Shock wave balloon catheter

Abstract

The invention relates to a shock wave balloon catheter which comprises a balloon catheter body, the balloon catheter body is provided with a balloon body capable of being filled with fluid, the far end of the balloon catheter body is provided with an elastic end composed of a spiral spring, and the balloon catheter body is provided with a developing mark; the electrode assembly is located in the balloon body and used for discharging the fluid and driving the elastic end to move correspondingly; the multi-section plug is provided with a plurality of conducting areas which are isolated from one another in a circuit mode in the insertion direction, and the conducting areas are connected with the electrode assembly through wires; and the host is provided with a jack matched with the multi-section plug and is used for supplying power to the electrode assembly. When the balloon body is pressurized and filled, the main machine supplies power to the electrode assembly through the conducting area of the multi-section plug, the electrode assembly is discharged through the wire to break down liquid, the liquid is rapidly vaporized and expanded, shock waves are triggered, the elastic end is pushed to penetrate forwards, and the elastic end can penetrate through the chronic occlusion lesion in the blood vessel easily. The multi-section plug is adopted, and convenience and reliability of connection to a host are improved.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and in particular to a shock wave balloon catheter. Background Art

[0002] At present, the common methods for treating calcified lesions or other obstructions in blood vessels, such as coronary artery calcification or atherosclerosis, include balloon dilatation and stent implantation. These methods have the same disadvantages, which are that they can easily cause damage to the vascular endothelium and endothelial hyperplasia by physically dilating the narrowed channel of the blood vessel, leading to the risk of restenosis of the blood vessel.

[0003] The shock wave balloon dilatation catheter integrates a shock wave generator that can treat calcified or hardened plaques by generating shock wave energy inside the balloon, providing an additional mechanical fragmentation effect. Traditional balloon dilatation catheters have good dilatation effects on mild to moderate stenosis and soft plaques, but have limited effects on severely calcified plaques. The shock wave balloon dilatation catheter can effectively treat hardened and calcified plaques, providing more durable and thorough vascular dilation through shock wave fragmentation technology. Summary of the invention

[0004] Based on this, it is necessary to provide a shock wave balloon catheter to address the above technical problems.

[0005] The shock wave balloon catheter of the present application comprises:

[0006] A balloon catheter, comprising a balloon body that can be filled with fluid, wherein the distal end of the balloon catheter is provided with an elastic end head formed by a coil spring, and the balloon catheter is provided with a developing mark;

[0007] An electrode assembly, located in the balloon body, for discharging the fluid and driving the elastic end to move accordingly;

[0008] A multi-section plug having a plurality of conductive areas that are isolated from each other in circuits along the insertion direction, each of the conductive areas being connected to the electrode assembly via a wire;

[0009] The host is provided with a socket matched with the multi-section plug and is used to supply power to the electrode assembly.

[0010] Several optional methods are also provided below, but they are not intended to be additional limitations on the above-mentioned overall solution, but are merely further supplements or preferences. Under the premise that there are no technical or logical contradictions, each optional method can be combined with the above-mentioned overall solution separately, and multiple optional methods can also be combined.

[0011] Optionally, the diameter of the elastic end has an overall decreasing trend from the proximal end to the distal end.

[0012] Optionally, the elastic end includes a tightly wound section at the distal end and a loosely wound section at the proximal end.

[0013] Optionally, the winding pitch of the tightly wound section is 0.01-0.1 mm, and the winding pitch of the loosely wound section is 0.1-0.5 mm.

[0014] Optionally, the axial length of the tightly wound section is 1 to 5 mm, and the axial length of the loosely wound section is 1 to 5 mm.

[0015] Optionally, the diameter of the tightly wound section is 0.30 mm to 0.60 mm, and the diameter of the loosely wound section is 0.60 to 0.80 mm.

[0016] Optionally, the wire diameter of the elastic end is 0.05-0.1 mm, and the compression stroke of the elastic end is 0.1-0.5 mm.

[0017] Optionally, the electrode assembly has a plurality of discharge locations, and different discharge locations are arranged radially opposite to each other and discharge simultaneously.

