JP2013158588A - Medical coil, medical device and method for producing medical coil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a medical coil and a medical device with a structure having excellent production stability and allowing improvement of productivity, and to provide a method for producing the medical coil.SOLUTION: A coil 3 is one for a medical device used for the medical device. In the coil 3, a winding wire 31 whose section orthogonal to the long direction has a shape formed with a recessed part 311 cutting off a part of a circle is wound.

Description

  The present invention relates to a medical device coil, a medical device, and a method for manufacturing a medical device coil.

Conventionally, coils have been used in medical devices. For example, in a long medical device that is inserted into a body cavity such as a blood vessel, a rotation operation may be performed so that the distal end portion thereof faces a desired direction. A coil may be used in a long medical device in order to reliably transmit the rotating operation at hand performed by the user to the tip (for example, Patent Document 1).
Such a coil is arranged along the longitudinal direction of the medical device.

JP 2010-88833 A

When manufacturing such a coil, the winding is wound around the core. Thereafter, the coil is removed from the winding core, but at this time, the winding may be loosened.
In order to prevent the coil from loosening, a method of performing a heat treatment in a state where the winding is wound around the winding core, a method of removing stress by hitting the periphery of the winding, and the like have been proposed.
However, in such a method, time is required for the heat treatment and the productivity is poor.

  According to the present invention, a medical coil used for a medical device, the cross section orthogonal to the longitudinal direction has a shape in which a concave portion lacking a circular shape is formed, or a convex portion protruding from a circular shape There is provided a medical coil that is formed by winding a wound wire having a shape formed with a wire.

  According to the present invention, the winding has a shape in which a cross section orthogonal to the longitudinal direction is formed with a concave portion lacking a part of a circle, or a shape in which a convex portion protruding from a circle is formed. Since the winding of such a shape has a concave or convex part, the distribution of stress generated when winding is non-uniform compared to conventional windings such as a round wire, and concentrated at a specific location. Easier to plastically deform. Therefore, a medical coil wound with such a winding is less likely to spring back and has a structure with excellent manufacturing stability. Furthermore, since spring back is less likely to occur, the treatment time for heat treatment to remove stress can be shortened compared to the conventional case, and the treatment itself can be made unnecessary. It becomes a coil.

  Moreover, according to this invention, a medical device provided with the medical coil mentioned above can also be provided.

Furthermore, according to this invention, the manufacturing method of the medical coil mentioned above can also be provided.
That is, according to the present invention, the cross section orthogonal to the longitudinal direction has a cross-sectional shape in which a concave portion lacking a part of a circle is formed, or a cross-sectional shape in which a convex portion protruding from a circular shape is formed. A step of applying a first bending stress to the wire and winding the wire on the bobbin; and feeding the winding from the bobbin; and a second larger than the first bending stress with respect to the winding And a step of winding the winding around the core while plastically deforming the winding by applying a bending stress of.

  ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of the medical coil of the structure which is excellent in manufacturing stability and can improve productivity, a medical device, and a medical coil is provided.

It is a schematic diagram which shows the coil manufacturing apparatus concerning one Embodiment of this invention. It is a top view of a winding. It is sectional drawing of the direction orthogonal to the longitudinal direction of the winding before winding (before becoming a coil). (A) is a perspective view which shows a coil, (b) is the elements on larger scale of (a). It is sectional drawing of the direction orthogonal to the longitudinal direction of the winding after winding (state of a coil). It is a schematic diagram which shows the process of winding a winding with respect to a winding core. It is a sectional side view of the front-end | tip part of a catheter. It is a side view which shows the whole catheter, and a side view which shows the bending example of a front-end | tip part, Comprising: (a) is a side view which shows the whole before bending a catheter, (b) is a tip by operating a slider. (C) is a side view showing a state where the tip is bent upward with a larger curvature than (b) by operating the slider. It is a side view which shows the state which operated the slider and bent the front-end | tip downward, (e) is a side view which shows the state which operated the slider and bent the front-end | tip with the curvature larger than (d). It is. It is sectional drawing of the winding concerning 2nd embodiment of this invention, (a) is sectional drawing of the direction orthogonal to the longitudinal direction of the winding before winding (before becoming a coil). (B) is sectional drawing of the direction orthogonal to the longitudinal direction of the winding after winding (coil state). It is sectional drawing of the winding concerning 3rd embodiment of this invention, (a) is sectional drawing of the direction orthogonal to the longitudinal direction of the winding before winding (before becoming a coil). (B) is sectional drawing of the direction orthogonal to the longitudinal direction of the winding after winding (coil state). It is sectional drawing of the winding concerning 4th embodiment of this invention, (a) is sectional drawing of the direction orthogonal to the longitudinal direction of the winding before winding (before becoming a coil). (B) is sectional drawing of the direction orthogonal to the longitudinal direction of the winding after winding (coil state). It is sectional drawing of the winding concerning the modification of this invention, and is sectional drawing of the direction orthogonal to the longitudinal direction of the winding before winding (before becoming a coil). It is sectional drawing of the winding concerning the modification of this invention, and is sectional drawing of the direction orthogonal to the longitudinal direction of the winding before winding (before becoming a coil). It is sectional drawing of the winding concerning the modification of this invention, and is sectional drawing of the direction orthogonal to the longitudinal direction of the winding before winding (before becoming a coil). It is sectional drawing of the winding concerning the modification of this invention, and is sectional drawing of the direction orthogonal to the longitudinal direction of the winding before winding (before becoming a coil). It is sectional drawing of the winding concerning the modification of this invention, and is sectional drawing of the direction orthogonal to the longitudinal direction of the winding before winding (before becoming a coil).

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In all the drawings, the same components are denoted by the same reference numerals, and detailed description thereof is appropriately omitted so as not to overlap.
(First embodiment)
The present embodiment will be described with reference to FIGS.
First, an outline of the present embodiment will be described.
The coil 3 of this embodiment is a coil for medical equipment used for medical equipment. The coil 3 is formed by winding a winding 31 having a cross-section perpendicular to the longitudinal direction and having a concave portion 311 that is partially circular.

Next, the coil 3 of this embodiment will be described in detail.
The coil 3 is manufactured using a coil manufacturing apparatus 8 as shown in FIG.
The coil manufacturing apparatus 8 includes a bobbin 81 around which the winding 31 is wound, a rotating body 86, a core 83, and a roller 84 that feeds the core 83.
A bobbin 81 is attached to the rotating body 86, and the rotating body 86 rotates around the core 83 together with the bobbin 81.
From the roller 84, the winding core 83 is sent out, and the winding core 83 is recovered by the roller 85.
The winding 31 is supplied from the bobbin 81 to the winding core 83, and the rotating body 86 rotates, whereby the winding 31 is wound around the winding core 83 and a coil is formed.

