Balloon catheter

Abstract

This balloon catheter is provided with a long member and an expansion member which is supported on the outer surface of the long member and which is expandable to the outside in the radial direction of the long member, and which is provided from the inside in the radial direction toward the outside: a laser irradiation unit which is capable of emitting laser light toward the outside in the radial direction; a penetration unit that enables the laser beam emitted from the laser beam irradiation unit to penetrate in the radial direction; and a light absorption part capable of absorbing the laser light that has passed through the transmission part, the laser light irradiation part, the transmission part, and the light absorption part being provided only on the elongated member, only on the expansion member, or separately on both the elongated member and the expansion member.

Description

Technical Field

[0001] The present invention relates to a balloon catheter. Background Art

[0002] Conventionally, probes that convert laser light into shock waves and utilize the stress of these shock waves to perform various treatments are known. Patent Document 1 discloses such a probe. Furthermore, probes that convert the vaporization expansion force of liquid generated by spark discharge in a liquid atmosphere into mechanical force to perform treatments are also known. Patent Document 2 discloses such a probe.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 5-300911

[0006] Patent Document 2: Japanese Patent Application No. 2015-522344 Summary of the Invention

[0007] Problems to be solved by the invention

[0008] However, the probes described in Patent Documents 1 and 2 still have room for improvement in terms of efficiency in ensuring that the force required for treatment acts on the target site, for example, when performing treatment on the target site such as fragmentation of a calcified region within a blood vessel.

[0009] An object of the present disclosure is to provide a balloon catheter capable of improving the efficiency of treating a target site.

[0010] Means for solving problems

[0011] As the balloon catheter of the first embodiment of the present disclosure,

[0012] (1) Balloon catheter includes:

[0013] elongated components; and

[0014] an expansion member supported on the outer surface of the elongated member and capable of expanding radially outward of the elongated member;

[0015] From the radial inside to the outside, there are:

[0016] a laser irradiation portion capable of emitting laser light toward the outside in the radial direction;

[0017] a penetrating portion that allows the laser light emitted from the laser irradiation portion to penetrate in the radial direction; and

[0018] a light absorbing portion capable of absorbing the laser light that has passed through the penetrating portion,

[0019] The laser irradiation portion, the penetrating portion, and the light absorbing portion are provided only on the elongated member, only on the expansion member, or separately on both the elongated member and the expansion member.

[0020] As a balloon catheter of one embodiment of the present disclosure,

[0021] (2) In the balloon catheter described in (1) above,

[0022] The long member includes the laser irradiation portion,

[0023] The expansion member includes the penetration portion and the light absorbing portion.

[0024] As a balloon catheter of one embodiment of the present disclosure,

[0025] (3) In the balloon catheter described in (2) above,

[0026] The long strip component includes:

[0027] a body member supporting the expansion member on an outer surface; and

[0028] a sleeve member mounted on the main body member so as to be rotatable relative to the main body member in the circumferential direction;

[0029] The sleeve member includes the laser irradiation portion.

[0030] As a balloon catheter of one embodiment of the present disclosure,

[0031] (4) In the balloon catheter described in (3) above,

[0032] The sleeve member is mounted on the main body member so as to be relatively movable with respect to the main body member in the longitudinal direction of the elongated member.

[0033] As a balloon catheter of one embodiment of the present disclosure,

[0034] (5) In the balloon catheter described in (2) above,

[0035] The long strip component includes:

[0036] a body member supporting the expansion member on an outer surface; and

[0037] a sleeve component mounted on the main body component,

[0038] The sleeve member includes the laser irradiation portion,

[0039] The laser irradiation unit is of a full-circle irradiation type that emits radial laser light.

[0040] As a balloon catheter of one embodiment of the present disclosure,

[0041] (6) In the balloon catheter described in (5) above,

[0042] A portion of the sleeve member and / or the main body member, which is interposed between the laser irradiation portion and the expansion member, is configured to allow the laser light emitted from the laser irradiation portion to pass therethrough.

[0043] As a balloon catheter of one embodiment of the present disclosure,

[0044] (7) In the balloon catheter described in (1) above,

[0045] A transmission member is provided that is connected to the laser irradiation unit and transmits light. The transmission member has a structure capable of transmitting laser beams of different outputs.

[0046] As a balloon catheter of one embodiment of the present disclosure,

[0047] (8) In the balloon catheter described in (7) above,

[0048] The transmission member is a double-clad optical fiber capable of propagating treatment laser light and diagnosis laser light.

[0049] As a balloon catheter of one embodiment of the present disclosure,

[0050] (9) In the balloon catheter according to any one of (2) to (4) above,

[0051] The expansion component comprises:

[0052] a penetrating layer as the penetrating portion, which enables the laser to penetrate in the radial direction; and

[0053] The light absorbing layer serving as the light absorbing portion is located outside the transmission layer in the radial direction and absorbs the laser light transmitted through the transmission layer.

[0054] As a balloon catheter of one embodiment of the present disclosure,

[0055] (10) In the balloon catheter described in (1) above,

[0056] The long member includes the laser irradiation portion, the penetrating portion, and the light absorbing portion.

[0057] As a balloon catheter of one embodiment of the present disclosure,

[0058] (11) In the balloon catheter described in (10) above,

[0059] The long strip component includes:

[0060] a body member supporting the expansion member on an outer surface; and

[0061] a sleeve member mounted on the main body member so as to be rotatable relative to the main body member in the circumferential direction;

[0062] The sleeve component includes the laser irradiation portion, the penetrating portion, and the light absorbing portion.

[0063] As a balloon catheter of one embodiment of the present disclosure,

[0064] (12) In the balloon catheter described in (11) above,

[0065] The sleeve member is mounted on the main body member so as to be relatively movable with respect to the main body member in the longitudinal direction of the elongated member.

[0066] As a balloon catheter of one embodiment of the present disclosure,

[0067] (13) In the balloon catheter described in (1) above,

[0068] The expansion member includes the laser irradiation portion, the penetrating portion, and the light absorbing portion.

[0069] As a balloon catheter of one embodiment of the present disclosure,

[0070] (14) In the balloon catheter described in (13) above,

[0071] The expansion component comprises:

[0072] an expansion main body formed by stacking a plurality of layers; and

[0073] a laser irradiation body mounted on the expansion main body;

[0074] The laser irradiation body includes the laser irradiation portion,

[0075] The expansion main body comprises:

[0076] a penetrating layer as the penetrating portion, which enables the laser to penetrate in the radial direction; and

[0077] The light absorbing layer serving as the light absorbing portion is located outside the transmission layer in the radial direction and absorbs the laser light transmitted through the transmission layer.

[0078] As a balloon catheter of one embodiment of the present disclosure,

[0079] (15) In the balloon catheter according to any one of (1) to (14) above,

[0080] The penetrating portion and the light absorbing portion extend over the entire circumference of the long member.

[0081] As a balloon catheter of one embodiment of the present disclosure,

[0082] (16) In the balloon catheter according to any one of (1) to (15) above,

[0083] A plurality of the laser irradiation units are arranged at intervals in the circumferential direction of the long member.

[0084] Effects of the Invention

[0085] According to the present disclosure, it is possible to provide a balloon catheter capable of improving the efficiency of treating a target site. BRIEF DESCRIPTION OF THE DRAWINGS

[0086] Figure 1 It is a diagram showing a balloon catheter according to the first embodiment of the present disclosure.

[0087] Figure 2 yes Figure 1 A cross-sectional view of the balloon catheter shown on a plane parallel to the central axis.

[0088] Figure 3 yes Figure 1 Cross-sectional view of the balloon catheter with the position of line II.

[0089] Figure 4 It shows Figure 1 FIG. 1 is a diagram showing a balloon catheter in a state where the expansion component is expanded.

[0090] Figure 5 yes Figure 4 The balloon catheter shown is Figure 2 Cross-sectional view at the same location.

[0091] Figure 6 yes Figure 4 The balloon catheter shown is Figure 3 Cross-sectional view at the same location.

[0092] Figure 7 This is an explanatory diagram for explaining the principle of generation of laser-induced shock waves.

[0093] Figure 8A It is a cross-sectional view of a balloon catheter according to a second embodiment of the present disclosure, taken on a plane parallel to the central axis.

[0094] Figure 8B yes Figure 8A A cross-sectional view of the balloon catheter shown on a plane perpendicular to the central axis.

[0095] Figure 9This is a cross-sectional view of a balloon catheter according to a third embodiment of the present disclosure, taken on a plane perpendicular to the central axis.

[0096] Figure 10 It is a cross-sectional view of a balloon catheter according to a fourth embodiment of the present disclosure, taken on a plane parallel to the central axis.

[0097] Figure 11A yes Figure 10 A cross-sectional view of the balloon catheter shown on a plane perpendicular to the central axis.

[0098] Figure 11B yes Figure 10 The cross-sectional view of the balloon catheter shown on the plane perpendicular to the central axis is a diagram showing the sleeve component from Figure 11A The state of the main body component is relatively rotated relative to the state of the main body component.

[0099] Figure 12 It is a cross-sectional view of a balloon catheter according to a fifth embodiment of the present disclosure, taken on a plane perpendicular to the central axis.

[0100] Figure 13 It shows Figure 10 A diagram showing a modified example of the balloon catheter according to the fourth embodiment.

[0101] Figure 14 It shows Figure 10 FIG. 2 is a diagram showing another modified example of the balloon catheter according to the fourth embodiment.

[0102] Figure 15 It shows Figure 10 FIG. 2 is a diagram showing another modified example of the balloon catheter according to the fourth embodiment.

[0103] Figure 16 yes Figure 15 A cross-sectional view of the transmission component is shown.

[0104] Figure 17 Is shown using Figure 15 The figure shows an example of a surgery performed with a balloon catheter, which shows the treatment of the target site using a treatment laser. Figure 15 The state shown in the figure is completed.

