Control handle for radiofrequency ablation catheter and radiofrequency ablation catheter

Abstract

The present application provides a control handle for a radiofrequency ablation catheter and a radiofrequency ablation catheter. The control handle for the radiofrequency ablation catheter comprises: an outer shell, the interior of the outer shell being provided with a cavity; a bending control core shaft, the bending control core shaft being provided in the cavity and being capable of sliding in the cavity; and a self-locking mechanism, the self-locking mechanism being used to lock the position of the bending control core shaft in the cavity so that the position of the bending control core shaft in the cavity remains unchanged when no external force is applied to the outer shell and / or the bending control core shaft; wherein the self-locking mechanism comprises: a first friction member, the first friction member applying pressure along a first direction to the bending control core shaft to generate friction along the sliding direction of the bending control core shaft in the cavity; and a second friction member, the second friction member applying pressure along a second direction opposite to the first direction to the bending control core shaft to generate friction along the sliding direction of the bending control core shaft in the cavity.

Description

Technical Field

[0001] The present application relates to the field of medical devices, and in particular to a control handle for a radiofrequency ablation catheter and a radiofrequency ablation catheter. Background Art

[0002] Heart failure is a common disease among the elderly, affecting approximately three million people in the United States and 15 million worldwide. The prevalence increases with age, reaching approximately 10% among those over 75. Compared to surgery and medication, radiofrequency ablation (RFA) is currently a key treatment for heart failure. Cardiac RF ablation involves inserting an electrode catheter via a vein or artery into a specific location in the heart cavity. The catheter then releases a radiofrequency current, causing coagulative necrosis of the endocardium and subendocardial myocardium, thereby blocking the abnormal conduction bundles and origin of tachyarrhythmias. This intervention offers the advantages of minimal invasiveness and rapid effectiveness.

[0003] Radiofrequency ablation catheters are essential tools for radiofrequency ablation procedures. Medical personnel use a control handle to perform the procedure. However, conventional radiofrequency ablation catheters typically lack self-locking capabilities and require additional control during use, creating significant inconvenience for the user. Summary of the Invention

[0004] The present invention aims to address at least one of the technical problems existing in the prior art. To this end, one objective of the present invention is to provide a control handle for a radiofrequency ablation catheter. This control handle, through a simple structural design, enables self-locking of the radiofrequency ablation catheter. This means that, in the absence of external force applied to the control handle, the position of the control handle and the control effect of the radiofrequency ablation catheter remain unchanged. This control handle not only improves the ease and safety of use of the radiofrequency ablation catheter, but also maintains the smoothness of the control handle's sliding during operation.

[0005] According to one embodiment of the present invention, a control handle for a radiofrequency ablation catheter includes: an external shell, a cavity is provided inside the external shell; a bending control core shaft, the bending control core shaft is provided in the cavity and can slide in the cavity; and a self-locking mechanism, the self-locking mechanism is used to lock the position of the bending control core shaft in the cavity, so that when no external force (especially external force along the sliding direction) is applied to the external shell and / or the bending control core shaft, the position of the bending control core shaft in the cavity remains unchanged; wherein the self-locking mechanism includes: a first friction member, the first friction member applies pressure along a first direction to the bending control core shaft to generate friction along the sliding direction of the bending control core shaft in the cavity; and a second friction member, the second friction member applies pressure along a second direction opposite to the first direction to the bending control core shaft to generate friction along the sliding direction of the bending control core shaft in the cavity.

[0006] By providing a self-locking mechanism, the control handle can achieve self-locking of the radiofrequency ablation catheter, thereby improving the convenience of using the radiofrequency ablation catheter and the safety of radiofrequency ablation, without affecting the smoothness of the sliding of the control handle during the control process.