The winding 31 is a line extending in one direction as shown in FIG. 2, and as shown in FIG. 3, a recess 311 in which a cross section perpendicular to the longitudinal direction lacks a part of a circle is formed. It has a cross-sectional shape. The recess 311 extends along the longitudinal direction of the winding 31 and is formed over the entire longitudinal direction of the winding 31. The diameter of the winding 31 (the circular diameter) is, for example, 40 to 150 μm.
2 is a plan view of the winding 31, and FIG. 3 is a cross-sectional view in the III-III direction of FIG.
As shown in FIG. 3, the winding 31 has a shape in which a recess 311 is formed by cutting a part of a circular cross section perpendicular to the longitudinal direction. By forming the recess 311, the range of 1/6 to 1/15 of the circular circumference is cut. The recess 311 is recessed toward the circular center of gravity G, and the recess 311 does not pass through the circular center of gravity G, but the depth direction vector of the recess 311 passes through the circular center of gravity G. Is formed. Here, the vector in the depth direction refers to a vector b that passes through the center of the width of the recess 311 and extends in the depth direction of the recess 311 in the cross-sectional view of FIG.
Further, in the cross section orthogonal to the longitudinal direction of the winding 31, the depth d1 of the recess 311 is a distance l1 (a distance along a vector in the depth direction) that is the thickness from the bottom of the recess 311 to the outer periphery of the winding 31. Shorter than).
The depth d1 of the recess 311 is longer than the distance l from the bottom of the recess 311 to the center of gravity G. Here, the depth d1 of the concave portion 311 passes through the center of the width of the concave portion 311 in the cross section orthogonal to the longitudinal direction of the winding 31, and from the intersection of the straight line along the vector in the depth direction and the bottom of the concave portion 311 This corresponds to the length to the intersection of a straight line (indicated by a dotted line in FIG. 3) connecting the tip portions 312A of the pair of regions 312 facing each other across the recess 311 and the straight line along the vector in the depth direction.
The distance l1 is a distance on the vector in the depth direction, and is the length from the intersection with the bottom of the recess 311 to the intersection with the outer periphery of the winding 31 among the line segments passing through the center of the width of the recess 311. Applicable.
In this embodiment, the shape of the recess 311 is a rectangle, and the width of the recess 311 (the length in the direction orthogonal to the depth direction in FIG. 3) is the same throughout the depth direction of the recess 311.
Further, in the cross section orthogonal to the longitudinal direction of the winding 31, the pair of regions 312 facing each other with the recess 311 interposed therebetween is narrower than the other regions, and is a fragile region. . And tip part 312A of a pair of field has an acute angle.
Note that the shape of the recess 311 is not limited to a rectangle, and may be a triangle shape or a polygonal shape of pentagon or more.

Here, in the coil manufacturing apparatus 8, the winding 31 is wound around the bobbin 81, but when the winding 31 is wound around the bobbin 81, the first bending stress acts on the winding 31. Although the winding 31 is elastically deformed, it is hardly plastically deformed and is not tempered according to the shape of the bobbin 81.
As the material of the winding 31, a metal such as stainless steel or nickel titanium alloy can be used. Moreover, the winding 31 in which the recessed part 311 was formed can be manufactured by preparing the metal mold | die according to the cross-sectional shape of the winding 31, melt | dissolving a metal, and extruding. Moreover, you may manufacture the winding 31 by cutting a round wire and forming the recessed part 311 along the longitudinal direction.

  The winding 31 is sent out from the bobbin 81 and wound around the winding core 83. At this time, as shown in the cross-sectional view of FIG. 3, the winding is performed so that the side where the recess 311 is not formed is positioned on the core 83 side and the side where the recess 311 is formed is positioned on the opposite side of the core 83. The wire 31 is wound around the core 83.

Thus, the second bending stress acts on the winding 31 by winding the winding 31 around the winding core 83. This second bending stress is greater than the first bending stress. A winding force is applied to at least one of the pair of regions 312 sandwiching the recess 311 of the winding 31, and the winding 31 is plastically deformed by the second bending stress.
This plastic deformation will be described.
The winding 31 is wound around the winding core 83 in a spiral manner, thereby forming the coil 3 as shown in FIGS. 4 (a) and 4 (b). FIG. 4B is an enlarged view of a part of FIG. And the cross section of the direction (vv direction of FIG.4 (b)) orthogonal to the longitudinal direction of the winding 31 of the coil 3 becomes a shape shown in FIG.
When winding the winding 31 around the winding core 83, as shown in FIG. 6, the region (outer region) opposite to the winding core 83 of the winding 31 is pulled in the longitudinal direction of the winding 31. In other words, a tensile force acts on the outer region of the winding 31 in the direction perpendicular to the paper surface of FIG.
Further, when the winding 31 is wound around the core 83, the region on the core 83 side (inner region) of the winding 31 is compressed along the longitudinal direction of the winding 31, as shown in FIG. 6.
However, an intermediate point between the inner region and the outer region of the winding 31 is a neutral region that is hardly pulled or compressed along the longitudinal direction of the winding 31 (FIGS. 3 and 6). reference).

Since the outer region of the winding 31 is pulled along the longitudinal direction of the winding 31, the outer region of the winding 31 is orthogonal to the longitudinal direction of the winding 31 in a cross section orthogonal to the longitudinal direction of the winding 31. It will shrink in the direction to do.
On the other hand, as described above, the neutral region (see FIG. 3) of the winding 31 is a region that is hardly pulled or compressed along the longitudinal direction of the winding. The outer region tries to approach the neutral region.
These forces act on the pair of regions 312 sandwiching the concave portion 311 of the winding 31, and in this embodiment, the winding 31 is plastically deformed so that the pair of regions 312 approach each other. Therefore, as shown in the sectional view of FIG. 5, the coil 3 has a shape in which the tip portions 312 </ b> A of the pair of regions 312 are close to each other. And in the cross section orthogonal to the longitudinal direction of the winding 31, two or more plastic deformation areas P will be formed. That is, plastic deformation regions P that are plastically deformed are formed on the base end sides of the pair of regions 312.
More specifically, in the present embodiment, the winding 31 is plastically deformed so that the tip portions 312A of the pair of regions 312 are close to each other. And in the cross section orthogonal to the longitudinal direction of the winding 31, the recessed part 311 becomes trapezoid shape, and the width | variety of the recessed part 311 becomes large toward the bottom part side of the recessed part 311. FIG. However, in the present embodiment, the pair of tip portions 312A are not in contact with each other, and a gap is formed between the pair of tip portions 312A.

On the other hand, as described above, when the winding 31 is wound around the core 83, the inner region of the winding 31 is compressed along the longitudinal direction of the winding 31. When the inner region of the winding 31 is compressed along the longitudinal direction of the winding 31, the inner region of the winding 31 swells in a direction perpendicular to the longitudinal direction of the winding 31 according to the Poisson's ratio. Become. In addition, since the neutral region exists in the winding 31 as described above, the inner region of the winding 31 tends to approach the neutral region.
Therefore, as shown in FIG. 5, a plastic deformation region P ′ is also formed in the region on the coil shaft side. However, the degree of plastic deformation (amount of strain) per unit area in the plastic deformation region P is larger than the degree of plastic deformation per unit area of the plastic deformation region P ′ on the coil shaft side.
The degree of plastic deformation can be measured, for example, as follows.
Of the outer peripheral edge of the cross section orthogonal to the longitudinal direction of the winding 31 before being wound around the winding core 83, the length from the tip 312A to the neutral region (in this case, the neutral line) is measured (length A). ).
Next, of the outer peripheral edge of the cross section orthogonal to the longitudinal direction of the winding 31 after being wound around the winding core 83, the length from the tip 312A to the neutral region (here, the neutral line) is measured. (Length A2).
Thereafter, the rate of change is calculated (| A−A2 | / A). This rate of change indicates the degree of plastic deformation in the region P.
On the other hand, among the outer peripheral edges of the cross section orthogonal to the longitudinal direction of the winding 31 before being wound around the winding core 83, the length between the neutral regions (in this case, the neutral line) is measured (length B). .
Next, the length between the neutral regions (in this case, the neutral line) is measured in the outer peripheral edge of the cross section orthogonal to the longitudinal direction of the winding 31 after being wound around the winding core 83 (length B2). ).
The rate of change is calculated (| B−B2 | / B). This rate of change indicates the degree of plastic deformation in the region P ′.

Here, in the present embodiment, when the winding 31 is wound around the core 83, the pair of regions 312 approach each other and the plastic deformation region P is formed. The plastic deformation regions may be formed apart from each other.
As shown in FIG. 3, in the cross section orthogonal to the longitudinal direction of the winding 31, the side surface 311 a of the recess 311 is parallel to the depth vector or inclined with respect to the depth vector. When the distance between the side surfaces 311a is formed so as to increase toward the center of gravity G, the pair of regions 312 approach each other, and a plastic deformation region is formed.
On the other hand, in the cross section perpendicular to the longitudinal direction of the winding 31, the side surface 311a of the recess 311 is inclined with respect to the vector in the depth direction, and the distance between the pair of side surfaces 311a is narrowed toward the center of gravity G. The pair of regions 312 are separated from each other to form a plastic deformation region.