[0105] Figure 18 Is shown using Figure 15 The figure shows an example of an operation performed by a balloon catheter, which shows the sleeve part being moved from Figure 17 The position shown returns Figure 15 A diagram showing the status of the location.

[0106] Figure 19 Is shown using Figure 15The figure shows an example of a surgery performed with a balloon catheter, which is a diagram showing the operation of obtaining a diagnostic image of the target site after treatment. Figure 18 The state shown in the figure shows the state in which the transmission and reception of the diagnostic laser light is completed. DETAILED DESCRIPTION

[0107] Hereinafter, embodiments of the balloon catheter disclosed herein will be described with reference to the accompanying drawings. The same reference numerals are used to denote the same components in the drawings.

[0108] [First embodiment]

[0109] Figure 1 1 is a diagram showing a balloon catheter 1 as one embodiment of the balloon catheter disclosed herein. Figure 1 The figure shows a state where a balloon catheter 1 is inserted into a blood vessel BV. The balloon catheter 1 is a medical device that is inserted into the blood vessel BV and can disrupt the calcified region X within the blood vessel BV using shock waves generated by laser irradiation. In this embodiment, the calcified region X within the blood vessel BV is used as an example of a target site to be treated by the balloon catheter 1. However, the balloon catheter 1 can also be used to treat other target sites.

[0110] like Figure 1 As shown in FIG. 1 , the balloon catheter 1 of this embodiment includes a long member 2, an expansion member 3 and a hub 4. Figure 1 , the balloon catheter 1 is percutaneously inserted into the patient's blood vessel BV and the expansion member 3 is introduced to the position of the lesion portion of the target site where the calcified area X is formed. Figure 1 The expansion member 3 in the contracted state is shown in FIG. The expansion member 3 is guided to the lesion in the blood vessel BV in the contracted state.

[0111] Hereinafter, the longitudinal direction of the elongated member 2 parallel to the central axis O of the elongated member 2 in the balloon catheter 1 will be referred to as the "longitudinal direction A." Furthermore, the circumferential direction of the elongated member 2 surrounding the central axis O of the elongated member 2 in the balloon catheter 1 will be referred to as the "circumferential direction B." Furthermore, the radial direction of the elongated member 2, i.e., the radial direction of the imaginary circle centered on the central axis O of the elongated member 2 on any cross-section perpendicular to the central axis O of the elongated member 2 in the balloon catheter 1, will be referred to as the "radial direction C."

[0112] Figure 2 、 Figure 3 yes Figure 1 A cross-sectional view of the balloon catheter 1 is shown. Figure 2 : is a cross-sectional view of the balloon catheter 1 on a plane including the central axis O and parallel to the central axis O. Figure 2 In FIG, only the distal end portion of the balloon catheter 1 (hereinafter referred to as “distal end portion”) is shown. Figure 3 yes Figure 1Cross-sectional view of balloon catheter 1 showing the location of line II.

[0113] Figures 4 to 6 Show Figures 1 to 3 The expansion member 3 in the contracted state shown is in the expanded state. Specifically, Figure 4 Show Figure 1 The expansion member 3 in the contracted state shown is in the expanded state within the blood vessel BV. Figure 5 is with Figure 2 The cross-sectional view at the same position shows the expansion member 3 in the expanded state. Figure 6 is with Figure 3 The cross-sectional view at the same position shows the expansion member 3 in the expanded state.

[0114] like Figures 1 to 6 As shown, the expansion member 3 can be supported on the outer surface of the elongated member 2 and can expand outward in the radial direction C of the elongated member 2 .

[0115] As described in detail later, the balloon catheter 1 is provided with a laser irradiation portion 31, a penetrating portion 32, and a light absorbing portion 33 extending from the inside of the radial direction C toward the outside. The laser irradiation portion 31 is configured to emit laser light toward the outside of the radial direction C. The penetrating portion 32 is configured to allow the laser light irradiated from the laser irradiation portion 31 to penetrate in the radial direction C. The light absorbing portion 33 is configured to absorb the laser light that has penetrated through the penetrating portion 32. The laser light emitted from the laser irradiation portion 31 penetrates the penetrating portion 32 and is absorbed by the light absorbing portion 33. In the light absorbing portion 33, the absorbed laser light generates plasma. The plasma generated by the light absorbing portion 33 is easily retained within the light absorbing portion 33 because the penetrating portion 32 covers the inside of the light absorbing portion 33 in the radial direction C. Thus, the laser-induced shock wave can be transmitted from the light absorbing portion 33 toward the outside of the radial direction C. In the balloon catheter 1, the laser-induced shock wave collides with the calcified region X within the blood vessel BV, thereby fragmenting the calcified region X.

[0116] Furthermore, the balloon catheter 1 can achieve a state in which the expansion member 3 is in contact with the calcified region X, which is the target site. Therefore, the aforementioned laser-induced shock wave can be reliably applied to the calcified region X within the blood vessel BV. Specifically, according to the balloon catheter 1, the force required for treatment of the target site is ensured by using the laser-induced shock wave, and the laser-induced shock wave is reliably applied to the target site by using the expansion member 3. This improves the efficiency of treatment of the target site.

[0117] The laser irradiation unit 31 only needs to emit laser light capable of generating a laser-induced shock wave in the light absorbing unit 33 , and for example, nanosecond pulse laser light, picosecond laser light, or femtosecond pulse laser light can be used.

[0118] The penetrating portion 32 is configured to allow the laser light irradiated from the laser irradiation portion 31 to pass through, and its configuration is not particularly limited. Examples of the penetrating portion 32 include transparent portions formed from polymer materials such as polyolefins (e.g., polyethylene, polypropylene, polybutene, ethylene-propylene copolymers, ethylene-vinyl acetate copolymers, ionomers, or mixtures of two or more thereof), polyvinyl chloride, polyamide, polyamide elastomer, polyurethane, polyurethane elastomer, polyimide, fluororesin, or mixtures thereof. The thickness of the penetrating portion 32 can be, for example, 1 to 500 μm. However, the thickness of the penetrating portion 32 is preferably 5 to 100 μm, more preferably 10 to 50 μm.

[0119] The light-absorbing portion 33 is configured to absorb the laser light emitted from the laser irradiation portion 31 and transmitted through the penetrating portion 32, and its composition is not particularly limited. The light-absorbing portion 33 can be made of, for example, natural rubber, black rubber such as EPDM, nitrile, chloroprene, or neoprene, or a flexible resin blended with a black component such as carbon black or a black perylene pigment. The thickness of the light-absorbing portion 33 can be, for example, 1 to 500 μm. However, the thickness of the light-absorbing portion 33 is preferably 5 to 100 μm, more preferably 10 to 50 μm.

[0120] The laser irradiation portion 31, the penetrating portion 32, and the light absorbing portion 33 are provided only on the elongated member 2, only on the expansion member 3, or separately on both the elongated member 2 and the expansion member 3. In the balloon catheter 1 of this embodiment, the laser irradiation portion 31, the penetrating portion 32, and the light absorbing portion 33 are separately provided on both the elongated member 2 and the expansion member 3. The configuration in which the laser irradiation portion 31, the penetrating portion 32, and the light absorbing portion 33 are provided only on the elongated member will be described later (see Figure 8A 、 Figure 8B 、 Figure 12 ). In addition, the structure in which the laser irradiation part 31, the penetrating part 32 and the light absorbing part 33 are only provided in the expansion member will be described later (see Figure 9 ).

[0121] The balloon catheter 1 according to this embodiment will be described in detail below.

[0122] <Long part 2>

[0123] like Figure 1 、 Figure 4 As shown, the elongated member 2 is percutaneously inserted into the patient's blood vessel BV from its distal end. The hub 4 is connected to the proximal end of the elongated member 2. Hereinafter, the direction from the proximal end toward the distal end of the elongated member 2 in the longitudinal direction A will be referred to as "distal direction A1" or "distal side." Furthermore, the direction from the distal end toward the proximal end of the elongated member 2 in the longitudinal direction A, i.e., the direction opposite to the distal direction A1, will be referred to as "proximal direction A2" or "proximal side."

[0124] The long member 2 of this embodiment includes a long main body member 10 and a laser irradiation body 20 mounted on the main body member 10. Figure 2 、 Figure 3 、 Figure 5 、 Figure 6 As shown, the long member 2 of this embodiment includes a plurality of laser irradiation bodies 20 arranged at different positions in the longitudinal direction A and the circumferential direction B of the main body member 10 .

[0125] The main body part 10 supports the expansion part 3. More specifically, the main body part 10 supports the expansion part 3 at its distal end. The main body part 10 internally divides a flow path 10a that can supply fluid to the receiving space 5 divided by the expansion part 3. The fluid supplied to the receiving space 5 of the expansion part 3 can be taken out through the flow path 10a by suction or the like. The flow path 10a extends from the end portion on the proximal end side connected to the hub part 4 of the main body part 10 (hereinafter referred to as the "proximal end portion") to the position where the expansion part 3 is provided in the length direction A. The proximal end of the flow path 10a is connected to the flow path inside the hub part of the hub part 4. As Figure 2 、 Figure 5 As shown, the distal end of the flow path 10 a is communicated with the accommodating space 5 .

[0126] In addition, if Figure 2 、 Figure 3 、 Figure 5 、 Figure 6 As shown, the main body 10 has a guidewire insertion hole 10b defined therein for inserting a guidewire. The main body 10 is guided within the blood vessel BV along the guidewire inserted through the guidewire insertion hole 10b. The guidewire insertion hole 10b extends from the proximal end of the main body 10 to a distal opening defined at the distal end of the main body 10.

