation device equipped with a laser handpiece according to a third modification of the first embodiment of the present invention, and (a) shows the configuration of the laser irradiation device including an external view of the laser handpiece.
  • FIG. 3B is a cross-sectional view of the laser handpiece.
  • the treatment site irradiation unit 40 is configured by a wavelength conversion member 32 and an irradiation member 44.
  • the wavelength conversion member 32 is formed in a cylindrical shape.
  • the wavelength conversion member 32 and the irradiation member 44 are integrally formed. Specifically, the other end of the irradiation member 44 is connected to one end of the wavelength conversion member 32 . Then, the other end of the wavelength conversion member 32 is fitted into the opening 16a formed in the front end 16 of the laser handpiece 10D, and is mounted.
  • the treatment site irradiation unit 40 can be removed at the opening 16a.
  • the half mirror section 50 is arranged on the other end side of the wavelength conversion member 32.
  • the wavelength conversion member 32 and the half mirror section 50 are integrally constructed.
  • the half mirror section 50 has a function of reflecting Stokes light having a wavelength converted to a wavelength including the wavelength of Stokes light generated by the Raman effect.
  • a holding member 43' for holding the condensing lens 26 is arranged between the half mirror section 50 and the condensing lens 26.
  • the holding member 43' has a disk shape with a convex cross section, and a light entrance hole 43c' through which the laser light emitted from the laser light guide 22 enters is formed in the center thereof.
  • the laser handpiece 10D shown in FIG. 5(b) has the same effects as the laser handpiece 10A shown in FIG. 1(b), as well as the following effects. That is, the treatment area irradiation unit 40 is fitted and attached to the opening 16a formed in the front end 16 of the laser handpiece 10D, and can be removed at the opening 16a, so the treatment area irradiation unit 40 can be easily attached. Can be exchanged.
  • FIG. 6 shows a laser irradiation device equipped with a laser handpiece according to a fourth modification of the first embodiment of the present invention, and (a) shows the configuration of the laser irradiation device including an external view of the laser handpiece.
  • FIG. 3B is a cross-sectional view of the laser handpiece.
  • the same parts as those in the laser handpiece 10A shown in FIG. 1 are denoted by the same reference numerals, and their explanations are omitted.
  • the treatment site irradiation unit 40 is configured by a holding member 43 and a treatment laser light guide 45.
  • the wavelength conversion member 32 of the amplification section 30 is formed into a lens shape.
  • the laser light from the laser light guide 22 enters from the other end side of the laser light guide for treatment 45 via the lens-shaped wavelength conversion member 33 formed in a lens shape. Therefore, the lenticular wavelength conversion member 33 is adjusted so as to be focused on the other end of the laser light guide 45 for treatment.
  • the lenticular wavelength conversion member 33 has a lenticular base material 33a formed in a lenticular shape.
  • the lenticular base material 33a has a lenticular shape.
  • the lens-shaped base material 33a is doped with a wavelength converting substance, so that the wavelength converting substance is diffused and arranged.
  • the holding member 43 is formed in a cylindrical shape, has an opening 43a arranged on one side, and has a bottom surface 43b on the other side.
  • a light entrance hole 43c through which the laser light emitted from the laser light guide 22 enters is formed in the center of the bottom surface 43b.
  • a half mirror portion 50 and a lens-shaped wavelength conversion member 33 are arranged in order from the bottom surface 43b toward the opening 43a.
  • a surgical laser light guide 45 is arranged in the opening 43a of the holding member 43.
  • the treatment laser light guide 45 is fitted or screwed into the opening 43a of the holding member 43.
  • the holding member 43 is fitted or screwed into the opening 16 a formed in the front end 16 of the main body 12 .
  • the holding member 43 can be removed at the opening 16a.
  • the treatment laser light guide 45 has the same configuration as the laser light guide 22.
  • the treatment laser light guide 45 is covered by a guide 46. That is, the treatment laser light guide 45 is disposed inside a guide 46 attached to an opening 43a formed at one end of the holding member 43, and a portion thereof is exposed from the guide 46. Further, at one end side of the laser light guide for treatment 45, the core portion 23 of the laser light guide for treatment 45 is exposed, and an exposed portion 45a is located.
  • a plurality of treatment site irradiation units 40 may be prepared in advance, each of which has a different length l and/or diameter of the treatment laser light guide 45 exposed from the guide 46.
  • the plurality of treatment site irradiation units 40 be replaced and attached to the main body 12 depending on the treatment site of the tooth.
  • a treatment in which the length l of the treatment laser light guide 45 exposed from the guide 46 increases in order toward central incisors, lateral incisors, canines, and molars for both upper and lower teeth.
  • a laser light guide 45 for treatment is prepared, or laser light guides 45 for treatment having different diameters are prepared. Note that the diameter of the laser light guide 45 for treatment at this time is preferably about 200 ⁇ m or more and 1000 ⁇ m or less.
  • the laser handpiece 10E shown in FIG. 6(a) has the same effect as the laser handpiece 10D shown in FIG. 5(b).
