JP3722578B2 - Operation wire - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an operation wire used as a bending operation wire for bending a bending portion of an endoscope, for example.
[0002]
[Prior art]
In general, an endoscope includes an insertion portion that is inserted into a body cavity and an operation portion that is provided at a proximal end portion of the insertion portion, and a set of two bending operation wires that are inserted into the insertion portion. The bending portion of the insertion portion is bent by pushing and pulling with a bending operation knob provided on the bending portion.
[0003]
A conventional bending operation wire used for such an endoscope requires flexibility in bending of the bending portion and strength against tensile stress applied by the bending operation. For example, as shown in JP-A-4-224727 A plurality of strands are bundled. Specifically, a plurality of outer lines are formed in a spiral shape on the outer periphery of the core wire, and the core wire and the outer line are generally formed of the same material such as SUS and bend along with the bending of the bending portion. It is like that.
[0004]
The bending operation wire is inserted through a guide coil inserted in an insertion portion of an endoscope and is guided so as to freely advance and retreat as disclosed in, for example, Japanese Patent Publication No. 62-41022. The guide coil is formed by closely winding a strand having a circular cross-sectional shape. When the insertion portion is bent, the guide coil is bent accordingly.
[0005]
[Problems to be solved by the invention]
However, the insertion portion of the endoscope is required to have a small diameter in order to reduce the burden on the patient, and the bending operation wire is also thinned along with the reduction in the diameter of the insertion portion. Although the bending operation wire with a small diameter can obtain flexibility in bending of the bending portion, there is a possibility that the bending operation wire may be broken by a tensile force applied by the bending operation. That is, the bending operation wire moves forward and backward while being guided by the guide coil at the proximal side portion inserted through the flexible portion of the insertion portion. For this reason, the proximal side portion of the bending operation wire slides with the inner peripheral portion of the guide coil every time it is operated, and frictional resistance is added. Therefore, the bending operation wire is easily broken at the proximal side portion by repeated use. There's a problem.
[0006]
The present invention has been made paying attention to the above circumstances, and an object of the present invention is to provide an operation wire having a large breaking force even when the operation wire is small in diameter and having flexibility at the time of bending. There is.
[0007]
[Means for Solving the Problems]
The present invention, in order to achieve the above object, according to claim 1, the first wire consists of a single wire, while being formed by bundling a plurality of wires, the plurality of element bundled in operation wire, characterized in that the end face of the line; and a second wire bonded to the end face of a single wire of the first wire.
In a second aspect of the present invention, the first wire formed of a single wire, the second wire formed by bundling a plurality of strands, and the second formed by the plurality of strands bundled . An operation wire comprising: a joining portion for joining the end face of the first wire to the end face of the first wire made of a single wire.
A third aspect of the present invention is combined with an endoscope having a bending portion formed by rotatably connecting a plurality of node rings and a flexible tube portion formed of a soft tube on the proximal end side of the bending portion. An operation wire for bending the bending portion, and is formed by bundling a plurality of strands with a first wire that is inserted into the flexible tube portion and is formed of a single wire. An end face of the wire is joined to an end face of the first wire, and a second wire having flexibility that is inserted into the bending portion and bent according to a bending operation of the bending portion. Features.
A fourth aspect of the present invention is combined with an endoscope having a bending portion formed by rotatably connecting a plurality of node rings and a flexible tube portion formed of a soft tube on the proximal end side of the bending portion. An operation wire for bending the bending portion, which is inserted into the flexible tube portion so as to be able to advance and retreat, and is formed by bundling a plurality of strands with a first wire made of a single wire. And a second wire that is inserted into the bending portion and has a flexibility to bend according to the bending operation of the bending portion, and the second wire to transmit the advance / retreat operation of the first wire to the second wire. It has the junction part which joins the end surface of the 1st wire, and the end surface of the 2nd wire, It is characterized by the above-mentioned.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
1 to 4 show the first embodiment, FIG. 1 is a side view of an endoscope operation wire, FIG. 2 is a sectional view of the endoscope operation wire, and FIG. 3 is a side view of the entire endoscope. 4 is a cross-sectional view of the insertion portion. As shown in FIG. 3, the endoscope includes an insertion portion 1 that is inserted into a body cavity, and an operation portion 2 that is provided on the proximal end side of the insertion portion 1. The insertion portion 1 is composed of a distal end configuration portion 3, a bending portion 4, and a flexible portion 5. The operation portion 2 is provided with a bending operation knob 6 for bending the bending portion 4.
[0009]
As shown in FIG. 4, the bending portion 4 has a bending tube 9 in which a plurality of node rings 7 are rotatably connected by pins 8, and a blade (not shown) is provided on the outer periphery of the bending tube 9. The protective tube 11 is covered via The distal end of the bending tube 9 is connected to the distal end constituting portion 3, and the proximal end is connected to a flexible tube 12 constituting the flexible portion 5 via a connecting tube 10.
