WO2022050403A1 - カテーテル - Google Patents
カテーテル Download PDFInfo
- Publication number
- WO2022050403A1 WO2022050403A1 PCT/JP2021/032574 JP2021032574W WO2022050403A1 WO 2022050403 A1 WO2022050403 A1 WO 2022050403A1 JP 2021032574 W JP2021032574 W JP 2021032574W WO 2022050403 A1 WO2022050403 A1 WO 2022050403A1
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- WIPO (PCT)
- Prior art keywords
- strands
- wire
- strand
- laser beam
- layer tube
- Prior art date
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- 0 C1*CCNC1 Chemical compound C1*CCNC1 0.000 description 1
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Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L29/00—Materials for catheters, medical tubing, cannulae, or endoscopes or for coating catheters
- A61L29/14—Materials characterised by their function or physical properties, e.g. lubricating compositions
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M25/00—Catheters; Hollow probes
- A61M25/0043—Catheters; Hollow probes characterised by structural features
- A61M25/005—Catheters; Hollow probes characterised by structural features with embedded materials for reinforcement, e.g. wires, coils, braids
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L29/00—Materials for catheters, medical tubing, cannulae, or endoscopes or for coating catheters
- A61L29/02—Inorganic materials
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L29/00—Materials for catheters, medical tubing, cannulae, or endoscopes or for coating catheters
- A61L29/04—Macromolecular materials
- A61L29/041—Macromolecular materials obtained by reactions only involving carbon-to-carbon unsaturated bonds
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M25/00—Catheters; Hollow probes
- A61M25/0009—Making of catheters or other medical or surgical tubes
- A61M25/0012—Making of catheters or other medical or surgical tubes with embedded structures, e.g. coils, braids, meshes, strands or radiopaque coils
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M25/00—Catheters; Hollow probes
- A61M25/0043—Catheters; Hollow probes characterised by structural features
- A61M25/0045—Catheters; Hollow probes characterised by structural features multi-layered, e.g. coated
Definitions
- the present invention relates to a catheter.
- Patent Document 1 discloses a catheter having a metal mesh made of a stainless steel (SUS) wire as a reinforcing structure.
- SUS stainless steel
- a laser beam is irradiated to the intersection of the first set of wires and the second set of wires of the metal mesh and welded.
- the metal mesh is irradiated with a laser beam along the cutting line, and the metal mesh is cut.
- This processing method makes it difficult to unravel the edges of the metal mesh.
- it is preferable that the first set of strands and the second set of strands are each melted at the contact portion to form an alloy in order to maintain the strength of the welded portion.
- a metal mesh consisting of multiple strands of different materials may be used.
- An example is given when a laser beam is applied to each of the strands of two types of materials having a large difference in melting point based on the above processing method.
- the laser beam is irradiated with the intensity required to melt the wire with a relatively high melting point (called the first wire) of the two wires, the melting point of the two wires is relatively high.
- the lower strands (referred to as the second strands) may melt and the second strands may melt.
- the first wire may not be melted. That is, in either case, since both the first wire and the second wire do not melt at the contact portion and do not alloy, there is a problem that the strength of the welded portion may not be maintained.
- An object of the present invention is to provide a catheter capable of making it difficult to unravel the end portion of a metal mesh even when a plurality of strands having different melting points are used.
- the catheter according to the first aspect of the present invention is a braid in which a plurality of first strands extending in the first direction and a plurality of second strands extending in the second direction intersecting the first direction are woven in a mesh pattern. It is composed of a body and includes at least a tubular reinforcing member extending in the stretching direction, and the melting point of the plurality of first strands is higher than the melting point of the plurality of second strands by 500 ° C. or more, and the stretching of the reinforcing member.
- a joint is formed at a part of a plurality of intersections where the plurality of first strands and the plurality of second strands intersect, and the junction is formed of the plurality of intersections.
- the plurality of first strands that partially intersect each other and the plurality of second strands, that is, the first crossed strands and the second crossed strands are joined to each other, and the first crossed strands and the second crossed strands are joined. It is characterized in that it is joined by alloying at each contact portion of the wire.
- alloying is performed at each contact portion between the first crossed wire and the second crossed wire, and the first crossed wire and the second crossed wire are joined to form a joint. Therefore, even when a braid composed of a plurality of first strands and a plurality of second strands having different melting points is used as the reinforcing member, the catheter can make it difficult to unravel the end portion of the reinforcing member in the extending direction.
- each of the plurality of first strands and the plurality of second strands has a curved portion curved with respect to the stretching direction. May be good.
- the catheter has a plurality of first strands and a plurality of second strands by alloying at the joint even when the plurality of first strands and the plurality of second strands are curved at the curved portion. Can be maintained in a state where each of them is joined to each other.
- the second tip portion of the second crossed strand on the tip side of the joint may be wound around the first crossed strand.
- the catheter can join the first crossed wire and the second crossed wire more firmly.
- the catheter has a tubular shape centered on the central axis of the reinforcing member, has an inner layer tube arranged in the lumen of the reinforcing member, and has a tubular shape centered on the central axis.
- An outer layer tube that covers the member from the outside may be provided.
- the inner layer tube can prevent the wire from being caught by the reinforcing member when the wire or the like passes through the lumen of the reinforcing member. Further, the outer layer tube can suppress the exposure of the reinforcing member. Therefore, the catheter can reduce the possibility that the reinforcing member is caught in the blood vessel as the catheter passes through the blood vessel.
- the light transmittance of the inner layer tube may be higher than the light transmittance of the outer layer tube.
- the material of the inner layer tube may be polytetrafluoroethylene.
- an inner layer tube having a high transmittance can be easily realized.
- the first crossed wire may be arranged on one side of the first direction and the third direction orthogonal to the second direction with respect to the second crossed wire.
- the first crossed strand and the second crossed strand can be easily joined by irradiating the laser beam from one side in the third direction.
- the joint portion is formed by irradiating the laser beam, more energy of the laser beam can be given to the first elemental wire having a high melting point, and the first elemental wire can be melted.
- the cross-sectional shape of one of the plurality of first strands and the plurality of second strands is circular, and the other of the plurality of first strands and the plurality of second strands.
- the cross-sectional shape may be rectangular.
- the cross-sectional shape of the plurality of first strands may be circular, and the cross-sectional shape of the plurality of second strands may be rectangular.
- the catheter can easily realize a step of alloying at the contact portions of the first crossed wire and the second crossed wire to form a joint.
- the plurality of first strands may have a larger absorption coefficient than the plurality of second strands. In this case, even when the first and second strands are joined by one irradiation of the laser beam, the first and second strands are appropriately melted and alloyed to form an alloy, respectively. Can be joined.
- the composition of the portion of the second crossed wire excluding the joint portion may be the same regardless of the distance from the joint portion. In this case, since the catheter can stably maintain the composition of the second wire, the strength of the braid can be maintained.
- the material of the plurality of first wires may be tungsten, and the material of the plurality of second wires may be stainless steel.
- the catheter can achieve good pushability by the braid. Further, since tungsten has an excellent radiation shielding ability, the position of the catheter in the body can be easily confirmed by irradiation.
- a plurality of first strands extending in the first direction and a plurality of second strands extending in the second direction intersecting the first direction are woven in a mesh pattern. It consists of a braided braid and at least has a tubular reinforcing member that extends in the stretching direction.
- the melting point of the plurality of first strands is 500 ° C. or higher higher than the melting point of the plurality of second strands.
- a joint is formed at a joint intersection that is a part of a plurality of intersections where the plurality of first strands and the plurality of second strands intersect.
- the joint is Of the plurality of intersections, the first strands [n] and the second strands [n] that intersect each other at the junction intersection [n] are joined by alloying at their respective contact portions.
- the first wire [n] is arranged on one side of the first direction and the third direction orthogonal to the second direction with respect to the second wire [n]. It is a manufacturing method for manufacturing a catheter characterized by the above.
- the junction region [n] where the first strand [n] and the second strand [n] overlap in a state where the braid is viewed from one side in the third direction.
