JP5701626B2 - Treatment tool - Google Patents

Description

The present invention relates to a processing置具.

Conventionally, a treatment instrument wire is used in a treatment instrument used for medical purposes, for example, a treatment instrument such as a snare, a high-frequency knife, a basket forceps, and a grasping forceps used in a body cavity. These treatment tools are often used by being inserted into an endoscope.
Examples of the types of treatment instrument wires include operation wires for advancing and retracting a treatment section provided at the distal end of these treatment instruments and operating the operation of the treatment section. This operation wire is inserted into a sheath that is inserted into a treatment instrument channel of the endoscope and advanced and retracted, and is connected to a treatment section that performs treatment on the distal end side.
In addition, examples of other types of treatment instrument wires include a wire (hereinafter referred to as a treatment section wire) that is provided at the distal end of an operation wire in a snare, a basket forceps, and the like and constitutes a treatment section. Can do.
As a configuration of such a wire for a treatment instrument, for example, Patent Document 1 uses a stranded wire in which metal strands such as stainless steel (SUS) and nickel titanium (Ni—Ti) alloy are twisted together. Patent Document 2 describes an endoscope operation wire composed of a 1 × 7 stranded wire in which six single wires are twisted together in a spiral. It is also described that this endoscope operation wire may be used as an operation wire for various endoscope treatment tools. Stainless steel fine wires are used for the single wires of the endoscope operation wires.
Moreover, although it is not a wire for treatment tools, in patent document 3, the amorphous metal fine wire formed from the amorphous alloy containing Fe-Co-Cr-Si-B is used as a 7-stranded strand. Is described.

JP 2004-41319 A JP 2000-152911 A Japanese Patent Publication No. 7-103439

However, the conventional wires for treatment tools and treatment tools as described above have the following problems.
In the treatment instrument inserted through the endoscope, the operation wire is used by being advanced and retracted in a sheath that bends similarly in accordance with the bending of the endoscope.
In addition, for example, in the case of a snare or basket forceps, the treatment portion wire has a distal end formed in a loop shape, and the proximal end portion is connected to the operation wire and advances and retracts to the sheath, thereby changing the loop diameter, Wrap around tissue and crush stones. In addition, when the endoscope is inserted, the endoscope is folded to a size that fits in the sheath. In this manner, the treatment portion wire is repeatedly bent or repeatedly subjected to stress load.
For example, an operation wire made of a SUS or Ni—Ti alloy stranded wire as described in Patent Document 1 repeatedly receives a compressive force or a tensile force, so that plastic deformation occurs in the operation wire, and over time. It is known that the wire length increases. When elongation occurs in the operation wire, there is a problem that an error occurs in the displacement and load transmitted to the operation target through the operation wire, which hinders the operation of the treatment instrument. In the treatment part wire, there exists a problem that treatment will become incomplete.
Patent Document 2 describes a technique for applying a residual stress by twisting each single wire of an endoscope operation wire to smoothly transmit a rotational force and suppress a phenomenon of rotating due to the action of tension. ing. However, since plastic deformation cannot be suppressed, there is a problem that it is not possible to suppress the occurrence of elongation due to repeated operations.
In addition, as in the technique described in Patent Document 3, it is conceivable that each strand constituting the stranded wire is made of an amorphous alloy that hardly causes plastic deformation and hardly stretches. Since the twisted stranded wire is difficult to be plastically deformed, the adhesion between the strands in the twisted state is poor, and there is a problem that durability against bending required for the treatment instrument wire cannot be obtained.
In the unlikely event that such a stranded wire breaks during use, the amorphous alloy is rich in elasticity, so that the cut end is scattered and the sharp end spreads, causing damage to the sheath or from the sheath. There is a risk of penetrating the endoscope and projecting into the body cavity.

The present invention has been made in view of the above problems, even after repeated operations or treatment operation of the treatment tool, hardly occurs elongation of the wire for treatment instrument, and Ru excellent durability against bending treatment The purpose is to provide a fixture.

In order to solve the above problems, the treatment instrument of the present invention includes a treatment portion for performing treatment to the living tissue, a treatment instrument wire formed by stranding a plurality of metal strands, the plurality of metal-containing The wire includes a first strand and a second strand, the breaking elongation of the first strand is 5% or less, and the breaking elongation of the second strand is 20% or more. And

In the treatment tool of the present invention, the first strand is made of a metallic glass that is an amorphous alloy having a glass transition region of 20K or more, and the second strand is made of stainless steel or nickel-titanium. It is preferably made of an alloy.

In the treatment instrument of the present invention, it is preferable that the first strand is made of zirconium-based metallic glass.

In the treatment instrument of the present invention, the first strand and the second strand are twisted to form at least one strand, and the outer peripheral surface of the strand is the second strand. It is preferable that the first strand is arranged at the center of the strand.

In the treatment tool of the present invention, the first strand and the second strand are twisted together to form at least one strand, and the outer circumferential surface of the strand is circumferential. It is preferable that the first strands and the second strands are alternately arranged along the first strand, and the first strands are arranged at the center of the strand.

In the treatment tool of the present invention, a wire outer peripheral surface is formed by the second strand, and a single wire of the first strand or a stranded wire body of the first strand is disposed at the center of the wire. It is preferable.

In the treatment tool in which the single strand of the first strand of the present invention or the stranded wire body of the first strand is disposed at the wire center portion, the first strand disposed at the wire center portion is It is preferable that the diameter is equal to or larger than the diameter of the second strand.

  Moreover, in the treatment tool of this invention, it has an operation wire which operates the said treatment part, and it is preferable that this operation wire is equipped with the said wire for treatment tools.

  Moreover, in the treatment instrument in which the operation wire of the present invention includes the treatment instrument wire of the present invention, the treatment instrument wire is a part of the treatment instrument wire or the metal strand of the metal strand. It is preferable that an extended portion obtained by extending the twisted body from the wire end portion is provided, and at least a part of the treatment portion is constituted by the extended portion.

  Moreover, in the treatment tool of this invention, it is preferable that the said treatment part is equipped with the said wire for treatment tools.

In the treatment instrument of the present invention, the first strand of the treatment instrument wire is made of a metallic glass that is an amorphous alloy having a glass transition region of 20K or more, and the first strand is heated. It is preferable to provide a caulking and caulking fixing portion by an intermediate press.
Moreover, in the treatment tool of this invention, it has an operation wire which operates the said treatment part, and it is preferable to perform a treatment by the said treatment part being pulled by the said operation wire.

According to processing置具of the present invention, elongation at break the structure of the wire treatment instrument elongation at break and the first wire of less than 5% is a structure formed by stranding a second wire of more than 20% Therefore, even if the operation of the treatment instrument and the treatment operation are repeated, the treatment instrument wire is hardly stretched, and the bending resistance is excellent.

The fragmentary sectional view which shows the structure of the principal part of the treatment tool which concerns on the 1st Embodiment of this invention. It is the elements on larger scale of the a section. It is the typical front view which shows the structure of the wire for treatment tools which concerns on the 1st Embodiment of this invention, and its AA sectional drawing. It is a schematic diagram explaining the bending test method used for evaluation of the wire for treatment tools which concerns on the 1st Embodiment of this invention. It is typical sectional drawing which shows the structure of the wire for treatment tools which concerns on the 1st modification of the 1st Embodiment of this invention. It is the typical front view which shows the structure of the wire for treatment tools which concerns on the 2nd modification of the 1st Embodiment of this invention, and its BB sectional drawing. It is typical sectional drawing which shows the structure of the wire for treatment tools which concerns on the 3rd-5th modification of the 1st Embodiment of this invention. It is typical sectional drawing which shows the structure of the wire for treatment tools which concerns on the 6th, 7th modification of the 1st Embodiment of this invention. It is typical sectional drawing which shows the structure of the wire for treatment tools which concerns on the 8th-10th modification of the 1st Embodiment of this invention. It is typical sectional drawing which shows the structure of the wire for treatment tools which concerns on the 11th, 12th modification of the 1st Embodiment of this invention. It is typical sectional drawing which shows the structure of the wire for treatment tools which concerns on the 13th modification of the 1st Embodiment of this invention. It is typical sectional drawing which shows the structure of the wire for treatment tools which concerns on the 14th-16th modification of the 1st Embodiment of this invention. It is typical sectional drawing which shows the structure of the wire for treatment tools which concerns on the 17th and 18th modification of the 1st Embodiment of this invention. It is typical sectional drawing which shows the structure of the wire for treatment tools which concerns on the 19th modification of the 1st Embodiment of this invention. It is typical sectional drawing which shows the structure of the wire for treatment tools which concerns on the 20th, 21st modification of the 1st Embodiment of this invention. It is typical sectional drawing which shows schematic structure of the treatment tool which concerns on the 2nd Embodiment of this invention. It is a perspective view which shows the structure of the wire for treatment tools which concerns on the 2nd Embodiment of this invention. It is a front view which shows the structure of a part of wire for treatment tools which concerns on the 2nd Embodiment of this invention. It is a perspective view for demonstrating the process of bending the wire for treatment tools which concerns on the 2nd Embodiment of this invention. It is the typical front view which shows the structure of the wire for treatment tools used for the treatment tool which concerns on the 3rd Embodiment of this invention, and its DD sectional drawing. It is typical sectional drawing which shows the cross section of the connection part of the wire for treatment tools and treatment part of the treatment tool which concerns on the 3rd Embodiment of this invention, and typical sectional drawing which shows the manufacturing process of a connection part. It is typical process explanatory drawing which shows the joining process of the front-end | tip junction part of the treatment tool which concerns on the 3rd Embodiment of this invention.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. In all the drawings, even if the embodiments are different, the same or corresponding members are denoted by the same reference numerals, and common description is omitted.

[First Embodiment]
A wire for a treatment tool and a treatment tool according to a first embodiment of the present invention will be described.
Fig.1 (a) is a fragmentary sectional view which shows the structure of the principal part of the treatment tool which concerns on the 1st Embodiment of this invention. FIG.1 (b) is the elements on larger scale of the a part in Fig.1 (a). Fig.2 (a) is a typical front view which shows the structure of the wire for treatment tools which concerns on the 1st Embodiment of this invention. FIG.2 (b) is AA sectional drawing in Fig.2 (a).

The snare 40, which is a treatment tool of the present embodiment, is a medical instrument that removes living tissue such as an affected part in a body cavity by flowing a high-frequency current.
As shown in FIG. 1A, the schematic configuration of the snare 40 includes a sheath 41, a snare wire 43 (treatment part wire), and an operation wire 42.

The sheath 41 is a member that allows the snare 40 to be inserted into a treatment instrument channel of an endoscope (not shown) and allows the snare wire 43 and the operation wire 42 to be inserted therein, and is smaller than the inner diameter of the treatment instrument channel of the endoscope. It has an outer diameter, a snare wire 43 in a folded state, and an inner diameter through which the operation wire 42 can be inserted, and is made of an elongated tube member having flexibility.
As the material of the sheath 41, a synthetic resin material having electrical insulation and heat resistance can be employed. In this embodiment, polytetrafluoroethylene (PTFE) having a heat resistant temperature of about 300 ° C. is employed.

