JP2002065681A - Insertion tool into insertion channel of endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an insertion tool into an insertion channel of endoscope that ensures the protrusion of the tip end of a flexible tube inserted into the insertion channel of endoscope in a desired direction. SOLUTION: A flexibility (an excluded part 2) that tends to bend easily only in a determined direction from a straight state is added to a part A positioned within a bending part 13 in a flexible tube 1 in a using state that the flexible tube 1 is inserted into the insertion channel 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

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

[0003] Conventionally, for example, Japanese Utility Model 1-1536
As described in Japanese Unexamined Patent Application Publication No. 2000-207, in a use state in which the flexible tube is inserted into the insertion channel of the endoscope, a portion of the flexible tube located in the curved portion of the endoscope is previously set. It has an arc-shaped bending habit.

[0004] As a result, the bending tendency of the flexible tube follows the curve of the 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 insertion channel. There are many cases where the direction changes or the speed changes.

[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 an insertion tool for an endoscope through which the distal end portion of the flexible tube inserted into the insertion channel of the endoscope can be reliably projected in a desired direction. The purpose is to.

[0008]

In order to achieve the above-mentioned object, the present invention provides an endoscope insertion tool for an insertion channel having an insertion portion having a curved portion formed at a distal end portion by a remote operation. In an endoscope, an insertion tool for an insertion channel having a flexible tube inserted into and removed from an insertion channel disposed in an insertion section, the endoscope can be used in a use state in which the flexible tube is inserted into the insertion channel. A portion of the flexible tube located in the curved portion is provided with a bending direction that is easy to bend only in a predetermined direction from a straight state.

[0009] If the thickness of the flexible tube is made thinner depending on the direction, the bending direction can be easily obtained. In the use state in which the flexible tube is inserted into the insertion channel, a portion of the flexible tube located closer to the distal end than the inside of the curved portion also has a predetermined shape related to the bending direction of the portion located in the curved portion. By providing a bending direction that is easy to bend only in the direction, the protruding direction of the distal end portion of the flexible tube can be arbitrarily and precisely controlled.

Further, according to the present invention, when the flexible tube is inserted into the insertion channel, the flexible tube is exposed to the outer surface of the flexible tube at a portion located closer to the distal end than inside the curved portion. The present invention can also be applied to a treatment tool provided with a distal treatment member.

[0011]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows the distal end of a cannula tube used to deliver a contrast agent into the pancreaticobiliary duct via the insertion channel of a duodenal fiberscope.

A cannula tube is provided at a base end of a flexible tube 1 made of, for example, an ethylene tetrafluoride resin tube or a polyethylene resin tube having a diameter of about 2 mm and a length of about 2 m, and a contrast agent inlet (not shown). Are connected.

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 inserted into the insertion channel 11 and used. The insertion portion 12 of the flexible tubular duodenal fiberscope 10 is 1.2 m
The distal end portion is provided with a bending portion 13 which is bendable by a remote operation from an operation portion (not shown) provided on the hand side.

The insertion channel 11 is inserted through the entire length of the insertion portion 12 and has an outlet portion.
A treatment instrument raising piece 14 for controlling the direction of projection of the treatment tools projected through the insertion channel 11 in the front-rear direction.
Is arranged.

As shown in FIG. 4, when the cannula tube 1 is inserted into the pancreatic bile duct, the bending portion 13 is bent in a predetermined direction (the so-called UP direction). It is projected in a state of being bent substantially in the same direction as the bending direction of the curved portion 13.

Referring back to FIG. 1, the cross-sectional shape of the cross section perpendicular to the axis of the cannula tube 1 is a circle in the range from the base end to the vicinity of the distal end, but is inserted into the insertion channel 11 of the duodenal fiberscope 10. In the used state, the entire thickness of the portion A located inside the curved portion 13 (hereinafter, referred to as “the portion A located inside the curved portion 13”) and the range closer to the tip thereof are formed to be thin in a specific direction. Have been.

That is, as shown in FIG. 2 showing the II-II cross section, in the above-mentioned range, the outer surface of the cannula tube 1 whose cross-sectional shape is a perfect circle is formed so as to be cut off in one direction ( In the deleted portion 2), the thickness in that direction is smaller than in the other directions.

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 deleted portion 2 on the back side from a straight state.

Therefore, when the cannula tube 1 passes through the portion of the insertion channel 11 located in the curved portion 13, the direction of the cannula tube 1 around the axis is naturally regulated in a predetermined direction, and the cannula tube 1
Of the insertion channel 11 can be reliably protruded from the front end of the insertion channel 11 in a desired direction.

