JPH11164836A - Treatment tool for endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a treatment tool for endoscope which does not cause buckling of the sheath consisting of a flexible tube when the operating wire is operated to draw and has excellent durability. SOLUTION: In the state where the tip end of a sheath 11 protrudes from a treatment tool insert channel 2 of an endoscope, at least a reinforcing insert tube 20 consisting of a flexible tube with a diameter which allows loose insertion of an operating wire 14 in inside of the whole range of the sheath 11 of the part positioned on the near side from the inlet 2a of the treatment tool insert channel 2 and to prevent buckling of the sheath 11 when an operating wire 14 is drawn, is inserted, or a reinforcing coated tube to prevent buckling of the sheath 11 by narrowing the space between the sheath 11 and the operating wire 14 is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a treatment tool for an endoscope which is used by being inserted into and removed from a treatment tool insertion channel of an endoscope.

[0002]

2. Description of the Related Art Many treatment tools for endoscopes have a structure in which an operation wire is inserted in a flexible sheath inserted into and removed from a treatment tool insertion channel of the endoscope so as to be able to advance and retreat in the axial direction. There are two types of sheaths, one using a tightly wound coil pipe made of metal and the other using a flexible tube.

[0003]

As schematically shown in FIG. 6, a sheath 91 made of a flexible tube buckles into a shape that undulates due to a compressive force when an operation wire 92 is pulled.

For this reason, as shown in FIG. 7, when the treatment tool is inserted into the treatment tool insertion channel 2 of the endoscope 1 and used, a portion located closer to the inlet 2a of the treatment tool insertion channel. The sheath 91 buckles in a wavy manner,
There are drawbacks such as the performance of the treatment tool is significantly reduced, and the life is extremely shortened. 93 is an operation unit of the treatment tool.

[0005] In view of this, for example, a helical tube in which a thin metal strip is helically wound with a constant diameter is arranged along the inner surface of a sheath made of a flexible tube to reinforce the helical tube (Japanese Patent Laid-Open No. Hei 9 (1999)). -206274).

However, even with such reinforcement, FIG.
As shown in FIG. 7, the sheath 91 in which the spiral tube 94 is inserted
Easily bends and buckles, and also buckles due to compression.

Accordingly, an object of the present invention is to provide an endoscope treatment tool having excellent durability in which buckling does not occur in a sheath made of a flexible tube when an operation wire is pulled. .

[0008]

Means for Solving the Problems To achieve the above object, a treatment tool for an endoscope according to the present invention is provided in a sheath made of a flexible tube inserted into and removed from a treatment tool insertion channel of an endoscope. In the treatment instrument for an endoscope in which an operation wire is inserted so as to be able to advance and retreat in the axial direction, and a pulling operation of the operation wire is performed from a hand side, a treatment member arranged on a distal end side is operated. When the distal end is protruded from the treatment instrument insertion channel of the endoscope, the operation wire is loosely inserted at least into the inner surface of the entire range of the sheath located at a position closer to the entrance than the entrance of the treatment instrument insertion channel. A reinforcing insertion tube made of a flexible tube having an inner diameter and preventing buckling of the sheath when the operation wire is pulled is inserted.

The reinforcing insertion tube preferably has higher rigidity than the sheath, and the clearance between the inner surface of the reinforcing insertion tube and the operation wire is 0.05 mm to 0 mm in diameter. 0.3 mm.

[0010] In the treatment instrument for an endoscope of the present invention, an operation wire is inserted in a sheath made of a flexible tube which is inserted into and detached from a treatment instrument insertion channel of the endoscope so as to be able to advance and retreat in the axial direction. In the endoscope treatment tool configured to operate the treatment member arranged on the distal end side by pulling the operation wire from the proximal side, the distal end of the sheath is moved from the treatment instrument insertion channel of the endoscope. When the space between the sheath and the operation wire is narrowed on the outer surface of the entire range of the operation wire at least in a portion located closer to the entrance of the treatment instrument insertion channel when the device is in the protruded state, the seat of the sheath is A reinforcing covering tube for preventing bending is provided.

[0011] The reinforcing covering tube may be covered over substantially the entire length of the operation wire, and in this case, the reinforcing covering tube may be a fluororesin coating covering the operation wire.

Further, the reinforcing sheath tube may have higher rigidity than the sheath, and a clearance between the outer surface of the reinforcing sheath tube and the sheath may be 0.1 mm to 0.3 mm in diameter. It should be in the range.

[0013] The treatment member may be attached to the distal end of the operation wire independently of the sheath, and the operation wire may be inserted into and removed from the distal end side of the sheath.

[0014]

Embodiments of the present invention will be described with reference to the drawings. FIG. 2 shows a use state in which the treatment tool 10 is inserted into the treatment tool insertion channel 2 of the endoscope 1,
The distal end of the treatment instrument 10 inserted from the entrance 2a of the treatment instrument insertion channel 2 projects from the outlet 2b of the treatment instrument insertion channel 2.

