An ablation catheter

Abstract

The utility model relates to medical instrument technical field provides an ablation catheter, include: outer tube, inner tube subassembly, the proximal end of inner tube subassembly can be along the axial direction movement of outer tube is inserted in the outer tube, basket electrode subassembly, the distal end of inner tube subassembly has plane structure to make after the distal end connection of inner tube subassembly and basket electrode subassembly forms plane end head in the distal end of ablation catheter, control handle, through control handle control basket electrode subassembly gathers or opens. The utility model provides ablation catheter, the distal end of inner tube subassembly has plane structure to make after the distal end connection of inner tube subassembly and basket electrode subassembly forms plane end head in the distal end of ablation catheter, compared with the ablation catheter in the prior art, because the distal end of ablation catheter is plane end head, during the treatment, when ablation catheter enters the heart cavity, can reduce the risk that ablation catheter head end punctures the inner wall of heart cavity.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to an ablation catheter. Background Technology

[0002] Ablation catheters play a crucial role in the field of cardiac electrophysiology, primarily used to treat cardiac diseases such as arrhythmias. In recent years, the use of ring-shaped multipolar ablation catheters has been widely adopted due to their advantages over monopolar ablation catheters, including shorter ablation time, less radiation exposure time, and reduced operator skill requirements. However, the unique structure of pulmonary veins and individual differences can prevent effective adhesion between the catheter and the target site, leading to insufficient electric field and inadequate therapeutic effects. Petal-shaped basket catheters, on the other hand, can adjust the size of the basket by the elastic bending of its circumferentially distributed basket framework to accommodate pulmonary vein cavities of varying sizes.

[0003] Existing ablation catheters include: a first catheter, the proximal end of which is connected to the control handle of an ablation device; and an ablation component disposed at the distal end of the first catheter, including multiple splines, each spline having at least one electrode. The electrode is disposed on a surface of the spline away from the longitudinal axis of the first catheter, and covers 1 / 3 to 1 / 2 of the transverse surface of the spline. This ablation catheter, with the electrode disposed on a surface of the spline away from the longitudinal axis of the first catheter and covering 1 / 3 to 1 / 2 of the transverse surface of the spline, avoids discharge into empty space (discharge in directions other than towards the tissue), reduces bubble formation, and makes ablation safer. Furthermore, discharging only to one side reduces the current required for pulsed ablation. However, in this ablation catheter, the distal ends of the multiple splines are fixedly connected to a distal cap, i.e., the distal cap gathers the multiple splines together. When the catheter enters the heart chamber, the protruding distal cap poses a risk of puncturing the heart chamber wall during surgery. Utility Model Content

[0004] Therefore, this invention aims to solve the problem that the protruding distal cap of existing ablation catheters poses a risk of puncturing the inner wall of the heart cavity during surgery, thus providing an ablation catheter.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0006] This utility model provides an ablation catheter, comprising: an outer tube; an inner tube assembly, the proximal end of which is movably inserted into the outer tube along the axial direction of the outer tube; a basket electrode assembly, including multiple electrode arms, the multiple electrode arms extending from the distal end of the inner tube assembly and converging at the distal end of the outer tube; the distal end of the inner tube assembly has a planar structure, so that after the distal end of the inner tube assembly is connected to the distal end of the basket electrode assembly, a planar end is formed at the distal end of the ablation catheter; and a control handle, the distal end of which is connected to the proximal end of the outer tube, the proximal end of the inner tube assembly extending into the control handle, so as to control the basket electrode assembly to retract or open via the control handle.

[0007] Furthermore, the control handle includes a housing, a push-pull switch, and a transmission guide mechanism disposed within the housing; the proximal end of the outer tube is connected to the distal end of the housing; the proximal end of the inner tube assembly extends into the housing and is connected to the transmission guide mechanism; the operating end of the push-pull switch is located outside the housing, and the actuating end of the push-pull switch is connected to the transmission guide mechanism; the net basket electrode assembly is controlled to retract or open by toggling the push-pull switch.