  • FIG. 7 shows a laser irradiation device equipped with a laser handpiece according to a second embodiment of the present invention, in which (a) is a configuration diagram of the laser irradiation device including an external view of the laser handpiece, and (b) ) is a cross-sectional view of the laser handpiece.
  • the laser irradiation device 1 includes a control device 70 including a laser handpiece 110A and a laser generator 72, as shown in FIG. 7(a).
  • the laser emitted from the laser generator 72 is transmitted to the laser handpiece 10A via the laser light guide 22.
  • the laser handpiece 110A includes a cylindrical main body portion 12, as shown in FIG. 7(b).
  • the laser handpiece 110A includes a condensing lens 26 for condensing the laser light from the laser light guide 22 to a focal position, and a wavelength for irradiating the treatment area with the laser beam condensed by the condensing lens 26. and an amplification section 30 having a conversion member 32.
  • a treatment site irradiation section 40 may be disposed in the amplification section 30 in order to efficiently irradiate the treatment site with Stokes light.
  • the main body part 12 has a storage part 18.
  • a rear end portion 14 to which a laser light guide 22 is mounted is disposed at the rear end of the storage portion 18, and a rear end portion 14 is provided at the front end of the storage portion 18 to direct the laser transmitted from the laser light guide 22 to the treatment area.
  • a front end 16 is arranged which is ejected towards the front end.
  • the laser hand piece 10A has a connecting part 20 in the middle part of the laser light guide 22 for detachably attaching the laser light guide 22 to the laser hand piece 110A.
  • the connecting portion 20 is preferably arranged at the rear end portion 14 of the main body portion 12 .
  • the connecting portion 20 includes a first connecting portion 20a and a second connecting portion 20b.
  • the connecting portion 20 can be separated into a first connecting portion 20a and a second connecting portion 20b.
  • the laser light guide 22 is separated into a laser light guide 22a connected to the first connection part 20a and a laser light guide 22b connected to the second connection part 20b.
  • the first connecting portion 20a is arranged on the rear end portion 14 side of the storage portion 18.
  • the laser light guide 22 includes a core section 23 for guiding laser light, a cladding 24 disposed around the core section 23, and a covering layer 25 disposed around the cladding 24.
  • the core portion 23, the cladding 24, and the covering layer 25 are arranged concentrically.
  • the configuration of the laser light guide 22 is similar to that of the laser light guide 22 of the first embodiment, so a detailed explanation will be omitted.
  • the storage section 18 of the laser handpiece 110A includes a condensing lens 26 that is irradiated with the laser light transmitted from the laser light guide 22, and a guide member 27 for guiding the laser light guide 22a.
  • the condensing lens 26 has a function of condensing the laser light transmitted from the laser light guide 22 to a focal position.
  • a protective glass 26a is placed between the laser light guide 22 and the condenser lens 26 to protect the laser light transmitted from the laser light guide 22 from directly entering the condenser lens 26. Placed. It is preferable that the diameter of the condenser lens 26 is approximately the same as the diameter of the laser light guide 22.
  • the guide member 27 is provided to guide the laser light guide 22 inserted through the connecting portion 20 at the rear end portion 14 of the storage portion 18 .
  • the guide member 27 is formed in a cylindrical shape.
  • a guide hole 27a for guiding and holding the laser light guide 22 is formed in the central axis of the guide member 27.
  • the guide member 27 is fixed in contact with the inner wall surface of the storage portion 18 and is disposed within the storage portion 18 .
  • the storage section 18 of the laser handpiece 110A has a reflection section 28 for reflecting the laser light irradiated from the laser light guide 22.
  • the reflection section 28 is provided to cause the laser light from the condensing lens 26 to enter the wavelength conversion member 32 at a predetermined angle ⁇ with respect to the direction of incidence from the laser light guide 22 .
  • the angle ⁇ is preferably, for example, 40° or more and 90° or less.
  • the reflecting section 28 has a mirror surface. Further, the reflecting section 28 is more preferably a pentaprism, and even more preferably a hexaprism or an octaprism. By using a pentaprism, a hexaprism, or an octaprism as the reflection section 28, the laser beam incident from the condenser lens 26 can be more converged when emitted to the wavelength conversion member 32. Further, the focal point P of the condenser lens 26 is arranged on the exit surface from which the laser beam is emitted from the reflection section 28 .
  • An amplification section 30 is arranged at the front end section 16 of the main body section 12. More specifically, the amplifying section 30 is arranged to protrude from the front end section 16 of the main body section 12 at an angle ⁇ with respect to the direction of incidence of the laser light guide 22 .
  • the amplification unit 30 is provided to irradiate the treatment site with the laser light focused by the condenser lens 26.
  • the amplification section 30 includes a wavelength conversion member 32 and a cover member 34 for protecting the wavelength conversion member 32.
  • the cover member 34 for protecting the wavelength conversion member 32 has a cylindrical cover body 36 and a transmission window 38 disposed inside the cover body 36.
