Front end structure part, endoscope insertion part, endoscope, and ultrasonic endoscope

Abstract

The invention provides a tip structural part, an endoscope insertion part, an endoscope, and an ultrasonic endoscope. The tip structure part is provided with: a tip member disposed at the tip of an insertion part of an endoscope; and a fluid channel that communicates from an opening formed in the outer surface of the tip member to the base end side, and that has a curved portion provided at a predetermined position between the opening and the base end side, the fluid channel having: a first portion that extends from the curved portion toward the tip side in a first direction to the opening; and a second portion that extends from the bent portion toward the base end side in a second direction that forms a first angle, which is an obtuse angle, with the first direction, the tip member having formed therein a first recessed portion that is recessed from the opening toward the side opposite the direction in which the first direction is bent with respect to the second direction, and the second portion extends from the bent portion toward the base end side in a second direction that forms a second angle, which is an obtuse angle with the first direction. The present invention prevents a tip member from being damaged by a line of a brush for cleaning.

Description

Technical Field

[0001] The present invention relates to a front end structure, an endoscope insertion portion, an endoscope, and an ultrasonic endoscope. Background Art

[0002] Conventionally, there is known a technique of injecting air, degassed water, or the like into a balloon so that the balloon is brought into close contact with an observation site such as the digestive tract. The balloon is attached to the distal end of an insertion portion inserted into a subject.

[0003] Patent Document 1 describes a technique for inflating a balloon by injecting air into a balloon through a vent hole formed through the front end hard portion (front end member). In addition, the following technique is also described: by making the entrance and exit of the vent hole inclined relative to the length direction of the insertion portion, a brush for cleaning can be easily inserted through the entrance and exit of the vent hole.

[0004] The cleaning brush is attached to the front end of the long wire in order to clean the entire pipe communicating with the vent hole.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent Application Publication No. 2006-230950 Summary of the invention

[0008] Problems to be solved by the invention

[0009] However, if the inlet and outlet of the ventilation hole are inclined with respect to the longitudinal direction of the insertion portion, the line of the brush for cleaning may come into contact with the edge of the inlet and outlet, and the distal end member may be damaged.

[0010] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a distal end structure portion, an endoscope insertion portion, an endoscope, and an ultrasonic endoscope that prevent the distal end member from being damaged by a brush wire for cleaning.

[0011] Means for solving problems

[0012] In order to solve the above-mentioned problems and achieve the purpose, a front end structure of one embodiment of the present invention comprises: a front end component, which is arranged at the front end of the insertion part of the endoscope; and a fluid channel, which is connected to the base end side from the opening formed on the outer surface of the front end component and has a curved portion provided at a predetermined position between the opening and the base end side, the fluid channel having: a first portion, which extends from the curved portion toward the front end side along a first direction to the opening; and a second portion, which extends from the curved portion toward the base end side along a second direction that forms a first angle as an obtuse angle with the first direction, and a first recessed portion is formed in the front end component, the first recessed portion being recessed from the opening to the side opposite to the direction in which the first direction is curved relative to the second direction. .

[0013] Furthermore, in the front end structure of one aspect of the present invention, the first recess has an inclined portion extending toward the front end side and in a third direction, and the third direction forms a second angle with the second direction that is larger than the first angle.

[0014] Furthermore, in the distal end structure portion according to one aspect of the present invention, the second direction is a direction along the longitudinal direction of the insertion portion.

[0015] Furthermore, in the distal end structure portion according to one aspect of the present invention, the opening is circular, and the first recessed portion is an enlarged diameter portion obtained by enlarging the diameter of the circle.

[0016] Furthermore, in the tip structure portion according to one aspect of the present invention, the opening has a circular shape, and the first recess has a semicircular shape having a smaller diameter than the circular shape.

[0017] In addition, in the front end structure portion according to one aspect of the present invention, the first recessed portion has a depth of 0.3 mm or more.

