Ablation device

Abstract

The ablation device comprises a supporting component capable of stretching out and drawing back in the radial direction, the supporting component comprises a front connecting section, a main body section and a rear connecting section which are sequentially arranged from front to back, and the main body section comprises a plurality of supporting rods distributed at intervals in the axial direction; the supporting rods are connected end to end to form an annular shape, bend and extend in a wavy shape in the axial direction of the main body section, and are connected with each other through wave crest parts and wave trough parts of the supporting rods and connected with a plurality of front supporting rods of the front connecting section and a plurality of rear supporting rods of the rear connecting section, so that each connecting part forms a U-shaped structure. The radial size of the supporting part can be adjusted within a large range, the outer diameter of the ablation device can be reduced to the maximum degree, the ablation device can enter and exit from the alimentary canal of the human body more easily, pain of a patient is relieved, the surgical operation difficulty is lowered, meanwhile, the ablation device can penetrate through clamp channel cavities of various endoscopes, and the ablation effect is improved. And the complexity of the operation is obviously reduced.

Description

Technical Field

[0001] This invention relates to the field of medical devices, specifically to an ablation device. Background Technology

[0002] Among existing technologies, duodenal mucosal remodeling (DMR) is an emerging minimally invasive endoscopic surgery. It involves inserting specialized instruments into the duodenum through an endoscope and using external energy to ablate and destroy the duodenal mucosa, thereby remodeling the duodenal mucosa and improving insulin resistance and nutrient metabolism. This novel endoscopic treatment method aims to treat metabolic syndrome. Due to its advantages such as being minimally invasive and convenient, with minimal trauma, rapid recovery, simple operation, and precise surgery, and reducing the occurrence of complications, DMR is gradually becoming a new research direction for the treatment of type II diabetes.

[0003] These ablation devices can be expanded to conform to the inner wall of the digestive tract when expanded, and can enter and exit the human digestive tract when not expanded. However, existing ablation devices are still relatively large in size when not expanded, which not only increases the complexity of the surgeon's operation, but also causes greater pain to the patient. Summary of the Invention

[0004] The purpose of this invention is to provide a novel ablation device.

[0005] The technical solution adopted in this invention is: an ablation device, the ablation device including a support component capable of radial extension and retraction, the support component including a front connecting section, a main body section and a rear connecting section arranged sequentially from front to back, the main body section including a plurality of support rods spaced apart in the axial direction, the support rods being connected end to end in a ring shape and extending in a wave-like curve in the axial direction of the main body section, the support rods having a plurality of forward-arching crests and a plurality of rear-arching troughs, and a connecting rod group being provided between any two adjacent support rods, wherein the connecting rod group connects the plurality of troughs of the front support rod and the plurality of crests of the rear support rod; The front connecting section includes multiple front support rods, the front ends of all the front support rods are gathered together and fixed to each other, and the rear ends of all the front support rods are connected one-to-one with the multiple crests of the support rod located at the foremost side; the rear connecting section includes multiple rear support rods, the rear ends of all the rear support rods are gathered together and fixed to each other, and the front ends of all the rear support rods are connected one-to-one with the multiple troughs of the support rod located at the rearmost side.

[0006] In some embodiments, the connecting rod assembly includes a plurality of connecting rods spaced apart circumferentially, each connecting rod being fixedly connected between a trough portion of the front support rod and a crest portion of the rear support rod.

[0007] In some embodiments, in two adjacent support rods, the number of troughs on the front support rod is the same as the number of crests on the rear support rod, and the same as the number of connecting rods in the connecting rod group connecting the two support rods. Multiple connecting rods are connected one-to-one between the multiple troughs on the front support rod and the multiple crests on the rear support rod.

[0008] In some embodiments, the length extension direction of all the connecting rods is parallel to the axis of the main body segment; and / or, all the support rods have the same outer diameter, and the main body segment is cylindrical.

[0009] In some embodiments, on each of the support rods, a plurality of crests and a plurality of troughs are distributed alternately and at uniform intervals in the circumferential direction.

[0010] In some embodiments, the support rods are provided in an even number, and the number of all the crests of the support rod located at the frontmost side is the same as the number of all the troughs of the support rod located at the rearmost side, and they correspond one-to-one in the circumferential direction; the number of the front support rods is the same as the number of the rear support rods, and they correspond one-to-one in the circumferential direction.

