Endoscope

Abstract

To provide an endoscope that can clean or sterilize an erection base storing part more reliably with a simple configuration.SOLUTION: An endoscope includes: a tip (10) in which an erection base storing part (34) is formed; an erection base (30) disposed in the erection base storing part; and a treatment instrument insertion passage (50) communicated to a treatment tool outlet (58) that is open to the erection base storing part. The treatment instrument insertion passage includes an enlarged diameter part (56) of which diameter is enlarged toward the treatment tool outlet.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an endoscope, and more particularly to an endoscope equipped with a stand. [Background technology]

[0002] In an endoscope, various treatment tools are inserted into a treatment tool insertion port provided in an operating section, and are led out from a treatment tool outlet opening at a tip portion. Then, the treatment tools led out from the treatment tool outlet are used to perform treatment such as sampling or treatment of tissue in a subject. For example, a treatment tool such as a guide wire or a contrast tube is used in a duodenoscope, and a treatment tool such as a puncture needle is used in an ultrasound endoscope.

[0003] The above-mentioned treatment tool is displaced or bent in order to face a desired position inside the subject and perform treatment. For this reason, a treatment tool erection mechanism (standing stand) for changing the direction in which the treatment tool is introduced is provided at the tip of the endoscope.

[0004] In an endoscope equipped with a stand as described above, bodily fluids of the subject (e.g., tissue fluid, blood, digestive fluid, etc.) may enter the stand housing section in which the stand is housed. For this reason, the endoscope needs to be cleaned and disinfected every time it is used. Here, a cleaning liquid such as functional water, such as strong acidic electrolyzed water or ozone water, or water is used to clean the endoscope. Also, a disinfectant such as a high-level disinfectant (glutaraldehyde, orthophthalaldehyde, or ethane peroxoic acid) is used to disinfect the endoscope. In the following description, the cleaning liquid or disinfectant will be referred to as a liquid for cleaning or disinfection.

[0005] When cleaning and disinfecting the stand-up platform housing, the flow of the cleaning or disinfecting liquid may be hindered by tools such as the stand-up platform arranged inside the stand-up platform housing, resulting in insufficient cleaning and disinfection. In the endoscope described in Patent Document 1, in order to prevent insufficient cleaning and disinfection, a liquid inlet (hereinafter, liquid inlet) and a liquid outlet (hereinafter, liquid outlet) are formed on the wall surface of the stand-up platform housing. Then, liquid is injected into the stand-up platform housing from the liquid inlet and discharged from the liquid outlet. More specifically, in Patent Document 1, a liquid inlet is formed toward the stand-up platform arranged in the stand-up platform housing, and a liquid outlet is formed on the wall surface below the stand-up platform, thereby flowing liquid to the underside of the stand-up platform and preventing incomplete cleaning and disinfection of the underside of the stand-up platform. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] International Publication No. 2018 / 145433 Summary of the Invention [Problem to be solved by the invention]

[0007] When a liquid inlet is provided on the wall of the stand housing as in Patent Document 1, bodily fluids may also enter the liquid inlet path through the liquid inlet opening in the stand housing, which makes it necessary to clean and disinfect the liquid inlet and the liquid inlet path.

[0008] However, as described above, since the liquid inlet is formed facing the stand, the stand becomes an obstacle to cleaning and disinfecting the liquid inlet and the liquid injection path. For example, when a cleaning brush is inserted into the liquid injection path and then removed to the opposite side to perform cleaning, the stand becomes an obstacle to operating the cleaning brush.

[0009] Furthermore, the endoscope described in Patent Document 1 requires a space for providing a liquid injection path, which increases the size (diameter) of the tip of the endoscope that is inserted into the body cavity of the subject.

[0010] The present invention has been made in consideration of the above circumstances, and has an object to provide an endoscope in which the standing table housing section can be reliably cleaned or disinfected using a simple structure. [Means for solving the problem]

[0011] The endoscope according to the first aspect of the present invention comprises a tip portion having a stand-up table housing portion formed therein, a stand-up table arranged in the stand-up table housing portion, and a treatment tool insertion passage communicating with a treatment tool outlet opening into the stand-up table housing portion, and the treatment tool insertion passage has an expanding portion that expands in diameter toward the treatment tool outlet.

[0012] The endoscope of the first aspect according to the second aspect of the present invention is provided with a wire insertion passage through which an operating wire is inserted, the wire insertion passage and the stand are arranged on opposite sides of a partition, the partition is provided with a through hole that penetrates between the side on which the wire insertion passage is arranged and the side on which the stand is arranged, and is provided with a power transmission member that is inserted into the through hole, one end of which is connected to the stand and the other end of which is connected to the operating wire.

