WO2019130753A1 - Dispositif de source de lumière - Google Patents

Dispositif de source de lumière Download PDF

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Publication number
WO2019130753A1
WO2019130753A1 PCT/JP2018/039109 JP2018039109W WO2019130753A1 WO 2019130753 A1 WO2019130753 A1 WO 2019130753A1 JP 2018039109 W JP2018039109 W JP 2018039109W WO 2019130753 A1 WO2019130753 A1 WO 2019130753A1
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WIPO (PCT)
Prior art keywords
light
wavelength
current value
current
led
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PCT/JP2018/039109
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English (en)
Japanese (ja)
Inventor
典子 小平
哲史 田中
五十嵐　誠
陽一朗 坂上
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オリンパス株式会社
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Publication of WO2019130753A1 publication Critical patent/WO2019130753A1/fr

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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
    • A61B1/06—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 with illuminating arrangements
    • A61B1/0655—Control therefor
    • 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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
    • G02B23/24—Instruments or systems for viewing the inside of hollow bodies, e.g. fibrescopes
    • G02B23/26—Instruments or systems for viewing the inside of hollow bodies, e.g. fibrescopes using light guides

Definitions

  • the present invention relates to a light source device, and more particularly to a light source device used for observing a living tissue in a subject.
  • a semiconductor light emitting element such as an LED may be used as a light source for generating illumination light for illuminating a subject such as a living tissue in the subject.
  • Japanese Patent No. 5292379 discloses an endoscope apparatus having a configuration for emitting illumination light generated by a semiconductor light source from the tip of the endoscope insertion portion.
  • Japanese Patent No. 5292379 discloses a configuration in which a drive pulse input to a semiconductor light source is controlled by a predetermined control method.
  • Japanese Patent No. 529 2 379 does not particularly disclose a method that can solve the above-mentioned problems. Therefore, according to the configuration disclosed in Japanese Patent No. 5292379, an excessive burden may be imposed on the user who performs operations such as hemostasis treatment while confirming the bleeding source in the living tissue in the subject. There is a problem corresponding to the above-mentioned problem of.
  • the present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide a light source device capable of reducing a burden on a user who performs an operation while confirming a bleeding source in a living tissue in a subject.
  • a light source device is a light source device configured to supply illumination light for illuminating a region in a subject where blood has flowed out, and a current of a first current value is applied.
  • the illumination light of the first center wavelength is generated, and the center wavelength of the illumination light is higher than the first center wavelength as the applied current becomes smaller than the first current value.
  • a light emitting element configured to have a light emission characteristic that shifts to the short wavelength side, and a storage unit that stores control information that is information used to adjust the light amount according to the light emission characteristic of the light emitting element
  • the central wavelength of the illumination light is shorter than the first central wavelength based on the control information read from the storage unit when the light emission amount of the light emitting element is made smaller than the current light emission amount.
  • the current value of the current applied to the light emitting element is reduced with a second current value smaller than the first current value as a lower limit, and the central wavelength of the illumination light is the second To shift the current application period to the light emitting element while maintaining the current value of the current applied to the light emitting element at the second current value.
  • the current applying unit is configured to have a light emission characteristic that shifts to the short wavelength side, and a storage unit that stores control information that is information used to adjust the light amount according to the light emission characteristic of the light emitting element
  • the central wavelength of the illumination light is shorter than the first central wavelength based on the control
  • the figure for demonstrating an example of the signal supplied to LED, when the observation mode of the endoscope system which concerns on embodiment is set to special light observation mode.
  • the figure for demonstrating an example of the signal supplied to LED, when the observation mode of the endoscope system which concerns on embodiment is set to special light observation mode.
  • the figure for demonstrating an example of the signal supplied to LED when the observation mode of the endoscope system which concerns on embodiment is set to special light observation mode.
  • the figure for demonstrating an example of the signal supplied to LED when the observation mode of the endoscope system which concerns on embodiment is set to special light observation mode.
  • the figure for demonstrating an example of the signal supplied to LED when the observation mode of the endoscope system which concerns on embodiment is set to special light observation mode.
  • the figure for demonstrating an example of the signal supplied to LED when the observation mode of the endoscope system which concerns on embodiment is set to special light observation mode.
  • the endoscope system 1 is configured to be capable of being inserted into a subject, and to capture an object such as a living tissue present in the subject and to output an imaging signal.
  • a light source device 3 configured to supply illumination light used for observation of the subject through the light guide 7 disposed through the endoscope 2, and the endoscope 2, and
  • a processor 4 configured to generate and output an observation image or the like corresponding to the output imaging signal, and a display device 5 configured to display the observation image output from the processor 4 on a screen; have.
