JP2015217216A - catheter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a catheter having a simple configuration, capable of excising an embolus of a blood vessel and acquiring an image of the blood vessel by an OCT.SOLUTION: A catheter 10 includes: a shaft 11 having an opening 20 at a part of a lateral wall at a distal side; a cutter 12 located near the opening 20 in an internal space of the shaft 11, and capable of moving in an axial direction 101 of the shaft 11; a torque shaft 16 inserted into the internal space of the shaft 11 and transmitting rotation torque to the cutter 12; an OCT image wire 17 provided along the torque shaft 16; a reflection material 18 reflecting near-infrared ray excited from the OCT image wire 17 in a direction crossing with the axial direction 101; and a balloon 23 disposed at an opposite side of the opening 20 with respect to the axial line of the shaft 11 and inflating outward from the lateral wall of the shaft 11.

Description

  The present invention relates to a catheter that is inserted into a blood vessel to remove an embolus attached to the inner wall of the blood vessel.

  Conventionally, a treatment for removing an embolus generated in a blood vessel by inserting a catheter into the blood vessel has been performed. Whether or not an embolus is present in the blood vessel can be image-inspected by, for example, optical coherence tomography (hereinafter also referred to as “OCT”) (see Patent Document 1).

  In order to excise the embolus found in the blood vessel, an embolectomy catheter is used in which the embolus is excised with a cutter through the opening in the side wall. When the embolectomy catheter is inserted into the blood vessel until the opening faces the embolus, and the balloon provided near the opening is expanded, the opening is brought closer to the embolus, and the embolus is inserted into the lumen of the embolectomy catheter through the opening. enter in. A cutter is provided in the lumen of the embolectomy catheter so as to be movable in the axial direction. The cutter is driven and transmitted from the motor and rotated in the lumen. The embolus that has entered the lumen is excised by moving through the lumen while the cutter is rotating. The excised embolus is accommodated in the lumen of the embolectomy catheter (Patent Documents 2 and 3).

Special table 2008-523554 JP-A-6-30943 JP-A-5-56984

  In the above-described embolectomy, in order to align the position of the embolus with the opening of the embolectomy catheter, an image inspection by OCT is performed before the excision. Thereafter, the embolus is excised with an embolectomy catheter. Further, after the embolectomy, an image inspection by OCT is performed again in order to confirm the state of the blood vessel. If it is determined that the embolus has not been sufficiently removed, the remaining embolus is removed again by the embolectomy catheter, and then the state of the blood vessel is confirmed again. In such an operation, a catheter for OCT and an embolectomy catheter are alternately inserted into a blood vessel, and the operation is likely to be complicated.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a catheter having a simple structure capable of excising a blood vessel embolus and obtaining a blood vessel image by OCT. is there.

  (1) The catheter according to the present invention is located near the opening in the inner space of the tubular body having an opening in a part of the side wall on the distal end side, and is movable in the axial direction of the tubular body A cutter, a torque shaft that is inserted into the inner space of the tubular body, is connected to the cutter so as to be able to transmit rotational torque to the cutter, a light guide material provided along the torque shaft, and the A reflector that reflects light emitted from the light guide material in a second direction that intersects the first direction in which the light guide material is extended; and a light beam disposed on the opposite side of the opening with respect to the axis of the tube. And a balloon inflating outward from the side wall of the tubular body.

  The catheter is inserted into the blood vessel from the distal end side. When the balloon is inflated in a state where the opening of the tube body is aligned with the emboli of the blood vessel, the tube body is fixed to the blood vessel, and the embolus enters the internal space of the tube body from the opening. The embolus that has entered the internal space of the tubular body is excised by the cutter moved in the axial direction of the tubular body. The light emitted from the light guide material provided along the torque shaft is reflected by the reflecting material and irradiated to the blood vessel. The reflected light from the blood vessel is processed as an interference signal by the OCT system through the reflective material and the light guide material, thereby obtaining an image of the blood vessel near the embolus.

