Ablation catheter for small blood vessels
By designing small vascular ablation pipes, the inner core is used to form a guidance segment and the tube body setting electrode group, which solves the problem of difficulty entering and ablation small blood vessels in existing technology, and achieves efficient and accurate ablation results.
Patent Information
- Application Number
- CN202323282534.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-04
- Publication Date
- 2025-01-28
- Estimated Expiration
- 2033-12-04
AI Technical Summary
The prior art is difficult to efficiently enter and ablate small blood vessels in the heart, such as Marshall veins, especially due to their complex structure and small diameter, resulting in inaccurate ablation and low reliability.
It is designed with a small vascular ablation, including the inner core and tube. The inner core is used to form a guidance section to guide the tube to enter the small blood vessels. Combination to improve the softness and torque transmission of the guidance segment.
The catheter can safely and effectively enter the Marshall vein, perform accurate pulse melody, reduce the risk of damage to human tissues, and improve the reliability of ablation.
Smart Images
Figure CN222398727U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of medical devices, and in particular to a small blood vessel ablation catheter. Background Art
[0002] Atrial fibrillation is the most common arrhythmia, with symptoms of irregular heart beats. Existing studies have shown that many blood vessels in the heart are one of the lesions of atrial fibrillation, and ablation of them can effectively eliminate the irregular electrical signals of the heart, thereby eliminating atrial fibrillation. However, most blood vessels in the heart are small in diameter and have complex access paths, among which the Marshall vein is the most typical.
[0003] Marshall's vein is located in the Marshall's ligament. The Marshall's ligament is derived from the left superior vena cava during the fetal period. The remaining vascular cavity forms the Marshall's vein, which runs between the left atrial appendage and the left inferior pulmonary vein and flows into the coronary sinus. Studies have shown that the Marshall's vein has a significant arrhythmogenic effect and can trigger atrial premature beats, atrial tachycardia, and atrial fibrillation. Therefore, ablation of the Marshall's vein is one of the feasible options for eliminating atrial fibrillation.
[0004] Currently, chemical ablation is usually used for Marshall vein, which is achieved by injecting alcohol. However, chemical ablation is relatively complicated, consumes more medical equipment, and imposes a high economic burden on patients. On the other hand, the injection of alcohol will cause diffusion, and the ablation range is difficult to control, resulting in low reliability of chemical ablation.
[0005] At the same time, due to the complex structure and small diameter of the Marshall vein, the diameter of the coronary sinus ostium is usually only 11mm, and the average diameter of the Marshall vein flowing into the coronary sinus is even smaller at 1.9mm. The common ablation catheter body diameter is 6Fr-8Fr, and the corresponding diameter is more than 2mm. It cannot be inserted into the Marshall vein for ablation, and the current radiofrequency / pulse ablation scheme is difficult to carry out. Utility Model Content
[0006] Based on this, it is necessary to provide a small blood vessel ablation catheter to address the problem of how to enter small blood vessels, especially Marshall vein, for pulse ablation.
[0007] A small blood vessel ablation catheter, the small blood vessel ablation catheter comprising: an inner core and a tube body, the inner core being a flexible member, the tube body being sleeved outside the inner core, the distal end of the inner core extending outside the distal end of the tube body, the portion of the distal end of the inner core extending outside the distal end of the tube body forming a guide section, the guide section being used to guide the tube body into a vein, the outer diameter of the guide section being smaller than the outer diameter of the distal end of the tube body, and a first electrode group for ablation being arranged on the tube body.
[0008] In one embodiment, the small blood vessel ablation catheter also includes a coil body and a head, wherein the head is disposed at the distal end of the guide section, and the coil body is sleeved outside the guide section, with one end connected to the head and the other end connected to the distal end of the tube body.
[0009] In one embodiment, the diameter of the head gradually decreases along the direction from the proximal end to the distal end.
[0010] In one embodiment, the outer diameter of the coil body is less than or equal to 2Fr.