  • FIG. 1 is a diagram showing the configuration of the main part of the endoscope system according to the embodiment.
  • the endoscope 2 has an insertion portion 2a formed in an elongated shape that can be inserted into a subject, and an operation portion 2b provided on the proximal end side of the insertion portion 2a.
  • the endoscope 2 is connected to the processor 4 via, for example, a universal cable (not shown) in which signal lines used for transmitting various signals such as imaging signals output from the imaging unit 21 (described later) are incorporated. It is configured to be detachably connected.
  • the endoscope 2 is configured to be detachably connected to the light source device 3 via a light guide cable (not shown) in which at least a part of the light guide 7 is incorporated.
  • the distal end portion 2c of the insertion portion 2a includes an imaging unit 21 for imaging a subject such as living tissue in the subject, an emission end of the light guide 7, and illumination light transmitted by the light guide 7 to the subject And an illumination optical system 22 for emitting light.
  • the imaging unit 21 is configured to image return light from a subject irradiated with illumination light from the illumination optical system 22 and to output an imaging signal. Specifically, the imaging unit 21 receives an objective optical system 21 a configured to form an image of return light emitted from a subject irradiated with illumination light from the illumination optical system 22, and receives the return light. And an image pickup element 21b configured by arranging a plurality of pixels for imaging in a matrix in accordance with the image forming position of the objective optical system 21a.
  • the imaging device 21 b is configured to include an image sensor such as, for example, a CCD or a CMOS. Further, the imaging device 21 b is configured to perform an operation according to the control signal output from the processor 4. In addition, the imaging device 21 b is configured to generate an imaging signal by imaging the return light imaged by the objective optical system 21 a and to output the generated imaging signal to the processor 4.
  • an image sensor such as, for example, a CCD or a CMOS.
  • the imaging device 21 b is configured to perform an operation according to the control signal output from the processor 4.
  • the imaging device 21 b is configured to generate an imaging signal by imaging the return light imaged by the objective optical system 21 a and to output the generated imaging signal to the processor 4.
  • the operation unit 2 b is configured to have a shape that can be held and operated by the user. Further, the operation unit 2 b is provided with a scope switch 23 configured to include one or more switches capable of giving the processor 4 an instruction according to the user's input operation. Specifically, the scope switch 23 instructs, for example, to set (switch) the observation mode of the endoscope system 1 to either the white light observation mode or the special light observation mode according to the user's operation. An observation mode changeover switch (not shown) that can be used is provided.
  • the light source device 3 is configured to supply illumination light for illuminating a region from which blood has flowed out in the subject into which the insertion portion 2a is inserted. Further, the light source device 3 is configured to include a light emitting unit 31, a multiplexer 32, a condenser lens 33, and a light source control unit 34.
  • the light emitting unit 31 is configured to have a violet LED 31a, a blue LED 31b, a green LED 31c, an amber LED 31d, and a red LED 31e. That is, the light emitting unit 31 is configured to include a plurality of semiconductor light emitting elements.
  • the violet LED 31a is configured to generate violet narrow band light (hereinafter referred to as V light). Specifically, for example, as shown in FIG. 2, the violet LED 31a is configured to generate, as V light, a light whose center wavelength is set to around 415 nm and whose bandwidth is set to about 20 nm. .
  • the violet LED 31 a is configured to emit or extinguish light in response to the LED drive signal supplied from the light source control unit 34.
  • the violet LED 31 a is also configured to generate V light having a light emission amount corresponding to the LED drive signal supplied from the light source control unit 34.
  • FIG. 2: is a figure which shows an example of the wavelength zone
  • the blue LED 31 b is configured to generate blue narrow band light (hereinafter referred to as B light). Specifically, for example, as shown in FIG. 2, the blue LED 31b is configured to generate, as B light, light having a center wavelength set to around 460 nm and a bandwidth set to about 20 nm. There is. Further, the blue LED 31 b is configured to emit or extinguish light in accordance with the LED drive signal supplied from the light source control unit 34. The blue LED 31 b is configured to generate B light having a light emission amount corresponding to the LED drive signal supplied from the light source control unit 34.
  • FIG. 2: is a figure which shows an example of the wavelength zone
  • the green LED 31 c is configured to generate green narrow band light (hereinafter referred to as G light). Specifically, for example, as shown in FIG. 2, the green LED 31c is configured to generate, as G light, a light whose center wavelength is set to around 540 nm and whose bandwidth is set to about 20 nm. There is. Further, the green LED 31 c is configured to emit or extinguish light in response to the LED drive signal supplied from the light source control unit 34. The green LED 31 c is configured to generate G light having a light emission amount corresponding to the LED drive signal supplied from the light source control unit 34.
