Shockwave plasty catheter

Abstract

The utility model 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 taper 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 utility model, the movable inner electrode is arranged, the insulating part is arranged between the inner electrode and the outer electrode, and the inner electrode is moved to realize the adjustment of the discharge gap distance, so that the flexible adjustment of the energy of the released shock wave can be realized. 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 utility model relates to medical instrument technical field especially is related to a shock wave forming technique catheter. BACKGROUND

[0002] Vascular angioplasty balloon is often used to open calcified lesions in the blood vessel wall and restore normal blood flow in the blood vessel, with the development of liquid-electric lithotripsy technology in recent years, shock wave forming technique catheter is gradually applied to the blood vessel system for treating calcified lesions in the blood vessel. Shock wave forming technique catheter is provided with one or more electrode assemblies in the vascular angioplasty catheter, when the catheter is implanted close to the lesion position, liquid medium is filled in the catheter to make it contact the lesion part, pulse driving current is provided to the electrode assembly, and the shock wave energy can be released outward in the form of full circumference and intermittence, the shock wave energy is propagated outward through the liquid medium in the catheter and impacts the calcified lesion area, so that the internal displacement of the calcified lesion area even cracks, the compliance of the blood vessel is recovered, the lithotripsy effect is achieved, and the treatment effect of the vascular balloon angioplasty or stent implantation is more obvious.

[0003] Therefore, the prior art discloses a low profile design shock wave forming technique catheter structure, so that the shock wave forming technique 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 are usually fixed in the prior art, the size and angle of the shock wave energy cannot be flexibly adjusted, thereby affecting the lithotripsy effect, and it is difficult to be applied to the treatment of severe / complete occlusion lesions. UTILITY MODEL CONTENTS

[0005] Therefore, the utility model aims at providing a shock wave forming technique catheter to solve the technical problem that the discharge position and discharge gap of the electrode pair in the shock wave forming technique catheter in the prior art are usually fixed, so that it is difficult to be applied to the treatment of severe / complete occlusion lesions.

[0006] In order to achieve the above-mentioned purpose, the utility model provides a shock wave forming technique catheter, which comprises an inner tube body, an outer tube body and an electrode assembly arranged between the inner tube body and the outer tube body, the outer tube body is sleeved on the inner tube body, comprises a straight pipe section and a taper pipe section connected at the distal end of the straight pipe section, the radial dimension of the taper pipe section gradually decreases from the proximal end to the distal end, and the distal end of the taper pipe section is contracted to be sealingly connected with the outer wall of the inner tube body, forming a liquid storage cavity that can be filled with liquid medium.

[0007] The electrode assembly comprises an inner electrode, an insulating member and an outer electrode arranged in sequence from the outer wall of the inner tube body radially outward, the outer electrode is fixedly arranged in the straight tube segment, 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 extends out of the outer electrode and 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 axial elasticity, the distal end of the insulating member is in abutting connection with the inner electrode for isolating the inner electrode and the outer electrode, so as to form a discharge gap 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 proximally, the insulating member can be compressed axially proximally, when the pulling force applied to the inner electrode is removed, the insulating member can be elongated axially distally, so that the distance of the discharge gap is in the range of 0.01 to 3 mm, and when pulse high voltage is applied between the electrode assemblies, the shock wave generated between the discharge gaps can be transmitted outward through the liquid medium in the liquid storage cavity.

[0009] According to an optional embodiment, the insulating member is made of at least one of silica gel, PI, peek, nylon.

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

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

[0012] According to an optional embodiment, the inner electrode comprises a main body portion and a conductive portion, the main body portion extends axially along the inner tube body, the conductive portion is connected perpendicularly to the distal end of the main body portion and extends radially outward along the inner tube body, the conductive portion abuts on the distal end wall of the insulating member, and the distal end of the conductive portion forms a discharge gap with the distal end of the outer electrode.

[0013] According to an optional embodiment, the inner electrode has an L-shaped rod structure, the main body portion and the conductive portion are both slender rod structures, and the inner electrode has a plurality of portions arranged uniformly in the circumferential direction on the outside of the inner tube body.

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

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

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

[0017] According to an optional embodiment, the straight tube section is provided with a liquid infusion cavity and a liquid extraction cavity, and the liquid infusion cavity and the liquid extraction cavity extend from the proximal end of the outer tube to the liquid storage cavity.