  • the cover main body part 36 of the cover member 34 has a first holding part 36a for holding the wavelength conversion member 32 and a second holding part 36b for holding the treatment area irradiation part 40, with the transmission window 38 as a boundary. provided.
  • the outer portion of the first holding portion 36a of the cover main body portion 36 is screwed or fitted into the opening 16a of the front end portion 16 of the laser handpiece.
  • the treatment area irradiation unit 40 includes a flat base member 42 and is disposed on one side of the base member 42, and is configured to irradiate the Stokes light irradiated from the amplification unit 30 to the treatment area. It has a member 44.
  • the base member 42 and the irradiation member 44 are integrally formed.
  • the irradiation member 44 of the treatment site irradiation section 40 is made of, for example, quartz, sapphire, or zirconia.
  • the base member 42 of the treatment site irradiation unit 40 is, for example, formed in a disc shape.
  • the base member 42 is fitted into and held by the second holding portion 36b of the cover body portion 36 of the cover member 34.
  • the base member 42 is formed of a member that blocks Stokes light, reflected light, etc., and is formed of, for example, a metal plate or a protective filter.
  • the irradiation member 44 is disposed to penetrate through the center of one side of the base member 42.
  • the irradiation member 44 is made of, for example, rod-shaped quartz, sapphire, or zirconia.
  • the half mirror section 50 is disposed on the other end side of the wavelength conversion member 32 and has a function of reflecting Stokes light having a wavelength converted to a wavelength including the wavelength of laser light generated by the Raman effect. That is, for example, when the wavelength conversion material is titanium oxide and the wavelength generated by the Raman effect is 3000 nm, the half mirror section 50 is arranged to reflect the wavelength of 3000 nm.
  • the control device 70 includes a laser generator 72 that emits a laser beam to the laser handpiece 110A, and a controller that transmits the laser beam emitted from the laser generator 72 to the laser handpiece 110A.
  • a laser light guide 74 is provided.
  • the laser generating section 72 emits a laser beam under the control of a control section (not shown), and outputs the laser beam through the laser light guide 74 to the laser handpiece 110A.
  • FIG. 8 is a sectional view of a laser handpiece according to a first modification of the second embodiment of the invention.
  • the same parts as those in the laser handpiece 110A shown in FIG. 8 the same parts as those in the laser handpiece 110A shown in FIG.
  • a Q-switch element 60 is arranged between the condenser lens 26 and the amplification section 30.
  • the Q-switch element 60 can be activated with respect to the laser light incident from the condensing lens 26 to generate a Q-switch pulse.
  • the laser handpiece 110B shown in FIG. 8 has the same effects as the laser handpiece 110A shown in FIG. 7(b), and also has the following effects. That is, since the Q-switch element 60 is provided between the condenser lens 26 and the amplification section 30, the laser light from the laser light guide 22 is made into a Q-switch pulse and enters the amplification section 30 in a more amplified state. be able to. Therefore, the treatment site can be irradiated with laser light with increased energy density per unit area.
  • FIG. 9 is a sectional view of a laser handpiece according to a second modification of the second embodiment of the invention.
  • the same parts as those in the laser handpiece 110A shown in FIG. 9 the same parts as those in the laser handpiece 110A shown in FIG.
  • the wavelength conversion member 32 of the amplifying section 30 is formed into a lens shape and is arranged in the middle part of the storage section 18 of the main body section 12. Ru.
  • the laser light from the laser light guide 22 enters from the other end side of the irradiation member 44 of the treatment site irradiation unit 40 via the lens-shaped wavelength conversion member 33 formed in the shape of a lens. Therefore, the lenticular wavelength conversion member 33 is adjusted so as to be focused on the other end of the irradiation member 44 of the treatment site irradiation section 40.
  • the lenticular wavelength conversion member 33 has a lenticular base material 33a formed in a lenticular shape.
  • the lenticular base material 33a has a lenticular shape.
  • the lens-shaped base material 33a is doped with a wavelength converting substance, so that the wavelength converting substance is diffused and arranged.
  • a half mirror portion 50 is arranged between the laser light guide 22 and the lens-shaped wavelength conversion member 33. Further, the half mirror section 50 is arranged so as to be in contact with the laser light guide 22.
  • the half mirror section 50 has a function of reflecting laser light having a wavelength converted to a wavelength including the wavelength of Stokes light generated by the Raman effect.
  • the laser handpiece 10C according to the second modification of the second embodiment further includes a holding member 43 that holds the treatment site irradiation unit 40.
  • the holding member 43 is formed in a cylindrical shape, has an opening 43a arranged on one side, and has a bottom surface 43b on the other side.
  • a light entrance hole 43c through which the laser light emitted from the laser light guide 22 enters is formed in the center of the bottom surface 43b.
  • a half mirror portion 50 and a lens-shaped wavelength conversion member 33 are arranged in order from the bottom surface 43b toward the opening 43a.
  • the treatment site irradiation section 40 is arranged so as to be in contact with the opening 43a of the holding member 43.
  • the treatment site irradiation unit 40 is fitted or screwed into an opening 16 a formed in the front end 16 of the main body 12 .
