Handle and ablation catheter

Abstract

This application provides a handle and an ablation catheter, belonging to the field of ablation technology. The handle, used in the ablation catheter, includes a housing, a movable component, and a sealing seat. The sealing seat is disposed within and connected to the housing. The sealing seat has a main lumen and branch lumen. The main lumen extends through both ends of the sealing seat along a first direction. The movable component is movably inserted into the main lumen along the first direction. One end of the branch lumen communicates with the main lumen to form a first junction point, and the other end of the branch lumen communicates with the main lumen to form a second junction point. Along the flow direction of the medium within the main lumen, the second junction point is located downstream of the first junction point. The flow direction of the medium within the branch lumen near the second junction point is opposite to the flow direction of the medium within the main lumen. This handle can reduce the risk of bleeding.

Description

Technical Field

[0001] This application relates to the field of ablation technology, and more specifically, to a handle and ablation catheter. Background Technology

[0002] Catheter ablation is used to treat various arrhythmias, tumors, and other conditions. The ablation catheter plays a crucial role in energy conduction and target localization during the procedure, serving as the instrument for ablation. Currently, after the movable element of the ablation catheter is inserted into the handle, the handle generally does not provide special sealing for the movable element. Alternatively, a sealing gasket may be used, but this gasket typically employs an interference fit with the movable element, making it difficult to guarantee a proper seal and leaving a risk of bleeding from the handle. Summary of the Invention

[0003] This application provides a handle and ablation catheter that can reduce the risk of bleeding from the handle.

[0004] In a first aspect, embodiments of this application provide a handle for an ablation catheter. The handle includes a housing, a movable element, and a sealing seat. The sealing seat is disposed within and connected to the housing. The interior of the sealing seat has a main lumen and a branch lumen. The main lumen extends through both ends of the sealing seat along a first direction. The movable element is movably inserted into the main lumen along the first direction. One end of the branch lumen communicates with the main lumen to form a first junction point, and the other end of the branch lumen communicates with the main lumen to form a second junction point. Along the flow direction of the medium in the main lumen, the second junction point is located downstream of the first junction point. The flow direction of the medium in the branch lumen near the second junction point is opposite to the flow direction of the medium in the main lumen.

[0005] In this design, after the movable element (e.g., the center wire) of the ablation catheter is inserted into the outer shell of the handle, a main lumen is provided through the sealing seat. In this way, the movable element is movably inserted into the main lumen along the first direction, which allows the movable element to move relative to the main lumen in the sealing seat, ensuring the mobility of the movable element. However, because the movable element is movably inserted into the main lumen, there is a gap between the movable element and the main lumen. Fluid in the body's natural cavities, such as blood in blood vessels, will flow into the sealing seat of the handle along the movable element. By setting up the branch cavity in the sealing seat, one end of the branch cavity connects with the main cavity to form a first junction point, and the other end of the branch cavity connects with the main cavity to form a second junction point. After the blood on the moving part flows to the first junction point, part of the blood continues to flow towards the second junction point along the extension direction of the main cavity, while part of the blood flows from the first junction point into the branch cavity and then flows back into the main cavity from the second junction point. Because the flow direction of the medium in the branch cavity near the second junction point is opposite to the flow direction of the medium in the main cavity, the blood flowing out of the branch cavity can offset part of the blood pressure in the main cavity, thus reducing the pressure on the blood in the main cavity and sealing the blood. This reduces the risk of blood on the moving part flowing out of the main cavity along the moving part, and can promptly block the blood near the second junction point of the main cavity, reducing the risk of blood seepage from the handle.

[0006] In some embodiments, there are multiple branch cavities, which are distributed circumferentially along the main cavity.

[0007] In the above technical solution, by setting the number of branch channels to multiple and distributing them circumferentially along the main channel, blood in the multiple branch channels can flow into the main channel from multiple directions in the outer periphery of the main channel through the second confluence point. The blood in the multiple branch channels overlaps and cooperates with each other in the circumferential direction, which has a better effect on reducing the blood pressure in the main channel. This further reduces the risk of blood on the moving part flowing out of the main channel along the moving part, and can timely block the blood near the second confluence point of the main channel, thereby reducing the risk of bleeding from the handle.

[0008] In some embodiments, there are multiple branch cavities, which are distributed at intervals along the extension direction within the main cavity.

[0009] In the above technical solution, multiple branch channels are used, and these multiple branch channels are distributed at intervals along the extension direction within the main channel. In this way, multiple branch channels can reduce the blood flowing in the main channel multiple times in the extension direction of the main channel, which has a better effect on reducing the blood pressure in the main channel. This can block the blood in the main channel of the sealing seat in a timely manner, thereby further reducing the risk of bleeding from the handle.

[0010] In some embodiments, there are two branch channels, including a first branch channel and a second branch channel. One end of the first branch channel is connected to the main channel to form a first junction point, and the other end of the first branch channel is connected to the main channel to form a second junction point. One end of the second branch channel is connected to the main channel to form a third junction point, and the other end of the second branch channel is connected to the main channel to form a fourth junction point. The first junction point, the third junction point, the second junction point, and the fourth junction point are distributed sequentially along the flow direction of the medium in the main channel.

[0011] In the above technical solution, two branch channels are used: a first branch channel and a second branch channel. The blood flowing into the main channel from the second junction point in the first branch channel provides initial pressure reduction, while the blood flowing into the main channel from the fourth junction point in the second branch channel provides a second pressure reduction. The combined effect of these two pressure reductions is even better. Furthermore, along the flow direction of the medium within the main channel, the first, third, second, and fourth junction points are sequentially distributed, with the second junction point located between the third and fourth junction points. The first and second branch channels are partially staggered along the extension direction of the main channel, meaning their positions are relatively closer. This reduces the space occupied by the two branch channels within the sealing seat along the extension direction of the main channel, facilitating the miniaturization of the sealing seat.

[0012] In some embodiments, there are two branch channels, including a first branch channel and a second branch channel. One end of the first branch channel is connected to the main channel to form a first junction point, and the other end of the first branch channel is connected to the main channel to form a second junction point. One end of the second branch channel is connected to the main channel to form a third junction point, and the other end of the second branch channel is connected to the main channel to form a fourth junction point. The first junction point, the second junction point, the third junction point, and the fourth junction point are distributed sequentially along the flow direction of the medium in the main channel.

[0013] In the above technical solution, two branch channels are used: a first branch channel and a second branch channel. Blood flowing into the main channel from the second junction point in the first branch channel provides an initial pressure reduction, while blood flowing into the main channel from the fourth junction point in the second branch channel provides a second pressure reduction. The combined effect of these two progressively decreasing pressures on the main channel is even better. Furthermore, the first, second, third, and fourth junction points are sequentially distributed along the flow direction of the medium within the main channel. The first and second branch channels are completely staggered in their extension direction within the main channel, providing more options for their distribution within the sealing seat.

[0014] In some embodiments, the branch cavity is an annular cavity arranged around the outer periphery of the main cavity.

[0015] In the above technical solution, by adopting an annular cavity structure that surrounds the outer periphery of the main cavity, the blood inlet area of ​​the annular cavity is larger and the flow area is larger than that of a single-channel cavity. After the blood flowing out of the cavity re-enters the main cavity from the second confluence point, it has a better effect on reducing the pressure of the blood in the main cavity, which can further reduce the risk of bleeding from the handle.

