JP2017158837A - Endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an endoscope with excellent assemblability, while preventing buckling or short-circuit of endoscope integrated components when a bending section is bent or an insertion section is twisted.SOLUTION: An endoscope 1 includes: an operation section 3 provided at a hand side as a proximal side; an insertion section 2 extending from the operation section 3 to a distal side along a grip-part longitudinal axis a3 and having an insertion-section central axis a2; a distal end portion 11 disposed at a distal end of the insertion section 2; elongated fiber bundles 52A and 52B extending from a proximal side of the distal end 11 to the inside of the insertion section 2; and tubes 100A and 100B extending in the insertion section 2, with their covering outer peripheries of the fiber bundles 52A and 52B. Distal-side ends of the tubes 100A and 100B include first inclined surfaces 103A and 103B provided by forming cut surfaces inclined to the extension direction, and distal openings 101A and 101B of the first inclined surfaces 103A and 103B face the outside of the insertion section 2.SELECTED DRAWING: Figure 6A

Description

  The present invention relates to an endoscope including a plurality of built-in objects in an insertion portion.

  Endoscopes that are currently widely used for medical or industrial purposes have elongated insertion portions that are inserted into objects. This insertion part can be divided into a hard type and a soft and flexible type. The endoscope is a so-called electronic endoscope that mainly transmits an image signal formed by an imaging device provided at the distal end of the insertion portion to a display device via a signal cable built in the insertion portion. And a so-called optical endoscope that guides the subject image formed by the optical system at the distal end to the eyepiece on the proximal side by a bundle of image guide fibers built in the insertion portion.

  For example, a soft and flexible insertion portion includes a distal end portion, a bending portion, and a flexible tube portion. An operation portion is provided on the proximal end side of the insertion portion.

  The bending portion is bent, for example, by operating a bending operation knob provided in the operation portion. In many cases, an operator repeatedly performs an operation of bending the bending portion or an operation of twisting the operation portion or the insertion portion when the distal end of the insertion portion is inserted to a deep portion of the object.

  In the insertion portion, in addition to the signal cable or image guide fiber bundle extended from the imaging device, a light guide fiber bundle for supplying illumination light, an air supply tube constituting the air supply conduit, and a water supply tube constituting the water supply conduit Various built-in objects such as a dual-purpose tube serving as a suction conduit and a treatment instrument conduit, and a bending wire for bending the bending portion are inserted.

  These built-in objects may be buckled or disconnected by receiving an external force such as a compressive force or a pressing force when the bending portion is bent or when the insertion portion is twisted. For this reason, the protection tube is covered with the built-in object that may be buckled, or the built-in object that may be disconnected, thereby preventing the occurrence of buckling and disconnection.

  Patent Document 1 discloses a configuration in which a built-in object in the bending portion is covered with a protective tube having a relatively high hardness, thereby preventing damage to the built-in object due to buckling of the built-in object or contact between the built-in objects. Yes.

JP 2006-263234 A

  However, when the built-in object is covered with the protective tube as described above, when the built-in object is inserted from the distal end side of the insertion portion when assembling the endoscope, the end of the protective tube is, for example, the inside of the bending piece constituting the bending portion. There is a risk that the efficiency of the assembling work may be reduced by being caught on the peripheral surface, the end of the bending piece, or the spiral tube constituting the flexible tube portion.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide an endoscope excellent in assembling property while protecting built-in objects.

  An endoscope according to an aspect of the present invention includes an insertion portion that is formed to extend in a longitudinal direction along a predetermined central axis and is inserted into a subject, a distal end portion that is disposed at a distal end of the insertion portion, An elongated built-in object that extends from the proximal end side of the distal end part into the insertion part, and a tube body that extends into the insertion part so as to cover the outer periphery of the internal part. A portion of the proximal end edge located on the side away from the central axis of the insertion portion is arranged on the distal end side from a portion located on the central axis side.

  An endoscope according to another aspect of the present invention includes an insertion portion that is formed so as to extend in a longitudinal direction along a predetermined central axis and is inserted into a subject, and a distal end portion that is disposed at the distal end of the insertion portion; An elongated built-in object that extends from the proximal end side of the distal end part into the insertion part, and a tube body that extends into the insertion part so as to cover an outer periphery of the built-in object. A base end side edge formed so as to include a surface inclined with respect to the extending direction is provided at an end portion on the base end side, and the base end side edge opens in a direction opposite to the central axis of the insertion portion. It is characterized by that.

