JP3199259U - Endoscopic treatment tool - Google Patents

Abstract

An endoscopic treatment tool that allows a guide wire to be easily inserted even when force is applied to a multi-lumen sheath. An endoscopic treatment tool includes a multi-lumen sheath 12 having a slit formed in a guide wire lumen, and a distal cylindrical portion 20a that holds a first end portion of the multi-lumen sheath. And a sheath holding portion in which a guide wire insertion opening having a main opening is formed on the side surface of 20a. The first end of the multi-lumen sheath has a side cut surface, an axial cut surface, and a side cut surface. And a bottom surface 1011 which is formed at a position overlapping the main opening on the axial cut surface and communicates with the guide wire lumen, and a top surface 1013 which engages with the axial cut surface and a top tubular portion 20a. And the opening part fixing member 1010 which has the side surface 1012 engaged with a main opening is installed in the base end side of the opening for guide wire insertion. [Selection] Figure 19

Description

  The present invention relates to an endoscope treatment tool.

Various types of endoscopic treatment tools are known that have a treatment portion at the distal end and a multi-lumen sheath extending from the distal end and the treatment portion toward the proximal end. As an example of such a treatment tool for an endoscope, for example, a treatment tool used by being inserted into a bile duct, a dilation balloon for expanding the duodenal papilla, and an incision knife for incising the duodenal papilla into the dilation balloon are combined. And a dilation balloon with a knife.
Such an endoscopic treatment tool is inserted into a patient's body using a guide wire. The multi-lumen sheath is provided with a guide wire lumen through which the guide wire is inserted.
On the proximal end side (proximal side) in the insertion direction of the endoscope treatment instrument, an insertion opening for inserting the guide wire into the guide wire lumen from the proximal end side is provided at the distal end portion of the operation portion. ing. The insertion opening communicates with an opening formed on the side of the proximal end portion of the guide wire lumen in the multi-lumen sheath.

Such an endoscopic treatment tool facilitates the insertion operation into the patient's body, so that the guide wire is inserted into the guide wire at an appropriate position between the distal end portion of the endoscopic treatment tool and the insertion opening. There are many configurations that allow it to enter and exit the lumen. In this case, the multi-lumen sheath has a slit that is narrower than the outer diameter of the guide wire and communicates with the guide wire lumen along the longitudinal direction of the guide wire lumen. Furthermore, a slit having a width wider than the outer diameter of the guide wire is extended in the longitudinal direction of the endoscope treatment tool on the distal end side of the insertion opening in the operation portion.
In this endoscope treatment tool, the guide wire inserted from the insertion opening on the proximal end side can be inserted along the guide wire lumen. However, the operator can take out the guide wire to the side of the multi-lumen sheath through the slits formed in the operation portion and the multi-lumen sheath. For this reason, it becomes possible to operate the guide wire even near the patient.
For example, Patent Document 1 describes a treatment instrument having slits on the distal end side of the multi-lumen sheath and the operation portion as described above.

US Pat. No. 6,879,854

However, in the conventional endoscope treatment tool having a slit in such a guide wire lumen, there is a problem that the guide wire may be difficult to insert in use. First, a conventional endoscope treatment tool will be described with reference to FIGS. 73 to 76. FIG.
FIG. 73 is a schematic perspective view showing a proximal end portion of a multi-lumen tube as an example of a treatment tool for an endoscope according to the prior art. FIG. 74 is a schematic perspective view showing the configuration in the vicinity of the guide wire insertion opening. 75 and 76 are operation explanatory views of an example of a conventional endoscope treatment tool.

As shown in FIGS. 73 and 74, a treatment tool 201 as an example of the prior art includes a multi-lumen sheath 212 that is fitted into the distal end tubular portion 220a of the operation portion main body 220 (see FIG. 74) on the proximal end side. .
Inside the multi-lumen sheath 212, three lumens of a first lumen 212a, a second lumen 212b, and a third lumen 212c are formed extending in the longitudinal direction. The first lumen 212a is a through-hole through which a guide wire (not shown) is inserted. The second lumen 212b and the third lumen 212c are through-holes having a smaller diameter than the first lumen 212a. The second lumen 212b and the third lumen 212c can, for example, insert a linear member or allow fluid to flow according to the application of the treatment instrument 201.
The first lumen 212a is formed with a slit 212e that extends along the longitudinal direction of the multi-lumen sheath 212 and communicates with the first lumen 212a. The gap width of the slit 212e is narrower than the outer diameter of a guide wire (not shown).

At the base end portion of the multi-lumen sheath 212, a part of the side wall portion of the first lumen 212a is cut away to form a guide wire insertion opening 212i. Around the insertion opening 212i, an axial cut surface 212f and a side cut surface 212g are formed.
The axial cut surface 212f is a plane formed by cutting in the longitudinal direction from the proximal end surface 212k (see FIG. 65) of the multi-lumen sheath 212 through the approximate center of the first lumen 212a.
The side cut surface 212g is a plane formed by cutting in the direction perpendicular to the longitudinal direction of the multi-lumen sheath 212 from the outer peripheral surface where the slit 212e is formed toward the distal end portion in the cut direction of the axial cut surface 212f. is there.

As shown in FIG. 74, the base end portion of the multi-lumen sheath 212 is inserted into the distal end tubular portion 220a of the operation portion main body 220, and is fixed to the operation portion main body 220 via the fixing member 1001 as shown in FIG. Is done.
A guide wire insertion opening 220b is formed in the distal tubular portion 220a at a position facing the insertion opening 212i of the multi-lumen sheath 212.

The guide wire insertion opening 220b is a substantially rectangular opening that is long in the axial direction of the multi-lumen sheath 212 and the distal tubular portion 220a. The width of the guide wire insertion opening 220b in the short direction has the same size as the width of the insertion opening 212i in the short direction.
In the guide wire insertion opening 220b, a slit 220c penetrating to the tip of the tip cylindrical portion 220a is formed at the tip in the longitudinal direction.
The slit 220c extends coaxially with the slit 212e at a position overlapping the slit 212e of the multi-lumen sheath 212. The gap width of the slit 220c is wider than the outer diameter of the guide wire (not shown) and narrower than the width in the short direction of the guide wire insertion opening 220b.
In the distal tubular portion 220a, the distal end side of the guide wire insertion opening 220b has a C-shaped cross section, and a guide portion 220j for fitting the multi-lumen sheath 212 is formed.
The multi-lumen sheath 212 is fixed at a position where the side cut surface 212g is an intermediate portion in the longitudinal direction of the guide portion 220j. For this reason, as shown in FIG. 75, the base end side (right side in the drawing) of the guide portion 220j covers the insertion opening 212i further to the base end side than the side cut surface 212g.

With reference to FIG. 75 and FIG. 76, the operation | work which inserts the guide wire 230 from the opening 220b for guide wire insertion of the treatment tool 201 is demonstrated.
As shown in FIG. 75, the operator inserts the guide wire 230 from the side of the operation unit main body 220 into the guide wire insertion opening 220b and inserts it into the first lumen 212a covered with the guide unit 220j.
At this time, as shown in FIG. 76, when the operator inserts the distal end portion 230a of the guide wire 230 between the guide portion 220j and the axial cut surface 212f, the guide wire 230 is guided by the guide portion 220j. . When the operator further sends out the guide wire 230 to the distal end side, the distal end portion 230a hits the side cut surface 212g.

Since the multi-lumen sheath 212 has a small number of lumens and the diameter of the first lumen 212a is large, the side cut surface 212g has an arc shape, and the radial width thereof is larger than the outer diameter of the guide wire 230. small. For this reason, only a part of the distal end portion 230a of the guide wire 230 is in contact with the side cut surface 212g while protruding from the side cut surface 212g inward in the radial direction.
For this reason, if an operator continues insertion, the front-end | tip part 230a will slide on the side part cut surface 212g, and will move inside the 1st lumen | rumen 212a. When the distal end portion 230a enters the first lumen 212a, the guide wire 230 is smoothly inserted along the inner peripheral surface of the first lumen 212a.

As described above, in the treatment instrument 201, even when the operator inserts the guide wire 230 at a position shifted from the first lumen 212a and contacts the side cut surface 212g, the operator pushes the guide wire 230 further. Only, the guide wire 230 can be inserted into the first lumen 212a.
However, when the endoscope treatment tool is inserted into the endoscope or into the patient's body, the multi-lumen sheath of the long endoscope treatment tool is often rounded or twisted. When the multi-lumen sheath is twisted, as shown in FIG. 78, the position of the guide wire insertion opening 212i may also be rotated in the circumferential direction and may not be aligned with the guide wire insertion opening 220b of the operation section. As a result, the guide wire may not be smoothly inserted.

  Also, in recent years, endoscopic treatment tools have become multifunctional and miniaturized, and the number of lumens in a multi-lumen sheath used for an endoscopic treatment tool has increased, or more than a guidewire lumen through which a guidewire is inserted. May have a large-diameter lumen. For example, when the endoscope treatment instrument is a dilation balloon, a balloon lumen through which a fluid for expanding the balloon passes is required. The balloon lumen needs to have an inner diameter as large as possible in order to shorten the deflation time of the balloon. In this case, the inner diameter of the balloon lumen may be greater than or equal to the inner diameter of the guide wire lumen. In such an endoscopic treatment tool, the guide wire lumen may have a small diameter, and thus the guide wire may not be inserted smoothly.

79 to 83, a description will be given using another example of a conventional endoscopic treatment tool including a multi-lumen sheath to which a large-diameter lumen is added.
FIG. 79 is a schematic perspective view showing a proximal end portion of a multi-lumen tube of another example of the endoscope treatment tool of the prior art. FIG. 80 is a schematic perspective view showing the configuration in the vicinity of the guide wire insertion opening. FIG. 81 is an operation explanatory diagram of another example of the endoscope treatment tool of the related art. FIG. 82 is a plan view of the Z view in FIG. 83 is a cross-sectional view taken along line RR in FIG.

  As shown in FIGS. 79 and 80, a treatment tool 241 according to another example of the prior art includes a multi-lumen sheath 242 having the same outer diameter as the multi-lumen sheath 212 instead of the multi-lumen sheath 212 of the treatment tool 201. Hereinafter, a description will be given centering on differences from the treatment instrument 201. Members, parts, etc. that are the same as or equivalent to the treatment instrument 201 are given the same reference numerals, and common descriptions are omitted.

The multi-lumen sheath 242 includes a first lumen 242a having a smaller diameter instead of the first lumen 212a of the treatment instrument 201. Further, the multi-lumen sheath 242 includes a fourth lumen 242d having substantially the same diameter as the first lumen 242a.
The first lumen 242a and the fourth lumen 242d are disposed at positions facing each other across the central axis O242 of the multi-lumen sheath 242. The second lumen 212b and the third lumen 212c are also arranged at positions facing each other across the central axis O242 of the multi-lumen sheath 242. However, the facing direction of the second lumen 212b and the third lumen 212c is a direction orthogonal to the facing direction of the first lumen 242a and the fourth lumen 242d.
The center of the first lumen 242a is located radially outside the center of the first lumen 212a in the treatment tool 201 with respect to the center of the multi-lumen sheath 242.

Similar to the multi-lumen sheath 212, a part of the side wall of the first lumen 242a is cut out at the base end of the multi-lumen sheath 242 to form a guide wire insertion opening 242i. Around the insertion opening 242i, an axial cut surface 242f and a side cut surface 242g are formed.
The axial cut surface 242f is a plane formed by passing through the approximate center of the first lumen 242a and cutting in the longitudinal direction from the proximal end surface 212k of the multi-lumen sheath 242.
The side cut surface 242g is a plane formed by cutting in the direction orthogonal to the longitudinal direction of the multi-lumen sheath 242 from the outer peripheral surface where the slit 212e is formed toward the distal end portion in the cut direction of the axial cut surface 242f. is there.

  As shown in FIG. 80, the base end portion of the multi-lumen sheath 242 is inserted into the distal end tubular portion 220 a of the operation portion main body 220 and is fixed to the operation portion main body 220.

With reference to FIGS. 81 to 83, the operation of inserting the guide wire 230 from the guide wire insertion opening 220b of the treatment instrument 241 will be described.
As in the case of the treatment tool 201, the operator inserts the guide wire 230 from the side of the operation unit main body 220 into the guide wire insertion opening 220b and inserts it into the first lumen 242a covered with the guide unit 220j. .
At this time, as shown in FIG. 81, the operator inserts the distal end portion 230a of the guide wire 230 between the guide portion 220j and the axial cut surface 242f. When the operator further sends out the guide wire 230 to the distal end side, the distal end portion 230a hits the side cut surface 242g.
The multi-lumen sheath 242 has a larger number of lumens than the multi-lumen sheath 212, and the inner diameter of the first lumen 242a is smaller than the inner diameter of the first lumen 212a. For this reason, as shown in FIG. 83, the radial width of the side cut surface 242g is wider than the radial width of the side cut surface 212g. For this reason, for example, a portion in which the radial width of the side cut surface 242g is equal to or larger than the outer diameter of the guide wire 230 is generated.
When the distal end portion 230a of the guide wire 230 comes into contact with such a wide portion on the side cut surface 242g, the entire distal end portion 230a comes into contact with the side cut surface 242g. Is locked to the side cut surface 242g.
As a result, even if the operator continues the insertion, the distal end portion 230a may not enter the first lumen 242a.