  • the holding member 43 is fitted or screwed into the opening 16 a formed in the front end 16 of the main body 12 .
  • the holding member 43 can be removed at the opening 16a.
  • the laser handpiece 110C shown in FIG. 9 has the same effects as the laser handpiece 110A shown in FIG. 7(b).
  • FIG. 10 shows a laser handpiece according to a third modification of the second embodiment of the present invention, in which (a) is an external view of the laser handpiece, and (b) is a cross-sectional view thereof. .
  • the same parts as those in the laser handpiece 110A shown in FIG. 7 are denoted by the same reference numerals, and the description thereof will be omitted.
  • the treatment site irradiation unit 40 is configured by a wavelength conversion member 32 and an irradiation member 44.
  • the wavelength conversion member 32 is formed in a cylindrical shape.
  • the wavelength conversion member 32 and the irradiation member 44 are integrally formed. Specifically, the other end of the irradiation member 44 is connected to one end of the wavelength conversion member 32 . Then, the other end side of the wavelength conversion member 32 is fitted into the opening 16a formed in the front end 16 of the laser handpiece 110D and attached.
  • the treatment site irradiation unit 40 can be removed at the opening 16a.
  • the half mirror section 50 is arranged on the other end side of the wavelength conversion member 32.
  • the half mirror section 50 has a function of reflecting laser light having a wavelength converted to a wavelength including the wavelength of Stokes light generated by the Raman effect.
  • the laser handpiece 110D shown in FIG. 10 has the same effects as the laser handpiece 110A shown in FIG. 7(b), as well as the following effects. That is, the treatment area irradiation unit 40 is fitted and attached to the opening 16a formed in the front end 16 of the laser handpiece 110D, and can be removed at the opening 16a, so the treatment area irradiation unit 40 can be easily attached. Can be exchanged.
  • FIG. 11 shows a laser handpiece according to a fourth modification of the second embodiment of the present invention, in which (a) is an external view of the laser handpiece, and (b) is a cross-sectional view thereof. .
  • the same parts as those in the laser handpiece 110A shown in FIG. 7 are denoted by the same reference numerals, and the description thereof will be omitted.
  • the treatment site irradiation unit 40 is configured by a holding member 43 and a treatment laser light guide 45.
  • the wavelength conversion member 32 of the amplification section 30 is formed into a lens shape.
  • the laser light from the laser light guide 22 enters from the other end side of the laser light guide for treatment 45 via the lens-shaped wavelength conversion member 33 formed in a lens shape. Therefore, the lenticular wavelength conversion member 33 is adjusted so as to be focused on the other end of the laser light guide 45 for treatment.
  • the lenticular wavelength conversion member 33 has a lenticular base material 33a formed in a lenticular shape.
  • the lenticular base material 33a has a lenticular shape.
  • the lens-shaped base material 33a is doped with a wavelength converting substance, so that the wavelength converting substance is diffused and arranged.
  • the holding member 43 is formed in a cylindrical shape, has an opening 43a arranged on one side, and has a bottom surface 43b on the other side.
  • a light entrance hole 43c through which the laser light emitted from the laser light guide 22 enters is formed in the center of the bottom surface 43b.
  • a half mirror portion 50 and a lens-shaped wavelength conversion member 33 are arranged in order from the bottom surface 43b toward the opening 43a.
  • a surgical laser light guide 45 is arranged in the opening 43a of the holding member 43.
  • the treatment laser light guide 45 is fitted or screwed into the opening 43a of the holding member 43.
  • the holding member 43 is fitted or screwed into the opening 16 a formed in the front end 16 of the main body 12 .
  • the holding member 43 can be removed at the opening 16a.
  • the treatment laser light guide 45 has the same configuration as the laser light guide 22.
  • the treatment laser light guide 45 is covered by a guide 46. That is, the treatment laser light guide 45 is disposed inside a guide 46 attached to an opening 43a formed at one end of the holding member 43, and a portion thereof is exposed from the guide 46. Further, at one end side of the laser light guide for treatment 45, the core portion 23 of the laser light guide for treatment 45 is exposed, and an exposed portion 45a is located.
  • a plurality of treatment site irradiation units 40 may be prepared in advance, each of which has a different length l and/or diameter of the treatment laser light guide 45 exposed from the guide 46.
  • the plurality of treatment site irradiation units 40 be replaced and attached to the main body 12 depending on the treatment site of the tooth.
  • a treatment in which the length l of the treatment laser light guide 45 exposed from the guide 46 increases in order toward central incisors, lateral incisors, canines, and molars for both upper and lower teeth.
  • a laser light guide 45 for treatment is prepared, or laser light guides 45 for treatment having different diameters are prepared. Note that the diameter of the laser light guide 45 for treatment at this time is preferably about 200 ⁇ m or more and 1000 ⁇ m or less.
  • the laser handpiece 110E shown in FIG. 11 has the same effects as the laser handpiece 110D shown in FIG. 10.
