JPH09234182A - Endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily observe a processing member through an observation optical system, and improve processing ability in an endoscope provided with at least two processing member inserting channels at a tip part of an insertion part by providing a raising device to regulate a direction of the processing member introduced out of each mouth part of the processing member insertion channels. SOLUTION: A tip part 1 of an endoscope insertion part is composed of a tip rigid member 2, and an objective lens 5 and a lighting lens 6 are provided at an upper surface part of the tip part 1. Channel aperture parts 11a, 11b are respectively provided on the right and left of the objective lens 5 and the lighting lens 6, and at the aperture parts 11a, 11b, a first and a second forceps raising base 15a, 15b are respectively provided. Each forceps raising base 15a, 15b is installed to be rotatable about a center of a shaft 16a, 16b supported on the tip rigid part 2. By performing push-pull operation to each raising operation wire 22a, 22b by a hand side operation part, each forceps raising base 15a, 15b is raised or fallen to select its raising angle freely.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an endoscope in which a treatment instrument is inserted into a body cavity through a treatment instrument insertion channel and various treatments such as mucosal resection in the body cavity are performed by the treatment instrument.

[0002]

2. Description of the Related Art Conventionally, an endoscope in which forceps ports are provided in front and rear or left and right of an observation optical system at a distal end portion of an insertion portion is disclosed in Japanese Utility Model Laid-Open No. 48-81689. In this endoscope, the forceps are projected from these forceps ports to guide the tip to the surgical site in the body cavity, and the treatment in the body cavity has been performed while observing the tip with an observation optical system.

However, these forceps ports are simply opened, and the direction of the forceps projected from the forceps port is substantially determined, so that the direction of the forceps cannot be freely determined.

[0004]

In the conventional endoscope, the direction of the treatment tool coming out from each forceps port is fixed in the cross section perpendicular to the insertion axis direction of the insertion section, and cannot be arbitrarily changed. For this reason, the treatment tool does not always come to a position where it can be easily seen with respect to the visual field of the observation optical system, and it is generally difficult to observe the surgical site with the treatment tool. In addition, the orientation of the treatment instrument and its interval cannot be freely changed in the cross-sectional direction perpendicular to the insertion axis direction of the insertion section, and the treatment instrument spreads in both the left and right directions, which makes it impossible to perform detailed treatment. However, there is a drawback that it is very difficult to carry out the treatment work.

The present invention has been made in view of the above problems, and a treatment tool that comes out from the mouths of the channels provided on the left and right of the observation optical system at the distal end of the endoscope insertion portion is observed through the observation optical system. It is an object of the present invention to provide an endoscope having an improved treatment ability, which is easy to perform and a treatment work can be easily performed.

[0006]

According to the present invention, at least two treatment tool insertion channels for leading out a treatment tool for treating a body cavity are provided at the distal end portion of an insertion section having an observation optical system,
In an endoscope in which the mouth portion is arranged with the observation optical system sandwiched between the mouth portions of the treatment instrument insertion channel, a raising device for regulating the orientation of the treatment instrument drawn out from the mouth portion is provided. It is a thing. It is possible to change the orientation of the treatment tool that has come out of the mouth of the channel, and it is easy to observe the surgical site with the treatment tool through the observation optical system and to perform the treatment work easily.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION

(First Embodiment) A first embodiment of the present invention will be described with reference to FIGS. (Structure) FIG. 1A is a plan view of the distal end portion 1 of the endoscope insertion portion as seen from above, and FIG. 1B is a vertical cross-sectional view of the distal end portion 1. 1C is a cross-sectional view taken along the line C-C in FIG.

The distal end portion 1 of the endoscope insertion portion is constituted by a distal end hard member 2, and the distal end hard member 2 is covered by a distal end cover 3. The tip portion 1 is connected to the tip of the bending portion 4 of the endoscope insertion portion. The bending portion 4 can be forcibly bent by an angle knob or the like of a hand operation portion (not shown). An objective lens 5 and an illumination lens 6 are provided on the upper surface of the tip portion 1, and the objective lens 5 is arranged behind the illumination lens 6, and the objective lens 5 and the illumination lens 6 are arranged in the insertion axis direction of the insertion portion. It is located at the front and rear positions along the line. A nozzle 7 that opens toward the outer surfaces of the objective lens 5 and the illumination lens 6 is provided on the hand side of the objective lens 5.

