JP2013090820A - Dilation catheter - Google Patents

Abstract

An expandable catheter that is excellent in pushability and easily passes through a lesion or the like.
An expansion catheter includes a flexible long catheter body, an expandable and contractible or foldable expansion body provided on the catheter body, and the expansion body disposed on the catheter body. And the reinforcing body 15 attached to the extended body arranging section 122 and extending from the expanded body arranging section to the base end side, and the reinforcing body does not come off the expanded body arranging section and is attached to the expanded body arranging section. It is attached to the expansion body arrangement | positioning part so that it can advance / retreat along.
[Selection] Figure 1

Description

  The present invention relates to a dilatation catheter used for improving a stenosis or occlusion occurring in a blood vessel or the like.

  Currently, a treatment for expanding a stenosis or occlusion in a blood vessel with a catheter is widely performed. The operator advances the catheter percutaneously inserted into the blood vessel to a lesion such as a stenosis or occlusion, and widens the lesion by an expansion body such as a balloon passed through the lesion.

  Since the catheter advances when the pushing force is transmitted from the proximal end side to the distal end side, a property that can transmit the pushing force from the proximal end side to the distal end side, so-called pushability is required. For example, in the balloon catheter disclosed in Patent Document 1, the metal core wire is fixed to the balloon catheter inside the balloon disposed near the distal end of the balloon catheter and extends to the proximal side of the balloon catheter. Therefore, the pushing force is easily transmitted from the proximal end side to the distal end side.

Japanese Patent No. 4249150

  However, when the core wire is fixed inside the balloon as in the above prior art, the rigidity of the core wire causes the balloon to pass through a curved curved portion or a branched branch portion in a luminal organ such as a lesion or blood vessel. Since it is difficult to deform in accordance with these, the contact resistance increases between these lesions and the like, and it is thus difficult for the balloon to pass through the lesions and the like.

  The present invention has been made to solve such problems, and an object of the present invention is to provide a dilatation catheter that is excellent in pushability and easily passes through a lesion or the like.

  In order to achieve the above object, an expansion catheter includes an elongated catheter body having flexibility, an expandable and contractible or foldable expansion body provided on the catheter body, and the expansion body in the catheter body. And a reinforcing body that extends to the base end side from the expansion body arrangement portion, and the reinforcement body does not come off from the expansion body arrangement portion and the expansion It is attached to the said expansion body arrangement | positioning part so that advance / retreat is possible along a body arrangement | positioning part.

  In the dilatation catheter configured as described above, the reinforcing body is attached so as not to be disengaged from the expansion body arranging portion, so that the pushing force is easily transmitted from the proximal end side to the distal end side, and the reinforcing body is advanced and retracted. Since the expansion body is attached to the expansion body arrangement part as possible, the position of the reinforcement body in the expansion body arrangement part can be changed so that the expansion body easily deforms in accordance with the lesion part when passing through the lesion part. As a result, contact resistance between the expanded body and the lesioned part is suppressed. Therefore, the dilatation catheter configured as described above is excellent in pushability and easily passes through a lesioned part or the like.

  Further, if the reinforcing body is attached to the expansion body arrangement portion so as to be rotatable around the expansion body arrangement portion, the position of the reinforcement body in the expansion body arrangement portion can be changed more freely. When the expansion body passes through the lesioned part or the like, it becomes easier to deform in accordance with the lesioned part or the like, so that the expansion body more easily passes through the lesioned part or the like.

  Further, the catheter body has a tubular body constituting the expansion body arranging portion, and the reinforcing body is slidably arranged around the tubular body, and is a cross section orthogonal to the axial direction of the tubular body. Is attached to the expansion body arrangement part by being attached to the annular body having a ring shape, the reinforcing body is attached so as not to be detached from the expansion body arrangement part by the annular body. Is easily transmitted from the proximal end side to the distal end side. In addition, the reinforcing body can be moved together with the annular body in the expanded body placement section so that the expanded body can be easily deformed in accordance with the lesioned section when passing through the lesioned section. Contact resistance is suppressed. Therefore, the dilatation catheter configured as described above is excellent in pushability and easily passes through a lesioned part or the like.

