JP2002136593A - Treatment tool for endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a treatment tool for an endoscope which is capable of reliably projecting the end of a flexible tube inserted into a treatment tool putting-through channel of an endoscope in a desired direction. SOLUTION: On the flexible tube 1, a part (A) positioned in a curved part 13 of the endoscope is made to be flat. The flexible tube may have a flat cross- section of an elliptical or an oval shape, and a part positioned closer to the end than a part in the curved part of the flexible tube may be formed so as to be twisted. A cannula is constructed in such a way that, for example, an injection cap of a contrast medium, not shown in the figure, is connected to an base end of a flexible tube made of a tetrafluoroethylen resin or polyethylene resin, etc., and having a diameter of about 2 mm and a length of about 2 m.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a treatment tool for an endoscope having a flexible tube inserted into and removed from a treatment tool insertion channel of an endoscope.

[0002]

2. Description of the Related Art A contrast tube (cannula tube) or a high-frequency incision device (papillotome knife) which is inserted into a treatment instrument insertion channel of a duodenal fiberscope and whose tip is inserted into a pancreatic bile duct, has a tip portion inside. It is necessary to properly control the direction of projection from the endoscope to a delicate direction suitable for pancreaticobiliary insertion.

[0003] Conventionally, for example, Japanese Utility Model 1-1536
As described in Japanese Unexamined Patent Application Publication No. 2000-205, a portion of the flexible tube located in the curved portion of the endoscope when the flexible tube is inserted into the treatment instrument insertion channel of the endoscope. Has an arc-shaped bending habit in advance.

[0004] As a result, the bending tendency of the flexible tube follows the curve of the treatment instrument insertion channel in the curved portion of the endoscope, so that the directionality of the distal end portion of the flexible tube is regulated.

[0005]

However, the arc-shaped bending habit attached to the flexible tube as described above is deformed while the flexible tube passes from the entrance to the exit of the treatment instrument insertion channel. There are many cases where the direction changes or becomes gentle.

[0006] In this case, the direction in which the distal end portion of the flexible tube protrudes from the endoscope at the time of an endoscopic examination becomes gusset every time, and it becomes impossible to smoothly insert the flexible tube into a pancreatic bile duct or the like.

Accordingly, the present invention provides a treatment tool for an endoscope that can reliably project a distal end portion of a flexible tube inserted into a treatment tool insertion channel of an endoscope in a desired direction. Aim.

[0008]

Means for Solving the Problems In order to achieve the above object, a treatment tool for an endoscope of the present invention can be inserted into and removed from a treatment tool insertion channel inserted through an insertion portion of the endoscope. An endoscope treatment tool having a flexible tube, wherein in a use state in which the flexible tube is inserted into a treatment instrument insertion channel, a bending portion formed at a distal end portion of an insertion portion of the flexible tube. Are flattened in cross section.

The flat cross section of the flexible tube may be elliptical or oval. The portion of the flexible tube located closer to the distal end than the inside of the curved portion may be formed to have a flat cross-sectional shape that is twisted from the portion located inside the curved portion.

[0010] Alternatively, a distal treatment member exposed on the outer surface of the flexible tube may be arranged at a position closer to the distal end than inside the curved portion of the flexible tube.

[0011]

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 pancreatic bile duct via a treatment instrument insertion channel of a duodenal fiberscope.

A cannula tube is provided at the base end of a flexible tube 1 made of, for example, a tetrafluoroethylene resin tube or a polyethylene resin tube having a diameter of about 2 mm and a length of about 2 m. Are connected and configured.

In addition, a core metal for preventing hip breakage is inserted and arranged as needed. The distal end of the flexible tube 1 is formed in a slightly tapered shape. Hereinafter, the flexible tube 1 is referred to as a cannula tube 1.

FIG. 4 shows a distal end portion of the duodenal fiberscope 10 in a state where the cannula tube 1 is used by being inserted into the treatment instrument insertion channel 11. The insertion section 12 of the flexible tubular duodenal fiberscope 10 has an effective length of about 1.2 m, and its distal end portion is remote-controlled from an operation section (not shown) provided on the hand side. A bendable bending portion 13 is provided.

The treatment tool insertion channel 11 has an insertion portion 12
The treatment instrument raising piece 14 for controlling the direction of projection of the treatment tools projected through the treatment instrument insertion channel 11 in the front-rear direction is disposed at the outlet portion thereof. Have been.

When the cannula tube 1 is inserted into the pancreatic bile duct, the bending portion 13 is bent in a predetermined direction (so-called UP direction) as shown in FIG. It protrudes in a state where it is bent substantially in the same direction as the bending direction of the portion 13.

Returning to FIG. 1, the cross-sectional shape of the cross section perpendicular to the axis of the cannula tube 1 is a regular circle from the base end to the vicinity of the distal end. The entire range of the portion A located in the curved portion 13 (hereinafter, referred to as “the portion A located in the curved portion 13”) and the range B closer to the tip thereof in the use state inserted into the curved portion 13 are formed flat. .

