JPH0576490A - Side looking electronic endoscope with insertable operative tool - Google Patents

Abstract

PURPOSE:To make it possible to perform smoothly taking-in and -out of an operative tool when a standing stage is stood. CONSTITUTION:In a side observation-type endoscope wherein a standing stage 16 is provided in the neighborhood of an outlet of an operative tool perforating channel 13 in the endoscope and bending operation of the operative tool 8 is performed while it is fitted in an arc channel 19 of this standing stage 16, a straight arc channel 19c is formed as the arc channel 19 and the angle of slope of the straight part 19c is made different from the angle of slope of the wall of an outlet when the standing stage is stood. In addition, an arc part 19b with a curvature radius guiding an operative tool 8 curved at the time of standing is formed as a part of the arc channel 19 of the standing stage 16. As the arc part 19b disperses a force in the tangential direction and the straight part 19c eliminates concentration of the force at one point, the treating tool can smoothly be taken in and out.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a side-view endoscope in which a treatment tool can be inserted, and more particularly, to a side-view endoscope in which a treatment tool guided to a distal end portion is led out in a lateral direction of the endoscope.

[0002]

2. Description of the Related Art A CCD (Charge Cou
An endoscope that observes only with an electronic endoscope having a pled device) at its tip or only with optical means is known. In this type of endoscope, not only the state inside the observed body is observed,
Procedures such as incision, biopsy, and recovery are performed using various treatment tools such as forceps.

FIG. 6 shows the structure of the tip of a conventional side-viewing type electronic endoscope.
A forceps port (a part of the treatment instrument insertion channel) 3 communicating with the treatment instrument insertion channel 2 and an observation window (not shown) are provided on a side face portion (lower side in the drawing) of the endoscope tip portion 1 instead of the front face portion. An irradiation window and the like are provided. Then, a CCD 4 which is a solid-state image pickup device is arranged on the slightly upper side in the middle of the figure,
The image captured from the observation window is captured by the CD 4. Therefore, the side-view endoscope can observe and treat a portion existing in a direction perpendicular to the insertion direction.

On the side surface (lower side) of the endoscope distal end portion 1, a standing stand 5 which rotates in the direction of the forceps opening 3 is attached by a shaft 6 as shown in the drawing. A wire 7 connecting to the section is connected. Therefore, by pulling the wire 7, the upright table 5 is rotated, and the rotating upright table 5 raises the treatment tool 8 drawn out from the forceps port 3 to a predetermined position as shown by a chain line. be able to. In this case, an arcuate groove 9 for guiding the treatment instrument 8 is formed on the upright table 5, so that the bending operation of the treatment instrument 8 can be ensured. Examples of the treatment tool 8 include a biopsy forceps, scissors forceps, a high-frequency knife, a high-frequency snare, a high-frequency hemostatic tool, a cytodiagnosis brush, and an injection needle. Various treatments can be performed while bending the treatment tool 8. Will be seen.

[0005]

However, the conventional endoscope has a problem that the treatment instrument 8 cannot be smoothly taken in and out when the endoscope is bent by the upright table 5. That is, as shown in FIG. 7, the circular arc groove 9 formed in the upright base 5 for engaging the treatment instrument 8.
Has a gentle curve on its bottom surface, and when the upright stand 5 is upright, it contacts the treatment instrument 8 at a point A of the arc groove 9. Moreover, at this time point, since the treatment tool 8 is bent at a large angle, the force applied to the treatment tool 8 when the treatment tool 8 is taken in and out does not work effectively, and a smooth withdrawal operation is not performed. .. In particular, in recent years, the bending angle of the treatment instrument 8 tends to be large, and it is required to smoothly take in and out the treatment instrument 8.

The present invention has been made in view of the above problems, and an object thereof is a side-view endoscope in which a treatment tool can be inserted and with which the treatment tool can be smoothly taken in and out when the stand is raised. To provide.

[0007]

In order to achieve the above object, the invention according to the first aspect provides a standing stand near the exit of a treatment instrument insertion channel in an endoscope, and an arc of the standing stand. In a side-viewing endoscope that bends the treatment tool in the lateral direction while engaging the treatment tool in the groove, a linear arc groove is formed as the arc groove of the stand, and at the time of standing of the stand. The inclination angle of the straight portion of the arc groove is different from the inclination angle of the wall of the outlet passage facing the arc groove. According to the second aspect of the invention, a standing stand is provided in the vicinity of the exit of the treatment tool insertion channel in the endoscope, and the treatment tool is bent in the side direction while engaging the treatment tool in the arc groove of the standing stand. In the side-viewing endoscope to be operated, an arc groove having a radius of curvature for guiding a treatment tool curved at the time of standing is formed as a part of the arc groove of the upright table.

[0008]

According to the structure of the first aspect, the treatment tool abuts on the straight line portion of the arc groove when the upright table is erected, and this straight line portion serves as a guide for eliminating the concentration of one point of force. It is possible to take in and out smoothly. In addition, since the treatment tool on the outlet passage side does not move closely along the wall when it is led out, the wall of the outlet passage does not become a resistance and hinder the smooth dispensing operation.