  • G light green narrow band light
  • the amber LED 31 d is configured to generate amber narrow band light (hereinafter referred to as A light). Specifically, for example, as shown in FIG. 2, the amber LED 31 d is configured to generate, as the A light, light having a center wavelength set to around 600 nm and a bandwidth set to about 20 nm. ing. Further, the amber LED 31 d is configured to emit or extinguish light in accordance with the LED drive signal supplied from the light source control unit 34. Further, the amber LED 31 d is configured to generate A light having a light emission amount corresponding to the LED drive signal supplied from the light source control unit 34.
  • a light amber narrow band light
  • the amber LED 31 d is configured to generate the A light of the central wavelength PWA when the current value of the LED drive signal supplied from the light source control unit 34 is the current value IA. Further, as the current value of the LED drive signal supplied from the light source control unit 34 becomes smaller than the current value IA, the amber LED 31 d shifts the central wavelength of the A light to a shorter wavelength side than the central wavelength PWA Light emission characteristics. That is, the amber LED 31d generates the A light of the central wavelength PWA when the current of the current value IA is applied, and the central wavelength of the A light as the applied current becomes smaller than the current value IA. Is shifted to a shorter wavelength side than the central wavelength PWA.
  • the central wavelength PWA may be within the wavelength range in which the absorption coefficient of the blood which has flowed out in the subject changes sharply, as exemplified later. Therefore, in the present embodiment, the case where the center wavelength PWA is 600 nm will be described as an example.
  • the red LED 31e is configured to generate red narrow band light (hereinafter referred to as R light). Specifically, for example, as shown in FIG. 2, the red LED 31e is configured to generate, as R light, light having a center wavelength set to around 630 nm and a bandwidth set to about 20 nm. There is. Further, the red LED 31 e is configured to emit or extinguish light in response to the LED drive signal supplied from the light source control unit 34. In addition, the red LED 31 e is configured to generate R light having a light emission amount according to the LED drive signal supplied from the light source control unit 34.
  • R light red narrow band light
  • the coupler 32 is configured to be able to combine the lights emitted from the light emitting unit 31 and to make the light enter the condensing lens 33.
  • the condenser lens 33 is configured to condense light incident through the coupler 32 and to emit the light to the light guide 7.
  • the light source control unit 34 is configured to include, for example, a control circuit and the like. Further, the light source control unit 34 is configured to drive each of the LEDs of the light emitting unit 31 in accordance with a control signal output from the processor 4.
  • the light source control unit 34 is configured to include a storage unit 34 a and a drive signal generation unit 34 b.
  • the storage unit 34a is configured to include, for example, a non-volatile memory and the like.
  • the storage unit 34a also stores light source control information which is information used to adjust the light amount according to the light emission characteristic of the amber LED 31d in the special light observation mode.
  • the above-mentioned light source control information includes information indicating the current value IL supplied to the amber LED 31d when the central wavelength of the A light is the central wavelength PWL less than PWA.
  • the current value IL may be set to be a value larger than the current value of the forward current that can be emitted by the amber LED 31 d.
  • the current value IL may be set to a different value in accordance with the individual optical characteristics of the amber LED 31d.
  • the central wavelength PWL may be within the wavelength range in which the light absorption coefficient of the blood which has flowed out in the subject changes sharply, as exemplified later. Therefore, in the present embodiment, the case where the central wavelength PWL is a predetermined wavelength belonging to the range of 591 nm or more and less than 600 nm will be described as an example.
  • the drive signal generation unit 34 b is configured to include, for example, a drive circuit and the like. Further, the drive signal generation unit 34 b has a function as a current application unit, and based on the control signal output from the processor 4 and the light source control information read from the storage unit 34 a, each LED of the light emission unit 31 is It is configured to generate and output an LED drive signal which is a pulse-like drive signal for driving. A specific example of the operation performed in the drive signal generation unit 34b will be described later.
  • each unit of the light source control unit 34 may be configured as an individual electronic circuit, or may be configured as a circuit block in an integrated circuit such as an FPGA (Field Programmable Gate Array). Good. Further, in the present embodiment, for example, the light source control unit 34 may be configured to include one or more CPUs.
  • the processor 4 is configured to include a signal processing unit 41, an image processing unit 42, an observation image generation unit 43, and a control unit 44.
  • the signal processing unit 41 includes, for example, a signal processing circuit and the like. Further, the signal processing unit 41 generates image data by performing predetermined signal processing such as A / D conversion on the imaging signal output from the endoscope 2, and generates the generated image data as an image processing unit. 42 and the control unit 44.
