EP2089752A1 - Système endoscopique à éclairage par fluorescence à pompage de fibres - Google Patents

Système endoscopique à éclairage par fluorescence à pompage de fibres

Info

Publication number
EP2089752A1
EP2089752A1 EP07819267A EP07819267A EP2089752A1 EP 2089752 A1 EP2089752 A1 EP 2089752A1 EP 07819267 A EP07819267 A EP 07819267A EP 07819267 A EP07819267 A EP 07819267A EP 2089752 A1 EP2089752 A1 EP 2089752A1
Authority
EP
European Patent Office
Prior art keywords
endoscopic system
fluorescent body
light
glass fiber
optical
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP07819267A
Other languages
German (de)
English (en)
Inventor
Beat Krattiger
Martin Klumpp
Manfred Kuster
Marcel JÄGGLI
Sabrina LE DONNE-BRECHBÜHL
Fritz Hensler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Storz Endoskop Produktions GmbH Germany
Original Assignee
Storz Endoskop Produktions GmbH Germany
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Storz Endoskop Produktions GmbH Germany filed Critical Storz Endoskop Produktions GmbH Germany
Priority to EP11002427A priority Critical patent/EP2336818A1/fr
Publication of EP2089752A1 publication Critical patent/EP2089752A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • G02B23/2407—Optical details
    • G02B23/2461—Illumination
    • G02B23/2469—Illumination using optical fibres
    • 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
    • A61B1/00064—Constructional details of the endoscope body
    • A61B1/00071—Insertion part of the endoscope body
    • A61B1/0008—Insertion part of the endoscope body characterised by distal tip features
    • A61B1/00096—Optical elements
    • 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
    • A61B1/00064—Constructional details of the endoscope body
    • A61B1/00071—Insertion part of the endoscope body
    • A61B1/0008—Insertion part of the endoscope body characterised by distal tip features
    • A61B1/00101—Insertion part of the endoscope body characterised by distal tip features the distal tip features being detachable
    • 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
    • A61B1/00174—Optical arrangements characterised by the viewing angles
    • A61B1/00177—Optical arrangements characterised by the viewing angles for 90 degrees side-viewing
    • 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
    • A61B1/0615—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 for radial illumination
    • 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
    • A61B1/063—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 for monochromatic or narrow-band illumination
    • 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
    • A61B1/0653—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 with wavelength conversion
    • 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
    • A61B1/07—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 using light-conductive means, e.g. optical fibres
    • 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
    • A61B1/0638—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 providing two or more wavelengths
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B2207/00—Coding scheme for general features or characteristics of optical elements and systems of subclass G02B, but not including elements and systems which would be classified in G02B6/00 and subgroups
    • G02B2207/113—Fluorescence