  (2) Preferably, the light guide material and the reflective material are disposed in an internal space of the torque shaft, and the reflective material is directed to the second direction through an opening formed in a side wall of the torque shaft. The reflected light is emitted to the outside of the torque shaft.

  Thereby, light can be guided and reflected in the torque shaft.

  (3) Preferably, the light guide material and the reflection material are rotatable integrally with the torque shaft.

  Thus, embolectomy and OCT can be realized by controlling the rotation speed of a rotating device such as a motor connected to the torque shaft.

  (4) Preferably, the light guide material and the reflective material are movable along the first direction integrally with the torque shaft.

  Thereby, the image of the blood vessel can be acquired along the first direction.

  (5) Preferably, the light guide material and the reflective material are disposed in an internal space of the torque shaft.

  Thereby, since the light guide material and the reflective material are covered and protected by the torque shaft, the light guide material and the reflective material are hardly damaged.

  (6) Preferably, the light guide material and the reflective material are arranged on the outer peripheral surface side of the torque shaft.

  Thereby, even if a guide wire is inserted into the internal space of the torque shaft, the light reflected from the reflecting material by the guide wire is not blocked.

  (7) Preferably, a guide wire lumen is provided along the tubular body.

  Thereby, the catheter can be inserted into the blood vessel along the guide wire.

  According to the catheter of the present invention, a blood vessel embolus can be excised with a simple structure, and a blood vessel image by OCT can be acquired.

FIG. 1 is a diagram showing an external configuration of the catheter 10 in a state where the balloon 23 is deflated. FIG. 2 is an enlarged cross-sectional view showing an internal configuration in the vicinity of the distal end portion 13 of the catheter 10. FIG. 3 is a schematic diagram showing a state where the balloon 23 is expanded in the blood vessel 50. FIG. 4 is a schematic diagram showing a state in which the embolus 51 has been excised in the blood vessel 50. FIG. 5 is an enlarged cross-sectional view showing a modified example of the catheter 10.

  Hereinafter, preferred embodiments of the present invention will be described. In addition, this embodiment is only one embodiment of this invention, and it cannot be overemphasized that an embodiment can be changed in the range which does not change the summary of this invention.

  As shown in FIGS. 1 and 2, the catheter 10 includes a shaft 11 (corresponding to a tube), a torque shaft 16 and a cutter 12 provided in the shaft 11, and a distal end portion constituting the distal end of the shaft 11. 13, a base end portion 14 connected to the base end of the shaft 11, a drive portion 15 for applying rotational driving to the cutter 12, and an OCT image wire 17 (corresponding to a light guide material) provided in the torque shaft 16. )) And the reflector 18 and a guide wire tube 19. The catheter 10 is used as a medical instrument that is inserted into a blood vessel to excise an embolus or to capture a cross-sectional image of the blood vessel.

  The shaft 11 is a tube that can contain the cutter 12 therein. The shaft 11 is made of, for example, a circular tube made of medical stainless steel or a synthetic resin, and has the flexibility to bend elastically according to the curved shape of the blood vessel. The front end and the base end of the shaft 11 are open. The outer diameter of the shaft 11 is set according to the inner diameter of a blood vessel to be inserted, for example, a coronary artery. The inner diameter of the shaft 11 is set according to the outer diameter of the cutter 12. The outer diameter and inner diameter of the shaft 11 are substantially uniform over the axial direction 101 of the shaft 11. The length of the shaft 11 in the axial direction 101 is set in consideration of the length from a catheter insertion part such as a human limb to the affected part.

  As shown in FIG. 2, the shaft 11 has an opening 20 in the vicinity of the tip portion 13. The opening 20 is formed by cutting out a part of the side wall of the shaft 11. The shape and size of the opening 20 are set in consideration of the shape and size of the embolus that will be formed in the affected area.