  In addition, when the base end of the reinforcing body is fixed, the base end of the reinforcing body is fixed if the base end of the reinforcing body advances and retreats following the portion attached to the expansion body arranging portion and rotates. Since the reinforcement body can move more freely than the expansion body, when the expansion body passes through the lesioned part or the like, it becomes easier to deform in accordance with the lesioned part or the like, so that the expansion body further passes through the lesioned part or the like.

  The catheter body includes an outer tube in which the tubular body is disposed, and a proximal shaft having a hollow shape that is connected to the proximal end of the outer tube and communicates with the outer tube. If the reinforcing body extends from the expansion body arrangement portion to the inside of the proximal shaft through the outer tube and is fixed to the inner surface of the proximal shaft, the pushing force applied to the proximal shaft is reduced. It is easy to be transmitted from the proximal end side to the distal end side through the reinforcing body.

  Further, the proximal end of the tubular body penetrates from the inside of the outer tube to the outer periphery of the outer tube and communicates with the outside of the outer tube, and the reinforcing body includes an axis of the proximal end shaft and the In the outer tube, in the cross section passing through the penetrating portion through which the proximal end of the tubular body passes, the inner portion of the proximal shaft located on the opposite side of the penetrating portion with respect to the axial center of the proximal shaft, or the inner portion from the inner portion If the base end shaft is fixed to the inner surface of the base end shaft extending within 90 ° around the axis of the base end shaft, it becomes difficult for the reinforcing body and the tubular body to come into contact with each other. It is easy to move.

It is a figure which shows the balloon catheter of embodiment. It is sectional drawing which expands and shows the front-end | tip vicinity of the balloon catheter of embodiment. It is sectional drawing which shows a mode that the position of the reinforcement body of embodiment changes. FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. It is sectional drawing which expands and shows the base end vicinity of a reinforcement body. It is sectional drawing which expands and shows the front-end | tip vicinity of the balloon catheter of a modification. It is sectional drawing which expands and shows the front-end | tip vicinity of the balloon catheter of another modification. It is sectional drawing which follows the 8-8 line of FIG. It is a figure which shows the balloon catheter of another modification. FIG. 10 is an enlarged cross-sectional view of a fixing portion between a proximal shaft and a reinforcing body in the balloon catheter shown in FIG. 9. It is sectional drawing which follows the 11-11 line of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted. The dimensional ratios in the drawings are exaggerated for convenience of explanation, and are different from the actual ratios.

  As shown in FIG. 1, a balloon catheter 10 (expansion catheter) according to an embodiment includes a long catheter body 11 having flexibility, and a balloon 14 (expansion body) provided close to the distal end of the catheter body 11. And a hub 18 provided at the proximal end of the catheter body 11. The balloon catheter 10 includes a reinforcing body 15 that is provided on the catheter body 11 and transmits a pushing force from the proximal end side to the distal end side.

  The catheter body 11 has a distal shaft 12 and a proximal shaft 13 that are aligned in the axial direction and joined to each other. The distal end shaft 12 includes a flexible outer tube 121 and a flexible inner tube 120 (tubular body) disposed inside the outer tube 121.

  The material forming the outer tube 121 is, for example, polyamide, polyester, polyamide elastomer, polyester elastomer, polyolefin (for example, polyethylene, polypropylene, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, and cross-links or parts thereof) Cross-linked product), thermoplastic resins such as polyvinyl chloride and polyurethane. The inner tube 120 is also formed of the same material as the outer tube 121, for example.

