WO2021100123A1

WO2021100123A1 - Endoscope

Info

Publication number: WO2021100123A1
Application number: PCT/JP2019/045284
Authority: WO
Inventors: 佳紀長尾
Original assignee: オリンパス株式会社
Priority date: 2019-11-19
Filing date: 2019-11-19
Publication date: 2021-05-27
Also published as: JPWO2021100123A1; JP7245357B2

Abstract

This endoscope 100 is provided with: a leading-end member 20 which is disposed at the leading end of an insertion part 2 of the endoscope 100; a lid member 23 which covers a portion of the leading-end member 20; a first wall surface 21c which is provided to the leading-end member 20 and which has a flat plane that lies along a direction intersecting the longitudinal axis 2a of the insertion part 2; a second wall surface 23d which is provided to the lid member 23 and faces the first wall surface 21c when the lid member 23 covers a portion of the leading-end member 20; a protrusion 30A which is provided to one of the first wall surface 21c and the second wall surface 23d so as to protrude toward the other; and a recess 21c1d which is provided to the other of the first wall surface 21c and the second wall surface 23d and in which the protrusion 30A is to be fitted.

Description

Endoscope

The present invention relates to an endoscope including an insertion portion to be inserted into a subject.

Some endoscopes have a movable member at the insertion part. For example, Japanese Patent Application Laid-Open No. 2007-136044 discloses an endoscope having a standing lever and a standing stand, which are movable members, at an insertion portion.

In the endoscope disclosed in Japanese Patent Application Laid-Open No. 2007-136044, the standing lever is arranged in the lever accommodating portion which is a concave space formed in the main body of the tip portion of the insertion portion. Then, in the endoscope disclosed in Japanese Patent Application Laid-Open No. 2007-136044, the lever accommodating portion is closed by a thin plate-shaped cover.

Since endoscopes are used repeatedly, it is required to improve their resistance to physical impact. For example, in the case of an endoscope having a cover that closes the lever accommodating portion as disclosed in Japanese Patent Application Laid-Open No. 2007-136044, it is required to improve the strength of fixing the cover.

Therefore, as disclosed in International Publication WO2019 / 150633, at the time of assembly, the protrusion of the lid member was poured into the gap between the lid member and the wall surface portion while being brought into contact with the wall surface portion of the lever accommodating portion of the base portion. A technique has been proposed in which the lid member is firmly fixed to the base portion while the lid member is accurately positioned with respect to the base portion by curing the fixing resin.

However, when the fixing resin is poured into the gap between the lid member and the wall surface portion, the lid member may fall off from the base portion, and it is difficult to fix the lid member to the base portion.

The present invention solves such a problem, and an object of the present invention is to provide an endoscope having improved workability when fixing a lid member to a hard member arranged at the tip of an insertion portion.

The endoscope according to one aspect of the present invention includes a hard member arranged at the tip of an insertion portion of the endoscope, a lid member covering a part of the hard member, and a length of the insertion portion provided on the hard member. A first wall surface having a plane along a direction intersecting the axis, and a second wall surface provided on the lid member and facing the first wall surface when the lid member covers a part of the hard member. It includes a protrusion provided on one of the first wall surface and the second wall surface and projecting toward the other, and a recess provided on the other side of the first wall surface and the second wall surface into which the protrusion fits.

It is a figure which shows the schematic structure of the side-view type endoscope which concerns on embodiment of this invention. It is a perspective view of the tip part of the insertion part which concerns on embodiment of this invention. It is a perspective view which shows the tip cover and the tip member separated state which concerns on embodiment of this invention. It is a figure which shows the left side surface of the tip part in the state which the tip cover is not attached which concerns on embodiment of this invention. FIG. 5 is a sectional view taken along line VV of FIG. FIG. 4 is a sectional view taken along line VI-VI of FIG. It is an exploded perspective view of the tip member which concerns on embodiment of this invention. FIG. 5 is a sectional view taken along line VIII-VIII of FIG. It is a figure which shows the right side surface of the tip member which concerns on embodiment of this invention. It is a figure which shows the right side surface of the tip member with the lid member removed, which concerns on embodiment of this invention. FIG. 4 is a cross-sectional view taken along the line XI-XI of FIG. It is sectional drawing of the lid member and the 2nd arm part along the longitudinal axis which concerns on embodiment of this invention. It is a perspective view seen from the outer surface side on the opposite side of the contact surface of a lid member which concerns on embodiment of this invention. It is a perspective view seen from the contact surface side of the lid member which concerns on embodiment of this invention. It is sectional drawing which shows the state which a part of the protrusion of the lid member has entered into the recess, which concerns on embodiment of this invention. It is sectional drawing of the tip part which concerns on the modification 1 of the Embodiment of this invention. It is sectional drawing which showed the contact state of the base end side wall surface of the tip member, and the lid member which concerns on the modification 2 of the Embodiment of this invention. FIG. 5 is a cross-sectional view showing a state in which a part of the protrusion of the lid member according to the third modification of the embodiment of the present invention is inserted into the recess. It is sectional drawing which shows the case where the tip surface of the 2nd protrusion comes into contact with the tip side wall surface which concerns on the modification 3 of the Embodiment of this invention. FIG. 5 is a cross-sectional view showing a state in which a protrusion according to a modification 4 of the embodiment of the present invention has entered a recess. FIG. 5 is a cross-sectional view showing a state in which a protrusion has entered a recess when the lid member does not have a cut surface, according to a modification 4 of the embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In each of the drawings used in the following description, the scale is different for each component in order to make each component recognizable in the drawings. It is not limited only to the number of components, the shape of the components, the size ratio of the components, and the relative positional relationship of each component described in.

First, the overall configuration of the endoscope will be described. FIG. 1 is a diagram showing a schematic configuration of the endoscope 100. The endoscope 100 of the present embodiment includes an endoscope main body 1 and a tip cover 60. In the present embodiment, as an example, the endoscope 100 is an endoscope having an insertion portion 2 to be inserted into the human body as a subject, and more specifically, a side-view type duodenal endoscope. ..
The endoscope main body 1 includes an insertion portion 2 to be inserted into the subject, an operation portion 3 provided on the base end side of the insertion portion 2, and a universal cord 4 extending from the operation portion 3. It is configured.

