WO2014024532A1 - ファイバユニット - Google Patents
ファイバユニット Download PDFInfo
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- WO2014024532A1 WO2014024532A1 PCT/JP2013/063168 JP2013063168W WO2014024532A1 WO 2014024532 A1 WO2014024532 A1 WO 2014024532A1 JP 2013063168 W JP2013063168 W JP 2013063168W WO 2014024532 A1 WO2014024532 A1 WO 2014024532A1
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- fiber
- core
- illumination
- soft
- light
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
- A61B1/00163—Optical arrangements
- A61B1/00165—Optical arrangements with light-conductive means, e.g. fibre optics
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/0059—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence
- A61B5/0082—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence adapted for particular medical purposes
- A61B5/0084—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence adapted for particular medical purposes for introduction into the body, e.g. by catheters
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- 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
-
- 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
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02042—Multicore optical fibres
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B2562/00—Details of sensors; Constructional details of sensor housings or probes; Accessories for sensors
- A61B2562/02—Details of sensors specially adapted for in-vivo measurements
- A61B2562/0233—Special features of optical sensors or probes classified in A61B5/00
Definitions
- the present invention relates to a fiber unit used for a measurement probe that irradiates a sample with irradiation light and receives light from the sample.
- an optical measurement system that irradiates a sample such as a biological tissue with illumination light and estimates the property of the sample based on a measurement value of detection light reflected or scattered from the sample.
- Such an optical measurement system is detachable from the optical measurement device having a light source that emits illumination light to the sample and a detection unit that detects detection light from the sample, and irradiation of the sample. It is configured using light irradiation and a measurement probe that receives light from the sample.
- the measurement probe has one end connected to a light source, an illumination fiber for irradiating the living tissue with illumination light from the other end, and one end connected to the detection unit, and the other end reflected or scattered from the living tissue by irradiation with the irradiation fiber. And a light receiving fiber for receiving the detection light.
- low coherent white light with a short spatial coherence length is irradiated onto the living tissue from the tip of the illumination fiber of the measurement probe, and the intensity distribution of scattered light at multiple angles is measured using multiple light receiving fibers.
- LEBS Low-Coherence Enhanced Backscattering
- the measurement probe is required to have a small diameter in order to reduce the burden on the patient when inserted into the patient's body. In response to this demand, it is necessary to reduce the diameter of each fiber of the fiber unit.
- the present invention has been made in view of the above, and an object thereof is to provide a fiber unit capable of preventing fiber breakage during manufacturing.
- a fiber unit according to the present invention is provided in a measurement probe that performs optical measurement by inputting and outputting light from a tip, and includes one or a plurality of illumination fibers. And a fiber unit having a plurality of detection fibers, wherein the illumination fiber and the detection fiber are provided with a bendable soft part, and a distal end hard part having a higher hardness than the soft part, Pitch conversion that changes the distance between adjacent fibers in the distal hard portion with respect to the distance between adjacent fibers in the flexible portion by connecting the soft portion and the distal hard portion and bending and extending.
- the fiber unit according to the present invention has the first covering portion that covers the side surface of the soft portion in the above invention, the covering thickness of the first covering portion is D 1 , and the length of the pitch converting portion is When D A is set, 0.005 ⁇ D 1 / D A ⁇ 0.032 is satisfied.
- the fiber unit according to the present invention when the distal end rigid portion and a second cover portion covering a side surface of the pitch conversion unit, the coating thickness of the second covering portion and the D 2 15 ⁇ D 1 / D 2 ⁇ 100.
- the fiber unit according to the present invention is characterized in that, in the above invention, the illumination fiber and the detection fiber are arranged in a line.
- the illumination fiber and the detection fiber have a core portion that propagates light, and a diameter D_core of the core portion satisfies 15 ⁇ m ⁇ D_core ⁇ 45 ⁇ m. It is characterized by that.
- the fiber unit according to the present invention is the above-described invention, wherein the illumination fiber and the detection fiber cover an outer periphery of the core portion and have an outer layer portion having a refractive index smaller than that of the core portion,
- the diameter D_core of the portion and the diameter D_clad of the outer layer portion satisfy 0.60 ⁇ D_core / D_clad ⁇ 0.75, and the numerical aperture NA of the illumination fiber and the detection fiber is 0.20 ⁇ NA ⁇ 0. .25 is satisfied.