[0018] Optionally, the balloon catheter comprises:

[0019] The inner tube has a guide wire channel inside, the elastic end is connected to the distal end of the inner tube, and the electrode assembly is installed on the outer wall of the inner tube;

[0020] An outer tube is located outside the inner tube, and a radial gap between the inner tube and the outer tube is a fluid channel;

[0021] A balloon body, which is located at the outer periphery of the inner tube and is sealed and connected to the distal end of the outer tube, and the interior of the balloon body is communicated with the fluid channel;

[0022] The interface is connected to the proximal end of the outer tube and is used for supplying fluid through the fluid channel and for allowing the guide wire to extend into the balloon catheter.

[0023] Optionally, the inner tube extends proximally to the interface component and the proximal end of the guidewire channel opens to the interface component; or

[0024] The proximal end of the inner tube is butted against the tube wall of the outer tube, and the proximal end of the guide wire channel is open to the tube wall of the outer tube.

[0025] Optionally, the electrode assembly includes:

[0026] A liner installed on the outer surface of the inner tube;

[0027] An electrode ring is installed on the outer surface of the liner, including a first electrode ring and a second electrode ring arranged along the axial direction, and each electrode ring has two discharge holes;

[0028] A transition line coupled to different electrode rings through the discharge holes;

[0029] The wire comprises:

[0030] A first conductive wire is coupled to the first electrode ring and a conductive area corresponding to the multi-section plug through the discharge hole;

[0031] The second conducting wire is coupled to the second electrode ring and a conductive area corresponding to the multi-section plug through the discharge hole.

[0032] Optionally, each of the electrode rings includes a first discharge hole and a second discharge hole;

[0033] The transition line is coupled between the second discharge hole of the first electrode ring and the first discharge hole of the second electrode ring;

[0034] The first wire is coupled to the second discharge hole of the first electrode ring;

[0035] The second conducting wire is coupled to the first discharge hole of the second resistance ring.

[0036] Optionally, the first wire, the first electrode ring, the transition line, the second electrode ring, and the second wire are sequentially coupled through the corresponding discharge holes to form a discharge loop;

[0037] The discharge holes of each electrode ring provide a discharge zone, and the transition wire, the first conductor, and the second conductor all have a discharge end that is located in the discharge zone and fits with the electrode ring body in a gap so as to be coupled to the corresponding electrode ring.

[0038] Optionally, the transition line and the conducting wire both penetrate into the liner along the axial direction of the inner tube and are bent to reach the discharge area, so that the discharge end is located in the discharge area.

[0039] Optionally, the shock wave balloon catheter includes a control handle connected between the interface and the multi-section plug, and the control handle has a control switch for controlling the host to supply power to the electrode assembly through a wire.

[0040] Optionally, the conductive area of ​​the multi-section plug includes:

[0041] Two electrode areas, respectively used to be coupled to the electrode assembly through wires;

[0042] A ground wire area, used for connecting to a ground wire of the host;

[0043] An indicator light area, used to indicate the standby state of the shock wave balloon catheter;

[0044] The control area is electrically connected to the control switch and is used to receive a trigger signal of the control switch.

[0045] The shock wave balloon catheter of the present application has at least the following technical effects:

[0046] When the balloon of the present application is filled with liquid, the host can supply power to the electrode assembly through the conductive area of ​​the multi-section plug, discharge the electrode assembly through the wire to penetrate the liquid, and cause the liquid to have a liquid-electric effect, resulting in rapid vaporization and expansion of the liquid and inducing a shock wave, which pushes the elastic end to penetrate forward, and helps the elastic end to pass through the chronic occlusive lesions in the blood vessels.