  • the image processing unit 42 is configured to include, for example, an image processing circuit and the like.
  • the image processing unit 42 performs predetermined image processing such as color balance adjustment processing on the image data output from the signal processing unit 41 in accordance with the control signal output from the control unit 44 to obtain an observation image generation unit It is configured to output to 43.
  • the observation image generation unit 43 is configured to include, for example, an image generation circuit and the like.
  • the observation image generation unit 43 receives the image data of each color component output through the image processing unit 42 according to the control signal output from the control unit 44 as R (red) channel, G (green) of the display device 5
  • the observation image is generated by assigning to the channel and the B (blue) channel, and the generated observation image is output to the display device 5.
  • the control unit 44 is configured to include, for example, a control circuit and the like. In addition, the control unit 44 is configured to generate and output a control signal for performing an operation according to the observation mode of the endoscope system 1 based on an instruction made in the observation mode switching switch of the scope switch 23 It is done. Further, the control unit 44 is configured to generate and output a control signal for controlling the operation of the imaging device 21b. The control unit 44 is also configured to generate and output control signals for controlling the operation of each LED of the light emitting unit 31 via the light source control unit 34.
  • the control unit 44 is configured to perform brightness detection processing for detecting the current brightness in the observation mode set in the scope switch 23 based on the image data output from the signal processing unit 41. In addition, the control unit 44 generates a control signal for performing a light adjustment operation to bring the current brightness obtained as a processing result of the above-described brightness detection process closer to a predetermined brightness target value. It is configured to output to the control unit 34.
  • each unit of the processor 4 may be configured as an individual electronic circuit, or may be configured as a circuit block in an integrated circuit such as an FPGA (Field Programmable Gate Array). Good. Further, in the present embodiment, for example, the processor 4 may be configured to include one or more CPUs.
  • the display device 5 includes, for example, an LCD (Liquid Crystal Display) or the like, and is configured to be able to display an observation image or the like output from the processor 4.
  • LCD Liquid Crystal Display
  • the observation mode changeover switch of the scope switch 23 is operated to make the observation mode of the endoscope system 1 white. Give an instruction to set the light observation mode.
  • the control unit 44 When it is detected that the instruction to set the observation mode of the endoscope system 1 to the white light observation mode is performed, the control unit 44 sequentially emits the B light, the G light, and the R light from the light source device 3 A control signal for causing the light source to be generated is output to the light source control unit 34.
  • the control unit 44 detects that an instruction to set the observation mode of the endoscope system 1 to the white light observation mode has been performed, the control unit 44 performs an operation according to the white light observation mode.
  • the drive signal generation unit 34 b generates a control signal and outputs the control signal to the image processing unit 42 and the observation image generation unit 43. In the white light observation mode, the drive signal generation unit 34 b responds to the control signal output from the control unit 44.
  • an LED drive signal for repeatedly emitting the blue LED 31b, the green LED 31c, and the red LED 31e in this order is generated, and the generated LED drive signal is output to the light emitting unit 31.
  • the B light, the G light, and the R light are sequentially emitted to the subject as illumination light, and the return light (reflected light) of the illumination light is captured.
  • the generated imaging signal is sequentially output from the imaging element 21b to the signal processing unit 41.
  • the signal processing unit 41 performs predetermined signal processing on the imaging signals sequentially output from the imaging element 21b, thereby capturing an image of blue component obtained by imaging return light from the subject irradiated with the B light.
  • Image data PB as data
  • image data PG as image data of green component obtained by imaging return light from the subject irradiated with G light
  • Image data PR which is image data of a red component obtained by imaging light is generated and output to the image processing unit 42 and the control unit 44, respectively.
  • the image processing unit 42 performs white balance adjustment processing on image data of each color component output through the signal processing unit 41, for example, in the white light observation mode according to the control signal output from the control unit 44.
  • the image data of each color component subjected to the white balance adjustment processing is output to the observation image generation unit 43.
  • the observation image generation unit 43 assigns, for example, the image data PB output through the image processing unit 42 to the B channel of the display device 5 according to the control signal output from the control unit 44
  • the white light observation image is assigned by assigning the image data PG output through the processing unit 42 to the G channel of the display device 5 and assigning the image data PR output through the image processing unit 42 to the R channel of the display device 5
  • the generated white light observation image is output to the display device 5.
  • the control unit 44 performs brightness detection processing for detecting the current brightness WCB in the white light observation mode based on the image data of each color component output from the signal processing unit 41.