[0011] In some embodiments, the ablation device further includes: The inner rod has a first proximal end and a first distal end. An outer rod having a second proximal end and a second distal end, the outer rod being slidably fitted onto the inner rod and exposing the first distal end. The supporting component is sleeved on the inner rod, the front ends of all the front support rods are fixedly connected to the first distal end, and the rear ends of all the rear support rods are fixedly connected to the second distal end.

[0012] In some embodiments, the ablation device further includes an electrode assembly having a conductor component disposed on the support component and located on the body segment, wherein at least a portion of the conductor component is located circumferentially outside the support component.

[0013] In some embodiments, the conductor component is elongated and is wound and fixed to the support rod, and / or the connecting rod assembly includes multiple connecting rods, some or all of which are wound and fixed with the conductor component.

[0014] In some embodiments, the conductor portion is wound and fixed to the outer periphery of a portion of the support rod segment.

[0015] In some embodiments, the support rod has a wound section with the conductor component wrapped around it and an exposed section without the conductor component, the wound section and the exposed section being connected along the length direction, wherein the length of the wound section is greater than the length of the exposed section.

[0016] In some embodiments, all the connecting rods are distributed circumferentially at intervals, and the length extension direction of the connecting rods is parallel to the axis of the support member.

[0017] In some embodiments, at least two of the connecting rods are provided with the conductor component, and all the connecting rods provided with the conductor component are evenly spaced in the circumferential direction.

[0018] In some embodiments, the conductor component is a metal wire, which is spirally wound around the outer periphery of the support rod or the connecting rod along the length extension direction of the support rod, and a plurality of conductive rings are formed on the support rod or the connecting rod accordingly. There is a distance L between two adjacent conductive rings in the front-back direction, where 0≤L≤5d, and d is the diameter of the metal wire.

[0019] In some embodiments, the electrode assembly further includes a wire, one end of which is electrically connected to the conductor component, and the other end of which extends to the second proximal end. The wire includes a metal core and an insulating sleeve wrapped around the outer periphery of the metal core, and the conductor component is integrally disposed with the metal core.

[0020] Due to the application of the above technical solution, the present invention has the following advantages: The ablation device provided by the present invention includes a plurality of annular support rods on a support component. The support rods extend in a wavy shape in the axial direction and are connected to each other through their crests and troughs, as well as to multiple front support rods in the front connecting section and multiple rear support rods in the rear connecting section, so that each connecting part forms a U-shaped structure. Thus, by driving the support component to extend or shorten in the axial direction, the opening angle of the U-shape can be changed accordingly, thereby adjusting the radial dimension of the support component. This allows the radial dimension of the support component to be adjusted within a large range, which is beneficial to maximally reduce the outer diameter of the ablation device, making it easier to enter and exit the human digestive tract, reducing patient pain and surgical difficulty. At the same time, it is also beneficial to pass the ablation device through the forceps lumen of various endoscopes, significantly reducing the complexity of the surgery. Attached Figure Description

[0021] To more clearly illustrate the technical solution of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the overall structure of an ablation device according to an embodiment of the present invention; Figure 2 for Figure 1 A schematic diagram of the structure when the ablation device and guidewire are used together; Figure 3 for Figure 1 A schematic diagram of the ablation device after removing the third conduit for water injection; Figure 4 for Figure 1 A schematic diagram of the connection structure between the support component, the slender carrier, and the electrode assembly in the ablation device; Figure 5 for Figure 4 Enlarged structural diagram of section A in the middle; Figure 6 for Figure 1 A schematic diagram of the conductor section and wire arrangement in the electric field ablation device; Figure 7 for Figure 4 A schematic diagram of another embodiment of the middle A section; Figure 8 This is a schematic diagram of the connection structure between the support component, the elongated carrier, and the electrode assembly in an ablation device according to another embodiment. In the attached diagrams above: 1. Slender carrier; 11. Inner rod; 111. First distal end; 112. Inner tube seat; 113. Scale markings; 12. Outer rod; 121. Second distal end; 122. Outer tube seat; 1221. First guide tube section; 1222. Second guide tube section; 1223. Third guide tube section; 123. Locking seat; 13. Tip end; 2. Supporting components; 2A. Front connecting section; 2B. Rear connecting section; 2C. Main body section; 21. Front support rod; 22. Rear support rod; 23. Support rod; 231. Crest section; 232. Valley section; 23a. Winding section; 23b. Exposed section; 24. Connecting rod; 3. Electrode assembly; 31. Conductor component; 31a, 31b. Welding position; 311. First part; 312. Second part; 32. Wire; 32a. Insulating sleeve; 33. Wire convergence line; 34. Terminal block; 4. Guide wire. Detailed Implementation

[0023] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art. It should be noted that the description of these embodiments is for the purpose of aiding understanding the present invention, but does not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0024] In this article, "proximal" and "distal" are defined based on the distance between the ablation device and the operator after the device is inserted into the body. Specifically, "distal end" refers to the end furthest from the operator, also known as the "anterior end"; "proximal end" refers to the end closest to the operator, also known as the "posterior end." The anterior-posterior direction is also as follows... Figure 1 Indicative signage.

