JPH0443851Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a guide tool used when inserting the insertion section of an industrial endoscope into a specimen.

(Prior art) Recently, when inspecting the inside of a machine such as a jet engine, it has become possible to observe the inside of a machine as a specimen without disassembling it, thereby shortening work time and improving work efficiency. Due to these advantages, industrial endoscopes are widely used in various industrial fields.

In this type of general endoscope, a flexible insertion section extends from one end of the operation main body, and an eyepiece is provided at the other end of the operation main body. When in use, the insertion section of the endoscope is inserted into the specimen through the opening, and the interior is observed with the eyepiece through the observation optical system provided in the insertion section.

However, the inside of the specimen has a complicated shape,
If a constriction part is formed inside the specimen before reaching the examination site, if you try to insert the endoscope alone, the tip will sag due to its own weight because the insertion part is flexible. In some cases, the device could not be inserted into the desired test site.

Conventionally, in such cases, the insertion section of the endoscope is inserted into a guide tube that is harder than the insertion section, and the guide tube is passed through the constriction section in advance while the direction is determined by the insertion section. Thereafter, the insertion section was moved forward to protrude from the aperture section for observation. However, the outer diameter of the guide tube is larger than the insertion part, and the thicker part makes it difficult to insert the sample, resulting in poor workability. It was unusable.

Therefore, a guide channel is provided in the operation main body and the insertion section of the endoscope, and a long guide is protruded from the insertion port of the operation main body through the guide channel to the front of the distal end of the insertion section. The endoscope is guided by a hook that is hooked onto the diaphragm of the specimen, and then the insertion section of the endoscope is advanced along the guide. This type of guide includes, for example, a thin tube with a balloon attached to the tip as a hook. The balloon is deflated until the tip of the guide reaches the constriction inside the specimen, and when the tip reaches the constriction, water, air, etc. are injected into the balloon to inflate and hang it. In another example, the guide device is made of a spiral tube, and a hook is attached to the tip of the spiral tube as a hook, and the hook is hooked onto a constriction part inside the specimen. There is something.

(Problems to be Solved by the Invention) However, the conventional guide tools for the endoscope insertion section described above each have the following drawbacks.

In other words, in the case of a guide using a balloon,
There is a problem with the durability of the balloon, and the balloon may be damaged by sharp protrusions such as burrs formed inside the specimen, and as a result, the balloon cannot be inflated and the guide tool cannot be hung. In some cases, situations occurred where it became impossible to stop the operation.

In addition, in the case of a guide using a hook, the shape of the hook cannot be changed like a balloon before and after it is hooked to the constriction part, and therefore,
It was not possible to reliably hook the hook to the constriction part.

(Means for solving the problem) This invention was made to solve the above problem. A guide tool for an endoscope insertion section that protrudes forward and guides the insertion section by hooking onto a specimen includes a bendable exterior tube, an operating wire inserted through the exterior tube, and a proximal end of the exterior tube. A fixed wire fixed at the tip,
a rod-shaped hook having one end supported by the tip of the fixed wire and the other end supported by the tip of the operating wire, and a rod-shaped hook connected to the base of the operating wire and hooked to the base end of the sheathing tube. a stopper, and the length of the locking body, the movement stroke length of the stopper, and the length of the fixed wire from the tip of the sheathing tube to the support portion for the locking body are approximately the same dimension. The feature lies in the guide tool for the endoscope insertion section.

(Function) Since the length of the latch, the moving stroke length of the stopper, and the length of the fixed wire from the tip of the outer tube to the supporting part for the latch are approximately the same, the stopper is moved by the length of the stroke. When pulled apart from the outer tube, the outer tube and the hook become aligned. In this state, the guide tool is inserted through the guide channel of the endoscope, protruded from the insertion section, and inserted into a desired position inside the specimen.

Next, while stopping the armored tube, the stopper is pressed and moved until it latches on the proximal end of the armored tube, and the hook is disposed perpendicular to the extension line of the armored tube. Therefore, when the guide is pulled while the stopper is hooked to the proximal end of the outer tube, the hook will be reliably hooked at a desired position inside the specimen.