  • the control unit 44 calculates an average value of pixel values of pixels included in the image data PB, PG, and PR output from the signal processing unit 41.
  • a process is performed to detect the calculated average value as the current brightness WCB in the white light observation mode.
  • the control unit 44 performs a control signal for performing a light adjustment operation to bring the current brightness WCB obtained as a processing result of the above-described brightness detection processing to the brightness target value WTB in the white light observation mode. It is generated and output to the light source control unit 34.
  • control unit 44 generates a control signal for performing a light adjustment operation such that the ratio of the current brightness WCB to the brightness target value WTB (WCB / WTB) approaches one. It outputs to the light source control unit 34.
  • the LED drive signal according to the control signal output from the control unit 44 is supplied from the drive signal generation unit 34 b to the light emission unit 31 and suitable for white light observation.
  • B light, G light and R light having a light amount are supplied from the light source device 3 to the endoscope 2 as illumination light.
  • the observation mode of the endoscope system 1 is set to the white light observation mode, for example, when a subject such as a living tissue is viewed with the naked eye
  • a white light observation image having a color tone substantially similar to the color tone is displayed on the display device 5.
  • the user inserts the insertion portion 2a into the inside of the subject while confirming the white light observation image displayed on the display device 5,
  • the tip 2c is disposed at a position where a desired subject (living tissue) present inside the subject falls within the observation field of the objective optical system 21a.
  • the user operates the observation mode switch of the scope switch 23 to issue an instruction to set the observation mode of the endoscope system 1 to the special light observation mode.
  • the user confirms a special light observation image (described later) displayed on the display device 5 and a desired subject (living tissue) Treatment such as resection.
  • the special light observation image displayed on the display device 5 while the treatment such as ablation is performed on the desired subject corresponds to the bleeding source generated according to the treatment.
  • An area may be included, and an area corresponding to blood that has flowed from the hemorrhage source to the surface of the desired subject.
  • the control unit 44 causes the light source device 3 to emit G light, A light, and R light when it is detected that an instruction to set the observation mode of the endoscope system 1 to the special light observation mode has been performed. Control signal is generated and output to the light source control unit 34.
  • the light source controller 34 controls the green LED 31 c, the amber LED 31 d, and the red LED 31 e in the special light observation mode according to the control signal output from the controller 44, for example, while quenching the violet LED 31 a and the blue LED 31 b. Control for emitting light repeatedly one by one is performed on the light emitting unit 31. Then, according to the operation of the light source control unit 34 as described above, G light, A light and R light are irradiated to the subject as illumination light, and an imaging signal generated by imaging the return light of the illumination light is The image sensor 21 b sequentially outputs the signal to the signal processing unit 41.
  • control for quenching the purple LED 31a and the blue LED 31b is performed, and the green LED 31c and the red
  • the control for simultaneously emitting the two LEDs 31 e and the control for independently emitting the amber LED 31 d may be repeatedly performed.
  • the signal processing unit 41 performs predetermined signal processing on the imaging signals sequentially output from the imaging element 21b to obtain image data PG and light obtained by imaging the return light from the subject irradiated with the A light.
  • the image data PA which is the image data of the fading component, and the image data PR are generated and output to the image processing unit 42 and the control unit 44, respectively.
  • the image processing unit 42 performs, for example, color balance adjustment processing on image data of each color component output through the signal processing unit 41 according to a control signal output from the control unit 44.
  • the image data of each color component subjected to the color balance adjustment processing is output to the observation image generation unit 43.
  • the observation image generation unit 43 assigns, for example, the image data PG output through the image processing unit 42 to the B channel of the display device 5 according to the control signal output from the control unit 44
  • the special light observation image is assigned by assigning the image data PA output through the processing unit 42 to the G channel of the display device 5 and assigning the image data PR output through the image processing unit 42 to the R channel of the display device 5 Are generated, and the generated special light observation image is output to the display device 5.
  • the control unit 44 performs brightness detection processing for detecting the current brightness SCB in the special light observation mode based on the image data of each color component output from the signal processing unit 41.
  • control unit 44 calculates an average value of pixel values of respective pixels included in the image data PG, PA, and PR output from the signal processing unit 41.
  • a process is performed to detect the calculated average value as the current brightness SCB in the special light observation mode.
  • the control unit 44 performs a light control operation for causing the current brightness SCB obtained as a processing result of the brightness detection process described above to approach the brightness target value STB in the special light observation mode. It is generated and output to the light source control unit 34.
  • control unit 44 generates a control signal for performing a dimming operation such that the ratio of the current brightness SCB to the brightness target value STB (SCB / STB) approaches one. It outputs to the light source control unit 34.
