Balloon catheter structure and device

Abstract

The application discloses a balloon catheter structure and device. The balloon catheter structure comprises a tube assembly, a balloon, a first electrode assembly, a second electrode assembly and a trigger electrode assembly. The balloon is sleeved on the tube assembly. The first electrode assembly, the second electrode assembly and the trigger electrode assembly are arranged on the outer surface of the first tube of the tube assembly. The trigger electrode assembly comprises at least one first conductor and a first wire. The first conductor is connected with the first wire. The first conductor is arranged in the interior of the balloon. The device comprises the balloon catheter structure, a high-voltage generator and a trigger transformer. The high-voltage end of the high-voltage generator is connected with the first electrode assembly. The low-voltage end of the high-voltage generator is connected with the second electrode assembly. The trigger transformer is connected with the trigger electrode assembly. Compared with the prior art, the precision requirement of the balloon catheter is reduced, the processing difficulty and the assembly difficulty are reduced, and the service life is improved.

Description

Technical Field

[0001] This application belongs to the field of medical device technology, specifically relating to a balloon catheter structure and device. Background Technology

[0002] Vascular calcification is a common pathological manifestation in atherosclerosis, hypertension, diabetic vascular complications, vascular injury, chronic kidney disease, and aging. It mainly manifests as increased stiffness and decreased compliance of the blood vessel walls, easily leading to myocardial ischemia, left ventricular hypertrophy, and heart failure, triggering thrombosis and plaque rupture. It is a significant factor contributing to the high incidence and mortality of cardiovascular and cerebrovascular diseases; it is also an important biomarker for atherosclerotic cardiovascular events, stroke, and peripheral vascular disease.

[0003] Balloon catheters are highly effective in vascular modification during surgery. The principle involves an electric arc generated between electrodes, producing plasma with extremely low internal resistance. Simultaneously, a shock wave propagates outwards. This shock wave passes through the balloon, its outer surface adhering closely to the soft tissue of the blood vessel, reaching the calcified lesion area with extremely high acoustic resistance. The lesion absorbs energy, creating cracks, thus achieving vascular modification.

[0004] Existing balloon catheters require a distance between the cathode and anode accurate to 0.001 mm to 0.01 mm. Due to the high precision requirements and complex assembly process, current technology employs injecting a liquid with adjusted conductivity near the cathode and anode to increase the solubility of the conductive liquid and thus reduce the required distance between them. However, this method carries significant risks. If the balloon surrounding the cathode and anode ruptures, it can lead to unknown risks and even threaten the patient's life. Furthermore, during operation, the increased distance between the cathode and anode and the decreased solubility of the conductive liquid reduce the product's lifespan.

[0005] Therefore, there is an urgent need to propose a balloon catheter structure and device to improve the above problems. Summary of the Invention

[0006] In view of the shortcomings or deficiencies of the prior art, the technical problem to be solved by this application is to provide a balloon catheter structure and device.

[0007] To solve the above-mentioned technical problems, this application provides the following technical solution:

[0008] This application proposes a balloon catheter structure, including: a tube body assembly, a balloon, a first electrode assembly, a second electrode assembly, and a trigger electrode assembly. The balloon is sleeved on the tube body assembly, and the first electrode assembly, the second electrode assembly, and the trigger electrode assembly are spaced apart on the outer surface of the first tube body of the tube body assembly. The trigger electrode assembly includes: at least one first conductor and a first wire, the first conductor being connected to the first wire, and the first conductor being disposed inside the balloon.

[0009] Optionally, in the balloon catheter structure, the first electrode assembly includes: at least one second conductor and a second wire, the second conductor being connected to the second wire, and the second conductor being disposed inside the balloon.

[0010] Optionally, in the balloon catheter structure, the second electrode assembly includes at least one third conductor and a third wire, the third conductor being connected to the third wire, and the third conductor being disposed inside the balloon.

[0011] Optionally, in the balloon catheter structure, the first conductor is further provided with a protrusion extending toward the second conductor and / or the third conductor; or, the second conductor and / or the third conductor is provided with a protrusion extending toward the first conductor.