[0013] In the endoscope according to the third aspect of the present invention, in the second aspect, the power transmission member comprises a rotating shaft to which a standing stand is connected at one end, and a standing lever provided at the other end of the rotating shaft and to which an operating wire is connected.

[0014] In the fourth aspect of the present invention, in the endoscope of the first aspect, a wire insertion passage through which an operating wire is inserted is provided, the stand is rotatably arranged in the stand housing section, and the operating wire is connected to the stand.

[0015] A fifth aspect of the present invention is an endoscope in any one of the first to fourth aspects, wherein the stand-up table housing section is provided with an opening that opens in a first direction having a component in a direction perpendicular to the opening direction of the treatment tool outlet, and in a cross section of the expansion section along a plane determined by the opening direction of the treatment tool outlet and the first direction, an extension line of the bottom of the expansion section on a second direction side opposite to the first direction is located on the second direction side of the rotation axis of the stand-up table.

[0016] A sixth aspect of the present invention is an endoscope in which, in any of the first to fifth aspects, the stand-up table accommodating section is provided with an opening that opens in a first direction having a component in a direction perpendicular to the opening direction of the treatment instrument outlet, and the stand-up table has a treatment instrument guiding surface that guides the treatment instrument led out from the treatment instrument outlet toward the opening, and in a cross section of the treatment instrument insertion passage along a plane determined by the opening direction of the treatment instrument outlet and the first direction, an extension line of the bottom of the connection part connected to the base end side of the enlarged diameter part of the treatment instrument insertion passage on a second direction side opposite to the first direction intersects with the treatment instrument guiding surface.

[0017] According to a seventh aspect of the present invention, in the endoscope of any one of the first to sixth aspects, the treatment tool outlet also serves as a liquid supply port that supplies a cleaning or disinfecting liquid to the stand.

[0018] An eighth aspect of the present invention relates to an endoscope according to the seventh aspect, wherein the stand has a liquid guide surface that guides liquid supplied to the stand in a direction in which the rotation axis of the stand is provided.

[0019] According to a ninth aspect of the present invention, in the endoscope of the eighth aspect, the liquid guiding surface is provided at a position facing the treatment tool outlet when the standing table is in an upright state. Effect of the Invention

[0020] According to the present invention, by providing an expanding diameter section that expands in diameter from the treatment tool insertion passage toward the treatment tool outlet, the standing table housing section can be reliably cleaned or disinfected. [Brief description of the drawings]

[0021] [Figure 1] 1 is an exploded perspective view showing a tip portion of an endoscope according to a first embodiment of the present invention. [Diagram 2] 1 is a perspective cross-sectional view showing a tip portion of an endoscope according to a first embodiment of the present invention. [Diagram 3] 1A to 1C are cross-sectional views showing a comparison between the tip portion of an endoscope according to a first embodiment of the present invention and a comparative example. [Figure 4] 13A and 13B are diagrams showing modified examples of the enlarged diameter portion. [Diagram 5] 6 is a cross-sectional view showing a tip portion of an endoscope according to a second embodiment of the present invention. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an endoscope according to the present invention will now be described with reference to the accompanying drawings.

[0023] [First embodiment] The endoscope according to this embodiment includes an operation section that is held by a practitioner to perform various operations, and an insertion section that is inserted into a body cavity of a subject (patient). Note that illustration of the operation section and the insertion section is omitted.

[0024] The insertion section is long and extends from the tip of the operating section, and includes, from the operating section side (base end side), a flexible soft section, a bending section that bends by operating the angle knob of the operating section, and a tip section.

[0025] The operation section is provided with a treatment tool inlet through which a treatment tool is inserted, and a treatment tool outlet through which the treatment tool is led out is provided at the distal end of the insertion section. The treatment tool inlet and the treatment tool outlet are connected via a treatment tool insertion passage.

[0026] The tip portion of the endoscope will be described below. Figures 1 and 2 are diagrams (an exploded perspective view and a perspective sectional view, respectively) showing the tip portion of an endoscope according to a first embodiment of the present invention.

[0027] 1, the tip portion 10 includes a housing portion 12 that forms the outer wall and the internal partition of the tip portion 10, and a tip cover 14 that is attached to the tip of the housing portion 12 and forms part of the outer wall of the tip portion 10. The housing portion 12 and the tip cover 14 are made of a metal material such as stainless steel.