[0007] The control handle for the radiofrequency ablation catheter according to the above embodiment of the present invention may further have any one or any combination of the following additional technical features:

[0008] According to some embodiments of the present invention, the first friction member includes a fastener, which is fixed in the external shell and abuts the bending control core shaft. By adjusting the position of the fastener relative to the external shell, the pressure applied by the first friction member to the bending control core shaft along the first direction can be adjusted.

[0009] According to some embodiments of the present invention, the fastener comprises a screw, and the outer housing is provided with a threaded hole cooperating with the screw.

[0010] According to some embodiments of the present invention, the screw includes: a screwing portion made of a first material; and a crimping portion made of a second material, the crimping portion being connected to the screwing portion and abutting the bending control core shaft to apply pressure along a first direction to the bending control core shaft; wherein the first material is different from the second material, and the hardness of the first material is greater than the hardness of the second material.

[0011] According to some embodiments of the present invention, the first material includes stainless steel, and / or the second material includes an elastic material.

[0012] According to some embodiments of the present invention, the second material is polytetrafluoroethylene.

[0013] According to some embodiments of the present invention, the second friction member includes at least one damping tube, which is compressed on the outer circumferential surface of the bending control core shaft and the inner circumferential surface of the outer shell, thereby applying pressure along the second direction to the bending control core shaft.

[0014] According to some embodiments of the present invention, the second friction member includes at least two damping tubes sleeved together.

[0015] According to some embodiments of the present invention, the bending control core shaft includes a first groove and a second groove, which are relatively arranged on the outer peripheral surface of the bending control core shaft, wherein the first friction member applies pressure along a first direction to the bending control core shaft by abutting the bottom surface of the first groove, and the second friction member applies pressure along a second direction to the bending control core shaft by abutting the bottom surface of the second groove.

[0016] According to some embodiments of the present invention, the first groove includes two opposite side surfaces parallel to the sliding direction, and the two side surfaces abut against the first friction member, so that the first friction member can only move in the sliding direction relative to the first groove.

[0017] According to some embodiments of the present invention, the first groove and the second groove have the same shape and size.

[0018] According to some embodiments of the present invention, a cavity is provided inside the bending control mandrel, and the bending control mandrel also includes at least one air hole, and an air gap is provided between the outer peripheral surface of the bending control mandrel and the inner peripheral surface of the external shell, and the air hole and the air gap form an air flow path between the external environment of the external shell and the cavity.

[0019] According to some embodiments of the present invention, the cavity is through-going and communicates with the cavity of the outer shell, so that the air holes and the air gap form an air flow path between the external environment of the outer shell, the cavity and the cavity.

[0020] According to some embodiments of the present invention, the fastener is sealingly fixed in the outer housing by photosensitive adhesive.

[0021] Another object of the present invention is to provide a radiofrequency ablation catheter.

[0022] According to one embodiment of the present invention, a radiofrequency ablation catheter includes: a catheter, one end of which includes a flexible end; a pull wire, a first end of which is connected to the flexible end; and a control handle according to one or more embodiments of the present invention, wherein the second end of the pull wire is connected to the outer shell, so that the degree of bending of the flexible end can be adjusted by adjusting the position of the bending control core shaft in the outer shell.

[0023] The radiofrequency ablation catheter according to the above embodiment of the present invention has a control handle capable of self-locking according to the embodiment of the present invention, which greatly improves the convenience and safety of use of the radiofrequency ablation catheter.

[0024] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the following description of the embodiments with reference to the accompanying drawings.