Thus, in the treatment instrument 241, the distal end portion 230a of the guide wire 230 is likely to be caught in the side cut surface 242g and cannot move forward. If the distal end portion 230a is caught by the side cut surface 242g and cannot advance, the operator returns the guide wire 230 and tries to insert again, or the operator inserts the distal end portion 230a so as to enter the first lumen 242a. It is necessary to do.
For this reason, the workability of the insertion operation of the guide wire 230 is deteriorated.

  The present invention has been made in view of the problems that occur when the multi-lumen sheath is twisted, and even when a twisting force is applied to the multi-lumen sheath, the guide wire can be easily applied to the guide wire lumen. It aims at providing the treatment tool for endoscopes which can be penetrated.

  The present invention provides a plurality of lumens including a guide wire lumen through which a guide wire is inserted, and a first length that extends along an axial direction of the guide wire lumen and that allows the guide wire to be taken in and out of the guide wire lumen. A multi-lumen sheath in which a slit is formed, and a cylindrical portion that holds a first end of the multi-lumen sheath, and the first side when viewed from the radial direction in order from the distal end side on the side surface of the cylindrical portion. A sheath holding portion formed with a guide wire insertion opening having a second slit that overlaps the slit of the second slit and has a wider gap than the first slit and a main opening that has a wider opening width than the second slit. The first end portion of the multi-lumen sheath is formed from the outer peripheral surface of the multi-lumen sheath as viewed from the radial direction of the multi-lumen sheath. A side cut surface formed by cutting to the inside of the dwy lumen, and a position of the guide wire lumen from the axial end surface side of the first end portion of the multi-lumen sheath to a position intersecting the side cut surface. An axial cut surface formed by cutting parallel to a central axis, the side cut surface, and an opening formed at a position overlapping the main opening in the axial cut surface and communicating with the guide wire lumen; An opening fixing member having a bottom surface that abuts against the axial cut surface, an upper surface that engages with the inner wall of the cylindrical portion, and a side surface that engages with the main opening in the circumferential direction. It is an endoscope treatment tool installed on the proximal end side of a wire insertion opening.

  According to the endoscope treatment tool of the present invention, even when a twisting force is applied to the multi-lumen sheath, the guide wire can be easily inserted into the guide wire lumen.

1 is a schematic perspective view showing a configuration of an endoscope treatment tool according to a first embodiment of the present invention. It is a typical front view showing composition of a treatment tool for endoscopes of a 1st embodiment of the present invention. It is typical sectional drawing which follows the longitudinal direction of the treatment tool for endoscopes of the 1st Embodiment of this invention. It is AA sectional drawing in FIG. It is an enlarged view of the C section in FIG. It is a typical perspective view which shows the structure of the elongation suppression wire of the treatment tool for endoscopes of the 1st Embodiment of this invention. It is an expanded sectional view of a balloon tip part. It is BB sectional drawing in FIG. It is a typical perspective view which shows the structure in the balloon tube of the treatment tool for endoscopes of the 1st Embodiment of this invention. It is XX sectional drawing in FIG. It is a typical perspective view which shows the structure of the vicinity of the opening for guide wire insertion of the treatment tool for endoscopes of the 1st Embodiment of this invention. It is a top view of E view in FIG. It is GG sectional drawing in FIG. It is FF sectional drawing in FIG. It is a typical perspective view showing the composition of the 2nd end part of the 2nd sheath of the treatment tool for endoscopes of a 1st embodiment of the present invention. It is a top view of the T view in FIG. It is a perspective view which shows the opening for guide wire insertion to which the cutting surface fixing member was attached. It is a figure which shows a cut surface fixing member. It is MM sectional drawing in FIG. It is an enlarged view of the D section in FIG. It is process explanatory drawing of the perspective of the manufacturing process of the treatment tool for endoscopes of the 1st Embodiment of this invention. It is process explanatory drawing of the planar view of the manufacturing process of the treatment tool for endoscopes of the 1st Embodiment of this invention. It is JJ sectional drawing in FIG. It is process explanatory drawing of the perspective of the manufacturing process of the treatment tool for endoscopes of the 1st Embodiment of this invention. It is process explanatory drawing of the planar view of the manufacturing process of the treatment tool for endoscopes of the 1st Embodiment of this invention. It is KK sectional drawing in FIG. It is process explanatory drawing of the perspective of the manufacturing process of the treatment tool for endoscopes of the 1st Embodiment of this invention. It is process explanatory drawing of the perspective of the manufacturing process of the treatment tool for endoscopes of the 1st Embodiment of this invention. It is a top view of the U view in FIG. It is LL sectional drawing in FIG. It is operation | movement explanatory drawing of planar view of the treatment tool for endoscopes of the 1st Embodiment of this invention. It is operation | movement explanatory drawing of planar view of the treatment tool for endoscopes of the 1st Embodiment of this invention. It is sectional drawing explaining an effect | action of the treatment tool for endoscopes of the 1st Embodiment of this invention. It is sectional drawing explaining an effect | action of the treatment tool for endoscopes of the 1st Embodiment of this invention. It is a schematic diagram which shows one process at the time of use of the treatment tool for endoscopes of the 1st Embodiment of this invention. It is a schematic diagram which similarly shows one process at the time of use of the treatment tool for endoscopes. It is a schematic diagram which similarly shows one process at the time of use of the treatment tool for endoscopes. It is a schematic diagram which similarly shows one process at the time of use of the treatment tool for endoscopes. It is a schematic diagram which similarly shows one process at the time of use of the treatment tool for endoscopes. It is a schematic diagram which similarly shows one process at the time of use of the treatment tool for endoscopes. It is a schematic diagram which similarly shows one process at the time of use of the treatment tool for endoscopes. It is a schematic diagram which similarly shows one process at the time of use of the treatment tool for endoscopes. It is a schematic diagram which similarly shows one process at the time of use of the treatment tool for endoscopes. It is a schematic diagram which similarly shows one process at the time of use of the treatment tool for endoscopes. It is a schematic diagram which similarly shows one process at the time of use of the treatment tool for endoscopes. It is a schematic diagram which similarly shows one process at the time of use of the treatment tool for endoscopes. It is a schematic diagram which similarly shows one process at the time of use of the treatment tool for endoscopes. It is a schematic diagram which similarly shows one process at the time of use of the treatment tool for endoscopes. It is a schematic diagram which similarly shows one process at the time of use of the treatment tool for endoscopes. It is a schematic diagram which similarly shows one process at the time of use of the treatment tool for endoscopes. It is a schematic diagram which similarly shows one process at the time of use of the treatment tool for endoscopes. It is a schematic diagram which similarly shows one process at the time of use of the treatment tool for endoscopes. It is a schematic diagram which similarly shows one process at the time of use of the treatment tool for endoscopes. It is a schematic diagram which similarly shows one process at the time of use of the treatment tool for endoscopes. It is a schematic diagram which similarly shows one process at the time of use of the treatment tool for endoscopes. It is a schematic diagram which similarly shows one process at the time of use of the treatment tool for endoscopes. It is a schematic diagram which similarly shows one process at the time of use of the treatment tool for endoscopes. It is a schematic diagram which shows operation | movement of the balloon of the treatment tool for endoscopes of the 1st Embodiment of this invention. It is a schematic diagram which shows one process at the time of use of the treatment tool for endoscopes in the 1st Embodiment of this invention. It is sectional drawing explaining the effect | action of the elongation suppression wire of the treatment tool for endoscopes of the 1st Embodiment of this invention. It is a typical perspective view which shows the structure of the 2nd end part of the 2nd sheath of the treatment tool for endoscopes of the 2nd Embodiment of this invention. It is a top view of V view in FIG. FIG. 63 is a YY cross-sectional view in FIG. 62. It is process explanatory drawing of the perspective of the manufacturing process of the treatment tool for endoscopes of the 2nd Embodiment of this invention. It is process explanatory drawing of the cross section of the manufacturing process of the treatment tool for endoscopes of the 2nd Embodiment of this invention. It is process explanatory drawing of the perspective of the manufacturing process of the treatment tool for endoscopes of the 2nd Embodiment of this invention. It is process explanatory drawing of the cross section of the manufacturing process of the treatment tool for endoscopes of the 2nd Embodiment of this invention. It is process explanatory drawing of the perspective of the manufacturing process of the treatment tool for endoscopes of the 2nd Embodiment of this invention. It is process explanatory drawing of the cross section of the manufacturing process of the treatment tool for endoscopes of the 2nd Embodiment of this invention. It is a figure which shows the base end part of the multi-lumen sheath in the modification of this invention. It is a figure which shows the opening for guide wire insertion in the modification of this invention. It is a figure which shows the cut surface fixing member in the modification of this invention. It is a typical perspective view which shows the base end part of the multilumen tube of an example of the treatment tool for endoscopes of a prior art. It is a typical perspective view which shows the structure of the vicinity of the opening for guide wire insertion of an example of the treatment tool for endoscopes of a prior art. It is operation | movement explanatory drawing of an example of the treatment tool for endoscopes of a prior art. It is operation | movement explanatory drawing of an example of the treatment tool for endoscopes of a prior art. It is a fragmentary sectional view of an example of the treatment tool for endoscopes of a prior art. It is operation | movement explanatory drawing of an example of the treatment tool for endoscopes of a prior art. It is a typical perspective view which shows the base end part of the multilumen tube of the other example of the treatment tool for endoscopes of a prior art. It is a typical perspective view which shows the structure of the vicinity of the opening for guide wire insertion of the other example of the treatment tool for endoscopes of a prior art. It is operation | movement explanatory drawing of the other example of the treatment tool for endoscopes of a prior art. It is a top view of the Z view in FIG. It is RR sectional drawing in FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In all the drawings, even if the embodiments are different, the same or corresponding members are denoted by the same reference numerals, and common description is omitted.

[First Embodiment]
An endoscope treatment tool according to a first embodiment of the present invention will be described.
FIG. 1 is a schematic perspective view showing a configuration of an endoscope treatment tool according to a first embodiment of the present invention. FIG. 2 is a schematic front view showing the configuration of the endoscope treatment tool according to the first embodiment of the present invention. FIG. 3 is a schematic cross-sectional view along the longitudinal direction of the endoscope treatment tool according to the first embodiment of the present invention. FIG. 4 is a cross-sectional view taken along the line AA in FIG. FIG. 5 is an enlarged view of a portion C in FIG. FIG. 6 is a schematic perspective view showing a configuration of an elongation suppressing wire of the endoscope treatment tool according to the first embodiment of the present invention. 7 is a cross-sectional view taken along the line BB in FIG. FIG. 8 is a schematic perspective view showing the configuration inside the balloon tube of the endoscope treatment tool according to the first embodiment of the present invention. FIG. 9 is a schematic perspective view showing a configuration in the vicinity of the guide wire insertion opening of the endoscope treatment tool according to the first embodiment of the present invention. FIG. 10 is a plan view as seen from E in FIG. 11 is a cross-sectional view taken along the line GG in FIG. 12 is a cross-sectional view taken along line FF in FIG. FIG. 13 is a schematic perspective view showing the configuration of the second end portion of the second sheath of the endoscope treatment tool according to the first embodiment of the present invention. FIG. 14 is a plan view of the T view in FIG. FIG. 15 is an enlarged view of a portion D in FIG.
In addition, since each drawing is a schematic diagram, the shape and dimension are exaggerated (other drawings are also substantially the same).

As shown in FIG. 1 to FIG. 3, the treatment tool 1 (endoscopic treatment tool) of the present embodiment includes an insertion part 2 to be inserted into the patient's body and an operation part for operating the treatment tool 1 outside the patient's body. 3.
The insertion part 2 is a linear long member. The insertion unit 2 is inserted into the patient's body through the treatment instrument channel of the endoscope.

In this specification, when the relative position in the treatment instrument 1 is described, unless otherwise specified, the distal end side (distal side) in the insertion direction with respect to the patient is simply referred to as “the distal end side” and the opposite side (the operation unit 3 is The proximal side (proximal side) that is provided) is simply referred to as “proximal side”.
In this specification, when the relative positions with respect to an axial or cylindrical member (including a part) that can specify an axis such as the central axis are described, they are referred to as “axial direction”, “circumferential direction”, and “radial direction”. There is a case. The axial direction is a direction along the axis. The circumferential direction is a direction around the axis. The radial direction is a direction along a line intersecting the axis in a plane orthogonal to the axis. In the radial direction, the direction away from the axis may be referred to as the radially outer side, and the direction approaching the axis may be referred to as the radially inner side.