[0010]
Further, a plurality of wire guides 13 projecting inward are provided on the inner wall of the node ring 7, and a set of two operation wires 14 are inserted through these wire guides 13 so as to be able to advance and retract. Both distal ends of the operation wire 14 are connected to the front end node ring 7 or the distal end configuration portion 3, the midway portion is inserted through the flexible tube 12, and the proximal end portion is connected to a drum (not shown) in the operation portion 2. The drums are wound from opposite sides, and the drum is rotated by the bending operation knob 6. The bending portion 4 can be bent in the left-right direction or the up-down direction by pushing and pulling the operation wire 14 with the bending operation knob 6.
[0011]
Next, the operation wire 14 which is the main part of this invention is demonstrated based on FIG. 1 and FIG. The operation wire 14 is formed by connecting a wire 17 formed by bundling a plurality of strands 16 and a wire 18 made of a single wire by laser welding 14a in a state where the end surfaces are in contact with each other. Specifically, the plurality of strands 16 are formed by spirally winding a plurality of outer wires 16b of the same material on the outer periphery of a core wire 16a such as SUS, and the wire 18 made of a single wire is also formed of the same material. ing. Moreover, the wires 17 and 18 are formed with substantially the same diameter.
[0012]
A wire 17 formed by bundling a plurality of strands 16 is flexible and is inserted into the bending portion 4 of the endoscope. The wire 8 made of a single wire is flexible and has a large breaking force because it has a larger cross-sectional area than the wire 17, and the guide coil 19 made of a closely wound coil built in the flexible portion 5. And is wound around a drum.
[0013]
According to the operation wire 14 configured as described above, when the drum is rotated by operating the bending operation knob 6, one of the two sets of operation wires 14 is wound around the drum and the other is fed out of the drum. . Therefore, the bending portion 4 is bent in the left-right direction or the up-down direction by pushing and pulling the operation wire 14.
[0014]
At this time, since the flexible wire 17 is bent as the bending portion 4 is bent, the bending resistance (operation force amount) does not increase. On the other hand, the wire 18 falls from the wire 17 in terms of flexibility, but the flexible portion 5 is not extremely curved and has flexibility, and has a large amount of breaking force. Therefore, there is no fear of breakage. Therefore, even if the operation wire 14 is made thinner due to a request for reducing the diameter of the insertion portion 1 of the endoscope, a large tensile strength can be obtained.
[0015]
Further, according to the first embodiment, the operation wire 14 is connected by the laser welding 14a with the wire 17 formed by bundling a plurality of strands 16 and the wire 18 made of a single wire in contact with each other at the end surfaces. For this reason, there is no portion where the diameter of the connecting portion of the operation wire 14 is increased, and there is an effect that the operation can be smoothly performed without interfering with other members when the operation wire 14 is advanced or retracted.
[0016]
FIG. 5 shows a second embodiment, in which the operation wire 14 is formed by bundling a plurality of strands 16 and the wire 18 made of a single wire is brought into contact with each other (it is not necessary to make contact). At the same time, a metal connection pipe 20 is fitted to the outside of the contact portion, and the connection pipe 20 is crimped to connect the wire 17 and the wire 18. According to this embodiment, there exists an effect that the connection of the wire 17 and the wire 18 can be performed easily.
[0017]
FIG. 6 shows a third embodiment. A wire 17 formed by bundling a plurality of strands 16 of an operation wire 14 and a wire 18 made of a single wire are brought into contact with each other, and the contact portion thereof is brazed 21. It is connected. Note that soldering or an adhesive may be used instead of the brazing 21.
[0018]
In each of the above-described embodiments, the operation wire for bending the bending portion of the insertion portion has been described as the endoscope operation wire. However, the operation wire may be adopted as a forceps raising operation wire for operating the forceps raising stand. It can also be used in a treatment instrument that is inserted into a forceps channel of an endoscope and treats an affected part in a body cavity, and is not limited to an internal operation force.
[0019]
According to the embodiment, the following configuration is obtained.
(Supplementary note 1) An operation wire characterized by connecting end faces of a wire formed by bundling a plurality of strands and a wire made of a single wire.
[0020]
(Supplementary note 2) An operation wire characterized in that a wire formed by bundling a plurality of strands and a wire made of a single wire are connected with their end faces in contact with each other.
(Supplementary note 3) The operation according to supplementary note 1, wherein at least a portion built in the bending portion of the endoscope is a wire formed by bundling a plurality of strands, and the proximal side is a wire made of a single wire. Wire.
[0021]
(Supplementary note 4) The operation wire according to supplementary note 1, wherein a wire formed by bundling a plurality of strands and a wire made of a single wire have substantially the same diameter.
(Additional remark 5) The operation wire of Additional remark 1 characterized by welding the wire which formed by bundling a some strand, and the wire which consists of a single wire in the state which contact | abutted end surfaces.
