JPH1132981A - Endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a fluid from flowing into a hole part to which another incorporated matter is fitted by providing a large diameter part on the rear one side of a second hole part of a tip constituting member, providing a notched part for communicating both of the hole parts at a thin-thickness wall part between the second hole part and a first hole part and providing an adhesive layer at the boundary between the notched part and a pipe body fitted to the first hole part. SOLUTION: At the thin-thickness wall part 27 between the first hole part 19 and the large diameter part 25 of the second hole part 20 on the rear tip side of the tip constituting member 18, the notch part 28 communicating between the first and second hole parts 19 and 20 is formed and the part 27 between the first hole part 19 and the large diameter part 25 of the second hole part 20 is removed. Then, an adhesive 29 is applied in the state of a layer between a channel pipe 23 and the part 19 of the member 18 and along a mountain ridge on a boundary between with a notch part 23 to form the adhesive layer 31 preventing the flowing out of the fluid from a gap between the pipe 23 and the part 19. Thereby, the fluid passing through a fluid pipeline is surely prevented from flowing into hole parts 20 to 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an endoscope having a fluid channel at an insertion portion inserted into a lumen.

[0002]

2. Description of the Related Art Generally, in a video endoscope or a fiber type endoscope, for example, a shaft of an insertion portion is attached to a distal end constituting member forming an end portion of an elongated insertion portion inserted into a lumen such as a body cavity of a human body. A plurality of holes extending in the direction are formed. Here, at least one of the first holes is internally fitted with a pipe functioning as a fluid conduit, and a fluid conduit for ejecting fluid forward from the distal end of the insertion portion is formed. Have been. Further, in the second hole, which is a hole other than the first hole, at least any other built-in component such as an observation lens, an illumination lens, or another fluid conduit is provided.
The first hole formed in the tip component and the second hole are separated by a thin wall of the tip component itself.

[0003]

By the way, in an endoscope having a fluid conduit at an insertion portion inserted into a lumen,
In general, the distal end of a tube for forming a fluid conduit is inserted into a hole formed in a distal end member of the endoscope insertion portion. Therefore, the inner diameter of the hole formed in the distal end component for fitting the pipe for the fluid conduit configuration is slightly larger than the outer diameter of the pipe for the fluid conduit configuration. Therefore, there is a gap between the pipe for forming the fluid conduit and the hole of the tip component.

[0004] Therefore, an adhesive is filled in the gap between the fluid pipe-forming tube and the hole of the tip component on the distal end side of the fluid pipe-forming pipe, so that the fluid pipe-forming pipe is formed. The fluid which has passed through the inside of the endoscope is prevented from entering the inside of the endoscope from a gap between the tube for forming the fluid conduit and the hole of the distal end member.

[0005] However, in the endoscope of the above-mentioned conventional configuration, an adhesive filling agent is provided between the fluid conduit forming tube and the hole of the distal end member on the distal end side of the fluid conduit forming tube. And it is generally necessary to make this gap larger than the gap between the pipe for forming the fluid conduit and the inner peripheral surface of the hole for fitting the pipe inside. There is a problem that the outer diameter of the distal end portion of the insertion portion becomes large.

Furthermore, it is difficult to confirm that the gap between the pipe for forming the fluid conduit and the hole of the tip component is filled with the adhesive over the entire circumference, so that the bonding operation becomes uncertain. There is a risk. Therefore, a bonding operation is performed to fill a gap between the rear end side of the pipe for forming the fluid conduit and the hole of the distal end component, and the front end side of the pipe for forming the fluid conduit is used for forming the fluid conduit. The fluid that has entered the gap between the tubular body and the hole of the distal end component member is prevented from entering the inside of the endoscope.

Also in this case, since it is necessary to separate the hole of the distal end member into which the pipe for forming the fluid conduit is inserted and the hole into which other internal components are inserted, it is usually necessary to separate the hole. The internal fitting holes of each built-in component are isolated by a thin portion formed by the material of the tip component itself.

However, if the separated internal components are brought too close to each other, the thickness of the material of the distal end component itself interposed between the internal components becomes thin, so that the material is disposed between the internal components. The thinner part is easily damaged. As a result, the internal components cannot be reliably separated from each other, so that the interval between the multiple internal components cannot be extremely close, and the outer diameter of the distal end portion of the endoscope insertion portion becomes large. is there.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances. It is an object of the present invention to allow a fluid that has passed through a fluid conduit in an insertion portion to have a built-in component other than a fluid conduit tube. It is an object of the present invention to provide an endoscope which can reliably prevent inflow into a hole to be formed, arrange each built-in component close to each other, and reduce the outer diameter of the distal end portion.