The operation unit 3 is provided with a bending operation device 11, an air supply / water supply button 12, a suction button 13, a riser operation lever 14, and an operation switch 15. The operation switch 15 is an electronic switch for operating the image pickup device 42 (not shown in FIG. 1) provided in the insertion unit 2.

The operation unit 3 is provided with a treatment tool insertion port 16 for introducing a treatment tool (not shown) into the body. The base end side of the channel tube 17 is connected to the treatment tool insertion port 16. The tip end side of the channel tube 17 is open at the tip end portion 5 of the insertion portion 2.

The insertion portion 2 connects the tip portion 5 disposed at the tip, the bendable curved portion 6 disposed on the proximal end side of the distal end portion 5, and the proximal end side of the curved portion 6 and the operating portion 3. Flexible tube portions 7 are connected and configured. A tip cover 60 is attached to the tip portion 5. Details of the configuration of the tip portion 5 and the tip cover 60 will be described later.

The curved portion 6 is curved upward or downward according to the rotation of the vertical curved knob 11a of the curved operating device 11 provided in the operation unit 3, and is curved leftward or right according to the rotation of the left-right curved knob 11b. Curve in the direction.

A riser operating wire 18 (not shown in FIG. 1) is inserted into the insertion portion 2. The riser operating wire 18 moves forward and backward in the longitudinal direction in response to the swing of the riser operation lever 14. That is, the raising table operating lever 14 is an operating member for the user to operate the device for pushing and pulling the raising table operating wire 18 inserted into the insertion portion 2. The tip of the riser operating wire 18 is connected to a movable member 51 (not shown in FIG. 1), which will be described later, provided at the tip portion 5.

FIG. 2 is a perspective view of the tip portion 5. As shown in FIG. 2, a tip cover 60 is attached to the tip portion 5. The tip cover 60 is a sheath-shaped member that covers a predetermined outer surface of the tip portion 5, and is removable from the tip portion 5. FIG. 3 is a perspective view showing the tip cover 60 and the tip 5 in a separated state.

As an example in this embodiment, the tip cover 60 is formed of a resin such as polyethylene or polypropylene, which has lower elasticity than rubber or the like and is easily plastically deformed or broken. The tip cover 60 of the present embodiment is irreversibly deformed or broken when it is removed from the tip portion 5 after being attached to the tip portion 5, and cannot be reused. FIG. 3 shows a tip cover 60 in a state (unused state) that has never been attached to the tip portion 5.

The configuration of the tip portion 5 will be described. In the following description, the axis along the longitudinal direction of the elongated insertion portion 2 is referred to as a longitudinal axis 2a. Further, the direction toward the tip end side of the insertion portion 2 along the longitudinal axis 2a is referred to as the tip end direction A, and the direction opposite to the tip end direction A is referred to as the proximal end direction B. Further, two linear axes orthogonal to each other on a plane orthogonal to the longitudinal axis 2a are defined as an X axis and a Y axis. The direction toward one side along the X axis is referred to as the right direction R, and the direction opposite to the right direction R is referred to as the left direction L. Further, the direction toward one side along the Y axis is referred to as an upward direction U, and the direction opposite to the upward direction U is referred to as a downward direction D. The X-axis and the Y-axis are substantially parallel to the bending direction of the bending portion 6. In the present embodiment, as an example, when viewed from the proximal end side to the distal end side along the longitudinal axis 2a, when the X axis is horizontal, the right side is the right direction R and the upper side is the upward direction U. Suppose that

FIG. 4 is a view showing the left side surface of the tip portion 5 in a state where the tip cover 60 is not attached. Further, FIG. 5 is a sectional view taken along line VV of FIG. FIG. 6 is a sectional view taken along line VI-VI of FIG. FIG. 7 is an exploded perspective view of the tip member 20.

As shown in FIG. 3, the tip portion 5 includes a tip member 20 and an insulating portion 20j made of a resin or ceramic having electrical insulation. The tip member 20 is a hard member made of metal such as stainless steel, and is a hard member arranged at the tip of the insertion portion 2 of the endoscope main body 1. The tip member 20 includes a base portion 20a fixed to the tip end of the curved portion 6, a first arm portion 20b and a second arm portion 20c which are a pair of arm portions protruding from the base portion 20a toward the tip end direction A, and a first arm portion 20c. It has a riser accommodating space 20d, which is a space formed between the arm portion 20b and the second arm portion 20c. The outer shape of the base 20a is substantially columnar. The outer circumference of the base portion 20a is covered with an annular insulating portion 20j.

The first arm portion 20b and the second arm portion 20c are arranged so that the riser accommodating space 20d, which is a space formed between them, is opened toward three directions of the upward direction U, the downward direction D, and the tip direction A. Has been done. That is, the first arm portion 20b and the second arm portion 20c are arranged in the direction along the X axis with the riser accommodating space 20d in between. In the present embodiment, as an example, the first arm portion 20b is arranged on the left L side of the riser accommodating space 20d, and the second arm portion 20c is arranged on the right R side of the riser accommodating space 20d. ..

An illumination lens 41, an image pickup device 42, and a cleaning nozzle 43 are arranged on the upper surface of the outer peripheral surface of the first arm portion 20b facing upward U. The illumination lens 41 is for emitting illumination light toward the subject of the image pickup apparatus 42. The illumination light is guided from the light emitting device to the illumination lens through the optical fiber cable 41a inserted into the insertion portion 2. The light emitting device may be arranged in the endoscope 100, or may be arranged in an external device connected to the endoscope 100.

The field of view of the image pickup apparatus 42 is generally centered on the upward direction U. That is, the image pickup apparatus 42 has a side view of the insertion portion 2. The cleaning nozzle 43 is a portion that ejects a fluid toward the illumination lens 41 and the image pickup device 42.