[0018] Furthermore, in the distal end structure portion according to one aspect of the present invention, a second recessed portion is formed in the distal end member, the second recessed portion being recessed from the opening in a direction in which the first direction is bent with respect to the second direction.

[0019] In the distal end structure according to one aspect of the present invention, the distal end member includes a distal end surface intersecting with a longitudinal direction of the insertion portion and a side surface along the longitudinal direction, and the opening is formed in the distal end surface.

[0020] Furthermore, in the front end structure portion according to one embodiment of the present invention, the front end component has a balloon groove for locking a balloon band, and the opening is formed at a position closer to the front end side than the balloon groove.

[0021] In the distal end structure according to one aspect of the present invention, the distal end member includes a distal end surface intersecting with the longitudinal direction of the insertion portion and a side surface along the longitudinal direction, and the opening is formed in the side surface.

[0022] In addition, in the front end structure portion of one embodiment of the present invention, the front end component has: a first balloon groove, which locks the balloon band on the base end side; and a second balloon groove, which is located closer to the front end side than the first balloon groove and locks the balloon band on the front end side, and the opening is formed between the first balloon groove and the second balloon groove.

[0023] Furthermore, an endoscope insertion portion according to one aspect of the present invention includes: a distal end structure portion; and an insertion portion having the distal end structure portion disposed at a distal end.

[0024] Furthermore, an endoscope according to one aspect of the present invention includes: a distal end structure portion; and an insertion portion having the distal end structure portion disposed at a distal end.

[0025] Furthermore, an ultrasonic endoscope according to one aspect of the present invention includes: a distal end structure; and an insertion portion having the distal end structure disposed at a distal end thereof, and an ultrasonic transducer disposed in the distal end structure.

[0026] Effects of the Invention

[0027] According to the present invention, it is possible to realize a distal end structure portion, an endoscope insertion portion, an endoscope, and an ultrasonic endoscope that prevent the distal end member from being damaged by the wire of a brush for cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 FIG. 1 is a diagram schematically showing an endoscope system according to an embodiment.

[0029] Figure 2 yes Figure 1 A-direction view.

[0030] Figure 3 yes Figure 2 B view.

[0031] Figure 4 This is a cross-sectional view of the front end structure portion perpendicular to the longitudinal direction.

[0032] Figure 5 It is a cross-sectional view of the front end structure portion along the longitudinal direction.

[0033] Figure 6 This is a diagram of the balloon water supply port as viewed from the front end side.

[0034] Figure 7 This is a schematic diagram of the brush structure.

[0035] Figure 8 This is a cross-sectional view of the front end structure portion of Modification 1 along the longitudinal direction.

[0036] Fig. 9 This is a diagram of the balloon water supply port as viewed from the front end side.

[0037] Fig.10 This is a cross-sectional view of the front end structure portion of Modification Example 2 along the longitudinal direction.

[0038] Fig.11 It is a cross-sectional view along the longitudinal direction of the front end structure portion of Modification Example 3.

[0039] Fig.12 This is a partial enlarged view of the camera unit.

[0040] Fig.13 It is a cross-sectional view of the front end component.

[0041] Fig.14 It is a partial enlarged view of the front end of the treatment instrument channel.

[0042] Fig.15 It is a cross-sectional view of the disposal instrument channel block.

[0043] Fig.16 It is a three-dimensional diagram of the disposal instrument channel block.

[0044] Fig.17 It is a cross-sectional view of the disposal instrument channel block.

