JPH0998940A - Endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cheap endoscope with a top part whose diameter is shorter. SOLUTION: The top part 2 of this endoscope has a light guide 5 fixed with a clasp 11 to form an illumination means. A slit part 11b is formed at the rear edge of the clasp 11 in the direction crossing orthogonally with the longitudinal direction of the clasp 11. The top side of a protection tube 13 which covers the light guide 5 is formed to be a covering tube fixing means 17 which is to fix the protection tube tied by a thread tightening 14 at the slit part 11b. Since the slit part 11b is formed on the side adjacent to the contents such as an image pickup device 7, the slit part 11b can be placed near the contents and the diameter of the top part 2 of the endoscope can be shorter.

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 fixing means for a tube covering a light guide such as a light guide composed of a fiber bundle.

[0002]

2. Description of the Related Art In recent years, endoscopes having an elongated insertion portion and provided with an illuminating means and an observing means at the distal end portion of the insertion portion are widely used in the medical and industrial fields. This illuminating means is generally formed by using a light guide (or a light guide fiber). The light guide is formed of a flexible fiber bundle, and the illumination light from an external light source device is transmitted to the end face on the tip side by the fiber bundle to illuminate the object side.

This fiber bundle is covered with a tube for covering the fiber to prevent breakage of the fiber. Also,
The fiber bundle is provided with a base for fixing to the tip,
The base is fixed to the tip and the tube covering the fiber bundle is fixed to the base.

As a conventional technique for fixing the tube, there is, for example, Japanese Utility Model Laid-Open No. 55-155205, in which a step portion (flange) is provided in a part of a tip pipe (straight pipe) of a light guide fiber. Japanese Patent Application Laid-Open No. 2004-242242 discloses a structure in which the end portion of the covering tube is hooked and thread-tied. With this configuration, the covering tube is hooked on the convex portion of the flange to be fixed thereto.

[0005]

In the above-mentioned prior art, since the step portion formed of the flange is provided on the mouthpiece of the light guide fiber, it is troublesome to process the step portion, and as a result, the cost of the member becomes expensive. Further, since the step portion is provided, the outermost diameter of the die becomes large at that portion, and as a result,
This is a drawback that the tip of the endoscope becomes thicker.

The present invention has been made in view of the above points, and it is an object of the present invention to provide an endoscope which solves the above-mentioned drawbacks and which can be realized at a low cost and in which the diameter of the distal end portion can be reduced.

[0007]

In an endoscope having a mouthpiece for fixing the tip of an optical guide member composed of a fiber bundle to the tip portion of the endoscope, a rear end side of the mouthpiece is orthogonal to the longitudinal direction of the mouthpiece. The coating tube fixing means for fastening and fixing the coating tube covering the light guide member by thread binding or the like is provided in the notch portion provided with the notch in the direction. With this configuration, the covering tube is fastened and fixed on the cutout portion, so that the diameter of the fastening and fixing portion can be reduced, and thus the diameter of the distal end portion of the endoscope can be reduced. In addition, a die having a notch can be manufactured easily and at low cost.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. (First Embodiment) FIGS. 1 to 4 relate to a first embodiment of the present invention. FIG. 1 is a detailed view of a distal end portion of an endoscope in the first embodiment, and FIG. 3 is a cross-sectional view showing the light guide cap portion according to the embodiment, FIG. 3 is a cross-sectional view taken along the line AA of the endoscope tip portion according to the present embodiment, and FIG. 4 is a perspective view of the base according to the present embodiment.

As shown in FIG. 1, the insertion portion 1 forming the endoscope has a hard tip portion 2 at its tip, and the tip portion 2 is provided with a hard tip frame 2a. This tip frame 2a is
A hole communicating with the air / water feeding channel 3 is formed, and the tip of the tube 3a forming the air / water feeding channel 3 is fixed to the rear end of this hole via a mouthpiece, and the nozzle 4 is attached to the tip of this hole. Is provided.

An illumination lens 5a is provided at the tip of a through hole which penetrates the tip frame 2a and forms an illumination window, and the light which is inserted through the insertion portion 1 is provided at the rear side adjacent to the illumination lens 5a. The guide member, specifically, the front end side of the light guide 5 is fixed via the light guide base 11, and the illumination light transmitted by the light guide 5 is emitted forward through the illumination lens 5a to illuminate an object such as an affected area. Illuminating means is provided.

