Shockwave plasty catheter

Abstract

The invention provides a shock wave plasty catheter, and relates to the technical field of medical instruments, the shock wave plasty catheter comprises an inner tube, an outer tube and an electrode assembly, the outer tube comprises a straight tube section and a conical tube section at the far end; the electrode assembly comprises an inner electrode, an insulating part and an outer electrode which are sequentially arranged from inside to outside in the radial direction, the outer electrode is fixedly arranged in the straight pipe section, and the far end of the outer electrode extends into the liquid storage cavity. According to the invention, the movable inner electrode is arranged, the insulating part is arranged between the inner electrode and the outer electrode, and the discharge gap distance is adjusted by moving the inner electrode, so that the energy of released shock waves can be flexibly adjusted. Besides, the far end of the inner electrode is located at the far end of the outer electrode, so that a certain included angle is formed between the discharge gap and the axis of the inner tube, the position of the inner electrode is changed, the direction of the discharge gap is correspondingly changed, and the release direction of shock waves is changed.

Description

Technical Field

[0001] The invention relates to the technical field of medical devices, in particular to a shock wave angioplasty catheter. Background Art

[0002] Angioplasty balloons are often used to open calcified lesions in the blood vessel wall and restore normal blood flow in the blood vessel. With the development of electrohydraulic lithotripsy technology in recent years, shock wave angioplasty catheters have gradually been used in the vascular system to treat calcified lesions in blood vessels. The shock wave angioplasty catheter is an angioplasty catheter with one or more electrode assemblies set inside it. When the catheter is implanted close to the lesion, the catheter is filled with a liquid medium to make it contact the lesion site, and a pulsed driving current is provided to the electrode assembly, which can release omnidirectional, intermittent shock wave energy outward. The shock wave energy propagates outward through the liquid medium in the catheter and hits the calcified lesion area, causing the calcified lesion area to shift internally or even rupture, restoring the compliance of the blood vessel and achieving a lithotripsy effect. The blood vessel with restored compliance can make the therapeutic effect of angioplasty balloon or stent implantation more obvious.

[0003] To this end, the prior art records a number of shock wave angioplasty catheter structures with low-profile designs, so that the shock wave angioplasty catheter can pass through the narrow part in the blood vessel more easily.

[0004] However, since the discharge position and discharge gap of the electrode pair in the prior art are usually fixed, the shock wave energy and angle cannot be flexibly adjusted, which in turn affects the lithotripsy effect and is difficult to apply to the treatment of severe / completely occluded lesions. Summary of the invention

[0005] In view of this, an object of the present invention is to provide a shock wave angioplasty catheter to solve the technical problem that the discharge position and discharge gap of the electrode pair in the shock wave angioplasty catheter in the prior art are usually fixed, making it difficult to apply to the treatment of severe / completely occluded lesions.

[0006] In order to achieve the above-mentioned object, the present invention provides a shock wave angioplasty catheter, comprising an inner tube body, an outer tube body and an electrode assembly arranged between the inner tube body and the outer tube body, wherein the outer tube body is sleeved on the inner tube body, comprising a straight tube section and a tapered tube section connected to the distal end of the straight tube section, wherein the radial dimension of the tapered tube section gradually decreases from the proximal end to the distal end, and the distal end of the tapered tube section is contracted to be sealed and connected to the outer wall of the inner tube body, forming a liquid storage cavity that can be filled with a liquid medium;

[0007] An electrode assembly, comprising an inner electrode, an insulating member and an outer electrode which are sequentially arranged radially outward from the outer wall of the inner tube body, wherein the outer electrode is fixedly arranged in the straight tube section, and the distal end of the outer electrode extends into the liquid storage cavity; the inner electrode is movably arranged inside the outer electrode from the proximal end of the inner tube body, the distal end of the inner electrode passes through the outside of the outer electrode and extends into the liquid storage cavity, and the inner electrode can reciprocate along the extension direction of the inner tube body; the insulating member is arranged between the inner electrode and the outer electrode and has elasticity in the axial direction, the distal end of the insulating member is in contact with the inner electrode and is used to isolate the inner electrode and the outer electrode, so that a discharge gap is formed between the distal end of the inner electrode and the distal end of the outer electrode, and the discharge gap is the shortest distance between the conductors on the inner electrode and the outer electrode;