[0045] Description of Reference Numerals

[0046] 1Endoscope system

[0047] 2Ultrasound endoscope

[0048] 3. Ultrasonic observation device

[0049] 4Endoscopic observation device

[0050] 5 Display device

[0051] 6 Light source device

[0052] 7 Ultrasonic vibrator

[0053] 10, 10A, 10B, 10C front end structure

[0054] 21 Insertion

[0055] 22 Operation Department

[0056] 23 Universal Cable

[0057] 24 connectors

[0058] 31 Ultrasonic cable

[0059] 41 Video Cable

[0060] 61 Fiber Optic Cable

[0061] 101 Camera Lenses

[0062] 102 lighting lens

[0063] 103 Disposal equipment protrusion

[0064] 104 Equipment lifting platform

[0065] 105 air and water supply port

[0066] 106, 106A, 106B, 106C balloon water inlet

[0067] 107 Balloon Suction Port

[0068] 111 signal cable

[0069] 112 Light Guide

[0070] 113 channel tube

[0071] 114 vibrator cable

[0072] 115 air and water supply pipe

[0073] 116 Balloon water delivery tube

[0074] 117 Balloon Suction Tube

[0075] 118 Disposal Equipment Lifting Tube

[0076] 119 Disposal Equipment Lifting Line

[0077] 121 Camera Unit

[0078] 211, 211A, 211B, 211C front end parts

[0079] 212 Bend Pipe

[0080] 213 Insertion tube

[0081] 221 Bend Knob

[0082] 222 Operating parts

[0083] 223 Disposal instrument insertion port

[0084] 300 brushes

[0085] Line 301

[0086] 302 front end piece

[0087] 303 Brush

[0088] 1060 Balloon water delivery channel

[0089] 1061 bending part

[0090] 1062 Part 1

[0091] 1063 Part 2

[0092] 1064, 1064A, 1064B, 1064C first recess

[0093] 1065A, 1065B, 1065C second recess

[0094] 1030 Disposal Equipment Channel

[0095] 1131 Disposal equipment channel block

[0096] 1131a, 1131b expansion part

[0097] 1131Ab Step

[0098] 2112 Contact Department DETAILED DESCRIPTION

[0099] Hereinafter, embodiments of the front end structure, endoscope insertion portion, and endoscope of the present invention will be described with reference to the accompanying drawings. In addition, the present invention is not limited to these embodiments. The present invention can be generally applied to the front end structure, endoscope insertion portion, and endoscope.

[0100] In addition, in the description of the drawings, the same or corresponding elements are appropriately marked with the same reference numerals. In addition, it should be noted that the drawings are schematic, and the relationship between the dimensions of the elements, the ratio of the elements, etc. may be different from the actual. The drawings may also contain parts with different dimensional relationships and ratios.

[0101] (Implementation Method)

[0102] [Structure of endoscope system]

[0103] Figure 1 1 is a diagram schematically showing an endoscope system according to an embodiment. The endoscope system 1 is a system for performing ultrasonic diagnosis inside a human subject using an ultrasonic endoscope. Figure 1 As shown, the endoscope system 1 includes an ultrasonic endoscope 2 , an ultrasonic observation device 3 , an endoscope observation device 4 , a display device 5 , and a light source device 6 .

[0104] The ultrasonic endoscope 2 converts the electrical pulse signal received from the ultrasonic observation device 3 into an ultrasonic pulse by means of an ultrasonic transducer provided at its distal end, and irradiates the ultrasonic pulse to the subject, and converts the ultrasonic echo reflected by the subject into an electrical echo signal represented by a voltage change and outputs the signal.

[0105] The ultrasonic endoscope 2 usually has an imaging optical system and an imaging element, and is inserted into the digestive tract (esophagus, stomach, duodenum, large intestine) or respiratory organs (trachea, bronchi) of the subject, and can image any of the digestive tract and respiratory organs. In addition, it is possible to use ultrasound to photograph the surrounding organs (pancreas, gallbladder, bile duct, biliary tract, lymph nodes, mediastinal organs, blood vessels, etc.). In addition, the ultrasonic endoscope 2 has a light guide that guides the illumination light irradiated to the subject during optical imaging. The front end of the light guide reaches the front end of the insertion portion of the ultrasonic endoscope 2 inserted into the subject, and the base end is connected to the light source device 6 that generates the illumination light.

