JPS62281918A - Endoscope - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to an endoscope in which the curved state of the curved portion of the endoscope is improved.

[Prior art]

Traditionally, endoscopes were used to observe the necessary areas within body cavities.

Observation window to enable treatment etc.

A curved section is provided between the flexible tube and the distal end section provided with an illumination window, forceps port, etc., and this curved section can be operated by an operating section outside the body cavity attached to the flexible tube. This curved portion rotatably connects a plurality of nodal rings, and wire guides through which operating wires are inserted through these nodal rings are provided at equal distances outward in the radial direction from the axis of the nodal rings, and the operating wires are inserted into the bending portion. The bending section was designed to be curved by operating the operating section. However, when a bending section having such a configuration is operated to bend, the bending starts from a portion of the bending section near the flexible tube, and the portion near the tip tends not to bend easily.

Therefore, when performing a bending operation with such an endoscope, the tip portion progresses while drawing a large arc using the part close to the flexible tube as a fulcrum. When I tried to bend it, the tip hit the wall of the body cavity in the narrow part of the body cavity, making it impossible to bend.

Therefore, in the device shown in Japanese Utility Model Publication No. 60-41206, a mounting plate 2 is provided along the entire radial length of each node ring 1 as shown in FIG. They are provided so as to be located successively radially outward toward the tip of the section. By operating the operating wire 4 inserted through this wire guide 3, a larger rotational moment is generated in the nodal ring on the tip side of the curved part than in the other nodal rings, and this bending part is moved from the tip with a small radius of curvature. It was made so that it could be bent.

[Problem that the invention seeks to solve]

However, if the mounting plate 2 along the entire radial length is provided on the node ring 1 as in Japanese Utility Model Publication No. 60-41206, the node ring 1
4. Push the operating wire through. It is very difficult to arrange fiber bundles for observation and illumination, various tubes, etc., resulting in a low filling rate. Another problem is that the structure of the nodal ring becomes complicated.

The present invention was made by focusing on these problems.
The purpose is to be able to increase the filling rate with a simple structure, and also to be able to determine the part that begins to curve first.

[Means for solving problems]

When operating the operating wire, first set the wire guide at the farthest position from the joint between the joints of the joint at the position where you want it to start bending, and as the joint becomes farther away from the position where it starts to bend, Wire guides were gradually installed at positions closer to the connecting parts.

[For production]

When the operating wire is operated, a large rotational moment is generated in the node ring provided at the farthest position from the connecting portion of the wire guide and begins to curve.

〔Example〕

1 to 4 show a first embodiment of the present invention. As shown in FIG. 2, an operating section 12 is provided at the rear end of the flexible tube 11 of the endoscope 10, and a distal end section 14 is provided at the distal end via a curved section 13. The curved portion 13 is the first
As shown in the figure, a plurality of joint rings 15 are arranged in parallel, and connecting portions 16 protruding from both end surfaces of these peripheral walls are connected to a connecting shaft 17.
They are rotatably connected by ・−・−. The most advanced node ring 15 is connected and fixed to the tip portion 14, and the rearmost node ring 15 is connected and fixed to the tip of the flexible tube 11. Node ring 15 above
The end face of the node ring 15 has a tapered cane or arc shape in which the height of the peripheral wall decreases outward from the radial center, and each node ring 15 is spaced between the end faces of adjacent node rings 15. - forms a gap that can rotate within a certain rotation. Also,
A pair of hollow wire guides 18 are provided on the inner peripheral surface of each node ring 15.
They are located 180 degrees apart from each other.

That is, the wire guide 1 is provided farthest from the connecting shaft 17 as shown in FIG. FIG. 3(b) as you go to the rear end of section 13.
As shown in (C), it is provided at a position close to the connecting shaft 17. The upper and lower parts of the wire guides 18...- shown in FIG. 1 are provided with flexible tubes 1, respectively.
A first operating wire 20a and a second operating wire 20b are inserted through the operating section 12 and connected to the bending operating mechanism 19 within the operating section 12.
is inserted. The ends of these operating wires 20a, 20b are fixed to the wire guide 1 provided at the most advanced node ring 15 of the curved portion 13 by brazing or the like.

