JPH0340245Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an elevating device for a conducting device such as forceps for collecting living tissue from the inner wall of a biological cavity such as the stomach or duodenum, or a tube for pancreatic and cholangiography, and particularly relates to an observation window and a passage opening for the conducting device. An object of the present invention is to provide a lifting device for an endoscope conductor, which is capable of guiding the conductor toward the central region of the observation field in endoscopes arranged in parallel at the distal ends of the endoscopes.

When making a diagnosis using an endoscope, in addition to observing and diagnosing the diseased area within the body cavity, tissue diagnosis is performed using biopsy forceps for collecting biological tissue, or a contrast agent is applied into the lumen of the pancreaticobiliary duct using a pancreatic and cholangiography tube. In the case of an endoscope intended for diagnosis of internal organs through injection, as shown in Fig. 1, an observation window 2 and a conducting device 5 such as forceps or a contrast tube are taken out from the tip of the endoscope. There is an endoscope that has openings 4' arranged in a vertical line. In this type of endoscope, the conductor 5 is raised by the raising member 4 and introduced into the field of view of the observation window 2 to collect cells. As shown in the figure, since it moves on the center line of the observation field of view, the ability to target the observation area with the conductor 5 is good, but the structure of the endoscope tip is such that the observation window 2 and the passage of the conductor 5 are aligned in a line. By the way,
The hard part at the tip of the endoscope becomes longer, which not only causes pain to the patient when inserted into a body cavity, but also obstructs observation in narrow lumens such as the duodenal bulb during observation and diagnosis, making it difficult to observe thoroughly. It had the following drawbacks.
Therefore, by arranging the observation window 2 and the opening 4' of the passageway of the conductor 5 side by side and shortening the rigid tip, it is possible to reduce the pain of the patient and eliminate blind spots when observing inside the narrow lumen. Endoscopes became desirable.

However, in the case of an endoscope in which the observation window 2 and the passage opening 4' are installed side by side, the conductor 5 is projected parallel to the center line of the observation field as shown in the third figure. The problem is that the conducting tool 5 is biased to one side of the observation field, making it difficult to guide the conducting tool 5 to the central area of the visual field, and the ability of the biopsy tool (conducting tool) to target biological tissue collection etc. becomes poor. occurred.

In order to eliminate these shortcomings, Jikoko 53-1832
As with the idea described in the publication, the axis of the conductor and the swinging surface of the raising member intersect with the optical axis of the observation optical system, and the tip of the conductor is inserted into the center of the field of view. An endoscope was proposed, but according to this idea, since the optical axis of the observation optical system and the raising member of the conductor were tilted, a large amount of dead space was inevitably required for placement within the tip metal fitting, and the thickness was too large. In the hard part of the distal end, which is subject to restrictions, the guide tube for the conducting device becomes thin, and as a result, it is necessary to use thin conducting devices such as biopsy collection forceps or contrast tubes, which may be difficult to use for tissue diagnosis or contrast media. There was a problem with injection.

Separately, as a means for guiding the tip of the conductor, which is bent and protruded from the tip of the metal fitting by means of a raising member, into the observation field.
As shown in Publication No. 116001, a lifting member that moves up and down on a support axis perpendicular to the central optical axis of the observation window is used to guide the tip of the conductor into the observation field and bend it to protrude. It has also been proposed that a guide surface is formed with a gently curved inner surface to allow the conductor to move, but in this case, the tip of the conductor first acts on this guide surface and slides up on the guide surface. Then, it will protrude from the metal tip, and during the protrusion process, the conductor will come into contact with the arc-shaped ridge on the outer edge of the raising member at one point, so by the raising operation of the raising member. The contact point where the conductor comes into contact with the raising member is
It gradually slides along the arcuate edge of the outer edge of the raising member, and always touches the arcuate edge at a specific point (point R in the instructions in the same publication). It turned out that it was not always possible to maintain the condition. This sliding movement of the contact point along the arcuate edge, combined with the movement when operating the conductor with an unspecified bending tendency, causes the tip of the conductor to move to the desired affected area within the observation field. This made it difficult to operate the endoscope to direct the object. That is, in this proposed device, the point where the conductor comes into contact with the outer edge of the raising member slides on the arcuate edge of the raising member. Although it has the function of guiding the tip of the conductor into the observation field,
There were some issues regarding operability and inconvenience.