[0106] like Figure 1As shown, the ultrasonic endoscope 2 includes an insertion portion 21 , an operation portion 22 , a universal cable 23 , and a connector 24 .

[0107] The insertion portion 21 is a portion inserted into the subject. Figure 1 As shown in FIG. 1 , the insertion portion 21 includes: a rigid front end member 211, which is provided at the front end side of the ultrasonic endoscope 2 and holds the convex ultrasonic transducer 7; a bending tube 212, which is bent in a bending direction perpendicular to the central axis; and an insertion tube 213, which is flexible and has a central axis. The front end member 211 is provided at the front end side of the bending tube 212, the bending tube 212 is provided at the front end side of the insertion tube 213, and the insertion tube 213 is provided at the front end side of the operation portion 22. The structure of the front end of the insertion portion 21 and the structure of the bending tube 212 will be described later.

[0108] The operation portion 22 is connected to the base end of the insertion portion 21 and is a portion that receives various operations from an operator such as a doctor. Figure 1 As shown, the operation part 22 includes a bending knob 221 for receiving a bending operation to bend the bending tube 212 and a plurality of operation members 222 for performing various operations. In addition, the operation part 22 is formed with a treatment instrument insertion port 223 that communicates with a treatment instrument insertion passage and is used to insert a treatment instrument into the treatment instrument insertion passage.

[0109] The universal cable 23 is a cable extending from the operation unit 22 , and is provided with a plurality of signal cables for transmitting various signals, an optical fiber for transmitting illumination light supplied from the light source device 6 , and the like.

[0110] The connector 24 is provided at the front end of the universal cable 23. The connector 24 includes a first connector portion 241 connected to the ultrasonic cable 31, a second connector portion 242 connected to the video cable 41, and a third connector portion 243 connected to the optical fiber cable 61.

[0111] The ultrasonic observation device 3 is connected to the ultrasonic cable 31 (see Figure 1 ) is electrically connected to the ultrasonic endoscope 2, outputs a pulse signal to the ultrasonic endoscope 2 via the ultrasonic cable 31, and inputs an echo signal from the ultrasonic endoscope 2. Then, the ultrasonic observation device 3 performs a predetermined process on the echo signal to generate an ultrasonic image.

[0112] The endoscope observation device 4 is connected to the video cable 41 (see Figure 1 ) is electrically connected to the ultrasonic endoscope 2, and an image signal from the ultrasonic endoscope 2 is input via a video cable 41. Then, the endoscopic observation device 4 performs a predetermined process on the image signal to generate an endoscopic image.

[0113] The display device 5 is formed using liquid crystal, organic EL (Electro Luminescence), a projector, a CRT (Cathode Ray Tube), etc., and displays ultrasonic images generated by the ultrasonic observation device 3 and endoscopic images generated by the endoscopic observation device 4.

[0114] The light source device 6 is connected to the optical fiber cable 61 (see Figure 1 ) is connected to the ultrasonic endoscope 2, and supplies illumination light for illuminating the inside of the subject to the ultrasonic endoscope 2 via the optical fiber cable 61.

[0115] [Structure of the front end structure]

[0116] Figure 2 yes Figure 1 A-direction view. Figure 3 yes Figure 2 B-direction view. Figure 2 , Figure 3 As shown, in the front end structure 10 disposed at the front end of the insertion portion 21 of the ultrasonic endoscope 2, the front end of the front end component 211 is provided with: a camera lens 101 that converges light from the subject; an illumination lens 102 that irradiates illumination light into the subject; a treatment instrument protrusion 103 that allows treatment instruments such as forceps to protrude; and a treatment instrument lifting platform 104 that allows the treatment instrument to be directed toward the Figure 3 The front end member 211 has a balloon groove 2111 for locking the balloon band, and the balloon water supply port 106 is formed at a position closer to the front end side than the balloon groove 2111.