[0010]

According to the present invention, a plurality of holes extending in the axial direction of the insertion portion are formed in a tip constituting member forming a tip portion of the insertion portion, and at least one of the holes is provided. A fluid conduit for ejecting a fluid forward from the distal end of the insertion portion is formed in the first hole, and at least observation is made in at least one of the second holes other than the first hole. In the endoscope in which any one of the lens for illumination, the lens for illumination, and another fluid conduit is formed, the diameter of the hole is larger at the rear end of the second hole of the tip component than at the tip. A large-diameter portion having a reduced diameter is provided, and the first hole portion and the first hole portion are formed in a thin wall portion between the first hole portion and the large-diameter portion of the second hole portion in the distal end component member. A notch for communicating with the second hole is provided, and the notch is fitted in the first hole. An endoscope, characterized in that a bonding layer along the boundary between the tube body tube road and the notch.

The first hole and the second hole are formed in a thin wall portion between the first hole and the large-diameter portion on the rear end side of the second hole in the distal end member. Is provided along the boundary between the cut-off portion and the pipe for the fluid conduit fitted in the first hole, thereby providing a fluid. Therefore, it is possible to make the distal end portion of the endoscope insertion portion thin without damaging other built-in components.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 1 and 2 (A) to 2 (D). FIG. 1 shows a schematic configuration of an entire system of a video endoscope 1 according to the present embodiment. Here, the endoscope 1 is provided with a soft elongated insertion portion 2 inserted into a body cavity.
The proximal end of the insertion section 2 is provided with an operation section 3 on the hand side which is held by the examiner.

The insertion section 2 has an elongated flexible tube section 4 having a base end connected to the operation section 3 and, for example, vertically and horizontally arranged at the distal end of the flexible tube section 4. A bending portion 5 that can be bent and a distal end portion 6 connected to the distal end of the bending portion 5 are provided.

The operating section 3 is provided with a treatment instrument introduction port 7 for introducing forceps and the like, and also includes an up / down bending operation knob and a left / right bending operation knob (not shown) for controlling the operation of the bending section 5; An air supply / liquid supply button for controlling the liquid supply function, a suction button for controlling the suction function, and a switch for remotely controlling the image recording function, the light amount, and the like are provided.

Further, a base end of a flexible universal cord 8 is connected to a side surface of the operation section 3. A first connector 9 is provided at the tip of the universal cord 8.
Are connected. The first connector 9 is connected to the light source device 1
0 is detachably connected.

Further, one end of a signal cable 11 is connected to the first connector 9. This signal cable 11
Is connected via a second connector 12 to a video processor 13 which is a signal processing device. further,
The video processor 13 has a monitor 1 for displaying a video signal.
4, a VTR deck 15 for recording video, a video printer 16, and a video disk 17 are connected to each other. The image observed by the endoscope 1 is
After being converted into an electric signal by a solid-state image sensor or the like (not shown) provided in the leading end configuration unit 6, an output signal from the solid-state image sensor is sent to a video processor 13 as a signal processing device via a signal cable 11. It has become. Further, the signals processed by the video processor 13 are transmitted to the monitor 14, the VTR deck 15, the video printer 1
6, and sent to the video disk 17, respectively. Then, an image of the image observed by the endoscope 1 is displayed on the monitor 14, and the image is recorded on the VTR deck 15 and the video disk 17 as necessary.
Further, the video is printed out by the video printer 16.

Further, the distal end portion 6 of the present embodiment is provided with a hard distal end member 18 as shown in FIG. FIG. 2A shows a rear end surface of the front end component 18 of the present embodiment. A plurality of, in this embodiment, four holes (first to fourth holes) 19 to 22 extending in the axial direction of the insertion portion 2 are formed in the distal end member 18. Here, FIG.
As shown in (C), a fluid pipe which has a forceps insertion hole and a channel pipe (a pipe body for a fluid pipeline) 23 functioning as a fluid pipeline and which ejects fluid forward from the distal end of the insertion portion 2. A road is formed.