[0028] The housing unit 12 is formed with an illumination window 20 for illuminating the inside of the subject with illumination light guided to the housing unit 12 from a light source not shown, an observation window 22 for imaging the inside of the subject using an imaging element contained in the housing unit 12, and an air / water supply nozzle 24 for supplying gas or liquid to the observation window 22.

[0029] As shown in FIG. 2, the housing 12 is formed with a stand receiving section 34 in which the stand 30 is received.

[0030] The stand 30 is made of a metal material such as stainless steel, and is attached so as to be freely rotatable about the axial direction of a rotating shaft 72 described later. In the following description, the direction along the axial direction of the rotating shaft 72 is defined as the X direction, the direction in which the stand 30 stands up and lies down is defined as the Z direction (up-down direction), and the direction perpendicular to the ZX direction is defined as the Y direction. Here, the +Z direction and the -Z direction correspond to the first direction and the second direction, respectively.

[0031] 1, an opening 16 is formed in the housing 12. The opening 16 is formed in the +Z direction (first orientation, upward), and has a component in a direction (Z direction) perpendicular to the opening direction of the treatment tool outlet 58. The treatment tool led out from the treatment tool insertion passage 50 to the treatment tool outlet 58 is guided in the direction of the opening 16 by the stand 30 in the stand housing section 34, and is led out from the opening 16 into the subject.

[0032] In addition, the housing portion 12 is provided with a partition 60 that forms the wall surface on the +X side of the standing platform accommodating portion 34, and the partition 60 is formed with a through hole 62 that penetrates between the side on which the wire insertion passage 64 is arranged and the side on which the standing platform 30 is arranged.

[0033] The standing lever 70 has a rotating shaft 72 formed via a bent portion at one end thereof, and an operating wire 74 is connected to the other end thereof. The rotating shaft 72 is inserted into a through hole 62 formed in the partition wall 60, and is inserted into the rotating shaft insertion hole 32 of the standing platform 30 so as not to rotate relative to the standing lever 70. The standing lever 70 and the rotating shaft 72 function as a power transmission member. Hereinafter, the rotating shaft 72 when inserted into the rotating shaft insertion hole 32 of the standing platform 32 is also referred to as the rotating shaft 72 of the standing platform 30.

[0034] The operation wire 74 is inserted through a wire insertion passage 64 formed on the -Y side (base end side) of the housing 12, and is connected to a standing operation lever (not shown) of the operation section of the endoscope. As shown in Fig. 1, the wire insertion passage 64 and the standing stand 30 are disposed on opposite sides of the partition wall 60.

[0035] A treatment tool outlet 58 is formed in the standing table housing section 34. As shown in Fig. 2, the treatment tool outlet 58 opens on the +Y side (tip side) of the standing table housing section 34. As described above, the treatment tool outlet 58 communicates with the treatment tool introduction port of the operation section via the treatment tool insertion passage 50 inserted through the insertion section of the endoscope. The treatment tool outlet 58 also serves as a liquid supply port that supplies cleaning or disinfecting liquid to the standing table 30.

[0036] When observing or treating the inside of a subject, the tip portion 10 is inserted into the subject, and the treatment tool inserted from the treatment tool introduction port is led out from the treatment tool outlet 58 to the stand housing portion 34. By operating the standing operation lever of the operation portion, the practitioner can displace the stand 30 between an upright state (upright position) and a lying state (lying position), and can change the lead-out direction (lead-out angle) of the treatment tool on the stand 30.

[0037] On the other hand, when cleaning or disinfecting the endoscope, a cleaning or disinfecting liquid is injected from the treatment tool introduction port of the operation unit. The cleaning or disinfecting liquid passes through the treatment tool insertion passage 50 and is supplied to the stand housing section 34 from the treatment tool outlet 58. The stand housing section 34 is provided with a liquid outlet 36 that opens on the -Z side (second direction, downward). The liquid outlet 36 is formed so as to penetrate either or both of the housing section 12 and the tip cover 14 of the tip section 10 depending on the formation position. The cleaning or disinfecting liquid is discharged to the outside of the stand housing section 34 via the liquid outlet 36.

[0038] 2, one liquid outlet 36 is provided facing downward on the opposite side (+Y side, tip side) of the stand housing 34 from the treatment tool outlet 58 that also serves as a liquid supply port, but the arrangement, number and orientation of the liquid outlet 36 are not limited to this example. A plurality of liquid outlets 36 may be provided, or may be provided diagonally with respect to the treatment tool outlet 58 depending on the shape of the stand housing 34.