[0011] In one embodiment, the tube body includes a first tube body portion and a second tube body portion arranged in sequence from the distal end to the proximal end, the outer diameter of the first tube body portion is less than or equal to the minimum outer diameter of the second tube body portion, the first electrode group is arranged on the first tube body portion, and the second tube body portion is provided with a second electrode group for marking.
[0012] In one embodiment, the first electrode group includes a plurality of electrodes, and the distance between two adjacent electrodes is 2 mm-15 mm.
[0013] In one embodiment, the outer diameter of the first tube body portion is 1Fr-4Fr, and the outer diameter of the second tube body portion is 3Fr-6Fr.
[0014] In one embodiment, the inner core also includes a first core segment and a second core segment, and the guide segment, the first core segment and the second core segment are arranged in sequence from the distal end to the proximal end, the outer diameter of the guide segment is less than or equal to the outer diameter of the first core segment, the outer diameter of the first core segment is less than or equal to the outer diameter of the second core segment, the first tube body portion is sleeved outside the first core segment, and the second tube body portion is sleeved outside the second core segment.
[0015] In one embodiment, the diameter of the first core segment gradually increases from the distal end to the proximal end, the minimum outer diameter of the first core segment is equal to the outer diameter of the guide segment, and the maximum outer diameter of the first core segment is equal to the outer diameter of the second core segment.
[0016] In one embodiment, the length of the guide section is 5 mm-30 mm.
[0017] In one embodiment, the length of the first tube portion is 10 mm-70 mm.
[0018] In one embodiment, the small blood vessel ablation catheter includes a balloon portion, which is arranged at an end of the second tube body portion close to the first tube body portion. The second tube body portion is provided with a first channel extending to the proximal end, and the first channel is connected to the balloon portion.
[0019] In one embodiment, the small blood vessel ablation catheter includes a bending control portion arranged at the proximal end of the second tube body portion, the second tube body portion is provided with a bending adjustment portion, the bending adjustment portion is located on one side of the proximal end of the balloon portion, at least one second channel is opened on the second tube body portion, a cable is arranged in the second channel, and both ends of the cable are respectively connected to the bending control portion and the bending adjustment portion.
[0020] In the above-mentioned small blood vessel ablation catheter, the inner core is directly used to form the guide segment, which is conducive to the transmission of the torque applied by the operator from the proximal end to the distal end, and can also effectively reduce the outer diameter of the guide segment, so that the outer diameter of the guide segment is smaller than the diameter of the end of the tube body close to the guide segment. The distal end of the inner core extends out of the distal end of the tube body. In actual use, the guide segment can be used to guide the tube body from the coronary sinus into the Marshall vein. At the same time, the inner core directly forms the guide segment, so that the guide segment can retain the softness of the inner core and avoid damage to human tissue during the insertion process. That is, the small blood vessel ablation catheter of the present application can enable the guide segment to guide the tube body into the Marshall vein for ablation. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 Schematic diagram of the structure of a small blood vessel ablation catheter in one embodiment.
[0022] Figure 2 Schematic diagram of the structure of a small blood vessel ablation catheter without a handle in one embodiment.
[0023] Figure 3 Schematic diagram of the structure of the guide section in one embodiment.
[0024] Figure 4 Schematic diagram of the structure of the inner core in one embodiment.
[0025] Figure 5 Schematic diagram of the cross-sectional structure of the proximal end of the second tube body portion in one embodiment.
[0026] Reference numerals: 100, inner core; 110, guide segment; 120, first core segment; 130, second core segment;
[0027] 200, tube body; 210, first tube body portion; 211, first electrode group; 212, first conductive line cavity; 220, second tube body portion; 221, bending portion; 222, balloon portion; 223, second electrode group; 224, first channel; 225, second channel; 226, second conductive line cavity;
[0028] 300, guide portion; 310, coil body; 320, head;
[0029] 400, handle; 410, bending control unit; 411, rotating unit; 420, balloon connecting unit. DETAILED DESCRIPTION
[0030] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.