- first irradiation region [n] including at least a part of one side of the second direction and a portion of the second wire [n] that does not overlap with the first wire [n].
- the second irradiation region [n] separated from the junction intersection point [n] of the first strands [n] on one side in the first direction is characterized by comprising a second irradiation step of cutting the first wire [n] at the position of the second irradiation region [n] by irradiating the laser beam from one side of the third direction.
- the laser beam irradiated in the first irradiation step first heats a part of the first wire [n] to melt it, and then heats the second wire [n] to melt and melt it at the same time.
- the molten first wire [n] and the second wire "n" are alloyed and joined.
- the laser beam irradiated in the second irradiation step heats the first wire [n] and blows it. As a result, at least one of the stretching directions of the reinforcing member becomes difficult to unravel due to the joint portion.
- the first strand [n] and the second strand [n] are joined by alloying and the second strand [n].
- the energy of the laser beam is first donated to the first wire [n], and the remaining energy is donated to the second wire [n]. Therefore, even when the melting point of the first wire is 500 ° C. or higher higher than the melting point of the second wire, the joining of the first wire [n] and the second wire [n] and the first wire [n] are performed. ] Can be efficiently performed by irradiating with a single laser beam.
- At least one of the first irradiation step and the second irradiation step is The energy supplied to the braid by irradiation with laser light may be changed over time to irradiate.
- the first and second strands are in the vicinity of the laser beam irradiation region. It is possible to prevent the occurrence of dissolution, evaporation, and disappearance of the laser.
- At least one of the first irradiation step and the second irradiation step is The pre-irradiation process of irradiating a laser beam with relatively low intensity, After the pre-irradiation step, a post-irradiation step of irradiating a laser beam having a relatively high intensity may be provided.
- At least one of the first irradiation step and the second irradiation step is The laser beam may be intermittently irradiated a plurality of times.
- the first strand [n + 1] is arranged on one side of the third direction with respect to the second strand [n].
- a second wire [n + 1] adjacent to the other side of the first wire with respect to the second wire [n] intersects with the first wire [n].
- the second strand [n + 1] may be arranged on one side of the third direction with respect to the first strand [n].
- the catheter indicates that the first wire [n] moves to one side in the third direction when the first wire [n] and the second wire [n] are joined at the junction intersection [n]. , Can be suppressed by the second strand [n + 1]. Further, in the catheter, when the first wire [n] and the second wire [n] are joined at the junction intersection [n], the second wire [n] moves to one side in the third direction. This can be suppressed by the first strand [n + 1].
- the braid is formed at the junction intersection [n + 1] where the first strand [n + 1] and the second strand [n + 1] intersect.
- the laser beam is irradiated from one side of the third direction to the first irradiation region [n + 1] including at least the portion of the second wire [n + 1] that does not overlap with the first wire [n + 1].
- a fourth irradiation step of cutting the first wire [n + 1] at the position of the second irradiation region [n + 1] by irradiating the laser beam from one side of the third direction may be provided.
- first strand [n + 1] and the second strand [n + 1] can be joined and fused.
- junction intersection [n] and the junction intersection [n + 1] may be arranged side by side in the stretching direction.
- the reinforcing member can be cut in the direction orthogonal to the stretching direction.
- the reinforcing member in the first irradiation step and the second irradiation step, may be irradiated with laser light in a state where the inert gas in a laminar flow state is sprayed.
- a pre-step of arranging a cylindrical inner layer tube around the columnar metal wire extending in the stretching direction and arranging the metal wire and the inner layer tube in the lumen of the reinforcing member is provided.
- the braided body of the reinforcing member prepared in the previous step is irradiated with laser light, and the laser beam is irradiated.
- a post-step of arranging a cylindrical outer layer tube around the reinforcing member may be further provided.
- a catheter provided with a reinforcing member, an inner layer tube, and an outer layer tube can be manufactured.
- a catheter provided with a thin inner layer tube can be easily manufactured.
- the metal wire it is possible to prevent the laser beam irradiated to the reinforcing member from passing through the lumen of the reinforcing member and reaching the opposite side, so that the reinforcing member on the opposite side is melted by the laser beam. The possibility can be reduced.
- the light transmittance of the inner layer tube may be higher than the light transmittance of the outer layer tube.
- the thermal conductivity of the metal wire may be 350 to 450 w / mK.
- FIG. 1 It is a figure which shows the catheter 1 and the connector 9. It is a figure which shows the catheter 1. It is a figure which shows the reinforcing member 2 in the expanded state. It is an enlarged perspective view of a part of the reinforcing member 2 in the expanded state. It is a figure which shows the vicinity of the tip portion of the reinforcing member 2 in the expanded state. It is an enlarged perspective view of a part of FIG. It is a photograph of the joint portion 5 of the reinforcing member 2. It is a photograph which took the cross section of the joint part 5 [x]. It is a schematic diagram which shows the cross section of the joint part which was joined by the conventional method. It is a flowchart which shows the manufacturing method of a catheter 1.
- FIG. 1 It is a figure which shows the reinforcing member 2 in the expanded state. It is an enlarged perspective view of a part of the reinforcing member 2 in the expanded state. It is a figure which shows the vicinity of the tip portion of the reinforcing member
- the catheter 1 has a reinforcing member 2, an inner layer tube 6, and an outer layer tube 7.
- extending direction The end corresponding to one of both ends of the catheter 1 in the extending direction is referred to as "tip 1D”.
- base end 1P The ends corresponding to the other side of both ends of the catheter 1 in the extending direction are referred to as "base end 1P”.
- the catheter 1 has a lumen 6L for passing a wire or the like inside. The lumen 6L extends in the stretching direction between the distal end 1D and the proximal end 1P of the catheter 1.
- the connector 9 for passing a wire or the like through the catheter 1 is connected to the proximal end portion 1P of the catheter 1.
- the reinforcing tube 90 reinforces the vicinity of the connection portion between the proximal end portion 1P of the catheter 1 and the connector 9.
- the radial direction with respect to the line segment (referred to as "center line C") passing through the center of the cross section of the catheter 1 in the plane orthogonal to the stretching direction is referred to as the third direction.
- the side close to the center line C of the catheter 1 is referred to as "inside”
- the side separated from the center line C of the catheter 1 is referred to as "outside”.
- the reinforcing member 2 is a flexible tubular member.
- the reinforcing member 2 reinforces the strength of the catheter 1 in the extending direction.
- the reinforcing member 2 extends from the distal end portion 1D of the catheter 1 to the proximal end portion 1P along the extending direction.
- the reinforcing member 2 is formed by forming a braided body 20 (see FIG. 3) in which a plurality of metal strands are woven into a cylindrical shape and cutting both ends thereof.
- the center line C extends in the stretching direction through the center of the braided body 20.
- FIGS. 3 and 4 show a state in which a part of the braided body 20 is unfolded.
- the braided body 20 has a plurality of first strands 30 and a plurality of second strands 40.
- the plurality of first strands 30 extend along the first direction intersecting the stretching direction.
- the plurality of second strands 40 extend along the extending direction and the second direction intersecting the first direction.
- the braided body 20 is a wire mesh in which a plurality of first strands 30 and a plurality of second strands 40 are woven into a mesh by passing over two of each other, a so-called twill wire mesh.
- the first direction and the direction orthogonal to the second direction correspond to the third direction.
- the third direction is orthogonal to the stretching direction.
- the front side of FIG. 3 corresponds to the outside in the third direction.
- the back side of FIG. 3 corresponds to the inside of the third direction.
- each of the plurality of first strands 30 is ... 1st strand 3 [n-1], 1st strand 3 [n], 1st strand 3 [n + 1]. ⁇ ⁇ These are collectively called the first strand 3.
- Each of the plurality of second strands 40 is referred to as a second strand 4 [n-1], a second strand 4 [n], a second strand 4 [n + 1], and these are referred to as.
- a plurality of positions where a plurality of first strands 30 and a plurality of second strands 40 intersect are referred to as a plurality of intersections Q. In FIG. 3, among the plurality of intersections Q, only the intersection Q where the first strand 3 [n + 2] and the second strand 4 [n + 4] intersect is coded, and the symbols of the other plurality of intersections Q are omitted. Has been done.