The insertion portion 2 includes a distal end side insertion portion 2A and a proximal end side insertion portion 2B in this order from the distal end side toward the proximal end side.
The distal end side insertion portion 2A includes a treatment portion 4 and a balloon portion 5 in this order from the distal end side toward the proximal end side. The first sheath 11 is inserted through the treatment section 4 and the balloon section 5.

As shown in FIG. 4, the first sheath 11 is a multi-lumen sheath in which three lumens of a first lumen 11a (guide wire lumen), a second lumen 11b, and a third lumen 11c are penetrated in the axial direction.
The first lumen 11a is a through-hole through which a guide wire (not shown) that guides the insertion of the treatment instrument 1 in the body of the patient is inserted. The guide wire is used as a guide for guiding the distal end portion of the insertion portion 2 of the treatment instrument 1 to a treatment target site. A guide wire having a predetermined wire diameter is used in combination with the treatment instrument 1 according to the inner diameter of the blood vessel of the treatment target site.
The 1st lumen | rumen 11a has an internal diameter which can insert a guide wire smoothly.

The second lumen 11b and the third lumen 11c are through-holes that are required for the treatment and are used for inserting a linear member different from the guide wire or for circulating a chemical solution required for the treatment. . In the present embodiment, the inner diameters of the second lumen 11b and the third lumen 11c are both smaller than the inner diameter of the first lumen 11a.
For example, a later-described knife wire 10 can be inserted into the second lumen 11b. For example, a liquid such as a contrast medium can be circulated through the third lumen 11c.

Although the kind of treatment part 4 is not specifically limited, below, as shown to FIGS. 1-3, the example in the case where the treatment part 4 is provided with the knife wire 10 is demonstrated as an example.
The knife wire 10 is a conductive wire capable of cutting a living tissue by passing a high-frequency current through the living tissue.
The knife wire 10 is exposed to the outside of the first sheath 11 at the distal end side insertion portion 2A.
Although not shown, the distal end portion of the knife wire 10 is locked in the second lumen 11 b of the first sheath 11.
As shown in FIG. 2, the knife wire 10 is exposed to the outside of the first sheath 11 from the first side hole 11d communicating with the second lumen 11b, and is second on the proximal end side with respect to the first side hole 11d. It enters the second lumen 11b again from the second side hole 11e provided in communication with the lumen 11b. The knife wire 10 (see FIG. 4) that has entered the second lumen 11b is further extended to the proximal end side in the second lumen 11b. Further, the knife wire 10 is extended to the operation unit 3 (described later) through a lumen formed in the proximal side insertion unit 2B (described later) and fixed to the operation unit 3.
A portion of the knife wire 10 exposed to the outside of the first sheath 11 contributes to incision of the living tissue. In the present embodiment, the knife wire 10 can be used for, for example, a procedure for incising the duodenal papilla.

  In this embodiment, since the knife wire 10 is inserted, the first sheath 11 is made of a flexible insulating material having heat resistance. In the present embodiment, the first sheath 11 is made of, for example, polytetrafluoroethylene (PTFE).

  As shown in FIG. 1, the balloon portion 5 includes a balloon 14 and a balloon tube 15 from the distal end side toward the proximal end side in the outer peripheral portion on the proximal end side of the first sheath 11.

As shown in FIG. 3, the balloon 14 has a cylindrical first neck portion 14 a having an inner diameter that fits around the first sheath 11 on the distal end side. The balloon 14 has a cylindrical second neck portion 14b slightly larger than the outer diameter of the first sheath 11 on the proximal end side. The middle part of the balloon 14 in the longitudinal direction can be expanded to a diameter larger than the inner diameters of the first neck part 14a and the second neck part 14b.
FIG. 3 shows the balloon 14 in an expanded state. 1 and 2 show a state in which the balloon 14 is contracted.

The balloon 14 is a compliance balloon whose expansion diameter changes according to the pressure of the fluid in the balloon 14. In the present embodiment, the correlation between the outer diameter of the balloon 14 and the inner pressure of the balloon 14 is non-linear.
The outer diameter of the balloon 14 has a one-to-one relationship with respect to at least three internal pressures. Hereinafter, the values of the outer diameters of the balloons 14 for the three internal pressures are defined as “compliance”. Although not particularly illustrated, the compliance value of the balloon 14 is affixed as a display label, for example, to the operation unit 3 so that the operator can understand.
As the material of the balloon 14, for example, polyamide, polyamide elastomer, polyethylene terephthalate (PET) elastomer, polyurethane, or the like can be employed.
The balloon 14 of this embodiment manufactured with such a material has a compliance set to 15 mm / 3 ATM, 17 mm / 4 ATM, 18 mm / 5 ATM, for example.
Here, the notation “15 mm / 3 ATM” means that when the inner pressure of the balloon 14 is 3 ATM, the outer diameter of the balloon 14 is 15 mm.
The balloon 14 may be made of a highly stretchable material such as latex although the expansion force is extremely small.

The balloon tube 15 is a cylindrical member having a larger diameter than the first sheath 11 and a smaller outer diameter than the outer diameter when the balloon 14 is expanded.
As shown in FIG. 5, a cylindrical locking portion 15 a for locking the fixed tube 17 is formed on the distal end side of the balloon tube 15.

As shown in FIGS. 5 and 6, the fixed tube 17 includes a cylindrical portion 17 a that passes through the first sheath 11, and a locking portion 17 b that protrudes radially outward from the distal end portion of the cylindrical portion 17 a.
The elongation suppressing wire 16 that suppresses the elongation in the longitudinal direction of the insertion portion 2 is fixed to the proximal end portion of the cylindrical portion 17a. The elongation suppressing wire 16 is made of a metal wire having higher tensile rigidity than the first sheath 11 and the second sheath 12 described later. For example, as the elongation suppressing wire 16, a stainless steel wire can be adopted.
The elongation suppressing wire 16 is extended to the operation unit 3 through a lumen formed in the balloon tube 15 and the second sheath 12 described later. A method of fixing the elongation suppressing wire 16 and the operation unit 3 will be described later.

As shown in FIG. 5, the fixed tube 17 is arranged with the cylindrical portion 17a facing the tip side. The fixed tube 17 is inserted through the first sheath 11. The cylindrical portion 17 a of the fixed tube 17 is fitted into the locking portion 15 a of the balloon tube 15. The locking portion 17 b of the fixed tube 17 is locked to the distal end surface 15 d of the locking portion 15 a of the balloon tube 15.
As will be described later, when the treatment instrument 1 is operated, the treatment instrument 1 receives an external force from the treatment instrument channel or the like of the endoscope, and tension is generated in the elongation restraining wire 16. And is locked to the distal end surface of the locking portion 15a.

The second neck portion 14 b of the balloon 14 is disposed so as to be fitted around the locking portion 17 b of the fixed tube 17 and the locking portion 15 a of the balloon tube 15. Further, the second neck portion 14b is watertightly fixed at the first fixing portion 15b on the outer peripheral surface of the balloon tube 15 on the proximal end side of the locking portion 15a.
The first fixing portion 15b can be formed, for example, by thermally welding the second neck portion 14b to the outer peripheral portion on the proximal end side about several mm from the distal end of the balloon tube 15. In this case, since the locking portion 15a is located on the tip side of the first fixing portion 15b, it is not deformed by the influence of heating. For this reason, the latching | locking part 15a keeps a cylindrical shape even after formation of the 1st fixing | fixed part 15b.
In such an assembled state, the balloon 14 and the balloon tube 15 constitute a tubular portion that is watertightly connected. The distal end of the tubular portion is closed by fixing the first neck portion 14a to the first sheath 11. For example, when the first sheath 11 is made of polytetrafluoroethylene (PTFE), the balloon 14 Even if polyurethane, polyamide, polyamide elastomer or the like is used, the balloon 14 is not thermally welded to the first sheath 11. Therefore, when the first sheath 11 is made of polytetrafluoroethylene (PTFE), fluorine atoms are extracted from the surface of the fluororesin such as PTFE, which is called tetraetch or fluorobonder, in the first sheath 11. The first sheath 11 and the balloon 14 are joined by performing heat welding in a state where surface treatment for improving adhesiveness is performed. Alternatively, as shown in FIG. 7, a marking 1002 made of phenolic resin that has adhesiveness to polyurethane, polyamide, and polyamide elastomer and has higher heat resistance after curing than those materials is applied to the first sheath 11 subjected to the surface treatment. The balloon 14 and the marking 1002 may be joined after the marking 1002 is cured. Further, the first sheath subjected to the surface treatment and the balloon may be directly joined without using the phenol resin marking.
Further, since the first neck portion 14a is usually thicker and harder than the expanded portion of the balloon, the first sheath 11 is bent sharply at the tip of the first neck portion 14a when protruding from the endoscope and inserted into the patient's body. It may be difficult to insert. As shown in FIG. 7, in order to suppress rapid bending and improve insertability, it is made of a resin that is softer than the material of the balloon 14 and similar to the material of the balloon 14 or has good adhesion to the balloon material. The flexible member 1003 may be disposed so as to cover the distal end portion of the first neck portion 14a, and the first neck portion 14a, the flexible member 1003, and the first sheath 11 may be joined.
Thus, the first neck portion 14a is fixed to the first sheath 11 and sealed in a watertight manner.
Further, in the treatment instrument 1, only the first sheath 11, a portion where the first sheath 11 and the balloon 14 overlap, a portion where the first sheath 11 and the balloon tube 15 overlap, and each portion of the second sheath 12 are included. The materials and dimensions are arranged so that the treatment instrument 1 as a whole is sequentially hardened from the distal end side. As a result, the treatment tool 1 can be easily inserted into an endoscope and a patient.
As shown in FIG. 3, the second fixing portion 15 c at the base end portion of the balloon tube 15 is connected to the second sheath 12 via a second end portion E <b> 2 of the second sheath 12 described later and a connecting member 1001. It is fixed watertight.
A gap is formed between the outer peripheral surface of the first sheath 11 and the inner peripheral surfaces of the balloon 14 and the balloon tube 15 along the axial direction of the balloon unit 5. This gap constitutes a liquid feeding space S <b> 1 that serves as a fluid flow path for expanding the balloon 14.
In the balloon part 5, the elongation suppression wire 16 is extended to the base end side through the liquid feeding space S1.

As shown in FIG. 3, the proximal side insertion portion 2B includes a second sheath 12 (multi-lumen sheath).
As shown in FIG. 8, the second sheath 12 has a multi-lumen in which four lumens of a first lumen 12a (guide wire lumen), a second lumen 12b, a third lumen 12c, and a fourth lumen 12d are penetrated in the axial direction. It is a lumen sheath.

The first lumen 12a is a through-hole through which a guide wire (not shown) that guides the insertion of the treatment instrument 1 in the patient's body is inserted, like the first lumen 11a of the first sheath 11. The first lumen 12a has an inner diameter that allows a guide wire to be smoothly inserted.
In the first lumen 12a, a slit 12e (first slit) having a gap w is formed in part. The gap width w of the second sheath 12 is narrower than the outer diameter of the guide wire inserted into the first lumen 12a.
As shown in FIG. 3, the slit 12 e extends from the vicinity of the second fixing portion 15 c on the distal end side of the second sheath 12 to the end portion on the proximal end side.
The inner diameter of the first lumen 12a is approximately the same (including the same case) as the first lumen 11a in the first sheath 11.

The second lumen 12b and the third lumen 12c are through-holes that are used to insert a treatment linear member different from the guide wire or to distribute a chemical solution required for the treatment. In the present embodiment, the inner diameters of the second lumen 12b and the third lumen 12c are thicker than the second lumen 11b and the third lumen 11c in the first sheath 11, respectively, in order to facilitate passage of fluid and wires. .
The inner diameters of the second lumen 12b and the third lumen 12c are both smaller than the inner diameter of the first lumen 11a.
For example, the knife wire 10 can be inserted into the second lumen 12b. For example, the third lumen 12c can circulate a liquid such as a contrast medium.

The fourth lumen 12d is a through hole (balloon lumen) that forms a fluid flow path for expanding the balloon 14. Further, in the present embodiment, the fourth lumen 12d also inserts the elongation suppressing wire 16 therein.
The fourth lumen 12d needs to have an inner diameter as large as possible in order to shorten the deflation time of the balloon 14. In the present embodiment, as an example, the inner diameter of the fourth lumen 12d is substantially equal to the inner diameter of the first lumen 12a (including the case where they are equal).

  The first lumen 12a and the fourth lumen 12d are arranged at positions facing each other across the central axis O12 of the second sheath 12. The second lumen 12b and the third lumen 12c are also arranged at positions facing each other across the central axis O12 of the second sheath 12. However, the facing direction of the second lumen 12b and the third lumen 12c is a direction orthogonal to the facing direction of the first lumen 12a and the fourth lumen 12d.