Further, according to the structure of the second aspect, for example, an arc groove having a predetermined radius of curvature is formed in the middle portion of the upright table, and the treatment tool bent in the arc portion of the arc groove is abutted. Contact. Therefore, the arcuate portion serves as a guide for the bent treatment instrument, and the treatment instrument can be smoothly taken in and out when the upright stand is erected.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the configuration of a side-viewing type electronic endoscope into which a treatment tool according to the first embodiment can be inserted, and FIG. 1 (a) shows a state in which the forceps port is on the lower side. A side view of the distal end portion of the endoscope, and FIG. 6B is a sectional view taken along line CC of FIG. In the figure (a), the tip part 10 is a wire 12a, 1 connecting to the operating part.
2b is attached to the bending portion 11 in a mounted state, and the tip portion 10 can be bent by operating the wires 12a and 12b. Further, a forceps port 14 that is an outlet passage of the treatment instrument insertion channel 13 is formed in the distal end portion 10 so as to communicate with the treatment instrument insertion channel (forceps channel) 13 arranged in the curved portion 11. The treatment instrument 8 inserted through the treatment instrument insertion channel 13 is led out to the outside from the forceps port 14.

As shown in FIG. 1C, the forceps port 14 of the above embodiment has a vertically long circular cross section, and the treatment instrument 8 inserted into the forceps port 14 is inserted from the treatment instrument insertion channel 13. It can be bent with a large radius of curvature toward the outlet of the forceps port 14. The lower wall of the forceps port 14 is a straight wall, while the upper wall is a curved wall as shown by R in the figure, and the treatment instrument 8 can be bent with a larger radius of curvature. According to this configuration, the treatment tool 8
The bending angle of is also large. That is, in the embodiment, the cross-sectional shape of the forceps port 14 that is the outlet passage is a circular shape having a long diameter in the bending direction of the treatment tool so that the curvature radius and the bending angle when bending the treatment tool 8 can be set to be large. We are trying to expand the area.

Further, as shown in each drawing, a stand 16 is rotatably supported by a shaft pin 17 in the distal direction near the forceps port 14, and a wire 18 is attached to the stand 16.
Is attached, and the standing base 16 can be rotated to the position of the chain line 100 by pulling the wire 18. The treatment tool 8 is attached to the stand 16.
Is formed with a circular arc groove 19 for engaging the
When the treatment instrument 8 to be inserted into the upright position is raised by the upright stand 16, the treatment instrument 8 is held between the arcuate groove 19 and the inner wall of the forceps opening 14 as shown by the chain line.

FIG. 2 shows the detailed structure of the upright stand 16 of the first embodiment, and the arcuate groove 19 serves to engage the treatment tool 8 as shown in FIG. It is composed of an arc groove having a radius adapted to the side curvature of the tool 8. And
As shown in FIG. (A), the circular arc groove 19 has a gentle first arcuate portion 19a, a second arcuate portion 19b having a large radius of curvature, a straight line portion 19c, and a reverse arcuate tip, depending on the shape of the bottom surface. It is composed of the section 19d. Here, the radius of curvature of the second arcuate portion 19b is adjusted to the radius of curvature of the bending portion of the treatment instrument 8 so that the bending portion of the treatment tool 8 abuts when the upright stand 16 stands up. Treatment tool 8
The force applied to is distributed, and the direction of the force can be changed to the tangential direction of the arc. The linear portion 19c is
This is a portion with which the linear portion at the tip of the bent portion of the treatment tool 8 comes into contact. Generally, also in the treatment tool 8, a hard portion (straight portion) is provided at the distal end portion, and a curved portion is connected to this hard portion, and the treatment portion 8 is connected to the straight portion 19c.
Often the hard parts of the abut. In addition, the reverse arc portion 19d
Is provided so that the bending of the treatment instrument 8 can be released smoothly when the standing base 16 is retracted.

Further, in FIG. 1A, a CCD 20 is arranged slightly above the middle stage of the tip portion 10.
An observation window 21 shown in FIG. 1 (b) is optically connected to 0, and an illumination window 22 is provided near the observation window 21. As shown in FIG. 1C, an image guide 23 is connected to the observation window 21 and a light guide 24 is connected to the illumination window 22. Therefore, the object image to be observed obtained by irradiating the predetermined light from the illumination window 22 passes through the observation window 21 and the CCD 20.
It will be captured by and finally displayed as an image on the monitor. A nozzle 26 for injecting cleaning water is provided in the vicinity of the observation window 21.
(Air) / W (Water) supply path 27 is connected,
Cleaning water or air can be supplied to the observation window 21 through the nozzle 26.

Further, although not shown, the above-mentioned tip portion 1
0, the curved portion 11 is integrally formed with a support portion having an operation portion via an insertion portion, and a forceps insertion port communicating with the treatment instrument insertion channel 13 is disposed in the support portion.
Further, the operation section is provided with a camera shutter button, upper and lower and left and right angle knobs, and an upright knob for operating the upright stand 16 with a wire 18.