- the first strand 3 is relative to the second strand 4. It is arranged on the outside of the third direction (front side in FIG. 3).
- the material of the first wire 3 is tungsten (W), and the melting point is 3422 ° C.
- the cross-sectional shape of the first strand 3 is a perfect circle (see FIG. 4).
- the absorption coefficient of the first strand 3 is 0.4 or more.
- the material of the second wire 4 is stainless steel (SUS304), and the melting point is 1450 ° C.
- the cross-sectional shape of the second strand 4 is rectangular (see FIG. 4).
- the absorption coefficient of the second strand 4 is about 0.3.
- the difference in melting point between the first wire 3 and the second wire 4 is about 2000 ° C.
- the melting point of the first wire 3 is at least 500 ° C. higher than the melting point of the second wire 4.
- the extinction coefficient of the first strand 3 is larger than the extinction coefficient of the second strand 4.
- a black black wire is used as the first wire 3 so that the absorption coefficient of the first wire 3 is larger than the absorption coefficient of the second wire 4.
- tip portion 2D of the reinforcing member 2 and the end portion on the proximal end side (hereinafter referred to as “base end portion 2P of the reinforcing member 2” (FIG. 1). Refer to). ”) are formed by cutting the braided body 20 by irradiation with a laser beam, respectively. Further, in the tip portion 2D and the base end portion 2P, a plurality of first strands 30 and a plurality of first strands 30 and a plurality of the cut braided bodies 20 so that the plurality of first strands 30 and the plurality of second strands 40 cannot be unraveled. A plurality of joints 50 (see FIG. 5) are formed at a part of the plurality of intersections Q with the second strand 40 of the above.
- the side of both sides in the first direction that is close to the tip portion 2D (see FIG. 1) is referred to as the "first tip end side”, and is referred to as the base end portion 2P (see FIG. 1).
- the side close to each other is called the “first base end portion”.
- the side close to the tip 2D (see FIG. 1) is called the “second tip side”
- the side close to the base 2P (see FIG. 1) is called the "second base end”.
- FIG. 5 is an enlarged view of a part of the tip portion 2D of the reinforcing member 2.
- Each of the plurality of joint portions 50 is referred to as a joint portion 5 [n], a joint portion 5 [n + 1], and the like, and these are collectively referred to as a joint portion 5.
- the intersections at which the junction 5 is formed are referred to as ... junction intersection Qc [n], junction intersection Qc [n + 1] ...
- the junction 5 [x] (x is any of n, n + 1, n + 2, n + 3, n + 4, n + 5) is the junction intersection Qc [x] between the first strand 3 [x] and the second strand 4 [x]. x] is formed.
- the joint portion 5 [x] is formed by alloying the first strand 3 [x] and the second strand 4 [x] at the contact portion at the junction intersection Qc [x] to form the first strand 3 [x]. ] And the second strand 4 [x] are joined. Specifically, the alloy at the joint portion 5 [x] is in a state of satisfying the following conditions. (1) The first strand 3 [x] and the second strand 4 [x] are melted by irradiation with a laser beam. (2) The respective components of the first strand 3 [x] and the second strand 4 [x] are mixed and diffused, and then melt-solidified. (3) The entire interface between the first wire 3 [x] and the second wire 4 [x] is not covered with a layer of an intermetallic compound.
- the first strand 3 [x] is arranged outside the third direction (front side in FIG. 5) with respect to the second strand [x].
- the portion of the second strand 4 [x] on the second tip side in the second direction from the junction intersection Qc [x] is outside the third direction (FIG. 6, FIG. 7). It is curved toward the front side in FIG. 7) and is wound around the first strand 3 [x].
- the end portion of the first strand 3 [x] on the first tip side in the first direction is separated from the junction intersection Qc [x]. That is, the first strand 3 [x] slightly extends from the junction intersection Qc [x] to the first tip side in the first direction.
- the distance in the first direction between the end of the first strand 3 [x] on the first tip side and the junction intersection Qc [x] is any value in the range of 0.03 mm to 0.15 mm. ..
- FIG. 8 is a cross-sectional view showing a state in which the first strand 3 [x] and the second strand 4 [x] are joined by the joint portion 5 [x] at the junction intersection Qc [x].
- FIG. 8 it was confirmed that the first strand 3 [x] and the second strand 4 [x] were mixed and recrystallized by the formed solid solution at each interface.
- FIG. 9 shows. As described above, the first strand and the second strand are separated by the intermetallic compound layer formed at the interface between the first strand and the second strand. From this result, it was confirmed that the joint portion 5 [x] can bond the first wire 3 [x] and the second wire 4 [x] more firmly than in the conventional case.
- the inner layer tube 6 has a cylindrical shape centered on the center line C, and is arranged in the lumen 2L of the reinforcing member 2.
- the material of the inner layer tube 6 is polytetrafluoroethylene (PTFE).
- the light transmittance of the inner layer tube 6 is 90% or more.
- the lumen 6L of the inner layer tube 6 extends in the stretching direction to form the lumen 6L of the catheter 1.
- the inner layer tube 6 is provided to separate the lumen 6L of the catheter 1 from the reinforcing member 2, and prevents wires and the like passing through the lumen 6L from being caught on the reinforcing member 2.
- the outer layer tube 7 has a cylindrical shape centered on the center line C and covers the reinforcing member 2 from the outside.
- the material of the outer layer tube 7 is a colored resin material containing a pigment.
- the light transmittance of the outer layer tube 7 is less than 90%.
- the light transmittance of the outer layer tube 7 is more preferably 10% to 20%.
- the light transmittance of the inner layer tube 6 is higher than the light transmittance of the outer layer tube 7.
- the outer layer tube 7 has a first outer layer tube 71, a second outer layer tube 72, a third outer layer tube 73, and a fourth outer layer tube 74, each having different rigidity.
- the first outer layer tube 71, the second outer layer tube 72, the third outer layer tube 73, and the fourth outer layer tube 74 are arranged in the stretching direction, and are arranged in this order from the tip portion 1D to the proximal end portion 1P of the catheter 1. ..
- the rigidity of the outer layer tube 7 gradually increases in the order of the first outer layer tube 71, the second outer layer tube 72, the third outer layer tube 73, and the fourth outer layer tube 74.
- the soft tip 8 is provided on the tip 1D of the catheter 1.
- the soft tip 8 comes into contact with each of the vicinity of the end portion on the distal end side of the side surface of the inner layer tube 6 and the vicinity of the distal end portion 2D of the reinforcing member 2.
- the soft tip 8 is fixed by being welded to the inner layer tube 6 and the reinforcing member 2, and terminates the tip portion 1D of the catheter 1.
- a curved portion 2R is provided in the vicinity of the tip portion 1D of the catheter 1.
- the curved portion 2R is formed by bending each of the reinforcing member 2, the inner layer tube 6, and the outer layer tube 7 in the stretching direction.
- the catheter 1 is manufactured by joining and fusing both ends of the reinforcing member 2 in the extending direction by irradiation with a laser beam to form the tip portion 2D and the proximal end portion 2P. It is premised that the tip of the reinforcing member 2 is first cut by irradiation with laser light to form the tip 2D, and then the base end of the reinforcing member 2 is cut by irradiation with laser light to form the base end 2P. And.
- the previous process is executed (S11).
- the metal wire 100, the inner layer tube 6, and the reinforcing member 2 are prepared. The details are as follows.
- the long wire rod 10 wound around the bobbin is pulled out. As shown in FIG. 11, the required length of the drawn long wire rod 10 is roughly cut by scissors or the like.
- the long wire 10 has a configuration in which the inner layer tube 6 arranged around the columnar metal wire 100 is arranged in the lumen 2L of the reinforcing member 2.
- the inner layer tube 6 and the metal wire 100 arranged in the lumen 2L of the reinforcing member 2 are visualized and shown.
- the metal wire 100 is annealed copper.
- the thermal conductivity of the metal wire 100 is 350 to 450 w / mK.