- FIG. 1 is a block diagram schematically showing a configuration of an optical measurement system according to an embodiment of the present invention.
- FIG. 2 is a diagram schematically showing a cross section of the measurement probe including the optical element of the optical measurement system according to the embodiment of the present invention along the longitudinal direction.
- FIG. 3 is a plan view schematically showing the measurement probe in the direction of arrow A in FIG.
- FIG. 4 is a diagram illustrating a situation when the optical measurement system according to the embodiment of the present invention is used in an endoscope system.
- FIG. 5 is a schematic diagram showing a configuration of an irradiation fiber of the optical measurement system according to the embodiment of the present invention.
- FIG. 6 is a plan view schematically showing an irradiation fiber in the direction of arrow B in FIG.
- FIG. 7 is a sectional view schematically showing a configuration of an irradiation fiber of the optical measurement system according to the embodiment of the present invention.
- FIG. 8 is a diagram for explaining the distance between the fibers
- FIG. 1 is a block diagram schematically showing a configuration of an optical measurement system according to an embodiment of the present invention.
- An optical measurement system 1 illustrated in FIG. 1 includes an optical measurement device 2 that performs optical measurement on a measurement object such as a biological tissue that is a scatterer, and detects a property (characteristic) of the measurement object, and an optical measurement device 2. And a measurement probe 3 for measurement inserted into the subject.
- the optical measuring device 2 includes a power source 21, a light source unit 22, a connection unit 23, a light receiving unit 24, an input unit 25, an output unit 26, a recording unit 27, and a control unit 28.
- the power source 21 supplies power to each component of the optical measuring device 2.
- the light source unit 22 uses an incoherent light source such as a white LED (Light Emitting Diode), a xenon lamp, a tungsten lamp, and a halogen lamp, and one or a plurality of lenses, for example, a condensing lens or a collimating lens, as necessary. Realized.
- the light source unit 22 outputs to the measurement probe 3 incoherent light having at least one spectral component that is irradiated onto the measurement object via the connection unit 23.
- connection unit 23 detachably connects the connector unit 31 of the measurement probe 3 to the optical measurement device 2.
- the connection unit 23 outputs light emitted from the light source unit 22 to the measurement probe 3 and outputs return light of illumination light emitted from the measurement probe 3 and reflected and / or scattered by the measurement object to the light receiving unit 24.
- the connection unit 23 outputs information related to whether or not the measurement probe 3 is connected to the control unit 28.
- the light receiving unit 24 receives and measures the return light of the illumination light emitted from the measurement probe 3 and reflected and / or scattered by the measurement object.
- the light receiving unit 24 is realized by using a plurality of spectrometers, light receiving sensors, and the like. Specifically, the light receiving unit 24 is provided according to the number of light receiving fibers of the measurement probe 3 described later by the spectroscopic measuring device.
- the light receiver 24 measures each wavelength by measuring the spectral component and the intensity distribution of the scattered light incident from the measurement probe 3.
- the light receiving unit 24 outputs the measurement result to the control unit 28.
- the input unit 25 is realized by using a push-type switch, a touch panel, or the like, and receives an input of an instruction signal for instructing activation of the optical measurement device 2 or an instruction signal for instructing various other operations and outputs the instruction signal to the control unit 28. To do.
- the output unit 26 is realized by using a liquid crystal or organic EL (Electro Luminescence) display, a speaker, and the like, and outputs information on various processes in the optical measuring device 2. Further, under the control of the control unit 28, the output unit 26 displays numerical values such as the intensity of light received by the light receiving unit 24 (characteristic value calculated by the calculation unit 28a described later) on the display.
- a liquid crystal or organic EL Electro Luminescence
- the recording unit 27 is realized by using a volatile memory or a non-volatile memory, and records various programs for operating the optical measuring device 2, various data used for optical measurement processing, and various parameters.
- the recording unit 27 temporarily records information being processed by the optical measurement device 2.
- the recording unit 27 records the measurement result of the optical measurement device 2 in association with the subject to be measured. Note that the recording unit 27 may be configured using a memory card or the like mounted from the outside of the optical measurement device 2.
- the control unit 28 is configured using a CPU (Central Processing Unit) or the like.
- the control unit 28 controls the processing operation of each unit of the optical measuring device 2.
- the control unit 28 controls the operation of the optical measurement device 2 by transferring instruction information and data corresponding to each unit of the optical measurement device 2.
