Endoscope

Abstract

An endoscope (1) has: an operation portion (3) provided at a proximal end side of an insertion portion (2); a forceps joint (28) having a treatment instrument insertion port (28a) into which a treatment instrument is inserted, the forceps joint (28) being provided to the operation portion (3) in a manner different from an axial direction of the insertion portion (2) by an axial direction of a central axis (O2) of the treatment instrument insertion port (28a); a flexible channel tube (15) extending inside the operation portion (3) in a state bent from a proximal end of the insertion portion (2) toward the forceps joint (28) and connected to the forceps joint (28) by insertion; and a guide wall (47) provided inside the operation portion (3) and capable of contacting an outer side of the bent channel tube (15) by abutting against the channel tube (15).

Description

TECHNICAL FIELD

[0001] The present application relates to an endoscope having a channel tube for performing insertion of a treatment instrument, gas or water feeding, or the like. BACKGROUND

[0002] Conventionally, endoscopes have been widely used in the medical field. An endoscope can observe an organ in a body cavity by inserting an elongated insertion section into the body cavity of a subject. Further, the endoscope has a channel tube inserted into the insertion section, and can perform various treatments using a treatment instrument inserted into the channel tube, and can perform gas or water feeding through the channel tube.

[0003] The base end side of such a channel tube is connected to a cylindrical member such as a forceps adapter provided to an operation section. In this case, the axis direction of the central axis of the forceps adapter or the like is different from the axis direction of the central axis of the insertion section of the endoscope, and thus the channel tube is arranged in a bent state inside the operation section.

[0004] Therefore, when a treatment instrument or the like is inserted from the forceps adapter or the like, a predetermined pressing force is sometimes applied to the inner wall of the bent portion of the channel tube. In order to prevent the channel tube from being detached from the forceps adapter or the like due to such a pressing force, the channel tube is generally connected to the forceps adapter or the like by adhesion or the like.

[0005] Further, for example, Japanese Patent No. 5711433 discloses a structure in which the base end of a tube is sandwiched between a cylindrical member (adapter portion) provided to a first main body portion and a second main body portion that is attached to the cylindrical member, and an O-ring is attached between the tube and the cylindrical member, thereby ensuring water and air tightness and firmly connecting the tube to the cylindrical member.

[0006] However, in order to ensure the insertability of a treatment instrument or the like, the channel tube is made of a material such as polytetrafluoroethylene that has high sliding properties. Therefore, when the channel tube is adhered to the forceps adapter or the like, etching treatment or the like for improving the adhesion properties needs to be performed, which can complicate the workability. Further, as in the technology disclosed in Japanese Patent No. 5711433 described above, the provision of an outer member such as the second main body portion can lead to a complicated configuration.

[0007] The present application was achieved in view of the above-described circumstances, and aims to provide an endoscope capable of reliably connecting the base end side of a channel tube to a cylindrical member such as an adapter by a simple structure and simple workability. SUMMARY

[0008] Means for solving the problem

[0009] An endoscope of an aspect of the present application has: an operation portion provided at a proximal end side of an insertion portion; a tubular member having an opening portion into which a treatment instrument is inserted, the tubular member being provided at the operation portion in a manner different from an axial direction of the insertion portion by an axial direction of a central axis of the opening portion; a flexible channel tube extending inside the operation portion in a state of being bent from the proximal end of the insertion portion toward the tubular member, and connected to the tubular member by being inserted into the tubular member; and an auxiliary member provided inside the operation portion, capable of contacting an outer side of the bent channel tube. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 is a left side view of an endoscope.

[0011] Figure 2 is a cross-sectional view of a main portion of an operation portion.

[0012] Figure 3 is an exploded perspective view of a main portion of an operation portion.

[0013] Figure 4 is an explanatory view of a component of a force to push a treatment instrument.

[0014] Figure 5 relates to a first modification example, and is a cross-sectional view of a main portion of an operation portion.

[0015] Figure 6 relates to a second modification example, and is a cross-sectional view of a main portion of an operation portion.

[0016] Figure 7 is the same as above, and is a perspective view of a channel tube inserted into a guide tube.

[0017] Figure 8 relates to a third modification example, and is a cross-sectional view of a main portion of an operation portion.

[0018] Figure 9 is the same as above, and is a perspective view of a channel tube supported by a guide piece. DETAILED DESCRIPTION

[0019] Hereinafter, an aspect of the present application will be described with reference to the drawings. The drawings relate to an embodiment of the present application, Figure 1 is a side view of an endoscope.

