RADIOFREQUENCY ABLATION CATHETER WITH MOVING GUIDE CABLE FUNCTION
Patent Information
- Application Number
- MX2022008808
- Authority / Receiving Office
- MX · MX
- Patent Type
- Patents
- Current Assignee / Owner
- Priority Date
- 2020-01-16
- Filing Date
- 2022-07-15
- Publication Date
- 2026-02-25
- Estimated Expiration
- 2041-01-15
AI Technical Summary
Conventional radiofrequency ablation catheters require frequent insertion and removal of a separate guide wire, which is time-consuming and increases the risk during operations, especially when multiple ablation areas need to be treated, and the guide wire lacks additional functions.
A radiofrequency ablation catheter with a movable guide wire integrated into the catheter design, allowing the guide wire to move forward and backward to expand and contract the electrode stent, eliminating the need for separate guide wire insertion and simplifying the operation process.
The integrated movable guide wire simplifies the operation by allowing direct access to multiple ablation areas without repeated insertion, reducing operation time and risk, and provides additional functions like wall apposition adjustment and support.
Smart Images
Figure MX431610B0
Abstract
Description
RADIOFREQUENCY ABLATION CATHETER WITH MOVING GUIDE CABLE FUNCTION FIELD OF INVENTION The invention relates to a radiofrequency ablation catheter having a movable guide wire, which belongs to the technical field of medical devices. BACKGROUND OF THE INVENTION Radiofrequency ablation technology is widely used in the medical field. A radiofrequency ablation catheter carrying multiple electrodes can greatly optimize radiofrequency efficiency. Currently, prior to the operation, the radiofrequency ablation catheter must be introduced into the blood vessel with the aid of a guidewire. Specifically, the guidewire is first sent to the desired ablation area (such as branches of blood vessels); the guidewire enters the body along the guidewire and reaches the desired position; and the guidewire is then withdrawn. Next, the radiofrequency ablation catheter with an electrode stent in a contracted state is sent to the desired ablation site along the guidewire. ML / t / ZUZZ / UOOOZO Next, the guide tube is removed and the electrode stent is expanded to MA / t / ZUZZ / UOOOZO that the electrodes are attached to the blood vessel wall for ablation. After ablation, the electrode stent is retracted and then the radiofrequency ablation catheter is removed. When it is necessary to change the position of the radiofrequency ablation catheter during the operation, it must be moved after reinserting the guide wire. This is especially important when ablating multiple target areas in a single procedure, such as ablating multiple sides or different branches of blood vessels. In such cases, the radiofrequency ablation catheter must be withdrawn, and the guide wire then reused to guide the catheter into another target area. Therefore, the guide wire must be inserted and withdrawn multiple times during a single operation, which is time-consuming, inconvenient, and increases the risk of complications. Additionally, the conventional guidewire is usually an accessory to the radiofrequency ablation catheter or a separate medical device. Therefore, the storage and management of the guidewire and the radiofrequency ablation catheter are handled separately, which is inconvenient. Furthermore, the conventional guidewire has no auxiliary functions other than guidance. BRIEF DESCRIPTION OF THE INVENTION The technical problem to be solved by the invention is to provide a radiofrequency ablation catheter that has the function of a movable guide wire. To achieve the aforementioned technical objective, the invention adopts the following technical scheme: A radiofrequency ablation catheter with a movable guidewire consists of an electrode stent, a catheter body, and a control handle. The catheter body connects to the electrode stent and the control handle at opposite ends. The catheter body has a lumen for the movable guidewire, which travels through it. The guidewire passes through the catheter body and exits the electrode stent, with its distal end always fixed outside the electrode stent. The proximal movable guidewire passes through the catheter body and enters the control handle, where it is attached to a control element either on or outside the control handle. The guidewire can be moved forward or backward by the control element, thereby switching the electrode stent between a retracted and an extended state. Preferably, the movable guidewire consists of a catheter body and a soft guidewire disposed at a distal end of the body ML / t / ZUZZ / UOOOZO of mobile guide wire, and is always kept outside the electrode stent. Preferably, the distal end of the movable guide wire is not fixed to the electrode stent and is movable relative to a distal end of the electrode stent. Preferably, the guide wire body has a first stop point at a distal end of the electrode stent, which is limited outside the distal end of the electrode stent, and the first stop point is used to extend the electrode stent. Preferably, the guide wire body parallel to the electrode stent is provided with a second stop point, which is limited between the distal end and the proximal end of the electrode stent, and the second stop point is used to contract the electrode