Next, referring to FIGS. 7 and 8, a medical device using the coil 3 as described above will be described. In this embodiment, the medical device is a catheter 100.
FIG. 7 is a cross-sectional view of the catheter 100 along the longitudinal direction.
The catheter 100 includes a tubular body 10, an operation line 70 (70a, 70b), a coat layer 50, and an operation unit 60 (see FIG. 8).

The tubular body 10 includes a sheath including an inner layer 11 having a main lumen therein and an outer layer 12 covering the inner layer 11, a coil 3, a hollow tube 82, and a marker 4.
Hereinafter, the distal ends of the sheath 10 and the catheter 100 are referred to as a distal end DE, but the rear end of the sheath 10 is referred to as a proximal end PE, and the rear end of the catheter 100 is referred to as a proximal end CE.

  The inner layer 11 is a hollow tubular layer, and a main lumen 20 extending along the longitudinal direction of the catheter 100 is formed therein. For example, a fluorine-based thermoplastic polymer material can be used for the inner layer 11. More specifically, polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), perfluoroalkoxy fluororesin (PFA), or the like can be used. By using a fluorine-based resin for the inner layer 11, the delivery property when supplying a contrast medium or a drug solution to the affected area through the main lumen 20 of the catheter 100 is improved.

The outer layer 12 is a resin tubular body that covers the inner layer 11. The outer layer 12 is thicker than the inner layer 11 and constitutes the main thickness of the sheath.
A thermoplastic polymer is widely used for the outer layer 12. Examples include polyimide (PI), polyamideimide (PAI), polyethylene terephthalate (PET), polyethylene (PE), polyamide (PA), nylon elastomer, polyurethane (PU), ethylene-vinyl acetate resin (EVA), poly Vinyl chloride (PVC) or polypropylene (PP) can be used.

The coil 3 is the coil described above, and is arranged so as to surround the inner layer 11. The recess 311 of the winding 31 of the coil 3 is located on the side (outside) opposite to the axis side of the coil 3. The material constituting the outer layer 12 is embedded inside the recess 311, and the adhesion between the outer layer 12 and the coil 3 is enhanced.
In the catheter 100 of this embodiment, the sub-lumen 80 through which the operation lines 70 are inserted is formed inside the outer layer 12 and outside the coil 3.

The hollow tubes 82 (82a, 82b) are embedded in the outer layer 12, and are arranged around the main lumen 20 so that the longitudinal direction thereof is along the longitudinal direction of the main lumen 20.
The hollow tube 82 defines the sub-lumen 80. The hollow tube 82 that defines the sublumen 80 is provided along the longitudinal direction of the catheter 100, and although not shown, the proximal end PE side of the sheath 10 is open. Further, the distal end side of the sheath 10 of the hollow tube 82 is closed by the marker 4.

The hollow tube 82 is disposed outside the coil 3, and the inside of the coil 3, that is, the main lumen 20 is protected against the operation line 70 (70 a, 70 b) disposed inside the hollow tube 82. Yes.
In the present embodiment, a plurality of hollow tubes 82 are provided. Specifically, a plurality of hollow tubes 82 are arranged on the same circumference so as to surround the main lumen 20. In the present embodiment, four hollow tubes 82 are arranged at equal intervals. And the operation line 70 is arrange | positioned inside a pair of hollow tube 82 which opposes on both sides of the center of the main lumen 20. Further, the operation line 70 is not disposed inside the other pair of hollow tubes 82 facing each other across the center of the main lumen 20.
Note that the number of the hollow tubes 82 and the sub-lumens 80 is not limited to four, and can be appropriately selected as necessary.

The hollow tube 82 is made of a material different from that of the outer layer 12. By doing in this way, the hollow tube 82 can be comprised with the material whose bending rigidity and tensile elasticity modulus are higher than the outer layer 12. FIG. Examples of the material constituting the hollow tube 82 include materials such as polytetrafluoroethylene (PTFE), perfluoroalkoxy fluororesin (PFA), and tetrafluoroethylene / hexafluoropropylene copolymer (FEP). . It is preferable that any one or more of these materials are the main component. These materials can improve the slidability of the operation line and have high heat resistance.
By using such a hollow tube 82, the torsional rigidity of the catheter 100 can be increased, and the sheath can be prevented from being locally twisted when the sheath is rotated with its longitudinal direction as the rotation axis.

The operation line 70 is loosely inserted in the sub-lumen 80 and extends along the longitudinal direction of the sub-lumen 80.
The operation line 70 may be configured by a single line, or may be a stranded line configured by twisting a plurality of thin wires.

  7, at the distal end DE of the sheath 10, the tip 71 (71a, 71b) of the operation line 70 (70a, 70b) is fixed to the marker 4 so that the operation line 70 ( The tip portions 71 (71a, 71b) of 70a, 70b) are fixed to the distal end DE. The operation line 70 is slidably inserted through the sub-lumen 80 (80a, 80b). Then, the distal end 15 of the catheter 100 is bent by pulling the proximal end of each operation line 70 (70a, 70b) (see FIG. 8). Further, in the catheter 100 of the present embodiment, the curvature and direction of the bent distal end portion 15 change in a plurality of ways depending on selection of the operation line 70 (70a, 70b) to be pulled.

  Here, as a specific material of the operation line 70, for example, polyether ether ketone (PEEK), polyphenylene sulfide (PPS), polybutylene terephthalate (PBT), polymer fiber such as PI or PTFE, or SUS, Corrosion-resistant coated steel wires, metal wires such as titanium or titanium alloys can be used. In addition to the above materials, PVDF, high density polyethylene (HDPE), polyester, or the like can also be used.

  In addition, as shown in FIG. 8, the catheter 100 includes an operation unit 60. The operation unit 60 is provided at the proximal end portion 17 of the catheter 100. A portion between the distal end portion 15 and the proximal end portion 17 is referred to as an intermediate portion 16.

  The operation unit 60 includes a shaft portion 61 extending in the longitudinal direction of the catheter 100, a slider 64 (64a, 64b) that moves forward and backward in the longitudinal direction of the catheter 100 with respect to the shaft portion 61, and a handle portion that rotates the shaft portion 61 about its axis. 62 and a gripping portion 63 through which the sheath 10 is rotatably inserted. Further, the proximal end portion 17 of the sheath 10 is fixed to the shaft portion 61. Moreover, the handle | steering-wheel part 62 and the axial part 61 are comprised integrally. Then, the entire sheath 10 including the operation line 70 is torque-rotated together with the shaft portion 61 by rotating the grip portion 63 and the handle portion 62 relative to each other.

  Therefore, the operation unit 60 of the present embodiment rotates the distal end portion 15 of the tubular main body (sheath 10). In the present embodiment, a handle portion 62 as a rotation operation portion for torque-rotating the sheath 10 and a slider 64 as a bending operation portion for bending the sheath 10 are integrally provided. However, the present invention is not limited to this, and the handle portion 62 and the slider 64 may be provided separately.

  The proximal end of the first operation line 70 a protrudes from the proximal end portion 17 of the sheath 10 to the proximal end side, and is connected to the slider 64 a of the operation portion 60. Similarly, the proximal end of the second operation line 70 b is also connected to the slider 64 b of the operation unit 60. Then, by sliding the slider 64a and the slider 64b individually to the proximal end side with respect to the shaft portion 61, the first operation line 70a or the second operation line 70b connected thereto is pulled and the distal end of the sheath 10 is pulled. A tensile force is applied to the end portion 15. As a result, the distal end portion 15 bends toward the pulled operation line 70.

  As shown in FIG. 7, the marker 4 is provided at the distal end DE of the sheath 10. The marker 4 is a ring-shaped member made of a material that does not transmit radiation such as X-rays. Specifically, a metal material such as platinum can be used for the marker 4. The marker 4 of this embodiment is provided around the main lumen 20 and inside the outer layer 12.