[0020] Figure 1The illustrated endoscope 1 is, for example, an endoscope suitable for observation and treatment of a renal pelvis, ureter, or the like, and in the present embodiment, is a disposable endoscope not premised on reuse. The endoscope 1 is configured mainly of the following parts: an elongated insertion section 2 inserted into a subject; and an operation section 3 connected to a base end side of a length axis (central axis) O1 of the insertion section 2 via a breakage prevention section 4.

[0021] The insertion section 2 is configured mainly of, in order from a distal end side in the direction of the length axis O1, a distal end section 10, a bending section 11, and a flexible tube section 12.

[0022] Inside the distal end section 10, for example, a camera unit connected to a signal line, an illumination optical system that irradiates a subject with illumination light transmitted by a light guide bundle (both not illustrated), or the like is provided.

[0023] Also, the distal end section 10 is provided with a channel opening section 10a connected to a distal end of a channel tube 15 (refer to Figure 2 , 3 ) described later.

[0024] The bending section 11 is configured to bend freely in, for example, four directions of up, down, left, and right, in conjunction with operation of a bending operation lever 25 described later provided to the operation section 3.

[0025] The flexible tube section 12 is configured of a tubular member having flexibility.

[0026] The operation section 3 has, for example, a substantially rectangular parallelepiped-shaped casing 20 that is long in the direction of the length axis O1 of the insertion section 2, and a region from a middle of the operation section 3 to the base end side is set as a grip section 21 for gripping the operation section 3 by a user or the like.

[0027] In addition, the base end of the operation section 3 is provided with the bending operation lever 25. In the present embodiment, the bending operation lever 25 is, for example, a lever-type operation lever, and is configured to be observed from a user gripping the grip section 21 in a manner that the bending operation lever 25 is oriented downward from the distal end side (the insertion section 2 side), and to be able to tilt in all directions including front, back, left, and right directions. Also, the user or the like is able to perform a tilting operation on the bending operation lever 25, for example, by a thumb of a hand gripping the grip section 21. In addition, in order to cause the bending section 11 to perform a bending action in conjunction with tilting of the bending operation lever 25, the bending operation lever 25 is connected to, for example, four bending operation wires (not illustrated) that extend from the insertion section 2 to the inside of the operation section 3, but these structures are known, and thus the explanation is omitted.

[0028] Additionally, a front protrusion 22, roughly triangular in shape when viewed from the side, is provided on the front side of the operation unit 3, located closer to the front end than the grip 21. A universal cable 26, through which signal lines, optical beams, etc., from the insertion unit 2 pass, extends from the lower surface of this front protrusion 22. More specifically, an anti-bend portion 27 is provided on the screen side of the front protrusion 22, through which the universal cable 26 extends diagonally downward.

[0029] Furthermore, a rear protrusion 23, roughly triangular in shape when viewed from the side, is provided on the rear side of the operating part 3 at a position closer to the front end than the gripping part 21. A pliers connector 28, which is a cylindrical component, protrudes from the upper surface of this rear protrusion 23. That is, to ensure good insertion of the device when the user inserts it with the hand opposite to the hand holding the gripping part 21, the pliers connector 28 of this embodiment protrudes obliquely upward from the upper surface of the rear protrusion 23. Therefore, the pliers connector 28 of this embodiment is configured such that the central axis O2 of the device insertion port 28a, which serves as an opening, is axially different from the central axis O1 of the insertion part 2 (i.e., inside the operating part 3, the central axis O2 intersects the central axis O1).

[0030] Inside the operating section 3, the pliers are connected to the channel tube 15 extending from the insertion section 2 via a connector 28. Here, in order to improve the insertion of the handling instrument, the channel tube 15 is made of a material with good sliding properties, such as polytetrafluoroethylene.

[0031] Next, refer to Figure 2 , 3 The structure of the front end of the operating unit 3 will be described.

[0032] like Figure 3 As shown, the housing 20 constituting the operation unit 3 of this embodiment is formed by dividing the right side into a first housing component 30, which mainly constitutes the right side portion, and a second housing component 31, which mainly constitutes the left side portion.

[0033] On the wall portion of the front end face of the first housing component 30 and the second housing component 31, a recess 35 is provided. The recess 35 is semi-circular in shape with a diameter approximately the same as the base end side of the anti-bend portion 4. Furthermore, a semi-circular key 36 protruding in the radially inward direction is provided in each recess 35.