[0008] When the inner electrode is moved toward the proximal end, the insulating member can be compressed axially toward the proximal end. When the tension applied to the inner electrode is removed, the insulating member can be extended axially toward the distal end, so that the distance of the discharge gap is in the range of 0.01 to 3 mm. When a pulsed high voltage is applied between the electrode assemblies, a shock wave is generated between the discharge gaps and can be transmitted outward through the liquid medium in the liquid storage chamber.

[0009] According to an optional implementation, the insulating member is made of at least one of silicone, PI, peek, and nylon.

[0010] According to an optional embodiment, the tapered tube section of the outer tube body is made of at least one material selected from nylon, PTFE, PET, PEEK, PEBAX, and PI, and the tube wall thickness of the tapered tube section is 0.01 to 0.20 mm.

[0011] According to an optional embodiment, the radial dimension of the straight tube section of the outer tube body is 0.8 to 2.0 mm, and the taper range of the tapered tube section is 15 to 60 degrees.

[0012] According to an optional embodiment, the inner electrode includes a main body and a conductive part, the main body extends axially along the inner tube body, the conductive part is vertically connected to the distal end of the main body and extends radially outward along the inner tube body, the conductive part abuts against the distal end wall of the insulating member, and a discharge gap is formed between the end of the conductive part and the distal end of the outer electrode.

[0013] According to an optional embodiment, the inner electrode has an L-shaped rod-shaped structure, the main body and the conductive part are both slender rod-shaped structures, and there are multiple inner electrodes, which are evenly arranged on the outside of the inner tube body along the circumferential direction.

[0014] According to an optional embodiment, the radial cross-section of the main body of the inner electrode is rectangular or elliptical, with a thickness of 0.05 to 0.2 mm and a width of 0.1 to 0.3 mm; and the Vickers hardness is 150 to 200 HV.

[0015] According to an optional embodiment, the main body is a tubular structure that can be movably sleeved on the outside of the inner tube body, and the conductive part is a flange that is perpendicular to the end wall of the main body and extends outward in the circumferential direction.

[0016] According to an optional embodiment, the insulating member has a cylindrical structure, including a first cylindrical body, wherein the first cylindrical body is sleeved outside the inner electrode and is located between the distal end of the inner electrode and the distal end of the outer electrode.

[0017] According to an optional embodiment, an infusion cavity and a pumping cavity are provided in the straight tube section, and the infusion cavity and the pumping cavity extend from the proximal end of the outer tube body to the liquid storage cavity.

[0018] The shock wave angioplasty catheter provided by the present invention has the following technical effects:

[0019] The present invention provides a movable inner electrode and an insulating member between the inner electrode and the outer electrode, and adjusts the discharge gap distance by moving the inner electrode, thereby realizing flexible adjustment of the released shock wave energy.

[0020] In addition, since the distal end of the inner electrode is located outside the distal end of the outer electrode, there is a certain angle between the discharge gap and the axis of the inner tube body. When the position of the inner electrode changes, the direction of the discharge gap also changes accordingly, and the release direction of the shock wave changes, thereby enabling the shock wave to break up the stones at multiple angles, thereby improving the lithotripsy effect, and is suitable for the treatment of severe / completely occluded lesions. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a schematic structural diagram of a shock wave angioplasty catheter in a first embodiment of the present invention;

[0023] Figure 2 It is a schematic cross-sectional view of the shock wave angioplasty catheter in the first embodiment of the present invention along the plane where the axis is located;

[0024] Figure 3 for Figure 2Cross-section view of the AA surface;