[0025] See Figures 1 to 8 As shown in the figure, an ablation device provided by an embodiment of the present invention is specifically an electric field ablation device for the human digestive tract. It includes a support member 2 that can extend and retract radially. Through its radial extension and retraction, the support member 2 can switch between an expanded state and a contracted state. In the expanded state, the radial dimension of the support member 2 increases, and it has a larger diameter, which can contact the inner wall of the human digestive tract to be treated for ablation treatment. In the contracted state, the radial dimension of the support member 2 decreases, and it has a relatively smaller diameter, which can easily enter and exit the human digestive tract, reduce the patient's pain, and reduce the complexity of the operation.

[0026] The ablation device also includes an elongated carrier 1, with a support component 2 mounted on the distal end of the elongated carrier 1. The operator manipulates the elongated carrier 1 to insert or remove the support component 2 into the human digestive tract. It should be noted that radial direction here is relative to axial direction. The length extension direction of the elongated carrier 1 is the axial direction, and radial direction refers to the direction perpendicular to the length extension direction of the elongated carrier 1. The radial dimension of the support component 2 is usually also referred to as the diameter of the support component 2, which is its lateral dimension.

[0027] Referring to the accompanying drawings, the support component 2 includes a front connecting section 2A, a main body section 2C, and a rear connecting section 2B arranged sequentially from front to back. The radial dimension of the main body section 2C is greater than or equal to the radial dimensions of the front connecting section 2A and the rear connecting section 2B. When the support component 2 is in an expanded state, the radial dimension of the main body section 2C is the largest, which is used to contact the inner wall of the human digestive tract for ablation treatment.

[0028] In the support component 2, the main body section 2C includes multiple support rods 23 spaced apart in the axial direction. The support rods 23 are connected end to end in a ring shape, and the support rods 23 extend in a curved shape in the axial direction of the main body section 2C, specifically in a wave-like curved shape. The support rods 23 have multiple wave crests 231 that arch forward and multiple wave troughs 232 that arch backward. A connecting rod group is provided between any two adjacent support rods 23, and the connecting rod group connects the multiple wave troughs 232 of the front support rod 23 and the multiple wave crests 231 of the rear support rod 23. The front connecting section 2A includes multiple front support rods 21 spaced apart in the circumferential direction. The front ends of all the front support rods 21 converge and are fixed to each other to form the front end of the support member 2. The rear connecting section 2B includes multiple rear support rods 22 spaced apart in the circumferential direction. The rear ends of the multiple rear support rods 22 converge and are fixed to each other to form the rear end of the support member 2. The multiple crests 231 of the support rod 23 located at the foremost side are connected to the rear ends of the multiple front support rods 21 one by one, and the multiple troughs 232 of the support rod 23 located at the rearmost side are connected to the front ends of the multiple rear support rods 22 one by one.

[0029] Thus, any two adjacent front support rods 21 and support rods 23 are connected to form a U-shaped structure, and any two adjacent rear support rods 22 and support rods 23 are connected to form a U-shaped structure. By changing the opening angle of the U-shape, the diameter of the support rod 23 can be controlled, thereby adjusting the diameter of the support component 2 and enabling the support component 2 to switch between an expanded and contracted state. By driving the front end of the front connecting section 2A and the rear end of the rear connecting section 2B to move in the front-rear direction, changing the distance between them, the support component 2 can be correspondingly stretched axially and contracted radially, or shortened axially and expanded radially, realizing the switching between the contracted and expanded states of the support component 2 and correspondingly adjusting the diameter of the support component 2. In this ablation device, the use of a wave-shaped support rod 23 to connect the front connecting section 2A and the rear connecting section 2B allows the radial dimension of the support component 2 to be adjusted within a large range. This helps to minimize the outer diameter of the ablation device, making it easier to enter and exit the human digestive tract, reducing patient pain and surgical difficulty. At the same time, it also facilitates the passage of the ablation device through the forceps lumen of various endoscopes, significantly reducing the complexity of the surgery.