[0117] [Internal structure of the front end structure]

[0118] Figure 4 This is a cross-sectional view of the front end structure perpendicular to the length direction. Figure 4As shown, inserted inside the front end component 211 are: a signal cable 111, which transmits an image signal obtained by converting the light received by the camera lens 101; a light guide 112, which transmits illumination light to the illumination lens 102; a channel tube 113, which is inserted for a treatment instrument; a vibrator cable 114, which receives and sends signals to and from the ultrasonic vibrator 7; an air and water supply pipe 115, which transmits gas or liquid to the air and water supply port 105; a balloon water supply pipe 116, which transmits liquid to the balloon water supply port 106; a balloon suction tube 117, which transmits liquid sucked from the balloon suction port 107; a treatment instrument lifting tube 118, which is inserted for a treatment instrument lifting wire 119; and a treatment instrument lifting wire 119, which lifts the treatment instrument lifting platform according to the operation of the operating part 22.

[0119] [Structure of the balloon water delivery channel]

[0120] Figure 5 It is a cross-sectional view of the front end structure along the length direction. Figure 5 As shown, the front end structure 10 comprises: a front end component 211, which is arranged at the front end of the insertion portion 21 of the ultrasonic endoscope 2; and a balloon water supply channel 1060 as a fluid channel, which is connected to the base end side from a balloon water supply port 106 formed on the outer surface of the front end component 211, and has a bending portion 1061 arranged at a specified position between the balloon water supply port 106 and the base end side, and is connected to a balloon water supply tube 116 on the base end side.

[0121] The balloon water delivery channel 1060 includes: a first portion 1062 extending from the curved portion 1061 toward the front end side along the first direction D1 to the balloon water delivery port 106; and a second portion 1063 extending from the curved portion 1061 toward the base end side along a second direction D2 that forms a first angle A1 as an obtuse angle with the first direction D1. The second direction D2 is a direction along the length direction of the insertion portion 21, but may also be a direction intersecting the length direction of the insertion portion 21.

[0122] The front end component 211 has a front end surface intersecting the length direction of the insertion portion 21 and a side surface along the length direction, and the balloon water supply port 106 is formed on the front end surface. The front end component 211 is formed with a first recess 1064 extending from the balloon water supply port 106 to a direction ( D1 ) that is bent relative to the second direction D2 and is in the first direction D1. Figure 5 The first concave portion 1064 is recessed on the opposite side of the first concave portion 1064 (above the first concave portion 1064). The first concave portion 1064 has an inclined portion extending toward the third direction D3, and the third direction D3 forms a second angle A2 with the second direction D2 toward the front end side that is larger than the first angle A1. The depth De1 of the first concave portion 1064 is, for example, greater than 0.3 mm. In addition, the first concave portion 1064 may also be an enlarged diameter portion obtained by enlarging the diameter of a circle.

[0123] Figure 6 This is a picture of the balloon water supply port viewed from the front end. Figure 6 As shown, the balloon water delivery port 106 is circular. The first recess 1064 is semicircular with a diameter smaller than the circular shape of the balloon water delivery port 106.

[0124] 〔Structure of the brush〕

[0125] Figure 7 This is a schematic diagram of the brush structure. Figure 7 The brush 300 shown is made to protrude from the balloon water delivery port 106, so that the entire balloon water delivery channel 1060 can be cleaned. The brush 300 includes a wire 301, a front end piece 302, and a brush portion 303. The front end piece 302 is formed by riveting a metal component at the front end of the wire 301. As a result, a step portion is formed in a direction perpendicular to the length direction of the wire 301 by the front end piece 302. The height of the step portion in the direction perpendicular to the length direction of the wire 301 is less than 0.3 mm.

[0126] According to the front end structure 10 described above, since the first recess 1064 is formed in the front end component 211, the base end side surface of the front end piece 302 of the brush 300 protruding from the balloon water supply port 106 is prevented from being hooked on the edge of the balloon water supply port 106 and damaging the front end component 211.