[0127] like Figure 2 、 Figure 5As shown, the main body part 10 of the present embodiment includes an inner tube 11 which is divided into a guide wire insertion hole 10b and an outer tube 12 which covers the outer side of the radial direction C of the inner tube 11 and is arranged concentrically with the inner tube 11. The inner tube 11 is configured to protrude further in the distal direction A1 than the distal end of the outer tube 12. A marking component 13 is installed at the distal end of the inner tube 11. The marking component 13 has X-ray contrast properties. Specifically, the marking component 13 is formed of a material with high X-ray non-penetration. Specifically, the marking component 13 can be composed of a material with high X-ray non-penetration, such as platinum, gold, iridium, tungsten, etc. The flow path 10a of the present embodiment is divided between the outer surface of the inner tube 11 and the inner surface of the outer tube 12. The flow path 10a is connected to the accommodation space 5 at the distal end of the outer tube 12. However, the structure of the main body part 10 is not limited to the structure of the present embodiment. The main body member 10 of the present embodiment is realized by forming the flow path 10a and the guide wire insertion hole 10b into a double-tube structure. However, the means for realizing the flow path 10a and the guide wire insertion hole 10b is not limited to the double-tube structure.

[0128] As the forming material of the inner tube 11 and the outer tube 12 of the main body part 10, for example, polyolefins (such as polyethylene, polypropylene), polyolefin elastomers (such as polyethylene elastomers, polypropylene elastomers, elastomers using ethylene-propylene copolymers, etc.), polyvinyl chloride, ethylene-vinyl acetate copolymers, polyamide elastomers, polyurethanes, fluororesins and other thermoplastic resins, silicone rubber, etc. can be used.

[0129] In this embodiment, the long member 2 includes a laser irradiation portion 31. More specifically, in this embodiment, the laser irradiation body 20 of the long member 2 includes a laser irradiation portion 31. The laser irradiation body 20 may be, for example, a nanosecond pulse laser or a femtosecond pulse laser. Figure 2 、 Figure 3 、 Figure 5 、 Figure 6 As shown, the laser irradiation body 20 of this embodiment is attached to the main body 10. More specifically, the laser irradiation body 20 of this embodiment is attached to the outer surface of the inner tube 11 of the main body 10 at a position where the expansion member 3 is provided in the longitudinal direction A. The laser irradiation portion 31 of the laser irradiation body 20 is capable of emitting laser light from the outer surface of the inner tube 11 toward the outside in the radial direction C.

[0130] like Figure 2 、 Figure 3 、 Figure 5 、 Figure 6As shown, preferably, only the accommodation space 5 is interposed between the laser irradiation portion 31 and the expansion member 3 in the radial direction C, and no other components or parts of the balloon catheter 1 are interposed. Thus, the laser light emitted from the laser irradiation portion 31 toward the outside in the radial direction C is irradiated toward the expansion member 3 without being attenuated by other components or parts of the balloon catheter 1 interposed between the laser irradiation portion 31 and the expansion member 3.

[0131] like Figure 3 、 Figure 6 As shown, a plurality of laser irradiation bodies 20 including laser irradiation parts 31 are arranged at intervals in the circumferential direction B of the long member 2. Thus, within a wide range in the circumferential direction B, lasers can be emitted from the plurality of laser irradiation parts 31 of the plurality of laser irradiation bodies 20 toward the outside of the radial direction C. Thus, not only when the calcified area X is formed in the entire circumferential range of the inner wall of the blood vessel BV, but also when it is formed in only a part of the circumferential area of ​​the inner wall of the blood vessel BV, the laser induced shock wave can be more reliably applied to the calcified area X. The irradiation range L1 in the circumferential direction B of the light absorbing part 33 irradiated by the laser from each laser irradiation part 31 (see Figure 7 ) can be appropriately set. Therefore, by appropriately setting the number of laser irradiation sections 31 in the circumferential direction B and the irradiation range of each laser irradiation section 31 in the light absorbing section 33 in the circumferential direction B, the laser-induced shock wave can be transmitted outward in the radial direction C within a desired range in the circumferential direction B.

[0132] In addition, if Figure 2 、 Figure 5 As shown, a plurality of laser irradiation bodies 20 including laser irradiation sections 31 are arranged at intervals in the longitudinal direction A of the elongated member 2. Consequently, laser light can be emitted from the plurality of laser irradiation sections 31 of the plurality of laser irradiation bodies 20 toward the outside in the radial direction C over a wide range in the longitudinal direction A. Consequently, not only when the calcified region X is formed over a wide range in the direction in which the blood vessel BV extends, but also when it is formed only over a narrow range in the direction in which the blood vessel BV extends, the laser-induced shock wave can be more reliably applied to the calcified region X. The laser irradiation body 20 may also include a laser irradiation section 31 that is elongated in the longitudinal direction A and that can emit a wide laser light with uniform intensity in the radial direction C regardless of its position in the longitudinal direction A. In this case, a plurality of laser irradiation bodies 20 may not be arranged in the longitudinal direction A.

[0133] like Figure 2 、 Figure 5 As shown in FIG. 1 , the laser irradiation unit 20 includes a transmission component 20a including an optical fiber for transmitting light to the laser irradiation unit 31. The configuration position of the transmission component 20a is not particularly limited, but Figure 2 、 Figure 5As shown, the transmission component 20a may also be arranged along the inner surface of the inner tube 11 of the main body component 10. In addition, the transmission component 20a may also be arranged along the outer surface of the inner tube 11 or along the insertion hole formed in the peripheral wall of the inner tube 11. Figure 3 、 Figure 6 The transmission component 20a is omitted in the figure.

[0134] <Expansion Part 3>

[0135] like Figure 2 、 Figure 5 As shown, the expansion member 3 is supported on the outer surface of the elongated member 2. Specifically, the expansion member 3 of this embodiment is supported on the outer surface of the main body member 10 of the elongated member 2. More specifically, the expansion member 3 of this embodiment is supported within the outer surface of the inner tube 11 of the main body member 10 and the outer surface of the outer tube 12 of the main body member 10, so as to straddle the distal end of the outer tube 12 in the longitudinal direction A.

[0136] The expansion member 3 of this embodiment is supported on the outer surface of the elongated member 2 so as to surround the outer side of the elongated member 2 in the radial direction C. In other words, the expansion member 3 surrounds the outer side of the outer surface of the elongated member 2 in the radial direction C over the entire area in the circumferential direction B of the elongated member 2.

[0137] The expansion member 3 is configured to expand outward in the radial direction C of the elongated member 2. More specifically, the expansion member 3 of this embodiment is composed of an expandable membrane body attached to the outer surface of the main body member 10 of the elongated member 2. Both ends of the expandable membrane body in the longitudinal direction A of the expansion member 3 are annularly bonded to the outer surface of the elongated member 2 over the entire circumferential direction B of the elongated member 2 by bonding, welding, or the like. More specifically, the distal end of the expandable membrane body of the expansion member 3 is annularly bonded to the outer surface of the inner tube 11 over the entire circumferential direction B. Furthermore, the proximal end of the expandable membrane body of the expansion member 3 is annularly bonded to the outer surface of the outer tube 12 over the entire circumferential direction B. The central portion of the expandable membrane body of the expansion member 3 in the longitudinal direction A is not bonded to the outer surfaces of the inner tube 11 and the outer tube 12 over the entire circumferential direction B of the elongated member 2, and an annular accommodation space 5 is defined between the expandable membrane body and the outer surface of the elongated member 2. When fluid is supplied to the housing space 5 through the flow path 10 a of the elongated member 2 , the expandable membrane of the expandable member 3 is squeezed by the fluid and expands outward in the radial direction C of the elongated member 2 over the entire circumference B of the elongated member 2 .

[0138] like Figure 3As shown in FIG. 1 , the expandable membrane body as the expandable member 3 is wound along the outer surface of the long member 2 in a folded state in a contracted state. Furthermore, the expandable membrane body as the expandable member 3 in the contracted state is expanded by supplying fluid to the housing space 5 so as to protrude outward in the radial direction C of the long member 2, thereby unfolding the fold. As a result, as shown in FIG. Figure 6 As shown, the expandable membrane body serving as the expandable member 3 is in an expanded state.

[0139] The fluid supplied to the housing space 5 may be a gas or a liquid, and examples thereof include gases such as helium, CO 2 gas, and O 2 gas, and liquids such as physiological saline and contrast agents.

[0140] The expansion member 3 of this embodiment is comprised of an expandable membrane attached to the outer surface of the main body 10 of the elongated member 2, but is not limited to this configuration. The expansion member 3 may also be an annular bag supported on the outer surface of the main body 10 of the elongated member 2. In other words, the housing space 5 of the expansion member 3 may be a space defined solely by the bag serving as the expansion member 3. As such, the expansion member 3 can be configured as a balloon capable of expansion and contraction by fluid, and the expansion member 3 may be comprised of either an expandable membrane or a bag. However, when the expansion member 3 is comprised of a bag, a radially inner C portion of the membrane of the bag constituting the expansion member 3 is sandwiched between the laser irradiation section 31 and the radially outer C portion of the membrane of the bag constituting the expansion member 3. Therefore, the radially inner C portion of the membrane of the bag constituting the expansion member 3 must be configured to allow laser light to penetrate. This allows the laser light emitted from the laser irradiation section 31 to reach the radially outer C portion of the membrane of the bag constituting the expansion member 3. Therefore, to simplify the configuration of the expansion member 3, it is preferable that the expansion member 3 be comprised of an expandable membrane, as in this embodiment.

[0141] like Figure 6 As shown, the expandable member 3 of this embodiment includes the aforementioned transmissive portion 32 and light absorbing portion 33. Specifically, the expandable member 3 of this embodiment includes a first transmissive layer 3a and a second transmissive layer 3b as the transmissive portion 32. Furthermore, the expandable member 3 of this embodiment includes a light absorbing layer 3c as the light absorbing portion 33. This light absorbing layer 3c is located outside the first transmissive layer 3a and the second transmissive layer 3b in the radial direction C and absorbs laser light that has passed through the first transmissive layer 3a and the second transmissive layer 3b.