[0026] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar components or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0027] Figure 1 A schematic diagram of a radiofrequency ablation catheter in an initial state according to one embodiment of the present invention is shown;

[0028] Figure 2 A schematic diagram of a radiofrequency ablation catheter in a bending control limit state according to an embodiment of the present invention is shown;

[0029] Figure 3 A schematic diagram showing a control handle for a radiofrequency ablation catheter in an initial state according to one embodiment of the present invention is shown;

[0030] Figure 4 A schematic diagram showing a control handle for a radiofrequency ablation catheter in a bending control limit state according to one embodiment of the present invention is shown;

[0031] Figure 5 shows a schematic diagram of a screw according to one embodiment of the present invention;

[0032] Figure 6 shows a schematic diagram of a damping tube according to one embodiment of the present invention;

[0033] Figure 7 shows a perspective view of a bending control mandrel according to one embodiment of the present invention;

[0034] Figure 8 shows a side view of a bending control mandrel according to one embodiment of the present invention;

[0035] Figure 9 A top view of a bending control mandrel according to one embodiment of the present invention is shown.

[0036] Description of reference numerals:

[0037] Radiofrequency ablation catheter 1;

[0038] Control handle 10;

[0039] External housing 11; cavity 111;

[0040] Bending mandrel 12; first groove 121; bottom surface 121-1 of the first groove; side surface 121-2 of the first groove; second groove 122; bottom surface 122-1 of the second groove; cavity 123; air hole 124;

[0041] Self-locking mechanism 13; first friction member 131; second friction member 132; screw 133; screwing portion 133-1; crimping portion 133-2; damping tube 134; large damping tube 134-1, small damping tube 134-2;

[0042] catheter 20; flexible end 21;

[0043] Annular ring 30. DETAILED DESCRIPTION

[0044] Hereinafter, only certain exemplary embodiments are briefly described. As will be appreciated by those skilled in the art, the described embodiments may be modified in various ways without departing from the spirit or scope of the present application. Therefore, the drawings and description are to be regarded as illustrative in nature and not restrictive.

[0045] Refer to the following Figures 1 to 9 A control handle 10 for a radiofrequency ablation catheter and a radiofrequency ablation catheter 1 having the control handle 10 according to one embodiment of the present invention are described.

[0046] Figure 1 A schematic structural diagram of the initial state of the radiofrequency ablation catheter 1 provided in some embodiments of the present application is shown. Figure 2 The schematic diagram of the structure of the radiofrequency ablation catheter 1 in the bending limit state provided by some embodiments of the present application is shown. Figure 1 and Figure 2 The radiofrequency ablation catheter 1 includes a control handle 10, a catheter 20, an annular ring 30, and a pull wire (not shown). The control handle 10 includes an outer shell 11 and a bending control mandrel 12. One end of the catheter 20 includes a flexible end 21; the first end of the pull wire is connected to the flexible end 21, and the second end of the pull wire is connected to the outer shell 11 of the bending control mandrel 10, so that the degree of bending of the flexible end 21 can be adjusted by adjusting the position of the bending control mandrel 12 in the outer shell 11.

[0047] In one embodiment, as the bending control core shaft 12 moves relative to the outer housing 11 toward the catheter 20, the flexible end 21 deflects, thereby facilitating positioning of the annular ring 30 at a desired ablation location. Figure 2 When the bending control core shaft 12 has the maximum sliding displacement relative to the outer shell 11, the catheter 20 achieves the maximum angular deflection, which is 180°.

[0048] Figure 3 FIG. 1 is a schematic diagram showing a control handle 10 for a radiofrequency ablation catheter in an initial state according to an embodiment of the present invention. Figure 4 FIG2 shows a schematic diagram of a control handle 10 for a radiofrequency ablation catheter in an extreme bending control state according to an embodiment of the present invention. Figure 3 、 Figure 4 The control handle 10 includes an outer shell 11, a bending control core shaft 12 and a self-locking mechanism 13. A cavity 111 is provided inside the outer shell 11. The bending control core shaft 12 is disposed in the cavity 111 and is capable of sliding in the cavity 111. Under the action of an external force (especially an external force along the sliding direction), the bending control core shaft 12 reciprocates relative to the outer shell 11 in the cavity 111 along the central axis direction of the bending control core shaft 12 to drive the flexible end 21 to deflect or restore deflection.