  • the brightness target value STB may change, for example, according to the observation distance VD corresponding to the distance between the subject and the tip 2c. Therefore, according to the operation of the control unit 44 as described above, the light control is performed such that the emitted light amount of the green LED 31c, the amber LED 31d and the red LED 31e becomes larger than the current emitted light amount as the observation distance VD increases. The action is taken. Further, according to the operation of the control unit 44 as described above, the light control is performed such that the emitted light amount of the green LED 31c, the amber LED 31d and the red LED 31e becomes smaller than the current emitted light amount as the observation distance VD decreases. The action is taken.
  • the drive signal generation unit 34b reads the light source control information stored in the storage unit 34a in the special light observation mode, and controls the current value IL included in the read light source control information and the control output from the control unit 44. Based on the signal, the light control operation is performed to adjust the amount of light emitted from the green LED 31c, the amber LED 31d, and the red LED 31e of the light emitting unit 31, respectively.
  • the light control operation performed when adjusting the light emission amount of the amber LED 31d will be described as a representative example. That is, the specific example described below is applied substantially similarly to the light control operation performed when adjusting the light emission amount of the green LED 31c, and the light control operation performed when adjusting the light emission amount of the red LED 31e. Ru.
  • the drive signal generation unit 34 b In the special light observation mode, the drive signal generation unit 34 b generates an LED drive signal for setting the light emission amount according to the control signal output from the control unit 44 and outputs the generated LED drive signal to the amber LED 31 d Operation to obtain the current value IC of the Then, according to the operation of such a drive signal generation unit 34b, for example, a pulse signal as shown in FIG. 3 is supplied as the LED drive signal to the amber LED 31d, and the current value IC of the LED drive signal is acquired Be done.
  • FIG. 3 is a view for explaining an example of a signal supplied to the LED when the observation mode of the endoscope system according to the embodiment is set to the special light observation mode.
  • the drive signal generation unit 34b performs a light control operation to make the emitted light amount of the amber LED 31d smaller than the current emitted light amount based on the current value IC, the current value IL, and the control signal output from the control unit 44. If it is performed, processing is performed to determine whether or not the current value IC is reduced to the current value IL.
  • the drive signal generation unit 34b determines the light emission amount according to the control signal output from the control unit 44. An operation is performed to generate an LED drive signal in which the current value IC is decreased with the current value IL as the lower limit, and the generated LED drive signal is supplied to the amber LED 31d. That is, when the light emission amount of the amber LED 31d is smaller than the current light emission amount, the drive signal generation unit 34b determines that the central wavelength of the A light is shorter than the central wavelength PWA based on the light source control information read from the storage unit 34a.
  • FIG.4 and FIG.5 is a figure for demonstrating an example of the signal supplied to LED, when the observation mode of the endoscope system which concerns on embodiment is set to special light observation mode.
  • the drive signal generation unit 34b When the drive signal generation unit 34b obtains the determination result that the current value IC is reduced to the current value IL, the drive signal generation unit 34b maintains the current value IL and responds to the control signal output from the control unit 44.
  • the LED drive signal is generated by reducing any of the number of pulses, the pulse density and the pulse width so as to become the emitted light amount, and the generated LED drive signal is supplied to the amber LED 31d. That is, the drive signal generation unit 34b shifts the central wavelength of the A light to the central wavelength PWL based on the light source control information read from the storage unit 34a when making the emitted light amount of the amber LED 31d smaller than the current emitted light amount.
  • an operation for reducing the application period of the current to the amber LED 31 d is performed.
  • a pulse signal having a smaller number of pulses than the pulse signal of FIG. 5 is supplied to the amber LED 31d as an LED drive signal.
  • Ru is supplied to the amber LED 31d as an LED drive signal.
  • FIG.6 is a figure for demonstrating an example of the signal supplied to LED, when the observation mode of the endoscope system which concerns on embodiment is set to special light observation mode.
  • the A light in the object is irradiated.
  • the three factors of difference in the oxygen saturation of the blood that has flowed out to the surface of the subject (living tissue), the difference in the thickness of the blood, and the difference in the concentration of the blood are assumed. ing.
  • the difference in the above-mentioned oxygen saturation of blood is, for example, the brightness of the image data PA according to the outflow state of arterial blood and venous blood which has flowed out on the surface of the subject (living tissue) irradiated with A light in the subject.
  • the area to which arterial blood is flowing out of the subject (body tissue) to which A light is applied has a relatively low light absorption coefficient near 600 nm, and thus image data It is visualized as a bright area in PA.