The big problem with this type of lifting device is that the lifting member with a limited width must be accommodated within the metal tip whose thickness is limited. is impossible, at most
To overcome the technical difficulty of having to protrude a conductor with a strong bending tendency by bending it in a predetermined direction under this dimensional restriction, which can only be made in a width of about 10 m/m. It was hot.

In the present invention, in view of the above-mentioned drawbacks and technical problems of the conventional example, the raising member 4 of the conductor 5 with respect to the observation window 2 is
The guide groove L that is inclined toward the observation window is formed on the raised surface of the raising member 4, and the conductor 5 that protrudes from the metal tip 1 is installed next to the observation window 2 without tilting the raised member 4. is guided directly by the guide groove L provided in the raising member 4, and in particular, at the outer end of the raising member 4, the protruding direction is restricted by holding the conductor 5 from the side surface thereof. , the conductor 5 effectively utilizes the space within the metal tip 1, increases the inner diameter of the guide tube of the conductor 5, guides the protruding conductor 5 closer to the central area of the observation field, and directs it to the target site within the organ. This is an improved version of 5 with improved operability.

The present invention will be explained with reference to the embodiments shown above.

FIG. 4 is a perspective view showing the tip part of the device of the present invention, in which 1 is a tip metal fitting, 2 is an observation window, 3 is an illumination window, 4 is a raising member, and 5 is a conductor. Referring to the sectional view of the main part in FIG. 5, which is also indicated by the same reference numerals, the observation window 2 and the opening 4' of the conductor are arranged side by side, and below the observation prism 2' there is an illumination fiber bundle 3'. is located. The raising surface of the raising member 4 and the optical axis of the observation window 2 are arranged parallel to each other. Furthermore, as shown in FIG. 6, the raising member 4 has a guide groove L for smoothly sliding up and protruding the conductor 5, and this guide groove L is inclined toward the observation window side.

FIG. 7 shows the state when the conductor 5 is raised by the raising member 4. The exit point B of the tip metal fitting 1 is the fulcrum, and the point A on the raising member 4 is the point of action. This figure shows the state in which the conductor 5 is raised. In this case, when the cross-section near point B is shown in FIG. The conductor 5 protruding from the metal fitting 1 faithfully protrudes in the direction of the guide groove L of the raising member 4.

The shape of the conductive path at point B of the tip metal fitting 1 is
If the fulcrum of the conductor 5 is modified as shown in the figure and the fulcrum of the conductor 5 is set to M', the inclination of the conductor becomes even greater, and in this type of endoscope where there is insufficient space in the tip metal fitting 1, the conductor 5 can be seen in the field of view. The effect directed toward the central area becomes even greater. In this case, the degree of inclination of the conductive path is determined by assuming a position where the direction of inclination of the guide groove L intersects with the center of the observation field.

Comparing and contrasting FIGS. 10 and 11 with respect to the arrangement of the raising member 4 with respect to the observation window 2 and the conductor 5, it is found that the conductor 5 and the raising member 4 are arranged in the observation window 2 as shown in FIG. It is clear that the conductor 5 can be provided thicker when it is arranged parallel to the optical axis than when it is arranged at an angle as shown in Figure 11.
The more the raising member 4 is tilted, the thinner the conductive tool 5 becomes. Therefore, when the raising member 4 is arranged parallel to the optical axis of the observation window 2 as shown in FIG. 10, the guide tube of the conductor 5 can be made thicker, and an effective arrangement can be obtained. The fact that the guide tube can be made thick is also very effective in that it is possible to aspirate internal secretions even when the conductor 5 is inserted, and that mucus adhering to the observation surface can be easily removed. In addition, when raising the conductor, exit B of the tip metal fitting 1
If the points are arranged in parallel as shown in FIG. 10, they can be positioned lower, and the amount of lifting force of the lifting member 4 can be reduced, which is advantageous in terms of operation.

