JP2019044305A - Medical equipment operating rope - Google Patents

Abstract

To provide a medical equipment operation rope 2 that has an outstanding torque transmission property.SOLUTION: An operation rope 2 has a piece of core wire 4 and six pieces of lateral wires 6. Lateral wires 6 are spirally wound around the core wire 4. The operation rope 2 has a layer twisting structure of "1+6". The lateral wire 6 unwound from the operation rope 2 is formed into spiral shape. The shape forming ratio is at least 1.01%. The lateral wire 6 is twisted. The twisting angle is at least 10°. The twisting angle is equal to or larger than the twisting angle of the operation rope 2. Straightness of the operation rope 2 at hanging test using a two meter long sample is 3.0 mm or less. The core wire 4 may or may not be twisted.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an operation rope suitable for a medical device.

  In the endoscope treatment tool, the operation section at hand and the treatment section at the tip are connected by an operation rope. When the operator inserts the treatment portion into the body cavity of the patient and operates the operation portion, the operation rope transmits the operation force to the treatment portion. Specifically, the operating rope can transmit a pushing force, a pulling force, and a rotational force (torque) from the operating unit to the treatment unit. By the transmitted force, medical treatment can be performed on the treatment target site in the body.

  The operating rope is particularly required to have excellent torque transmission. If the torque transmission is insufficient, the operation of the operation unit is not reproduced in the treatment unit. Furthermore, in the medical device field, the flexibility of the operating rope is required as the diameter of the medical device is reduced.

  Japanese Patent Application Laid-Open No. 2017-8464 discloses an operation rope having a side wire forming rate of more than 100% and 110% or less. This operating rope is excellent in torque transmission and flexible.

  Japanese Unexamined Patent Application Publication No. 2017-8465 discloses an operation rope having a flatness exceeding 1.00 and not exceeding 1.10. This operating rope is excellent in torque transmission and flexible.

JP 2017-8464 A JP 2017-8465 Gazette

  In recent years when medical equipment has advanced, more excellent torque transmission is desired for the rope for operation. An object of the present invention is to provide a rope for operating a medical device that is extremely excellent in torque transmission.

  The rope for operation of the medical device according to the present invention includes a layer twist structure having a core strand and a side strand twisted in a spiral shape outside the core strand. This side strand has a twist.

  Preferably, the twist angle of the side strand is 10 ° or more. Preferably, the twist angle is equal to or greater than the twist angle of the side strands.

  Preferably, the straightness in the suspension test of a sample obtained from the operation rope and having a length of 2 m is 3.0 mm or less.

  Preferably, the core strand has a twist.

  Preferably, the contour shape when the side strand is viewed from the axial direction is an ellipse. Preferably, the long-axis molding rate of the ellipse is 101% or more.

The combination according to the present invention is:
(1) Operation of a medical device having a layer twist structure having a core strand and a side strand twisted spirally outside the core strand, and the side strand has a twist For rope,
And (2) a reel around which the operation rope is wound.

  The rope for operation according to the present invention is excellent in torque transmission.

FIG. 1 is a front view showing a part of an operation rope of a medical device according to an embodiment of the present invention. FIG. 2 is an enlarged cross-sectional view schematically showing the operation rope of FIG. FIG. 3 is a perspective view showing a part of the side strand of the operation rope of FIG. FIG. 4 is an enlarged right side view in which the side strands of FIG. 3 are shown. FIG. 5 is an enlarged front view showing a part of the side strand of FIG. FIG. 6 is an explanatory diagram showing a method for measuring the straightness of the operating rope of FIG. FIG. 7 is a cross-sectional view illustrating an operation rope for a medical device according to another embodiment of the present invention. FIG. 8 is a cross-sectional view illustrating an operation rope for a medical device according to still another embodiment of the present invention. FIG. 9 is an explanatory diagram showing a method for measuring torque transmission of the operating rope of FIG. FIG. 10 is a graph showing the results of torque transmission measured by the method of FIG.