  • the region out of which the venous blood flows out of the subject (living tissue) to which the A light is applied has a relatively high light absorption coefficient near 600 nm as shown in FIG.
  • FIG. 9 is a diagram for explaining the difference in light absorption characteristics according to the difference in the oxygen saturation of blood.
  • the difference in the thickness of the blood described above is, for example, the image data PA corresponding to the width of the blood layer formed by the blood which has flowed out and accumulated on the surface of the subject (living tissue) to which the A light in the subject is irradiated. It is visualized as a difference in brightness. Specifically, the region where the width of the blood layer is relatively small in the subject (living tissue) to which the A light is applied has a relatively low absorbance, so it is visualized as a high brightness region in the image data PA. Be done.
  • the region (region including the bleeding source) in which the width of the blood layer is relatively large in the subject (living tissue) to which the A light is irradiated has relatively high absorbance, so the low luminance in the image data PA Is visualized as an area of interest. Then, in order to maintain the state in which the difference in blood thickness is visualized as the difference in brightness of the image data PA, the region where the thickness of the blood layer is relatively small can be visualized as a high brightness region from around 580 nm For the change of the central wavelength of A light so that the wavelength on the long wavelength side and the wavelength on the short wavelength side from around 600 nm that can be visualized as a low brightness region where the thickness of the blood layer is relatively large will be used. It is necessary to perform the light control operation according to it.
  • the light absorption coefficient of blood is relatively small, so the thickness of the blood layer is relatively large. Even, it can be visualized as a high brightness area in the image data PA. Therefore, in such a case, it is difficult to identify the bleeding source due to the decrease in the contrast between the region where the thickness of the blood layer is relatively small and the region where the thickness of the blood layer is relatively large. May be
  • the difference in the above-mentioned blood concentration may be, for example, an image according to the degree to which the blood that has flowed out onto the surface of the subject (living tissue) to be irradiated with A light in the subject is diluted with a liquid other than blood such as water. It is visualized as the difference in brightness of the data PA.
  • a region with a relatively high degree of diluted blood in the subject (living tissue) to which A light is applied has a relatively low absorbance, and thus a high luminance region in image data PA It is visualized as Further, the region (region including the bleeding source) having a relatively low degree of blood dilution in the subject (living tissue) to which the A light is applied has a relatively high absorbance, so that the image data PA It is visualized as a low brightness area.
  • the region where the blood concentration is relatively low can be visualized as a high brightness region longer than around 580 nm A wavelength according to the change of the central wavelength of A light so that a wavelength on the wavelength side and a wavelength on the short wavelength side from around 600 nm that can be visualized as a region with relatively high blood concentration as a low luminance region continues to be used It is necessary to perform dimming operation.
  • the light absorption coefficient of blood is relatively large, so the blood concentration is relatively low. Can also be visualized as low brightness areas in the image data PA. Therefore, in such a case, it may be difficult to identify the bleeding source due to the decrease in the contrast between the region where the blood concentration is relatively low and the region where the blood concentration is relatively high. There is.
  • the light absorption coefficient of blood is relatively small, so the blood concentration is relatively high. Can also be visualized as high brightness areas in the image data PA. Therefore, in such a case, it may be difficult to identify the bleeding source due to the decrease in the contrast between the region where the blood concentration is relatively low and the region where the blood concentration is relatively high. There is.
  • the bleeding source and the bleeding in the special light observation image displayed on the display device 5 are considered in consideration of the above three factors. It has been found that the contrast with a place other than the source can be optimized.
  • light source control information including the current value IL supplied to the amber LED 31d when the central wavelength of the A light is the central wavelength PWL is stored in advance in the storage unit 34a. I am trying to store it.
  • the current value of the LED drive signal supplied to the amber LED 31d After the current value IL is reduced, the light control operation is performed so that any one of the pulse number, pulse density and pulse width of the LED drive signal is reduced while maintaining the current value IL. There is.
  • the present embodiment it is possible to ensure a contrast capable of visually discriminating between the bleeding source and the portion other than the bleeding source in the special light observation image displayed on the display device 5, and as a result, It is possible to reduce the burden on the user who works while confirming the bleeding source in the living tissue in the sample.
  • the present embodiment is applied substantially similarly even when the A light has a central wavelength PWA different from 600 nm.
  • a spectral detector capable of detecting the central wavelength PWC of the A light emitted from the amber LED 31d is provided in the vicinity of the amber LED 31d and the central wavelength
  • light source control information including information indicating PWL is stored in the storage unit 34a, based on the light source control information read from the storage unit 34a and the detection result of the central wavelength PWC by the spectral detector.