[0047] The shock wave balloon catheter of this embodiment adopts a multi-section plug, which improves the convenience and reliability of connecting to the host. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 This is a schematic diagram of the structure of a shock wave balloon catheter in one embodiment of the present application;

[0049] Figure 2 for Figure 1 Schematic diagram of the structure of the mid-balloon catheter;

[0050] Figure 3 for Figure 1 A schematic diagram of the structure of a multi-section plug;

[0051] Figure 4 for Figure 1 A magnified view of part A;

[0052] Figure 5 This is a schematic diagram of the structure of an electrode assembly in a shock wave balloon catheter in one embodiment of the present application;

[0053] Figure 6 This is a schematic structural diagram of a balloon catheter in a shock wave balloon catheter according to an embodiment of the present application;

[0054] Figure 7 This is a schematic structural diagram of an elastic end of a balloon catheter in a shock wave balloon catheter according to an embodiment of the present application;

[0055] Figure 8 This is a schematic structural diagram of an elastic end of a balloon catheter in a shock wave balloon catheter according to an embodiment of the present application;

[0056] The reference numerals in the figures are described as follows:

[0057] 100, balloon catheter; 130, balloon body; 140, fluid channel; 150, interface; 160, reinforcement; 200, elastic end; 210, tightly wound section; 220, loosely wound section; 300, electrode assembly; 400, multi-section plug; 410, conductive area; 420, wire; 500, host; 510, jack; 600, control handle;

[0058] 110, inner tube; 111, first development mark; 120, outer tube; 121, open mouth; 122, second development mark;

[0059] 310, gasket; 320, electrode ring; 321, first electrode ring; 322, second electrode ring; 323, ring wall; 330, discharge hole; 331, first discharge hole; 332, second discharge hole; 340, transition line;

[0060] 421, first conductor; 422, second conductor; 411, electrode area; 412, ground area; 413, indicator light area; 414, control area. DETAILED DESCRIPTION

[0061] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0062] It should be noted that when a component is referred to as being "connected" to another component, it may be directly connected to the other component or there may be a central component. When a component is referred to as being "disposed on" another component, it may be directly disposed on the other component or there may be a central component at the same time.

[0063] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0064] In this application, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number or order of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0065] In this application, the terms "comprises" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a system, product or device comprising a series of units is not necessarily limited to those units explicitly listed, but may include other units not explicitly listed or inherent to these products or devices.

[0066] In the present application, the terms "corresponding", "corresponding", "matching", "adaptable", such as "B corresponding to A", "B corresponding to A", "A corresponds to B", or "B corresponds to A", indicate that B has a corresponding relationship with A in shape, position or function, and B can be determined according to A. Determining B according to A does not mean determining B only according to A, but B can also be determined according to A and / or other information.

[0067] In the field of interventional medical device technology, the direction close to the operator is generally defined as the proximal end or the proximal side, and the direction away from the operator is defined as the distal end or the distal side. The direction of the central axis of rotation of an object such as a cylinder or a tube is defined as the axial direction. The radial direction refers to the direction perpendicular to the axial direction and along the diameter or radius. The circumferential direction is the direction around the axis of an object such as a cylinder or a tube (perpendicular to the axis and perpendicular to the cross-sectional radius).

[0068] See also Figure 1 to Figure 3 An embodiment of the present application provides a shock wave balloon catheter 100, comprising a balloon catheter 100, an electrode assembly 300, a multi-section plug 400, and a host 500. The balloon catheter 100 has a balloon body 130 that can be filled with fluid, and the distal end of the balloon catheter 100 has an elastic end 200 composed of a coil spring. The electrode assembly 300 is located in the balloon body 130, and is used to discharge the fluid and drive the elastic end 200 to move accordingly. The multi-section plug 400 has a plurality of conductive areas 410 that are isolated from each other along the insertion direction, and each conductive area 410 is connected to the electrode assembly 300 through a wire 420. The host 500 is provided with a socket 510 that matches the multi-section plug 400, and is used to supply power to the electrode assembly 300.

[0069] When the balloon body 130 is filled with fluid such as liquid, the host 500 can supply power to the electrode assembly 300 through the conductive area 410 of the multi-section plug 400. The host 500 serves as an energy supply unit to provide energy to the electrode assembly 300, and discharges the electrode assembly 300 through the wire 420 to break through the liquid, causing the liquid to have a liquid-electric effect, resulting in rapid vaporization and expansion of the liquid and triggering a shock wave, which pushes the elastic end 200 to penetrate forward, helping to penetrate the chronic occlusive lesions in the blood vessel.