  As shown in FIG. 2, a cutter 12 is provided near the opening 20 in the internal space of the shaft 11. The cutter 12 has a substantially cylindrical shape, and its outer diameter is slightly smaller than the inner diameter of the shaft 11. Therefore, the cutter 12 can move along the axial direction 101 in the internal space of the shaft 11. A plurality of blades are formed on the distal end side of the cutter 12 so as to extend radially from the center. Although not shown in the figure, a through hole is formed in the center of the cutter 12 along the axial direction 101.

  The torque shaft 16 is inserted into the internal space of the shaft 11, the distal end side is connected to the cutter 12, and the proximal end side extends to the outside of the proximal end portion 14 of the shaft 11. The torque shaft 16 has the flexibility to bend elastically according to the curved shape of the blood vessel together with the shaft 11, and has torsional rigidity that transmits the rotation around the axial direction 101. For example, the torque shaft 16 is configured to have a tubular shape as a whole by continuous medical stainless steel in a spiral shape.

  As shown in FIG. 1, the torque shaft 16 is connected to the drive unit 15. When the drive shaft 15 is driven to transmit the torque shaft 16 to rotate, the cutter 12 rotates. Further, when the torque shaft 16 is moved in the axial direction 101, the cutter 12 moves in the axial direction 101 in the internal space of the shaft 11.

  As shown in FIG. 2, an opening 21 is formed in the vicinity of the tip of the torque shaft 16 connected to the cutter 12. The opening 21 is formed by cutting out a part of the side wall of the torque shaft 16. The shape and size of the opening 21 are set in consideration of the shape and size of near-infrared light that is reflected by the reflector 18 and emitted in a direction orthogonal to the axial direction 101.

  As shown in FIG. 2, the OCT image wire 17 is inserted from the proximal end portion 14 into the internal space of the torque shaft 16 and extended to the opening 21. The inner diameter of the inner space of the torque shaft 16 is equivalent to the outer diameter of the OCT image wire 17. Therefore, the axis line of the OCT image wire 17 and the axis line of the torque shaft 16 are substantially matched. Although not shown in detail in each drawing, the OCT image wire 17 has a transparent outer tube with an optical fiber built in, and a lens for irradiating near infrared rays is provided at the tip. Near infrared rays emitted from the lens are emitted along the axial direction of the OCT image wire 17. The OCT image wire 17 propagates near infrared rays supplied from a light source built in the OCT main body display unit 22 to the distal end side.

  The reflecting material 18 is disposed in the internal space of the torque shaft 16 so as to face the tip of the OCT image wire 17 in the axial direction 101. The reflective surface 25 facing the tip of the OCT image wire 17 in the reflective material 18 is a flat surface inclined at an angle of 45 degrees with respect to the axis of the OCT image wire 17. The reflection surface 25 is exposed to the outside of the torque shaft 16 through the opening 21 of the torque shaft 16. The reflective material 18 is a cylindrical body made of an optical fiber, a resin, or the like, and the outer diameter thereof is equal to the inner diameter of the internal space of the torque shaft 16. Therefore, the axis of the reflector 18 and the axis of the torque shaft 16 are substantially matched. A metal layer is laminated on the surface of the reflective material 18 including the reflective surface 25. The metal layer is formed, for example, by plating or sputtering on the surface of the reflective material 18 with nickel, gold, aluminum, chromium, or the like alone or mixed. Near-infrared rays emitted from the OCT image wire 17 along the axial direction 101 are reflected by the reflecting surface 25 in a direction (second direction) orthogonal to the axial direction 101, and are emitted to the outside of the torque shaft 16 through the opening 21. . In addition, the angle with respect to the axis line of the OCT image wire 17 of the reflective surface 25 is an example, and does not necessarily need to be 45 degrees. That is, the near infrared ray emitted from the OCT image wire 17 along the axial direction 101 may be reflected in a direction intersecting the axial direction 101.

