JP6210764B2 - Electronic endoscope - Google Patents

Description

  The present invention relates to an electronic endoscope including an imaging unit at a distal end portion of an insertion unit.

  Endoscopes are used in the medical field or the industrial field. The endoscope includes an elongated insertion portion that is inserted into a living body or a structure that is difficult to observe visually. At the distal end portion of the insertion portion, an illumination unit that emits illumination light, an imaging unit for capturing subject light of an observation target site illuminated by the illumination light emitted from the illumination unit, and the like are provided.

  As the configuration for emitting the illumination light of the endoscope to the observation target part, the light emitted from the light source element such as the light source lamp or the LED is transmitted to the tip part by a light guide or the like, and the light is emitted to the tip part of the insertion part. It is roughly divided into those in which elements are arranged.

  Further, the endoscope includes an optical endoscope and an electronic endoscope (hereinafter referred to as an electronic endoscope). An optical endoscope includes an objective lens that faces an observation target part, an image guide fiber bundle that guides subject light captured by the objective lens, an eyepiece lens that is provided to face the base end surface of the image guide fiber bundle, and the like. It is configured with.

On the other hand, an electronic endoscope has a lighting unit that irradiates an observation target part, an imaging optical system that collects an observation image of the observation target part, and a solid that detects and photoelectrically converts imaging light collected by the imaging optical system And an imaging unit composed of an imaging element or the like.
In recent years, in electronic endoscopes, it has been desired to obtain a higher-definition observation image. In order to meet the demand, the number of pixels of an image sensor made up of a CCD or C-MOS is increased, and the luminance of illumination light is increased. Improvement, increase in the amount of light, and the like.

  However, in an electronic endoscope with an increased number of pixels or higher brightness / increased light amount, the temperature at the distal end of the endoscope increases with an increase in the amount of heat generation, and the temperature of the element itself excessively increases. As a result, noise such as dark current may be generated and observation accuracy may be reduced.

For this reason, in an endoscope, the heat dissipation structure which dissipates more effectively the heat generated at the distal end portion of the endoscope is required.
For example, Patent Document 1 discloses an endoscope provided with means for effectively radiating heat generated in a light emitting element while obtaining a sufficient amount of light by the light emitting element without increasing the diameter of the insertion portion. . In this endoscope, a substrate on which a light emitting element is attached is fixed to a protruding portion formed at the distal end portion of the bending member. According to this configuration, heat generated in the light emitting element is conducted from the substrate to the bending member, and then conducted to the helical tube of the flexible tube connected to the proximal end side of the bending member. The substrate is formed of a member having higher thermal conductivity than the distal end hard portion, and the bending member is formed of a member equivalent to or higher in thermal conductivity than the distal end hard portion.

JP 2011-19570 A

  However, in the endoscope of Patent Document 1, a bending member configured to be bent by providing a plurality of slit portions in a predetermined pattern with a certain interval in the longitudinal direction, and a helical tube of a flexible tube, There is a description of an integral tubular member. However, a heat dissipation path for specifically dissipating heat generated from the light emitting element and heat generated from the imaging element to the outside of the endoscope has not been shown. Therefore, in the endoscope disclosed in Patent Document 1, in order to further increase the number of pixels and the brightness, heat generated by a light emitting element or the like disposed in the distal end portion of the insertion portion is generated from the outer peripheral portion of the insertion portion. There is a risk of being released inside.

  The present invention has been made in view of the above circumstances, and reliably releases the heat generated in the distal end portion of the insertion portion to the outside without impairing the bending performance of the endoscope insertion portion and the insertion property into the body. An object of the present invention is to provide an electronic endoscope that can obtain a high-definition observation image.

  An electronic endoscope according to the present invention includes a distal end rigid member including an illumination unit that illuminates a subject and an imaging unit that acquires image information of the subject illuminated by the illumination unit, and a distal end and a proximal end. An insertion portion configured to be a flexible tube by laminating a plurality of tube portion forming members, which is fixed to the distal end rigid member and has a proximal end portion fixed to an endoscope operation portion to constitute an endoscope insertion portion. A tube portion and an insertion portion gripping portion provided on the proximal end side of the insertion portion tube portion and serving as a heat radiating portion and a grip portion for gripping the insertion portion, the innermost layer of the insertion portion tube portion The innermost layer tube forming member is composed of a high thermal conductivity member having a high thermal conductivity, and the innermost layer tube forming member and the heat radiating member constituting the heat radiating portion of the insertion portion gripping portion are arranged in close contact with each other. doing.