[0018] The shock wave forming catheter provided by the utility model has the following technical effects:

[0019] The utility model discloses a movable inner electrode is set, and the insulating part is set between the inner electrode and the outer electrode, and the discharge gap spacing is adjusted by moving the inner electrode, and then the flexible adjustment of the released shock wave energy size can be realized.

[0020] In addition, since the distal end of the inner electrode is located outside the distal end of the outer electrode, the discharge gap has a certain angle with the axis of the inner tube, when the position of the inner electrode changes, the direction of the discharge gap also changes accordingly, the release direction of the shock wave changes, and then the shock wave multi-angle lithotripsy is realized, the lithotripsy effect is improved, and the treatment of serious / complete occlusion lesions is suitable. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to these drawings without creating creative labor.

[0022] Figure 1 It is the structure schematic view of the shock wave forming catheter in the first embodiment of the utility model;

[0023] Figure 2 It is the cross section schematic view of the shock wave forming catheter through the plane where the axis is located in the first embodiment of the utility model;

[0024] Figure 3 It isFigure 2 A-A plane;

[0025] Figure 4 is a structural schematic view of the inner electrode in the first embodiment of the utility model;

[0026] Figure 5 is a structural schematic view of the insulation part in the first embodiment of the utility model;

[0027] Figure 6 is a sectional view of the straight pipe section of the outer pipe in the first embodiment of the utility model along the plane where the axis is located;

[0028] Figure 7 is a structural schematic view of the inner electrode in the second embodiment of the utility model;

[0029] Figure 8 is a sectional view of the shock wave angioplasty catheter in the second embodiment of the utility model along the plane where the axis is located.

[0030] Wherein, Figures 1-8 :

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

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

[0033] In order to make the purpose, technical scheme and advantages of the utility model more clear, the technical scheme of the utility model will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope protected by the utility model.

[0034] Based on the defects existing in the prior art, the specific drawings of the utility model will be combined below Figures 1-8 The shock wave angioplasty catheter 100 of the utility model will be described in detail.

[0035] As Figures 1-8As shown, the shock wave energy and release angle controllable shock wave forming catheter 100 comprises 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 lumen for threading a guide wire;

[0037] The outer tube body 120 is coaxially sleeved outside the inner tube body 110 and comprises 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 in the axial direction. The radial dimension of the tapered tube section 122 gradually decreases from the proximal end to the distal end, and the distal end is shrunk to be sealingly connected to the outer wall of the inner tube body 110. The inner wall of the tapered tube section 122 and the outer wall of the inner tube body 110 form a liquid medium storage cavity 101 that can be filled with liquid medium;

[0038] The electrode assembly 130 comprises an inner electrode 131, an insulating member 132 and an outer electrode 133 arranged in the outer wall of the inner tube body 110 in the radial direction in sequence. The outer electrode 133 is fixedly arranged in the straight tube section 121 of the outer tube body 120, and the distal end extends into the liquid medium storage cavity 101 of the tapered 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 the distal end extends out of the distal end of the outer electrode 133 and into the liquid medium storage cavity 101. The inner electrode 131 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 has axial elasticity. The distal end of the insulating member 132 abuts / connect with the inner electrode 131, so as to isolate the inner electrode 131 and the outer electrode 133, and form a discharge gap between the distal end of the inner electrode 131 and the distal end of the outer electrode 133. The discharge gap is the position where the shortest distance between the conductors of the inner electrode 131 and the outer electrode 133 is located;

[0039] When the inner electrode 131 is moved towards the proximal end, the insulating member 132 is compressed axially. When the pulling force applied to the inner electrode 131 is removed, the insulating member 132 is elongated axially, 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 assembly 130, an impact wave is generated between the discharge gap, which can be transmitted outward through the liquid medium in the liquid medium storage cavity 101.

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

[0041] It should be noted that when the liquid medium is filled in the liquid storage cavity 101, the electrode assembly 130 is connected to the pulse high-voltage power supply, and the pulse high-voltage is applied to the electrode assembly 130, and the position where the shortest distance between the outer electrode 133 and the inner electrode 131 without shielding can form a discharge gap, and when the discharge gap is in the range of 0.01 to 3 millimeters, the shock wave can be generated and released at the position, and the shock wave is transmitted outward through the liquid medium and acts on the lesion part close to the pipe wall of the conical pipe section 122, so that the lesion can be treated.