As shown in FIG. 5, an image pickup device accommodation space 20e is formed inside the first arm portion 20b. The tip of the optical fiber cable 41a and the image pickup device 42 are arranged in the image pickup device accommodation space 20e.

The image pickup device accommodation space 20e communicates with the internal space of the curved portion 6 through a through hole 20f penetrating the base portion 20a. The tip of the optical fiber cable 41a and the image pickup device 42 are inserted into the image pickup device accommodation space 20e through the through hole 20f.

Further, as shown in FIG. 7, the image pickup apparatus accommodation space 20e has an opening 20g that opens on the lower surface facing the downward direction D of the first arm portion 20b. The opening 20g is closed by a plug body 20h that intrudes into the opening 20g. The plug body 20h is fixed in the opening 20g by an adhesive. Further, as shown in FIG. 5, the plug body 20h is formed with a claw 20i for hooking a tool when the plug body 20h is pulled out from the opening 20g at the time of maintenance of the endoscope 100, for example. ..

As will be described in detail later, a storage space 22 in which the movable member 51 is arranged is provided in the second arm portion 20c. The movable member 51 is a member that transmits the movement of the raising table operation wire 18 to the raising table 50.

The tip cover 60 is a sheath-shaped member that is closed on the tip direction A side and open on the base end direction B side. The opening provided on the base end direction B side of the tip cover 60 is referred to as an insertion port 60d. When the tip cover 60 is attached to the tip 5, the tip 5 is inserted into the tip cover 60 via the insertion port 60d.

The tip cover 60 has an opening 60a that exposes the riser accommodating space 20d only in the upward direction U when attached to the tip 5. Further, in a state where the tip cover 60 is attached to the tip member 20, the illumination lens 41, the image pickup device 42, and the cleaning nozzle 43 are also exposed upward through the opening 60a.

On the outer surface of the tip cover 60, the opening 60a is not connected to the insertion port 60d. Therefore, at the base end 60b of the tip cover 60, an annular portion 60e is formed in which the entire circumference is connected in an annular shape around the longitudinal axis 2a. When the tip cover 60 is attached to the tip member 20, the annular portion 60e fits on the outer circumference of the insulating portion 20j.

Next, the configuration of the accommodation space 22 provided in the second arm portion 20c of the tip member 20 and the movable member 51 arranged in the accommodation space 22 will be described.

FIG. 8 is a sectional view taken along line VIII-VIII of FIG. FIG. 9 is a view showing the right side surface of the tip member 20. FIG. 10 is a view showing the right side surface of the tip member 20 with the lid member 23 removed. FIG. 11 is a cross-sectional view taken along the line XI-XI of FIG. FIG. 12 is a cross-sectional view of the lid member 23 and the second arm portion 20c along the longitudinal axis 2a.

As shown in FIGS. 5, 6 and 7, the second arm portion 20c has a base portion 21 that is integrated with the tip member 20 and a lid member that is adhesively fixed to the base portion 21 by a fixing resin 26. 23 and. In the present embodiment, the lid member 23 is fixed to the right side surface of the base portion 21. The lid member 23 covers a part of the tip member 20. The accommodation space 22 is composed of a first recess 21a and a second recess 23a, which are recessed on the surfaces of the base portion 21 and the lid member 23 facing each other, respectively. Further, the lid member 23 is a hard member made of metal such as stainless steel, similarly to the tip member 20 described above.

More specifically, the base portion 21 includes a first recess 21a, an opening forming surface 21b, and a wall surface portion 21c. The first recess 21a is a recess of the tip member 20 that is open in the opening forming surface 21b on the surface of the base portion 21. That is, the opening forming surface 21b is a surface formed so as to surround the opening of the first recess 21a.

The shape of the opening forming surface 21b is not particularly limited, and may be composed of, for example, a single plane, a plurality of planes, or a curved surface.

In this embodiment, as an example, as shown in FIGS. 5 and 11, the opening forming surface 21b includes a pair of planes 21b1 and 21b2 arranged at angles substantially parallel to the longitudinal axis 2a and intersecting each other. The pair of planes 21b1 and 21b2 face different directions on the surface of the columnar base portion 21 so that the line of intersection of the two planes becomes a ridge line that is convex outward.

The opening forming surface 21b including the pair of planes 21b1 and 21b2 has a mountain-shaped bent shape in a cross section orthogonal to the longitudinal axis 2a.

The wall surface portion 21c is erected from the opening forming surface 21b toward the outside of the base portion 21. The wall surface portion 21c will be described later.

The lid member 23 is a member formed in a substantially flat plate shape for covering a part of the tip member 20, and includes a second recess 23a and a contact surface 23b. Further, the lid member 23 is provided with a protrusion 30A on the end face on the distal end direction A side and another protrusion 30B on the end face on the proximal end direction B side. The contact surface 23b is a surface that contacts the opening forming surface 21b. Further, the contact surface 23b is larger than the opening of the first recess 21a and comes into contact with the opening forming surface 21b over the entire circumference of the opening of the first recess 21a. Therefore, when the contact surface 23b is in contact with the opening forming surface 21b, the opening of the first recess 21a is closed by the lid member 23.

Since the outer peripheral portion of the second recess 23a, that is, the portion near the side surface 23d is thicker than the central portion where the second recess 23a is formed, the lid member 23 has a plate having the same thickness as the central portion. It has higher strength than that. The thickness of the outer peripheral portion of the second recess 23a may be designed to be sufficient for the required strength of the lid member 23.

The contact surface 23b has a shape that is in close contact with the opening forming surface 21b in order to close the first recess 21a. Specifically, in the present embodiment, since the opening forming surface 21b is bent in a mountain shape in a cross section parallel to the longitudinal axis 2a, the contact surface 23b is bent in a valley shape in accordance with the bending of the opening forming surface 21b. Has a shaped shape. That is, the contact surface 23b includes a pair of planes 23b1 and 23b2 parallel to the pair of planes 21b1 and 21b2 of the opening forming surface 21b.

