Balloon ablation catheter and system
By designing a multi-balloon ablation catheter and using pressure sensor monitoring, the problem of poor operability of balloon ablation catheters in terms of applicability was solved, resulting in more efficient ablation effects and safer surgical procedures.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANGHAI HONGDIAN MEDICAL TECH CO LTD
- Filing Date
- 2024-12-27
- Publication Date
- 2026-04-21
AI Technical Summary
Existing balloon ablation catheters have poor operability in terms of applicability and are difficult to control, resulting in poor ablation effects and long operation time.
A balloon ablation catheter is designed, comprising multiple balloon components and ablation electrodes distributed circumferentially along the catheter body. By independently controlling the inflation and contraction of the balloon, the ablation electrodes can be effectively attached to the tissue, and a pressure sensor is equipped to monitor the attachment pressure.
It improves the operability of the ablation electrode to adhere to the tissue, reduces the difficulty of the placement process, increases the ablation depth and efficiency, reduces the operation time, increases the success rate of the operation, and reduces the risk of vascular perforation.
Smart Images
Figure CN224140926U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of medical device technology, and more particularly to a balloon ablation catheter and system. Background Technology
[0002] Renal denervation (RDN) is a treatment for refractory hypertension. The catheter is inserted through the radial artery into the abdominal aorta via the aortic arch or through the femoral artery into the abdominal aorta and then into the bilateral renal arteries for ablation. This process destroys the sympathetic afferent and efferent nerves located on the adventitia of the renal arteries, weakens the connection between the kidneys and the central nervous system, and thus lowers blood pressure.
[0003] Radiofrequency ablation (RFA) requires precise contact between the electrode and the tissue. Effective electrode contact results in greater ablation depth, higher ablation efficiency, and a higher success rate. Common catheters used in RDN surgery typically reach the renal artery trunk via guidewires, filament-guided bending structures, or auxiliary guiding catheters. Once in place, guidewire-assisted catheters often lack additional feedback and control over the degree of contact. Filament-guided catheters can control the degree of contact to some extent by adjusting the bending angle, but the degree of control is often limited by the catheter's curvature. Existing catheters used in RDN generally lack sufficient control over contact within the human body.
[0004] Therefore, how to improve the technical defects existing in the prior art has always been a problem that ordinary people skilled in the art need to solve. Utility Model Content
[0005] The purpose of this application is to provide a balloon ablation catheter and system that can achieve effective contact between the ablation electrode and the tissue, and is more conducive to operator control, thereby improving surgical efficiency.
[0006] The technical solution provided by this utility model is as follows:
[0007] A balloon ablation catheter, comprising:
[0008] The tube body, the balloon assembly located at the distal end of the tube body, and the ablation electrode;
[0009] The balloon assembly includes at least two balloons, and the at least two balloons are distributed sequentially along the circumference of the tube; the tube has inflation channels corresponding to the balloons one by one, which are suitable for external fluid to enter and exit the balloons;
[0010] The ablation electrode is arranged circumferentially around the side wall of the tube; when part of the balloon is filled with fluid, the ablation electrode located on the opposite side of the fluid-filled balloon is adapted to abut against the tissue to be ablated.
[0011] In some embodiments, the distal end of the tube is provided with a groove, which is arranged around the side wall of the tube, and the balloon assembly is disposed in the groove.
[0012] In some embodiments, the distal sidewall of the tube has a plurality of openings, and the inner sidewall of the tube has a thin film covering the openings at the openings, the thin film forming the balloon;
[0013] When fluid enters the balloon through the inflation channel, the balloon is extruded from the opening.
[0014] In some embodiments, the ablation electrode is located at the distal end of the balloon; or, the ablation electrode is located at the proximal end of the balloon; or, the number of balloon assemblies is at least two, arranged sequentially along the axial direction of the tube, with the ablation electrode located between two adjacent balloon assemblies.
[0015] In some embodiments, the ablation electrode includes a ring electrode nested within the tube body;
[0016] The annular electrode is electrically connected to the control handle via a discharge wire; and / or, a thermocouple is provided on the inner wall of the annular electrode for monitoring the tissue temperature during the ablation process.