As shown in FIG. 5, the deleted portion 2 may be formed at a position symmetrical about 180 ° around the axis of the cannula tube 1 so that the cannula tube 1 can be easily bent in the 180 ° symmetrical direction. .

FIG. 6 shows a distal end portion of a cannula tube according to a second embodiment of the present invention. The deleted portion 2 is formed in a portion A located inside the curved portion 13 in parallel with the axis of the cannula tube 1. Further, the portion closer to that is formed by gradually inclining in the circumferential direction of the cannula tube 1.

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

As described above, by appropriately selecting the shape of the deletion section 2, the distal end of the cannula tube 1 can be projected from the distal end of the insertion section 12 of the duodenal fiberscope 10 in the desired direction.

FIG. 8 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 in which a cutout 2 is formed as in the first embodiment described above. The electrode wire 3 (tip treatment member) is arranged so as to be exposed.

The electrode wire 3 includes a pair of holes formed by penetrating a conductive wire, which is inserted through the entire length of the flexible tube 1 over the entire length, into 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. 9 showing a cross section taken along line IX-IX, if the deleted portion 2 and the electrode wire 3 are arranged in a 180 ° symmetrical direction around the axis of the flexible tube 1, the duodenal fiber scope 10 The electrode wire 3 is located inside the curve of the flexible tube 1 protruding from the electrode.

As described above, the position of the electrode wire 3 with respect to the curve of the flexible tube 1 is changed according to the positional relationship between the deletion 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-described embodiment, but can be widely applied to various insertion tools inserted into the insertion channel of the endoscope.

[0030]

According to the endoscope insertion tool for an endoscope according to the present invention, when the flexible tube is inserted into the insertion channel, the portion of the flexible tube located in the curved portion is used. In addition, by giving a bending direction that is easy to bend only in a predetermined direction from a straight state,
The distal end portion of the flexible tube inserted into the insertion channel of the endoscope can be reliably projected in a desired direction.

[Brief description of the drawings]

FIG. 1 is a rear view of a distal end portion of an insertion tool into an insertion channel of an endoscope according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1 of the insertion tool for the insertion channel of the endoscope according to the first embodiment of the present invention.

FIG. 3 is a partial perspective view of the endoscope according to the first embodiment of the present invention in a state where a distal end portion of an insertion tool inserted into an insertion channel of the endoscope is bent;

FIG. 4 is a side view of the first embodiment of the present invention in a used state in which a distal end portion of an insertion tool for an insertion channel of the endoscope is inserted into the insertion channel of the endoscope.

FIG. 5 is a cross-sectional view showing a modification of the cross-sectional view taken along the line II-II in FIG. 1 of the insertion tool for the insertion channel of the endoscope according to the first embodiment of the present invention.

FIG. 6 is a rear view of a distal end portion of an insertion tool to an insertion channel of an endoscope according to a second embodiment of the present invention.

FIG. 7 is a schematic view showing a state in which a distal end portion of an insertion tool for an insertion channel of an endoscope according to a second embodiment of the present invention is bent.

FIG. 8 is a side view of a distal end portion of an insertion tool inserted into an insertion channel of an endoscope according to a third embodiment of the present invention.

FIG. 9 is a sectional view taken along line IX-IX in FIG. 8 of the insertion tool for the insertion channel of the endoscope according to the third embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flexible tube (cannula tube) 2 Deletion part 3 Electrode wire 10 Duodenal fiber scope 11 Insertion channel 12 Insertion part 13 Bending part A The part located in a bending part

Claims (4)

[Claims] 1. An endoscope having an insertion portion having a bent portion formed at a distal end portion by a remote operation and having a flexible tube inserted into and removed from an insertion channel disposed in the insertion portion. In the insertion tool for the channel, in a use state in which the flexible tube is inserted into the insertion channel, only a predetermined direction from a straight state to a portion of the flexible tube located in the curved portion. An insertion tool for an insertion channel of an endoscope, wherein the insertion tool has a bending direction that is easy to bend. 2. The insertion tool for an insertion channel of an endoscope according to claim 1, wherein the bending direction is obtained by forming the thickness of the flexible tube to be thinner than the other according to the direction. 3. In a use state in which the flexible tube is inserted into the insertion channel, a portion of the flexible tube which is located closer to the distal end than the inside of the curved portion is also provided.
The insertion tool for an endoscope according to claim 1 or 2, wherein a bending direction that bends easily in only a predetermined direction related to a bending direction of a portion located in the bending portion is provided. 4. In a use state in which the flexible tube is inserted into the insertion channel, a portion of the flexible tube located closer to the distal end than the inside of the curved portion is provided on an outer surface of the flexible tube. The insertion tool for an insertion channel of an endoscope according to claim 1 or 2, wherein the exposed distal treatment member is disposed.