[0070] The shock wave balloon catheter 100 of this embodiment adopts a multi-section plug 400, which improves the convenience and reliability of connecting to the host 500.

[0071] The balloon catheter 100 includes an inner tube 110, an outer tube 120, a balloon body 130, and an interface 150 connected to the proximal end of the outer tube 120. The interior of the inner tube 110 is a guide wire channel, the elastic end 200 is connected to the distal end of the inner tube 110, and the electrode assembly 300 is installed on the outer wall of the inner tube 110. The outer tube 120 is outside the inner tube 110, and the radial gap between the inner tube 110 and the outer tube 120 is a fluid channel 140. The balloon body 130 is located at the outer periphery of the inner tube 110 and is sealed and connected to the distal end of the outer tube 120, and the interior of the balloon body 130 is connected to the fluid channel 140. The interface 150 is used to supply fluid via the fluid channel 140, and the guide wire 420 extends into the balloon catheter 100. The interface 150 is, for example, a three-way interface, and one interface of the three-way interface is used to supply fluid. The outer surface of the outer tube to which the proximal end of the interface member 150 is connected is provided with a reinforcing member 160 for improving the structural strength.

[0072] See also Figure 4 , the guide wire can be matched with the shock wave balloon catheter 100 in any of the following ways: (1) the inner tube 110 extends proximally to the interface 150 and the proximal end of the guide wire channel is open to the interface 150, and the guide wire can enter the guide wire channel along the interface 150. (2) the proximal end of the inner tube 110 is butted against the wall of the outer tube 120, the proximal end of the guide wire channel is open to the wall of the outer tube 120, and the wall of the outer tube 120 forms an open opening 121 accordingly, and the guide wire can enter the guide wire channel along the pipe of the outer tube 120. It can be understood that at this time, on the distal side of the open opening 121, the radial gap between the inner tube 110 and the outer tube 120 is the fluid channel 140. On the proximal side of the open opening 121, the shock wave balloon catheter 100 only includes the outer tube 120 (excluding the inner tube 110), and the space inside the pipe of the outer tube 120 is used as a whole to supply fluid and for the guide wire 420 to extend into the balloon catheter 100.

[0073] In some embodiments, the balloon catheter 100 is provided with a developing mark, which includes a first developing mark 111 provided on the outer surface of the inner tube 110 in the balloon body 130, and a second developing mark 122 provided on the tube wall of the outer tube 120. The developing mark may be, for example, a developing ring.

[0074] See also Figure 5 The electrode assembly 300 includes a liner 310, an electrode ring 320, and a transition line 340. The liner 310 is installed on the outer surface of the inner tube 110. The electrode ring 320 is installed on the outer surface of the liner 310, including a first electrode ring 321 and a second electrode ring 322 arranged along the axial direction, and each electrode ring 320 is provided with two discharge holes 330. The transition line 340 is coupled to different electrode rings 320 through the discharge holes 330. The two discharge holes 330 are provided on two ring walls 323 on the radially opposite sides of the electrode ring 320.

[0075] The wire 420 includes a first wire 421 and a second wire 422. The first wire 421 is coupled to the first electrode ring 321 and a corresponding conductive area 410 of the multi-section plug 400 through the discharge hole 330. The second wire 422 is coupled to the second electrode ring 322 and a corresponding conductive area 410 of the multi-section plug 400 through the discharge hole 330.

[0076] Specifically, each electrode ring 320 includes a first discharge hole 331 and a second discharge hole 332. The transition line 340 is coupled between the second discharge hole 332 of the first electrode ring 321 and the first discharge hole 331 of the second electrode ring 322. The first wire 421 is coupled to the second discharge hole 332 of the first electrode ring 321. The second wire 422 is coupled to the first discharge hole 331 of the second resistor ring. It can be understood that the above scheme does not exclude the existence of other electrode rings 320 other than the first electrode ring 321 and the second electrode ring 322. For example, if there is a third electrode ring 320, the transition line 340 includes a first transition line 340 and a second transition line 340. Among them, the first transition line 340 is coupled between the second discharge hole 332 of the first electrode ring 321 and the first discharge hole 331 of the third electrode ring 320; the second transition line 340 is coupled between the second discharge hole 332 of the third electrode ring 320 and the first discharge hole 331 of the second electrode ring 322.

