JP2004041319A - Wire for medical appliance - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a low-cost wire for an endoscope dispensing with a joining process such as soldering and improving the durability by forming a soft part in one part region of a single-type twisted wire. <P>SOLUTION: This wire for the endoscope is formed by winding a plurality of circumferential wires 7 around a single shaft core wire 6. The shaft core wire 6 in one part region in the region sequentially disposed with the circumferential wires 7 is removed so as to be formed into the softer region than the other regions. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a cleaning brush for cleaning the inside of a channel of an endoscope, a wire member in a treatment tool such as forceps to be inserted into a body cavity through a channel of the endoscope and used for medical treatment, or an endoscope. The present invention relates to a medical device wire used in the field of an endoscope, such as a wire member as an operation wire incorporated in a mirror itself.
[0002]
[Prior art]
An endoscope cleaning brush for cleaning the inside of an endoscope channel includes a long wire member, and a brush portion is attached to a distal end of the wire member. The treatment tool for an endoscope also includes a long wire member. A wire member for operating the treatment instrument raising table and the like and a wire member for operating the bending portion are also used for the endoscope itself.
[0003]
[Problems to be solved by the invention]
Generally, since an endoscope, particularly an insertion portion, is long, a wire member of an instrument used for the endoscope becomes long. In addition, since the endoscope bends or rounds the insertion portion, the insertability and operability of the wire member are easily impaired. Therefore, a wire member was proposed in which two types of wire strands having different hardnesses were joined back and forth to change the hardness of the front and rear portions of the wire member so as to enhance the insertability and operability.
[0004]
However, in this method, the two wires are connected using methods such as soldering, welding, brazing, caulking, etc., so the connection part where the two wires are connected is affected by heat deterioration and stress concentration, This part is the most fragile part. In addition, the wire member of this method has a drawback that the manufacturing process is complicated, the manufacturing cost is increased, and the wire member becomes expensive.
[0005]
The present invention has been made with a focus on the above circumstances, and its purpose is to form a flexible portion in a part of the entire wire member region without connecting and joining a plurality of wire portions, thereby obtaining an overall strength. Another object of the present invention is to provide a medical device wire capable of improving its durability and inexpensiveness.
[0006]
[Means for Solving the Problems]
The invention according to claim 1 has a plurality of wire strands including at least one wire strand continuously arranged from the distal end to the proximal end, and partially changes the form of at least one wire strand. A medical device wire, wherein a soft region and a hard region are formed in the axial direction of the wire.
The invention according to claim 2, wherein the plurality of wire strands are formed as a stranded wire by winding a plurality of peripheral strands around one or more shaft core wires. It is a wire for medical instruments.
The invention according to claim 3 is the medical device wire according to claim 1 or 2, wherein the wire element that changes the form is thin in a soft region and thick in a hard region.
The invention according to claim 4 is the medical device wire according to claim 1 or 2, wherein the wire element that changes the form is removed in the soft region.
According to a fifth aspect of the present invention, at least a part of the core wire in the region where at least one wire wire of the shaft wire and the surrounding wire is continuously arranged from the front end to the base end is removed. 3. The medical device wire according to claim 2, wherein the region from which a part of the axis is removed is a soft region.
The invention according to claim 6 is characterized in that the wire element that changes the form is a peripheral element wire wound around the axis core, and the angle wound around the axis core is changed to form a soft region and a hard region. Item 2. The medical device wire according to Item 2.
The invention according to claim 7 is that the wire element that changes the form is a peripheral element wire wound around a shaft core wire, and the outer diameter of the shaft core wire is partially changed to form a soft region and a hard region. It is the wire for medical instruments of Claim 2 characterized by the above-mentioned.
The invention according to claim 8 is the medical instrument wire according to any one of claims 1 to 7, wherein the wires are formed of a metal material having the same characteristics.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
<First embodiment>
A cleaning brush for an endoscope according to a first embodiment of the present invention will be described with reference to FIGS.