The snare wire 43 has a loop shape whose inner diameter can be changed at the distal end of the sheath 41, for example, a circular shape, an elliptical shape, a pear shape, a spindle shape, a polygonal shape, and the like, and a living tissue such as an affected part is held in the loop. In this state, it is a member that constitutes a treatment section for excising living tissue by supplying a high-frequency current.
In this embodiment, the shape of the snare wire 43 is a shape that draws a substantially spindle-shaped loop in a state where no external force acts.
In this embodiment, as an example, by bending a single metal stranded wire from the center, arc-shaped curved portions 43R and 43L that are curved in a C shape, and a U-shape that connects these arc-shaped curved portions 43R and 43L The tip end bending portion 43b is formed, and the wire end portions 43a and 43c, which are the ends opposite to the tip bending portion 43b of the arc-shaped bending portions 43R and 43L, are fixed by the caulking portion 44.

Caulking portion 44, as shown in FIG. 1 (b), was inserted through the end portion of the wire ends 43a, 43 c and the operating wire 42 of the snare wire 43, for example by pressing a tube member made of SUS304 formed It has been done. The outer diameter of the caulking portion 44 is smaller than the inner diameter of the sheath inner surface 41a of the sheath 41, and the outer surface of the caulking portion 44 is a smooth surface that can slide smoothly with the sheath inner surface 41a.

The operation wire 42 is an elongated metal stranded wire that performs an operation of moving the snare wire 43 forward and backward from the end of the sheath 41 and supplies a high-frequency current to the snare wire 43 while the snare wire 43 holds the affected part. is there.
In the present embodiment, one end of the operation wire 42 is connected to the snare wire 43 by the caulking portion 44, and the other end is extended from the opposite end portion of the sheath 41 (not shown). (Both not shown) are mechanically and electrically connected to each other.

The snare wire 43 and the operation wire 42 may have different wire configurations, but the wire configuration is common in this embodiment.
That is, the snare wire 43 and the operation wire 42 of the present embodiment are formed by bending or cutting the treatment instrument wire 1 shown in FIGS. 2 (a) and 2 (b).

As shown in FIGS. 2 (a) and 2 (b), the configuration of the treatment instrument wire 1 is centered on a first strand 2 (first strand) made of a metal strand as a core (wire core). Then, on the outer periphery of the first strand 2, six second strands 3 (second strands) made of metal strands made of a material different from that of the first strand 2 are twisted in a spiral shape to form an outer layer. It is the strand wire which comprised the part 4A. For this reason, the wire 1 for treatment tools consists of one strand by seven metal strands.
Below, the structure of a stranded wire will be represented by N × M, where N is the number of strands and M is the number of strands constituting each strand. The treatment instrument wire 1 of the present embodiment is a 1 × 7 wire.
The twist direction of the treatment instrument wire 1 is not particularly limited, but FIG. 2A shows an example of Z twist.
Each second strand 3 is in close contact with the other second strand 3 adjacent in the circumferential direction. For this reason, the outer layer portion 4A covers the first strand 2 from the side without a gap. Therefore, the outer peripheral surface of the treatment instrument wire 1 is constituted only by the second strand 3.

  In addition, in Fig.1 (a), although the 1st strand 2 has shown the form which protruded from the edge part of 4 A of outer layer parts for easy viewing, the edge part shape of the wire 1 for treatment tools is according to a use. The shape can be adopted as appropriate. For example, as shown in FIG. 1 (b), at the ends of the snare wire 43 and the operation wire 42, the first strand 2 and each second strand 3 are trimmed so as to be aligned with one end face. Yes. However, in the use of the end of the operation wire 42 (not shown) and other treatment tools, end parts (not shown) may be fixed by welding, caulking, or the like, or may be integrally formed.

The material of the first strand 2 and the second strand 3 is selected so that the breaking elongation is 5% or less in the case of the first strand 2 and the breaking elongation is 20% or more in the case of the second strand 3. . Here, the elongation at break is determined by a test method defined by JIS Z2241, and is expressed as a percentage.
A metal material having a small breaking elongation is less likely to cause plastic deformation than a metal material having a larger breaking elongation.
In general, an amorphous alloy (non-crystalline metal material) is less susceptible to plastic deformation and has a smaller elongation at break than a crystalline metal (crystalline metal material). In particular, an amorphous alloy known as metallic glass has high elasticity and high strength, so that it can be thinned and is a suitable material for the first strand 2 in the treatment instrument wire 1.
Examples of suitable metal materials for the second strand 3 include stainless steel wires such as SUS304, nickel-titanium (Ni-Ti) alloys, and the like.

Metallic glass is an amorphous alloy in which the glass transition point is clearly observed when the temperature rises, and the temperature range of the supercooled liquid region between the glass transition point and the crystallization temperature, that is, the glass transition region is An alloy with 20K or more.
Examples of the material of the metallic glass include a zirconium (Zr) based alloy, an iron (Fe) based alloy, a titanium (Ti) based alloy, a magnesium (Mg) based alloy, a copper (Cu) based alloy, and the like.
Metallic glass melts a metal base material having a constant composition to form a melt of the base material alloy, and the molten metal is cooled below the critical transition rate of the base material alloy to below the glass transition point of the base material alloy. It is formed by making it amorphous by cooling.
Specifically, examples where the composition (atm%) is Zr ₅₅ Cu ₃₀ Al ₁₀ Ni ₅ or Zr ₆₀ Cu ₂₀ Al ₁₀ Ni ₁₀ can be given. Since these amorphous alloy materials are mainly composed of Zr, they are excellent in mold transferability and can be easily formed into complex shapes. Moreover, since nickel (Ni) is added, these are excellent also in chemical resistance.
For example, an amorphous alloy material mainly composed of titanium (Ti) is also suitable. For example, Ti ₄₀ Zr ₁₀ Cu ₃₆ Pd ₁₄ can be mentioned. This material is particularly excellent in biocompatibility, and is a material suitable for an endoscope part used in direct contact with the human body.
Examples of the Cu-based alloy include a composition (atm%) of Cu ₆₀ Zr ₃₀ Ti ₁₀ or the like.

Table 1 below shows specific examples of metal materials suitable as the first strand 2 or the second strand 3 together with numerical values of elongation at break (%) and stress at break (MPa). MG represents metallic glass. For example, “MG (Zr group)” means a metallic glass of a Zr-based alloy.
Table 2 shows specific resistance data for reference.

As shown in Table 1, Zr-based alloy (Zr ₅₅ Cu ₃₀ Al ₁₀ Ni ₅ ), Fe-based alloy (Vorfa (registered trademark) manufactured by Unitika Ltd.), Cu-based alloy (Cu ₆₀ Zr ₃₀ ), which are metallic glasses. (Elongation at break and breaking stress) of Ti ₁₀ ) are (1.8%, 1800 MPa), (3%, 3500 MPa), and (4.3%, 3500 MPa), respectively.
On the other hand, the crystalline metal material SUS304, the Ni-Ti alloy superelastic material, and the Ni-Ti alloy annealed material (breaking elongation, breaking stress) are (40%, 520 MPa) and (20, respectively). %, 1500 MPa) and (60%, 1000 MPa).
Thus, it can be seen that the metallic glass has significantly smaller breaking elongation and larger breaking stress than the crystalline metallic material.

In the present embodiment, as an example, the first strand 2 has Zr ₅₅ Cu ₃₀ Al ₁₀ Ni ₅ (electric resistivity: 240 μΩ · cm), and the second strand 3 has SUS304 (electric resistivity: 70 μΩ · cm). Thereby, since the electrical resistivity of the 2nd strand 3 which comprises 4A of outer layers is low compared with the 1st strand 2, the electrical resistance as a whole of the snare wire 43 and the operation wire 42 is reduced. Yes.
In the present embodiment, the first strand 2 and the second strand 3 have the same diameter. The size of the wire diameter can be appropriately adopted depending on the use of treatment or operation. For example, in the case of the snare 40, a diameter of 0.3 mm to 0.7 mm is suitable. In this embodiment, a diameter of 0.4 mm is adopted.
However, these configurations are merely examples, and as the second strand 3, a Ni-Ti superelastic material (electrical resistivity: 90 μΩ · cm) having a breaking elongation of 20% is also preferable instead of SUS304 because of its low electric resistivity. Can be used.
Moreover, as shown in Table 2, since the Fe-based alloy (Vorfa (registered trademark) manufactured by Unitika Ltd.) has a lower electrical resistivity than Zr ₅₅ Cu ₃₀ Al ₁₀ Ni ₅ , Zr ₅₅ Cu ₃₀ Al ₁₀ Ni If it uses as the 1st strand 2 replaced with ₅ , the electrical resistance as the whole of the snare wire 43 and the operation wire 42 can further be reduced.

Next, the operation of the snare 40 will be described.
Drawing 3 is a mimetic diagram explaining the bending test method used for evaluation of the wire for treatment implements concerning a 1st embodiment of the present invention.

The usage method of the snare 40 is the same as that of the conventional snare. That is, the operation wire 42 is pulled to house the snare wire 43 in the sheath 41, and in this state, the distal end of the sheath 41 is guided into the body cavity by being inserted into the treatment instrument channel of the endoscope. At this time, since the endoscope is curved in the body cavity, the sheath 41 and the snare wire 43 and the operation wire 42 accommodated therein are inserted while being bent along the curve of the treatment instrument channel together with the insertion operation.
When the endoscope reaches the vicinity of the affected part to be treated, the end of the sheath 41 is pushed out of the endoscope, and the operation wire 42 is advanced to the distal end side. As a result, the snare wire 43 is pushed out from the distal end of the sheath 41 to restore the loop shape.
In order to remove the affected area with the snare 40, the inside of the snare wire 43 is operated by operating the bending portion of the endoscope to move the distal end portion of the endoscope or by extending the sheath 41 to the distal end side. Locate the affected area. Next, the position of the sheath 41 is fixed, the operation wire 42 is pulled back to the hand side, the diameter of the snare wire 43 is reduced, and the affected part is held. Next, while passing a high-frequency current through the operation wire 42, the operation wire 42 is further pulled toward the hand side to reduce the diameter of the snare wire 43 .
Since the snare wire 43 is electrically connected to the operation wire 42, the living tissue at the position in contact with the snare wire 43 is cauterized by the high-frequency current, cut along with the reduced diameter of the snare wire 43, and the affected part is excised.