  The distal end of the inner tube 120 protrudes from the distal end of the outer tube 121. The proximal end of the inner tube 120 penetrates from the inside of the outer tube 121 to the outer periphery of the outer tube 121 and communicates with the outside of the outer tube 121 at the center in the axial direction of the catheter body 11 or on the distal side. A guide wire GW can be inserted into the inner tube 120. The guide wire GW inserted from the proximal end of the inner tube 120 exits from the distal end of the inner tube 120. The balloon catheter 10 is a so-called rapid exchange type in which a guide wire GW is inserted from the side surface of the catheter body 11.

  The balloon 14 is disposed on the protruding portion 122 (expanded body arranging portion) that protrudes from the tip of the outer tube 121 in the inner tube 120. The balloon 14 is provided so as to surround the protrusion 122. The balloon 14 is joined to the outer periphery of the projecting portion 122 near the tip of the projecting portion 122, and is joined to the outer periphery of the outer tube 121 near the tip of the outer tube 121. Such bonding is, for example, fusion (specifically, thermal fusion, high-frequency fusion, ultrasonic fusion) or adhesion with an adhesive. The inside of the balloon 14 communicates with the outer tube 121. The balloon 14 is in a contracted or folded state on the outer periphery of the protrusion 122 before being expanded.

  The balloon 14 has flexibility. Examples of the material for forming the balloon 14 include thermoplastic resins such as polyolefin, polyvinyl chloride, polyamide, polyamide elastomer, polyester elastomer, polyurethane, polyester, and polyarylene sulfide, silicone rubber, latex rubber, and the like.

  Markers 123 and 124 having contrast properties are arranged on the protrusion 122. In the present embodiment, the two markers 123 and 124 are arranged apart from each other. The markers 123 and 124 have a ring shape. The markers 123 and 124 are fixed to the protrusion 122 while being fitted thereto. The markers 123 and 124 have, for example, X-ray contrast properties or ultrasonic contrast properties. The contrast material contained in the markers 123 and 124 is, for example, a contrast metal such as platinum or platinum alloy, or gold or gold alloy, or a contrast agent such as barium sulfate, bismuth oxide, or tungsten powder. The positions of the markers 123 and 124 in the body can be confirmed by X-ray imaging or the like.

  The proximal shaft 13 is inserted and joined to the proximal end of the outer tube 121. The proximal shaft 13 has a lumen (not shown) penetrating in the axial direction. The proximal shaft 13 and the outer tube 121 are in communication.

  The proximal shaft 13 has flexibility. Further, the proximal shaft 13 has relatively high rigidity compared to the distal shaft 12. The material forming the proximal shaft 13 is, for example, polyolefin (for example, polyethylene, polypropylene, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, etc.), polyvinyl chloride, polyamide, polyamide elastomer, polyester, polyester elastomer. , Thermoplastic resins such as polyimide and polyurethane, silicone rubber, latex rubber and the like. Further, the proximal shaft 13 may be made of a metal such as stainless steel or a superelastic alloy.

  The hub 18 is fixed to the proximal shaft 13 and communicates with the proximal shaft 13. The hub 18 can be connected to a balloon expansion device (not shown) such as a syringe. The working fluid supplied from the balloon expansion device flows into the balloon 14 through the hub 18, the proximal shaft 13, and the outer tube 121. The balloon 14 is expanded by the inflow of the working fluid into the balloon 14. On the other hand, the working fluid in the balloon 14 is extracted by the balloon dilating device through the outer tube 121, the proximal shaft 13, and the hub 18, so that the balloon 14 is deflated or folded. The working fluid is preferably a liquid. The working fluid is, for example, an X-ray contrast medium diluted with physiological saline.

  The material for forming the hub 18 is not particularly limited, and for example, resin materials such as polyvinyl chloride, polyethylene, polypropylene, polycarbonate, polymethyl methacrylate, acrylonitrile-styrene-butadiene copolymer, and various types such as stainless steel and titanium. It is a metal material.