stent. Preferably, the guidewire body has a first stop point at the distal end of the electrode stent, which is limited to the distal end of the electrode stent, and this first stop point is used to extend the electrode stent. Additionally, the guidewire body, parallel to the electrode stent, is provided with a second stop point, which is limited to the distal and proximal ends of the electrode stent, and this second stop point is used to retract the electrode stent. Preferably, the guide wire body is attached to the distal end of the ML / t / ZUZZ / UOOOZO ML / t / ZUZZ / UOOOZO electrode stent near the soft guide wire; or, the guide wire body is provided with a first stop point at the distal end of the electrode stent, and the first stop point is fixed to the distal end of the electrode stent. Preferably, the shape of the distal end of the soft guide wire has a straight line, curve, arc, or other shape. Preferably, the distal end of the soft guide wire extends at an angle of 0~90 degrees. Preferably, the body of the guide wire of the moving guide wire functions as a support wire. Preferably, the electrode stent is in the form of a mesh, spiral, or basket shape, and is attached to a plurality of electrodes. The radiofrequency ablation catheter with a movable guidewire function provided by the invention, by combining the movable guidewire and the radiofrequency ablation catheter, eliminates the need to manually insert and withdraw the guidewire from the radiofrequency ablation catheter, simplifies the operation of the guidewire, and facilitates the insertion of the radiofrequency ablation catheter into the target lumen prior to the procedure. Simultaneously, it allows for convenient repositioning of the radiofrequency ablation catheter during the procedure. During the procedure, the desired ablation area can be reached using the flexible guidewire. MA / t / ZUZZ / UOOOZO is placed at the distal end of the mobile guide wire without additional guide wire. During displacement after one-sided ablation, it is not necessary to withdraw the catheter; simply retract the electrode stent within the guide tube, exposing the soft guide wire outside the guide tube. This facilitates access to the blood vessel branch. Upon entering the vascular branch, the target vascular branch can be accessed by moving or rotating the radiofrequency ablation catheter or by moving or rotating the mobile guide wire. Through these improvements, the operating time is shortened, and there is no need to frequently withdraw and reinsert the guide wire and radiofrequency ablation catheter during the operation, thus reducing both time and cost.More importantly, the radiofrequency ablation catheter can be inserted into the body once and removed after ablation in multiple locations (left and right sides, or different branches of blood vessels). It does not need to be removed mid-operation, thus avoiding both increased risk and a longer operating time. BRIEF DESCRIPTION OF THE FIGURES Fig. 1 is an illustrated structural diagram of a movable guide wire provided in a first embodiment of the radiofrequency ablation catheter described herein; ML / t / ZUZZ / UOOOZO Fig. 2 is an illustrated structural diagram of a first embodiment of the radiofrequency ablation catheter, in which an electrode stent is in a contracted state, and a control element for controlling the movable guide wire is configured in the control handle; Fig. 3 is an illustrated structural diagram of one embodiment of the control handle, in which the control element is arranged outside the control handle; Fig. 4 is an illustrated structural diagram of the first embodiment of the radiofrequency ablation catheter, in which the electrode stent is in an expanded state with a movable distal end of the guide wire that is not fixed; Fig. 5 is an illustrated structural diagram of the first realization of the radiofrequency ablation catheter, in which the electrode stent is in an expanded state with the distal end of the mobile guide wire and the distal end of the electrode stent fixed; Fig. 6 is an illustrated structural diagram of a second embodiment of the radiofrequency ablation catheter described herein, in which the movable guide wire is provided with a first stopping point; Figure 7 is an illustrated structural diagram of the second embodiment of the radiofrequency ablation catheter described in this document, in ML / t / ZUZZ / UOOOZO which the electrode stent is in a contracted state; Fig. 8 is an illustrated structural diagram of the second embodiment of the radiofrequency ablation catheter described in this document, showing that the first stop point is used to expand the electrode stent; Fig. 9 shows the mobile guide wire 30 in this embodiment having a guide wire body 31 and a soft guide wire 32 arranged at the distal end of the guide wire body 31; Fig. 10 is an illustrated structural diagram of the third embodiment of the radiofrequency ablation catheter described herein, in which the electrode stent is in the contracted state, and the second stop point is used to contract the electrode stent; Fig. 11 is an illustrated structural diagram of the third embodiment of the radiofrequency ablation catheter described herein, in which the electrode stent is in an expanded state and the first stop point is used to expand the electrode stent. DETAILED DESCRIPTION OF THE INVENTION The technical