[0034] When the first housing component 30 and the second housing component 31 are joined, the recesses 35 and the keys 36 form a stepped through hole that is circular in shape. The recesses 35 and the keys 36 are used to hold the base end of the insertion part 2 in the operation part 3 by means of the anti-bend part 4.

[0035] To achieve this retention, a keyway 4a is provided on the base end side of the anti-bend portion 4 to engage with each key 36.

[0036] Also, when the first housing member 30 and the second housing member 31 are joined, the base end portion of the fold-preventing portion 4 is held between the recesses 35, and the keys 36 are engaged with the key grooves 4a. Thus, the fold-preventing portion 4 of the base end side of the insertion portion 2 is fixed in a state of being positioned in a prescribed manner with respect to the housing 20. Also, by this fixation of the fold-preventing portion 4, the base end side of the insertion portion 2 is connected to the operation portion 3.

[0037] In addition, in the first housing member 30 and the second housing member 31, a recess 37 is provided in the wall portion that forms the lower surface of the front-side protrusion portion 22, and the recess 37 is in a semicircular shape with substantially the same diameter as the base end side of the fold-preventing portion 27. Also, a key 38 that protrudes in a semicircular shape toward the radially inner side is provided in each of the recesses 37.

[0038] When the first housing member 30 and the second housing member 31 are joined, these recesses 37 and keys 38 form a through-hole that is circular as a whole and has a stepped portion, and these recesses 35 and keys 36 are used to hold the base end side of the general-purpose cable 26 by means of the fold-preventing portion 27.

[0039] In order to achieve such holding, a key groove 27a that engages with each of the keys 38 is provided in the base end side of the fold-preventing portion 27.

[0040] Also, when the first housing member 30 and the second housing member 31 are joined, the base end portion of the fold-preventing portion 37 is held between the recesses 37, and the keys 38 are engaged with the key grooves 27a. Thus, the fold-preventing portion 27 of the base end side of the general-purpose cable 26 is fixed in a state of being positioned in a prescribed manner with respect to the housing 20. That is, by this fixation of the fold-preventing portion 27, the base end side of the general-purpose cable 26 is connected to the operation portion 3.

[0041] In addition, in the first housing member 30 and the second housing member 31, a recess 39 is provided in the wall portion that forms the upper surface of the rear-side protrusion portion 23, and the recess 39 is in a semicircular shape with a diameter larger than the outer diameter of the pliers joint 28. Also, a key 40 that protrudes in a semicircular shape toward the radially inner side is provided in each of the recesses 39.

[0042] When the first housing member 30 and the second housing member 31 are joined, these recesses 39 and keys 40 form a through-hole that is circular as a whole and has a stepped portion, and the middle of the pliers joint 28 is held in the operation portion 3.

[0043] In order to achieve such holding, a pair of outward flanges 28b that have substantially the same diameter as the recess 39 is provided at intervals of substantially the same width as the key 40 in the middle of the pliers joint 28.

[0044] Furthermore, when the first housing component 30 and the second housing component 31 are engaged, each outwardly projecting flange 28b is held between each recess 39 by clamping each key 40. Thus, the pliers connector 28 is fixed in a state in which it is positioned relative to the operating part 3 in a predetermined manner, with its base end side protruding outward from the housing 20 and its front end side disposed inside the housing 20.

[0045] Here, as Figure 2 As shown, a tapered hole 28c is provided inside the pliers connector 28, which tapers midway towards the front end with the insertion port 28a of the handling instrument as its base. Furthermore, inside the pliers connector 28, the front end of the tapered hole 28c communicates with the base end of a tube insertion hole 28d, which has approximately the same diameter as the channel tube 15. Also inside the pliers connector 28, the front end of the tube insertion hole 28d communicates with the base end of a sealing member retaining hole 28e, which has a larger diameter than the tube insertion hole 28d. Through these tapered holes 28c, tube insertion holes 28d, and sealing member retaining holes 28e, a series of through holes are formed, extending from the base end of the pliers connector 28 towards the front end.

[0046] Inside the operating section 3 (housing 20), the channel tube 15 extending from the base end of the insertion section 2 is connected to the tube insertion hole 28d of the pliers connector 28 by insertion. Furthermore, in order to ensure the airtightness and liquid tightness between the pliers connector 28 and the channel tube 15, the O-ring 45, as a sealing member, is held in the sealing member retaining hole 28e with the channel tube 15 passing through it.