The light guide 5 is flexible and is composed of a fiber bundle in which light guide fibers for transmitting light are bundled, and the fiber bundle is covered with flexible tubes 12 and 13 for preventing breakage and the like. Then, the insertion portion 1 is inserted.

The object illuminated by the illumination light has an image pickup device 7 having an objective lens system 6 fixed through a lens frame 6b to a through hole forming an observation window 6a provided adjacent to the illumination window. Is imaged by.

The image pickup device 7 has an objective lens system 6 on the front end side. The objective lens system 6 has a lens frame 6b fitted in a through hole of the front end frame 2a and fixed to the front end frame 2a with screws or the like. ing. The outer periphery of the front end frame 2 a near the front end and a part of the front end surface are covered with a front end cover 8. A bendable bending portion 9 is provided at the rear end of the tip portion 2.

A first bending piece 9a is provided on the outer periphery of the tip frame 2a.
Are fitted and fixed. A rear end of the first bending piece 9a is rotatably connected to a second bending piece 9b by a first joint shaft 10, and a rear end of the second bending piece 9b is a third (not shown) third. A large number of bending pieces are rotatably connected to each other such that they are rotatably connected to the second bending piece and a second intermediate joint shaft, and a bending portion 8 is formed. By doing so, the wire can be pushed and pulled to bend a large number of bending pieces.

The bending pieces 9a, 9b are covered with a highly flexible rubber tube 9c. As shown in FIG. 3, a tube 16a forming a treatment instrument channel 16 is provided in the insertion portion 1, and a treatment instrument is inserted into the treatment instrument channel 16 to perform a medical treatment or a treatment instrument. It is also used to perform suction when it is not inserted. Note that FIG. 1 is a BB cross section of FIG. 3.

As shown in FIG. 1, a light guide base 11 having a light guide 5 fixed and fixed to the tip frame 2a is fixed by a screw or the like. The rear end side of the light guide base 11 projects rearward from the rear end of the front end frame 2a, and the covering tube fixing means 17 fixes the protection tube 13 for protecting the light guide 5. The covering tube fixing means 17, which is a feature of this embodiment, will be described below.

As shown in FIG. 2, the tip end side of the light guide 5 is filled in a cylindrical light guide base (hereinafter, simply referred to as a base) 11. The outer peripheral surface of the light guide 5 is a flexible outer tube 1 as a first covering material.
2 is covered, and the tip of the outer tube 12 is fixed to the rear end 11a of the base 11.

Further, the outer tube 12 has a second outer periphery.
A flexible protection tube 13 as a covering material is covered. As shown in FIG. 4, the mouthpiece 11 is provided with a slit portion 11b as a notch portion cut out in an arc shape in a direction orthogonal to the central axis O of the mouthpiece 11, that is, the longitudinal direction of the mouthpiece 11, as shown in FIG. Has been. Then, as shown in FIG. 2, a covering tube fixing means 17 for fixing the protective tube 13 to the mouthpiece 11 is formed in the slit 11 part b with a thread tie 14 as a means for fastening and fixing the protective tube 13.

FIG. 3 shows a base 1 at the tip 2 of the endoscope.
It is sectional drawing in the position of the slit part 11b provided in FIG.
As shown in FIG. 3, in the distal end portion 2 of the insertion portion 1, a treatment instrument channel 16, an air / water feeding channel 3, and an imaging device 7 are provided.
And a light guide 5 is built in. Light guide 5
The protective tube 13 for covering is arranged adjacent to these channels 16 and the image pickup device 7 in the layout.
In the present embodiment, the slit portion 11b of the mouthpiece 11 is provided in the direction adjacent to the built-in object or on the side facing the built-in object, and the tip portion 2 is fixed by the thread binding 14 at the slit portion 11b. Has achieved a smaller diameter.

The hard length of the tip portion 2 is the first from the tip surface.
The length up to the joint shaft 10 at the rear end of the bending piece 9a, and when simply described as the front end portion 2, it means this hard long portion. Next, the operation and effect of this embodiment are as follows.