[0008]
(Constitution)
The present embodiment relates to an endoscope cleaning brush, and FIG. 1 schematically shows the entire endoscope cleaning brush 1. The cleaning brush 1 has a metal wire member 2, a brush part 3 is fixedly attached to a tip of the wire member 2, and a hand operation part 4 is attached to a rear end of the wire member 2. . The brush part 3 is connected to the tip of the wire member 2 via a joining member 5.
[0009]
The wire member 2 has a plurality of wires (wire material), and as shown in FIG. 2, a so-called 1 × 7 wire in which six peripheral wires 7 are wound around one shaft core wire 6. It consisted of a twisted stranded wire, and a specific wire element was subjected to the following processing. The six peripheral wires 7 are continuously arranged from the distal end to the proximal end of the wire member 2.
[0010]
However, the axis 6 is removed in a certain length range from the end on the brush part 3 side, and this area is made to be a wire part having a different form from other areas. For this reason, the portion of the wire portion of the wire member 2 that does not have the axis 6 is softer than the portion of the wire that has the axis 6.
[0011]
FIG. 3A shows a cross section of the flexible portion, which is a wire portion where the axial core wire 6 does not exist, cut along the line AA ′ in FIG. FIG. 3B shows a cross-sectional form of the hard portion, which is the wire portion where the axial core wire 6 exists, cut along the line BB ′ in FIG. 2.
[0012]
Here, it is preferable that both the shaft core wire 6 and the surrounding element wire 7 are formed of the same kind of material having similar physical characteristics, and the wire member 2 has at least the shaft core wire 6 having a high bending strength and a bending habit. It is desirable to use a hard-to-stick material. In addition, as a material of these wire strands, a stainless wire, a Ni-Ti alloy wire, or another metal material can be used.
[0013]
The method of winding the surrounding element wire 7 around the shaft core wire 6 may be so-called Z twist or reverse S twist. Further, a winding type suitable for an endoscope or a treatment tool, such as a 1 × 12 twist or a 1 × 19 twist, may be used. In this case as well, a wire member having the same structure can be formed by removing the axial core wire as described above. Further, in the structure of the wire member 2, if the vicinity of the end of the shaft core wire 6 is fixed to the surrounding element wire 7 by soldering or covered with a ring-shaped protective material, the end of the shaft core wire 6 becomes peripheral. The possibility of jumping out of the wire 7 can be reduced.
[0014]
(Action)
When the cleaning brush 1 using the wire member 2 having the above structure is used, the wire member 2 is inserted into the endoscope channel from the brush portion 3 side, and is pushed into the endoscope channel.
[0015]
Since the distal region without the axis 6 is a softer region than the proximal region with the axis 6, even if the endoscope channel into which the cleaning brush 1 is to be inserted is bent or curved, Alternatively, even if the endoscope insertion portion is bent and the endoscope channel disposed therein is bent, the followability is excellent, and the cleaning brush 1 is not caught in the endoscope channel, and the endoscope is not caught. The cleaning brush 1 can be easily passed through the channel, and the inner wall of the pipe inserted by the wire member 2 is not easily damaged.
[0016]
In addition, since the proximal portion of the wire member 2 has a structure including the axis 6, it is formed to be harder than a distal portion not including the axis 6. For this reason, the pushing force applied from the hand is easily transmitted to the tip, and the transmission performance of the pushing force is good. Therefore, it becomes easy to insert the cleaning brush 1 deep inside the endoscope channel.
[0017]
In addition, since the proximal portion includes the axis 6, the ability to transmit the rotational force when the wire member 2 is twisted is high. Since the rotational force applied on the hand side can be easily transmitted to the brush section 3 as the distal treatment section, an effective cleaning operation such as moving the brush section 3 forward and backward can be easily and reliably performed. And the cleaning ability by the brush part 3 can be improved.
[0018]
Since the wire member 2 does not have a joining portion connecting the two stranded wires to form a soft portion on the distal end side, the strength and durability of the wire member 2 are not impaired. In the case of the conventional type in which two stranded wires are connected, the joint portion is easily broken due to the influence of heat deterioration or stress concentration, but the wire member 2 in the present embodiment does not have the drawback.
