JP2000217831A - Wire loop type treatment tool for endoscope - Google Patents

Abstract

(57) [Problem] To provide a wire loop-type treatment instrument for an endoscope that allows a user to easily insert and assemble a wire unit into a sheath unit. A tubular member (25) for inserting and holding a wire loop (22) in a contracted state is attached to a wire unit (20), and a sheath unit (10) is straightened into insertion passages (13, 16) through which the wire unit (20) is inserted. A tubular member engaging portion 18 for engaging the tubular member 25 in a state where the tubular member 25 communicates with the tubular member engaging portion 1 is provided.
8, the wire loop 22 is kept in a constricted state from within the tubular member 25 and the sheath unit 10
Can be directly pushed into the insertion passages 13 and 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire loop treatment device for an endoscope in which a treatment member at a distal end is formed into a loop shape which can be expanded and contracted by an elastic wire.

[0002]

2. Description of the Related Art An endoscope wire loop-type treatment tool such as an endoscope snare, an endoscope basket-type grasping tool, or the like is used.
Generally, a wire loop is connected to a distal end of an operation wire inserted into a sheath inserted into and removed from a treatment instrument insertion channel of an endoscope. The wire loop narrows inside the sheath, and expands outside of the sheath due to its own elasticity.

[0003]

In such a wire-loop type treatment instrument for an endoscope, only a wire unit in which an operation wire is connected to a wire loop is often replaced with a new one. You need to pass the unit through the sheath unit yourself.

However, in order to pass the wire unit through the sheath unit, it is necessary to insert a wire loop having a resiliently widened shape into the sheath while narrowing the wire loop with a fingertip. It is too thick to fit in).

[0005] Therefore, attempts to pass the wire unit through the sheath unit often fail, not only taking a very long time to work, but also often breaking the wire loop portion.

Accordingly, an object of the present invention is to provide a wire loop type treatment instrument for an endoscope which allows a user to easily insert and assemble a wire unit into a sheath unit.

[0007]

In order to achieve the above object, a wire loop type treatment instrument for an endoscope according to the present invention has a wire loop formed so as to be expandable and contractible by an elastic wire and connected to a distal end of an operation wire. In a wire loop type treatment instrument for an endoscope which is used by passing a wire unit having the above configuration through a sheath unit, a tubular member for inserting and holding the wire loop in a narrowed state is attached to the wire unit. The sheath unit is provided with a tubular member engaging portion for engaging the tubular member in a state of being in straight communication with the insertion passage through which the wire unit is inserted, and the tubular member is provided with the tubular member engaging portion. The wire loop can be directly pushed from the inside of the tubular member into the insertion passage of the sheath unit while being in a constricted state. And it said that it has cut way.

[0008] The sheath unit may include a sheath made of a flexible tube and a base attached to a base end of the sheath, and the tubular member engaging portion may be formed in the base. The engagement portion may be a hole into which the tubular member is inserted.

Further, the tubular member may be formed of a flexible tube, and a cut may be formed over the entire length.

[0010]

Embodiments of the present invention will be described with reference to the drawings. FIG. 4 shows an endoscope snare,
The sheath 11 inserted into and removed from the treatment instrument insertion channel of the endoscope (not shown) is formed of an electrically insulating flexible tube such as a tetrafluoroethylene resin tube.

A base end cap 12 is connected and fixed to the base end of the sheath 11, and the base end cap 12 is detachably connected to an operation unit 30 operated by an operator or an assistant on the hand side. ing.

An operating wire 21 made of, for example, a stainless steel wire is inserted through the entire length of the sheath 11 so as to be able to advance and retreat in the axial direction, and a wire loop 22 made of a conductive elastic wire is provided at the tip of the operating wire 21. Are connected.

The wire loop 22 moves in and out of the distal end of the sheath 11 when the operation wire 21 is advanced and retracted from the operation section 30 side. Outside the sheath 11, the wire loop 22 has its own elasticity as shown by a dashed line in FIG. Thus, it spreads in a loop shape and contracts by being drawn into the sheath 11.