[0047] Specifically, inside the operating section 3, the base end of the channel tube 15 inserted into the insertion section 2 extends directly without being connected to the relay channel tube or the like.

[0048] The channel tube 15 is configured inside the operating part 3 in a state where it is bent axially from the central axis O1 of the insertion part 2 toward the central axis O2 of the pliers connector 28. Furthermore, after passing through the O-ring 45, the base end of the channel tube 15 is directly inserted into the tube insertion hole 28d in a non-adhesive state.

[0049] Furthermore, materials such as polytetrafluoroethylene (PTFE) generally have low affinity for adhesives. Therefore, when bonding a channel tube 15 made of PTFE or the like, pretreatment such as etching (tetra-etching) is required. However, in this embodiment, the channel tube 15 is inserted into the tube insertion hole 28d in a non-bonded state, so no etching is performed.

[0050] Here, inside the housing 20, at a position close to and opposite to the front end of the pliers connector 28 held in the housing 20, a partition 46 as a limiting member is provided (see reference).Figure 2 、 3 )。

[0051] The partition wall 46 is provided to prevent the O-ring 45 from falling off from the seal holder 28e. Therefore, the partition wall 46 is provided at a position where the interval between the front end of the forceps adapter 28 is smaller than the thickness of the O-ring 45 (more preferably, smaller than 1 / 2 of the thickness of the O-ring 45), for example, is formed integrally with the first housing member 30. In addition, the partition wall 46 is provided with a substantially U-shaped gap 46a, and the channel tube 15 is inserted into the tube insertion hole 28d in a state of passing through the gap 46a.

[0052] The O-ring 45 can ensure water tightness without being bonded as long as it has an outer diameter having a size that is larger than the opening provided on the front end side of the forceps adapter 28 and an inner diameter that is smaller than the outer diameter of the channel tube 15. In addition, the falling of the channel tube 15 is limited by the force with which the O-ring 45 is compressed and attempts to recover.

[0053] Further, inside the operation portion 3, at a position corresponding to at least a part of the curved region A of the channel tube 15 and at a position along the outside of the curvature of the channel tube 15, a guide wall 47 as an auxiliary member is provided.

[0054] The guide wall 47 is used to limit the movement of the treatment instrument and the like inserted from the treatment instrument insertion port 28a of the forceps adapter 28 toward the outside of the curvature of the channel tube 15 when the treatment instrument and the like pass through the curved region A inside the channel tube 15. Therefore, the guide wall 47 has a wall surface that is curved from the axial direction of the central axis O1 of the insertion portion 2 toward the axial direction of the central axis O2 of the forceps adapter 28 (i.e., a shape that is curved along the curved shape of the channel tube 15). Thus, the movement of the treatment instrument and the like toward the outside of the curvature is suppressed, and the curvature along the wall surface of the guide wall 47 is guided toward the insertion portion side of the endoscope. Here, the direction of the outside of the curvature refers to the direction toward the guide wall 47 as viewed from the curved region A inside the channel tube 15 (i.e., the direction toward the outside of the curvature of the channel tube 15 as viewed from the curved region A inside the channel tube 15).

[0055] In addition, the guide wall 47 is made of a material that is harder than the channel tube 15, thereby ensuring rigidity, for example, the guide wall 47 is formed integrally with the first housing member 30.

[0056] Further, as described above, the guide wall 47 is preferably made of a material that is harder than the channel tube 15, but for example, even if the same material is used, rigidity can be ensured by changing the thickness (thickening).

[0057] According to the embodiment of such a structure, there are provided: the operation portion 3 provided at the proximal end side of the insertion portion 2; the forceps connector 28 having a treatment instrument insertion port 28a into which the treatment instrument is inserted, the forceps connector 28 being provided at the operation portion 3 in a manner different from the axial direction of the insertion portion 2 through the central axis O2 of the treatment instrument insertion port 28a; the flexible channel tube 15 extending inside the operation portion 3 in a state bent from the proximal end of the insertion portion 2 toward the forceps connector 28 and connected to the forceps connector 28 by insertion; and the guide wall 47 provided inside the operation portion 3 and capable of contacting the outer side of the bend of the channel tube 15 by abutting against the channel tube 15, whereby the proximal end side of the channel tube 15 can be reliably connected to the forceps connector 28 with a simple structure and simple work.