[0142] In this embodiment, the first permeable layer 3a and the second permeable layer 3b are stacked in this order, from the inner side to the outer side in the radial direction C. The first permeable layer 3a and the second permeable layer 3b may be, for example, transparent resin layers. The second permeable layer 3b may be, for example, a base material layer of the expandable membrane body that constitutes the expandable member 3. The first permeable layer 3a may be, for example, an inner surface layer that constitutes the inner surface of the expandable membrane body that constitutes the expandable member 3, on the inner side in the radial direction C. The inner surface layer serving as the first permeable layer 3a may be provided for purposes such as protecting the inner surface of the expandable membrane body and ensuring flexibility.

[0143] Examples of materials for the first permeable layer 3a and the second permeable layer 3b include polyolefins such as polyethylene, polypropylene, and ethylene-propylene copolymers, polyesters such as polyethylene terephthalate, polyvinyl chloride, ethylene-vinyl acetate copolymers, cross-linked ethylene-vinyl acetate copolymers, thermoplastic resins such as polyurethanes, and polyamides.

[0144] The light absorbing layer 3 c may be, for example, a black rubber layer, a black resin layer, etc. The light absorbing layer 3 c is an outer surface layer constituting the outer side in the radial direction C of the expandable film body constituting the expandable member 3 .

[0145] As described above, the expansion member 3 of this embodiment includes the first transmission layer 3a and the second transmission layer 3b as the transmission portion 32, and the light absorption layer 3c as the light absorption portion 33. The first transmission layer 3a, the second transmission layer 3b, and the light absorption layer 3c are arranged in the order of the first transmission layer 3a, the second transmission layer 3b, and the light absorption layer 3c from the inside to the outside in the radial direction C. As a result, Figure 7 As shown, laser light emitted from the laser irradiation portion 31 of the elongated member 2 penetrates the fluid contained in the containment space 5 and the first and second transmissive layers 3a, 3b of the expandable member 3, and is absorbed by the light-absorbing layer 3c of the expandable member 3. The absorbed laser light generates plasma in the light-absorbing layer 3c. The plasma generated in the light-absorbing layer 3c is easily retained within the light-absorbing layer 3c due to the first and second transmissive layers 3a, 3b covering the inner side of the light-absorbing layer 3c in the radial direction C. This allows the laser-induced shock wave to propagate from the light-absorbing layer 3c outward in the radial direction C, i.e., outside the expandable member 3. In the balloon catheter 1 of this embodiment, the laser-induced shock wave can be caused to collide with the calcified region X within the blood vessel BV, thereby fragmenting the calcified region X.

[0146] Therefore, it is preferable that at least one of the first transmissive layer 3a and the second transmissive layer 3b, which constitute the transmissive portion 32, and the light absorbing layer 3c, which constitutes the light absorbing portion 33, extend over the entire region of the elongated member 2 in the circumferential direction B. This allows the laser-induced shock wave to be transmitted from the light absorbing portion 33 outward in the radial direction C over a wider range in the circumferential direction B.

[0147] Furthermore, as in this embodiment, since the expansion member 3 includes the penetrating portion 32 and the light absorbing portion 33, the laser-induced shock wave transmitted from the light absorbing portion 33 toward the outside in the radial direction C can be applied to the calcified region X without attenuation, compared to a configuration in which the penetrating portion 32 and the light absorbing portion 33 are provided on a long member (see FIG. Figure 1 Therefore, from the viewpoint of suppressing attenuation of the laser-induced shock wave, it is preferable that the penetrating portion 32 and the light absorbing portion 33 are provided in the expansion member 3 .

[0148] The expandable member 3 of this embodiment includes a first transmissive layer 3a and a second transmissive layer 3b as the transmissive portion 32, but the configuration is not limited to this. The expandable member 3 may also include a single transmissive layer as the transmissive portion 32. Furthermore, the expandable member 3 of this embodiment does not include any other layers inwardly of the first transmissive layer 3a and the second transmissive layer 3b as the transmissive portion 32 in the radial direction C, but the configuration is not limited to this. The expandable member 3 may also include another transmissive layer capable of transmitting the laser light emitted from the laser irradiation portion 31. In other words, the expandable member 3 includes only one or more transmissive layers inwardly of the light absorbing layer 3c in the radial direction C.

[0149] In the expansion member 3 of the present embodiment, the light absorbing layer 3c, which serves as the light absorbing portion 33, is the outer surface of the expansion member 3. However, another transmissive layer may be stacked outside the light absorbing layer 3c in the radial direction C. However, it is preferable that the light absorbing layer 3c be the outer surface of the expansion member 3 as in the present embodiment. This can suppress the attenuation of the laser-induced shock wave caused by the other transmissive layer outside the light absorbing layer 3c in the radial direction C.

[0150] <Hub 4>

[0151] like Figure 1 、 Figure 4 As shown, the elongated part 2 is connected to the distal side of the hub 4. A hub inner flow path connected to the flow path 10a of the main part 10 of the elongated part 2 is defined in the hub 4. The fluid can be supplied from the connecting part 4a provided on the proximal side of the hub 4 to the flow path 10a of the main part 10 of the elongated part 2 via the hub inner flow path. In addition, a hub inner insertion hole connected to the guide wire insertion hole 10b of the main part 10 of the elongated part 2 is defined in the hub 4. The guide wire can be inserted into the guide wire insertion hole 10b of the main part 10 of the elongated part 2 via the hub inner insertion hole from the proximal end of the hub inner insertion hole provided on the proximal side of the hub 4, that is, the proximal opening 4b.

[0152] [Second embodiment]

[0153] Next, refer to Figure 8A 、 Figure 8BHere, the balloon catheter 101 is described as another embodiment of the balloon catheter of the present disclosure. Figure 1 The differences between the two components are explained, and the description of the common components is omitted.

[0154] In the balloon catheter 101 of the present embodiment, the laser irradiation portion 31 , the penetrating portion 32 , and the light absorbing portion 33 are provided only on the elongated member 102 . Figure 8A This is an enlarged cross-sectional view showing the position of the expansion member 103 in the cross section of the balloon catheter 101 on a plane including the central axis O and parallel to the central axis O. Figure 8B 1 is a cross-sectional view of the balloon catheter 101 taken on a plane perpendicular to the central axis O at the position of the expansion member 103 . Figure 8A 、 Figure 8B Both show the expansion member 103 in an expanded state.

[0155] like Figure 8A 、 Figure 8B As shown, the elongated member 102 of this embodiment includes a laser irradiation portion 31, a penetrating portion 32, and a light absorbing portion 33. More specifically, the elongated member 102 of this embodiment includes a main body 110 and a laser irradiation body 20. Furthermore, the main body 110 of the elongated member 102 includes the laser irradiation portion 31, the penetrating portion 32, and the light absorbing portion 33.

[0156] The main body 110 includes an inner tube 111 and an outer tube 12. Figure 8A 、 Figure 8B Although the outer tube 12 is not shown in the figure, its structure is the same as that of the first embodiment (see Figure 2 The inner tube 111 is different from the inner tube 11 of the first embodiment (see Figure 3 The difference is that it has a penetrating layer 111b as the penetrating portion 32 and a light absorbing layer 111c as the light absorbing portion 33. The other structures are the same. The inner tube 111 is internally defined as a guide wire insertion hole 110b.

[0157] Specifically, the inner tube 111 of this embodiment includes a base material layer 111 a , a transmissive layer 111 b stacked on the radially outer side of the base material layer 111 a , and a light absorbing layer 111 c stacked on the radially outer side of the transmissive layer 111 b .

[0158] The base material layer 111a can be formed of, for example, the inner tube 11 (see Figure 3 The materials for forming the molecule (e.g., α-D-type molecule) are composed of the materials exemplified above.

[0159] The permeable layer 111b may be formed of, for example, the first permeable layer 3a and the second permeable layer 3b of the expansion member 3 of the first embodiment (see Figure 6) is composed of the materials exemplified as the forming materials.

[0160] The light absorbing layer 111c can be formed of, for example, the light absorbing layer 3c of the expansion member 3 of the first embodiment (see Figure 6 ) is composed of the materials exemplified as the forming materials.

[0161] like Figure 8A 、 Figure 8B As shown, the laser irradiation body 20 is embedded in the peripheral wall of the inner tube 11. More specifically, the laser irradiation body 20 of this embodiment is sandwiched between the base layer 111a and the transmissive layer 111b. The laser irradiation portion 31 of the laser irradiation body 20 is capable of emitting laser light outward in the radial direction C from the outer surface of the base layer 111a of the inner tube 111.

[0162] like Figure 8B As shown, a plurality of laser irradiation bodies 20 including laser irradiation portions 31 are arranged at intervals in the circumferential direction B of the elongated member 102. Consequently, laser light can be emitted from the plurality of laser irradiation portions 31 of the plurality of laser irradiation bodies 20 toward the outside in the radial direction C over a wide range in the circumferential direction B. Consequently, the laser-induced shock wave can be more reliably applied to the calcified region X, not only when the calcified region X is formed over the entire circumferential region of the inner wall of the blood vessel BV, but also when the calcified region X is formed only over a portion of the circumferential region of the inner wall of the blood vessel BV.

[0163] In addition, if Figure 8A As shown, a plurality of laser irradiation bodies 20 including laser irradiation sections 31 are arranged at intervals along the longitudinal direction A of the elongated member 102. This allows laser light to be emitted from the plurality of laser irradiation sections 31 of the plurality of laser irradiation bodies 20 toward the outside in the radial direction C over a wide range in the longitudinal direction A. This allows the laser-induced shock wave to more reliably act on the calcified region X, not only when the calcified region X is formed over a wide range in the direction in which the blood vessel BV extends, but also when the calcified region X is formed only over a narrow range in the direction in which the blood vessel BV extends. The laser irradiation body 20 may also include a laser irradiation section 31 that is elongated in the longitudinal direction A and that can emit a wide laser beam with uniform intensity in the radial direction C regardless of its position in the longitudinal direction A. In this case, the plurality of laser irradiation bodies 20 may not be arranged in the longitudinal direction A.