The treatment instrument 10 is, for example, a high-frequency snare for an endoscope. The stalk of the polyp is tied up by a distal treatment member 12 composed of a loop wire, and the treatment instrument 10 is connected to an operation section 13 connected to the proximal end of the sheath 11. Remote control of the sheath 11
When the operation wire inserted therein is pulled toward the user, the distal treatment member 12 is pulled into the distal end of the sheath 11. 1
Reference numeral 31 denotes a slider that is slid on the operation unit 13.

FIG. 1 shows the endoscope treatment tool in a state where the operation unit 13 is removed. The sheath 11 is made of a flexible tube made of, for example, tetrafluoroethylene resin, and has a diameter that can be inserted into and removed from the treatment instrument insertion channel 2 of the endoscope 1.

In the sheath 11, an operation wire 14 is inserted and disposed over the entire length so as to be able to advance and retreat in the axial direction.
The distal treatment member 12 is connected to the distal end of the operation wire 14 by the connecting pipe 1.
5 are connected by silver brazing or the like.

An operating portion 13 is provided at the proximal end of the sheath 11.
A fixed base 16 is fixedly connected to and fixed to an end of the operation wire 14 projecting further from the fixed side, and a movable base 17 which is connected to the slider 131 and operated forward and backward is fixed. ing.

Further, in order to prevent the operation wire 14 from being bent at a portion closer to the hand than the fixed side base 16 when the operating wire 14 is pushed in, the fixed side base 16 is moved from the position of the movable side base 17. Inside, a metal wire reinforcing pipe 18 is fitted on the operation wire 14.

Since the vicinity of the proximal end of the sheath 11 is easily broken in the vicinity of the connection portion with the fixed base 16 which is a rigid body, the anti-bending tube 19 is fitted on the outer surface of the sheath 11. As shown in FIG. 2, the buckling prevention tube 19 is fitted to the sheath 11 only in a portion very close to a connection portion with the operation unit 13.

As shown in FIG. 1, a reinforcing insertion tube 20 for preventing buckling of the sheath 11 when the operation wire 14 is pulled is inserted and arranged along the inner surface of the sheath 11. Have been. Insertion tube for reinforcement 20,
The proximal end of the sheath 11 and the buckling prevention tube 19 are both fixed to the fixed base 16.

The reinforcing insertion tube 20 includes the operation wire 1
4 so as not to hinder the forward / backward movement of the operation wire 1
4 has an inside diameter that is loosely inserted. As shown in FIG. 2 as the “reinforcing range”, the reinforcing insertion tube 20 is used when the distal end of the sheath 11 projects from the distal end outlet 2 b of the treatment instrument insertion channel 2 of the endoscope. 11 is inserted into the range from the proximal end of the instrument 11 to the inside of the treatment instrument insertion channel 2.

As the reinforcing insertion tube 20, a flexible tube made of the same tetrafluoroethylene resin tube as the sheath 11 may be used. For example, the sheath tube 11 is made of a polyimide resin or a polyethylene resin. By using a material having high rigidity, durability against a compressive force is further improved.

In the endoscope treatment tool of the embodiment configured as described above, as shown schematically in FIG. 3, a compressive force applied when the operation wire 14 is pulled is applied to the sheath 1.
Since the sheath 11 can be dispersed and received not only on the reinforcing insertion tube 20 but also on the reinforcing insertion tube 20, the phenomenon that the sheath 11 undulates and buckles can be prevented or significantly suppressed. Note that the clearance between the inner peripheral surface of the reinforcing insertion tube 20 and the operation wire 14 may be in a range of about 0.05 mm to 0.3 mm in diameter.

FIG. 4 shows a treatment tool for an endoscope according to a second embodiment of the present invention, and shows a state in which the operation section 13 has been removed similarly to the above-described first embodiment. . In this embodiment, instead of the reinforcing insertion tube 20 of the first embodiment, the outer peripheral surface of the sheath 11 is covered with a reinforcing covering tube 30 made of a flexible tube.

As a result, the space between the inner peripheral surface of the sheath 11 is narrowed, and the buckling of the sheath 11 is prevented. The clearance between the inner peripheral surface of the sheath 11 and the reinforcing coating tube 30 is 0.1 mm to 0.3 m in diameter.
m.

The range in which the reinforcing sheath tube 30 is covered with the operation wire 14 is the same as the reinforcing insert tube 20 of the first embodiment, in that the distal end of the sheath 11 has a treatment instrument insertion channel for an endoscope. In the state where the protruding portion 2 protrudes from the distal end outlet 2 b, it may be in a range from the distal end portion of the wire reinforcing pipe 18 to the inside of the treatment instrument insertion channel 2.

The reinforcing sheath tube 30 includes:
A flexible tube made of the same tetrafluoroethylene resin tube as the sheath 11 may be used, but the outer peripheral surface of the operation wire 14 may be coated instead of the tube. Also, if a material having higher rigidity than the sheath 11 is used, such as a polyimide resin or a polyethylene resin,
The durability against compression force is further improved.