Definitions

  • the invention relates to an endoscopic system having the features of the preamble of claims 1 and 13.
  • a lighting device is known, in which the light of a semiconductor laser is irradiated in an optical glass fiber.
  • the glass fiber consists of a high refractive index photoconductive core, a low refractive index cladding and a protective layer. Fluorescent dyes are embedded in the protective layer.
  • the semiconductor laser emits in the spectral range 380-460 nm.
  • the protective layer By discontinuities and impurities in the core and / or in the core / cladding boundary layer, part of the light is coupled out into the protective layer.
  • the impurities can be introduced from the outside at a defined location.
  • the decoupling can also be achieved by bending the glass fiber.
  • the fluorescent dyes in the protective layer convert blue light of the semiconductor laser into yellow light. Another part of the decoupled blue light penetrates the protective layer and adds up with the yellow component to white light.
  • the white light is emitted over the entire length of the glass fiber, which is provided with the protective layer and at which Auskoppelstörstellen are present.
  • the device is intended essentially for lighting in display panels or for the representation of ornaments.
  • JP 2005-205 195 A1 A further development of the principle of white light generation by additive color mixing of blue laser light and yellow light components produced in a fluorescence converter is known from JP 2005-205 195 A1.
  • the light emitted by an LED or a laser diode (LD) in the blue spectral range is transmitted through a
  • Condenser array fed into a thin multimode glass fiber The other end of the glass fiber is provided with a wavelength conversion element.
  • This consists of the core of the glass fiber and a fluorescent material surrounding the tip of the glass fiber. Because of the white light generation concentrated at the tip of the optical fiber, the embodiment is particularly suitable for endoscopic applications. By selecting the laser emission wavelengths and the composition of the fluorescent material, a variety of color gradations in the fluorescence conversion and color mixing is possible.
  • An optical device with white light generation at the distal end of the glass fiber was manufactured by the company Nichia Corp. Presented at the "Laser 2005" trade fair in Kunststoff, Germany, a blue laser diode feeds shortwave, bluish light with a wavelength of 405 or 445 nm into a thin multimode glass fiber
  • Fluorescence converter that transmits part of the blue light and diffuses it.
  • the other part of the bluish light is converted by the fluorescent dye into yellowish light and also diffused. Together with the directly transmitted blue light component, a white light is created by additive light mixing. Special emphasis was placed on an exact matching of the dyes and the scattering, so that the light acts as neutral as possible.
  • Due to the fiber end coating comprising the fluorescence converter the light emission takes place in an angular range of virtually 360 °.
  • the glass fiber can be introduced with the coated head part for illumination in cavities, as long as the resulting in the fluorescence conversion heat can be radiated without damage into the cavity.
  • an adapter for endoscopes is known in which a fluorescent body is used.
  • the adapter can be placed on the distal end of the endoscope so that the fluorescent body of the exit surface of an illumination fiber is opposite.
  • suitable shaping of the fluorescent body and coating of its outer surface can be achieved that the excitation light can enter the fluorescent body and the fluorescent light is reflected in the direction of the front surface of the fluorescent body.
  • the front surface can be provided with a transparent protective layer.
  • Newer laser light sources are offered with ever-increasing power output. This leads to an increase in the thermal load of the fluorescence converter, whereby its life is reduced.
  • the thermal stability of the fluorescence converter can be increased by the transition from organic to inorganic fluorescent components. However, this leads to an even higher heat radiation at higher light emission.
  • the concept of this white light generation by mixing a remainder of the blue excitation light with the fluorescent light is similar to that of the well-known white light LEDs.
  • the fluorescent dyes are applied to these LEDs directly on the blue glowing LED chip. Unfortunately, these white light LEDs have the big disadvantage that they currently have about only 1 to 3 times the efficiency of electrical energy (watts) to radiated light (lumens) such as halogen lamps.
  • the invention has for its object to make the principle of the known white light generation in endoscopic systems for lighting and measuring beams with essentially forward or targeted sideways directed light emission available and a heat load of the fluorescence converter, the
  • miniaturization of light reflectors and beam shaping optics is of particular importance in endoscopy. If an efficient beam shaping is required, the fluorescence body must be as small as possible from the optical geometry considerations with respect to the reflector or the beam shaping optics. However, this miniaturization inevitably increases the heat concentration and the destructive temperature gradient. For these reasons, the reduction of thermal resistances in and around the fluorescent body is important. In the subclaims concepts are mentioned, as can be achieved in miniaturized fluorescent bodies.