Furthermore, when the stopper is pulled while stopping the sheathing pipe, the hanging body arranged perpendicular to the extension line of the sheathing pipe becomes straight again, and the guide tool can be further advanced into the specimen or stored within the insertion section.

(Example) Hereinafter, an example of this invention will be described based on the drawings from FIG. 1 to FIG. 4.

In FIG. 1, reference numeral 1 denotes an endoscope, which is used for internal inspection of a jet engine 2 as a specimen. Jet engine 2 is 9
It has combustion chambers 3a to 3i each having a circular cross section, and the adjacent combustion chambers 3a to 3i are connected in a ring shape by connecting pipes 4a to 4i (throttled portions) each having a small cross section. Of the nine combustion chambers 3a to 3i, two combustion chambers 3a and 3g are provided with holes 30a and 30g for installing spark plugs, respectively. The flame generated in the combustion chambers 3a and 3g by this spark plug is transmitted to all combustion chambers 3a through connecting pipes 4a to 4i.
It's starting to turn around ~3i. Holes 30a, 30
g has its spark plug removed during internal inspection and is used for inserting the endoscope 1.

The endoscope 1 has an operating main body 5, an eyepiece section 6 is provided at one end of the operating main body 5, and a flexible insertion section 7 extends from the other end. A bending portion 7 is provided at the tip of the insertion portion 7 and is bent by remote control using the operation main body 5.
Further, a hard tip structure part 8 is formed at the tip of this curved part 7a, and an observation window and an illumination window (not shown) are provided on the end surface of the tip structure part 8. Further, an insertion port 9 is provided from the outer side of the operation main body 5 and projects at a predetermined angle with respect to the operation main body 5. Connected to the information channel. Furthermore, this guide channel is open at the end face of the tip component 8.

Further, reference numeral 10 is a guide tool, which is inserted into the guide channel from the insertion port 9 of the endoscope 1. The guide 10 has a helical tube 12 as an exterior tube into which a wire 11 is inserted, and a remote control section 15 is provided at the proximal end of the helical tube 12 as shown in FIG.
is provided. To explain in detail, the base end of the spiral tube 12 is a finger rest part 13. A rod 14 extends from the base side end surface 13a of the finger rest 13, and a guide hole 14a is formed in the rod 14 in the longitudinal direction, and a ring 16 is provided at the tip. Further, a stopper 17 is provided on the outside of this rod 14, and a pin 18 that is inserted through the guide hole 14 is fixed to the stopper 17.
One end of the wire 11 inserted through the spiral tube 12 and finger hook 13 is connected to this pin 18.

On the other hand, at the tip of the spiral tube 12, third and fourth
As shown in the figure, a notch 19 having a depth approximately the same as the diameter of the wire 11 is formed.

Further, the tip of the wire 11 protrudes from the tip of the spiral tube 12, and a cylindrical rod-shaped metal hook 20 is inserted through the tip.
It is fixed to the notch 19 of the spiral tube 12 by means such as welding or adhesive, and is also fixed to the inner circumferential surfaces 22a and 22b on both ends 20a and 20b of the hanging body 20 by welding or the like. In the one wire 11, from one end 20b of the hooking body 20 to the spiral tube 12
A fixed wire 11B extends to the fixed portion, and an operating wire 11A extends from the stopper 17 to the other end 20a of the hook 20. In addition, the fixed wire 11
One end 20 of the hanging body 20 from the distal end surface of the B spiral tube 12
The dimension up to b is approximately equal to the length of the hanging body 20.

Note that when the tip side end surface 17a of the stopper 17 is brought into contact with the base side end surface 13a of the finger rest 13 and placed in the position shown by the two-dot chain line in FIG. The length is the maximum, and the dimension from the tip end surface of the spiral tube 12 to the end surface of the other end 20a of the hanging body 20 is made to be approximately equal to the length of the hanging body 20. Therefore, in this state, as shown in FIG. 4, the protrusion of the operating wire 11A from the tip of the spiral tube 12, the hook 20, and the fixed wire 11B form a substantially equilateral triangle, and the spiral The extension line of the tube 12 and the hook 20 are perpendicular to each other.

