Shock wave balloon catheter

Abstract

The utility model discloses a shock wave balloon catheter which comprises a balloon, a shock wave generating part is arranged in the balloon, the shock wave generating part at least comprises two electrode assemblies, one end of the balloon is connected with an outer tube, an inner tube is arranged in the outer tube, the other end of the outer tube is connected with a catheter seat, and the outer side of the catheter seat is connected with a high-voltage pulse power supply. The shock wave generating part at least comprises two electrode assemblies, and the electrode assemblies are arranged on the inner pipe in a sleeving mode and are arranged at intervals; at least two discharge channels are arranged outside the inner tube, and all the discharge channels of all the electrode assemblies are not located on the same axial side of the inner tube. According to the shock wave balloon catheter, the electrode assembly is provided with the inner-layer electrode structure, the middle-layer electrode structure and the outer-layer electrode structure, the inner electrode is annular, the position of the discharge channel can be freely arranged, the discharge channel is arranged above the inner electrode, and the wire is located in the inner electrode, so that the wire cannot be damaged by arc discharge when shock waves are generated; and the service life of the inner shock wave conduit is greatly prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of shock wave balloon catheter, especially to a shock wave balloon catheter. BACKGROUND

[0002] Lithotripsy is an effective means of destroying calcified lesions based on the liquid electricity effect, the shock wave catheter combines the traditional balloon catheter technology with extracorporeal shock wave lithotripsy, after expanding the balloon to make it adhere to the blood vessel wall, the high pressure pulse is applied on the balloon catheter electrode assembly through the intravascular shock wave treatment equipment, the filling liquid of the balloon is instantaneously gasified and rapidly liquefied under the high voltage electric field, and the strong shock wave is generated in the treatment site, the shock wave and the calcified plaque in the blood vessel interact to produce stress, and the calcified plaque on the surface and deep layer of the blood vessel is cracked.

[0003] The shock wave balloon electrode in the prior art usually adopts a parallel structure or a three-layer annular structure, wherein the parallel structure is directly exposed to the lower side of the arc generation point, and the electrode wire is directly exposed to the lower side of the arc generation point, and the discharge generation process generates high temperature and shock wave, which easily damages the wire, seriously affecting the service life of the shock wave balloon catheter. The three-layer annular structure electrode is divided into three layers, the outer layer is a metal ring with a pair of through holes, the middle layer is an insulating layer with a pair of through holes, and the through holes of the outer layer and the middle layer are arranged in concentric. The inner layer is a flat metal structure. In work, arc discharge occurs at the through hole to generate a shock wave. However, the electrode assembly process of this structure is difficult. The inner electrode needs to be symmetrically bonded on a circular inner tube with a diameter less than 1mm, which is difficult to assemble, has a low yield, and the glue is easy to block the discharge hole during assembly. UTILITY MODEL CONTENTS

[0004] In view of the above technical problems to be solved, the utility model provides a shock wave balloon catheter.

[0005] The purpose of the utility model can be achieved by adopting the following technical scheme:

[0006] A shock wave balloon catheter, comprising a balloon, an impact wave generating component arranged in the balloon, the impact wave generating component comprising at least two electrode assemblies, one end of the balloon being connected with an outer tube, an inner tube being arranged in the outer tube, the other end of the outer tube being connected with a catheter seat, a high-voltage pulse power supply being connected to the outer side of the catheter seat, the impact wave generating component comprising at least two electrode assemblies, the electrode assemblies being sleeved on the inner tube and being arranged at intervals, at least two discharge channels being arranged outside the inner tube, and all the discharge channels of all the electrode assemblies not being located on the same axial side of the inner tube.

[0007] As a further improvement of the above technical scheme:

[0008] Preferably, the electrode assembly comprises a first electrode assembly and a second electrode assembly, and the first electrode assembly and the second electrode assembly are mounted on the inner tube; the first electrode assembly comprises a first inner electrode and a second inner electrode which are mounted on the outer side of the inner tube in a spaced manner, and the second electrode assembly comprises a third inner electrode and a fourth inner electrode which are mounted on the outer side of the inner tube in a spaced manner.

[0009] Preferably, a first insulating ring is arranged on the outer side of the first inner electrode and the second inner electrode.

[0010] Preferably, a first outer electrode is mounted on the outer side of the first insulating ring, and a first discharge channel and a second discharge channel are formed in the first outer electrode.

