WO2016136767A1 - カテーテルおよびカテーテルの製造方法 - Google Patents
カテーテルおよびカテーテルの製造方法 Download PDFInfo
- Publication number
- WO2016136767A1 WO2016136767A1 PCT/JP2016/055318 JP2016055318W WO2016136767A1 WO 2016136767 A1 WO2016136767 A1 WO 2016136767A1 JP 2016055318 W JP2016055318 W JP 2016055318W WO 2016136767 A1 WO2016136767 A1 WO 2016136767A1
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- WO
- WIPO (PCT)
- Prior art keywords
- shaft
- core wire
- proximal
- catheter
- proxy
- Prior art date
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Classifications
-
- 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
- A61M25/0021—Catheters; Hollow probes characterised by the form of the tubing
- A61M25/0023—Catheters; Hollow probes characterised by the form of the tubing by the form of the lumen, e.g. cross-section, variable diameter
- A61M25/0026—Multi-lumen catheters with stationary elements
-
- 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
-
- 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
-
- 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
-
- 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
- A61M25/0021—Catheters; Hollow probes characterised by the form of the tubing
- A61M25/0023—Catheters; Hollow probes characterised by the form of the tubing by the form of the lumen, e.g. cross-section, variable diameter
- A61M25/0026—Multi-lumen catheters with stationary elements
- A61M2025/0034—Multi-lumen catheters with stationary elements characterized by elements which are assembled, connected or fused, e.g. splittable tubes, outer sheaths creating lumina or separate cores
-
- 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
- A61M2025/006—Catheters; Hollow probes characterised by structural features having a special surface topography or special surface properties, e.g. roughened or knurled surface
Definitions
- the present invention relates to a catheter used in the medical field, and more particularly to a catheter including a proxy shaft and a core wire made of different materials and a method for manufacturing the same.
- a catheter is used for injecting a drug solution into a body such as a blood vessel or an abdominal cavity or collecting blood or body fluid.
- the catheter is also used for treatment and examination in a body such as a blood vessel.
- a catheter is inserted into a stenosis site of a blood vessel, for example. The user then performs a procedure to restore blood flow by expanding the stenotic region with a balloon attached to the distal end portion of the catheter.
- the user is a doctor or the like.
- the user operates such a catheter from the proximal end portion located outside the body, and inserts the catheter into the body along a curved blood vessel or the like from the distal end portion inserted into the body. Therefore, the catheter is required to have a soft deformation characteristic that can be easily bent along the blood vessel and pushability that can transmit the operation force to the distal end side.
- a soft distal shaft is provided on the tip side of a hard proxy shaft as described in, for example, Japanese Patent Application Laid-Open No. 2013-17717 (Patent Document 1).
- Catheters having a structure connected in series are known.
- tip of a proxy shaft is proposed.
- the core wire avoids a significant change in the hardness at the connecting portion of the shafts of different materials.
- the catheter can be prevented from being bent or kinked.
- the operating force applied from the proximal end side of the catheter during insertion into the curved portion or the like of the blood vessel is efficiently transmitted to the distal end side, and the distal end portion easily follows the blood vessel and becomes easy to insert.
- the materials of the proximal shaft, distal shaft, and core wire in such a catheter are selected based on conditions such as corrosion resistance, human body risk, and dimensional size.
- the core wire is welded and secured directly to the proximal shaft and is located within the lumen of the catheter.
- the proximal shaft and the core wire are formed of materials that are not directly welded to each other, sufficient strength may not be obtained by welding. Therefore, even when a material that is difficult to be directly welded to the proximal shaft is suitable as the core wire, a new technique for securely fixing both is required.
- the present invention has been made in the background as described above, and the problem to be solved is that a proxy shaft and a core wire made of a material difficult to be directly welded are simply and sufficiently made. It is an object of the present invention to provide a catheter having a novel structure and a novel manufacturing method of the catheter that can be fixed with a sufficient strength.
- a first aspect of the present invention made in order to solve such a problem is a core wire including a proxy shaft formed of a first material and an insertion portion inserted into a tip portion of the proxy shaft.
- a core wire formed of a second material that is difficult to weld directly to the first material, and a protrusion that protrudes from the tip portion of the proxy shaft toward the insertion portion of the core wire.
- at least one fixing portion including a recess formed in the insertion portion of the core wire.
- a mechanical fixing structure in which a part of the peripheral wall of the proxy shaft bites into the outer peripheral surface of the core wire is employed.
- a second aspect of the present invention is the catheter according to the first aspect, wherein the at least one fixing part is a plurality of first fixing parts formed at different positions in the length direction.