The second fixing portion 15c of the balloon tube 15 is fixed to the second end E2 that is the distal end portion of the second sheath 12 via the connecting member 1001 in a watertight manner.
As shown in FIG. 9, at the second end E2 of the second sheath 12, the base end of the first sheath 11 facing the second sheath 12 has flexibility and insulating properties such as polyether ether ketone ( They are connected to each other through a connection tube 13 made of PEEK).
The connection tube 13 penetrates the connecting member 1001 in a state in which watertightness is ensured with an adhesive or the like.
Further, it is preferable that the connection tube 13 and the connecting member 1001 are installed at a position that does not protrude from the distal end of the endoscope during the procedure. For example, in the case of this balloon, 20 cm to 25 cm from the tip is preferable.

The connection tube 13 includes a first connection tube 13a, a second connection tube 13b, and a third connection tube 13c.
The first connection tube 13a is press-fitted into the first lumen 11a of the first sheath 11 and the first lumen 12a of the second sheath 12, thereby connecting the two in a watertight manner.
The second connection tube 13b is press-fitted into the second lumen 11b of the first sheath 11, but since there is a gap between the second lumen 12b of the second sheath 12 having a large inner diameter, an adhesive is used as shown in FIG. The gap is filled with or a pipe-like spacer is added to form a press-fit state, and the two are connected in a watertight manner.
The third connection tube 13c is press-fitted into the third lumen 11c of the first sheath 11, but there is a gap between the third lumen 12c of the second sheath 12 having a large inner diameter, and therefore an adhesive as shown in FIG. The gap is filled with or a pipe-like spacer is added to form a press-fit state, and the two are connected in a watertight manner.
By the connection tube 13, the first lumens 11a and 12a, the second lumens 11b and 12b, and the third lumens 11c and 12c constitute independent communication paths. Since these communication paths do not communicate with the liquid feeding space S1, fluid in the liquid feeding space S1 does not enter each communication path.
The first lumens 11a and 12a communicate with the outer peripheral environment of the second sheath 12 through slits 12e formed in the first lumen 12a.

As shown in FIG. 3, the fourth lumen 12d of the second sheath 12 opens from the second end E2 into the liquid feeding space S1 via the connecting member 1001. For this reason, the fourth lumen 12d communicates with the liquid feeding space S1 via the connecting member 1001.
An extension suppressing wire 16 extending into the liquid feeding space S1 is inserted through the fourth lumen 12d. The elongation suppressing wire 16 is extended from the first end E1 that is the base end of the second sheath 12 to the operation unit 3 described later.
Here, before describing the shape of the first end E1 of the second sheath 12, the schematic configuration of the operation unit 3 will be described.

As shown in FIG. 2, the operation unit 3 is disposed at the proximal end portion of the insertion unit 2. The operation unit 3 is provided for operating the balloon 14 and the knife wire 10.
The operation unit 3 includes an operation unit main body 20 (sheath holding unit), a base unit 22, a fixture 26, a slider 21, and a plug 25.

  The operation portion main body 20 has a distal end cylindrical portion 20a (cylindrical portion) on the distal end side and a slide guide portion 20f on the proximal end side. In the operation unit main body 20, a base part 22, a connector 23, and a fixture 26 are arranged at an intermediate part between the distal cylindrical part 20 a and the slide guide part 20 f.

The distal end tubular portion 20 a is formed in a tubular shape having a hole for inserting the proximal end portion of the insertion portion 2. As will be described later, the first end E1 of the second sheath 12 is fixed to the hole of the distal tubular portion 20a.
The slide guide portion 20f holds a slider 21 described later so as to be slidable. As shown in FIG. 3, a slide hole 20n extending to the hole portion of the distal end tubular portion 20a is formed in the slide guide portion 20f.

  A discharge port of a pressurizer 120 that controls the expansion amount of the balloon 14 can be attached to the base portion 22 in a watertight manner. By attaching the pressurizer 120 to the base portion 22, a fluid for inflating the balloon 14 can be introduced into the balloon 14 from the pressurizer 120.

  The connector 23 is a luer lock connector, for example, and communicates with the third lumen 12c of the second sheath 12 via a flow path (not shown). A later-described syringe 126 (see FIG. 35) for supplying a contrast agent can be attached to the connector 23.

The fixture 26 is a member that detachably fixes the operation unit 3 to the pressurizer 120. In this embodiment, the fixture 26 is formed in a C-shape that can be locked to the outer periphery of the pressurizer 120 on the side surface of the operation unit main body 20.
The operation unit body 20 and the fixture 26 have a rigidity that does not substantially deform when a force for operating the slider 21 and the pressurizer 120 described below is applied to the slider 21 and the pressurizer 120.
The operation unit main body 20 and the fixture 26 may be formed by integral molding of synthetic resin, or may be formed by a combination of molded parts of synthetic resin.
In the present embodiment, the fixing tool 26 can be attached to and detached from the pressurizer 120 and can be selectively attached to and detached from either the pressurizer 120 or an endoscope 130 described later.
That is, the fixture 26 can also be used for fixing the treatment instrument 1 to the endoscope when the pressurizer 120 is not used.

  When the fixing device 26 is fixed to the pressurizer 120, the fixture 26 is disposed at a position where the compliance display of the balloon 14 and the display of the pressure of the pressurizer 120 are visible at the same time.

As shown in FIG. 2, the slider 21 is an operation part that moves the knife wire 10 forward and backward in the direction of the central axis of the knife wire 10. The slider 21 is movably attached to the slide guide portion 20f. The slider 21 is made of an insulating material.
An operation rod 24 that connects the slider 21 and the proximal end portion of the knife wire 10 is fixed to the slider 21.
As shown in FIG. 3, the operation rod 24 is slidably inserted into the slide hole 20 n in the operation unit main body 20.
A knife wire 10 extending from the second sheath 12 to the proximal end side is connected to the distal end portion of the operation rod 24. For this reason, when the operator slides the slider 21 along the slide guide portion 20f, the knife wire 10 inserted into the insertion portion 2 can be advanced and retracted on the proximal end side. For this reason, the operator can stretch or loosen the knife wire 10 exposed to the outside of the first sheath 11 in the distal end side insertion portion 2A.
The operating rod 24 is made of a conductor and electrically connects the knife wire 10 and a plug 25 described later.

  The plug 25 is a conductor fixed to the slider 21. The plug 25 is fixed to the proximal end portion of the knife wire 10 via the operation rod 24. The plug 25 and the knife wire 10 are electrically connected via the operation rod 24. The plug 25 can be connected to a later-described high-frequency power supply device 128 (see FIG. 50) that supplies a high-frequency current to the knife wire 10.

A guide wire insertion opening 20 b formed in the distal end cylindrical portion 20 a is provided in the insertion portion 2 in order to insert the guide wire from the operation portion 3. However, the guide wire insertion opening 20b is not provided only for inserting the guide wire. The guide wire insertion opening 20b can also be used as an opening for the guide wire proximal end to protrude outward from the guide wire lumen when the guide wire proximal end is inserted from the distal end of the guide wire lumen.
As shown in FIGS. 11 and 12, the guide wire insertion opening 20b includes a slit 20c (second slit) and a main opening 20d.

The slit 20c extends along the central axis O20a (see FIG. 12) of the distal tubular portion 20a on the side surface of the distal tubular portion 20a and penetrates in the radial direction. The slit 20c opens to the distal end surface of the distal cylindrical portion 20a and the inner peripheral portion of the main opening 20d in the extending direction.
As shown in FIG. 13, the gap width W of the slit 20 c is narrower than the slit 12 e of the second sheath 12 and wider than the outer diameter of the guide wire 30.

As shown in FIG. 12, the main opening 20d is a substantially rectangular opening that is long in the direction along the central axis O20a when viewed from the radial direction. The main opening tip surface 20k, which is the wall surface on the tip side on the inner peripheral surface of the main opening 20d, is a plane orthogonal to the central axis O20a.
The opening width in the short direction of the main opening 20d is wider than the gap width of the slit 20c. The slit 20c opens at the center of the main opening tip surface 20k on the tip side (the left side in the figure) of the main opening 20d.
A pair of guide portions 20j protruding inward from the inner peripheral portion in the short direction of the main opening 20d are opposed to the front end side of the main opening 20d in the circumferential direction. The slit 20c is formed by the end surface in the circumferential direction of each guide portion 20j.
As shown in FIG. 13, each guide portion 20j is curved in an arc shape along the cylindrical shape of the tip cylindrical portion 20a when viewed from the axial direction. In the distal end tubular portion 20a, the cross-sectional shape orthogonal to the axial direction on the distal end side from the guide wire insertion opening 20b is a C-shape.

As shown in FIGS. 11 to 14, the first end E1 of the second sheath 12 is inserted into the inner peripheral surface 20m (see FIGS. 13 and 14) of the distal end tubular portion 20a.
As shown in FIGS. 15 and 16, at the first end E <b> 1 of the second sheath 12, the side portion of the second sheath 12 is notched to form an opening OP. The inner peripheral surface of the first lumen 12a is exposed inside the opening OP.
When viewed from the radial direction, the opening OP is surrounded by a pair of exposed surfaces Sf and exposed surfaces Sg, Sh in a substantially U shape.

The pair of exposed surfaces Sf extends from the axial end surface 12k on the proximal end side of the second sheath 12 in the longitudinal direction of the first lumen 12a toward the distal end side. The pair of exposed surfaces Sf extend parallel to each other with the exposed portion of the first lumen 12a interposed therebetween.
In the present embodiment, the pair of exposed surfaces Sf is a plane that is equidistant from the central axis O12.
In the present embodiment, as shown in FIG. 13, the pair of exposed surfaces Sf is formed at a position passing through the approximate center (including the case of the center) of the first lumen 12a. The distance from each exposed surface Sf to the outer peripheral surface of the second sheath 12 that is outside the fourth lumen 12 d is a distance h that is longer than the radius of the second sheath 12. In the present embodiment, each exposed surface Sf extends substantially in parallel (including a parallel case) with the second lumen 12b and the third lumen 12c.

  As shown in FIG. 16, the exposed surfaces Sg and Sh have a V shape having a top on the central axis O12 when viewed from the radial direction. The exposed surfaces Sg and Sh are flat surfaces extending from the outer peripheral surface of the second sheath 12 where the slits 12e are formed toward the exposed surface Sf. In the present embodiment, the exposed surfaces Sg and Sh are both planes orthogonal to the exposed surface Sf. In the present embodiment, when viewed from the radial direction passing through the center of the slit 12e, the exposed surfaces Sg and Sh, as an example, intersect with the central axis O12 at about 45 ° (including 45 °). To do.

  Each exposed surface Sf is formed by an axial cut surface 12f, and the exposed surfaces Sg and Sh are formed by a first side cut surface 12g and a second side cut surface 12h.

The axial cut surface 12f is a surface formed by cutting from the end surface 12k in a direction substantially parallel to the central axis O12, the second lumen 12b, and the third lumen 12c, passing through the approximate center of the first lumen 12a.
The axial cut surface 12f is formed as two surfaces facing each other when cutting is performed. However, as described later, when all the cuts are completed, the axial cut surface 12f facing the exposed surface Sf is removed.

As shown in FIG. 16, the first side cut surface 12g and the second side cut surface 12h intersect the second sheath 12 in an X shape as seen from the radial direction passing through the center of the slit 12e. In addition, it is a cut surface that reaches a position on the same plane as the axial cut surface 12f.
When viewed from the radial direction passing through the center of the slit 12e, the first side cut surface 12g and the second side cut surface 12h are located at a position slightly proximal to the distal end portion of the axial cut surface 12f. It intersects in an X shape at a point P on the axis O12.
The first side cut surface 12g and the second side cut surface 12h intersect each central axis O12 at about 45 ° when viewed from the radial direction passing through the center of the slit 12e.
The first side cut surface 12g (second side cut surface 12h) is formed as two surfaces facing each other when cutting is performed. However, as will be described later, when all the cuts are completed, the first side cut surface 12g (second side cut surface 12h) facing the exposed surface Sg (Sh) is removed.

For this reason, in the present embodiment, the first side cut surface 12g (second side cut surface 12h) that forms two surfaces facing each other is formed on the distal end side of the second sheath 12 from the point P. The
The axial cut surface 12f that forms two opposed surfaces is formed in a region from the position where the axial cut surface 12f intersects the exposed surfaces Sg and Sh to the tip in the cutting direction of the axial cut surface 12f.
When cutting with a cutter, the cutting edge of the cutter often performs a combination of movement parallel to the cutting edge and movement perpendicular to the cutting edge. The “cutting direction” in this specification means a direction orthogonal to the cutting edge among the movement directions of the cutting edge when cutting.
As described above, the distal end portion of the axial cut surface 12f is positioned on the distal end side with respect to the position where the exposed surface Sg intersects, so that the triangular piece having the exposed surface Sg and the axial cut surface 12f on the outer edge is provided. 12j (first piece-like portion) is formed. Similarly, the distal end portion of the axial cut surface 12f is positioned on the distal end side with respect to the position of intersection with the exposed surface Sh, so that the triangular piece 12i having the exposed surface Sh and the axial cut surface 12f at the outer edge is provided. (Second piece-like portion) is formed.