In addition, when energizing the snare wire 43 and the operation wire 42, in this embodiment, since the 1st strand 2 is metallic glass, it uses on the conditions that the 1st strand 2 does not exceed a glass transition point. There is a need. The glass transition point of the Zr-based alloy of the embodiment is 490 ° C.
On the other hand, in this embodiment, PTFE having a heat resistant temperature of about 300 ° C. is used for the sheath 41, and the temperature of the operation wire 42 in use is lower than 300 ° C., and therefore does not exceed the glass transition point. The condition is fully satisfied. Therefore, the first strand 2 is not softened or crystallized during use.

By repeatedly performing such treatment, the snare wire 43 and the operation wire 42 of the snare 40 are subjected to repeated loads such as bending, pulling, and compression.
In this embodiment, since the treatment instrument wire 1 is adopted for the snare wire 43 and the operation wire 42, for example, even if such a repeated load is applied, for example, a conventional SUS wire or Ni-Ti alloy wire Durability can be improved compared to a wire for a treatment instrument made of only.

Hereinafter, the operation of the treatment instrument wire 1 will be described based on evaluation results of manufacturing the treatment instrument wires of specific examples and comparative examples and performing repeated bending tests.
In the treatment instrument wire 1, the metal material of the first strand 2, which is a core wire, is made of a material having a smaller elongation at break than the metal material of the second strand 3 constituting the outer layer portion 4 </ b> A. The first strand 2 can resist the elastic force almost elastically. Even if plastic deformation is performed, the amount of plastic deformation is smaller than that in the case of only the second strand 3.
For this reason, the treatment instrument wire 1 is elongated even when the insertion operation of the treatment instrument into the endoscope or the treatment operation of the affected area is repeated, as compared with the stranded wire composed only of a metal wire having a large elongation at break. The connected amount of plastic deformation in the longitudinal direction can be reduced.

In addition, the repeated bending stress received by the treatment instrument wire 1 is small in the first strand 2 disposed on the neutral axis of the bending, and acts more conspicuously in the second strand 3 constituting the outer layer portion 4A.
However, since the second strand 3 is more easily plastically deformed than the first strand 2, in the twisted state, the second strand 3 is plastically deformed to some extent, and the first strand 2 and other adjacent second strands. It is in close contact with the wire 3. For this reason, when bending stress acts on the treatment instrument wire 1, the outer layer portion 4 </ b> A can be resisted by the plurality of second strands 3 having high integrity.
For this reason, durability with respect to a bending can be improved compared with the case where 4 A of outer layer parts are comprised with the strand which consists of a metal material with small fracture elongation.

  Table 3 below shows the configuration and evaluation results of the treatment instrument wire used in the experiment.

As for the structure of the wire used for evaluation, all are 1x7 wire and Z twist similarly to the wire 1 for treatment tools. The strand diameters are all 0.4 mm.
Examples 1 to 3 and Comparative Examples 1 to 6 differ only in the material of the core wire and the strands constituting the outer layer portion (hereinafter, outer layer portion strands). Each material was selected from the materials shown in Table 1 above.
Example 1 is an example of the treatment instrument wire 1, and the material of the first strand 2 is MG (Zr group), and the material of the second strand 3 is SUS304.
Example 2 is an example of the treatment instrument wire 1, and the material of the first strand 2 is MG (Fe base), and the material of the second strand 3 is SUS304.
Example 3 is an example of the treatment instrument wire 1, and the material of the first strand 2 is MG (Cu base), and the material of the second strand 3 is a Ni—Ti superelastic material.

Each of the wires of the comparative examples is a wire having a configuration in which the material of the core wire and the material of the outer layer portion strand are matched.
In Comparative Examples 1 to 6, the material of the metal wire is MG (Zr group), MG (Fe group), MG (Cu group), SUS304, Ni-Ti superelastic material, Ni-Ti annealed material, respectively. .
Therefore, Comparative Examples 1 to 3 are composed only of materials that are less likely to be plastically deformed with a breaking elongation of 5% or less, and Comparative Examples 4 to 6 are composed of only materials that are easily plastically deformed with a breaking elongation of 20% or more. Yes.

Each of the wires of Examples 1 to 3 and Comparative Examples 1 to 7 is subjected to a bending test using the bending tester 104 shown in FIG. 3, and durability (bending durability) and elongation with respect to bending at a small bending radius are obtained. Evaluated.
The bending test machine 104 is a device that applies a load load by the weight 105 to the test wire W wound around the pulling unit 107 and gives repeated bending.
For this reason, one end of the test wire W is connected to the weight 105, and the weight 105 is suspended by hanging the test wire W around the pulley 106 having a diameter D halfway. The other end of the test wire W is extended vertically downward and is held by a holding portion 107a of the pulling portion 107 so as to be vertically movable.
The test conditions were as follows: the pulley diameter D of the pulley 106 was D = 15 (mm), the mass of the weight 105 was 5 kg, and the holding portion 107a was repeatedly reciprocated at a stroke of 100 mm at a frequency of 60 reciprocations / minute.
Thereby, the range of 100 mm of the test wire W is repeatedly bent from the straight state between the curvature radius of the pulley 106 of 7.5 mm. In addition, the tensile force of the test wire W is repeatedly changed which repeatedly changes around the offset load 49N by the weight 105.

The evaluation of the bending durability was made based on whether or not 100,000 reciprocations were possible without breaking. Here, the determination of “break” is determined as “break” when even one strand breaks. In Table 2, “O” means that 100,000 reciprocations were achieved without breaking, and “X” means that the fracture occurred less than 100,000 times.
Elongation was evaluated by the amount of elongation after the end of the bending test. Specifically, on the basis of an empirical value that the operability of the treatment tool such as a snare or a basket forceps deteriorates, the magnitude of the elongation amount is less than 10%, and 10% or more is ×. Those in which breakage occurred in the bending test were measured in the state at the time of breakage.

As shown in Table 3, in each of Examples 1 to 3, an evaluation of “◯” was obtained for both bending durability and elongation. Therefore, it can be seen that by repeating the operation of the treatment tool and the treatment operation, even when subjected to repeated bending and tension, it is difficult to cause elongation and good bending durability can be obtained.
On the other hand, in Comparative Examples 1 to 3, since all the metal strands are made of metal glass, it is difficult for elongation to occur, but the outer layer strands are difficult to be plastically deformed and lack in unity. However, it is inferior compared with Examples 1-3.
In Comparative Examples 4 to 6, since all the metal strands are made of a crystalline metal material, plastic deformation is easy and bending durability is good, but it is easy to plastic deformation. It is inferior to Examples 1-3.

  Thus, according to the wire 1 for treatment tools, the 1st strand 2 and the 2nd strand 3 are twisted together, the 1st strand 2 whose elongation at break is small compared with the 2nd strand 3 is made into a core wire, Since the outer layer portion 4A is constituted by the second strand 3 having a larger elongation at break than the first strand 2, even if the operation or treatment operation of the treatment instrument on which bending stress, tensile force, or compression force acts is repeated Elongation due to plastic deformation is less likely to occur. Further, the durability against bending can be improved as compared with the case where all the metal wires are made of a metal material having a small elongation at break.

  Further, according to the treatment instrument wire 1, since the outer periphery of the first strand 2 is covered by the second strand 3, the first strand 2 is broken in a bent state during the operation of the treatment instrument. Even if it did, the 1st strand 2 is covered with the 2nd strand 3 which is excellent in durability with respect to bending. For this reason, it has a structure in which the broken tip of the first strand 2 penetrates the second strand 3 and hardly protrudes to the side. Therefore, even if the first strand 2 is broken inside the sheath 41 or in the body cavity, the end portion of the first strand 2 is hardly exposed to the body cavity or the like.

  Further, the first strand 2 serving as the core wire is resistant to plastic deformation because it is difficult to be plastically deformed.

Moreover, according to the snare 40 of this embodiment, since the snare wire 43 and the operation wire 42 using the wire 1 for treatment tools are provided, durability as a treatment tool can be improved.
For example, the operation torque followability is less likely to decrease due to the wire elongation of the operation wire 42. Further, even when the snare wire 43 is repeatedly accommodated in the sheath 41, plastic deformation hardly occurs, so that the deterioration of the opening shape of the snare wire 43 is less likely to occur. For this reason, it is possible to provide a snare with good operability and excellent repeated use.

[First Modification]
Next, the wire for treatment tools of the 1st modification of this embodiment is demonstrated.
FIG. 4 is a schematic cross-sectional view showing a configuration of a treatment instrument wire according to a first modification of the first embodiment of the present invention.

Treatment instrument wire 10 of this modification, as shown in FIG. 4, the use of a treatment instrument wire 1 of the first embodiment as a single strand S _1, the strand S ₁ 3-ply together constituting 3x7 wire. The treatment instrument wire 10 can be used as the snare wire 43 and the operation wire 42 in place of the treatment instrument wire 1 of the first embodiment (the same applies to the following second to twenty-first modifications). ).
Hereinafter, a description will be given centering on differences from the first embodiment.
The strand S ₁ constitutes a second strand covered strand in which an outer peripheral surface is formed by the second strand 3. Therefore, the outer peripheral surface of the treatment instrument wire 10 is formed by the outer layer portion 4 </ b> A of each strand S ₁ , that is, the second strand 3.
Further, the method of twisting the treatment instrument wire 10 may be Z-twisted or S-twisted. The wire diameters of the first strand 2 and the second strand 3 can be appropriately selected according to the load received during use.

According to the treatment instrument wire 10, each strand S ₁ has the same configuration as the treatment instrument wire 1 of the first embodiment. Therefore, like the treatment instrument wire 1, the strand S ₁ is hardly stretched and bent. Excellent durability.
Further, since the three strands S ₁ that are resistant to elongation are twisted together, the strand S ₁ can be used for an operation application in which a higher load acts than the wire for treatment instrument 1 of the first embodiment.
Further, by three strands S ₁ is being twisted, the respective outer layer portion 4A abuts in close contact with the other outer layer portion 4A of the strands S _1, it is possible to further improve the resistance to flexion.

Further, since the strand S ₁ includes the first strand 2 and has a high breaking stress as a whole, even when the treatment instrument wire 10 is twisted, the strand S ₁ is resistant to a compressive force or a tensile force due to the twist within a range of almost elastic deformation. can do. For this reason, the wire 10 for treatment tools is also strong against a twist.

[Second Modification]
Next, a treatment instrument wire according to a second modification of the present embodiment will be described.
Fig.5 (a) is a typical front view which shows the structure of the wire for treatment tools which concerns on the 2nd modification of the 1st Embodiment of this invention. FIG.5 (b) is BB sectional drawing in Fig.5 (a).

Treatment instrument wire 11 of this modification, FIG. 5 (a), the (b), the use of a treatment instrument wire 1 of the first embodiment as a single strand S _1, the strand S ₁ Is a 7 × 7 wire constructed by twisting seven wires.
Hereinafter, differences from the first embodiment and the first modification will be mainly described.