[0016] In some embodiments, the handle further includes a sealing gasket disposed within a sealing seat and located downstream of the second junction of the main cavity. The sealing gasket has a first through hole through which a movable member passes, and the movable member is interference-fitted with the first through hole.

[0017] In the above technical solution, a sealing gasket is provided on the downstream side of the second junction of the main cavity. The first through hole on the sealing gasket is interference-fitted with the movable part, that is, the periphery of the hole wall of the first through hole can apply a compressive force to the movable part. As a moving part, the first through hole allows the movable part to move relative to the first through hole of the sealing gasket in the first direction, ensuring the mobility of the movable part. At the same time, the friction between the hole wall of the first through hole and the movable part can keep the movable part and the hole wall of the first through hole in a relatively sealed state. On the basis of the pressure reduction and sealing of the blood in the main cavity by the branch cavity, the sealing gasket can perform a secondary superposition seal on the movable part, further reducing the risk of blood passing through the first through hole of the sealing gasket along the movable part. The anti-leakage effect is better and the risk of blood leakage from the handle is reduced.

[0018] In some embodiments, the number of sealing gaskets is multiple, and the multiple sealing gaskets are stacked and distributed along a first direction.

[0019] In the above technical solution, by using multiple sealing gaskets, stacking multiple sealing gaskets together, and having multiple sealing gaskets work together, the blood on the moving parts is sealed, and the anti-leakage effect of the handle is better.

[0020] In some embodiments, the sealing seat includes a first portion and a second portion, which are connected to compress the sealing gasket.

[0021] In the above technical solution, the sealing seat includes a first part and a second part. The sealing gasket is pressed and fixed inside the sealing seat by connecting the first part and the second part. The sealing gasket is fixed in position in the sealing seat and is not easy to move, which has a good sealing effect on blood on moving parts.

[0022] In some embodiments, a portion of the branch cavity and a portion of the main cavity are located in a first portion, and another portion of the main cavity is located in a second portion; the first portion includes a first body and a first boss, the first boss being connected to the first body, and the second portion having a cavity communicating with the main cavity, a sealing gasket being located in the cavity, the first boss being sealed to the opening of the cavity, and at least a portion of the first boss being located in the cavity to press the sealing gasket.

[0023] In the above technical solution, the second part has a cavity, and the sealing gasket is placed in the cavity of the second part. The first boss of the first part is at least partially inserted into the cavity, and the first boss presses and fixes the sealing gasket, providing a pressing effect to ensure that the sealing gasket is fixed in position within the sealing seat, thereby achieving a sealing effect on the moving part. Furthermore, the sealing fit between the first boss and the cavity opening, under the cooperation of the cavity of the second part and the first boss, forms a relatively independent closed space inside the sealing seat. Blood blocked by the sealing gasket on the moving part is more likely to be retained in the cavity and is less likely to flow out of the cavity, thus reducing the likelihood of bleeding from the handle.

[0024] In some embodiments, the first part further includes a sleeve, the sleeve and the first boss are located on opposite sides of the first body, and the outer diameter of the sleeve is smaller than the outer diameter of the first body; the main cavity is disposed through the sleeve, the first body and the first boss, and the main cavity has a flared portion formed at the end of the sleeve away from the first body.

[0025] In the above technical solution, when the moving part enters the sealing seat, it passes through the sleeve, the first part and the second part in sequence. The flared part is designed to facilitate the injection of glue from the flared part of the sleeve to bond and fix the proximal end of the middle tube of the conduit to the sleeve.

[0026] In some embodiments, the handle further includes a positioning seat and a push button. The positioning seat is movably disposed within the housing along a first direction. A movable member is disposed through the positioning seat and is fixedly connected to the positioning seat. A positioning component is disposed within the positioning seat. The push button is at least partially disposed within the housing. The push button and the positioning component have a positioning state and a separated state. When the resistance encountered by the positioning seat during movement is less than a first threshold, the push button and the positioning component are in the positioning state, and the push button drives the positioning seat to move along the first direction. When the resistance encountered by the positioning seat during movement is greater than the first threshold, the push button and the positioning component switch from the positioning state to the separated state, and the push button and the positioning seat move relative to each other along the first direction.

[0027] In the above technical solution, when the electrode stent is in the expanded state, it is in contact with the blood vessel wall. If the movable part is forcibly pulled towards the handle, the electrode stent will excessively compress the blood vessel wall, causing damage. Therefore, by setting a positioning component in the positioning seat, the push button and the positioning component are positioned and cooperated, and the push button and the positioning component have a positioning state and a disengaged state. In this way, when the resistance to the movement of the positioning seat is less than a first threshold, the push button and the positioning component are in the positioning state, and the push button can drive the positioning seat to move along the first direction to achieve normal expansion of the electrode stent. When the electrode stent has expanded to the correct position, when the sum of the pulling force required for the movement of the movable part and the resistance of the sliding of the positioning seat is greater than the first threshold, continuing to push or pull the push button will cause the push button and the positioning component to switch from the positioning state to the disengaged state. The push button and the positioning seat will move relative to each other along the first direction, the positioning seat will be stationary, the push button will not continue to move with the positioning seat, the electrode stent cannot continue to expand, and there will be no excessive traction on the electrode stent, thus protecting the blood vessel.

[0028] In some embodiments, the push button has a control rod for insertion into the positioning seat, and the positioning seat has a sliding cavity for the control rod to pass through; the positioning assembly includes a positioning member and an elastic member, the positioning seat has a mounting groove communicating with the sliding cavity, the elastic member is disposed in the mounting groove, and one end of the elastic member is connected to the positioning member so that the positioning member can extend or retract into the mounting groove; the control rod has a mating part that positions and engages with the positioning member, and when the push button and the positioning assembly are in the positioning state, the mating part is positioned and engaged with the positioning member; when the push button and the positioning assembly are in the separated state, the control rod presses the positioning member to retract the positioning member into the mounting groove, and the mating part separates from the positioning member.

[0029] In the above technical solution, the positioning component includes a positioning element and an elastic element. The positioning element can extend or retract into the mounting groove via the elastic element. When the push button and the positioning component are in the positioning state, the positioning element extends out of the mounting groove and engages with the mating part of the control rod. The control rod can pull the positioning seat to move together in the first direction, thereby expanding the electrode stent. When the electrode stent has expanded to the correct position, if the resistance encountered by the positioning seat is greater than a first threshold, this resistance causes the control rod to squeeze the positioning element, deforming the elastic element. The positioning element then retracts into the mounting groove, and the mating part separates from the positioning element. In this way, the push button will not continue to move with the positioning seat, and the electrode stent cannot continue to expand, thus preventing excessive traction on the electrode stent and protecting the blood vessel.

[0030] In some embodiments, the handle includes a guide portion disposed within the housing, and the positioning seat slides with the guide portion along a first direction.

[0031] In the above technical solution, by providing a guide part inside the handle, the guide part can guide the movement of the positioning seat, thereby improving the reliability and stability of the positioning seat during the movement process.

[0032] In some embodiments, a damping adjustment component is provided on the positioning seat, which is used to adjust the static friction between the positioning seat and the guide portion.

