Double-balloon catheter and balloon catheter system

Abstract

The utility model provides a double-balloon catheter and a balloon catheter system. The double-balloon catheter comprises a catheter body, a first balloon and a second balloon, wherein the first balloon and the second balloon are arranged on the catheter body; the first balloon is closer to the far end of the catheter body than the second balloon, and the diameter of the section of the first balloon is smaller than that of the section of the second balloon; the catheter body comprises a first conveying cavity, a second conveying cavity and a third conveying cavity, the first conveying cavity is communicated with an inner cavity of the first balloon, the second conveying cavity is communicated with an inner cavity of the second balloon, and an output port of the third conveying cavity is located at the far end of the catheter body. The balloon is designed to be of a large-small double-balloon structure, blood vessels with different thicknesses can be blocked, and the sealing performance and safety of balloon attachment are better.

Description

Technical Field

[0001] The utility model relates to the field of medical instruments, in particular to a double-balloon catheter and a balloon catheter system. Background Art

[0002] In the field of electrophysiology, using electrophysiology catheters to transmit energy for tissue ablation is a common treatment method. In some areas where electrophysiology catheters are difficult to ablate (such as the ends of coronary veins or coronary artery branches), chemical ablation is a better choice. Chemical ablation is to fully contact the chemical medium with the target tissue, allowing the chemical medium to penetrate into the target tissue and cause tissue necrosis, thereby achieving the effect of ablation.

[0003] Studies have reported that combining chemical ablation of Marshall vein with catheter ablation can improve the success rate of treatment of persistent atrial fibrillation. The surgical steps are roughly as follows: first, use a guidewire to find the Marshall vein under X-ray imaging, and then insert an OTW balloon of appropriate size along the guidewire. After the balloon is in place, contrast agent is injected into the balloon to expand the balloon to block the proximal end of the Marshall vein. Then, a certain volume of anhydrous ethanol is injected into the Marshall vein from the guidewire cavity of the balloon to allow the anhydrous ethanol to fully penetrate and diffuse into the tissue near the Marshall vein. After the ablation is completed, an ultra-fine mapping electrode can be used to map the electrical signal in the Marshall vein to confirm the ablation effect. The OTW balloon used for chemical ablation of the Marshall vein generally uses a coronary artery expansion balloon, and the mapping electrode is a 1.5F ultra-fine mapping electrode. The surgical instrument is a non-special instrument and the operation is complicated. In addition, the injection of anhydrous ethanol requires the doctor's experience, and the safety needs to be improved. The industry needs a balloon catheter solution that can more easily and safely achieve blood vessel adhesion. Utility Model Content

[0004] The utility model aims to provide a double-balloon catheter and a balloon catheter system, wherein the balloon is designed into a double-balloon structure with one large and one small, so that blood vessels of different thicknesses can be blocked, and the balloon has better sealing and safety.

[0005] In order to solve the above technical problems, the utility model provides a double-balloon catheter, comprising a catheter body and a first balloon and a second balloon arranged on the catheter body;

[0006] The first balloon is closer to the distal end of the catheter body than the second balloon, and the cross-sectional diameter of the first balloon is smaller than the cross-sectional diameter of the second balloon;

[0007] The catheter body includes a first delivery lumen, a second delivery lumen and a third delivery lumen, the first delivery lumen is communicated with the inner lumen of the first balloon, the second delivery lumen is communicated with the inner lumen of the second balloon, and the output port of the third delivery lumen is located at the distal end of the catheter body.

[0008] Optionally, the ratio of the cross-sectional diameters of the second balloon to the first balloon is greater than 1 and less than or equal to 20.

[0009] Optionally, the first balloon is made of a compliant material or a semi-compliant material.

[0010] Optionally, it also includes a tip tube segment, which is arranged at the distal end of the double-balloon catheter, the inner cavity of the tip tube segment is connected to the output port of the third delivery cavity, and in an initial state, the tip tube segment is arranged at an angle to the axial direction of the catheter body.