[0012] Optionally, in the balloon catheter structure, the cross-sectional shape of the protrusion includes a triangle, trapezoid, fan-shaped, or irregular shape.

[0013] Optionally, in the balloon catheter structure, when the number of protrusions is two or more, the radial direction of the first tube body corresponding to the central axis of one of the protrusions intersects the radial direction of the first tube body corresponding to the central axis of the other protrusion.

[0014] Optionally, in the balloon catheter structure, the intersecting arrangement includes: a 30° angle, a 45° angle, a 60° angle, and / or a 90° angle.

[0015] Optionally, in the balloon catheter structure, the tube assembly further comprises a second tube, a third tube, a fourth tube, and a fifth tube. The first tube is connected to the second tube, the third tube and the fourth tube are conductively disposed within the first tube and the second tube, and the fifth tube is disposed beside the first tube and conductively disposed within the second tube. The first tube and the third tube are provided with corresponding through holes communicating with the interior of the balloon.

[0016] Optionally, in the balloon catheter structure, a conductive medium is provided inside the balloon; the conductive medium includes: a conductive liquid or a conductive gas.

[0017] This application also proposes a shock wave device, including the above-described balloon catheter structure, high-voltage generator, and trigger transformer. The high-voltage end of the high-voltage generator is connected to the first electrode assembly, the low-voltage end of the high-voltage generator is connected to the second electrode assembly, and the trigger transformer is connected to the trigger electrode assembly.

[0018] Compared with the prior art, this application has the following technical effects:

[0019] Compared to existing technologies, this application reduces the precision requirements of the balloon catheter, thereby reducing processing and assembly difficulties. Furthermore, because this application does not have high precision requirements, the conductivity requirements of the conductive medium inside the balloon are also low; physiological saline can even be used directly as the conductive medium, and even if the balloon ruptures, no new risks will be introduced. Moreover, the low precision requirements of this application also result in an improved lifespan. Attached Figure Description

[0020] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0021] Figure 1 : A schematic diagram of the structure of the tube assembly in Embodiment 1 of this application;

[0022] Figure 2 :like Figure 1 Left view of the structure shown;

[0023] Figure 3 :like Figure 1 Right view of the structure shown;

[0024] Figure 4 : A schematic diagram of the balloon structure in Embodiment 1 of this application;

[0025] Figure 5 : A first-angle schematic diagram of the combination of the first electrode assembly, the second electrode assembly, and the trigger electrode assembly in Embodiment 1 of this application;

[0026] Figure 6 :like Figure 5 Side view of the structure shown;

[0027] Figure 7 :like Figure 5 A second-angle schematic diagram of the structure shown;

[0028] Figure 8 :like Figure 5A schematic diagram of the structure shown from the third angle;

[0029] Figure 9 : A schematic diagram of the structure of Embodiment 1 of this application;

[0030] Figure 10 : A schematic diagram of the combination of the first electrode assembly, the second electrode assembly, and the trigger electrode assembly in Embodiment 2 of this application;

[0031] Figure 11 : A schematic diagram of Embodiment 3 of this application;

[0032] Figure 12 : A schematic diagram of Embodiment 4 of this application;

[0033] Figure 13 : A schematic diagram of Embodiment 5 of this application;

[0034] Figure 14 : A schematic diagram of Embodiment 6 of this application;

[0035] Figure 15 : A schematic diagram of Embodiment 7 of this application;

[0036] Figure 16 : A schematic diagram of Embodiment 8 of this application;

[0037] Figure 17 : A schematic diagram of Embodiment 9 of this application;

[0038] Figure 18 : A schematic diagram of Embodiment 10 of this application;

[0039] Figure 19 : A schematic diagram of Embodiment 11 of this application;

[0040] Figure 20 : A schematic diagram of Embodiment 12 of this application;