  Hereinafter, the present invention will be described in detail based on preferred embodiments with appropriate reference to the drawings.

  FIG. 1 shows an operation rope 2. The operation rope 2 is made of a metal material. This operation rope 2 is long. The rope 2 for operation is cut into a predetermined length and used as a member of a medical device. For example, the proximal end portion is connected to the hand operation portion of the medical device, and the distal end portion is connected to the treatment portion. The pushing force, pulling force and torque applied to the proximal end portion are transmitted to the distal end portion via the operation rope 2. Thereby, a treatment part raises treatment operation.

  FIG. 2 is an enlarged cross-sectional view of the operation rope 2. FIG. 2 shows a cross section perpendicular to the length direction of the operating rope 2. The operation rope 2 has one core strand 4 and six side strands 6. Specifically, the operation rope 2 includes a first side strand 6a, a second side strand 6b, a third side strand 6c, a fourth side strand 6d, a fifth side strand 6e, and a sixth side. It has a strand 6f. In FIG. 2, an arrow D indicates the diameter of the operation rope 2. A typical diameter D is from 0.3 mm to 5 mm.

  Each side strand 6 is wound around the core strand 4 in a spiral shape. In this embodiment, the side strand 6 is twisted counterclockwise from the left side to the right side in FIG. This operating rope 2 has a so-called layer twist structure. In this embodiment, the operating rope 2 has a “1 + 6” layer twist structure. Six side strands (6a-6f) form the outermost layer in this layer twist structure. In FIG. 1, what is indicated by the symbol α is the twist angle (absolute value) of the side strand 6.

  FIG. 3 is a perspective view showing a part of the side strand 6 of the operation rope 2 of FIG. FIG. 3 shows the side strand 6 loosened from the operation rope 2 in the state shown in FIG. This side strand 6 is typed. Therefore, as shown in FIG. 3, the side strand 6 has a substantially spiral shape in the loosened state. The left-right direction in FIG. 3 is the axial direction of the spiral.

  FIG. 3 shows a plurality of dice marks 8. Each die mark 8 is formed when the side strand 6 is manufactured by wire drawing. The dice mark 8 is a line pattern resulting from a wire drawing die. The dice mark 8 is present on the surface of the side strand 6. The die mark 8 extends in the wire drawing direction. In FIG. 3, the dice mark 8 is formed over the entire length of the side strand 6. The dice mark 8 may be formed on a part of the side strand 6. The dice mark 8 may not be formed on the side strand 6.

  FIG. 4 is an enlarged right side view in which the side strand 6 of FIG. 3 is shown. In other words, in FIG. 4, the side strand 6 is seen from the axial direction of the spiral of the side strand 6. As is apparent from FIG. 4, the contour shape of the side strand 6 is an ellipse. In the rope 2 for operation, the frictional force between the side strand 6 and the core strand 4 is large. Therefore, in this rope 2 for operation, the energy loss at the time of rotation is small. This operating rope 2 is excellent in torque transmission.

  The ellipse includes those having only a curve and those having a curve and a straight line. In either case, the ellipse does not have an inwardly convex portion. Furthermore, an ellipse does not have a vertex. The concept of an ellipse includes an ellipse. Geometric shapes that are not geometrically perfect ellipses and are close to ellipses are also included in the concept of an ellipse. The ideal ellipse is an ellipse.

  In FIG. 4, the side strand 6 is placed on the table 10. The upper surface 12 of the table 10 is horizontal. The table 10 is made of a hard material and is not deformed by the mass of the side wires 6. The side strand 6 placed on the upper surface 12 of the table 10 rolls by its own weight and takes a posture in which the long axis is horizontal as shown in FIG. In FIG. 4, the length of the major axis (ie, the major axis) is indicated by the symbol L1, and the length of the minor axis (ie, the minor axis) is indicated by the symbol L2. The short axis is orthogonal to the long axis. The major axis L1 is measured along the horizontal direction. The minor axis L2 is measured along the vertical direction.