- the control unit 28 records the measurement result by the light receiving unit 24 in the recording unit 27.
- the control unit 28 includes a calculation unit 28a.
- the calculation unit 28a performs a plurality of calculation processes based on the measurement result by the light receiving unit 24, and calculates a characteristic value related to the property of the measurement object.
- the type of the characteristic value is set according to an instruction signal received by the input unit 25, for example.
- the measurement probe 3 is realized by arranging a plurality of optical fibers therein.
- the measurement probe 3 includes an illumination fiber that emits illumination light to the measurement object, and a plurality of light receiving fibers that receive return light of the illumination light reflected and / or scattered by the measurement object at different angles.
- the measurement probe 3 irradiates the illumination light supplied from the connector part 31 detachably connected to the connection part 23 of the optical measurement device 2, the flexible part 32 having flexibility, and the light source part 22, And a tip portion 33 that receives return light from the measurement object.
- FIG. 2 is a diagram schematically showing a cross section of the distal end portion 33 of the measurement probe 3 cut along the longitudinal direction.
- FIG. 3 is a plan view schematically showing the measurement probe 3 in the direction of arrow A in FIG.
- the tip portion 33 is provided with an optical element 34 that forms a part of the outer surface of the measurement probe 3.
- the measurement probe 3 includes an illumination fiber 311 that irradiates the measurement object with illumination light, a first light receiving fiber 312, a second light receiving fiber 313, and a third light receiving light that are reflected and / or scattered by the measurement object.
- a fiber unit 310 composed of a light receiving fiber 314, an illumination fiber 311, a first light receiving fiber 312, and a covering member 315 made of glass, resin, etc., for preventing damage and fixing positions of the second light receiving fiber 313 and the third light receiving fiber 314.
- a protection part 316 that protects the covering member 315 from an external force
- a protection part 316 that includes the protection part 316 and a probe sheath 317 that covers the outer peripheral surface of the optical element 34.
- the illumination fiber 311 propagates the illumination light output from the light source unit 22 and irradiates the measurement object with the illumination light via the optical element 34. Note that the number of illumination fibers 311 can be changed as appropriate according to the type of inspection item or measurement object, for example, blood flow or site.
- the illumination fiber 311 is configured using, for example, a step index type single core fiber.
- the first light receiving fiber 312, the second light receiving fiber 313, and the third light receiving fiber 314 propagate the return light of the illumination light reflected and / or scattered by the measurement object incident from the respective tips via the optical element 34, Output to the light receiving unit 24 of the optical measuring device 2.
- the number of light receiving fibers can be appropriately changed according to the inspection item or the type of measurement object, for example, blood flow or site.
- the first light receiving fiber 312, the second light receiving fiber 313, and the third light receiving fiber 314 are configured by using, for example, a step index type single core fiber.
- the optical element 34 has a cylindrical shape and is configured using transmissive glass having a predetermined refractive index.
- the optical element 34 is formed such that the distance between the illumination fiber 311 and the measurement object is fixed, and light can be irradiated with a constant spatial coherence length.
- the optical element 34 fixes the distance between the first light receiving fiber 312 and the measurement object, the distance between the second light receiving fiber 313 and the measurement object, and the distance between the third light receiving fiber 314 and the measurement object, respectively. It is formed so that the return light having a predetermined scattering angle can be received stably.
- the optical measurement system 1 configured as described above includes a measurement probe via a treatment instrument channel 111 provided in the endoscope apparatus 110 (endoscope scope) of the endoscope system 100. 3 is inserted into the subject, the illumination fiber 311 irradiates the measurement object with illumination light, and the first light reception fiber 312, the second light reception fiber 313, and the third light reception fiber 314 are reflected and / or reflected by the measurement object, respectively.
- the return light of the scattered illumination light is received at different scattering angles and propagated to the light receiving unit 24 of the optical measuring device 2.
- the calculation unit 28 a calculates the characteristic value of the property of the measurement object based on the measurement result of the light receiving unit 24.
- the illumination fiber 311, the first light receiving fiber 312, the second light receiving fiber 313, and the third light receiving fiber 314 of the measurement probe 3 are bent so that the distance from the adjacent fiber at the distal end portion 33 is shortened. 34 abuts.
- FIG. 5 is a schematic diagram showing a configuration of the irradiation fiber 311 of the optical measurement system 1 according to the present embodiment.