[0011] Optionally, in an initial state, relative to the axial direction of the catheter body, a minimum bending radius of the tip tube segment is 3 mm, and / or a bending angle range of the tip tube segment is greater than 0° and not greater than 90°.

[0012] Optionally, the second balloon and the first balloon are spaced apart so that the first balloon and the second balloon can be located in different blood vessels at the same time.

[0013] Optionally, the interval distance between the second balloon and the first balloon ranges from 15 to 25 mm.

[0014] Optionally, the catheter body includes an inner catheter and an outer catheter, the outer catheter is sleeved on the inner catheter and the inner catheter penetrates the outer catheter along the axial direction of the outer catheter, the first balloon is arranged on the inner catheter, and the second balloon is arranged on the outer catheter.

[0015] Optionally, the proximal end of the inner catheter is connected to the second catheter seat, and the proximal end of the outer catheter is connected to the third catheter seat; the second catheter seat is provided with a second input interface and a third input interface, the second input interface is connected to the first delivery cavity, and the third input interface is connected to the third delivery cavity; the third catheter seat is provided with a fourth input interface, and the fourth input interface is connected to the second delivery cavity.

[0016] Optionally, the inner catheter is detachably connected to the outer catheter.

[0017] Optionally, the cross-sectional diameter of the first balloon ranges from 1 to 5 mm, and the cross-sectional diameter of the second balloon ranges from 5 to 20 mm.

[0018] Optionally, the cross-sectional diameter of the second balloon ranges from 8 to 12 mm, and the cross-sectional diameter of the first balloon ranges from 1.5 to 3.5 mm, and the double-balloon catheter can be used for chemical ablation treatment of Marshall vein.

[0019] The utility model also provides a balloon catheter system, the system comprising any one of the above-mentioned double balloon catheters and a mapping electrode, wherein the mapping electrode can pass through the third delivery cavity.

[0020] Optionally, the mapping electrode includes a passage for passing a guide wire and / or an ablative agent.

[0021] The double balloon catheter and balloon catheter system provided by the utility model have the following beneficial effects:

[0022] The utility model provides a double-balloon catheter, comprising a catheter body and a first balloon and a second balloon arranged on the catheter body; the first balloon is closer to the distal end of the catheter body than the second balloon, and the cross-sectional diameter of the first balloon is smaller than the cross-sectional diameter of the second balloon; the catheter body comprises a first delivery cavity, a second delivery cavity and a third delivery cavity, the first delivery cavity is connected to the inner cavity of the first balloon, the second delivery cavity is connected to the inner cavity of the second balloon, and the output port of the third delivery cavity is located at the distal end of the catheter body. When the double-balloon catheter is used, the second balloon can fit the wall of the blood vessel and block the blood vessel after being filled, and the first balloon can block the terminal small blood vessels after being filled. Thereby, blood vessels of different thicknesses can be blocked, and the balloon fit has better sealing and safety. While increasing the efficiency of the operation, the safety of the operation is improved.

[0023] The utility model also provides a balloon catheter system. Since the balloon catheter system includes the double balloon catheter, when the balloon catheter system is used, the second balloon can fit the blood vessel wall and block the blood vessel after being filled, and the first balloon can block the terminal small blood vessels after being filled. Thus, blood vessels of different thicknesses can be blocked, and the balloon fit has better sealing and safety. While increasing the efficiency of the operation, the safety of the operation is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a side view of a double-balloon catheter provided in the first embodiment of the utility model.

[0025] Figure 2 This is a side view of the mapping electrode provided in the first embodiment of the utility model applied to a double balloon catheter.

[0026] Figure 3This is a schematic diagram of an embodiment of the utility model in which a tip section is arranged at the distal end of a double-balloon catheter.

[0027] Figure 4 A side view of a double-balloon catheter provided in accordance with a second embodiment of the present invention.

[0028] Figure 5 A side view of a mapping electrode provided in the second embodiment of the utility model applied to a double-balloon catheter.

[0029] Figure 6 A side view of the inner catheter of a double-balloon catheter provided in one embodiment of the utility model.