  • FIG. 12 is a cross-sectional view of a laser handpiece according to a third embodiment of the present invention, in which (a) shows a state where the laser probe is housed in the main body, and (b) shows a state where the laser probe is housed in the main body. Shows that it has been extracted from.
  • FIG. 13 shows an amplification section of a laser handpiece according to a third embodiment of the present invention, in which (a) shows the structure of one example of the amplification section, and (b) shows the structure of another example of the amplification section. shows.
  • the laser handpiece 210A according to the third embodiment also includes a control device, etc., like the laser irradiation device 1 of the first embodiment and the second embodiment, but the explanation thereof will be omitted. do.
  • the laser emitted from the laser generator is transmitted to the laser handpiece 210A via the laser light guide 22.
  • the laser handpiece 210A includes a cylindrical main body 212 to which a laser light guide 22 for transmitting laser light from a laser generator (not shown) is attached.
  • the main body section 212 has a storage section 218.
  • a rear end portion 214 to which the laser light guide 22 is attached is arranged on the rear end side of the storage portion 218 .
  • the laser light guide 22 is inserted and attached to the rear end portion 214 via a connecting member 262, which will be described later.
  • a front end portion 216 is disposed on the front end side of the storage portion 218, which is the side from which the laser transmitted from the laser light guide 22 is emitted toward the treatment site.
  • a laser probe 234, which will be described later, is connected to the front end 216 of the storage section 218.
  • a front end opening 216a is formed in the front end portion 216 located on the front end side of the storage portion 218.
  • a connecting portion 216b is formed on the inner surface of the front end opening 216a.
  • the connecting portion 216b is, for example, a female thread, but is not limited to this.
  • a main body side holding member 220 and a guide member 222 are arranged inside the storage section 218, a main body side holding member 220 and a guide member 222 are arranged.
  • the main body side holding member 220 is provided to hold the other end side of the amplifying section 230A (230B) held in a laser probe 234, which will be described later.
  • the main body side holding member 220 is formed in a columnar shape, and an insertion hole 220a is formed in the central axis thereof.
  • the guide member 222 is provided to guide the laser light guide 22 inserted through the rear end member 260 connected at the rear end 214 of the storage section 218.
  • the guide member 222 is formed in a cylindrical shape.
  • a guide hole 222 a for guiding and holding the laser light guide 22 is formed in the central axis of the guide member 222 .
  • the laser hand piece 210A has a connecting part 20 in the middle part of the laser light guide 22 for detachably attaching the laser light guide 22 to the laser hand piece 210A. You may do so.
  • the laser handpiece 210A is provided with a disk-shaped rear end member 260 for holding the laser light guide 22 at the rear end portion 214.
  • An insertion hole 260a is formed in the center of the rear end member 260 for inserting and fixing a connecting member 262, which will be described later.
  • the laser hand piece 210A has a connecting member 262 in the middle portion of the laser light guide 22 for detachably attaching the laser light guide 22 to the laser hand piece 210A.
  • the connecting member 262 is formed in a cylindrical shape.
  • the connecting member 262 is inserted into the insertion hole 260a of the rear end member 260 and fixed.
  • a fixing hole 262a for holding and fixing the laser light guide 22 is formed in the central axis of the connecting member 262. Thereby, the movement of the laser light guide 22 in the axial direction relative to the laser hand piece 210A is restricted and fixed.
  • the laser light guide 22 that has passed through the fixing hole 262a of the connecting member 262 is further inserted into the guide hole 222a of the guide member 222, and its tip is fixed in the insertion hole 220a of the main body side holding member 220.
  • the laser light guide 22 includes a core portion 23 for guiding laser light, a cladding 24 placed around the core portion 23, and a covering layer 25 placed around the cladding 24.
  • the core portion 23, the cladding 24, and the covering layer 25 are arranged concentrically.
  • the core portion 23 is made of a material having a high refractive index, such as quartz containing Si (SiO 2 ).
  • the cladding 24 is formed of a material such as quartz or resin, and has a refractive index lower than that of the core portion 23 by about 0.2% or more and 1% or less.
  • the covering layer 25 is formed of a resin material such as a fluororesin, and protects the core portion 23 and the cladding 24 .
  • the core portion 23 is made of quartz (SiO 2 )
  • the cladding 24 is made of a hard resin material
  • the covering layer 25 is made of a resin material containing fluorine.
  • the core portion 23 according to this embodiment may be formed hollow.
  • the core portion 23 in this embodiment is formed of quartz (SiO 2 ), it is not limited to this, and for example, zirconia or sapphire may be used.
  • the covering layer 25 may be formed of fluoride glass containing metal.
  • a laser probe 234 including a treatment site irradiation section 240 for irradiating the treatment site with the laser beam irradiated from the amplification section 230A is attached to the front end section 216 of the main body section 212, and is connected to a connection section of the laser probe body section 236, which will be described later.
  • the main body portion 212 and the laser probe 234 are connected to each other by being screwed together or fitted through 236a. Thereby, the laser probe 234, including the amplifying section 230A, can be integrally attached and detached from the front end section 216 of the main body section 212.