  According to the present invention, it is possible to reliably release the heat generated in the distal end portion of the insertion portion to the outside of the body without impairing the bending performance of the endoscope insertion portion and the insertion property into the body, thereby obtaining a high-definition observation image. An electronic endoscope can be realized.

The figure explaining an electronic endoscope The figure explaining the structure of the insertion part of an electronic endoscope (A) is a sectional view taken along line Y3A-Y3A in FIG. 2, and (B) is a sectional view taken along line Y3B-Y3B in FIG. The figure explaining the relationship between the spiral tube which comprises an insertion part, an illumination part, and an imaging part. The figure explaining the relationship between the spiral tube which comprises an insertion part, and an illumination part provided with a light guide fiber bundle

Embodiments of the present invention will be described below with reference to the drawings.
An embodiment of the present invention will be described with reference to FIGS.

  As shown in FIG. 1, the electronic endoscope 1 includes an insertion portion 2, an operation portion 3 provided on the proximal end side of the insertion portion 2, and a universal cord 4 extending from the proximal end side of the operation portion 3. It is mainly composed.

  As shown in FIGS. 1 and 2, the insertion portion 2 is configured by connecting a distal end rigid member 5 and an insertion portion pipe portion 6 that is a flexible tubular member. The insertion portion tube portion 6 includes a bending tube portion 7 that forms the distal end side, and a flexible tube portion 8 that is connected to the bending tube portion 7. Reference numeral 9 denotes an insertion portion gripping portion that serves both as a heat radiating portion and a gripping portion.

  As shown in FIG. 1, the distal end surface 10 of the distal end rigid member 5 is provided with, for example, a treatment instrument opening 13 in addition to the observation window 11 of the imaging unit and the illumination window 12 of the illumination unit.

  The operation unit 3 is provided with an angle lever 14, a suction button 15, a treatment instrument insertion port 16, various switches 17, 18 and the like. The angle lever 14 is a lever for bending the bending tube portion 7 constituting the insertion portion 2 in an upward direction and a downward direction, for example. The treatment instrument insertion port 16 communicates with the treatment instrument opening 13 via a treatment instrument channel that also serves as a suction line (not shown). The treatment tool introduced from the treatment tool insertion port 16 is led out of the insertion portion 2 from the treatment tool opening 13. The various switches 17 and 18 are, for example, a freeze switch that generates a freeze signal, and a release switch that generates a release signal when performing image acquisition.

  A connector (not shown) that can be attached to and detached from an external device such as a camera control unit (not shown) is provided on the base end side of the universal cord 4. The camera control unit includes a power supply unit that supplies power to an imaging unit and a lighting unit, which will be described later, and an image processing unit that processes an electrical signal transmitted from the imaging unit so that it can be displayed on a display device (not shown). .

As shown in FIG. 2, the insertion tube portion 6 includes the above-described bending tube portion 7 and the flexible tube portion 8. The distal end side of the bending tube portion 7 constituting the insertion portion tube portion 6 is fixed to the proximal end side of the distal end hard member 5. The proximal end side of the flexible tube portion 8 constituting the insertion portion tube portion 6 is fixed to the distal end side of the insertion portion connecting member 19 constituting the distal end side of the operation portion 3.
Reference numeral 20 is a folding tube. The folding tube 20 integrally connects and fixes the proximal end portion of the flexible tube portion 8 and the distal end portion of the insertion portion connecting member 19 while maintaining watertightness.

  As shown in FIG. 2 and FIG. 3A, the bending tube portion 7 is a tube portion forming member and forms the innermost layer, the spiral tube 21, the bending portion mesh tube 22, and the bending rubber that forms the outermost layer. 23 is laminated in the normal direction perpendicular to the longitudinal axis of the insertion tube portion.

  On the other hand, as shown in FIG. 2 and FIG. 3B, the flexible tube portion 8 includes a spiral tube 21 that is a tube portion forming member, a flexible tube mesh tube 24, and a heat-shrinkable tube 25 that constitutes the outermost layer. Are laminated in the normal direction perpendicular to the longitudinal axis of the insertion tube section.