Further, an observation lens group 24 is fitted in the second hole 20 as shown in FIG. Further, a large diameter portion 25 having a larger diameter than the diameter of the distal end side is provided at the rear end side of the second hole portion 20 of the distal end member 18. In this case, the small-diameter portion 26 on the distal end side of the second hole 20 extends from the distal end surface of the distal end component 18 to a substantially central position in the axial direction of the distal end component 18 as shown in FIG. . Further, the central axis of the small diameter portion 26 of the second hole portion 20 and the central axis of the large diameter portion 25 are arranged coaxially. The large-diameter portion 25 of the second hole 20 does not necessarily have to be circular, and may have a different shape other than circular.

The thin wall 27 between the first hole 19 and the large diameter portion 25 of the second hole 20 in the distal end member 18 has the first hole 19 and the second hole 19. A notch 28 communicating with the hole 20 is formed. And
At the time of fixing the channel pipe 23 inserted in the first hole 19 to the distal end member 18, the channel pipe 2 fitted in the first hole 19 as shown in FIG.
Adhesive 29 is applied in a layer along the boundary between 3 and notch 28. Further, the gap 30 between the first hole 19 and the channel pipe 23 is closed with an adhesive 29 on the rear end side of the tip component 18. As a result, the first hole 19 of the channel pipe 23 and the tip component 18 is formed.
The adhesive 29 is applied in a layered manner on the boundary between the channel pipe 23 and the notch 28 and the channel pipe 23 and the first hole 19.
An adhesive layer 31 is formed to prevent the fluid from flowing out of the gap 30 between them.

A light guide for guiding illumination light is fitted in the third hole 21, and a fluid pipe for flowing a fluid for cleaning the tip surface of the observation lens group 24 is provided in the fourth hole 22. The road is inlaid.

Next, the operation of the above configuration will be described.
For example, as shown in FIG. 3, when the distance between the built-in components disposed in the distal end component 18 is reduced, the distal end of the insertion portion 2 is reduced in diameter. The portion of the thin wall portion 27 that is easily damaged is formed between the first hole portion 19 and the large diameter portion 25 of the second hole portion 18 at 18. In this case, even if the watertight means by the adhesive layer 31 is provided between the channel pipe 23 and the distal end member 18 at the rear end side of the distal end member 18, even if the thin wall portion 27 is broken, The fluid that has passed through the gap 30 between the channel pipe 23 and the first hole 19 from the distal end side of the component member 18 will enter the endoscope from the damaged portion.

On the other hand, in the present embodiment, the thin wall portion 27 between the first hole portion 19 and the large diameter portion 25 of the second hole portion 20 at the rear end side of the front end component member 18. The notch 28 for communicating between the first hole 19 and the second hole 20 is formed in the first hole 19 and the second hole 20.
The thin wall 27 between the large-diameter portion 25 and the large-diameter portion 25 can be removed. Then, the adhesive 29 is layered along the ridgeline on the boundary between the channel pipe 23 and the first hole 19 of the tip component member 18 and on the boundary between the channel pipe 23 and the notch 28. To form a bonding layer 31 for preventing fluid from flowing out of the gap 30 between the channel pipe 23 and the first hole 19, so that the tip constituting member 18 is formed.
Can be stopped at the portion of the adhesive layer 31 on the rear end side, and the fluid can be prevented from entering the inside of the endoscope.

Therefore, the above configuration has the following effects. That is, in the present embodiment, the first hole 19 is formed in the thin wall portion 27 between the first hole portion 19 and the large diameter portion 25 on the rear end side of the second hole portion 20 in the front end component member 18. Notch 2 for communicating between the portion 19 and the second hole 20
8 along the boundary between the notch 28 and the channel pipe 23 fitted inside the first hole 19.
1 is provided, it is possible to reliably prevent the fluid that has passed through the fluid conduit in the insertion portion 2 from flowing into the holes 20 to 22 into which the internal components other than the channel pipe 23 are fitted. it can. Therefore, the fluid does not enter the endoscope and damage other internal components.

Further, the first hole 19 and the second hole 20
Can be arranged close to each other, which is advantageous in reducing the outer diameter of the distal end component member 18, and the endoscope distal end portion can be reduced in diameter.

In this embodiment, an example is shown in which the present invention is applied to a video endoscope. However, the present invention is not limited to a video endoscope, but can also be applied to a fiber endoscope. It is.