[0039] 2, an expanded diameter section 56 that expands (expands in diameter) toward the treatment tool outlet 58 is formed on the +Y side (tip side) of the treatment tool insertion passage 50. The expanded diameter section 56 has a maximum diameter at the treatment tool outlet 58. Note that the expanded diameter section 56 is not formed by chamfering the treatment tool insertion passage 50, i.e., by removing the corner between the treatment tool insertion passage 50 and the stand housing section 34, but is formed as described below, and is preferably formed so as to satisfy conditions A and B.

[0040] A portion where the portion (insertion portion 52) other than the enlarged diameter portion 56 on the -Y side (operation portion side, base end side) of the treatment tool insertion passage 50 is connected to the enlarged diameter portion 56 is defined as a connection portion 54. The enlarged diameter portion 56 has the same diameter as the insertion portion 52 at the connection portion 54. In the example shown in FIG. 2, the enlarged diameter portion 56 has a minimum diameter at the connection portion 54. In the example shown in FIG. 2, the enlarged diameter portion 56 has a substantially conical shape (oblique conical shape), but the shape of the enlarged diameter portion 56 is not limited to the example shown in FIG. 2.

[0041] By providing such an enlarged diameter portion 56, the treatment tool outlet 58, which also serves as a liquid supply port, is enlarged more than the treatment tool insertion passage 50, so that liquid for cleaning or disinfection can be supplied to a wide area of ​​the standing table storage portion 34.

[0042] Furthermore, in this embodiment, it is preferable to configure the tip portion 10 so as to satisfy the following condition A or B.

[0043] (Condition A) In a cross section of the treatment tool insertion passage 50 along a plane (YZ plane) determined by the Y direction (opening direction of the treatment tool outlet 58) and the Z direction (up and down direction), an extension line of the bottom of the expanded diameter portion 56 on the -Z direction (second direction) side is defined as EX1. As shown in FIG. 2, the expanded diameter portion 56 is formed so that the extension line EX1 of the bottom is located on the -Z direction (second direction) side of the rotating shaft 72 (rotating shaft insertion hole 32) of the stand 30. This allows a cleaning or disinfecting liquid to be supplied to, for example, a connection point between the rotating shaft 72 and the rotating shaft insertion hole 32 when the rotating shaft 72 is inserted into the rotating shaft insertion hole 32 of the stand 30 (including a gap between the rotating shaft 72 and the rotating shaft insertion hole 32), a sealing member (e.g., an O-ring) provided between the through hole 62 of the partition 60 and the rotating shaft 72, or the lower surface of the stand 30.

[0044] (Condition B) In a cross section of the treatment tool insertion passage 50 along the YZ plane, an extension line of the bottom of the connecting portion 54 on the -Z direction (second direction) side is defined as EX2. As shown in FIG. 2, the positions of the insertion portion 52 and the stand 30 are adjusted so that the extension line EX2 intersects with the treatment tool guiding surface 30G of the stand 30. That is, the treatment tool guiding surface 30G is located on the extension line EX2 or is located slightly further in the -Z direction (second direction) than the extension line EX2. This allows the treatment tool to be smoothly guided even when the expanded diameter portion 56 is provided.

[0045] FIG. 3 is a cross-sectional view showing in comparison an endoscope according to the first embodiment of the present invention and an endoscope according to a comparative example.

[0046] 3, in the tip portion 10C of the endoscope according to the comparative example, a liquid supply path 40C for supplying a cleaning or disinfecting liquid is provided in addition to the treatment tool insertion path 50C in order to supply a liquid to the underside of the stand. In order to provide this liquid supply path 40C, the size of the tip portion 10C according to the comparative example in the Z direction is large.

[0047] In contrast to this, the tip portion 10 of the endoscope according to this embodiment is provided with the expanded diameter section 56, which makes it possible to supply a cleaning or disinfecting liquid to the underside of the stand 30 without providing a dedicated liquid supply path 40C. Therefore, according to this embodiment, the stand housing section 34 can be reliably cleaned or disinfected with a simpler configuration without enlarging the diameter of the tip portion 10 of the endoscope.

[0048] (Modification of the enlarged diameter portion) Although the expanded diameter portion 56 according to the present embodiment has a substantially conical shape (frustum shape), the present invention is not limited to this. The expanded diameter portion 56 may be non-axisymmetric, and the axis (center axis) of the expanded diameter portion 56 may be shifted from the axis AX of the insertion portion 52 (for example, may be shifted up or down).