Next, the effect of the above configuration will be explained.

When inserting the endoscope 10 into a body cavity or observing or treating an affected area, the operation wires 20a, 20b are operated by operating the bending operation mechanism 19 provided on the operation section 12.
is moved to curve the bending portion 13 and direct the tip portion 14 in a desired direction. At this time, since the position of the wire guide 18 in the most advanced node ring 15 is farthest from the connecting shaft 17, when the operating wire 2Qa or 2 (lb) is pulled, the tip side node ring 15 receives a large rotational moment. Therefore, as shown in FIG. 4, the curved portion 13 begins to curve from the nodal ring adjacent to the distal end portion 14, and then the rear side gradually curves.

As described above, since it has a simple structure and curves sequentially from the distal end, it can be easily curved even in narrow parts of the body cavity without damaging the body cavity wall. Further, since no component is provided inside the node ring, the arrangement of fiber bundles and chains can be simplified and the filling rate can be increased.

5 and 6 are diagrams showing a second embodiment of the present invention6
Incidentally, the same parts as in the first embodiment are given the same reference numerals, and the details are omitted.

In this embodiment, the position of the wire guide 18 through which the first operating wire 20a is inserted is farthest from the connecting shaft 17 at the node ring 15 at the rear end, and as it goes toward the tip, the position of the wire guide 18 is farthest from the connecting shaft 17.
It is located close to.

Further, the wire guide 18 through which the second operating wire 20b is inserted is provided in the same manner as in the first embodiment.

Therefore, when the second operating wire 20b is pulled, it curves from the node ring adjacent to the distal end portion 14, but when the first operating wire 20a is pulled, it curves from the node ring at the rear end, as shown in FIG. In other words, the state of curvature can be selected depending on the insertion site.

In addition, since it can be curved from the rear end, the distal end 14
The displacement can be increased from the beginning.

FIG. 7 is a diagram showing a third embodiment of the present invention, and the positions of the wire guides 18 through which the first and second operating wires 2Qa, 20b pass are different from those of the previous embodiments. That is, in this embodiment, the wire guide 18 is provided at the node ring 15 at the center of the curved portion 13 farthest from the connecting shaft 17, and closer to the connecting shaft 17 toward the leading end and the rear end. Therefore, when the operation wires 2Qa, 20b are operated, the bending portion 13 starts to curve from the center.

〔Effect of the invention〕

As described above, in the present invention, the wire guides are positioned sequentially from the farthest position from the joint axis of the joint ring to the joint shaft (thereby, the position of the wire guide is shifted from the joint ring provided at the farthest position from the joint shaft). By setting various positions of the node rings in the curved section, the position at which the curved section starts to curve can be determined.

In addition, it is possible to achieve a high filling rate with a simple structure.

[Brief explanation of drawings]

FIG. 1 is a partial sectional view of the tip showing the first embodiment of the present invention;
Figure 2 is an overall view of the same embodiment, Figure 3 (a), (bl,
tc+ is AA, BB, CC sectional view of the same example,
FIG. 4 is a diagram showing the same embodiment in a curved state, FIG. 5 is a partial sectional view of the tip of the second embodiment, FIG. 6 is a diagram showing the same embodiment in a curved state, and FIG. The figure is a partial sectional view of the tip of the third embodiment, and FIG. 8 is a diagram showing the prior art. 10-... Endoscope, 11-... Flexible tube, 12-...-
Operation section. 13--...Curved part, 14--Tip part, 15...-
- Nodal ring. 16----・Connecting part, 17--・Connection shaft, 18--・-
-Wire guide. 19--One bending operation mechanism, 20a...-First operation wire. 20b --- Second operating wire (a) (b) (c)
Flute 3 Figure 4 Figure 5 Nu

Claims (1)

[Claims] A plurality of nodal rings are rotatably connected by a connecting shaft to form a curved portion, a bending operation wire is inserted into a wire guide provided in each of the nodal rings, and the bending operation wire is operated to form a bending portion. An endoscope having a curved endoscope, characterized in that the wire guides provided in each of the node rings are sequentially provided from a position farthest from the connecting shaft to a position closer to the connecting shaft.