Furthermore, when the stopper 17 is pulled toward the ring 16, the operating wire 11A is housed in the spiral tube 12, and the other end 20a of the hook 20 comes into contact with the tip of the spiral tube 12, causing the hook to close. 20 and the spiral tube 12 become straight. That is, the movement stroke length of the stopper 17 is set to be approximately the same as the length of the hook 20.

In the above configuration, the spiral tube 12 and the hook 20 of the guide tool 10 are arranged in a straight line as shown in FIG. It is inserted through the hole 30a of the combustion chamber 3a of the jet engine 2, and the inside of the first combustion chamber 3a is observed through the eyepiece 6 via the optical transmission system. At this time, since the tip of the guide tool 10 is housed within the guide channel, it does not interfere with internal observation.

Next, the second combustion chamber 3 adjacent to the first combustion chamber 3a
When observing b, it is necessary to pass the insertion section 7 through the connecting tube 4a. At this time, only the guide tool 10 is made to protrude forward from the tip forming part 8 while the curved part 7a of the insertion part 7 remains located in the first combustion chamber 3a.
Then, while confirming the position of the tip of the guide tool 10 with the eyepiece 6 of the endoscope 1, bend the bending part 7a to direct the guide tool 10 toward the connecting tube 4a, and then move the guide tool 10 further. It is made to protrude and be inserted into the connecting pipe 4a to enter the second combustion chamber 3b. At this time, the hanging body 20
Since it is in a straight line with the spiral tube 12, it can be smoothly inserted into the connecting tube 4a having a small opening area.

After inserting the tip of the guide tool 10 into the second combustion chamber 3b as described above, the finger hook part 1 of the guide tool 10 is inserted into the second combustion chamber 3b.
Hold 3 between your index and middle fingers, and press stopper 1.
Put your thumb on 7 and place the stopper 17 on the finger hook 13.
Push in the direction indicated by the two-dot chain line in Figure 2. Then, the operating wire 11A moves forward, causing its tip to protrude from the tip of the spiral tube 12, and as shown in FIG. 4, the operating wire 11A, the hook 20, and the fixed wire 11B form a substantially equilateral triangular shape.

Next, while keeping the stopper 17 hooked to the finger hook 13, lightly pull the guide tool 10.
Operation wire 11A protruding from the tip of spiral tube 12
Each base side of the fixed wire 11B is pulled back into the connecting pipe 4a, and both ends 20a, 20b of the hook 20 are hooked to the inner wall of the second combustion chamber 3b. The operating wire 11A and the fixed wire 11B are connected to the connecting pipe 4a.
In order to perform a guiding action while contacting the inner circumferential surface of the combustion chamber 3b, the tip of the spiral tube 12 is arranged on the central axis of the connecting tube 4a, and moreover, the tip of the spiral tube 12 is placed on the central axis of the connecting tube 4a, and is aligned with the extension line of the spiral tube 12 on the hook 20. Since the dimensions from the intersection to both ends 20a and 20b of the hook 20 are the same, the hook 20 can be reliably hooked to the inner wall of the second combustion chamber 3b.

Furthermore, when the guide tool 10 is pulled as described above, the stopper 17 is hooked to the finger hook 13 and there is no relative movement between the operating wire 11A and the helical tube 12. is the operation wire 11
It will not be stretched due to the reinforcement of A. or,
Since both the operating wire 11A and the spiral tube 12 are in a tensioned state, the tensile strength of the guide tool 10 is also extremely large.

Furthermore, the insertion section 7 of the endoscope 1 is inserted into the guide tool 21.
When the insertion portion 7 is moved forward along the helical tube 12 of the second combustion chamber 3b very smoothly and in a short time,
can be inserted into the

Next, with the insertion portion 7 positioned in the second combustion chamber 3b, the entire guide 10 is moved forward slightly, and then the stopper 17 is pinched between the index finger and the middle finger, and the thumb is inserted into the hole of the ring 16. 17 toward the ring 16, the operating wire 1
Move 1a back. Then, the operating wire 11A protruding from the tip of the helical tube 12 is pulled back into the helical tube 12, and as a result, the hooking body 20 and the helical tube 1
2 becomes a straight line as shown in FIG.

