JPH0441841Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an endoscope with an improved structure for guiding the protruding direction of the distal end of a treatment instrument inserted through an insertion channel.

[Technical background of the invention and its problems]

For example, endoscopic treatment is performed on patients with pancreaticobiliary duct stenosis using a tube for injecting a contrast medium or an indwelling tube for examination. And, each of the above tubes is, for example,
As shown in Japanese Patent No.-58002, etc., the protruding direction of the treatment instrument is regulated by a treatment instrument guide installed at the distal end of the endoscope. In addition, this treatment instrument guide has a groove formed to guide the tip of the treatment instrument such as the tube, but this guiding groove is used to guide treatment instruments of various diameters, so the largest An arc-shaped cross section is used that is sized to match the diameter of the treatment instrument.

However, when guiding a treatment instrument with a relatively small outer diameter, the guide fluctuates greatly within the guiding groove, making it difficult to guide it stably and accurately. Incidentally, the indwelling tube has a diameter several times larger than the tube for injecting the contrast medium described above, and for this reason, the above-mentioned problem could not be ignored. Further, even if the treatment instrument has a relatively large outer diameter, it is guided while the circumferences of the circular parts are in contact with each other, so the contact position easily changes and there is also a tendency for the instrument to wobble.

[Purpose of invention]

This invention was made with attention to the above circumstances,
The purpose is to provide an endoscope that can stably and reliably guide the tip of each treatment tool in a predetermined direction even when using various treatment tools with different outer diameters. be.

[Summary of the idea]

The present invention provides a first guide groove in the treatment instrument guide and a smaller second guide groove within the first guide groove, and a treatment instrument with a relatively large outer diameter is guided by the first guide groove. However, the treatment instrument having a relatively small outer diameter is an endoscope that is guided by the second guide groove.

[Example of idea]

An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

FIG. 1 shows an endoscope, which consists of an operating section 1, an insertion section 2, and a universal cord 3. The insertion section 2 has a flexible tube section 4 whose proximal end is connected to the operating section 1; The flexible tube 4 is connected to the tip thereof, and a bending tube section 5 is connected to the tip thereof, and a tip forming part 6 is connected to the tip thereof. Further, the operating section 1 is provided with an angle knob 7 of a bending operation mechanism, and the angle knob 7 is used to operate the bending operation mechanism to remotely bend the bending tube section 5. . An observation window 9 and an illumination window 10 are installed on the upper wall part 8 of the distal end component part 6 in line with the longitudinal axis direction of the insertion part 2. The observation window 9 is the insertion part 2
It is optically connected to the eyepiece section 11 of the operating section 1 via an image transmission optical system (not shown) inserted therein, so that the field of view seen through the observation window 9 can be observed from the eyepiece section 11. It's getting old. Further, the illumination window 10 emits illumination light electrically transmitted through a light guide (not shown) into the field of view.

A distal end opening 13 of an insertion channel 12 is formed in the upper wall portion 8 of the distal end forming portion 6 side by side with an observation window 9 and an illumination window 10 . The distal end opening 13 has a long groove shape in the longitudinal axis direction of the insertion section 2, and the distal end of the insertion channel 12 opens into the proximal side wall of the distal opening 13, as shown in FIG. The insertion channel 12 is connected to the insertion opening 14 of the operating section 1 through the insertion section 2 . Then, the treatment instruments 15a, 15 are inserted through the insertion port 14.
b is inserted into the insertion channel 12, and the distal end thereof is projected outward from the distal opening 13. Furthermore, the direction in which the distal ends of the treatment instruments 15a, 15b protrude is regulated by a treatment instrument guide 16 installed within the distal end opening 13.

The treatment instrument guide 16 is provided as shown in FIG. That is, one end portion of the treatment instrument guide 16 is pivotally attached to a relatively bottom portion of the distal end opening 13 by a pivot shaft 17, so that it can rotate in the vertical direction. In addition, the treatment instrument inductor 1
The tip of the operating wire 18 is connected to the side wall portion of the rotating tip 6 . The proximal end of the operating wire 18 is guided to the operating section 1 through the insertion section 2,
It is connected to a raising operation mechanism provided in the operation section 1. And the operation knob 19 of this raising operation mechanism
By operating , the operating wire 18 is pushed or pulled, and the treatment instrument guide 16 is rotated. Furthermore, as shown in FIG. 3, the treatment instrument guide 16 has a first guide groove 21 and a second guide groove 22 formed on its proximal wall surface facing the insertion channel 12. The distal ends of the treatment instruments 15a, 15b protruding from the insertion channel 12 are guided by the grooves 21, 22 to the distal end opening 1.
3 and protrudes in a predetermined direction.
By the way, the first guide groove 21 is formed as a concave groove with a cross-sectional shape substantially corresponding to the outer diameter of the treatment instrument 15a, which has a larger outer diameter among the treatment instruments 15a and 15b used. . Further, the second guide groove 22 is formed inside the first guide groove 21 as a concave groove having an arcuate cross-sectional shape substantially corresponding to the outer diameter of the treatment tool 15b having a small diameter. Further, the second guide groove 22 is formed along the longitudinal direction of the first guide groove 21 over almost the entire length thereof and at the center thereof.

