JP3635536B2 - Endoscope - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an endoscope provided with an insertion portion having a conduit through which a stylet can be inserted and removed.
[0002]
[Prior art and problems to be solved by the invention]
2. Description of the Related Art Conventionally, an endoscope in which a stylet can be inserted into and removed from a pipe line of an insertion unit is known.
[0003]
According to the present invention, in this type of endoscope, the stylet can be used without damaging other built-in objects or obstructing the bending performance when the stylet is inserted, and the tip of the stylet is positioned. An object of the present invention is to provide an endoscope capable of reducing the diameter of a previous pipe line portion.
[0004]
[Means for Solving the Problems]
The present invention includes an insertion portion having a flexible portion, and a pipe line opened at the tip of the insertion portion, and an endoscope in which a stylet for hardening the soft portion can be inserted and removed on the proximal side of the pipe line In the mirror
Position restricting means is provided to prevent the stylet from entering a predetermined position in the pipe line, and when the stylet is inserted, the pipe line part positioned on the tip side from the tip of the stylet is placed on the proximal side. The diameter is smaller than that of the pipe line portion.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment)
An endoscope 1 according to a first embodiment of the present invention will be described with reference to FIG. The endoscope 1 is mainly composed of an insertion portion 2, an operation portion 3, and a universal cord (not shown). The said insertion part 2 has the front-end | tip part 6, the curved part 7, and the soft part 8, and these are arrange | positioned in that order from the front-end | tip, and are connected sequentially. Although not shown in the drawing, the tip of the tip 6 is provided with an observation window incorporating an objective lens, an illumination window, a channel opening, a nozzle facing the observation window, and the like.
[0006]
The endoscope 1 is configured to insert a stylet (flexibility adjusting tool) using a treatment instrument insertion channel 75 that also serves as a suction channel. That is, the treatment instrument insertion channel 75 is formed of a tube material disposed from the insertion portion 2 to the operation portion 3, and the treatment instrument insertion channel 75 has a thin distal end portion and a proximal portion. A boundary portion 77 where the distal-side small-diameter portion 75a is changed to the proximal-side large-diameter portion 75b is a protection fitted on the distal-side portion of the built-in object 12 disposed in the insertion portion 2 as shown in FIG. The tube (cylindrical body) 13 is disposed closer to the proximal side than the rear end. As shown in FIG. 1A, the distal end portion of the treatment instrument insertion channel 75 has a small diameter, and the proximal portion has a large diameter.
[0007]
The stylet 76 is restricted so that its tip is not inserted before the boundary portion 77. As a position restricting means for preventing the stylet 76 from entering a predetermined position in the pipe in this way, an operation ring 76a attached to the proximal end of the stylet 76 is an entrance 78 of the channel 75. Is set so that the tip of the stylet 76 is not inserted before the boundary portion 77. Therefore, even if the stylet 76 is inserted deeply, the tip of the stylet 76 is not inserted beyond the boundary portion 77 of the channel 75. For this reason, the treatment instrument insertion channel tube can be made thinner by the diameter of the channel 75 in the curved portion 7 which is densely packed in the built-in object 12 and located on the distal end side. . Further, the stylet 76 is inserted into the curved portion 7 which is densely packed with built-in objects, and the built-in 76 does not damage other built-in objects or impede the bending performance.
[0008]
As a built-in object disposed in the insertion portion 2, a light guide fiber bundle connected to the illumination window, an imaging signal line connected to an imaging device, an air / water feeding tube connected to the nozzle, There are guide tubes for bending operation wires.
[0009]
The member constituting the boundary portion 77 is formed of a material that is not easily damaged even if the tip of the stylet 76 hits the member. Further, the entire treatment instrument insertion channel 75 may be formed from an integral tube, or in this case, the treatment instrument insertion channel 75 may be formed by a heat-shrinkable tube and only the small-diameter portion 75a on the distal end side may be heat-shrinked. Also good.
[0010]
FIG. 1B shows the relationship between the inner diameter 79 of the small diameter portion 75a, the inner diameter 80 of the large diameter portion 75b, and the cross-sectional area of the stylet 76 in the treatment instrument insertion channel 75. The value obtained by subtracting the cross-sectional area of the small-diameter portion 75a from the cross-sectional area of the large-diameter portion 75b is equal to or less than the cross-sectional area of the stylet 76. The endoscope 1 may be a large intestine endoscope.
[0011]
(Second Embodiment)