FIGS. 4A to 4C show the second embodiment of the present invention.
1 shows an embodiment of the present invention. In the present embodiment, the configuration of the distal end component 6 of the endoscope 1 of the first embodiment is changed as follows.

That is, in the present embodiment, the distal end component 6
Is formed with a convex curved surface 31 as shown in FIG. The tip component 6 has a lens mounting hole 3.
2 and a cleaning nozzle mounting hole 33 are formed. An observation lens group 34 is mounted in the lens mounting hole 32, and a cleaning nozzle 35 for cleaning the distal end surface of the observation lens group 34 is mounted in the cleaning nozzle mounting hole 33.

Further, the cleaning nozzle 35 is formed by a tubular member 36 as shown in FIG. The tubular member 36 is made of a plastic material which is softened by heating and hardened at room temperature.

At the time of forming the cleaning nozzle 35, for example, a part of the tubular member 36 made of PTFE is heated and softened, and as shown in FIG. The ejection port 37 is formed by bending the member 36 to be substantially perpendicular to the central axis of the member 36. Further, while maintaining the bent shape of the jet port portion 37, it is cooled and returned to room temperature, so that the tip end of the tubular member 36 is bent at a substantially right angle from the central axis of the tubular member 36. Is maintained.

When the cleaning nozzle 35 having the bent jet port 37 at the tip is attached to the tip of the tip component 6 of the endoscope 1, the tip of the jet port 37 of the cleaning nozzle 35 is attached to the observation lens. The bending angle of the ejection port portion 37 is set to be substantially a right angle so as to face the distal end surface of the group 34.

Therefore, the above configuration has the following effects. That is, the PTFE tubular member 36
It is difficult for dirt to adhere to the inner peripheral surface. Therefore, there is an effect that the clogging of the cleaning nozzle 35 hardly occurs.

Further, the processing can be easily performed because the ejection port 37 of the cleaning nozzle 35 can be formed only by heating and bending a part of the tubular member 36. Furthermore, since the outer surface of the PTFE is smooth, the cleaning nozzle 35 is less likely to be caught on the body wall when the insertion section 2 is inserted.

Therefore, in the present embodiment, the insertability of the insertion portion 2 can be improved, and the jetting port portion 37 of the cleaning nozzle 35 is hardly clogged, so that the cleaning nozzle 35 which can be easily processed can be provided.

FIG. 5 shows a third embodiment of the present invention. In the present embodiment, the configuration of the distal end component 6 of the endoscope 1 of the first embodiment is changed as follows.

That is, in the present embodiment, the tip component 6
Is formed by a convex curved surface 41 as shown in FIG. An observation lens group 42 and a cleaning nozzle 43 for cleaning the front end surface of the observation lens group 42 are mounted on the convex curved surface 41 of the distal end component 6. Further, the ejection port 44 of the cleaning nozzle 43 is disposed on the convex curved surface 41 of the distal end component 6. Here, the central axis of the jet port 44 of the cleaning nozzle 43 is set so that the normal line of the convex curved surface 41 is parallel to the central axis of the jet port 44 of the cleaning nozzle 43. It is arranged at an angle to the axis.

Therefore, the above configuration has the following effects. That is, the ejection port 4 of the cleaning nozzle 43
4 has a central axis parallel to the normal direction of the convex curved surface 41 of the distal end component 6 of the endoscope 1, so that the ejection port 44 of the cleaning nozzle 43 is connected to the distal end component of the endoscope 1. 6 convex curved surface 41
The endoscope 1 has an effect of not impairing the insertability of the endoscope 1.

FIG. 6 shows a fourth embodiment of the present invention. In the present embodiment, the configuration of the distal end component 6 of the endoscope 1 of the first embodiment is changed as follows.

That is, in the present embodiment, the distal end component 6
Is made of a resin material. Further, the tip component 51 is provided with a plurality of storage holes 52 for storing a plurality of internal components. Each storage hole 52 is provided with a screw hole 53 extending from the inner wall of the storage hole 52 to the outer wall of the tip component member 51 in a direction perpendicular to the central axis direction of the storage hole 52.

A fixing screw 54 is screwed into the screw hole 53. Each of the internal components stored in each of the storage holes 52 is fixed to the distal end constituent member 51 by being pressed by a fixing screw 54 screwed into the screw hole 53. The diameter of the fixing screw 54 is D, the root diameter of the fixing screw 54 is d, the root diameter of the screw hole 53 is D ′,
When the peak diameter of No. 3 is d ', D>D' is set.