[0033] In the above technical solution, a damping adjustment component is provided on the positioning seat. This component can adjust the static friction force when the positioning seat slides relative to the guide. On the one hand, by reasonably adjusting the static friction force between the positioning seat and the guide, damping is generated during the expansion of the electrode support via the moving part, which is driven by the push button. This provides a better feel for the operator when pushing the push button. On the other hand, when the electrode support is expanded to the correct position for ablation, the static friction force between the positioning seat and the guide prevents the positioning seat from moving in the opposite direction, keeping the electrode support in an expanded state and ensuring the ablation effect.

[0034] In some embodiments, the damping adjustment assembly includes a mounting base, a silicone column, and a fastener. The mounting base is connected to a positioning base. The silicone column is disposed on the side of the mounting base away from the positioning base. The fastener passes through the silicone column to fix the silicone column to the mounting base. At least one side of the silicone column contacts a guide portion. The fastener is used to provide compressive force to the silicone column to adjust the amount of compressive deformation of the silicone column.

[0035] In the above technical solution, the silicone column can be installed on the mounting base using fasteners. Since the silicone column is a flexible material, at least one side of the silicone column is in contact with the guide part. When the silicone column is subjected to different extrusion forces, the amount of deformation of the silicone column is different. Thus, by adjusting the tightness of the fasteners on the silicone column, the tightness between the silicone column and the guide part can be adjusted. According to actual needs, the resistance encountered by the positioning base when sliding on the guide part can be adjusted.

[0036] In some embodiments, the damping adjustment assembly further includes two shims, which are respectively disposed on both sides of the silicone column in the thickness direction, and the fasteners deform the silicone column by squeezing the shims.

[0037] In the above technical solution, by providing gaskets on both sides of the silicone column, the fastener can act on the silicone column through the gaskets. The hardness of the gasket is greater than that of the silicone column, and the contact area between the gasket and the silicone column is larger than that of the fastener. On the one hand, this reduces the pressure of the fastener on the silicone column, making it less likely to damage the silicone column when the fastener squeezes it, thus extending the service life of the silicone column. On the other hand, the increased contact area between the fastener and the silicone column through the gasket makes the compression deformation of the silicone column more uniform, which is more conducive to achieving the compression deformation of the silicone column.

[0038] Secondly, embodiments of this application also provide an ablation catheter, which includes the handle of any of the foregoing embodiments.

[0039] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0040] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 This is a schematic diagram of the structure of the ablation catheter provided in some embodiments of this application;

[0042] Figure 2 This application provides schematic diagrams of the internal structure of the handle in some embodiments;

[0043] Figure 3 for Figure 2 Enlarged diagram of A in the middle;

[0044] Figure 4 A cross-sectional view showing the mating of a sealing seat and a movable component according to some embodiments of this application;

[0045] Figure 5 A schematic diagram of a structure in which two branch channels are circumferentially spaced along the main channel, as provided in some embodiments of this application;

[0046] Figure 6 A schematic diagram of a structure in which two branch cavities are spaced apart along the extension direction of the main cavity, as provided in some embodiments of this application;

[0047] Figure 7 A schematic diagram of a structure in which two branch channels are spaced apart along the extension direction of the main channel, as provided in some other embodiments of this application;

[0048] Figure 8 This is a schematic diagram of a structure in which the branch channel is an annular cavity, provided in some embodiments of this application;

[0049] Figure 9 for Figure 8 Schematic diagram of the cross section of AA;

[0050] Figure 10 This is a schematic diagram of the structure of the positioning seat and the push button provided in some embodiments of this application;

[0051] Figure 11 This is a cross-sectional schematic diagram showing the cooperation between the positioning seat and the push button in some embodiments of this application.

[0052] Icons: 100-Ablation catheter; 10-Catheter; 11-Outer tube; 12-Intermediate tube; 20-Electrode holder; 30-Handle; 31-Outer shell; 32-Sealing seat; 321-Main lumen; 3211-First junction; 3212-Second junction; 3213-Third junction; 3214-Fourth junction; 322-Branch lumen; 3221-First branch lumen; 3222-Second branch lumen; 33-Sealing gasket; 331-First through hole; 34-First part; 341-First body; 342-... 1. Boss; 343. Sleeve; 344. Guide tube; 35. Second part; 351. Cavity; 36. Positioning seat; 361. Positioning assembly; 3611. Positioning element; 3612. Elastic element; 362. Slide cavity; 363. Mounting groove; 37. Push button; 371. Control lever; 372. Push-pull button; 38. Guide part; 40. Damping adjustment assembly; 41. Mounting seat; 42. Silicone pillar; 43. Fastener; 44. Gasket; 50. Moving part; 51. Transition tube; 52. Tail tube; X. First direction. Detailed Implementation

[0053] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0054] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0055] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0056] In the description of the embodiments of this application, it should be noted that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this application is usually placed during use. It is only for the convenience of describing this application and simplifying the description, and does 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. Therefore, it should not be construed as a limitation on this application. In addition, the terms "first," "second," "third," etc. are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0057] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up" and "connected" 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 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 application based on the specific circumstances.

[0058] This application provides a handle; please refer to... Figures 1 to 11 The handle 30 is used for the ablation catheter 100. The handle 30 includes a housing 31, a movable member 50, and a sealing seat 32. The sealing seat 32 is disposed inside and connected to the housing 31. The interior of the sealing seat 32 has a main cavity 321 and a branch cavity 322. The main cavity 321 extends through both ends of the sealing seat 32 along a first direction X. The movable member 50 is movably inserted into the main cavity 321 along the first direction X. One end of the branch cavity 322 communicates with the main cavity 321 to form a first junction point 3211, and the other end of the branch cavity 322 communicates with the main cavity 321 to form a second junction point 3212. Along the flow direction of the medium in the main cavity 321, the second junction point 3212 is located downstream of the first junction point 3211. The flow direction of the medium in the branch cavity 322 near the second junction point 3212 is opposite to the flow direction of the medium in the main cavity 321.

[0059] In this design, after the movable element 50 (e.g., the center wire) of the ablation catheter 100 is inserted into the outer shell 31 of the handle 30, a main lumen 321 is provided through the sealing seat 32. Thus, the movable element 50 is movably inserted into the main lumen 321 along the first direction X, allowing the movable element 50 to move relative to the main lumen 321 within the sealing seat 32, ensuring the mobility of the movable element 50. However, because the movable element 50 is movably inserted into the main lumen 321, there is a gap between the movable element 50 and the main lumen 321. Fluid in the body's natural cavities, such as blood in blood vessels, will flow along the movable element 50 into the sealing seat 32 of the handle 30. Through the setting of the branch cavity 322 in the sealing seat 32, one end of the branch cavity 322 is connected to the main cavity 321 to form a first junction point 3211, and the other end of the branch cavity 322 is connected to the main cavity 321 to form a second junction point 3212. After the blood on the movable part 50 flows to the first junction point 3211, a part of the blood continues to flow towards the second junction point 3212 along the extension direction of the main cavity 321, and a part of the blood flows from the first junction point 3211 into the branch cavity 322 and flows back to the main cavity 321 from the second junction point 3212. Because the flow direction of the medium in the branch channel 322 near the second junction point 3212 is opposite to the flow direction of the medium in the main channel 321, the blood flowing out of the branch channel 322 can offset part of the blood pressure in the main channel 321, thereby reducing the pressure of the blood in the main channel 321 and sealing the blood. This reduces the risk of blood on the moving part 50 flowing out of the main channel 321 along the moving part 50, and can promptly block the blood near the second junction point 3212 of the main channel 321, reducing the risk of blood seepage from the handle 30.