As described above, since the opening forming surface 21b on the base portion 21 side has a mountain shape and the contact surface 23b on the lid member 23 side has a valley shape, the contact surface 23b is brought into contact with the opening forming surface 21b. As a result, the lid member 23 is positioned in the circumferential direction around the longitudinal axis 2a with respect to the base portion 21. In the present embodiment, the circumferential positioning of the lid member 23 with respect to the base portion 21 around the longitudinal axis 2a is the positioning in the upward direction U and the downward direction D along the Y axis.

The second recess 23a is open in the contact surface 23b. That is, the circumference of the opening of the second recess 23a is surrounded by the contact surface 23b. The second recess 23a is connected to the first recess 21a in a state where the lid member 23 closes the opening of the first recess 21a.

As described above, the accommodating space 22 has a base portion 21 and a lid so that the first recess 21a provided in the base portion 21 and the second recess 23a provided in the lid member 23 face each other. It is formed by adhering to the member 23. Therefore, on the side wall surface of the accommodation space 22, a boundary line between the base portion 21 and the lid member 23 exists at a position separated from the bottom surfaces of the first recess 21a and the second recess 23a.

Here, the side wall surface of the accommodation space 22 is a surface of the inner surface of the accommodation space 22 excluding the bottom surfaces of the first recess 21a and the second recess 23a. That is, the side wall surface of the accommodation space 22 is composed of the side walls of the first recess 21a and the second recess 23a. Further, the boundary line means that the mating surface of the base portion 21 and the lid member 23, that is, the opening forming surface 21b and the contact surface 23b appear on the side wall surface of the accommodation space 22. In the present embodiment, the mating surface of the base portion 21 and the lid member 23 is substantially parallel to the longitudinal axis 2a.

Next, the wall surface portion 21c provided on the base portion 21, the protrusion 30A provided on the lid member 23, and the other protrusions 30B will be described.

First, the wall surface portion 21c will be described. The wall surface portion 21c is erected from the opening forming surface 21b toward the outside of the base portion 21, and at least a part of the side surface 23d of the lid member 23 in a state where the contact surface 23b is in contact with the opening forming surface 21b. Has a surface facing the lid. That is, the wall surface portion 21c is a part of the peripheral surface surrounding the recess 21a which is a recess provided in the tip member 20.

The wall surface portion 21c of the present embodiment is arranged so as to surround the lid member 23 at a predetermined distance from the side surface 23d. In the present embodiment, the wall surface portion 21c is a side wall surface of a recess formed on the surface of the base portion 21 and the lid member 23 is fitted inward, and the opening forming surface 21b corresponds to the bottom surface of the recess.

Further, as shown in FIG. 12, of the wall surface portion 21c, the wall surface (hereinafter referred to as the tip side wall surface) 21ca formed on the tip direction A side is formed with a recess 21c1d into which the protrusion 30A is fitted. That is, the wall surface portion 21c has a tip side wall surface 21ca. The tip side wall surface 21ca is provided on the tip member 20 and is formed along a direction intersecting the longitudinal axis 2a of the insertion portion 2. The surface on which the recess 21c1d is formed is a part of the peripheral edge surrounding the first recess 21a. The first recess 21a is a recess provided in the tip member 20.

Next, the lid member 23 will be described. FIG. 13 is a perspective view seen from the outer surface 23f side on the opposite side of the contact surface 23b of the lid member 23. FIG. 14 is a perspective view of the lid member 23 as viewed from the contact surface 23b side. FIG. 15 is a cross-sectional view showing a state in which a part of the protrusion 30A of the lid member 23 has entered the recess 21c1d.

In the present embodiment, as an example, the lid member 23 has a substantially rectangular shape, and as shown in FIG. 9, has a cut shape portion 23x in which a part is cut off. The first recess 21a of the base portion 21 has a shape corresponding to the shape of the cut shape portion 23x of the lid member 23. Therefore, in the base portion 21, the shape portion corresponding to the cut shape portion 23x becomes thick, so that the rigidity of the second arm portion 20c is increased.

The side surface 23d of the lid member 23 includes a pair of surfaces substantially parallel to the longitudinal axis 2a and a pair of surfaces substantially orthogonal to the longitudinal axis. The side surface 23d is a part of the peripheral surface of the lid member 23. The side surface 23d faces the wall surface 21c when the lid member 23 covers a part of the tip member 20.

Specifically, as shown in FIGS. 13 and 14, the lid member 23 has a protrusion 30A and another protrusion 30B. When the lid member 23 is attached to the base portion 21, the protrusions 30A and the other protrusions 30B project from a part of the side surface 23d of the lid member 23 toward the wall surface portion 21c. In particular, the protrusion 30A projects toward the tip side wall surface 21ca in the tip direction A when the lid member 23 is mounted on the base portion 21, and the other protrusions 30B are mounted on the base portion 21 by the lid member 23. When it is done, it protrudes toward the base end direction B. That is, when the protrusion 30A is provided on the tip member 20, the other protrusion 30B is provided on the surface of the lid member 23 opposite to the side surface on which the protrusion 30A is provided.

The protrusion 30A is formed so that it can be inserted into the recess 21c1d formed in the wall surface 21c1. As shown in FIG. 13, the protrusion 30A has a first protrusion 30A1 protruding from the side surface of the lid member 23, and a second protrusion 30A2 having a smaller protrusion amount than the first protrusion 30A1. The length L1 along the side surface 23d direction orthogonal to the longitudinal axis 2a of the first protrusion 30A1 is longer than the length L2 along the side surface 23d direction orthogonal to the longitudinal axis 2a of the second protrusion 30A2.

As shown in FIG. 15, the first projecting portion 30A1 includes a tip surface 30A1a in the projecting direction (tip direction A), an outer surface 30A1b on the outer surface 23f side, and an inner surface 30A1c on the opposite side to the outer surface 23f. Have. The recess 21c1d has an outer upper surface 21a1 of the tip member 20, a bottom surface 21a2 on the tip direction A side, and an inner lower surface 21a3 of the tip member 20.