Next, the operation of the above configuration will be described.
In the present embodiment, when the fixing screw 54 is screwed into the screw hole 53, the screw hole 53 is plastically deformed or cut to fix the fixing screw 5
4 and the thread of the screw hole 53 are in contact with each other on the entire surface of the thread.
Therefore, the load is not locally concentrated on a thread having a part of the threaded portion between the screw hole 53 and the fixing screw 54, so that a part of the threaded portion between the screw hole 53 and the fixing screw 54 is not formed. The thread does not break and the screw does not stop functioning.

Also, since the amount of thread caught is large,
When the screw thread is worn by repeated attachment and detachment of the fixing screw 54, the screw groove is less likely to be damaged than the conventional screw hole 53. Further, there is an effect that the screw tightening torque can be managed when fixing the built-in component.

Therefore, the above configuration has the following effects. That is, in the present embodiment, in the distal end component member 51 formed of resin, the thread portion is hardly damaged, and the end component member 51 has good durability. further,
Since the tip component 51 can be formed of resin, the cost can be reduced. Further, even when d ′> d, the same operation and effect can be obtained.

It should be noted that the present invention is not limited to the above-described embodiment, and it goes without saying that various modifications can be made without departing from the spirit of the present invention. Next, other characteristic technical matters of the present application will be additionally described as follows.

(Additional Item 1) In an endoscope provided with at least one fluid conduit for ejecting a fluid forward from a distal end portion of the endoscope,
A step-shaped first hole having a plurality of diameters such that at least a part of a fluid conduit is internally fitted in the distal end member of the endoscope and has a larger diameter on the rear end side than on the distal end side; A thin wall portion between the first lens and the second hole into which any part of the illumination lens or the other fluid conduit is fitted, from the rear end side of the tip component to the second wall. A notch portion communicating the first hole portion and the second hole portion having a depth up to the maximum diameter portion of the first hole portion is provided, and is fitted in the first hole portion; An endoscope, wherein an adhesive layer is provided along a boundary between a fluid conduit and the notch.

(Prior Art in Additional Item 1) A hole provided at a tip portion in which a pipe functioning as a fluid conduit is housed and a hole in which other built-in components are housed are partitioned by a thin wall portion. I was

(Problem to be Solved by Supplementary Item 1) Generally, in an endoscope having a fluid conduit, the fluid conduit is fitted in a hole provided in a distal end member of the endoscope. Configuration. For this reason, the inner diameter of the hole provided in the distal end component for fitting the fluid conduit inward is slightly larger than the outer diameter of the fluid conduit, and the distance between the fluid conduit and the distal end constituent member is larger than that of the fluid conduit. Has a gap. Therefore, by filling the gap between the fluid conduit and the tip component with an adhesive on the distal end side of the fluid conduit, the fluid that has passed through the fluid conduit is interposed between the fluid conduit and the tip component. From entering the endoscope through the gap. However, in this method, a gap for filling the adhesive must be provided between the fluid pipe and the tip component on the distal end side of the fluid pipe, and this gap is generally formed between the fluid pipe and the fluid pipe. Since it is necessary to increase the gap between the inside diameter of the hole and the end of the endoscope, the adhesive may spread over the entire circumference of the gap between the fluid conduit and the tip component. It was difficult to confirm that it was filled, and the bonding operation was uncertain. For this reason, bonding is performed at the rear end side of the fluid conduit to fill the gap between the distal end component member and the fluid that has entered the gap between the fluid conduit and the distal end component member from the distal end side of the fluid conduit is inserted into the endoscope. To prevent infiltration. However, even in such a case, it is necessary that the hole for fitting in the fluid conduit and the hole for fitting in other built-in components are separated from each other. Usually, by the tip component,
Although the internal fitting holes are isolated, if the internal components are brought too close together, the thickness of the tip component between the internal components becomes thinner and it is easily damaged, and the individual internal components are securely connected. Because they could not be isolated, the internal components could not be brought close together. For this reason, the diameter of the end portion of the endoscope has become large.

The purpose of this supplementary item is to arrange each built-in object close to each other without allowing the fluid that has passed through the fluid conduit to flow into the hole where the other built-in object is fitted. An object of the present invention is to provide an endoscope having a small diameter.