[0060] The following embodiments are described in a non-limiting manner based on radiofrequency ablation. Those skilled in the art will understand that the following descriptions are merely exemplary, and similarly, the ablation catheter 100 provided in this application can be adapted to other ablation scenarios such as ultrasound ablation, laser ablation, cryoablation, and chemical ablation after being adapted based on the application scenario.

[0061] The ablation catheter 100 generally includes a handle 30, a catheter 10, and an electrode holder 20. The handle 30 is connected to the proximal end of the catheter 10, and the electrode holder 20 is located at the distal end of the catheter 10.

[0062] A movable element 50 and a lead wire can be inserted into the catheter 10. The movable element 50 refers to a component of the ablation catheter 100 that can move along the axial direction of the catheter 10. The movable element 50 can be a central wire that drives the deformation of the electrode stent 20. The proximal end of the movable element 50 is inserted into and connected to the handle 30, and the distal end of the movable element 50 is connected to the electrode stent 20. The movement of the movable element 50 can control the switching of the electrode stent 20 between an expanded state and a contracted state. When the electrode stent 20 is in the expanded state, the effector of the electrode stent 20 contacts the blood vessel wall, realizing the ablation function.

[0063] The lead wire is the wiring between the effect device and / or monitoring component on the electrode holder 20 and the ablation device. The effect device refers to the component on the electrode holder 20 that can perform the ablation function; the effect device can be an electrode or an ultrasonic transducer, etc. The monitoring component refers to the monitoring component that can monitor the ablation process. The lead wire is electrically connected to the effect device and / or monitoring component on the electrode holder 20. The lead wire can be electrically connected to the effect device on the electrode holder 20, or it can be electrically connected to both the effect device and the monitoring component.

[0064] The monitoring components may include a temperature sensor and / or a pressure sensor. The temperature sensor monitors the ablation temperature of the ablation zone, and the pressure sensor monitors the adhesion of the electrode holder 20 to the wall. There may be multiple effect devices, which are spaced apart circumferentially and / or axially on the electrode holder 20. There may also be multiple wires.

[0065] Specifically, the catheter 10 includes an outer tube 11 and an intermediate tube 12. The distal end of the outer tube 11 is fixedly connected to the electrode holder 20, and the proximal end of the outer tube 11 passes through the handle 30 and is fixedly connected to the handle 30. The intermediate tube 12 is located between the outer tube 11 and the movable member 50. The distal end of the intermediate tube 12 is bonded and fixed to the outer tube 11, and the proximal end of the intermediate tube 12 is fixedly connected to the sealing seat 32. The length of the intermediate tube 12 is less than the length of the movable member 50. The end of the intermediate tube 12 is fixedly connected to the sealing seat 32, and the movable member 50 passes through both axial ends of the main cavity 321 of the sealing seat 32. The gap between the intermediate tube 12 and the outer tube 11 allows for the passage of a wire, while the movable member 50 passes through the lumen of the intermediate tube 12. In this way, the movable member 50 and the wire are located in different cavities. When the movable member 50 moves relative to the catheter 10, the movable member 50 only moves relative to the intermediate tube 12 and does not rub against the wire. There is a gap between the movable member 50 and the inner wall of the intermediate tube 12 to allow the movable member 50 to move in the first direction X. After the electrode holder 20 is inserted into the blood vessel, blood can flow into the cavity of the intermediate tube 12 through the gap between the electrode holder 20, the intermediate tube 12 and the movable member 50, and then flow into the sealing seat 32 of the handle 30 along the movable member 50.

[0066] In some embodiments, please refer to Figure 5 There are multiple branch cavities 322, which are distributed circumferentially along the main cavity 321.

[0067] The number of branch channels 322 can be two, three, or four. For example, when there are two branch channels 322, the two branch channels 322 can be symmetrically distributed on opposite sides of the main channel 321, or they can be asymmetrically distributed, depending on the actual situation.

[0068] By setting the number of branch channels 322 to multiple, and distributing the multiple branch channels 322 circumferentially along the main channel 321, the blood in the multiple branch channels 322 can flow into the main channel 321 from multiple directions in the outer periphery of the main channel 321 through the second confluence point 3212. The blood in the multiple branch channels 322 overlaps and cooperates with each other in the circumferential direction, which has a better effect on reducing the blood pressure in the main channel 321. This further reduces the risk of blood on the moving part 50 flowing out of the main channel 321 along the moving part 50. It can block the blood in time near the second confluence point 3212 of the main channel 321, thereby reducing the risk of bleeding from the handle 30.

[0069] In some embodiments, please refer to Figure 6 and Figure 7 There are multiple branch cavities 322, which are distributed at intervals along the extension direction within the main cavity 321.

[0070] Multiple branch cavities 322 are distributed at intervals along the extension direction within the main cavity 321. The extension direction of the main cavity 321 can be understood as the length direction of the main cavity 321. Multiple branch cavities 322 are distributed at intervals along the length direction of the main cavity 321. The blood flowing out of each branch cavity 322 can reduce the pressure of the blood in the main cavity 321.

[0071] The number of branch channels 322 is multiple, and the multiple branch channels 322 are distributed at intervals along the extension direction of the main channel 321. In this way, the multiple branch channels 322 can reduce the blood flowing in the main channel 321 in multiple stages along the extension direction of the main channel 321, which has a better effect on reducing the blood pressure in the main channel 321. It can block the blood in the main channel 321 of the sealing seat 32 in a timely manner, thereby further reducing the risk of bleeding from the handle 30.

[0072] In some embodiments, please refer to Figure 6There are two branch channels 322, including a first branch channel 3221 and a second branch channel 3222. One end of the first branch channel 3221 is connected to the main channel 321 to form a first junction point 3211, and the other end of the first branch channel 3221 is connected to the main channel 321 to form a second junction point 3212. One end of the second branch channel 3222 is connected to the main channel 321 to form a third junction point 3213, and the other end of the second branch channel 3222 is connected to the main channel 321 to form a fourth junction point 3214. The first junction point 3211, the third junction point 3213, the second junction point 3212 and the fourth junction point 3214 are distributed sequentially along the flow direction of the medium in the main channel 321.

[0073] The number of branch channels 322 is two, namely the first branch channel 3221 and the second branch channel 3222. The blood flowing into the main channel 321 from the second junction point 3212 in the first branch channel 3221 can reduce the pressure of the blood in the main channel 321 for the first time. The blood flowing into the main channel 321 from the fourth junction point 3214 in the second branch channel 322 can reduce the pressure of the blood in the main channel 321 for the second time. The pressure reduction effect of the two pressure reductions is better when they are combined. Furthermore, along the flow direction of the medium within the main cavity 321, the first junction point 3211, the third junction point 3213, the second junction point 3212, and the fourth junction point 3214 are distributed sequentially. The second junction point 3212 is located between the third junction point 3213 and the fourth junction point 3214. The first branch cavity 3221 and the second branch cavity 3222 are partially staggered in the extension direction of the main cavity 321. That is, the positions of the first branch cavity 3221 and the second branch cavity 3222 in the extension direction of the main cavity 321 are relatively closer, which can reduce the space occupied by the two branch cavities 322 in the extension direction of the main cavity 321, and is more conducive to the miniaturization of the sealing seat 32.