In the endoscope snare thus constructed, one unit (sheath unit 10) is formed by the sheath 11 and the base end cap 12, and one unit (the sheath unit 10) is formed by the operation wire 21 and the wire loop 22. A wire unit 20) is formed.

FIG. 5 shows a base end portion of the sheath unit 10. A base end cap 12 fixedly connected to the base end of the sheath 11 has a through hole 13 which is straight with respect to the axis of the sheath 11. Is formed, and the syringe barrel receiver 14 communicating therewith is formed so as to protrude laterally in a T-shape.

A cylindrical member 15 is screwed into the base end cap 12 at a position opposite to the side to which the sheath 11 is connected. Although the cylindrical member 15 is divided into two parts for convenience in manufacturing, one part may be functionally used.

At the axial position of the cylindrical member 15, the base end cap 1 is provided.
A through hole 16 is formed, which communicates straight with the second through hole 13, and the operation wire 21 passes through them.

A receiving hole 18 (tubular member engaging portion) having an inner diameter larger than that of the through hole 16 is formed in the protruding end portion of the cylindrical member 15 in a counterbore hole shape. Reference numeral 17 denotes an O-ring for sealing between the operation wire 21 and the outer peripheral surface.

FIG. 6 shows the wire unit 20;
The operation wire 21 and the wire loop 22 are connected and fixed by a connection pipe 23 that can pass through the inside of the sheath unit 10. The base end of the operation wire 21 is attached to and detached from an operation member arranged in the operation unit 30. An end cap 24 which is freely engaged is attached. This end cap 24 is
It has a thickness that cannot pass through the sheath unit 10.

The wire unit 20 is shipped as a single unit, and it is necessary for the user to put the wire unit 20 through the sheath unit 10 and assemble it in a use state. Therefore, the wire unit 20 of the present invention is configured as shown in FIG.
As shown in FIG. 9, the wire loop 22 is shipped with the wire loop 22 inserted into the protective pipe 25 (tubular member).

FIG. 7 shows that the wire loop 22 is
8 shows a state before being inserted into the protection pipe 2.
FIG. 9 shows a state in which the wire loop 22 is inserted into the protective pipe 25.

The protection pipe 25 is a tube having a circular cross section as shown in FIG. 8, and is formed of, for example, an ethylene tetrafluoride resin tube. Then, it is previously sterilized and sterilized together with the wire unit 20 (or separately).

The inner diameter of the protection pipe 25 is the same as that of the cylindrical member 1.
5, the wire loop 22 inserted therein is elastically deformed and narrowed as shown in FIG. Protective pipe 25
Is formed to a thickness that can be fitted almost perfectly into the receiving hole 18 of the through hole 16.

FIGS. 1 to 3 show a state in which the wire unit 20 is assembled through the sheath unit 10. First, as shown in FIG.
The protection pipe 25 inserted in the state in which it is narrowed is inserted into the receiving hole 18 as it is.

After the protection pipe 25 is completely inserted into the receiving hole 18, the operation wire 21 is pushed in from the hand side as shown in FIG. Then, the wire loop 22
The base cap 1 from the inside of the protection pipe 25 while the constricted state
It is directly pushed into the through holes 16 and 13 on the two sides, and further pushed into the sheath 11. Therefore, the operation of passing the wire unit 20 through the sheath unit 10 can be performed extremely easily and in a short time without damaging the wire loop 22.

When the wire loop 22 is pushed to the end of the sheath 11 in this manner, as shown in FIG. 3, the protective pipe 25 is pulled out from the receiving hole 18 to the proximal side, and the sheath unit 10 and the wire unit 20 are pulled out. Are respectively connected to the operation unit 30.

In this embodiment, the length of the protection pipe 25 is formed longer than the depth of the receiving hole 18 so that the protection pipe 25 can be easily pulled out from the receiving hole 18. 18 so as not to be completely fitted.

The present invention has other various embodiments. For example, as shown in FIGS. 10 and 11, a cut 251 extending over the entire length may be formed in the protective pipe 25 in a direction parallel to the axis. .

When such a cut 251 is formed, as shown in FIG. 12, the protective pipe 25 slightly drawn from the tubular member 15 can be removed to the side.
After pushing the wire loop 22 toward the sheath unit 10, the protection pipe 25 can be removed at any time.