[0011] Preferably, a second insulating ring is arranged on the outer side of the third inner electrode and the fourth inner electrode.

[0012] Preferably, a second outer electrode is mounted on the outer side of the second insulating ring, and a third discharge channel and a fourth discharge channel are formed in the second outer electrode.

[0013] Preferably, a first wire is connected between the second inner electrode and the third inner electrode, and a second wire and a third wire are respectively mounted on the first inner electrode and the fourth inner electrode.

[0014] Preferably, the electrode assembly comprises a first electrode assembly and a second electrode assembly, and the first electrode assembly and the second electrode assembly are mounted on the inner tube; each electrode assembly is provided with three inner electrodes which are arranged in a spaced manner, an insulating ring is arranged on the outer side of the inner electrode, an outer electrode is mounted on the outer side of the insulating ring, and the outer electrode is provided with three discharge channels.

[0015] Preferably, the electrode assembly is provided with three electrode assemblies, and each electrode assembly comprises at least two inner electrodes which are mounted on the outer side of the inner tube in a spaced manner.

[0016] Compared with the prior art, the shock wave balloon catheter has the following advantages:

[0017] (1) By arranging the inner, middle and outer three-layer electrode structure on the electrode assembly, the inner electrode is annular, the position of the discharge channel can be arbitrarily set, the discharge channel is arranged above the inner electrode, and the wire is located inside the inner electrode, so that the arc discharge does not damage the wire when the shock wave is generated, and the service life of the shock wave catheter is greatly improved.

[0018] (2) The inner electrode structure adopts a circular ring structure, can be coaxially sleeved outside the inner tube, and can be fixed on the inner tube by welding, heat shrinkage or adhesion, so that the assembly process is simple and the yield is high.

[0019] (3) The outer diameter of the circular ring structure inner electrode is small, so that the outer diameter of the balloon can be reduced, and it is easier to hit the calcified stenosis position. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the shockwave balloon catheter of this utility model;

[0021] Figure 2 This is a schematic diagram of the shock wave generating component in Embodiment 1 of this utility model;

[0022] Figure 3 for Figure 2 A sectional view;

[0023] Figure 4 This is a schematic diagram of the wire connection structure of the shock wave generating component in Embodiment 1 of this utility model;

[0024] Figure 5 This is a schematic diagram of the wire connection structure of the shock wave generating component in Embodiment 2 of this utility model;

[0025] Figure 6 This is a schematic diagram of the shock wave generating component in Embodiment 3 of this utility model;

[0026] Figure 7 This is a schematic diagram of the shock wave generating component in Embodiment 4 of this utility model;

[0027] Figure 8 This is a schematic diagram of the wire connection structure of the shock wave generating component in Embodiment 4 of this utility model.

[0028] The annotations in the attached figures are explained as follows:

[0029] 10. Balloon; 20. Shock wave generating component; 20a. First electrode assembly; 20b. Second electrode assembly; 201a. First inner electrode; 201b. Second inner electrode; 201c. Third inner electrode; 201d. Fourth inner electrode; 202. First insulating ring; 203. Second insulating ring; 204. First outer electrode; 205. Second outer electrode; 206a. First discharge channel; 206b. Second discharge channel; 206c. Third discharge channel; 206d. Fourth discharge channel; 30. Outer tube; 40. Inner tube; 50. Catheter seat; 60. High-voltage pulse power supply; 701. First lead wire; 702. Second lead wire; 703. Third lead wire. Detailed Implementation

[0030] To enable those skilled in the art to understand the technical solution of this utility model more clearly, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings, but the implementation of this utility model is not limited thereto.

[0031] Example 1

[0032] like Figures 1-4As shown, this embodiment provides a shock wave balloon catheter, including a balloon 10, a shock wave generating component 20 disposed inside the balloon 10, an outer tube 30 connected to one end of the balloon 10, and the balloon being filled with a conductive fluid made of polyamide, preferably Grilamid, but also Pebax, FEP, nylon, polyimide or PTFE. The outer tube 30 is made of polyamide, preferably Grimemid, but can also be FEP, nylon, or PTFE. An inner tube 40 is provided inside the outer tube 30. The inner tube 40 is made of polyamide, preferably Polyimide, but can also be FEP, nylon, or PTFE. One end of the outer tube 30 is connected to a catheter hub 50. The catheter hub 50 is connected to an intravascular shockwave therapy device through a catheter plug. A high-voltage pulse power supply 60 is connected to the outside of the catheter hub 50. The high-voltage pulse power supply 60 can provide power. The shockwave generating component 20 includes a first electrode assembly 20a and a second electrode assembly 20b. The first electrode assembly 20a and the second electrode assembly 20b are sleeved and installed on the inner tube 40. The two electrode assemblies are arranged coaxially with a gap between them.