[0031] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.
[0032] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0033] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.
[0034] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.
[0035] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.
[0036] For ablation of the human body, especially the heart, the ablation of small blood vessels has always been one of the difficult problems. How to make the tube pass through the complex human structure and enter the target small blood vessels for ablation without damaging the human body in the process is a problem worth studying. The small blood vessels of this application take the Marshall vein as an example. The Marshall vein is one of the veins in the left atrium of the human heart. Its location means that in terms of the entry path, it is necessary to pass through the left atrium and coronary sinus of the human body in turn before finding the Marshall vein. These three parts need to be entered in turn, and the average diameters of the three parts decrease in turn. The narrow vein diameter of the Marshall vein means that the existing ablation catheter cannot be used.
[0037] For the convenience of description, the following definition is: the end that first enters the human body is the distal end, and the other end is the proximal end.
[0038] See also Figure 1 and Figure 2An embodiment of the present application provides a small blood vessel ablation catheter, which includes: an inner core 100 and a tube body 200, the inner core 100 is a flexible member, the tube body 200 is sleeved outside the inner core 100, the distal end of the inner core 100 extends out of the distal end of the tube body 200, and the portion of the distal end of the inner core 100 extending out of the distal end of the tube body 200 forms a guide section 110, the guide section 110 is used to guide the tube body 200 into the small blood vessel, the outer diameter of the guide section 110 is smaller than the outer diameter of the distal end of the tube body 200, and the tube body 200 is provided with a first electrode group 211 for ablation.
[0039] In this embodiment, the inner core 100 is directly used to form the guide segment 110. The torque applied by the operator from the proximal end is transmitted to the guide segment 110 located at the distal end through the inner core 100, which is conducive to the efficient transmission of the torque applied by the operator from the proximal end to the distal end. At the same time, it can also effectively reduce the outer diameter of the guide segment 110, so that the outer diameter of the guide segment 110 is smaller than the diameter of the end of the tube body 200 close to the guide segment 110. The tube body 200 is sleeved outside the inner core 100, and the distal end of the inner core 100 extends out of the distal end of the tube body 200. In actual use, the guide segment 110 can be used to guide the tube body 200 from the coronary sinus into the Marshall vein. At the same time, the inner core 100 directly forms the guide segment 110, so that the guide segment 110 can retain the softness of the inner core 100 and avoid damage to human tissue during the insertion process. That is, through the small blood vessel ablation catheter of the present application, the guide segment 110 can guide the tube body 200 to enter the Marshall vein for ablation.
[0040] In some embodiments, in combination Figure 3 The small blood vessel ablation catheter also includes a coil body 310 and a head 320. The head 320 is arranged at the distal end of the guide section 110. The coil body 310 is sleeved outside the guide section 110, and one end is connected to the head 320, and the other end is connected to the distal end of the tube body 200.
[0041] In this embodiment, the coil body 310 is sleeved outside the guide section 110, and the elastic effect of the coil body 310 is conducive to maintaining the softness of the guide section 110. At the same time, since the guide section 110 is relatively soft, the torque transmission ability, that is, the controllability is poor. The coil body 310 is sleeved outside the guide section 110, one end of the coil body 310 is connected to the tube body 200, and the other end is connected to the head 320. When the proximal end of the tube body 200 is subjected to a torsion action, on the one hand, the torsion force of the proximal end can be transmitted to the head 320 through the inner core 100; on the other hand, the torsion force of the proximal end can also be transmitted to the coil body 310 through the tube body 200, and the torque is then transmitted to the head 320 through the torsion action of the coil body 310. That is, the setting of the coil body 310 improves the softness and torque transmission of the guide section 110 at the same time.
