JP3599801B2 - Endoscope treatment tool processing apparatus and processing method - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to an endoscope treatment tool processing apparatus and a processing method for forming a distal end portion of an endoscope treatment tool made of a metal stranded wire.
[0002]
[Prior art]
Generally, as a device for bending a metal stranded wire or wire, for example, a device disclosed in Japanese Patent Application Laid-Open No. Sho 62-179840 is known. In this apparatus, a wire is bent in an arc shape by repeating a pressing force in a direction perpendicular to an axis at a tip portion while feeding the wire in an axial direction.
[0003]
By the way, an endoscope treatment tool made of a metal stranded wire is used for performing treatment with an endoscope, and cuts an affected part by high frequency. For this reason, in order to improve the sharpness of the affected part, the distal end portion of the endoscope treatment tool has a shape as shown in FIG. It requires an endoscope treatment tool processing device equipped with a mechanism for forming the same shape.
[0004]
Conventionally, a distal end portion of an endoscope treatment tool is formed by such an endoscope treatment tool processing apparatus as shown in FIGS. 6 and 7.
In the apparatus shown in the drawing, one convex mold 103 constituting a pair of molding dies is fixed to a fixed base 106. Further, a cylinder 105 is fixed to the fixed base 106, and the other concave mold 101 constituting a molding die is attached to the cylinder 105 via a shaft 110. Thereby, the concave mold 101 can freely approach and separate from the convex mold 103. The convex 103 has a convex portion 103a formed at the center of the upper surface thereof for forming the metal stranded wire 104, and the concave die 101 has a concave portion 101a formed at the center of the lower surface thereof for forming the metal stranded wire 104. It is formed in a position and a shape that can be fitted with the convex portion 103a.
[0005]
In order to perform molding with the endoscope treatment tool processing apparatus having such a configuration, a metal stranded wire 104 as an endoscope treatment tool material is attached to the convex 103 with tension. Then, the cylinder 105 is driven to lower the concave mold 101, and the metal stranded wire 104 is pressed by the convex mold 103 and the concave mold 101 to form a predetermined shape.
[0006]
[Problems to be solved by the invention]
However, there is a problem that the shape of the distal end portion of the treatment tool after the molding is distorted in the molding by the molding die having the above configuration. This problem will be described with reference to FIG.
The metal stranded wire 104, which is a material for an endoscope treatment tool, is formed by winding a plurality of fine metal wires around each other, so that the metal stranded wire is oblique to the axial direction of the metal stranded wire 104 (the vine winding direction). Line streaks are formed. Therefore, it has the property of being easily deformed along these streaks, and it is shown in FIG. 8B from the state before pressing shown in FIG. As in the state after the pressing, a deformation is generated in the direction of the arrow. After forming, the twisted metal wire 104 has a twisted shape as shown in FIG. With such a distal end shape, when the affected part is cut by a high frequency with an endoscope treatment tool, the sharpness is poor, and good treatment cannot be performed.
[0007]
SUMMARY OF THE INVENTION The present invention has been made in view of the above-described conventional problems, and is formed so that a distal end shape of an endoscope treatment tool is not kinked and an endoscope treatment which can obtain a treatment instrument of stable quality. It is an object to provide a tool processing device and a processing method.
[0008]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the invention according to claim 1 is an endoscope treatment tool processing apparatus for press-molding a distal end portion of an endoscope treatment tool made of a metal stranded wire using a pair of molding dies. At least one of the molding dies is provided with a regulating portion for regulating the metal stranded wire to a predetermined position in order to prevent kinking of the metal stranded wire during pressure molding.
[0009]
According to a second aspect of the present invention, in the endoscope treatment tool processing apparatus according to the first aspect, the restricting portion includes two pins located on opposite sides of the metal stranded wire.
[0010]
According to a third aspect of the present invention, in the endoscope treatment tool processing apparatus according to the first aspect, the restricting portion includes a groove in which the metal stranded wire is engaged.