- the third aspect of the present invention is the catheter according to the first or second aspect, wherein the at least one fixing part is a plurality of second fixing parts formed at different positions in the circumferential direction.
- the fixing strength and reliability of the proximal shaft and the core wire can be improved by a plurality of fixing portions.
- the fixing portions are provided apart from each other, the deterioration of the bending deformation characteristics at the fixing portion of the proxy shaft and the core wire can be suppressed as compared with the continuous fixing portion.
- the joint strength in the rotational direction around the fixed portion can be secured by the interaction of the plurality of fixed portions, and the connecting portion such as the fixed strength required by changing the number and position of the fixed portions. It is also possible to adjust the characteristics.
- an arc-shaped cross section in which the distal end portion of the proximal shaft is opened at a part of the circumference is a longitudinal direction.
- the at least one fixing portion is formed in a portion where the cutout portion and the insertion portion of the core wire overlap each other.
- the distal end side of the proxy shaft is extended in a substantially bowl shape, and the core wire is inserted into the proximal shaft. It is possible to easily ensure the flow path cross-sectional area inside the distal shaft that covers the distal end side of the inserted proxy shaft.
- the catheter in the catheter according to the fourth aspect, includes a distal shaft connected to the proxy shaft, the proximal end of the core wire and the proximal end of the notch An opening region that is a region that communicates the first lumen of the proxy shaft and the second lumen of the distal shaft.
- the lumen of the proxy shaft and the lumen of the distal shaft are communicated with each other by the opening region, so that it becomes easier to secure the flow path cross-sectional area of the catheter.
- the proxy shaft in the catheter according to any one of the first to fourth aspects, includes a stepped portion that is a portion whose diameter decreases from the proximal end side toward the distal end side.
- a small-diameter cylindrical portion extending from the distal end of the step-shaped portion toward the distal end side, and the insertion portion of the core wire is inserted into the small-diameter cylindrical portion, A communication hole for communicating the first lumen of the shaft with the second lumen of the distal shaft is formed.
- the joint strength and stability can be improved by bringing the peripheral wall portion close to the outer peripheral surface of the core wire in the small diameter cylindrical portion of the proxy shaft.
- the communication hole formed in the stepped portion of the proximal shaft makes it possible to secure the cross-sectional area of the flow path at the connecting portion between the proximal shaft and the distal shaft while securing the bonding strength of the core wire. .
- the inner diameter on the distal end side of the proxy shaft is larger than the outer diameter on the proximal end side of the core wire by a predetermined amount, Including a concave deformed portion in which a clearance between the proximal end side of the core wire and the outer peripheral surface of the core wire is reduced by partially deforming the distal end side of the proximal shaft into a concave shape toward the inner peripheral side, and the at least one fixed Each of the portions is formed between the core wire and the concave deformation portion.
- the catheter configured according to this aspect by making the inner diameter dimension on the distal end side of the proximal shaft larger than the outer diameter dimension on the proximal end side of the core wire, it is easy to secure a fluid flow path therebetween. Become. Moreover, joint strength and stability can be advantageously ensured by providing a partial concave deformation portion on the peripheral wall portion of the proximal shaft so as to approach the core wire.
- the front end side of the proximal shaft in which the concave deformation portion is formed in this aspect is not limited to the cylindrical peripheral wall portion, but may be a notch-like portion extending in the arc-shaped cross section as described in the fourth aspect. good.
- An eighth aspect of the present invention is the catheter according to any one of the first to seventh aspects, wherein the proxy shaft is made of stainless steel and the core wire is made of nitinol.
- the core wire is formed of nitinol. Therefore, the rigidity of the distal shaft is excellent in kink resistance.
- the proxy shaft is made of stainless steel. Therefore, the proximal shaft has excellent characteristics without changing stainless steel, which is a conventionally used material.
- a core wire insertion portion formed of a second material that is difficult to directly weld to the first material at a distal end portion of the proxy shaft formed of the first material.
- the joining step includes an irradiation step of irradiating an energy beam in a spot shape. According to the manufacturing method of this aspect, the catheter can be easily manufactured using the effect of the energy beam spot irradiation.
- a proxy shaft and a core wire each having a predetermined configuration so as to realize the configurations described in the second to eighth aspects can be appropriately used as necessary.
- a mechanical fixing structure in which a part of the peripheral wall of the proximal shaft bites into the outer peripheral surface of the core wire locally is adopted, so that the proximal shaft and the core wire are directly connected. Even if they cannot be welded to each other, they can be directly fixed to each other with a simple structure.
- the catheter having a specific structure according to the present invention can be manufactured with excellent mass productivity.
- FIG. 1 shows an overall view of a balloon catheter 10 which is an embodiment of the catheter of the present invention.