The central portion of the treatment instrument wire 11, the strands S ₁ of one constituting the core strand of the wire body is arranged, the strands S ₁ the outer circumference of the six composing the outer layer strands of the strand S ₁ is Twisted.
The outer peripheral surface of the treatment instrument wire 11 is formed by the outer layer portion 4 </ b> A of each strand S ₁ constituting the outer layer strand, that is, the second strand 3.
Further, the method of twisting the treatment instrument wire 11 may be Z-twisted or S-twisted.
FIG. 5A shows a preferable example in which the core strand is Z-twisted, the outer layer strand is S-twisted, and the wire body is Z-twisted. According to such a twisting method, since the twisting direction of the core part strand and the outer layer part strand covering the outer periphery of the core part strand is opposite, it is difficult to unwind and the durability is further improved.
The wire diameters of the first strand 2 and the second strand 3 can be appropriately selected according to the load received during use.

According to the treatment instrument wire 11, since the plurality of strands S ₁ are twisted together like the treatment instrument wire 10 of the first modified example, the treatment instrument wire 11 hardly stretches and has excellent durability against bending. Further, since the number of strands S ₁ is larger than that of the treatment instrument wire 10, the strand S ₁ can have higher strength and higher durability than the treatment instrument wire 10.

[Third Modification]
Next, the wire for treatment tools of the 3rd modification of this embodiment is demonstrated.
Fig.6 (a) is typical sectional drawing which shows the structure of the wire for treatment tools which concerns on the 3rd modification of the 1st Embodiment of this invention.

  As illustrated in FIG. 6A, the treatment instrument wire 12 of the present modification includes an outer layer portion 4 </ b> B instead of the outer layer portion 4 </ b> A of the treatment instrument wire 1 of the first embodiment. Hereinafter, a description will be given centering on differences from the first embodiment.

The outer layer portion 4B has a total of three first strands 2 and a total of three second strands 3 along the circumferential direction on the outer periphery of the first strand 2 that is the core of the treatment instrument wire 12. Are alternately arranged one by one and twisted together. For this reason, the treatment instrument wire 12 is a 1 × 7 wire in which the first strand 2 is exposed at a part of the outer peripheral surface.
The method of twisting the treatment instrument wire 12 is not particularly limited, as with the treatment instrument wire 1 of the first embodiment.

According to the treatment instrument wire 12, since the first strand 2 is also included in the outer layer portion 4B, resistance to elongation becomes stronger, compared to the treatment instrument wire 1 of the first embodiment, Further, the elongation can be reduced.
Moreover, in the outer layer part 4B, the 1st strand 2 is twisted in the state pinched | interposed into the 2nd strand 3 which is easy to carry out plastic deformation. For this reason, since the 1st strand 2 is pinched | interposed into the 2nd strand 3 from the circumferential direction both sides of the wire main body, the position of the circumferential direction is restrained by the 2nd strand 3. FIG. As a result, the durability against bending can be improved as compared with the case where the outer layer portion is composed of only the first strand 2.

  Moreover, since the treatment instrument wire 12 includes the core wire and the first strand 2 that is difficult to be plastically deformed in the outer layer portion 4B, the treatment instrument wire 12 is more resistant to twisting than the treatment instrument wire 1 of the first embodiment. ing.

[Fourth and fifth modifications]
Next, treatment instrument wires according to fourth and fifth modifications of the present embodiment will be described.
FIGS. 6B and 6C are schematic cross-sectional views showing the configurations of the treatment instrument wires according to the fourth and fifth modifications of the first embodiment of the present invention, respectively.

Treatment instrument wire 13 of the fourth modification, as shown in FIG. 6 (b), instead of three strands S ₁ of the first modification treatment instrument wire 10 of the above third modification This is a 3 × 7 wire including three strands S ₂ having the same configuration as the treatment instrument wire 12.
Further, the treatment instrument wire 14 of the fifth modification, as shown in FIG. 6 (c), in place of 7 strands S ₁ of the treatment instrument wire 11 of the second modified example, 7 strands is a 7 × 7 wires with a S _2.

According to the treatment instrument wire 13, since each strand S ₂ has the same structure as the treatment instrument wire 12 of the third modification, similarly to the treatment instrument wire 12, hardly occurs elongation, and Excellent durability against bending.
Moreover, since the twisted three or seven strong strand S ₂ in elongation, the high load as compared with the treatment instrument wire 12 of the third modification can be used for operating applications that act.
Further, by twisting three or seven strands S ₂ , the first strand 2 comes into contact with the second strand 3 even inside the treatment instrument wires 13 and 14, respectively. The 1st strand 2 is restrained by the 2nd strand 3, and the resistance with respect to bending can be improved more.

[Sixth Modification]
Next, a treatment instrument wire according to a sixth modification of the present embodiment will be described.
Fig.7 (a) is typical sectional drawing which shows the structure of the wire for treatment tools which concerns on the 6th modification of the 1st Embodiment of this invention.

  As shown in FIG. 7A, the treatment instrument wire 15 of the present modification is obtained by twisting twelve second strands 3 around the outer periphery of the treatment instrument wire 1 of the first embodiment. A 1 × 19 wire having a similar cross-sectional configuration. That is, an intermediate layer portion 5A composed of six second strands 3 is formed on the outer periphery of the first strand 2 that is a core wire, and an outer layer portion 4C composed of twelve second strands 3 is formed on the outer periphery thereof. ing. For this reason, the outer peripheral surface of the treatment instrument wire 15 is configured only by the second strand 3. Hereinafter, a description will be given centering on differences from the first embodiment.

  The twisting direction of the intermediate layer part 5A and the outer layer part 4C can be an appropriate twisting direction, but in order to make the twisting more difficult, the twisting direction of the intermediate layer part 5A and the twisting direction of the outer layer part 4C are opposite to each other. The direction is preferred.

The treatment instrument wire 15 has a two-layer structure in which an intermediate layer portion 5A and an outer layer portion 4C made of only the second strand 3 are formed on the outer periphery of the first strand 2, and thus the first embodiment. Compared with the treatment instrument wire 1, the adhesion between the second strands 3 is improved. Moreover, since bending stress can be loaded with more 2nd strand 3, the durability with respect to bending can be improved.
In addition, according to the treatment instrument wire 15, since the outer periphery of the first strand 2 is double-covered by the second strand 3, the first strand 2 should not be damaged during the operation of the endoscope. Even when it is broken in a bent state, the broken tip of the first strand 2 is less prone to protrude than the treatment instrument wire 1.

[Seventh Modification]
Next, a treatment instrument wire according to a seventh modification of the present embodiment will be described.
FIG.7 (b) is typical sectional drawing which shows the structure of the wire for treatment tools which concerns on the 7th modification of the 1st Embodiment of this invention.

As shown in FIG. 7B, the treatment instrument wire 16 of the present modification is the same as the twelve second strands 3 twisted around the outer periphery of the treatment instrument wire 12 of the third modification. 1 × 19 wire having the following cross-sectional configuration. That is, a total of six intermediate layer portions 5B in which the treatment instrument wires 1 and the second strands 3 are alternately arranged are formed on the outer periphery of the first strand 2 that is the core wire, and the outer layer portion 4C is formed on the outer periphery thereof. Is formed. For this reason, the outer peripheral surface of the treatment instrument wire 16 is constituted only by the second strand 3.
This modified example is also configured to include an intermediate layer portion 5B instead of the intermediate layer portion 5A of the sixth modified example. The following description will focus on differences from the third and sixth modifications.

  The twisting direction of the intermediate layer part 5B and the outer layer part 4C can be an appropriate twisting direction, but in order to make the twisting more difficult, the twisting direction of the intermediate layer part 5A and the twisting direction of the outer layer part 4C are opposite to each other. The direction is preferred.

  According to the treatment tool wire 16, the first strand 2 constituting a part of the intermediate layer portion 5 </ b> B is covered by the second strand 3 not only in the circumferential direction but also from the outside in the radial direction. For this reason, since the restraint with respect to the 1st strand 2 is strengthened compared with the wire 12 for treatment tools of the said 3rd modification, durability with respect to bending can be improved more.

[8th to 10th modifications]
Next, the wire for treatment tools of the 8th-10th modification of this embodiment is demonstrated.
8A, 8B, and 8C are schematic cross-sectional views illustrating the configuration of the treatment instrument wire according to the eighth to tenth modified examples of the first embodiment of the present invention.
Each of the eighth to tenth modification examples is an example in which a 7 × 7 wire in which the outer peripheral surface of the wire body is formed only from the second strand 3 is formed by twisting together the seven strands. Yes.

As illustrated in FIG. 8A, the treatment instrument wire 17 of the eighth modification is replaced with a strand S ₂ instead of the strand S ₁ which is the core strand of the treatment instrument wire 11 of the second modification. Prepare.
According to the treatment instrument wire 17, since the strand S ₂ which is less likely to be stretched is adopted as the core strand, the stretch is less likely to occur compared to the treatment instrument wire 11.

Treatment instrument wire 18 of the ninth modification, as shown in FIG. 8 (b), instead of the outer layer portion 6 strands S ₁ is a strand of the treatment instrument wire 11 of the second modification, 6 equipped with a strand _{S 5} of this.
The strand S ₅ is obtained by replacing the first strand 2, which is the strand core wire of the strand S ₁ , with the second strand 3. For this reason, the strand S ₅ is a strand composed of only the seven second strands 3.
According to the treatment instrument wire 18, since the strand S ₅ which is more excellent in bending durability is adopted as the outer layer strand, the durability against bending can be improved as compared with the treatment instrument wire 11.
Moreover, since the 1st strand 2 is enclosed in multiple by the 2nd strand 3, the possibility that it may protrude to the side at the time of a fracture | rupture further decreases.

Treatment instrument wire 19 of the tenth modification, as shown in FIG. 8 (c), instead of the outer layer portion 6 strands S ₁ is a strand of the eighth modification of the treatment instrument wire 17, 6 equipped with a strand _{S 5} of this.
According to the treatment instrument wire 19, the strand S _2, which does not easily stretch in the core strand, is used, and the strand S _5, which has excellent bending durability, is used in the outer layer strand. It is easy to achieve both improvement in performance.
The first wire 2 is disposed only core strands, because it is surrounded by the strand S ₁ constituting the outer layer strands, as compared with the treatment instrument wire 17, can be laterally protruding at break Can be further reduced.

[Eleventh and twelfth modifications]
Next, treatment instrument wires according to eleventh and twelfth modifications of the present embodiment will be described.
FIGS. 9A and 9B are schematic cross-sectional views showing the configuration of the treatment instrument wire according to the eleventh and twelfth modifications of the first embodiment of the present invention.
In the eleventh and twelfth modified examples, the core strand composed of only the first strand 2 and the outer layer strand composed of only the second strand 3 are twisted together so that the outer peripheral surface of the wire body is the second strand. This is an example in the case where a wire formed only from the wire 3 is configured.