[0030] Furthermore, in this ablation device, the connecting rod assembly includes multiple connecting rods 24 spaced apart circumferentially. All connecting rods 24 are correspondingly fixedly connected between multiple troughs 232 of the front support rod 23 and multiple crests 231 of the rear support rod 23. Thus, the connection between two adjacent connecting rods 24 is also a U-shaped structure on the support rod 23. When the front end of the front connecting segment 2A and the rear end of the rear connecting segment 2B move in the front-rear direction, the connecting rod 24 also acts on the two support rods 23 it connects to, thereby changing the opening angle of the corresponding U-shape, which in turn changes the axial length of the main body segment 2C and adjusts its radial dimensions.

[0031] See Figures 4 to 8 As shown, in two adjacent support rods 23, the number of troughs 232 on the front support rod 23 is the same as the number of crests 231 on the rear support rod 23, and the number of connecting rods 24 in the connecting rod group connecting the two support rods 23 is the same. These multiple connecting rods 24 are connected one-to-one between the multiple troughs 232 of the front support rod 23 and the multiple crests 231 of the rear support rod 23. The length extension direction of all connecting rods 24 is parallel to the axis of the main body segment 2C. When the front end of the front connecting segment 2A and the rear end of the rear connecting segment 2B move in the front-rear direction, each U-shaped structure on the support rod 23 can deform along the direction parallel to the axis of the support component 2, and correspondingly achieve radial contraction or expansion. During the contraction and expansion process, there is no stacking phenomenon between the rods, which is conducive to making the support rods 23 and connecting rods 24 tightly closed together, and correspondingly making the radial dimension of the support component 2 as small as possible.

[0032] Referring to the accompanying drawings, in the support component 2, multiple crests 231 and multiple troughs 232 on each support rod 23 are evenly spaced and alternately distributed in the circumferential direction. Correspondingly, all connecting rods 24 of the connecting rod group are also evenly spaced in the circumferential direction.

[0033] In this support component 2, the support rods 23 are provided with an even number of rods, such as... Figure 4 The two shown in the embodiment are examples where the connecting rod group is one set; for example, Figure 8The embodiment shows four rods, with three sets of connecting rods spaced apart along the axial direction; of course, there can be more even numbers of rods. In this way, all the crests 231 on the foremost support rod 23 are the same number as all the troughs 232 on the rearmost support rod 23, and their circumferential positions correspond one-to-one. Similarly, the front support rod 21 and the rear support rod 22 are the same number and their circumferential positions correspond one-to-one. When the support component 2 transitions between a contracted and expanded state, each rod can move relatively uniformly toward or away from the axis of the support component 2. The deformation of the support component 2 is more uniform, ensuring that the main body 2C of the support component 2 always remains cylindrical, and that the front connecting section 2A and the rear connecting section 2B remain conical. This helps maintain the rounded structure of the support component 2, making it smoother during entry and exit from the human digestive tract and avoiding damage to the inner wall of the digestive tract. Simultaneously, it also improves the adhesion of the conductor component 31, which serves as the ablation electrode.

[0034] Referring to the accompanying drawings, in this ablation device, the elongated carrier 1 includes an inner rod 11 and an outer rod 12. The inner rod 11 has a first proximal end and a first distal end 111, and the outer rod 12 has a second proximal end and a second distal end 121. The outer rod 12 is slidably sleeved on the inner rod 11 and exposes the first distal end 111. The support member 2 is sleeved on the inner rod 11. The front ends of all the front support rods 21 are connected to the first distal end 111, and the rear ends of all the rear support rods 22 are connected to the second distal end 121. When the inner rod 11 and the outer rod 12 are driven to move relative to each other in the front-rear direction, the front end of the front connecting section 1A and the rear end of the rear connecting section 2B can be moved relative to each other in the front-rear direction accordingly, thereby adjusting the radial dimension of the support part 2. In specific operation, when the support component 2 is in the expanded state, while keeping the position of the inner rod 11 unchanged, the outer rod 12 is driven to move backward. The rear end of the rear connecting section 2B is pulled backward and away from the front end of the front connecting section 1A, which reduces the radial dimension of each section on the support component 2, and the support component 2 is correspondingly switched to the contracted state. When the support component 2 is in the contracted state, while keeping the position of the inner rod 11 unchanged, the outer rod 12 is driven to move forward. The distance between the rear end of the rear connecting section 2B and the front end of the front connecting section 1A decreases, which reduces the radial dimension of each section on the support component 2, and the support component 2 is correspondingly switched to the expanded state.