[0041] In the figure: tube assembly 1, first tube 101, second tube 102, third tube 103, fourth tube 104, fifth tube 105, through hole 106, balloon 2, first electrode assembly 3, second conductor 301, second wire 302, second electrode assembly 4, third conductor 401, third wire 402, trigger electrode assembly 5, first conductor 501, first wire 502, protrusion 503, conductive medium 6, and trigger transformer 7. Detailed Implementation

[0042] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0043] Example 1

[0044] like Figures 1 to 9 As shown in one embodiment of this application, a balloon catheter structure includes: a tube body assembly 1, a balloon 2, a first electrode assembly 3, a second electrode assembly 4, and a trigger electrode assembly 5. The balloon 2 is sleeved on the tube body assembly 1. The first electrode assembly 3, the second electrode assembly 4, and the trigger electrode assembly 5 are spaced apart on the outer surface of the first tube body 101 of the tube body assembly 1. The trigger electrode assembly 5 includes: at least one first conductor 501 and a first wire 502. The first conductor 501 is connected to the first wire 502, and the first conductor 501 is disposed inside the balloon 2.

[0045] In this embodiment, the balloon 2 is sleeved on the tube assembly 1. The first electrode assembly 3, the trigger electrode assembly 5, and the second electrode assembly 4 are sequentially and alternately arranged on the outer surface of the first tube 101 of the tube assembly 1. Of course, those skilled in the art are motivated to change the relative positions of the first electrode assembly 3, the second electrode assembly 4, and the trigger electrode assembly 5 according to actual needs. The number of the first conductor 501 is set to one, and those skilled in the art are motivated to adjust its number accordingly. The first conductor 501 is connected to the first wire 502 and is disposed inside the balloon 2. In the actual application of this embodiment, that is, after this embodiment is energized, the first electrode assembly 3 serves as the high-voltage end and the second electrode assembly 4 serves as the low-voltage end. By adding the trigger electrode assembly 5, after this embodiment is energized, the first conductor 501 of the trigger electrode assembly 5 can be broken down over a long distance to form plasma. Since the internal resistance of the plasma is small, it is equivalent to a short circuit between the high-voltage end and the first conductor 501, which instantly reduces the electrical distance between the high-voltage end and the low-voltage end, actively inducing the breakdown between the high-voltage end and the low-voltage end, and releasing a shock wave. Compared to existing technologies, in this embodiment, the distance accuracy between the second conductor 301 and the third conductor 401 only needs to be between 0.01mm and 0.1mm, reducing the distance accuracy requirements between the anode and cathode, thereby reducing processing and assembly difficulties. Furthermore, since this embodiment does not have high requirements for the distance accuracy between the first electrode assembly 3, the second electrode assembly 4, and the trigger electrode assembly 5, the conductivity requirements for the conductive medium 6 inside the balloon 2 are not high; even physiological saline can be used directly as the conductive medium 6, and even if the balloon 2 is damaged, no new risks will be introduced. Moreover, in existing technologies, the arc generated between the cathode and anode causes metal melting, increasing the distance between the cathode and anode and thus affecting the product's lifespan. However, because this embodiment reduces the distance accuracy requirements between the anode and cathode, the lifespan of this embodiment is also improved compared to existing technologies.

[0046] Specifically, the first conductor 501 is further provided with a protrusion 503 extending toward the first electrode assembly 3 and / or the second electrode assembly 4. By providing the protrusion 503, the first conductor 501 is made easier to break down by utilizing the principle of tip discharge.

[0047] Specifically, the first electrode assembly 3 includes at least one second conductor 301 and a second wire 302, the second conductor 301 being connected to the second wire 302, and the second conductor 301 being disposed inside the balloon 2; the second electrode assembly 4 includes at least one third conductor 401 and a third wire 402, the third conductor 401 being connected to the third wire 402, and the third conductor 401 being disposed inside the balloon 2.