  According to the present invention, an endoscope excellent in assemblability is realized while preventing a built-in endoscope from buckling or breaking due to a bending portion being bent or an insertion portion being twisted. it can.

Diagram explaining endoscope The figure explaining an example of the bending pipe which forms a bending part The figure explaining the front-end | tip part of an insertion part The figure explaining the built-in thing extended from the front-end | tip hard part which comprises a front-end | tip part, and the protective tube which covers the outer periphery of this built-in thing The figure explaining the example of composition of a protection tube The figure explaining the structure of the protection tube used by this embodiment Schematic explaining the assembly of the insertion part in this embodiment Schematic diagram explaining a state during assembly in which the distal end of the bending tube is located in the vicinity of the proximal end portion of the protective tube The schematic diagram explaining the state in the middle of the assembly in which the front-end bending piece of a bending tube is located on the 1st inclined surface provided in the base end part of the protection tube The figure explaining the assembly | attachment state by which the front-end | tip bending piece of the bending tube was connected to the front-end | tip hard part.

  Embodiments of the present invention will be described below with reference to the drawings. In addition, each drawing used for the following description is shown schematically, and in order to show each component to an extent that can be recognized on the drawing, the dimensional relationship and scale of each member are different for each component. May be shown. Therefore, the present invention is limited only to the illustrated forms, such as the quantity of the components described in these drawings, the shape of the components, the ratio of the sizes of the components, and the relative positional relationship of the components. It is not a thing.

  As shown in FIG. 1, the endoscope 1 includes an insertion unit 2, an operation unit 3, and a universal cord 4. The universal cord 4 is extended from a predetermined position of the operation unit 3. A connector (not shown) is provided at the base end of the universal cord 4. This connector is connected to an external device (not shown) such as a light source device or a video processor.

  The operation unit 3 is provided with a bending operation knob 5 that is rotated, a plurality of remote switches 6, an air / water supply button 7, and a suction button 8. Reference numeral 5A denotes an up / down bending knob, and reference numeral 5B denotes a left / right bending knob. The bending knobs 5 </ b> A and 5 </ b> B, the remote switch 6, the air / water supply button 7, and the suction button 8 are provided so that they can be operated with fingers of the hand holding the operation unit 3. A treatment instrument insertion port portion 9 is provided on the insertion portion 2 side of the operation portion 3.

  The insertion portion 2 is formed in an elongated shape and has flexibility. The insertion part 2 extends from the operation part 3 to the distal end side. The insertion portion central axis a2 of the insertion portion 2 extends to the distal end side along a predetermined gripping portion longitudinal axis a3 of the operation portion 3 provided on the proximal side that is the proximal end side.

  The insertion portion 2 includes a distal end portion 11 on the distal end side. A bending portion 12 is connected to the proximal end side of the distal end portion 11, and a flexible tube 13 is connected to the proximal end side of the bending portion 12.

  The flexible tube 13 is mainly composed of a flex 14 constituting an inner layer, a blade 15 constituting an intermediate layer, and a skin resin 16 constituting an outer layer, as shown in the A section enlarged sectional view in FIG. Has been. The flex 14 is formed by spirally winding a strip-shaped thin plate material having elasticity. The blade 15 is formed by weaving a bundle of strands. The blade 15 covers the flex 14. The outer resin 16 is made of a flexible thermoplastic resin such as polyurethane and covers the blade 15.

  The bending portion 12 includes a bending piece set 20 (detailed configuration will be described later) which is a bending tube shown in an enlarged sectional view of a portion B in FIG. 1, and a blade which is a mesh tube which covers the bending piece set 20 and forms an intermediate layer. 19 and a skin tube 18 that is a skin that covers the blade 19 and is provided on the outer layer. The outer tube 18 is made of a stretchable rubber, for example, a thermoplastic elastomer such as a polyurethane tube. The outer tube 18 constitutes the outermost layer of the bending portion 12.

  The bending piece set 20 is formed so as to be bent in, for example, four directions by connecting a plurality of bending pieces in a freely rotatable manner. The bending piece set 20 may be configured to bend in two directions.

  As shown in FIG. 2, the bending piece set 20 that bends in four directions includes, in order from the distal end side, a distal bending piece 21, a plurality of upper and lower intermediate bending pieces 22, a plurality of vertical bending intermediate pieces 23, and a proximal bending piece. 24. These bending pieces are pivotally supported by a connecting pin 25 so as to be rotatable.