scheme of the invention will be described in more detail below in combination with the accompanying drawings and specific embodiments. First realization As shown in Fig. 1 and Fig. 2, the radiofrequency ablation catheter with a movable guidewire provided by the first embodiment of the present invention successively includes an electrode stent 1, a thin catheter body 2, and a control handle 3, wherein both ends of the catheter body 2 are respectively connected to the electrode stent 1 and the control handle 3. The tip of the radiofrequency ablation catheter closest to a patient is defined as a distal end, and the tip of the radiofrequency ablation catheter closest to an operator is defined as a proximal end. The electrode stent 1 is disposed at the distal end of the catheter body 2, and the control handle 3 is connected to the proximal end of the catheter body 2. The mesh stent may or may not be preformed before assembly, and its shape may deform during assembly and expansion. After assembly, the overall shape of the mesh stent may be cylindrical or drum-shaped. After assembly, each end of electrode stent 1 is joined and connected to form a connecting tube, thus creating a distal end 15 and a proximal end of the mesh stent. The mid-segment of the mesh stent has a contracted and an expanded state. One or more electrodes 9 are attached to the braided wire of the mid-segment of the mesh stent. The mid-segment of electrode 1 can ML / t / ZUZZ / UOOOZO ML / t / ZUZZ / UOOOZO expands by itself in the desired ablation lumen, or expands under the action of the apposition adjustment wire on the wall or the movable guide wire 10, so that electrode 9 adheres to the wall. Electrode 9 can be a block electrode or a ring electrode, and electrode 9 protrudes from the braided wire, making electrode 9 come into full contact with the wall of the desired lumen and improving the apposition effect on the wall. The braided wire used to braid the mesh stent can be made of metallic or polymeric material, such as stainless steel or shape-memory alloy. When shape-memory alloy is used as the mesh stent material, after the electrode 1 stent reaches the desired lumen within a guide tube, once the guide tube is removed, the electrode 1 stent can self-expand through the automatic deformation of the shape-memory alloy. To improve the apposition effect on the electrode 9 wall, the apposition effect of the electrode 1 stent can also be adjusted by pulling the apposition adjustment wire on the wall, making it suitable for lumens of different diameters.For electrode stent 1, which does not use a shape memory alloy, when the guide tube is removed, the expanded diameter of the mesh stent can be directly adjusted using the apposition wire to allow electrode placement on the cavity wall. ML / t / ZUZZ / UOOOZO Of course, in other embodiments, the contraction and expansion of the mesh tube can also be achieved by pulling the movable guide wire, thus eliminating the adjustment wire from the apposition on the wall. The thin catheter body 2 is used to accommodate and support various wires and movable guide wires 10 of the radiofrequency ablation catheter, and the catheter body 2 can also be used to deliver gas or liquid to the desired lumen at the distal end. The catheter body 2 can be a tube with several lumens, some of which are used to accommodate radiofrequency wires, thermocouple wires, and other wires to achieve the measurement function, and other lumens are used to accommodate a support wire, the wall apposition adjustment wire, or the movable guide wire 10. The mobile guidewire 10 and the wall apposition adjustment wire can be accommodated in different lumens or share a single lumen. The lumen to accommodate the mobile guidewire 10 extends either centrically along the catheter body 2 or eccentrically. For example, the mobile guidewire 10 is housed in a central lumen of the catheter body 2 or in a peripheral lumen of the catheter body 2. A bundle of RF wires and thermocouple wires is secured within each electrode 9. The RF wire and thermocouple wire are secured within electrode 9. The thermocouple wire is wrapped with insulating material to prevent interference from high-frequency electricity. The RF wire and thermocouple wire extend from the distal end of the catheter body 2 to the control handle 3. They are then connected to a radiofrequency ablation device via an interface on the control handle 3. The support wire is fixed inside the catheter body 2 to support the catheter body 2. When the strength of the guide wire body 11 of the mobile guide wire 10 is sufficient, the guide wire body 11 can also support the catheter body 2, therefore, the guide wire body 11 of the mobile guide wire 10 can be used as a support wire at the same time, and no additional support wire is required. In the radiofrequency ablation catheter with a movable guide wire provided by the first embodiment, the movable guide wire 10 is integrated with the radiofrequency ablation catheter, and it is not necessary to remove the movable guide wire 10 during the operation, which is always kept inside the radiofrequency ablation catheter. Specifically, the catheter body 2 is provided with a lumen in which the movable guidewire is moved. The movable guidewire 10 is composed of a guidewire body 11 and a soft guidewire 12 arranged at a distal end of the guidewire body 11. As