As shown in FIG. 9A, the treatment instrument wire 20 of the eleventh modified example has three strands S _{6 formed} by twisting three first strands 2 as core strands, and three second wires on the outer periphery thereof. This is a 7 × 3 wire formed by twisting six strands S ₇ obtained by twisting strands 3. The strand S ₇ is an outer layer strand constituting the outer peripheral surface of the wire body of the treatment instrument wire 20.
Further, the strand S ₆ constitutes a first strand strand that is a strand composed only of the first strand 2.
The twist direction of the treatment instrument wire 20 is not particularly limited. For example, a configuration in which the strand S ₆ is Z-twisted, the strand S ₇ is S-twisted, and the wire body is Z-twisted can be adopted.
According to the treatment instrument wire 20, the strand S ₆ composed only of the first strand 2 that hardly causes elongation in the core portion strand is adopted, and the outer layer portion strand is composed only of the second strand 3 excellent in bending durability. since it uses the strand S ₇ made, and the improvement of suppression and bending durability of the elongation becomes easily compatible.

Treatment instrument wire 21 of the 12 modification, as shown in FIG. 9 (b), in place of the strand S ₂ is a core strand of the treatment instrument wire 19 of the tenth modification, the strand S ₈ Prepare.
Strand S _8, all the second element wires 3 of the outer layer portion 4B of the strand S ₂ is obtained instead of the first wire 2. For this reason, the strand S ₈ constitutes a first strand strand composed of only seven first strands 2.
According to the treatment instrument wire 21, the strand S ₈ composed only of the first strand 2 that hardly causes elongation in the core portion strand is adopted, and the outer strand portion strand is composed only of the second strand 3 excellent in bending durability. since it uses the strand S ₅ made, and the improvement of suppression and bending durability of the elongation becomes easily compatible.

[Thirteenth Modification]
Next, a treatment instrument wire according to a thirteenth modification of the present embodiment will be described.
FIG. 10: is typical sectional drawing which shows the structure of the wire for treatment tools which concerns on the 13th modification of the 1st Embodiment of this invention.

As shown in FIG. 10, the treatment instrument wire 22 of the present modification is broken more than the second strand 3 in place of the strand S ₂ that is the core strand of the treatment instrument wire 17 of the eighth modification. elongation is a small metallic material, comprising a first strand 2a formed in a diameter larger than that of the first wire 2 strands S _1. Wire diameter of the first wire 2a is not particularly limited as long as the wire diameter that can be twisted strands S ₁ of six to cover in close contact with the outer periphery of the first wire 2a.
The material of the first strand 2a may be the same as or different from the first strand 2.
According to the treatment instrument wire 22, since the first strand 2 a which is a single wire that hardly stretches in the wire core wire is employed, the configuration is simpler than the treatment instrument wire 17 of the eighth modified example. Thus, it can be manufactured at low cost.
In addition, since the single first wire 2a is used instead of the stranded wire composed of only the first strand 2 that is difficult to be twisted because it is difficult to be plastically deformed, the manufacturing is facilitated.

[Fourteenth to Sixteenth Modifications]
Next, the treatment instrument wires of the fourteenth to sixteenth modifications of the present embodiment will be described.
11 (a), (b), and (c) are schematic cross-sectional views showing the configuration of the treatment instrument wire according to the fourteenth to sixteenth modifications of the first embodiment of the present invention. .
The fourteenth to sixteenth modified examples are further metal in the configuration of the 1 × 7 wire, the 3 × 7 wire, and the 7 × 7 wire among the wire for the treatment instrument described in the first embodiment and each modified example. It is the modification which changed the wire diameter of the strand. However, since it is difficult to understand in the drawing, it may indicate that the diameter is changed by changing only the type of cross-sectional hatching.

The treatment instrument wire 23 according to the fourteenth modification is a modification applicable to a 1 × 7 wire. For example, the treatment instrument wire 1 according to the first embodiment and the treatment instrument wire according to the third modification. 12 is applicable.
As shown in FIG. 11 (a), the treatment instrument wire 23 has a wire diameter of a large-diameter strand 8 which is a wire core wire arranged in the center portion among seven metal strands of 1 × 7 wire. The diameter of the large-diameter strand 8 is larger than the diameter of the small-diameter strand 9 that is the six metal strands that are twisted around the outer periphery of the large-diameter strand 8 to form the outer layer portion. That is, when the wire diameters of the large-diameter strand 8 and the small-diameter strand 9 are expressed as d ₈ and d ₉ , respectively, d ₈ > d ₉ is satisfied.
That is, when applied to the treatment instrument wire 1, the wire diameter of the first wire 2 and d _8, the wire diameter of the second wire 3 constituting the outer layer portion 4A and d _9.
Also, when applied to the treatment instrument wire 12, the first diameter of the wire 2 constituting the core and d _8, the wire diameter of the first wire 2 and the second wire 3 constituting the outer layer portion 4B and d _9.
Thus, the large-diameter strand 8 and the small-diameter strand 9 represent only the difference in wire diameter, and the material of each metal strand conforms to the configuration of the modified example to be applied (the same applies to the following modified examples).

  According to the treatment instrument wire 23, the wire diameter of the outer layer portion is smaller than the wire diameter of the core wire, so that the diameter of the wire body can be reduced compared to the case where the wire diameter is the same, and the outer layer portion. Since the resistance to bending by the metal wire constituting the wire is reduced, the wire becomes more supple and the bending durability can be improved. Moreover, it becomes a wire which is hard to extend for the outer diameter of a wire main body because the wire diameter of a core wire becomes comparatively large.

The treatment instrument wire 24 according to the fifteenth modification is a modification applicable to a 3 × 7 wire. For example, the treatment instrument wire 10 according to the first modification, and the treatment instrument wire 13 according to the fourth modification. Is applicable.
Treatment instrument wire 24, as shown in FIG. 11 (b), the first 14 of the procedure instrument wire 23 modification as one strand S _t1, 3 × constructed by twisting the strands S _t1 3 present 7 wires.

The treatment instrument wire 25 according to the sixteenth modification is a modification applicable to a 7 × 7 wire. For example, the treatment instrument wire 11 according to the second modification and the treatment instrument wire 14 according to the fifth modification. The treatment instrument wires 17 to 19 of the eighth to tenth modification examples and the treatment instrument wire 21 of the twelfth modification example can be applied.
Treatment instrument wire 25, as shown in FIG. 11 (c), the fourteenth a treatment instrument wire 23 modification as one strand S _t1, 7 × constructed by twisting the strands S _t1 7 present 7 wires.
However, distribution of the first wire 2 and the second wire 3 in the strand S _t1 are according to the configuration of the modification to apply. Therefore, even if it is described as the strand _St1 , the structure of each material may be different between the core strand and the outer layer strand, for example.

[17th and 18th modifications]
Next, the wire for treatment instruments of the 17th and 18th modification of this embodiment is explained.
12A and 12B are schematic cross-sectional views showing the configuration of the treatment instrument wire according to the seventeenth and eighteenth modifications of the first embodiment of the present invention, respectively.
The seventeenth and eighteenth modified examples are modified examples in which the wire diameter of the metal strand is further changed in the configuration of the 7 × 3 wire and the 7 × 7 wire, respectively, among the wires for the treatment instrument described in the above modified examples. is there.

The treatment instrument wire 26 of the seventeenth modification is a modification applicable to a 7 × 3 wire, and can be applied to the treatment instrument wire 20 of the eleventh modification, for example.
Treatment instrument wire 26, as shown in FIG. 12 (a), all the metal filaments of the strand S ₆ of the treatment instrument wire 20 into a strand S _t2 constituted a large径素line 8, the wire treatment instrument all the metal filaments of the strand S ₇ of 20 is obtained by a strand S _t3 constituted by a small diameter wire 9.

The treatment instrument wire 27 according to the eighteenth modification is a modification applicable to a 7 × 7 wire. For example, the treatment instrument wire 11 according to the second modification, and the treatment instrument wire according to the fifth modification. The present invention can be applied to the wire 14, the treatment instrument wires 17 to 19 of the eighth to tenth modification examples, and the treatment instrument wire 21 of the twelfth modification example.
Treatment instrument wire 27, as shown in FIG. 12 (b), all the core strand and the strand S _t4 consisting large径素line 8, 7 strands S which all the outer layer strands formed of a small diameter wire 9 7 × 7 wire configured as _t5 .
However, the distribution of the first strand 2 and the second strand 3 in the strand _St4 and each strand _St5 conforms to the configuration of the applied modification.

  According to the treatment instrument wires 26 and 27, the core strand is composed of a plurality of large-diameter strands 8 and the outer layer strand is composed of a plurality of small-diameter strands 9, so that the wire diameter is the same. Thus, the diameter of the wire body can be reduced, and the outer diameter of the core strand becomes relatively large, so that the wire is less likely to extend relative to the outer diameter of the wire body.

[19th modification]
Next, a treatment instrument wire according to a nineteenth modification of the embodiment will be described.
FIG. 13: is typical sectional drawing which shows the structure of the wire for treatment tools which concerns on the 19th modification of the 1st Embodiment of this invention.
The nineteenth modified example is another modified example in which the wire diameter of the metal strand is further changed in the configuration of the 7 × 7 wire among the treatment instrument wires described in the above modified examples.

The treatment instrument wire 28 according to the nineteenth modification is, for example, the treatment instrument wire 11 according to the second modification, the treatment instrument wire 14 according to the fifth modification, and the treatment instrument wires according to the eighth to tenth modifications. It can be applied to the wires 17 to 19 and the treatment instrument wire 21 of the twelfth modification.
Treatment instrument wire 28, as shown in FIG. 1 3, comprising a strand S _t6 as core strands, a 7 × 7 wires having a strand S _t7 of seven as the outer layer portion strands.
Strand S _t6, the strand core (core strand wire) is comprised of the first large径素line 8a having a wire diameter d _8a, the outer periphery of the first large径素line 8a, the first large径素line than the wire diameter of 8a in which the second large径素line 8b having a small diameter wire diameter d _8b are arranged six twisted with.
Strand S _t7, the strand core (outer layer strands wire) is comprised of a first small diameter wire 9a having the wire diameter d _9a second large径素line 8b, the outer periphery of the first small-diameter wire 9a , in which the second small-diameter wire 9 b having a small diameter wire diameter d _9b than the wire diameter of the first small-diameter wire 9a is disposed six twisted with.
That is, the wire diameter of the metal strand of this modification satisfies the relationship d _9b <d _9a ≦ d _8b <d _8a .
However, the distribution of the first strand 2 and the second strand 3 in the strand _St6 and each strand _St7 is in accordance with the configuration of the modified example to be applied.