[0017] In some embodiments, the distal end of the tube has an adjustable bend, and both the balloon assembly and the annular electrode are disposed in the adjustable bend;
[0018] The tube body is provided with a guide wire channel, through which the guide wire passes to guide the adjustable bending section to bend; or, the annular electrode is located at the distal end of the tube body, and the distal end of the tube body is also provided with a pull wire structure, through which the adjustable bending section is bent.
[0019] In some embodiments, the ablation electrode includes a boss-shaped electrode located at the proximal end of the balloon assembly;
[0020] The boss-shaped electrode is provided with a plurality of injection holes, and an injection channel communicating with the injection holes is opened in the tube body.
[0021] In some embodiments, the distal end of the tube has an adjustable bend, and the balloon assembly and the boss-shaped electrode are both disposed in the adjustable bend; wherein, the tube is provided with a guide wire channel, through which the guide wire passes to guide the adjustable bend to bend.
[0022] In some embodiments, a pressure sensor, disposed on or around the balloon assembly, is used to monitor the contact pressure of the ablation electrode.
[0023] This application also provides a balloon ablation system, comprising:
[0024] A balloon ablation catheter and a control handle located at the proximal end of the balloon ablation catheter;
[0025] The balloon ablation catheter is the balloon ablation catheter provided in any of the above embodiments. The control handle is provided with a connector for connecting to an external pipeline to allow fluid to enter the inflation channel. The control handle is also provided with a control key, which corresponds one-to-one with the inflation channel. Furthermore, a squeezing element is provided below the control key.
[0026] When the control key is pressed down, the extruder squeezes the expansion channel, and the expansion channel is isolated from the external pipeline; when the control key is lifted up, the extruder disengages from the expansion channel, and the expansion channel is connected to the external pipeline.
[0027] The technical advantages of this application are as follows:
[0028] 1. In this application, the balloon ablation catheter is equipped with multiple balloons, each with a corresponding inflation channel, allowing independent control of the inflation and deflation of each balloon. The operator can inflate one balloon to achieve contact between the ablation electrode and the tissue on the opposite side. Furthermore, by adjusting the inflation level of the balloons, the contact effect between the ablation electrode and the tissue can be further enhanced or weakened, making it more effective and convenient for the operator to control, thus improving surgical efficiency. In addition, the operator can inflate multiple balloons simultaneously, thereby increasing the guiding effect of blood flow on the balloon ablation catheter, allowing it to reach the treatment area following the blood flow trend, reducing the difficulty of reaching the treatment area during the procedure.
[0029] 2. In this application, by providing a groove at the location where the balloon assembly is placed in the tube body, the diameter of the balloon ablation catheter does not significantly increase when the balloon is in the contracted state. The balloon assembly in this application can also be configured as an embedded structure, i.e., an opening is made in the side wall of the tube body, the balloon contracts inside the tube body when contracted, and is then extruded from the opening to the outside of the tube body when inflated, without additionally increasing the diameter of the balloon ablation catheter. This improves upon the disadvantages of existing balloon ablation catheters, such as a large diameter of the balloon area after contraction, high risk of thrombosis, and poor maneuverability.
[0030] 3. In this application, the balloon ablation catheter is also equipped with a pressure sensor, which can monitor the contact pressure of the balloon in real time, avoid over-inflation of the balloon leading to vascular perforation, and thus ensure the safety of the operation. Attached Figure Description
[0031] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:
[0032] Figure 1This is a partial three-dimensional structural diagram of the distal end of the balloon ablation catheter provided in one embodiment of this application;
[0033] Figure 2 This is a schematic diagram illustrating an application scenario of the balloon ablation catheter provided in one embodiment of this application;
[0034] Figure 3 This is a plan view of the distal end of the balloon ablation catheter provided in one embodiment of this application, viewed from the proximal end.