The invention according to claim 4 is a method for processing an endoscope treatment tool in which a distal end portion of an endoscope treatment tool made of a metal stranded wire is pressure-formed by a pair of molding dies. A regulating portion for regulating the metal stranded wire at a predetermined position to prevent twisting of the metal stranded wire at the time of pressure forming is provided, a metal stranded wire is attached to a forming die provided with the regulating portion, tension is applied, and the regulating portion is used. The method is characterized in that the metal stranded wire is pressurized with a pair of forming dies to form a curved shape without twisting while regulating the position of the metal stranded wire.
[0011]
[Action]
In the endoscope treatment tool processing apparatus and processing method of the present invention, since the regulating portion that regulates the metal stranded wire at a predetermined position during pressure molding is provided, even if the metal stranded wire is deformed, the deformation is regulated, Molding can be performed without causing kinking.
[0012]
【Example】
[Example 1]
1 and 2 are a front view and an enlarged view of a main part (A part) showing an endoscope treatment tool processing apparatus according to a first embodiment, respectively. A processing method will also be described based on this processing apparatus.
(Constitution)
In the endoscope treatment tool processing apparatus of the present embodiment, one of the convex molds 3 constituting a pair of molding dies is fixed to a lower portion of a fixed base 6 vertically supported on a floor surface by a member not shown. ing. Further, a cylinder 5 is fixedly provided on the upper part of the fixed base 6, and the other concave mold 1 constituting a molding die is attached to the cylinder 5 via a shaft 10. As a result, the concave mold 1 can freely move toward and away from the convex mold 3. At the center of the upper surface of the convex mold 3, a convex portion 3a is formed which extends perpendicularly to the mounting surface of the fixing base 6 and forms the metal stranded wire 4. On the other hand, in the concave mold 1, a concave portion 1a for forming the metal stranded wire 4 is formed at a position and a shape that can be fitted with the convex portion 3a at the center of the lower surface.
[0013]
Further, a metal stranded wire 4 is hung around the convex portion 3a so as to be hooked on the convex portion 3a, and a weight 9 is attached to a lower end of the metal stranded wire 4, and the metal stranded wire 4 is pulled downward. And is hung loosely on the convex 3.
[0014]
Further, as shown in FIG. 2, on the upper surface of the convex mold 3, a phase which is located on the opposite side with the convex portion 3 a interposed therebetween and shifted by the wire thickness of the metal stranded wire 4 with the metal stranded wire 4 interposed therebetween. Pins 11 are provided at opposite positions. The pair of pins 11 is a pin with a head, is inserted into a pin hole 3b provided in the projection 3, and is constantly urged upward by a spring 12 provided in the pin hole 3b. The pin hole 3b is a stepped hole having a large diameter portion and a small diameter portion, and the head of the pin 11 is engaged with the step portion of the pin hole 3b so that the pin 11 cannot be pulled out. The pin 11 is formed to have such a length that its tip (upper end) is at a position higher than the metal stranded wire 4 hung on the convex 3. Reference numeral 13 denotes a support plate attached to the bottom surface of the convex 3 so that the spring 12 and the like do not fall off.
[0015]
(Action)
In order to perform the forming processing by the endoscope treatment tool processing apparatus of the present embodiment having the above-described configuration, first, the concave mold 1 is lowered via the shaft 10 by the pressure of the cylinder 5. Then, the concave mold 1 is pressed toward the convex mold 3 so that the convex portion 3a of the convex mold 3 and the concave portion 1a of the concave mold 1 are fitted. At this time, the metal stranded wire 4 is formed so as to follow the shape thereof while being sandwiched between the convex portion 3a and the concave portion 1a. Along the line (in FIG. 2, the direction of the arrow). However, the pin 11 stands at the position to be deformed, and the metal stranded wire 4 is sandwiched between the two pins 11 to suppress the deformation.
[0016]
During molding, the pin 11 sinks into the pin hole 3b against the urging force of the spring 12 while suppressing deformation of the metal stranded wire 4 when the lower surface of the concave mold 1 is pressed against the tip. When the concave mold 1 is raised, the pin 11 protrudes upward due to the restoring force of the spring 12.