- FIG. 6 is a plan view schematically showing the irradiation fiber 311 in the direction of arrow B in FIG.
- FIG. 7 is a cross-sectional view schematically showing the configuration of the irradiation fiber 311 of the optical measurement system 1 according to the present embodiment, and is a view of the irradiation fiber 311 shown in FIG. 5 as viewed from above.
- the illumination fiber 311 is inserted into the flexible portion 32 and bends a soft portion 331 that is bendable, and an end portion on the light receiving side, and a distal end hard portion having a hardness higher than the hardness of the soft portion 331.
- the soft portion 331, and the distal end hard portion 332 are connected to each other, and are bent and extended at both end portions, so that the distance between adjacent fibers in the soft portion 331 is different from those adjacent in the distal end hard portion 332.
- a pitch converter 333 that changes the distance (pitch) between the fibers.
- the first light receiving fiber 312, the second light receiving fiber 313, and the third light receiving fiber 314 have the same configuration.
- the pitch conversion part 333 connects the soft part 331 and the distal end hard part 332 so that the straight lines passing through the respective central axes do not coincide with each other.
- the pitch converting portion 333 may be, for example, linear and extend while being inclined with respect to the central axis of the soft portion 331, or by forming an arc shape, the soft portion 331 and the distal end hard portion 332 are formed. You may connect so that the straight line which passes each other's central axis may not correspond.
- tip hard part 332, the straight line which passes each other's central axis may correspond.
- the pitch conversion unit 333 if the inclination angle of the most inclined fiber among the first light receiving fiber 312, the second light receiving fiber 313, and the third light receiving fiber 314 is Deg_max, the fiber breakage is prevented.
- the inclination angle Deg_max satisfies the following conditional expression. In the following description, it is assumed that the pitch converting portion 333 is linear, and the inclination angle is an angle formed by the central axis of the distal end hard portion 332 and the pitch converting portion 333. 1.0 ⁇ Deg_max ⁇ 6.0 (1)
- the illumination fiber 311 covers a substantially rod-shaped core portion 311a (core) that propagates light and the outer periphery of the core portion 311a, and has an outer layer portion that has a smaller refractive index than the core portion 311a.
- a light propagation part 350 made of 311b (cladding), a first covering part 351 covering the side surface of the outer layer part 311b of the soft part 331 of the illumination fiber 311, and a light receiving side (the tip hard part 332 and the pitch conversion part 333) of the illumination fiber 311.
- a second covering portion 352 that covers the side surface of the outer layer portion 311b.
- the outer layer portion 311b is covered with the first covering portion 351 and the second covering portion 352 on the side surfaces. Further, the coating thickness D 1 of the outer portion 311b of the first covering portion 351, and the coating thickness D 2 of the outer layer portion 311b of the second cover part 352 are different, satisfy the relationship of D 2 ⁇ D 1.
- the first light receiving fiber 312, the second light receiving fiber 313, and the third light receiving fiber 314 have the same configuration.
- the refractive index of the core part 311a is larger than the refractive index of the outer layer part 311b, light is propagated mainly by the core part 311a.
- the length D A of the pitch converter 333 with respect to the coating thickness D 1 for preventing fiber breakage satisfies the following conditional expression.
- the length D A of the pitch conversion unit 333 is a length along the longitudinal direction of the distal end rigid portion 332 (the central axis of the fiber). 0.005 ⁇ D 1 / D A ⁇ 0.032 (2)
- the coating thicknesses D 1 and D 2 for preventing fiber breakage satisfy the following conditional expression. 15 ⁇ D 1 / D 2 ⁇ 100 ⁇ (3)
- the LEBS performed in the optical measurement system 1 described above is a diagnostic method using interference light
- the light to be irradiated on the measurement target is measured. It is necessary to make the spatial coherent length constant. For this reason, the illumination fiber 311, the first light receiving fiber 312, the second light receiving fiber 313, and the third light receiving fiber 314 satisfy the following conditional expressions.
- NA represents the numerical aperture of each of the illumination fiber 311 and the first light receiving fiber 312 to the third light receiving fiber 31
- D_core represents the core portion 311a of each of the illumination fiber 311 and the first light receiving fiber 312 to the third light receiving fiber 31
- D_clad represents the cladding diameter of the outer layer portion 311b of each of the illumination fiber 311 and the first light receiving fiber 312 to the third light receiving fiber 314.