  From the viewpoint of torque transmission, the oval flatness (L1 / L2) is preferably 1.01 or more, and particularly preferably 1.02 or more. From the viewpoint that the gap between the side strand 6 and the core strand 4 is suppressed, the flatness ratio (L1 / L2) is preferably 1.10 or less, more preferably 1.08 or less, and 1.05 or less. Is particularly preferred.

  FIG. 5 is an enlarged front view showing a part of the side strand 6 of FIG. As is apparent from FIGS. 3 and 5, the dice mark 8 has a spiral shape. This indicates that the side strand 6 has a twist. The twist is intentionally formed. In this embodiment, the twist is formed counterclockwise from the left side to the right side in FIG. In FIG. 5, what is indicated by a symbol β is a twist angle (absolute value).

  Since the side strand 6 (that is, the outermost layer) has a twist, the twisting rigidity of the operating rope 2 is high. In the operation rope 2, it is difficult for twisting to occur when torque is transmitted. This operating rope 2 is excellent in torque transmission. This operating rope 2 is suitable for medical equipment.

  From the viewpoint of torque transmission, the twist angle β is preferably 5 ° (degree) or more, more preferably 8 ° or more, and particularly preferably 10 ° or more. From the viewpoint that the side strand 6 is not easily broken during production, the twist angle β is preferably 30 ° or less, more preferably 25 ° or less, and particularly preferably 15 ° or less.

  From the viewpoint of torque transmission, the twist angle β is preferably equal to or larger than the twist angle α.

  In this embodiment, the operation rope 2 has six side strands (6a-6f) having twists in the same direction. The operating rope 2 can be easily manufactured.

  The rope 2 for operation may have the side strand 6 from which a mutually twist direction differs. For example, the first side strand 6a, the third side strand 6c and the fifth side strand 6e have a counterclockwise twist, and the second side strand 6b, the fourth side strand 6d and the sixth side strand The line 6f may have a clockwise twist. In the operation rope 2, the residual stress of the side strand 6 having a counterclockwise twist and the residual stress of the side strand 6 having a clockwise twist can be offset. It is preferable that the side strands (6a, 6c, 6e) having a counterclockwise twist and the side strands (6b, 6d, 6f) having a clockwise twist are alternately arranged.

  In this embodiment, the twisting direction is counterclockwise, and the twisting directions of all the side wires 6 are also counterclockwise. The operating rope 2 can be easily manufactured. The twisting direction may be different from the twisting direction.

The molding rate P of the long diameter L1 is preferably 101% or more. In the operation rope 2 having a molding rate P of 101% or more, the frictional force between the side strand 6 and the side strand 6 adjacent thereto is large. On the other hand, in this operating rope 2, the frictional force between the side strand 6 and the core strand 4 is small. In this operating rope 2, energy loss during rotation is small. Therefore, this operating rope 2 is excellent in torque transmission. In addition, the operation rope 2 having a molding rate P of 101% or more is supple. From the viewpoint of torque transmission and flexibility, the molding rate P is particularly preferably 102% or more. In light of suppression of a gap between the side strand 6 and the side strand 6 adjacent thereto, the molding rate P is preferably 110% or less, and particularly preferably 105% or less. The molding rate P is the ratio of the major axis L1 to the diameter D of the operation rope 2. The typing rate P is calculated by the following mathematical formula.
P = (L1 / D) * 100

  In this embodiment, the core wire 4 has a twist. This operating rope 2 is excellent in torque transmission. The direction of twist of the core strand 4 is the same as the direction of twist of the side strand 6. The direction of twist of the core strand 4 may be different from the direction of twist of the side strand 6. The core wire 4 does not have to be twisted.