(Means for Solving the Problem in Additional Item 1)
A notch is provided in a part of a thin wall portion that separates an inner fitting hole of a fluid conduit provided in a distal end portion main body of the endoscope and an inner fitting hole of another built-in component, By providing an adhesive layer between the fluid conduit and the cutout portion, the distal end portion of the endoscope can be made thin without damaging other internal components due to the fluid.

(Effect of Additional Item 1) Provided is an endoscope which is not observable due to a failure even if the scope is reduced in diameter. (Additional Item 2) The first hole is formed in the second
2. The endoscope according to claim 1, wherein the endoscope is isolated from the hole.

(Additional Item 3) The endoscope according to Additional Item 1, wherein the fluid conduit is formed of a pipe-shaped member such as metal or hard resin. (Additional Item 4) The endoscope according to Additional Item 1, wherein the fluid conduit is formed of a flexible tubular member.

(Additional Item 5) An endoscope having an observation lens and a cleaning nozzle made of fluororesin for cleaning the surface of the observation lens. (Prior art of Additional Item 5) Conventionally, a bent metal pipe has been used as a nozzle for cleaning an observation lens disposed at the distal end of an endoscope.

(Problem to be Solved by Supplementary Item 5) The metallic nozzle has a problem that dirt easily adheres to the inner surface of the pipe and is easily caught when inserted. The purpose of this supplementary item is to make it difficult for dirt to adhere to the inner surface,
An endoscope having a smooth outer surface and improved insertability.

(Means for Solving the Problem in Additional Item 5)
By heating and bending a part of the PTFE tube, it is possible to provide a nozzle that is less likely to be caught without any difficulty in processing, and to improve the insertability of the endoscope.

(Effect of Additional Item 5) Improvement of insertability. (Additional Item 6) By applying heat to a part of the fluororesin tube, a part of the tube is softened to form a softened part, and the tip of the tube is oriented substantially perpendicular to the axis of the tube. An endoscope having a cleaning nozzle formed by curing a softened portion after bending the softened portion.

(Additional Item 7) The endoscope according to additional items 5 and 6, wherein the fluororesin is PTFE. (Additional Item 8) Additional items 5 and 6 in which the fluororesin is PFA
Endoscope. (Appendix 9) The fluororesin is FEP.
Endoscope.

(Additional Item 10) The endoscope according to Additional Items 5 and 6, wherein the cleaning nozzle is formed of a flexible tube made of fluororesin. (Additional Item 11) In the endoscope in which the distal end portion is formed as a convex curved surface, when the cleaning nozzle is attached to the distal end portion of the endoscope, the opening of the cleaning nozzle is parallel to the endoscope insertion axis direction. The endoscope according to claim 5, wherein the direction is height and the vertical direction is width, and the opening is a modified circle having a height smaller than the width.

(Additional Item 12) The endoscope according to Additional Item 5, wherein the opening of the cleaning nozzle is elliptical. (Additional Item 13) The endoscope according to Additional Item 10, wherein the opening at the tip of the cleaning nozzle is bent at an obtuse angle with respect to the tube axis.

(Additional Item 14) The endoscope according to Additional Item 10, wherein the opening at the tip of the cleaning nozzle is bent at an acute angle to the tube axis. (Additional Item 15) In the endoscope in which the distal end portion is formed as a convex curved surface, the distal end portion of the cleaning nozzle is bent into a shape smoothly connected to the convex curved surface.
Endoscope.

(Additional Item 16) An endoscope in which a distal end portion is formed as a convex curved surface, wherein an endoscope having a cleaning nozzle whose axis is a normal line of a tangent plane of the convex curved surface is provided. . (Conventional technology of Supplementary Note 16) In an endoscope in which a distal end surface of a distal end portion is formed as a convex curved surface, a cleaning nozzle for an observation lens having an axis parallel to an endoscope insertion axis is provided with the convex curved surface. Had been arranged.

(Problem to be solved by Additional Item 16)
Since the nozzle is smoothly connected to the distal end surface of the endoscope, the endoscope can be easily inserted because the nozzle is not easily caught on the body wall when the endoscope is inserted.

(Means for Solving the Problem of Supplementary Item 16) Since the distal end surface of the endoscope can be smoothly connected to the nozzle, and the nozzle can be prevented from being caught on the body wall, the endoscope can be used. Can be improved.