[0030] Figure 7 A side view of the outer catheter of a double-balloon catheter provided in one embodiment of the utility model.

[0031] The accompanying drawings are numbered as follows:

[0032] 1-catheter body; 11-inner catheter; 12-outer catheter;

[0033] 21-first balloon; 22-second balloon;

[0034] 31- tip tube segment; 32- output port of the third delivery cavity; ɑ- angle between the tip segment 31 and the axis of the catheter body 1

[0035] 41 - first conduit seat; 411 - first input interface; 412 - first stress diffusion tube;

[0036] 42 - second conduit seat; 421 - second input interface; 422 - third input interface; 423 - second stress diffusion tube;

[0037] 43 - third conduit seat; 431 - third input interface; 432 - third stress diffusion tube;

[0038] 51-first developing ring; 52-second developing ring;

[0039] 61-mapping electrodes. DETAILED DESCRIPTION

[0040] In order to make the purpose, advantages and features of the utility model clearer, the utility model is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the drawings are all in a very simplified form and are not drawn to scale, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the utility model. In addition, the structure shown in the drawings is often a part of the actual structure. In particular, the emphasis of each drawing is different, and sometimes different scales are used.

[0041] It should be understood that when an element or layer is referred to as "on...", "connected to" other elements or layers, it can be directly on other elements or layers, connected to other elements or layers, or can include intervening elements or layers. On the contrary, when an element is referred to as "directly on...", "directly connected to" other elements or layers, intervening elements or layers are not included. Although the terms first, second, third, etc. can be used to describe various elements, components, regions, layers and / or parts, these elements, components, regions, layers and / or parts should not be limited by these terms. These terms are only used to distinguish an element, component, region, layer or part from another element, component, region, layer or part. Therefore, without departing from the teaching of the present invention, the first element, component, region, layer or part discussed below can be expressed as a second element, component, region, layer or part. Spatial relationship terms such as "under...", "below", "below", "above...", "above", "above", etc., can be used here for the convenience of description to describe the relationship between an element or feature shown in the figure and other elements or features. It should be understood that, in addition to the orientation shown in the figure, the spatial relationship terms are intended to include different orientations of the devices in use and operation. For example, if the device in the accompanying drawings is turned over, then, the elements or features described as "under...", "below", "below" will be oriented to be "on" other elements or features. The device can be oriented in other ways (rotated 90 degrees or other orientations) and the spatial descriptors used here are interpreted accordingly. The purpose of the terms used here is only to describe specific embodiments and is not intended to be a limitation of the utility model. When used here, the singular forms of "one", "one" and "said / the" are also intended to include plural forms, unless the context clearly indicates another way. It should also be understood that the term "include" is used to determine the inclusion of features, steps, operations, elements and / or parts, but does not exclude the inclusion or addition of one or more other features, steps, operations, elements, parts and / or groups. When used here, the term "and / or" includes any and all combinations of the relevant listed items.

[0042] The definitions of "proximal" and "distal" in this article are: "proximal" generally refers to the proximal end of the medical device close to the operator during normal operation, while "distal" generally refers to the proximal end of the medical device that first enters the patient's body during normal operation.

[0043] The utility model aims to provide a double-balloon catheter, which designs the balloon into a double-balloon structure with one large and one small balloon, and can block blood vessels of different thicknesses, especially suitable for Marshall veins, and has better sealing and safety of balloon adhesion.

[0044] Please refer to Figure 1 , Figure 1 This is a side view of a double balloon catheter provided in the first embodiment of the utility model. Figure 1 As shown, in order to solve the above technical problems, the utility model provides a double-balloon catheter, including a catheter body 1 and a first balloon 21 and a second balloon 22 arranged on the catheter body 1; the first balloon 21 is closer to the distal end of the catheter body 1 than the second balloon 22, and the cross-sectional diameter of the first balloon 21 is smaller than the cross-sectional diameter of the second balloon 22; the catheter body 1 includes a first delivery cavity, a second delivery cavity and a third delivery cavity (not shown in the figure), the first delivery cavity is connected to the inner cavity of the first balloon 21, the second delivery cavity is connected to the inner cavity of the second balloon 22, and the output port 32 of the third delivery cavity is located at the distal end of the catheter body 1.