[0008] Furthermore, the transmission guide mechanism includes a slide rail, a slider, a rack, and a gear; the slider is slidably disposed on the slide rail along the length direction of the control handle; the proximal end of the inner tube assembly extends into the housing and is connected to the slider; the gear is rotatably disposed in the housing about its own axis, the rack meshes with the gear, and the rack is connected to the slider; the actuating end of the push-pull switch is connected to the rack.

[0009] Furthermore, the slider is provided with a slot, and the inner tube assembly is inserted into the slot to connect the inner tube assembly to the slider.

[0010] Furthermore, the slide rail is provided with a slide groove, and the slider is linearly slidable within the slide groove along the axial direction of the inner tube assembly.

[0011] Furthermore, the push-pull switch is provided with a first square boss, and the rack is provided with a square countersunk hole. The first square boss is embedded in the square countersunk hole so that the push-pull switch and the rack are interconnected.

[0012] Furthermore, the slider is provided with a second square boss, which is embedded in the square countersunk hole to interconnect the slider and the rack.

[0013] Furthermore, the gear is a gear with rotational damping function.

[0014] The technical solution of this utility model has the following advantages:

[0015] The ablation catheter provided by this utility model has a basket electrode assembly consisting of multiple electrode arms extending from the distal end of the inner tube assembly and converging at the distal end of the outer tube. The distal end of the inner tube assembly has a planar structure, so that after the distal ends of the inner tube assembly and the basket electrode assembly are connected, a planar tip is formed at the distal end of the ablation catheter. Compared with the ablation catheters in the prior art, since the distal end of the ablation catheter is a planar tip, the risk of the ablation catheter tip puncturing the inner wall of the heart chamber can be reduced when the ablation catheter enters the heart chamber during treatment. In addition, a control handle is provided to control the basket electrode assembly to retract or open, making it convenient to use. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the ablation catheter in one embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of the basket electrode assembly in the ablation catheter according to one embodiment of the present invention;

[0019] Figure 3 This is a schematic diagram of the control handle in the ablation catheter according to one embodiment of the present invention.

[0020] Explanation of reference numerals in the attached figures:

[0021] 1. Outer tube; 2. Basket electrode assembly; 3. Electrode arm; 4. Inner tube assembly; 401. Inner tube; 402. Inner tube connector; 5. Flat end; 6. Control handle; 7. Push-pull switch; 8. Slider; 9. Slide rail; 10. Rack; 11. Gear; 12. Housing. Detailed Implementation

[0022] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0023] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0025] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0026] like Figure 1 This embodiment provides an ablation catheter, comprising: an outer tube 1; an inner tube assembly 4, the proximal end of which is movably inserted into the outer tube 1 along the axial direction of the outer tube 1; a basket electrode assembly 2, comprising a plurality of electrode arms 3, the plurality of electrode arms 3 extending from the distal end of the inner tube assembly 4 and converging at the distal end of the outer tube 1; the distal end of the inner tube assembly 4 having a planar structure, so that after the inner tube assembly 4 is connected to the distal end of the basket electrode assembly 2, a planar end 5 is formed at the distal end of the basket electrode assembly 2; and a control handle 6, the distal end of which is connected to the proximal end of the outer tube 1, the proximal end of the inner tube assembly 4 extending into the control handle 6, so as to control the basket electrode assembly 2 to retract or open via the control handle 6.

[0027] The ablation catheter provided in this embodiment has a basket electrode assembly 2 consisting of multiple electrode arms 3 extending from the distal end of the inner tube assembly 4 and converging at the distal end of the outer tube 1. The distal end of the inner tube assembly 4 has a planar structure, so that after the inner tube assembly 4 is connected to the distal end of the basket electrode assembly 2, a planar tip 5 is formed at the distal end of the basket electrode assembly 2. Compared with the ablation catheters in the prior art, since the distal end of the ablation catheter is a planar tip 5, the risk of the ablation catheter tip puncturing the inner wall of the heart chamber can be reduced when the ablation catheter enters the heart chamber during treatment. In addition, a control handle 6 is provided, which can be used to control the basket electrode assembly 2 to retract or open, making it convenient to use.