  The reinforcing body 15 is based on, for example, one wire or a plurality of wires. The rigidity of the reinforcing body 15 is preferably greater than or equal to the rigidity of the inner tube 120. The material for forming the reinforcing body 15 is, for example, stainless steel wire, piano wire, superelastic alloy wire, Ni-Ti alloy, Cu-Zn alloy, Ni-Al alloy, tungsten, tungsten alloy, titanium, titanium alloy, It is a wire formed of various metals such as cobalt alloy and tantalum. Further, the forming material of the reinforcing body 15 may be a resin having relatively high rigidity.

  The reinforcing body 15 is attached to the projecting portion 122 by a reinforcing body attaching portion 16 (annular body) slidably disposed around the projecting portion 122, and extends from the projecting portion 122 to the base end side. The reinforcing body 15 is attached to the protruding portion 122 so as to be able to advance and retreat along the protruding portion 122 and not to be detached from the protruding portion 122. The reinforcing body 15 is attached to the proximal end shaft 13 by a reinforcing body attaching portion 17 provided on the proximal end shaft 13. The reinforcing body 15 is attached to the proximal end shaft 13 so as to be able to advance and retreat along the axial distal end portion 130 of the proximal end shaft 13 and not to be detached from the distal end portion 130.

  As shown in FIG. 2, the reinforcing body mounting portion 16 has an insertion portion 160 in which the reinforcing body 15 is inserted. The distal end 150 of the reinforcing body 15 is inserted into the insertion portion 160. The reinforcing body 15 is sandwiched between the reinforcing body attaching portion 16 and the protruding portion 122 and attached to the protruding portion 122. The reinforcing body 15 and the reinforcing body mounting portion 16 interfere with each other and transmit force to the protruding portion 122.

  The insertion portion 160 extends along the protruding portion 122. The reinforcing body 15 can be advanced and retracted along the protruding portion 122 by the insertion portion 160. In the insertion portion 160, communication with the outside is blocked except for the opening portion 161 from which the reinforcing body 15 is drawn, and the spherical tip 150 of the reinforcing body 15 is caught by the reinforcing body mounting portion 16 at the opening portion 161. The reinforcing body 15 does not come off from the reinforcing body mounting portion 16. The distal end 150 of the reinforcing body 15 has a diameter larger than the gap around the protruding portion 122 in the opening 161, and is thus caught by the reinforcing body attaching portion 16 at the opening 161.

  The reinforcing body attaching portion 16 is attached to the protruding portion 122 so as to be able to advance and retract. The reinforcing body 15 can be advanced and retracted together with the reinforcing body attaching portion 16. Since the reinforcing body attaching portion 16 is caught by the markers 123 and 124 and stopped, movement of the reinforcing body attaching portion 16 and the reinforcing body 15 to the distal end side and the proximal end side from the protruding portion 122 is prevented. That is, the markers 123 and 124 function as stoppers that prevent the reinforcing body attachment portion 16 and the reinforcing body 15 from being detached from the protruding portion 122.

  When the rigidity of the reinforcing body 15 and the inner tube 120 is different, for example, as the balloon catheter 10 advances while being bent many times toward the target lesion in the blood vessel, for example, the difference in the curvature of the reinforcing body 15 and the inner tube 120 is caused. As a result, the position of the reinforcing body 15 with respect to the protrusion 122 is likely to change. For example, when the rigidity of the reinforcing body 15 is larger than the rigidity of the inner tube 120, the reinforcing body 15 is easily bent with a smaller curvature than the inner tube 120, and thus the balloon catheter 10 is bent many times toward the target lesion. As it progresses, it is assumed that the reinforcing body 15 moves to the proximal end side with respect to the protruding portion 122 as shown in order in FIGS. However, even if the reinforcing body 15 moves in this manner, the marker 124 prevents the reinforcing body attaching portion 16 and the reinforcing body 15 from being detached from the protruding portion 122.

  As shown in FIG. 4, in the reinforcing body attaching portion 16, the cross section perpendicular to the axial direction of the protruding portion 122 has an annular shape, and the opening 161 and the insertion portion 160 are arranged around the protruding portion 122. It is formed all around. For this reason, the reinforcing body 15 can rotate around the protrusion 122.