[0077] When the electrode ring 320 only includes the first electrode ring 321 and the second electrode ring 322 : the first wire 421 , the first electrode ring 321 , the transition line 340 , the second electrode ring 322 , and the second wire 422 are sequentially coupled through the corresponding discharge holes 330 to form a discharge loop.

[0078] The discharge holes 330 of each electrode ring 320 provide a discharge zone, and the space formed by the discharge holes 330 can be regarded as a discharge zone. The transition wire 340, the first wire 421, and the second wire 422 all have a discharge end that is in the discharge zone and fits with the gap of the electrode ring 320 body to couple to the corresponding electrode ring 320. Further, the transition wire 340 and the wire 420 are both inserted into the liner 310 along the axial direction of the inner tube 110, and then bent to reach the discharge zone, so that the discharge end is in the discharge zone. The discharge end fits with the gap of the body of the electrode ring 320, and the discharge end discharges the electrode ring 320 through the fluid. When the balloon body 130 is filled with liquid, the discharge produces a hydroelectric effect, which prompts the balloon catheter 100 to move, driving the elastic end to move accordingly.

[0079] In some embodiments, the electrode assembly 300 has a plurality of discharge locations (which can be understood as a group of electrode pairs), and different discharge locations are arranged radially opposite to each other and / or spaced apart in the axial direction, and different discharge locations discharge simultaneously. When performing simultaneous discharge, different discharge locations can be respectively configured with different wires 420 to be connected to the conductive area 410 of the multi-section plug 400, and the conductive area 410 of the multi-section plug 400 is arranged accordingly.

[0080] In this embodiment, different discharge locations discharge simultaneously, which can dissipate trapped bubbles in other discharge locations, thereby avoiding the adverse effects of bubble retention during the entire discharge process and maintaining the continuity and stability of shock wave energy.

[0081] In some preferred embodiments, different discharge locations are arranged radially opposite to each other and are located at the same axial position. Discharging at the different discharge locations simultaneously can provide the elastic end 200 with a better movement posture, thereby improving the puncture success rate and operation efficiency.

[0082] In some embodiments, the shock wave balloon catheter 100 includes a control handle 600 connected between the interface 150 and the multi-segment plug 400, a TPU protective tube for wrapping the wire is connected between the control handle 600 and the multi-segment plug, and the control handle 600 has a control switch for controlling the host 500 to power the electrode assembly 300 through the wire 420. The control switch can be adjusted manually or by foot to meet clinical operation requirements and facilitate emergency stop during surgery.

[0083] Further, the conductive area 410 of the multi-section plug 400 includes an electrode area 411, a ground area 412, an indicator area 413, and a control area 414. The two electrode areas 411 are respectively used to couple to the electrode assembly 300 through the wire 420. The ground area 412 is used to connect to the ground wire of the host 500. The indicator area 413 is used to indicate the standby state of the shock wave balloon catheter 100. The control area 414 is electrically connected to the control switch, and is used to receive the trigger signal of the control switch.

[0084] See also Figure 6 to Figure 8 The elastic end 200 includes a tightly wound section 210 at the distal end and a loosely wound section 220 at the proximal end. The winding pitch X1 of the tightly wound section 210 is 0.01-0.1 mm, and the winding pitch X2 of the loosely wound section 220 is 0.1-0.5 mm. The axial length L1 of the tightly wound section 210 is 1-5 mm, and the axial length L2 of the loosely wound section 220 is 1-5 mm. The diameter D1 of the tightly wound section 210 is 0.30 mm-0.60 mm, and the diameter D2 of the loosely wound section 220 is 0.60-0.80 mm.