- the metal wire 100 can suppress a local temperature rise when it is irradiated with a laser beam in the manufacturing process by heat diffusion.
- the surface of the metal wire 100 is plated in silver to reflect the laser beam irradiated in the manufacturing process.
- the inner layer tube 6 is resin-molded as a film on the surface of the metal wire 100.
- the light transmittance of the inner layer tube 6 is 90% or more, and the laser light irradiated in the manufacturing process is transmitted.
- the reinforcing member 2 is arranged on the outside of the inner layer tube 6 and exposed. Further, in the previous step, in order to remove machine oil and the like adhering to the plurality of first strands 30 and the plurality of second strands 40 (see FIG. 3) during the manufacture of the reinforcing member 2, the long wire rod 10 is used. Degreasing is performed with an organic solvent.
- the first wire 3 and the second wire 4 are joined at the joint portion 5 at the tip of the long wire rod 10, and the second wire is joined in the vicinity of the joint portion 5.
- the irradiation area of the laser beam is determined.
- the light source of the laser beam is positioned so that the determined irradiation region is irradiated with the laser beam (S13).
- joint portions 5 [x] corresponding to each when x is changed in the order of n, n + 1, n + 2, n + 3, ... Are formed in order, and the tip portion 2D is formed. It is assumed that.
- the first strand 3 [n] and the second strand [n] are joined by the junction 5 [n], and A case where the second strand 4 [n] is cut will be described.
- the first strand 3 [n] is arranged outside the second strand 4 [n] in the third direction.
- the first strand 3 [n + 1] is arranged outside the second strand 4 [n] in the third direction.
- the second strand 4 [n + 1] is arranged outside the first strand 3 [n] in the third direction.
- the irradiation area of the laser beam positioned by S13 is referred to as a first irradiation area 51 [n].
- the first irradiation region 51 [n] is specifically defined as the following region. As shown in FIG. 13, at the junction intersection Qc [n], the first strand 3 [n] and the second strand 4 [n] overlap with each other when the braided body 20 is viewed from the outside in the third direction.
- a junction region 53 [n] is defined.
- the first irradiation region 51 [n] is a part 511 on the second tip side in the second direction of the junction region 53 [n] and the junction region 53 [n] of the second strand 4 [n]. It includes at least a portion 512 which is a portion on the second tip side and does not overlap with the first strand 3 [n].
- the positioning of the light source of the laser beam is performed by using an image system.
- the imaging system can display the center and periphery of the optical path of the laser beam, which is determined according to the position of the light source.
- the circular diameter (spot diameter of the laser beam) drawn by the peripheral edge of the optical path of the laser beam is set to be equal to or less than the diameter of the first strand 3 or the width of the second strand 4.
- the laminar-flowed inert gas is sprayed toward the vicinity of the first irradiation region 51 [n] (see FIG. 13) of the braided body 20. It is started (S15). Specifically, the inert gas is argon gas or helium gas. Next, the laser beam is output from the light source in a state where the inert gas is blown. As a result, the laser beam is irradiated to the first irradiation region 51 [n] from the outside in the third direction (S17).
- the laser light is first irradiated to the first strand 3 [n] as shown in FIG. 14A.
- the energy of the laser beam is donated to the first wire 3 [n]
- the first wire 3 [n] is heated and melted.
- the energy of the laser beam is reduced by being donated to the first strand 3 [n].
- the laser beam is then applied to the second strand 4 [n].
- the energy of the laser beam is donated to the second wire 4 [n], and the second wire 4 [n] is heated to melt and melt.
- FIG. 14A As a result, the energy of the laser beam is donated to the first wire 3 [n], and the first wire 3 [n] is heated and melted.
- the first strand 3 [n] and the second strand 4 [n] are in contact with each other and alloyed and joined. Further, the second strand 4 [n] is fused at the portion on the second tip side in the second direction from the joint portion 5 [n], and is curved outward in the third direction to form the first strand 3 [n]. ] (See FIGS. 6 and 7). After the first strand [n] and the second strand [n] are joined by the junction intersection Qc [n], the irradiation of the laser beam from the light source is stopped.
- the junction intersection Qc [n] is reached.
- the first wire 3 and the second wire 4 may generate heat due to the irradiation of the laser beam.
- the physical characteristics of the first wire 3 and the second wire 4 may change due to heat or fusing may occur in a region different from the junction intersection Qc [n], which is not preferable.
- the energy supplied to the braided body 20 by the irradiation of the laser beam is changed with time and irradiated. This reduces the possibility that the first strand 3 and the second strand 4 generate heat due to the irradiation of the laser beam at a position different from the junction intersection Qc [n]. The details are as follows.
- the laser beam for one pulse is divided and intermittently irradiated a plurality of times. More specifically, the laser beam has a relatively high intensity period (hereinafter referred to as "high level period”) and a relatively low intensity period (hereinafter referred to as “low level period”). Irradiation is performed while switching alternately and repeatedly. In this case, the heat generated by the energy of the laser beam in the first wire 3 or the second wire 4 of the braid 20 is difficult to diffuse to the surroundings. The reason is that the heat cools during a low level period when the intensity of the irradiated laser beam is relatively small, and diffusion to the surroundings is suppressed. This effect is generally called the pulse division effect (Cool effect). In this case, as shown in FIG. 15B, it is possible to suppress the diffusion of heat to the surroundings (arrow Y1) by continuously irradiating the laser beam for one pulse with a constant intensity.
- high level period a relatively high intensity period
- low level period relatively low intensity period
- the intensity and irradiation time of the laser beam are adjusted so that the energy required for fusing the first strand 3 can be supplied by the energy of one pulse.
- the intensity of the laser beam in the low level period may be half or less of the intensity of the laser beam in the high level period. That is, the intensity of the laser beam in the low level period may be any value of 0% to 50% of the intensity of the laser beam in the high level period. Further, when the intensity of the laser beam in the low level period is set to 0, the irradiation of the laser beam is stopped in the low level period. Further, the time of the low level period is set to a value of any one of 10% to 100% with respect to the time of the high level period.
- the blowing of the inert gas started in S15 is stopped (S19).
- the irradiation region of the laser beam to be irradiated for cutting the first strand 3 [n] in the vicinity of the joint portion 5 [n] is determined.
- the first strands 3 [n] shown in FIG. 5 the first strands 3 [n] are fused at a position separated from the junction intersection Qc [n] toward the first tip in the first direction. Will be done.
- the light source of the laser beam is positioned so that the determined irradiation area is irradiated with the laser beam (S21).
- the irradiation region of the laser beam positioned by S21 is referred to as a second irradiation region 52 [n].
- the blowing of the inert gas in the laminar flow state toward the vicinity of the second irradiation region 52 [n] of the braided body 20 is started (S23).
- the laser beam is output from the light source in a state where the inert gas is blown.
- the laser beam is irradiated to the second irradiation region 52 [n] from the outside in the third direction (S25).
- the laser beam when the laser beam is irradiated in S25, the laser beam provides energy to the second irradiation region 52 [n] of the first strand 3 [n].
- the first strand 3 [n] is fused on the first tip side in the first direction with respect to the joint portion 5 [n]. After the first strand [n] is blown off, the irradiation of the laser beam from the light source is stopped.
- the irradiation conditions of the laser light irradiated to the second irradiation region 52 [n] in S23 are the same as the irradiation conditions of the laser light irradiated to the first irradiation region 51 [n] in S17. That is, the laser beam for one pulse is divided and intermittently irradiated a plurality of times. Therefore, the heat generated by the energy of the laser beam in the first strand 3 [n] is difficult to diffuse to the surroundings. Therefore, as shown in FIG.
- the fusing portion 301 of the first strand 3 [n] that has been blown by the irradiation of the laser beam does not move after the irradiation of the laser beam is stopped, and immediately after the irradiation of the laser beam. Maintained in position. Therefore, for example, as shown in FIG. 17B, when the laser beam for one pulse is continuously irradiated with a constant intensity, the heat is diffused to the surroundings, and the fusing portion 301 of the first strand 3 [n] is formed. It is possible to suppress the movement toward the joint portion 5 [n] (arrow Y2).