  At predetermined positions on the inner surface of the distal bending piece 21, there are provided a plurality of wire fixing portions 27 to which the distal ends of the bending wires 26 corresponding to the up, down, left and right directions are respectively fixed integrally. The distal bending piece 21 is arranged in a proximal-side circumferential groove (see reference numeral 38 in FIG. 3), which will be described later, of the distal end rigid portion 31 constituting the distal end portion 11.

  Reference numeral 28 denotes a wire guide, which is provided at a predetermined position of, for example, the up / down / left / right intermediate bending piece 22, the plurality of up / down intermediate bending pieces 23, and the proximal end bending piece 24. The wire guides 28 are arranged so that the respective bending wires 26 corresponding to the vertical and horizontal directions are inserted. Further, in the present embodiment, the bending tube is the bending piece set 20. However, instead of the bending piece set 20, a metal hard pipe configured to be bent by providing a plurality of slots in a hard metal pipe member may be used as the bending pipe.

  The built-in object extended from the front-end | tip part 11 of the insertion part 2 and the front-end | tip part 11 is demonstrated with reference to FIG. As shown in FIGS. 3 and 4, the distal end portion 11 mainly includes a distal end rigid portion 31 and an insulating cover 32.

  The tip hard part 31 is made of metal such as stainless steel. The insulating cover 32 is made of an electrically insulating material such as polysulfone. The insulating cover 32 is provided so as to cover the distal end surface of the distal end rigid portion 31 and the distal end side outer peripheral surface.

  As shown in FIG. 3, a through hole described below is formed in the distal end hard portion 31 and the insulating cover 32. A through hole 31 a to a through hole 31 e are formed in the distal end rigid portion 31. In the insulating cover 32, through holes 32a to 32e are formed at positions facing the respective through holes 31a to 31e.

  An imaging unit 40 (details will be described later) is disposed in the through hole 31a. The first illumination unit 50A (details will be described later) is disposed in the through hole 31b. The second illumination unit 50B (details will be described later) is disposed in the through hole 31c. The through hole 31d is a through hole provided as an air / water supply conduit. And the through-hole 31e is a through-hole provided as a treatment tool channel for inserting a treatment tool.

  The through hole 32a is a through hole in which the tip portion of the imaging unit 40 is exposed to the outside. The through hole 32b is a through hole in which the tip portion of the first lighting unit 50A is exposed to the outside. The through hole 32c is a through hole in which the tip portion of the second illumination unit 50B is exposed to the outside. The through hole 32d is a through hole in which an air / water supply nozzle 60 (details will be described later) is disposed. The through hole 32e is a through hole for leading the treatment tool to the distal end side of the insertion portion.

  The number and types of through-holes are not limited to the above. Even if the number of through-holes is increased in order to add other functions, the number of through-holes can be reduced to limit the functions. Good. Reference numeral 38 denotes a proximal end side circumferential groove, and the distal end side portion of the distal bending piece 21 is attached to the proximal end side circumferential groove 38. Reference numeral 39 denotes a tip-side circumferential groove, and the tip-side circumferential groove 39 is covered with an insulating cover 32. Reference numeral 43 denotes a signal line portion, reference numeral 52A denotes a first fiber bundle, and reference numeral 72 denotes a channel tube, which will be described later.

  As shown in FIG. 4, an imaging unit 40 is disposed in the through holes 31a and 32a. The imaging unit 40 includes an objective lens unit 41, a solid-state imaging device such as a CCD and a circuit unit 42 including the circuit, and a signal line unit 43 connected to the circuit unit 42. Note that the detailed structures of the objective lens unit 41, the circuit unit 42, and the signal line unit 43 are omitted in FIG. 4, and only the positions where they are arranged are indicated by symbols and arrows.

  The front end side portion of the objective lens portion 41 is disposed in the through hole 32a in a predetermined state. An objective lens portion 41 and a circuit portion 42 are disposed in the through hole 31a in a predetermined state. The signal line portion 43 is one of the built-in components disposed in the insertion portion 2, and extends from the proximal end side of the distal end rigid portion 31 into the insertion portion 2 and is directed toward the operation portion 3.