[0045] When using the utility model, the second delivery cavity is used to deliver the filling medium so that the second balloon 22 can fit the blood vessel wall and block the blood vessel after being filled, the first delivery cavity is used to deliver the filling medium so that the first balloon 21 can block the terminal small blood vessels after being filled, and the third delivery cavity is used to deliver the chemical ablative agent. Thus, the utility model uses two balloons of different sizes to block blood vessels of different thicknesses, and the balloon fit has better sealing and safety. The utility model can improve the safety of surgery while increasing the efficiency of surgery. In an exemplary embodiment, the second balloon 22 and the first balloon 21 are spaced apart so that the first balloon and the second balloon can be located in different blood vessels at the same time, with a spacing of 3 to 50 mm, preferably 15 to 25 mm. This arrangement is convenient for manufacturing the balloon, and when the target tissue for ablation is determined by the second balloon 22, it can prevent the first balloon 21 from crossing the target tissue, causing complexity in the operation; the cross-sectional diameter of the second balloon 22 is greater than the cross-sectional diameter of the first balloon 21, and the cross-sectional diameter of the second balloon 22 is 5 to 20 mm, preferably 8 to 12 mm; the cross-sectional diameter of the first balloon 21 is 1 to 5 mm, preferably 1.5 to 3.5 mm; the cross-sectional diameter ratio of the second balloon 22 to the first balloon 21 is greater than 1, less than or equal to 20, preferably 2 to 8. With this arrangement, the utility model will be particularly suitable for Marshall vein. The above specific data are only for display of preferred embodiments and are not limited thereto.

[0046] It should be understood that the first delivery lumen, the second delivery lumen and the third delivery lumen should not be interconnected, and the implementation methods of the first delivery lumen, the second delivery lumen and the third delivery lumen include but are not limited to the catheter body 1 comprising a three-lumen tube. The third delivery lumen is used to deliver chemical ablative agents, and can also be used to pass through guidewires and mapping electrodes. There are two specifications of mapping electrodes, divided into those with and without passages. The passage in the middle of the mapping electrode with a passage can pass a guidewire and inject ablative agents, while the mapping electrode without a passage does not have this function. The state of the mapping electrode applied to the double-balloon catheter can be referred to. Figure 2 The mapping electrode 61 in Figure 2 This is a side view of the mapping electrode 61 provided in the first embodiment of the utility model applied to a double-balloon catheter.

[0047] It should be understood that in order to enable the first balloon 21 to fit the blood vessels in different situations, the material of the first balloon 21 is a compliant material or a semi-compliant material. Specifically, the material of the second balloon 22 and the first balloon 21 can be selected from polymer materials such as nylon (PA), polyether block polyamide (pebax), polyurethane (PU), etc., but is not limited thereto.

[0048] Please refer to Figures 1 to 3 , Figure 3 This is a schematic diagram of an embodiment of the utility model in which the tip section is arranged at the distal end of a double balloon catheter. Figure 3 As shown, further, the double-balloon catheter also includes a tip tube segment 31, which is arranged at the distal end of the double-balloon catheter, and the inner cavity of the tip tube segment 31 is connected to the output port 32 of the third delivery cavity. In the initial state, the tip tube segment 31 is arranged at an angle to the axial direction of the catheter body 1 (see Figure 3 Specifically, in the initial state, the angle ɑ between the tip segment 31 and the axis of the catheter body 1 is greater than 0° and not greater than 90°. It should be understood that the initial state includes the natural state of the finished product of the utility model, and in the working state, the tip segment 31 will be deformed to a certain extent due to contact with the target tissue. The distal end of the tip segment 31 is provided with a rounded corner to prevent scratches. The material of the tip segment 31 can be a flexible material to achieve flexible bending. The flexibility of the material of the tip segment is greater than the flexibility of the catheter body 1. In an exemplary embodiment, in the initial state, the tip segment can be bent, specifically, it can be flexibly bent at a certain angle, with a minimum bending radius of 3mm. The bending angle of the tip segment can ensure that the catheter head end can more conveniently enter the branch blood vessel, and can be composed of soft polymer materials, such as polyether block polyamide (pebax), etc., but is not limited to this.