[0049] The self-locking mechanism 13 is used to lock the position of the bending mandrel 12 in the cavity 111, so that the position of the bending mandrel 12 in the cavity 111 remains unchanged when no external force (especially an external force along the sliding direction) is applied to the outer housing 11 and / or the bending mandrel 12. The self-locking mechanism 13 includes: a first friction member 131 and a second friction member 132. The first friction member 131 applies pressure along a first direction to the bending mandrel 12 to generate friction along the sliding direction of the bending mandrel 12 in the cavity 111; the second friction member 132 applies pressure along a second direction opposite to the first direction to the bending mandrel 12 to generate friction along the sliding direction of the bending mandrel 12 in the cavity 111.

[0050] The pressure in the first direction is the pressure applied by the first friction member 131 to the bending mandrel 12. Therefore, the first direction refers to the direction from the first friction member 131 toward the bending mandrel 12, and this direction is perpendicular to the surface of the first friction member 131 and the bending mandrel 12. It can be understood that the friction force exerted by the first friction member 131 on the bending mandrel 12 is perpendicular to the first direction and opposite to the direction in which the bending mandrel 12 slides relative to the first friction member 131. Specifically, when the bending mandrel 12 slides relative to the first friction member 131 toward the catheter 20, the friction force exerted by the first friction member 131 on the bending mandrel 12 is opposite to the direction toward the catheter 20. When the bending mandrel 12 slides relative to the first friction member 131 away from the catheter 20, the friction force exerted by the first friction member 131 on the bending mandrel 12 is directed toward the catheter 20.

[0051] The pressure in the second direction is the pressure applied by the second friction member 132 to the bending mandrel 12. Therefore, the second direction refers to the direction from the second friction member 132 toward the bending mandrel 12, and this direction is perpendicular to the surface of interaction between the second friction member 132 and the bending mandrel 12. The second direction is opposite to the first direction. Therefore, the pressure applied by the second friction member 132 to the bending mandrel 12 and the pressure applied by the first friction member 131 to the bending mandrel 12 offset each other, thereby reducing or eliminating forces or deflection moments that are not parallel to the sliding direction when the bending mandrel 12 slides in the cavity 111, thereby facilitating sliding control of the bending mandrel 12 by an operator (e.g., a surgeon). The pressure in the second direction can be equal to the pressure in the first direction to achieve optimal pressure offsetting.

[0052] Similarly, the friction force exerted by the second friction member 132 on the bending control core shaft 12 is perpendicular to the second direction and opposite to the sliding direction of the bending control core shaft 12 relative to the second friction member 132 .

[0053] The friction force generated by the first friction member 131 along the sliding direction of the bending control core shaft 12 in the cavity 111 and the friction force generated by the second friction member 132 along the sliding direction of the bending control core shaft 12 in the cavity 111 ensure that the position of the bending control core shaft 12 in the cavity 111 remains unchanged when no external force (especially external force along the sliding direction) is applied to the control handle 12.

[0054] In one embodiment, the first friction member 131 includes a fastener secured within the outer housing 11 and abutting the bending control mandrel 12. Adjusting the position of the fastener relative to the outer housing 11 adjusts the pressure applied by the first friction member 131 to the bending control mandrel 12 in the first direction. The fastener may be a bolt, stud, rivet, or other fastening component. The simple structure of the fastener facilitates adjustment of the pressure in the first direction.

[0055] In one embodiment, reference Figure 5 The fastener includes a screw 133 , and the outer housing is provided with a threaded hole (not shown in the figure) that cooperates with the screw. The screw 133 cooperates with the threaded hole to achieve the fixation of the first friction member 131 on the outer housing 11 .

[0056] In one embodiment, Figure 5 As shown, the screw 133 includes a screwing portion 133-1 made of a first material and a crimping portion 133-2 made of a second material. The crimping portion 133-2 is connected to the screwing portion 133-1 and abuts against the bending mandrel 12 to apply pressure along a first direction to the bending mandrel 12. In one embodiment, the first material is different from the second material, and the hardness of the first material is greater than the hardness of the second material.