(Effect of Additional Item 16) Improvement of insertability. (Additional item 17) A tip portion formed of resin, a tip end portion having a storage hole for storing at least one built-in component, a screw hole penetrating the storage hole, and a screw member for fixing the built-in component. In an endoscope apparatus, at least one of a screw root diameter and a screw root diameter of a screw hole is formed smaller than a screw root diameter and a screw root diameter of a screw member.

(Prior Art in Additional Item 17) Self-tapping screws have been used to fix the built-in components to the distal end body made of resin. (Problem to be solved by Additional Item 17) When fixing the built-in object to the tip end body made of resin, a screw is used. By tightening and opening, the screw ridges were damaged, and the internal components could not be fixed. Also,
In the case of using the self-tapping screw, the productivity was poor, and the tightening torque of the screw could not be controlled, so that the fixing of the built-in component was uncertain. An object of this supplementary item is to provide a durable and inexpensive endoscope in which a screw hole for fixing a built-in object to a distal end main body is hardly damaged.

(Means for Solving the Problem of Supplementary Item 17) In a screw hole for fixing a built-in object provided in a distal end body of an endoscope made of resin, a screw root diameter of a screw thread, At least one of the screw diameters is the screw diameter of the screw member,
By making the diameter smaller than the thread root diameter, the screw fixing resistance is increased, and the built-in component can be reliably fixed. (Effect of Additional Item 17) Provided is an endoscope that can securely fix a built-in component and has an inexpensive distal end component.

[0065]

According to the present invention, the first hole portion is formed in the thin wall portion between the first hole portion and the large-diameter portion on the rear end side of the second hole portion in the distal end component member. A notch portion communicating between the first hole portion and the second hole portion, and an adhesive layer is formed along a boundary between the notch portion and a pipe for a fluid conduit fitted in the first hole portion. Since it is provided, it is possible to reliably prevent the fluid that has passed through the fluid conduit in the insertion portion from flowing into the hole portion in which the other internal components other than the fluid conduit configuration tube are internally fitted, This is advantageous in arranging the built-in components close to each other and reducing the outer diameter of the distal end portion.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an entire system of an endoscope according to a first embodiment of the present invention.

FIGS. 2A and 2B show a configuration of a main part of the endoscope according to the first embodiment, wherein FIG. 2A is a cross-sectional view of a distal end component, and FIG. 2B is an ABCD of FIG. -E-F line sectional view, (C) is a GG line sectional view of (A), (D) is formed along a boundary between the pipe body and the cutout part fitted in the first hole. FIG. 2 is a perspective view showing the applied adhesive layer.

FIG. 3 is a longitudinal sectional view of a main part showing a partition wall between a first hole and a second hole of the distal end component.

FIG. 4 shows a second embodiment of the present invention.
(A) is a side view showing a cross section of a part of the tip component,
(B) is a longitudinal sectional view showing a molding material of the cleaning nozzle,
(C) is a perspective view showing a molding state of the cleaning nozzle.

FIG. 5 is a side view showing a configuration of a main part of a third embodiment of the present invention.

FIG. 6 is a longitudinal sectional view showing a configuration of a main part of a fourth embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 18 tip constituent member 19 first hole 20 second hole 23 channel pipe (tube for fluid conduit) 25 large diameter portion 27 thin wall portion 28 cutout portion 31 adhesive layer

Claims (1)

[Claims] A plurality of holes extending in the axial direction of the insertion portion are formed in a distal end component member constituting a distal end portion of the insertion portion, and a plurality of holes extending in the axial direction of the insertion portion are formed in at least one of the first holes. A fluid conduit for ejecting a fluid forward from the distal end of the insertion portion is formed, and at least an observation lens, an illumination lens, or a second hole that is at least one of the holes other than the first hole. In the endoscope in which any one of the other fluid conduits is formed, a large diameter portion having a larger diameter than the diameter of the distal end is provided at the rear end of the second hole of the distal end component. A thin wall portion between the first hole portion and the large diameter portion of the second hole portion of the tip component member, wherein the first hole portion and the second hole portion A cut-off portion for communicating between the fluid passages, and a tube for the fluid conduit fitted in the first hole portion; An endoscope comprising an adhesive layer provided along a boundary between the notch and the notch.