- the core diameter D_core of the core portion 311a is in the range of 15 ⁇ m ⁇ D_core ⁇ 45 ⁇ m, it is possible to shorten the distance between the centers of the fiber core portions 311a while inputting / outputting an appropriate amount of light.
- the core diameter D_core of the core portion 311a and the cladding diameter D_clad of the outer layer portion 311b satisfy the relationship of 0.60 ⁇ D_core / D_clad ⁇ 0.75, the light propagating through the core portion 311a can be transmitted to the outer layer portion 311b.
- the increase in the diameter of the light propagation part 350 can be suppressed while preventing leakage from the outside.
- the inclination angle Deg_max of the pitch conversion part 333 of the most inclined fiber is 1.0 ⁇ . Since Deg_max ⁇ 6.0 is satisfied, fiber breakage during manufacturing can be prevented.
- the length D A of the pitch conversion unit 333 with respect to the coating thickness D 1 satisfies the relationship of 0.005 ⁇ D 1 / D A ⁇ 0.032 at the inclination angle Deg_max described above. Since it did in this way, the coating thickness D1 of the 1st coating
- the coating thicknesses D 1 and D 2 satisfy the relationship of 15 ⁇ D 1 / D 2 ⁇ 100, the inclination angle Deg_max, the first coating portion 351 and the second coating in a state filled with the ratio D 1 / D a and part 352, it is possible to realize the prevention of breaking more reliable fiber.
- the pitch conversion unit 333 has been described as having a linear shape.
- the inclination angle in the case of the arc shape is the end of the pitch conversion unit 333 on the soft portion 331 side and the hard tip portion.
- the angle formed by the line segment connecting the end portions on the 332 side and the central axis of the distal end hard portion 332 is set, and the largest of these is the inclination angle Deg_max.
- the first covering portion 351 and the second covering portion 352 are described as being provided on the outer layer portion 311b of the fiber. However, the conditional expressions (1) to (6) described above are used. If the above condition is satisfied, the second covering portion 352 may be omitted.
- the measurement probe 3 is described as having one illumination fiber 311. However, a configuration in which a plurality of illumination fibers is provided may be used.
- conditional expression (1) preferably, 1.5 ⁇ Deg_max ⁇ 5.5 (1) ′ It is.
- conditional expression (3) preferably, 20 ⁇ D 1 / D 2 ⁇ 80 (3) ′ And more preferably 24 ⁇ D 1 / D 2 ⁇ 63 ⁇ (3) " It is.
- conditional expression (4) preferably, 0.21 ⁇ NA ⁇ 0.23 (4) ′ It is.
- conditional expression (5) preferably, 20 ⁇ m ⁇ D_core ⁇ 30 ⁇ m (5) ′ And more preferably 23 ⁇ m ⁇ D_core ⁇ 27 ⁇ m (5) ” It is.
- conditional expression (6) preferably, 0.70 ⁇ D_core / D_clad ⁇ 0.73 (6) ′ It is.
- Measurement probes having fibers satisfying the above-described conditional expressions were produced as Examples 1 to 3, respectively.
- the following fiber units are composed of one irradiation fiber and three light receiving fibers as in the above-described embodiment, and the irradiation fibers and the light receiving fibers are arranged in a line at equal intervals. To do. At this time, the center of the arranged fiber units coincides with the center of the fiber.
- Example 1 A measurement probe having a fiber satisfying the following conditions was produced. In addition, nickel plating or gold plating was used for the first covering portion 351. An acrylic resin was used for the second covering portion 352.
- Covering thickness D 2 of outer layer portion 311b of second covering portion 352: D 2 1 ⁇ m
- the longitudinal direction of the soft portion 331 and the longitudinal direction of the distal end hard portion 332 are arranged in parallel, the soft portions 331 of each fiber are brought into contact with each other, and the distance between the distal end hard portions 332 is determined.
- the inclination angle Deg_max (conditional expression (1)) with respect to the longitudinal direction
- Example 2 A measurement probe having a fiber satisfying the following conditions was produced. In addition, nickel plating or gold plating was used for the first covering portion 351. An acrylic resin was used for the second covering portion 352.
- Covering thickness D 2 of outer layer portion 311b of second covering portion 352: D 2 2 ⁇ m
- the longitudinal direction of the soft part 331 and the longitudinal direction of the distal end hard part 332 are arranged in parallel, the soft parts 331 of each fiber are brought into contact with each other, and the distal end when the distance D P between the rigid portion 332 has a 2 [mu] m (see FIG.