  The spiral tube 21 is a core material of the insertion tube portion 6 and constitutes the innermost layer of the bending tube portion 7 and the innermost layer of the flexible tube portion 8. The spiral tube 21 is formed by forming a thin strip steel plate into a spiral shape. The spiral structure of the spiral tube 21 is formed in a clockwise direction when viewed from the proximal end side, which is the operation unit 3 side, in the distal direction.

  The bending portion network tube 22 is a tube forming member for a bending tube portion that constitutes an intermediate layer that is an intermediate layer between the innermost layer and the outermost layer of the bending tube portion 7, and covers the spiral tube 21. The bending portion network tube 22 is formed in a tubular shape by knitting a fine metal wire such as a tungsten wire or a stainless wire into a mesh shape.

  The bending rubber 23 is a tube forming member for the bending tube that constitutes the outermost layer of the bending tube 7, and covers the bending portion mesh tube 22 covering the spiral tube 21. The curved rubber 23 is an elastic tubular flexible member having elasticity and biocompatibility.

  The flexible tube mesh tube 24 is a tube forming member for a flexible tube portion that forms an intermediate layer that is an intermediate layer between the innermost layer and the outermost layer of the flexible tube portion 8, and is a bent portion mesh tube 22. Similarly, it is knitted in a mesh shape and covers the spiral tube 21.

The heat-shrinkable tube 25 is a tube forming member for the flexible tube that forms the outermost layer of the flexible tube 8, and is made of an elastomer such as a rubber member or urethane resin, and spirals in the same manner as the curved rubber 23. A mesh tube 24 for a flexible tube that covers the tube 21 is coated. The heat-shrinkable tube 25 is a tubular flexible member having high extensibility, and is firmer than the curved rubber 23.
The insertion tube portion 6 is kept watertight by covering the outermost layer with the curved rubber 23 and the heat shrinkable tube 25 over the entire length.

  In the above-described embodiment, the mesh tube is a separate member of the bending portion mesh tube 22 and the flexible tube mesh tube 24. However, the structure which coat | covers from the front-end | tip of the spiral tube 21 to a base end with one type of spiral tube may be sufficient. Moreover, the structure which covers the outermost layer of the insertion part pipe | tube part 6 with the curved rubber 23 over the full length, or the structure covered with the heat contraction tube 25 may be sufficient.

  As shown in FIG. 2, the insertion portion gripping portion 9 includes a heat sink 26 and a cover portion 27. The insertion portion gripping portion 9 is on the proximal end side of the flexible tube portion 8 in consideration of heat dissipation and operability, and the distal end hard member 5 constituting the insertion portion 2 is inserted, for example, to the deepest portion in the intestine. In the state, the arrangement position is set so as to be arranged at a predetermined distance from the anus. The heat sink 26 is a ring-shaped member, and is divided into, for example, a substantially U-shaped semicircular ring. The inner peripheral surface of the integrally formed heat sink 26 is fixed in close contact with the outer peripheral surface of the spiral tube 21, and is fixed integrally with, for example, an adhesive having high thermal conductivity.

  Fins 28 are formed on the outer peripheral surface of the heat sink 26 to increase the surface area and enhance the cooling effect. In the present embodiment, the fin 28 is configured by forming a circumferential groove. The fin 28 is not limited to a shape configured by forming a circumferential groove, and is configured by forming a groove regularly arranged in the circumferential direction, or a circumferential groove and a groove arranged in the circumferential direction. Composed in combination.

  The cover portion 27 also serves as a watertight holding member that secures watertightness between the flexible tube portion 8 and the heat sink 26 and a non-slip member that secures gripping properties.

  In the present embodiment, the helical structure of the helical tube 21 is clockwise when viewed from the operation unit 3 side. For this reason, during an endoscopic examination, when an operator rotates the insertion portion gripping portion 9 clockwise and turns the insertion portion 2 to the right, a force that reduces the diameter of the helical tube 21 acts. Acts as a driving force to advance in the insertion direction.

  As shown in FIG. 4, the distal end hard member 5 is made of, for example, stainless steel and has a cylindrical shape. The distal end rigid member 5 has a plurality of axial through holes parallel to the longitudinal axis of the distal end rigid member 5 that constitute an imaging hole 5h1, an illumination hole 5h2, a treatment instrument channel hole (not shown), and the like. .