Next, the operation when the treatment instruments 15a, 15b are guided by the treatment instrument guide 16 in the above configuration will be explained.

First, insert the large diameter treatment instrument 15a into channel 1.
2, the distal end of the treatment instrument 15a is guided by the first guide groove 21 as shown in FIG. Then, by pulling the operating wire 18 toward the hand side and rotating the treatment instrument guide 16 to stand up, the distal end of the treatment instrument 15a is curved and erected, and the protruding direction of the distal end is positioned within the field of view of the observation window 9. can be done. Also, at this time, since the first guide groove 21 is guided by the two contact surfaces formed by the left and right wall portions separated by the second guide groove 22, it is placed between the two rails. It is in a suspended state and is guided with almost no wobbling.

On the other hand, when guiding the small-diameter treatment instrument 15b, it is guided so as to fit into the second guide groove 22, as shown in FIG. Since it is guided by the second guide groove 22 that fits in this way, it is guided without much wobbling.

FIG. 6 shows a modification of the treatment instrument guide 16. As shown in FIG. That is, the second guide groove 22 is formed so as to be inclined toward the center of the viewing window 9 with respect to the first guide groove 21 . In this way, even if the treatment instrument 15b has a small diameter, its tip can be guided toward the center of the field of view of the observation window 9.

FIG. 7 shows a further modification of the treatment instrument guide 16. That is, this causes the first guide groove 21 to be shifted toward the center of the observation window 9 in the viewing direction from the longitudinal center line of the first guide groove 21 (shifting amount l), and the first guide groove 2
A second guide groove 22 is partially provided on the distal end side of the guide groove 1. Further, by providing the second guide groove 22, the center portion of the tip of the first guide groove 21 adjacent to the second guide groove 22 forms a relatively protruding regulating portion 25. Therefore, in this configuration, the treatment tools 15a and 15b are first inserted into the first guide groove 2.
1, then enters the second guide groove 22, is guided thereby, and further exits toward the center of the field of view of the observation window 9 by the inclined surface of the regulating portion 25. In particular, in the case of a small-diameter treatment instrument 15b, a larger peripheral wall surface portion fits into the second guide groove 21, so that even a small-diameter treatment instrument 15b can be guided without wobbling.

Although each of the above embodiments has been described with reference to the case where the treatment tool guide is rotated, the present invention may be of a type in which the treatment tool guide is slid. Alternatively, the guide surface may have a three-stage structure in which a third guide groove is further formed within the second guide groove.

[Effect of idea]

As explained above, according to the present invention, even if treatment instruments with different outer diameters are used together, there is no wobbling on the treatment instrument guide, and each treatment instrument is reliably guided in a predetermined direction in a stable state. be able to.

[Brief explanation of drawings]

FIG. 1 is a perspective view of an endoscope according to an embodiment of the present invention;
FIG. 2 is a side sectional view of the distal end of the endoscope according to the embodiment, FIG. 3 is a perspective view of the treatment instrument guide in the endoscope according to the embodiment, and FIGS. 4 and 5 are respectively The plan view of the distal end portion of the endoscope in the used state, and FIGS. 6 and 7 are perspective views of different treatment instrument guides, respectively. 12... Insertion channel, 13... Tip opening, 15a, 15b... Treatment instrument, 16... Treatment instrument guide, 21... First guide groove, 22... Second guide groove.

Claims (1)

[Scope of utility model registration request] In an endoscope, a treatment instrument guide is provided in the distal end component of the endoscope, and the distal end of the treatment instrument guided through the insertion channel is guided by the treatment instrument guide and its protrusion direction is regulated, The treatment instrument guide includes a first guide groove for guiding the distal end of the treatment instrument, and a second guide groove formed within the first guide groove to be smaller than the first guide groove for other treatments having a diameter smaller than that of the treatment instrument. An endoscope characterized by being provided with a second guide groove for guiding an instrument.