According to the configuration of the present invention, the inner diameter of the conductor guide tube in the distal end fitting 1 of the endoscope can be arranged large, so that the conductor 5 inserted from the conductor inlet (not shown) on the hand operation section side is guided. Tip metal fitting 1 passing through the pipe
The conductor 5, which is guided smoothly up to the point where the conductor 5 is projected outside the metal tip 1 along the guide groove L of the raising member 4, is brought into the field of view of the observation window 2 by the raising operation of the raising member 4. However, since the guide groove L is inclined toward the central area of the observation field, operations such as biopsy or contrast agent injection operations performed in the central area of the visual field can be easily performed according to the protruding length of the conductor 5. I will do it.

In the above-mentioned protruding operation for the conduction tool 5, the raised member 4 moves up and down so as to surround approximately half of the outer peripheral surface of the conduction tool 5 in a half-moon shape.
In addition, the cross-sectional shape of the guide groove L is not made into a semicircle that matches the roundness of the outer periphery of the conductor 5,
Even if the conductor 5 is formed with a non-circular cross section, the protruding direction is regulated by contacting at least two distant points within the enclosing range of the conductor 5. Since it is controlled by and held by the cross-sectional shape of the guide groove L, it is not affected by the bending tendency inherent in the conductor 5, and even when external operations are applied to the conductor 5, the tip can be reliably kept within the observation field of view. It is expected that the endoscope will be easy to operate, since it can be brought into the field of view, and the tip can be positioned externally within the field of view and the tip can be accurately positioned at the desired affected area or area to be examined.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the distal end of a conventional endoscope, and FIG. 2 is a projection view of the conductor in the observation field from the hand operation section side in the conventional example shown in FIG. It is. Figure 3 is a sectional view of the distal end to explain the concept of the present invention, Figure 4 is a perspective view of the distal end of an endoscope equipped with the device of the present invention, and Figure 5 is a cross-sectional view of the tip of the endoscope equipped with the device of the present invention. FIG. 6 is a cross-sectional view of the main part of the distal end of the endoscope, and FIG. 7 is a diagram showing the guiding groove of the lifting member in the present invention. FIG. 8 and 9 are diagrams for explaining the relationship between the conduit path and the protruding state of the conduit, and FIGS. 10 and 11 are views for explaining the arrangement of the raising member and the protruding state of the conduit guide tube. It is a figure which contrasts and shows the relationship with thickness. 1... Tip hardware, 2... Observation window, 3... Illumination window, 4... Elevating member, 5... Conductive tool.

Claims (1)

[Claims for Utility Model Registration] (1) An opening 4' which is opened in the tip metal fitting 1 at the tip of the body cavity insertion part and allows the conduction tool 5 to protrude from the tip metal fitting 1 to the outside, and an opening 4' which is located side by side with this opening 4'. Observation window 2 attached and observation window 2 provided in opening 4'
A raising member 4 is rotatably supported by an axis perpendicular to a vertical plane including the central optical axis of the raising member 4, and a guide groove L inclined toward the observation window is provided on the raising surface of the raising member 4. The outer end of the guide groove L is connected to the conductor 5 by a surface surrounding approximately half of the outer peripheral surface of the conductor 5 or two distant points on this surrounding surface.
1. A lifting device for an endoscope conductor, characterized in that the device has a shape that supports the outer peripheral surface of the endoscope conductor. (2) The fulcrum B of the opening 4' with which the conduction tool 5 comes into contact is formed such that the fulcrum M of the conduction tool 5 is moved away from the observation window 2. Lifting device for the endoscope conductor.