  As shown in FIG. 12, the first end E1 of the second sheath 12 having such a configuration has a distal cylindrical portion 20a so that the slit 12e is positioned at the center of the slit 20c when viewed from the radial direction. Inserted into. The position of the first end E1 in the axial direction is such that the first side cut surface 12g and the second side cut surface 12h are on the tip side of the main opening tip surface 20k (see FIGS. 12 and 14).

As shown in FIGS. 11 and 12, a cut surface fixing member (opening fixing member) 1010 is provided on the proximal end side of the main opening 20d.
As shown in FIG. 17 to FIG. 19, the cut surface fixing member 1010 has a bottom surface 1011 that touches a pair of exposed surfaces Sf, side surfaces 1012 on both sides engage with a side surface 20da of the main opening 20d, and a top surface 1013 on the base end side. Is engaged with the inner peripheral surface 20m of the distal cylindrical portion 20a, so that the opening OP is fixed so as not to be displaced in the circumferential direction from the guide wire insertion opening 20b.
Furthermore, a distance (T1 + h) obtained by adding a distance T1 between the bottom surface 1011 and the top surface 1013 of the cut surface fixing member 1010 and a distance h between the exposed surface Sf and the outer periphery of the sheath opposite to the exposed surface Sf is the distal end cylindrical portion 20a before assembly. If it is set so as to be larger than the diameter Da, the compression force can always be applied to the exposed surface Sf, so that the fixing becomes more reliable.
Further, as shown in FIGS. 11 and 12, at the tip of the cut surface fixing member 1010, an inclined portion 20 e that inclines from the outer peripheral portion of the distal end tubular portion 20 a toward the inside as it goes from the proximal end side to the distal end side. Is formed. The distal end of the inclined portion 20e extends into the groove of the guide wire lumen 12a exposed at the opening OP, and the guide wire 30 (see FIG. 13) extends from the proximal end side toward the distal end side with respect to the main opening 20d. This is a part for guiding the insertion posture of the guide wire 30 so as to facilitate the insertion.
Further, even when the proximal end of the guide wire 30 is inserted from the distal end opening of the guide wire lumen 11a of the first sheath 11 at the distal end of the inclined portion 20e, the proximal end of the guide wire 30 extends from the guide wire insertion opening 20b. Guide to make it easier to go outside.

As shown in FIG. 20, the second sheath 12 is fixed to the operation unit main body 20 via a fixing member 19.
The fixing member 19 is a cylindrical member having a distal end portion fitted in the fourth lumen 12 d and a proximal end portion locked to the operation portion main body 20. The inner diameter of the through hole 19 a penetrating the fixing member 19 in the axial direction is larger than the outer diameter of the elongation suppressing wire 16.
On the outer peripheral surface of the distal end portion of the fixing member 19, an engagement protrusion 19b that bites into the inner peripheral surface of the fourth lumen 12d protrudes radially outward.
At the base end portion of the fixing member 19, a cylindrical base end side cylindrical portion 19d is formed.

A locking portion 19c that locks the end surface 12k on the outer peripheral side of the fourth lumen 12d in the second sheath 12 in the axial direction protrudes radially outward from the intermediate portion of the fixing member 19 in the axial direction.
The fixing member 19 is connected to the second sheath 12 by inserting the distal end portion from the proximal end side of the fourth lumen 12d and pushing it until the end surface 12k contacts the locking portion 19c. The outer diameter of the fixing member 19 is slightly larger than the fourth lumen 12d. The locking portion 19c and the end surface 12k are in close contact with each other. For this reason, the fixing member 19 is attached to the fourth lumen 12d in a watertight manner.

Inside the operation unit main body 20, a locking hole portion in which a proximal end side tubular portion 19 d of the fixing member 19 is fitted in a watertight manner at a distal end portion (left side in the drawing) of a liquid feeding conduit 20 g communicating with the base portion 22. 20i is provided. The inner diameter of the locking hole 20i is larger than the inner diameter of the liquid feeding pipe line 20g. For this reason, a level | step difference is formed in the proximal end side of the latching hole part 20i between the liquid feeding pipe lines 20g. This level | step difference latches the end surface 19e of the base end side cylindrical part 19d of the fixing member 19 to an axial direction.
In this way, the fourth lumen 12d communicates with the inside of the liquid feeding pipe line 20g and the base part 22, so that a fluid is introduced into the liquid feeding space S1 through the base part 22 or the fourth lumen 12d is placed in the liquid feeding space S1. Fluid can be discharged.

The elongation suppressing wire 16 inserted through the fourth lumen 12d passes through the through hole 19a of the fixing member 19 and extends into the liquid feeding conduit 20g.
A through-hole 20h through which the elongation suppressing wire 16 is inserted is formed in the liquid feeding conduit 20g. The proximal end portion of the elongation suppressing wire 16 is inserted into the through hole 20h. The proximal end portion of the elongation suppressing wire 16 is fixed to the wall surface through which the through hole 20 h passes through the fixing portion 18.
The fixing portion 18 fixes the position of the elongation suppressing wire 16 and seals the through hole 20h in a watertight manner.

  As shown in FIG. 3, in the treatment instrument 1, the distal end portion of the elongation suppressing wire 16 is fixed to the fixed tube 17, and the proximal end portion of the elongation suppressing wire 16 is fixed to the operation unit main body 20. For this reason, the elongation suppressing wire 16 is arranged in parallel with the first sheath 11 and the second sheath 12 in the communication space by the liquid feeding space S1 and the fourth lumen 12d. Since the elongation suppressing wire 16 is made of a metal wire, it has higher tensile rigidity than the first sheath 11 and the second sheath 12. For this reason, when the insertion portion 2 is pulled in a range in which the elongation suppressing wires 16 run side by side, the axial rigidity of the insertion portion 2 is suppressed by the tensile rigidity of the elongation suppressing wires 16.

Next, a method for manufacturing the treatment instrument 1 will be described focusing on a method for manufacturing the second sheath 12.
FIG. 21 is a perspective view illustrating a process of manufacturing the endoscope treatment tool according to the first embodiment of the present invention. FIG. 22 is a process explanatory view in plan view of the manufacturing process of the endoscope treatment tool according to the first embodiment of the present invention. 23 is a cross-sectional view taken along line JJ in FIG. FIG. 24 is a perspective view illustrating a process of manufacturing the endoscope treatment tool according to the first embodiment of the present invention. FIG. 25 is a process explanatory view in plan view of the manufacturing process of the endoscope treatment tool according to the first embodiment of the present invention. 26 is a cross-sectional view taken along the line KK in FIG. FIG. 27 is a perspective process explanatory view of the manufacturing process of the endoscope treatment tool according to the first embodiment of the present invention. FIG. 28 is a perspective view illustrating a process of manufacturing the endoscope treatment tool according to the first embodiment of the present invention. FIG. 29 is a plan view of the U view in FIG. 30 is a cross-sectional view taken along line LL in FIG.

As shown in FIG. 21, in order to manufacture the second sheath 12, the multi-lumen tube 32 in which the first lumen 12a, the second lumen 12b, the third lumen 12c, and the fourth lumen 12d are formed is manufactured.
Next, the first side cut surface 12g, the second side cut surface 12h, and the axial cut surface 12f are provided at the end of the multi-lumen tube 32 that becomes the first end E1 of the second sheath 12. Process to form.
First, as shown in FIG. 21, the multi-lumen tube 32 is horizontally arranged so that the first lumen 12a is on the upper side and the fourth lumen 12d is on the lower side, and the cored bar 101 is inserted into the first lumen 12a. .

The cored bar 101 abuts on the innermost peripheral surface of the first lumen 12a by its own weight. The cored bar 101 is inserted to a position further to the back than the position where the first side cut surface 12g and the second side cut surface 12h intersect.
The cored bar 101 is a member that regulates the cut amount of the cutter 100 that forms the first side cut surface 12g and the second side cut surface 12h.

First, in order to form the first side cut surface 12g, the cutter 100 performs cutting in the cutting direction from the outer peripheral side facing the first lumen 12a toward the multi-lumen tube 32.
At this time, the posture of the cutter 100 is a posture in which the cutting edge 100a is disposed horizontally and the cutting direction is along the vertical direction. Further, the posture of the cutter 100 in a plan view with respect to the multi-lumen tube 32 is inclined by an angle θ with respect to the central axis O32 of the multi-lumen tube 32 as shown in FIG. The angle θ is equal to the inclination angle between the first side cut surface 12g of the second sheath 12 and the central axis O12. In the present embodiment, the angle θ is about 45 °.

When such a cutting operation is performed, as shown in FIG. 23, the cutter 100 cuts the multi-lumen tube 32 and forms a first side cut surface 12g at the cut portion. However, when the cutting edge 100a of the cutter 100 abuts against the cored bar 101, it cannot be cut further. For this reason, the 1st side part cutting surface 12g stops at the position of the blade edge | tip 100a.
At this time, the cutting edge 100a can be positioned on the horizontal plane where the distance from the outer peripheral surface is h on the side opposite to the first lumen 12a by appropriately setting the outer diameter of the cored bar 101.
In this state, the cutting edge 100a is at a position equidistant from the centers of the second lumen 12b and the third lumen 12c.
When the cutting edge 100a comes into contact with the metal core 101, the cutter 100 is pulled out.

Next, as shown in FIGS. 24 and 25, the cutter 100 is rotated around the vertical axis and is inclined to the opposite side with respect to the central axis O32 (see FIG. 20) of the multi-lumen tube 32 by an angle θ. Cut into multi-lumen tube 32. At this time, the cutter 100 cuts into a position that intersects at the center of the first side cut surface 12g.
As shown in FIG. 26, the cutter 100 is cut until the cutting edge 100a comes into contact with the core metal 101 as described above. When the cutting edge 100a comes into contact with the metal core 101, the cutter 100 is pulled out.
As a result, the second side cut surface 12h is formed.

In this way, as shown in FIG. 27, on the side surface of the multi-lumen tube 32, when viewed from the radial direction, the first side cut surface 12g and the second side cut that intersect in an X shape at the point P A surface 12h is formed.
In the present embodiment, the first side cut surface 12g and the second side cut surface 12h penetrate the upper half of the first lumen 12a.

Next, the axial cut surface 12f is formed.
The cutter 100 is disposed on the upper portion of the cored bar 101 extended from the multi-lumen tube 32. Next, as shown in FIGS. 28 to 30, the cutter 100 is cut from the end face 12 k with the direction along the central axis of the multi-lumen tube 32 as the cutting direction.
At this time, the cutting edge 100a of the cutter 100 maintains a posture orthogonal to the central axis O32 of the multi-lumen tube 32 (see FIG. 29).
Further, the cutter 100 abuts on the core metal 101 from above and moves horizontally with the core metal 101 as a guide. By such a cutting operation of the cutter 100, the axial cutting surface 12f is formed from the end surface 12k along a horizontal plane parallel to the central axis O32.
By such a cutting operation, the end of the multi-lumen tube 32 is divided into two with the axial cutting surface 12f as a boundary. The two parts to be divided are connected on the tip side of the blade edge 100a as long as they do not intersect with either the first side cut surface 12g or the second side cut surface 12h.

However, when the cutting edge 100a passes through the first side cut surface 12g and the second side cut surface 12h closest to the end surface 12k, the axial cut surface 12f becomes the first side cut surface 12g and the second side cut surface 12g. Intersects the lower end of the side cut surface 12h.
For this reason, the cutting part 32B above the cutter 100 is separated from the tube main body part 32A.
When the cutter 100 is moved to a position intersecting the first side cut surface 12g and the second side cut surface 12h on the more distal end side, the number of cut portions is further increased. However, in this embodiment, the cutting operation is stopped when the cutting edge 100a of the cutter 100 moves slightly to the tip side from the point P as seen from the radial direction so as not to occur.
As shown in FIG. 29, when viewed from the radial direction, the first side cut surface 12g, the second side cut surface 12h, and the axial cut surface 12f overlap each other in a piece-like portion 12j, 12i. Is formed.
Next, the cutter 100 and the cored bar 101 are removed.

When the cut portion 32B is removed, the multi-lumen tube 32 remains the tube main body portion 32A with the side portions cut away. In the tube main body 32A, the first side cut surface 12g and the second side cut surface 12h closer to the end surface 12k than the point P are exposed to form exposed surfaces Sg and Sh.
Furthermore, an exposed surface Sf is formed in the tube main body portion 32A by exposing the axial cut surface 12f between the exposed surfaces Sg, Sh and the end surface 12k.
As viewed from the radial direction, the first lumen 12a is exposed and an opening OP is formed in a region surrounded by the exposed surfaces Sg, Sh, Sf in a substantially U shape.