When the thread binding 14 is performed at the position of the slit portion 11b of the mouthpiece 11, the outer diameter of this portion is determined by the slit portion 11b.
As compared with the portion without the slit, the slit portion 11b also digs into the slit portion 11b, so that the outer diameter in this portion can be reduced. The light guide 5 can be arranged on the center side of the endoscope by performing the thread binding 14 at the slit portion 11b on the side adjacent to the built-in object (the channel 16 or the imaging device 7) or on the adjacent portion. It is possible (if the yarn binding is performed without providing the slit portion 11b, the layout becomes an interference). Due to the action of this configuration, the outer diameter of the distal end portion 2 of the endoscope can be reduced in layout.

Further, by performing the thread binding 14 on the slit portion 11b, the fixing strength of the protective tube 13 (tube disconnection resistance) can be increased. In other words, unless the slit portion 11b is provided, it is difficult to fix the protective tube 13 without coming out without removing the fixed portion by thread binding, and in this case, the fixed portion becomes long.
The length of the hard portion on the tip side of the light guide 5 becomes long.

On the other hand, as described above, the slit portion 11
When fixed with b, the distal end side of the protective tube 13 is bent and fixed in the slit portion 11b, so that even if the thread binding 14 is short, it can be securely fixed without coming off. Compared with the conventional fixing method using a flange, the formation of the slit portion 11b (by processing) of the die 11 is easier, and the die 11 provided with the slit portion 11b can be provided at a low cost.

Although the protective tube 13 for covering the light guide 5 is fixed by the slit portion 11b by the covering tube fixing means 17 in the first embodiment, the protective tube 13 is overlapped with the outer tube 12. Alternatively, the slit portion 11b may be fastened and fixed by thread binding.

(Second Embodiment) Next, a treatment instrument having good operability will be described. 5 and 6 relate to the second embodiment of the present invention, FIG. 5 shows the configuration of the distal end side of the endoscope insertion portion of the present embodiment, and FIG. 6 shows the state of the treatment instrument channel and the treatment instrument. FIG. As shown in FIG. 5, the insertion portion 2 of the endoscope
0 is a flexible tube portion 21 having flexibility, and the flexible tube portion 2
And a curved tube portion 22 connected to the tip of the curved tube portion 2.
2 and is connected to the tip of the hard tip 23 and is composed of a hard tip 23.

The outer circumference of the curved tube portion 22 is covered with an outer skin 22a such as a rubber tube. In the tip portion 23,
A hole 24 that opens to the outside is formed, and an objective lens system 25 is provided in a hole adjacent to this hole 24. Insertion part 2
An image guide 26 as a light guide member for transmitting an optical image and a channel tube 27a forming a channel 27 through which a treatment tool is inserted are provided in the 0.

The image guide 26 is formed of a flexible fiber bundle in which ultra-fine fibers for transmitting light are bundled, and the fiber bundles at both ends of the fiber bundle are relatively matched or correspond to each other. Therefore, it has a function of transmitting an optical image.

The tip of the image guide 26 has a base 2
6a is filled and fixed, the mouthpiece 26a is fitted into the tip rigid portion 23, and the tip surface of the image guide 26 is adjusted so that the objective lens system 25 forms an optical image. It is fixed to the portion 23.

The rear end of the mouthpiece 26a projects rearward from the rear end of the tip portion 23, and the rear end portion of the mouthpiece 26a is in the direction orthogonal to the longitudinal direction of the mouthpiece 26a, as in the first embodiment. A notch 26b such as a notched slit is formed on the notch 26b to cover the image guide 26, and the tip side of the protective tube 26c for preventing breakage of each fiber is fastened and fixed on the notch 26b with a thread tie 26d. A tube fixing means 18 is provided.

Further, a light guide (not shown in FIG. 5) is provided at the distal end portion 23, and transmits illumination light to be emitted from the distal end surface and illuminate a diseased portion or the like so that it can be observed by the objective lens system 25. . The tip side of the protective tube for covering the light guide is also fixed by the covering tube fixing means having the same structure as the covering tube fixing means 18, and when provided in the direction adjacent to the covering tube fixing means 18 of the image guide 26, By providing the cutout portions 26b in the adjacent direction or on the adjacent side, they can be arranged close to each other without interfering with each other, and the diameter of the tip portion 23 can be reduced.

In the bending tube portion 22, a large number of bending pieces 22b are rotatably connected to each other in the longitudinal direction of the insertion portion 20.
In addition, a bending wire 19 for performing a bending operation is inserted, the distal end of the bending wire 19 is fixed to the distal end portion 23, and the rear end of the bending wire 19 is connected to a bending operation mechanism of an operation unit (not shown). .