  As shown in FIG. 5, the reinforcing body mounting portion 17 has an insertion portion 170 in which the reinforcing body 15 is inserted. A base end 151 of the reinforcing body 15 is inserted into the insertion portion 170. The reinforcing body 15 is sandwiched between the reinforcing body attaching portion 17 and the distal end portion 130 of the proximal shaft 13 and attached to the distal end portion 130.

  The insertion portion 170 extends along the distal end portion 130. The reinforcing body 15 can be advanced and retracted along the distal end portion 130 at the insertion portion 170. In the insertion portion 170, communication with the outside is blocked except for the opening portion 171 from which the reinforcing body 15 is drawn, and the spherical base end 151 of the reinforcing body 15 is caught by the reinforcing body mounting portion 17 at the opening portion 171. Therefore, the reinforcing body 15 cannot be detached from the reinforcing body attaching portion 17. Since the base end 151 of the reinforcing body 15 has a larger diameter than the gap around the distal end portion 130 in the opening 171, the base end 151 is caught by the reinforcing body mounting portion 17 at the opening 171.

  The reinforcing body attaching portion 17 is attached to the distal end portion 130 so as to be able to advance and retreat. The reinforcing body 15 can move forward and backward together with the reinforcing body attaching portion 17. A stopper 131 provided at the distal end portion 130 and a tapered portion 132 having a diameter larger than the distal end portion 130 in the axial direction proximal end side, the reinforcing body mounting portion 17 and the reinforcing body on the distal end side and proximal end side from the distal end portion 130. Since the movement of 15 is prevented, they do not come off from the tip portion 130.

  Also in the reinforcing body attaching portion 17, like the reinforcing body attaching portion 16, the insertion portion 170 and the opening portion 171 are formed around the tip portion 130 over the entire circumference. Can be rotated around.

  The base end 151 of the reinforcing body 15 moves back and forth as the front end 150 of the reinforcing body 15 moves back and forth. Further, the base end 151 of the reinforcing body 15 rotates as the distal end 150 of the reinforcing body 15 rotates.

  Next, as an example of a method of using the balloon catheter 10, a method of using the balloon catheter 10 in the case of expanding a lesioned part such as a stenosis part or an obstruction part generated in a blood vessel will be described. The blood vessel is, for example, the coronary artery or lower limb artery of the heart.

  In general, the method of using the balloon catheter 10 includes an insertion step in which the balloon catheter 10 is advanced to the lesion, and an expansion step in which the balloon 14 is expanded at the lesion after the insertion step.

  In the insertion step, the operator introduces the guide wire GW into the blood vessel through a hollow needle punctured into the blood vessel, and then inserts the balloon catheter 10 percutaneously into the blood vessel along the guide wire GW. To do. The surgeon advances the balloon catheter 10 along the guide wire GW by passing the preceding guide wire GW through the inner tube 120 and pushing the balloon catheter 10 from the proximal end side to the distal end side. The surgeon advances the balloon catheter 10 to the target lesion while confirming the positions of the markers 123 and 124 under fluoroscopy.

  In the expansion process, the operator expands the balloon 14 by supplying a working fluid into the balloon 14 with the balloon 14 being passed through the lesion. The surgeon supplies a working fluid into the balloon 14 through a proximal shaft 13 and an outer tube 121 from a balloon expansion device (not shown) connected to the hub 18. The expanded balloon 14 expands the lesion.

  After the expansion process, the operator contracts the balloon 14 by extracting the working fluid from the balloon 14 with a balloon expansion device (not shown) connected to the hub 18. After the balloon 14 is deflated, the operator removes the balloon catheter 10 from the blood vessel, and then removes the guide wire GW.

  The effect of the balloon catheter 10 of this embodiment is described.