[0074] In some embodiments, please refer to Figure 7 There are two branch channels 322, including a first branch channel 3221 and a second branch channel 3222. One end of the first branch channel 3221 is connected to the main channel 321 to form a first junction point 3211, and the other end of the first branch channel 3221 is connected to the main channel 321 to form a second junction point 3212. One end of the second branch channel 3222 is connected to the main channel 321 to form a third junction point 3213, and the other end of the second branch channel 3222 is connected to the main channel 321 to form a fourth junction point 3214. The first junction point 3211, the second junction point 3212, the third junction point 3213 and the fourth junction point 3214 are distributed sequentially along the flow direction of the medium in the main channel 321.

[0075] The number of branch channels 322 is two, namely the first branch channel 3221 and the second branch channel 3222. The blood flowing into the main channel 321 from the second junction point 3212 in the first branch channel 3221 can reduce the pressure of the blood in the main channel 321 for the first time. The blood flowing into the main channel 321 from the fourth junction point 3214 in the second branch channel 322 can reduce the pressure of the blood in the main channel 321 for the second time. The pressure reduction effect of the two step-by-step reductions is better after superimposing. Furthermore, along the flow direction of the medium in the main cavity 321, the first junction point 3211, the second junction point 3212, the third junction point 3213, and the fourth junction point 3214 are distributed sequentially, and the first branch cavity 3221 and the second branch cavity 3222 are completely staggered in the extension direction of the main cavity 321, providing more options for the distribution of the first branch cavity 3221 and the second branch cavity 3222 in the sealing seat 32.

[0076] In some embodiments, please refer to Figure 8 and Figure 9 The branch channel 322 is an annular cavity surrounding the outer periphery of the main channel 321. By adopting an annular cavity structure surrounding the outer periphery of the main channel 321, the blood inlet area and flow area of ​​the annular branch channel 322 are larger than those of a single-channel branch channel 322. After the blood flowing out of the branch channel 322 re-enters the main channel 321 from the second confluence point 3212, it has a better pressure reduction effect on the blood in the main channel 321, which can further reduce the risk of bleeding from the handle 30.

[0077] In some embodiments, please refer to Figure 4 The handle 30 also includes a sealing gasket 33, which is disposed in the sealing seat 32 and is located on the downstream side of the second junction point 3212 of the main cavity 321. The sealing gasket 33 has a first through hole 331 through which the movable member 50 passes, and the movable member 50 is interference-fitted with the first through hole 331.

[0078] The first through hole 331 refers to a through-hole structure on the sealing gasket through which the movable part 50 can pass. The interference fit between the movable part 50 and the first through hole 331 can be achieved in various ways. For example, the edge of the hole 331 of the sealing gasket 33 can be partially made of flexible material, allowing the interference fit with the movable part 50 through the flexible deformation of the first through hole 331. Alternatively, a flexible sealing gasket can be provided around the hole of the first through hole 331 of the sealing gasket 33, allowing the interference fit with the movable part 50 and the sealing gasket 33 through the deformation of the sealing gasket 33. Of course, the sealing gasket 33 can also be made entirely of flexible material, utilizing the deformation capability of the sealing gasket 33 to give the hole of the first through hole 331 deformation capability, thereby achieving an interference fit with the movable part 50.

[0079] For example, the sealing gasket 33 is made of a flexible material. The material of the sealing gasket 33 can be various, such as rubber or silicone.

[0080] The number of sealing gaskets 33 can be one, two, or three, and the specific number of sealing gaskets 33 can be determined according to the actual situation. In this embodiment, the material of the sealing gasket 33 is liquid silicone, and the number of sealing gaskets 33 is one.

[0081] By providing a sealing gasket 33 on the downstream side of the second intersection point 3212 of the main cavity 321, and the interference fit between the first through hole 331 on the sealing gasket 33 and the movable part 50, that is, the periphery of the hole wall of the first through hole 331 can apply a compressive force to the movable part 50. As a moving part, the first through hole 331 allows the movable part 50 to move relative to the first through hole 331 of the sealing gasket 33 in the first direction X, ensuring the mobility of the movable part 50. At the same time, the friction between the hole wall of the first through hole 331 and the movable part 50 can keep the movable part 50 and the hole wall of the first through hole 331 in a relatively sealed state. On the basis of the pressure reduction and sealing of the blood in the main cavity 321 by the branch cavity 322, the sealing gasket 33 can provide a secondary superposition seal for the movable part 50, further reducing the risk of blood flowing through the first through hole 331 of the sealing gasket 33 along the movable part 50. The anti-leakage effect is better, and the risk of blood leakage from the handle 30 is reduced.

[0082] In some embodiments, the number of sealing gaskets 33 is multiple, and the multiple sealing gaskets 33 are stacked and distributed along the first direction X.

[0083] The number of sealing gaskets 33 is multiple, which means that the number of sealing gaskets 33 can be two, three or four, etc. The specific number of sealing gaskets 33 can be determined according to the actual situation.

[0084] By using multiple sealing gaskets 33, which are stacked and work together, the blood on the moving part 50 is sealed, and the handle 30 is better protected against blood leakage.

[0085] In some embodiments, please continue to refer to Figure 4 The sealing seat 32 includes a first part 34 and a second part 35, which are connected to press the sealing gasket 33 together.

[0086] There are several ways to connect the first part 34 and the second part 35. The first part 34 and the second part 35 can be connected by a thread, or they can be connected by a snap-fit.

[0087] When the first part 34 and the second part 35 are connected by a threaded connection, one of the first part 34 and the second part 35 is provided with an internal thread, and the other can be provided with an external thread. The first part 34 and the second part 35 are connected by a threaded connection to achieve the compression and fixation of the sealing gasket 33.

[0088] When the first part 34 and the second part 35 are connected by a snap-fit ​​method, the first part 34 and the second part 35 can be connected by a pressing process, which provides a pre-tightening effect to the sealing gasket 33, so that the sealing gasket 33 is better positioned in the sealing seat 32, and the blood blocking effect is better.

[0089] The sealing seat 32 includes a first part 34 and a second part 35. The first part 34 and the second part 35 are connected to press and fix the sealing gasket 33 inside the sealing seat 32. The sealing gasket 33 is fixed in position in the sealing seat 32 and is not easy to move, which has a good sealing effect on the blood on the moving part 50.

[0090] In some embodiments, please refer to Figure 4 A portion of the branch cavity 322 and the main cavity 321 are located in the first part 34, and another portion of the main cavity 321 is located in the second part 35. The first part 34 includes a first body 341 and a first boss 342, the first boss 342 being connected to the first body 341. The second part 35 has a cavity 351 communicating with the main cavity 321. A sealing gasket is located in the cavity 351. The first boss 342 is sealed to the opening of the cavity 351, and at least a portion of the first boss 342 is located in the cavity 351 to press the sealing gasket 33.

[0091] The first part 34 and the second part 35 are pressed together, and at least a portion of the first boss 342 is located in the cavity 351. The first boss 342 is inserted into the cavity 351 from the opening of the cavity 351, which plays a role in pressing and fixing the sealing gasket 33.