[0042] The size of the shock wave energy released from the discharge gap is generally affected by the following factors: the pulse high-voltage applied to the electrode assembly 130, the spacing of the discharge gap, etc. In the case where the pulse high-voltage value applied to the electrode assembly 130 is maintained constant, the size 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, the discharge gap has a certain angle with the axis of the inner tube body 110, and the position of the inner electrode 131 changes, the inclination angle of the discharge gap relative to the catheter axis also changes accordingly, thereby causing the release direction of the shock wave to change.

[0043] The utility model discloses the inner electrode 131 is set to the reciprocating movable activity structure along the axial direction, and sets up the insulation piece 132 of retractable along the axial direction and separates the inner electrode 131 and the outer electrode 133, and the retractable length of insulation piece 132 is adjusted by moving the inner electrode 131, realizes the change of inner discharge gap spacing, and then realizes the flexible adjustment of the size and release angle of the released shock wave energy.

[0044] It should be noted that the utility model forms a liquid storage cavity 101 in the conical pipe section 122 of the outer tube body 120 for filling liquid medium, and the discharge gap needs to be formed in the liquid storage cavity 101, therefore, the outer electrode 133 can extend partially into the liquid storage cavity 101.

[0045] In the utility model, the straight pipe section 121 and the conical pipe section 122 of the outer tube body 120 can be made of the same material or different materials. The straight pipe section 121 and the conical pipe section 122 can be made of at least one of nylon, PTFE, PET, PEEK, PEBAX and PI. The radial dimension of the straight pipe section 121 is 0.8 to 2.0 mm, the thickness of the pipe wall of the conical pipe section 122 is 0.01 to 0.20 mm, and the taper range of the conical pipe section 122 is 0 to 60 degrees. The scheme is conducive to the outward propagation of the released shock wave.

[0046] The insulating piece 132 is made of at least one of silica gel, PI, peek and nylon.

[0047] In the utility model, the structure of the inner electrode 131, the outer electrode 133 and the insulating piece 132 can have multiple different forms, the inner electrode 131 and the outer electrode 133 can be respectively provided with one or multiple according to the structure, the inner electrode 131 can be a rod structure or a sleeve structure; the outer electrode 133 can be a sheet structure or a ring structure; the insulating piece 132 is used for isolating the inner electrode 131 and the outer electrode 133, and the structure and shape of the insulating piece 132 are not specially limited, but since the edges of the inner electrode 131 and the outer electrode 133 form a discharge gap in the liquid medium, therefore, the structure of the insulating piece 132 is preferably not to block the straight line distance between the edges of the inner electrode 131 and the outer electrode 133.

[0048] In the preferred embodiment, the inner electrode 131 is a rod structure, including a main body part 131a extending along the inner tube body 110 in the axial direction, the radial section of the main body part 131a is a rectangle or an ellipse, the thickness is 0.05 to 0.2 mm, and the width is 0.1 to 0.3 mm; the Vickers hardness is 150 to 200 HV.

[0049] Further, the straight pipe section 121 of the outer electrode 133 is provided with a liquid filling channel 141 and a liquid pumping channel 142 extending from the proximal end of the shock wave angioplasty catheter 100 to the liquid storage cavity 101; the liquid filling channel 141 can be used to fill the liquid medium into the storage cavity, and the liquid pumping channel 142 can be used to pump out the liquid medium in the liquid storage cavity 101 in time.

[0050] Reference Figures 1 to 3 The utility model discloses a shock wave angioplasty catheter 100, including:

[0051] The inner tube body 110 extends from the proximal end to the distal end in the axial direction and has a guide wire cavity for passing a 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 pipe section 121 and a tapered pipe section 122 connected to the distal end of the straight pipe section 121, the straight pipe section 121 has the same radial size in the axial direction, the radial size of the tapered pipe section 122 gradually decreases from the proximal end to the distal end, and the distal end of the tapered pipe section 122 is contracted to be sealingly connected with the tube wall of the inner tube body 110, and the inner wall of the tapered pipe section 122 and the outer wall of the inner tube body 110 form a liquid medium storage cavity 101 that can be filled with liquid medium.

[0053] The electrode assembly 130 comprises an inner electrode 131, an insulating member 132 and an outer electrode 133 arranged in sequence from the outer wall of the inner tube body 110 outward in the circumferential direction, the outer electrode 133 is fixedly arranged in the straight tube section 121, and the distal end thereof extends into the accommodating cavity; the inner electrode 131 is movably arranged inside 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, the distal end thereof penetrates out of the outer electrode 133 and extends into the accommodating cavity; the insulating member 132 is arranged between the inner electrode 131 and the outer electrode 133, the distal end thereof abuts against the inner electrode 131, the insulating member 132 has axial elasticity, and is used for isolating the inner electrode 131 and the outer electrode 133 to form a discharge gap between the distal ends of the inner electrode 131 and the outer electrode 133, wherein the discharge gap refers to the position of the shortest distance between the conductors of the inner electrode 131 and the outer electrode 133.