  From the viewpoint of torque transmission, the twist angle of the core wire 4 is preferably 5 ° or more, more preferably 8 ° or more, and particularly preferably 10 ° or more. From the viewpoint that the core strand 4 is not easily broken during production, the twist angle is preferably 30 ° or less, more preferably 25 ° or less, and particularly preferably 15 ° or less. The twist angle of the core strand 4 can be measured by the same method as the twist angle β of the side strand 6.

  As described above, the operation rope 2 is made of a metal material. Preferred metal materials include stainless steel and nickel-titanium alloy. A preferred stainless steel is an austenitic stainless steel. SUS304 and SUS316 are illustrated as specific examples of austenitic stainless steel.

  The material of the side strand 6 may be the same as or different from the material of the core strand 4. The tensile strength of the side strand 6 is preferably 2000 MPa or more, more preferably 2500 MPa or more, and particularly preferably 2800 MPa or more. The tensile strength of the core wire 4 is preferably 2000 MPa or more, more preferably 2500 MPa or more, and particularly preferably 2800 MPa or more.

  The initial elongation of the rope 2 for operation is preferably 0.04% or more and 0.10% or less. The operation rope 2 having an initial elongation of 0.04% or more is supple. The operating rope 2 can be easily bent. In this respect, the initial elongation is more preferably equal to or greater than 0.05%, and particularly preferably equal to or greater than 0.06%. The operating rope 2 having an initial elongation of 0.10% or less is excellent in strength. In this respect, the initial elongation is more preferably equal to or less than 0.09%, and particularly preferably equal to or less than 0.08%.

  The initial elongation rate is measured by a tensile test defined in “JIS Z 2241 (2011)”. In this tensile test, the elongation percentage when a load that is 1.0% of the breaking load is applied to the operating rope 2 is the initial elongation percentage.

  From the viewpoint of flexibility, the twist angle α of the operation rope 2 is preferably 5 ° or more, more preferably 8 ° or more, and particularly preferably 10 ° or more. From the viewpoint of easy manufacture of the rope 2 for operation, the twist angle α is preferably 30 ° or less, more preferably 25 ° or less, and particularly preferably 15 ° or less.

  FIG. 6 is an explanatory diagram showing a method for measuring the straightness of the operating rope 2 of FIG. In this measurement, the vicinity of the upper end of the operation rope 2 is chucked by the jig 14. A portion of the operation rope 2 that is not chucked is referred to as a free portion 16. The force acting on the free part 16 is only gravity. In FIG. 6, the upper end of the free portion 16 is indicated by a point P <b> 1, and the lower end of the free portion 16 is indicated by a point P <b> 2. The distance from the upper end P1 to the lower end P2 is 2.00 m. The two-dot chain line in FIG. 6 extends in the vertical direction. In FIG. 6, what is indicated by a symbol S is a distance (mm) between the lower end P2 and the two-dot chain line. This distance S is the deviation of the lower end P2 of the operation rope 2 from the vertical line. This distance S is straightness. The rope 2 for operation with the small distance S is excellent in straightness. The operation rope 2 that is inferior in straightness has a large distance S due to the curvature of the operation rope 2.

  The straightness S of the operation rope 2 is preferably 3.0 mm or less. The rope 2 for operation whose straightness S is 3.0 mm or less is excellent in torque transmission. In this respect, the straightness S is more preferably equal to or less than 2.5 mm, and particularly preferably equal to or less than 2.0 mm. Ideally, the straightness S is zero.

  As an apparatus suitable for manufacturing the operating rope 2, a tubular type stranded wire machine can be cited. In the manufacturing method using the tubular type stranding machine, six side strands 6 to which a twist of an arbitrary angle β is applied in advance are prepared. Furthermore, a core wire 4 is also prepared. The core wire 4 may or may not have a twist. The side strand 6 and the core strand 4 are supplied to a tubular type strand wire machine. In this tubular type stranded wire machine, the side strand 6 is spirally wound around the core strand 4 to obtain a stranded wire. This stranded wire is wound on a reel. This stranded wire is subjected to heat treatment. The heat treatment is performed in a state where a stranded wire is wound around a reel. By this heat treatment, the operation rope 2 wound on the reel is obtained. This operation rope 2 is long. The combination of the operation rope 2 and the reel is excellent in usability.