The first embodiment is constructed as described above, and in the electronic endoscope, a treatment tool 8 for performing various treatments while observing an image of the inside of the body to be observed taken through the observation window 21 is inserted from the forceps insertion port. It is introduced into the forceps port 14 having a vertically elongated circular shape through the treatment tool insertion channel 13. Then, when the treatment tool 8 is pulled out from the forceps port 14 by a predetermined length, the standing knob of the operating portion is operated to pull the wire 18, and as shown in FIG. 8 is bent by using the curved wall R on the upper side of the vertically elongated circular forceps port 14 as a guide. When the upright table 16 is completely raised, the treatment instrument 8 is guided by the arcuate groove 19 as shown in FIG. 3, but in the figure, the curved portion 8b of the treatment instrument 8 is bent to the second arcuate portion 19b. The hard portion 8a abuts on the straight portion 19c. Therefore, when standing up, the treatment instrument 8
Is guided by the second arcuate portion 19b and the straight portion 19c. Particularly, in the second arcuate portion 19b, the force when the treatment instrument 8 is taken in and out is dispersed, and the direction of the force is an arc. It can be changed to the tangential direction, and the treatment instrument 8 can be favorably guided in the direction of the straight line portion 19c at the time of derivation.

Of course, the linear portion 19c in the above case stabilizes the treatment instrument 8 and prevents one point of force from being concentrated. On the other hand, on the wall surface B with which the treatment tool 8 abuts at the forceps port 14, the treatment tool 8 does not move exactly along the wall surface.
It does not prevent the smooth loading and unloading of.

FIGS. 4 and 5 show the structure of the second embodiment. In this second embodiment, the arcuate groove is mainly composed of straight portions. That is, as shown in FIG.
The arc groove 29 of the stand 28 is composed of a gentle arcuate portion 29a, a straight line portion 29b, and a reverse arcuate portion 19c. According to the second embodiment, although there is no tangential force conversion by the arcuate portion 19b as described above, the linear portion 29b stabilizes the treatment instrument 8 and guides the force applied to the treatment instrument 8 at the time of derivation. It can be effectively used as an output.

[0019]

As described above, according to the first aspect of the invention, in the endoscope for bending the treatment tool while receiving the treatment tool in the arc groove of the upright table, the arc groove of the upright table is used. Since the straight circular arc groove is formed and the inclination angle of the circular groove linear portion at the time of standing of the upright table is different from the inclination angle of the wall of the outlet passage, the straight portion guides the treatment tool when standing. It can be put in and taken out smoothly.

Further, according to the second aspect of the invention, since the arcuate groove is formed on the upright table with a radius of curvature for guiding the curved treatment instrument at the time of standing up, the force applied to the treatment instrument is dispersed and the tangential direction. It is possible to smoothly convert the treatment tool into and out of the treatment tool when standing up.

[Brief description of drawings]

1A and 1B are views showing a configuration of a side-viewing endoscope into which a treatment tool can be inserted according to a first embodiment of the present invention, FIG. 1A being a cross-sectional view showing a side surface of a distal end portion, and FIG. The bottom view of the endoscope of FIG. (A), FIG. (C) is CC sectional drawing of FIG. (A).

2A and 2B are views showing a configuration of a stand of the first embodiment, FIG. 2A being a front view and FIG. 2B being a side sectional view.

FIG. 3 is a cross-sectional view showing a state in which a treatment tool is bent by an upright stand in the endoscope of the first embodiment.

FIG. 4 is a front view showing a configuration of a stand of a second embodiment.

FIG. 5 is a cross-sectional view showing a state in which a treatment tool is bent by an upright table in the configuration of the second embodiment.

FIG. 6 is a side sectional view showing a configuration of a distal end portion of a conventional electronic endoscope.

FIG. 7 is a cross-sectional view showing a state where the treatment tool is bent by a standing stand in the endoscope of FIG.

[Explanation of symbols]

 1, 10 ... Tip part, 2, 13 ... Treatment tool insertion channel, 3, 14 ... Forceps mouth, 5, 16, 28 ... Stand, 8 ... Treatment tool, 19, 29 ... Arc groove, 19b ... Second arc shape Part, 19c, 29b ... Straight part.

Claims (2)

[Claims] 1. A side-view mold in which a standing stand is provided in the vicinity of an exit of a treatment tool insertion channel in an endoscope, and the treatment tool is bent laterally while engaging the treatment tool with an arc groove of the standing stand. In the endoscope, a linear arc groove is formed as the arc groove of the upright table, and the inclination angle of the straight part of the arc groove at the time of standing of the upright table is the inclination angle of the wall of the outlet passage facing the arc groove. A side-view type endoscope into which a treatment tool can be inserted, the endoscope being formed differently from the above. 2. A side-view mold in which a standing base is provided near the exit of the treatment tool insertion channel in the endoscope, and the treatment tool is bent laterally while engaging the treatment tool with an arc groove of the standing base. In the endoscope, a side-view endoscope in which a treatment instrument can be inserted, characterized in that an arc groove having a radius of curvature for guiding a curved treatment instrument at the time of standing is formed as a part of the arc groove of the upright table.