[0035] Figure 4 yes Figure 3 The cross-sectional view shown along the AA direction;
[0036] Figure 5 This is a plan view of the distal end of the tube as observed from the proximal end, provided in one embodiment of this application;
[0037] Figure 6 yes Figure 5 The cross-sectional view shown along the BB direction;
[0038] Figure 7 This is a side view of the balloon ablation catheter provided in another embodiment of this application;
[0039] Figure 8 This is a plan view of the distal end of the balloon ablation catheter provided in another embodiment of this application, viewed from the proximal end.
[0040] Figure 9 yes Figure 8 The cross-sectional view shown is along the CC direction.
[0041] Explanation of icon numbers:
[0042] 100. Tube body; 110. Adjustable bend; 120. Expansion channel; 130. Opening; 140. Guide wire channel; 150. Injection channel; 160. Recessed step; 170. Distal end fixing of tube body; 180. Wire channel;
[0043] 200. Balloon;
[0044] 300, Ablation electrode; 310, Injection hole. Detailed Implementation
[0045] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application can also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.
[0046] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the specific implementation methods of this application will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without creative effort.
[0047] To keep the drawings concise, each drawing only schematically shows the parts relevant to this application, and they do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of the components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one."
[0048] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.
[0049] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0050] In the embodiments shown in the accompanying drawings, the directional indications (such as up, down, left, right, front, and back) used to explain the structure and movement of the various components of this application are relative rather than absolute. These descriptions are appropriate when these components are in the positions shown in the drawings. If the descriptions of the positions of these components change, these directional indications also change accordingly.
[0051] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0052] To address the problems of poor operability and difficulty in controlling the contact depth of existing balloon ablation catheters, which leads to poor ablation effects and long operation times, this application provides a balloon ablation catheter that can improve the operator's operability in controlling the contact depth, reduce the operational difficulty of the placement process, thereby increasing the ablation depth, improving ablation efficiency, reducing operation time, and increasing the success rate of the operation.
[0053] In one specific embodiment, see Figures 1 to 4 The balloon ablation catheter includes a tube body 100, a balloon assembly, and an ablation electrode 300. The distal end of the tube body 100 is the treatment adjustment area, and both the balloon assembly and the ablation electrode 300 are located at the distal end of the tube body 100. The balloon assembly includes at least two balloons 200, which are sequentially distributed circumferentially along the tube body 100. The tube body 100 preferably has a multi-lumen structure, with inflation channels 120 corresponding to each balloon 200, suitable for allowing external fluid to enter and exit the balloons 200. This allows the operator to independently control the inflation and deflation of each balloon 200.
[0054] See Figure 1 and Figure 2 The ablation electrode 300 is positioned circumferentially around the sidewall of the tube 100. When the balloon 200 is partially filled with fluid, the filled balloon 200 inflates and forms support with the inner wall of the blood vessel, allowing the surface of the ablation electrode 300 on the opposite side of the inflated balloon 200 to adhere to the tissue to be ablated. Thus, the operator only needs to control the inflation of the opposite balloon 200 to achieve tissue ablation, eliminating the need for twisting the balloon ablation catheter, resulting in higher surgical efficiency and greater ease of operation. Furthermore, by adjusting the inflation degree of the balloon 200, the adhesion effect can be further enhanced or weakened, improving the operator's control over the adhesion level, preventing over-inflation of the balloon 200 that could lead to vascular perforation, while simultaneously increasing the depth of the ablation lesion and ablation efficiency.
[0055] In addition, the operator can simultaneously inflate most or all of the balloons 200 to increase the guiding effect of blood flow on the balloon ablation catheter, allowing the balloon ablation catheter to float in the blood and move with the blood flow to reach the treatment target area. This reduces the difficulty of positioning the balloon ablation catheter and further improves the efficiency of the operation.
[0056] In this embodiment, the balloon 200 is preferably made of a material with low elastic modulus and good elasticity, such as polyurethane, low-density polyethylene, silicone rubber, etc., as the base material of the balloon 200, to ensure that the balloon 200 still has the ability to expand further when it is in a fully inflated state.
[0057] In actual production, the fluid used to fill the balloon 200 to achieve inflation can be cold saline, air, or carbon dioxide. The injection of cold saline, air, or carbon dioxide can be achieved by connecting a saline or compressed air peristaltic pump to the proximal end of the tube 100, which is highly operable.