[0019]
If a superelastic wire (Ni-Ti alloy wire) storing a linear shape is used for the axial core wire 6 (and / or the surrounding element wire 7), even if it is inserted into and removed from a curved conduit, The wire member 2 maintains linearity, and the wire member 2 is unlikely to bend and habit even if the cleaning brush 1 is repeatedly inserted and removed.
[0020]
(effect)
The wire member 2 can form a soft portion having no shaft core 6 and a relatively hard portion having the shaft core 6, and at the same time, the surrounding strands 7 are continuous over the entire length of the wire member 2. Therefore, the overall strength and durability can be secured with a simple and inexpensive structure.
[0021]
<Second embodiment>
A wire member according to a second embodiment of the present invention will be described with reference to FIG.
[0022]
(Constitution)
The wire member of the present embodiment is a so-called 1 × 7 twist wire in which six peripheral wires 7 are wound around one shaft core wire 6 as in the first embodiment described above. However, in a required range of a certain length from the end portion of the stranded wire, the surrounding strand 7 is removed by cutting or the like, and the region is a soft portion. One shaft core wire 6 is arranged continuously from the distal end to the proximal end of the wire member 2.
[0023]
(Action)
Since the wire member of the present embodiment is of a type in which the shaft core wire 6 is left and the surrounding wires 7 are removed, a longer flexible portion can be easily formed than in the case of the above-described first embodiment.
[0024]
(effect)
With the above configuration, as in the first embodiment, the strength and durability are high while having a simple and inexpensive structure. In addition, the same effect in use as a wire member in which two types of stranded wires are joined can be obtained in terms of insertability into a conduit.
[0025]
<Third embodiment>
The wire member according to the third embodiment of the present invention will be described with reference to FIG.
[0026]
(Constitution)
In the present embodiment, in the case of manufacturing the wire member, when winding the surrounding wire 7 around the shaft core wire 6, the feed speed of the shaft wire is reduced from the middle, and the winding angle of the surrounding wire 7 with respect to the shaft wire 6 is increased. The configuration of the surrounding strands 7 is changed. That is, the braid angle of the surrounding strands 7 is different between the distal portion 8 and the proximal portion 9.
[0027]
By lowering the feed speed of the shaft core wire 6, the braid angle of the peripheral element wire 7 of the distal end portion 8 approaches a direction perpendicular to the shaft core wire 6. For this reason, the winding form is changed even if the diameter of the wire itself is not changed, and the resistance of the surrounding wire 7 in the bending direction in the distal end portion 8 decreases, and this portion becomes a flexible portion. In addition, the proximal portion 9 becomes a hard portion as compared with its soft portion.
[0028]
(Action)
In this embodiment, the wire member 2 is formed by dividing the region of the soft portion and the hard portion by changing the braid angle such as the winding angle of the surrounding strands 7 in the stage of the manufacturing process.
[0029]
(effect)
According to the present embodiment, the following effects are obtained in addition to the effects of the first embodiment. First, by continuously changing the feed speed of the shaft core wire in the stranded wire manufacturing process, it is possible to easily form a flexible portion not only at the wire end but also at the center. Further, by changing the feeding speed stepwise, the wire member 2 whose softness is changed stepwise or continuously can be formed.
[0030]
<Fourth embodiment>
A wire member according to a fourth embodiment of the present invention will be described with reference to FIGS.
[0031]
(Constitution)
This embodiment is a modification of the above-described first embodiment. As shown in FIG. 6, the diameter of the shaft core wire 6 in the range is reduced by drawing or polishing in a certain length range from the end of the shaft core wire 6 of the wire member 2, and the reduced diameter portion 6a , The peripheral wire 7 is wound around the entire circumference of the shaft core wire 6 over the entire length. The region where the diameter of the shaft core wire 6 is reduced becomes a soft portion, whereas the portion corresponding to the region having the same thickness without being reduced in diameter becomes a hard portion. FIG. 7A is a cross-sectional view of the soft part taken along line AA ′ in FIG. 6, and FIG. 7B is a cross-sectional view of the hard part taken along line BB in FIG. FIG. 3 is a cross-sectional view cut along a line. The shaft core wire 6 and the surrounding wires 7 are arranged continuously from the distal end to the proximal end of the wire member 2.
