JP3563906B2 - Wire loop type treatment tool for endoscope - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a wire loop treatment device for an endoscope such as a snare for an endoscope or a basket-type foreign matter collection device for an endoscope.
[0002]
[Prior art]
As shown in FIG. 7, for example, a conventional endoscope wire loop-type treatment tool such as an endoscope basket-type foreign matter collection tool has an operation wire 92 that can be advanced and retracted in an axial direction within an outer tube 91. A loop is formed by inserting and disposing, for example, four elastic wires 93 integrally bound on the distal end side and the proximal end side, and the proximal end is connected to the distal end of the operation wire 92.
[0003]
The distal end portions of the four elastic wires 93 are inserted into a distal binding tube 94 and fixed thereto by brazing or the like, and the proximal end portions of the elastic wires 93 are inserted into a connecting tube 95 for connecting to the operation wire 92. It is fixed there by brazing or the like.
[0004]
[Problems to be solved by the invention]
When the foreign object 100 is accommodated in the wire loop formed by the elastic wires 93 as described above, each elastic wire 93 is moved outward at the boundary portion A between the binding portion and the non-binding portion on the distal end side as shown in FIG. Bent toward
[0005]
Then, when the operation wire 92 is pulled to firmly grip the foreign matter, a strong force is applied to spread the elastic wire 93 outward as shown in FIG. 9, and the boundary portion A between the bound portion and the non-bound portion is applied. An extreme concentration of stress occurs to cause fatigue, and the elastic wire 93 is easily broken in a short period of time.
[0006]
Accordingly, an object of the present invention is to provide a wire loop treatment device for an endoscope in which a binding portion of an elastic wire forming a wire loop has excellent durability.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the wire loop treatment device for an endoscope according to the present invention is configured such that a plurality of elastic wires integrally bound at a distal end side and a rear end side to form a loop are provided at the distal end of the operation wire. In the connected endoscope wire loop treatment tool, the elastic wire is removed from the binding portion side to the non-binding portion side at a boundary portion between the binding portion and the non-binding portion in the binding portion on the distal end side. It is characterized by being arranged in an oblique direction spreading in the direction.
[0008]
The divergent angle of the elastic wire at the boundary between the binding portion and the non-binding portion on the distal end side is preferably in the range of 20 ° to 40 °.
[0009]
Further, the elastic wire is also disposed obliquely at the boundary portion between the binding portion and the non-binding portion in the binding portion on the rear end side, which spreads outward from the binding portion side to the non-binding portion side. Is also good.
[0010]
In this case, the divergent angle of the elastic wire at the boundary between the binding portion and the non-binding portion on the rear end side is preferably in a range of 10 ° to 40 °.
Further, at an end of the binding portion adjacent to the non-binding portion, a fixing agent may be applied on a surface of the elastic wire to bind the elastic wire.
[0011]
It should be noted that three or more elastic wires may be provided to form a wire loop of the basket-type foreign matter collection device, or two elastic wires may be provided to form a high-frequency snare wire loop.
[0012]
Then, the two elastic wires may be formed of a single wire as a material, and a bonding agent may be applied at the tip, and the two wires may be substantially bound there.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to the drawings.
FIG. 2 shows a distal end portion of a basket-type foreign matter collecting tool for an endoscope to which the present invention is applied.
[0014]
Reference numeral 1 denotes a flexible mantle tube made of, for example, a tetrafluoroethylene tube which is inserted into and removed from a forceps channel of an endoscope. It is inserted and arranged. The operating wire 2 is pushed and pulled by an operating unit (not shown) connected to the proximal end of the mantle tube 1.
[0015]
Reference numeral 3 denotes a plurality (for example, four) of elastic wires made of, for example, a stainless steel wire, which form a cage loop as a whole, and are bent at a plurality of points in the middle so as to form a loop in a natural state.