[0092] Of course, the end face of the first boss 342 and the cavity wall of the cavity 351 can be reinforced by adhesive bonding, so as to achieve the bonding and fixation of the first part 34 and the second part 35.

[0093] In order to improve the positioning effect of the sealing gasket 33, the bottom wall of the cavity 351 can be recessed to form a positioning groove. The sealing gasket is placed in the positioning groove, and the end face of the first boss 342 away from the first body 341 abuts against the groove opening of the positioning groove, so that the sealing gasket 33 is confined in the positioning groove.

[0094] The second part 35 has a cavity 351. A sealing gasket 33 is placed in the cavity 351 of the second part 35. The first boss 342 of the first part 34 is at least partially inserted into the cavity 351, pressing and fixing the sealing gasket 33. The first boss 342 provides a pressing effect to the sealing gasket 33, ensuring that the sealing gasket 33 is fixed in position within the sealing seat 32, thereby achieving a sealing effect on the moving part 50. Furthermore, the sealing fit between the first boss 342 and the opening of the cavity 351, combined with the action of the cavity 351 of the second part 35 and the first boss 342, forms a relatively independent closed space inside the sealing seat 32. Blood blocked by the sealing gasket 33 on the moving part 50 is more likely to be retained in the cavity 351 and is less likely to flow out of the cavity 351, thus reducing the likelihood of bleeding from the handle 30.

[0095] In some embodiments, please refer to Figure 4 The first part 34 also includes a sleeve 343, the sleeve 343 and the first boss 342 are located on opposite sides of the first body 341 respectively, and the outer diameter of the sleeve 343 is smaller than the outer diameter of the first body 341; the main cavity 321 is provided through the sleeve 343, the first body 341 and the first boss 342, and the main cavity 321 has a flared part at the end of the sleeve 343 away from the first body 341.

[0096] After the intermediate tube 12 and the movable part 50 are inserted into the sealing seat 32, the proximal end of the intermediate tube 12 is connected and fixed to the sleeve 343. After the movable part 50 passes through the sleeve 343, it continues to pass through the first part 34 and the second part 35. That is, the proximal end of the intermediate tube 12 is stopped by the sleeve 343 of the sealing seat 32.

[0097] When the movable part 50 enters the sealing seat 32, it passes through the sleeve 343, the first part 34 and the second part 35 in sequence. The flared part makes it easy to inject glue from the flared part of the sleeve 343 to bond and fix the proximal end of the middle tube 12 of the conduit 10 to the sleeve 343.

[0098] In some embodiments, please refer to Figure 10 and Figure 11The handle 30 also includes a positioning seat 36 and a push button 37. The positioning seat 36 is movably disposed within the housing 31 along the first direction X. A movable member 50 is disposed through the positioning seat 36 and is fixedly connected to the positioning seat 36. A positioning component 361 is disposed within the positioning seat 36. The push button 37 is at least partially disposed within the housing 31. The push button 37 and the positioning component 361 have a positioning state and a separated state. When the resistance encountered by the positioning seat 36 in moving is less than a first threshold, the push button 37 and the positioning component 361 are in the positioning state, and the push button 37 drives the positioning seat 36 to move along the first direction X. When the resistance encountered by the positioning seat 36 in moving is greater than the first threshold, the push button 37 and the positioning component 361 switch from the positioning state to the separated state, and the push button 37 and the positioning seat 36 move relative to each other along the first direction X.

[0099] It should be noted that the distal end of the movable member 50 is connected to the electrode holder 20. The movable member 50 moves along the first direction X, which can realize the contraction and expansion of the electrode holder 20. When the movable member 50 moves along the first direction X toward the handle 30, the movable member 50 pulls the distal end of the electrode holder 20, causing the electrode holder 20 to switch from the contracted state to the expanded state.

[0100] Since the distal end of the movable part 50 is connected to the electrode support 20 and the proximal end of the movable part 50 is fixedly connected to the positioning seat 36, the resistance encountered when the positioning seat 36 moves is the sum of the pulling force on the movable part 50 and the resistance encountered when the positioning seat 36 slides.

[0101] The first threshold is not less than the sum of the pulling force required for the movable part 50 to pull the electrode stent 20 to expand normally and the resistance encountered when the positioning seat 36 slides. The specific value of the first threshold can be determined according to the actual situation. Understandably, the first threshold is also the critical force for the push button 37 to separate from the positioning component 361. When the resistance encountered by the positioning seat 36 in moving is greater than the first threshold, it indicates that the electrode stent 20 has expanded into place and is in contact with the blood vessel wall. The electrode stent 20 cannot continue to expand. This resistance is greater than the bonding force between the positioning component 361 and the push button 37, thereby causing the push button 37 and the positioning component 361 to switch from the bonded state to the separated state. In this way, even if the push button 37 is pulled continuously, the push button 37 will not drive the positioning seat 36 and the movable part 50 to move, and the electrode stent 20 will not over-expand, thus protecting the blood vessel. The positioning component 361 can be a variety of positioning structures. For example, the positioning component 361 can include a magnet, while the push button 37 can be a metal part, and the magnetic attraction force between the magnet and the push button 37 is the first threshold. The push button 37 is magnetically attracted to the magnet in the positioning assembly 361, thereby driving the positioning seat 36 to move together. When the resistance encountered by the positioning seat 36 in moving is greater than a first threshold, the push button 37 separates from the magnet in the positioning assembly 361, and the push button 37 continues to move in the first direction X, without driving the positioning seat 36 to move. Of course, the positioning assembly 361 can also be an elastic element 3612 and a positioning element 3611, which will be described in detail in the following embodiments, and will not be elaborated further here.

[0102] When the electrode stent 20 is in the expanded state, it is in contact with the blood vessel wall. If the movable part 50 is forcibly pulled towards the handle 30, the electrode stent 20 will excessively compress the blood vessel wall, causing damage to the blood vessel. Therefore, by providing a positioning component 361 in the positioning seat 36, the push button 37 is positioned and engaged with the positioning component 361, and the push button 37 and the positioning component 361 have a positioning state and a disengaged state. In this way, when the resistance encountered by the positioning seat 36 in moving is less than a first threshold, the push button 37 and the positioning component 361 are in the positioning state, and the push button 37 can drive the positioning seat 36 to move along the first direction X, realizing the normal expansion of the electrode stent 20. When the electrode stent 20 expands to its full extent, the sum of the pulling force required for the movement of the movable part 50 and the resistance of the sliding of the positioning seat 36 exceeds the first threshold. If the push button 37 is pushed and pulled further, the push button 37 and the positioning component 361 will switch from the positioning state to the separation state. The push button 37 and the positioning seat 36 will move relative to each other along the first direction X. The positioning seat 36 will be stationary, and the push button 37 will not continue to move with the positioning seat 36. The electrode stent 20 cannot continue to expand and will not be overstretched, thus protecting the blood vessel.