- the right side and the left side in FIG. 1 are the proximal end side and the distal end side of the balloon catheter 10, respectively.
- the balloon catheter 10 of the present embodiment is used for percutaneous angioplasty. Specifically, for example, the user inserts a guide wire (not shown) into the blood vessel. The user inserts the balloon catheter 10 into the blood vessel along the guide wire. The user inserts the distal end portion of the balloon catheter 10 into the blood vessel until reaching the lesion site of the stenotic or occluded blood vessel. Then, the user operates the proximal end portion of the balloon catheter 10 to expand the lesion site in the blood vessel and perform a blood flow recovery treatment.
- a guide wire not shown
- the balloon catheter 10 includes a shaft 12 having a predetermined length.
- the shaft 12 extends in the length direction of the balloon catheter 10 and has flexibility.
- a hub 14 is connected to the proximal end portion of the shaft 12.
- the proximal end of the shaft 12 is the proximal side of the operator.
- a balloon 16 that is expandable in the radial direction is connected to the tip of the shaft 12.
- the basic structure of the balloon catheter 10 including the shaft 12, the hub 14, and the balloon 16 is publicly known as described in Patent Document 1.
- the balloon catheter 10 is configured to be able to supply and discharge pressure fluid to and from the balloon 16 from an external conduit connected to the hub 14 through a supply and discharge lumen 18 formed in the shaft 12.
- a guide wire tube 20 is provided at the tip of the shaft 12.
- the guide wire tube 20 is a tubular member.
- a guide wire lumen into which the guide wire can be inserted is formed in the guide wire tube 20.
- the guide wire tube 20 passes through the balloon 16.
- the guide wire tube 20 includes a portion protruding from the balloon 16 toward the distal end side.
- An opening on the distal end side of the guide wire lumen is formed on the distal end surface of the guide wire tube 20 protruding from the balloon 16.
- the guide wire tube 20 extends by a predetermined length from the distal end side of the shaft 12 toward the proximal end side.
- the proximal end side of the guide wire tube 20 is disposed so as to penetrate the peripheral wall portion of the shaft 12 so that the guide wire lumen opens on the outer peripheral surface of the shaft 12.
- the balloon catheter 10 has a rapid exchange type guide wire insertion structure in which a guide wire can be inserted into and removed from a guide wire lumen provided only on the distal end side of the shaft 12.
- the user performs blood flow recovery treatment using the balloon catheter 10.
- the user is a doctor or the like.
- the user percutaneously inserts a guide wire into a blood vessel and guides the tip of the guide wire to the lesion site.
- the user inserts the guide wire into the guide wire lumen of the balloon catheter 10 from the proximal end side, and guides the balloon catheter along the guide wire to the lesion site in the blood vessel.
- the balloon 16 is expanded by supplying pressure fluid from the hub 14 to the balloon 16 through the supply / discharge lumen 18.
- the lesion site of the blood vessel is expanded.
- the user discharges the pressure fluid from the balloon 16 through the supply / discharge lumen 18 and contracts the balloon 16 to contract.
- the user removes the balloon catheter 10 from the blood vessel.
- the shaft 12 of the balloon catheter 10 of the present embodiment includes a proxy shaft 22, a distal shaft 24, and a core wire 28.
- the proxy shaft 22 is located on the proximal side.
- the distal shaft 24 is located on the tip side.
- the proxy shaft 22 and the distal shaft 24 are joined in series in the catheter length direction.
- the proximal end portion of the core wire 28 is inserted into the distal end portion of the proxy shaft 22.
- Each of the proxy shaft 22, the distal shaft 24, and the core wire 28 has flexibility.
- the proximal shaft 22, the distal shaft 24, and the core wire 28 have different hardnesses.
- the proxy shaft 22 and the distal shaft 24 are formed of different materials. Therefore, the proxy shaft 22 and the distal shaft 24 have different characteristics.
- the proxy shaft 22 has a larger deformation rigidity than the distal shaft 24. Therefore, the operating force of the operator is efficiently transmitted to the catheter tip side by the proxy shaft 22.
- the distal shaft 24 is more flexible than the proxy shaft 22. Therefore, the balloon shaft 10 easily follows the curvature and branching when inserted into the blood vessel by the distal shaft 24.
- the shaft 12 Since the proxy shaft 22 and the distal shaft 24 of different materials are connected to each other, the shaft 12 achieves a high degree of compatibility with required characteristics such as pushability and tracking of the blood vessel shape. Thereby, the operability of the balloon catheter 10 is improved.
- the proxy shaft 22 and the distal shaft 24 may be set in consideration of required characteristics.
- the proxy shaft 22 is formed of a metal material such as stainless steel.
