JP3732995B2 - Endoscope operation wire connecting part - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an operation wire connecting portion of an endoscope treatment tool that is inserted into a treatment tool insertion channel of an endoscope and used for performing medical treatment or the like in a body cavity.
[0002]
[Prior art]
Many endoscope treatment tools are designed to be operated by operating a distal end actuating member arranged at the distal end with an operation wire that is advanced and retracted from the hand side. For example, in an endoscopic biopsy forceps, etc. There is one that is engaged through an end of an operation wire in an engagement hole that is formed by penetrating through a plate-like portion of the tip actuating member.
[0003]
Among those employing such a technique, the one shown in Japanese Patent Application Laid-Open No. 11-17829 discloses that the tip of the operation wire is formed in a continuous ring shape and is formed in an engagement hole formed in the tip working member. Through the ring-shaped part of the operation wire.
[0004]
Further, in the one disclosed in European Patent No. 491890, the operation wire 81 passed through the engagement hole 83 is bent before and after the engagement hole 83.
[0005]
[Problems to be solved by the invention]
However, the one disclosed in Japanese Patent Application Laid-Open No. 11-178829 is extremely difficult to process and assemble because the tip of the operation wire must be formed into a continuous ring shape after passing through the engagement hole. Lack.
[0006]
Further, what is shown in European Patent No. 491890 is that the operation wire 81 is simply bent before and after the engagement hole 83, so that a strong external force acts on the tip actuating member or a strong traction force acts on the operation wire 81. When the action is applied, the bent portion may extend straight and the operation wire 81 may come out of the engagement hole 83.
[0007]
In view of the above, the present invention provides processing and assembly in an operation wire connecting portion of an endoscope treatment tool that is engaged through an end of an operation wire with an engagement hole penetrating through a plate-like portion of a distal end working member. An object of the present invention is to provide an operation wire connecting portion of a treatment instrument for an endoscope which is simple and highly practical and can obtain a sufficient strength that does not disengage.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the operation wire connecting portion of the endoscope treatment instrument of the present invention has an operation wire inserted in and removed from a sheath inserted into and removed from the treatment instrument insertion channel of the endoscope in the axial direction. An operation wire connecting portion of an endoscopic treatment tool configured to drive a distal end working member disposed at the distal end of the sheath by advancing and retracting, and penetrating through a plate-like portion of the distal end working member. In the case where the engagement hole is engaged through the distal end of the operation wire, a large-diameter portion of a size that cannot pass through the engagement hole is provided at the distal end of the operation wire that extends from the distal end of the sheath. The operation wire is bent toward the distal end of the sheath on the other end side of the engagement hole in a state where the large diameter portion is inserted into contact with the end of the engagement hole.
[0009]
The large-diameter portion may be formed by curing in a state where the tip portion of the operation wire itself is inflated. In that case, the thick-diameter portion is formed by being melt-cured in a state where the tip portion of the operation wire itself is inflated. Also good.
[0010]
Further, the large-diameter portion may be formed by fixing a spherical piece to the tip portion of the operation wire, or may be formed by fixing a hook-shaped member to the tip portion of the operation wire.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
FIG. 2 shows an endoscopic biopsy forceps. A flexible sheath 1 inserted into and removed from a treatment instrument insertion channel of an endoscope (not shown) has, for example, a stainless steel wire with a constant diameter. The coil pipe is tightly wound.
[0012]
An operation wire 2 is inserted through the entire length of the sheath 1 so as to advance and retract in the axial direction. As the operation wire 2, for example, a stranded wire obtained by twisting a plurality of fine stainless steel wires is used.
[0013]
An operation portion (not shown) for moving the operation wire 2 forward and backward is connected to the proximal end (right side in FIG. 2) of the sheath 1, and the distal end support member 3 connected and fixed to the distal end of the sheath 1 is connected to the distal end support member 3. The tip actuating member (forceps cup 5 and link plate 6) driven by the operation wire 2 is supported.
[0014]
The distal end support member 3 is formed with a slot 3a extending from the distal end to the vicinity of the proximal end, and the forceps cup 5 and the link plate 6 are rotatably supported by a support shaft 4 arranged so as to cross the vicinity of the distal end. ing.
[0015]
The forceps cup 5 and the link plate 6 are integrally formed and provided in two pairs. The forceps cup 5 opens and closes in a hook shape in front of the distal end support member 3 around the support shaft 4. The link plate 6 is disposed in the slot 3a, and the distal end of the operation wire 2 is connected in the vicinity of the rear end portion thereof.
[0016]
Since the operation wire 2 is connected to each of the pair of link plates 6, two wires are provided as a pair, and the two wires are twisted in the sheath 1 so that the two operation wires 2 operate together. It is matched. However, a configuration in which the sheath 1 is connected to another operation wire may be adopted.
[0017]
FIG. 1 shows a connecting portion between one link plate 6 and the distal end portion of the operation wire 2. The other link plate 6 and the like are arranged at symmetrical positions with respect to the axis of the tip support member 3, but the illustration thereof is omitted.
[0018]
An engagement hole 7 having a diameter slightly larger than the diameter of the operation wire 2 is formed in the link plate 6 so as to penetrate the plate surface. A tapered hole-like shape is formed at the opening end on the outer surface side of the engagement hole 7. A recess 8 is formed.
[0019]
The operation wire 2 extends from the distal end of the sheath 1, is passed through the engagement hole 7 so that the distal end is located in the recess 8, and comes into the slit 3 a from the end on the back side of the engagement hole 7. At the position, it is bent at a substantially right angle along the back surface of the engagement hole 7 toward the distal end of the sheath 1.
[0020]
A large-diameter portion 20 having a size that cannot pass through the engagement hole 7 is formed at the tip of the operation wire 2 located in the recess 8. The large-diameter portion 20 is open to the bottom of the recess 8. It is almost in contact with the end of the.
[0021]
In this embodiment, the large diameter portion 20 is formed by curing in a state where the tip portion of the operation wire 2 itself is expanded. Specifically, the end portion of the stranded wire forming the operation wire 2 is melted by an arc or plasma and melted and cured into a thick spherical shape. By performing such melting in an inert gas such as argon gas, for example, deterioration of the operation wire 2 due to oxidation can be prevented.
[0022]
The large-diameter portion 20 formed in this way is not formed by connecting other parts to the operation wire 2 but is formed by the end portion of the operation wire 2 itself, so that even if a strong external force is applied, the operation wire 2 It does not come off from it and has excellent strength.
[0023]
The operation wire connecting portion of the endoscope treatment tool according to the embodiment thus configured is highly practical because it is easy to process and assemble the structure in which the operation wire 2 is engaged with the link plate 6, and is thick. Since the diameter portion 20 does not come out of the engagement hole 7, it is possible to obtain a sufficient engagement strength that prevents the tip of the operation wire 2 from coming off the link plate 6.
[0024]
The large diameter portion 20 formed at the distal end of the operation wire 2 may be formed by brazing a metal spherical piece or the like to the distal end portion of the operation wire 2 and fixing it by welding or caulking.
[0025]
FIG. 3 shows a connecting portion between the link plate 6 and the distal end portion of the operation wire 2 according to a reference example of the present invention. The operation wire 2 is disposed between the inner wall surface of the split 3 a and the large diameter portion 20 is substantially in contact with the inner surface side of the link plate 6. With this configuration, when the forceps cup 5 is opened and closed, there is no possibility that the large-diameter portion 20 hits the edge of the slit 3a.
[0026]
FIG. 4 shows a connecting portion between the link plate 6 of another reference example of the present invention and the distal end portion of the operation wire 2, and the large diameter portion 20 is made of a metal bowl-shaped member at the distal end portion of the operation wire 2. It is formed by fixing.
[0027]
The flange-shaped member that forms the large-diameter portion 20 is formed in a shape in which a flange having a diameter larger than the diameter of the engagement hole 7 protrudes from one end side of the tubular portion that is loosely inserted into the engagement hole 7. The flange portion is housed in a recess 8 formed in a countersink shape. And the other end side of the bowl-shaped member which forms the large diameter part 20 protrudes inward of the slot 3a from the other end side of the engagement hole 7. FIG.
[0028]
In addition, this invention is not limited to the said Example, For example, you may apply this invention to various treatment tools for endoscopes other than the biopsy forceps for endoscopes.
[0029]
【The invention's effect】
According to the present invention, the operation wire extending from the distal end of the sheath is provided with the large-diameter portion having a size that cannot pass through the engagement hole formed in the plate-like portion of the distal end working member. The operation wire is bent toward the distal end of the sheath on the other end side of the engagement hole in a state where the large diameter portion is inserted into the joint hole and the end of the engagement hole is in contact with the end of the engagement hole. Processing and assembly of the engaging portion with the tip actuating member are simple and highly practical, and sufficient strength can be obtained so that the engaged state is not released.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional plan view of a distal end portion of an endoscopic biopsy forceps according to a first embodiment of the present invention.
FIG. 2 is a side partial sectional view of a distal end portion of an endoscopic biopsy forceps according to a first embodiment of the present invention.
FIG. 3 is a plan partial sectional view of a distal end portion of an endoscopic biopsy forceps according to a reference example of the present invention.
FIG. 4 is a plan partial sectional view of a distal end portion of an endoscopic biopsy forceps according to another reference example of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Sheath 2 Operation wire 3 Tip support member 3a Slot 5 Forceps cup (tip action member)
6 Link plate (tip working member)
7 Engagement hole 20 Large diameter part