[0049] Please continue to refer to Figure 1 and Figure 2Preferably, the proximal end of the catheter body 1 is connected to the first catheter seat 41, and the first catheter seat 41 is provided with a plurality of first input interfaces 411, and the first input interfaces 411 are respectively connected to the first delivery cavity, the second delivery cavity and the third delivery cavity in a one-to-one correspondence, and the material of the first catheter seat can be selected from polymer materials, such as polycarbonate (PC), but not limited thereto. A first stress diffusion tube 412 is provided at the connection between the catheter body 1 and the first catheter seat, and the first stress diffusion tube 412 is used to prevent the catheter body 1 from bending and damage due to stress concentration.

[0050] Please continue to refer to Figure 1 and Figure 2 A first developing ring 51 may be provided on the first balloon 21, and a second developing ring 52 may be provided on the second balloon 22, so as to enable developing and positioning under X-ray irradiation. The materials of the first developing ring 51 and the second developing ring 52 may be selected from metal materials such as platinum-iridium alloy.

[0051] Please refer to Figure 4 , Figure 4 A side view of a double balloon catheter provided in the second embodiment of the utility model. Figure 4 As shown, the difference between the second embodiment and the first embodiment is that the catheter body 1 in the second embodiment includes an inner catheter 11 and an outer catheter 12, the outer catheter 12 is sleeved on the inner catheter 11 and the inner catheter 11 penetrates the outer catheter 12 axially along the outer catheter 12, the first balloon 21 is arranged on the inner catheter 11, and the second balloon 22 is arranged on the outer catheter 12. The inner catheter 11 and the outer catheter 12 are detachably connected and can be used in combination when used. During the disassembly or assembly process, the first balloon 21 should be contracted first to pass through the outer catheter 12 to achieve disassembly and assembly. The outer catheter 12 can first enter the blood vessel, and then guide the inner catheter 11 to enter, so as to first block the thicker blood vessels, and then further block the thinner blood vessels, so that the surgical operation is more flexible. The specific state of the two after disassembly can refer to Figure 6 and Figure 7 , Figure 6 This is a side view of the inner catheter 11 of the double-balloon catheter provided in one embodiment of the utility model. Figure 7A side view of the outer catheter 12 of the double balloon catheter provided in one embodiment of the utility model. In this scenario, the distal end of the outer catheter 12 may also be tapered, and the port has rounded corners to prevent scratching of the blood vessels. Preferably, the tip tube segment 31 is arranged at the distal end of the inner catheter 11. Preferably, the flexibility of the material of the distal end of the inner catheter 11 is greater than the flexibility of the material of the remaining part of the outer catheter 12, and the flexible bending angle is 0 to 90°, the minimum bending radius is 3mm, and soft polymer materials such as polyether block polyamide (pebax) can be selected, but it is not limited to this. Similar to the first embodiment, the third delivery cavity is used to deliver chemical ablative agents, and can also be used to pass guidewires and mapping electrodes. There are two specifications of mapping electrodes, divided into those with and without passages. The passage in the middle of the mapping electrode with a passage can pass the guidewire and inject the ablative agent, and the mapping electrode without a passage does not have this function. The state of the mapping electrode applied to the double balloon catheter can refer to Figure 5 The standard side electrode 61, Figure 5 This is a side view of the mapping electrode 61 provided in the second embodiment of the present invention applied to a double-balloon catheter.