[0032]
(Action / Effect)
According to the present embodiment, the following effects are obtained in addition to the effects of the above-described first embodiment. That is, as compared with the first embodiment, the tensile strength of the flexible portion of the terminal portion is higher, and buckling against bending is less likely to occur. Further, there is no possibility that the end of the shaft core wire 6 protrudes from the surrounding strand 7.
[0033]
<Fifth embodiment>
A wire member according to a fifth embodiment of the present invention will be described with reference to FIG.
[0034]
(Constitution)
The wire member 2 of the present embodiment is formed by twisting a plurality of strands 7 having no core. In the region on the distal end side of the wire member 2, a part of the wire 7 is removed, and only the distal end of the wire 7a is formed over the entire length from the distal end to the proximal end. As shown in FIG. 8 (B), the base region of the wire member 2 is a rigid portion formed by twisting three strands 7, and the base region of the wire member 2 is shown in FIG. As shown in ()), it is a soft portion having only one strand 7a. During the transition from the three strands 7 to one strand 7a, the leading end of the strand 7 to be removed is gradually narrowed, and is wound around the outer periphery of the remaining strand 7a to prevent fraying.
[0035]
FIG. 8B is a cross-sectional view showing a hard portion of the wire member 2 cut along a line BB ′ in FIG. 8A, and FIG. FIG. 9 is a cross-sectional view taken along line CC ′ in FIG. 8A. One strand 7 a is continuously arranged from the distal end to the proximal end of the wire member 2.
[0036]
(Action)
The distal end region from which some of the wires 7 have been removed becomes thin and soft, forming a soft region. In addition, the base end region where the strand 7 is not removed is thicker and harder than the front end region. Further, since some of the wires 7a are continuous over the entire length of the wire member 2, the strength and durability of the entire wire member are secured. Since the distal region is thin and soft, and the proximal region is thick and harder than the distal region, the functionality as a wire for a medical device is enhanced.
[0037]
<Sixth embodiment>
A wire member according to a sixth embodiment of the present invention will be described with reference to FIG.
[0038]
(Constitution)
The wire member 2 of the present embodiment is formed by twisting a plurality of strands 7 having no core. As shown in FIG. 9 (C), each element wire 7 is gradually thinned in the distal end side region of the wire member 2 to form a tapered and soft region. The proximal end region of the wire member 2 is relatively thick as shown in FIG.
[0039]
Although the number of each strand 7 is not limited, three strands 7 are used here. The three strands 7 are arranged continuously from the distal end to the proximal end of the wire member 2.
[0040]
FIG. 9B is a cross-sectional view showing a hard portion of the wire member 2 cut along a line BB ′ in FIG. 9A, and FIG. FIG. 10 is a cross-sectional view showing a portion taken along a line CC ′ in FIG. 9A.
[0041]
(Action)
In the present embodiment, in order to make all the wires 7 thin in the front end region, a soft soft region in which the front end region is thin is formed. On the proximal end side, all the wires 7 remain thick, and the proximal end region is thicker and harder than the distal end region. In this embodiment, since each of the wires 7 is positioned and continuous over the entire length of the wire member 2, the load is distributed to each of the wires 7.
[0042]
(effect)
In the present embodiment, since the individual wires 7 are continuously arranged over the entire length from the distal end to the proximal end of the wire member 2, the load is distributed to the individual wires 7 and the strength and durability of the entire wire member are secured. Further, the distal region is thin and soft, and the proximal region is thick and harder than the distal region, so that the strength of the wire member 2 can be secured and the functionality as a medical device wire is enhanced.