FIG. 5 shows a treatment tool for an endoscope according to a third embodiment of the present invention. , The entire area between the connecting pipe 15 and the wire reinforcing pipe 18).

Also, the maximum diameter d of the movable base 17 is formed so as not to be larger than the outer diameter of the reinforcing sheath tube 30.
It can be inserted inside. Thereby, the clearance between the sheath 11 and the reinforcing sheath tube 30 can be made as small as possible.

Further, the operation wire 14 can be easily pulled out to the distal end side of the sheath 11, and the assembly can be easily performed by inserting the movable base 17 from the distal end side of the sheath 11. That is, the treatment tool can be disassembled and assembled without much care in maintaining the shape of the wire loop-shaped flexible distal treatment member 12, and the treatment tool can be more easily cleaned.

[0032]

According to the present invention, the operation wire is towed by inserting the reinforcement insertion tube into the inner surface of the sheath made of the flexible tube or covering the operation wire with the reinforcement coating tube. The buckling does not occur in the sheath when it is pressed, and excellent durability can be obtained.

[Brief description of the drawings]

FIG. 1 is a side sectional view of an endoscope treatment tool according to a first embodiment of the present invention in a state where an operation unit is removed.

FIG. 2 is a schematic external view showing a use state of the endoscope treatment tool according to the first embodiment of the present invention.

FIG. 3 is a schematic side cross-sectional view showing a state of a sheath during an operation wire pulling operation according to the first embodiment of the present invention.

FIG. 4 is a side cross-sectional view of an endoscope treatment tool according to a second embodiment of the present invention in a state where an operation unit is removed.

FIG. 5 is a side cross-sectional view of the endoscope treatment tool according to a third embodiment of the present invention in a state where an operation unit is removed.

FIG. 6 is a schematic side cross-sectional view showing a state of a sheath during operation wire pulling operation of a conventional endoscope treatment tool.

FIG. 7 is a schematic external view showing a use state of a conventional treatment tool for an endoscope.

FIG. 8 is a partial side sectional view showing a bent state of a conventional sheath.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 endoscope 2 treatment instrument insertion channel 11 sheath 12 distal treatment member 14 operation wire 20 reinforcement insertion tube 30 reinforcement coating tube

Claims (9)

[Claims] An operation wire is inserted in a sheath made of a flexible tube inserted into and removed from a treatment instrument insertion channel of an endoscope so as to be able to advance and retreat in an axial direction, and the operation wire is pulled from a hand side. The endoscope treatment instrument configured to operate the treatment member disposed on the distal end side, wherein at least the treatment instrument insertion channel when the distal end of the sheath protrudes from the treatment instrument insertion channel of the endoscope. A flexible tube having an inner diameter through which the operation wire is loosely inserted is formed on the inner surface of the entire area of the sheath at a portion located closer to the hand than the entrance of the sheath, and the sheath buckles when the operation wire is pulled. A treatment instrument for an endoscope, wherein a reinforcing insertion tube for preventing the occurrence of the endoscope is inserted. 2. The treatment instrument for an endoscope according to claim 1, wherein the reinforcing insertion tube has higher rigidity than the sheath. 3. The clearance between the inner surface of the reinforcing insertion tube and the operation wire is 0.05 m in diameter.
The treatment tool for an endoscope according to claim 1, wherein the treatment instrument has a length in a range of m to 0.3 mm. 4. An operation wire is inserted in a sheath made of a flexible tube inserted into and removed from a treatment instrument insertion channel of an endoscope so as to be able to advance and retreat in an axial direction, and the operation wire is pulled from a hand side. Thus, the treatment tool for an endoscope, in which the treatment member disposed on the distal end side is operated, wherein at least the treatment tool insertion channel is in a state where the distal end of the sheath protrudes from the treatment tool insertion channel of the endoscope. A reinforcing coating tube for preventing buckling of the sheath by narrowing the space between the sheath and the operation wire is provided on the outer surface of the entire area of the operation wire in a portion located closer to the hand than the entrance of the operation wire. A treatment tool for an endoscope, comprising: 5. The treatment tool for an endoscope according to claim 4, wherein the reinforcing sheath tube is covered over substantially the entire length of the operation wire. 6. The treatment tool for an endoscope according to claim 4, wherein the reinforcing coating tube is a fluororesin coating coated on the operation wire. 7. The treatment tool for an endoscope according to claim 4, wherein the reinforcing sheath tube has higher rigidity than the sheath. 8. The clearance between the outer surface of the reinforcing coating tube and the sheath is 0.1 mm or more in diameter.
The treatment tool for an endoscope according to claim 4, 5, 6, or 7, which is in a range of 0.3 mm. 9. The treatment member is attached to a distal end of the operation wire independently of the sheath, and the operation wire is insertable into and removable from the distal end side of the sheath. Item 8. The treatment tool for an endoscope according to any one of Items 8.