[0042] In some embodiments, the diameter of the head 320 gradually decreases from the proximal end to the distal end. That is, the head 320 has a certain taper, and the distal end of the head 320 is a pointed shape with an arc, which facilitates the insertion of the guide section 110 into the Marshall vein and prevents the guide section 110 from damaging human tissues in the process of finding the Marshall vein.
[0043] The diameter of one end of the head 320 close to the coil body 310 is greater than or equal to the outer diameter of the coil body 310 to facilitate the connection of the coil body 310 .
[0044] Furthermore, the head 320 may be fixed to the distal end of the guide section 110 by threading, bonding, forging or welding.
[0045] Specifically, the coil body 310 is formed by twisting a single or multiple wires. The outer periphery of the coil body 310 is coated with a hydrophilic coating. The hydrophilic coating can improve the sliding property of the coil body 310 and further improve the torque transmission property of the guide section 110.
[0046] In some embodiments, in combination Figure 2 The tube body 200 includes a first tube body portion 210 and a second tube body portion 220 arranged in sequence from the distal end to the proximal end. The outer diameter of the first tube body portion 210 is less than or equal to the minimum outer diameter of the second tube body portion 220. The first electrode group 211 is arranged on the first tube body portion 210, and the second tube body portion 220 is provided with a second electrode group 223 for marking.
[0047] In one embodiment, the outer diameter of the first tube body portion 210 is smaller than the outer diameter of the second tube body portion 220, so that the outer diameter of the first tube body portion 210 is adapted to the diameter of the Marshall vein, and the outer diameter of the second tube body portion 220 is adapted to the diameter of the coronary sinus, thereby facilitating the first tube body portion 210 to enter the Marshall vein for ablation under the guidance of the guide section 110, and the second tube body portion 220 to map the ECG signals near the coronary sinus and the Marshall vein in the coronary sinus.
[0048] In another embodiment, the outer diameter of the first tube body portion 210 gradually increases from the distal end to the proximal end. At this time, the outer diameter of the guide section 110 is smaller than the minimum outer diameter of the first tube body portion 210, and the maximum diameter of the first tube body portion 210 may be equal to the diameter of the second tube body portion 220.
[0049] In some embodiments, the first electrode group 211 includes a plurality of electrodes, and the distance between two adjacent electrodes is 2 mm to 15 mm. If the distance between the two electrodes is too large, the current density generated by the electrodes is low, and the ablation effect is poor; if the distance between the two electrodes is too small, an arc is easily generated between the two adjacent electrodes, causing harm to the human body.
[0050] In this embodiment, the first electrode group 211 includes at least one positive electrode and one negative electrode, and due to the length limitation of the first tube 210, in the preferred embodiment of the present application, two groups of first electrode groups 211 are provided on the first tube 210. In actual use, both groups of first electrode groups 211 enter into the Marshall vein to emit pulse energy for pulse ablation of the Marshall vein.
[0051] Of course, the first electrode group 211 can also be used to emit one or more of radio frequency energy, cryogenic energy, laser, chemistry, electroporation, high-intensity focused ultrasound or ultrasound, and microwaves.
[0052] Furthermore, the first electrode group 211 can also be used to map the ECG signal in the Marshall vein.
[0053] Specifically, the first electrode group 211 is made of platinum-iridium alloy. Electrodes made of platinum-iridium alloy have the advantages of being not easy to corrode and having low contact resistance.
[0054] In some embodiments, the first tube body 210 includes a first tube body and a first electrode group 211 disposed on the first tube body. The first tube body is provided with a mounting groove, and the electrodes in the first electrode group 211 can be fixed to the first tube body by forging, welding or gluing, so that the outer surface of the first tube body is smooth without additional raised parts, thereby increasing the smoothness of the first tube body 210 in human tissue and reducing the possibility of damage to the human body during contact.
[0055] The first tube body is a hypotube, which is flexible and has a special structure that facilitates torque transmission. Meanwhile, the first electrode group 211 can also be a flexible electrode, so that the first tube body 210 can be bent along the veins of Marshall.