A treatment tool 28 can be inserted into the channel 27 as shown in FIG. This treatment tool 28
Is inserted into the channel 27, and a bending portion 28a is provided near the distal end of the treatment tool 28 and is bent in a U shape. As shown in FIG. 6, the bent portion 28a has a width A, and if the inner diameter of the channel 27 is φB,
It is set so that A ≧ φB.

The present embodiment has the following actions and effects. In this embodiment, for example, the large-diameter channel 27
When the treatment instrument 28 combined with the small-diameter channel is inserted into the above, the clearance C is eliminated, and the treatment instrument 28 is pressed against one of the inner walls of the channel. As a result, stable insertion and operation of the treatment tool can be performed without play. Further, also in this embodiment, since the covering tube fixing means 18 and the like are provided, the diameter of the tip portion 23 can be reduced.

FIG. 7 is an explanatory view of the state of the channel and the treatment tool according to the modification of the second embodiment. (The same components as those in FIG. 6 have the same numbers as in the second embodiment.)
A bent portion 28 a is provided near the distal end of the treatment tool 28. The tip of the treatment instrument 28 is provided with an inclination of an angle θ. At this time, θ is 0 ° <θ ≦ 30 °.

This modification has the following actions and effects. Similar to the second embodiment, the treatment instrument 28 can stably insert and operate the treatment instrument without play.

Further, since the distal end portion of the treatment instrument 28 is inclined, the position of the treatment instrument 28 can be arbitrarily changed by rotating the treatment instrument 28.

(Third Embodiment) Next, an endoscope provided with an image pickup device capable of shortening the hard length of the distal end portion will be described with reference to FIG. As shown in FIG. 8, the imaging device 30 is attached to the main body 42 forming the distal end portion 29 of the endoscope. The image pickup device 30 is attached to an objective lens frame 33 fitted and fixed in a hole of a main body 42, and an objective lens group 34 constituting an objective lens system and a CCD holder 32 at the rear end of the objective lens frame 33. It is composed of an image pickup unit attached through the CCD, and the CCD 31 is built in the image pickup unit.

The CCD 31 has the following structure. The chip 31b is connected to the package 31c (hereinafter referred to as PKG), and the cover glass 3 is provided in front of the chip 31b.
1a is provided. Cover glass 31a, chip 3
1b is fixed to the PKG 31c by a sealing resin 31f. An optical glass 34b is joined in front of the cover glass 31a in an optically centered state.

These are abutted and fixed to the CCD holder 32. The CCD holder 32 fitted to the lens frame 33 to which the objective lens group 34 is attached is fitted and joined in the lens frame fitting portion 32a in a focused state.

The CCD lead is composed of a lead 31d extending toward the chip surface and a lead 31e extending toward the rear end of the PKG. The circuit board 35 is connected to the lead 31d extending to the chip surface side in the land 35a portion so as to extend to the chip surface side. An IC 36 and an electronic component 37 are mounted on the circuit board 35, and these constitute a circuit that processes input / output signals of the CCD 31.

The circuit board 35 is arranged in a circuit board housing hole 32b provided in the CCD holder 32. On the other hand, each of the signal lines 38a forming the cable 38 is connected to the lead 31e extending to the rear end side of the PKG.

A metal shield member 39 is fitted and provided on the outer periphery of the CCD holder 32.
It extends to the rear. Further, an insulating coating tube 40 is provided on the outer periphery of the shield member 39, and an adhesive 41 is filled on the inner peripheral surface of the shield member 39.
The hard length of the imaging device 30 extends to the position of the rearmost end 40a of the covering tube 40.

A tip cover 43 is provided on the outer periphery of the main body 42 so as to be fitted thereto. The tip cover 43 is provided with an illumination lens 44 for a light guide, and a base 45a filled with a light guide 45 is fixed (to the main body 42) so as to penetrate the main body 42, and the rear end of the base 45a is It extends behind the body 42.

At the rear end side of the base 45a, a base 45a on the side facing the image pickup device 30 as an adjacent built-in member is cut out at least partially in a direction orthogonal to the longitudinal direction of the base 45a. Is formed with a cutout portion 45b such as a slit portion, and the tip end side of the protective tube 45c covering the light guide 45 is thread-bound with the cutout portion 45b.
A covering tube fixing means 49 for fastening and fixing by 5d is provided.