An endoscope 1 according to a second embodiment of the present invention will be described with reference to FIG. In this, a treatment instrument insertion channel 81 is provided in the endoscope 1, but a stylet channel 82 for inserting a different stylet (flexibility adjustment tool) is provided independently. It is. The stylet channel 82 is formed such that the tip end portion is thin and the proximal portion is thick. The boundary portion 83 where the small diameter portion 82a changes to the large diameter portion 82b is located closer to the proximal side than the rear end of the protective tube (cylinder) fitted to the built-in object, and closer to the proximal side than the rear end of the curved portion 7. That is, it is located in the soft part 8. The distal end of the stylet 76 may be inserted beyond the boundary portion 83, but the length of the stylet 76 abuts against the boundary portion 83, or the hand ring 76 a of the stylet 76 hits the entrance 78 of the channel 82. By setting, the final insertion position of the stylet 76 is regulated so that the tip of the stylet 76 is not inserted before the boundary portion 83. Further, the stylet channel 82 can be used to supply water. The stylet channel 82 functions as a jet nozzle because the tip side is narrow.
[0012]
According to the present embodiment, even if the stylet channel 82 for inserting a stylet (flexibility adjustment tool) different from the treatment instrument insertion channel is provided in the endoscope, the distal end side is thin. The problem of increasing the diameter can be avoided.
As shown in FIG. 2, the treatment instrument insertion channel 81 may have a small diameter on the distal end side and a large diameter on the proximal side, as in the first embodiment described above.
[0013]
Further, the present invention is not limited to the above-described embodiments, and various modifications can be considered without departing from the gist of the present invention. Further, the scope of the endoscope is applicable not only to the lower digestive tract but also to the upper digestive tract, etc., which is used for a part having a lumen.
[0014]
(Appendix)
Appendix 1. In an endoscope comprising an insertion part having a soft part and a pipe line opened at the distal end of the insertion part, and a stylet that hardens the soft part can be inserted and removed on the proximal side of the pipe line,
Position restricting means for preventing the stylet from entering a predetermined position in the pipe is provided, and the diameter of the pipe on the tip side from the stylet tip is reduced when the stylet is inserted. Things to do.
[0015]
Appendix 2. In Supplementary Note 1, the predetermined position is located closer to the proximal side than the bending portion.
[0016]
Appendix 3. In Supplementary Note 2, the predetermined position is located closer to the proximal side than the proximal end of the protective cylinder that protects the built-in object in the bending portion.
[0017]
Appendix 4. In Supplementary Note 1, the conduit is a suction conduit, and the area obtained by subtracting the cross-sectional area of the outer diameter of the stylet from the cross-sectional area of the internal diameter of the large-diameter portion is greater than or equal to the cross-sectional area of the internal diameter of the small-diameter portion. thing.
[0018]
Appendix 5. In Appendix 1, the inner diameter of the narrow diameter part is thinner than the outer diameter of the stylet tip.
[0019]
Appendix 6. In Supplementary Note 1, the conduit is a conduit different from the suction conduit.
[0020]
Appendix 7. In Supplementary Note 1, combined with the claim A group.
[0021]
【The invention's effect】
As described above, according to the present invention, since the stylet is provided with position restricting means for preventing the stylet from entering beyond a predetermined position in the pipe line in which the stylet is inserted, other built-in items are inserted when the stylet is inserted. It is possible to reduce the diameter of the pipe part ahead of the position where the stylet tip is located, and increase the diameter of the pipe line into which the stylet is inserted. It can be avoided.
[Brief description of the drawings]
FIG. 1A is an explanatory diagram of an endoscope according to a first embodiment of the present invention, and FIG. 1B is an explanatory diagram of a treatment instrument insertion channel of the endoscope.
FIG. 2 is an explanatory diagram of an endoscope according to a second embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Endoscope, 2 ... Insertion part, 3 ... Operation part, 6 ... Tip part, 7 ... Bending part, 8 ... Soft part,
12 ... Built-in object, 13 ... Protective tube, 75 ... Channel for treatment instrument insertion, 76 ... Stylet.

Claims (1)

In an endoscope comprising an insertion part having a soft part and a pipe line opened at the distal end of the insertion part, and a stylet for hardening the soft part can be inserted and removed on the proximal side of the pipe line,
Position restricting means for preventing the stylet from entering a predetermined position in the pipe is provided, and when the stylet is inserted, the pipe portion located on the distal side from the tip of the stylet is connected to the proximal pipe. An endoscope characterized in that it is formed with a diameter smaller than that of the road portion.

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