As described above, in the treatment instrument wire 28, the wire diameter of the metal wire constituting the outer layer portion is smaller than the wire diameter of the strand core wire, as in the sixteenth modification. Further, similarly to the eighteenth modified example, the wire diameter of the metal strand constituting the core portion strand does not exceed the wire diameter of the metal strand constituting the outer layer strand.
For this reason, it is possible to reduce the diameter of the wire body and to improve the bending durability while relatively suppressing the occurrence of elongation.

[20th and 21st modifications]
Next, treatment instrument wires according to twentieth and twenty-first modifications of the present embodiment will be described.
14 (a) and 14 (b) are schematic cross-sectional views illustrating the configuration of the treatment instrument wire according to the twentieth and twenty-first modifications of the first embodiment of the present invention.

  Each of the twentieth and twenty-first modifications is a modification in which the outer peripheral surface of the treatment instrument wire described in the first embodiment and each modification is covered with a covering material.

As shown in FIG. 14A, the treatment instrument wire 1 </ b> A according to the twentieth modification includes a first strand 2 that is a core wire and an outer layer portion 4 </ b> A that includes six second strands 3. The outer peripheral surface of the treatment instrument wire 1 is coated with a coating material 30 made of a resin material.
As a material of the covering material 30, a resin material that can obtain good sliding characteristics, such as a fluororesin, can be suitably used for a member that the treatment instrument wire 1A contacts in the endoscope.
As shown in FIG. 14B, the treatment instrument wire 1 </ b> B of the twenty-first modification is obtained by coating the outer peripheral surface of the treatment instrument wire 1 with a coating material 31 made of a solid lubricant material.
As a material of the covering material 31, for example, molybdenum disulfide (MoS ₂ ) can be preferably used.

In the treatment instrument wires 1 </ b> A and 1 </ b> B, the outer peripheral surface of the treatment instrument wire 1 is protected by the covering materials 30 and 31, respectively, and can slide well with respect to a member that contacts the sheath 41 of the treatment instrument. . For this reason, durability of wire 1A, 1B for treatment tools can be improved.
Moreover, since the covering materials 30 and 31 are less rigid than the first strand 2 and the second strand 3, they do not hinder the deformation of the treatment instrument wire 1. Accordingly, the durability of the treatment instrument wires 1 </ b> A and 1 </ b> B with respect to elongation and bending is equivalent to that of the treatment instrument wire 1.
Moreover, these wire 1A, 1B for treatment tools can each be used as a strand.
These treatment instrument wires 1A and 1B are suitable for the operation wire 42 of the first embodiment, for example, when the covering materials 30 and 31 have lubricity.
Moreover, the coating materials 30 and 31 may be simply a coating for protecting the wire surface, and in this case, a material having no lubricity may be employed.
Further, when the covering materials 30 and 31 are electrically insulating, they are unsuitable for the snare wire 43 of the first embodiment, but if they are treatment portions that do not require conductivity, they are used as treatment portion wires. Can do.

[Second Embodiment]
A treatment tool according to a second embodiment of the present invention will be described.
FIG. 15 is a schematic cross-sectional view showing a schematic configuration of a treatment tool according to the second embodiment of the present invention. FIG. 16: is a perspective view which shows the structure of the wire for treatment tools which concerns on the 2nd Embodiment of this invention.

The basket forceps 50 that is a treatment tool of the present embodiment is a medical instrument that captures, collects, and crushes, for example, a calculus, and passes through a treatment tool channel of an endoscope inserted into a body cavity. It can be inserted into a treatment part in a body cavity.
As shown in FIG. 15, the schematic configuration of the basket forceps 50 includes a flexible sheath 54 that can be inserted into a treatment instrument channel of an endoscope (not shown), and an operation that is inserted into the flexible sheath 54 so as to be able to advance and retract. A basket portion 52 (treatment) which is joined to the wire 53 and the distal end of the operation wire 53 and which can move forward and backward in the axial direction of the flexible sheath 54 inside a hard portion 55 provided at one end of the flexible sheath 54. Part) and a base part 56 through which a rod-like coupling member 57 joined to the other end of the flexible sheath 54 and joined to the rear end part of the operation wire 53 is movably inserted.

As the configuration of the flexible sheath 54, for example, a metal close-wound coil in which a liquid-tight tube is provided on the inner peripheral surface, a flexible resin sheath, or the like can be employed.
The configuration of the operation wire 53 may employ, for example, a stranded wire made of stainless steel wire, but in the present embodiment, the treatment instrument wire 1 of the first embodiment is employed.
However, in this embodiment, the material of the 1st strand 2 in the wire 1 for treatment tools has employ | adopted the Volfa (trademark) which is a metal glass of Fe base alloy as an example. Moreover, the material of the 2nd strand 3 has employ | adopted the Ni-Ti super elastic material.

The base part 56 is inserted through the other end part of the flexible sheath 54 into one end part of the base body 56e having a guide hole 56c provided penetrating through the center part for guiding the advancement and retraction of the coupling member 57. A cover 58 that protects the other end of the flexible sheath 54 and a sheath joint 56 d that joins the other end of the flexible sheath 54 within the cover 58 are provided.
The other end of the base body 56e is provided with a connecting portion 56a for connecting to an operating portion (not shown) for operating the basket forceps 50 by moving the operating wire 53 back and forth.
In addition, a liquid supply port portion 56b for supplying a liquid such as a contrast medium is provided in the middle portion of the base body 56e by connecting a syringe (not shown) or the like from the side.

The basket portion 52 is for holding or crushing an object to be treated such as a calculus, for example, and constitutes a treatment portion of the basket forceps 50.
As shown in FIG. 16, the basket portion 52 of the present embodiment includes basket wires 52A, 52B, 52C, and 52D (treatment portion wires) having the same shape bent into a mountain-shaped broken line by bent portions 52i and 52j, respectively. These are integrally joined at the front end joint portion 52a and the base end joint portion 52b at both end portions on the hem side of the mountain shape. (Hereinafter, when there is no possibility of misunderstanding, “basket wires 52A, 52B, 52C, 52D” may be collectively referred to as “basket wires 52A etc.”)
In the present embodiment, the basket wire 52A and the like employ the treatment instrument wire 1 having the same configuration as the operation wire 53.

  The tip joint portion 52a is formed by integrating one end portions of the basket wire 52A and the like into a cylindrical shape. In this embodiment, it integrates by soldering as an example. Further, the base end joint portion 52b is formed by integrating the other end portion of the basket wire 52A and the like on the outer peripheral side of the end portion of the operation wire 53 and integrating them into a columnar shape. In the present embodiment, they are integrated by soldering in the same manner as the tip joint portion 52a.

  The basket wires 52A and the like are arranged so as to be rotationally symmetric with respect to a central axis C connecting the center lines of the distal end joint portion 52a and the proximal end joint portion 52b. Therefore, the basket wires 52A and 52C are arranged in line symmetry with the central axis C as the symmetry axis on the same plane, and the basket wires 52B and 52D include the central axis C and the plane on which the basket wires 52A and 52C are arranged. They are arranged in line symmetry with the central axis C as the axis of symmetry on an orthogonal plane.

Thus, basket wire 52A, 52B, 52C, 52D comprises the bowl-shaped linear part centering on the central axis C, takes in a to-be-processed object from the clearance gap between each wire, and is basket-shaped. It is possible to store an object to be treated inside.
Further, the basket portion 52 is joined to the operation wire 53 at the proximal end joint portion 52 b, so that the operation wire 53 is advanced and retracted in the flexible sheath 54, so that the basket portion 52 can be moved forward and backward with respect to the hard portion 55. ing.

A method for manufacturing the basket portion 52 having such a configuration will be described.
FIG. 17: is a front view which shows the structure of a part of wire for treatment tools which concerns on the 2nd Embodiment of this invention. FIG. 18 is a perspective view for explaining a step of bending the treatment instrument wire according to the second embodiment of the present invention.

First, the treatment instrument wire 1 is cut according to the length of the basket wire 52A or the like. Then, the bending wire 60 is formed by bending into the shape shown in FIG.
The bending wire 60 includes a distal end portion 52c for forming the distal end joint portion 52a, elastic wire portions 52d, 52e, 52f for forming a mountain-shaped broken line shape, and a proximal end portion 52g for forming the proximal end joint portion 52b. Are bent at the bent portions 52h, 52i, 52j, and 52k in the same plane.
As shown in FIG. 17, the bending shape of the bending wire 60 is such that when the distal end portion 52 c is arranged in the illustrated horizontal direction, the elastic wire portion 52 d is extended obliquely upward from the bending portion 52 h formed at one end thereof, The elastic wire portion 52e extends in the horizontal direction in the figure from the bent portion 52i at the end opposite to the bent portion 52h of the elastic wire portion 52d, and the bent portion 52j at the end opposite to the bent portion 52i of the elastic wire portion 52e. The elastic wire part 52f is extended obliquely downward in the figure, and the base end part 52g is extended in the horizontal direction in the figure from the bent part 52k on the opposite side of the bent part 52j of the elastic wire part 52f. .
The proximal end portion 52g is disposed substantially parallel to the distal end portion 52c at a position shifted to the elastic wire portion 52e side by a distance d. Although the distance d may be 0, it is preferable to set the distance d to a size approximately equal to the radius of the operation wire 53.

When bending the treatment instrument wire 1 to form the bending wire 60, the first strand 2 made of metal glass is difficult to be plastically deformed, and therefore the cut treatment instrument wire 1 is at least bent portions 52h, 52i, 52j. , 52k may be press-molded with the temperature raised to the glass transition region.
For example, as shown in FIG. 18, the mold surfaces 70 c each having a groove portion 70 a having a semicircular cross section corresponding to the bent shape of the bending wire 60 in a plan view on the flat portion 70 b. Press molding is performed using the molds 70A and 70B.
Although not particularly illustrated, the molds 70A and 70B include a heater unit that raises the temperature of the mold surface 70c that forms the bent portions corresponding to at least the bent portions 52h, 52i, 52j, and 52k to the glass transition region. The molds 70A and 70B are supported by a pressurizing mechanism that positions the molds 70A and 70B so that the groove portions 70a face each other and advances and retracts in the facing direction.

First, in a state where the molds 70A and 70B are at a lower temperature than the glass transition region, the cut treatment instrument wire 1 is disposed along the groove 70a. At this time, although the treatment instrument wire 1 is not easily plastically deformed, it is elastically deformed, so that it can be easily placed in the groove 70a.
Next, the molds 70 </ b> A and 70 </ b> B are closed, and the treatment instrument wire 1 is heated to the glass transition region while being held in the groove 70 a. Thereby, the 1st strand 2 of the wire 1 for treatment tools deform | transforms along the shape of the groove part 70a.
Then, the molds 70A and 70B are cooled to a temperature lower than the glass transition point. As a result, the first strand 2 is solidified in an amorphous state, and the bending wire 60 is formed. Thereafter, as shown in FIG. 18, the molds 70A and 70B are opened, and the bending wire 60 is removed.