The imaging hole 5h1 is provided with the observation window 11 and the imaging unit 30 constituting the imaging part, the illumination hole 5h2 is provided with the illumination window 12 and the illumination unit 40 constituting the illumination part, and the treatment instrument channel hole is provided with the observation hole 11h. A connecting pipe (not shown) is provided.
The axial through hole is not limited to the imaging hole 5h1, the illumination hole 5h2, and the treatment instrument channel hole, and may be an air supply / water supply hole, an auxiliary water supply hole, or the like. Is provided with a connecting pipe (not shown).

  The imaging unit 30 includes, for example, a CCD 32, an imaging circuit board 33, and an imaging optical unit 31 that are imaging elements that generate an electrical signal by photoelectrically converting received imaging light inside the observation window 11. It is mainly composed. An imaging cable 34 extends from the imaging unit 30.

  A plurality of electronic components (not shown) such as resistors and capacitors are mounted on the imaging circuit board 33. A CCD 32 is mounted by die bonding and is electrically connected to the imaging circuit board 33 via an Au wire. A plurality of signal lines inserted into the imaging cable 34 are electrically connected to the respective contacts provided on the imaging circuit board 33.

The imaging optical unit 31 includes a lens frame 35 and a plurality of optical lenses 36 disposed on the lens frame 35. The CCD 32 is fixed to the element frame 38 via a cover glass 37, for example. The element frame 38 is, for example, externally disposed on the lens frame 35, and after performing focus adjustment, the element frame 38 is integrally bonded and fixed with solder or the like.
Reference numeral 51 denotes a sealing resin that covers an electronic component (not shown) mounted on the imaging circuit board 33, a signal line connected to the imaging circuit board 33, and the like.

  The illumination unit 40 includes, for example, an LED 42 that is a light emitting element that emits illumination light to a subject, an illumination circuit board 43, and an illumination optical unit 41 inside the illumination window 12. An illumination cable 44 extends from the illumination unit 40. The LED 42 is mounted on the lighting circuit board 43 by die bonding, and is electrically connected to the lighting circuit board 43 through an Au wire. A pair of electric wires 44 a inserted through the illumination cable 44 is also electrically connected to the illumination circuit board 43. The illumination optical unit 41 includes a lens frame 45 and one or a plurality of optical lenses 46 disposed on the lens frame 45. Reference numeral 44b is a cable sheath.

  The CCD 32 of the imaging unit 30 and the LED 42 of the illumination unit 40 described above are heat generation sources. In the present embodiment, the heat generated by the CCD 32 and the heat generated by the LED 42 are conducted along a heat radiation path and are radiated to the outside.

  The imaging circuit board 33 is set to have a thermal conductivity of 10 W / mk or more using ceramics or glass ceramics as a base material. The lighting circuit board 43 is set to have a thermal conductivity of 10 W / mk or more using ceramics as a base material. The spiral tube 21 is formed of a high thermal conductive member having a thermal conductivity of 50 W / mk or more. The heat sink 26 is formed of copper, aluminum alloy, or the like, which is a high heat conductive member, like the spiral tube 21 in consideration of heat dissipation.

Then, the imaging circuit board 33 of the imaging unit 30 and the illumination circuit board 43 of the illumination unit 40 are directly set to a predetermined position of the spiral tube 21 or predetermined of the spiral tube 21 via the frame bodies 52 and 53. Fixed in position.
When the substrates 33 and 43 are directly fixed to the spiral tube 21, the substrates 33 and 43 are integrally fixed by a resin adhesive having a high thermal conductivity.

  On the other hand, when the substrates 33 and 43 are fixed to the spiral tube 21 via the frame bodies 52 and 53, the frame bodies 52 and 53 are formed in, for example, a pipe shape with copper, an aluminum alloy, or the like, which is a high heat conductive member. Then, the imaging circuit board 33 is integrally fixed to the inner surface of the imaging frame body 52 with an adhesive having a high thermal conductivity, and the outer surface of the imaging frame body 52 is soldered or the spiral tube 21 with an adhesive having a high thermal conductivity. Fixed to the inner surface of the unit.

  Similarly, the lighting circuit board 43 is integrally fixed to the inner surface of the lighting frame 53 with an adhesive, and the outer surface of the lighting frame 53 is integrally fixed to the inner surface of the spiral tube 21 with solder or an adhesive.