  The first illumination unit 50A is disposed in the through holes 31b and 32b. The first illumination unit 50A has an elongated first fiber bundle 52A in which a first illumination lens portion 51A and a plurality of optical fibers 55 are bundled. The first fiber bundle 52A is fixed at a predetermined position in the first lens frame 53A constituting the first illumination lens portion 51A.

  The first lens frame 53A is disposed in the through holes 31b and 32b. The first fiber bundle 52 </ b> A is one of the built-in items disposed in the insertion portion 2, and is extended from the proximal end side of the distal end rigid portion 31 into the insertion portion 2 toward the operation portion 3.

  A second illumination unit 50B is disposed in the through holes 31c and 32c. The second lighting unit 50B is, for example, smaller in diameter than the first lighting unit 50A and has a substantially similar configuration. In other words, the second illumination unit 50B has a long second fiber bundle 52B in which the second illumination lens portion 51B and the plurality of optical fibers 55 are bundled.

  The second fiber bundle 52B is fixed at a predetermined position in the second lens frame 53B constituting the second illumination lens portion 51B. The second lens frame 53B is disposed in the through holes 31c and 32c. The second fiber bundle 52B is one of the built-in components arranged in the insertion portion 2 in the same manner as described above. The second fiber bundle 52B extends from the proximal end side of the distal end rigid portion 31 into the insertion portion 2 and faces the operation portion 3. ing.

  The air / water supply section 60 mainly has a nozzle 61, a connection base 62, and an air / water supply tube 63. The nozzle 61 is disposed and fixed in the through holes 31d and 32d. The connection cap 62 is fixed in the through hole 31 d, and the proximal end portion projects from the proximal end side of the distal end hard portion 31.

  And the front-end | tip part of the air / water supply tube 63 is fixed to the base end part of the protruding connection cap 62. The air / water supply tube 63 is one of the built-in components disposed in the insertion portion 2, and extends from the proximal end side of the distal end rigid portion 31 into the insertion portion 2 and is directed toward the operation portion 3. The air / water supply tube 63 branches into an air supply tube (not shown) and a water supply tube (not shown) in the middle.

  The treatment instrument channel portion (not shown) has a channel tube 72. The distal end of the channel tube 72 is connected to the through hole 31 e via a connection base (not shown) protruding from the proximal end side of the distal end rigid portion 31. The channel tube 72 is one of the built-in components disposed in the insertion portion 2, and extends from the proximal end side of the distal end rigid portion 31 into the insertion portion 2 and is directed toward the operation portion 3.

  In the present embodiment, there is one in which a protective tube 100 extending in the extending direction of the built-in object is provided on the outer peripheral surface of the built-in object that extends from the proximal end side of the distal end rigid portion 31 into the insertion portion 2. The protective tube 100 is a tube body having a hardness higher than that of the built-in object, and when the bending portion 12 is bent or when the insertion portion 2 is twisted, the built-in object is buckled by an external force applied to the built-in object. In addition, the built-in objects come into contact with each other and the electric wires inserted into the inside, the optical fiber 55, and the like are prevented from being broken.

  For example, as shown in FIG. 5A, the protective tube 100 is provided by fixing the distal end side end portion to the distal end side of the first fiber bundle 52 </ b> A extending from the proximal end side of the distal end rigid portion 31. An opening facing the inner surface 2i of the insertion portion 2 in this fixed state, that is, a proximal end opening opened toward the outer side of the insertion portion 2, is provided at least at the proximal end, which is the end portion of the protective tube 100. 101 is provided.

  The proximal end opening 101 is provided in a first inclined plane 103 that appears by forming a cut surface that intersects the tube longitudinal axis 102 at the proximal end portion of the protective tube 100, that is, a plane inclined with respect to the tube extending direction. It is an opening that faces the outside of the portion 2 in the radial direction. The configuration of the end edge on the proximal end side of the protective tube 100 provided with the first inclined plane 103 is a portion located on the side away from the central axis of the insertion portion 2 (a portion on the radially outer side of the insertion portion 2). In other words, it can be paraphrased as being arranged on the distal end side from the portion (the radially inner portion of the insertion portion 2) located on the central axis.

  In the present embodiment, the protective tube 100 is provided with a tip opening 105 on the tip side as shown in FIG. 5B. The distal end opening 105 is an opening provided in the second inclined plane 106 that intersects the tube longitudinal axis 102, and is an opening that faces away from the outside of the insertion portion 2 shown in FIG. 5A in a fixed state. The insertion portion is fixed so as to face the central axis direction. In the present embodiment, the second inclined plane 106 is formed as a plane parallel to the first inclined plane 103 and constitutes an end edge on the front end side.