shown in Fig. 2, the distal end of the movable guidewire 10 passes through the MA / t / ZUZZ / UOOOZO MA / t / ZUZZ / UOOOZO catheter body. 2 and extends from the distal end of electrode stent 1 and is always limited outside the distal end of the electrode stent; The proximal end of the movable guide wire 10 passes through the proximal end of the catheter body 2 and enters the control handle 3. Then, the proximal end of the movable guide wire 10 is attached to the control element 4 disposed on the control handle 3. The movable guide wire 10 extends in the forward and backward direction under the action of the control element 4 to transform electrode stent 1 between the contracted state and the expanded state. The control handle 3 may also have a structure as shown in Figure 3. The proximal end of the movable guide wire 10 only passes through the control handle 3 and is attached to the control element 8 disposed outside the control handle 3. The control handle 3 shown in Fig. 2 and Fig.3 also features another interface for attaching RF wires, thermocouple wires and other wires and connecting to the control handle with an external RF ablation device. As shown in Fig. 2, in this embodiment, by adjusting the length of the movable guide wire 10, the soft guide wire 12 at the distal end of the movable guide wire 10 can be kept out of the electrode 1 stent. In other embodiments, the soft guide wire 12 can be kept out of the electrode 1 stent by a first stop point on the body of the guide wire 11. The first stop point is close to the soft guide wire 12 and is limited outside the distal end of the electrode 1 stent. The soft guide wire 12 serves as a guide and is easily inserted into the branches of blood vessels. The distal end of the soft guide wire 12 extends from the distal end of the mobile guide wire 10 at an angle of 0 to 90 degrees. The shape of the distal end of the soft guide wire 12 can be any of the following: straight, curved, arced, or other shapes, including but not limited to L-shaped, straight, or U-shaped, to reach the desired lumen in different positions. In this embodiment, the distal end of the movable guide wire 10 may or may not be fixed to the distal end of the electrode 1 stent. When the distal end of the movable guide wire 10 is not fixed to the distal end of the electrode 1 stent, the distal end of the movable guide wire 10 and the distal end of the electrode 1 stent can move relative to each other. When the distal end of the movable guide wire 10 is fixed to the distal end of the electrode 1 stent, the body of the guide wire 11 can be fixed directly or indirectly to the distal end of the electrode 1 stent in a position close to the soft guide wire 12 by welding, adhesive, hot melt, etc. At this time, the movable guide wire 10 has the function of expanding and contracting the electrode 1 stent. As shown in Fig. 4, when the distal end of the mobile guide wire 10 is not fixed to the distal end of the electrode stent 1, the ML / t / ZUZZ / UOOOZO MA / t / ZUZZ / UOOOZO The distal end of the electrode 1 stent moves freely relative to the movable guidewire 10 during contraction and expansion of the electrode 1 stent. Retraction and extension of the electrode 1 stent can be performed in other ways. For example, expansion of the electrode 1 stent is performed by pulling back the apposition-to-wall adjustment wire, and contraction of the electrode 1 stent is performed by pushing the apposition-to-wall adjustment wire forward. In this process, the movable guidewire 10 does not slip relative to the catheter body 2. As shown in Fig. 5, when the distal end of the mobile guidewire 10 is attached to the distal end of the electrode 1 stent, the electrode 1 stent can be contracted or expanded by pushing or pulling the mobile guidewire 10 forward or backward. During this process, the mobile guidewire 10 slides into the catheter body 2. In the radiofrequency ablation catheter provided by the first embodiment of the invention, by combining the movable guide wire 10 with the radiofrequency ablation catheter, the action of inserting and removing the movable guide wire 10 from the radiofrequency ablation catheter is eliminated during the operation, which simplifies the operation of the movable guide wire 10 and facilitates the movement of the radiofrequency ablation catheter during the operation. Using the radiofrequency ablation catheter described above with a movable guidewire during the operation, the radiofrequency ablation catheter with the movable guidewire is delivered directly to the desired ablation area via the soft guidewire 12 at the distal end of the movable guidewire 10. The radiofrequency ablation catheter is then withdrawn from the guidewire or advanced so that the electrode stent 1 reaches the desired ablation area. The electrode stent 1 self-expands due to its inherent elasticity. Based on the design of the radiofrequency ablation catheter, the expansion of the electrode stent 1 and its apposition to the wall of the electrodes 9 can also be adjusted using the adjustment wire for the apposition to the wall.Alternatively, after withdrawing the radiofrequency ablation catheter from the guide tube, the expansion of the electrode 1 stent can be directly controlled by adjusting the apposition wire to the wall to ensure that the multiple electrodes 9 make contact with the lumen wall. After ablation, the