[0056] In some embodiments, the first tube body is a composite tube body, and the first tube body includes at least two cavities, one of which is used to pass the first core segment 120, and the other cavity is used as the first conductive wire cavity 212 for passing the conductive cable connected to the first electrode group 211.
[0057] Of course, the first tube body may also have a third cavity, through which a contrast agent may be delivered into the tissue, and the contrast agent may be used to perform imaging of the target blood vessel / Marshall's vein, so as to determine the position of the target blood vessel / Marshall's vein.
[0058] In some embodiments, the second tube portion 220 includes a second tube body and a second electrode group 223 . The second electrode group 223 is disposed at the distal end of the second tube body. The second electrode group 223 is used to receive electrical signals to implement a mapping function.
[0059] Specifically, the second electrode group 223 includes a plurality of electrodes. Since the outer diameter of the second tube body is greater than the outer diameter of the first tube body, the diameter of the electrodes in the second electrode group 223 may be greater than the diameter of the electrodes in the first electrode group 211, and accordingly, the length of the electrodes in the second electrode group 223 is less than the length of the electrodes in the first electrode group 211.
[0060] Furthermore, the small blood vessel ablation catheter also includes a handle 400, and the proximal end of the second tube body extends to the handle 400 to be connected to the handle 400. The second tube body is used to extend from outside the body into the body, so the second electrode group 223 is arranged at the distal end of the second tube body to facilitate the second electrode group 223 to extend into the coronary sinus for mapping.
[0061] In some embodiments, the diameter of the coil body 310 is less than or equal to 2Fr, the outer diameter of the first tube body portion 210 is 1Fr-4Fr, and the outer diameter of the second tube body portion 220 is 3Fr-6Fr.
[0062] Specifically, the Marshall vein is one of the veins in the left atrium of the human heart. Its location means that in terms of the access path, it is necessary to pass through the left atrium and coronary sinus of the human body in sequence before finding the Marshall vein. These three parts need to be entered in sequence, and the average diameters of the three parts decrease in sequence. The diameter of the coil body 310 is less than or equal to 2Fr. The coil body 310 is sleeved outside the guide section 110. The coil body 310, the guide section 110, and the head 320 together form a guide portion 300. The guide portion 300 is used to guide the first tube body 200 into the Marshall vein. The first tube body portion 210 is used to ablate the Marshall vein, so its outer diameter also needs to be small enough. Specifically, the outer diameter of the first tube body portion 210 is 1Fr-4Fr. The second tube body portion 220 is used to enter the coronary sinus, so its outer diameter can be larger than the first tube body portion 210, specifically 3Fr-6Fr.
[0063] In some embodiments, in combination Figure 4 The inner core 100 includes a first core segment 120 and a second core segment 130. The guide segment 110, the first core segment 120 and the second core segment 130 are arranged in sequence from the distal end to the proximal end. The outer diameter of the guide segment 110 is less than or equal to the outer diameter of the first core segment 120. The outer diameter of the first core segment 120 is less than or equal to the outer diameter of the second core segment 130. The first tube body portion 210 is sleeved outside the first core segment 120, and the second tube body portion 220 is sleeved outside the second core segment 130.
[0064] In this embodiment, the second core segment 130 is provided with a second tube body portion 220, and the proximal end of the second tube body portion 220 is connected to the handle 400. The second tube body portion 220 needs to extend from outside the patient's body to inside the patient's body during surgery, so it only needs to be extended into the patient's body along with the sheath, and does not require excessive flexibility. Therefore, the second core segment 130 can be set to the original diameter of the inner core 100.