[0085] The diameter of the elastic end 200 has a tendency to decrease from the proximal end to the distal end. Specifically, the diameter of at least a portion of the elastic end 200 has a tendency to decrease from the proximal end to the distal end. For example, Figure 7 and Figure 8 The loosely wound section 220 of the spring end 200 can store elastic potential energy after the shock wave occurs, and when the stored elastic potential is released, it can push the tight wound section 210 forward to penetrate more easily through the chronic occlusive lesion (CTO).

[0086] Optional solutions include: (1) the elastic end 200 is a gradual section with a diameter gradually decreasing from the proximal end to the distal end; (2) the elastic end 200 includes a gradual section with a diameter gradually decreasing from the proximal end to the distal end, and a first straight section on the distal side of the gradual section; (3) the elastic end 200 includes a gradual section with a diameter gradually decreasing from the proximal end to the distal end, and a second straight section on the proximal side of the gradual section; (4) the elastic end 200 includes a gradual section with a diameter gradually decreasing from the proximal end to the distal end, a first straight section on the distal side of the gradual section, and a second straight section on the proximal side of the gradual section.

[0087] Blood vessels at the lesion site are usually fragile and easily damaged, and the flexibility of the elastic end 200 is required to be high. The elastic end 200 of this embodiment is relatively tight, and the flexibility and anti-untwisting strength are improved. When the elastic end 200 encounters resistance, it is not easy to lose elasticity due to untwisting deformation. By setting the tightly wound section 210 and the loosely wound section 220, and reducing the radial size from the proximal end to the distal end, the flexibility of the elastic end 200 is improved as a whole, and it can fit the guide wire more closely, and no fish mouth effect will occur when passing through a tortuous lesion.

[0088] Furthermore, the elastic end 200 is formed by winding a metal wire or a metal flat strip, for example, it can be a coil spring. The wire diameter of the elastic end is 0.05 to 0.1 mm. When a metal flat strip is used, the wire diameter of the metal flat strip is converted according to the diameter of a circle with equal area of ​​its cross section. The compression stroke of the elastic end is 0.1 to 0.5 mm, and the compression stroke here refers to the stroke generated by the compression of two adjacent circles of metal wire or metal flat strip. The elastic end can be made of SUS304 or SUS316. The winding end face of the elastic end 200 is desharpened to make it smooth, so as to avoid damage to the blood vessel after the balloon catheter 100 enters the body. The desharpening method is, for example, laser welding, mechanical grinding, sand blasting, etc.

[0089] The arrangement of the tightly wound section 210 and the loosely wound section 220 can be further combined with multiple discharge locations so that the axial deformation potential energy and the swinging motion of the elastic end 200 cooperate with each other.

[0090] In some embodiments, the gasket 310 is a gasket ring, the radial dimension of the gasket ring is 0.01 to 1 mm, and the number and position of the gasket ring are adapted to the corresponding setting of the electrode ring 320. The material of the gasket ring and the balloon catheter 100 can be Pebax, nylon, polyimide or PTFE to ensure the durability of the balloon body 130, including withstanding high pressure and multiple liquid-electric excitations. The gasket ring and the inner tube 110 can be integrally formed, or the gasket ring and the inner tube are hot-melt formed. The material of the electrode ring 320 can be selected from metal, conductive glue or a mixture of acrylic monomers, wherein the metal is preferably stainless steel, platinum-iridium alloy, copper or silver. The wire 420 and the transition wire 340 are insulated wires, including internal metal wires or metal tubes, and polymer insulation wrapping layers, which further optimize the transmission frequency of the shock wave energy, shorten the pulse frequency, and increase the energy.

[0091] The technical features of the above-mentioned embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification. When the technical features in different embodiments are embodied in the same figure, it can be regarded that the figure also discloses the combination examples of the various embodiments involved.

[0092] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application.