[0164] like Figure 8A As shown, the laser irradiation unit 20 includes a transmission component 20a including an optical fiber for transmitting light to the laser irradiation unit 31. The configuration position of the transmission component 20a is not particularly limited, and the transmission component 20a can be as follows: Figure 8A As shown, the transmission member 20a is arranged along the inner surface of the inner tube 111. Alternatively, the transmission member 20a may be arranged along a through hole formed in the peripheral wall of the inner tube 111. Figure 8B In the figure, the transmission component 20a is omitted.

[0165] The laser light emitted from the laser irradiation portion 31 of the laser irradiation body 20 passes through the penetrating layer 111b and is absorbed by the light absorbing layer 111c. In the light absorbing layer 111c, plasma is generated by the absorbed laser light. The plasma generated in the light absorbing layer 111c easily stays in the light absorbing layer 111c due to the penetrating layer 111b covering the inner side of the radial direction C of the light absorbing layer 111c. Thus, the laser induced shock wave can be transmitted from the light absorbing layer 111c toward the outer side of the radial direction C, that is, the outside of the long strip part 102. The laser induced shock wave propagates in the fluid contained in the containing space 5 and the expansion part 103, and is transmitted to the outer side of the radial direction C of the expansion part 103. In this way, in the balloon catheter 101 of the present embodiment, the laser induced shock wave can be transmitted to the outer side of the radial direction C of the expansion part 103 by aligning the laser induced shock wave with the blood vessel BV (see Figure 1 Calcification area X (see Figure 1 etc.) to break up the calcified area X.

[0166] In this embodiment, the penetrating portion 32 and the light absorbing portion 33 are provided on the elongated member 102 on the inner side of the radial direction C relative to the expansion member 103. Therefore, the periphery of the penetrating portion 32 and the light absorbing portion 33 is protected by the expansion member 103. Therefore, the expansion and contraction of the expansion member 103 and the contact between the expansion member 103 and the blood vessel BV (see FIG. 1 ) can be suppressed. Figure 1 etc.) or calcified area X (see Figure 1 The penetrating portion 32 and the light absorbing portion 33 may be damaged by contact with the penetrating portion 32 and the light absorbing portion 33. As described above, from the perspective of protecting the penetrating portion 32 and the light absorbing portion 33, it is preferable that the penetrating portion 32 and the light absorbing portion 33 are provided on the long member 102.

[0167] It is preferred that the transmissive layer 111b serving as the transmissive portion 32 and the light absorbing layer 111c serving as the light absorbing portion 33 extend over the entire region of the elongated member 102 in the circumferential direction B. Thus, regardless of the placement of the laser irradiation portion 31 in the circumferential direction B, the laser-induced shock wave can be transmitted outward in the radial direction C from the light absorbing portion 33.

[0168] The inner tube 111 of this embodiment has a three-layer structure consisting of a base layer 111a, a transmissive layer 111b, and a light-absorbing layer 111c, but is not limited to this structure. The inner tube 111 may also have a two-layer structure consisting of only the transmissive layer 111b and the light-absorbing layer 111c. In this case, the laser irradiation body 20 may be attached to the inner surface of the transmissive layer 111b, which constitutes the inner surface of the inner tube 111. Alternatively, the inner tube 111 may include four or more layers, including the transmissive layer 111b and the light-absorbing layer 111c. Even in this case, the inner tube 111 has only one transmissive layer, including at least one transmissive layer 111b, located inward of the light-absorbing layer 111c in the radial direction C, and no other layers. In this embodiment, the light-absorbing layer 111c, serving as the light-absorbing portion 33, is the outermost layer of the inner tube 111. However, other transmissive layers may be layered on the outer side in the radial direction C. However, as in this embodiment, it is preferable that the light absorbing layer 111c is the outer surface layer of the inner tube 111. This can suppress the attenuation of the laser induced shock wave caused by other penetrating layers outside the radial direction C of the light absorbing layer 111c.

[0169] The expansion member 103 of this embodiment is not particularly limited in its configuration as long as it is configured to propagate the laser-induced shock wave transmitted from the light-absorbing layer 111 c of the elongated member 102 from the inside to the outside in the radial direction C. Examples of materials for the expansion member 103 include polyolefins such as polyethylene, polypropylene, and ethylene-propylene copolymers, polyesters such as polyethylene terephthalate, polyvinyl chloride, ethylene-vinyl acetate copolymers, cross-linked ethylene-vinyl acetate copolymers, thermoplastic resins such as polyurethanes, polyamides, polyamide elastomers, silicone rubber, and latex rubber.

[0170] [Third embodiment]

[0171] Next, refer to Figure 9 A balloon catheter 201 as another embodiment of the balloon catheter disclosed herein will be described. Figure 1 The differences between the two components are explained, and the description of the common components is omitted.

[0172] In the balloon catheter 201 of the present embodiment, the laser irradiation portion 31 , the penetrating portion 32 , and the light absorbing portion 33 are provided only in the expansion member 203 . Figure 9 1 is a cross-sectional view of the balloon catheter 201 taken on a plane perpendicular to the central axis O at the position of the expansion member 203 . Figure 9 The expansion member 203 is shown in an expanded state.

[0173] like Figure 9As shown, the strip member 202 of this embodiment is composed of the main body member 10. In other words, the strip member 202 of this embodiment is different from the strip member 2 of the first embodiment (see Figure 2 The only difference between the embodiment and the present embodiment is the presence or absence of the laser irradiation body 20. In other words, the long member 202 of this embodiment does not include the laser irradiation body 20.

[0174] In contrast, the expandable member 203 of this embodiment includes a laser irradiation portion 31, a penetrating portion 32, and a light absorbing portion 33. More specifically, the expandable member 203 of this embodiment includes an expandable body 240 and a laser irradiation body 241 attached to the expandable body 240.

[0175] The structure of the expansion body 240 is similar to that of the expansion member 3 of the first embodiment (see Figure 6 That is, the expansion main body 240 is supported on the outer surface of the long member 202 and can be expanded outward in the radial direction C by supplying fluid to the receiving space 5. In addition, as Figure 9 As shown, the expansion body 240 is formed by stacking a plurality of layers. More specifically, the expansion body 240 includes a first transmissive layer 3 a and a second transmissive layer 3 b as the transmissive portion 32 , and a light absorbing layer 3 c as the light absorbing portion 33 .

[0176] In this embodiment, the expansion member 203 includes a laser irradiation portion 31. More specifically, in this embodiment, the laser irradiation body 241 of the expansion member 203 includes the laser irradiation portion 31. The laser irradiation body 241 may be, for example, a nanosecond pulse laser or a femtosecond pulse laser. The laser irradiation body 241 is attached to the inner surface of the expansion body 240. In this embodiment, a plurality of laser irradiation bodies 241 are arranged at different positions along the longitudinal direction A and the circumferential direction B of the expansion body 240. The laser irradiation portion 31 of the laser irradiation body 241 can emit laser light from the inner surface of the expansion body 240 toward the outside in the radial direction C.

[0177] like Figure 9 As shown, a plurality of laser irradiation bodies 241 including laser irradiation portions 31 are arranged at intervals in the circumferential direction B of the elongated member 202. Consequently, laser light can be emitted from the plurality of laser irradiation portions 31 of the plurality of laser irradiation bodies 241 over a wide range in the circumferential direction B toward the outside in the radial direction C. Consequently, the laser-induced shock wave can more reliably act on the calcified region X, not only when the calcified region X is formed over the entire circumferential region of the inner wall of the blood vessel BV, but also when the calcified region X is formed only in a partial circumferential region of the inner wall of the blood vessel BV.

[0178] In addition, compared with the laser irradiation body 20 of the first embodiment (see Figure 2Similarly, it is preferred that a plurality of laser irradiation bodies 241 including the laser irradiation section 31 are arranged at intervals in the longitudinal direction A of the elongated member 202. Alternatively, the laser irradiation body 241 may include a laser irradiation unit 31 that is elongated in the longitudinal direction A and that can emit a wide laser beam with uniform intensity in the radial direction C regardless of the position in the longitudinal direction A. In this case, a plurality of laser irradiation bodies 241 may not be arranged in the longitudinal direction A.

[0179] like Figure 9 As shown, the laser irradiation body 241 includes a transmission component 241a including an optical fiber for transmitting light to the laser irradiation unit 31. The configuration position of the transmission component 241a is not particularly limited. Figure 9 As shown, the transmission component 241 a may also be disposed along the inner surface of the expansion body portion 240 .

[0180] The laser light emitted from the laser irradiation portion 31 of the laser irradiation body 241 penetrates the first penetrating layer 3a and the second penetrating layer 3b of the expansion main body 240 and is absorbed by the light absorbing layer 3c. In the light absorbing layer 3c, plasma is generated by the absorbed laser light. The plasma generated in the light absorbing layer 3c easily stays in the light absorbing layer 3c due to the first penetrating layer 3a and the second penetrating layer 3b covering the radial inner side C of the light absorbing layer 3c. Thus, the laser induced shock wave can be transmitted from the light absorbing layer 3c toward the radial outer side C, that is, the outside of the expansion component 203. In this way, in the balloon catheter 201 of the present embodiment, the laser induced shock wave can be transmitted to the blood vessel BV (see Figure 1 Calcification area X (see Figure 1 etc.) collide and break the calcified area X.

[0181] Preferably, at least one of the first transmissive layer 3a and the second transmissive layer 3b serving as the transmissive portion 32 and the light absorbing layer 3c serving as the light absorbing portion 33 extend over the entire region of the elongated member 202 in the circumferential direction B. Thus, regardless of the arrangement position of the laser irradiation portion 31 in the circumferential direction B, the laser-induced shock wave can be transmitted outward in the radial direction C from the light absorbing portion 33.

[0182] [Fourth embodiment]

[0183] Next, refer to Figure 10 、 Figure 11A 、 Figure 11B A balloon catheter 301 as another embodiment of the balloon catheter disclosed herein will be described. The balloon catheter 301 of this embodiment is different from the balloon catheter 1 of the first embodiment (see Figure 1 The difference lies in the composition of the long strip member 302, and the other compositions are the same. Here, the balloon catheter 301 is compared with the balloon catheter 1 of the first embodiment (see Figure 1The differences between the two components are explained, and the description of the common components is omitted.