  In the manufacturing method using the tubular type stranded wire machine, the twist angle β can be adjusted without being affected by the twist angle α.

  A buncher type stranded wire machine may be used for manufacturing the operation rope 2. In this buncher type stranded wire machine, twisting is imparted to the side strand 6 simultaneously with the twisting. Accordingly, the side strand 6 having no twist can be supplied to the buncher type stranded wire machine. The side strand 6 to which the twist of an arbitrary angle is previously given may be supplied to a buncher type strand wire machine. Further twisting can be applied to the side strand 6 having twisting by a buncher type stranding machine.

  FIG. 7 is a cross-sectional view showing an operation rope 18 for a medical device according to another embodiment of the present invention. Although not shown, the operation rope 18 is long like the operation rope 2 shown in FIGS. 1 and 2. FIG. 7 shows a cross section perpendicular to the length direction of the operation rope 18.

  The operation rope 18 has a core strand 20 and nine side strands 22. The core strand 20 is formed by twisting three core strands 24. Although not shown, each side strand 22 is spirally wound around the core strand 20. The operation rope 18 has a so-called layer twist structure. In this embodiment, the operating rope 18 has a “3 + 9” layer twist structure. The nine side strands 22 form the outermost layer in the layer twist structure. In FIG. 7, an arrow D indicates the diameter of the operation rope 18. A typical diameter D is from 0.3 mm to 5 mm.

  The side strands 22 loosened from the operating rope 18 have a substantially spiral shape, like the side strands 6 shown in FIGS. The contour shape of the side strand 22 is an ellipse. This operating rope 18 is excellent in torque transmission. The oblateness of the ellipse is equivalent to that of the side strand 6 shown in FIG.

  The side strand 22 has a twist like the side strand 6 shown in FIGS. This operating rope 18 is excellent in torque transmission. The twist angle and direction are the same as those of the side wires 6 shown in FIGS. The twist angle is preferably equal to or larger than the twist angle.

  The long diameter mold rate of the side strands 22 is equivalent to that of the side strands 6 shown in FIGS.

  The core wire 24 has a twist. The direction and angle of twist are the same as those of the core wire 4 shown in FIG. The core wire 24 may not have a twist.

  The material, initial elongation, twist angle, and straightness of the operation rope 18 are equivalent to those of the operation rope 2 shown in FIGS.

  A tubular type stranded wire machine and a buncher type stranded wire machine can be used for manufacturing the operating rope 18. The stranded wire obtained by the stranded wire machine is wound around a reel, and the stranded wire is subjected to heat treatment.

  FIG. 8 is a cross-sectional view illustrating an operation rope 26 for a medical device according to still another embodiment of the present invention. Although not shown, the operation rope 26 is long like the operation rope 2 shown in FIGS. FIG. 8 shows a cross section perpendicular to the length direction of the operation rope 26.

  The rope 26 for operation has a core strand 28, six large-diameter side strands 30, and six small-diameter side strands 32. The core strand 28 has one core strand 34 and six intermediate strands 36. Although not shown, each intermediate strand 36 is spirally wound around the core strand 34. The core strand 28 has a “1 + 6” structure.

  Although not shown, each large-diameter side wire 30 is spirally wound around the core strand 28. Each small-diameter side strand 32 is wound around the core strand 28 in a spiral shape. The large-diameter side strands 30 and the small-diameter side strands 32 are alternately arranged along the circumferential direction. The operation rope 26 has a so-called layer twist structure. In this embodiment, the operation rope 26 has a layer twist structure of “1 + 6 + 12”. The six large-diameter side strands 30 and the six small-diameter side strands 32 form the outermost layer in the layer twist structure. In FIG. 8, an arrow D indicates the diameter of the operation rope 26. A typical diameter D is from 0.3 mm to 5 mm.