As shown in FIGS. 13 and 14, the protection pipe 25 is formed of a metal pipe that fits completely in the receiving hole 18, and after the wire unit 20 is inserted through the sheath unit 10, the protection pipe 25 25 may be used as it is in the receiving hole 18 as it is.

The present invention is not limited to a snare for an endoscope, but also includes a basket-type collecting device for an endoscope and a wire loop formed to be expandable and contractable by an elastic wire, which is connected to a distal end of an operation wire. The present invention can be widely applied to a wire loop type treatment instrument for an endoscope which is used by passing a wire unit through a sheath unit.

[0032]

According to the present invention, a tubular member for inserting a wire loop and holding it in a contracted state is attached to the wire unit, and the tubular member is engaged with the sheath unit for engaging the tubular member. By providing the portion, the wire loop can be directly pushed into the insertion passage of the sheath unit from within the tubular member while being in a constricted state,
The user can easily insert and assemble the wire unit into the sheath unit without breaking the wire loop.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a state immediately before a wire unit according to a first embodiment of the present invention is inserted into a sheath unit.

FIG. 2 is a side sectional view showing a state where the wire unit according to the first embodiment of the present invention has begun to be inserted into a sheath unit.

FIG. 3 is a side cross-sectional view showing a state where the wire unit according to the first embodiment of the present invention has been inserted into a sheath unit.

FIG. 4 is an external view of an endoscope snare according to the first embodiment of the present invention.

FIG. 5 is a side sectional view of a proximal end portion of the sheath unit according to the first embodiment of the present invention.

FIG. 6 is a side view of the wire unit according to the first embodiment of the present invention.

FIG. 7 is a side sectional view of a state immediately before a protection pipe is attached to the wire unit according to the first embodiment of the present invention.

FIG. 8 is a front sectional view of the protection pipe according to the first embodiment of the present invention.

FIG. 9 is a side sectional view showing a state where a protection pipe is attached to the wire unit according to the first embodiment of the present invention.

FIG. 10 is a front sectional view of a protective pipe according to a second embodiment of the present invention.

FIG. 11 is a side sectional view showing a state immediately before a protective pipe is attached to a wire unit according to a second embodiment of the present invention.

FIG. 12 is a side view of a state when a protection pipe according to a second embodiment of the present invention is removed.

FIG. 13 is a side sectional view showing a state where a protective pipe is attached to a wire unit according to a third embodiment of the present invention.

FIG. 14 is a side cross-sectional view showing a state where the wire unit according to the third embodiment of the present invention has been inserted into a sheath unit.

[Explanation of symbols]

 Reference Signs List 10 sheath unit 11 sheath 12 base end cap 13 through hole 15 cylindrical member 16 through hole 18 receiving hole (tubular member engaging portion) 20 wire unit 21 operation wire 22 wire loop 25 protective pipe (tubular member)

Claims (4)

[Claims] An endoscope wire loop type treatment instrument used by passing a wire unit having a configuration in which a wire loop formed to be expandable and contractible by an elastic wire is connected to a distal end of an operation wire through a sheath unit. A tubular member for inserting and holding the wire loop in a contracted state is attached to the wire unit, and the tubular member is connected to the sheath unit so as to be in straight communication with an insertion passage through which the wire unit is inserted. Providing a tubular member engaging portion for engaging the tubular member with the tubular member engaging portion, thereby keeping the wire loop in a narrowed state from the inside of the tubular member. A wire loop type treatment instrument for an endoscope, which can be directly pushed into an insertion passage of a unit. 2. The apparatus according to claim 1, wherein the sheath unit includes a sheath made of a flexible tube and a base attached to a base end of the sheath, and the tubular member engaging portion is formed on the base. Wire loop type treatment tool for endoscope. 3. The endoscope wire loop treatment tool according to claim 1, wherein the tubular member engaging portion is a hole into which the tubular member is inserted. 4. The endoscope wire loop treatment device according to claim 1, wherein the tubular member is formed of a flexible tube, and a cut is formed over the entire length.