In this way, the first side cut surface 12g, the second side cut surface 12h, and the axial cut surface 12f are formed, thereby forming the tube body portion 32A with the side portions cut away. The
Next, the slit 12e is processed along the central axis O32 from the point P of the tube main body portion 32A that is the intersection of the first side cut surface 12g and the second side cut surface 12h. The processing method of the slit 12e is not particularly limited. For example, it can be processed using a cutter having two cutting edges separated by a gap width of the slit 12e.
In this way, when the slit 12e is formed over the entire length of the tube main body portion 32A, the second sheath 12 is formed.

Such a 2nd sheath 12 is connected with the 1st sheath 11 via the connection tube 13 in the 2nd end part E2, and penetrates the knife wire 10 inside.
Further, the fixed tube 17 is inserted into the first sheath 11, and the elongation suppressing wire 16 on the proximal end side of the fixed tube 17 is inserted into the fourth lumen 12 d of the second sheath 12.
Further, the second end E2 of the first sheath 11 and the second sheath 12 is inserted into the balloon 14 and the balloon tube 15, and the balloon 14 and the balloon tube 15 are fixed to the first sheath 11 and the second sheath 12.

At the first end E1 of the second sheath 12, the fixing member 19 is fitted to the fourth lumen 12d, and the first end E1 of the second sheath 12 is inserted into the distal tubular portion 20a together with the fixing member 19. . The second sheath 12 is held by the operation portion main body 20 that is a sheath holding portion.
The opening OP of the second sheath 12 is aligned with the guide wire insertion opening 20 b of the second sheath 12, and the elongation suppressing wire 16 extending from the fixing member 19 is fixed to the operation unit main body 20.
The knife wire 10 extending from the first lumen 12 a is fixed to the operation rod 24.
In this way, the treatment tool 1 is manufactured.

Next, the action of the treatment instrument 1 will be described focusing on the action in the guide wire 30 insertion operation.
FIG. 31 and FIG. 32 are operation explanatory views in plan view of the endoscope treatment tool according to the first embodiment of the present invention. 33 and 34 are cross-sectional views illustrating the operation of the endoscope treatment tool according to the first embodiment of the present invention.

In order to insert the guide wire 30 into the patient's body through the treatment instrument 1, it is necessary to insert the guide wire 30 into the first lumen 12a.
As shown in FIG. 31, in the treatment instrument 1, the guide wire 30 can be inserted from the guide wire insertion opening 20 b of the operation unit 3.
The operator inserts the distal end of the guide wire 30 into the guide wire insertion opening 20b along the not-shown inclined portion 20e of the guide wire 30.
At this time, as shown in FIG. 32, when the operator inserts the distal end portion of the guide wire 30 between the exposed surface Sf seen from the guide wire insertion opening 20b and the guide portion 20j of the distal tubular portion 20a, The guide wire 30 can be inserted smoothly.

When the guide wire 30 is inserted between the exposed surface Sf and the guide portion 20j, the guide portion 20j prevents the guide wire 30 from coming off radially outward.
When the operator pushes in the guide wire 30, the tip 30a of the guide wire 30 comes into contact with the exposed surface Sg or the exposed surface Sh. FIG. 32 shows an example in which the tip 30a contacts the exposed surface Sg.
At this time, in the present embodiment, since the second sheath 12 has four lumens, as shown in FIG. 13, the exposed surface Sg is a portion wider than the outer diameter of the guide wire 30 when viewed from the axial direction. So that most of the tip 30a of the guide wire 30 overlaps the exposed surface Sg.

However, when viewed from the radial direction, the exposed surface Sg is inclined with respect to the central axis O12 as shown in FIG. For this reason, since the tip 30a of the guide wire 30 does not come into full contact with the exposed surface Sg, a large frictional force that prevents the guide wire 30 from moving does not act. Furthermore, since the exposed surface Sg is inclined obliquely with respect to the insertion direction of the guide wire 30, the tip 30a of the guide wire 30 is viewed from the radial direction along the central axis O12 along the inclination of the exposed surface Sg. It can move smoothly in the direction approaching.
When the distal end 30a of the guide wire 30 moves in a direction approaching the central axis O12 when viewed from the radial direction, it moves to the inside of the first lumen 12a as shown by a distal end 30a ′ indicated by a two-dot chain line in FIG. As a result, the guide wire 30 is inserted into the first lumen 12a.
Since the guide wire 30 has an outer diameter larger than the gap width w of the slit 12e, once the distal end portion of the guide wire 30 enters the first lumen 12a, the distal end side does not come out of the first lumen 12a. It will be inserted into.

  On the other hand, if the exposed surfaces Sg and Sh are in a positional relationship orthogonal to the central axis O12, for example, the problem described above in “Problems to be solved by the device” occurs. For example, in the above-described treatment instrument 241, as shown in FIG. 80, the distal end portion 230 a of the guide wire 230 is easily caught in a state where it cannot be moved forward by being caught by the side cut surface 242 g. Sex worsens.

  Thus, according to the treatment instrument 1, even when the guide wire 30 is displaced from the guide wire lumen when the guide wire 30 is inserted, the first side cut surface 12g and the second side intersecting in an X-shape. The guide wire 30 moves along the partial cut surface 12h. For this reason, according to the treatment instrument 1, when the multi-lumen sheath is provided, the guide wire can be easily inserted into the guide wire lumen.

  Furthermore, in the treatment instrument 1, since the axial cut surface 12f is formed so as to intersect the first side cut surface 12g and the second side cut surface 12h, the strips 12j and 12i are formed. . The piece-like portions 12j and 12i are formed by the first side cut surface 12g and the second side cut surface 12h at the outer edges, the axial cut surface 12f and the second side cut surface, which are continuous with the exposed surface Sf. It faces 12h.

For example, as shown in FIG. 33, after the guide wire 30 is inserted without coming into contact with the piece-like portion 12i, an external force acts on the guide wire 30 as shown in FIG. May be pulled outward in the direction.
In this case, when the guide wire 30 is pulled outward and the piece-like portion 12i receives an external force radially outward, the first side cut surface 12g at the outer edge of the piece-like portion 12i continues to the exposed surface Sf. It moves in a direction away from the axial cut surface 12f.
For this reason, since the reaction force which acts on the guide wire 30 from the piece-like part 12i reduces, the load at the time of inserting the guide wire 30 is reduced.
Also in this respect, the workability of the guide wire 30 insertion work is improved.
Such an action of the piece-like portion 12i is the same when the guide wire 30 is pulled out to the proximal end side.
Although not specifically described, the piece-like portion 12j has exactly the same action as the piece-like portion 12i.

  Further, the strips 12i and 12j are not only deformed in a direction away from the axial cut surface 12f continuous with the exposed surface Sf, but can also be deformed to move in a direction along the axial cut surface 12f. For this reason, even when the piece portions 12i and 12j receive an external force from the guide wire 30 in the direction along the axial cut surface 12f, the reaction force to the guide wire 30 is reduced.

Furthermore, in the treatment instrument 1, since the first lumen 12a is made of resin, the slit 12e is deformed when a force is applied to the guide wire 30 inserted therein. For this reason, the guide wire 30 can be pulled out through the slit 12e. For example, the guide wire 30 extending outward from the guide wire insertion opening 20b is moved toward the slit 20c. The guide wire 30 moves to the opening of the slit 12e along the V-shaped portion formed by the exposed surfaces Sg and Sh.
Further, when the operator applies a force and pulls the guide wire 30 radially outward and on the distal end side, the guide wire 30 enters between the slit 12e and the slit 20c. At this time, since the gap width W of the slit 20c is larger than the outer diameter of the guide wire 30, the guide wire 30 does not contact the highly rigid slit 20c.
On the other hand, since the slit 12e has low rigidity, when the guide wire 30 is inserted, the gap width is widened and the guide wire 30 can be pulled out.

In this way, the operator can extend the guide wire 30 to the outside from any position where the slit 12e is provided in the longitudinal direction of the treatment instrument 1.
In this case, since the surgeon located near the patient can operate the insertion of the guide wire 30 at hand, the operability of the guide wire 30 is improved.
In addition, even if the second sheath 12 is twisted and rotated during use, the cut surface fixing member 1010 fixes the direction of the opening OP with respect to the guide wire insertion opening 20b, so that it becomes difficult to insert the guide wire. There is nothing.
Further, since the cut surface fixing member 1010 has the inclined portion 20e, when the proximal end of the guide wire 30 is inserted from the distal end of the guide wire lumen 11a of the first sheath 11, the proximal end of the guide wire 30 is easily provided. It can protrude outside from the guide wire insertion opening 20b.

Next, the usage method of the treatment tool 1 of this embodiment is demonstrated.
FIG. 35 to FIG. 57 are schematic views showing one process during use of the endoscope treatment tool according to the first embodiment of the present invention.

In the following, with respect to the method of using the treatment tool 1, by using the treatment tool 1, a series of treatments including retrograde cholangiography, incision of the duodenal papilla PV, and expansion of the duodenal papilla PV are performed, and stones can be removed. explain.
First, as shown in FIG. 35, after preparing for air bleeding or the like of the balloon 14, the treatment instrument 1 and the pressurizer 120 are coupled to the base portion 22 via the connection tube 123. The pressurizer 120 contains an expansion liquid composed of a mixed liquid of contrast medium and physiological saline.
Next, a syringe 126 for injecting a contrast agent is attached to the connector 23. The inside of the syringe 126 for injecting the contrast medium is filled with the contrast medium. The syringe 126 and the connector 23 are connected in a watertight manner, and the contrast agent can be discharged from the distal end of the insertion portion 2 through the third lumen 12c and the third lumen 11c by pushing out the contrast agent from the syringe 126.
The cylinder 121 of the pressurizer 120 has its outer peripheral portion held by the fixture 26 of the treatment instrument 1, and the positional relationship with the treatment instrument 1 is fixed.
In order to further increase the fixing force by the fixing tool 26, as shown in FIG. 36, both ends of the fixing tool 26 may be tightened with an elastic band 26A.

Next, a guide wire 30 for guiding the distal end of the treatment tool 1 to the treatment target site is prepared. As shown in FIG. 37, the guide wire 30 is inserted into the proximal end portion of the insertion portion 2 from the guide wire insertion opening 20 b of the operation portion 3.
At this time, the insertion operation of the guide wire 30 and the action of the second sheath 12 at the time of insertion are as described above.
The guide wire 30 is inserted into the first lumen 12a of the second sheath 12 (not shown) through the guide wire insertion opening 20b, and to the opening on the distal end side (tip side) of the first lumen 11a of the first sheath 11. It is sent.

Next, as shown in FIG. 38, the insertion portion 2 of the treatment instrument 1 is inserted into the treatment instrument channel 131 of the endoscope 130 from the distal side.
When the distal end of the insertion portion 2 of the treatment instrument 1 protrudes from the distal end of the treatment instrument channel 131 of the endoscope 130, the distal end of the treatment instrument 1 is controlled by the operation of the endoscope 130 and the operation of the treatment instrument 1. Insert the end into the duodenal papilla PV.

  As a technique for inserting the distal end of the treatment tool 1 into the duodenal papilla PV, a guide wire 30 may be used. As shown in FIG. 39, the tube inside the duodenal papilla PV may be bent rarely. In such a duodenal papilla PV, the distal end of the insertion portion 2 of the treatment instrument 1 has a bent lumen extending from the duodenal papilla PV to the bile duct only by aligning the insertion portion 2 of the treatment instrument 1 and the bile duct. There is a case where it is difficult to insert the insertion portion 2 up to the bile duct because it hits the bent portion X (see FIG. 40).

When the distal end of the insertion portion 2 of the treatment instrument 1 hits the bent portion of the bent lumen from the duodenal papilla PV to the bile duct, as shown in FIG. 41 and FIG. Using the guide wire 30 having a flexible distal end, the guide wire 30 is first inserted from the duodenal papilla PV toward the bile duct.
As a specific operation, the guide wire 30 is slightly protruded from the distal end of the treatment instrument 1 with the distal end of the insertion portion 2 of the treatment instrument 1 positioned at the entrance of the duodenal papilla PV (see FIG. 42). . In this state, the proximal end portion of the guide wire 30 is gently moved back and forth or rotated to cause the flexible distal end of the guide wire 30 to follow the bending in the duodenal papilla PV. As a result, the guide wire 30 can advance to the bile duct side beyond the bending of the duodenal papilla PV (see FIG. 43). Thereby, the guide wire 30 for guiding the treatment tool 1 is installed in the duodenal papilla PV before the treatment tool 1 is inserted into the duodenal papilla PV. Thereafter, the insertion portion 2 of the treatment instrument 1 can be inserted along the guide wire 30 to the back of the duodenal papilla PV (see FIG. 44).