[0028] like Figure 2 As shown, the multiple electrode arms 3 are integral structures formed by cutting a single flexible electrode. In their natural state, the multiple electrode arms 3 have a structure that radiates outward from the center; for example, the multiple electrode arms 3 can be petal-shaped. For example, the distal ends of the multiple electrode arms 3 are connected, and the connected area has a certain size, while the proximal ends radiate outward. In use, an assembly hole can be provided in the center of the connected area at the distal ends of the multiple electrode arms 3 to facilitate connection with the inner tube assembly 4. The proximal ends of the multiple electrode arms 3 can all be fixedly connected to the outer tube 1. With this configuration, compared to a basket electrode assembly 2 formed by coupling a single electrode arm 3 at its distal end in a similar manner to its proximal end, the overall strength of the basket electrode assembly 2 is higher. Moreover, the deformation of each electrode arm 3 after being subjected to force is consistent, which can improve the coordination between the various electrode arms 3 of the entire basket electrode assembly 2.

[0029] Specifically, the inner tube assembly 4 may include an inner tube connector 402 and an inner tube 401; an assembly hole is provided at the center of the distal end of the basket electrode assembly 2; the inner tube connector 402 is generally T-shaped and is inserted into the assembly hole along the direction from the distal end to the proximal end of the basket electrode assembly 2; the inner tube 401 is inserted into the inner tube connector 402 along the direction from the proximal end to the distal end of the inner tube connector 402 and is fixedly connected to the inner tube connector 402; the proximal end of the inner tube 401 can be movably inserted into the outer tube 1 along the axial direction of the outer tube 1.

[0030] like Figure 3As shown, the ablation catheter also includes a control handle 6; the control handle 6 includes a housing 12, a push-pull switch 7, and a transmission guide mechanism disposed within the housing 12. The transmission guide mechanism includes a slide rail 9, a slider 8, a rack 10, and a gear 11; the slider 8 is slidably disposed on the slide rail 9 along the length direction of the control handle 6; the proximal end of the outer tube 1 is connected to the distal end of the housing 12; the proximal end of the inner tube 401 extends into the housing 12 and is connected to the slider 8; the rack 10 is meshed with the gear 11 and is connected to the slider 8; the operating end of the push-pull switch 7 is located outside the housing 12, and the actuating end of the push-pull switch 7 is connected to the rack 10; the basket electrode assembly 2 is controlled to retract or open by moving the push-pull switch 7. For example, a slot can be provided on the slider 8, and the inner tube 401 can be inserted into the slot to connect the two together. For example, a groove can be provided in the slide rail 9, which can be a T-shaped groove, allowing the slider 8 to slide linearly along the axial direction of the inner tube 401 within the groove. For example, the push-pull switch 7 can include a first square boss, and a corresponding square countersunk hole can be provided on the rack 10. The first square boss can be embedded in the square countersunk hole to interconnect the rack 10 and the push-pull switch 7. For example, the slider 8 can include a second square boss, which can be embedded in the square countersunk hole on the rack 10 to interconnect the slider 8 and the rack 10. For example, the gear 11 can be a gear 11 with rotational damping function. In use, when the push-pull switch 7 is pushed forward, the push switch causes the slider 8 to slide forward, and the slider 8 then causes the inner tube 401 to move forward, causing the basket electrode assembly 2 to retract. Conversely, when the push-pull switch 7 is pushed backward, the push switch causes the slider 8 to slide backward, and the slider 8 then causes the inner tube 401 to move backward, causing the basket electrode assembly 2 to open. Since gear 11 is a gear with rotational damping function, gear 11 will have a certain resistance when it rotates. When rack 10 moves in a straight line, it drives gear 11 to rotate. Therefore, the straight line movement of rack 10 also has a certain resistance. In use, gear 11 and rack 10 can stay at any position. The corresponding basket electrode assembly 2 can be stably supported in its corresponding shape without being deformed by other forces. This can enhance the stability of any open shape of basket electrode assembly 2 and allow gear 11 to infinitely adjust the opening shape of basket electrode assembly 2.