[0057] External force acts directly on the screwing portion 133-1 to adjust the position of the fastener relative to the outer shell 11, thereby adjusting the pressure along the first direction applied by the first friction member 131 to the bending control core shaft 12. The first material making up the screwing portion 133-1 has a relatively high hardness to facilitate the external force acting on the screwing portion 133-1. The crimping portion 133-2 directly abuts the bending control core shaft 12, and directly applies the pressure in the first direction to the abutting bending control core shaft 12. The second material making up the crimping portion 133-2 has a relatively low hardness to reduce the damage caused by the crimping portion 133-2 to the surface of the bending control core shaft 12.

[0058] In one embodiment, the first material comprises stainless steel. In one embodiment, the second material comprises an elastic material. Stainless steel has high hardness and strong corrosion resistance. Using it as the first material ensures that the screwing portion 133-1 is unlikely to deform under external forces. The elastic material may be a polymer material, preferably a polymer material with a low coefficient of friction.

[0059] In one embodiment, the second material is polytetrafluoroethylene (PTFE). PTFE is a high molecular weight polymer made from tetrafluoroethylene (PTFE) as a monomer and has a low friction coefficient. Using PTFE as the second material ensures that the bending control mandrel 12 slides smoothly relative to the outer housing 11 under external forces, making it easier for the operator to control the bending mandrel 12.

[0060] In one embodiment, Figure 6 As shown, the second friction member 132 includes at least one damping tube 134. The at least one damping tube is compressed between the outer circumferential surface of the bending mandrel 12 and the inner circumferential surface of the outer housing 11, thereby applying pressure in the second direction to the bending mandrel 12. The damping tube 134 is made of a high-friction, elastic material, preferably a polymer, and more preferably a rubber material. The damping tube 134 is compressed by the bending mandrel 12 and the outer housing 11, thereby applying pressure in the second direction to the bending mandrel 12. The deformation of the damping tube 134 under external force automatically adjusts the pressure in the second direction applied by the second friction member 132 to equal the pressure in the first direction applied by the first friction member 131. This achieves the technical effect of completely offsetting the pressure in the second direction and the pressure in the first direction, thereby reducing the friction acting on the bending mandrel 12 when it slides relative to the outer housing 11.

[0061] At the same time, the damping tube 134 reverses the pressure along the second direction acting on the bending control core shaft 12 to the outer shell 11. In the absence of external force acting on the bending control core shaft 12, the friction between the damping tube 134 and the outer shell 11 prevents the damping tube 134 from sliding along with the bending control core shaft 12, further enhancing the self-locking effect.

[0062] In one embodiment, Figure 6 As shown, the second friction member 132 includes at least two damping tubes 134 sleeved together. Figure 6 As shown, the two damping tubes have different diameters, including a large damping tube 134 - 1 and a small damping tube 134 - 2 , and the small damping tube 134 - 2 is sleeved inside the large damping tube 134 - 1 .

[0063] In one embodiment, Figure 7-Figure 9 As shown, the bending control core shaft 12 includes a first groove 121 and a second groove 122, which are relatively arranged on the outer peripheral surface of the bending control core shaft 12, wherein the first friction member 131 applies pressure along the first direction to the bending control core shaft 12 by abutting against the bottom surface 121-1 of the first groove 121, and the second friction member 132 applies pressure along the second direction to the bending control core shaft 12 by abutting against the bottom surface 122-1 of the second groove 122.

[0064] Since the first friction member 131 is accommodated in the first groove 121 , the first friction member 131 also serves to limit the bending control mandrel 12 , thereby preventing the bending control mandrel 12 from sliding out of the outer housing 11 .