  The coat layer 50 constitutes the outermost layer of the catheter 100 and is a hydrophilic layer. For the coat layer 50, a hydrophilic material such as polyvinyl alcohol (PVA) or polyvinyl pyrrolidone can be used.

  Here, typical dimensions of the catheter 100 of the present embodiment will be described. The radius of the main lumen 20 is about 200 to 300 μm, the thickness of the inner layer 11 is about 10 to 30 μm, the thickness of the outer layer 12 is about 100 to 150 μm, the outer diameter (diameter) of the coil 3 is about 500 μm to 860 μm, and the coil 3 The inner diameter (diameter) of can be about 420 μm to 660 μm. The radius from the axial center of the catheter 100 to the center of the sublumen 80 can be about 300 to 350 μm, the inner diameter of the sublumen 80 can be about 40 to 100 μm, and the thickness of the operation line 70 can be about 30 to 60 μm. . And the outermost diameter of the catheter 100 can be about 350-490 micrometers.

  That is, the outer diameter of the catheter 100 of this embodiment is less than 1 mm in diameter, and can be inserted into blood vessels such as the celiac artery. Further, the catheter 100 according to the present embodiment is operated freely by pulling the operation line 70 (70a, 70b), so that the catheter 100 can be advanced in a desired direction even in a branching blood vessel, for example. Is possible.

[Operation example]
Next, an operation example of the catheter 100 of the present embodiment will be described with reference to FIG. First, in the catheter 100 of the present embodiment, when the proximal end of the operation line 70 (the first operation line 70a or the second operation line 70b) is pulled, a tensile force is applied to the distal end portion 15 of the catheter 100, Part or all of the distal end portion 15 bends toward the sub-lumen 80 (sub-lumen 80a or sub-lumen 80b) through which the operation line 70 (first operation line 70a or second operation line 70b) is inserted. To do. On the other hand, when the proximal end of the operation line 70 is pushed into the catheter 100, a pushing force is not substantially applied from the operation line 70 to the distal end portion 15 of the catheter 100.

  The distal end portion 15 of the catheter 100 refers to a predetermined length region including the distal end DE of the catheter 100. Similarly, the proximal end portion 17 of the catheter 100 refers to a predetermined length region including the proximal end CE of the catheter 100. The intermediate portion 16 refers to a predetermined length region between the distal end portion 15 and the proximal end portion 17. The bending of the catheter 100 means that a part or all of the catheter 100 is bent or bent.

  In the catheter 100 of this embodiment, the operation line 70 to be pulled is only the first operation line 70a, only the second operation line 70b, or whether the two operation lines 70a and 70b are pulled simultaneously. The curvature of the bent distal end portion 15 changes in a plurality of ways. Thereby, the catheter 100 can be freely entered into a body cavity that branches at various angles.

  The catheter 100 of the present embodiment can individually pull the proximal ends of the plurality of operation lines 70 (the first operation line 70a or the second operation line 70b). The bending direction can be changed by the operating line 70 to be pulled. Specifically, when the first operation line 70a is pulled as shown in FIGS. 8B and 8C, it bends to the side where the first operation line 70a is provided, as shown in FIGS. 8D and 8E. When the second operation line 70b is pulled, the second operation line 70b is bent. Further, the curvature of curvature (the radius of curvature) can be changed by adjusting the pulling amount of each operation line 70 (70a, 70b). Specifically, as shown in FIGS. 8B and 8D, when the first or second operation lines 70a and 70b are slightly pulled, the distal end portion 15 has a small curvature (a large radius of curvature). Bend. On the other hand, as shown in FIGS. 8C and 8E, when the first or second operation line 70a, 70b is pulled longer, the distal end portion 15 bends with a large curvature (a curvature radius is small). .

〔Production method〕
Next, the manufacturing method of the catheter 100 of this embodiment is demonstrated.
First, the outer layer 12 is extruded. A material containing resin constituting the outer layer 12 is extruded around a mandrel (core material) (not shown). At this time, in the outer layer 12, the gas is so formed that a long hollow portion (hole) along the longitudinal direction is formed at each position where the sub-lumen 80 is formed by the hollow tube 82 being embedded later. Extruding while discharging fluid such as.
After the extrusion molding, the hollow outer layer 12 can be formed by pulling out the mandrel.

On the other hand, the inner layer 11 is also prepared by extrusion molding. As in the case of forming the outer layer, a material containing a resin constituting the inner layer 11 may be extruded.
Thereafter, the coil 3 is placed around the inner layer 11.

  The hollow tube 82 is also formed by extruding a material containing a resin constituting the hollow tube 82. Extrusion molding is performed while discharging a fluid such as gas to the material of the hollow tube 82 so that a long hollow portion along the longitudinal direction is formed.

Thereafter, the outer layer 12 is covered around the coil 3 in a state where the coil 3 is covered around the inner layer 11.
Next, the hollow tube 82 is inserted into the hollow portion of the outer layer 12.
Thereafter, a heat shrinkable tube is placed around the outer layer 12. Next, the heat shrinkable tube is contracted by heating, and the outer layer 12, the coil 3, the inner layer 11, and the hollow tube 82 are pressurized from the outside in the radial direction of the inner layer 11. Further, the outer layer 12 is melted by the heating. The heating temperature is higher than the melting temperature of the outer layer 12 and lower than the melting temperature of the inner layer 11 and the hollow tube 82. By this heating, the outer layer 12 and the inner layer 11 are joined by welding. At this time, the material constituting the outer layer 12 encloses the coil 3, and the material constituting the outer layer 12 enters the recess 311 of the coil 3. Further, the outer layer 12 and the hollow tube 82 are joined by welding.

  Next, the heat shrinkable tube is removed from the outer layer 12 by cutting the heat shrinkable tube and tearing the heat shrinkable tube. Thereafter, the operation line 70 is inserted into the hollow tube 82.

Separately, a marker 4 that is an annular metal member is prepared.
Next, fixing of the tip of the operation line 70 to the marker 4 and caulking and fixing of the marker 4 to the periphery of the tip of the outer layer 12 are performed.

Next, the base end portion of the operation line 70 is connected to the separately created operation unit.
Next, the coat layer 50 is formed.
From the above, the catheter 100 can be obtained.

Next, the effect of this embodiment is demonstrated.
The winding 31 has a shape in which a cross section orthogonal to the longitudinal direction is formed with a recess 311 lacking a part of a circle. Since the winding 31 having such a shape is formed with a recess 311, the distribution of stress generated when winding is uneven compared to a conventional winding such as a round wire, and the winding 31 is concentrated at a specific location. Easier to plastic deformation. Therefore, the medical coil 3 wound with such a winding 31 is less likely to spring back and has a structure with excellent manufacturing stability. Furthermore, since spring back is less likely to occur, the treatment time for heat treatment to remove stress can be shortened compared to the conventional case, and the treatment itself can be made unnecessary. Coil 3 is formed.

  In the present embodiment, when the coil 3 is manufactured by plastic deformation of the winding 31, plastic deformation regions are formed at least at three or more locations in the cross section orthogonal to the longitudinal direction of the winding 31. Thereby, it can suppress reliably that a spring back will arise.

  Further, the recess 311 does not pass through the circular center of gravity G, but the depth direction vector of the recess 311 passes through the circular center of gravity G. Further, the depth d1 of the recess 311 is shorter than the distance l1 which is the thickness from the bottom of the recess 311 to the circular outer periphery, and the side surface 311a of the recess 311 in the cross section orthogonal to the longitudinal direction of the winding 31. Is parallel to the vector in the depth direction of the recess 311. By forming such a recess 311, in this embodiment, the pair of regions 312 facing each other across the recess 311 can be plastically deformed, and plastic deformation can be performed on the base end side of the pair of regions 312. Each region P can be formed. Thereby, it can suppress reliably that a springback arises by this.

  In the present embodiment, the winding 31 is wound around the core 83 so that the recess 311 of the winding 31 is located on the opposite side of the core 83. Thereby, it can be plastically deformed so that a pair of area | region 312 which opposes on both sides of the recessed part 311 may approach, and the winding 31 can be plastically deformed reliably.