  The OCT image wire 17 and the reflector 18 can rotate around the axis (axial direction 101) integrally with the torque shaft 16 while maintaining the mutual positional relationship, that is, the separation distance and the angle of the reflecting surface 25, and It can slide in the axial direction 101. The rotation and sliding of the OCT image wire 17 and the reflector 18 are controlled by directly or indirectly operating the proximal end side of the torque shaft 16 extending from the proximal end portion 14. Specifically, the torque shaft 16 is rotated and slid by applying a driving force from the driving unit 15 to the proximal end side of the torque shaft 16.

  As shown in FIGS. 1 and 2, a balloon 23 is provided at a position opposite to the opening 20 with respect to the axis of the shaft 11. The balloon 23 can expand outward from the side wall of the shaft 11 and is folded and is in close contact with the side wall of the shaft 11 until the catheter 10 is inserted into the blood vessel. The material of the balloon 23 is preferably a biocompatible material. Specific examples include polyurethane, polyethylene, polyester, polypropylene, polyamide, polyamide elastomer, polytetrafluoroethylene, and polyvinylidene fluoride.

  As shown in FIG. 2, the proximal end side of the balloon 23 is connected to a balloon tube 24 provided along the side wall of the shaft 11. The internal space of the balloon tube 24 communicates with the internal space of the balloon 23. The balloon tube 24 extends to the proximal end portion 14, and the internal space of the balloon tube 24 is connected to the port 41 of the proximal end portion 14. When a liquid such as physiological saline injected from the port 41 of the proximal end portion 14 flows into the balloon 23, the balloon 23 is inflated in the blood vessel. The balloon tube 24 is a molded body of soft plastic that can be elastically deformed, such as polyamide, polyamide elastomer, and polyetheramide.

  As shown in FIGS. 1 and 2, a tip portion 13 is connected to the tip of the shaft 11. As shown in FIG. 2, the distal end portion 13 includes a blade tube 31, a reduced diameter portion 32, and a distal end tip 33.

  As shown in FIGS. 1 and 2, the blade tube 31 is a circular tube that is open on both sides. The blade tube 31 is connected to the tip of the shaft 11, and its internal space communicates with the internal space of the shaft 11. The blade tube 31 is made of a core material 34 reinforced by elastically deformable soft plastic such as polyamide, polyamide elastomer, or polyetheramide. The core material 34 is embedded in the side wall of the blade tube 31. The core member 34 is formed by forming a wire shape such as medical stainless steel into a mesh and forming a cylindrical shape. The inner diameter of the blade tube 31 is about the same as the outer diameter of the shaft 11, and the blade tube 31 is fitted into the tip of the shaft 11 from the outside. The outer diameter and inner diameter of the blade tube 31 are substantially uniform over the axial direction 101. In each drawing other than FIG. 1, the core material 34 is not shown.

  As shown in FIGS. 1 and 2, the reduced diameter portion 32 is a circular tube that is open on the blade tube 31 side and has a tapered outer diameter toward the tip. The reduced diameter portion 32 is connected to the tip of the blade tube 31, and its internal space is communicated with the internal space of the blade tube 31. The reduced diameter portion 32 is made of an elastically deformable soft plastic such as polyamide or polyetheramide. The inner diameter on the proximal end side of the reduced diameter portion 32 is approximately the same as the outer diameter at the distal end of the blade tube 31, and the reduced diameter portion 32 is fitted into the distal end of the blade tube 31 from the outside and thermally welded. The distal end side of the reduced diameter portion 32 is sealed. On the distal end side of the reduced diameter portion 32, the wall thickness decreases toward the distal end side.

  As shown in FIGS. 1 and 2, the tip tip 33 is connected to the tip of the reduced diameter portion 32. The tip 35 of the tip tip 33 protrudes from the tip of the reduced diameter portion 32 to the outside in the axial direction 101. The tip tip 33 is made of a soft plastic that can be elastically deformed, such as polyamide or polyetheramide. The distal tip 33 is thermally welded on the distal end side of the reduced diameter portion 32. A marker that can be confirmed by X-rays or the like may be provided at the tip of the tip chip 33.