radiofrequency ablation catheter is withdrawn into the guide tube, and the electrode 2 stent is contracted using the guide tube. For radiofrequency ablation catheters with the distal end of the movable guide wire 10 fixed to the distal end of the electrode 1 stent, contraction and expansion of the electrode 1 stent can be achieved by pushing or pulling the movable guide wire 10 forward or backward. ML / t / ZUZZ / UOOOZO When it is necessary to change the position of the radiofrequency ablation catheter in the blood vessel, the soft guide wire 12 is used to move the radiofrequency ablation catheter to the new desired ablation area and then the guide wire is removed to expand the electrode 1 stent of the radiofrequency ablation catheter for another ablation. During the previous operation, there is no need to insert and remove the movable guide wire, which simplifies the operation of the movable guide wire, facilitates the transfer of the radiofrequency ablation catheter during the operation, and saves operating time. If the shape of the blood vessel bifurcation is special and the soft guide wire 12 is not suitable to enter the desired branch of the blood vessel, using the radiofrequency ablation catheter with the distal end of the mobile guide wire 10 not fixed and the proximal end of the mobile guide wire 10 fixed in the control element 8 outside the control handle 3, the mobile guide wire 10 can be removed from the catheter body 2 and the control handle 3, and replaced with a new mobile guide wire that has an appropriate soft guide wire. Second realization As shown in Figs. 6 to 8, the radiofrequency ablation catheter with a movable guidewire shown in the second embodiment has a similar structure to that of the first embodiment, where The radiofrequency ablation catheter (ML / t / ZUZZ / UOOOZO) is successively composed of an electrode stent 1, a catheter body 2, and a control handle 3. The catheter body 2 is connected to the electrode stent 1 and the control handle 3 at opposite ends. The catheter body 2 has a lumen in which the movable guide wire 20 can be moved. The distal end of the movable guide wire 20 passes through the catheter body 2 and extends from the distal end of the electrode stent 1, and is secured outside the distal end of the electrode stent 1. The proximal end of the movable guide wire 20 passes from the proximal end of the catheter body 2 to the control handle 3, and then the proximal end of the movable guide wire 20 is secured to the control element located on the control handle 3 or to the control element located outside the control handle 3.The movable guide wire 20 extends or retracts under the action of the control element, so that the electrode stent switches between the contracted state and the expanded state. In this embodiment, except that the structure of the mobile guide wire 20 is different from that of the mobile guide wire 10 in the first embodiment, the structure of other components is the same as that of the radiofrequency ablation catheter provided in the first embodiment, and will not be described further here. The following describes only the structure and function of the ML / t / ZUZZ / UOOOZO MA / t / ZUZZ / UOOOZO mobile guide wire 20 applied in the second embodiment. As shown in Fig. 6, the mobile guide wire 20 used in this embodiment has a guide wire body 21 and a soft guide wire 22 arranged at a distal end of the guide wire body 21. The soft guide wire 22 serves as a guide, facilitating its entry into the target branch of the blood vessel. The distal end of the soft guide wire 22 extends at an angle of 0 to 90 degrees. The shape of the distal end of the soft guide wire 22 can be a straight line, a curve, an arc, or other shapes, including but not limited to L-shapes, straight shapes, or other forms, which are used to enter different ablation lumens. The mobile guidewire 20 is provided with a first stop point 23, which can be a tube with a diameter larger than the inside diameter of the distal end (the distal connecting tube) of the electrode 1 stent, or a protrusion or connecting block with a height greater than the inside diameter of the distal end 15 of the electrode 1 stent. As shown in Fig. 7, the first stop point 23 is set into the body of the guidewire 21 outside the distal end 15 of the electrode 1 stent, and is constrained outside the distal end 15 of the electrode 1 stent, so that the soft guidewire 22 at the distal end 15 of the mobile guidewire 20 is also constrained outside the electrode 1 stent. The first stop point 23 has the function of expanding the electrode 1 stent to ensure apposition ML / t / ZUZZ / UOOOZO between the electrodes in the lumen wall. In this embodiment, since the movable guide wire 20 has the first stop point 23, when the movable guide wire 20 is pulled back, as shown in Fig. 8, the first stop point 23 moves the distal end 15 of the electrode 1 stent towards the proximal end of the electrode 1 stent, so that the electrode 1 stent expands, thereby completing the apposition action on the electrode 9 wall. The mobile guide wire 20 can be combined with the guide tube to perform expansion and contraction of the electrode 1 stent. Using the aforementioned radiofrequency ablation catheter with a movable guidewire, under the guidance of the soft guidewire 22 at the distal end of the movable guidewire 20, the radiofrequency