That is, as shown in FIG. 2 showing the II-II cross section, in the above ranges A and B, the cannula tube 1 having a perfect circular cross section is crushed from the side to form an elliptical or long shape. It is formed in a flat shape such as a circular shape (flat portion 2).

With such a configuration, as schematically shown in FIG. 3, the distal end of the cannula tube 1 is
It 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 the straight state.

Therefore, when the cannula tube 1 passes through the portion of the treatment instrument insertion channel 11 located inside the curved portion 13, the direction of the cannula tube 1 is naturally regulated in a predetermined direction, and the distal end portion of the cannula tube 1 is moved. The distal end of the treatment instrument insertion channel 11 can be reliably projected in a desired direction.

FIG. 5 shows a distal end portion of a cannula tube according to a second embodiment of the present invention. A flat portion 2 is formed parallel to the axis of the cannula tube 1 at a portion A located in a curved portion 13. Then, in the part B closer to the tip,
It is formed in a flat cross-sectional shape that is gradually twisted from a portion located inside the curved portion 13.

With this configuration, when the distal end of the cannula tube 1 is bent, as shown in FIG.
A portion B closer to the tip than a portion A located in the curved portion 13
However, it bends on a plane different from the part A located in the curved portion 13.

Therefore, the tip of the cannula tube 1 can be projected from the tip of the insertion portion 12 of the duodenal fiberscope 10 in the desired direction by appropriately selecting the twisted shape of the flat portion 2.

FIG. 7 shows a distal end portion of a papillotome knife to which the present invention is applied. The distal end portion of a flexible tube 1 having a flat portion 2 similar to that of the first embodiment is formed at the distal end portion. The electrode wire 3 (tip treatment member) is arranged so as to be exposed.

The electrode wire 3 is formed by a conductive wire inserted through the entire length of the flexible tube 1 and having a pair of holes formed in the distal end portion of the flexible tube 1 at intervals in the axial direction. It is arranged so as to protrude to the outer surface of the flexible tube 1 between them.

As shown in FIG. 8 showing a cross section taken along the line VIII-VIII, if the electrode wire 3 is arranged on the flat surface of the flexible tube 1, the flexible tube 1 protruding from the duodenal fiberscope 10 can be moved. The electrode wire 3 can be located inside the curve.

As described above, the position of the electrode wire 3 with respect to the curve of the flexible tube 1 is set as expected by the positional relationship between the flat portion 2 and the electrode wire 3, and the electrode wire 3 is moved in the desired direction. Can be located.

The present invention is not limited to the above embodiment, but can be widely applied to various treatment tools inserted into the treatment tool insertion channel of the endoscope.

[0029]

According to the endoscope treatment instrument of the present invention, when the flexible tube is inserted into the treatment instrument insertion channel, the flexible tube is positioned within the curved portion of the endoscope. By making the cross-sectional shape of the part to be flat,
The distal end portion of the flexible tube inserted into 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 a treatment tool for an endoscope according to a first embodiment of the present invention.

FIG. 2 is a view of a treatment tool for an endoscope according to a first embodiment of the present invention;
FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a partial perspective view showing a state in which a distal end portion of the treatment tool for an endoscope 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 treatment tool for an endoscope according to the first embodiment of the present invention is inserted for an endoscope.

FIG. 5 is a partial perspective view of an endoscope treatment tool according to a second embodiment of the present invention, in which a distal end portion is bent.

FIG. 6 is a schematic view showing a state in which a distal end portion of an endoscope treatment tool according to a second embodiment of the present invention is bent.

FIG. 7 is a side view of a distal end portion of a treatment tool for an endoscope according to a third embodiment of the present invention.

FIG. 8 shows a treatment tool for an endoscope according to a third embodiment of the present invention.
FIG. 8 is a sectional view taken along line VIII-VIII in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flexible tube (cannula tube) 2 Flat part 3 Electrode wire 10 Duodenal fiber scope 11 Treatment instrument insertion channel 12 Insertion part 13 Bending part A A part located in a bending part B A part closer to the tip than inside a bending part

Claims (4)

[Claims] 1. A treatment tool for an endoscope having a flexible tube inserted into and removed from a treatment tool insertion channel inserted through an insertion portion of an endoscope, wherein the flexible tube is used for the treatment. Wherein the cross section of a portion of the flexible tube, which is located in a curved portion formed at a distal end portion of the insertion portion, is flattened in a use state of being inserted into the tool insertion channel. Mirror treatment tool. 2. The treatment tool for an endoscope according to claim 1, wherein the flat cross section of the flexible tube is an ellipse or an oval. 3. The flexible tube according to claim 1, wherein a portion of the flexible tube located closer to the distal end than the inside of the curved portion is formed in a flat cross-sectional shape twisted from a portion located in the curved portion. The treatment tool for an endoscope according to the above. 4. A distal treatment member exposed on an outer surface of the flexible tube is disposed at a portion of the flexible tube located closer to the distal end than inside the curved portion.
The treatment tool for an endoscope according to the above.