As shown in FIG. 45, in the second sheath 12 of the insertion portion 2, a slit 12 e having a width slightly smaller than the outer diameter of the guide wire 30 is formed in a first lumen 12 a (not shown) that is a guide wire lumen. It is formed.
Since the second sheath 12 is formed of a resin material, it can be elastically deformed, and the guide wire 30 can be pulled out from the slit 12e by elastically deforming the second sheath 12. For example, the position where the guide wire 30 is pulled out of the second sheath 12 can be moved to the guide wire operation position Q in the vicinity of the forceps plug 173 of the endoscope 130. In this case, it becomes easy for the user who operates the endoscope 130 to operate (push in, pull back, etc.) the guide wire 30.
Further, when the procedure is started only with the treatment instrument 1 and the guide wire 30 is desired to be inserted from the guide wire insertion opening 20b on the way, the slit 12e is smaller than the outer diameter of the guide wire 30, so that the guide wire 30 is slit 12e. There ’s no way to go outside. For this reason, the guide wire 30 can be inserted up to the distal end of the treatment instrument 1.

When the insertion part 2 of the treatment instrument 1 is inserted into the bile duct, as shown in FIG. 46, the contrast medium is filled into the bile duct from the syringe 126 attached to the operation part 3. As shown in FIG. 47, when the bile duct is imaged and the calculus Ca is confirmed, the distal end portion of the knife wire 10 is moved to the incision position of the duodenal papilla PV as shown in FIG. Further, as shown in FIG. 49, the connection cord 129 of the high frequency power supply device 128 is connected to the plug 25 of the operation unit 3.
When the high frequency power supply device 128 and the plug 25 are connected, the slider 21 of the operation unit 3 shown in FIG. 50 is operated, and the distal end portion of the knife wire 10 is slightly arched as shown in FIG. The papilla PV is brought into contact with the papilla PV, and a duodenal papilla PV is incised by applying a high-frequency current.

After incising the duodenal papilla PV using the knife wire 10, as shown in FIG. 52, the insertion portion 2 of the treatment instrument 1 is advanced until the longitudinal center of the balloon 14 comes to the entrance of the duodenal papilla PV.
Subsequently, as shown in FIGS. 53 and 54, in a state where the balloon 14 is located inside the duodenal papilla PV, the plunger 122 of the pressurizer 120 is advanced to expand the balloon 14.
When the duodenal papilla PV is expanded by the balloon 14, the plunger 122 of the pressurizer 120 is retracted as shown in FIG. 55, and the balloon 14 is deflated in the duodenal papilla PV as shown in FIG.

  Next, the treatment instrument 1 is pulled out from the treatment instrument channel 131 of the endoscope 130, and, as shown in FIG. 57, a quarrying basket 140 or the like is attached to the endoscope 130, and this basket 140 is attached from the duodenal papilla PV to the bile duct. Introduce and recover calculus Ca.

Here, the effect | action of the elongation suppression wire 16 in the treatment tool 1 is demonstrated.
FIG. 58 is a schematic diagram showing the operation of the balloon of the endoscope treatment tool according to the first embodiment of the present invention. In FIG. 58, (a-1) is a schematic perspective view showing an aspect when an unused balloon is reduced. Similarly, (a-2) is a schematic perspective view showing an aspect when the balloon is expanded. Similarly, (a-3) is a schematic perspective view showing an aspect when the balloon is contracted after being expanded. 58, (b-1), (b-2), and (b-3) are X1-X1 cross-sectional views in (a-1), X2-X2 cross-sectional views in (a-2), ( It is X3-X3 sectional drawing in a-3). FIG. 59 is a schematic diagram showing a process during use of the endoscope treatment tool according to the first embodiment of the present invention. FIG. 60 is a cross-sectional view for explaining the action of the extension suppressing wire of the endoscope treatment tool according to the first embodiment of the present invention.

As described above, the elongation suppressing wire 16 is arranged in parallel with the first sheath 11 and part of the knife wire 10 and the second sheath 12 inside the insertion portion 2. For this reason, when the insertion part 2 is pulled, the extension of the insertion part 2 is suppressed by the tensile rigidity of the extension suppression wire 16 in a range in which the extension suppression wires 16 run side by side.
As an example of the case where such pulling of the insertion portion 2 occurs, an example in which the balloon 14 is contracted and then the insertion portion 2 is pulled into the treatment instrument channel 131 of the endoscope 130 can be given.

  As shown in (a-1) and (b-1) in FIG. 58, the unused balloon 14 is reduced because the expansion fluid is not supplied into the balloon 14. The balloon 14 at this time is folded along the outer peripheral surface of the first sheath 11. The folded balloon 14 is positioned in a cylindrical range having a slightly larger diameter than the first sheath 11.

  As described above with reference to FIGS. 53 and 54, when the expansion liquid is introduced into the balloon 14 by the pressurizer 120, as shown in (a-2) and (b-2) of FIG. The balloon 14 is expanded.

As described above with reference to FIG. 55, when the expansion liquid is discharged from the inside of the balloon 14 by the pressurizer 120, the balloon 14 is contracted.
The balloon 14 at this time is reduced so that it is crushed in one direction in the radial direction, as shown in (a-3) and (b-3) in FIG. For this reason, the reduced balloon 14 includes, for example, a central portion 14A that is in close contact with the outer peripheral surface of the first sheath 11 and a pair of protruding piece portions that are in close contact with each other and protrude outward in the radial direction of the first sheath 11. It changes to a flat shape including 14B.

For example, as schematically shown in FIG. 59, the projecting piece 14B at the time of reduction is easily caught by the distal end opening 131a of the treatment instrument channel 131 in the endoscope 130 when being pulled out from the tube inside the duodenal papilla PV. It has become.
Since the projecting piece 14B is flexible, it is deformed when it is pulled out with a certain force and enters the treatment instrument channel 131. However, a tensile force acts on the entire insertion portion 2 until the projecting piece portion 14B completely enters the treatment instrument channel 131.

For example, as shown in FIG. 60 (a), in the treatment instrument 301 from which the extension suppressing wire 16 is removed from the treatment instrument 1, the length of the insertion portion 2 from the proximal end portion of the balloon 14 to the operation portion 3 is set to the second sheath. The length of 12 is L1. At this time, it is assumed that the balloon 14 is contracted and the projecting piece 14B is locked to the tip opening 131a.
From this state, when the operating portion 3 is pulled to the distal side (base end side), as shown in FIG. 60 (b), the second sheath 12 made of resin extends, and the length of the insertion portion 2 becomes L1 + ΔL. extend. However, since the knife wire 10 inserted into the second sheath 12 cannot extend like the second sheath 12, the knife wire 10 moves to the proximal end side by approximately ΔL. As a result, the knife wire 10 protruding outward from the first sheath 11 is drawn into the first sheath 11 and the first sheath 11 in the treatment section 4 is bent.
As shown in FIG. 59, in a state where the balloon 14 is locked to the distal end opening 131a, the knife wire 10 exposed from the first sheath 11 is located near the opening of the tube inside the duodenal papilla PV. The tissue in the body may be damaged by the deformation of the treatment section 4 or the movement of the knife wire 10.

On the other hand, the treatment tool 1 according to the present embodiment has an extension suppressing wire 16 inside the insertion portion 2. For this reason, as shown in FIG. 60C, even when the insertion portion 2 is pulled to the proximal end side in a state where the balloon 14 is locked to the distal end opening portion 131a, the stretch suppressing wire 16 resists the pulling force. Therefore, the extension of the insertion portion 2 hardly occurs, and the length of the insertion portion 2 remains L1.
As a result, since the knife wire 10 is not pulled toward the proximal end side, the shape of the treatment portion 4 and the amount of exposure of the knife wire 10 from the first sheath 11 do not change even when a tensile force is applied. For this reason, the tissue in the body is prevented from being damaged by the deformation of the treatment section 4 or the movement of the knife wire 10.

[Second Embodiment]
An endoscope treatment tool according to a second embodiment of the present invention will be described.
FIG. 61 is a schematic perspective view showing the configuration of the second end portion of the second sheath of the endoscope treatment tool according to the second embodiment of the present invention. FIG. 62 is a plan view of the V view in FIG. 63 is a cross-sectional view along line YY in FIG.

As shown in FIGS. 1 and 2, the treatment instrument 41 of the present embodiment includes a second sheath 42 (multi-lumen sheath) instead of the second sheath 12 of the treatment instrument 1 of the first embodiment.
Hereinafter, a description will be given centering on differences from the first embodiment.

As shown in FIGS. 61 to 63, the second sheath 42 has a second lumen 42b and a third lumen 42c instead of the second lumen 12b and the third lumen 12c of the second sheath 12 of the first embodiment. Is provided.
In FIG. 63, the second lumen 42b and the third lumen 42c are arranged in the same positional relationship as the second lumen 12b and the third lumen 12c. However, the arrangement position of the second lumen 42b and the third lumen 42c may be closer to the first lumen 12a in the opposing direction of the first lumen 12a and the fourth lumen 12d. In this case, in the second sheath 42, the area on the side of the fourth lumen 12d can be expanded. For example, fifth and sixth lumens may be provided in the region on the side of the fourth lumen 12d.

  Further, the second sheath 42 includes the exposed surfaces Sg, Sh, Sf, the axial cut surface 12f, the first side cut surface 12g, and the second side portion of the second sheath 12 of the first embodiment. Instead of the cut surface 12h, exposed surfaces sg, sh, sf, an axial cut surface 42f, a first side cut surface 42g, and a second side cut surface 42h are provided.

Exposed surfaces sg and sh are the same as the exposed surfaces Sg and Sh of the first embodiment, except that they are formed by a first side cut surface 42g and a second side cut surface 42h, which will be described later. It is a plane.
Since the exposed surface sf is formed by an axial cut surface 42f described later, the exposed surface sf is the same as the exposed surface Sf in the first embodiment except that the exposed surface sf is formed across the second lumen 42b and the third lumen 42c. It is a similar plane.

The axial cut surface 42f is formed at a position where the axial cut surface 12f intersects the first lumen 12a and does not intersect the second lumen 12b and the third lumen 12c, whereas the first lumen 12a. The third embodiment differs from the first embodiment in that it intersects with any of the third lumen 42c and the fourth lumen 12d.
The axial cut surface 42f is formed as two surfaces facing each other when cutting is performed. However, as will be described later, when all the cuts are completed, the axial cut surface 12f facing the exposed surface sf is removed.

As shown in FIG. 62, the first side cut surface 42g and the second side cut surface 42h are X at a point P with respect to the second sheath 42 as viewed from the radial direction passing through the center of the slit 12e. Crossing in a letter shape is the same as in the first embodiment.
However, in the first side cut surface 42g and the second side cut surface 42h, the portion closer to the end surface 12k intersects with the axial cut surface 42f so as to cross the first embodiment. Different from form.
The front end portions of the first side cut surface 42g and the second side cut surface 42h in the cut direction extend in an oblique direction intersecting the axial cut surface 42f, as indicated by broken lines in FIG. .

  The first side cut surface 42g (second side cut surface 42h) is formed as two surfaces facing each other when cutting is performed. However, like the first side cut surface 12g and the second side cut surface 12h of the first embodiment, the first side facing the exposed surface sg (sh) described later when all the cuts are completed. The partial cut surface 42g (second side cut surface 42h) is removed.

Therefore, in the present embodiment, the first side cut surface 42g (second side cut surface 42h) that forms two surfaces facing each other is formed on the distal end side of the second sheath 42 from the point P. The
The axial cut surfaces 42f that form two opposite surfaces are axial from the position that intersects the first side cut surface 42g that forms the exposed surface sg and the second side cut surface 42h that forms the exposed surface sh. It forms in the area | region to the front-end | tip part in the cutting direction of the cutting surface 12f.
As described above, the distal end portion of the axial cut surface 42f is positioned on the distal end side with respect to the position of intersection with the exposed surface sg, so that a triangular piece having the exposed surface sg and the axial cut surface 42f at the outer edge is provided. 42j is formed. Similarly, the distal end portion of the axial cut surface 42f is located on the distal end side with respect to the position where the exposed surface sh intersects, so that the triangular piece-like portion 42i having the exposed surface sh and the axial cut surface 42f at the outer edge. Is formed.

With such a configuration, as shown in FIG. 62, the first end E1 of the second sheath 42 is cut off at the side of the second sheath 42 so that the opening OP is the same as that of the first embodiment. It is formed. The inner peripheral surface of the first lumen 12a is exposed to the outside at the opening OP.
When viewed from the radial direction, the opening OP in the present embodiment is surrounded by a pair of exposed surfaces sf composed of two strips and exposed surfaces sg and sh in a substantially U shape.