[0103] In some embodiments, please refer to Figure 10 and Figure 11The push button 37 has a control rod 371 for insertion into the positioning seat 36. The positioning seat 36 has a sliding cavity 362 for the control rod 371 to pass through. The positioning assembly 361 includes a positioning member 3611 and an elastic member 3612. The positioning seat 36 has a mounting groove 363 communicating with the sliding cavity 362. The elastic member 3612 is disposed in the mounting groove 363. One end of the elastic member 3612 is connected to the positioning member 3611 so that the positioning member 3611 can extend or retract into the mounting groove 363. The control rod 371 has a mating part that positions and engages with the positioning member 3611. When the push button 37 and the positioning assembly 361 are in the positioning state, the mating part is positioned and engaged with the positioning member 3611. When the push button 37 and the positioning assembly 361 are in the separated state, the control rod 371 presses the positioning member 3611, causing the positioning member 3611 to retract into the mounting groove 363, and the mating part separates from the positioning member 3611.

[0104] The positioning element 3611 can be a positioning bead, and the mating part refers to the mating structure on the control lever 371 that can mate with the positioning element 3611. For example, the mating part can be a positioning groove that accommodates a portion of the positioning bead, with a portion of the positioning bead embedded in the positioning groove.

[0105] When the electrode stent 20 is in the contracted state, the control rod 371 moves the positioning seat 36 and the positioning bead together by pushing and pulling the push button 37, thereby expanding the electrode stent 20. When the electrode stent 20 expands to fit against the blood vessel wall, the blood vessel exerts a compressive force on the electrode stent 20, and the expansion force required for the electrode stent 20 to continue expanding increases. Under the reaction force, the control rod 371 compresses the positioning member 3611. When the expansion force of the electrode stent 20 reaches a preset first threshold, the limiting function of the mating part on the positioning member 3611 and the control rod 371 fails, the control rod 371 separates from the positioning member 3611, and the control rod 371 can no longer move the positioning seat 36 and the positioning member 3611. Consequently, the electrode stent 20 can no longer expand, thus protecting the blood vessel.

[0106] The push button 37 is connected to a push-pull button 372, which is located outside the housing 31 and can be operated by the user. The user moves the push button 37 by sliding the push-pull button 372.

[0107] A guide tube 344 is also provided on the side of the sealing seat 32 near the positioning seat 36. After the movable part 50 passes through the sealing seat 32, it is connected to the positioning seat 36 through the guide tube 344. The guide tube 344 can support and guide the movable part 50. In addition, the movable part 50 that enters the handle 30 can be wrapped with a rigid tube to ensure its rigidity.

[0108] After the movable part 50 passes through the positioning seat 36, the tail of the movable part 50 is also connected to the transition tube 51 and the tail tube 52 with Luer connector. The tail tube 52 communicates with the inner cavity of the movable part 50 and can be used to guide the guide wire, and to deliver contrast agents, saline or other therapeutic drugs.

[0109] The positioning component 361 includes a positioning element 3611 and an elastic element 3612. The positioning element 3611 can extend or retract into the mounting groove 363 via the elastic element 3612. When the push button 37 and the positioning component 361 are in the positioning state, the positioning element 3611 extends out of the mounting groove 363 and is positioned and engaged with the mating part of the control rod 371. The control rod 371 can pull the positioning seat 36 to move together in the first direction X, thereby expanding the electrode support 20. When the electrode support 20 has expanded to the correct position, if the resistance encountered by the positioning seat 36 in moving is greater than a first threshold, this resistance can cause the control rod 371 to squeeze the positioning element 3611, deforming the elastic element 3612. The positioning element 3611 then retracts into the mounting groove 363, and the mating part separates from the positioning element 3611. In this way, the push button 37 will not continue to move with the positioning seat 36, and the electrode support 20 will not continue to expand, thus preventing excessive traction on the electrode support 20 and protecting the blood vessel.

[0110] In some embodiments, please combine Figure 2 , Figure 10 and Figure 11 The handle 30 includes a guide portion 38, which is disposed inside the housing 31. The positioning seat 36 slides with the guide portion 38 along the first direction X.

[0111] The guide portion 38 can be a guide rail or a sliding groove, etc. In this embodiment, the guide portion 38 is a guide rail, and the positioning seat 36 has a guide groove that slides with the guide portion 38.

[0112] By providing a guide part 38 inside the handle 30, the guide part 38 can guide the movement of the positioning seat 36, thereby improving the reliability and stability of the positioning seat 36 during its movement.

[0113] In some embodiments, a damping adjustment component 40 is provided on the positioning seat 36, which is used to adjust the static friction between the positioning seat 36 and the guide portion 38.

[0114] The damping adjustment component 40 refers to an adjustment mechanism that can adjust the friction between the positioning seat 36 and the guide part 38. For example, it can adjust the tightness of the contact between the guide part 38 and the positioning seat 36, or select positioning seats 36 or guide parts 38 of different materials, etc., to achieve the adjustment of static friction between positioning seats 36 and guide parts 38.

[0115] By providing a damping adjustment component 40 on the positioning seat 36, the damping adjustment component 40 can adjust the static friction force when the positioning seat 36 slides relative to the guide part 38. On the one hand, by reasonably adjusting the static friction force between the positioning seat 36 and the guide part 38, damping can be generated during the process of the push button 37 driving the positioning seat 36 to move, thereby driving the electrode support 20 to expand through the movable part 50. This provides a better feel for the operator when pushing the push button 37. On the other hand, when the electrode support 20 expands to the position for ablation, the static friction force between the positioning seat 36 and the guide part 38 can prevent the positioning seat 36 from moving in the opposite direction, keeping the electrode support 20 in the expanded state and ensuring the ablation effect.

[0116] In some embodiments, please refer to Figure 10 The damping adjustment assembly 40 includes a mounting base 41, a silicone pillar 42, and a fastener 43. The mounting base 41 is connected to the positioning base 36. The silicone pillar 42 is located on the side of the mounting base 41 away from the positioning base 36. The fastener 43 passes through the silicone pillar 42 to fix the silicone pillar 42 to the mounting base 41. At least one side of the silicone pillar 42 contacts the guide portion 38. The fastener 43 is used to provide compressive force to the silicone pillar 42 to adjust the amount of compressive deformation of the silicone pillar 42.

[0117] The fastener 43 can be a screw. Both the silicone pillar 42 and the mounting base 41 have connecting holes for the fastener 43 to pass through. After the fastener 43 passes through the connecting holes in the silicone pillar 42 and the mounting base 41, the silicone pillar 42 is fixed to the mounting base 41. By adjusting the number of rotations of the fastener 43, the amount of compression deformation of the silicone pillar 42 by the fastener 43 can be adjusted, thereby adjusting the static friction between the positioning seat 36 and the guide portion 38. For example, the greater the compressive force applied by the fastener 43 to the silicone pillar 42, the greater the deformation of the silicone pillar 42, the tighter the contact between the silicone pillar 42 and the guide portion 38, and the greater the static friction. Conversely, the smaller the compressive force applied by the fastener 43 to the silicone pillar 42, the smaller the deformation of the silicone pillar 42, the looser the contact between the silicone pillar 42 and the guide portion 38, and the lower the static friction.

[0118] The silicone pillar 42 can be installed on the mounting base 41 by fastener 43. Since the silicone pillar 42 is made of flexible material, at least one side of the silicone pillar 42 is in contact with the guide part 38. When the silicone pillar 42 is subjected to different extrusion forces, the amount of deformation of the silicone pillar 42 is different. Thus, by adjusting the tightness of the fastener 43 on the silicone pillar 42, the tightness between the silicone pillar 42 and the guide part 38 can be adjusted. According to actual needs, the resistance experienced by the positioning base 36 when sliding on the guide part 38 can be adjusted.