[0025] Figure 4 It is a schematic diagram of the structure of the inner electrode in the first embodiment of the present invention;

[0026] Figure 5 It is a schematic structural diagram of an insulating member in the first embodiment of the present invention;

[0027] Figure 6 It is a schematic cross-sectional view of a straight pipe section of an outer pipe in the first embodiment of the present invention along the plane where the axis is located;

[0028] Figure 7 is a schematic structural diagram of an inner electrode in a second embodiment of the present invention;

[0029] Figure 8 It is a schematic cross-sectional view of the shock wave angioplasty catheter along the plane where the axis is located in the second embodiment of the present invention.

[0030] in, Figure 1-Figure 8 :

[0031] 100, shock wave angioplasty catheter; 101, liquid storage cavity; 110, inner tube body; 120, outer tube body; 121, straight tube section; 121a, central cavity; 121b, inner electrode cavity; 121c, first receiving groove; 121d, second receiving groove; 122, cone tube section; 130, electrode assembly; 131, inner electrode; 131a, main body; 131b, conductive part; 132, insulating member; 132a, first cylinder; 132b, second cylinder; 133, outer electrode; 141, liquid filling channel; 142, liquid extraction channel;

[0032] 231, inner electrode; 231a, main body; 231b, conductive part; 232, insulating member. DETAILED DESCRIPTION

[0033] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0034] Based on the defects in the prior art, the following Figure 1-8 The shock wave angioplasty catheter of the present invention will be described in detail.

[0035] like Figure 1-8 As shown, a shock wave angioplasty catheter 100 with controllable shock wave energy and release angle includes an inner tube body 110 , an outer tube body 120 and an electrode assembly 130 .

[0036] The inner tube body 110 extends axially from the proximal end to the distal end and has a guide wire cavity for inserting a guide wire;

[0037] The outer tube body 120 is coaxially sleeved outside the inner tube body 110, and includes a straight tube section 121 and a tapered tube section 122 connected to the distal end of the straight tube section 121. The straight tube section 121 has the same radial dimension along the axial direction, and the radial dimension of the tapered tube section 122 gradually decreases from the proximal end to the distal end, and the distal end is contracted to be sealed and connected with the outer wall of the inner tube body 110, and a liquid storage cavity 101 that can be filled with a liquid medium is formed between the inner wall of the tapered tube section 122 and the outer wall of the inner tube body 110;

[0038] The electrode assembly 130 includes an inner electrode 131, an insulating member 132, and an outer electrode 133 which are sequentially arranged radially outward from the outer wall of the inner tube body 110. The outer electrode 133 is fixedly arranged in the straight tube section 121 of the outer tube body 120, and its distal end extends into the liquid storage cavity 101 of the conical tube section 122; the inner electrode 131 is movably arranged inside the outer electrode 133 from the proximal end of the inner tube body 110, and its distal end passes through the distal end of the outer electrode 133 and extends into the liquid storage cavity 101. The inner electrode 131 It can reciprocate along the extension direction of the outer wall of the inner tube body 110; the insulating member 132 is arranged between the inner electrode 131 and the outer electrode 133 and is elastic along the axial direction, and the distal end of the insulating member 132 contacts / connects with the inner electrode 131, and is used to isolate the inner electrode 131 and the outer electrode 133, so that a discharge gap is formed between the distal end of the inner electrode 131 and the distal end of the outer electrode 133, and the discharge gap is the shortest distance between the conductors of the inner electrode 131 and the outer electrode 133 without shielding;

[0039] When the inner electrode 131 is moved toward the proximal end, the insulating member 132 can be compressed axially toward the proximal end. When the tension applied to the inner electrode 131 is removed, the insulating member 132 can be extended axially toward the distal end, so that the distance of the discharge gap is in the range of 0.01 to 3 mm. When a pulsed high voltage is applied between the electrode assemblies 130, a shock wave is generated between the discharge gaps and can be transmitted to the outside through the liquid medium in the liquid storage chamber 101.