Claims

1. A shock wave balloon catheter, characterized in that: include: A balloon catheter, comprising a balloon body that can be filled with fluid, wherein the distal end of the balloon catheter is provided with an elastic end head formed by a coil spring, and the balloon catheter is provided with a developing mark; An electrode assembly, located in the balloon body, for discharging the fluid and driving the elastic end to move accordingly; A multi-section plug having a plurality of conductive areas that are isolated from each other in circuits along the insertion direction, each of the conductive areas being connected to the electrode assembly via a wire; The host is provided with a socket matched with the multi-section plug and is used to supply power to the electrode assembly.

2. The shock wave balloon catheter according to claim 1, characterized in that: The diameter of the elastic end has an overall decreasing trend from the proximal end to the distal end.

3. The shock wave balloon catheter according to claim 2, characterized in that: The elastic end includes a tightly wound section at the distal end and a loosely wound section at the proximal end.

4. The shock wave balloon catheter according to claim 3, characterized in that: The winding pitch of the tightly wound section is 0.01-0.1 mm, the winding pitch of the loosely wound section is 0.1-0.5 mm, the axial length of the tightly wound section is 1-5 mm, and the axial length of the loosely wound section is 1-5 mm.

5. The shock wave balloon catheter according to claim 3, characterized in that: The diameter of the tightly wound section is 0.30 mm to 0.60 mm, and the diameter of the loosely wound section is 0.60 mm to 0.80 mm.

6. The shock wave balloon catheter according to claim 3, characterized in that: The wire diameter of the elastic end is 0.05-0.1 mm, and the compression stroke of the elastic end is 0.1-0.5 mm.

7. The shock wave balloon catheter according to claim 3, characterized in that: The electrode assembly has a plurality of discharge locations, and different discharge locations are arranged opposite to each other in a radial direction.

8. The shock wave balloon catheter according to claim 1, characterized in that: The balloon catheter comprises: The inner tube has a guide wire channel inside, the elastic end is connected to the distal end of the inner tube, and the electrode assembly is installed on the outer wall of the inner tube; An outer tube is located outside the inner tube, and a radial gap between the inner tube and the outer tube is a fluid channel; A balloon body, which is located at the outer periphery of the inner tube and is sealed and connected to the distal end of the outer tube, and the interior of the balloon body is communicated with the fluid channel; an interface member connected to the proximal end of the outer tube and used for supplying fluid through the fluid channel and for allowing the guide wire to extend into the balloon catheter; The inner tube extends proximally to the interface component and the proximal end of the guidewire channel opens to the interface component; or The proximal end of the inner tube is butted against the tube wall of the outer tube, and the proximal end of the guide wire channel is open to the tube wall of the outer tube.

9. The shock wave balloon catheter according to claim 8, characterized in that: The electrode assembly comprises: A liner installed on the outer surface of the inner tube; An electrode ring is installed on the outer surface of the liner, including a first electrode ring and a second electrode ring arranged along the axial direction, and each electrode ring has two discharge holes; A transition line coupled to different electrode rings through the discharge holes; The wire comprises: A first conductive wire is coupled to the first electrode ring and a conductive area corresponding to the multi-section plug through the discharge hole; A second wire is coupled to the second electrode ring and a conductive area corresponding to the multi-section plug through the discharge hole; The first wire, the first electrode ring, the transition line, the second electrode ring, and the second wire are sequentially coupled through the corresponding discharge holes to form a discharge loop; The discharge holes of each electrode ring provide a discharge zone, and the transition wire, the first conductor, and the second conductor all have a discharge end that is located in the discharge zone and fits with the electrode ring body in a gap so as to be coupled to the corresponding electrode ring.

10. The shock wave balloon catheter according to claim 8, characterized in that: The shock wave balloon catheter comprises a control handle connected between the interface and the multi-section plug, the control handle having a control switch for controlling the host to supply power to the electrode assembly through a wire; The conductive area of ​​the multi-section plug includes: Two electrode areas, respectively used to be coupled to the electrode assembly through wires; A ground wire area, used for connecting to a ground wire of the host; An indicator light area, used to indicate the standby state of the shock wave balloon catheter; The control area is electrically connected to the control switch and is used to receive a trigger signal of the control switch.

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