  In the balloon catheter 10, since the reinforcing body 15 is attached so as not to be detached from the protruding portion 122, the pushing force is easily transmitted from the proximal end side to the distal end side. In addition, since the reinforcing body 15 is attached to the projecting portion 122 so as to be able to advance and retreat, when the balloon 14 passes through a curved portion or a branched branch portion in a lesioned portion or a luminal organ such as a blood vessel, these The reinforcing body 15 can change the position of the protruding portion 122 so that the balloon 14 is easily deformed in accordance with the lesioned part, and as a result, the contact resistance between the balloon 14 and the lesioned part is suppressed. Therefore, the balloon catheter 10 is excellent in pushability and easily passes through a lesioned part or the like.

  Further, since the reinforcing body 15 is attached to the projecting portion 122 so as not to be detached from the projecting portion 122, it is possible to prevent the balloon 14 that is easily subjected to resistance when passing through a lesioned portion or the like from being bent.

  In addition, since the reinforcing body 15 is attached to the protruding portion 122 so as to be rotatable around the protruding portion 122, the position of the reinforcing body 15 in the protruding portion 122 can be changed more freely. When passing through, the balloon 14 is more likely to be deformed in accordance with the lesioned part and the like, so the balloon 14 is more likely to pass through the lesioned part and the like.

  Further, the base end 151 of the reinforcing body 15 moves forward and backward following the front end 150 of the reinforcing body 15 and rotates, so that the reinforcing body 15 can move more freely than when the base end 151 is fixed. Therefore, when the balloon 14 passes through the lesioned part or the like, the balloon 14 is more easily deformed in accordance with the lesioned part or the like.

  The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims.

  For example, the reinforcing body only needs to be attached to the expansion body arrangement portion so as not to be detached from the expansion body arrangement portion and to be able to advance and retreat along the expansion body arrangement portion. Therefore, as shown in FIG. The reinforcing body attaching portion 16 may be changed to another reinforcing body attaching portion 16A.

  The reinforcing body attaching portion 16A is an annular member fitted to the protruding portion 122 so as to be able to advance and retract. Further, the reinforcing body attaching portion 16A is rotatable around the protruding portion 122. The reinforcing body 15 is attached to the protruding part 122 via the reinforcing body attaching part 16A by being fixed to the inner periphery of the reinforcing body attaching part 16A at the tip 150. The reinforcing body 15 moves forward and backward together with the reinforcing body attaching portion 16A and rotates. When the tip 150 of the reinforcing body 15 is caught by the markers 123 and 124, the reinforcing body 15 is prevented from being detached from the protrusion 122.

  Moreover, as shown in FIG. 7, you may change the reinforcement body attaching part 16 in the said embodiment into another reinforcement body attaching part 16B. The reinforcing body mounting portion 16 </ b> B has a through hole 160 </ b> B extending along the protruding portion 122. The reinforcing body 15 is inserted into the through hole 160B, and can advance and retreat along the protruding portion 122 through the through hole 160B. The through hole 160B has a tapered shape that decreases in diameter toward the base end side. The diameter of the opening on the base end side in the through hole 160 </ b> B is smaller than the diameter of the tip 150 of the reinforcing body 15. Accordingly, since the distal end 150 is caught by the opening on the proximal end side in the through hole 160B, the reinforcing body 15 is prevented from coming off from the reinforcing body attaching portion 16B in the proximal direction. Further, since the reinforcing body 15 is attached to the base shaft 13 at the base end 151 as described in the above embodiment, it is prevented from coming off from the reinforcing body attaching portion 16B in the distal direction.

  As shown in FIG. 8, in the reinforcing body attaching portion 16 </ b> B, the cross section perpendicular to the axial direction of the protruding portion 122 has a ring shape, and the through hole 160 </ b> B is formed around the protruding portion 122. Therefore, the reinforcing body 15 can move so as to rotate around the protrusion 122. The reinforcing body attaching portion 16B is attached to the protruding portion 122 so as to be able to advance and retract. Since the reinforcing body mounting portion 16B is caught by the markers 123 and 124 and stopped, the movement of the reinforcing body mounting portion 16B to the distal end side and the proximal end side from the protruding portion 122 is prevented.