  In the present embodiment, a first fiber protection tube (hereinafter abbreviated as a first tube) is provided so as to cover the outer peripheral surface of the first fiber bundle 52A extending from the proximal end side of the distal end rigid portion 31 into the insertion portion 2. 100A, and a second fiber protection tube (hereinafter abbreviated as a second tube) 100B is provided so as to cover the outer peripheral surface of the second fiber bundle 52B.

  In the present embodiment, the first tube 100 </ b> A and the second tube 100 </ b> B are extended to the inner surface of the flexible tube 13 that is the insertion portion 2.

  As described above, since the second illumination unit 50B has a smaller diameter than the first illumination unit 50A, the second tube 100B provided in the second fiber bundle 52B has an inner diameter dimension, an outer diameter dimension, and the like that are different from those of the first tube 100A. Are different and are set to the optimal dimensions.

  Here, with reference to FIGS. 6A to 6D, the assembly of the insertion portion 2 for assembling the bending piece set 20 in which the flexible tube 13 is connected to the distal end rigid portion 31 from which the built-in object extends will be described. 6A to 6D, illustration of the built-in components other than the first fiber bundle 52A and the second fiber bundle 52B is omitted to simplify the description. Further, the bending wire, the wire fixing portion, the wire guide and the like are not shown.

  As shown in FIG. 6A, built-in objects such as the first fiber bundle 52A and the second fiber bundle 52B are extended from the proximal end side of the distal end rigid portion 31. The first tube 100A is covered on the distal end side of the first fiber bundle 52A, and the second tube 100B is covered on the distal end side of the second fiber bundle 52B. The proximal end opening 101A of the first tube 100A and the proximal end opening 101B of the second tube 100B are arranged so as to face outward of the insertion portion 2 as described above.

  When assembling the insertion portion 2 of the endoscope 1, the operator opens the distal end opening 21m of the distal bending piece 21 of the bending piece set 20 as shown by the arrow Y6A, such as the first fiber bundle 52A and the second fiber bundle 52B. Place on the end side. Thereafter, the worker places the end of the built-in object in the distal bending piece 21. Then, the operator starts the operation of placing the distal bending piece 21 in the proximal end circumferential groove 38 of the distal end rigid portion 31 while inserting the built-in object into the bending piece set 20.

  As shown in FIG. 6B, the distal end opening 21m of the distal bending piece 21 is located at a position close to the proximal ends of the first tube 100A and the second tube 100B covered by the first fiber bundle 52A and the second fiber bundle 52B. To reach. At this time, the respective base end openings 10A and 101B in the first tube 100A and the second tube 100B face the radially outer side of the insertion portion 2.

  Therefore, when the operator moves the distal bending piece 21 further toward the distal end rigid portion 31 as indicated by the arrow Y6B, the distal opening 21m of the distal bending piece 21 is, as shown in FIG. 6C, the first tube 100A, It arrange | positions on this inclination plane 103A, 103B, without contacting the 1st inclination plane 103A, 103B of the 2nd tube 100B.

  Thereafter, the operator moves the tip bending piece 21 further toward the tip rigid portion 31 so that the tip opening 21m passes through the first inclined planes 103A and 103B. Thereafter, the wire fixing portion and the wire guide are arranged on the first inclined planes 103A and 103B and smoothly move and pass without being caught.

  At this time, the first fiber bundle 52A and the second fiber bundle 52B are connected to the first inclined planes 103A and 103B through the first tube 100A and the second tube 100B from the wire fixing portion, the wire guide, and the like that move while in contact with each other. External force is applied. For this reason, the first fiber bundle 52A and the second fiber bundle 52B are inserted into the bending piece set 20 while being gradually deformed.

  Then, as shown by a broken line in FIG. 6D, the distal bending piece 21 reaches the proximal end circumferential groove 38 of the distal end rigid portion 31. At this time, since the lengths of the first tube 100A and the second tube 100B are set to predetermined lengths, the base ends of the first tube 100A and the second tube 100B of the flex 14 constituting the flexible tube 13 It is arranged at a predetermined position on the inner surface. In this arrangement state, the first inclined planes 103 </ b> A and 103 </ b> B face the inner surface of the coupling base 29 and face the inner surface of the flex 14.