  • the laser probe 234 includes a cylindrical laser probe body 236 having a tapered cross section from the rear end to the front end, and a probe side holding member 238 disposed inside the laser probe body 236.
  • An amplification section 230A that is held by a probe-side holding member 238 and has a wavelength conversion member 232 for amplifying the laser light transmitted by the laser light guide 22, and a treatment site is irradiated with the laser light irradiated from the amplification section 230A. and a treatment site irradiation unit 240 for irradiating the treatment area.
  • the laser probe main body 236 is formed into a cylindrical shape that tapers from the rear end side toward the front end side.
  • a guide 246, which will be described later, is arranged on the distal end side.
  • the laser probe main body portion 236 is made of resin, for example.
  • a connecting portion 236a for connecting to the connecting portion 216b of the front end portion 216 is formed on the outer wall surface of the rear end side of the laser probe main body portion 236.
  • the connecting portion 236a is formed of a male screw, but is not limited to this, and may be changed as appropriate depending on the means for connecting the front end portion 216 to the connecting portion 216b.
  • the probe-side holding member 238 is fixed in contact with the inner wall surface of the laser probe body 236.
  • An insertion hole 238a for fixing and holding the amplifying section 230A is formed in the central axis of the probe-side holding member 238.
  • the probe-side holding member 238 is made of metal or resin, for example.
  • the amplification unit 230A shown in FIG. 13(a) includes a condenser lens 226 for condensing the laser light from the laser light guide 22 to a focal position, and a condenser lens 226 for condensing the laser light from the laser light guide 22 to a focal position, and a condenser lens 226 for condensing the laser light transmitted through the condensing lens 226.
  • a wavelength conversion member 232 for irradiating the treatment area a sapphire part 280 that resonates and amplifies the laser light irradiated via the wavelength conversion member 232, and a sapphire part 280 that transmits the amplified laser light and and a protection filter 290 for reflecting and scattering the reflected light reflected from the mirror.
  • the condensing lens 226 is provided to condense the laser light that is incident from the laser light guide 22 and diffusely reflected.
  • the focus of the laser beam that has passed through the condenser lens 226 is adjusted to be located at the interface between the sapphire section 280 and a second half mirror section 250b, which will be described later.
  • the wavelength conversion member 232 is provided to irradiate the treatment site with the laser light focused by the condenser lens 226.
  • the wavelength conversion member 232 has a base material 232a.
  • the base material 232a is formed into a disk shape, and its diameter is approximately the same as the diameter of the laser light guide 22.
  • the wavelength converting substance is doped into the base material 232a, so that the wavelength converting substance is diffused and arranged. That is, the base material 232a is formed of oxidized zirconia, and the wavelength conversion substance is diffused and placed inside the base material 232a.
  • the base material 232a is doped with oxidized It is formed of zirconia, and a wavelength converting substance and carbon, iron oxide, iron dioxide, copper, zinc, chromium, silver, potassium, yttrium, germanium, silicon, etc. are diffused and arranged inside it.
  • the Stokes phenomenon is a phenomenon caused by the interaction of electrons between two atoms
  • Raman shift and Rayleigh shift occur between related atoms due to the relationship between the electron valence and the number of electrons in the orbit that is insufficient until the number of electrons becomes stable. It is estimated that the mutual influence of can be reflected in the magnitude of the Stokes phenomenon from the photon resonance phenomenon (for more detailed theoretical details, refer to Non-Patent Documents 1 to 6).
  • the wavelength conversion substance for example, titanium oxide or a rare earth laser medium such as Er, Yb, Nd, Bi, or Pr can be used.
  • the wavelength conversion material it is possible to select the output as laser light (Stokes light) resulting from Raman scattered light converted to a wavelength unique to each material produced by the Raman effect.
  • the particle size of the wavelength conversion substance is set to nano-level in order to ensure a surface area for efficiently producing the Raman effect, and the smaller the particle size, the more preferable.
  • the wavelength conversion material is selected in consideration of the absorption wavelength of water.
  • titanium oxide (TiO 2 ) is preferable as the titanium oxide.
  • the average particle diameter of titanium oxide as a wavelength conversion substance is preferably at the nano level, from 1 nm to 30 nm. Thereby, a surface area for efficiently producing the Raman effect can be secured.
  • the wavelength of the laser light output by Raman scattered light can be 3000 nm or more.
  • the theory of the wavelength shift to the infrared region due to titanium oxide is disclosed in Non-Patent Document 7 and Non-Patent Document 8.
  • the diameter of the core portion 23 is approximately 200 ⁇ m or more and 1000 ⁇ m or less, and the outer diameter of the cladding 24 is approximately 250 ⁇ m or more and 1050 ⁇ m or less.
  • the wavelength conversion member 232 a wavelength conversion substance is doped in the base material 232a, so that the wavelength conversion substance is diffused and arranged. That is, the base material 232a is formed of, for example, zirconia oxide, and the wavelength converting substance is diffused and placed inside the base material 232a. This makes it possible to provide a wavelength conversion member that can easily convert and amplify a wavelength different from the wavelength of the laser light output from the laser generator 72 even if the laser generator 72 has a low output. can.