[0022]
(Additional remark 6) The operation wire of Additional remark 1 characterized by connecting the wire which formed by bundling a some strand, and the wire which consists of a single wire with the connection pipe in the state which contact | abutted end surfaces.
[0023]
(Supplementary note 7) The operation wire according to supplementary note 1, wherein a wire formed by bundling a plurality of strands and a wire made of a single wire are brazed in a state where the end faces are in contact with each other.
FIG. 7 shows a first disclosed example, and the same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted. A stopper 22 made of a short tube with a bottom is provided in the operation unit 2. An insertion hole 23 through which the wire 18 made of a single wire constituting the operation wire 14 is inserted is provided at the bottom of the stopper 22.
[0024]
A retaining member 24 made of a pipe is fixed to the outer peripheral surface of the proximal end portion of the guide coil 19 that guides the wire 18 by means such as adhesion, soldering, or brazing. The retaining member 24 has a larger diameter than the insertion hole 23 of the stopper 22, the rear end surface of the retaining member 24 abuts against the stopper 22, the guide coil 19 falls into the insertion hole 23, and the operation wire 14 cannot be moved forward and backward. Is prevented.
[0025]
Thus, by providing the retaining member 24 at the base end portion of the guide coil 19, there is no need to replace the stopper 22 according to the outer diameter of the guide coil 19, and there is an effect that the common stopper 22 can be used.
[0026]
FIG. 8 shows a second disclosed example, and the same components as those in the first disclosed example are given the same reference numerals and the description thereof is omitted. On the outer peripheral surface of the proximal end portion of the guide coil 19 that guides the wire 18, a retaining member 25 composed of a huge portion is provided. The retaining member 25 is formed by means such as adhesion, soldering, or brazing. The retaining member 25 is formed to have a larger diameter than the insertion hole 23 of the stopper 22, and the rear end surface of the retaining member 25 is The guide coil 19 falls into the insertion hole 23 in contact with the stopper 22 to prevent the operation wire 14 from moving forward and backward. Therefore, the same effect as the first disclosed example can be obtained.
[0027]
【The invention's effect】
As described above, according to the present invention, the operation wire is formed by bundling a plurality of strands and the wire made of a single wire by connecting the end faces to each other, so that the operation wire has a small diameter. However, there is an effect that the amount of breaking force is large and flexibility at the time of bending can be obtained.
[Brief description of the drawings]
FIG. 1 is a side view of an operation wire showing a first embodiment of the present invention.
2A is a cross-sectional view taken along line AA in FIG. 1, and FIG. 2B is a cross-sectional view taken along line BB in FIG.
FIG. 3 is a side view of the entire endoscope according to the embodiment.
FIG. 4 is a longitudinal side view of the insertion portion of the embodiment.
FIG. 5 is a side view of an operation wire according to a second embodiment of the present invention.
FIG. 6 is a side view of an operation wire according to a third embodiment of the present invention.
FIG. 7 is a longitudinal side view in an operation unit showing a first disclosed example.
FIG. 8 is a longitudinal side view in an operation unit showing a second disclosed example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Insertion part 2 ... Operation part 5 ... Bending part 6 ... Flexible part 14 ... Operation wire 16 ... Elementary wire 17 ... Wire 18 formed by bundling a plurality of element wires ... Wire consisting of a single wire

Claims (4)

A first wire composed of a single wire;
A second wire formed by bundling a plurality of strands and having end surfaces of the bundled strands joined to an end surface made of a single wire of the first wire;
An operation wire comprising: A first wire composed of a single wire;
A second wire formed by bundling a plurality of strands;
A joining portion for joining the end face of the second wire formed by the bundled strands to the end face of the first wire made of a single wire ;
An operation wire comprising: Combined with an endoscope provided with a bending portion formed by rotatably connecting a plurality of node rings and a flexible tube portion formed of a flexible tube on the proximal end side of the bending portion, the bending portion is An operation wire for bending operation,
A first wire that is inserted into the flexible tube and is formed of a single wire;
Flexibility that is formed by bundling a plurality of strands, and that the end surface of the strand is joined to the end surface of the first wire, inserted into the bending portion, and bent according to the bending operation of the bending portion. A second wire comprising:
An operation wire comprising: Combined with an endoscope provided with a bending portion formed by rotatably connecting a plurality of node rings and a flexible tube portion formed of a flexible tube on the proximal end side of the bending portion, the bending portion is An operation wire for bending operation,
A first wire that is inserted into the flexible tube portion so as to be movable back and forth, and is formed of a single wire;
A second wire having a flexibility that is formed by bundling a plurality of strands and is inserted into the bending portion and bent according to a bending operation of the bending portion;
A joint that joins an end face of the first wire and an end face of the second wire in order to transmit the advance / retreat operation of the first wire to the second wire;
An operation wire comprising:

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