- the distal shaft 24 is formed of a synthetic resin material such as polyamide or polyolefin.
- the proximal end portion of the distal shaft 24 is extrapolated and fixed to the distal end portion of the proxy shaft 22 over a predetermined length.
- the portion fixed by fitting is referred to as a fitting fixing portion 26.
- the distal shaft 24 is melt-fixed to the outer peripheral surface of the proxy shaft 22 via an adhesive as necessary, and is sealed fluid-tightly.
- the outer peripheral surface of the proxy shaft 22 exposed to the base end side from the distal shaft 24 may include a protective layer made of a synthetic resin such as polytetrafluoroethylene as necessary.
- the inner peripheral surface of the distal shaft 24 may include a protective layer made of a synthetic resin such as polyimide, if necessary.
- the core wire 28 is located in the supply / discharge lumen 18 of the shaft 12 continuously formed by the proxy shaft 22 and the distal shaft 24.
- the supply / discharge lumen 18 is a flow path extending from the hub 14 into the balloon 16.
- the core wire 28 extends into the distal shaft 24 from the fitting and fixing portion 26 of the proxy shaft 22 and the distal shaft 24 toward the distal end side.
- the core wire 28 includes an insertion portion 30.
- the insertion portion 30 is a proximal end portion of the core wire 28 and is a portion inserted into the distal end portion of the proximal shaft 22.
- the proxy shaft 22 and the core wire 28 are fixed to each other.
- the distal end side of the core wire 28 extends from the proximal shaft 22 toward the distal end side, and is not fixed to the distal shaft 24 but is located in the supply / discharge lumen 18.
- the rigidity of the shaft 12 in the axial direction does not change suddenly at the connecting portion between the proxy shaft 22 and the distal shaft 24. Therefore, a decrease in kink resistance of the balloon catheter 10 can be avoided. It is also possible to give a change in the shaft 12 such that the rigidity gradually becomes flexible toward the tip side.
- the length that the core wire 28 extends is not particularly limited, and is set in consideration of the characteristics required for the shaft 12.
- the core wire 28 may have such a length that the tip does not reach the balloon 16 and remains in the middle portion of the distal shaft 24.
- the core wire 28 may have a length in which the distal end is located closer to the distal end side than the distal end of the distal shaft 24 and extends into the balloon 16.
- the shape of the core wire 28 can also be appropriately set in consideration of the characteristics required for the shaft 12.
- the core wire 28 may have a shape such that the cross-sectional area becomes gradually or gradually smaller toward the distal end side.
- the core wire 28 is formed of nitinol. Since the core wire 28 is made of nitinol, it is excellent in kink resistance as compared with a stainless steel core wire.
- the material of the core wire 28 is not particularly limited. In consideration of the characteristics required for the shaft 12 as described above, the length of the core wire 28, and the like, a strand made of a metal material such as stainless steel or a Ni—Ti alloy (naitinol) is preferably employed. Special
- FIGS. 2 to 3 show a connecting portion between the proxy shaft 22 and the distal shaft 24 to which the base end portion of the core wire 28 is fixed. After the proximal end portion of the core wire 28 is inserted and fixed at the distal end portion of the proxy shaft 22, the proximal end portion of the distal shaft 24 is externally attached and fixed. 4 to 5 show the joined state of the proxy shaft 22 and the core wire 28 before the distal shaft 24 is fixed.
- the cross section of the core wire 28 is circular.
- the outer diameter of the core wire 28 is substantially the same as or slightly smaller than the inner diameter of the proximal shaft 22.
- the proxy shaft 22 includes a notch 32.
- the notch 32 is a tip portion of the proximal shaft 22, and is a portion having an inclined end surface that is an inclined surface with respect to the central axis in a side view (see FIGS. 2 and 4).
- An inner hole of the proxy shaft 22 is opened over the entire length of the notch 32.
- the notch 32 is a portion extending in the length direction in an arcuate cross section.
- the insertion portion 30 of the core wire 28 is inserted into the notch 32 of the proxy shaft 22.
- the insertion portion 30 of the core wire 28 is located in the notch 32 of the proxy shaft 22.
- the proximal end of the core wire 28 is located in the notch 32.
- the core wire 28 does not reach the circular cross section where the notch 32 is not formed in the proxy shaft 22.
- an opening region 34 which is a region where the inner hole of the proxy shaft 22 is not blocked by the core wire 28, is formed in the proximal end portion of the cutout portion 32.
- the opening region 34 is a region formed between the proximal end of the notch 32 and the proximal end of the core wire 28.
- the opening region 34 secures a flow path for the supply / discharge lumen 18 that communicates from the inner hole of the proxy shaft 22 to the inner hole of the distal shaft 24.