In the present embodiment, the notch portion 45b has a certain length in the longitudinal direction of the mouthpiece 45b so that it can be placed in close proximity without interfering with an internal component placed adjacently.

Further, a first bending piece 46a forming a bending portion 46 is fitted and fixed to the outer periphery of the main body 42.

In the image pickup device 30 having such a configuration, the CCD
Since the lead of 31 is extended to the chip surface side, the circuit board 35 is connected to the lead, and the circuit board 35 is extended to the tip side of the imaging device 30, the other lead 3 is provided at the rear end of the PKG.
Since the arrangement is such that only the cable 38 is connected to 1e, since the circuit board 35, which is a factor of the hard portion, does not extend to the rear of the PKG, the hard length can be shortened.

Since the rigid length is shortened, insertion of the endoscope in the body cavity or the like and bending operation can be facilitated, and pain to the subject can be reduced. Further, the diameter of the tip portion 29 can be reduced similarly to the first embodiment.

In the first to third embodiments, at least a light guide member having a function of transmitting light (specifically, a light guide for transmitting light or an image guide for transmitting an optical image) is covered. The present invention is not limited to the slit-shaped notch formed in the direction orthogonal to the longitudinal direction of the die for fixing the tip side of the tube, and may be formed in a square shape, a rectangular shape, a circular shape, an oval shape, or the like. good. Further, it is not limited to the one in which the notch is formed on the side of the other built-in object, and for example, by providing the notch on the radially outer side from the center of the tip and fastening at the notch, the outer periphery thereof is formed. Side member (eg, the first bending piece 46 in FIG. 8)
The interference with a) may be prevented, and in this case also, the diameter of the tip can be reduced.

Next, an endoscope in which damage to the mucous membrane is eliminated when suction is performed will be described. 9 is a perspective view showing the distal end side of the first embodiment of the endoscope having a means for eliminating damage to the mucous membrane, and FIG. 10 is a sectional view taken along line CC of FIG.

As shown in FIG. 9, an objective optical system 53, an illumination optical system 54, an objective system cleaning nozzle 55, and a channel 51 are arranged at the distal end portion 50 of the endoscope. As shown in FIG. 9, a plurality of slits 52 are provided in the opening of the channel 51. As shown in FIG. 10, each slit 52 has an arc shape 52a with smooth corners in order to make the air flow efficient.

The operation and effect of this endoscope are as follows. As shown in FIG. 10, at the time of suctioning the channel 51, the mucous membrane 56 suctions through the slit 52 even when the opening of the channel 51 is blocked, so that it is possible to prevent the mucous membrane 56 from being sucked and damaged.

Next, a second embodiment of an endoscope having means for eliminating damage to the mucous membrane will be described. 11 is a perspective view showing the distal end side of the endoscope of the present embodiment, and FIG.
Shows a DD cross section of FIG. 11. The same components as those in FIGS. 9 and 10 will be described with the same reference numerals.

An objective optical system 53 is attached to the tip portion 50 of the endoscope.
An illumination optical system 54, an objective system cleaning nozzle 55, and a channel 51 are arranged. In the opening of the channel 51, a plurality of protrusions 57 are provided as shown in FIG.

The operation and effect of this endoscope are as follows. At the time of suctioning the channel 51, the mucous membrane 56 covers the opening of the channel 51 as shown in FIG.
The mucous membrane 56 contacts 7 and the mucous membrane 56 and the endoscope tip portion 50
Since there is a gap between and, and suction is performed at that portion, it is possible to eliminate the risk of sucking and damaging the mucous membrane 56.

Next, an endoscope in which a guide groove is provided in the channel hole will be described. 13 is a front view of the tip of this endoscope, and FIG. 14 is a sectional view taken along line EE of FIG. As shown in FIG. 13, at the distal end portion 60 of the endoscope, an objective optical system 62,
A channel hole 67 communicating with the illumination optical system 63, the objective system cleaning nozzle 64, and the channel tube 61 (see FIG. 14) is arranged.

As shown in FIG. 14, a tip cover 65 is fitted and fixed to the tip portion of a hard body 66 at the tip portion 60. Further, the objective lens 62b is attached to the objective lens frame 62a.
Is arranged such that the objective lens frame 62a penetrates the tip cover 65 and the main body 66. An image guide 62c is provided behind the objective lens 62b.