[0048] In this embodiment, the number of the second conductor 301 and the third conductor 401 is set to one each. Those skilled in the art will have the motivation to adjust the number of them accordingly. The second conductor 301 is connected to the second wire 302, and the third conductor 401 is connected to the third wire 402. The first conductor 501, the second conductor 301, and the third conductor 401 are all annular structures. The second conductor 301, the first conductor 501, and the third conductor 401 are sequentially sleeved on the outer surface of the first tube 101 and are all disposed inside the balloon 2. The two protrusions 503 on the first conductor 501 extend toward the second conductor 301 and the third conductor 401, respectively.

[0049] Of course, the protrusion 503 may not be provided on the first conductor 501; or, the protrusion 503 extending towards the first conductor 501 may be provided on the second conductor 301 and / or the third conductor 401, which can also serve the purpose of being easily penetrated.

[0050] Optionally, the first conductor 501, the second conductor 301, and the third conductor 401 are made of metallic materials.

[0051] Optionally, the outer surfaces of the first conductor 502, the second conductor 302, and the third conductor 402 are all provided with an insulating layer.

[0052] Optionally, the cross-sectional shape of the protrusion 503 includes, but is not limited to, a triangle, a trapezoid, a fan shape, or an irregular shape.

[0053] In this embodiment, the cross-sectional shape of the protrusion 503 is triangular, which is more conducive to tip discharge.

[0054] Specifically, when there are two or more protrusions 503, the radial direction of the first tube 101 corresponding to the central axis of one protrusion 503 intersects with the radial direction of the first tube 101 corresponding to the central axis of the other protrusion 503.

[0055] In this embodiment, the first conductor 501 is provided with two protrusions 503, which extend toward the first electrode assembly 3 and the second electrode assembly 4 respectively. The central axes of the two protrusions 503 are intersecting in the radial direction of the first tube 101, so that the electric arc generated between the first electrode assembly 3 and the second electrode assembly 4 can be directed in different directions and act on different parts of the lesion, which is beneficial to vascular modification.

[0056] Optionally, the intersection setting includes, but is not limited to, a 30° setting, a 45° setting, a 60° setting, and / or a 90° setting.

[0057] In this embodiment, the central axes of the two protrusions 503 are set at 90° to the radial direction of the first tube 101.

[0058] Specifically, the tube assembly 1 is further provided with a second tube 102, a third tube 103, a fourth tube 104, and a fifth tube 105. The first tube 101 is connected to the second tube 102. The third tube 103 and the fourth tube 104 are conductively disposed within the first tube 101 and the second tube 102. The fifth tube 105 is disposed beside the first tube 101 and is conductively disposed within the second tube 102. The first tube 101 and the third tube 103 are provided with corresponding through holes 106 that communicate with the inside of the balloon 2.

[0059] In this embodiment, the first tube 101 serves as a support for the electrode assembly and is electrically connected to the second tube 102. The third tube 103 and the fourth tube 104 are respectively disposed through the first tube 101 and the second tube 102. The third tube 103 is used to transport the conductive medium 6. Therefore, the third tube 103 and the first tube 101 are respectively provided with through holes 106 that communicate with the inside of the balloon 2, so that the conductive medium 6 can be transported to the inside of the balloon 2. The fourth tube 104 is used for the guide wire. The fifth tube 105 is a wire hole, which is disposed on the side of the first tube 101 and is disposed through the second tube 102.

[0060] In this embodiment, the fifth tube 105 has two arc surfaces for easy storage. Its concave surface is similar to the outer surface of the first tube 101, and its convex surface is similar to the inner surface of the second tube 102.

[0061] Specifically, the diameter of the first tube 101 is smaller than the diameter of the second tube 102 in order to provide space for the fifth tube 105.

[0062] Optionally, the conductive medium 6 includes, but is not limited to, conductive gas or conductive liquid.

[0063] In this embodiment, physiological saline is used as the conductive medium 6 to meet the conductivity requirements.

[0064] Example 2

[0065] like Figure 10 As shown, the difference between this embodiment and embodiment 1 is that the number of first conductors 501 is set to two, the two first conductors 501 are connected by a first wire 502, and two protrusions 503 are respectively disposed on the two first conductors 501. The protrusions 503 on the first conductor 501 near the second conductor 301 extend toward the second conductor 301, and the protrusions 503 on the first conductor 501 near the third conductor 401 extend toward the third conductor 401.