As shown in FIG. 13, the above-mentioned length L1 of the first protrusion 30A1 is longer than the above-mentioned length L2 of the second protrusion 30A2, and the amount of protrusion of the first protrusion 30A1 from the side surface 23d is the side surface 23d. It is larger than the amount of protrusion of the second protrusion 30A2 from.

Further, the fixing resin 26 also enters between a part of the contact surface 23b of the lid member 23 and a part of the opening forming surface 21b of the tip member 20. Further, the fixing resin 26 also enters between the bottom surface 21a2 of the recess 21c1d and the front end surface 30A1a, and between the lower surface 21a3 and the inner side surface 30A1c of the recess 21c1d.

After inserting the protrusion 30A into the recess 21c1d, the operator assembling the tip portion 5 attaches the lid member 23 to the first recess 21a while the other protrusion 30B is in contact with the wall surface portion 21c on the base end direction B side. Fit inside. At this time, as shown in FIG. 15, the tip surface 30A2a of the second protrusion 30A2 abuts on the tip side wall surface 21ca on the tip direction A side, but the tip surface 30A1a of the first protrusion 30A1 is the first recess 21a. It is not pressed against the bottom surface 21a2 of. That is, the positioning of the lid member 23 in the tip direction A with respect to the first recess 21a is defined by the amount of protrusion of the second protruding portion 30A2 from the side surface 23d of the lid member 23.

Further, when the lid member 23 is fitted inside the first recess 21a, the first protrusion 30A1 is formed so that the outer surface 30A1b of the first protrusion 30A1 comes into contact with the upper surface 21a1 of the recess 21c1d. At this time, the inner side surface 30A1c of the first protrusion 30A1 is not in contact with the lower surface 21a3 of the first recess 21a. That is, the positioning of the lid member 23 in the outer direction of the tip member 20 and the adjustment of the surface positions of the outer surface of the tip member 20 and the outer surface 23f of the lid member 23 are performed on the outer surface 30A1b of the first protrusion 30A1 and the first recess. It is defined by the contact with the upper surface 21a1 which is the outer surface of the 21a.

As shown in FIGS. 6 and 12, the protrusions 30A and the other protrusions 30B have a wall thickness smaller than the wall thickness on the side surface 23d of the lid member 23. Therefore, as shown in FIG. 15, the protrusion 30A is separated from the contact surface 23b of the lid member 23 and the outer surface 23f on the side opposite to the contact surface 23b in the thickness direction. When the tip surface 30A2a of the second protrusion 30A2 comes into contact with the tip side wall surface 21ca on the tip direction A side, the side surface 23d in the portion where the protrusion 30A is provided is prevented from coming into close contact with the wall surface 21c, and the side surface 23d A gap 27 having a predetermined width is formed between the wall surface portion 21c and the wall surface portion 21c. That is, the second protruding portion 30A2 provided on the lid member 23 is a positioning protruding portion that maintains the distance between the side surface 23d of the lid member 23 and the wall surface portion 21c of the tip member 20.

Further, the other protrusion 30B has a cut surface 30Ba as shown in FIGS. 12 and 14. After the protrusion 30A is inserted into the recess 21c1d, the other protrusion 30B is brought into contact with the wall surface (hereinafter referred to as the base side wall surface) 21cc formed on the base end direction B side of the wall surface portion 21c while being brought into contact with each other. The cut surface 30Ba is inclined so that the cut surface 30Ba approaches the tip direction A from the surface opposite to the outer surface 23f toward the longitudinal axis 2a so that the cut surface 30Ba can be easily fitted inside the first recess 21a.

The tip side wall surface 21ca and the base end side wall surface 21cc provided on the base portion 21 are arranged so as to sandwich the lid member 23 from both directions along the longitudinal axis 2a. Therefore, in the present embodiment, the tip surface 30A2a of the second protrusion 30A2 comes into contact with the tip side wall surface 21ca, so that the lid member 23 is positioned in the longitudinal axis 2a direction with respect to the base portion 21.

As shown in FIG. 12, the clearance amount Lb in the longitudinal axis 2a direction when the lid member 23 is fitted inside the first recess 21a is substantially equal to the protrusion amount La of the first protrusion 30A1, but is cut. Since the surface 30Ba is provided, the lid member 23 can be fitted inside the first recess 21a.

Positioning of the lid member 23 with respect to the base portion 21 in the circumferential direction orthogonal to the longitudinal axis 2a is performed by bringing the contact surface 23b into contact with the opening forming surface 21b as described above. Therefore, in the present embodiment, when the lid member 23 is adhered to the base portion 21, the operator abuts the contact surface 23b on the opening forming surface 21b, inserts the protrusion 30A into the recess 21c1d, and then inserts the protrusion 30A into the recess 21c1d. The lid member 23 is fitted inside the first recess 21a while the protrusion 30B of the above is brought into contact with the base end side wall surface 21cc, so that the lid member 23 is positioned on the surface of the base portion 21 in the direction of the longitudinal axis 2a. Is done.

At this time, a groove-shaped gap 27 is formed between the lid member 23 and the wall surface portion 21c surrounding the lid member 23. The gap 27 generated around the lid member 23 is continuous along the outer circumference of the contact surface 23b of the lid member 23 without interruption.

Then, as shown in FIG. 6, the fixing resin 26 before curing is poured into the gap 27 formed between the lid member 23 and the wall surface portion 21c, and then the fixing resin 26 is cured to form a base. The lid member 23 is adhesively fixed to the base portion 21. Here, in the present embodiment, since the fixing resin 26 can be arranged without a gap along the outer circumference of the contact surface 23b of the lid member 23 without interruption, the lid member 23 can be fixed to the base portion 21. It can be done reliably and firmly. When the fixing resin 26 is poured into the gap 27, the upper surface 21a1 of the recess 21c1d and the outer surface 30A1b of the first protruding portion 30A1 are in contact with each other and are engaged with each other, so that the lid member 23 does not fall off from the base portion 21. Therefore, the workability of pouring the fixing resin 26 is good.