The objective lens 5 constitutes an observation optical system, through which the inside of the body cavity can be observed. The objective lens 5 is configured to form an image on an image pickup unit or an image guide fiber (not shown) via an optical lens (not shown). A light guide fiber 8 is connected to the illumination lens 6, and the light guide fiber 8 is provided in the distal end hard member 2 to the illumination lens 6.
It is built in so that it can be bent toward.

To the left and right of the objective lens 5 and the illumination lens 6,
Channel openings 11a and 11b are provided as mouths of the treatment instrument insertion channels 10a and 10b, respectively. The channels 10a and 10b for inserting each treatment tool are inserted into the channel pipe 1 from the channel openings 11a and 11b.
2 is formed by a passage communicating with the channel tube 13 via the channel 2, and each of the treatment instrument insertion channels 10a, 10b
The hand side of is connected to a treatment tool introducing port of an operation unit (not shown).

On the other hand, the channel openings 11a, 11
In b, a raising device that regulates the orientation of the treatment instrument derived from this is incorporated. That is, the left channel opening 11a is provided with the first forceps raising base 15a, and the right channel opening 11b is provided with the second forceps raising base 15.
b is provided.

FIG. 1B shows a first forceps raising base 15a (15).
b) shows the periphery of the channel opening 11
The a and 11b are formed in the distal end hard portion 2 as elongated openings along the insertion axis direction of the insertion portion.

As shown in FIG. 1C, the first forceps raising base 1
5a is attached so as to be rotatable around a shaft 16a supported by the distal end hard portion 2. In addition, the second forceps raising base 15
Similarly, b is also attached so as to be rotatable around a pivot shaft 16b supported by the distal end hard member 2. The first forceps raising base 15a is pivotally supported such that the raising center axis direction 17a when viewed from a cross section perpendicular to the insertion axis direction of the insertion portion is inclined to the optical axis L side of the observation optical system. The rising center axis direction 17a is the first
It is a plane direction orthogonal to the pivot shaft 16a that is the rotation center of the forceps raising base 15a, and this raising center axis direction 17a is in front of the observation optical system when viewed from a cross section perpendicular to the insertion axis direction of the insertion portion. , And intersects the optical axis L in the field of view. Further, the raising center axis direction 17b of the second forceps raising base 15b is the optical axis L of the observation optical system when seen from a cross section perpendicular to the insertion axis direction of the insertion portion.
Is parallel to and does not intersect the optical axis L. Rise center axis direction 1
The points 7a and 17b intersect each other at a point P in the visual field. The point P is located on the right side of the optical axis L.

As shown in FIG. 1 (c), the light guide fiber 8 is arranged under the distal end hard member 2 and is watertightly covered and attached by a lid member 18. FIG. 2 is a cross-sectional view of a portion taken along line xx in FIG. 1 (c). As shown in FIG. 2, wire receiving members 21a and 21b are attached to the free ends of the forceps raising bases 15a and 15b. The ends of the raising operation wires 22a and 22b are connected via
Each of the raising operation wires 22a and 22b is guided to a hand operation unit (not shown) through a wire guide tube 23, and the raising operation wire 22 is operated by operating a raising operation knob (not shown).
Forceps raising base 15 by pushing and pulling a and 22b
The a and 15b can be raised or lowered about the pivots 16a and 16b, and the rising angle can be freely selected.

FIG. 1C shows the first forceps raising base 15a and the second forceps raising base 15a.
The state where the forceps raising base 15b is raised most is shown.
The rotation surface of the first forceps raising base 15a is inclined with respect to the optical axis L of the objective lens 5 so that the rotation surface of the first forceps raising base 15a intersects the plane including the optical axis L at the upper side, while the second forceps raising base 15b. The rotation surface of is parallel to the plane including the optical axis L.

A stopper 31 is provided on the first forceps raising base 15a, and the first hard member raising base 1 is attached to the distal end hard member 2.
There is provided a stopper receiver 32 with which the stopper 31 abuts when 5a rises to the maximum. Further, a stopper 31 is also provided on the second forceps raising base 15b, and when the second forceps raising base 15b is raised to the maximum, similarly, the distal end hard member 2 is formed.
The stopper receiver 32 is provided on the above.
Therefore, the first forceps raising base 15a and the second forceps raising base 1
5b is prevented from rising too much.

First forceps raising base 15a and second forceps raising base 1
In order to prevent lateral displacement of 5b, the distal end hard member 2 is provided with a guide portion 33 having an arcuate peripheral surface for slidingly guiding the stopper 31.

A spherical groove 28 is formed on the lower side of the channel openings 11a and 11b. Further, the treatment tool guide surface of each forceps raising base 15a, 15b has a guide groove 29 that is shaving in a spherical shape, so that when the treatment tool is inserted and removed, the treatment tool is correctly positioned in the central axis direction 17a, A guide means for 17b is constructed.