[0065] The arrangement of the first groove 121 and the second groove 122 can further ensure that the pressure in the first direction exerted by the first friction member 131 on the bending control core shaft 12 is opposite to the pressure in the second direction exerted by the second friction member 132 on the bending control core shaft 12 .

[0066] In one embodiment, the first groove 121 and the second groove 122 are both arranged along the central axis of the bending control mandrel 12. In one embodiment, the length of the second friction member 132 along the central axis of the bending control mandrel 12 is equal to the length of the second groove 122 along the central axis of the bending control mandrel 12, so that when no external force is applied to the bending control mandrel, the second friction member 132 can block the bending control mandrel 12 in the sliding direction, further enhancing the self-locking effect.

[0067] In one embodiment, the first groove 121 includes two opposite side surfaces 121-2 parallel to the sliding direction, and the two side surfaces 121-2 abut against the first friction member 131, so that the first friction member 131 plays a locking role to prevent the bending core shaft 12 from lateral rotation during the sliding process.

[0068] In one embodiment, the first groove 121 and the second groove 122 have the same shape and size.

[0069] In one embodiment, reference Figure 7 、 Figure 8 The outer circumferential surface of the bending control core shaft 12 is circular, and the radial depth of the first groove 121, that is, the minimum distance between the bottom surface 121 - 1 of the first groove 121 and the circumferential surface of the bending control core shaft 12, is 1 / 5-1 / 4 of the circumferential radius of the bending control core shaft 12.

[0070] In one embodiment, reference Figure 7 As shown, a cavity 123 is provided inside the bending control mandrel 12, and the bending control mandrel 12 also includes at least one air hole 124. An air gap (not shown in the figure) is provided between the outer peripheral surface of the bending control mandrel 12 and the inner peripheral surface of the outer shell 11. The air hole 124 and the air gap form an air flow path between the external environment of the outer shell 11 and the cavity 123. Medical devices need to be sterilized at high temperature or high pressure before use. The provision of the air hole 124 and the air gap facilitates the sterilization of the inner and outer surfaces of the bending control mandrel 12 by high temperature or high pressure gas.

[0071] In one embodiment, the cavity 123 is through-hole and communicates with the cavity 111 of the outer shell 11, so that the air holes 124 and the air gap form an air flow path between the external environment of the outer shell 11, the cavity 123, and the cavity 111. The air flow path facilitates the circulation of high-temperature, high-pressure gas to ensure disinfection and sterilization.

[0072] In one embodiment, the fastener is sealingly fixed in the outer housing 11 by photosensitive adhesive.

[0073] The control handle 10 for the radiofrequency ablation catheter of the above embodiment of the present invention can achieve self-locking of the radiofrequency ablation catheter, that is, when no external force is applied to the control handle, the control handle can maintain the control effect of the radiofrequency ablation catheter, which not only improves the convenience of using the radiofrequency ablation catheter, but also improves the safety of radiofrequency ablation. Based on the above control handle 10 for the radiofrequency ablation catheter, the present invention also provides a radiofrequency ablation catheter 1. Figure 1 and Figure 2 A radiofrequency ablation catheter 1 according to an embodiment of the present invention is described.

[0074] like Figure 1 and Figure 2 As shown, the radiofrequency ablation catheter 1 includes: a control handle 10 as described in one or more embodiments of the present invention, a catheter 20, and a pull wire (not shown). One end of the catheter 20 includes a flexible end 21; a first end of the pull wire is connected to the flexible end 21, and a second end of the pull wire is connected to the outer housing 11, so that the degree of bending of the flexible end 21 can be adjusted by adjusting the position of the bending control mandrel 12 in the outer housing 11.

[0075] It should be understood that in this specification, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships or dimensions based on the orientations or positional relationships or dimensions shown in the accompanying drawings, and these terms are used only for the convenience of description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of this application.