ablation catheter with the movable guidewire 20 is delivered directly to the desired lumen. The radiofrequency ablation catheter is then withdrawn from the guidetube or advanced so that the electrode 1 stent is exposed to the desired ablation area. The electrode 1 stent expands due to its own elasticity. At this point, the expansion of the electrode 1 stent and the contact force against the electrode 9 wall are adjusted by pulling on the movable guidewire 20. Alternatively, after withdrawing the radiofrequency ablation catheter from the guidetube, the expansion of the electrode 1 stent is directly controlled using the guidewire. ML / t / ZUZZ / UOOOZO mobile 20, so that multiple electrodes 9 adhere to the wall. After ablation, the mobile guide wire 20 is pushed forward to release the mobile guide wire 20 from the block of the distal end of the electrode 1 stent and then withdraws the radiofrequency ablation catheter into the guide tube, using the guide tube to contract the electrode 2 stent. When it is necessary to change the position of the radiofrequency ablation catheter in the blood vessel, the soft guide wire 22 is used to move the radiofrequency ablation catheter to the new desired ablation area, and then the guide tube is removed, and the electrode 1 stent of the radiofrequency ablation catheter is expanded by controlling the movable guide wire 20 for ablation. During the aforementioned operation, there is no need to repeatedly insert and remove a guide wire, which simplifies the operation of the movable guide wire 20 and facilitates the movement of the radiofrequency ablation catheter during the procedure. Furthermore, in this embodiment, since the first stop point 23 is located at the distal end of the movable guide wire 20, the movable guide wire 20 functions as a wall apposition adjustment wire, and there is no need for an additional wall apposition adjustment wire other than the movable guide wire 20 on the radiofrequency ablation catheter. MA / t / ZUZZ / UOOOZO In this embodiment, the electrode 1 stent is expanded by the first stop point 23 on the distal end of the mobile guide wire 20, which is similar to the function achieved when it is fixed to the distal end of the mobile guide wire 20 with the distal end 15 of the electrode 1 stent in the first embodiment. However, compared to the case of fixing the distal end of the mobile guide wire 20 with the distal end of the electrode 1 stent, the case of the first stop point 23 on the distal end of the mobile guide wire 20 is convenient for installation, and the distal end of the electrode 1 stent and the distal end of the mobile guide wire 20 can move with relative freedom, so that the electrode 1 stent has better adaptability to the blood vessels. Furthermore, in this embodiment, the first stop point 23 provided on the movable guide wire 20 can be fixed to the distal end 15 of the electrode 1 stent, so that the movable guide wire 20 functions as an apposition-adjustment wire against the wall. At this point, the function of the movable guide wire 20 is the same as that achieved by fixing the distal end of the movable guide wire 20 to the distal end of the electrode 1 stent in the first embodiment. The third realization: As shown in Figures 9 to 11, the third embodiment provides a radiofrequency ablation catheter that has a wire MA / t / ZUZZ / UOOOZO mobile guide wire, a structure similar to that of the first embodiment. The radiofrequency ablation catheter is composed of an electrode stent 1, a catheter body 2, and a control handle 3 arranged in sequence, with the catheter body 2 connected to the electrode stent 1 and the control handle 3 at opposite ends. The catheter body 2 contains a lumen in which the mobile guide wire 30 is moved. The distal end of the mobile guide wire 30 passes through the catheter body 2 to the distal end of the electrode stent 1 and is held outside the distal end 15 of the electrode stent 1. The proximal end of the mobile guide wire 30 crosses from the proximal end of the catheter body 2 to the control handle 3 and is then attached to the control element disposed in the control handle 3 or to the control element disposed outside the control handle 3.The movable guide wire 30 advances or retreats under the action of the control element to transform between the contracted state and the expanded state of the electrode stent. In this embodiment, except that the structure of the movable guide wire 30 is different from that of the movable guide wire 10 in the first embodiment, the structure of other components is the same as that of the radiofrequency ablation catheter provided in the first embodiment, and will not be described further herein. The following section will only present the structure of the movable guide wire. MA / t / ZUZZ / UOOOZO applied in the third realization. As shown in Fig. 9, the mobile guide wire 30 in this embodiment has a guide wire body 31 and a soft guide wire 32 arranged at the distal end of the guide wire body 31. The distal soft guide wire 32 serves as a guide to facilitate access of the mobile guide wire 30 to the desired branch of the blood vessel. The distal end of the soft guide wire 32 extends at an angle of 0–90 degrees. The shape of the distal end of the soft guide wire 32 can be a straight line, a curve, an arc, or other shapes, including but not limited to L-shape, straight shape, or other