- the state in which the fusing portion 301 of the first wire 3 [n] and the second wire 4 [n] are separated from each other is maintained, and the heat of the fusing portion 301 of the first wire 3 [n] is generated. It is not transmitted to the second strand 4 [n]. Therefore, even when the second irradiation region 52 [n] is irradiated with the laser beam, the composition of the second strand 4 [n] does not change except for the joint portion 5 [n]. In other words, the composition of the second strand 4 [n] is the same regardless of the distance from the junction 5 [n], except for the junction 5 [n].
- the first strands 3 [n + 1] are blown at a position separated from the junction intersection Qc [n + 1] toward the first tip side in the first direction (S21). ⁇ S27). At this time, the joint portions 5 [n] and 5 [n + 1] are arranged in the stretching direction.
- the above process is repeatedly executed while x is updated in the order of n + 2 and n + 3.
- the first strand 3 [n + 2] and the second strand 4 [n + 2] are joined by the junction 5 [n + 1], and the second strand 4 [n + 2] is joined.
- the strand 4 [n + 2] is cut (S13 to S19). Further, of the first strands 3 [n + 2], the first strands 3 [n + 2] are blown at a position separated from the junction intersection Qc [n + 2] toward the first tip side in the first direction (S21). ⁇ S27).
- the first strand 3 [n + 3] and the second strand 4 [n + 3] are joined by the junction 5 [n + 3], and the second strand 4 [n + 3] is cut. (S13 to S19). Further, of the first strands 3 [n + 3], the first strands 3 [n + 3] are blown at a position separated from the junction intersection Qc [n + 3] toward the first tip side in the first direction (S21). ⁇ S27). At this time, the joint portions 5 [n + 2] and 5 [n + 3] are arranged in the stretching direction.
- the same process as above is repeatedly executed while x is updated in the order of n + 4 and n + 5.
- the joint portion 5 [n + 4] and the joint portion 5 [n + 5] shown in FIG. 5 are formed.
- the joint portions 5 [n + 4] and 5 [n + 5] are arranged in the stretching direction.
- the joint portions 5 [n], 5 [n + 2], 5 [n + 4], and the joint portions 5 [n + 1], 5 [n + 3], and 5 [n + 5] are arranged in the direction orthogonal to the stretching direction, respectively. ..
- the reinforcing member 2 is cut at the tip in a direction orthogonal to the stretching direction, and the tip portion 2D is formed.
- a post-process of arranging the outer layer tube 7 around the reinforcing member 2 is executed (S33).
- the metal wire 100, the inner layer tube 6, and the reinforcement are provided for the lumen 74L of the fourth outer layer tube 74, the lumen 73L of the third outer layer tube 73, and the lumen 72L of the second outer layer tube 72.
- the members 2 are inserted in order.
- the metal wire 100, the inner layer tube 6, and the reinforcing member 2 are also inserted into the lumen of the first outer layer tube 71.
- the outer layer tube 7 has a first outer layer tube 71 (see FIG.
- the fourth outer layer tube 74 is arranged in this order.
- the soft tip 8 is used to terminate the tip portion 2D of the reinforcing member 2 (S35). Finally, the metal wire 100 is removed from the lumen 6L of the inner layer tube 6 (S37). With the above, the manufacturing process of the catheter 1 is completed.
- the user shapes (shapes) the tip of the catheter 1 as needed.
- the user is a doctor or the like.
- the lumen 6L of the catheter 1 is passed through a guide wire previously inserted into the blood vessel.
- the user applies a force to the proximal end side of the catheter 1 and pushes the catheter 1 into the blood vessel in order from the distal end side.
- the user rotates the catheter 1 as necessary to direct the tip of the catheter 1 in a desired direction. In this way, the user makes the tip of the catheter 1 reach the target site in the blood vessel.
- the user then removes the guide wire from the catheter 1. In this state, the user injects a contrast medium from the connector 9 or inserts an embolic substance as needed.
- the reinforcing member 2 is curved at the curved portion 2R.
- the first strand [x] and the second strand [x] are joined to each other even when a force is applied by bending the reinforcing member 2 at the curved portion 2R. Can be maintained.
- the catheter 1 can bond the first wire 3 [x] and the second wire 4 [x] more firmly.
- Catheter 1 includes an inner layer tube 6.
- the inner layer tube 6 can prevent the wire or the like from being caught by the reinforcing member 2 when the wire or the like passes through the lumen 2L of the reinforcing member 2.
- the catheter 1 includes an outer layer tube 7 that covers the reinforcing member 2 from the outside. The outer layer tube 7 can prevent the reinforcing member 2 from being exposed. Therefore, the catheter 1 can reduce the possibility that the reinforcing member 2 is caught in the blood vessel when passing through the blood vessel.
- the light transmittance of the inner layer tube 6 is higher than the light transmittance of the outer layer tube 7.
- the inner layer tube 6 when the first strand 3 [x] and the second strand 4 [x] are joined by irradiation with a laser beam, it is possible to suppress the inner layer tube 6 from generating heat due to the absorption of the laser beam. Therefore, in the catheter 1, the inner layer tube 6 generates heat when irradiated with laser light, and the plurality of first strands 30 and the plurality of second strands 40 are affected by heat at a site other than the junction 5 [x]. The possibility of receiving and deforming can be reduced. Further, by using polytetrafluoroethylene as the material of the inner layer tube, the inner layer tube 6 having a high transmittance can be easily realized.
- the first wire 3 [x] is arranged outside the third direction with respect to the second wire 4 [x].
- a laser beam from a light source arranged outside in the third direction in the manufacturing process of the catheter 1 is appropriately applied to the first wire 3 [x], and the first wire 3 [x] and the second wire 3 [x] are used. It can be appropriately joined to the wire 4 [x].
- the laser beam is irradiated, more energy of the laser beam is given to the first strand 3 [x] having a high melting point, and the first strand 3 [x] can be melted. Further, it is possible to suppress the supply of laser light energy to the second strand 4 [x] having a low melting point, and to melt and melt the second strand 4 [x].
- the cross-sectional shape of the first wire 3 is a perfect circle, and the cross-sectional shape of the second wire 4 is a rectangle.
- a gap can be formed between the first strands 3 [x] and the second strands 4 [x] before they are joined. Therefore, it is possible to easily melt and contact the portions forming the gaps in each of the first wire 3 [x] and the second wire 4 [x] to alloy them. Therefore, it is easily possible to alloy the first wire 3 [x] and the second wire 4 [x] at the contact portion to form the joint portion 5 [x].
- the plurality of first strands 30 have a larger absorption coefficient than the plurality of second strands 40.
- the first wire 3 [x] having a relatively large melting point and the second wire 4 [x] having a relatively small melting point are simultaneously melted and alloyed, and the second wire [x] is formed. ] Can be realized by irradiating a single laser beam.
- the composition of the second wire 4 [x] does not change even when laser light is applied to blow the first wire [x] except for the joint portion 5 [x]. Therefore, the composition of the portion of the second strand 4 [x] excluding the joint portion 5 [x] is the same regardless of the distance from the joint portion 5 [x]. Therefore, since the catheter 1 can stably maintain the composition of the second wire 4, the strength of the braided body 20 can be maintained.
- the material of the plurality of first strands 30 is tungsten
- the material of the plurality of second strands 40 is stainless steel (SUS).
- SUS stainless steel
- the catheter 1 can realize good indentability due to the high hardness of tungsten. Further, since tungsten has an excellent radiation shielding ability, the position of the catheter 1 in the body can be easily confirmed by irradiation.
- the end portion may be unraveled due to the elasticity of the first wire 3 and the second wire 4. Further, when tungsten is used as the first wire 3, the indentation characteristic of the catheter 1 is improved because of its high hardness, but it cannot be easily cut with a normal blade.
- the laser beam irradiated to the first irradiation region 51 [x] in S13 first supplies energy to a part of the first strand 3 [x]. Then, the first strand 3 [x] is melted. At the same time, the laser beam supplies energy to the second wire 4 [x] to melt and melt the second wire [x], and the melted first wire 3 [x] and the second wire. Wire 4 "x" is alloyed and joined.