[0058] That is, the structure is adopted in which the channel tube 15 is connected to the forceps connector 28 in a non-bonded state by insertion, whereby even in the case where the channel tube 15 is made of a material such as polytetrafluoroethylene having low affinity with an adhesive, the channel tube 15 can be connected to the forceps connector 28 without performing etching treatment or the like. In this case, the guide wall 47 is provided inside the first housing member 30 and capable of contacting the outer side of the bend of the channel tube 15, whereby when the treatment instrument or the like is inserted into the channel tube 15, even in the case where a force pressing the channel tube 15 toward the outer side of the bend is generated in the bent region A of the channel tube 15, the channel tube 15 can be more reliably prevented from falling off from the forceps connector 28 compared with the case where only the O-ring is provided.

[0059] Further, as shown in Figs. 1 and 2, the angle a of the central axis O2 of the opening (treatment instrument insertion port 28a) of the forceps connector 28 with respect to the tangent T at the position where the guide wall 47 and the central axis O2 of the opening of the forceps connector 28 intersect with respect to the guide wall 47 is 45 degrees or less, whereby with respect to the force F for inserting the treatment instrument or the like, the force in the direction parallel to the guide wall 47 (i.e., the force F2 for advancing inside the channel tube 15) is larger than the force in the direction perpendicular to the guide wall 47 (i.e., the force Fl for pressing the guide wall 47), and thus the channel tube 15 is less pressed in, and thus the falling off of the channel tube 15 can be further expected to be prevented. Figure 2 4 Further, as shown in Figs. 1 and 2, the angle a of the central axis O2 of the opening (treatment instrument insertion port 28a) of the forceps connector 28 with respect to the tangent T at the position where the guide wall 47 and the central axis O2 of the opening of the forceps connector 28 intersect with respect to the guide wall 47 is 45 degrees or less, whereby with respect to the force F for inserting the treatment instrument or the like, the force in the direction parallel to the guide wall 47 (i.e., the force F2 for advancing inside the channel tube 15) is larger than the force in the direction perpendicular to the guide wall 47 (i.e., the force Fl for pressing the guide wall 47), and thus the channel tube 15 is less pressed in, and thus the falling off of the channel tube 15 can be further expected to be prevented.

[0060] ​Further, the connection of the forceps nozzle 28 to the channel tube 15 is a structure that is achieved by non-adhesion and only by insertion, and therefore, compared to a structure in which the channel tube 15 is connected to the front end side of the forceps nozzle 28 by adhesion or the like, the length of the channel tube 15 from the base end of the insertion section 2 to the forceps nozzle 28 does not need to be managed so strictly. That is, for example, even in a case in which the insertion depth of the channel tube 15 with respect to the tube insertion hole 28d is slightly shallow, as long as a length that is sufficient to maintain the inserted state of the channel tube 15 is ensured in the tube insertion hole 28d, even if the length of the channel tube 15 that extends from the base end of the insertion section 2 is slightly shortened due to manufacturing error or the like, this manufacturing error or the like can be absorbed by the tube insertion hole 28d. Therefore, the management of the length of the channel tube 15 becomes easy, and workability can be further improved.

[0061] However, the endoscope 1 of the present embodiment is a disposable endoscope, and does not need cleaning under high temperature and high pressure, and therefore, as long as the treatment instrument is inserted through the channel tube 15, sealing of the connection section at which the forceps nozzle 28 is connected to the channel tube 15 is not particularly needed. On the other hand, if the outer periphery of the channel tube 15 and the seal piece holding section 28e that constitutes the inner periphery of the forceps nozzle 28 are sealed by the O-ring 45 that is a sealing member, the air and liquid tightness of the connection section at which the forceps nozzle 28 is connected to the channel tube 15 can be ensured. If such a sealing structure is adopted, not only the insertion of the treatment instrument or the like, but also the channel tube 15 can be used as a channel for air or water supply. In this case, by providing the wall section 46 that opposes the front end of the forceps nozzle 28 inside the first housing member 30, the O-ring 45 can be reliably prevented from falling off from the forceps nozzle 28 by a simple structure, and the sealing property can be maintained.

[0062] Further, the partition wall 46 and the guide wall 47 are integrally formed in the first housing member 30, and therefore, an increase in the number of components can be reliably suppressed, and a simplification of the structure can be achieved.

[0063] Here, the guide wall 47 can be in contact with the outer side of the bend of the channel tube 15, but is not limited to a case in which the guide wall 47 is provided in advance to be in contact with the outer side of the bend of the channel tube 15, and a gap can be provided between the guide wall 47 and the channel tube 15 to such an extent that the channel tube 15 does not fall off from the forceps nozzle 28, and the channel tube 15 can be brought into contact with the guide wall 47 by being pressed in the direction of the outer side of the bend.