Further, in the present embodiment, as shown in FIGS. 7 and 11, a chamfered portion 23e having the corner cut out is formed at a part of the corner where the contact surface 23b and the side surface 23d of the lid member 23 intersect. ing. Further, a notch 21e is formed in the wall surface portion 21c facing the side surface 23d in which the chamfered portion 23e is formed. A tool can be inserted into the gap between the chamfered portion 23e and the opening forming surface 21b, for example, when the lid member 23 is removed from the base portion 21 during maintenance of the endoscope 100.

Next, the movable member 51 arranged in the accommodation space 22 will be described.

As shown in FIGS. 5, 6 and 10, the movable member 51 is supported by the base portion 21 so as to be movable with respect to the base portion 21 in the first recess 21a. Specifically, the base portion 21 is formed with a bearing 28 that penetrates from the bottom surface of the first recess 21a to the riser accommodating space 20d. The bearing 28 rotatably supports the shaft portion 51a fixed to the movable member 51. The movable member 51 includes a lever 51b extending from the shaft portion 51a in a direction orthogonal to the shaft portion 51a in the first recess 21a. Therefore, the lever 51b swings around the rotation shaft of the shaft portion 51a in the first recess 21a.

In this embodiment, the rotation axis of the movable member 51 is substantially parallel to the X axis. Therefore, the lever 51b moves in the first recess 21a (accommodation space 22) in a direction substantially along the longitudinal axis 2a.

The tip of the riser operating wire 18 is connected to the lever 51b at a position separated from the shaft portion 51a by a predetermined distance. The raising base operation wire 18 is inserted into a through hole 21d penetrating the base portion 21 and the base portion 20a from the side surface of the first recess 21a toward the base end direction B. In this embodiment, a guide pipe 29 for guiding the riser operating wire 18 is inserted in the through hole 21d. The guide pipe 29 is a rigid tubular member. The riser operating wire 18 is inserted into the guide pipe 29.

As described above, the riser operating wire 18 moves forward and backward in the direction along the longitudinal axis 2a in response to the swing of the riser operation lever 14. Therefore, the lever 51b swings around the rotation axis in response to the swing of the riser operating lever 14.

The shaft portion 51a extends into the riser accommodating space 20d, and the riser 50 is fixed to the portion extending into the riser accommodating space 20d of the shaft portion 51a. Therefore, as shown in FIG. 8, the raising table 50 swings around the rotation axis of the shaft portion 51a together with the movable member 51. That is, the riser 50 swings around the rotation axis in response to the swing of the riser operating lever 14.

The raising table 50 is a tongue-shaped member extending in one direction from the shaft portion 51a. A treatment tool channel tube 17 is opened on the base end direction B side of the riser stand 50 in the riser stand accommodation space 20d. As the raising table 50 swings, the angle of the treatment tool protruding from the treatment tool channel tube 17 changes.

A part of the lever 51b of the movable member 51 protrudes from the opening forming surface 21b from the opening of the first recess 21a. That is, a part of the movable member 51 projects into the second recess 23a formed in the lid member 23.

That is, in the present embodiment, the movable member 51 that moves in the accommodation space 22 is arranged so as to move substantially parallel to the mating surface of the base portion 21 and the lid member 23, and a part of the movable member 51 is arranged. The first recess 21a projects beyond the opening forming surface 21b (contact surface 23b), which is the mating surface of the base portion 21 and the lid member 23, into the second recess 23a. Therefore, when viewed from a direction parallel to the mating surface of the base portion 21 and the lid member 23 (for example, when viewed from the line-of-sight direction of FIG. 6), the movable member 51 is the mating surface of the base portion 21 and the lid member 23. It overlaps with.

Next, a configuration for determining the moving range of the movable member 51 in the accommodation space 22 will be described.

At least one of both ends of the moving range of the movable member 51 in the accommodating space 22 is determined by the position where the movable member 51 abuts on the regulating portion 22a which is a part of the side wall of the accommodating space 22.

Specifically, in the present embodiment, the end of the moving range of the movable member 51 on the tip direction A side is a position where the movable member 51 abuts on the regulating portion 22a provided on a part of the side wall of the first recess 21a. Is. 6 and 10 show a state in which the movable member 51 is located at the end of the moving range on the tip direction A side and is in contact with the regulating portion 22a.

As described above, when viewed from a direction parallel to the mating surface of the base portion 21 and the lid member 23, the movable member 51 is in a state of overlapping the mating surface of the base portion 21 and the lid member 23, and the accommodation space 22 Move inside. Therefore, the restricting portion 22a provided on the side wall of the first recess 21a abuts on the movable member 51 moving toward the tip direction A in the accommodation space 22 before the side wall of the second recess 23a. , It protrudes from the side wall of the second recess 23a toward the base end direction B side.

That is, the opening width of the second recess 23a in the longitudinal axis 2a direction is wider than the opening width of the first recess 21a, and the side wall of the second recess 23a is the longitudinal axis from the movable member 51 in a state of being in contact with the regulating portion 22a. It is separated in the 2a direction.

As in the present embodiment, the bearing 28 that supports the movable member 51 and the regulating portion 22a that defines the moving range of the movable member 51 are provided on the base portion 21 that is the same member, so that the accuracy of the moving range of the movable member 51 is accurate. Can be improved. The regulating portion 22a may be provided on the lid member 23 (side wall of the second recess 23a).

On the other hand, the end of the movable member 51 on the base end direction B side is a position where the riser 50 fixed to the movable member 51 comes into contact with the stopper 20k protruding into the riser accommodation space 20d. The stopper 20k is shown in FIGS. 5 and 8. FIG. 8 shows a state in which the riser 50 is in contact with the stopper 20k. By providing the stopper 20k that directly contacts the riser 50 in the riser accommodation space 20d, the riser 50 can be positioned regardless of the variation in the fixed positions of the movable member 51 and the riser 50.

As described above, the endoscope 100 of the present embodiment has a storage space 22 for accommodating the movable member 51 in the insertion portion 2 inserted into the subject. The accommodation space 22 is formed by a first recess 21a formed in the base portion 21 provided in the insertion portion 2 and a second recess 23a formed in the lid member 23 adhesively fixed to the base portion 21. It is configured.