- the laser beam irradiated to the second irradiation region 52 [x] in S25 supplies energy to the first strand 3 [x] and blows the first strand 3 [x].
- the first laser light irradiation is performed.
- the position of the second wire 4 [x] shifts due to this, the position of the fusing portion of the second wire 4 [n] shifts from the target position. In this case, the position of the joint portion 5 "n" and the fusing portion of the second wire 4 [n] may be displaced.
- the first wire 3 [x] and the second wire 4 [x] are joined by alloying and the second wire is joined.
- the energy of the laser beam irradiated in S13 is first donated to the first wire 3 [x], and the remaining energy is donated to the second wire 4 [x]. Therefore, even when the melting point of the first strand 3 is higher than the melting point of the second strand 4 by 500 ° C. or more, the joining of the first strand 3 [x] and the second strand 4 [x] and the second. Fusing of the strand 4 [x] can be efficiently performed by irradiating the strand 4 [x] with a single laser beam.
- the first wire 3 [x] and the second wire 4 [x] are joined after the first wire 3 [x] is blown, the first wire 3 [x] moves at the time of fusing.
- the positional relationship between the first strand 3 [x] and the second strand [x] may shift. In this case, it may not be possible to accurately join the first strand 3 [x] and the second strand 4 [x].
- the first wire 3 [x] is fused.
- the position of the first strand 3 [x] with respect to the second strand 4 [x] is less likely to shift due to the joining of the first strand 3 [x] and the second strand 4 [x]. .. Therefore, the joining of the first strand 3 [x] and the second strand 4 [x] and the cutting of the first strand 3 [x] can be performed with high accuracy.
- the energy supplied to the braid 20 by the irradiation of the laser beam by S13 and S25 is changed with time. More specifically, when the laser light is irradiated by S13 and S25, the laser light is intermittently irradiated a plurality of times. In this case, it is possible to suppress the transfer of heat from the irradiation region of the laser beam to the surroundings in the first wire 3 and the second wire. In this case, it is possible to prevent the occurrence of dissolution, evaporation, and extinction of the first wire 3 and the second wire 4 arranged in the vicinity of the irradiation region of the laser beam.
- the irradiation condition of the laser beam in S13 and the irradiation condition of the laser beam in S25 are the same. That is, since the irradiation conditions of the laser beam in different processes can be standardized, the manufacturing work of the catheter 1 can be made more efficient.
- the first wire 3 [x] is arranged outside the third direction with respect to the second wire 4 [x].
- the first strand 3 [x + 1] is the second. It is arranged outside the third direction with respect to the strand 4 [x]. In this case, when the first strand 3 [x] and the second strand 4 [x] are joined at the junction intersection Qc [x] by irradiating the laser beam in S13, the second strand 4 [x] is joined.
- the second strand 4 [x + 1] is It is arranged outside the third direction with respect to the first strand 3 [x]. In this case, when the first strand 3 [x] and the second strand 4 [x] are joined at the junction intersection Qc [x] by irradiating the laser beam in S13, the first strand 3 [x] is joined.
- the joints 5 [n] and 5 [n + 1] are arranged side by side in the stretching direction.
- the joint portions 5 [n + 2] and 5 [n + 3] are arranged side by side in the stretching direction.
- the joint portions 5 [n + 4] and 5 [n + 5] are arranged side by side in the stretching direction.
- the joint portions 5 [n], 5 [n + 2], and 5 [n + 4] are arranged in a direction orthogonal to the stretching direction.
- the joints 5 [n + 1], 5 [n + 3], and 5 [n + 5] are arranged in a direction orthogonal to the stretching direction.
- the laser beam is irradiated in a state where the laminar inert gas is sprayed on the reinforcing member 2.
- the surrounding air can be prevented from coming into contact with the first wire 3 and the second wire 4, so that the second wire by the laser irradiation can be prevented from coming into contact with the first wire 3. It is possible to suppress the occurrence of oil burning and oxidation of the 1st wire 3 and the 2nd wire 4.
- the inner layer tube 6 is arranged around the metal wire 100, and the metal wire 100 and the inner layer tube 6 are arranged in the lumen 2L of the reinforcing member 2. Further, after the cutting of both ends of the reinforcing member 2 in the stretching direction is completed, the outer layer tube 7 is arranged around the reinforcing member 2 in the post-step shown in S33. Thereby, the catheter 1 provided with the reinforcing member 2, the inner layer tube 6, and the outer layer tube 7 can be manufactured. In particular, by using the metal wire 100, the catheter 1 provided with the thin inner layer tube 6 can be easily manufactured. Further, the surface of the metal wire 100 is plated in silver to reflect the laser beam irradiated in the manufacturing process.
- the light transmittance of the inner layer tube 6 is higher than the light transmittance of the outer layer tube 7, it is possible to suppress the inner layer tube 6 from generating heat due to the absorption of the laser beam. Therefore, it is possible to reduce the possibility that the inner layer tube 6 is melted and damaged by heat generation due to irradiation with laser light.
- the thermal conductivity of the metal wire 100 is set to 350 to 450 w / mK.
- heat diffusion is promoted by using a material having high thermal conductivity as the material of the metal wire 100.
- a material having a high thermal conductivity among the metal wires 100 the local temperature rise of the metal wire 100 can be suppressed by heat diffusion. Therefore, the possibility that the inner layer tube 6 is melted due to the temperature rise of the metal wire 100 can be reduced.
- the present invention is not limited to the above embodiment, and various modifications can be made.
- the joint portion 5 [x] that joins the first strand 3 [x] and the second strand 4 [x] is formed only on the tip end side of the reinforcing member 2, even if it is not formed on the proximal end side. good.
- the joint portion 5 [x] that joins the first strand 3 [x] and the second strand 4 [x] is formed only on the proximal end side of the reinforcing member 2 and not on the distal end side. You may.
- the difference in melting point between the plurality of first strands 30 and the plurality of second strands 40 was about 2000 ° C.
- the melting point of the plurality of first strands 30 may be higher than the melting point of the plurality of second strands 40 by about 500 ° C.
- copper may be used as the material for the plurality of first strands 30, and SUS may be used as the material for the plurality of second strands 40.
- the melting point of the plurality of first strands 30 may be higher than the melting point of the plurality of second strands 40 by about 700 ° C.
- aluminum may be used as the material for the plurality of first strands 30, and SUS may be used as the material for the plurality of second strands 40.
- the melting point of the plurality of first strands 30 may be higher than the melting point of the plurality of second strands 40 by about 1000 ° C.
- aluminum may be used as the material for the plurality of first strands 30, and titanium may be used as the material for the plurality of second strands 40.
- the melting point of the plurality of first strands 30 is defined to be 500 ° C. or higher higher than the melting point of the plurality of second strands 40, but more preferably 700 ° C. or higher may be higher, and more preferably. May be 1000 ° C. or higher.
- the curved portion 2R of the catheter 1 may be provided in the vicinity of the proximal end portion 2P, or may be provided in both the distal end portion 2D and the proximal end portion 2P.
- the curved portion 2R of the catheter 1 may be formed by the user. In this case, the catheter 1 may be shipped in a state of being linearly extended in the stretching direction. The catheter 1 may be used after the curved portion 2R is formed on the distal end portion 2D by the user.
- the portion on the second tip side of the junction intersection Qc [x] may extend linearly without being curved.
- the end portion of the first strand 3 [x] on the first tip side that is, the end portion fused by the irradiation of the laser beam, is the first in the first direction with respect to the junction intersection Qc [x].
- the distance is 0.03 mm to 0.15 mm on the tip side, but this distance can be changed as appropriate.
- the catheter 1 has only the inner layer tube 6 and the reinforcing member 2, and does not have to include the outer layer tube 7.
- the catheter 1 may have only the reinforcing member 2 and the outer layer tube 7 and may not include the inner layer tube 6.