[0049] FIG. 4 is a diagram showing a modified example of the enlarged diameter portion.

[0050] This is an example in which the expanded diameter portion 56a according to the modified example (a) has a non-axisymmetric shape. The expanded diameter portion 56a according to the modified example (a) is specifically shaped like an oblique cone surface, but may have another non-axisymmetric shape.

[0051] In the modified example (a), for example, the inclination of the axis AXa of the enlarged diameter portion 56a having an oblique conical surface shape may be adjusted (for example, it may be inclined toward the rotation shaft 72 of the stand 30) depending on the positional relationship between the insertion portion 52 of the treatment tool insertion passage 50 and the rotation shaft 72 (rotation shaft insertion hole 32) of the stand 30. As a result, similar to the above embodiment, the extension line EX1a of the longer main generatrix of the enlarged diameter portion 56a can be positioned on the -Z direction (second direction) side of the rotation shaft 72 of the stand 30 (Condition A).

[0052] For example, due to constraints such as the arrangement of components of the tip portion 10 or the shape of the stand 30, it may be difficult to design the axisymmetric expanded diameter portion 56 to satisfy conditions A and B. Even in such cases, by employing a non-axisymmetric expanded diameter portion 56a, it becomes possible to satisfy conditions A and B, improving the freedom of design of the tip portion 10.

[0053] The enlarged diameter portions 56b and 56c according to the modified examples (b) and (c) have a curved cross section in the YZ direction. Here, the shape of the enlarged diameter portions 56b and 56c may be, for example, a surface of revolution, a paraboloid, or a hyperboloid.

[0054] In the modified examples (b) and (c), the cross-sectional shape is curved, but in this case, the extension lines of the bottoms of the enlarged diameter portions 56b and 56c can be tangents EX1b and EX1c to the bottom cross sections of the enlarged diameter portions 56b and 56c.

[0055] In the modified examples (b) and (c), the central axes of the enlarged diameter portions 56b and 56c may be shifted or inclined with respect to the central axis AX of the insertion portion 52, depending on the positional relationship between the insertion portion 52 of the treatment instrument insertion passage 50 and the rotation shaft 72 (rotation shaft insertion hole 32) of the stand 30. In addition, the enlarged diameter portions 56b and 56c may be formed in a non-axisymmetric shape.

[0056] As shown in modified examples (a) to (c), the enlarged diameter portions (56a, 56b, and 56c) can be selected depending on the positional relationship between the insertion portion 52 of the treatment instrument insertion passage 50 and the rotation shaft 72 (rotation shaft insertion hole 32) of the standing table 30, thereby improving the freedom of design of the tip portion 10.

[0057] [Second embodiment] Fig. 5 is a cross-sectional view showing the tip portion of an endoscope according to a second embodiment of the present invention, in which a stand 30A is in an upright position.

[0058] The stand 30A according to this embodiment includes a first surface 30G1 and a second surface 30G2 that face in different directions. The first surface 30G1 and the second surface 30G2 are also called liquid guide surfaces. By providing the first surface 30G1 and the second surface 30G2, the cleaning or disinfecting liquid supplied from the treatment tool outlet 58 can flow toward both the opening 16 side and the rotating shaft 72 (rotating shaft insertion hole 32) side.

[0059] As shown in FIG. 5, when the stand 30 is in the standing position, the first surface 30G1 and the second surface 30G2 are provided on the inner (-Z) side of the facing area facing the treatment tool outlet 58. The first surface 30G1 is formed obliquely upward with respect to the axis AX of the insertion part 52 of the treatment tool insertion passage 50, and the second surface 30G2 is formed obliquely downward with respect to the axis AX of the insertion part 52 of the treatment tool insertion passage 50. That is, since the first surface 30G1 is inclined toward the opening 16 side of the stand storage part 34, the liquid that hits the first surface 30G1 can be guided toward the opening 16 side of the stand storage part 34. In addition, since the second surface 30G2 is inclined toward the rotation axis 72 side of the stand 30A, the liquid that hits the second surface 30G2 can be guided toward the rotation axis 72 side of the stand 30A.

[0060] According to this embodiment, by providing the stand 30A with liquid guide surfaces (the first surface 30G1 and the second surface 30G2), the stand housing portion 34 can be cleaned or disinfected more reliably.