[0043]
Note that the present invention is not limited to the above-described embodiments, and can be modified in other forms. The present invention is also applicable to a wire member used as an operation wire of a treatment tool for an endoscope that remotely performs a treatment on a subject. The present invention is also applicable to an operation wire for a bending operation of an endoscope or a treatment instrument raising operation. In the case of a wire member used as a treatment tool or an operation wire of an endoscope, the wire member is inserted into a guide tube or the like so as to be able to advance and retract. If a plurality of wires are used, the wires may not be twisted. In addition, the following supplementary notes are also obtained.
[0044]
<Supplementary note> In a medical device wire formed as a stranded wire by winding a plurality of peripheral wires around one or a plurality of shaft core wires,
At least one material of the shaft core wire and the surrounding wire is continuously arranged from the distal end to the base end, and the form of at least one wire wire of the shaft core wire and the surrounding wire is partially changed. A wire for a medical device, wherein a soft region and a hard region are formed in an axial direction.
[0045]
【The invention's effect】
As described above, according to the present invention, it is possible to provide a medical device wire capable of forming a soft part in a partial region of a wire member including a continuous wire strand, and has strength and durability. It is possible to provide an inexpensive medical instrument wire with high flexibility.
[Brief description of the drawings]
FIG. 1 is a side view schematically showing an entire endoscope cleaning brush according to a first embodiment of the present invention.
FIG. 2 is a side view of a wire member of the endoscope cleaning brush according to the first embodiment of the present invention.
3A is a cross-sectional view taken along line AA ′ in FIG. 2, and FIG. 3B is a cross-sectional view taken along line BB ′ in FIG.
FIG. 4 is a side view of an endoscope wire member according to a second embodiment of the present invention.
FIG. 5 is a side view of an endoscope wire member according to a third embodiment of the present invention.
FIG. 6 is a side view of an endoscope wire member according to a fourth embodiment of the present invention.
7A is a sectional view taken along line AA ′ in FIG. 6, and FIG. 7B is a sectional view taken along line BB ′ in FIG.
FIG. 8A is a side view of an endoscope wire member according to a fifth embodiment of the present invention, FIG. 8B is a cross-sectional view taken along line BB ′ in FIG. FIG. 3C is a cross-sectional view taken along line CC ′ in FIG.
9A is a side view of an endoscope wire member according to a sixth embodiment of the present invention, FIG. 9B is a cross-sectional view taken along line BB ′ in FIG. 9A, FIG. 3C is a cross-sectional view taken along line CC ′ in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Cleaning brush 2 ... Wire member 3 ... Brush part 4 ... Operating part 5 ... Joining member 6 ... Shaft core wire 7 ... Surrounding wire 8 ... Soft part 9 ... Hard part

Claims (8)

Having a plurality of wire strands including at least one wire strand continuously arranged from the distal end to the proximal end, partially changing the form of at least one wire strand, and a soft region in the wire axis direction A wire for a medical device, wherein a hard region is formed. 2. The medical device wire according to claim 1, wherein the plurality of wire strands are formed as a stranded wire by winding a plurality of peripheral strands around one or more shaft core wires. 3. The medical device wire according to claim 1, wherein the wire element that changes the form is thin in a soft region and thick in a hard region. The medical device wire according to claim 1, wherein the wire element that changes the form is removed in the soft region. At least a part of the core in the region where at least one wire of the shaft core and the peripheral wire is continuously arranged from the distal end to the base end is removed to remove this part of the core. The medical device wire according to claim 2, wherein the formed region is a soft region. The medical device wire according to claim 2, wherein the wire element that changes the form is a peripheral element wire wound around the axis core, and the angle wound around the axis core is changed to form a soft region and a hard region. 3. The medical device according to claim 2, wherein the wire element that changes the form is a peripheral element wire wound around the shaft core wire, and the outer diameter of the shaft core wire is partially changed to form a soft region and a hard region. Instrument wire. The medical device wire according to any one of claims 1 to 7, wherein the wire element is formed from a metal material having the same characteristics.

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