- a plurality of fixing portions 36 are formed in the portion where the notch-like portion 32 of the proxy shaft 22 and the core wire 28 overlap.
- the plurality of fixing portions 36 are located at different locations in the circumferential direction around the central axis of the shaft 12 and in the central axis direction.
- Each fixing portion 36 is formed by locally projecting the peripheral wall portion of the notch-like portion 32 toward the inner peripheral side and biting the protruding portion into the outer peripheral surface of the core wire 28. That is, the proxy shaft 28 includes a protruding portion 33 that protrudes toward the inner peripheral side.
- the core wire 28 includes a recess 35 that is recessed toward the inner periphery.
- a fixing portion 36 is formed by the combination of the protruding portion 33 and the recessed portion 35.
- fixed part 36 contains the protrusion part 33 and the recessed part 35 (refer FIG. 3).
- the fixing portion 36 has a mechanical uneven fitting structure.
- the fixing portion 36 of the concave / convex fitting structure fitted in the radial direction of the shaft 12 has a large fixing force between the proxy shaft 22 and the core wire 28 in the circumferential direction or the axial direction of the shaft 12 intersecting the concave / convex direction. Demonstrate.
- the balloon catheter 10 is configured so that the joint between the proxy shaft 22 and the core wire 28 is not released by the fixing portion 36.
- the six fixing portions are alternately arranged on both sides of the opening of the notch-like portion 32 in the width direction.
- three fixing portions 36 are formed on one side surface of the notch-shaped portion 32 of the proxy shaft 22 with a predetermined distance in the axial direction.
- three fixing portions 36 are formed on the other side surface of the notch-shaped portion 32 of the proxy shaft 22 at a predetermined distance in the axial direction.
- the six fixing portions 36 formed on both side surfaces of the notch-like portion 32 of the proxy shaft 22 are disposed asymmetrically in the axial direction.
- the fixing portions 36 are alternately arranged in the length direction of the catheter 10 with the opening portions of the notched portions 32 sandwiched in the width direction.
- the proxy shaft 22 and the core wire 28 can be fixed more firmly than in the case where the number of the fixing portions 36 is one.
- the plurality of fixing portions 36 are formed by removing the opposing positions in the direction perpendicular to the axis. Thereby, the fall of the intensity
- the fixing portion 36 having such a concave-convex fitting structure may be formed by mechanical plastic processing using a punch or the like, for example. Specifically, the operator inserts the core wire 28 into the proximal shaft 22. An operator uses a punch or the like to project the notch 32 toward the inner periphery to form a projection. As the protruding portion bites into the core wire 28, a recess is formed in the core wire 28. The fixed portion 36 is formed by fitting the protruding portion into the concave portion. Moreover, the fixing
- the fixed portion 36 is formed by spot irradiation of the energy beam on the outer peripheral surface of the proxy shaft 22.
- the core wire 28 is inserted into a predetermined position of the notch 32 of the proxy shaft 22.
- the proxy shaft 22 and the core wire 28 are positioned and fixed.
- the energy beam is irradiated from the outside in the direction substantially perpendicular to the axis toward the position where the fixed portion 36 is formed on the outer peripheral surface of the proxy shaft 22.
- the irradiation part (spot irradiation part) of the proximal shaft 22 protrudes inward, and bites into the outer peripheral surface of the core wire 28, whereby the fixing part 36 having the concave-convex fitting structure can be formed.
- the energy beam a laser beam or an electron beam can be used, but a laser beam that does not need to be processed in a vacuum atmosphere is generally suitable to the extent that a shielding gas is used if necessary.
- the wavelength and intensity of the laser beam can be appropriately set in consideration of the materials of the proxy shaft 22 and the core wire 28, and are not particularly limited.
- the use of a solid-state laser such as a YAG laser or a gas laser such as a carbon dioxide laser is easy in terms of equipment.
- the processing position and processing strength can be set with high accuracy. Therefore, even at the joint between the proximal shaft 22 and the core wire 28 including the thin-walled and small-diameter processed portion having a large curvature, the fixed portion 36 having a spot-like uneven fitting structure is formed stably and with excellent mass productivity. It becomes possible.
- the fixing portion 36 that is energized by irradiation with a laser beam or the like and has an uneven fitting has a mechanical fixing structure. Therefore, even if the proxy shaft 22 and the core wire 28 are made of a material that cannot be directly welded to each other, it is possible to obtain an effective fixing strength at the joint. Therefore, in the balloon catheter 10 of the present embodiment, when selecting the material of the proximal shaft 22 and the core wire 28, it is not necessary to consider the condition of whether or not direct welding is possible, and a large degree of freedom of selection can be secured. .