[0127] Moreover, by setting the depth De1 of the first recess 1064 to be greater than 0.3 mm, the depth De1 of the first recess 1064 is greater than the height of the step formed by the front end piece 302, thereby reliably preventing the surface on the base end side of the front end piece 302 of the brush 300 protruding from the balloon water supply port 106 from being hooked on the edge of the balloon water supply port 106.

[0128] In addition, the air and water supply port 105 or the balloon suction port 107 may also adopt the same structure as in the embodiment in addition to the balloon water supply port 106. In this case as well, the tip member can be prevented from being damaged by the brush wire for cleaning.

[0129] Alternatively, the front end component 211 may have a front end surface intersecting the length direction of the insertion portion 21 and a side surface along the length direction, and the balloon water supply port 106 may be formed on the side surface. Alternatively, the front end component 211 may have: a first balloon groove, which locks the balloon band on the base end side; and a second balloon groove, which is located closer to the front end side than the first balloon groove, and locks the balloon band on the front end side, and the balloon water supply port 106 is formed between the first balloon groove and the second balloon groove.

[0130] (Variant 1)

[0131] Figure 8 This is a cross-sectional view of the front end structure portion of Modification 1 along the longitudinal direction. Fig. 9This is a picture of the balloon water supply port viewed from the front end. Figure 8 , Fig. 9 As shown, a first recess 1064A is formed in the front end component 211A of the front end structure portion 10A, and the first recess 1064A extends from the balloon water delivery port 106A to a direction that is bent in the first direction relative to the second direction ( Figure 8 Furthermore, the front end member 211A is provided with a second recess 1065A which is recessed from the balloon water delivery port 106A in a direction bent in the first direction relative to the second direction.

[0132] According to the front end structure 10A described above, since the first recess 1064A is formed in the front end component 211A, the base end side surface of the front end piece 302 of the brush 300 protruding from the balloon water supply port 106A is prevented from being hooked on the edge below the balloon water supply port 106A and damaging the front end component 211A.

[0133] Moreover, according to the front end structure 10A, since the second recess 1065A is formed in the front end component 211A, the base end side surface of the front end piece 302 of the brush 300 protruding from the balloon water supply port 106A is prevented from being hooked on the upper edge of the balloon water supply port 106A and damaging the front end component 211A.

[0134] (Variant 2)

[0135] Fig.10 FIG. 2 is a cross-sectional view of the front end structure of Modification Example 2 along the length direction. Fig.10 As shown, a first recess 1064B is formed in the front end component 211B of the front end structure portion 10B, and the first recess 1064B extends from the balloon water delivery port 106B to a direction that is bent in the first direction relative to the second direction ( Fig.10 The first concave portion 1064B has a smooth curved surface that is R-shaped toward the front end side. In addition, a second concave portion 1065B is formed in the front end component 211B, and the second concave portion 1065B is concave from the balloon water delivery port 106B in a direction that is bent in the first direction relative to the second direction.

[0136] According to the front end structure 10B described above, since the first recess 1064B is formed in the front end component 211B, the base end side surface of the front end piece 302 of the brush 300 protruding from the balloon water supply port 106B is prevented from being hooked on the edge below the balloon water supply port 106B and damaging the front end component 211B.

[0137] Moreover, according to the front end structure 10B, since the second recess 1065B is formed in the front end component 211B, the base end side surface of the front end piece 302 of the brush 300 protruding from the balloon water supply port 106B is prevented from being hooked on the upper edge of the balloon water supply port 106B and damaging the front end component 211B.