[0052] Please continue to refer to Figures 4 to 7 ,like Figures 4 to 7 As shown, preferably, the proximal end of the inner catheter 11 is connected to the second catheter seat 42, and the proximal end of the outer catheter 12 is connected to the third catheter seat 43; the second catheter seat 42 is provided with a second input interface 421 and a third input interface 422, the second input interface 421 is connected to the first delivery cavity, and the third input interface 422 is connected to the third delivery cavity; the third catheter seat 43 is provided with a fourth input interface, and the fourth input interface is connected to the second delivery cavity. Specifically, the second delivery cavity can be formed by the gap between the inner wall of the outer catheter 12 and the outer wall of the inner catheter 11, and the inner catheter 11 may include a double-lumen tube, having the first delivery cavity and the third delivery cavity. Similarly, the materials of the second catheter seat 42 and the third catheter seat 43 can be selected from polymer materials, such as polycarbonate (PC).

[0053] Please continue to refer to Figures 4 to 7 ,like Figures 4 to 7 As shown, preferably, a second stress diffusion tube 423 is provided at the connection between the inner conduit 11 and the second conduit seat 42, and a third stress diffusion tube 432 is provided at the connection between the outer conduit 12 and the third conduit seat. The functions of the second stress diffusion tube 423 and the third stress diffusion tube 432 are similar to those of the first stress diffusion tube 412. The second stress diffusion tube 423 is used to prevent the inner conduit 11 from bending and damage due to stress concentration, and the third stress diffusion tube 432 is used to prevent the outer conduit 12 from bending and damage due to stress concentration.

[0054] The utility model also provides a balloon catheter system, the system comprising any one of the above-mentioned double balloon catheters and a mapping electrode, wherein the mapping electrode can pass through the third delivery cavity.

[0055] Since the balloon catheter system includes the double-balloon catheter, when the balloon catheter system is used, the second balloon can fit the blood vessel wall and block the blood vessel after being filled, and the first balloon can block the terminal small blood vessels after being filled. Thus, blood vessels of different thicknesses can be blocked, and the balloon fit has better sealing and safety. While increasing the efficiency of the operation, the safety of the operation is improved.

[0056] Furthermore, the mapping electrode includes a passage for passing a guide wire and / or an ablative agent.

[0057] The following is an explanation of the technical principle of the present invention in conjunction with a specific example of the method of use of the present invention:

[0058] Example 1 (the method of use of this example corresponds to the double-balloon catheter provided by the first example of the utility model):

[0059] Step 1: The sheath is passed through the wound to establish a channel;

[0060] Step 2: The double-balloon catheter is passed through the sheath lumen under the guidance of the guidewire to reach the coronary sinus;

[0061] Step 3: injecting contrast medium to fill the second balloon 22 and block the coronary sinus;

[0062] Step 4: withdrawing the guidewire from the guidewire lumen (the guidewire lumen may be the third delivery lumen), and injecting contrast agent through the guidewire lumen to visualize the coronary venous system to determine the target blood vessel;

[0063] Step 5: When the development result is a target vessel, the contrast agent in the second balloon 22 is extracted to shrink the balloon and move the double-balloon catheter; when the development result is a non-target vessel, the contrast agent in the second balloon 22 is extracted to adjust the position of the double-balloon catheter and then the contrast agent is injected through the guidewire cavity to develop the coronary venous system to determine the target vessel, until the final development result is the target vessel and the contrast agent in the second balloon 22 is extracted to shrink the balloon and move the double-balloon catheter.

[0064] Step 6: inserting the guidewire into the guidewire cavity, and under the guidance of the guidewire, the tip tube segment 31 and the first balloon 21 enter the target blood vessel, and injecting contrast agent to fill the first balloon 21 and block the target blood vessel, and the second balloon 22 fills and blocks the coronary sinus;

[0065] Step 7: Withdraw the guidewire from the guidewire cavity, allow the mapping electrode to enter the guidewire cavity, and use the mapping electrode to measure the target vascular electrical signal. There are two specifications of mapping electrodes, with and without a pathway. The pathway in the middle of the mapping electrode with a pathway can pass the guidewire and inject ablative agents, while the mapping electrode without a pathway does not have this function;

[0066] Step 8: When a mapping electrode without a passage is used, the mapping electrode is withdrawn from the guidewire cavity, and the ablative agent is injected into the target blood vessel through the third delivery cavity; when a mapping electrode with a passage is used, the ablative agent can be directly injected through the passage of the mapping electrode without withdrawing the mapping electrode;

[0067] Step 9: When using a mapping electrode without a pathway, pass the mapping electrode through the guidewire lumen into the target blood vessel to measure the electrical signal and observe the ablation effect; when using a mapping electrode with a pathway, directly measure the electrical signal and observe the ablation effect.