- the inclination angle Deg_max (conditional expression (1)) with respect to the longitudinal direction of the dis
- Example 3 A measurement probe having a fiber satisfying the following conditions was produced. In addition, the fiber concerning Example 3 was not provided with the 1st coating
- the longitudinal direction of the soft part 331 and the longitudinal direction of the distal end hard part 332 are arranged in parallel, the soft parts 331 of each fiber are brought into contact with each other, and the distal end when the distance D P between the rigid portion 332 has a 2 [mu] m (see FIG.
- the inclination angle Deg_max conditional expression (1) with respect to the longitudinal direction of the distal end hard portion 332 of the pitch conversion portion 333 is determined
- the measurement probe when assembling the fiber unit having the fiber satisfying the above conditions (1) to (6), the measurement probe is not broken by contact or the like. We were able to make it. On the other hand, when assembled using a fiber unit that deviates from the range of the conditional expression described above, fiber breakage may occur due to contact or the like.
- the fiber unit according to the present invention is useful for preventing fiber breakage during manufacturing.
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Abstract
Description
1.0<Deg_max<6.0 ・・・(1)
0.005<D1/DA<0.032 ・・・(2)
15<D1/D2<100 ・・・(3)
0.20<NA<0.25 ・・・(4)
15μm<D_core<45μm ・・・(5)
0.60<D_core/D_clad<0.75 ・・・(6)
ただし、NAは、照明ファイバ311および第1受光ファイバ312~第3受光ファイバ314それぞれの開口数を表し、D_coreは、照明ファイバ311および第1受光ファイバ312~第3受光ファイバ314それぞれの芯部311aのコア径を表し、D_cladは、照明ファイバ311および第1受光ファイバ312~第3受光ファイバ314それぞれの外層部311bのクラッド径を表す。
1.5<Deg_max<5.5 ・・・(1)’
である。
また、条件式(3)において、好ましくは、
20<D1/D2<80 ・・・(3)’
であり、より好ましくは、
24<D1/D2<63 ・・・(3)”
である。
また、条件式(4)において、好ましくは、
0.21<NA<0.23 ・・・(4)’
である。
また、条件式(5)において、好ましくは、
20μm<D_core<30μm ・・・(5)’
であり、より好ましくは、
23μm<D_core<27μm ・・・(5)”
である。
また、条件式(6)においては、好ましくは、
0.70<D_core/D_clad<0.73 ・・・(6)’
である。
以下の条件となるファイバを有する測定プローブを作製した。なお、第1被覆部351には、ニッケルメッキまたは金メッキを使用した。第2被覆部352には、アクリル系樹脂を使用した。
第1被覆部351の外層部311bの被覆厚みD1:D1=63μm
第2被覆部352の外層部311bの被覆厚みD2:D2=1μm
ピッチ変換部333の長さDA:DA=2.0mm
D1/DA(条件式(2)):D1/DA=0.0315
D1/D2(条件式(3)):D1/D2=63
開口数NA(条件式(4)):NA=0.22
芯部311aのコア径D_core(条件式(5)):D_core=25μm
外層部311bのクラッド径D_clad:D_clad=34μm
コア径D_core/クラッド径D_clad(条件式(6)):D_core/D_clad≒0.74
先端硬質部332の径(μm):
D_clad(クラッド径)+D2(被覆厚み)×2=34+1×2=36(μm)
ファイバユニットの中心から最も外側の軟質部331の中心までの距離D3(μm):
D3=(D_clad+D1(被覆厚み)×2)×1.5
=(34+63×2)×1.5=243(μm)
ファイバユニットの中心から最も外側の先端硬質部332の中心までの距離D4(μm):