When the four bending wires 60 are formed, the four bonding wires and the operation wire 53 that has been cut separately are aligned by holding the bending wires 60 with an appropriate fixing jig, and the distal joint portions 52a and the proximal joint portions 52b. And the end of the operation wire 53 are respectively soldered to form a distal end joint 52a and a proximal end joint 52b.
In this way, the basket portion 52 is formed.

When the basket portion 52 is formed, the coupling member 57 is joined to the end portion of the operation wire 53 opposite to the side where the basket portion 52 is joined. Then, the coupling member 57 and the operation wire 53 are inserted into the tube of the flexible sheath 54. Next, in a state where the coupling member 57 is inserted into the guide hole 56c of the base part 56, the flexible sheath 54 and the base part 56 are joined by the sheath joint part 56d, and the cover 58 is attached.
In this way, the basket forceps 50 is manufactured.

Next, the operation of the basket forceps 50 will be described.
In the basket forceps 50, the connecting portion 56a of the base portion 56 is connected to an operation portion (not shown), and the distal end position of the connecting member 57 protruding from the base portion 56 by the operating portion is retracted close to the connecting portion 56a. It moves forward and backward between the position and the advance position away from the connecting portion 56a.
When the coupling member 57 is in the retracted position, as shown in FIG. 15, the basket portion 52 is in contact with the hard portion 55 on the base end joint portion 52b side, and the basket portion 52 is expanded in a bowl shape. . For this reason, for example, stones can be taken in from the gap between the basket wires 52A and the like.
Further, when the coupling member 57 is in the advanced position, the operation wire 53 in the flexible sheath 54 is pulled toward the base portion 56 side, and the proximal end joint portion 52b is pulled more toward the flexible sheath 54 side. Thereby, each elastic wire part 52f of the basket part 52 is drawn into the flexible sheath 54 along the inner diameter of the hard part 55, and the basket part 52 is contracted. For this reason, when the calculus etc. are taken in in the basket part 52, the taken in calculus can be hold | maintained or crushed according to the amount of contraction.
When the basket portion 52 is contracted, the basket wire 52A and the like of the basket portion 52 are stretched by a tensile stress, and the bent portions 52h, 52i, 52j, and 52k are also deformed so that the bent angles are further opened. However, it will be extended.
Further, when nothing is taken into the basket portion 52, the basket portion 52 is drawn into the flexible sheath 54 through the hard portion 55 so that it can be inserted through the treatment instrument channel of an endoscope (not shown). Become.

Such basket forceps 50 is inserted into the body cavity through the treatment instrument channel of the endoscope in a state where the basket portion 52 is accommodated in the distal end portion of the flexible sheath 54. Then, the basket member 52 is expanded by moving the coupling member 57 to the retracted position, a treatment target such as a calculus in the body cavity is taken in, and the crushing operation is performed by moving the coupling member 57 to the advanced position. be able to.
By repeating such a treatment, the basket wire 52A and the operation wire 53 of the basket forceps 50 and the operation wire 53 are repeatedly subjected to loads such as bending, pulling, and compression.
In this embodiment, since the treatment instrument wire 1 is employed for the basket wire 52A and the operation wire 53, even if such repeated load acts, for example, a conventional SUS wire or Ni-Ti alloy wire Since the elongation due to plastic deformation can be reduced as compared with a wire for a treatment instrument made of only wires, durability can be improved.

[Third Embodiment]
A treatment tool according to a third embodiment of the present invention will be described.
FIG. 19A is a schematic front view showing a configuration of a treatment instrument wire used in a treatment instrument according to a third embodiment of the present invention. FIG.19 (b) is DD sectional drawing in Fig.19 (a). Fig.20 (a) is typical sectional drawing which shows the cross section of the connection part of the wire for treatment tools and treatment part of the treatment tool which concerns on the 3rd Embodiment of this invention. FIG. 20B is a schematic cross-sectional view showing the manufacturing process of the connecting portion. FIGS. 21A, 21B, and 21C are schematic process explanatory views showing the joining process of the distal end joining portion of the treatment instrument according to the third embodiment of the present invention.

  As shown in FIGS. 15 and 16, a basket forceps 80 which is a treatment tool of the present embodiment is replaced with an operation wire 83 and a basket 52, respectively, instead of the operation wire 53 and the basket portion 52 of the basket forceps 50 of the second embodiment. A part 82 (treatment part) is provided. Hereinafter, a description will be given focusing on differences from the second embodiment.

As shown in FIGS. 19A and 19B, the operation wire 83 is the four first twisted wires instead of the first strand 2 in the treatment instrument wire 1 of the first embodiment. A 1 × 10 treatment instrument wire 32 including a strand 33 is employed. That is, the treatment instrument wire 32 is a stranded wire in which a core strand is formed by the four first strands 33 and the outer layer portion of the core strand is surrounded by the second strand 3 to form an outer peripheral surface. It has become.
In the present embodiment, the twist direction of the first strand 33 is the S strand opposite to the twist direction of the first strand 2.
The first strand 33 is a metal strand having a breaking elongation of 20% or more similar to that of the first embodiment, and the same material as that of the first strand 2 of the first embodiment may be adopted. it can. In the present embodiment, as an example, a metal glass having a composition of Zr ₅₅ Cu ₃₀ Al ₁₀ Ni ₅ is employed. The strand diameter of the second strand 33 is 0.13 mm.

The basket portion 82 is formed by the four first strands 33 of the treatment instrument wire 32 having a saddle shape similar to that of the basket portion 52 of the second embodiment.
In other words, corresponding to the basket wires 52A, 52B, 52C, 52D, basket wires 82A, 82B, 82C, 82D (treatment section wires) arranged in the same positional relationship are provided.
The basket wires 82 </ b> A and the like are formed by bending four single wires of the first strand 33 extending from the end of the treatment instrument wire 33. That is, the basket wire 82 </ b> A and the like constitute an extending portion that extends from the wire end portion of the first strand 33 constituting a part of the treatment instrument wire 33.
Like the basket wire 52A and the like, the shape of the basket wire 82A and the like is provided with a tip 52c and elastic wire portions 52d, 52e and 52f, and bent portions 52h, 52i and 52j between them. It is bent at. Further, as shown in FIG. 20A, the elastic wire portion 52 f is bent at a bent portion 52 k to form a linear portion 82 g aligned along the axial direction of the operation wire 83. In FIG. 20A, the linear portion 82g is drawn extending straight, but the four linear portions 82g may be twisted together.

  Further, the end portions of the basket wire 82A and the like are fixed by a proximal end joining portion 82b (caulking fixing portion) and a distal end joining portion 82a (caulking fixing portion) formed by hot pressing.

As shown in FIG. 20A, the base end joint portion 82b has a cylindrical shape in which the four linear portions 82g and the second strands 3 at the end portions of the operation wire 83 are covered and integrated from the outer peripheral side. Have.
In order to form the proximal end joining portion 82b, as shown in FIG. 20B, first, a caulking pipe 84 made of metal glass having a glass transition point equal to or lower than the glass transition point of the metal glass used for the second strand 3 is used. Is inserted through a range covering the four linear portions 82 g and the second strand 3 of the operation wire 83. Then, the caulking pipe 84 is hot-pressed using a mold heated to the temperature of the glass transition region of the metallic glass of the caulking pipe 84 by a pressing device (not shown), and the outer diameter is reduced by the mold. . As the pressing force, an appropriate pressing force that deforms the caulking pipe 84 at the time of heating can be adopted, but in order to obtain good adhesion strength, it is preferable to pressurize at a pressure of 10 MPa or more.
Since the metallic glass is easily deformed in the glass transition region, the pressurized caulking pipe 84 enters the gap between the linear portions 82g and the second strands 3 so that the linear portions 82g and the operation wires 83 It closely adheres to and integrates the uneven shape of the outer peripheral wire.
When the deformed caulking pipe 84 is removed from the mold and cooled to be solidified, a proximal end joint portion 82b is formed.

Thus, the proximal joint section 8 2b, in order to form with a caulking pipe 84 by the metal glass can be made, such as the basket wires 82A is formed in the same manner even if not the metallic glass. For example, even when the outer layer portion such as the basket wire 82A is formed of a strand covered with a metal strand that is not metal glass such as SUS304, it is formed in the same manner.
Further, if the same metal glass as that of the second caulking wire 3 is adopted as the material of the caulking pipe 84, the linear portion 82g and the caulking pipe 84 are integrated with the interface between them disappearing. . In this case, the proximal joint section 8 2b is to become the joint between the same material, for example, as compared with the bonding comprising a heterogeneous portion of the material due to soldering or welding, strength, and excellent in such as corrosion resistance A junction can be formed.

The tip joining portion 82a is obtained by joining the basket wire 82A and the like of the present embodiment made of metal glass and performing joining without using parts such as the caulking pipe 84 only by hot pressing. .
That is, the tip joint portion 82a of the present embodiment is formed by integrating the four tip portions 52c by hot pressing, as shown in FIGS. 21 (a), (b), and (c).

In order to join the tip portions 52c, as shown in FIG. 21A, the four tip portions 52c are arranged adjacent to each other, and the groove portions 85a for forming the tip portions 52c into a cylindrical shape are flat. Press molding is performed using molds 85A and 85B each having a mold surface 85c formed on the portion 85b.
Although not particularly illustrated, the molds 85A and 85B include a heater unit for raising the temperature of the mold surface 85c to the glass transition region. Further, the molds 85A and 85B are positioned so that the grooves 85a face each other and move forward and backward in the facing direction, and pressurizing and releasing the molds 85A and 85B against the molding object. Supported by the mechanism.
This pressurizing mechanism can press the molds 85A and 85B with a pressure of 10 MPa or more.

In the joining process of the tip portion 52c by the molds 85A and 85B, as shown in FIG. 21A, first, the groove portions 85a face each other with the four tip portions 52c arranged adjacent to each other, and each groove portion 85a has four. The molds 85A and 85B are arranged at positions spaced from the two tip portions 52c. Then, the molds 85A and 85B are heated to the glass transition region by a heater unit (not shown). In this embodiment, the temperature is raised to 450 ° C.
Next, the pressurization mechanism (not shown) stops the molds 85A and 85B close to each groove 85a until it comes into contact with the tip 52c, and waits until the temperature of each tip 52c exceeds the glass transition temperature.

Each tip 52c heated to the glass transition region can be easily deformed at a pressure lower than 10 MPa, but in this embodiment, the tip 52c is pressed at 10 MPa or more, for example, 20 MPa, and each tip 52c is pressed into each groove 52c. The shape of 85a is transferred.
At this time, in this embodiment, since the molds 85A and 85B are pressurized with a pressure of 10 MPa or more, adhesion and fusion at the interface between the tip portions 52c are promoted, and compared with a case of pressing with a pressure of less than 10 MPa. It can be molded in a shorter time, and higher bonding strength can be obtained.
In this way, in each groove 85a, the tip portion 52c are integrated, the shape of a cylindrical distal joint 8 2a is formed (see FIG. 21 (b)).