- proximal shaft 22 and the core wire 28 made of a material that cannot be directly welded are employed, it is not necessary to interpose an intermediate member made of a material that can be welded to each member. Thereby, the complexity of the structure and the increase in the manufacturing process can be avoided.
- a YAG laser was used as the laser beam.
- the fixed portion 36 was formed by performing irradiation for 0.01 second in air at an output of 1.50 kW. Further, with respect to the notch-like portion 32 of the proximal shaft 22, a fixed portion 36 is formed by performing processing by laser irradiation under the same conditions at one place on one side and two places on the other side. did.
- proximal shaft 22 and the core wire 28 were fixed with sufficient strength for the obtained prototype. Thereafter, the proximal shaft 22 and the core wire 28 were forcibly separated with an external force exceeding the strength required for the product, and the state of the fixed portion 36 broken in both members was confirmed.
- the cutout portion 32 has an inclined end surface that is a surface inclined with respect to the central axis in a side view.
- the cutout portion 32 does not have to have an inclined end surface, and may be any portion that extends in the length direction in an arc-shaped cross section.
- the notch 32 may have an end surface parallel to the axial direction of the balloon catheter 10 in a side view.
- the cross-sectional shape perpendicular to the axial direction in the notch-shaped portion 32 is constant along the axial direction.
- the opening region 34 is formed, the flow path of the supply / discharge lumen 18 communicating from the inner hole of the proxy shaft 22 to the inner hole of the distal shaft 24 is secured.
- region 34 is formed in the base end side of the notch-shaped part 32, the opening area
- the opening that connects the inner hole of the proxy shaft 22 and the inner hole of the distal shaft 24 is a proxy. What is necessary is just to be formed in the round shaft 22. FIG.
- the proxy shaft 22 includes a stepped portion 38 and a small diameter cylindrical portion 40.
- the stepped portion 38 is a portion near the distal end of the proximal shaft 22 and is a portion whose inner and outer diameters decrease from the proximal end side toward the distal end side.
- the small-diameter cylindrical portion 40 is a portion that extends from the tip of the stepped portion 38 toward the tip of the proxy shaft 22 toward the tip.
- the diameter of the small diameter cylindrical portion 40 is substantially constant.
- the core wire 28 is inserted into the small diameter cylindrical portion 40.
- the length of the small diameter cylinder part 40 should just be a length required in order that the base end part of the core wire 28 may be inserted in the proxy shaft 22 and fixed.
- the length of the small-diameter cylindrical portion 40 is substantially the same as the length of the insertion portion 30 that is the insertion length to the proxy shaft 22 at the proximal end portion of the core wire 28.
- the small-diameter cylindrical portion 40 may be shorter or longer than the insertion length to the proxy shaft 22 at the proximal end portion of the core wire 28.
- a plurality of fixed portions 36 are formed by irradiating a laser beam or the like from the outer peripheral surface to the small diameter cylindrical portion 40 of the proxy shaft 22 into which the insertion portion 30 of the core wire 28 is inserted.
- the specific structure and forming method of the fixing portion 36 are the same as those in the above embodiment. Also, with respect to other parts, the same reference numerals as those in the above embodiment are given to the same parts as those in the above embodiment, and the detailed description is omitted.
- the inner diameter dimension of the small diameter cylindrical portion 40 is substantially the same as or slightly larger than the outer diameter dimension of the insertion portion 30 of the core wire 28. At least in the portion where the fixing portion 36 is formed, the small-diameter cylindrical portion 40 and the core wire 28 are in close contact with each other or are in contact with each other. The formation of 36 is performed more stably.
- a communication hole 42 penetrating the peripheral wall inward and outward is formed in the stepped portion 38 of the proxy shaft 22. It is sufficient that at least one communication hole 42 is formed.
- the communication hole 42 secures a flow path for the supply / discharge lumen 18 that communicates from the inner hole of the proxy shaft 22 to the inner hole of the distal shaft 24.
- the supply is performed on the outer peripheral side of the small-diameter cylindrical portion 40. The cross-sectional area of the exhaust lumen 18 is ensured.
- FIG. 9A when a core wire 28 having a sufficiently small outer diameter with respect to the inner diameter of the proxy shaft 22 is employed.
- FIG. 9B at the portion where the fixing portion 36 is formed, the peripheral wall of the proxy shaft 22 is partially deformed into a concave shape toward the inner peripheral side to form a concave deformation portion 44. It is desirable.
- the core wire 28 and the proxy shaft at an arbitrary position. It is possible to easily form the fixing portion 36 of the concave-convex fitting structure by using a laser beam or the like by bringing 22 close to each other.