[0184] Figure 10 This is an enlarged cross-sectional view showing the position of the expansion member 3 in the cross section of the balloon catheter 301 on a plane including the central axis O and parallel to the central axis O. Figure 11A 、 Figure 11B 3 is a cross-sectional view of the balloon catheter 301 taken on a plane perpendicular to the central axis O at the position of the expansion member 3 . Figure 11B Shown from Figure 11A The state shown is a state in which the sleeve member 350 of the elongated member 302 is rotated relative to the main body member 10 of the elongated member 302 in the circumferential direction B.

[0185] like Figure 10 、 Figure 11A 、 Figure 11B As shown, the elongated member 302 of this embodiment includes a main body member 10 and a sleeve member 350. The main body member 10 supports the expansion member 3 on its outer surface. Since the main body member 10 has the same structure as that of the first embodiment, its description is omitted here.

[0186] The sleeve member 350 is mounted on the body member 10 so as to be relatively rotatable in the circumferential direction B. More specifically, the sleeve member 350 surrounds the radially outer side of the inner tube 11 of the body member 10 and is supported on the outer surface of the inner tube 11 .

[0187] More specifically, the sleeve member 350 of the present embodiment includes an annular sleeve body 351 and a laser irradiation body 352 attached to the annular sleeve body 351 .

[0188] The sleeve body 351 is supported on the outer surface of the inner tube 11 so as to be rotatable relative to the inner tube 11 in the circumferential direction B. The sleeve body 351 extends along the longitudinal direction A between the outer surface of the inner tube 11 and the inner surface of the outer tube 12 at the location where the outer tube 12 is provided. The distal end of the sleeve body 351 is located on the outer surface of the inner tube 11, closer to the position where it engages with the expansion member 3. More specifically, the distal end of the sleeve body 351 is located within the housing space 5 of the expansion member 3. While supported on the outer surface of the inner tube 11, the sleeve body 351 is in sliding contact with the outer surface of the inner tube 11, thereby being rotatable relative to the inner tube 11 and the outer tube 12 in the circumferential direction B.

[0189] In this embodiment, the sleeve member 350 includes the laser irradiation portion 31. More specifically, in this embodiment, the laser irradiation body 352 of the sleeve member 350 includes the laser irradiation portion 31. Figure 10 、 Figure 11A 、 Figure 11BAs shown, the laser irradiation body 352 of this embodiment is mounted on the sleeve body 351. More specifically, the laser irradiation body 352 of this embodiment is mounted on the outer surface of the sleeve body 351. In this embodiment, only one laser irradiation body 352 is mounted on the outer surface of the sleeve body 351. The laser irradiation body 352 can be, for example, a nanosecond pulse laser or a femtosecond pulse laser. The laser irradiation portion 31 of the laser irradiation body 352 can emit laser light from the outer surface of the sleeve body 351 toward the outside in the radial direction C.

[0190] As described above, the laser irradiation section 31 of this embodiment is provided on the sleeve member 350 that can rotate relative to the main body member 10. Therefore, the position of the laser irradiation section 31 in the circumferential direction B can be changed by rotating the sleeve member 350 relative to the main body member 10. In other words, medical workers such as doctors can control the emission direction of the laser light emitted from the laser irradiation section 31 by operating the sleeve member 350. Therefore, in the blood vessel BV (see Figure 1 Calcification area X (see Figure 1 For example, when the calcified area X is only partially located in the circumferential direction of the inner wall of the blood vessel BV, the laser irradiation unit 31 can be aligned with the position of the calcified area X by operating the sleeve member 350. Thus, even if the calcified area X is partially located in the circumferential direction of the inner wall of the blood vessel BV, the laser induced shock wave can be locally transmitted to the calcified area X.

[0191] like Figure 10 As shown, the laser irradiation body 352 includes a transmission component 352a including an optical fiber for transmitting light to the laser irradiation unit 31. The configuration position of the transmission component 352a is not particularly limited. Figure 10 As shown, the transmission component 352a can be configured along the outer surface of the sleeve body 351. Figure 11A 、 Figure 11B In the figure, the transmission component 352a is omitted.

[0192] like Figure 10 As shown, in the balloon catheter 301 of this embodiment, a marking member 353 is preferably attached to the distal end of the inner tube 11 of the main body 10 of the elongated member 302, indicating the position of the laser irradiation portion 31 in the circumferential direction B. The marking member 353 has X-ray contrast properties. Specifically, the marking member 353 is formed of a material with high X-ray opacity. Specifically, the marking member 353 can be made of a material with high X-ray opacity, such as platinum, gold, iridium, or tungsten.

[0193] In addition, the sleeve part 350 of the present embodiment is configured to be rotatable relative to the main body part 10 in the circumferential direction B and movable relative to the main body part 10 in the longitudinal direction A. That is, in the present embodiment, by rotating the sleeve part 350 relative to the main body part 10 in the circumferential direction B, the position of the laser irradiation part 31 in the circumferential direction B can be changed as described above. In addition, in the present embodiment, by moving the sleeve part 350 in the longitudinal direction A relative to the main body part 10, the position of the laser irradiation part 31 in the longitudinal direction A can be changed. That is, according to the elongated part 302 of the present embodiment, the position of the laser irradiation part 31 can be changed in the longitudinal direction A and the circumferential direction B. Therefore, for example, by rotating the sleeve part 350 relative to the main body part 10 in the circumferential direction B while moving the sleeve part 350 relative to the main body part 10 in the longitudinal direction A, even if only one laser irradiation body 352 is provided, it is possible to position the laser irradiation part 31 in the blood vessel BV (see Figure 1 In other words, even with only one laser irradiation body 352, the laser induced shock wave can act on the calcified area X in the blood vessel BV (see Figure 1 etc.) in a wide range.

[0194] The operation of the sleeve component 350 can be performed manually by medical workers such as doctors, or can be performed electrically using a driving device.

[0195] In addition, the sleeve part 350 of this embodiment has only one laser irradiation body 352, but is not limited to this structure. The sleeve part 350 can have a plurality of laser irradiation bodies 352 provided with independent laser irradiation parts 31. For example, the sleeve part 350 can have a plurality of laser irradiation bodies 352 at different positions on the circumferential direction B. The plurality of laser irradiation bodies 352 are arranged at equal intervals over the entire range on the circumferential direction B, for example. In this case, for example, there is no need to rotate the sleeve part 350 relative to the main part 10 in the circumferential direction B. Instead, by moving the sleeve part 350 in the longitudinal direction A relative to the main part 10, it is possible to move the sleeve part 350 in the longitudinal direction A in the blood vessel BV (see Figure 1 The laser-induced shock wave is transmitted to the entire circumference of the inner wall of the blood vessel BV within a specified range of the extending direction of the laser beam, etc.

[0196] Furthermore, in the expansion member 3, it is preferred that at least one of the first transmissive layer 3a and the second transmissive layer 3b, which serve as the transmissive portion 32, and the light absorbing layer 3c, which serves as the light absorbing portion 33, extend over the entire region in the circumferential direction B of the elongated member 302. Thus, by rotating the sleeve member 350, the laser-induced shock wave can be transmitted from the light absorbing portion 33 outward in the radial direction C over the entire circumferential direction B.

[0197] In addition, if Figure 11A As shown in the embodiment, the sleeve member 350 is provided with a laser irradiation portion 31 and the expansion member 3 is provided with a penetrating portion 32 and a light absorbing portion 33, but the present invention is not limited to this configuration. The sleeve member may also be provided with a laser irradiation portion 31, a penetrating portion 32 and a light absorbing portion 33 (see Figure 12 ).

[0198] [Fifth embodiment]

[0199] Next, refer to Figure 12 The balloon catheter 401 as another embodiment of the balloon catheter disclosed in the present invention is described. The balloon catheter 401 of this embodiment is different from the balloon catheter 301 of the fourth embodiment (see Figure 10 The difference lies in the composition of the long member 402 and the expansion member 403. Here, the balloon catheter 401 is compared with the balloon catheter 301 of the fourth embodiment (see Figure 10 The differences between the two components are explained, and the description of the common components is omitted.

[0200] Figure 12 4 is a cross-sectional view of the balloon catheter 401 on a plane perpendicular to the central axis O at the position of the expansion component 403. Figure 12 As shown, the balloon catheter 401 includes a long member 402 and an expansion member 403. The expansion member 403 is supported on the outer surface of the long member 402 and can be expanded outward in the radial direction C by supplying fluid to the accommodation space 5. Figure 12 1 shows the expansion member 403 in the expanded state. The expansion member 403 of this embodiment has the same structure as the expansion member 103 of the second embodiment, and therefore, the description thereof is omitted here.

[0201] The long member 402 includes a main body member 10 and a sleeve member 450. The main body member 10 has the same configuration as that of the fourth embodiment, and therefore its description is omitted here.

[0202] The sleeve member 450 of this embodiment includes a laser irradiation portion 31 , a penetrating portion 32 , and a light absorbing portion 33 .

[0203] Specifically, the sleeve member 450 of this embodiment includes a sleeve body 451 and a laser irradiation body 452. The sleeve body 451 of this embodiment includes a base material layer 451a, a penetrating layer 451b stacked on the radially outer side of the base material layer 451a as the penetrating portion 32, and a light absorbing layer 451c stacked on the radially outer side of the penetrating layer 451b as the light absorbing portion 33.

[0204] The base material layer 451a can be made of, for example, the inner tube 11 (see Figure 3 The materials for forming the molecule (e.g., α-D-type molecule) are composed of the materials exemplified above.

[0205] The permeable layer 451b can be formed of, for example, the first permeable layer 3a and the second permeable layer 3b of the expansion member 3 of the first embodiment (see Figure 6 ) is composed of the materials exemplified as the forming materials.