(Operation) FIG. 3 shows a situation in which the endoscope insertion portion is introduced into the body cavity and the treatment instrument is guided through the two treatment instrument insertion channels 10a and 10b for treatment. For example, the grasping forceps 2 through the treatment tool insertion channel 10a on the left side
5 and the grasping forceps 25 moves the first forceps raising base 15
a is used as a guide to project from the channel opening 11a into the body cavity, and the high-frequency snare 26 is guided through the treatment tool insertion channel 10b on the right side. The high-frequency snare 26 is guided from the channel opening 11b using the second forceps raising base 15b as a guide. Stick out into the body cavity.

Then, the mucous membrane 27 is grasped by the grasping forceps 25, and the mucous membrane 27 is excised by the high-frequency snare 26. The grasping forceps 25 can change the angle to be raised by changing the raising angle of the first forceps raising base 15a, and the high-frequency snare 26 by changing the raising angle of the second forceps raising base 15b. Moreover, the angle between the two treatment tools when viewed from the side can be freely changed. The position of the grasping forceps 25 and the high-frequency snare 26 and the angle between them are adjusted to excise the mucous membrane 27.

Further, as shown in FIG. 1 (c), since the raising central axis directions 17a and 17b of the forceps raising bases 15a and 15a intersect in front of the observation optical system, the grasping forceps 23 is formed.
And the high frequency snare 26 are connected to the channel openings 11a and 11b.
The distance between them can be freely changed by the length pushed out from.

Although the gripping forceps 25 and the high-frequency snare 26 are used here, the two channel openings 1
There is no limitation on the type of treatment tool that is ejected from 1a and 11b.

(Effect) The treatment tool which is guided out by the first forceps raising base 15a and the second forceps raising base 15b is the first one.
By changing the rising angles of the forceps raising base 15a and the second forceps raising base 15b, the treatment tools can be individually changed or the angle C between the treatment tools can be freely changed, so that the treatment tools can be arranged at desired positions. , Easy to treat.

Also, since the center axis directions 17a and 17b of the forceps raising bases 15a and 15b intersect in front of the observation optical system, the treatment tool is inserted from the first forceps raising bases 15a and 15a depending on the distance. Since the distance between the treatment tools when viewed from the cross-sectional direction perpendicular to the insertion axis direction of can be changed, the treatment is easy.

Furthermore, since the raising central axis directions 17a and 17b of the forceps raising bases 15a and 15b intersect in the field of view, the treatment instruments are pushed out in the directions in which they intersect, so that the positions of the treatment instruments can be confirmed. The workability is improved.

Further, since the groove 28 cut into a spherical shape is formed on the lower side of the channel openings 11a, 11b, even when the first forceps raising base 15a and the second forceps raising base 15b are raised by the groove 28. The treatment instrument can be bent with a gentle curve. Therefore, it is possible to improve the insertability and durability of the treatment tool.

(Second Embodiment) A second embodiment of the present invention will be described with reference to FIG. (Structure) In this embodiment, when the raising central axis direction 17b of the second forceps raising base 15b is viewed from a cross section perpendicular to the insertion axis direction of the insertion portion, it is slightly tilted toward the optical axis L side of the observation optical system. The second forceps raising base 15b is pivotally supported so that The center axis direction 17a of the first forceps raising base 15a and the center axis direction 17b of the second forceps raising base 15b are the optical axis of the observation optical system when viewed from a cross section perpendicular to the insertion axis direction of the insertion portion. It is tilted to the L side and intersects at a point P in the visual field. However, the point P is displaced to the right from the optical axis L. Other configurations are the same as those of the first embodiment.

(Effect) According to this embodiment, since the treatment tool work can be performed at a position where the treatment tools intersect with each other closer to the optical axis L side and closer to the center of the visual field, the treatment work can be performed by the above-described first method. It is easier to perform than the embodiment.

(Third Embodiment) Referring to FIG. 5, a third embodiment of the present invention will be described. (Structure) Also in this embodiment, the rising center axis direction 17a of the first forceps raising base 15a and the rising center axis direction 17b of the second forceps raising base 15b are viewed from a cross section perpendicular to the insertion axis direction of the insertion portion. All of them are tilted toward the optical axis L of the observation optical system and intersect at a point P in the visual field. Moreover, the point P includes the optical axis L and lies on a plane along the insertion axis direction of the insertion portion. The main constituent members are left-right symmetric, and the other basic structure is the same as that of the first embodiment.