[0035] In its specific design, the support component 2 is made of shape memory material. This shape memory material can be a metallic material such as nickel-titanium alloy, or a shape memory polymer such as thermoplastic polyester elastomer processed with a special technique. The maximum radial dimension of the support component 2 is the shape of the shape memory alloy after heat setting, for example, nickel-titanium alloy, whose heat setting temperature is typically 500 degrees Celsius. The support component 2 can be manufactured by laser cutting of nickel-titanium tubes or by weaving nickel-titanium wires. Within human tissue, if no external force is applied, the support component 2 can automatically return from its loaded state to its expanded state with maximum radial dimension through a temperature-induced phase transition. The radial dimension of the support component 2, i.e., its maximum diameter, is preferably between 10 mm and 50 mm.

[0036] The ablation device also includes an electrode assembly 3, which has a conductor component 31 disposed on the support component 2 and located in the main body segment 2C. At least a portion of the conductor component 31 is located on the circumferential outer side of the support component 2, and it can act as an ablation electrode to adhere to the inner wall of the digestive tract for ablation treatment.

[0037] Referring to the accompanying drawings, in the ablation device provided in this embodiment, the support rod 23 and each connecting rod 24 are located on the outer periphery of the support member 2, and the distance between them and the axis of the support member 2 is approximately half the radial dimension of the support member 2. The conductor member 31 is elongated and is wound and fixed to the support rod 23, and / or, partially or all of the connecting rods 24. By winding the elongated conductor member 31 onto the rods on the support member 2, the portion of the conductor member 31 located on the outer side of the support member 2 can contact the human digestive tract for ablation treatment when the support member 2 expands. This arrangement has the following advantages: (1) By using a slender conductor component 31 and winding it around the outer periphery of the support rod 23 or the connecting rod 24 in a spiral manner, the conductor component 31 can be fixed to the support component 2 to form an ablation electrode, which makes the manufacturing process simpler; when setting it up, metal wire can be directly used as the conductor component 31, which reduces material costs. (2) It is no longer necessary to set the electrode components on the mounting base and glue them to the support component 2. This avoids the continuous increase in the radial dimension of the ablation device due to the superposition of multiple materials and processes, so that the outer diameter of the ablation device can be minimized, making it easier to enter and exit the human digestive tract, reducing patient pain and reducing the difficulty of surgical operation. At the same time, it is also beneficial to pass the ablation device through the forceps lumen of various endoscopes, significantly reducing the complexity of the operation. (3) No more glue is needed, avoiding biocompatibility risks and the risk of electrode detachment caused by adhesive curing; (4) The conductor component 31 is fixed on the support rod 23 or connecting rod 24 on the support component 2, and can deform accordingly with the support component 2. When facing digestive tracts of different diameters, when the radial dimension of the support component 2 changes, the support rod 23 or connecting rod 24 can correspondingly change the position of the conductor component 31, which serves as the ablation electrode, in the radial direction, so as to fit closely with the digestive tract tissue and achieve a precise ablation effect; (5) By winding the conductor component 31 onto the support rod 23 or the connecting rod 24 to form the ablation electrode, the shape and size of the support component 2 are no longer too restricted, and different structures can be designed according to actual functional needs. In actual installation, the number of conductor components 31 can be increased in the circumferential and axial directions as needed to improve the uniformity of ablation.

[0038] Specifically, such as Figure 4 In the illustrated embodiment, conductor components 31 are all disposed on the connecting rods 24. Specifically, conductor components 31 are disposed on some or all of the connecting rods 24. Preferably, conductor components 31 are disposed on two or more connecting rods 24, and all connecting rods 24 with conductor components 31 are evenly spaced in the circumferential direction, resulting in a more uniform distribution of conductor components 31 in the circumferential direction of the support member 2, effectively improving the uniformity of ablation. Here, all connecting rods 24 are evenly spaced in the circumferential direction, and conductor components 31 are disposed alternately on each. Specifically, the conductor components 31 can be gradually wound along the length extension direction of the connecting rod 24 from one end to the other, so that conductor components 31 are wound along the entire length of the connecting rod 24. This allows conductor components 31 to be arranged as ablation electrodes as much as possible along the length of the main body 2C, improving ablation efficiency. In this embodiment, the length of the connecting rod 24 is set to be more than half the length of the main body segment 2C. The conductor component 31 is wrapped around the entire length of the connecting rod 24, which can significantly reduce the overall size of the support component 2 while meeting the ablation length requirement.