- the concave deformation portion 44 as in this aspect, the design freedom of the radial dimensions of the proxy shaft 22 and the core wire 28 can be increased, and the flow passage cross-sectional area of the supply / discharge lumen 18 can be set. Ensuring and adjusting and setting the characteristics of the shaft 12 by the core wire 28 can be performed more easily.
- the tip portion of the proxy shaft 22 is the notched portion 32 of the inclined end surface as in the above embodiment.
- the tip portion of the proxy shaft 22 may not be a notch-shaped portion.
- the tip portion of the proximal shaft 22 may be a small-diameter cylindrical portion 40 as in the embodiment shown in FIGS.
- tip part of the proximal shaft 22 may be a cylindrical edge part extended by a fixed diameter dimension from the base end side, without being reduced in diameter.
- the core wire 28 may be fixed by forming a concave deformation portion 44 at the cylindrical end portion.
- the concave deformation portion 44 when forming the concave deformation portion 44 at the distal end portion of the proximal shaft 22, the concave deformation portion 44 is formed on the peripheral wall of the proximal shaft 22 in advance before inserting the proximal end portion of the core wire 28. It is also possible to form the concave deformed portion 44 in the proxy shaft 22 with the proximal end portion inserted.
- the small-diameter cylindrical portion 40 of the proxy shaft 22 of the embodiment shown in FIGS. 7 to 8 is, for example, in a state where the proximal end portion of the core wire 28 is inserted into the distal end portion of the proxy shaft 22. It may be formed by a diameter reducing process such as drawing with respect to.
- the diameter of the stepped portion 38 changes at a constant rate in the axial direction.
- the diameter of the stepped portion 38 may not change at a constant rate in the axial direction.
- the stepped portion 38 may have a curved side surface as viewed from the side, or may have a stepped side surface. Even in this case, the communication hole 42 only needs to be formed in the stepped portion 38 so that the inner hole of the distal shaft 24 and the inner hole of the proxy shaft 22 communicate with each other.
- the position and number of the fixing portions 36 between the proxy shaft 22 and the core wire 28 are not limited.
- a plurality of fixing portions 36 may be formed at different positions in the circumferential direction within the same cross section of the shaft.
- the plurality of fixing portions 36 may be formed with an arbitrary angle difference such as 90 degrees in the circumferential direction at a predetermined distance in the axial direction.
- the fixed portion 36 is formed only by irradiation with an energy beam.
- the fixing portion 36 may be formed by irradiating an energy beam after forming the predetermined protruding portion 33 and the concave portion 35 using a punch or the like.
- a low protrusion 33 is formed on the proxy shaft 22 using a punch or the like.
- a shallow recess 35 is formed in the core wire 28 in accordance with the formation of the low protrusion 33.
- the proxy shaft 22 and the core wire 28 are positioned by the low protrusion 33 and the shallow recess 35.
- the method of manufacturing the balloon catheter 10 includes a step of inserting the core wire 28 into the proximal shaft 22, a step of forming a protrusion on the proximal shaft 22 and a recess in the core wire 28, and an energy beam from the proximal shaft. 22 may be included.
- the plurality of protrusions 33 are formed in a portion where the notch 32 of the proxy shaft 22 and the core wire 28 overlap.
- the protruding portion 33 may not be formed in a portion where the cutout portion 32 and the core wire 28 overlap.
- the protruding portion 33 may be formed on the proximal end side with respect to the proximal end of the core wire 28. Since the protruding portion 33 protrudes so as to come into contact with the proximal end of the core wire 28, the core wire 28 is suppressed from moving toward the proximal end side.
- the catheter to which the present invention is applied is not limited to a balloon catheter, and can be applied to various catheters such as a penetration catheter.