D4=(先端硬質部332の径×1.5)+DP×1.5
=(36×1.5)+2×1.5=57(μm)
最も外側の軟質部331の中心と先端硬質部332の中心との間の距離D5:
D5=D3-D4=243-57=186(μm)
ピッチ変換部333の長さDAと、距離D5とにより、ピッチ変換部333の先端硬質部332の長手方向に対する傾斜角度Deg_max(条件式(1))は、
Deg_max=Atan(D5/DA)
=Atan(0.186/2.0)≒5.31(度)
となる。
以下の条件となるファイバを有する測定プローブを作製した。なお、第1被覆部351には、ニッケルメッキまたは金メッキを使用した。第2被覆部352には、アクリル系樹脂を使用した。
第1被覆部351の外層部311bの被覆厚みD1:D1=48μm
第2被覆部352の外層部311bの被覆厚みD2:D2=2μm
ピッチ変換部333の長さDA:DA=6.0mm
D1/DA(条件式(2)):D1/DA=0.008
D1/D2(条件式(3)):D1/D2=24
開口数NA(条件式(4)):NA=0.224
芯部311aのコア径D_core(条件式(5)):D_core=21μm
外層部311bのクラッド径D_clad:D_clad=30μm
コア径D_core/クラッド径D_clad(条件式(6)):D_core/D_clad=0.70
先端硬質部332の径(μm):
D_clad(クラッド径)+D2(被覆厚み)×2=30+2×2=34(μm)
ファイバユニットの中心から最も外側の軟質部331の中心までの距離D3(μm):
D3=(D_clad+D1(被覆厚み)×2)×1.5
=(30+48×2)×1.5=189(μm)
ファイバユニットの中心から最も外側の先端硬質部332の中心までの距離D4(μm):
D4=(先端硬質部332の径×1.5)+DP×1.5
=(34×1.5)+2×1.5=54(μm)
最も外側の軟質部331の中心と先端硬質部332の中心との間の距離D5:
D5=D3-D4=189-54=135(μm)
ピッチ変換部333の長さDAと、距離D5とにより、ピッチ変換部333の先端硬質部332の長手方向に対する傾斜角度Deg_max(条件式(1))は、
Deg_max=Atan(D5/DA)
=Atan(0.135/6.0)≒1.3(度)
となる。
以下の条件となるファイバを有する測定プローブを作製した。なお、実施例3にかかるファイバには第1被覆部351を設けず、第2被覆部352にはアクリル系樹脂を使用した。
第1被覆部351の外層部311bの被覆厚みD1:D1=54μm
第2被覆部352の外層部311bの被覆厚みD2:D2=0μm
ピッチ変換部333の長さDA:DA=4.5mm
D1/DA(条件式(2)):D1/DA=0.012
D1/D2(条件式(3)):数値なし
開口数NA(条件式(4)):NA=0.222
芯部311aのコア径D_core(条件式(5)):D_core=26μm
外層部311bのクラッド径D_clad:D_clad=36μm
コア径D_core/クラッド径D_clad(条件式(6)):D_core/D_clad=0.72
先端硬質部332の径(μm):D_clad(クラッド径)=36(μm)
ファイバユニットの中心から最も外側の軟質部331の中心までの距離D3(μm):
D3=(D_clad+D1(被覆厚み)×2)×1.5
=(36+54×2)×1.5=216(μm)
ファイバユニットの中心から最も外側の先端硬質部332の中心までの距離D4(μm):
D4=(先端硬質部332の径×1.5)+DP×1.5
=(36×1.5)+2×1.5=57(μm)
最も外側の軟質部331の中心と先端硬質部332の中心との間の距離D5:
D5=D3-D4=216-57=159(μm)
ピッチ変換部333の長さDAと、距離D5とにより、ピッチ変換部333の先端硬質部332の長手方向に対する傾斜角度Deg_max(条件式(1))は、
Deg_max=Atan(D5/DA)
=Atan(0.159/4.5)≒2.0(度)
となる。
2 光学測定装置
3 測定プローブ
21 電源
22 光源部
23 接続部
24 受光部
25 入力部
26 出力部
27 記録部
28 制御部
28a 演算部
31 コネクタ部
32 可撓部
33 先端部
34 光学素子
100 内視鏡システム
110 内視鏡装置
111 処置具チャンネル
310 ファイバユニット
311 照明ファイバ
311a 芯部
311b 外層部
312 第1受光ファイバ
313 第2受光ファイバ
314 第3受光ファイバ
315 被覆部材
316 保護部
317 プローブ外皮
331 軟質部
332 先端硬質部
333 ピッチ変換部
350 光伝播部
351 第1被覆部
352 第2被覆部
Claims (6)
- 先端から光を入出力することによって光学的測定を行う測定プローブに設けられ、1または複数の照明用ファイバ、および複数の検出用ファイバを有するファイバユニットであって、
前記照明用ファイバおよび前記検出用ファイバは、
屈曲可能な軟質部と、
一端に設けられ、前記軟質部よりも高硬度の先端硬質部と、
前記軟質部と前記先端硬質部とを接続するとともに、屈曲して延びることによって、前記軟質部において隣接するファイバ間の距離に対し、前記先端硬質部において隣接するファイバ間の距離を変化させるピッチ変換部と、
を備え、
前記ピッチ変換部において前記軟質部側の端部および前記先端硬質部側の端部を結んだ線分と、前記先端硬質部の中心軸とがなす角度のうち、最も傾斜した角度をDeg_maxとしたとき、
1.0<Deg_max<6.0
を満たすことを特徴とするファイバユニット。 - 前記軟質部の側面を覆う第1被覆部を有し、
前記第1被覆部の被覆厚さをD1、前記ピッチ変換部の長さをDAとしたとき、