  Furthermore, the winding wire 31 has a cross-sectional shape orthogonal to the longitudinal direction, in which a recess 311 is formed in a part of a circle. Although the recess 311 is formed, the cross-sectional shape of the winding 31 is very close to a circle. Therefore, when manufacturing a coil with such a winding, a coil manufacturing apparatus that conventionally used a round wire is used. Can be used.

  Further, in the catheter 100, the concave layer 311 of the coil 3 can be filled with the material constituting the outer layer 12, and the outer layer 12 is fitted into the coil 3, so that the coil 3 and the outer layer 12 are separated. Can be prevented.

  Furthermore, in the cross section orthogonal to the longitudinal direction of the winding 31, the depth d1 of the recess 311 is shorter than the distance l1 that is the thickness from the bottom of the recess 311 to the circular outer periphery. Therefore, it is possible to suppress a decrease in strength of the winding 31 due to the formation of the recess 311, and it is possible to suppress the generation of cracks in the winding 31.

(Second embodiment)
A second embodiment of the present invention will be described with reference to FIG.
FIG. 9 is a view showing a cross section orthogonal to the longitudinal direction of the winding 32, and FIG. 9A is a cross-sectional view of the winding 32 before the winding 32 is used as a coil. FIG. 9B is a cross-sectional view in a direction orthogonal to the longitudinal direction of the winding 32 after winding the winding 32 into the coil 3B. Although the cross-sectional shape of the winding wire 32 is different from that of the above-described embodiment, other points such as a coil manufacturing method are the same as those of the above-described embodiment.
As shown in FIG. 9A, the winding 32 has a cross-sectional shape in which a cross section orthogonal to the longitudinal direction is formed with a recess 321 lacking a part of a circle. The recess 321 extends along the longitudinal direction of the winding 31 and is formed over the entire longitudinal direction of the winding 32. The diameter of the winding 32 (the circular diameter) is, for example, 40 to 150 μm.
By forming the recess 321, the range of 1/36 to 1/20 of the circular circumference is cut. The recess 321 is recessed toward the center of gravity G of the circle, and the recess 321 passes through the center of gravity G of the circle and is formed beyond the center of gravity G. The vector in the depth direction of the recess 321 passes through the center of gravity G.
The depth d2 of the recess 321 is longer than the distance (thickness) 12 from the bottom of the recess 321 to the outer periphery of the winding 32. The depth d2 and the distance l2 are linear lengths that extend in the depth direction of the recess 321 through the center of the width of the recess 321 in the cross-sectional view of FIG. 9, and are defined in the same manner as in the above embodiment.
In this embodiment, the shape of the recessed part 321 is a rectangle, and the width | variety (length of the direction orthogonal to the depth direction of FIG. 9) of the recessed part 321 is equal over the whole depth direction of the recessed part 321.
The tip portions 322A of the pair of regions have an acute angle.
Further, as described above, in the present embodiment, the depth d2 is greater than the distance l2, and therefore the region W from the bottom of the recess 321 to the outer periphery of the winding 32 is a fragile region.
In addition, the shape of the recessed part 321 is not restricted to a rectangle, A triangle shape or a polygonal shape more than a pentagon may be sufficient.

Here, in the coil manufacturing apparatus 8, the winding wire 32 is wound around the bobbin 81. At this time, the winding wire 32 is elastically deformed, but is not plastically deformed.
The material and manufacturing method of the winding 32 are the same as those in the above embodiment.

  The winding wire 32 is sent out from the bobbin 81 and wound around the winding core 83. At this time, the winding wire 32 is wound around the core 83 so that the side on which the concave portion 321 is not formed is positioned on the core 83 side and the side on which the concave portion 321 is formed is positioned on the side opposite to the core 83.

By winding the winding wire 32 around the winding core 83 in this way, a force is applied to at least one of the pair of regions 322 sandwiching the concave portion 321 of the winding wire 31, and the winding wire 32 is plastically deformed.
Similar to the above embodiment, when the winding 32 is wound around the core 83, the outer region of the winding 32 opposite to the core 83 is pulled in the longitudinal direction of the winding 31. In other words, a pulling force acts on the outer region of the winding 32 in the direction perpendicular to the plane of FIG.
Further, when the winding 32 is wound around the core 83, the region on the core 83 side (inner region) of the winding 32 is compressed along the longitudinal direction of the winding 32.
However, as in the above-described embodiment, the midpoint between the inner region and the outer region of the winding 32 is a neutral region that is hardly pulled or compressed along the longitudinal direction of the winding 31. (See FIG. 9).

By winding the winding 32 around the winding core, the outer region of the winding 32 is pulled along the longitudinal direction of the winding 32. As a result, in the cross section orthogonal to the longitudinal direction of the winding 32, the outer region of the winding 32 contracts in a direction orthogonal to the longitudinal direction of the winding 32.
On the other hand, as described above, since the neutral region exists in the winding 32, the outer region of the winding 32 tends to approach the neutral region.
Further, when the winding 32 is wound around the core 83, the inner region of the winding 32 is compressed along the longitudinal direction of the winding 32. When the inner region of the winding 32 is compressed along the longitudinal direction of the winding 32, the inner region of the winding 32 swells in a direction perpendicular to the longitudinal direction of the winding 31 according to the Poisson's ratio. Become. With the above action, the pair of regions 322 are separated from each other, and the winding 32 is plastically deformed. In the present embodiment, since a fragile region called region W is formed, this region W becomes the plastic deformation region P. In the cross section orthogonal to the longitudinal direction of the winding 31, the recess 321 has a trapezoidal shape, and its width decreases from the opening side of the recess 311 toward the bottom.
As in the above-described embodiment, since the winding 32 has a neutral region, the inner region of the winding 32 also tends to approach the neutral region, and this action also forms a plastically deformed portion that is plastically deformed.
Using such a coil 3B, a catheter 100 similar to that of the above embodiment can be manufactured. In the catheter 100, the concave portion 321 is disposed on the side opposite to the inner layer 11, and the resin material of the outer layer 12 enters the concave portion 321.

In such a second embodiment, the same effects as the first embodiment can be obtained, and the following effects can be obtained.
The recess 321 is recessed toward the center of gravity G, and the recess 321 passes through the circular center of gravity G and is formed beyond the center of gravity G. By forming such a recess 321, the winding 32 can be easily plastically deformed.
In addition, since the pair of regions 322 of the concave portion 321 is plastically deformed so as to be separated from each other, the resin material constituting the outer layer 12 can easily enter the concave portion 321 and the coil 3B and the outer layer 12 are reliably separated. Can be suppressed.

(Third embodiment)
A third embodiment of the present invention will be described with reference to FIG.
FIG. 10 is a view showing a cross section orthogonal to the longitudinal direction of the winding 33, and FIG. 10A is a cross-sectional view of the winding 33 before the winding 33 is used as a coil. FIG. 10B is a cross-sectional view in a direction orthogonal to the longitudinal direction of the winding 33 after winding the winding 33 to form the coil 3C. Although the cross-sectional shape of the winding wire 32 is different from that of the above-described embodiment, other points such as a coil manufacturing method are the same as those of the above-described embodiment.
As shown in FIG. 10A, the winding 33 has a cross-sectional shape in which a cross section orthogonal to the longitudinal direction is formed with a recess 331 lacking a part of a circle. The recess 331 extends along the longitudinal direction of the winding 33 and is formed over the entire longitudinal direction of the winding 33. The diameter of the winding 33 (the circular diameter) is, for example, 40 to 150 μm.
By forming the recess 331, the range of 1/10 to 1/15 of the circular circumference is cut. In this embodiment, the recess 331 is recessed in a direction different from the center of gravity G of the circle, and the vector in the depth direction of the recess 331 passes through a position different from the center of gravity G.
The depth d3 of the recess 331 is longer than the distance (thickness) l3 from the bottom of the recess 331 to the outer periphery of the winding 33. The depth d3 and the distance l3 are linear lengths that pass through the center of the width of the recess 331 and extend in the depth direction of the recess 331 in the cross-sectional view of FIG.
Here, the definitions of the depth d3 and the distance l3 of the recess 331 are the same as the definitions of the depths d1 and d2 and the distances l2 and l1 in the above embodiment.
In the present embodiment, the concave portion 331 has a rectangular shape, and the width of the concave portion 331 (the length in the direction orthogonal to the depth direction in FIG. 3) is equal throughout the depth direction of the concave portion 331.
Of the pair of regions 332 (332a, 332b) facing each other with the recess 331 therebetween, the tip 332A of one region 332a has an acute angle.
Further, since the depth d3 of the recess 331 is longer than the thickness l3, a fragile region W is formed on the base end side of the region 332a. However, d3 may be smaller than l3.
In addition, the shape of the recessed part 321 is not restricted to a rectangle, A triangle shape or a polygonal shape more than a pentagon may be sufficient.