In the present embodiment, the lid member 23 is provided with a protrusion 30A and another protrusion 30B that protrude from the side surface 23d and are thinner than the wall thickness of the side surface 23d. A part of the protrusion 30A enters the recess 21c1d of the wall surface portion 21c provided on the base portion 21, and the tip surface 30A1a of the second protrusion 30A2 abuts on the tip side wall surface 21ca in the direction of the longitudinal axis 2a. In addition to positioning the lid member 23 with respect to the base portion 21, a groove-shaped gap 27 having a predetermined width for pouring the fixing resin 26 into the side surface portion 23d and the wall surface portion 21c is formed.

The front end surface 30A2a of the second protrusion 30A2 is not in contact with the tip side wall surface 21ca, and the tip surface 30A1a of the first protrusion 30A1 is brought into contact with the bottom surface 21a2 of the recess 21c1d. The lid member 23 may be positioned with respect to the base portion 21 in the direction.

Since the protrusion 30A and the other protrusion 30B only protrude from a part of the side surface 23d and are thinner than the side surface 23d, the groove-shaped gap 27 is continuous along the side surface 23d without interruption. It is extended. Therefore, in the present embodiment, the fixing resin 26 before curing can be spread over the entire side surface 23d which is the outer circumference of the lid member 23.

Therefore, in the endoscope 100 of the present embodiment, at the time of assembly, the operator inserts a part of the protrusion 30A into the recess 21c1d of the tip side wall surface 21ca, and then inserts another protrusion 30B along the base end side wall surface 21cc. The lid member 23 is inserted into the first recess 21a while being brought into contact with the lid member 23. After that, by curing the fixing resin 26 that has been poured into the gap 27, the lid member 23 can be firmly fixed while accurately positioning the lid member 23 with respect to the base portion 21. In the present embodiment, the tip member 20 and the lid member 23 are made of a metal such as stainless steel, but the tip portion 20 and the lid member 23 may be made of a hard resin such as plastic. The tip portion 20 and the lid member 23 may be bonded with the fixing resin 26 in the same manner as in the above-described embodiment, and instead of using the fixing resin, between the tip portion 20 and the lid member 23, For example, the groove-shaped gap 27 may be welded by using an ultrasonic welding technique or the like.

As described above, according to the endoscope 100 of the present embodiment, it is possible to provide an endoscope having improved workability when fixing the lid member to the hard member arranged at the tip of the insertion portion. it can.

Next, a modified example of the above-described embodiment will be described.
(Modification example 1)
In the above-described embodiment, the lid member 23 is provided with the protrusion 30A, and the concave portion 21c1d is formed on the wall surface portion 21c of the first concave portion 21a of the tip member 20, but the lid member 23 is provided with the concave portion on the wall surface portion 21c. A protrusion may be provided.

FIG. 16 is a cross-sectional view of the tip portion according to the present modification 1. The tip side wall surface 21ca of the tip member 20 is provided with a protrusion 30C corresponding to the protrusion 30A in the above-described embodiment. The protrusion 30C has the same shape as the protrusion 30A described above. That is, the protrusion 30C has a first protrusion 30C1 and a second protrusion 30C2 having a smaller protrusion amount than the first protrusion 30C1. The first protruding portion 30C1 and the second protruding portion 30C2 have the same shape as the first protruding portion 30A1 and the second protruding portion 30A2 described above, respectively.

A first recess 23g is formed on the side surface 23d of the lid member 23. The first recess 23g has the same shape as the recess 21a described above, and the protrusion 30C fits into the first recess 23g. The protrusion 30C projects toward the side surface 23d of the lid member 23. In FIG. 16, the inner side surface (the surface formed on the side opposite to the outside of the tip member 20) 30C1a of the first protrusion 30C1 is formed on the lower surface (the side opposite to the outside of the tip member 20) of the first recess 23g. Surface) Although it is in contact with 23ga, the tip surface 30C1b of the first protrusion 30C1 and the bottom surface 23gb of the first recess 23g are not in contact, and the outer surface 30C1c of the first protrusion 30C1 and the upper surface of the first recess 23g are in contact. No 23 gc is in contact.

The inner side surface 30C1a of the first protrusion 30C1 abuts on the lower surface 23ga of the first recess 23g, so that the lid member 23 is positioned in the direction of the outer surface 23f. Therefore, the tip surface 30C2a of the second protruding portion 30C2 comes into contact with the tip side wall surface 21ca, so that the lid member 23 is positioned in the longitudinal axis 2a direction.

The present modification 1 also produces the same effect as that of the above-described embodiment.
(Modification 2)
In the above-described embodiment, the lid member 23 has another protrusion 30B, and the other protrusion 30B is in contact with the base end side wall surface 21cc. However, the wall surface portion 21c is provided with a slope forming portion, and the lid member 23 is provided. It does not have to have a protrusion.

FIG. 17 is a cross-sectional view showing a contact state between the base end side wall surface 21 kb of the tip member 20 and the lid member 23 according to the present modification 2. As shown in FIG. 17, a slope forming portion 21ccbx is formed on the opening edge portion of the base end side wall surface 21cc of the tip member 20. The slope forming portion 21cbx is formed of an inclined surface of the opening forming surface 21b that is inclined toward the base end side along the insertion axis.

Therefore, in the second modification, after the protrusion 30A is inserted into the recess 21c1d, the lower end edge 23i of the lid member 23 moves while abutting along the inclined surface 21cbx1 of the slope forming portion 21cbx, and the lid member 23 moves along the inclined surface 21cbx1. It is fitted inside the recess 21a.

The second modification also produces the same effect as that of the above-described embodiment.
(Modification example 3)
In the above-described embodiment, the protrusion 30A is provided so as to be separated from the contact surface 23b and the outer surface 23f of the lid member 23 in the thickness direction, but may not be separated from the contact surface 23b.