[0064] Here, in the above-described embodiment, an example of a structure in which the guide wall 47 is integrally formed in the first housing member 30 is described, but for example, the guide wall 47 can be integrally formed in the second housing member 31.

[0065] Further, the guide wall 47 can also be provided to a component that is supported by at least either one of the first and second housing members 30, 31. For example, as shown in FIG. 19, the guide wall 47 can be provided to the second housing member 31. Figure 5As shown in FIG. 6, the guide wall 47 can be formed integrally with the pincer joint 28 supported between the first and second housing members 30, 31. Also, although not shown, the guide wall 47 can be provided as a stay or the like that reinforces the housing 20.

[0066] In addition, as shown in FIG. 7, for example, the guide wall 47 can be replaced by a curved tube 48 through which the passage tube 15 is inserted. Figure 6 、 7 As shown in FIG. 8, the curved tube 48 can be replaced by a sheet 50 that is disposed in contact with the passage tube 15 and covers the passage tube 15.

[0067] In this case, as shown in FIG. 9, for example, the curved tube 48 is curved to the same shape as the curved shape in which the passage tube 15 is to be disposed inside the operation section 3. In addition, the length of the curved tube 48 is preferably set to a length such that one end of the curved tube 48 abuts against the base end of the insertion section 2 or the base end of the anti-kinking section 4, and the other end abuts against the partition wall 46. Figure 6

[0068] In addition, as shown in FIG. 10, for example, the guide wall 47 can be replaced by a sheet 50 that is disposed in contact with the passage tube 15 and covers the passage tube 15. Figure 8 、 9 As shown in FIG. 11, the sheet 50 can be disposed inside the first housing member 30, and a plurality of wires 52 can be used to link the sheet 50 to a support pin 51, whereby the sheet 50 can be disposed inside the operation section 3 in a state of being curved along the curved shape of the passage tube 15.

[0069]

[0070] Furthermore, the present application is not limited to the embodiments described above, and various modifications and changes can be made thereto, and they also fall within the technical scope of the present application.​​

Claims

1. An endoscope, characterized by, Having: an operation portion provided at the proximal end side of the insertion portion; a cylindrical member having an opening portion into which a treatment instrument is inserted, the cylindrical member being provided at the operation portion in a manner different from the axial direction of the insertion portion with respect to the central axis of the opening portion; a flexible channel tube extending inside the operation portion in a state bent from the proximal end of the insertion portion toward the cylindrical member, and connected to the cylindrical member by being inserted into the inside of the cylindrical member; an auxiliary member provided inside the operation portion, capable of contacting the outer side of the bent channel tube, a sealing member disposed between the inner periphery of the distal end side of the cylindrical member and the outer periphery of the channel tube; and a restriction member provided opposite the opening of the distal end side of the cylindrical member, restricting the movement of the sealing member, the restriction member being provided with a U-shaped gap, and the channel tube being inserted into the tube insertion hole of the cylindrical member in a state passing through the gap.

2. The endoscope according to claim 1, wherein the auxiliary member is formed integrally with the operation portion.

3. The endoscope according to claim 1, wherein the auxiliary member is provided at the cylindrical member.

4. The endoscope according to claim 1, wherein the auxiliary member is provided in contact with the outer side of the bent channel tube.

5. The endoscope according to claim 4, wherein the auxiliary member is a wall surface provided along the bend of the channel tube.

6. The endoscope according to claim 4, wherein the auxiliary member is provided in contact with the channel tube.

7. The endoscope according to claim 1, wherein the auxiliary member covers the channel tube.

8. The endoscope according to claim 1, wherein the auxiliary member is harder than the channel tube.

9. The endoscope according to claim 8, wherein the auxiliary member is a different material from the channel tube.

10. The endoscope according to claim 1, wherein the restriction member is configured so that the interval between the distal end of the cylindrical member and the restriction member is smaller than the thickness of the sealing member.

11. The endoscope according to claim 10, wherein the sealing member is an O-ring.

12. The endoscope according to claim 3, wherein the angle formed by the central axis of the opening of the cylindrical member and the auxiliary member is 45 degrees or less.

13. The endoscope according to claim 1, wherein the auxiliary member restricts the movement of the channel tube in the direction of the outer side by contacting the channel tube. ​

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