Here, in the coil manufacturing apparatus 8, the winding wire 33 is wound around the bobbin 81. At this time, the winding wire 33 is elastically deformed, but is not plastically deformed.
The material and manufacturing method of the winding wire 33 are the same as those in the above embodiments.

  The winding wire 33 is fed from the bobbin 81 and wound around the winding core 83. At this time, the winding wire 33 is wound around the core 83 so that the side on which the concave portion 331 is not formed is positioned on the core 83 side and the side on which the concave portion 331 is formed is positioned on the side opposite to the core 83.

Similar to the above-described embodiment, when the winding wire 33 is wound around the winding core 83, the outer region of the winding wire 33 on the side opposite to the winding core 83 is pulled in the longitudinal direction of the winding wire 33. In other words, a pulling force acts on the outer region of the winding 33 in the direction perpendicular to the plane of FIG.
Further, when the winding 33 is wound around the core 83, the inner region of the winding 33 is compressed along the longitudinal direction of the winding 33.
However, as in the above-described embodiment, the intermediate point between the inner region and the outer region of the winding 33 is a neutral region that is hardly pulled or compressed along the longitudinal direction of the winding 33. (See FIG. 10).

Since the outer region of the winding 33 is pulled along the longitudinal direction of the winding 33, the outer region of the winding 33 is orthogonal to the longitudinal direction of the winding 33 in a cross section orthogonal to the longitudinal direction of the winding 33. It will shrink in the direction to do.
In addition to this, as described above, since the winding 33 has a neutral region, the outer region of the winding 33 tends to approach the neutral region.
On the other hand, when winding the winding wire 33 around the core 83, the inner region of the winding wire 33 is compressed along the longitudinal direction of the winding wire 33. The inner region of the winding 33 is compressed along the longitudinal direction of the winding 33 so that the inner region of the winding 33 is in the longitudinal direction of the winding 33 in a cross section orthogonal to the longitudinal direction of the winding 33. It will bulge in the orthogonal direction according to the Poisson's ratio. By these actions, as shown in FIG. 10B, the region 332a is separated from the region 332b, and the winding 33 is plastically deformed. In the present embodiment, since a fragile region called region W is formed, this region W becomes the plastic deformation region P.
In the cross section orthogonal to the longitudinal direction of the winding wire 33, the recess 331 has a trapezoidal shape, and its width decreases from the opening side of the recess 331 toward the bottom side.
Similar to the above-described embodiment, the inner region of the winding 33 also tends to approach the neutral region, and a plastically deformed portion that is plastically deformed is formed by this action.
Using such a coil 3C, a catheter 100 similar to that of the above embodiment can be manufactured. In the catheter 100, the concave portion 331 is disposed on the side opposite to the inner layer 11, and the resin material of the outer layer 12 enters the concave portion 331.

In such a third embodiment, the same effects as those of the above embodiments can be obtained, and the following effects can be obtained.
The recess 331 is formed so that the vector in the depth direction does not pass through the center of gravity G of the circle. Further, the depth d3 of the recess 331 is greater than the wall thickness l3. By forming such a recess 331, the winding 33 can be easily plastically deformed.

(Fourth embodiment)
A fourth embodiment of the present invention will be described with reference to FIG.
FIG. 11 is a view showing a cross section orthogonal to the longitudinal direction of the winding 34, and FIG. 11A is a cross-sectional view of the winding 34 before the winding 34 is used as a coil. FIG. 11B is a cross-sectional view in a direction orthogonal to the longitudinal direction of the winding 34 after winding the winding 34 to form a coil 3D. Although the cross-sectional shape of the winding 34 is different from that of the above-described embodiment, other points such as a coil manufacturing method are the same as those of the above-described embodiments.
As shown in FIG. 11A, the winding 34 has a cross-sectional shape in which a cross section perpendicular to the longitudinal direction forms a convex portion with respect to a circular shape. That is, the winding 34 has a circular portion 341 and convex portions 342 (342a to 342d) protruding from the outer periphery of the circular portion 341 in a cross section orthogonal to the longitudinal direction.
In the present embodiment, a plurality of protrusions 342 (specifically four) are provided, and are arranged around the circular portion 341 at equal intervals. And in the cross section orthogonal to the longitudinal direction of the winding 34, the convex part 342 is arrange | positioned rotationally symmetrically centering | focusing on the gravity center G of the circular part 341. FIG.
Each protrusion 342 extends along the longitudinal direction of the winding 34 and is formed over the entire longitudinal direction of the winding 34.
In the cross section orthogonal to the longitudinal direction of the winding 34, the convex portion 342 has a triangular shape, and the tip thereof is formed at an acute angle. The height dimension of the protruding portion 342 in the protruding direction is not particularly limited. For example, in a cross section orthogonal to the longitudinal direction of the winding 34, a straight line L connecting the vertices of adjacent protruding portions 342 is a circle between the protruding portions 342. It is preferable to be located outward from the periphery of the portion 341. In this way, after the coil 3D is formed, when the coil 3D is embedded in the outer layer 12, a part of the outer layer 12 enters between the convex portions 342, and an anchor effect can be generated. In addition, the shape of the convex part 342 is not limited to a triangular cross section, and may be a rectangular shape.
The diameter of the circular portion 341 is, for example, 40 to 150 μm.

Here, in the coil manufacturing apparatus 8, the winding 34 is wound around the bobbin 81. At this time, the winding 34 is elastically deformed, but is not plastically deformed.
The material and manufacturing method of the winding 34 are the same as in the above embodiment.

The winding 34 is fed from the bobbin 81 and wound around the core 83. At this time, the winding 34 is wound around the core 83 so that the region between the pair of convex portions 342 contacts the core 83.
By winding the winding 34 around the winding core 83 in this way, a force is applied to the convex portion 342 of the winding 34 and the winding 34 is plastically deformed.
Similar to the above embodiment, when the winding 34 is wound around the core 83, the outer region of the winding 34 on the side opposite to the core 83 is pulled in the longitudinal direction of the winding 31. In other words, a pulling force acts on the outer region of the winding 34 in the direction perpendicular to the paper surface of FIG.
Further, when the winding 34 is wound around the core 83, a region (inner region) of the winding 32 on the core 83 side is compressed along the longitudinal direction of the winding 34.
However, an intermediate point between the inner region and the outer region of the winding 34 is a neutral region that is hardly pulled or compressed along the longitudinal direction of the winding 34 (FIG. 11A). reference).