[0017]
(effect)
According to the present embodiment, it is possible to prevent deformation of the metal stranded wire 4 along the crease at the time of molding, and it is possible to mold and process a stable quality endoscope treatment tool.
[0018]
In the first embodiment, the pin 11 sinks into the pin hole 3b when the concave mold 1 is pressed to the convex mold 3 side. However, as shown in FIG. May be fixed to the upper surface, and a hole 1b of an escape portion into which the pin 11 can be fitted may be provided on the lower surface of the concave mold 1.
[0019]
[Example 2]
FIG. 4 is a perspective view showing the convex mold 3 of the endoscope treatment tool processing apparatus according to the present embodiment. The other configuration is the same as that of the first embodiment, and illustration and description thereof are omitted.
(Constitution)
In this embodiment, grooves (notches) 3 d having a width substantially equal to the diameter of the metal stranded wire 4 are formed in the R portions on both sides of the upper surface of the convex mold 3. The metal stranded wire 4 is engaged with and hung in the groove 3d, and the position of the metal stranded wire 4 is regulated.
[0020]
(Action)
In order to perform the forming process by the endoscope treatment tool processing apparatus of the present embodiment having the above configuration, similarly to the first embodiment, the concave mold is formed so that the convex portion 3a of the convex mold 3 and the concave concave portion are fitted. Press against the convex 3 side. At this time, as described above, the metal stranded wire 4 tries to deform along the crease of the metal wire, but the position is regulated in the groove 3d, and the deformation is suppressed.
[0021]
(effect)
According to the present embodiment, it is possible to prevent deformation of the metal stranded wire 4 along the streaks during molding with a simple configuration, and it is possible to mold and process a stable quality endoscope treatment tool.
[0022]
【The invention's effect】
As described above, according to the endoscope treatment tool processing apparatus and the processing method of the present invention, it is possible to obtain a treatment tool of stable quality by shaping the endoscope treatment tool so that the distal end shape of the treatment tool does not become kinked. it can.
[Brief description of the drawings]
FIG. 1 is a front view showing an endoscope treatment tool processing apparatus according to a first embodiment.
FIG. 2A is a plan view and FIG. 2B is a partially cutaway front view showing a main part of the endoscope treatment tool processing apparatus according to the first embodiment.
FIG. 3 is a front view of a main part showing a modification of the first embodiment.
FIG. 4 is a perspective view showing a convex shape of the endoscope treatment tool processing apparatus according to the second embodiment.
FIG. 5 is a front view showing a distal end of the endoscope treatment tool.
FIG. 6 is a perspective view showing a conventional endoscope treatment tool processing apparatus.
FIG. 7 is a front view showing a conventional endoscope treatment tool processing apparatus.
FIG. 8 is a plan view of relevant parts for explaining deformation due to conventional molding.
[Explanation of symbols]
1,101 concave mold 1a, 101a concave 3,103 convex mold 3a, 103a convex 3d groove 4,104 metal stranded wire 11 pin

Claims (4)

In an endoscope treatment tool processing apparatus that press-molds the distal end portion of an endoscope treatment tool made of a metal stranded wire using a pair of molds, at least one of the pair of molds has a An endoscope treatment tool processing device, further comprising a restricting portion for restricting the metal stranded wire to a predetermined position in order to prevent twisting of the metal stranded wire. The endoscope treatment tool processing apparatus according to claim 1, wherein the restricting portion includes two pins located on opposite sides of the metal stranded wire. The endoscope treatment tool processing device according to claim 1, wherein the restricting portion is formed of a groove with which a metal stranded wire engages. In an endoscope treatment tool processing method in which a distal end portion of an endoscope treatment tool made of a metal stranded wire is pressure-formed by a pair of molding dies, one of the pair of molding dies is provided with a metal stranded wire during pressure molding. A regulating portion for regulating the metal stranded wire to a predetermined position to prevent kinking is provided, the metal stranded wire is attached to a molding die provided with the regulating portion, tension is applied, and the position of the metal stranded wire is regulated by the regulating portion. A method for processing an endoscope treatment tool, wherein the metal stranded wire is pressed by a pair of forming dies to form a curved shape without kinking.

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