[0054] When the inner electrode 131 is moved proximally, the insulating member 132 can be compressed axially proximally; when the pulling force applied to the inner electrode 131 is removed, the insulating member 132 can be elongated axially distally, so that the distance of the discharge gap is within the range of 0.01 to 3 mm; when the liquid medium is filled in the liquid storage cavity 101 and the pulse high voltage is applied to the electrode assembly 130, the shock wave generated between the discharge gap can be transmitted outward through the liquid medium.

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

[0056] In the embodiment, the insulating member 132 is made of silica gel.

[0057] In the embodiment, the outer electrode 133 has a ring structure, is arranged in the straight tube section 121 of the outer tube body 120, and the distal end wall of the outer electrode 133 is located in the liquid storage cavity 101.

[0058] Reference Figure 4 The inner electrode 131 has an L-shaped rod structure, comprising a main body part 131a and a conductive part 131b, the main body part 131a is a rod structure extending in the axial direction, the conductive part 131b is connected to the distal section of the main body part 131a perpendicularly, when the main body part 131a is arranged outside the inner tube body 110, the conductive part 131b extends radially outward along the inner tube body 110, and the length of the conductive part 131b is less than the inner diameter of the outer electrode 133.

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

[0060] Reference Figure 5The insulating piece 132 has a cylindrical structure, comprising 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 slightly smaller than the length of the conductive part 131b of the inner electrode 131. The scheme can form a stable discharge gap between the edge of the conductive part 131b of the inner electrode 131 and the distal end of the outer electrode 133, and will not be blocked by the insulating piece 132.

[0061] In the embodiment, the outer electrode 133 is a hollow cylinder, and the inner electrode 131 is a hollow cylinder. Figure 3 、 Figure 6 The straight pipe section 121 of the outer pipe body 120 has a central cavity 121a passing through the axis, and the central cavity 121a is used for penetrating the inner pipe body 110; two inner electrode 131 cavities 121b are further arranged in the straight pipe section 121, and the two inner electrode 131 cavities 121b are used for penetrating the two inner electrodes 131 respectively.

[0062] In the utility model, the two inner electrode 131 cavities 121b and the central cavity 121a can be communicated or not communicated along the radial direction, and in the embodiment, the two inner electrode 131 cavities 121b and the central cavity 121a are communicated along the radial direction.

[0063] The straight pipe section 121 further comprises a first receiving groove 121c and a second receiving groove 121d, and the first receiving groove 121c is arranged on the distal end wall; the structure of the first receiving groove 121c is matched with the structure of the outer electrode 133, and the first receiving groove 121c is used for receiving the outer electrode 133; the structure of the second receiving groove 121d is matched with the structure of the second cylinder 132b of the insulating piece 132, and the second receiving groove 121d is used for receiving the second cylinder 132b.

[0064] In the embodiment, the insulating piece 132 is abutted on the end wall of the second receiving groove 121d through the proximal end of the second cylinder 132b, and the insulating piece 132 is abutted on the conductive part 131b of the inner electrode 131 through the distal end of the first cylinder 132a, so that the relative fixation of the insulating piece 132 is realized.

[0065] The pipe wall of the straight pipe section 121 further comprises a liquid filling channel 141 and a liquid pumping channel 142, which extend from the proximal end to the liquid storage cavity 101. The liquid medium can be filled into the liquid storage cavity 101 through the liquid filling channel 141, and the liquid medium in the liquid storage cavity 101 can be pumped out in time through the liquid pumping channel 142. Since electrode fragments are generated when the electrode assembly 130 discharges in the liquid medium, the liquid medium in the liquid storage cavity 101 can be replaced in time through the liquid filling channel 141 and the liquid pumping channel 142, so that the impact wave release effect is not affected by too much impurity.

[0066] In the embodiment, the outer electrode 133 is a hollow cylinder, and the inner electrode 131 is a hollow cylinder. Figure 7 、 Figure 8The utility model discloses a second embodiment provides another shock wave forming technique catheter 100, with the difference of first embodiment, in this embodiment, the main part 231a of inner electrode 231 has tubular structure, and the movable sleeve is set in the outside of inner tube body 110, and the conducting part 231b is the end wall that is perpendicular to main part 231a, and the flange structure that extends outward along the circumference, the insulating part 232 has the tubular structure, and its proximal end is in contact on the outer tube body 120 straight pipe section 121 far end end wall, and the distal end is in contact on the conducting part 231b of inner electrode 231.