[0068] Example 2 (the method of use of this example corresponds to the double-balloon catheter provided by the second example of the utility model):

[0069] Step 1: The sheath is passed through the wound to establish a channel;

[0070] Step 2: The outer catheter 12 passes through the inner cavity of the sheath under the guidance of the guide wire and reaches the coronary sinus;

[0071] Step 3: injecting contrast medium to fill the second balloon 22 and block the coronary sinus;

[0072] Step 4: withdrawing the guidewire from the guidewire lumen of the outer catheter 12, and injecting contrast agent through the guidewire lumen to visualize the coronary venous system to determine the target blood vessel;

[0073] Step 5: When the development result is a target vessel, the guidewire is cooperated with the inner catheter 11 to pass through the outer catheter 12 axially along the outer catheter 12, and under the guidance of the guidewire, the tip tube segment 31 and the first balloon 21 enter the target vessel, and the contrast agent is injected to fill the first balloon 21 and block the target vessel; when the development result is a non-target vessel, the contrast agent in the second balloon 22 is extracted to adjust the position of the outer catheter and then the contrast agent is injected through the guidewire cavity to develop the coronary venous system to determine the target vessel, until the final development result is the target vessel, and the guidewire is cooperated with the inner catheter 11 to pass through the outer catheter 12 axially along the outer catheter 12, and under the guidance of the guidewire, the tip tube segment 31 and the first balloon 21 enter the target venous vessel, and the contrast agent is injected to fill the first balloon 21 and block the target vessel.

[0074] Step 6: withdraw the guidewire from the guidewire lumen of the inner catheter 11 (which may be the third delivery lumen), allow the mapping electrode to enter the guidewire lumen of the inner catheter 11, and use the mapping electrode to measure the target blood vessel electrical signal. There are two specifications of mapping electrodes, with and without a passage. The passage in the middle of the mapping electrode with a passage can pass the guidewire and inject the ablative agent, while the mapping electrode without a passage does not have this function;

[0075] Step 7: When a mapping electrode without a passage is used, the mapping electrode is withdrawn from the guidewire cavity of the inner catheter 11, and an ablative agent is injected into the target blood vessel through the guidewire cavity of the inner catheter 11; when a mapping electrode with a passage is used, an ablative agent can be directly injected through the passage of the mapping electrode without withdrawing the mapping electrode;

[0076] Step 8: When using a mapping electrode without a passage, allow the mapping electrode to enter the target blood vessel through the guidewire cavity of the inner catheter 11 to measure the electrical signal and observe the ablation effect; when using a mapping electrode with a passage, the electrical signal can be directly measured through the mapping electrode to observe the ablation effect.

[0077] It should also be noted that, although the present invention has been disclosed as a preferred embodiment, the above embodiment is not intended to limit the present invention. For any technician familiar with the art, without departing from the scope of the technical solution of the present invention, the above disclosed technical content can be used to make many possible changes and modifications to the technical solution of the present invention, or modified into equivalent embodiments of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of protection of the technical solution of the present invention.

[0078] It should also be understood that, unless otherwise specified or indicated, the terms "first", "second", "third", etc. in the specification are merely used to distinguish between the various components, elements, steps, etc. in the specification, and are not used to indicate the logical relationship or sequential relationship between the various components, elements, steps, etc.

