JP3733019B2 - Endoscopic treatment tool - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an endoscope treatment tool having a flexible tube inserted into and removed from a treatment tool insertion channel of an endoscope.
[0002]
[Prior art]
The distal end of a contrast tube (cannula tube) or high-frequency incision tool (papillotome knife) that is inserted into the treatment instrument insertion channel of the duodenal fiberscope and inserted into the pancreaticobiliary duct protrudes from the endoscope. It is necessary to properly control the direction in a delicate direction suitable for pancreaticobiliary duct insertion.
[0003]
Therefore, conventionally, as described in, for example, Japanese Utility Model Publication No. 1-15362, etc., in the use state in which the flexible tube is inserted into the treatment instrument insertion channel of the endoscope, An arc-shaped bending rod is attached in advance to a portion located in the bending portion of the endoscope.
[0004]
As a result, the direction of the distal end portion of the flexible tube is regulated by the bent heel portion of the flexible tube being along the curve of the treatment instrument insertion channel in the bending portion of the endoscope.
[0005]
[Problems to be solved by the invention]
However, the arcuate bends attached to the flexible tube as described above are deformed while the flexible tube is passing from the entrance to the exit of the treatment instrument insertion channel, and the orientation is changed slowly. It often happens.
[0006]
As a result, the direction in which the distal end portion of the flexible tube protrudes from the endoscope at the time of endoscopy becomes gusseted from time to time and cannot be smoothly inserted into the pancreaticobiliary duct or the like.
[0007]
Then, this invention aims at providing the treatment tool for endoscopes which can make the front-end | tip part of the flexible tube penetrated to the treatment tool penetration channel of an endoscope project reliably in a desired direction. .
[0008]
[Means for Solving the Problems]
In order to achieve the above object, an endoscope treatment tool of the present invention is for an endoscope having a flexible tube that is inserted into and removed from a treatment tool insertion channel that is inserted and disposed in an insertion portion of the endoscope. The treatment tool is flat when the flexible tube is inserted into the treatment tool insertion channel and the cross-sectional shape of the portion of the flexible tube located in the bending portion formed at the distal end portion of the insertion portion is flattened. It is what I made.
[0009]
The flat cross-sectional shape of the flexible tube may be oval or oval.
The portion of the flexible tube that is located closer to the tip than the inside of the bending portion may be formed in a flat cross-sectional shape that is twisted from the portion that is located in the bending portion.
[0010]
Or the front-end | tip treatment member exposed to the outer surface of a flexible tube may be arrange | positioned in the part located near the front-end | tip from the inside of the curved part of a flexible tube.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a distal end portion of a cannula tube used for feeding a contrast medium into a pancreaticobiliary duct via a treatment instrument insertion channel of a duodenal fiberscope.
[0012]
The cannula tube is connected to a base of a flexible tube 1 having a diameter of about 2 mm and a length of about 2 m made of, for example, a tetrafluoroethylene resin tube or a polyethylene resin tube, and a contrast medium injection port (not shown) is connected. Configured.
[0013]
A core bar for preventing hip breakage is inserted and arranged as necessary. Further, the distal end of the flexible tube 1 is formed in a shape that is slightly narrowed in a tapered shape. Hereinafter, the flexible tube 1 is referred to as a cannula tube 1.
[0014]
FIG. 4 shows a distal end portion in a state where the cannula tube 1 is inserted into the treatment instrument insertion channel 11 of the duodenal fiberscope 10 and used.
The insertion portion 12 of the flexible tubular duodenal fiberscope 10 has an effective length of about 1.2 m, and the distal end portion thereof is remotely controlled from an operation portion (not shown) provided on the hand side. A bendable bending portion 13 is provided.
[0015]
The treatment instrument insertion channel 11 is inserted and arranged over the entire length in the insertion portion 12, and the exit portion of the treatment instrument insertion channel 11 is controlled to convert the protruding direction of the treatment instruments protruding through the treatment instrument insertion channel 11 to the front-rear direction. The treatment tool raising piece 14 for this is arranged.
[0016]
When the cannula tube 1 is inserted into the pancreaticobiliary duct, the bending portion 13 is bent in a predetermined direction (so-called UP direction) as shown in FIG. It protrudes in the state bent in substantially the same direction as the bending direction.
[0017]
Returning to FIG. 1, the cross-sectional shape in the cross section perpendicular to the axis of the cannula tube 1 is a circular shape in the range from the proximal end to the vicinity of the distal end, but is inserted into the treatment instrument insertion channel 11 of the duodenal fiberscope 10. In the use state, the entire range of the portion A located in the bending portion 13 (hereinafter referred to as “portion A located in the bending portion 13”) and the range B closer to the tip are formed in a flat shape.
[0018]
That is, as shown in FIG. 2 illustrating the II-II cross section, in the above ranges A and B, the cannula tube 1 having a perfectly circular cross section is crushed from the side so as to have an elliptical shape or an oval shape. (Flat part 2).
[0019]