  The thermal conductivity of the curved rubber 23 constituting the outermost layer and the thermal conductivity of the heat shrinkable tube 25 are set to 0.2 W / mk or less. In addition, the thermal conductivity of the bending portion network tube 22 and the thermal conductivity of the flexible tube network tube 24 are set higher than the thermal conductivity of the bending rubber 23 and the thermal contraction tube 25, and the helical tube It is set to be equal to or lower than the thermal conductivity of 21.

  According to this configuration, the heat generated in the CCD 32 is conducted to the imaging circuit board 33, and then conducted from the imaging circuit board 33 to the spiral tube 21, and from the heat sink 26 provided at the proximal end portion of the spiral tube 21. Heat is released to the atmosphere. On the other hand, the heat generated by the LED 42 is conducted to the illumination circuit board 43 and then conducted from the illumination circuit board 43 to the spiral tube 21 and is radiated from the heat sink 26 to the atmosphere in the same manner as the heat produced by the CCD 32.

  That is, in the electronic endoscope 1 according to the present embodiment, the spiral tube 21 and the heat sink 26 provided at the proximal end portion of the spiral tube 21 are generated in the CCD 32 and transmitted from the imaging circuit board 33 to the spiral tube 21. A heat radiation path for conducting heat and heat generated by the LED 42 and conducted from the lighting circuit board 43 to the spiral tube 21 to the proximal end side of the spiral tube 21 and radiating heat from the heat sink 26 is provided.

  Reference numeral 54u is an upper bending wire, and reference numeral 54d is a lower bending wire. The distal ends of the wires 54u and 54d are respectively fixed at predetermined positions on the distal end side of the spiral tube 21, and the proximal ends of the wires 54u and 54d are respectively fixed to a bending mechanism section (not shown) in the operation section 3. . According to this configuration, as the angle lever 14 is operated, the upper bending wire 54u or the lower bending wire 54d is pulled and loosened, and the bending tube portion 7 bends upward or downward.

  As described above, the heat conductivity of the spiral tube 21 constituting the innermost layer of the insertion portion tube portion 6 of the laminated structure is set to be the highest, the heat conductivity of the curved rubber 23 constituting the outermost layer and the heat of the heat shrinkable tube 25. Set the conductivity to the lowest. Then, the heat sink 26 is provided at the proximal end portion of the spiral tube 21, and the imaging circuit board 33 of the imaging unit 30 and the illumination circuit substrate 43 of the illumination unit 40 are fixed to the distal end portion of the spiral tube 21 so that heat conduction is possible. As a result, the heat generated in the imaging unit 30 and the heat generated in the illumination unit 40 can be radiated to the atmosphere via the heat radiation path without making the insertion portion 2 thick. For this reason, it is prevented that the temperature of the front-end | tip part of the insertion part 2 rises, and the malfunction which a noise generate | occur | produces in an image is eliminated.

  Further, the thermal conductivity of the curved rubber 23 constituting the outermost layer and the thermal conductivity of the heat-shrinkable tube 25 were set to 0.2 W / mk or less, which is the lowest compared to the thermal conductivity of other tube portion forming members. Thus, the heat generated from the imaging unit 30 and the heat generated from the illumination unit 40 are reliably conducted from the distal end side to the proximal end side of the spiral tube 21 without releasing the heat from the middle portion of the spiral tube 21 to the outside. Can be made.

  Moreover, the distal end rigid member 5 and the insertion portion pipe portion 6 having a laminated structure are connected to constitute the insertion portion 2, and a clockwise spiral structure is obtained when the innermost layer of the insertion portion pipe portion 6 is viewed from the operation portion 3 side. It comprises a spiral tube 21 having the same. As a result, while ensuring the bending performance of the bending tube portion 7, a propulsive force that moves the insertion portion 2 in the insertion direction by turning the insertion portion 2 in a predetermined direction can be obtained, thereby improving operability. Can be planned.

  The electric wire 44 a is a copper wire bundle that is a high heat conducting member, and the cable sheath 44 b is made of an elastomer having a higher thermal conductivity than the curved rubber 23 or the heat shrinkable tube 25. According to this configuration, the heat generated by the LED 42 and conducted to the lighting circuit board 43 is conducted from the lighting circuit board 43 to the electric wire 44 a and radiated into the insertion portion 2. As a result, the temperature rise in the vicinity of the lighting unit 40 can be reduced.