[0039] like Figure 8 In another embodiment shown, the conductor component 31 is disposed on the outer periphery of a portion of the support rod 23, and can form an ablation electrode of a certain length in the axial direction of the main body segment 2C. Specifically, the conductor component 31 is wound around a portion of the support rod 23, and there is a certain gap between the two ends of the conductor component 31. The support rod 23 has a wound segment 31a with the conductor component 31 wound around it, and an exposed segment 31b without the conductor component 31. The wound segment 31a and the exposed segment 31b are connected along the length direction. Here, the length of the wound segment 31a is greater than the length of the exposed segment 31b to improve the ablation efficiency.

[0040] Referring to the accompanying drawings, in this ablation device, the electrode assembly 3 further includes a wire 32, one end of which is electrically connected to the conductor component 31, and the other end of which extends to the proximal end of the elongated carrier 1 to connect to an external energy device. Figure 5 , Figure 6 As shown, the conductor 32 includes a metal inner core and an insulating sleeve 32a wrapped around the outer periphery of the metal inner core. The conductor component 31 is connected to the metal inner core along its length. In actual installation, the conductor component 31 is integrally formed with the metal inner core. A section of the insulating sleeve 32a at the front of the conductor can be directly peeled off to serve as the conductor component 31, which is then wound and fixed to the support rod 23 as an ablation electrode. The conductor 32 can be wound onto the rear support rod 22 and passed through a hole in the outer rod 12 to the proximal end of the outer rod 12.

[0041] Because the conductor component 31 is spirally wound around the support rod 23, the self-binding and frictional action of the conductor component 31 allows it to be firmly fixed to the support rod 23 and combined with the support component 2, preventing it from easily falling off. Furthermore, the conductor component 31 forms multiple conductive rings on the support rod 23. Two or more adjacent conductive rings can be fixed together by welding, and at least the conductive rings at both ends of the conductor component 31 on the support rod 23 can be fixed separately by welding. Figure 5 The welding positions 31a and 31b make it more secure and reliable on the support rod 23. The multiple conductive rings formed by the conductor component 31 wound on the support rod 23 have a spacing L in the front-to-back direction, where 0≤L≤5d, and d is the diameter of the metal wire forming the conductor component 31. That is to say, the conductor component 31 can be tightly wound on the support rod 23 one turn at a time, or it can be wound on the support rod 23 at a certain spacing, but the front-to-back spacing between two adjacent electrode rings is not greater than five times the diameter of the metal wire.

[0042] In some other embodiments, such as Figure 7As shown, the conductor component 31 can also be divided into a first part 311 and a second part 312 connected along the length direction. The first part 311 extends along the length direction of the support rod 23, and the first part 311 and the support rod 23 are wrapped together in the second part 312. This further reduces the risk of the conductor component 31 falling off. In a specific configuration, the part of the conductor with the insulation sleeve 32a removed can be first pressed and fixed to the rear end of the support rod 23. Then, along the length direction of the support rod 23, the metal core of this part can be pressed onto the support rod 23 to the front end of the support rod 23. This section is the first part 311. Subsequently, the metal core is wound around the support rod 23 and the first part 311 backwards until it is wound to the rear end of the support rod 23. Then, the conductor 32 with the insulation sleeve 32a is wound to the front support rod 21 and / or the rear support rod 22 and passed through to the near end of the outer rod 12.

[0043] See Figure 1 As shown, in this ablation device, the slender carrier 1 also includes a flexible tip 13, which is fixedly mounted on the first distal end 111 of the inner rod 11. It can not only cover the front ends of multiple front support rods 21, but also its smooth front end structure makes the ablation device enter the human digestive tract more smoothly, avoiding scratching the digestive tract tissue during the process.