  • fluorescence body is also intended to include its property as a scattering body for scattering the transmitted excitation light.
  • the scattering is caused by the scattering centers incorporated in the volume of the fluorescent body and by structural effects on the surface, whereby the scattering centers can simultaneously be the fluorophores due to their dimensioning, selectively scatter the short wavelengths preferentially.
  • FIGS. 1 shows an endoscopic system with lighting fixture
  • 4 shows a replaceable head with quasi punctiform fluorescence body
  • 5 shows the replaceable head according to FIG. 4 with focused excitation beam
  • FIG. 6 shows the replaceable head according to FIG. 4 with collimated excitation beam.
  • 7a shows a larger fluorescence body in a replaceable head with sideways illumination and observation,
  • FIG. 8 shows the replaceable head according to FIG. 1a additionally with parallel measuring beam bundles, FIG.
  • FIG.9b the same arrangement in addition with video camera and electrical contacts.
  • 1 shows schematically an endoscopic system 1 with eyepiece 2 and insertion part 3.
  • the insertion part 3 can be designed as a rigid tube or flexible.
  • a video camera with representation of the observed image can also be provided on a monitor.
  • an excitation radiation source 5 is arranged, which contains a laser diode 6 and a coupling optics 7 for feeding the excitation light into a glass fiber 8.
  • additional laser diodes with emission of additional wavelengths whose radiation can also be fed into the glass fiber 8 or in additional glass fibers.
  • spectral weaknesses of the white light can be compensated.
  • the laser diodes may be battery operated or powered by a power supply.
  • a fiber-optic cable 9 is provided, which is connected via special or commercially available connectors on the endoscope and the supply unit 4.
  • the connectors can be designed in particular autoclavable and laser-protected.
  • the glass fiber 8 is guided in the usual way loosely or in a separate illumination channel or in a protective sheath to the distal end.
  • a lighting fixture 10 is arranged, in which the conversion into white light and the beam shaping for illuminating the object space or for projection of a measuring radiation take place.
  • the lighting fixture 10 is functionally replaceable or integrated into a replaceable replaceable head at the distal end of the insertion part 3.
  • the imaging optics is not shown here.
  • Fig. 2 shows a variant of the lighting fixture 10 in detail.
  • the glass fiber 8 and a fluorescent body 12 are used.
  • the socket 11 is made of a metal, such as silver, copper or aluminum, for example, and conducts the heat well, which arises in the fluorescent body 12.
  • the cross-section of the unprocessed, consisting of cladding, sheath and core glass fiber 8 is about 80-900 microns and about 5-900 microns on thinned as needed, introduced into the socket 11 distal end 8a. The thinning improves the heat dissipation to the proximal.
  • the glass fiber can also be used with its full cross section in the socket 11.
  • the light exit opening 13 of the socket 11 widens in a funnel shape, for example in a cone shape from proximal to distal.
  • a beam-shaping optical element 14 is used in the cone-shaped part of the light exit opening 13.
  • various parameters are to be considered. Generally, in the illumination optical system is known that the ratio of the optical diameter (reflector, lens, lens) to the source diameter (filament, arc, LED chip, fiber end) is crucial for the possibility of
  • the white light source is formed by the fluorescent body 12. Its smallest possible size depends in principle on at least four properties of the fluorescent material, namely the temperature resistance, the thermal conductivity, the light resistance and the optical density. All four of these material properties should be as high as possible. In order to perform the construction of the fluorescent body 12 as punctiform as possible, an efficient heat dissipation must be given. Optimally, therefore, a vitreous or transparent ceramic fluorescent body 12 is selected, which consists of reasons of temperature resistance only of inorganic parts.
  • the inorganic, bound in the fluorescent body 12 fluorophores must be lightfast, so that they can convert high irradiated light intensities without prejudice.
  • the fluorophores and their concentration should be chosen so that no or only a small saturation by quenching occurs.
  • the glass fiber diameter is to be limited by machining to the optically necessary minimum, which is represented by the thinning.
  • the light color and the light distribution arise in the illustrated construction directly in and near the fluorescent body 12, but overall in the lighting fixture 10.
  • This allows a modularity in the construction of the endoscopic system 1, by matching the lens and the fitting lighting fixture 10, consisting of fluorescent body 12 can be selected with version 11 and beam shaping optics 14 during assembly.
  • the fluorescent body 12 is enclosed between two transparent panes 15 of a good heat-conducting material, eg a crystal or a transparent ceramic.