[0206] The light absorbing layer 451c can be formed, for example, from the light absorbing layer 3c of the expansion member 3 of the first embodiment (see Figure 6 ) is composed of the materials exemplified as the forming materials.

[0207] The laser irradiation body 452 of this embodiment is embedded in the peripheral wall of the sleeve body 451. More specifically, the laser irradiation body 452 of this embodiment is sandwiched between the base layer 451a and the transmissive layer 451b. The laser irradiation portion 31 of the laser irradiation body 452 is capable of emitting laser light outward in the radial direction C from the outer surface of the base layer 451a of the sleeve body 451.

[0208] like Figure 12 As shown, the laser irradiation body 452 includes a transmission component 452a including an optical fiber for transmitting light to the laser irradiation unit 31. The configuration position of the transmission component 452a is not particularly limited, for example, Figure 12 As shown, the transmission component 452a can be configured along the inner surface of the sleeve body 451.

[0209] The laser light emitted from the laser irradiation portion 31 of the laser irradiation body 452 penetrates the penetrating layer 451b and is absorbed by the light absorbing layer 451c. In the light absorbing layer 451c, plasma is generated by the absorbed laser light. The plasma generated by the light absorbing layer 451c easily stays in the light absorbing layer 451c due to the penetrating layer 451b covering the inner side of the radial direction C of the light absorbing layer 451c. Thus, the laser induced shock wave can be transmitted from the light absorbing layer 451c toward the outer side of the radial direction C, that is, the outside of the sleeve part 450. The laser induced shock wave propagates in the fluid contained in the containing space 5 and the expansion part 403 and is transmitted to the outer side of the radial direction C of the expansion part 403. In this way, in the balloon catheter 401 of the present embodiment, the laser induced shock wave can be transmitted to the outer side of the radial direction C of the expansion part 403 by aligning the laser induced shock wave with the blood vessel BV (see Figure 1 Calcification area X (see Figure 1 etc.) to break up the calcified area X.

[0210] In this embodiment, in the sleeve body 451, the transmissive layer 451b serving as the transmissive portion 32 and the light absorbing layer 451c serving as the light absorbing portion 33 preferably extend over the entire region in the circumferential direction B of the elongated member 402. Thus, regardless of the position of the laser irradiation portion 31 relative to the sleeve body 451 in the circumferential direction B, the laser-induced shock wave can be transmitted outward in the radial direction C from the light absorbing portion 33.

[0211] The sleeve body 451 of the sleeve component 450 in this embodiment comprises a three-layer structure consisting of a base material layer 451a, a transmissive layer 451b, and a light-absorbing layer 451c, but is not limited to this structure. The sleeve body 451 may also comprise a two-layer structure consisting solely of the transmissive layer 451b and the light-absorbing layer 451c. In this case, the laser irradiation element 452 may be attached to the inner surface of the transmissive layer 451b, which constitutes the inner surface of the sleeve body 451. Alternatively, the sleeve body 451 may comprise four or more layers, including the transmissive layer 451b and the light-absorbing layer 451c. Even in this case, the sleeve body 451 comprises only at least one transmissive layer, including the transmissive layer 451b, on the radially inner side of the light-absorbing layer 451c, and has no layers other than the transmissive layer. In this embodiment, the light-absorbing layer 451c, serving as the light-absorbing portion 33, is the outermost layer of the sleeve body 451. However, other transmissive layers may be laminated on the outer side of the transmissive layer 451c in the radial direction C. However, as in this embodiment, the light absorbing layer 451c is preferably formed as the outer surface layer of the sleeve body 451. This can suppress attenuation of the laser-induced shock wave caused by other penetrating layers outside the light absorbing layer 451c in the radial direction C.

[0212] The balloon catheter disclosed herein is not limited to the specific configurations shown in the above embodiments, and various modifications, changes, and combinations are possible without departing from the scope of the claims.

[0213] Figure 13 This is a diagram showing a balloon catheter 501 which is a modified example of the balloon catheter 301 according to the fourth embodiment. Figure 13 The illustrated balloon catheter 501 differs from the balloon catheter 301 of the fourth embodiment described above in that the laser irradiation body 552 is of a full-circumference irradiation type, and the sleeve body 551 of the sleeve member 550 of the elongated member 502 and the inner tube 511 of the main body member 510 of the elongated member 502 are configured to allow the laser light emitted from the laser irradiation body 552 to pass through. The other structures are identical. Therefore, only the aforementioned differences will be described here.

[0214] The laser irradiation unit 552 of the full-circle irradiation type can be, for example, a radial optical fiber. The laser irradiation unit 552 of the full-circle irradiation type can emit laser light radially from the laser irradiation unit 552 in the entire circumference direction B. The laser irradiation unit 552 includes a transmission member 552a including an optical fiber for transmitting light to the laser irradiation unit 31.

[0215] like Figure 13As shown, in this example, the full-circumference irradiation type laser irradiation element 552 is attached only to a portion of the sleeve body 551 along the circumference direction B. Therefore, the laser light from the laser irradiation portion 31 of the laser irradiation element 552 is difficult to reach the area of ​​the expansion member 3 where the sleeve body 551 of the sleeve member 550 and the inner tube 511 of the main body 510 are sandwiched between the laser irradiation portion 31 of the laser irradiation element 552. Therefore, the portions of the sleeve member 550 and the main body 510 sandwiched between the laser irradiation portion 31 and the expansion member 3 are configured to allow the laser light emitted from the laser irradiation portion 31 to pass through. Specifically, in this example, the portions of the sleeve body 551 of the sleeve member 550 and the inner tube 511 of the main body 510 sandwiched between the laser irradiation element 552 and the expansion member 3 are configured to allow the laser light emitted from the laser irradiation portion 31 to pass through. This allows the radial laser light emitted from the laser irradiation portion 31 of the laser irradiation element 552 to easily reach the entire circumference direction B of the expansion member 3. It should be noted that, in this example, a portion of both the sleeve member 550 and the main body member 510 is configured to allow the laser light emitted from the laser irradiation portion 31 to pass through, but the present invention is not limited to this configuration. Alternatively, when only one of the sleeve member 550 and the main body member 510 is sandwiched between the laser irradiation portion 31 and the expansion member 3, only one of the sandwiched members can allow the laser light emitted from the laser irradiation portion 31 to pass through (see Figure 14 ).

[0216] The sleeve body 551 and the inner tube 511 are not particularly limited in their configuration as long as they can transmit the laser light emitted from the laser irradiation unit 552. Examples of the sleeve body 551 and the inner tube 511 include transparent materials made of polymer materials such as polyolefins (e.g., polyethylene, polypropylene, polybutene, ethylene-propylene copolymers, ethylene-vinyl acetate copolymers, ionomers, or mixtures of two or more thereof), polyvinyl chloride, polyamide, polyamide elastomer, polyurethane, polyurethane elastomer, polyimide, and fluororesins, or mixtures thereof.

[0217] By adopting such a configuration, even if only one laser irradiation body 552 is provided, it is not necessary to rotate the sleeve member 550 relative to the main body member 510 in the circumferential direction B. Instead, the sleeve member 550 can be moved relative to the main body member 510 in the longitudinal direction A to thereby achieve the desired effect in the blood vessel BV (see FIG. Figure 1 Therefore, in this example, the sleeve member 550 may also be configured to be non-rotatable in the circumferential direction B relative to the main body member 510.

[0218] However, the sleeve member 550 may be configured to be rotatable relative to the main body member 510 in the circumferential direction B. Furthermore, in this example, only one laser irradiation unit 552 is provided for irradiating the entire circumference, but the present invention is not limited to this configuration. For example, two laser irradiation units 552 may be provided at opposing positions in the radial direction C, or multiple laser irradiation units 552 may be provided at different positions in the circumferential direction B.

[0219] In addition, Figure 13 The example in which the laser irradiation body 552 of the full-circle irradiation type is mounted on the outer surface of the sleeve body 551 in the radial direction C is shown, but the present invention is not limited to this configuration. Figure 14 As shown, for example, the laser irradiation body 552 of the full-circumference irradiation type may be attached to the distal end of the sleeve body 551 so as to protrude in the distal direction A1 from the distal end of the sleeve body 551. In this case, at least the inner tube 511 of the sleeve body 551 and the inner tube 511 is configured to allow the laser light emitted from the laser irradiation body 552 to pass through.

[0220] also, Figure 15 This is a diagram showing a balloon catheter 601 that is another modified example of the balloon catheter 301 according to the fourth embodiment. Figure 15 The illustrated balloon catheter 601 differs from the balloon catheter 301 of the fourth embodiment described above in that the transmission member 652a for transmitting light to the laser irradiation portion 31 of the laser irradiation unit 352 is configured to transmit laser beams of varying output power. More specifically, the transmission member 652a is a double-clad optical fiber. The remaining configurations are identical. Therefore, only these differences will be described here.

[0221] like Figure 16 It is a cross-sectional view of a double-clad optical fiber serving as the transmission member 652a. Figures 17 to 19 Is shown using Figure 15 The balloon catheter 601 shown is continuously used to treat the calcified area X (see FIG. Figure 1 ) is a diagram of an example of a surgical procedure for shattering and diagnosing the target site after treatment.

[0222] like Figure 16 As shown, the double-clad optical fiber serving as the transmission component 652a includes a core 652a1, an inner cladding 652a2 covering the radially outer side of the core 652a1, and an outer cladding 652a3 covering the radially outer side of the inner cladding 652a2. The refractive index of the core 652a1 is higher than that of the inner cladding 652a2 and higher than that of the outer cladding 652a3. In addition, the refractive index of the inner cladding 652a2 is higher than that of the outer cladding 652a3. According to such a double-clad optical fiber, a high-output treatment laser LS1 (see Figure 17 ) is transmitted and can propagate the diagnostic laser LS2 in the core 652a1 (see Figure 19 In other words, the laser irradiation unit 31 can be used to emit the treatment laser LS1 and can be used to transmit and receive the diagnostic laser LS2 used to obtain diagnostic images of the target area after treatment based on OCT (Optical Coherence Tomography) and OFDI (Optical Frequency Domain Imaging).