[0031] In summary, the ablation catheter in this application has a planar end 5, and the metal skeleton layer is integrally formed by spinning a planar high-toughness metal, resulting in higher coordination between the expansion and contraction deformation of the electrode arms 3.

[0032] The ablation catheter in this application, including the inner tube 401, push-pull switch 7, rack 10, and positioning torque gear 11, can enhance the stability of any open configuration of the basket electrode assembly 2.

[0033] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. An ablation catheter, characterized in that, include: Outer tube (1); Inner tube assembly (4), the proximal end of which is movably inserted into the outer tube (1) along the axial direction of the outer tube (1); The basket electrode assembly (2) includes multiple electrode arms (3), which extend from the distal end of the inner tube assembly (4) and converge at the distal end of the outer tube (1); The distal end of the inner tube assembly (4) has a planar structure so that after the inner tube assembly (4) is connected to the distal end of the basket electrode assembly (2), a planar end (5) is formed at the distal end of the ablation catheter. A control handle (6) is provided, the distal end of which is connected to the proximal end of the outer tube (1), and the proximal end of the inner tube assembly (4) extends into the control handle (6) so as to control the basket electrode assembly (2) to retract or open via the control handle (6).

2. The ablation catheter according to claim 1, characterized in that, The control handle (6) includes a housing (12), a push-pull switch (7), and a transmission guide mechanism disposed within the housing (12); The proximal end of the outer tube (1) is connected to the distal end of the shell (12); The proximal end of the inner tube assembly (4) extends into the housing (12) and is connected to the transmission guide mechanism; The operating end of the push-pull switch (7) is located outside the housing (12), and the execution end of the push-pull switch (7) is connected to the transmission guide mechanism; by moving the push-pull switch (7), the basket electrode assembly (2) is controlled to retract or open.

3. The ablation catheter according to claim 2, characterized in that, The transmission guide mechanism includes a slide rail (9), a slider (8), a rack (10), and a gear (11); The slider (8) is slidably mounted on the slide rail (9) along the length of the control handle (6); The proximal end of the inner tube assembly (4) extends into the housing (12) and is connected to the slider (8); The gear (11) is rotatable around its own axis and is disposed in the housing (12). The rack (10) is meshed with the gear (11) and is connected to the slider (8). The actuating end of the push-pull switch (7) is connected to the rack (10).

4. The ablation catheter according to claim 3, characterized in that, The slider (8) is provided with a slot, and the proximal end of the inner tube assembly (4) is inserted into the slot so that the inner tube assembly (4) is connected to the slider (8).

5. The ablation catheter according to claim 3, characterized in that, The slide rail (9) is provided with a slide groove, and the slider (8) can be linearly slidably disposed in the slide groove along the axial direction of the inner tube assembly (4).

6. The ablation catheter according to claim 3, characterized in that, The push-pull switch (7) is provided with a first square boss, and the rack (10) is provided with a square countersunk hole. The first square boss is embedded in the square countersunk hole so that the push-pull switch (7) and the rack (10) are interconnected.

7. The ablation catheter according to claim 6, characterized in that, The slider (8) is provided with a second square boss, which is embedded in the square countersunk hole so that the slider (8) and the rack (10) are interconnected.

8. The ablation catheter according to claim 4, characterized in that, The gear (11) is a gear (11) with rotational damping function.

Images