  • a light control operation may be performed to make the light emission amount of the amber LED 31d smaller than the current light emission amount. Then, according to such a light adjustment operation, for example, before the central wavelength PWC of the A light detected by the spectral detector shifts to PWL, either one of FIG. 3, FIG. 4 and FIG.
  • the pulse signal is supplied to the green LED 31c, the amber LED 31d and the red LED 31e as an LED driving signal. Further, according to the light adjustment operation as described above, for example, after the central wavelength PWC of the A light detected by the spectral detector is shifted to PWL, one of FIG. 6, FIG. 7 and FIG. Corresponding pulse signals are respectively supplied to the green LED 31c, the amber LED 31d and the red LED 31e as LED drive signals. That is, in the present embodiment, either the information indicating the current value IL or the information indicating the center wavelength PWL may be included in the light source control information stored in the storage unit 34a.

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Abstract

La présente invention concerne un dispositif de source de lumière, qui comprend : un élément d'émission de lumière qui, lorsqu'un courant ayant une première valeur de courant est appliqué, génère une lumière d'éclairage ayant une première longueur d'onde centrale et décale la longueur d'onde centrale de la lumière d'éclairage vers une longueur d'onde plus courte alors que le courant appliqué devient plus petit ; une unité de stockage pour stocker des informations de commande destinées à être utilisées pour ajuster la quantité de lumière telle que demandée par des caractéristiques d'émission de lumière de l'élément d'émission de lumière ; et une unité d'application de courant. Lorsque la quantité d'émission de lumière par l'élément d'émission de lumière doit être réduite, l'unité d'application de courant : réduit la valeur de courant du courant appliqué à l'élément d'émission de lumière jusqu'à une seconde valeur de courant sur la base des informations de commande avant que la longueur d'onde centrale de la lumière d'éclairage ne se décale vers une seconde longueur d'onde centrale ; et après que la longueur d'onde centrale de la lumière d'éclairage se décale vers la seconde longueur d'onde centrale, réduit la durée de l'application de courant à l'élément d'émission de lumière tout en maintenant la valeur de courant du courant appliqué à l'élément d'émission de lumière à la seconde valeur de courant.
PCT/JP2018/039109 2017-12-27 2018-10-19 Dispositif de source de lumière WO2019130753A1 (fr)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001144332A (ja) * 1999-11-12 2001-05-25 Sharp Corp Ｌｅｄ駆動方法およびｌｅｄ装置ならびにｌｅｄランプ、ｌｅｄランプ駆動方法と表示装置
JP2004335853A (ja) * 2003-05-09 2004-11-25 Nichia Chem Ind Ltd フレキシブル半導体発光装置
JP2010509765A (ja) * 2006-11-10 2010-03-25 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ 発光装置を駆動させる駆動値を決定する方法及び装置
JP2012509098A (ja) * 2008-11-18 2012-04-19 ストライカー・コーポレーション フィードバック制御を行う内視鏡光源システム及びその内視鏡光源システムの同期方法
JP2014233344A (ja) * 2013-05-31 2014-12-15 Hoya株式会社 光学フィルタ素子、波長可変光バンドパスフィルタモジュール、波長可変光源装置及び分光内視鏡装置
WO2017062889A1 (fr) * 2015-10-08 2017-04-13 Ostendo Technologies, Inc. Dispositif émetteur de lumière à semi-conducteur à base de iii-nitrure ayant une émission de lumière ambre-à-rouge (> 600 nm) et procédé de fabrication

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001144332A (ja) * 1999-11-12 2001-05-25 Sharp Corp Ｌｅｄ駆動方法およびｌｅｄ装置ならびにｌｅｄランプ、ｌｅｄランプ駆動方法と表示装置
JP2004335853A (ja) * 2003-05-09 2004-11-25 Nichia Chem Ind Ltd フレキシブル半導体発光装置
JP2010509765A (ja) * 2006-11-10 2010-03-25 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ 発光装置を駆動させる駆動値を決定する方法及び装置
JP2012509098A (ja) * 2008-11-18 2012-04-19 ストライカー・コーポレーション フィードバック制御を行う内視鏡光源システム及びその内視鏡光源システムの同期方法
JP2014233344A (ja) * 2013-05-31 2014-12-15 Hoya株式会社 光学フィルタ素子、波長可変光バンドパスフィルタモジュール、波長可変光源装置及び分光内視鏡装置
WO2017062889A1 (fr) * 2015-10-08 2017-04-13 Ostendo Technologies, Inc. Dispositif émetteur de lumière à semi-conducteur à base de iii-nitrure ayant une émission de lumière ambre-à-rouge (> 600 nm) et procédé de fabrication

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