[0016]
The plurality of elastic wires 3 are integrally bundled on the front end side, and are integrally bundled and connected to the operation wire 2 on the rear end side. In addition, in order to constitute a basket-type foreign matter collection tool, at least three elastic wires 3 may be used.
[0017]
FIG. 1 is an enlarged view of the binding portion on the distal end side of the elastic wire 3. The distal ends of all the elastic wires 3 are collectively passed through a distal binding tube 4, and are fixed thereto by silver brazing or the like. The axis of the tip bundling tube 4 is located substantially on an extension of the axis of the mantle tube 1.
[0018]
Each elastic wire 3 is bent outward at a position protruding from the rear end of the distal binding tube 4. Then, a fixing agent 7 such as silver solder is applied from the rear end surface of the distal end binding tube 4 to the outer peripheral surface of the elastic wire 3.
[0019]
As a result, each of the elastic wires 3 is in a state of being bound not only in the portion inside the distal end bundling tube 4 but also in the portion fixed with the fixing agent 7, and the rear end portion A of the fixing agent 7 is not bound with the bound portion. It is the boundary with the part.
[0020]
Therefore, each elastic wire 3 is in a state of being obliquely arranged to spread outward from the binding portion side to the non-binding portion side at the boundary portion A between the binding portion and the non-binding portion. The spread angle α is, for example, in the range of 20 ° to 40 °.
[0021]
When the foreign object is accommodated in the loop formed by the elastic wire 3 and the operation wire 2 is pulled backward and the foreign object is tightened by the elastic wire 3, as shown in FIG. It is spread outward at a boundary portion A with the binding portion.
[0022]
However, since each elastic wire 3 is originally arranged obliquely at the boundary portion A between the bound portion and the non-bound portion, the amount of deformation from that state is small. No extremely large stress concentration occurs.
[0023]
FIG. 4 is an enlarged view of the rear end side binding portion of the elastic wire 3, and the rear ends of all the elastic wires 3 are collectively passed through the rear end connection pipe 5, and the front half of the rear end connection pipe 5. It is fixed to the inside by silver brazing or the like. The distal end portion of the operation wire 2 is passed through the rear half portion of the rear end connection pipe 5 and is fixed by silver brazing or the like.
[0024]
Each elastic wire 3 is bent outward at a position protruding from the front end of the rear end connection pipe 5. Then, from the distal end surface of the rear end connection pipe 5 to the outer peripheral surface of the elastic wire 3, a fixing agent 7 such as silver solder is applied similarly to the distal end side.
[0025]
As a result, each elastic wire 3 is in a state of being bound not only in the portion inside the rear end connection pipe 5 but also in the portion fixed with the fixing agent 7, and the front end portion B of the fixing agent 7 is not bound with the bound portion. It is the boundary with the part.
[0026]
Therefore, similarly to the distal end side, each elastic wire 3 is in a state of being obliquely arranged to spread outward from the binding site side to the non-binding site side at the boundary portion B between the binding site and the non-binding site. .
[0027]
The spread angle β is, for example, in the range of 10 ° to 40 °, so that when a foreign object is accommodated in the loop, extremely large stress concentration does not occur in the elastic wire 3 at the boundary portion B.
[0028]
FIG. 5 shows a distal end portion of a basket-type foreign matter collection device for an endoscope according to a second embodiment of the present invention, in which the elastic wire 3 is formed in a smooth curved shape without bending. Other configurations of each unit are the same as those of the first embodiment.
[0029]
FIG. 6 shows a distal end portion of a high-frequency snare for an endoscope according to a third embodiment of the present invention, in which an elastic wire 3 is formed by a single wire as a material to form a loop.
[0030]
However, the distal end portion of the elastic wire 3 is formed in a V-shaped pointed shape, and a fixing agent 7 such as silver solder is applied to the portion and is solidified. The base end portion of the elastic wire 3 is inserted into the rear end connection pipe 5 and is filled with the fixing agent 7 as in the first embodiment.