  As shown in FIG. 1, a guide wire tube 19 is provided along the outer peripheral surface of the distal tip 33, the blade tube 31, and a part of the distal end side of the shaft 11. The guide wire tube 19 is an elastically deformable soft plastic molded body such as polyamide, polyamide elastomer, or polyether amide. The guide wire tube 19 is disposed at a position that does not overlap with the opening 20 of the shaft 11 and the balloon 23, for example, near the boundary between the shaft 11 and the balloon 23. The internal space of the guide wire tube 19 is a guide wire lumen, and a guide wire (not shown) is inserted therethrough.

  A proximal end portion 14 is provided at the proximal end of the shaft 11. The base end portion 14 is a cylindrical member having an internal space that is continuous with the internal space of the shaft 11. The base end portion 14 is a molded body of a resin such as polypropylene or ABS. The proximal end portion 14 can be a handle in operations such as when the shaft 11 is inserted into and removed from the blood vessel.

  The base end portion 14 is provided with a port 41 extending in a direction intersecting the axial direction 101. Another device such as a syringe is connected to the port 41, and a fluid such as physiological saline flowing in and out from the other device flows into and out of the balloon tube 24 from the base end portion 14. Note that the base end portion 14 may be provided with another port continuous with the internal space of the shaft 11. Such a port is used, for example, for the purpose of recovering an excised embolus that has entered the shaft 11.

  A torque shaft 16 extends from an opening on the base end side of the base end portion 14, and a drive unit 15 is connected to the torque shaft 16. The drive unit 15 includes a motor and a battery. The rotation of the motor of the drive unit 15 is transmitted to the torque shaft 16.

  The OCT image wire 17 disposed in the internal space of the torque shaft 16 is connected to the OCT main body display unit 22 via the drive unit 15. The OCT main body display unit 22 includes a light source that supplies near-infrared rays, an interferometer, a movable reference mirror, a monitor, a calculation device, and the like. The near infrared rays supplied from the light source are divided by the interferometer and supplied to the OCT image wire 17 and the movable reference mirror, respectively, and the near infrared rays reflected by the blood vessel and the near infrared rays reflected by the movable reference mirror are interferometers. Join in. These near-infrared interference signals are processed by the arithmetic unit and displayed as a tomographic image of the blood vessel on the monitor.

[How to use the catheter 10]
Hereinafter, the method of using the catheter 10 will be described with reference to FIGS.

  The catheter 10 is used when excising the embolus 51 formed on the inner wall of the blood vessel 50. The position of the embolus 51 is confirmed by a vascular tomographic image by OCT. The catheter 10 is inserted from the distal end portion 13 into the blood vessel 50 in a state where the balloon 23 is deflated (see FIG. 1). Although not shown in each figure, when the catheter 10 is inserted into the blood vessel 50, a guide wire is inserted into the blood vessel 50 in advance. The guide wire is inserted into the blood vessel 50 by a known method. The catheter 10 is inserted into the blood vessel 50 from the distal end portion 13 while the guide wire inserted into the blood vessel 50 is inserted into the guide wire tube 19.

  At a location where the blood vessel 50 is curved like a coronary artery, the distal end portion 13 is advanced to the embolus 51 of the blood vessel 50 while being elastically curved along the guide wire. When the distal end portion 13 reaches the embolus 51 and the opening 20 of the shaft 11 faces the embolus 51, the insertion of the shaft 11 into the blood vessel 50 is finished. The torque shaft 16 is rotated by the drive unit 15 and near infrared rays are supplied from the OCT main body display unit 22 to the OCT image wire 17, whereby a tomographic image of the blood vessel 50 is displayed on the OCT main body display unit 22. By confirming the tomographic image of the blood vessel 50, it is possible to confirm that the opening 20 has reached the position corresponding to the embolus 51 and the state of the embolus 51. Thereafter, the guide wire is pulled out from the proximal end portion 14 side of the catheter 10. A drive unit 15 is connected to the torque shaft 16 of the cutter 12. 3 and 4, the guide wire is omitted.