[0067] In the description of the utility model, it needs to be explained that, unless otherwise stated, the meaning of "multiple" is two or more than two;The orientation or position relation indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like is based on the orientation or position relation shown in the drawing, and is only for the convenience of describing the utility model and simplifying the description, and is not indicative or implied that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore can not be understood as limiting the utility model. In addition, the terms "first", "second", "third" and the like are only for the purpose of description, and can not be understood as indicative or implied relative importance.

[0068] In the description of the utility model, it also needs to be explained that, unless otherwise stated and limited, the terms "mounting", "connection", "connection" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected;It can be mechanically connected, or it can be electrically connected;It can be directly connected, or it can be indirectly connected through an intermediate medium. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0069] The above is only a specific embodiment of the utility model, but the protection scope of the utility model is not limited to this, any skilled in the art can easily think of changes or replacements within the technical range disclosed by the utility model, which should be covered in the protection scope of the utility model. Therefore, the protection scope of the utility model should be subject to the protection scope of the claims.

Claims

1. A Shockwave Shaping catheter, characterized in that, The electrode assembly comprises an inner electrode, an insulating member and an outer electrode arranged in sequence from the outer wall of the inner tube radially outward, 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, the distal end of the inner electrode extends out of the outer electrode and into the liquid storage cavity, and the inner electrode can reciprocate along the extension direction of the inner tube; the insulating member is arranged between the inner electrode and the outer electrode and has axial elasticity, the distal end of the insulating member is in abutting connection with the inner electrode, for isolating the inner electrode and the outer electrode, forming a discharge gap 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 proximally, the insulating member can be compressed axially proximally, when the pulling force applied to the inner electrode is removed, the insulating member can be elongated axially distally, so that the distance of the discharge gap is in the range of 0.01 to 3 mm, and when pulse high voltage is applied to the electrode assembly, the shock wave generated between the discharge gap can be transmitted outward through the liquid medium in the liquid storage cavity. The insulating member is made of one of silicone, PI, peek and nylon.

2. The Shockwave forming catheter of claim 1, wherein, The taper tube section of the outer tube is made of one of nylon, PTFE, PET, PEEK, PEBAX and PI, and the wall thickness of the taper tube section is 0.01 to 0.20 mm.

3. The Shockwave forming catheter of claim 1, wherein, The radial dimension of the straight tube section of the outer tube is 0.8 to 2.0 mm, and the taper range of the taper tube section is 15 to 60 degrees.

4. The Shockwave forming catheter of claim 1, wherein, The inner electrode comprises a main body and a conductive part, the main body extends axially along the inner tube, the conductive part is perpendicularly connected to the distal end of the main body and extends radially outward along the inner tube, the conductive part abuts on the distal end wall of the insulating member, and the discharge gap is formed between the distal end of the conductive part and the distal end of the outer electrode.

5. The Shockwave molding catheter of claim 1, wherein, The inner electrode has an L-shaped rod structure, the main body and the conductive part are both slender rod structures, and the inner electrode has a plurality of parts arranged uniformly in the circumferential direction on the outside of the inner tube.

6. The Shockwave forming catheter of claim 5, wherein, The radial cross section of the main body of the inner electrode is rectangular or elliptical, the thickness is 0.05 to 0.2 mm, the width is 0.1 to 0.3 mm, and the Vickers hardness is 150 to 200 HV.

7. The Shockwave forming catheter of claim 5, wherein, The main body is a tubular structure movably sleeved on the outside of the inner tube, and the conductive part is a flange perpendicularly extending outward from the end wall of the main body.

8. The Shockwave molding catheter of claim 5, wherein, ​ 9. The Shockwave molding catheter of claim 1, wherein, The insulating piece has a cylindrical structure, comprising a first cylinder body, which is sleeved outside the inner electrode and located between the distal end of the inner electrode and the distal end of the outer electrode.

10. The Shockwave molding catheter of claim 1, wherein, The straight pipe section is provided with a liquid delivery cavity and a liquid suction cavity, and the liquid delivery cavity and the liquid suction cavity extend from the proximal end of the outer pipe body to the liquid storage cavity.

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