[0119] In some embodiments, the damping adjustment assembly 40 further includes two shims 44, which are respectively disposed on both sides of the silicone column 42 in the thickness direction, and the fastener 43 deforms the silicone column 42 by squeezing it through the shims 44.

[0120] The hardness of the gasket 44 is greater than that of the silicone pillar 42. The gasket 44 can be made of metal. The gasket 44 covers one side of the silicone pillar 42 in the thickness direction. The fastener 43 acts on the silicone pillar 42 through the gasket 44 and compresses the silicone pillar 42 to cause deformation.

[0121] By providing gaskets 44 on both sides of the silicone pillar 42, the fastener 43 can act on the silicone pillar 42 through the gaskets 44. The hardness of the gaskets 44 is greater than that of the silicone pillar 42, and the contact area between the gaskets 44 and the silicone pillar 42 is larger than that between the fastener 43 and the silicone pillar 42. On the one hand, this reduces the pressure of the fastener 43 on the silicone pillar 42, making it less likely to damage the silicone pillar 42 when the fastener 43 compresses it, thus extending the service life of the silicone pillar 42. On the other hand, the increased contact area between the fastener 43 and the silicone pillar 42 through the gaskets 44 makes the compression deformation of the silicone pillar 42 more uniform and facilitates the compression deformation of the silicone pillar 42.

[0122] This application also provides an ablation catheter 100, which includes the handle 30 of any of the foregoing embodiments.

[0123] It should be noted that, where there is no conflict, the features in the embodiments of this application can be combined with each other.

[0124] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A handle for an ablation catheter, characterized in that, include: shell; Active items; A sealing seat is disposed within and connected to the housing. The sealing seat has a main cavity and a branch cavity. The main cavity extends through both ends of the sealing seat along a first direction. The movable member is movably disposed through the main cavity along the first direction. One end of the branch cavity communicates with the main cavity to form a first junction point, and the other end of the branch cavity communicates with the main cavity to form a second junction point. Along the flow direction of the medium in the main cavity, the second junction point is located downstream of the first junction point. A positioning seat is movably disposed within the housing along the first direction, the movable member is disposed through the positioning seat and is fixedly connected to the positioning seat, and a positioning component is disposed inside the positioning seat; A push button is at least partially disposed within the housing, and the push button has a positioning state and a separated state with the positioning component; The push button has a control rod for insertion into the positioning seat, and the positioning seat has a sliding cavity for the control rod to pass through. The positioning component includes a positioning element and an elastic element. The positioning seat is provided with a mounting groove communicating with the sliding cavity. The elastic element is disposed in the mounting groove, and one end of the elastic element is connected to the positioning element so that the positioning element can extend or retract into the mounting groove. The control lever has a mating part that engages with the positioning member. When the push button and the positioning assembly are in the positioning state, the mating part engages with the positioning member. When the push button and the positioning assembly are in the disengaged state, the control lever presses the positioning member to retract it into the mounting groove, and the mating part separates from the positioning member. The handle includes a guide portion disposed within the housing, and the positioning seat slides in cooperation with the guide portion along the first direction; the positioning seat is provided with a damping adjustment component, which is used to adjust the static friction between the positioning seat and the guide portion; The damping adjustment assembly includes a mounting base, a silicone pillar, a fastener, and two gaskets. The mounting base is connected to the positioning base. The silicone pillar is disposed on the side of the mounting base away from the positioning base. The fastener passes through the silicone pillar to fix the silicone pillar to the mounting base. At least one side of the silicone pillar contacts the guide portion. The fastener is used to provide compressive force to the silicone pillar to adjust the amount of compression deformation of the silicone pillar. The two gaskets are respectively disposed on both sides of the silicone pillar in the thickness direction. The fastener compresses the silicone pillar through the gaskets to deform it. The hardness of the gaskets is greater than that of the silicone pillar. In this case, the flow direction of the medium in the branch cavity near the second junction point is opposite to the flow direction of the medium in the main cavity.

2. The handle according to claim 1, characterized in that, The number of branch channels is multiple, and the multiple branch channels are distributed at intervals along the circumference of the main channel.

3. The handle according to claim 1, characterized in that, The number of branch cavities is multiple, and the multiple branch cavities are distributed at intervals along the extension direction within the main cavity.

4. The handle according to claim 3, characterized in that, The number of branch channels is two, including a first branch channel and a second branch channel. One end of the first branch channel is connected to the main channel to form the first junction point, and the other end of the first branch channel is connected to the main channel to form the second junction point. One end of the second branch cavity is connected to the main cavity to form a third junction point, and the other end of the second branch cavity is connected to the main cavity to form a fourth junction point; Along the flow direction of the medium within the main cavity, the first junction point, the third junction point, the second junction point, and the fourth junction point are distributed sequentially.

5. The handle according to claim 3, characterized in that, The number of branch channels is two, including a first branch channel and a second branch channel. One end of the first branch channel is connected to the main channel to form the first junction point, and the other end of the first branch channel is connected to the main channel to form the second junction point. One end of the second branch cavity is connected to the main cavity to form a third junction point, and the other end of the second branch cavity is connected to the main cavity to form a fourth junction point; Along the flow direction of the medium within the main cavity, the first junction point, the second junction point, the third junction point, and the fourth junction point are distributed sequentially.

6. The handle according to claim 1, characterized in that, The branch cavity is an annular cavity arranged around the outer periphery of the main cavity.

7. The handle according to any one of claims 1-6, characterized in that, The handle also includes: A sealing gasket is disposed within the sealing seat and located downstream of the second junction point of the main cavity. The sealing gasket has a first through hole through which the movable member passes, and the movable member is interference-fitted with the first through hole.

8. The handle according to claim 7, characterized in that, The number of sealing gaskets is multiple, and the multiple sealing gaskets are stacked and distributed along the first direction.

9. The handle according to claim 7, characterized in that, The sealing seat includes a first part and a second part, which are connected to press the sealing gasket together.

10. The handle according to claim 9, characterized in that, The branch cavity and a portion of the main cavity are located in the first part, and the other portion of the main cavity is located in the second part; The first part includes a first body and a first boss, the first boss being connected to the first body. The second part has a cavity communicating with the main cavity, the sealing gasket being located in the cavity, the first boss being sealed to the opening of the cavity, and at least a portion of the first boss being located in the cavity to press the sealing gasket tightly.

11. The handle according to claim 10, characterized in that, The first part further includes a sleeve, the sleeve and the first boss are respectively located on opposite sides of the first body, and the outer diameter of the sleeve is smaller than the outer diameter of the first body; The main cavity is disposed through the sleeve, the first body and the first boss, and the main cavity has a flared portion formed at the end of the sleeve away from the first body.

12. The handle according to claim 1, characterized in that, When the resistance encountered by the positioning seat during movement is less than a first threshold, the push button and the positioning component are in the positioning state, and the push button drives the positioning seat to move along the first direction; when the resistance encountered by the positioning seat during movement is greater than the first threshold, the push button and the positioning component switch from the positioning state to the separation state, and the push button and the positioning seat move relative to each other along the first direction.

13. An ablation catheter, characterized in that, Includes the handle according to any one of claims 1-12.

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