  As shown in FIG. 3, in a state where the opening 20 of the shaft 11 faces the embolus 51, the deflated balloon 23 is expanded by the fluid that flows into the balloon tube 24 from the port 41. The expanded balloon 23 abuts against the inner wall of the blood vessel 50 opposite to the embolus 51, so that the opening 20 is in close contact with the embolus 51, and a part of the embolus 51 enters the internal space of the shaft 11 from the opening 20. Thus, the catheter 10 is fixed with respect to the blood vessel 50.

  Subsequently, the rotation of the drive unit 15 is transmitted to the cutter 12 through the torque shaft 16 and the cutter 12 is rotated. On the proximal end portion 14 side, the torque shaft 16 is advanced toward the distal end side in the axial direction 101 with respect to the shaft 11, so that the rotating cutter 12 contacts the embolus 51, and the embolus 51 is cut off by the cutter 12. The excised piece 52 of the embolus 51 enters the internal space of the blade tube 31 through the internal space of the shaft 11.

  After the embolus 51 is excised with the cutter 12, a tomographic image of the blood vessel 50 with the embolus 51 excised can be obtained by OCT similar to that described above. Thereby, since the state where the embolus 51 is excised can be confirmed immediately, that is, without pulling out the catheter 10 with respect to the blood vessel 50, for example, if excision of the embolus 51 is insufficient, the cutter 12 is rotated to remain. The embolus 51 that has been removed can be excised. The tomographic image of the blood vessel 50 may be collected while moving the reflector 18 together with the torque shaft 16 in the axial direction 101 with respect to the shaft 11. Thereby, a tomographic image continuous in the length direction of the blood vessel 50 (almost coincident with the axial direction 101) is obtained. When the excision of the embolus 51 is completed, the balloon 23 is deflated, and the catheter 10 is pulled out from the blood vessel 50 and retracted.

[Operational effects of this embodiment]
According to the catheter 10 according to the present embodiment, the embolus 51 of the blood vessel 50 can be excised with a simple structure, and an OCT image of the blood vessel 50 can be acquired.

  Further, since the OCT image wire 17 and the reflecting material 18 are disposed in the internal space of the torque shaft 16, near infrared light can be guided and reflected near the embolus 51 of the blood vessel 50 in the torque shaft 16.

  Further, since the OCT image wire 17 and the reflector 18 can rotate together with the torque shaft 16, excision of the embolus 51 and OCT can be realized by controlling the number of rotations of the motor in the drive unit 15.

  In addition, since the OCT image wire 17 and the reflector 18 can move along the axial direction 101 together with the torque shaft 16, a tomographic image of the blood vessel 50 along the axial direction 101 can be acquired.

  Further, since the OCT image wire 17 and the reflective material 18 are disposed in the internal space of the torque shaft 16, the OCT image wire 17 and the reflective material 18 are covered and protected by the torque shaft 16.

  Moreover, since the guide wire tube 19 is provided along the shaft 11, the catheter 10 can be inserted into the blood vessel 50 along the guide wire.

[Modification]
In the above-described embodiment, the guide wire tube 19 has a so-called rapid exchange type structure arranged outside the shaft 11. However, as shown in FIG. 5, the inner space of the torque shaft 16 is a guide wire lumen. A so-called over-the-wire type structure may be employed.