  Therefore, the first fiber bundle 52A and the second fiber bundle 52B receive a large external force generated when the distal inner surface of the coupling base 29 and the distal inner surface of the flex 14 are caught by the first tube 100A and the second tube 100B. It is arranged at a desired position without any.

  In this way, a base that opens toward the outside of the insertion portion 2 at a predetermined position of, for example, the first fiber bundle 52A and the second fiber bundle 52B that are built-in objects disposed in the vicinity of the inner peripheral surface of the insertion portion 2. A first tube 100A and a second tube 100B having end openings 101A and 101B are fixed.

  As a result, when the operator assembles the insertion portion 2, the bending pieces constituting the bending piece set 20 and the ends of the first tube 100A and the second tube 100B are caught, the wire fixing portion 27 or the wire guide. 28, the first tube 100A and the end of the second tube 100B are caught, the connection base 29 and the first tube 100A, the end of the second tube 100B are caught, the flex 14 and the first tube 100A, the first 2 In addition to preventing the end of the tube 100B from being caught, and preventing the above-described catching during assembly to prevent the optical fiber 55 from being damaged by applying a large external force, improving the assembly workability. Can be achieved.

  In addition, the first inclined plane 103 and the second inclined plane 106 are provided at the ends of the first tube 100A and the second tube 100B, respectively, and the first inclined plane 103 and the second inclined plane 106 are in a parallel positional relationship. ing.

  As a result, when the operator arranges the first tube 100A and the second tube 100B in the first fiber bundle 52A and the second fiber bundle 52B, the operation of discriminating the directions of the first tube 100A and the second tube 100B is eliminated. In addition, by disposing the distal end openings 105A and 105B in the direction of the central axis of the insertion portion, the proximal end openings 101A and 101B can be easily arranged outward of the insertion portion 2.

  In addition, by providing the tip openings 105A and 105B on the tip side of the first tube 100A and the second tube 100B, it is possible to reduce the internal material filling rate in the tip portion 11.

  Further, the first fiber bundle 52A and the second fiber bundle 52B are covered with the first tube 100A and the second tube 100B, so that the light is emitted when the bending portion 12 is bent or when the insertion portion 2 is twisted. It is possible to prevent the fiber 55 from being broken.

  In the embodiment described above, the first fiber bundle 52A and the second fiber bundle 52B, which are built-in objects, have base end openings 101A and 101B that open toward the outside of the insertion portion 2 at predetermined positions. The first tube 100A and the second tube 100B are fixed. However, the air / water feeding tube 63 or the channel tube 72 which is another built-in object is covered with the protective tube 100 as described above to prevent the air / water feeding tube 63 or the channel tube 72 from being buckled by an external force. May be. In addition, the signal tube 43 that is another built-in object is covered with the protective tube 100 as described above to prevent the signal line inserted into the signal line 43 from being disconnected by an external force. Also good. Further, the channel tube 72 which is another built-in object may be covered with the protective tube 100 as described above to prevent the channel tube 72 from being buckled by an external force.

  It should be noted that the present invention is not limited to the embodiments described above, and various modifications can be made without departing from the spirit of the invention. For example, the first inclined plane 103 described above may be formed as a curved surface instead of a simple inclined plane. That is, a portion located on the side away from the central axis of the insertion portion 2 in the first inclined plane 103 (a portion on the radially outer side of the insertion portion 2) is replaced with a portion located on the central axis (the radially inner side of the insertion portion 2). If it is the structure arrange | positioned rather than the front-end | tip side from this part), it is contained in the summary of this invention.