shapes, to enter different ablation lumens. The movable guidewire 30 is provided with a first stop point 33 and a second stop point 34. The first stop point 33 and the second stop point 34 can be, respectively, a connecting tube with a diameter larger than the inside diameter of the distal end 15 of electrode stent 1, or a protrusion or connecting block with a height greater than the inside diameter of the distal end 15 of electrode stent 1. The second stop point 34 and the first stop point 33 are established at predefined intervals. The first stop point 33 is provided on the body of the guidewire 31 outside the distal end of electrode stent 1 and is limited outside the distal end 15 of the stent. ML / t / ZUZZ / UOOOZO electrode 1, so that the soft guide wire 32 provided at the distal end of the mobile guide wire 30 is always kept out of the electrode 1 stent. The first stop point 33 is used to expand the electrode 1 stent. The second stop point 34 is disposed in a part where the body of the guide wire 31 is parallel to the electrode 1 stent. The second stop point 34 is limited between the distal end 15 and the proximal end 16 of the electrode 1 stent. The second stop point 34 is used to contract the electrode 1 stent. In this embodiment, the first stop point 33 and the second stop point 34 are arranged on the movable guide wire 30. The first stop point 33 has the function of expanding the electrode stent to ensure the apposition of electrodes 9 to the wall. The second stop point 34 is used to contract the electrode 1 stent. When the movable guide wire 30 is pulled back, as shown in Figure 11, the first stop point 33 pulls the distal end 15 of the electrode 1 stent in the direction of the proximal end 16 of the electrode 1 stent, so that the electrode 1 stent expands, thus completing the apposition of electrode 9 to the wall. When the movable guide wire 30 is pushed forward, as shown in Figure 11, the first stop point 33 pulls the distal end 15 of the electrode 1 stent in the direction of the proximal end 16 of the electrode 1 stent, so that the electrode 1 stent expands, thereby completing the apposition of electrode 9 to the wall. 10, the second stopping point 34 moves the distal end 15 of electrode stent 1 away from the proximal end 16 of electrode stent 1, so that electrode stent 1 contracts. In this ML / t / ZUZZ / UOOOZO realization, the expansion and contraction of electrode stent 1 can be performed by applying only the mobile guide wire. Using the radiofrequency ablation catheter with a movable guidewire described above, under the guidance of the soft guidewire 32 at the distal end of the movable guidewire, the radiofrequency ablation catheter with the movable guidewire is delivered directly to the desired ablation lumen. The radiofrequency ablation catheter is then withdrawn from the guidetube or advanced so that electrode stent 1 is in the desired ablation area. Electrode stent 1 self-expands due to its own elasticity. At this point, the expansion of electrode stent 1 and the opposition of electrode 9 are adjusted by pulling on the movable guidewire 30. Alternatively, after withdrawing the radiofrequency ablation catheter from the guidetube, the expansion of electrode stent 1 is adjusted by directly controlling the movable guidewire 30, so that multiple electrodes 9 come into contact with the wall.After ablation, the electrode stent 1 contracts, pushing the mobile guide wire 30 forward, and then the radiofrequency ablation catheter is withdrawn inside the guide tube and out of the body. When it is necessary to change the position of the radiofrequency ablation catheter in the blood vessel, the soft guide wire 32 is applied to move the radiofrequency ablation catheter to the new area ML / t / ZUZZ / UOOOZO desired ablation, then the guide tube is removed and the electrode 1 stent is expanded controlling the mobile guide wire 30 for ablation. During the previous operation, there is no need to repeat the insertion and removal of the guide wire, which simplifies the operation of the mobile guide wire 30, facilitates the movement of the radiofrequency ablation catheter during the operation, and saves operating time. Furthermore, in this embodiment, due to the first stop point 33 and the second stop point 34 at the distal end of the mobile guide wire 30, the mobile guide wire 30 functions as an apposition wire to the wall, and no additional apposition wire to the wall is required on the radiofrequency ablation catheter other than the mobile guide wire 30. In this embodiment, due to the first stop point 33 and the second stop point 34 arranged at the distal end of the mobile guide wire 30, similar functions can be achieved to those obtained by fixing the distal end of the mobile guide wire 30 and the distal end of the electrode stent 1 in the first embodiment. However, compared to fixing the distal end of the mobile guide wire 30 to the distal end of the electrode stent 1, the arrangement of the first stop point 33 and the second stop point 34 at the distal end of the mobile guide wire 30 is more convenient for installation and offers greater flexibility for adjusting the electrode stent 1, and the electrode stent 1 has better adaptability to the blood vessels. MA / t / ZUZZ / UOOOZO The fourth production The three embodiments provided by the present invention are described in detail above in