After the elapse of a certain molding time, the heating of the molds 85A and 85B is stopped, and the tip joint portion 52a is cooled to a temperature lower than the glass transition temperature.
After cooling, the mold 85A, is demolded distal joint 8 2a Open 85B (see FIG. 21 (c)).
In this way, the tip joint portion 82a is formed.

  As described above, the tip joint portion 82a is a joint portion of the same material, and is, for example, a joint superior in strength, corrosion resistance, and the like as compared with a joint including a heterogeneous portion of material by soldering or welding. The part can be formed.

  When the basket portion 82 is formed at one end of the operation wire 83 in this way, the basket forceps 80 is assembled in the same manner as in the second embodiment.

According to the basket forceps 80 of the present embodiment, the basket forceps 50 of the second embodiment is different from the basket forceps 50 of the second embodiment only in the wire configuration of the basket portion 82 and the operation wire 83 that are treatment portions, A treatment in the body cavity can be performed by inserting the treatment tool channel of the endoscope.
By repeating such treatment, the operation wire 83 of the basket forceps 80 is subjected to repeated loads such as bending, pulling, and compression. In this embodiment, the treatment wire 83 is used as the operation wire 83. Therefore, even if such a repeated load acts, for example, the elongation due to plastic deformation can be reduced as compared with the wire for a treatment instrument made only of a conventional SUS wire or Ni-Ti alloy wire, so it is durable. Can be improved.

Further, in the basket forceps 80, since the basket portion 82 is constituted by the first strands 33 extending from the operation wire 83 and having a breaking elongation of 5% or less, the plastic deformation is reduced and the strength is high. A high treatment section can be configured.
Moreover, in this embodiment, since the 1st strand 33 is comprised with a metal glass, since the front-end | tip joining part 82a can be favorably joined without using another joining material, manufacture becomes easy and reduces a number of parts. be able to.
In addition, since both of the distal end joining portion 82a and the proximal end joining portion 82b are cooled after being press-molded in a state of being heated to the glass transition region, the residual stress is relaxed or removed, and the residual Strength reduction due to the influence of stress can be reduced or prevented.

  In the description of the first embodiment and the first to nineteenth modifications, as a particularly preferable example, the metal material of the first strand 2 is metallic glass, and the metal material of the second strand 3 is SUS or Although the example in the case of a Ni-Ti alloy was demonstrated, if it is a metal material which satisfy | fills the conditions of break elongation, it can be set as the structure which combined and combined the appropriate metal material.

  Moreover, in description of said 1st Embodiment and 1st-19th modification, the wire for treatment tools is 1x7 wire, 3x7 wire, 7x7 wire, 7x3 wire, 1x Although the example in the case of 19 wires has been described, the number of strands and the number of strands are not limited to these combinations, and other configurations may be adopted.

In the description of the first embodiment and the modifications thereof, the representative test method for evaluating the bending durability is exemplified, but the bending resistance can be evaluated by other evaluation methods.
In addition, this evaluation is an evaluation in which the embodiment of the present invention is comparatively compared with the comparative example by limiting the wire configuration to 1 × 7 wire, and the bending durability of the embodiment of the present invention is superior to the comparative example. It is specifically shown that Here, the allowable bending durability of 100,000 times in this test method is an example of an allowable value assuming a wire for a treatment tool for a specific application, and when the use application or use site of the treatment tool wire is different. It goes without saying that different tolerances can be set.
For this reason, it is said that the effects of the present invention are not immediately obtained even if other reciprocal uses and use parts, and the wire configurations according to these, cannot be reciprocated 100,000 times without breaking by the exemplified test method. It doesn't matter.

Further, in the description of each of the above embodiments, examples of snares and basket forceps have been described as treatment tools. However, these are examples, and treatment tools using the treatment tool wire according to the present invention are limited to these. Not. For example, a forceps that is inserted into a treatment instrument channel of an endoscope and used in a body cavity may be used as an operation wire for operating opening and closing of the forceps.
Moreover, the treatment tool according to the present invention is not limited to the treatment tool used by being inserted into an endoscope. For example, a treatment tool such as a snare or a basket forceps which is inserted into a body cavity using a trocar or the like and performs treatment may be used.

  In the description of the first and second embodiments, the treatment instrument is provided with the treatment part wire and the operation wire, and each of them is composed of the treatment instrument wire according to the present invention. The treatment instrument according to the present invention is only required to use the treatment instrument wire of the present invention in at least one of the treatment section wire and the operation wire as necessary. In addition, the treatment tool may be configured to include any one of a treatment part wire and an operation wire.

  Moreover, in the said 3rd Embodiment, although the extension part which comprises a treatment part demonstrated in the example in case it consists of a single wire of the metal strand extended from the wire for treatment tools, an extension part is a treatment. A twisted body obtained by twisting a plurality of metal wires constituting the tool wire may be used. As a twisted body, the strand which comprises the wire for treatment tools may be sufficient, and the twisted body which selected the several metal strand may be sufficient.

  In the description of the third embodiment, it has been described that the first strand 33 and the caulking pipe 84 made of the same material may be joined by hot pressing. You may provide other than a junction part. For example, the joining member 57 is made of metal glass, and the first strand 33 is extended from the operation wire 83 and hot-pressed together with the joining member 57 to form a joining portion including a joining portion made of metal glasses. Good. Also in this case, the bonding strength can be improved.

  Moreover, in each said embodiment and each modification, although the example of the wire for treatment tools which consists only of a 1st strand and a 2nd strand was described, the wire for treatment tools is the 1st strand and the 2nd strand Wires made of other metal materials may be included.

Further, in the description of the third modification of the first embodiment, the outer layer portion 4B of the treatment instrument wire 12 is provided on the outer periphery of the first strand 2 in total along the circumferential direction. Although the example in the case where the strands 2 and the total of the second strands 3 in total are arranged one by one and twisted together has been described, the outer layer portion 4B is for a treatment instrument if there is one or more . the resistance to elongation as compared with the wire 1 or the strand S ₁ is the stronger, may be modified with the second wire 3 and the first wire 2 to the wire structure including one or more, respectively. Moreover, you may use such a wire as a strand.

Moreover, all the components described in the above embodiments and modifications can be implemented by appropriately combining or deleting within the scope of the technical idea of the present invention.
For example, you may coat the covering materials 30 and 31 of the said 20th and 21st modification on the outer peripheral surface of each wire for treatment tools of the said 1st Embodiment and a 1st-19th modification.
Moreover, the coating | covering materials 30 and 31 are applicable to the wire for treatment tools of said each modification.
That is, the coating materials 30 and 31 can also be coated on the outer peripheral surface of the wire body in which a plurality of strands are twisted together. However, the covering materials 30 and 31 may be provided not only on the outer peripheral surface of the wire body but also on the outer peripheral surface of the strand.
Further, the treatment instrument wires of the first to twenty-first modifications of the first embodiment are all treated instruments of the second and third embodiments as long as necessary strength, electrical characteristics and the like are satisfied. Can be used.

In the description of the first embodiment, the wire body in which the strands are twisted is selected from the strands S ₁ , S ₂ , S ₅ , S ₆ , S ₇ , S _8, etc. Although the example in the case of combining several strands was shown, these showed only some of the possible combinations, and the combination of strands is not limited to these. That is, the treatment instrument wire according to the present invention can be used as all strands, and a strand including two or more of these strands can be twisted to form an appropriate wire body.

1, 1A, 1B, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 33 Wire 2 for treatment device 2a, 33 First strand (first strand)
3 Second strand (second strand)
4A, 4B, 4C Outer layer part 8 Large diameter element wire 8a First large diameter element line 8b Second large diameter element line 9 Small diameter element line 9a First small diameter element line 9b Second small diameter element line 30, 31 Coating material 40 Snare ( Treatment tool)
42, 53, 83 Operation wire 43 Snare wire (treatment section wire)
50, 80 Basket forceps (treatment tool)
52, 52 Basket part (treatment part)
52A, 52B, 52C, 52D Basket wire (treatment section wire)
82A, 82B, 82C, 82D Basket wire (treatment part wire, extension part)
52a Tip joint 52b Base joint 82a Tip joint (caulking fixing part)
82b Base end joint (caulking fixing part)
_{S 1, S 2, S 3} , S 4, S 5, S 6, S 7, S 8, S t1, S t2, S t3, S t4, S t5, S t6, S t7 strands

Claims (12)

A treatment unit for performing treatment on a living tissue;
A wire for a treatment instrument in which a plurality of metal strands are twisted together ,
The plurality of metal strands include a first strand and a second strand, the breaking elongation of the first strand is 5% or less, and the breaking elongation of the second strand is 20 The treatment tool characterized by being more than% . The first strand is made of a metallic glass that is an amorphous alloy having a glass transition region of 20K or more,
The treatment tool according to claim 1, wherein the second strand is made of stainless steel or a nickel-titanium alloy . The treatment tool according to claim 2, wherein the first strand is made of zirconium-based metallic glass . The first strand and the second strand are twisted together to form at least one strand,
The outer peripheral surface of the strand is formed by the second strand,
The treatment instrument according to any one of claims 1 to 3, wherein the first strand is disposed in a central portion of the strand . The first strand and the second strand are twisted together to form at least one strand,
The outer peripheral surface of the strand is formed by alternately arranging the first strands and the second strands along the circumferential direction,
The treatment instrument according to any one of claims 1 to 3, wherein the first strand is disposed in a central portion of the strand . A wire outer peripheral surface is formed by the second strand,
The treatment tool according to any one of claims 1 to 5, wherein a single wire of the first strand or a stranded wire body of the first strand is disposed at a wire center portion . The treatment tool according to claim 6, wherein the first strand arranged in the center portion of the wire is equal to or larger than a wire diameter of the second strand . Having an operation wire for operating the treatment section;
The treatment tool according to any one of claims 1 to 7 , wherein the operation wire includes the wire for the treatment tool. The wire for the treatment instrument includes an extension portion that extends from the wire end portion of the metal element wire or a twisted body of the metal element wire that constitutes a part of the wire for the treatment instrument,
The treatment instrument according to claim 8 , wherein at least a part of the treatment portion is configured by the extension portion. The treatment instrument according to any one of claims 1 to 7, wherein the treatment unit includes the treatment instrument wire. The first strand of the treatment instrument wire is made of a metallic glass that is an amorphous alloy having a glass transition region of 20K or more,
Treatment instrument according to any one of claims 1 0 to claim 1, characterized in that it comprises a crimping Takashi Me fixing portion by the first wire a hot press. Having an operation wire for operating the treatment section;
The treatment section performs treatment by being pulled by the operation wire.
The treatment tool according to any one of claims 1 to 11, wherein the treatment tool is characterized in that

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