- the hardness of the outer layer tube 7 may be uniform over the entire area in the stretching direction.
- the inner layer tube 6 may have portions having different hardness.
- the respective sites having different hardness of the inner layer tube 6 may be arranged in the stretching direction.
- the thickness of the outer layer tube 7 does not have to be uniform in the stretching direction, and a plurality of portions having different thicknesses may be arranged in the stretching direction.
- the catheter 1 may be composed of only the reinforcing member 2.
- the light transmittance of the inner layer tube 6 is not limited to the above embodiment, and may be another value.
- the light transmittance of the inner layer tube 6 may be the same as the light transmittance of the outer layer tube 7, or may be lower than the light transmittance of the outer layer tube 7.
- the material of the inner layer tube 6 is not limited to PTFE and may be another material.
- the extinction coefficient of the plurality of first strands 30 may be the same as the extinction coefficient of the plurality of second strands 40, or may be smaller than the extinction coefficient of the plurality of second strands 40.
- the cross-sectional shape of the plurality of first strands 30 is not limited to a perfect circle and may be an ellipse.
- the cross-sectional shape of the plurality of first strands 30 may be rectangular, and the cross-sectional shape of the plurality of second strands 40 may be circular.
- the cross section of any of the plurality of first strands 30 and the plurality of second strands 40 may be either circular or rectangular.
- the material of the plurality of first strands 30 is not limited to tungsten.
- the material of the plurality of second strands 40 is not limited to SUS.
- Each material of the plurality of first strands 30 and the plurality of second strands 40 satisfies the condition that the melting point of the plurality of first strands 30 is 500 ° C. or higher higher than the melting point of the plurality of second strands 40.
- any various material may be used.
- molybdenum, platinum, and gold may be used as the plurality of first strands 30, and nickel alloys, titanium alloys, and aluminum alloys may be used as the plurality of second strands 40.
- SUS having different compositions may be used as the first wire 30 and the second wire 40.
- the irradiation pattern when irradiating the laser beam in S13 and S25 is not limited to the above embodiment.
- S13 and 25 even if a laser beam having a relatively low intensity is first irradiated and then a laser beam having a relatively high intensity is irradiated as shown in FIG. 19B. good.
- the range of the portion of the first wire 3 and the second wire 4 that is generated by the laser light can be limited. This effect is commonly referred to as the slow-up effect.
- the output pattern of the laser beam in S13 and S25 is not limited to the above.
- an operation of intermittently irradiating the laser beam and an operation of gradually increasing the intensity of the laser beam may be used in combination.
- the number of times the laser beam irradiation is performed intermittently is not limited to the above embodiment.
- a laser beam having a relatively high intensity may be irradiated first, and then a laser beam having a relatively low intensity may be irradiated.
- the change of the irradiation mode of the laser beam is performed only in S13 and may not be performed in S25.
- the change of the irradiation mode of the laser beam is executed only in S25 and may not be executed in S13.
- the laser light emitted by S13 and S25 may be continuously irradiated with a uniform intensity. That is, the energy supplied to the braid 20 by the irradiation of the laser beam does not have to change with time.
- the braided body 20 may be a wire mesh in which a plurality of first strands 30 and a plurality of second strands 40 alternately intersect each other, so-called plain weave wire mesh.
- the mode in which the plurality of first strands 30 and the plurality of second strands 40 are woven is not limited to the plain weave wire mesh and the twill weave wire mesh, and may be another mode.
- the first strand 3 [x + 1] may be arranged inside the second strand 4 [x] in the third direction.
- the second strand 4 [x + 1] may be arranged inside the first strand 3 [x] in the third direction.
- the inert gas may be injected and filled as the atmosphere around the reinforcing member 2 before the laser beam is irradiated.
- the material and conductivity of the metal wire 100 used in the manufacturing process of the catheter 1 are not limited to the above-described embodiment.
- the metal wire 100 may not be used in the manufacturing process of the catheter 1.
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Abstract
Description
前記複数の第1素線の融点は、前記複数の第2素線の融点よりも500℃以上高く、
前記補強部材の前記延伸方向の両端部の少なくとも一方において、前記複数の第1素線及び前記複数の第2素線が交差する複数の交点の一部である接合交点に接合部が形成され、
前記接合部は、
前記複数の交点のうち接合交点[n]で互いに交差する第1素線[n]及び第2素線[n]を、夫々の接触部分で合金化することで接合し、
前記接合交点[n]において、前記第1素線[n]は前記第2素線[n]に対し、前記第1方向及び前記第2方向と直交する第3方向の一方側に配置された