  Further, the core wires of the plurality of signal lines inserted into the imaging cable 34 are made into a copper wire bundle which is a high heat conductive member, and the signal line outer sheath covering the signal lines is heat-conducted from the curved rubber 23 or the heat shrinkable tube 25. It is composed of high elastomer. Further, the imaging cable sheath is made of an elastomer having a higher thermal conductivity than the curved rubber 23 or the heat shrinkable tube 25 and lower than the thermal conductivity of the signal line outer sheath. Furthermore, the thermal conductivity of the sealing resin 51 that covers the electronic components mounted on the imaging circuit board 33 and the signal lines connected to the imaging circuit board 33 is set to be equal to or less than the thermal conductivity of the signal line skin. .

  According to this configuration, the heat generated in the CCD 32 and conducted to the imaging circuit board 33 is conducted from the imaging circuit board 33 to the signal line and is radiated into the insertion portion 2. As a result, it is possible to prevent heat conducted to the imaging circuit board 33 from being trapped in the sealing resin 51 and to reduce a temperature rise in the vicinity of the imaging unit 30.

  In the embodiment described above, the illumination unit is an illumination unit including the light emitting element and the illumination circuit board 43. However, the illumination unit is not configured to include a light emitting element, and may be an illumination unit 40A including the light guide fiber bundle 61 illustrated in FIG.

  In this configuration, a fiber frame 53A is provided on the distal end side of the light guide fiber bundle 61. The fiber frame 53 </ b> A is a high heat conductive member like the illumination frame 53 and is formed in a pipe shape. The outer peripheral surface of the light guide fiber bundle 61 is integrally fixed to the inner surface of the fiber frame 53A with an adhesive having a high thermal conductivity, and the outer peripheral surface of the fiber frame 53A is soldered or has a high thermal conductivity. It is integrally fixed to the inner surface of the spiral tube 21 by an adhesive. Other configurations are the same as those of the above-described embodiment, and the same members are denoted by the same reference numerals and description thereof is omitted.

  According to this configuration, the heat generated in the light guide fiber bundle 61 is conducted to the fiber frame 53A, and then conducted from the fiber frame 53A to the spiral tube 21, and into the atmosphere through the heat dissipation path. Since the heat is dissipated, the temperature at the distal end portion of the insertion portion 2 is prevented from rising as described above, and the problem of noise occurring in the image is eliminated.

  In the above-described embodiment, the insertion tube portion 6 has a three-layer structure. However, the laminated structure of the insertion tube portion 6 is not limited to three layers, and may be a laminated structure of two layers or a laminated structure of four or more layers. When the insertion portion pipe portion 6 is configured with a laminated structure of four or more layers, the thermal conductivity of the outer layer side pipe forming member constituting the intermediate layer is equal to or lower than the thermal conductivity of the inner layer side pipe portion forming member. Is set.

  Moreover, in embodiment mentioned above, it is set as the structure which curves the bending pipe part 7 to two directions up and down. However, the bending tube portion 7 may be configured to bend in four directions, up, down, left, and right. In this configuration, left and right bending wires are provided in addition to the up and down bending wires, and left and right bending angle levers are provided in the operation portion in addition to the up and down bending angle levers.

  Further, in the configuration in which a protective net tube or the like is provided on the outer surface side of the curved rubber 23 and the outer surface side of the heat shrinkable tube 25 for the purpose of protecting the curved rubber 23 and the heat shrinkable tube 25, the protective layer constituting the outermost layer is provided. The heat conductivity of the net tube may be set higher than the heat conductivity of the curved rubber 23 and the heat conductivity of the heat shrinkable tube 25.

  The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the invention.