Then, the hook 20 is stored in the guide channel within the insertion section 7, and the endoscope 1 is used for internal inspection of the second combustion chamber 3b.

In this way, by sequentially repeating the above operations, each combustion chamber 3a to 3 of the jet engine 2 is
i can be checked within a very short time and easily.

In addition, since the operating wire 11A and the fixed wire 11B of the guide tool 10 are each fixed to the hook 20, in the unlikely event that the operating wire 11A or the fixed wire 1
Even if the guide 1B is damaged, all the components of the guide 10 can be taken out without being left in the jet engine 2.

In the embodiment described above, since the operating wire 11A and the fixed wire 11B are formed of one wire, it is sufficient to fix the wire 11 to any one of the hooks 20. Also, the operating wire 11A
and the fixed wire 11B may be formed of separate wires.

This invention is not limited to the above-mentioned embodiments, and various embodiments are possible. For example, the exterior tube is not limited to a spiral tube, but may be any tube that is bendable and has a certain degree of rigidity. Further, the hanging body is not limited to a cylindrical shape, but may be prismatic, and may be made of resin.

(Effects of the invention) As explained above, according to the guide tool for the endoscope insertion section of this invention, the latch body and the exterior tube are made straight so that the cross-sectional area of the tip of the guide tool is larger than that of the insertion section. Since it can be made small, even if there is a constriction part with a small opening area on the way to the observation site of the specimen, the tip of the guide tool that precedes the insertion part can be easily and reliably attached to the constriction part etc. Can be inserted. Furthermore, after the tip of the guide is inserted, the hook can be placed perpendicular to the extension line of the sheathing tube, and the dimensions from this intersection to both ends of the hook can be made approximately the same. The latching body is reliably latched inside the specimen and does not come off, and the insertion portion of the endoscope can be easily guided to the diaphragm portion or the like.

In addition, since the stopper is hooked to the proximal end of the sheathed tube to pull the guide, both the operating wire and the sheathed tube are in a tensioned state, which reduces the tensile strength of the guide. improves.

Furthermore, when observing the inside of a specimen with an endoscope, the tip of the guide can be stored within the insertion section of the endoscope, so the guide does not interfere with the observation.

Furthermore, the guide tool requires fewer components, has a simple structure, does not break down, has good operability, can shorten working time, and can be made at low cost.

[Brief explanation of the drawing]

The drawings from Fig. 1 to Fig. 4 show one embodiment of this invention, and Fig. 1 is a schematic view of how the guide tool of the endoscope insertion section is used, and Fig. 2 shows the base of the guide tool. Figure 3 is an enlarged cross-sectional view of the tip of the guide tool when the hook and spiral tube are in a straight line, and Figure 4 is an enlarged plan view when the hook is perpendicular to the extension line of the spiral tube. It is the same enlarged front view. 1... Endoscope, 2... Specimen, 5... Operation main body,
7... Insertion section, 9... Insertion port, 10... Guide tool,
11... Operating wire A, 11B... Fixed wire,
12... Exterior tube, 13... Proximal end (finger hook part) of the exterior tube, 17... Stopper, 19... Tip of the exterior tube,
20...Hatching body, 20a...Other end of hanging body, 20
b...One end of the hanging body.

Claims (1)

[Scope of utility model registration request] A bendable exterior for a guide tool for an endoscope insertion section that passes through the insertion port provided on the operating body of the endoscope and projects toward the front of the tip of the insertion section, hooks onto a specimen, and guides the insertion section. a tube, an operating wire inserted through the armored tube, a fixed wire having a proximal end fixed to the distal end of the armored tube, one end supported by the distal end of the fixed wire and the other end attached to the distal end of the operating wire. It includes a supported rod-shaped hook, and a stopper connected to the base of the operating wire and hooked to the base end of the sheathing tube, and the length of the hook and the movement stroke length of the stopper are A guide tool for an endoscope insertion section, characterized in that the length of the fixed wire from the distal end of the sheathing tube to the supporting part for the hanging body is approximately the same dimension.