On the other hand, the channel tube 61 is connected to the main body 66, and the inner hole 6 of the channel tube 61 is connected.
1a is provided with a plurality of guide grooves 67a in the peripheral portion of the channel hole 67 penetrating the tip cover 65 and the main body 66. The treatment tool 68 shown by the broken line in FIG. 13 is positioned in the guide groove 67a. Also,
The rear end of the guide groove 67a inside the main body 66 has an arcuate shape 67b in order to smoothly guide the treatment instrument 68.

The position of the guide groove 67a is a position where the treatment tool is frequently projected (from 6 o'clock to 9 o'clock as shown in FIG. 13).
It is provided at the time position. Although the number of the guide grooves 67a is three in FIG. 13, it is not limited to this.
More may be provided.

In this endoscope, since the guide groove is provided in the channel hole, when a treatment instrument having a diameter smaller than the channel hole diameter is used, the protrusion position is secured even if the protrusion amount of the treatment instrument is increased. Therefore, the operability of the treatment tool is improved.
Further, since the circumferential movement does not occur during the projecting operation, the operability of the treatment tool is improved.

Next, an endoscope suction system provided with excessive suction determination means will be described. FIG. 15 shows a schematic configuration of this endoscope suction system, and FIG. 16 shows a time chart for explaining the operation of the suction system.

As shown in FIG. 15, the endoscope suction system 6
Reference numeral 9 denotes an endoscope 70, a light source device 71 for supplying illumination light,
And an air supply unit 72 for supplying air. Endoscope 70
The universal cord 78 is extended from the operation section 77 of
A light guide connector 75 is provided at its tip,
The light guide connector 75 is connected to the light source device 71.

The light source device 71 is equipped with an excess suction determination circuit 71a for monitoring suction operation and determining excess suction.

An air supply port 73 is provided in the operating section 77, and the air supply port 73 and the air supply unit 72 are connected to the tube 7.
4 and so on. The excessive suction determination circuit 71a provided in the light source device 71 and the air supply unit 72 are electrically connected. The relationship between the excess suction determination circuit 71a and the air supply unit 72 is as shown in the time chart of FIG.

In the excessive suction determination circuit 71a, as shown in FIG.
As shown in (A), a threshold value 79 for the excessive suction level and the normal suction level is set, and when the suction level exceeds this threshold value 79, as shown in FIG. A signal indicating that air supply is ON is output to the unit 72.

When this air supply is turned on, the air supply unit 72
The gas is forcibly fed to the distal end portion 76 side of the insertion portion 79 from the air feeding tube inside the endoscope 70 (not shown) through the tube 74, and air is ejected from the nozzle. In the system 69 of the present embodiment, the light source device 71 and the air supply unit 72 are separate bodies, but an embodiment in which both are integrated may be used.

With such a structure, the air supply unit 72 can be used when excessive suction occurs due to suction of living tissue.
By the air supply by, the tip portion 76 is separated from the tissue, and damage to the tissue can be prevented. Further, since the tissue and the tip end are not in close contact with each other, a predetermined suction amount can be secured.

[Additional Notes] 1. In an endoscope having a mouthpiece for fixing the tip of a light guide member composed of a fiber bundle to the tip end portion of the endoscope, a notch provided on the rear end side of the mouthpiece in a direction orthogonal to the longitudinal direction of the mouthpiece. An endoscope characterized in that it has a covering tube fixing means for fastening and fixing a covering tube covering the light guide member. 2. The endoscope according to appendix 1, wherein the cutout portion is provided in a direction adjacent to a built-in object that constitutes the endoscope.

1 '. In the base of the light guide tip of the endoscope, in the outer periphery of the end near the base end side of the endoscope of the base, a slit portion is provided so as to be orthogonal to the central axis of the base in the longitudinal direction, and in the slit portion, a light guide fiber is provided. An endoscope characterized in that a covering material for exterior is fastened and fixed. (Purpose of Supplementary Note 1 ') Thinner diameter and improved fixing strength of the light guide protection tube. 2 '. The endoscope according to supplementary note 1 ', wherein the slit portion is provided in a direction adjacent to a built-in object forming the endoscope.