Although not particularly illustrated, the first end E1 of the second sheath 42 having such a configuration is inserted into the distal tubular portion 20a in the same positional relationship as the second sheath 12, and similarly, the distal tubular portion It is fixed to 20a.
That is, the first end E1 of the second sheath 42 is inserted into the distal tubular portion 20a so that the slit 12e is positioned at the center of the slit 20c when viewed from the radial direction. The position of the first end E1 in the axial direction is such that the first side cut surface 42g and the second side cut surface 42h are on the tip side of the main opening tip surface 20k, and the end surface of the second sheath 42 12k is a position on the proximal end side with respect to the inclined portion 20e.

However, in the second sheath 42, since the axial cut surface 42f is cut into the second lumen 42b and the third lumen 42c, the second lumen 42b and the third lumen 42c open in the radial direction at the first end E1. To do.
Therefore, in order not to expose the inserted material in the second lumen 42b and the third lumen 42c, the tube 43 indicated by a two-dot chain line in FIG. 63 is inserted into the second lumen 42b and the third lumen 42c.

Next, a method for manufacturing the treatment instrument 41 will be described focusing on a method for manufacturing the second sheath 42.
FIG. 64 is a perspective process explanatory diagram of the manufacturing process of the endoscope treatment tool according to the second embodiment of the present invention. FIG. 65 is a cross-sectional process explanatory diagram of the manufacturing process of the endoscope treatment tool according to the second embodiment of the present invention. FIG. 66 is a perspective process explanatory diagram of the manufacturing process of the endoscope treatment tool according to the second embodiment of the present invention. FIG. 67 is a cross-sectional process explanatory diagram of the manufacturing process of the endoscope treatment tool according to the second embodiment of the present invention. FIG. 68 is a perspective view illustrating a process of manufacturing the endoscope treatment tool according to the second embodiment of the present invention. FIG. 69 is a cross-sectional process explanatory diagram of the manufacturing process of the endoscope treatment tool according to the second embodiment of the present invention.

As shown in FIG. 64, in order to manufacture the second sheath 42, the multi-lumen tube 52 in which the first lumen 12a, the second lumen 42b, the third lumen 42c, and the fourth lumen 12d are formed is manufactured.
Next, the first side cut surface 42g, the second side cut surface 42h, and the axial cut surface 42f are provided at the end of the multi-lumen tube 52 that becomes the first end E1 of the second sheath 42. Process to form.
First, as shown in FIG. 64, the multi-lumen tube 52 is horizontally arranged so that the first lumen 12a is on the upper side and the fourth lumen 12d is on the lower side, and the core metal 102 is inserted into the first lumen 12a. . Further, the core metal 103 is inserted into each of the second lumen 42b and the third lumen 42c.

The core metal 102 abuts against the inner peripheral surface of the lowermost portion of the first lumen 12a by its own weight. The core metal 103 abuts on the inner peripheral surfaces of the lowermost portions of the second lumen 42b and the third lumen 42c by its own weight.
The core metal 102 and each core metal 103 are inserted to a position further to the back than the position where the first side cut surface 42g and the second side cut surface 42h intersect.
The cored bar 102 and each cored bar 103 are members that regulate the cut amount of the cutter 100 that forms the first side cut surface 42g and the second side cut surface 42h.
Furthermore, each cored bar 103 is also a member that guides the movement of the cutter 100 when the axial cut surface 42f is formed.

First, in order to form the first side cut surface 42g, the cutter 100 is cut by the cutter 100 in the cut direction from the outer peripheral side facing the first lumen 12a and the third lumen 42c toward the multi-lumen tube 52.
At this time, as shown in FIG. 65, the cutter 100 is in an oblique direction in which the cutting edge 100a can simultaneously contact the inserted core bars 102 and 103 from the outer peripheral side facing the first lumen 12a and the third lumen 42c. This is different from the first embodiment.

When such a cutting operation is performed, as shown in FIG. 65, the cutter 100 cuts the multi-lumen tube 52 to form a first side cut surface 42g at the cut portion. However, when the cutting edge 100a of the cutter 100 comes into contact with the core bars 102 and 103, it is impossible to cut further. For this reason, the first side cut surface 42g stops at the position of the cutting edge 100a.
At this time, by appropriately setting the outer diameters of the core bars 102 and 103, the amount of cutting edge 100a cut into the first lumen 12a and the third lumen 42c can be adjusted.
When the cutting edge 100a comes into contact with the core bars 102 and 103, the cutter 100 is pulled out.

Next, as shown in FIGS. 66 and 67, the cutter 100 is rotated about the vertical axis and cut into the multi-lumen tube 52 in a posture that intersects the first side cut surface 42g in an X shape.
As shown in FIG. 67, the cutter 100 cuts until the cutting edge 100a comes into contact with the core metal 103 inserted through the core metal 102 and the second lumen 42b. When the cutting edge 100a comes into contact with the core bars 102 and 103, the cutter 100 is pulled out.
As a result, the second side cut surface 42h is formed.

  Thus, on the side surface of the multi-lumen tube 52, the first side cut surface 42g and the second side cut surface 42h intersecting in the X shape at the point P when viewed from the radial direction are formed.

Next, the axial cut surface 42f is formed.
First, the cored bar 102 is pulled out from the first lumen 12a. Next, the cutter 100 is placed on top of each core metal 103 extended from the multi-lumen tube 52. Next, as shown in FIGS. 68 and 69, the cutter 100 is cut as a cutting direction from the end face 12 k in a direction along the central axis of the multi-lumen tube 52.
At this time, the cutting edge 100a of the cutter 100 maintains a posture orthogonal to the central axis O32 of the multi-lumen tube 32.
Further, the cutter 100 abuts on each core metal 103 from above and moves horizontally with each core metal 103 as a guide. By such a cutting operation of the cutter 100, the axial cut surface 42f is formed from the end face 12k along a horizontal plane parallel to the central axis O52 (see FIG. 69) of the multi-lumen tube 52.

By such a cutting operation, the end portion of the multi-lumen tube 52 is divided into two with the axial cut surface 42f as a boundary.
When the cutting edge 100a intersects the first side cut surface 42g and the second side cut surface 42h closest to the end face 12k, a cut portion (not shown) similar to the cut portion 32B of the first embodiment is separated. To do. As a result, as shown in FIG. 68, the tube main body 52A is formed.
The cutting operation is stopped when the cutting edge 100a of the cutter 100 has moved to the tip side slightly from the point P as seen from the radial direction.

By such a cutting operation, when seen from the radial direction, the first side cutting surface 42g and the second side cutting surface 42h overlap with the axial cutting surface 42f within the range where the piece-like portions 42i and 42j overlap. Is formed (see FIG. 62).
Next, the cutter 100 and each cored bar 103 are removed.

Thus, by forming the first side cut surface 42g, the second side cut surface 42h, and the axial cut surface 42f, the tube main body portion 52A with the side portions cut away is formed. The
Next, the slit 12e is processed from the point P of the tube main body 52A along the central axis O52 in the same manner as in the first embodiment.
In this way, when the slit 12e is formed over the entire length of the tube main body portion 32A, a second sheath 42 as shown in FIG. 61 is formed.

  Such a second sheath 42 is assembled in the same manner as the second sheath 12 of the first embodiment except that the tube 43 is inserted into the second lumen 42b and the third lumen 42c at the first end E1. Thus, the treatment instrument 41 can be manufactured.

In the treatment instrument 41, instead of the first side cut surface 12g, the second side cut surface 12h, and the axial cut surface 12f of the first embodiment, the first side cut surface 42g, Since the second side cut surface 42h and the axial cut surface 42f are provided, the same action as the treatment instrument 1 is provided.
Therefore, according to the treatment instrument 41, even when the guide wire 30 is displaced from the guide wire lumen when the guide wire 30 is inserted, the first side cut surface 42g and the second side cut that intersect in an X shape. The guide wire 30 moves along the surface 42h. For this reason, according to the treatment instrument 41, when the multi-lumen sheath is provided, the guide wire can be easily inserted into the guide wire lumen.

  Although the embodiments of the present invention have been described above, the technical scope of the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention. is there.

  In the description of each of the above embodiments, the example in which the axial cut surface is extended to the distal end side from the point P in the axial direction of the second sheath has been described. However, the axial cut surface may stop at the base end side from the point P as long as it intersects the first side cut surface and the second side cut surface on the end face 12k side.

  In the description of each of the above embodiments, the first side cut surface, the second side cut surface, and the axial cut surface are formed and then the slit 12e is formed. However, the slit 12e may be formed before any of the first side cut surface, the second side cut surface, and the axial cut surface.

  In the description of each of the embodiments described above, the first side cut surface and the second side cut surface are formed, and then the axial cut surface is formed. However, the first side cut surface and the second side cut surface may be formed after the axial cut surface is formed.

In the description of each of the above-described embodiments, an example in which cutting is performed from the axial end surface (end surface 12k) of the first end portion of the multi-lumen sheath when the axial cutting surface is formed has been described. However, as shown in FIGS. 70 and 71, the axial cut surface may be formed by cutting from the tip side of the end surface 12 k as long as it is near the end surface 12 k in the multi-lumen sheath 12.
In this case, the base end side cutting surface 12n in the radial direction is added, and the opening OP and the guide are further engaged by engaging the rear end of the notch surface fixing member 1010 and the base end side cutting surface 12n. The axial displacement with respect to the wire insertion opening 20b can also be reduced.
In addition, as shown in FIG. 72, a protrusion 1015 that is inserted into the guide wire lumen may be provided at the rear end of the notch surface fixing member 1010. When the projection 1015 is present, the multi-lumen sheath can be more securely fixed.

  All the constituent elements described above can be implemented by being appropriately combined or deleted within the scope of the technical idea of the present invention.

1, 41 Treatment tool (endoscopic treatment tool)
2 Insertion section 2A Distal insertion section 2B Proximal insertion section 3 Operation section 4 Treatment section 5 Balloon section 10 Knife wire 11 First sheath 12, 42 Second sheath (multi-lumen sheath)
12a First lumen 12b, 42b Second lumen 12c, 42c Third lumen 12d Fourth lumen 12e Slit (first slit)
12f, 42f Axial cut surface 12g, 42g 1st side cut surface 12h, 42h 2nd side cut surface 12i, 42i piece part (2nd piece part)
12j, 42j piece-like part (first piece-like part)
13 Connection tube 14 Balloon 14B Projection piece 15 Balloon tube 16 Elongation suppression wire 17 Fixing tube 19 Fixing member 20 Operation part main body (sheath holding part)
20a Tip cylindrical part (cylindrical part)
20b Guide wire insertion opening 20c Slit (second slit)
20d Main opening 20e Inclined portion 20j Guide portion 30 Guide wire 32, 52 Multi-lumen tube 32A, 52A Tube body portion 32B Cut portion 100 Cutter 101, 102, 103 Core metal 120 Pressurizer 121 Cylinder 122 Plunger 123 Connection tube 126 Syringe 128 High frequency Power supply device 130 Endoscope 131 Treatment instrument channel 131a Tip opening 173 Forceps plug 1010 Cut surface fixing member (opening fixing member)
1011 Bottom surface 1012 Side surface 1013 Top surface E1 First end E2 Second end O12, O20a, O32, O52 Center axis OP Opening point P Intersection PV Duodenal papilla Q Guide wire operation position S1 Liquid feeding space Sf, sf, Sh, sh, Sg, sg Exposed surface

Claims (2)

A plurality of lumens including a guide wire lumen through which the guide wire is inserted, and a first slit that extends along an axial direction of the guide wire lumen and allows the guide wire to be taken in and out of the guide wire lumen. A formed multi-lumen sheath;
It includes a cylindrical portion that holds the first end of the multi-lumen sheath, and overlaps the first slit in the side surface of the cylindrical portion in order from the distal end side when viewed from the radial direction. A sheath holding portion formed with a guide wire insertion opening having a wide second slit and a main opening having a wider opening width than the second slit;
With
The first end of the multi-lumen sheath is
A side cut surface formed by cutting from the outer peripheral surface of the multi-lumen sheath to the inside of the guide wire lumen as seen from the radial direction of the multi-lumen sheath;
An axial cut surface formed by cutting in parallel to the central axis of the guidewire lumen from the axial end surface side of the first end of the multi-lumen sheath to a position intersecting the side cut surface;
The side cut surface, and an opening formed in a position overlapping the main opening in the axial cut surface and communicating with the guide wire lumen,
An opening fixing member having a bottom surface that abuts against the axial cut surface, an upper surface that engages with the inner wall of the cylindrical portion, and a side surface that engages with the main opening in the circumferential direction includes the guide wire insertion opening. Installed at the base end of
Endoscopic treatment tool. The opening fixing member has, on the distal end side, an inclined portion that extends from the outer periphery of the cylindrical portion to the inside of the guide wire lumen.
The endoscope treatment tool according to claim 1.

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