  • a good heat-conducting material eg a crystal or a transparent ceramic.
  • sapphire or diamond is chosen, with which the fluorescent body 12 can dissipate all its heat efficiently.
  • the fluorescent body 12 is formed from transparent ceramics doped with fluorescence centers, doped sapphire or diamond, since then heat source and heat conductor largely coincide.
  • one or both of the heat-dissipating discs 15 can be dispensed with.
  • the heat dissipating discs 15 may also have optically imaging, scattering, reflective or diffractive properties.
  • the socket 11 of the lighting fixture 10 may also be advantageously made of a special aluminum alloy, e.g. Pure aluminum, be made so that it is possible in a simple manner, the surface of the cone-shaped light exit opening 13 to make highly reflective. If the socket 11 is e.g. is made of copper, the cone-shaped light exit opening 13 may also be silvered or coated with aluminum.
  • optics 14 (lens array, prism array, diffuser, diffractive optical
  • Element, aspherical lens, etc. forms the illumination beam, for example, round or square and adjusts the angle of radiation to a not shown here observation lens.
  • Essential to this is the hollow cone angle of the version 11.
  • Important is the hollow cone in particular in the immediate vicinity of the fluorescent body 12. From a distance of about 2-1Ox the diameter of the fluorescent body 12 can be dispensed with the conical shape and the resulting reflection direction.
  • other curved shapes such as parabola, ellipse, hyperbola, etc. are possible.
  • Such forms should generally be referred to as funnel-shaped.
  • the fluorescent body 12 is shown in FIGS. 2 and 3 as a component with trapezoidal or rectangular longitudinal section and inserted into a correspondingly shaped recess in the cone-shaped part of the light exit opening 13 of the socket 11.
  • the outer surface of the fluorescent body 12 may be provided with a solderable, metallic coating, e.g. Nickel, gold, titanium, silver, be provided. This allows a solid solder joint with good heat transfer to the version 11.
  • a solderable, metallic coating e.g. Nickel, gold, titanium, silver
  • the attachment of the fluorescent body 12 can also be done by clamping, whereby an exchange is facilitated.
  • the fluorescent light generated within the fluorescent body 12 is radiated in all directions, it is advantageous to adapt the lateral surface to the cone shape of the light exit opening 13 and to reflect it before insertion. This promotes forward radiation from the fluorescent body 12 and avoids light leakage through backward scattering.
  • the florescent body 12 can also be constructed from a plurality of cascade layers containing different fluorescent dyes. By varying the respective layer thickness, the color spectrum can be influenced.
  • the layer thickness can advantageously be thinner in a simple manner by a number Slices are modularly assembled. This allows a quick and easy adjustment of the color spectrum to a standard in the assembly. This is particularly helpful when the preparation of the fluorescent body 12 or the fluorescent discs is not reproducible and subject to fluctuations in the spectrum.
  • the concept of the quasi-point light source can also be realized with a replaceable head 16 coupled to the distal end of the insertion tube 3.
  • Fig. 4 shows an embodiment in which a small, quasi point-like fluorescent body 12 on a good heat-conducting window 15, e.g. a transparent ceramic, sapphire or diamond disc is arranged.
  • the replaceable head 16 is pushed in the direction of the arrow on the distal end of the insertion part 3, so that the light exit surface of the glass fiber 8 is directly opposite the fluorescent body 12.
  • This arrangement requires high positioning accuracy.
  • the components window 15, fluorescent body 12 and optics 14 can also be combined in a lighting fixture 10 of the type already described and used as a unit in the replaceable head 16.
  • the optics 14 are a deflecting prism 17 and a lighting objective 18 downstream, with which a deflected by 90 ° illumination beam cone 19 is generated. Shown in dashed lines are conventional components for video recording of the illuminated object.
  • an imaging lens 20 is connected upstream of the light exit surface of the glass fiber 8 at the distal end of the insertion part 3, which focuses the emerging excitation beam into the fluorescence body 12 with the interchangeable head pushed on.
  • the fluorescent body 12 is stored here between two heat-dissipating fernstem / discs 15. The focus of the imaging lens 20 is adjusted so that the excitation light is correctly focused into the fluorescent body 12, taking into account the thickness of the disk 15.
  • a collimating lens 21 is arranged, which images the exciting beam emerging from the light exit surface of the glass fiber 8 to infinity.
  • the excitation light must be focused on the fluorescent body 12 with an imaging lens 20 arranged in the replaceable head 16.
  • the variant is more complex, but it allows greater tolerances in the attachment of the replaceable head 16. With the collimated beam, the greatest design options are open, since the white light generation can be provided at any point in the replaceable head 16.
  • a larger fluorescent body 22 is arranged downstream of the deflection prism 17. In the fluorescent body 22, therefore, the collimated excitation beam is irradiated. Because of the distributed over the beam cross section radiation density is the