[0031]
Therefore, the elastic wire 3 is substantially the same as two wires bound at the distal end portion and the proximal end portion. A boundary portion A between the binding portion and the non-binding portion on the distal end side by the adhesive 7 is located at a portion where the elastic wire 3 is directed outward. In this embodiment, the same effect as in the first embodiment is obtained. can get.
[0032]
【The invention's effect】
According to the present invention, the elastic wires are arranged obliquely so as to extend outward from the binding portion side to the non-binding portion side at the boundary between the binding portion and the non-binding portion of the plurality of elastic wires forming the wire loop. Therefore, even if a force is applied in the direction in which the elastic wire is spread, the amount of deformation of the spread of the elastic wire is small, and no extremely large stress concentration occurs in the elastic wire at the boundary between the bound portion and the non-bound portion. Therefore, the binding portion of the elastic wire forming the wire loop can obtain excellent durability.
[Brief description of the drawings]
FIG. 1 is a partially enlarged side sectional view of a distal end portion of an elastic wire according to a first embodiment of the present invention.
FIG. 2 is a side sectional view of a distal end portion of the wire loop treatment device for an endoscope according to the first embodiment of the present invention.
FIG. 3 is a partially enlarged side sectional view of a distal end portion of an elastic wire in a use state according to the first embodiment of the present invention.
FIG. 4 is a partially enlarged side sectional view of a rear end portion of the elastic wire according to the first embodiment of the present invention.
FIG. 5 is a side cross-sectional view of a distal end portion of a wire loop treatment device for an endoscope according to a second embodiment of the present invention.
FIG. 6 is a side sectional view of a distal end portion of an endoscope wire loop treatment tool according to a third embodiment of the present invention.
FIG. 7 is a side sectional view of a distal end portion of a conventional wire loop treatment device for an endoscope.
FIG. 8 is a side sectional view of a distal end portion of a conventional elastic wire in use.
FIG. 9 is a side sectional view of a distal end portion of a conventional elastic wire in use.
[Explanation of symbols]
2 Operation wire 3 Elastic wire 4 Tip bundling tube 5 Trailing end connecting tube 7 Adhesive A Boundary part between bound part and unbound part at front end B Boundary part between bound part and non-bound part at rear end

Claims (8)

In the distal end side and the rear side and the endoscope wire loop type treatment instrument in which a plurality of resilient wires are connected to the distal end of the operation wire, each forming a integrally bundled secured to the loop at,
The plurality of elastic wires are arranged obliquely so as to extend outward from the inside of the binding and fixing portion to the outside in a range extending both inside and outside the binding and fixing portion on the distal end side. Endoscope wire loop treatment tool. 2. The wire loop treatment device for an endoscope according to claim 1, wherein a divergence angle of the elastic wire at a boundary portion between the binding portion and the non-binding portion on the distal end side is in a range of 20 ° to 40 °. The elastic wire is also disposed obliquely at a boundary portion between the binding portion and the non-binding portion in the binding portion on the rear end side, which spreads outward from the binding portion side to the non-binding portion side. 3. The wire loop treatment device for an endoscope according to 1 or 2. 4. The wire loop treatment device for an endoscope according to claim 3, wherein a divergence angle of the elastic wire at a boundary portion between the binding portion and the non-binding portion on the rear end side is in a range of 10 ° to 40 °. The endoscope according to claim 1, 2, 3, or 4, wherein a fixing agent is applied to a surface of the elastic wire at an end portion of the binding portion adjacent to the non-binding portion to bind the elastic wire. Wire loop treatment tool. 6. The wire loop treatment device for an endoscope according to claim 1, wherein three or more elastic wires are provided to form a wire loop of the basket-type foreign matter collection device. 6. The wire loop treatment device for an endoscope according to claim 1, wherein two elastic wires are provided to form a high-frequency snare wire loop. 8. The two elastic wires are formed of a single wire as a material, and a bonding agent is applied at the tip, and the two wires are substantially bound there. Wire loop type treatment instrument for an endoscope.

Images