  The large-diameter side strand 30 loosened from the operation rope 26 has a substantially spiral shape, like the side strand 6 shown in FIGS. The outline shape of the large-diameter side strand 30 is an ellipse. The small-diameter side strand 32 loosened from the operation rope 26 has a substantially spiral shape, like the side strand 6 shown in FIGS. The outline shape of the small-diameter side strand 32 is an ellipse. The operation rope 26 is excellent in torque transmission. The oblateness of the ellipse is equivalent to that of the side strand 6 shown in FIG.

  The large-diameter side strand 30 has a twist like the side strand 6 shown in FIGS. The small-diameter side strand 32 has a twist like the side strand 6 shown in FIGS. The operation rope 26 is excellent in torque transmission. The twist angle and direction are the same as those of the side wires 6 shown in FIGS. The twist angle is preferably equal to or larger than the twist angle.

  The long-diameter molding rate of the large-diameter side strand 30 is equivalent to that of the side strand 6 shown in FIG. The molding ratio of the long diameter of the small-diameter side strand 32 is equivalent to that of the side strand 6 shown in FIG.

  The core wire 34 has a twist. The direction and angle of twist are the same as those of the core wire shown in FIG. The core wire 34 does not have to be twisted.

  The intermediate strand 36 has a twist. The direction and angle of torsion are the same as those of the side strand 6 shown in FIGS. The intermediate strand 36 does not have to be twisted.

  The material, initial elongation, twist angle, and straightness of the operation rope 26 are the same as those of the operation rope 2 shown in FIG.

  A tubular type stranded wire machine and a buncher type stranded wire machine can be used for manufacturing the operation rope 26. The stranded wire obtained by the stranded wire machine is wound around a reel, and the stranded wire is subjected to heat treatment.

  The operation rope 2 having the “1 + 6” layer twist structure, the operation rope 18 having the “3 + 9” layer twist structure, and the operation rope 26 having the “1 + 6 + 12” layer twist structure have been described above. The layer twist structure of the operating rope according to the present invention is not limited to these. Various layer twist structures can be employed for the operating rope. In any of the ropes for operation, the side strand corresponding to the outermost layer is twisted spirally around the core and has a twist.

  Hereinafter, the effects of the present invention will be clarified by examples. However, the present invention should not be construed in a limited manner based on the description of the examples.

[Example 1]
The steel material whose material is SUS304 was drawn to obtain a core wire having a diameter of 0.25 mm. The tensile strength of the core wire was 2800 MPa. The steel material of SUS304 was drawn and twisted to obtain a side strand having a diameter of 0.23 mm. The twist angle β of this side strand was 15 °. The tensile strength of this side strand was 2800 MPa. One core strand and six side strands were supplied to the stranding machine to obtain a strand having the structure shown in FIGS. The twist pitch of this stranded wire was 5.5 mm. The stranded wire was straightened by subjecting it to a continuous heat treatment at a temperature of 500 ° C., and the operation rope of Example 1 was obtained.

[Comparative Example 1]
An operation rope of Comparative Example 1 was obtained in the same manner as in Example 1 except that the side strand was not twisted and the shape of the side strand was a circle.

[Example 2-5]
An operation rope of Example 2-5 was obtained in the same manner as Example 1 except that the straightening conditions were changed.

[Comparative Example 2]
An operation rope of Comparative Example 2 was obtained in the same manner as in Example 1 except that the side strand was not twisted and the core strand was twisted before being supplied to the stranding machine.

[Examples 6 and 7]
Before supplying to the stranding machine, the ropes for operation of Examples 6 and 7 were obtained in the same manner as in Example 1 except that the core wire was twisted.