[0058] Specifically, a control handle is connected to the proximal end of the tubing 100, and an inflation channel 120 passes through the tubing 100 and the control handle. A Luer connector at the proximal end of the control handle connects to a saline or compressed air peristaltic pump. The control handle has control buttons corresponding to each inflation channel 120, allowing independent control of the opening and closing of each channel. Specifically, a compression element is located below each control button; pressing down the control button causes the corresponding compression element to compress the inflation channel 120, isolating it from external tubing. In this way, the fluid already injected into the inflation channel 120 and the balloon 200 is sealed within them, maintaining the balloon 200's current inflation state. Conversely, lifting the control key will disengage the extrusion component from the inflation channel 120. The inflation channel 120 is connected to an external pipeline, allowing fluid to enter and exit the inflation channel 120 and the balloon 200, making it convenient for the operator to adjust the inflation degree of the balloon 200 or to complete the deflation of the balloon 200.
[0059] Preferably, see Figure 1 The balloon assembly contains three balloons 200, which are evenly spaced along the circumference of the tube 100. If ablation of the lesion is required, the two balloons 200 other than the one directly facing the lesion can be inflated until they adhere to the vessel wall, allowing the ablation electrode 300 on the side of the uninflated balloon 200 to fully adhere to the tissue for ablation treatment.
[0060] Of course, in actual production, the number of balloons 200 in the balloon assembly can also be 2 or 4, etc., which is not limited here and is all within the protection scope of this application.
[0061] Furthermore, the number of balloon components can be one, two, or more.
[0062] Taking two balloon assemblies as an example, the two balloon assemblies are arranged longitudinally along the tube body 100, and the number of balloon assemblies in the two balloon assemblies is the same. Specifically, the balloons 200 in the two balloon assemblies are arranged one-to-one and longitudinally along the tube body 100. At this time, the ablation electrode 300 can be located in the middle of the two balloon assemblies, or at the distal end of the distal balloon assembly, or at the proximal end of the proximal balloon assembly.
[0063] In actual production, two balloons 200 arranged in a front-to-back configuration can share a single inflation channel 120 or have separate inflation channels 120. No restrictions are imposed here, and both are within the scope of protection of this application.
[0064] If there is only one balloon assembly, the ablation electrode 300 can be located at the distal or proximal end of the balloon 200.
[0065] In one specific embodiment, see Figure 6 The distal end of the tube body 100 has a groove that surrounds the side wall of the tube body 100, forming a recessed step 160 at the distal end of the tube body 100 with a diameter smaller than the outer diameter of the rest of the tube body 100. This recessed step 160 can be manufactured using processes such as injection molding and grinding. The balloon 200 in the balloon assembly is fixed to this recessed step 160 by means of bonding or heat fusion to ensure that the diameter of the balloon ablation catheter does not significantly increase when the balloon 200 is in a contracted state.
[0066] See Figure 5 In this embodiment, the inflation channels 120 corresponding to the balloon 200 are evenly distributed in the circumference of the tube 100, and the axis of the inflation channel 120 should be a certain distance from the outer wall of the tube 100 to ensure that the surface of the tube 100 after grinding can have sufficient space to be fixedly connected to the balloon 200 without the inflation channels 120 being blocked.
[0067] In a preferred embodiment, see Figures 7 to 9 The balloon assembly can also adopt an embedded structure, with the balloon 200 built into the tube 100. In this way, no additional grinding of the tube 100 is required, and it can be ensured that the overall diameter of the balloon 200 does not significantly exceed the outer diameter of the tube 100 when it is contracted. At this time, the inflation channel 120 corresponding to the balloon 200 can be set at the outermost periphery inside the tube 100 and evenly distributed along the circumference of the tube 100.
[0068] Specifically, an opening 130 is provided on the distal sidewall of the tube 100 (corresponding to the position of the inflation channel 120), and a thin film covering the opening 130 is provided on the inner sidewall of the tube 100. The thin film is made of highly elastic materials such as polyurethane, modified low-density polyethylene, and silicone rubber, and is fixed inside the tube 100 by welding or bonding to form the aforementioned balloon 200.