FIG. 18 is a cross-sectional view showing a state in which a part of the protrusion 30D according to the third modification, which corresponds to the protrusion 30A in the above-described embodiment, is inserted into the recess 21c1d.

As shown in FIG. 18, the protrusion 30D of the lid member 23 has a first protrusion 30D1 and a second protrusion 30D2. The first protruding portion 30D1 and the second protruding portion 30D2 have the same shapes as the first protruding portion 30A1 and the second protruding portion 30A2 described above, respectively, but the lower surface (opening forming surface) of the first protruding portion 30D1. A cut surface 30D1a is formed on the surface on the 21b side).

A recess 21c2d is formed on the tip side wall surface 21ca of the tip member 20. The recess 21c2d is formed on the tip side wall surface 21ca so that the lower surface 21c2d1 of the recess 21c2d is flush with the opening forming surface 21b. The recess 21c2d has the same shape as the recess 21c1d described above.

Further, the positioning of the lid member 23 in the direction of the longitudinal axis 2a is performed by the tip surface 30D1b of the first protruding portion 30D1 coming into contact with the bottom surface 21c2d2 of the recess 21c2d.

The tip surface 30D1b of the first protruding portion 30D1 is not brought into contact with the bottom surface 21c2d2 of the recess 21c2d, but the tip surface 30D2a of the second protruding portion 30D2 is brought into contact with the tip side wall surface 21ca to cover the lid in the longitudinal axis 2a direction. The member 23 may be positioned. FIG. 19 is a cross-sectional view showing a case where the tip surface 30D2a of the second protrusion 30D2 abuts on the tip side wall surface 21ca. In the case of FIG. 19, since the height of the recess 21c2d in the direction orthogonal to the longitudinal axis 2a direction is large, the cut surface is not formed on the lower surface of the first protrusion 30D1, but as in FIG. 18, the first A cut surface may be provided on the lower surface of the protruding portion 30D1.

The present modification 3 also produces the same effect as that of the above-described embodiment.
(Modification example 4)
In the above-described modification 1, the protrusion 30C has two protrusions, a first protrusion 30C1 and a second protrusion 30C2, but the protrusion 30C does not have to have the two protrusions.

FIG. 20 is a cross-sectional view showing a state in which the protrusion 30E according to the present modification 4, which corresponds to the protrusion 30A in the above-described embodiment, has entered the recess 23g. As shown in FIG. 20, the protrusion 30E does not have two protrusions. Further, a cut surface 23d3 is formed below the side surface 23d of the lid member 23.

When the protrusion 30E enters the first recess 23g provided in the lid member 23, the tip surface 30Ea of the protrusion 30E comes into contact with the bottom surface 23d1 of the first recess 23g, so that the lid member 23 in the longitudinal axis 2a direction Positioning can be performed. When the protrusion 30E enters the first recess 23g provided in the lid member 23, the tip side wall surface 21ca comes into contact with the lower portion of the side surface 23d of the lid member 23, so that the lid in the longitudinal axis 2a direction is formed. The member 23 may be positioned.

Although the lid member 23 is provided with a cut surface 23d3 in FIG. 20, the lid member 23 does not have to have such a cut surface.

FIG. 21 is a cross-sectional view showing a state in which the protrusion 30E has entered the recess 23g1 when the lid member 23 does not have a cut surface, which is related to the present modification 4. As shown in FIG. 21, since the opening of the recess 23g1 provided in the lid member 23 is wide, the protrusion 30E can be easily inserted into the recess 23g1.

The present modification 4 also produces the same effect as that of the above-described embodiment.

As described above, according to the above-described embodiment and each modification, it is possible to provide an endoscope having improved workability when fixing the lid member to the hard member arranged at the tip of the insertion portion.

The present invention is not limited to the above-described embodiment, and various modifications, modifications, and the like can be made without changing the gist of the present invention.

Claims

A hard member placed at the tip of the insertion part of the endoscope,
A lid member that covers a part of the hard member and
A first wall surface provided on the hard member and having a plane along a direction intersecting the longitudinal axis of the insertion portion, and
A second wall surface provided on the lid member and facing the first wall surface when the lid member covers a part of the hard member, and
A protrusion provided on one of the first wall surface and the second wall surface and projecting toward the other,
A recess provided on the other side of the first wall surface and the second wall surface into which the protrusion is fitted,
An endoscope characterized by being equipped with.
The endoscope according to claim 1, wherein the first wall surface is a part of a peripheral surface surrounding a recess provided in the hard member.
The endoscope according to claim 2, wherein at least a part of the wall surface of the peripheral surface facing the first wall surface has an inclined surface extending toward the outside of the recess.
The endoscope according to claim 2, wherein the first wall surface and the second wall surface are surfaces formed on the distal end side or the proximal end side of the longitudinal axis.
The claim that when the protrusion is provided on the lid member, the surface formed on the outside of the hard member in the protrusion and the surface formed on the outside of the hard member in the recess are in contact with each other. The endoscope according to 1.
The endoscope according to claim 1, wherein a positioning protrusion for maintaining a distance between the first wall surface and the second wall surface is provided on one of the first wall surface and the second wall surface.
The endoscope according to claim 1, wherein the second wall surface is a part of a peripheral surface of the lid member formed in a substantially flat plate shape.
The endoscope according to claim 7, wherein at least a part of a wall surface facing the second wall surface on the peripheral surface of the lid member has an inclined surface that spreads toward the hard member side.
The endoscope according to claim 7, wherein the second wall surface is a surface formed on the distal end side or the proximal end side of the longitudinal axis of the lid member.
When the protrusion is provided on the hard member, the surface of the protrusion formed on the side opposite to the outside of the hard member and the surface of the recess formed on the side opposite to the outside of the hard member are in contact with each other. The endoscope according to claim 1, which is formed so as to be in contact with the endoscope.
The endoscope according to claim 1, wherein when the protrusion is provided on the hard member, the lid member has another protrusion provided on a surface opposite to the side surface on which the protrusion is provided.
The endoscope according to claim 11, wherein the end surface of the other protrusion is formed by an inclined surface extending toward the hard member side.