  • Power density in the fluorescent body 22 is reduced.
  • the reduction of the maximum radiation density advantageously reduces the fading, the aging and the heating of the fluorescent body 22.
  • With sufficient intensity of the excitation beam, a part of the excitation light can also directly through
  • Fig. 7b shows the same arrangement but with forward lighting and observation.
  • the collimated excitation beam is split by a beam splitter 23 into two beams.
  • the part reflected at the beam splitter surface is used for conversion to white light.
  • two parallel measuring beams are generated in a conventional manner on not further designated optical elements, which form a comparative scale for image measurement in the image.
  • the part of the excitation beam transmitted through the beam splitter 23 can also be used to excite a further fluorescence body.
  • a shadow-free illumination is made possible, the reliability of the system is improved or different color spectra or emission directions can be set.
  • a division of the collimated excitation beam also takes place.
  • the part transmitted through the beam splitter 23 is split by a diffractive optical element 24 into a plurality of radiation beams to produce a measuring pattern.
  • the fluorescent body 12 is shown in this embodiment as a ball 25 which is held by a transparent, heat-conducting base 26.
  • the base 26 and the ball 25 are covered by a reflector 27.
  • the spherical shape ensures uniform radiation.
  • the heat is unfavorable because of the small contact surface on the base 26.
  • a video camera 28 is integrated in the replaceable head 16, which is electrically connected via contacts 29 to the distal end of the insertion part 3.
  • the spherical fluorescent body 25 is here inserted into a reflector body 30, whose e.g. Parabolic inner reflector surface is mirrored.
  • the reflector body 30 may be around the spherical
  • the transmission of a fluorescence exciting light wavelength through the glass fiber it was initially assumed that the transmission of a fluorescence exciting light wavelength through the glass fiber.
  • the beam splitter surface must then be provided with a dichroic coating in the beam splitter 23 which is permeable to the wavelengths of the radiation deviating from the excitation wavelength.
  • a color more favorable for the measuring radiation e.g. red or green, for better visibility.
  • the single fiber diameter with protective sheath is only approx. 80 - 900 microns.
  • the cold-light bundle diameter is between approximately 1 to 3 mm.
  • the illumination can be optimally adapted to the visual field.
  • the color spectrum is adaptable.
  • the spectrum of the Color reproduction optimal black body radiation can be adjusted. It can also be irradiated light for the purpose of scattering without the use of Fluoreszenz bines.
  • different light sources can be fed eg with a fiber coupler into a single fiber.
  • Replaceable head can also be done a spectrum change.
  • the color spectrum can be changed even during endoscopic viewing, e.g. advantageous in investigations on color changes of the examination subject.
  • the laser diode in the supply unit is designed as a receptacle, it can be replaced at any time in the event of a defect with the Receptacle. If in future laser diodes with larger
  • the endoscopic system can be upgraded at any time in a simple way, so that the light output at the distal end can be increased. If then the higher power or a changed wavelength requires an adaptation of the fluorescent body, then this is because of the invention
  • the fiber is replaceable at any time thanks to the plug-in connection of the transmission fiber to the laser diode and the positioning of the fluorescence body as a separate component. This is a significant service advantage, as the fiber can break or crack during operation.
  • Color changes due to non-linear conversion can be corrected by adjusting the performance if necessary.
  • the laser transmission fibers have less attenuation when exposed to small numerical aperture laser light than commonly used white light fibers that emit conventional high numerical aperture illumination.
  • the new lighting system therefore allows much longer endoscopes.
  • the conventional light sources such as halogen lamps or gas discharge lamps, are technically at the physical limits. In the case of the laser diodes or the fluorescent bodies, however, it is to be expected that their powers can still be increased.
  • the intensity of the fluorescent light is dimmable without the color changing significantly. Mechanical parts such as diaphragms or absorbers are not required for attenuation. A simple reduction of the excitation light correspondingly reduces the radiation of the converted light. Completely color-neutral dimming is possible by simple pulse width modulation. • With laser diodes, the intensity of the excitation light can be changed quickly and with little effort by modulating the laser current. By interruption or variation of the excitation light, almost immediately e.g. the converted light is turned off. It only needs to wait for the extremely short afterglow of the fluorescent body. This rapid modulation is advantageous in topography measurement tasks that only require a specific measurement illumination without white light illumination for a short time.