Since the outer region of the winding 34 is pulled along the longitudinal direction of the winding 34, the outer region of the winding 34 is orthogonal to the longitudinal direction of the winding 34 in a cross section orthogonal to the longitudinal direction of the winding 34. It will shrink in the direction to do. In addition to this, the outer region of the winding 34 tends to approach the neutral region.
Thereby, the region 341A between the convex portions 342a and 342b is flattened and plastically deformed.
On the other hand, when winding the winding 34 around the core 83, the inner region of the winding 34 is compressed along the longitudinal direction of the winding 32. When the inner region of the winding 34 is compressed along the longitudinal direction of the winding 34, the inner region of the winding 34 swells in accordance with the Poisson's ratio in a direction perpendicular to the longitudinal direction of the winding 34. Become. Therefore, as shown in FIG. 11B, in the coil 3D, a region on the coil shaft side (particularly, a region 341B between the convex portions 342c and 342d) bulges toward the coil shaft side and undergoes plastic deformation.
By these actions, the convex portions 342a and 342b are deformed so as to be separated from each other, and plastic deformation regions are formed at the base end portions (regions on the circular portion 341 side) of the convex portions 342a and 342b, respectively. Further, although depending on the material of the winding 34 and the shape of the convex portion 342, for example, the convex portions 342c and 342d approach each other, and the base ends (regions on the circular portion 341 side) of the convex portions 342c and 342d are plastic. A deformation region may be formed, or the convex portions 342c and 342d may be separated from each other, and a plastic deformation region may be formed at the base end portion (region on the circular portion 341 side) of the convex portions 342c and 342d.
Using such a coil 3D, a catheter 100 similar to that of the above embodiment can be manufactured. In the catheter 100, each convex portion 342 bites into the outer layer 12.

In the fourth embodiment, the following effects can be achieved.
The winding 34 has a shape in which a convex portion 342 is formed in a circular cross section perpendicular to the longitudinal direction. Since the windings having such a shape are formed with the convex portions 342, the distribution of stress generated when winding is uneven, and it is easy to concentrate on a specific location and easily undergo plastic deformation. Therefore, the medical coil wound with such a winding 34 is less likely to spring back and has a structure with excellent manufacturing stability. Furthermore, since spring back is less likely to occur, the treatment time for heat treatment to remove stress can be shortened compared to the conventional case, and the treatment itself can be made unnecessary. It becomes a coil.

  In the present embodiment, when the coil 3D is manufactured by plastic deformation of the winding 34, at least four plastic deformation regions are formed in the cross section orthogonal to the longitudinal direction of the winding 34. Thereby, it can suppress reliably that a spring back will arise.

  Since the tip of the convex portion 342 of the winding 34 has an acute angle, the convex portion 342 bites into the outer layer, and the coil 3D and the outer layer 12 are difficult to separate. Furthermore, since the material which comprises the outer layer 12 enters between a pair of convex parts 342, an anchor effect arises and it becomes difficult to isolate | separate the outer layer 12 and the coil 3D.

The convex portions 342 are arranged at equal intervals, and the cross-sectional shape orthogonal to the longitudinal direction of the winding 34 is a rotationally symmetric shape. Therefore, any of the four regions between the convex portions 342 (the region between the convex portions 342a and 342b, the region between the convex portions 342b and 342c, the region between the convex portions 342c and 342d, and the region between the convex portions 342a and 342d) Even in the case of the winding core side, a similar coil can be obtained. When winding the winding, any one of the four regions described above may be on the winding core side, which facilitates the manufacture of the coil.
Furthermore, by making the cross-sectional shape of the winding rotationally symmetric about the center of gravity G, even when the winding is wound while twisting, the plasticity is almost the same as when winding without twisting. Deformation can occur. For example, the same plastic deformation can be caused when the region between the convex portions 342a and 342b is outside the coil and when the region between the convex portions 342d and 342b is outside the coil.

It should be noted that the present invention is not limited to the above-described embodiments, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.
For example, in the first to third embodiments, in the cross section orthogonal to the longitudinal direction of the winding, the recess is disposed toward the outer side opposite to the axis of the coil. It is also assumed that it is turned. Therefore, for example, a structure in which the concave portion is locally disposed on the axial side of the coil may be used. Moreover, you may wind a winding so that a recessed part may be arrange | positioned at the coil axis | shaft side.

  In the present invention, since the coil has a circular cross-sectional shape with a concave portion or a convex shape protruding from the circular shape, the coil can be created even if the windings constituting the coil are locally twisted. Easy to manufacture.

Furthermore, the cross-sectional shape in the longitudinal direction of the winding is not limited to the shapes of the first to fourth embodiments.
For example, a cross section perpendicular to the longitudinal direction of the winding before winding may be formed as shown in FIG. The winding 35 shown in FIG. 12 has a cross-sectional shape in which a cross section orthogonal to the longitudinal direction is formed with a recess 351 lacking a part of a circle. By forming the concave portion 351, a range of ¼ of the circular circumference is cut off. The concave portion 351 is recessed toward the center of gravity G of the circle, and the concave portion 351 is formed so as to pass through the circular center of gravity G. The recess 351 has a substantially triangular cross section. The winding 35 has a pair of regions 352 facing each other with the recess 351 in the cross section orthogonal to the longitudinal direction.
When winding such a winding 35 around the core 83, the side where the recess 351 is not formed is positioned on the core 83 side, and the side where the recess 351 is formed is positioned on the opposite side of the core 83. As described above, the winding 35 is wound around the core 83. The pair of regions 352 may be plastically deformed so as to be separated from each other, or may be plastically deformed so that the pair of regions 352 approach each other. Other configurations and effects are the same as those of the first embodiment.

Furthermore, it is good also considering the cross section orthogonal to the longitudinal direction of the winding before winding as a shape like FIG. The winding 36 shown in FIG. 13 has a cross-sectional shape in which a cross section orthogonal to the longitudinal direction is formed with a recess 361 lacking a part of a circle. In the cross section of the winding 36, a plurality of recesses 361 (361a to 361d) are formed, and here, four are formed. The recess 361 extends over the entire length of the winding. In the cross section orthogonal to the longitudinal direction of the winding, the recesses 361 are arranged rotationally symmetrically with the circular center of gravity G as the center. That is, the cross-sectional shape of the winding 36 is a rotationally symmetric shape with the center of gravity G as the center. By doing in this way, since any recessed part 361 of the some recessed part 361 is good also as a winding core side, a winding operation | work becomes easy.
In addition, by making the cross-sectional shape of the winding rotationally symmetric about the center of gravity G, even when the winding is wound while twisting, the plasticity is almost the same as when winding without twisting. Deformation can occur. For example, the same plastic deformation can be caused when the recess 361a of the recess 361 is outside the coil and when the recess 361d is outside the coil.
The recess 361 is recessed toward a position different from the center of gravity G of the circle, and the vector in the depth direction does not pass through the center of gravity G. The depth d6 of each recess 361 is larger than the thickness dimension l6 from the bottom of the recess 361 to the outer periphery of the winding 36 along the depth direction of the recess 361. However, d6 may be smaller than l6.
When such a winding 36 is wound around the core 83, a force acts on a pair of regions 362 facing each other across the recess 361 of the winding 36, so that the pair of regions 362 approach or separate from each other, and plasticity It will be deformed. Other configurations and effects are the same as those of the first embodiment.