[0065] The thickness of the inner core 100 directly affects the hardness / flexibility of the small blood vessel ablation catheter. By processing the inner core 100, the diameter of the guide section 110 becomes smaller, that is, the outer coating is removed the most. The outer coating is harder than the inner core 100. After removal, the hardness of the inner core 100 is reduced and the flexibility is improved, thereby making the guide section 110 more flexible and easier to bend. Therefore, when maneuvering to find the Marshall vein and guiding the tube body 200 to enter, the guide section 110 has higher flexibility during the search process, is not easy to damage the tissue, and improves safety.
[0066] The first core segment 120 is provided with a first tube body 210 on its outer surface, and the outer diameter of the first core segment 120 affects the outer diameter of the first tube body 210. In addition, the first tube body 210 is inserted into the Marshall vein for pulse ablation under the guidance of the guide segment 110, and its flexibility is between the guide segment 110 and the second core segment 130. Therefore, the first core segment 120 also needs to further process and polish the original inner core so that the outer diameter of the first core segment 120 is greater than or equal to the outer diameter of the guide segment 110 and less than or equal to the outer diameter of the second core segment 130.
[0067] The guide segment 110, the first core segment 120 and the second core segment 130 can be manufactured in one piece. The distal end of the second core segment 130 is connected to the handle 400. The inner core 100 is elastic, and the manipulation action applied by the handle 400 is transmitted to the entire small blood vessel ablation catheter through the inner core 100.
[0068] Of course, the guide segment 110 , the first core segment 120 , and the second core segment 130 may also be manufactured separately and then connected by welding or bonding.
[0069] Furthermore, the material of the inner core 100 is nickel-titanium alloy or stainless steel. As a memory metal, nickel-titanium alloy has good elasticity, can prevent the inner core 100 from kinking, has good compliance and durability, and is more suitable for tortuous human cavities during clinical use. Stainless steel, as the core material of traditional guide wires, is widely used. When a stainless steel core wire is used as the inner core 100, the core wire can have good support, pushing force and torsion control.
[0070] In some embodiments, in combination Figure 4, along the direction from the distal end to the proximal end, the diameter of the first core segment 120 gradually increases, the minimum outer diameter of the first core segment 120 is equal to the outer diameter of the guide segment 110 , and the maximum outer diameter of the first core segment 120 is equal to the outer diameter of the second core segment 130 .
[0071] The diameters of the guide segment 110 and the second core segment 130 may remain unchanged, and the diameter of the first core segment 120 gradually increases, so that the first core segment 120 connects the guide segment 110 and the second core segment 130 to make the surface of the entire inner core 100 smooth.
[0072] Furthermore, the guide segment 110 and the first core segment 120 may also be flat structures. The corresponding first tube body 210 and the second tube body 220 may also be flat structures, the first electrode group 211 is arranged on the flat surface of the first tube body 210, and the second electrode group 223 is arranged on the flat surface of the second tube body 220.
[0073] In some embodiments, the length of the guide segment 110 is 5 mm-30 mm.
[0074] According to the difference in length of Marshall's vein in different human bodies, for example, the length of the guide section 110 may be 5 mm, 10 mm, 15 mm, 20 mm or 30 mm.
[0075] Preferably, the length of the guide section 110 is 10 mm, which enables the guide section 110 to completely enter the Marshall vein and prevents the head 320 from puncturing the end of the Marshall vein. If the length of the guide section 110 is less than 10 mm, the guide section 110 may not completely enter the Marshall vein, and if the length of the guide section 110 is greater than 10 mm, the guide section 110 may puncture the end of the Marshall vein.
[0076] In some embodiments, the length of the first tube portion 210 is 10 mm-70 mm.
[0077] According to the difference in length of Marshall's vein in different human bodies, for example, the length of the first tube body 210 can be 10 mm, 15 mm, 20 mm, 25 mm, 30 mm, 35 mm, 40 mm, 50 mm, 60 mm or 70 mm. Since the guide portion 300 and the portion where at least two electrodes on the first tube body 210 are located should completely enter the Marshall's vein to achieve ablation of the Marshall's vein, preferably, the length of the first tube body 210 is 30 mm.