[0033] In this embodiment, the first electrode assembly 20a includes a first inner electrode 201a and a second inner electrode 201b installed on the outer circumference of the inner tube 40. The first inner electrode 201a and the second inner electrode 201b are annular structures and can be made of gold, silver, copper, tantalum, stainless steel, tungsten alloy or platinum-iridium alloy, preferably stainless steel. The first inner electrode 201a and the second inner electrode 201b are arranged at intervals.

[0034] In this embodiment, the first inner electrode 201a and the second inner electrode 201b are covered with a first insulating ring 202. The material of the first insulating ring 202 is one or more of the following materials: polyamide, polyether block amide PEBA, polyethylene terephthalate PET, polyimide, or nylon.

[0035] In this embodiment, a first outer electrode 204 is fitted over a first insulating ring 202, and a first discharge channel 206a and a second discharge channel 206b are formed on the first outer electrode 204. The length of the first insulating ring 202 is longer than the length of the first outer electrode 204. In this embodiment, the first discharge channel 206a and the second discharge channel 206b are located on the same axial plane of the first outer electrode 204.

[0036] In this embodiment, the second electrode assembly 20b includes a third inner electrode 201c and a fourth inner electrode 201d installed on the outer circumference of the inner tube 40. The third inner electrode 201c and the fourth inner electrode 201d are annular structures and are coaxially arranged at intervals. The material can be gold, silver, copper, tantalum, stainless steel, tungsten alloy or platinum-iridium alloy, preferably stainless steel.

[0037] In this embodiment, the third inner electrode 201c and the fourth inner electrode 201d are covered with a second insulating ring 203. The material of the second insulating ring 203 is one or more of the following materials: polyamide, polyether block amide PEBA, polyethylene terephthalate PET, polyimide, or nylon.

[0038] In this embodiment, a second outer electrode 205 is fitted over a second insulating ring 203. A third discharge channel 206c and a fourth discharge channel 206d are formed on the second outer electrode 205. The length of the second insulating ring 203 is longer than the length of the second outer electrode 205. In this embodiment, the third discharge channel 206c and the fourth discharge channel 206d are located on the same axial plane of the second outer electrode 205, and the first discharge channel 206a and the second discharge channel 206b are located on different axial sides of the inner tube from the third discharge channel 206c and the fourth discharge channel 206d. That is, the centers of the first discharge channel 206a and the second discharge channel 206b are not collinear with the centers of the third discharge channel 206c and the fourth discharge channel 206d.

[0039] like Figure 4 As shown, a first wire 701 is connected between the second inner electrode 201b and the third inner electrode 201c, and the second inner electrode 201b and the third inner electrode 201c are connected through the first wire 701. A second wire 702 and a third wire 703 are respectively installed on the first inner electrode 201a and the fourth inner electrode 201d, and the second wire 702 and the third wire 703 are respectively connected to the positive and negative terminals of the high-voltage pulse power supply 60.

[0040] The working principle of the shockwave balloon catheter in this embodiment is as follows: In actual use, the first inner electrode 201a and the fourth inner electrode 201d in the first electrode assembly 20a and the second electrode assembly 20b are connected to the positive and negative terminals of the high-voltage pulse power supply 60 through the second wire 702 and the third wire 703, respectively. The second inner electrode 201b and the third inner electrode 201c are connected through the first wire 701. During use, high-voltage power is supplied by the high-voltage pulse power supply 60. At this time, the current will break down the conductive liquid at the first inner electrode 201a. After the breakdown reaches a certain level, a discharge channel will be formed at the first discharge channel 206a. The current flows from the first inner electrode 201a through the discharge channel 206a. The current is transmitted to the first external electrode 204, and then to the second discharge channel 206b to form a discharge channel. The current is then transmitted to the third internal electrode 201c through the first wire 701, and then to the third discharge channel 206c to form a discharge channel. The current is then transmitted to the second external electrode 205 to form a discharge channel at the fourth discharge channel 206d, thus forming a current loop. When a large current passes through the first discharge channel 206a, the second discharge channel 206b, the third discharge channel 206c, and the fourth discharge channel 206d, a large amount of energy can be obtained in a very short time. The temperature inside the channel rises sharply, and the heated volume of the channel increases to form a shock wave used to treat the lesion.