[0079] It should also be recognized that the terms described herein are only used to describe specific embodiments and are not used to limit the scope of the utility model. It must be noted that the singular forms "one" and "a kind" used herein and in the appended claims include plural references unless the context clearly indicates the opposite meaning. For example, a reference to "a step" or "a device" means a reference to one or more steps or devices, and may include secondary steps and secondary devices. All conjunctions used should be understood in the broadest sense. And, the word "or" should be understood to have the definition of a logical "or", not a logical "exclusive or" definition, unless the context clearly indicates the opposite meaning. In addition, the implementation of the embodiments of the utility model may include performing the selected tasks manually, automatically, or in combination.

Claims

1. A double-balloon catheter capable of being used for chemical ablation, characterized in that: It comprises a catheter body and a first balloon and a second balloon arranged on the catheter body; The first balloon is closer to the distal end of the catheter body than the second balloon, and the cross-sectional diameter of the first balloon is smaller than the cross-sectional diameter of the second balloon; The catheter body includes a first delivery lumen, a second delivery lumen and a third delivery lumen, the first delivery lumen is communicated with the inner lumen of the first balloon, the second delivery lumen is communicated with the inner lumen of the second balloon, and the output port of the third delivery lumen is located at the distal end of the catheter body.

2. The double balloon catheter according to claim 1, characterized in that: The ratio of the cross-sectional diameters of the second balloon to the first balloon is greater than 1 and less than or equal to 20.

3. The double balloon catheter according to claim 1, characterized in that: The first balloon is made of a compliant material or a semi-compliant material.

4. The double balloon catheter according to any one of claims 1 to 3, characterized in that: It also includes a tip tube segment, which is arranged at the distal end of the double-balloon catheter. The inner cavity of the tip tube segment is connected to the output port of the third delivery cavity. In an initial state, the tip tube segment is arranged at an angle to the axial direction of the catheter body.

5. The double balloon catheter according to claim 4, characterized in that: In an initial state, relative to the axial direction of the catheter body, the minimum bending radius of the tip tube segment is 3 mm, and / or the bending angle range of the tip tube segment is greater than 0° and not greater than 90°.

6. The double balloon catheter according to any one of claims 1 to 3 and 5, characterized in that: The second balloon and the first balloon are spaced apart so that the first balloon and the second balloon can be located in different blood vessels at the same time.

7. The double balloon catheter according to claim 6, characterized in that: The interval distance between the second balloon and the first balloon ranges from 15 to 25 mm.

8. The double balloon catheter according to any one of claims 1-3, 5 and 7, characterized in that: The catheter body comprises an inner catheter and an outer catheter, the outer catheter is sleeved on the inner catheter and the inner catheter penetrates the outer catheter along the axial direction of the outer catheter, the first balloon is arranged on the inner catheter, and the second balloon is arranged on the outer catheter.

9. The double balloon catheter according to claim 8, characterized in that: The proximal end of the inner catheter is connected to the second catheter seat, and the proximal end of the outer catheter is connected to the third catheter seat; The second catheter seat is provided with a second input interface and a third input interface, the second input interface is communicated with the first delivery cavity, and the third input interface is communicated with the third delivery cavity; the third catheter seat is provided with a fourth input interface, and the fourth input interface is communicated with the second delivery cavity.

10. The double balloon catheter according to claim 8, characterized in that: The inner catheter is detachably connected to the outer catheter.

11. The double balloon catheter according to any one of claims 1-3, 5, 7, 9, and 10, characterized in that: The cross-sectional diameter of the first balloon ranges from 1 to 5 mm, and the cross-sectional diameter of the second balloon ranges from 5 to 20 mm.

12. The double balloon catheter according to claim 11, characterized in that: The cross-sectional diameter of the second balloon ranges from 8 to 12 mm, and the cross-sectional diameter of the first balloon ranges from 1.5 to 3.5 mm. The double-balloon catheter can be used for chemical ablation treatment of Marshall vein.

13. A balloon catheter system, characterized in that: The system comprises the double balloon catheter as claimed in any one of claims 1 to 12 and a mapping electrode, wherein the mapping electrode is capable of passing through the third delivery lumen.

14. The balloon catheter system according to claim 13, wherein: The mapping electrode includes a passage for passing a guide wire and / or an ablative agent.

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