[0040] In this specification, the proximal end refers to the end closer to the operator during the operation, and the distal end refers to the end away from the operator during the operation.

[0041] It should be noted that when the liquid storage chamber 101 is filled with liquid medium, the electrode assembly 130 is connected to a pulsed high-voltage power supply, and pulsed high voltage is applied to the electrode assembly 130. A discharge gap can be formed at the location of the shortest unobstructed distance between the outer electrode 133 and the inner electrode 131. When the discharge gap is in the range of 0.01 to 3 mm, a shock wave can be generated and released at this location. The shock wave propagates outward through the liquid medium and acts on the diseased part close to the wall of the conical tube section 122, thereby having a therapeutic effect on the lesion.

[0042] The magnitude of the shock wave energy released from the discharge gap is usually affected by the following factors: the magnitude of the pulsed high voltage applied to the electrode assembly 130, the spacing of the discharge gap, etc. When the pulsed high voltage value applied to the electrode assembly 130 is kept constant, the magnitude of the released shock wave energy can be flexibly adjusted by adjusting the spacing of the discharge gap. In addition, since the distal end of the inner electrode 131 is located at the distal end of the distal end of the outer electrode 133, there is a certain angle between the discharge gap and the axis of the inner tube body 110. When the position of the inner electrode 131 changes, the inclination angle of the discharge gap relative to the axial direction of the catheter also changes accordingly, thereby causing the release direction of the shock wave to change.

[0043] The present invention configures the inner electrode 131 as an active structure that can reciprocate along the axial direction, and configures an axially retractable insulating member 132 to isolate the inner electrode 131 and the outer electrode 133. The inner electrode 131 is moved to adjust the telescopic length of the insulating member 132, thereby changing the spacing of the internal discharge gap, thereby achieving flexible adjustment of the size of the released shock wave energy and the release angle.

[0044] It should be noted that the present invention forms a liquid storage chamber 101 in the conical tube section 122 of the outer tube body 120 for filling with liquid medium. The discharge gap needs to be formed in the liquid storage chamber 101 . Therefore, the outer electrode 133 can partially extend into the liquid storage chamber 101 .

[0045] In the present invention, the straight tube section 121 and the tapered tube section 122 of the outer tube body 120 can be made of the same material or different materials. The straight tube section 121 and the tapered tube section 122 can be made of at least one material selected from nylon, PTFE, PET, PEEK, PEBAX, and PI; the radial dimension of the straight tube section 121 is 0.8 to 2.0 mm, the wall thickness of the tapered tube section 122 is 0.01 to 0.20 mm, and the taper range of the tapered tube section 122 is 0 to 60 degrees. This solution is conducive to the propagation of shock waves to the outside after release.

[0046] In the present invention, the insulating member 132 is made of at least one material selected from the group consisting of silicone, PI, peek, and nylon. This solution enables the insulating member 132 to have a retractable property, thereby being able to easily adjust the spacing of the discharge gap.

[0047] In the present invention, the structures of the inner electrode 131, the outer electrode 133 and the insulating member 132 can have many different forms. The inner electrode 131 and the outer electrode 133 can be provided with one or more respectively according to the structure. The inner electrode 131 can be a rod-shaped structure or a sleeve structure; the outer electrode 133 can be a sheet-shaped structure or a ring-shaped structure; the insulating member 132 serves to isolate the inner electrode 131 and the outer electrode 133, and its structure and shape are not particularly limited. However, since the edges of the inner electrode 131 and the outer electrode 133 form a discharge gap in the liquid medium, the structure of the insulating member 132 is preferably such that it does not block the straight-line distance between the edges of the inner electrode 131 and the outer electrode 133.

[0048] In a preferred embodiment, the inner electrode 131 is a rod-shaped structure, including a main body 131a extending axially along the inner tube body 110, the radial cross-section of the main body 131a is rectangular or elliptical, with a thickness of 0.05 to 0.2 mm and a width of 0.1 to 0.3 mm; the Vickers hardness is 150 to 200 HV.