  When the over-the-wire type structure is adopted, the OCT image wire 17 and the reflector 18 are arranged so as to face each other in the axial direction 101 along the outer peripheral surface of the torque shaft 16 as shown in FIG. Is done. Near-infrared rays emitted from the OCT image wire 17 along the axial direction 101 are reflected by the reflecting material 18 toward the outside of the torque shaft 16 in a direction intersecting (perpendicular to) the axial direction 101. Thereby, near infrared rays are not irradiated to the guide wire inserted in the internal space of the torque shaft 16. Further, in the over-the-wire type structure, it is not necessary to form the opening 21 in the torque shaft 16.

  Further, when an over-the-wire type structure is adopted, as shown in FIG. 5, the distal tip 33 has a circular tube with both sides open and the proximal end 36 side tapered to expand the outer diameter. Is adopted. The distal tip 33 is connected to the distal end of the reduced diameter portion 32, and the internal space thereof is communicated with the internal space of the reduced diameter portion 32. The tip 35 of the tip tip 33 protrudes from the tip of the reduced diameter portion 32 to the outside in the axial direction 101. On the proximal end 36 side of the distal tip 33, the inner space of the reduced diameter portion 32 extends in the axial direction 101, and the proximal end 36 reaches the inner space of the blade tube 31. In other words, the diameter-reduced portion 32 from the tip side portion of the blade tube 31 has a double tube structure in which the blade tube 31 and the reduced-diameter portion 32 are outside and the tip tip 33 is inside.

  The distal tip 33 has an enlarged diameter on the base end 36 side, but the outer diameter and inner diameter of the other portions are substantially equal. The outer diameter of the uniform portion is smaller than the inner diameter of the blade tube 31 and is about the same as the inner diameter of the tip of the reduced diameter portion 32. Further, the diameter of the base end 36 is increased, but the maximum diameter is smaller than the inner diameter of the blade tube 31.

  Further, the cutter 12 is formed with a through hole along the axial direction 101. A guide wire lumen is formed along the axial direction 101 of the shaft 11 by the internal space of the torque shaft 16, the through hole of the cutter 12, the internal space of the blade tube 31, and the internal space of the tip tip 33.

  The tip surface of the OCT image wire 17 may be a flat surface that is inclined at an angle of 45 degrees with respect to the axial direction 101, and the reflecting material 18 may be provided on the tip surface. In that case, there is no reflector 18 arranged at a distance away from the OCT image wire 17.

10 Catheter 11 Shaft (Tube)
12 Cutter 16 Torque shaft 17 OCT image wire (light guide material)
18 Reflector 19 Guide wire tube (Guide wire lumen)
20, 21 Opening 23 Balloon

Claims (7)

A tube having an opening in a part of the side wall on the tip side;
A cutter that is located near the opening in the internal space of the tubular body and is movable in the axial direction of the tubular body;
A torque shaft that is inserted into the internal space of the tubular body and is connected to the cutter so as to be able to transmit rotational torque to the cutter;
A light guide provided along the torque shaft;
A reflective material that reflects light emitted from the light guide material in a second direction intersecting the first direction in which the light guide material is extended;
A catheter that is disposed on the opposite side of the opening with respect to the axis of the tube and that swells outward from the side wall of the tube. The light guide material and the reflective material are disposed in an internal space of the torque shaft,
The catheter according to claim 1, wherein the reflecting material emits light reflected in the second direction to the outside of the torque shaft through an opening formed in a side wall of the torque shaft.   The catheter according to claim 1, wherein the light guide material and the reflective material are rotatable integrally with the torque shaft.   The catheter according to any one of claims 1 to 3, wherein the light guide member and the reflection member are movable along the first direction integrally with the torque shaft.   The catheter according to any one of claims 1 to 4, wherein the light guide material and the reflective material are disposed in an internal space of the torque shaft.   The catheter according to any one of claims 1 to 4, wherein the light guide material and the reflective material are disposed on an outer peripheral surface side of the torque shaft.   The catheter according to any one of claims 1 to 4, wherein a guide wire lumen is provided along the tubular body.

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