  The expansion body is not limited to a balloon, and may be a net-like member that expands and contracts around the catheter body such as a stent, or a linear member that expands and contracts around the catheter body in the circumferential direction. May be.

  The balloon catheter is not limited to the rapid exchange type as in the above embodiment, but may be an over-the-wire type in which the lumen through which the guide wire is inserted extends from the distal end to the proximal end of the catheter body.

  Moreover, in the said embodiment, although the reinforcement body 15 can be advanced or retracted along the protrusion part 122 and can rotate around the protrusion part 122, it is not limited to this. That is, the reinforcing body 15 can move forward and backward along the protrusion 122, but includes a form that does not rotate around the protrusion 122.

  In the above embodiment, the reinforcing body mounting portion 16 moves forward and backward along the protruding portion 122, but the reinforcing body mounting portion 16 may be fixed to the protruding portion 122. In this case, the reinforcing body 15 moves forward and backward along the protruding portion 122 at the insertion portion 160.

  Moreover, in the said embodiment, although the reinforcement body 15 advances / retreats between the markers 123 and 124, it is not limited to this. In other words, the reinforcing body only needs to advance and retract within a range that does not deviate from the expansion body arrangement portion. In the above embodiment, the reinforcing body 15 may advance and retract from end to end of the protruding portion 122.

  Further, in the above-described embodiment, there may be a state in which the reinforcing body attaching portion 17 is not provided and the base end 151 of the reinforcing body 15 can freely move within the outer tube 121. Further, a reinforcing body attaching portion may be provided in the hub 18 so that the reinforcing body moves forward and backward together with the reinforcing body attaching portion in the hub.

  The balloon catheter is not limited to that used in blood vessels, and may be used in other luminal organs such as the bile duct, esophagus, trachea, urethra, and gastrointestinal tract.

  Further, the base end 151 of the reinforcing body 15 may be fixed in the base end shaft 13 or the hub 18, for example. Further, unlike the embodiment 10C, a reinforcing body 15C having no proximal end 151 is fixed to the inner surface of the tubular proximal shaft 13C at the outer periphery in the vicinity of the proximal end, like the catheter 10C of the modified example shown in FIG. It may be.

  The reinforcing body 15C is different from the reinforcing body 15 of the above-described embodiment in that it does not have a spherical base end 151. However, the reinforcing body 15C can be advanced and retracted so as not to be detached from the protruding portion 122 by other points, for example, the reinforcing body mounting portion 16. The reinforcing body 15 </ b> C is the same as the reinforcing body 15 with respect to being attached to the protrusion 122. Further, the proximal shaft 13C is not reduced in diameter toward the distal end in the axial direction as in the above embodiment, and has a substantially constant outer diameter in the axial direction. Except for this, the proximal shaft 13C is the same as the proximal shaft 13 of the above embodiment. Further, except for the reinforcing body 15C and the proximal shaft 13C, the modified catheter 10C is substantially the same as the catheter 10 of the above-described embodiment.

  In this modification, the reinforcing body 15C extends from the protrusion 122 to the inside of the proximal shaft 13C through the outer tube 121 and is fixed to the inner surface of the proximal shaft 13C. Here, as shown in FIG. 10, the reinforcing body 15 </ b> C includes the axial center SC of the proximal shaft 13 </ b> C, and the axial center SC in a cross section passing through the through portion 125 through which the proximal end of the inner tube 120 passes in the outer tube 121. On the other hand, it is fixed to the inner portion 130 </ b> C of the proximal shaft 13 </ b> C located on the opposite side of the through portion 125. The reinforcing body 15C is fixed to the inner portion 130C with an adhesive, for example, on the outer periphery near the base end.