[0078] In some embodiments, in combination Figure 1 , Figure 2 as well as Figure 5The small blood vessel ablation catheter includes a balloon portion 222 , which is disposed at one end of the second tube body 220 close to the first tube body 210 . A first channel 224 extending to the proximal end is opened in the second tube body 220 , and the first channel 224 is connected to the balloon portion 222 .
[0079] Specifically, the small blood vessel ablation catheter includes a balloon connection portion 420 disposed at the proximal end of the second tube body portion 220, and the balloon connection portion 420 and the handle 400 are both located at the proximal end of the second tube body portion 220. The first channel 224 can be connected to the pump body through the balloon connection portion 420, and gas or liquid can be filled into the balloon portion 222 through the pump body.
[0080] In actual use, when the guide portion 300 drives the first tube portion 210 to the ablation position of Marshall's vein, the balloon portion 222 is located at the entrance of Marshall's vein. At this time, gas or liquid is injected into the balloon portion 222 through the first channel 224 to expand the balloon to block the entrance of Marshall's vein, thereby fixing the position of the small blood vessel ablation catheter through the balloon portion 222 to facilitate accurate ablation through the first tube portion 210.
[0081] The balloon is made of a biocompatible material, such as plastic, polyethylene terephthalate (PET), polyurethane or PEBAX.
[0082] In some embodiments, in combination Figure 1 , combined Figure 2 as well as Figure 5 The small blood vessel ablation catheter includes a bending control portion 410 arranged at the proximal end of the second tube body portion 220, a bending adjustment portion 221 is arranged on the second tube body portion 220, and the bending adjustment portion 221 is located on one side of the proximal end of the balloon portion 222. At least one second channel 225 is opened on the second tube body portion 220, and a cable is arranged in the second channel 225, and both ends of the cable are respectively connected to the bending control portion 410 and the bending adjustment portion 221.
[0083] In this embodiment, the bending control part 410 and the handle 400 are both located at the proximal end of the second tube body part 220. The bending part 221 is used to adjust the angle of the second tube body part 220, thereby changing the angle of the first tube body part 210 and the guide section 110. The bending part 221 is connected to the bending control part 410 through a cable, and by pulling the cable at one end of the bending control part 410, the second tube body part 220 can be deflected, thereby facilitating the insertion of the guide part 300 into the Marshall vein.
[0084] Specifically, the number of the second channels 225 is related to the number of adjustable directions of the bending portion 221. For example, if the adjustable directions are two, that is, the number of the second channels 225 is two, and one cable is disposed in each through hole. If the adjustable directions are four, that is, the number of the second channels 225 is four.
[0085] Taking two adjustable directions as an example, the bending control part 410 has a rotating part 411, and the two ends of the rotating part 411 are respectively connected to the cables in the two second channels 225 opposite to each other. When the rotating part 411 is rotated in one direction, one of the cables will be tightened and the other cable will be relaxed, so that the first tube body 210 is bent relative to the second tube body 220 toward the side of the tightened cable.
[0086] Specifically, the specific steps of ablation through the small blood vessel ablation catheter are: guiding the first tube body 210 and the second tube body 220 into the coronary sinus through the guide part 300; performing three-dimensional mapping of the coronary sinus and determining the entrance of the Marshall vein through the electrodes on the second tube body 220; guiding the first tube body 210 into the Marshall vein through the guide part 300; blocking the entrance of the Marshall vein through the balloon part 222; and performing pulse ablation of the Marshall vein through the electrodes on the first tube body 210.
[0087] The small blood vessel ablation catheter in the present application is provided with a flexible guide portion 300, so that it can find the position of the Marshall vein and insert it under the control of the handle 400 without the guidance of a guide wire. The first tube body 210 is provided to be able to insert into the Marshall vein to emit energy for ablation, and the second tube body 220 can be guided into the coronary sinus for mapping. That is, the present application can achieve multiple functions through a three-stage structure, reducing the need for other equipment. At the same time, only one small blood vessel ablation catheter is used, and only one insertion is required, which reduces the surgical time spent on the use of multiple equipment and reduces the surgical risk.