With such a configuration, as schematically shown in FIG. 3, the distal end portion of the cannula tube 1 has a bending direction that is easy to bend only in one direction with the flat portion 2 as the inner and outer surfaces from a straight state.
[0020]
Therefore, the direction of the cannula tube 1 is naturally regulated in a predetermined direction by passing the portion where the cannula tube 1 is located in the curved portion 13 of the treatment instrument insertion channel 11, and the distal end portion of the cannula tube 1 is inserted into the treatment instrument. The channel 11 can be reliably projected in the desired direction from the tip.
[0021]
FIG. 5 shows the distal end portion of the cannula tube of the second embodiment of the present invention, in which the flat portion 2 is formed parallel to the axis of the cannula tube 1 in the portion A located in the curved portion 13. The portion B closer to the tip is formed into a flat cross-sectional shape that is gradually twisted from the portion located in the bending portion 13.
[0022]
With this configuration, when the tip of the cannula tube 1 is bent, as shown in FIG. 6, the portion B closer to the tip than the portion A located in the bending portion 13 is a portion located in the bending portion 13. Turn on a plane different from A.
[0023]
Therefore, by appropriately selecting the twisted shape of the flat part 2, the tip of the cannula tube 1 can be projected from the tip of the insertion part 12 of the duodenal fiberscope 10 in the expected direction.
[0024]
FIG. 7 shows a tip portion of a papillotome knife to which the present invention is applied, and an electrode wire is attached to the tip portion of the flexible tube 1 in which the flat portion 2 similar to the first embodiment is formed. 3 (tip treatment member) is exposed and arranged.
[0025]
This electrode wire 3 is formed between a pair of holes in which a conductive wire inserted through the entire length of the flexible tube 1 is drilled at a distal end portion of the flexible tube 1 with an interval in the axial direction. It is arrange | positioned in the state which comes out on the outer surface of the flexible tube 1. FIG.
[0026]
If the electrode wire 3 is arranged on the flat surface of the flexible tube 1 as shown in FIG. 8 illustrating a VIII-VIII cross section, the inside of the curve of the flexible tube 1 protruding from the duodenal fiberscope 10 The electrode wire 3 can be positioned on the surface.
[0027]
As described above, the position of the electrode wire 3 with respect to the curve of the flexible tube 1 is set to the desired position by the position of the flat portion 2 and the electrode wire 3, and the electrode wire 3 is positioned in the desired direction. be able to.
[0028]
In addition, this invention is not limited to the said Example, It can apply widely to the various treatment tools inserted in the treatment tool penetration channel of an endoscope.
[0029]
【The invention's effect】
According to the endoscope treatment tool of the present invention, in a use state in which the flexible tube is inserted into the treatment tool insertion channel, the cross-sectional shape of the portion of the flexible tube located in the bending portion of the endoscope By flattening, the distal end portion of the flexible tube inserted through the treatment instrument insertion channel of the endoscope can be reliably projected in a desired direction.
[Brief description of the drawings]
FIG. 1 is a side view of a distal end portion of an endoscope treatment tool according to a first embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along the line II-II in FIG. 1 of the treatment instrument for endoscope according to the first embodiment of the present invention.
FIG. 3 is a partial perspective view showing a state in which a distal end portion of the endoscope treatment tool according to the first embodiment of the present invention is bent.
FIG. 4 is a side view of a use state in which a distal end portion of the endoscope treatment tool according to the first embodiment of the present invention is inserted for an endoscope.
FIG. 5 is a partial perspective view showing a state where the distal end portion of the endoscope treatment tool according to the second embodiment of the present invention is bent.
FIG. 6 is a schematic view showing a state where the distal end portion of the endoscope treatment tool according to the second embodiment of the present invention is bent.
FIG. 7 is a side view of a distal end portion of an endoscope treatment tool according to a third embodiment of the present invention.
8 is a cross-sectional view taken along the line VIII-VIII in FIG. 7 of an endoscope treatment tool according to a third embodiment of the present invention.
[Explanation of symbols]
1 Flexible tube (cannula tube)
2 Flat part 3 Electrode wire 10 Duodenal fiberscope 11 Treatment instrument insertion channel 12 Insertion part 13 Bending part A Position in the bending part B Part closer to the tip than in the bending part

Claims (2)

A treatment instrument for an endoscope having a flexible tube inserted into and removed from a treatment instrument insertion channel inserted and disposed in an insertion portion of an endoscope,
The cross-sectional shape of the flexible tube portion located in the curved portion formed to be freely bent by remote control at the tip portion of the insertion portion when the flexible tube is inserted through the treatment instrument insertion channel And forming a flat shape without twisting parallel to the axis of the flexible tube ,
The endoscope is characterized in that the cross-sectional shape of the flexible tube in the portion located closer to the tip than in the curved portion is formed into a flat shape twisted around the axis from the portion located in the curved portion . Treatment tool. The endoscopic treatment tool according to claim 1, wherein the flexible tube has a flat cross-sectional shape that is elliptical or oval.

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