[0061] The shape of the liquid guide surface is not limited to the example shown in Fig. 5. The liquid guide surface may include, for example, a plurality of surfaces whose liquid guide direction is adjusted according to the arrangement of the components of the tip portion 10. For example, the liquid guide surface may include a plurality of liquid guide surfaces capable of guiding the liquid to the region on the opposite side of the treatment tool outlet 58 with respect to the components that obstruct the flow of the liquid.

[0062] Furthermore, in each of the above embodiments, the expanded diameter portion 56 expands in diameter in both ±Z directions (both up and down directions), but it may also be configured so that it expands in diameter only in the -Z direction (second direction).

[0063] In addition, in each of the above embodiments, the stand 30 is operated via the stand lever 70, but the present invention is not limited thereto. For example, each of the above embodiments can be applied to an endoscope in which the operating wire 74 is directly connected to the stand 30 without providing a bulkhead 60, or to other types of endoscopes (for example, JP 11-299728 A, JP 2012-040258 A, and WO 2021 / 033641 A). [Explanation of symbols]

[0064] 10 Tip 12 Housing 14 Tip cover 16 Opening 20 Lighting window 22 Observation window 24 Air and water supply nozzle 30 Standing platform 30A standing platform 30G treatment tool guide surface 30G1 1st page 30G2 2nd side 32 Rotating shaft insertion hole 34 Standing platform storage area 36 Liquid outlet 50 Treatment tool passage 52 Insertion part 54 Connection 56 Expanded diameter part 56a Expanded diameter part 56b Expanded diameter part 56c Expanded diameter part 58 Treatment tool outlet 60 Bulkhead 62 Through hole 64 Wire passage 70 Standing Lever 72 Rotational Axis 74 Control wire EX1 extension line EX1a extension line EX1b extension line EX1c extension line EX2 extension line AX axis AXa axis 30G treatment tool guide surface 10C Tip 40C Liquid supply path 50C Treatment tool passage

Claims

1. A tip portion having a stand receiving portion formed therein; A stand disposed in the stand housing; a treatment tool insertion passage communicating with a treatment tool outlet opening in the stand housing section; Equipped with The treatment tool insertion passage has an enlarged diameter portion that enlarges in diameter toward the treatment tool outlet.

2. A wire insertion passage through which an operating wire is inserted is provided, The wire passage and the stand are disposed on opposite sides of a partition wall, The partition wall is provided with a through hole penetrating between a side where the wire insertion passage is arranged and a side where the stand is arranged, a power transmission member that is inserted into the through hole, one end of which is connected to the stand and the other end of which is connected to the operation wire; The endoscope according to claim 1 .

3. The power transmission member is A rotating shaft to which the stand is connected at one end thereof; a standing lever provided on the other end side of the rotating shaft and connected to the operating wire; The endoscope according to claim 2 .

4. A wire insertion passage through which an operating wire is inserted is provided, The stand is rotatably disposed in the stand housing, The operating wire is connected to the stand. The endoscope according to claim 1 .

5. The stand housing portion is provided with an opening portion that opens in a first direction having a component in a direction perpendicular to an opening direction of the treatment tool outlet, In a cross section of the enlarged diameter portion along a plane determined by the opening direction of the treatment tool outlet and the first orientation, an extension line of a bottom portion of the enlarged diameter portion on a second orientation side opposite to the first orientation is located on the second orientation side of the rotation axis of the stand. The endoscope according to any one of claims 1 to 4.

6. The stand housing portion is provided with an opening portion that opens in a first direction having a component in a direction perpendicular to an opening direction of the treatment tool outlet, the stand has a treatment tool guide surface that guides the treatment tool led out from the treatment tool outlet toward the opening, 5. An endoscope according to claim 1, wherein, in a cross section of the treatment instrument insertion passage along a plane determined by the opening direction of the treatment instrument outlet and the first orientation, an extension line of a bottom portion of a connection portion connected to a base end side of the expanded diameter portion of the treatment instrument insertion passage on a second orientation side opposite to the first orientation intersects with the treatment instrument guide surface.

7. The treatment tool outlet also serves as a liquid supply port for supplying a cleaning or disinfecting liquid to the stand. The endoscope according to any one of claims 1 to 4.

8. The stand has a liquid guide surface that guides the liquid supplied to the stand in a direction in which a rotation axis of the stand is provided. The endoscope according to claim 7.

9. The liquid guide surface is provided at a position facing the treatment tool outlet when the stand is in an upright state. The endoscope according to claim 8.

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