[0138] (Variant 3)

[0139] Fig.11 : is a cross-sectional view along the length direction of the front end structure of modification example 3. Fig.11 As shown, a first recess 1064C is formed in the front end component 211C of the front end structure portion 10C, and the first recess 1064C extends from the balloon water delivery port 106C to a direction that is bent in the first direction relative to the second direction ( Fig.11 The first recess 1064C has an inclined portion extending toward the front end side and toward the third direction D31, and the third direction D31 forms a second angle A21 with the second direction D2 that is larger than the first angle A1. In addition, the second angle A21 is the smaller angle of the angle from the second direction D2 toward the third direction D31 counterclockwise and the angle from the second direction D2 toward the third direction D31 clockwise as in modification 3. In the case where the second angle A21 is an angle from the second direction D2 toward the third direction D31 clockwise, it is sufficient as long as it satisfies 90°<second angle A21≤180°. In addition, a second recess 1065C is formed in the front end part 211C, and the second recess 1065C is recessed from the balloon water supply port 106C to the direction in which the first direction is bent relative to the second direction.

[0140] According to the front end structure 10C described above, since the first recess 1064C is formed in the front end component 211C, the base end side surface of the front end piece 302 of the brush 300 protruding from the balloon water supply port 106C is prevented from being hooked on the edge below the balloon water supply port 106C and damaging the front end component 211C.

[0141] Moreover, according to the front end structure 10C, since the second recess 1065C is formed in the front end component 211C, the base end side surface of the front end piece 302 of the brush 300 protruding from the balloon water supply port 106C is prevented from being hooked on the upper edge of the balloon water supply port 106C and damaging the front end component 211C.

[0142] [Structure of the camera unit]

[0143] Fig.12 This is a partial enlarged view of the camera unit. Fig.12As shown, the imaging section includes: an imaging lens 101 located at the front end; an imaging unit 121 including an imaging element that converts light focused by the imaging lens 101 into an image signal; and a signal cable 111 that transmits the image signal generated by the imaging element to the endoscope observation device 4.

[0144] Fig.13 is a cross-sectional view of the front end component. Fig.13 As shown, a contact portion 2112 is formed on the front end member 211. The contact portion 2112 is formed by cutting a step from the front end side by boring. The imaging unit 121 is abutted and fixed to the contact portion 2112, and the imaging lens 101 is mounted to form an imaging unit.

[0145] In contrast, when boring from the base end, a processing hole is formed on the side, so a cover structure is required to fill the processing hole. The cover structure is not preferred from the perspective of reprocessing and cost, so the cover structure can be avoided by boring from the front end side.

[0146] [Structure of the disposal instrument channel]

[0147] Fig.14 This is a partial enlarged view of the front end of the disposal instrument channel. Fig.14 As shown, the treatment instrument channel 1130 includes: a treatment instrument channel block 1131 disposed on the proximal end side of the treatment instrument protruding opening 103 ; and a channel tube 113 connected to the proximal end side of the treatment instrument channel block 1131 .

[0148] Fig.15 is a cross-sectional view of the disposal device channel block. Fig.15 As shown, the treatment instrument channel block 1131 is provided with enlarged diameter parts 1131a and 1131b having an inner diameter larger than the base end side of the inclined part inclined toward the treatment instrument protrusion port 103. As a result, the inner diameter Di2y of the front end side of the inclined part is larger than the inner diameter Di1 of the base end side of the inclined part.

[0149] Fig.16 is a three-dimensional diagram of the disposal equipment channel block. Fig.16 As shown, the enlarged diameter parts 1131a and 1131b are arranged in the longitudinal direction (y direction), so the inner diameter Di2y in the longitudinal direction is larger than the inner diameter Di2x in the transverse direction (x direction). As a result, the front end side of the treatment instrument channel block 1131 forms an oblong opening.

[0150] return Fig.14When a large-diameter treatment tool T is inserted into the treatment tool channel 1130 and the treatment tool T is lifted, point P1 becomes a force point and point P2 becomes a fulcrum. The position of the fulcrum, i.e., point P2, is offset toward the front end due to the diameter expansion portion 1131a. As a result, the distance between point P1, which is a force point, and point P2, which is a fulcrum, becomes closer, and the reaction force becomes smaller, thereby reducing the force required to lift the treatment tool T. In addition, by offsetting the position of point P2, i.e., the fulcrum, toward the front end, the angle at which the treatment tool T is lifted can be increased.