[0066] Example 3

[0067] like Figure 11 As shown, this embodiment proposes a device including the balloon catheter structure, a high-voltage generator, and a trigger transformer 7. The high-voltage end of the high-voltage generator is connected to the first electrode assembly 3, the low-voltage end of the high-voltage generator is connected to the second electrode assembly 4, and the trigger transformer 7 is connected to the trigger electrode assembly 5.

[0068] The structure of the balloon 2 catheter is detailed above and will not be repeated here.

[0069] In this embodiment, the structure of the balloon 2 catheter is the same as in embodiment 1. The high-voltage end of the high-voltage generator is connected to the second wire 302 of the first electrode assembly 3, the low-voltage end of the high-voltage generator is connected to the third wire 402 of the second electrode assembly 4, and the trigger transformer 7 is connected to the first wire 502 of the trigger electrode assembly 5.

[0070] In this embodiment, due to the large distance between the second conductor 301 and the third conductor 401, ignition is difficult, and a shock wave cannot be formed. At this time, the switch of the trigger transformer 7 connected to the first conductor 501 is turned on. The secondary winding of the trigger transformer 7 generates a very small current. After the second conductor 301 of the first electrode assembly 3 is energized, it has an extremely high pulse voltage, capable of breaking down the connection between the first conductor 501 and the second conductor 301, forming a plasma with extremely low internal resistance. This is equivalent to a short circuit between the first electrode assembly 3 and the trigger electrode assembly 5, reducing the distance between the first electrode assembly 3 and the second electrode assembly 4 by at least half. This induces the second conductor 301 of the first electrode assembly 3 to break down the third conductor 401 of the second electrode assembly 4, generating a plasma with greater energy and longer duration, thereby generating a shock wave. This embodiment reduces the assembly precision requirements of the prior art.

[0071] Example 4

[0072] like Figure 12 As shown, this embodiment differs from Embodiment 3 in that the trigger transformer 7 is modified. By opening the switch of the trigger transformer 7 connected to the first conductor 501, a breakdown can be achieved between the first conductor 501 and the second conductor 301, and between the first conductor 501 and the third conductor 401. This is equivalent to a short circuit between the first electrode assembly 3, the second electrode assembly 4, and the trigger electrode assembly 5, inducing the second conductor 301 of the first electrode assembly 3 to break down the third conductor 401 of the second electrode assembly 4. Compared to Embodiment 3, this embodiment can further reduce the required accuracy of the distance between the second conductor 301 and the third conductor 401, allowing for a larger distance between them.

[0073] Example 5

[0074] like Figure 13 As shown, compared with Embodiment 3, this embodiment sets the number of the first conductor 501, the second conductor 301 and the third conductor 401 to two, and the two first conductors 501 are connected in parallel, the two second conductors 301 are connected in parallel, and the two third conductors 401 are connected in parallel, forming another embodiment of this application.

[0075] Example 6

[0076] like Figure 14 As shown, compared with Embodiment 3, this embodiment adds a set of second conductors 301 and third conductors 401. The added set of second conductors 301 and third conductors 401 are connected in series with the original second conductor 301 to form another embodiment of this application.

[0077] Example 7

[0078] like Figure 15 As shown, compared with Embodiment 4, this embodiment sets the number of the first conductor 501, the second conductor 301 and the third conductor 401 to two, and the two first conductors 501 are connected in parallel, the two second conductors 301 are connected in parallel, and the two third conductors 401 are connected in parallel, forming another embodiment of this application.

[0079] Example 8

[0080] like Figure 16 As shown, compared with embodiment 4, this embodiment adds a set of second conductors 301 and third conductors 401. The added set of second conductors 301 and third conductors 401 are connected in series with the original second conductor 301 to form another embodiment of this application.

[0081] Example 9

[0082] like Figure 17 As shown, compared with embodiment 5, this embodiment adds two sets of second conductors 301 and third conductors 401. The two sets of added second conductors 301 and third conductors 401 are connected in series with the original two second conductors 301 to form another embodiment of this application.