[0044] The outer rod 12 is specifically a multi-cavity pipe, which has multiple cavities extending through the length direction. The central cavity is used to slide the inner rod 11 through, and the other cavities are used for the wire 32 to pass through, or for other components to pass through. Here, an outer tube seat 122 is fixedly provided at the proximal end of the outer rod 12. The outer tube seat 122 has a first conduit portion 1221, a second conduit portion 1222, and a third conduit portion 1223, which communicate with multiple cavities on the outer rod 12, respectively. The first conduit portion 1221 is used for the inner rod 11 to slide through. The second conduit portion 1222 is used for the converging wire line 33 formed by the convergence of the proximal ends of all the wires 32 in the electrode assembly 3 to pass through. The converging wire line 33 is connected to the energy device through a fixedly provided contact seat 34. The third conduit portion 1223 serves as a liquid injection channel for introducing liquid during the operation to deal with possible excessive mucus secretion during ablation, which could affect the adhesion between the electrode and the tissue. The liquid injection channel can effectively flush the intestine. In addition, water injection will also improve the conductivity between the discharge electrode and the tissue, reducing the negative impact of poor adhesion on ablation. Of course, in some other embodiments, the third conduit portion 1223 and the liquid injection channel may not be provided, such as... Figure 3 As shown.

[0045] See Figure 1As shown, in this ablation device, the first proximal end of the inner rod 11 extends to the rear of the outer tube seat 122. The inner tube seat 112 is fixedly mounted on the first proximal end to facilitate the operator's grip and manipulation of the inner rod 11. The outer tube seat 122 is also provided with a locking member (not shown in the figure) for locking the inner rod 11 onto the outer tube seat 122, thereby locking the radial dimension of the support member 2. Here, the rear end of the first conduit portion 1221 has the aforementioned locking member, which can be achieved by pressing a silicone gasket. The friction of the silicone gasket is used to press against the outer periphery of the inner rod 11, thereby fixing the inner rod 11 and the outer rod 12 together and ensuring that the support member 2 maintains a stable shape during the ablation process. Specifically, the first proximal end of the inner rod 11 is also provided with a scale mark 113 to display the radial dimension of the support member 2 after expansion at the current position.

[0046] When endoscopy is needed, after the endoscope is inserted into the body, the support component 2 can be converted to a retractable state, and the entire ablation device can be inserted into the human digestive tract through the endoscope channel. When endoscopy is not needed, and the device needs to be inserted directly into the intestine through the oral cavity, such as... Figure 2 As shown, a track can be established first under the DSA device using guide wire 4. Then, the inner cavity of the ablation device's inner rod 11 is inserted through guide wire 4, and the ablation device is then delivered to the target position. Generally, the inner rod 11, outer rod 12, and tip 13 can all be made of medical-grade polymer materials, such as nylon, Pebax, PET, PE, etc. The material used for the tip 13 will have a lower hardness than the materials of the inner rod 11 and outer rod 12. The inner rod 11 can also be a spring-loaded metal rod, which can maintain the flexibility of the inner rod 11 while providing sufficient support, preventing the inner rod 11 from bending or being flattened when locked by the locking mechanism during delivery.

[0047] Of course, in other embodiments, such as when used for ablation treatment in areas other than digestive tract ablation therapy, the support component of the ablation device can also adopt the above-described structure, which is beneficial to make the support component obtain the smallest possible radial dimension in the contracted state, thereby greatly reducing the complexity of the surgical operation and reducing the patient's pain.

[0048] It is understood that the same or similar parts in the above embodiments can be referred to each other, and the contents not described in detail in some embodiments can be referred to the same or similar contents in other embodiments.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art. In the event of any contradiction or inconsistency between the definitions used herein and those contained in other published documents, the definitions used herein shall prevail.

[0050] It should also be noted that "rotational connection" in the above embodiments refers to pivot connection, unless the context clearly indicates other rotational connection methods.

[0051] As indicated in this specification and claims, the terms "comprising" and "including" only indicate the inclusion of explicitly identified steps and elements, and these steps and elements do not constitute an exclusive list, and the method or apparatus may also include other steps or elements.

[0052] It can be further understood that in this disclosure, "multiple" refers to two or more, and other quantifiers are similar. "And / or" describes the relationship between related objects, indicating that three relationships can exist; for example, A and / or B can represent: A alone, A and B simultaneously, and B alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. The singular forms "a," "the," and "the" are also intended to include the plural forms unless the context clearly indicates otherwise.

[0053] It is further understood that the terms "first," "second," etc., are used to describe various types of information, but this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another, and do not indicate a specific order or degree of importance. In fact, the expressions "first," "second," etc., are completely interchangeable. For example, without departing from the scope of this disclosure, first information can also be referred to as second information, and similarly, second information can also be referred to as first information.