[0049] Furthermore, a filling channel 141 and a liquid extraction channel 142 extending from the proximal end of the shock wave angioplasty catheter 100 to the liquid storage chamber 101 are provided in the straight tube section 121 of the outer electrode 133; the liquid medium can be filled into the receiving chamber through the filling channel 141, and the liquid medium in the liquid storage chamber 101 can be extracted in time through the liquid extraction channel 142.

[0050] refer to Figures 1 to 3 The first embodiment of the present invention provides a shock wave angioplasty catheter 100, comprising:

[0051] The inner tube body 110 extends axially from the proximal end to the distal end and has a guide wire lumen for inserting the guide wire 200;

[0052] The outer tube body 120 is coaxially sleeved on the outside of the inner tube body 110, and includes a straight tube section 121 and a tapered tube section 122 connected to the distal end of the straight tube section 121. The straight tube section 121 has the same radial dimension along the axial direction, and the radial dimension of the tapered tube section 122 gradually decreases from the proximal end to the distal end, and the distal end of the tapered tube section 122 shrinks to be sealed and connected to the tube wall of the inner tube body 110, and a liquid storage chamber 101 that can be filled with liquid medium is formed between the inner wall of the tapered tube section 122 and the outer wall of the inner tube body 110.

[0053] The electrode assembly 130 includes an inner electrode 131, an insulating member 132 and an outer electrode 133 which are sequentially arranged from the outer wall of the inner tube body 110 along the circumferential direction outward, the outer electrode 133 is fixedly arranged in the straight tube section 121, and its distal end extends into the receiving cavity; the inner electrode 131 is movably arranged on the inner side of the outer electrode 133 from the proximal end of the inner tube body 110 and can reciprocate along the extension direction of the inner tube body 110, and its distal end passes through the outside of the outer electrode 133 and extends into the receiving cavity; the insulating member 132 is arranged between the inner electrode 131 and the outer electrode 133, and its distal end contacts the inner electrode 131, and the insulating member 132 is retractable along the axial direction and is used to isolate the inner electrode 131 and the outer electrode 133, so that a discharge gap is formed between the distal end of the inner electrode 131 and the distal end of the outer electrode 133, wherein the discharge gap refers to the position where the shortest distance between the conductors of the inner electrode 131 and the outer electrode 133 is located.

[0054] When the inner electrode 131 is moved toward the proximal end, the insulating member 132 can be compressed axially toward the proximal end; when the tension applied to the inner electrode 131 is removed, the insulating member 132 can be extended axially toward the distal end, so that the distance of the discharge gap is in the range of 0.01 to 3 mm. When the liquid storage chamber 101 is filled with liquid medium and a pulsed high voltage is applied to the electrode assembly 130, a shock wave is generated between the discharge gaps and can be transmitted outward through the liquid medium.

[0055] In this embodiment, the straight tube section 121 of the outer tube body 120 is made of nylon and has a radial dimension of 0.8 mm. The tapered tube section 122 is made of PTFE and has a wall thickness of 0.01 mm. The tapered angle of the side wall of the tapered tube section 122 is 15 degrees.

[0056] In this embodiment, the insulating member 132 is made of silicone.

[0057] In this embodiment, the outer electrode 133 has an annular structure and is disposed in the straight tube section 121 of the outer tube body 120 . The distal end wall of the outer electrode 133 is located in the liquid storage cavity 101 .

[0058] refer to Figure 4 The inner electrode 131 has an L-shaped rod-shaped structure, including a main body 131a and a conductive portion 131b. The main body 131a is a rod-shaped structure extending axially, and the conductive portion 131b is vertically connected to the distal end of the main body 131a. When the main body 131a is arranged on the outside of the inner tube body 110, the conductive portion 131b extends radially outward along the inner tube body 110, and the length of the conductive portion 131b is less than the inner diameter of the outer electrode 133.