[Example 8-10]
An operating rope of Example 8-10 was obtained in the same manner as in Example 1 except that the shape of the side strands was as shown in Table 2 below.

[Examples 11-14 and Comparative Example 3]
Operation ropes of Examples 11-14 and Comparative Example 3 were obtained in the same manner as in Example 1 except that the twist angle β of the side strands was as shown in Table 3 below.

[Comparative Example 2]
The operation rope of Comparative Example 1 was obtained in the same manner as in Example 1 except that the side strand was not twisted and the core strand was twisted.

[Evaluation of torque transmission]
The torque transmission property is evaluated by the difference between the rotation angle on the proximal end side and the rotation angle on the distal end side when the proximal end side of the operation rope is rotated. As shown in FIG. 9, a hard pipe 44 having a double spiral portion 38, a first straight portion 40, and a second straight portion 42 is prepared. The diameter of the double spiral part 38 is 200 mm. The operation rope 2 is passed through the hard pipe 44. A rotational force is applied to the base end side 46 of the operating rope 2 in the direction indicated by the arrow A1 in FIG. Thereby, the front end side 48 of the rope 2 for operation rotates as shown by arrow A2. The rotation angle on the proximal side 46 and the rotation angle on the distal side 48 are measured simultaneously.

  FIG. 10 is a graph showing the results of torque transmission measured by the method of FIG. In FIG. 10, the rotation angle on the proximal end side of the operation rope and the rotation angle on the distal end side at the same point are shown in association with each other. In other words, FIG. 10 is a graph showing the relationship between the input rotation angle and the output rotation angle with respect to the operation rope. The broken line in the graph is a straight line indicating that the difference between the rotation angle on the proximal end side and the rotation angle on the distal end side is zero in the entire measurement angle range (range where the input rotation angle is from 0 ° to about 720 °). It is. The difference between the rotation angle on the proximal end side and the rotation angle on the distal end side of the operation rope to be measured is expressed as a difference in the vertical axis direction between the broken line and the measurement value curve in the figure. Of the rotation angle differences measured in the range of 0 ° to 720 ° of the input rotation angle, the maximum angle difference is a value that correlates with torque transmission. The maximum angle difference of each rope is shown in the following Table 1-3 as an index when the maximum angle difference of Comparative Example 1 is 100. An operation rope having a small index has excellent torque transmission.

  As shown in Table 1-3, the rope for operation of each example is excellent in torque transmission. From this evaluation result, the superiority of the present invention is clear.

  The operation rope according to the present invention can be applied to various medical devices.

2, 18, 26 ... Rope for operation 4, 24, 34 ... Core strand 6, 22 ... Side strand 8 ... Dice mark 20, 28 ... Core strand 30 ... Large Diameter side strand 32 ... Small diameter side strand 36 ... Intermediate side strand

Claims (8)

It has a layer twist structure having a core strand and a side strand twisted spirally outside the core strand,
A rope for operating a medical device, wherein the side strand has a twist.   The rope for operation according to claim 1, wherein the twist angle of the side strand is 10 ° or more.   The rope for operation according to claim 1 or 2 whose twist angle of said side strand is more than the twist angle of said side strand.   The operating rope according to any one of claims 1 to 3, wherein the straightness in a hanging test with a sample having a length of 2 m is 3.0 mm or less.   The operating rope according to any one of claims 1 to 4, wherein the core wire has a twist.   The rope for operation according to any one of claims 1 to 5, wherein a contour shape when the side strand is viewed from an axial direction is an ellipse.   The rope for operation according to claim 6, wherein a molding ratio of a major axis of the ellipse is 101% or more. (1) Operation of a medical device having a layer twist structure having a core strand and a side strand twisted spirally outside the core strand, and the side strand has a twist For rope,
And (2) A combination including a reel on which the operation rope is wound.

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