[0076] Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Thus, a feature specified as "first," "second," or "third" may explicitly or implicitly include one or more of the features. In the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0077] In this application, unless otherwise expressly specified or limited, terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0078] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0079] This specification provides many different embodiments or examples that can be used to implement the present application. It should be understood that these different embodiments or examples are purely exemplary and are not intended to limit the scope of protection of the present application in any way. Those skilled in the art can conceive of various changes or replacements based on the disclosure of the specification of the present application, all of which should be encompassed within the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection defined by the appended claims.

Claims

1. A control handle for a radiofrequency ablation catheter, characterized in that: The control handle comprises: An outer shell, wherein a cavity is provided inside the outer shell; a bending control mandrel, the bending control mandrel being disposed in the cavity and being capable of sliding in the cavity, the bending control mandrel comprising a first groove and a second groove, the first groove and the second groove being oppositely disposed on an outer peripheral surface of the bending control mandrel; and a self-locking mechanism for locking the position of the bending control mandrel within the cavity, so that the position of the bending control mandrel within the cavity remains unchanged when no external force is applied to the outer housing and / or the bending control mandrel; Wherein, the self-locking mechanism includes: a first friction member, comprising a fastener, the fastener being fixed in the outer housing and abutting against a bottom surface of the first groove, wherein by adjusting a position of the fastener relative to the outer housing, the first friction member can be adjusted to apply pressure along a first direction to the bending control mandrel to generate a friction force along a sliding direction of the bending control mandrel in the cavity; and The second friction member includes at least two damping tubes sleeved together, and the at least two damping tubes are compressed on the outer peripheral surface of the bending control core shaft and the inner peripheral surface of the outer shell. The second friction member applies pressure to the bending control core shaft in a second direction opposite to the first direction by abutting the bottom surface of the second groove, so as to generate friction force along the sliding direction of the bending control core shaft in the cavity.

2. The control handle according to claim 1, characterized in that: The fastener comprises a screw, and the outer shell is provided with a threaded hole matched with the screw.

3. The control handle according to claim 2, characterized in that: The screw comprises: A screw portion made of a first material; and a crimping portion made of a second material, the crimping portion being connected to the screwing portion and abutting against the bending control mandrel to apply pressure along a first direction to the bending control mandrel; The first material is different from the second material, and the hardness of the first material is greater than the hardness of the second material.

4. The control handle according to claim 3, characterized in that: The first material includes stainless steel, and / or the second material includes an elastic material.

5. The control handle according to claim 4, characterized in that: The second material is polytetrafluoroethylene.

6. The control handle according to any one of claims 1 to 5, characterized in that: The first groove includes two opposite side surfaces parallel to the sliding direction, and the two side surfaces abut against the first friction member, so that the first friction member can move relative to the first groove only in the sliding direction.

7. The control handle according to any one of claims 1 to 5, characterized in that: The first groove and the second groove have the same shape and size.

8. The control handle according to any one of claims 1 to 5, characterized in that: A cavity is provided inside the bending control core shaft, and the bending control core shaft also includes at least one air hole. An air gap is provided between the outer peripheral surface of the bending control core shaft and the inner peripheral surface of the external shell. The air hole and the air gap form an air flow path between the external environment of the external shell and the cavity.

9. The control handle according to claim 8, characterized in that: The cavity is through-going and communicates with the cavity of the outer shell, so that the air holes and the air gap form an air flow path between the external environment of the outer shell, the cavity and the cavity.

10. The control handle according to any one of claims 1 to 5, characterized in that The fastener is sealed and fixed in the outer shell by photosensitive adhesive.

11. A radiofrequency ablation catheter, characterized in that: The radiofrequency ablation catheter comprises: a catheter, one end of the catheter comprising a flexible end; a pull wire having a first end connected to the flexible end; and The control handle according to any one of claims 1 to 10, in, The second end of the pull wire is connected to the outer shell, so that the bending degree of the flexible end can be adjusted by adjusting the position of the bending control core shaft in the outer shell.

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