[0054] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. An ablation device, characterized in that: The ablation device includes a support component capable of radial extension and retraction. The support component includes a front connecting section, a main body section, and a rear connecting section arranged sequentially from front to back. The main body section includes multiple support rods spaced apart in the axial direction. The support rods are connected end to end in a ring shape and extend in a wave-like curve in the axial direction of the main body section. Each support rod has multiple crests arched forward and multiple troughs arched backward. A connecting rod group is provided between any two adjacent support rods. The connecting rod group connects the multiple troughs of the front support rod to the multiple crests of the rear support rod. The front connecting section includes multiple front support rods, the front ends of all the front support rods are gathered together and fixed to each other, and the rear ends of all the front support rods are connected one-to-one with the multiple crests of the support rod located at the foremost side; the rear connecting section includes multiple rear support rods, the rear ends of all the rear support rods are gathered together and fixed to each other, and the front ends of all the rear support rods are connected one-to-one with the multiple troughs of the support rod located at the rearmost side.

2. The ablation device according to claim 1, characterized in that: The connecting rod assembly includes multiple connecting rods spaced apart circumferentially, each connecting rod being fixedly connected between a trough portion of the front support rod and a crest portion of the rear support rod.

3. The ablation device according to claim 2, characterized in that: In two adjacent support rods, the number of troughs on the front support rod is the same as the number of crests on the rear support rod, and the number of connecting rods is the same as the number of connecting rods in the connecting rod group connecting the two support rods. Multiple connecting rods are connected one-to-one between the multiple troughs on the front support rod and the multiple crests on the rear support rod.

4. The ablation device according to claim 3, characterized in that: The length extension direction of all the connecting rods is parallel to the axis of the main body segment; and / or, all the support rods have the same outer diameter, and the main body segment is cylindrical.

5. The ablation device according to claim 1, characterized in that: On each of the support rods, a plurality of crests and a plurality of troughs are distributed alternately and at uniform intervals in the circumferential direction.

6. The ablation device according to claim 1, characterized in that: The support rods have an even number of members. The number of crests on the frontmost support rod is the same as the number of troughs on the rearmost support rod, and they correspond one-to-one in the circumferential direction. The number of front support rods is the same as the number of rear support rods, and they correspond one-to-one in the circumferential direction.

7. The ablation device according to any one of claims 1 to 6, characterized in that: The ablation device further includes: The inner rod has a first proximal end and a first distal end. An outer rod having a second proximal end and a second distal end, the outer rod being slidably fitted onto the inner rod and exposing the first distal end. The supporting component is sleeved on the inner rod, the front ends of all the front support rods are fixedly connected to the first distal end, and the rear ends of all the rear support rods are fixedly connected to the second distal end.

8. The ablation device according to claim 7, characterized in that: The ablation device further includes an electrode assembly having a conductor component disposed on the support component and located on the main body segment, wherein at least a portion of the conductor component is located on the circumferentially outer side of the support component.

9. The ablation device according to claim 8, characterized in that: The conductor component is elongated and is wound and fixed to the support rod, and / or the connecting rod assembly includes multiple connecting rods, some or all of which are wound and fixed with the conductor component.

10. The ablation device according to claim 9, characterized in that: The conductor portion is wound and fixed to the outer periphery of a section of the support rod.

11. The ablation device according to claim 10, characterized in that: The support rod has a wound section with the conductor component wrapped around it, and an exposed section without the conductor component. The wound section and the exposed section are connected along the length direction, wherein the length of the wound section is greater than the length of the exposed section.

12. The ablation device according to claim 9, characterized in that: All of the connecting rods are distributed circumferentially at intervals, and the length extension direction of the connecting rods is parallel to the axis of the support member.

13. The ablation device according to claim 12, characterized in that: The conductor component is provided on at least two of the connecting rods, and all the connecting rods provided with the conductor component are evenly spaced in the circumferential direction.

14. The ablation device according to claim 9, characterized in that: The conductor component is a metal wire, which is spirally wound around the outer periphery of the support rod or the connecting rod along the length extension direction of the support rod, and forms a plurality of conductive rings on the support rod or the connecting rod accordingly. There is a distance L between two adjacent conductive rings in the front-back direction, where 0≤L≤5d, and d is the diameter of the metal wire.

15. The ablation device according to claim 9, characterized in that: The electrode assembly further includes a wire, one end of which is electrically connected to the conductor component, and the other end of which extends to the second proximal end. The wire includes a metal core and an insulating sleeve wrapped around the outer periphery of the metal core. The conductor component is integrally formed with the metal core.

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