Furthermore, the cross section orthogonal to the longitudinal direction of the winding before winding may be formed as shown in FIGS. The winding 37 shown in FIG. 14 and the winding 38 shown in FIG. 15 have a cross-sectional shape in which recesses 371 and 381 lacking a circular part are formed in a cross section orthogonal to the longitudinal direction. In the cross section of the windings 37, 38, a plurality of recesses 371, 381 are formed, and here, four are formed. The recesses 371 and 381 extend over the entire length of the winding. In the cross section orthogonal to the longitudinal direction of the winding, the recesses 371 and 381 are arranged rotationally symmetrically with the circular center of gravity G as the center. That is, the cross-sectional shape of the windings 37 and 38 is a rotationally symmetric shape with the center of gravity G as the center. By doing in this way, any recessed part 371 (or 381) is good also as a winding core side, Therefore A winding operation | work becomes easy.
In addition, by making the cross-sectional shape of the winding rotationally symmetric about the center of gravity G, even when the winding is wound while twisting, the plasticity is almost the same as when winding without twisting. Deformation can occur.
The recesses 371 and 381 are formed so that the vector in the depth direction passes through the center of gravity G, although it does not pass through the center of gravity G.
When such windings 37 and 38 are wound around the core 83, a force acts on a pair of regions facing each other with the recesses 371 and 381 in the longitudinal section of the windings 37 and 38. The areas of are separated or approached. Then, the base end side of each of the pair of regions is plastically deformed. Other configurations and effects are the same as those of the first embodiment.
In the cross section orthogonal to the longitudinal direction of the winding 37, the depth d7 of the recess 371 is smaller than the thickness dimension l7 from the bottom of the recess 371 along the depth direction of the recess 371 to the outer periphery of the winding. . However, d7 may be larger than l7. Further, the winding 37 is curved so that the bottom of the concave portion 371 is convex toward the outer peripheral side of the winding 37 in a circular arc shape in a cross section orthogonal to the longitudinal direction of the winding 37. Thereby, even if it forms a recessed part, it can suppress that a crack arises toward the gravity center from the bottom part of a recessed part.
Further, in the cross section orthogonal to the longitudinal direction of the winding 38, the depth d8 of the recess 381 is based on the thickness l8 from the bottom of the recess 381 to the outer periphery of the winding along the depth direction of the recess 381. Is also small. However, d8 may be larger than l8.
13 to 15, four recesses are formed. However, 4 × N (N is an integer of 2 or more) recesses are provided so as to be rotationally symmetric about the center of gravity G. It may be formed.

Furthermore, you may use the windings 39 and 40 shown to Fig.16 (a), (b). The windings 39 and 40 have a cross-sectional shape in which a cross section perpendicular to the longitudinal direction forms a convex portion with respect to a circular shape. That is, the windings 39 and 40 have circular portions 391 and 401 and convex portions 392 and 402 protruding from the outer periphery of the circular portions 391 and 401 in a cross section orthogonal to the longitudinal direction.
The convex portions 392 and 402 extend along the longitudinal direction of the windings 39 and 40 and are formed over the entire longitudinal direction of the windings 39 and 40.
In the cross section orthogonal to the longitudinal direction of the windings 39, 40, the convex portions 392, 402 have a triangular shape, and their tips are formed at an acute angle. Further, the maximum width of the convex portions 392 and 402 (the length perpendicular to the protruding direction of the convex portions 392 and 402 in the cross section in the direction orthogonal to the extending direction) is smaller than the diameter of the circular portions 391 and 401.

The windings 39 and 40 are sent out from the bobbin 81 and wound around the core 83. At this time, the windings 39 and 40 are wound around the core 83 so that the convex portions 392 and 402 are located on the opposite side of the core 83.
By winding the windings 39 and 40 around the winding core 83 in this way, a force is applied to the convex portions 392 and 402 of the winding 34, a plastic deformation region is formed, and the windings 39 and 40 are plastically deformed. Other points are the same as in the fourth embodiment.

Furthermore, in each said embodiment, although the medical device was used as the catheter, it is not restricted to this, For example, a guide wire and an endoscope may be sufficient.
In each of the above embodiments, the coil is a single-winding coil, but is not limited thereto, and may be a multi-winding coil. However, it is preferable that the coil is not a braided braided wire and is not a braided braided wire.
Furthermore, in each said embodiment, although the recessed part 311,321,331 or the convex part 342 was extended over the whole longitudinal direction of a winding, not only this but along the longitudinal direction of a winding, A plurality of concave portions or a plurality of convex portions may be formed intermittently.

DESCRIPTION OF SYMBOLS 3 Coil 3B Coil 3C Coil 3D Coil 4 Marker 8 Coil manufacturing apparatus 10 Tubular main body 11 Inner layer 12 Outer layer 15 Distal end part 16 Middle part 17 Proximal end part 20 Main lumen 31 Winding 32 Winding 33 Winding 34 Winding 35 Winding wire 36 Winding wire 37 Winding wire 38 Winding wire 39 Winding wire 40 Winding wire 50 Coat layer 60 Operation part 61 Shaft part 62 Handle part 63 Grasping part 64 Slider 64a Slider 64b Slider 70 Operation line 70a First operation line 70b Second operation Wire 71 Tip 71a Tip 71b Tip 80 Sublumen 80a Sublumen 80b Sublumen 81 Bobbin 86 Rotating body 82 Hollow tube 82a Hollow tube 82b Hollow tube 83 Core 84 Roller 85 Roller 100 Catheter 311 Recess 311a Side surface 312A Tip 312 Region 321 Recess 322 Region 3 22A tip 331 recess 332 region 332a region 332b region 332A tip 341 circular portion 341A region 341B region 342 convex portion 342a convex portion 342b convex portion 342c convex portion 342d convex portion 351 concave portion 352 region 361 concave portion 361a to 361d concave portion 362 381 Concave part 391 Circular part 401 Circular part 392 Convex part 402 Convex part W area

Claims (16)

A medical device coil used in a medical device,
The cross section orthogonal to the longitudinal direction has a shape in which a concave portion lacking a part of a circle is formed, or a wound wound in a shape in which a convex portion protruding from a circle is formed coil. The medical coil according to claim 1, wherein
A medical coil in which a plastic deformation portion is formed on the winding. The medical coil according to claim 1 or 2,
A medical coil in which the winding is wound so that the concave portion or the convex portion is located inside or outside the coil. The medical coil according to any one of claims 1 to 3,
The winding formed with the concave portion is wound,
A medical coil in which a vector in the depth direction of the recess passes through the circular center of gravity. The medical coil according to any one of claims 1 to 3,
The winding formed with the concave portion is wound,
A medical coil, wherein a vector in a depth direction of the concave portion passes through a position different from the circular center of gravity. The medical coil according to claim 4 or 5,
The medical winding is formed by winding the winding having a smaller thickness dimension from the bottom of the recess to the outer peripheral portion of the winding along the depth direction of the recess than the depth dimension of the recess. coil. The medical coil according to claim 4 or 5,
The medical winding is obtained by winding the winding having a larger thickness dimension from the bottom of the recess to the outer peripheral portion of the winding along the depth direction of the recess than the depth dimension of the recess. coil. The medical coil according to any one of claims 1 to 7,
The winding formed with the concave portion is wound,
A plastic deformation portion is formed on the winding,
In the cross section orthogonal to the longitudinal direction of the winding, the medical coil in which the plastic deformation portion is formed by the pair of regions sandwiching the recess approaching or separating. The medical coil according to any one of claims 1 to 3,
The medical coil which is formed by winding the winding having the convex part formed and the tip of the convex part having an acute angle. The medical coil according to any one of claims 1 to 9,
It is a winding of the winding formed with a plurality of the recesses or projections,
A medical coil obtained by winding the winding in which the plurality of concave portions or the convex portions are arranged rotationally symmetrically with respect to the center of the circle in a cross section perpendicular to the longitudinal direction of the winding.   A medical device comprising the medical coil according to claim 1. The medical device according to claim 11, wherein
The medical device is elongated,
The medical coil is arranged such that its axial direction is along the longitudinal direction of the medical device,
A medical device having a resin layer covering the medical coil. The medical device according to claim 12,
The medical coil is a coil obtained by winding the winding in which the concave portion according to any one of claims 1 to 8 or claim 10 is formed,
A medical device in which a part of the resin layer enters the recess. The medical device according to claim 12,
The medical coil is a coil obtained by winding the winding on which the convex portion according to any one of claims 1 to 3 or claim 9 or 10 is formed,
A medical device in which the convex portion of the winding of the medical coil bites into the resin layer. The medical device according to any one of claims 11 to 14,
The medical device is a medical device that is a catheter. The cross section perpendicular to the longitudinal direction is a cross-sectional shape in which a concave portion lacking a part of a circle is formed, or the first bending with respect to a winding having a cross-sectional shape in which a convex portion protruding from a circular shape is formed. Winding the bobbin by applying stress;
The winding is fed out from the bobbin, a second bending stress larger than the first bending stress is applied to the winding, and the winding is plastically deformed while the winding is made of the core. A method of manufacturing a medical coil including a step of winding around.

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