[0069] Before or after inflation, the membrane can be depressurized and contracted within the tube body 100 without increasing the catheter diameter. This improves upon the disadvantages of the existing balloon 200 catheter, such as large diameter of the balloon 200 area after contraction, high risk of thrombosis, and poor maneuverability. During inflation, when the inflation channel 120 is filled with gas or saline, further inflation or fluid filling causes the membrane to deform under pressure and be extruded through the opening 130 into the tube body 100 to achieve the function of auxiliary adhesion.
[0070] In one example embodiment, the ablation electrode 300 may include a ring electrode nested within the tube body 100. The ring electrode is fixed with a discharge wire by means of laser welding, soldering, resistance welding, etc. The discharge wire passes through the tube body 100 and the control handle, and is connected to a socket near the end of the control handle. Specifically, see... Figure 5The tube body 100 has a wire channel 180 for the discharge wire to pass through, so as to electrically connect the ring electrode and the control handle.
[0071] When the ablation electrode 300 is a ring electrode nested in the tube body 100, a balloon assembly can be set at the distal end and the proximal end of the ablation electrode 300. The balloons 200 in the two balloon assemblies can be set with completely independent inflation channels 120 or set as coplanar balloons 200 (two balloons 200 set back and forth along the axial direction of the tube body 100) sharing the inflation channel 120, so as to achieve more precise control of electrode contact.
[0072] Preferably, a thermocouple can also be installed on the inner wall of the annular electrode to monitor tissue temperature during radiofrequency ablation, allowing the operator to more accurately monitor the temperature of the annular electrode and improve the safety of the procedure. The thermocouple can be fixed to the inner wall of the annular electrode using methods such as adhesive bonding, resistance welding, or soldering.
[0073] Since the copper wire in the thermocouple can also function as a discharge conductor when it is linked with a suitable discharge and temperature monitoring device, the discharge conductor can be omitted in this embodiment, and the thermocouple can be set only on the inner wall of the annular electrode.
[0074] Furthermore, the distal end of the tube body 100 has an adjustable bend 110, on which the balloon assembly and the annular electrode are both disposed. In this embodiment, by setting the distal end of the tube body 100 as an adjustable bend 110, it is more convenient for the operator to control the degree of curvature of the balloon ablation catheter, so that the balloon ablation catheter can pass through the blood vessel more smoothly and reach the lesion tissue more quickly.
[0075] Specifically, see Figure 5 and Figure 6 The catheter body 100 contains a guidewire channel 140. The guidewire passes through the guidewire channel 140 to guide the adjustable bending segment 110 to bend, assisting the balloon ablation catheter in passing through blood vessels to reach the lesion tissue. Alternatively, a ring electrode can be placed at the distal end of the catheter body 100, replacing the original distal end fixation member 170. The balloon assembly is then placed at the proximal end of the ring electrode. In this case, the guidewire channel 140 can be eliminated, and a pull wire structure can be installed at the distal end of the catheter body 100. The operator can achieve the bending function of the balloon ablation catheter by pulling the pull wire structure.
[0076] Of course, the ablation electrode 300 is not limited to a ring electrode of a certain length; see [reference needed]. Figures 1 to 4 and Figures 7 to 8In one example embodiment, the ablation electrode 300 includes a boss-shaped electrode with a plurality of infusion holes 310 on its surface to achieve circumferential infusion of the ablation electrode 300. In this case, an independent infusion channel 150 should be opened within the tube 100, connecting to the infusion holes 310 on the boss-shaped electrode, so as to infuse saline solution into the infusion holes 310. Simultaneously, to ensure the continuity of the infusion channel 150, the balloon assembly is preferably located at the distal end of the boss-shaped electrode, and the connection between the tube 100 and the balloon 200 needs to be sealed to prevent leakage of saline solution.
[0077] In this embodiment, see Figures 7 to 9 The balloon assembly preferably adopts an embedded structure, which can provide more arrangement options for the balloon assembly and ablation electrode 300, while taking into account both the perfusion function of the ablation electrode 300 and the more precise contact and fine-tuning function of the balloon 200.