[0059] In this embodiment, there are two inner electrodes 131 , which are symmetrically arranged on the outer wall of the inner tube body 110 along the axis.

[0060] refer to Figure 5The insulating member 132 has a cylindrical structure, including a first cylinder 132a and a second cylinder 132b connected to the proximal end of the first cylinder 132a, the first cylinder 132a is located between the distal end of the outer electrode 133 and the distal end of the inner electrode 131, and the second cylinder 132b is located inside the outer electrode 133; the radial dimension of the first cylinder 132a is smaller than the radial dimension of the second cylinder 132b, and is slightly smaller than the length of the conductive portion 131b of the inner electrode 131. This solution can form a stable discharge gap between the edge of the conductive portion 131b of the inner electrode 131 and the distal end of the outer electrode 133 without being blocked by the insulating member 132.

[0061] In this embodiment, reference Figure 3 , Figure 6 The straight tube section 121 of the outer tube body 120 has a central cavity 121a passing through the axis, and the central cavity 121a is used to penetrate the inner tube body 110; two inner electrode 131 cavities 121b are also provided in the straight tube section 121, and the two inner electrode 131 cavities 121b are used to penetrate the two inner electrodes 131 respectively.

[0062] In the present invention, the cavities 121b of the two inner electrodes 131 may be connected to the central cavity 121a in the radial direction or may not be connected. In this embodiment, the cavities 121b of the two inner electrodes 131 and the central cavity 121a are connected in the radial direction.

[0063] A first receiving groove 121c and a second receiving groove 121d with openings on the distal end wall are also provided in the straight pipe section 121, wherein the structure of the first receiving groove 121c is adapted to the structure of the outer electrode 133 and is used to accommodate the outer electrode 133; the structure of the second receiving groove 121d is adapted to the structure of the second cylinder 132b of the insulating member 132 and is used to accommodate the second cylinder 132b.

[0064] In this embodiment, the insulating member 132 is relatively fixed by the proximal end of the second cylinder 132b abutting against the end wall of the second receiving groove 121d and the distal end of the first cylinder 132a abutting against the conductive portion 131b of the inner electrode 131.

[0065] A liquid filling channel 141 and a liquid extraction channel 142 extending from the proximal end to the liquid storage chamber 101 are also provided in the tube wall of the straight tube section 121. The liquid storage chamber 101 can be filled with liquid medium through the liquid filling channel 141, and the liquid medium in the liquid storage chamber 101 can be promptly extracted through the liquid extraction channel 142. Since electrode fragments will be generated when the electrode assembly 130 discharges in the liquid medium, the liquid medium in the liquid storage chamber 101 can be promptly replaced through the liquid filling channel 141 and the liquid extraction channel 142, thereby avoiding excessive impurities affecting the shock wave release effect.

[0066] refer to Figure 7 , Figure 8The second embodiment of the present invention provides another shock wave angioplasty catheter 100, which is different from the first embodiment in that, in this embodiment, the main body 231a of the inner electrode 231 has a tubular structure and can be movably mounted on the outside of the inner tube body 110, and the conductive portion 231b is a flange structure that is perpendicular to the end wall of the main body 231a and extends outward in the circumferential direction; the insulating member 232 has a cylindrical structure, and its proximal end abuts against the distal end wall of the straight tube section 121 of the outer tube body 120, and the distal end abuts against the conductive portion 231b of the inner electrode 231.