(Effect) According to the present embodiment, the first
Since the treatment tools derived from the forceps raising base 15a and the second forceps raising base 15b can be handled at the center position of the visual field, the treatment is easy. Further, since the respective constituent parts can be configured symmetrically, it is easy to process and assemble, and the cost can be reduced.

(Fourth Embodiment) The fourth embodiment of the present invention will be described with reference to FIG. (Structure) FIG. 6A shows a state in which the forceps raising base is raised. In this embodiment, the first forceps raising base 15a is small, and the second forceps raising base 15b is larger than that. FIG.6 (b) shows the small 1st forceps raising stand 15a,
Figure (c) shows a large second forceps raising base 15b,
The small first forceps raising base 15a and the large second forceps raising base 15b have substantially similar shapes. In addition, the small first forceps raising base 15a is provided with a small-diameter treatment instrument insertion channel 10a.
Is also provided in the same small diameter channel opening 11a, and the large second forceps raising base 15b is provided in the same large diameter channel opening 11b of the large diameter treatment instrument insertion channel 10b. Other configurations are the same as those in the second embodiment.

(Effect) Channel 1 for inserting a small-diameter treatment instrument
A treatment instrument having a small diameter is passed through 0a, and a treatment instrument having a large diameter is passed through a treatment instrument insertion channel 10b having a large diameter. Therefore, each of the first forceps raising bases 15a, 15a,
Since 15b fits, the directionality when ejecting the treatment tool is improved, and since the treatment tool can be ejected at a desired position, it becomes easier to perform the treatment work.

(Fifth Embodiment) A fifth embodiment of the present invention will be described with reference to FIGS. 7 and 8. (Structure) FIG. 7A shows a state in which the first forceps raising base 15a and the second forceps raising base 15b are erected, and the first forceps raising base 15a constitutes a forceps raising base with a small raising angle. The second forceps raising base 15b constitutes a forceps raising base having a large raising angle. FIG. 7B shows the first forceps raising base 15a with a small raising angle, and FIG. 7C shows the second forceps raising base 15b with a large raising angle. Even when the first forceps raising base 15a with the small raising angle and the forceps raising base 15b with the large raising angle are in the inverted position, the treatment tool guide surface portion 30 has an angle with respect to the insertion axis direction of the insertion portion, The angle of the first forceps raising base 15a having an angle is D, and the angle of the second forceps raising base 15b having a large raising angle is inclined with an angle E. For those angles, the relationship of D <E is established. Other configurations are the same as those in the second embodiment.

In this embodiment, the images obtained through the objective lens 5 are shown in FIGS. 8A, 8B and 8C. That is, (a) is an image when both the first forceps raising base 15a with a small raising angle and the forceps raising base 15b with a large raising angle are in the inverted position and the treatment tool is ejected from both. Even in this state, the treatment tool s protruding from the second forceps raising base 15b having the large raising angle can be seen near the center of the image. (B) is a forceps raising base 15a having a small raising angle and a second forceps raising base 1 having a large raising angle.
5b, the treatment tool t is projected from both sides, and the first forceps raising base 15a having a small raising angle is raised little by little while the second forceps raising base 15b having a large raising angle is left inverted. Shows the state of being put in the field of view. (C) is a case where it is not desired to raise the first forceps raising base 15a having a small raising angle and to change the position of t in the field of view, raise the forceps raising base 15b having a large raising angle, and The state where the position is changed is shown.

(Effects) According to this embodiment, the forceps raising operation of the first forceps raising base 15a having the small raising angle can be performed.
Both s and t can be placed in the field of view, and the positional relationship between s and t can be changed within the field of view, and s and t can be changed to desired positions, improving operability. To do.

(Sixth Embodiment) A sixth embodiment of the present invention will be described with reference to FIG. (Structure) The positions of the left channel opening 11a and the right channel opening 11b are on the sides of the objective lens 5 and the illumination lens 6, and are displaced forward and backward in the insertion axis direction of the endoscope insertion portion. The other configurations are the same as those of the second embodiment.

(Effect) The same effect as the second embodiment can be obtained. In the first, second, fourth, fifth and sixth embodiments described above, the forceps raising base is asymmetrical to the left and right, but each forceps raising base is not limited to one of the left and right sides thereof, and the forceps raising base may be placed on either the left or right side. There is no problem even if you are left or right.