  • the doping rate of titanium oxide as a wavelength conversion substance is preferably 0.1% or more and 30% or less. Thereby, the Raman effect can be produced more efficiently.
  • the wavelength conversion member 232 can be suitably used for dental treatment if the wavelength of the laser light outputted by the Raman scattered light is 3000 nm or more, which is the absorption wavelength of water.
  • the base material 232a of the wavelength conversion member 232 is made of, for example, zirconia oxide.
  • the base material 232a may be formed of quartz containing Si (SiO 2 ) or sapphire.
  • the wavelength conversion member 232 uses titanium oxide as a wavelength conversion substance and further uses titanium oxide (TiO 2 ), it is possible to obtain Stokes light by Raman scattered light generated by the Raman effect in the wavelength range necessary for treatment. I can do it.
  • the sapphire section 280 is provided to resonate and amplify the laser light irradiated via the wavelength conversion member 232.
  • Sapphire portion 280 is formed into a rod shape.
  • the diameter of the sapphire portion 280 is approximately the same as the diameter of the laser light guide 22.
  • the protection filter 290 is provided to transmit the amplified laser light and to reflect and scatter the reflected light reflected from the treatment site.
  • the reflected light reflected from the treatment area includes near-infrared to far-infrared laser light, but the protection filter 290 prevents the reflected light from the treatment area from entering the amplifying section 230A. It has a blocking function.
  • a plurality of reflective members each having a plurality of triangular pyramid shapes are arranged on the surface of the protective filter 290, and these reflective members prevent reflected light reflected from the treatment area from entering the amplification unit 230A. Can be blocked.
  • the shape of the plurality of reflecting members disposed on the surface of this protective filter 290 is preferably a triangular pyramid, but may also be a conical shape.
  • FIG. 13(b) shows an amplifying section 230B that is another example of the amplifying section 230A.
  • the amplifying section 230B shown in FIG. 13(b) includes a half mirror section 250, unlike the amplifying section 230A shown in FIG. 13(a).
  • the half mirror section 250 includes a first half mirror section 250a and a second half mirror section 250b.
  • the first half mirror section 250a has a function of reflecting Stokes light having a Raman-modulated wavelength. That is, for example, when a laser beam of 980 nm or 810 nm from the laser light guide 22 enters the amplification section 230B, the first half mirror section 250a transmits the laser beam to the wavelength conversion member 232. The light is incident and Raman modulated within the wavelength conversion member 232.
  • the second half mirror section 250b has a function of passing a laser beam having a Raman-modulated wavelength and an intensity that has reached a specific output. That is, in the second half mirror section 250b, the transmittance is set so that the wavelength of Stokes light having a certain desired wavelength transmittance is transmitted. For example, when the Raman-modulated Stokes light is reflected between the first half mirror section 250a and the second half mirror section 250b and reaches a desired Stokes light wavelength transmittance, the Raman-modulated Stokes light The light passes through the mirror section 250b.
  • the treatment site irradiation unit 240 includes a treatment laser light guide 245 having the same configuration as the laser light guide 22.
  • the treatment laser light guide 245 is placed inside a guide 246 that is attached to an opening 234b formed at one end of the laser probe 234, with a portion of the guide 246 being exposed from the guide 246. That is, the laser light guide for treatment 245 is covered by a guide 246, and at one end side, the core portion 23 of the laser light guide for treatment 245 is exposed, and an exposed portion 245a is located.
  • the exposed portion 245a at the tip of the laser light guide 245 for treatment is provided with an angle ⁇ along the guide 246 with respect to the direction of incidence by the laser light guide 245 for treatment.
  • the angle ⁇ is preferably, for example, 40° or more and 90° or less.
  • the guide 246 is formed into a cylindrical shape.
  • a treatment site irradiation unit 240 is arranged inside the guide 246 .
  • the guide 246 is held by 234b formed at one end of the laser probe 234 and is arranged to protrude.
  • the guide 246 is made of resin or aluminum, for example. Thereby, as shown in FIG. 12, the guide 246 can be bent at the intermediate portion of the guide 246, so that the exposed portion 245a of the treatment site irradiation unit 240 can be easily directed in a desired direction.
  • a plurality of laser probes 234 having different lengths l and/or diameters of the treatment laser light guide 245 exposed from the guide 246 may be prepared in advance.
  • the plurality of laser probes 234 be replaced and attached to the main body 212 depending on the area to be treated on the tooth.
  • a probe 234 is prepared, or laser probes 234 having a treatment laser light guide 245 having a different diameter are prepared.
  • the diameter of the treatment laser light guide 245 at this time is preferably about 200 ⁇ m or more and 1000 ⁇ m or less.
  • the laser probe 234 of the laser handpiece 210A is screwed or fitted into the front end 216 of the main body 212 of the laser handpiece, so that the laser probe 234 includes the amplifier section 230A (230B). Since the laser probe 234 can be removed integrally from the front end portion 216 of the main body portion 212, the laser probe 234 can be easily replaced together with the amplification portion 230A (230B).