[0088] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0089] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.
Claims
1. A small blood vessel ablation catheter, characterized in that: The small blood vessel ablation catheter includes: an inner core and a tube body, the inner core is a flexible member, the tube body is sleeved outside the inner core, the distal end of the inner core extends out of the distal end of the tube body, and the part of the distal end of the inner core extending out of the distal end of the tube body forms a guide section, and the guide section is used to guide the tube body into the vein. The outer diameter of the guide section is smaller than the outer diameter of the distal end of the tube body, and a first electrode group for ablation is arranged on the tube body.
2. The small blood vessel ablation catheter according to claim 1, characterized in that: The small blood vessel ablation catheter also includes a coil body and a head, wherein the head is arranged at the distal end of the guide section, and the coil body is sleeved outside the guide section, with one end connected to the head and the other end connected to the distal end of the tube body.
3. The small blood vessel ablation catheter according to claim 2, characterized in that: The diameter of the head gradually decreases along the direction from the proximal end to the distal end.
4. The small blood vessel ablation catheter according to claim 2, characterized in that: The outer diameter of the coil body is less than or equal to 2Fr.
5. The small blood vessel ablation catheter according to claim 1, characterized in that: The tube body includes a first tube body portion and a second tube body portion arranged in sequence from the distal end to the proximal end, the outer diameter of the first tube body portion is less than or equal to the minimum outer diameter of the second tube body portion, the first electrode group is arranged on the first tube body portion, and the second tube body portion is provided with a second electrode group for marking.
6. The small blood vessel ablation catheter according to claim 5, characterized in that: The first electrode group includes a plurality of electrodes, and the distance between two adjacent electrodes is 2 mm-15 mm.
7. The small blood vessel ablation catheter according to claim 5, characterized in that: The outer diameter of the first tube body is 1Fr-4Fr, and the outer diameter of the second tube body is 3Fr-6Fr.
8. The small blood vessel ablation catheter according to claim 5, characterized in that: The inner core also includes a first core segment and a second core segment. The guide segment, the first core segment and the second core segment are arranged in sequence from the distal end to the proximal end. The outer diameter of the guide segment is less than or equal to the outer diameter of the first core segment. The outer diameter of the first core segment is less than or equal to the outer diameter of the second core segment. The first tube body is sleeved outside the first core segment, and the second tube body is sleeved outside the second core segment.
9. The small blood vessel ablation catheter according to claim 8, characterized in that: Along the direction from the distal end to the proximal end, the diameter of the first core segment gradually increases, the minimum outer diameter of the first core segment is equal to the outer diameter of the guide segment, and the maximum outer diameter of the first core segment is equal to the outer diameter of the second core segment.
10. The small blood vessel ablation catheter according to claim 5, characterized in that: The length of the guide section is 5mm-30mm.
11. The small blood vessel ablation catheter according to claim 5, characterized in that: The length of the first tube body is 10 mm-70 mm.
12. The small blood vessel ablation catheter according to claim 5, characterized in that: The small blood vessel ablation catheter includes a balloon portion, which is arranged at one end of the second tube body portion close to the first tube body portion. The second tube body portion is provided with a first channel extending to the proximal end, and the first channel is connected to the balloon portion.
13. The small blood vessel ablation catheter according to claim 12, characterized in that: The small blood vessel ablation catheter includes a bending control portion arranged at the proximal end of the second tube body portion, the second tube body portion is provided with a bending adjustment portion, the bending adjustment portion is located on one side of the proximal end of the balloon portion, the second tube body portion is provided with at least one second channel, a cable is arranged in the second channel, and both ends of the cable are respectively connected to the bending control portion and the bending adjustment portion.