[0078] Correspondingly, the distal end of the tube body 100 in this embodiment also has an adjustable bend section 110, on which the balloon assembly and the boss-shaped electrode are both disposed. Specifically, the tube body 100 is provided with a guidewire channel 140, through which the guidewire passes to guide the adjustable bend section 110 to bend, assisting the balloon ablation catheter to pass through the blood vessel and reach the lesion tissue. Of course, in actual production, a pull wire structure can also be additionally provided on the distal end fixation member 170 of the tube body, allowing the operator to achieve the bend adjustment function of the balloon ablation catheter by pulling the pull wire structure. This is not limited here and is within the scope of protection of this application.
[0079] In one specific embodiment, the balloon ablation catheter also includes a pressure sensor located on or around the balloon assembly to monitor the contact pressure of the ablation electrode 300. This allows the operator to control the contact of the ablation electrode 300 with the tissue by adjusting the inflation level of the balloon 200, ensuring effective contact while avoiding vascular perforation caused by over-inflation of the balloon 200, thus guaranteeing the safety of the procedure.
[0080] Specifically, the pressure sensor can be located in the axial region between the ablation electrode 300 and the balloon assembly, or at the center of the surface of the balloon 200 in the balloon assembly.
[0081] This application also provides a balloon ablation system 200, including a balloon ablation catheter and a control handle disposed at the proximal end of the balloon ablation catheter. The balloon ablation catheter is the balloon ablation catheter provided in any of the above embodiments.
[0082] Specifically, the control handle is equipped with a connector, which is a Luer connector, to connect to the tubing on the saline or compressed air peristaltic pump, allowing fluid to enter the expansion channel 120. The control handle is also equipped with control keys, each corresponding to one of the expansion channels 120. Below each control key is a pressing element, which can independently control the opening and closing of the corresponding expansion channel 120.
[0083] Specifically, when the operator presses down the control button, the button causes the corresponding squeezing element to compress the inflation channel 120, isolating the inflation channel 120 from the external tubing (i.e., the tubing on the saline or compressed air peristaltic pump). This seals the fluid already injected into the inflation channel 120 and balloon 200 within them, maintaining the balloon 200's current inflation state. When the operator lifts the control button, the squeezing element disengages from the inflation channel 120, connecting the inflation channel 120 to the external tubing. Fluid can then enter and exit the inflation channel 120 and balloon 200, allowing the operator to adjust the balloon 200's inflation level or deflate it.
[0084] See Figure 2In actual use, the balloon ablation catheter enters the body through the puncture sheath. With the balloon 200 set to inflate with air or carbon dioxide, after the catheter enters the body, the control handle can be adjusted to ensure all balloons 200 at the distal end of the catheter are inflated. At this time, the balloons 200 can flow with the blood flow, moving from the puncture point along the abdominal aorta to near the renal artery orifice. The operator adjusts the guidewire or pull wire structure to allow the ablation electrode 300 or the distal balloon 200 at the distal end of the catheter to enter the renal artery first. Based on the renal artery diameter, all balloons 200 are simultaneously deflated (deflation and inflation require an external air supply device) to ensure that the outer diameter of the balloons 200 does not obstruct the movement of the balloon ablation catheter within the renal artery. Because a certain amount of low-density gas remains inside the balloons 200 after appropriate deflation, the balloon ablation catheter can still utilize blood flow, reducing the resistance encountered during its movement within the renal artery. When the ablation electrode 300 reaches the ablation point, all the gas in the balloons 200 can be completely released. This allows for overinflation of a single balloon 200 or sequential overinflation of two balloons 200 until the inflated balloons 200 are in contact with the vessel wall. This ensures sufficient contact between the ablation electrode 300 on the side without inflated balloons 200 and the tissue to be ablated, facilitating ablation treatment. Thanks to the independently controlled inflation settings of the balloons 200, the operator can adjust the balloon state to achieve circumferential ablation without twisting the balloon ablation catheter, improving surgical efficiency. When a pressure sensor is installed at the distal end of the catheter 100, the contact pressure can be monitored in real time, ensuring effective contact while avoiding vascular perforation caused by overinflation of the balloons 200, thus guaranteeing surgical safety. After circumferential ablation is completed, the balloons 200 can be completely deflated, allowing the operator to easily withdraw the balloon ablation catheter for treatment at the next point.