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Abstract
Description
Claims (10)
- 第1の材料で形成されたプロキシマルシャフトと、
前記プロキシマルシャフトの先端部分に挿入された挿入部分を含むコアワイヤであって、前記第1の材料と直接溶接することが困難な第2の材料で形成されたコアワイヤと、
各々が、前記プロキシマルシャフトの前記先端部分から前記コアワイヤの前記挿入部分に向けて突出する突出部と、前記コアワイヤの前記挿入部分に形成された凹部と、を含む少なくとも一つの固定部とを備えることを特徴とするカテーテル。 - 前記少なくとも一つの固定部は、長さ方向の異なる位置に形成された複数の第1固定部である請求項1に記載のカテーテル。
- 前記少なくとも一つの固定部は、周方向の異なる位置に形成された複数の第2固定部である請求項1又は2に記載のカテーテル。
- 前記プロキシマルシャフトの前記先端部は、周上の一部で開放された円弧形断面で長さ方向に延びる切欠状部であり、
前記少なくとも一つの固定部は、夫々、前記切欠状部と前記コアワイヤの前記挿入部分とが重なる部分に形成されている請求項1~3の何れか一項に記載のカテーテル。 - 前記プロキシマルシャフトに接続されたディスタールシャフトを備え、
前記コアワイヤの基端側の端部と前記切欠状部の基端との間の領域であって、前記プロキシマルシャフトの第1ルーメンと前記ディスタールシャフトの第2ルーメンとを連通する領域である開口領域が形成されている請求項4に記載のカテーテル。 - 前記プロキシマルシャフトは、
基端側から先端側に向けて径が小さくなる部分である段差状部と、
前記段差状部の先端から、先端側に向けて延びる小径筒部と、を含み、
前記コアワイヤの前記挿入部分は前記小径筒部に挿入されており、
前記段差状部には、該プロキシマルシャフトの第1ルーメンを前記ディスタールシャフトの第2ルーメンに連通させる連通孔が形成されている請求項1~4の何れか一項に記載のカテーテル。 - 前記プロキシマルシャフトの先端側の内径は、前記コアワイヤの基端側の外径よりも所定量だけ大きく、
前記プロキシマルシャフトの先端側は、部分的に内周側へ凹状に変形されることで前記コアワイヤの基端側の外周面との間の隙間が小さくされた凹状変形部を含み、
前記少なくとも一つの固定部は、夫々、前記凹状変形部に前記コアワイヤとの間に形成されている請求項1~6の何れか一項に記載のカテーテル。 - 前記プロキシマルシャフトがステンレススチールで形成されており、
前記コアワイヤがナイチノールで形成されている請求項1~7の何れか一項に記載のカテーテル。 - カテーテルの製造方法であって、
第1の材料で形成されたプロキシマルシャフトの先端部に、前記第1の材料と直接溶接することが困難な第2の材料で形成されたコアワイヤの挿入部を挿入する挿入工程と、
前記プロキシマルシャフトの外周面を前記コアワイヤに向けて突出させることで、前記プロキシマルシャフトを局所的に前記コアワイヤの外周面に食い込ませる接合工程と、
を含むことを特徴とするカテーテルの製造方法。 - 前記接合工程は、エネルギービームをスポット状に照射する照射工程を含む請求項9に記載の製造方法。
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KR1020177022114A KR102051721B1 (ko) | 2015-02-24 | 2016-02-24 | 카테터 및 카테터의 제조 방법 |
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Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001095924A (ja) * | 1999-09-28 | 2001-04-10 | Terumo Corp | カテーテル |
JP2003164528A (ja) * | 2001-11-29 | 2003-06-10 | Nippon Sherwood Medical Industries Ltd | バルーンカテーテル |
JP2007503929A (ja) * | 2003-09-05 | 2007-03-01 | ボストン サイエンティフィック リミテッド | 体内で使用するための長尺状医療器具 |
US20070167877A1 (en) * | 2006-01-17 | 2007-07-19 | Euteneuer Charles L | Medical catheters and methods |
JP2010201027A (ja) * | 2009-03-04 | 2010-09-16 | Goodman Co Ltd | 医療用シャフト及び医療用器具 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7625337B2 (en) * | 2003-01-17 | 2009-12-01 | Gore Enterprise Holdings, Inc. | Catheter assembly |
US8409114B2 (en) * | 2007-08-02 | 2013-04-02 | Boston Scientific Scimed, Inc. | Composite elongate medical device including distal tubular member |
JP5743270B2 (ja) | 2011-07-13 | 2015-07-01 | 朝日インテック株式会社 | カテーテル |
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2016
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001095924A (ja) * | 1999-09-28 | 2001-04-10 | Terumo Corp | カテーテル |
JP2003164528A (ja) * | 2001-11-29 | 2003-06-10 | Nippon Sherwood Medical Industries Ltd | バルーンカテーテル |
JP2007503929A (ja) * | 2003-09-05 | 2007-03-01 | ボストン サイエンティフィック リミテッド | 体内で使用するための長尺状医療器具 |
US20070167877A1 (en) * | 2006-01-17 | 2007-07-19 | Euteneuer Charles L | Medical catheters and methods |
JP2010201027A (ja) * | 2009-03-04 | 2010-09-16 | Goodman Co Ltd | 医療用シャフト及び医療用器具 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2020019054A (ja) * | 2018-08-03 | 2020-02-06 | オリンパス株式会社 | レーザー溶接構造、およびレーザー溶接方法 |
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JP6978937B2 (ja) | 2021-12-08 |
JPWO2016136767A1 (ja) | 2017-11-30 |
CN107206206B (zh) | 2020-09-18 |
KR102051721B1 (ko) | 2019-12-03 |
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