  Since the reinforcing body 15C is fixed to the proximal end shaft 13C, the pushing force applied to the proximal end shaft 13C is easily transmitted from the proximal end side to the distal end side via the reinforcing body 15C. In addition, the reinforcing body 15C is fixed to the proximal shaft 13C at the inner portion 130C, so that the reinforcing body 15C and the inner tube 120 are difficult to contact with each other, so that the distal end of the reinforcing body 15C moves relative to the inner tube 120. easy.

  In the present modification, the reinforcing body 15C is fixed to the proximal shaft 13C by the inner portion 130C, but is not limited to this. As shown in FIG. 11, the reinforcing body 15C may be fixed to the inner surface 131C of the proximal shaft 13C that extends from the inner portion 130C around the axis SC of the proximal shaft 13C within a range of 90 ° or less. By being fixed in this manner, the reinforcing body 15C and the inner tube 120 are less likely to come into contact with each other, so that the tip of the reinforcing body 15C is easily moved with respect to the inner tube 120.

10, 10C balloon catheter (expansion catheter),
11, 11C catheter body,
12 Tip shaft,
120 inner tube (tubular body),
121 outer pipe,
122 projecting part (expanded body arrangement part),
123, 124 markers,
125 penetrations,
13, 13C proximal shaft,
130 distal end of the proximal shaft,
131 stopper,
132 taper part,
130C An inner portion of the proximal shaft that is located on the opposite side of the penetrating portion with respect to the axial center of the proximal shaft,
131C, an inner surface extending from the inner portion of the proximal shaft within a range of 90 ° around the axial center of the proximal shaft,
14 Balloon (expanded body),
15, 15C reinforcement,
150 The front end of the reinforcing body (the part attached to the expansion body arranging portion in the reinforcing body),
151 the proximal end of the reinforcement,
16, 16A, 16B Reinforcing body mounting portion (annular body),
17 Reinforcing body mounting part,
GW guide wire,
SC axis.

Claims (6)

A long catheter body having flexibility;
An expandable and contractible or foldable expansion body provided on the catheter body;
A reinforcement body attached to the expansion body arrangement portion where the expansion body is arranged in the catheter body and extending from the expansion body arrangement portion to the proximal end side, and
The dilatation catheter is attached to the expansion body placement section so that the reinforcement body does not come off from the expansion body placement section and is capable of moving back and forth along the expansion body placement section.   The dilatation catheter according to claim 1, wherein the reinforcing body is attached to the dilation body arrangement portion so as to be rotatable around the dilation body arrangement portion.   The catheter body has a tubular body that constitutes the expansion body arranging portion, and the reinforcing body is slidably disposed around the tubular body, and a cross section perpendicular to the axial direction of the tubular body is a ring. The dilatation catheter according to claim 1 or 2, wherein the dilatation catheter is attached to the dilation body placement portion by being attached to an annular body having a shape.   The base end of the said reinforcement body follows the part attached to the said expansion body arrangement | positioning part in the said reinforcement body, and advances and retreats, It rotates, The rotation of any one of Claims 1-3. Dilatation catheter. The catheter body includes an outer tube in which the tubular body is disposed, and a proximal shaft having a hollow shape connected to the proximal end of the outer tube and communicated with the outer tube,
The dilatation catheter according to claim 3, wherein the reinforcing body extends from the expansion body arrangement portion to the inside of the proximal shaft through the outer tube and is fixed to an inner surface of the proximal shaft. The proximal end of the tubular body penetrates from the inside of the outer tube to the outer periphery of the outer tube and communicates with the outside of the outer tube,
The reinforcing body includes an axial center of the proximal shaft, and in a cross section passing through a penetration portion through which the proximal end of the tubular body penetrates in the outer tube, on the opposite side to the penetration portion with respect to the axial center of the proximal shaft. 6. The expansion according to claim 5, wherein the extension is fixed to an inner portion of the proximal shaft that is located, or an inner surface of the proximal shaft that extends from the inner portion within a range of 90 degrees around an axis of the proximal shaft. catheter.

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