[0085] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.
[0086] It should be noted that the above embodiments can be freely combined as needed. The above are merely preferred embodiments of this application. It should be pointed out that for those skilled in the art, several improvements and modifications can be made without departing from the principles of this application, and these improvements and modifications should also be considered within the scope of protection of this application.
Claims
1. A balloon ablation catheter, characterized by, include: The tube body, the balloon assembly located at the distal end of the tube body, and the ablation electrode; The balloon assembly includes at least two balloons, and the at least two balloons are distributed sequentially along the circumference of the tube; the tube has inflation channels corresponding to the balloons one by one, which are suitable for external fluid to enter and exit the balloons; The ablation electrode is arranged circumferentially around the side wall of the tube; when part of the balloon is filled with fluid, the ablation electrode located on the opposite side of the fluid-filled balloon is adapted to abut against the tissue to be ablated.
2. The balloon ablation catheter according to claim 1, characterized in that, The distal end of the tube is provided with a groove, which is arranged around the side wall of the tube, and the balloon assembly is disposed in the groove.
3. The balloon ablation catheter according to claim 1, characterized in that, The distal sidewall of the tube has several openings, and the inner sidewall of the tube has a thin film covering the openings at the openings, the thin film forming the balloon. When fluid enters the balloon through the inflation channel, the balloon is extruded from the opening.
4. The balloon ablation catheter according to any one of claims 1-3, characterized in that, The ablation electrode is located at the distal end of the balloon; or, the ablation electrode is located at the proximal end of the balloon; or, the number of balloon assemblies is at least two, arranged sequentially along the axial direction of the tube, and the ablation electrode is located between two adjacent balloon assemblies.
5. The balloon ablation catheter according to claim 4, characterized in that, The ablation electrode includes a ring electrode nested within the tube body; The annular electrode is electrically connected to the control handle via a discharge wire; and / or, a thermocouple is provided on the inner wall of the annular electrode for monitoring the tissue temperature during the ablation process.
6. The balloon ablation catheter according to claim 5, characterized in that, The distal end of the tube has an adjustable bend, and the balloon assembly and the annular electrode are both located in the adjustable bend. The tube body is provided with a guide wire channel, through which the guide wire passes to guide the adjustable bending section to bend; or, the annular electrode is located at the distal end of the tube body, and the distal end of the tube body is also provided with a pull wire structure, through which the adjustable bending section is bent.
7. The balloon ablation catheter according to claim 4, characterized in that, The ablation electrode includes a boss-shaped electrode located at the proximal end of the balloon assembly; The boss-shaped electrode is provided with a plurality of injection holes, and an injection channel communicating with the injection holes is opened in the tube body.
8. The balloon ablation catheter according to claim 7, characterized in that, The distal end of the tube has an adjustable bend, and the balloon assembly and the boss-shaped electrode are both located in the adjustable bend; wherein, the tube is provided with a guide wire channel, and the guide wire passes through the guide wire channel to guide the adjustable bend to bend.
9. The balloon ablation catheter of any of claims 1-3, wherein, Also includes: A pressure sensor, located on or around the balloon assembly, is used to monitor the contact pressure of the ablation electrode.
10. A balloon ablation system, characterized by, include: A balloon ablation catheter and a control handle located at the proximal end of the balloon ablation catheter; The balloon ablation catheter is the balloon ablation catheter according to any one of claims 1-9. The control handle is provided with a connector for connecting to an external pipeline to allow fluid to enter the inflation channel. The control handle is also provided with a control key, which corresponds one-to-one with the inflation channel. Furthermore, a squeezing element is provided below the control key. When the control key is pressed down, the extruder squeezes the expansion channel, and the expansion channel is isolated from the external pipeline; when the control key is lifted up, the extruder disengages from the expansion channel, and the expansion channel is connected to the external pipeline.