3. A treatment instrument to be combined with a large-diameter channel of an endoscope, in which a bending portion having a sheath width larger than the inner diameter of the channel is provided on the distal end side of the sheath portion of the treatment instrument. (Background of Appendix 3) Conventionally, in an endoscope in which a treatment instrument is inserted, a treatment instrument to be combined with a large-diameter channel is
When combined with treatment tools used for small diameter channels,
There is a drawback in that the treatment tool has a large gap between the outer diameter and the inner diameter of the channel, and the treatment tool is idle in the channel (clearance C in FIG. 6), which makes it difficult to guide the treatment tool to the target site. For this reason, in order to solve this drawback and to provide a treatment tool with good operability, the structure of Appendix 3 is adopted in order to achieve this object.

4. A treatment instrument in which a large-diameter channel of an endoscope is combined, wherein a bending portion having a sheath width larger than the channel inner diameter is provided on the distal end side of the sheath portion of the treatment instrument, and an inclination is provided at the distal end portion.

5. In an imaging device using a solid-state image sensor, a part of the lead leg is extended in front of the solid-state image sensor,
An imaging device with a circuit board connected to the lead legs. (Background of Supplementary Note 5) As a conventional technique, for example, Japanese Patent Laid-Open No. 2-
Japanese Patent Publication No. 299629 discloses a configuration in which lead legs extend behind a solid-state image sensor, and a circuit board and a cable are arranged there. In the conventional configuration, the circuit board is arranged in the image pickup device (as a result, the endoscope device).
Has been a factor in extending the hard length of. Therefore, for this reason, it is an object to provide an image pickup apparatus that can realize a shortened rigid length, and the configuration of Appendix 5 is adopted to achieve this object.

[0073]

As described above, according to the present invention, in the endoscope having the mouthpiece for fixing the tip of the light guide member composed of the fiber bundle to the tip portion of the endoscope, the rear end side of the mouthpiece, Since the coating tube fixing means for fastening and fixing the coating tube covering the light guide member by thread binding or the like is provided in the cutout portion provided with the notch in the direction orthogonal to the longitudinal direction of the base, fastening of the coating tube The diameter of the fixed portion can be made small, and thus the diameter of the distal end portion of the endoscope can be reduced.
Further, a base having a cutout can also be realized at low cost.

[Brief description of drawings]

FIG. 1 is a sectional view of a distal end portion of an endoscope according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing a light guide base portion.

FIG. 3 is a sectional view taken along line AA of FIG. 1;

FIG. 4 is a perspective view showing a base provided with a slit portion.

FIG. 5 is a sectional view of a distal end side of an endoscope according to a second embodiment of the present invention.

FIG. 6 is an explanatory view showing a state in which a treatment tool is inserted into a channel.

7 is an explanatory view showing a state in which a treatment tool different from the treatment tool of FIG. 6 is inserted into a channel.

FIG. 8 is a sectional view of a distal end side of an endoscope according to a third embodiment of the present invention.

FIG. 9 is a perspective view showing the distal end side of an endoscope having means for eliminating damage to the mucous membrane.

FIG. 10 is an explanatory view of the operation according to the CC cross section of FIG. 9;

FIG. 11 is a perspective view showing the distal end side of an endoscope having means for eliminating damage to the mucous membrane.

FIG. 12 is an explanatory view of the action of the DD cross section of FIG. 11;

FIG. 13 is a front view showing a distal end surface of an endoscope in which a guide groove is provided in a channel hole.

14 is a cross-sectional view of the distal end portion of the endoscope taken along the line EE in FIG.

FIG. 15 is a schematic configuration diagram of an endoscope suction system provided with excessive suction determination means.

16 is an explanatory view of the operation of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Insertion part 2 ... Tip part 3 ... Air supply / water supply channel 4 ... Nozzle 5 ... Light guide 6 ... Objective lens system 7 ... Imaging device 8 ... Tip cover 9 ... Curved part 11 ... (Light guide) base 11b ... Slit part 12 ... Exterior tube 13 ... Protective tube 14 ... Thread binding 16 ... Channel 17 ... Covering tube fixing means

Claims (1)

[Claims] 1. An endoscope having a mouthpiece for fixing the tip of an optical guide member composed of a fiber bundle to the tip of the endoscope, wherein a rear end side of the mouthpiece is cut out in a direction orthogonal to a longitudinal direction of the mouthpiece. An endoscope characterized by having a covering tube fixing means for fastening and fixing a covering tube for covering the light guide member at a notch portion provided with.