DESCRIPTION OF SYMBOLS 1 ... Electronic endoscope 2 ... Insertion part 3 ... Operation part 4 ... Universal cord
DESCRIPTION OF SYMBOLS 5 ... Hard tip member 5h1 ... Imaging hole 5h2 ... Illumination hole 6 ... Insertion tube part 7 ... Curved tube part 8 ... Flexible tube part 9 ... Insertion part holding part 10 ... Tip surface 11 ... Observation window 12 ... Illumination window DESCRIPTION OF SYMBOLS 13 ... Treatment tool opening 14 ... Angle lever 15 ... Suction button 16 ... Treatment tool insertion port 17, 18 ... Switch 19 ... Insertion part connection member
DESCRIPTION OF SYMBOLS 20 ... Folding tube 21 ... Spiral tube 22 ... Curved part network pipe 23 ... Curved rubber 24 ... Flexible pipe network pipe 25 ... Heat-shrinkable tube 26 ... Heat sink 27 ... Cover part 28 ... Fin 30 ... Imaging unit 31 ... Imaging optics Part 32 ... CCD
DESCRIPTION OF SYMBOLS 33 ... Imaging circuit board 34 ... Imaging cable 35 ... Lens frame 36 ... Optical lens 37 ... Cover glass 38 ... Element frame 40, 40A ... Illumination unit 41 ... Illumination optical part 42 ... LED 43 ... Illumination circuit board 44 ... Illumination cable 44a ... Electric wire
44b ... Cable sheath 45 ... Lens frame 46 ... Optical lens 51 ... Sealing resin 52 ... Imaging frame 53 ... Illumination frame 53A ... Fiber frame 54d ... Lower bending wire 54u ... Upper bending wire 61 ... Light guide fiber bundle

Claims (9)

A distal end rigid member including an illumination unit that illuminates a subject and an imaging unit that acquires image information of the subject illuminated by the illumination unit;
A plurality of tube-forming members, each having a distal end and a proximal end, and having a distal end portion fixed to the distal end rigid member and a proximal end portion fixed to an endoscope operation portion to constitute an endoscope insertion portion are stacked. And the insertion tube section configured in a flexible tubular shape,
An insertion portion gripping portion that is provided on the proximal end side of the insertion portion pipe portion and serves also as a gripping portion and a heat dissipation portion for gripping the insertion portion;
The innermost layer tube forming member that constitutes the innermost layer of the insertion portion tube portion is composed of a high thermal conductivity member having high thermal conductivity, and the innermost layer tube portion forming member and the heat radiating portion of the insertion portion gripping portion are configured. An electronic endoscope characterized in that a heat dissipating member is closely disposed.   The electronic endoscope according to claim 1, wherein the innermost-layer tube forming member is a spiral tube extending from a distal end to a proximal end of the insertion portion tube.   The electronic endoscope according to claim 2, wherein an illumination unit configuring the illumination unit and an imaging unit configuring the imaging unit are integrally fixed to an inner surface of the spiral tube via a heat conducting member. The illumination unit includes a light emitting element that emits illumination light that illuminates a subject, an illumination circuit board having a thermal conductivity lower than that of the spiral tube on which the light emitting element is mounted, an illumination unit including an illumination optical unit, and the tip is configured to include an illumination window provided in the rigid member, the,
The imaging unit includes an imaging device that photoelectrically converts imaging light to generate an electrical signal, an imaging circuit board having a thermal conductivity lower than that of the spiral tube on which the imaging device is mounted, and an imaging unit including an imaging optical unit. , it is composed and a viewing window provided in the distal end rigid member,
The electronic endoscope according to claim 3, wherein the illumination circuit board and the imaging circuit board are directly or indirectly fixed to the spiral tube. The thermal conductivity of the outermost pipe section forming member constituting the outermost layer of the insertion portion tube section according to claim 1, characterized in that the lowest set compared to the other line forming member Electronic endoscope. The pipe part forming member constituting the outer layer is higher in thermal conductivity of the intermediate pipe part forming member constituting the intermediate layer of the insertion part pipe part and higher than the thermal conductivity of the outermost layer pipe part forming member. The electronic endoscope according to claim 5, wherein the thermal conductivity of the electronic endoscope is set to be equal to or lower than the thermal conductivity of the pipe line forming member constituting the inner layer. The cable extending from the imaging unit and the cable extending from the illumination unit are configured to include a copper wire and a cable sheath covering the copper wire,
The electronic endoscope according to claim 4 , wherein a thermal conductivity of the cable sheath is lower than a thermal conductivity of the copper wire. In the configuration in which the imaging element and the electronic component for driving the imaging element are mounted on the imaging circuit board, and the copper wire is connected,
8. The electronic device according to claim 7, wherein the connection part between the electronic component and the copper wire is covered with a resin member having a thermal conductivity equal to or lower than the thermal conductivity of the cable sheath constituting the cable. Endoscope.   The electronic endoscope according to claim 2, wherein the spiral tube has a clockwise spiral structure when viewed from a proximal end side in a distal end direction.

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