[0041] Example 2

[0042] Figure 5 This illustration shows a second embodiment of the shockwave balloon catheter of this invention. The difference between this embodiment and Embodiment 1 lies in the internal electrodes and discharge channels. In this embodiment, each electrode assembly has three internal electrodes and correspondingly three discharge channels. The three discharge channels are not all located on the same axial side of the inner tube. In this embodiment, two discharge channels are located on the same axial side, but these two discharge channels are not adjacent. The third discharge channel is located on the opposite side of the other two discharge channels, that is, the third discharge channel is 180 degrees away from the other two discharge channels.

[0043] In this embodiment, one wire connects to the two discharge channels of the two electrode assemblies in the middle at both ends, and the other two wires connect to the two farthest discharge channels at one end and to the high-voltage pulse power supply at the other end.

[0044] Example 3

[0045] Figure 6 This invention illustrates a second embodiment of the shockwave balloon catheter. The difference between this embodiment and Embodiment 1 lies in the number of electrode assemblies. In this embodiment, there are 3 electrode assemblies, each of which has two discharge channels. The two discharge channels in the same electrode assembly may be located on the same axis or not on the same axis. Not all discharge channels are located on the same axis.

[0046] Example 4

[0047] Figure 7 and Figure 8 This invention illustrates a second embodiment of the shockwave balloon catheter. The difference between this embodiment and embodiment 2 lies in the number of electrode assemblies. This embodiment has 3 electrode assemblies, each with 3 discharge channels. This embodiment has 5 wires, of which 3 wires are connected in the same way as in embodiment 2. The first and second discharge channels of the third electrode assembly are connected to the high-voltage pulse power supply through two wires respectively.

[0048] The above are merely further embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope disclosed by this utility model, based on the technical solution and concept of this utility model, shall fall within the protection scope of this utility model.

Claims

1. A shockwave balloon catheter, characterized in that: The device includes a balloon, a shock wave generating component disposed within the balloon, the shock wave generating component comprising at least two electrode assemblies, an outer tube connected to one end of the balloon, an inner tube disposed within the outer tube, a catheter seat connected to the other end of the outer tube, a high-voltage pulse power supply connected to the outside of the catheter seat, the shock wave generating component comprising at least two electrode assemblies, the electrode assemblies being sleeved on the inner tube and spaced apart; at least two discharge channels are provided outside the inner tube, and not all discharge channels of all electrode assemblies are located on the same axial side of the inner tube.

2. The shockwave balloon catheter according to claim 1, characterized in that: The electrode assembly includes a first electrode assembly and a second electrode assembly, which are mounted on the inner tube. The first electrode assembly includes a first inner electrode and a second inner electrode spaced apart on the outside of the inner tube, and the second electrode assembly includes a third inner electrode and a fourth inner electrode spaced apart on the outside of the inner tube.

3. The shockwave balloon catheter according to claim 2, characterized in that: A first insulating ring is provided on the outer side of the first inner electrode and the second inner electrode.

4. The shockwave balloon catheter according to claim 3, characterized in that: A first external electrode is installed on the outside of the first insulating ring, and a first discharge channel and a second discharge channel are formed on the first external electrode.

5. The shockwave balloon catheter according to claim 3, characterized in that: A second insulating ring is provided on the outer side of the third inner electrode and the fourth inner electrode.

6. The shockwave balloon catheter according to claim 5, characterized in that: A second external electrode is installed on the outside of the second insulating ring, and a third discharge channel and a fourth discharge channel are opened on the second external electrode.

7. The shockwave balloon catheter according to claim 6, characterized in that: A first wire is connected between the second inner electrode and the third inner electrode, and a second wire and a third wire are respectively installed on the first inner electrode and the fourth inner electrode.

8. The shockwave balloon catheter according to claim 1, characterized in that: The electrode assembly includes a first electrode assembly and a second electrode assembly, which are mounted on an inner tube. Each electrode assembly has three spaced inner electrodes, an insulating ring is provided on the outside of the inner electrodes, and an outer electrode is installed on the outside of the insulating ring. The outer electrode has three discharge channels.

9. The shockwave balloon catheter according to claim 1, characterized in that: The electrode assembly is provided in three parts, and each electrode assembly includes at least two inner electrodes that are spaced apart and installed on the outside of the inner tube.

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