(Appendix) 1. An endoscope in which at least two treatment tool insertion channels for leading out a treatment tool for performing treatment in a body cavity are provided at a distal end portion of an insertion section having an observation optical system, and the mouth portions thereof are arranged with the observation optical system interposed therebetween. An endoscope in which each of the mouth portions of the treatment instrument insertion channel is provided with a raising device that regulates a direction of the treatment instrument that is drawn out from the mouth portion.

2. The endoscope according to claim 1, wherein the raising device includes a rotating raising base. 3. When the distal end portion of the insertion portion is viewed from a cross section perpendicular to the insertion axis direction of the insertion portion, at least one raising central axis direction of the raising device that guides the direction of the treatment tool that is led out from the mouth portion of the channel The endoscope according to claim 1, wherein the endoscope is tilted toward the optical axis of the observation optical system.

4. When the distal end portion of the insertion portion is viewed from a cross section perpendicular to the insertion axis direction of the insertion portion, the direction of the raising central axis of each of the raising devices that guides the direction of the treatment instrument that is guided out from the mouth of the channel is The endoscope according to supplementary note 1, wherein the two central axes in the rising direction intersect each other on a plane including the optical axis of the observation optical system and are inclined to the optical axis side of the observation optical system.

5. The endoscope according to claim 2, wherein one of the two forceps raising bases is larger than the other. 6. 3. The endoscope according to claim 2, wherein the angle of the treatment tool guide surface portion of one of the two forceps raising bases is larger than the angle of the other base. 7. The endoscope according to item 1, wherein the positions of the mouth portions of the two channels are displaced forward and backward with respect to the insertion axis direction of the insertion portion.

[0042]

As described above, according to the present invention, the opening portions of the plurality of treatment instrument insertion channels are arranged with the observation optical system interposed therebetween, and the direction of the treatment instrument guided to each of the mouth portions is regulated. Since the device is provided, the treatment tool extruded through the forceps raising base can be installed at a desired position and orientation, which facilitates treatment.

[Brief description of drawings]

1A and 1B show an endoscope according to a first embodiment, FIG. 1A is a plan view of a tip portion of an endoscope insertion portion as seen from above, FIG. 1B is a longitudinal sectional view of the tip portion, and FIG. ) Is C- in (b)
The cross-sectional view which follows the C line.

FIG. 2 is a sectional view of a tip portion taken along line xx in FIG. 1 (c).

FIG. 3 is an explanatory diagram of a usage state of the endoscope according to the first embodiment.

FIG. 4 is a transverse cross-sectional view of the tip portion of the endoscope according to the second embodiment.

5A and 5B show an endoscope according to a third embodiment, FIG. 5A is a plan view of a distal end portion of an endoscope insertion portion as seen from above, and FIG. 5B is a cross-sectional view of the distal end portion.

FIG. 6 shows an endoscope of a fourth embodiment, (a) is a cross-sectional view of the distal end portion of the endoscope insertion portion, (b) is a side view of the first forceps raising base, and (c) is. The side view of the 2nd forceps raising stand.

FIG. 7 shows an endoscope of a fifth embodiment, (a) is a cross-sectional view of the distal end portion of the endoscope insertion part, (b) is a side view of the first forceps raising base, and (c) is. The side view of the 2nd forceps raising stand.

FIG. 8 is an explanatory diagram showing an image state obtained through the objective lens of the endoscope of the fifth embodiment.

FIG. 9 is a plan view of the distal end portion of the endoscope according to the sixth embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Tip part of endoscope insertion part 5 ... Objective lens, 10a, 10b ... Treatment tool insertion channel 11a, 11b ... Channel opening part 10a, 10b ... Treatment tool insertion channel 15a ... 1st forceps raising stand 15b ... 2nd forceps raising stand 17a ... raising central axis direction 17b ... raising central axis direction L ... optical axis P ... intersection point

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hironobu Kono 2-43-2 Hatagaya, Shibuya-ku, Tokyo Inside Olympus Optical Co., Ltd. (72) Nobuyuki Matsuura 2-43-2 Hatagaya, Shibuya-ku, Tokyo No. Olympus Optical Co., Ltd. (72) Inventor Yukio Nakajima 2-34-2 Hatagaya, Shibuya-ku, Tokyo Olympus Optical Co., Ltd.

Claims (1)

[Claims] 1. A treatment tool insertion channel for leading out a treatment tool for treating a body cavity is provided at a distal end portion of an insertion section having an observation optical system, and the mouth portions thereof are arranged so as to sandwich the observation optical system. In the endoscope described above, each of the mouth portions of the treatment instrument insertion channel is provided with a raising device that regulates a direction of the treatment instrument that is drawn out from the mouth portion.