[0223] Next, refer to Figures 17 to 19 The calcified region X (see FIG. 1 ) as the target site for continuous treatment using the balloon catheter 601 will be described. Figure 1 ) is an example of a surgical procedure for diagnosing the target site after fragmentation and treatment. Figure 17 It is shown from Figure 15 The state shown is a diagram showing a state in which the treatment of the target site by the treatment laser LS1 is completed. More specifically, Figure 17 It is shown from Figure 15 The state shown in FIG. 1 is a state in which the sleeve member 350 is moved relative to the main body member 10 in the proximal direction A2 of the longitudinal direction A while rotating the sleeve member 350 relative to the main body member 10 in the circumferential direction B. During this movement, the treatment laser LS1 emitted from the laser irradiation unit 31 can be used to treat the blood vessel BV (see FIG. Figure 1 The laser-induced shock wave is transmitted to the entire circumference of the inner wall of the blood vessel BV within a predetermined range of the extending direction of the laser beam. Figure 17 In FIG. 1 , the sleeve member 350 is shown in dotted lines. Figure 15 Move the position shown to Figure 17 The treatment laser LS1 is emitted midway to the position shown. Thus, the calcified area X in the blood vessel BV can be treated as the target site (see Figure 1 ) is broken.

[0224] Figure 18 It is shown that the sleeve member 350 is Figure 17 The position shown returns Figure 15 More specifically, Figure 18 It is shown that the sleeve member 350 is Figure 17 The state shown is moved in the distal direction A1 relative to the main body part 10 in the longitudinal direction A and returns to Figure 16 During this movement, the treatment laser LS1 is not emitted from the laser irradiation unit 31 (see Figure 17 ) and diagnostic laser LS2 (see Figure 19 ) In addition, during this movement, the sleeve member 350 moves in the distal direction A1 relative to the main body member 10 without rotating in the circumferential direction B.

[0225] Figure 19 The diagram shows the process of obtaining a diagnostic image of the target site after treatment. Figure 18 The state shown in FIG completes the state of the diagnosis laser LS2 transmission and reception. More specifically, Figure 19 It is shown that the sleeve member 350 is Figure 18 The state shown is a diagram showing a state in which the sleeve member 350 is rotated in the circumferential direction B relative to the main body member 10 while moving again in the proximal direction A2 of the longitudinal direction A relative to the main body member 10. During this movement, the laser irradiation unit 31 transmits and receives the diagnostic laser LS2. Figure 19 In FIG. 1 , the sleeve member 350 is shown in dotted lines. Figure 18 Move the position shown to Figure 19 The diagnostic laser LS2 is transmitted and received midway to the position shown. This allows for acquisition of diagnostic images of the target site after treatment. In other words, balloon catheter 601 allows acquisition of diagnostic images of the target site after treatment without removing balloon catheter 601 from the body.

[0226] Thus, by using the double-clad optical fiber as the transmission means 652a, treatment of a target site and diagnosis of the target site after treatment can be performed continuously.

[0227] Industrial applicability

[0228] The present disclosure relates to balloon catheters.

[0229] Description of Reference Numerals

[0230] 1: Balloon catheter

[0231] 2: Long parts

[0232] 3: Expansion components

[0233] 3a: First penetrating layer (an example of a penetrating portion)

[0234] 3b: Second penetration layer (an example of a penetration portion)

[0235] 3c: Light absorbing layer (an example of a light absorbing portion)

[0236] 4: Hub

[0237] 4a: Connection

[0238] 4b: Proximal opening

[0239] 5: Containment Space

[0240] 10: Main body

[0241] 10a: Flow path

[0242] 10b: Guidewire insertion hole

[0243] 11: Inner tube

[0244] 12: External tube

[0245] 13: Marking parts

[0246] 20: Laser irradiation

[0247] 20a: Transmission components

[0248] 31: Laser irradiation part

[0249] 32: Penetration

[0250] 33: Light absorption part

[0251] 101: Balloon Catheter

[0252] 102: Long parts

[0253] 103: Expansion components

[0254] 110: Main body

[0255] 110b: Guidewire insertion hole

[0256] 111: Inner tube

[0257] 111a: base material layer

[0258] 111b: Penetrating layer (an example of a penetrating portion)

[0259] 111c: Light absorbing layer (an example of a light absorbing portion)

[0260] 201: Balloon Catheter

[0261] 202: Long parts

[0262] 203: Expansion components

[0263] 240: Expand the main body

[0264] 241: Laser irradiation

[0265] 241a: Transmission components

[0266] 301: Balloon Catheter

[0267] 302: Long parts

[0268] 350: Sleeve parts

[0269] 351: Sleeve body

[0270] 352: Laser irradiation

[0271] 352a: Transmission components

[0272] 353: Marking parts

[0273] 401: Balloon Catheter

[0274] 402: Long parts

[0275] 403: Expansion component

[0276] 450: Sleeve parts

[0277] 451: Sleeve body

[0278] 451a: Base material layer

[0279] 451b: Penetrating layer (an example of a penetrating portion)

[0280] 451c: Light absorbing layer (an example of a light absorbing portion)

[0281] 452: Laser irradiation

[0282] 452a: Transmission components

[0283] 501: Balloon Catheter

[0284] 502: Long parts

[0285] 510: Main body

[0286] 511: Inner tube

[0287] 550: Sleeve parts

[0288] 551: Sleeve body

[0289] 552: Laser irradiation

[0290] 552a: Transmission components

[0291] 601: Balloon Catheter

[0292] 652a: Transmission components

[0293] 652a1: core

[0294] 652a2: inner cladding

[0295] 652a3: outer cladding

[0296] A: Length direction

[0297] A1: distal direction

[0298] A2: Near direction

[0299] B: Circumferential

[0300] C: Radial

[0301] BV: Blood vessels

[0302] L1: Irradiation range of the light absorbing part irradiated by the laser beam from the laser irradiation part

[0303] Connecting area

[0304] LS1: Disposal Laser

[0305] LS2: Diagnostic laser

[0306] O: Center axis

[0307] X: Calcification area

Claims

1. A balloon catheter, characterized in that: include: Long parts; as well as an expansion member supported on the outer surface of the elongated member and capable of expanding radially outward of the elongated member; The balloon catheter is provided with: a laser irradiation portion capable of emitting laser light toward the outside in the radial direction; a penetrating portion that allows the laser light emitted from the laser irradiation portion to penetrate in the radial direction; and a light absorbing portion capable of absorbing the laser light that has passed through the penetrating portion, The laser irradiation portion, the penetrating portion, and the light absorbing portion are provided only on the elongated member, only on the expansion member, or separately on both the elongated member and the expansion member.

2. The balloon catheter according to claim 1, wherein The long member includes the laser irradiation portion, The expansion member includes the penetration portion and the light absorbing portion.

3. The balloon catheter according to claim 2, wherein: The long strip component includes: a body member supporting the expansion member on an outer surface; and a sleeve member mounted on the main body member so as to be rotatable relative to the main body member in the circumferential direction; The sleeve member includes the laser irradiation portion. The balloon catheter according to claim 3 , wherein: The sleeve member is mounted on the main body member so as to be relatively movable with respect to the main body member in the longitudinal direction of the elongated member. The balloon catheter according to claim 2 , wherein: The long strip component includes: a body member supporting the expansion member on an outer surface; and a sleeve component mounted on the main body component, The sleeve member includes the laser irradiation portion, The laser irradiation unit is of a full-circle irradiation type that emits radial laser light. The balloon catheter according to claim 5 , wherein: A portion of the sleeve member and / or the main body member, which is interposed between the laser irradiation portion and the expansion member, is configured to allow the laser light emitted from the laser irradiation portion to pass therethrough.

7. The balloon catheter according to claim 1, wherein: A transmission member is provided that is connected to the laser irradiation unit and transmits light. The transmission member has a structure capable of transmitting laser beams of different outputs. The balloon catheter according to claim 7 , wherein: The transmission member is a double-clad optical fiber capable of propagating treatment laser light and diagnosis laser light.

9. The balloon catheter according to any one of claims 2 to 4, wherein: The expansion component comprises: a penetrating layer as the penetrating portion, which enables the laser to penetrate in the radial direction; and The light absorbing layer serving as the light absorbing portion is located outside the transmission layer in the radial direction and absorbs the laser light transmitted through the transmission layer.

10. The balloon catheter according to claim 1, wherein The long member includes the laser irradiation portion, the penetrating portion, and the light absorbing portion. The balloon catheter according to claim 10 , wherein: The long strip component includes: a body member supporting the expansion member on an outer surface; and a sleeve member mounted on the main body member so as to be rotatable relative to the main body member in the circumferential direction; The sleeve component includes the laser irradiation portion, the penetrating portion, and the light absorbing portion.

12. The balloon catheter according to claim 11, wherein The sleeve member is mounted on the main body member so as to be relatively movable with respect to the main body member in the longitudinal direction of the elongated member.

13. The balloon catheter according to claim 1, wherein The expansion member includes the laser irradiation portion, the penetrating portion, and the light absorbing portion. The balloon catheter according to claim 13 , wherein: The expansion component comprises: an expansion main body formed by stacking a plurality of layers; and a laser irradiation body mounted on the expansion main body; The laser irradiation body includes the laser irradiation portion, The expansion main body comprises: a penetrating layer as the penetrating portion, which enables the laser to penetrate in the radial direction; and The light absorbing layer serving as the light absorbing portion is located outside the transmission layer in the radial direction and absorbs the laser light transmitted through the transmission layer.

15. The balloon catheter according to any one of claims 1 to 4, wherein: The penetrating portion and the light absorbing portion extend over the entire circumference of the long member.

16. The balloon catheter according to any one of claims 1 to 4, wherein: A plurality of the laser irradiation units are arranged at intervals in the circumferential direction of the long member.

Images