DESCRIPTION OF SYMBOLS 1 ... Endoscope 2 ... Insertion part 2i ... Inner surface 3 ... Operation part 3A ... Gripping part 3B ... Operation part main body
4 ... Universal cord 5 ... Bending operation knob 5A ... Up / down bending knob
5B ... Left / right bending knob 6 ... Remote switch 7 ... Air / water supply button 8 ... Suction button
DESCRIPTION OF SYMBOLS 9 ... Treatment instrument insertion port part 11 ... Tip part 12 ... Bending part 13 ... Flexible tube 14 ... Flex
15 ... Blade 16 ... Skin resin 18 ... Skin tube 19 ... Blade
19 ... outer tube 20 ... bending piece group 21 ... tip bending piece 21m ... tip opening
22 ... Up / down / left / right intermediate bending piece 23 ... Up / down intermediate bending piece 24 ... Base end bending piece
25 ... Connecting pin 26 ... Bending wire 27 ... Wire fixing part 28 ... Wire guide
29 ... Connecting base 31 ... Hard end portion 31a ... Through hole 31b ... Through hole 31c ... Through hole
31d ... through hole 31e ... through hole 32 ... insulating cover 32a ... through hole 32b ... through hole
32c ... through hole 32d ... through hole 32e ... through hole 38 ... proximal peripheral groove
39 ... tip side circumferential groove 40 ... imaging unit 41 ... objective lens part 42 ... circuit part
43 ... Signal line part 50A ... 1st lighting unit 50B ... 2nd lighting unit
51A ... First illumination lens portion 51B ... Second illumination lens portion 52A ... First fiber bundle
52B ... Second fiber bundle 53A ... First lens frame 53B ... Second lens frame
55 ... Optical fiber 60 ... Air / water supply part 61 ... Nozzle 62 ... Connection base
63 ... Air / water tube 70 ... Treatment instrument channel 72 ... Channel tube
100 ... Protective tube 100A ... First fiber protective tube (first tube)
100B ... 2nd fiber protection tube (2nd tube) 101 ... Base end opening
102 ... Tube longitudinal axis 103 ... First inclined plane 105 ... Tip opening
106: second inclined plane

Claims (14)

An insertion portion that is formed to extend in the longitudinal direction along a predetermined central axis and is inserted into the subject;
A distal end portion disposed at the distal end of the insertion portion;
An elongated built-in object extending from the proximal end side of the distal end portion into the insertion portion;
A tube body extending into the insertion portion so as to cover the outer periphery of the built-in object,
It has
An endoscope characterized in that a portion located on a side farther from the central axis of the insertion portion at an end edge on the proximal end side of the tube body is arranged on a distal end side than a portion located on the central axis side. .   The part located in the side far from the central axis of the said insertion part in the edge of the front end side in the said tube body is arrange | positioned in the front end side rather than the part located in this central axis, It is characterized by the above-mentioned. Endoscope.   The endoscope according to claim 2, wherein the proximal end edge and the distal end edge are formed so as to be included in a plane inclined with respect to the extending direction. .   The endoscope according to claim 1, wherein a plurality of the elongated built-in object and the tube body are provided.   The endoscope according to claim 1, wherein the tube body is fixed to the built-in object at a distal end portion.   The endoscope according to claim 1, wherein the tube body is disposed so as to face an inner peripheral surface of a tubular member constituting the insertion portion.   The insertion portion includes a bending portion connected to the rear end side of the distal end portion and a flexible tube connected to the rear end side of the bending portion, and the tube body extends to the inner surface of the flexible tube. The endoscope according to claim 1, wherein the endoscope is provided. An insertion portion that is formed to extend in the longitudinal direction along a predetermined central axis and is inserted into the subject;
A distal end portion disposed at the distal end of the insertion portion;
An elongated built-in object extending from the proximal end side of the distal end portion into the insertion portion;
A tube body extending into the insertion portion so as to cover the outer periphery of the built-in object,
It has
A proximal end edge formed to include a surface inclined with respect to the extending direction is provided at an end portion on the proximal end side of the tube body, and the proximal end edge is connected to the central axis of the insertion portion. An endoscope characterized by opening in the opposite direction.   A distal end edge formed to include a surface inclined with respect to the extending direction is provided at an end portion on the distal end side of the tube body, and the distal end edge opens toward the central axis of the insertion portion. The endoscope according to claim 8, characterized in that the endoscope is provided.   The endoscope according to claim 9, wherein the end edge on the distal end side is formed to include a surface parallel to the edge on the proximal end side.   The endoscope according to claim 8, wherein a plurality of the elongated built-in objects and the tube bodies are provided.   The endoscope according to claim 8, wherein the tube body is fixed to the built-in object at an end portion on a distal end side.   The endoscope according to claim 8, wherein the tube body is disposed so as to face an inner peripheral surface of a tubular member constituting the insertion portion.   The insertion portion includes a bending portion connected to the rear end side of the distal end portion and a flexible tube connected to the rear end side of the bending portion, and the tube body is extended to the inner surface of the flexible tube. The endoscope according to claim 8, wherein:

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