[0151] Furthermore, since the expanded diameter portion 1131 b is formed, when the treatment instrument T is inserted into the treatment instrument channel block 1131 , the expanded diameter portion 1131 b is connected to the base end side of the inclined portion at an angle greater than 180°, thereby preventing the treatment instrument T from being caught on the inclined portion.

[0152] Fig.17 is a cross-sectional view of the disposal device channel block. Fig.17 As shown, the treatment instrument channel block 1131A may also include a step portion 1131Ab having an inner diameter larger than the base end side of the inclined portion inclined toward the treatment instrument protruding opening 103. By forming the step portion 1131Ab, when the treatment instrument T is inserted into the treatment instrument channel block 1131, the treatment instrument T is prevented from being caught on the inclined portion.

[0153] Those skilled in the art can easily derive further effects and variations. Therefore, the broader aspects of the present invention are not limited to the specific detailed and representative embodiments shown and described above. Therefore, various changes can be made without departing from the spirit or scope of the general inventive concept defined by the attached claims and their equivalents.

Claims

1. A front end structure, comprising: a front end member disposed at a front end of an insertion portion of the endoscope; and a fluid channel which communicates from an opening formed on the outer surface of the distal end member to the proximal end side and has a curved portion provided at a predetermined position between the opening and the proximal end side, The fluid channel has: A first portion extending from the bent portion toward the front end side along a first direction to the opening; and a second portion extending from the bent portion toward the base end side along a second direction forming a first angle that is an obtuse angle with the first direction, The front end member includes a first recessed portion that is recessed from the opening toward a side opposite to a direction in which the first direction is bent with respect to the second direction.

2. The front end structure according to claim 1, wherein: The first recess has an inclined portion extending toward the front end side and toward a third direction, and the third direction forms a second angle with the second direction that is larger than the first angle.

3. The front end structure according to claim 1, wherein: The second direction is a direction along the length direction of the insertion portion.

4. The front end structure according to claim 1, wherein: The opening is circular, The first recessed portion is an enlarged diameter portion obtained by enlarging the diameter of the circular shape.

5. The front end structure according to claim 1, wherein: The opening is circular, The first recessed portion has a semicircular shape having a diameter smaller than that of the circular shape.

6. The front end structure according to claim 1, wherein: The first recess has a depth of 0.3 mm or more.

7. The front end structure according to claim 1, wherein: The front end member includes a second recessed portion that is recessed from the opening in a direction in which the first direction is bent with respect to the second direction.

8. The front end structure according to claim 1, wherein: The front end member has a front end surface intersecting with the longitudinal direction of the insertion portion and a side surface along the longitudinal direction. The opening is formed at the front end surface.

9. The front end structure according to claim 8, wherein: The front end component has a balloon groove for locking a balloon band, and the opening is formed at a position closer to the front end side than the balloon groove.

10. The front end structure according to claim 1, wherein: The front end member has a front end surface intersecting with the longitudinal direction of the insertion portion and a side surface along the longitudinal direction. The opening is formed at the side surface.

11. The front end structure according to claim 10, wherein: The front end member comprises: a first balloon groove, which locks the balloon band on the base end side; and a second balloon groove, which is located closer to the front end side than the first balloon groove and locks the balloon band on the front end side. The opening is formed between the first balloon groove and the second balloon groove.

12. An endoscope insertion portion comprising: The front end structure according to claim 1; and The insertion part has the front end structure part arranged at the front end.

13. An endoscope comprising: The front end structure according to claim 1; and The insertion part has the front end structure part arranged at the front end.

14. An ultrasonic endoscope comprising: The front end structure according to claim 1; and The insertion part is provided with the front end structure part at the front end, An ultrasonic vibrator is disposed in the front end structure portion.

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