  • FIG. 14 is a sectional view of a laser handpiece according to a modification of the third embodiment of the present invention, in which (a) shows the laser probe housed in the main body, and (b) shows the laser handpiece. The figure shows the state in which it has been pulled out from the main body.
  • the same parts as those in the laser handpiece 210A shown in FIG. 12 are denoted by the same reference numerals, and the explanation thereof will be omitted.
  • the laser handpiece 210B according to the modification differs from the laser handpiece 210A in that the amplifying section 230A (230B) is arranged not on the laser probe 234 side but on the main body section 212 side.
  • the amplification section 230A (230B) is held by the main body side holding member 220 and the guide member 222 arranged in the storage section 218. Therefore, the other end of the treatment site irradiation unit 240 is provided so as to pass through the probe-side holding member 238 and partially protrude from the rear end side.
  • a plurality of laser probes 234 may be prepared in advance, each of which has a different length l and/or diameter of the treatment laser light guide 245 exposed from the guide 246.
  • the plurality of laser probes 234 be replaced and attached to the main body 212 depending on the area to be treated on the tooth.
  • a laser beam in which the length l of the treatment laser light guide 245 exposed from the guide 246 becomes longer toward the central incisors, lateral incisors, canines, and molars in order for both the upper teeth and the lower teeth.
  • a probe 234 is prepared, or laser probes 234 having a treatment laser light guide 245 having a different diameter are prepared.
  • the diameter of the treatment laser light guide 245 at this time is preferably about 200 ⁇ m or more and 1000 ⁇ m or less.
  • the laser handpiece 210B shown in FIG. 14 has the same effects as the laser handpiece 210A shown in FIG. 12, as well as the following effects. That is, since the amplification section 230A (230B) is provided on the main body section 212 side, the laser probe 234 can be set at a relatively low cost, and the laser probe 234, which can be a consumable item, can be replaced economically. can.
  • the laser handpiece according to the present invention can be suitably used, for example, as a laser handpiece used for treatment.

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Abstract

L'invention concerne une pièce à main laser comprenant un élément de conversion de longueur d'onde capable d'amplification et de conversion de longueur d'onde en différentes longueurs d'onde comprenant une sortie de lumière laser provenant d'une unité de génération de laser.　Une pièce à main laser selon la présente invention comprend une partie corps en forme de tube à laquelle est fixé un corps de guidage de lumière laser pour transmettre une lumière laser provenant d'une unité de génération de laser. Sur la partie corps sont disposées une unité d'amplification qui a un élément de conversion de longueur d'onde pour irradier un site de procédure avec une lumière laser transmise par le corps de guidage de lumière laser et une unité d'irradiation de site de procédure qui est destinée à irradier le site de procédure avec une lumière de Stokes émise par l'unité d'amplification. La présente invention est caractérisée en ce que : l'élément de conversion de longueur d'onde a un matériau de base ; un matériau de conversion de longueur d'onde est ajouté par dopage au matériau de base, de telle sorte que le matériau de conversion de longueur d'onde est disposé de manière diffuse ; et lorsque la lumière laser est incidente sur l'élément de conversion de longueur d'onde, un effet Raman basé sur le matériau de conversion de longueur d'onde se produit dans l'élément de conversion de longueur d'onde, de telle sorte que la lumière diffusée Raman, obtenue par conversion de longueur d'onde en longueurs d'onde comprenant celle de la lumière laser, est délivrée en sortie.
PCT/JP2023/010587 2022-03-17 2023-03-17 Pièce à main laser WO2023176961A1 (fr)

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JP2022042398 2022-03-17
JP2022-042398 2022-03-17

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010083566A2 (fr) * 2009-01-22 2010-07-29 Med-Aesthetic Solutions International Pty. Ltd. Système et procédé de traitement dermatologique
WO2020017639A1 (fr) * 2018-07-20 2020-01-23 株式会社ニューロシューティカルズ Dispositif d'émission de lumière
WO2020251054A1 (fr) * 2019-06-14 2020-12-17 Ｓｄｎｉコスモ株式会社 Élément de conversion de longueur d'onde, dispositif de conversion de longueur d'onde et dispositif d'irradiation laser l'utilisant, et procédé de fabrication d'élément de conversion de longueur d'onde

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010083566A2 (fr) * 2009-01-22 2010-07-29 Med-Aesthetic Solutions International Pty. Ltd. Système et procédé de traitement dermatologique
WO2020017639A1 (fr) * 2018-07-20 2020-01-23 株式会社ニューロシューティカルズ Dispositif d'émission de lumière
WO2020251054A1 (fr) * 2019-06-14 2020-12-17 Ｓｄｎｉコスモ株式会社 Élément de conversion de longueur d'onde, dispositif de conversion de longueur d'onde et dispositif d'irradiation laser l'utilisant, et procédé de fabrication d'élément de conversion de longueur d'onde

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