[0067] In the description of the present invention, it should be noted that, unless otherwise specified, "multiple" means two or more than two; the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0068] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0069] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A shock wave angioplasty catheter, characterized in that: The invention comprises an inner tube body, an outer tube body and an electrode assembly arranged between the inner tube body and the outer tube body, wherein the outer tube body is sleeved on the inner tube body and comprises a straight tube section and a tapered tube section connected to the distal end of the straight tube section, wherein the radial dimension of the tapered tube section gradually decreases from the proximal end to the distal end, and the distal end of the tapered tube section shrinks to be sealed and connected to the outer wall of the inner tube body, thereby forming a liquid storage cavity that can be filled with a liquid medium; An electrode assembly, comprising an inner electrode, an insulating member and an outer electrode which are sequentially arranged radially outward from the outer wall of the inner tube body, wherein the outer electrode is fixedly arranged in the straight tube section, and the distal end of the outer electrode extends into the liquid storage cavity; the inner electrode is movably arranged inside the outer electrode from the proximal end of the inner tube body, the distal end of the inner electrode passes through the outside of the outer electrode and extends into the liquid storage cavity, and the inner electrode can reciprocate along the extension direction of the inner tube body; the insulating member is arranged between the inner electrode and the outer electrode and has elasticity in the axial direction, the distal end of the insulating member is in contact with the inner electrode and is used to isolate the inner electrode and the outer electrode, so that a discharge gap is formed between the distal end of the inner electrode and the distal end of the outer electrode, and the discharge gap is the shortest distance between the conductors on the inner electrode and the outer electrode; When the inner electrode is moved toward the proximal end, the insulating member can be compressed axially toward the proximal end. When the tension applied to the inner electrode is removed, the insulating member can be extended axially toward the distal end, so that the distance of the discharge gap is in the range of 0.01 to 3 mm. When a pulsed high voltage is applied between the electrode assemblies, a shock wave is generated between the discharge gaps and can be transmitted outward through the liquid medium in the liquid storage chamber.

2. The shock wave angioplasty catheter according to claim 1, characterized in that The insulating member is made of at least one of silicone, PI, peek and nylon.

3. The shock wave angioplasty catheter according to claim 1, characterized in that The tapered tube section of the outer tube body is made of at least one material selected from nylon, PTFE, PET, PEEK, PEBAX, and PI, and the tube wall thickness of the tapered tube section is 0.01 to 0.20 mm.

4. The shock wave angioplasty catheter according to claim 1, characterized in that The radial dimension of the straight tube section of the outer tube body is 0.8 to 2.0 mm, and the taper range of the tapered tube section is 15 to 60 degrees.

5. The shock wave angioplasty catheter according to claim 1, characterized in that The inner electrode includes a main body and a conductive part, wherein the main body extends axially along the inner tube body, the conductive part is vertically connected to the distal end of the main body and extends radially outward along the inner tube body, the conductive part abuts against the distal end wall of the insulating member, and a discharge gap is formed between the end of the conductive part and the distal end of the outer electrode.

6. The shock wave angioplasty catheter according to claim 5, characterized in that The inner electrode has an L-shaped rod-shaped structure, the main body and the conductive part are both slender rod-shaped structures, and there are multiple inner electrodes, which are evenly arranged on the outer side of the inner tube body along the circumferential direction.

7. The shock wave angioplasty catheter according to claim 5, characterized in that The radial cross section of the main body of the inner electrode is rectangular or elliptical, with a thickness of 0.05 to 0.2 mm and a width of 0.1 to 0.3 mm; and a Vickers hardness of 150 to 200 HV.

8. The shock wave angioplasty catheter according to claim 5, characterized in that The main body is a tubular structure that can be movably sleeved outside the inner tube body, and the conductive part is a flange that is perpendicular to the end wall of the main body and extends outward along the circumferential direction.

9. The shock wave angioplasty catheter according to claim 1, characterized in that The insulating member has a cylindrical structure, and comprises a first cylindrical body, wherein the first cylindrical body is sleeved outside the inner electrode and is located between the distal end of the inner electrode and the distal end of the outer electrode.

10. The shock wave angioplasty catheter according to claim 1, characterized in that An infusion cavity and a liquid extraction cavity are arranged in the straight tube section, and the infusion cavity and the liquid extraction cavity extend from the proximal end of the outer tube body to the liquid storage cavity.

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