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  • Radiology & Medical Imaging (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Engineering & Computer Science (AREA)
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  • Heart & Thoracic Surgery (AREA)
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Abstract

L'invention concerne un système endoscopique (1) présentant une source de rayonnement d'excitation (5) disposée dans une unité d'alimentation proximale (4), comprenant un parcours de transmission de rayonnement optique dans un élément d'introduction (3) et un transpondeur à fluorescence, côté distal, ledit système comprenant comme source de rayonnement d'excitation (5), une diode laser (6) émettant dans une zone spectrale visible à courte longueur d'onde et comme parcours de transmission optique, une fibre de verre (8), le transpondeur à fluorescence étant approprié pour la conversion en lumière blanche, système auquel est associé, à la surface de sortie de lumière de la fibre de verre (8), en tant que transpondeur à fluorescence, un corps de fluorescence (12, 22), sous la forme d'un élément séparé, interchangeable. Ledit système est caractérisé en ce que l'extrémité, côté distal de la fibre de verre (8) et le corps de fluorescence (12, 22) sont insérés dans un corps d'éclairage (10) présentant une ouverture de sortie de lumière (13) s'évasant en forme d'entonnoir, ou en ce que le corps de fluorescence (12, 22) est disposé dans une tête interchangeable (16) pouvant être accouplée à l'élément d'introduction (3), ladite tête étant formée avec d'autres composants optiques et/ou de dissipation de chaleur, en vue de produire un faisceau d'éclairage et/ou de mesure.
EP07819267A 2006-11-14 2007-10-24 Système endoscopique à éclairage par fluorescence à pompage de fibres Withdrawn EP2089752A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP11002427A EP2336818A1 (fr) 2006-11-14 2007-10-24 Système endoscopique à éclairage par fluorescence à pompage de fibres

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006053487A DE102006053487B4 (de) 2006-11-14 2006-11-14 Endoskopisches System mit fasergepumpter Fluoreszenzbeleuchtung
PCT/EP2007/009208 WO2008058612A1 (fr) 2006-11-14 2007-10-24 Système endoscopique à éclairage par fluorescence à pompage de fibres

Publications (1)

Publication Number Publication Date
EP2089752A1 true EP2089752A1 (fr) 2009-08-19

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EP07819267A Withdrawn EP2089752A1 (fr) 2006-11-14 2007-10-24 Système endoscopique à éclairage par fluorescence à pompage de fibres

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US (1) US20100010314A1 (fr)
EP (2) EP2336818A1 (fr)
DE (1) DE102006053487B4 (fr)
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DE102006053487A1 (de) 2008-05-21
WO2008058612A1 (fr) 2008-05-22
EP2336818A1 (fr) 2011-06-22
US20100010314A1 (en) 2010-01-14
DE102006053487B4 (de) 2013-12-19

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