0.005<D1/DA<0.032
を満たすことを特徴とする請求項1に記載のファイバユニット。 - 前記先端硬質部および前記ピッチ変換部の側面を覆う第2被覆部を有し、
前記第2被覆部の被覆厚さをD2としたとき、
15<D1/D2<100
を満たすことを特徴とする請求項2に記載のファイバユニット。 - 前記照明用ファイバおよび前記検出用ファイバは、一列に配列されることを特徴とする請求項1に記載のファイバユニット。
- 前記照明用ファイバおよび前記検出用ファイバは、
光を伝播する芯部を有し、
前記芯部の径D_coreが、
15μm<D_core<45μm
を満たすことを特徴とする請求項1に記載のファイバユニット。 - 前記照明用ファイバおよび前記検出用ファイバは、
前記芯部の外周を覆い、前記芯部よりも屈折率の小さい外層部を有し、
前記芯部の径D_coreおよび前記外層部の径D_cladが、
0.60<D_core/D_clad<0.75
を満たすとともに、
前記照明用ファイバおよび前記検出用ファイバの開口数NAが、
0.20<NA<0.25
を満たすことを特徴とする請求項5に記載のファイバユニット。
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CN201380003529.2A CN103889301B (zh) | 2012-08-08 | 2013-05-10 | 光纤单元 |
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JP2013552777A JP5485480B1 (ja) | 2012-08-08 | 2013-05-10 | ファイバユニット |
US14/099,239 US9014517B2 (en) | 2012-08-08 | 2013-12-06 | Fiber unit |
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US201261680884P | 2012-08-08 | 2012-08-08 | |
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US14/099,239 Continuation US9014517B2 (en) | 2012-08-08 | 2013-12-06 | Fiber unit |
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WO2014024532A1 true WO2014024532A1 (ja) | 2014-02-13 |
Family
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US (1) | US9014517B2 (ja) |
EP (1) | EP2883489A4 (ja) |
JP (1) | JP5485480B1 (ja) |
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EP3100099B1 (en) | 2014-01-31 | 2020-07-01 | Magic Leap, Inc. | Multi-focal display system and method |
US9389424B1 (en) | 2014-04-02 | 2016-07-12 | Magic Leap, Inc. | Methods and systems for implementing a high resolution color micro-display |
CN107850784B (zh) | 2015-07-20 | 2021-06-01 | 奇跃公司 | 虚拟/增强现实系统中具有内向指向角度的准直光纤扫描仪设计 |
JP2018533061A (ja) | 2015-10-05 | 2018-11-08 | マジック リープ, インコーポレイテッドMagic Leap,Inc. | 仮想/拡張現実システムにおける光ファイバ走査のためのマイクロレンズコリメータ |
KR20230164249A (ko) | 2015-10-06 | 2023-12-01 | 매직 립, 인코포레이티드 | 역각 회절 격자를 가진 가상/증강 현실 시스템 |
EP3405820B1 (en) | 2016-01-20 | 2021-02-24 | Magic Leap, Inc. | Polarizing maintaining optical fiber in virtual/augmented reality system |
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- 2013-05-10 EP EP13827614.2A patent/EP2883489A4/en not_active Withdrawn
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EP2883489A1 (en) | 2015-06-17 |
US20140177266A1 (en) | 2014-06-26 |
JPWO2014024532A1 (ja) | 2016-07-25 |
EP2883489A4 (en) | 2016-04-20 |
US9014517B2 (en) | 2015-04-21 |
JP5485480B1 (ja) | 2014-05-07 |
CN103889301A (zh) | 2014-06-25 |
CN103889301B (zh) | 2016-04-20 |
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