ことを特徴とするカテーテルを製造する製造方法であって、
前記接合交点[n]において、前記編組体を前記第3方向の一方側から視た状態で前記第1素線[n]と前記第2素線[n]とが重複する接合領域[n]のうち前記第2方向の一方側の一部と、前記第2素線[n]のうち前記第1素線[n]と重複しない部分とを少なくとも含む第1照射領域[n]に対し、前記第3方向の一方側からレーザ光を照射することによって、前記第1素線[n]と前記第2素線[n]とを前記接合交点[n]において合金化させて接合させ、且つ、前記第2素線[n]のうち前記接合交点[n]に対して前記第2方向の一方側の部分を溶断する第1照射工程と、
前記第1照射工程によるレーザ光の照射の後、前記第1素線[n]のうち前記接合交点[n]に対して前記第1方向の一方側に離隔した第2照射領域[n]に、前記第3方向の一方側からレーザ光を照射することによって、前記第1素線[n]を前記第2照射領域[n]の位置で切断する第2照射工程と
を備えたことを特徴とする。
レーザ光の照射によって前記編組体に供与されるエネルギーを経時的に変化させて照射してもよい。
強度が相対的に小さいレーザ光を照射する前照射工程と、
前記前照射工程の後、強度が相対的に大きいレーザ光を照射する後照射工程と
を備えてもよい。
レーザ光を間欠的に複数回照射してもよい。
前記複数の交点のうち、前記第2素線[n]に対して前記第1方向の他方側に隣接する第2素線[n+1]と前記第1素線[n]とが交差する第2交点において、前記第2素線[n+1]は前記第1素線[n]に対して前記第3方向の一方側に配置されてもよい。
前記第3照射工程によるレーザ光の照射の後、前記第1素線[n+1]のうち前記接合交点[n+1]に対して前記第1方向の一方側に離隔した第2照射領域[n+1]に、前記第3方向の一方側からレーザ光を照射することによって、前記第1素線[n+1]を前記第2照射領域[n+1]の位置で切断する第4照射工程と
を備えてもよい。
前記補強部材に対して、層流状態の不活性ガスが吹き付けられた状態でレーザ光が照射されてもよい。
前記第1照射工程及び前記第2照射工程では、
前記前工程により準備された前記補強部材の前記編組体にレーザ光が照射され、
前記第2照射工程によるレーザ光の照射後、前記補強部材の周囲に円筒状の外層チューブを配置する後工程を更に備えてもよい。
以下、本発明の実施形態について、図面を参照して説明する。図1、図2に示すように、カテーテル1は、補強部材2、内層チューブ6、及び外層チューブ7を有する。以下、カテーテル1に沿って延びる方向を、「延伸方向」という。カテーテル1の延伸方向の両端のうち一方側に対応する端部を「先端部1D」という。カテーテル1の延伸方向の両端のうち他方側に対応する端部を「基端部1P」という。カテーテル1は、ワイヤ等を通すための内腔6Lを内部に有する。内腔6Lは、カテーテル1の先端部1Dと基端部1Pとの間に亘って延伸方向に延びる。カテーテル1にワイヤ等を通すためのコネクタ9は、カテーテル1の基端部1Pに接続される。補強チューブ90は、カテーテル1の基端部1Pとコネクタ9との接続部分の近傍を補強する。延伸方向と直交する平面において、カテーテル1の断面中心を通る線分(「中心線C」という。)を基準とする半径方向を、第3方向という。第3方向のうち、カテーテル1の中心線Cに近接する側を「内側」といい、カテーテル1の中心線Cから離隔する側を「外側」という。
補強部材2は、可撓性を有する筒状の部材である。補強部材2は、カテーテル1の延伸方向の強度を補強する。補強部材2は、延伸方向に沿ってカテーテル1の先端部1Dから基端部1Pまで延びる。補強部材2は、金属製の複数の素線が織り込まれた編組体20(図3参照)が円筒状とされ、その両端部が切断されることによって形成される。中心線Cは、編組体20の中心を通って延伸方向に延びる。
(1)レーザ光の照射により第1素線3[x]と第2素線4[x]とが溶融されている。
(2)第1素線3[x]と第2素線4[x]との夫々の成分が混合、拡散され、その後に溶融凝固されている。
(3)第1素線3[x]と第2素線4[x]との間の界面全てが金属間化合物の層で覆われていない。
(4)(3)における金属化合物の層を境に、第1素線3[x]と第2素線4[x]とが分離されておらず、固溶体も形成され、両者が良好に混ざり合っている。
接合交点Qc[n]及び接合交点Qc[n+1]、接合交点Qc[n+2]及び接合交点Qc[n+3]、接合交点Qc[n+4]及び接合交点Qc[n+5]は、夫々、延伸方向に並んで配置される。
図2に示すように、内層チューブ6は、中心線Cを中心とした円筒状を有し、補強部材2の内腔2Lに配置される。内層チューブ6の材料は、ポリテトラフルオロエチレン(PTFE)である。内層チューブ6の光透過率は、90%以上である。内層チューブ6の内腔6Lは延伸方向に延び、カテーテル1の内腔6Lを形成する。内層チューブ6は、カテーテル1の内腔6Lと補強部材2とを隔てる為に設けられ、内腔6Lを通過するワイヤ等が補強部材2に引っ掛ることを防止する。
図10を参照し、カテーテル1の製造方法について説明する。本実施形態では、補強部材2の延伸方向の両端がレーザ光の照射により接合、溶断され、先端部2D及び基端部2Pが形成されることによってカテーテル1が製造される。はじめに補強部材2の先端がレーザ光の照射により切断されて先端部2Dが形成され、次いで、補強部材2の基端がレーザ光の照射により切断されて基端部2Pが形成されることを前提とする。
カテーテル1の使用方法の一例について説明する。はじめに、ユーザは、必要に応じてカテーテル1の先端に形状付け(シェイピング)を行う。ユーザは医師等である。次に、血管内に先行して挿通されたガイドワイヤーに、カテーテル1の内腔6Lが通される。ユーザは、カテーテル1の基端側に力を加え、カテーテル1を先端側から順に血管内に押し込む。なお、ユーザは、必要に応じてカテーテル1を回転させ、カテーテル1の先端を所望する方向に向ける。このようにして、ユーザは、カテーテル1の先端を、血管内の目的部位に到達させる。その後、ユーザは、ガイドワイヤーをカテーテル1から抜去する。この状態で、ユーザは、必要に応じてコネクタ9から造影剤を注入したり、塞栓物質の挿入を行ったりする。
カテーテル1は、第1素線3[x]と第2素線4[x]とを夫々の接触部分で合金化し、第1素線3[x]及び第2素線4[x]が接合されることにより、接合部5[x]が形成される。従って、カテーテル1は、融点が500℃以上異なる複数の第1素線30及び複数の第2素線40からなる編組体20が補強部材2として用いられた場合において、補強部材2の延伸方向の端部を解け難くできる。
本発明は上記実施形態に限定されず、種々の変更が可能である。第1素線3[x]と第2素線4[x]とを接合する接合部5[x]は、補強部材2の先端側にのみ形成され、基端側には形成されなくてもよい。又は、第1素線3[x]と第2素線4[x]とを接合する接合部5[x]は、補強部材2の基端側にのみ形成され、先端側には形成されなくてもよい。複数の第1素線30と複数の第2素線40との融点の差は、約2000℃であった。これに対し、複数の第1素線30の融点は、複数の第2素線40の融点よりも、約500℃高くてもよい。この場合、複数の第1素線30の材料として銅が用いられ、複数の第2素線40の材料としてSUSが用いられてもよい。又、複数の第1素線30の融点は、複数の第2素線40の融点よりも、約700℃高くてもよい。この場合、複数の第1素線30の材料としてアルミニウムが用いられ、複数の第2素線40の材料としてSUSが用いられてもよい。又、複数の第1素線30の融点は、複数の第2素線40の融点よりも、約1000℃高くてもよい。この場合、複数の第1素線30の材料としてアルミニウムが用いられ、複数の第2素線40の材料としてチタンが用いられてもよい。上記実施形態において、複数の第1素線30の融点は、複数の第2素線40の融点よりも500℃以上高いと規定したが、より好適には700℃以上高くてもよく、更に好適には1000℃以上高くてもよい。
Claims (12)
- 第1方向に延びる複数の第1素線と、前記第1方向と交差する第2方向に延びる複数の第2素線とが網状に織り込まれた編組体からなり、延伸方向に延びる筒状の補強部材を少なくとも備え、
前記複数の第1素線の融点は、前記複数の第2素線の融点よりも500℃以上高く、
前記補強部材の前記延伸方向の両端部の少なくとも一方において、前記複数の第1素線及び前記複数の第2素線が交差する複数の交点の一部に接合部が形成され、
前記接合部は、
前記複数の交点の一部で互いに交差する前記複数の第1素線及び前記複数の第2素線である第1交差素線及び第2交差素線を接合し、
前記第1交差素線及び前記第2交差素線の夫々の接触部分で合金化することで接合する
ことを特徴とするカテーテル。 - 前記複数の第1素線及び前記複数の第2素線の夫々のうち、前記延伸方向の両端部の少なくとも一方は、前記延伸方向に対して湾曲した湾曲部を有することを特徴とする請求項1に記載のカテーテル。
- 前記第2交差素線のうち前記接合部よりも先端側の第2先端部が、前記第1交差素線に巻きついたことを特徴とする請求項1又は2に記載のカテーテル。
- 前記補強部材の中心軸を中心とした筒状を有し、前記補強部材の内腔に配置された内層チューブと、
前記中心軸を中心とした筒状を有し、前記補強部材を外側から覆う外層チューブと
を備えたことを特徴とする請求項1から3の何れかに記載のカテーテル。 - 前記内層チューブの光透過率が、前記外層チューブの光透過率よりも高いことを特徴とする請求項4に記載のカテーテル。
- 前記内層チューブの材料が、ポリテトラフルオロエチレンであることを特徴とする請求項4又は5に記載のカテーテル。
- 前記第1交差素線は、前記第2交差素線に対して、前記第1方向及び前記第2方向と直交する第3方向の一方側に配置されたことを特徴とする請求項1から6の何れかに記載のカテーテル。
- 前記複数の第1素線及び前記複数の第2素線のうち一方の断面形状が円形であり、
前記複数の第1素線及び前記複数の第2素線のうち他方の断面形状が矩形である
ことを特徴とする請求項1から7の何れかに記載のカテーテル。 - 前記複数の第1素線の断面形状が円形であり、
前記複数の第2素線の断面形状が矩形である
ことを特徴とする請求項8に記載のカテーテル。 - 前記複数の第1素線は、前記複数の第2素線よりも吸光係数が大きいことを特徴とする請求項9に記載のカテーテル。
- 前記第2交差素線のうち前記接合部を除く部分の組成が、前記接合部からの距離に関わらず等しいことを特徴とする請求項1から10の何れかに記載のカテーテル。
- 前記複数の第1素線の材料がタングステンであり、前記複数の第2素線の材料がステンレスであることを特徴とする請求項1から11の何れかに記載のカテーテル。
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JP2015171616A (ja) * | 2015-07-08 | 2015-10-01 | 朝日インテック株式会社 | カテーテル |
JP2016217455A (ja) * | 2015-05-20 | 2016-12-22 | 日星電気株式会社 | 管状部材及び補強層先端部の加工方法 |
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JP2016217455A (ja) * | 2015-05-20 | 2016-12-22 | 日星電気株式会社 | 管状部材及び補強層先端部の加工方法 |
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