[0083] Example 10

[0084] like Figure 18 As shown, compared with embodiment 5, this embodiment adds a set of second conductors 301 and third conductors 401. The added second conductors 301 and third conductors 401 are connected in series with one of the original second conductors 301 to form another embodiment of this application.

[0085] Example 11

[0086] like Figure 19 As shown, compared with Embodiment 7, this embodiment adds two sets of second conductors 301 and third conductors 401. The two sets of added second conductors 301 and third conductors 401 are connected in series with the original two second conductors 301 to form another embodiment of this application.

[0087] Example 12

[0088] like Figure 20 As shown, compared with embodiment 7, this embodiment adds a set of second conductors 301 and third conductors 401. The added second conductors 301 and third conductors 401 are connected in series with one of the original second conductors 301 to form another embodiment of this application.

[0089] In the description of this application, unless otherwise expressly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0090] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0091] In the description of this embodiment, the terms "upper," "lower," "left," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0092] The above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. The preferred embodiments have been described in detail. Those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this application without departing from the spirit and scope of the technical solutions of this application, and all such modifications and substitutions should be covered within the scope of the claims of this application.

Claims

1. A balloon catheter structure, characterized in that, include: The tube assembly includes a balloon, a first electrode assembly, a second electrode assembly, and a trigger electrode assembly. The balloon is sleeved on the tube assembly, and the first electrode assembly, the second electrode assembly, and the trigger electrode assembly are spaced apart on the outer surface of the first tube of the tube assembly. The trigger electrode assembly includes: at least one first conductor and a first wire, wherein the first conductor is connected to the first wire and the first conductor is disposed inside the balloon. The first electrode assembly serves as the high-voltage end, and the second electrode assembly serves as the low-voltage end. When energized, the first conductor is broken down over a long distance, forming plasma.

2. The balloon catheter structure according to claim 1, characterized in that, The first electrode assembly includes: at least one second conductor and a second wire, the second conductor being connected to the second wire, and the second conductor being disposed inside the balloon.

3. The balloon catheter structure according to claim 2, characterized in that, The second electrode assembly includes at least one third conductor and a third wire, wherein the third conductor is connected to the third wire and is disposed inside the balloon.

4. The balloon catheter structure according to claim 3, characterized in that, The first conductor is further provided with a protrusion extending toward the second conductor and / or the third conductor; or, the second conductor and / or the third conductor is provided with a protrusion extending toward the first conductor.

5. The balloon catheter structure according to claim 4, characterized in that, The cross-sectional shape of the protrusion includes triangle, trapezoid, fan shape or irregular shape.

6. The balloon catheter structure according to claim 4 or 5, characterized in that, When there are two or more protrusions, the radial direction of the first tube body corresponding to the central axis of one of the protrusions intersects with the radial direction of the first tube body corresponding to the central axis of the other protrusion.

7. The balloon catheter structure according to claim 6, characterized in that, The intersection settings include: 30°, 45°, 60° and / or 90°.

8. The balloon catheter structure according to any one of claims 1 to 5, characterized in that, The tube assembly also includes a second tube, a third tube, a fourth tube, and a fifth tube. The first tube is connected to the second tube. The third tube and the fourth tube are connected within the first tube and the second tube. The fifth tube is located beside the first tube and is connected within the second tube. The first tube and the third tube have corresponding through holes that communicate with the inside of the balloon.

9. The balloon catheter structure according to any one of claims 1 to 5, characterized in that, The balloon contains a conductive medium; The conductive medium includes: a conductive liquid or a conductive gas.

10. An apparatus comprising a balloon catheter structure as described in any one of claims 1 to 9, a high-voltage generator, and a trigger transformer, wherein the high-voltage end of the high-voltage generator is connected to a first electrode assembly, the low-voltage end of the high-voltage generator is connected to a second electrode assembly, and the trigger transformer is connected to the trigger electrode assembly.

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