Claims (4)

An operation wire disposed in the sheath inserted into and removed from the treatment instrument insertion channel of the endoscope is moved forward and backward in the axial direction to drive the distal end actuating member disposed at the distal end of the sheath. In an operation wire connecting portion of a treatment instrument for an endoscope, which is engaged through an end of the operation wire in an engagement hole formed through and penetrating the plate-like portion of the distal end working member.
The front end of the operation wire extending from the distal end of the sheath, the large diameter portion of the size that can not pass through the engaging hole provided with inflating the distal portion of the operating wire itself, the size thereof large diameter portion fits of of a recess formed on one end side of the engagement hole, the large diameter portion and the operation wire is inserted into the engagement hole in a state in which accommodated within the recess, said the other end side of the engagement hole An operation wire connecting portion of a treatment instrument for an endoscope, wherein the operation wire is bent toward the distal end of the sheath. 2. The operation wire connecting portion of the endoscope treatment instrument according to claim 1, wherein the large-diameter portion is formed by curing in a state in which a distal end portion of the operation wire itself is inflated. The operation wire connecting portion of the endoscope treatment instrument according to claim 2, wherein the large diameter portion is formed by melting and hardening in a state in which a distal end portion of the operation wire itself is expanded. 4. The operation wire connecting portion of the endoscope treatment instrument according to claim 1, wherein the concave portion is formed in a tapered hole shape that gradually expands outward on one end side of the engagement hole .

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