conjunction with the accompanying drawings. In addition to the three types of movable guide wires described above that are installed in the radiofrequency ablation catheter, a movable guide wire with only a second stop point can also be positioned within the radiofrequency ablation catheter, depending on commercial requirements. The second stop point is located where the guide wire body is parallel to the electrode stent. This second stop point is confined between the distal and proximal ends of the electrode stent and is used to retract the electrode stent. At this point, the mobile guide wire is combined with the self-expanding electrode stent to perform electrode stent contraction and expansion. Pushing the mobile guide wire forward causes the electrode stent to contract. Pulling the mobile guide wire backward lifts the restriction from the second stop point to the distal end of the electrode stent, allowing the electrode stent to self-expand within the lumen. Alternatively, the mobile guide wire can also be combined with the wall-fitting apposition wire to perform electrode stent expansion and contraction. Taking the radiofrequency ablation catheter with mesh stent before MA / t / ZUZZ / UOOOZO, described as an example, presents the structure of the radiofrequency ablation catheter with a movable guidewire provided by the invention. The electrode stent structure can also be of other shapes, such as a spiral or basket-shaped electrode stent. A variety of conventional expandable and contractable electrode stents can be combined with the movable guidewire structure provided by the above embodiment to form a radiofrequency ablation catheter with a movable guidewire. The movable guidewire structure can be any of the above embodiments. In summary, the radiofrequency ablation catheter with a movable guidewire provided by the invention eliminates the need to insert and withdraw the movable guidewire from the radiofrequency ablation catheter by integrating the movable guidewire with the electrode stent. This simplifies the handling of the movable guidewire and facilitates the movement of the radiofrequency ablation catheter during the procedure. During the procedure, the desired ablation area can be accessed via the soft guidewire at the distal end of the movable guidewire without the need for an additional guidewire. After ablation, it is not necessary to completely withdraw the radiofrequency ablation catheter; simply retract the electrode stent into the guidewire tube with the soft guidewire exposed outside the catheter to facilitate access of the radiofrequency ablation catheter to the branches of the MA / t / ZUZZ / UOOOZO the blood vessels. To enter the desired vascular branch, this could be done by moving or rotating the radiofrequency ablation catheter, or by moving or rotating the movable guide wire. By applying the present invention, the operating time will be shortened and it will not be necessary to insert an additional guide wire during the operation, thus reducing the cost. More importantly, the radiofrequency ablation catheter can be introduced into the human body only once and can be withdrawn after ablation treatments in multiple locations (left and right sides, or different branches of the blood vessels) of the ablation area, without increasing the risk and operating time during the surgical procedure. Furthermore, due to structural improvements, the movable guide wire now functions as a positioning wire within the wall or as a support wire. The electrode stent can be contracted and / or expanded using the first and / or second stop points on the movable guide wire. Therefore, the movable guide wire functions as a positioning wire within the wall. Additionally, the movable guide wire acts as a support wire by adjusting its resistance and stiffness. The radiofrequency ablation catheter with a movable guidewire provided by the invention has been described in detail above. For those skilled in the art, any obvious change made to the invention without departing from the essence of the invention will constitute a ML / t / ZUZZ / UOOOZO infringement of the patent right of the invention and will entail the corresponding legal responsibilities.
Claims
CLAIM 1. A radiofrequency ablation catheter having a movable guidewire comprises an electrode stent, a catheter body, and a control handle arranged in sequence, wherein the movable guidewire extends from the control handle and the catheter body to the electrode stent, with a distal end thereof outside the electrode stent; the movable guidewire can be displaced along the catheter body and the electrode stent and is controlled by a push element in or outside the control handle; the electrode stent can be transformed between a contracted state and an expanded state and is provided with a plurality of electrodes for radiofrequency ablation.
2. The radiofrequency ablation catheter according to claim 1, wherein the electrode stent has a distal end and a proximal end in the form of a connecting tube, allowing the movable guide wire to extend inside and be transferable relative to a distal end of the electrode stent, to guide the radiofrequency ablation catheter.
3. The radiofrequency ablation catheter according to claim 2, wherein the movable guide wire has a first stop point, which is limited outside the distal end of the electrode stent, and the first stop point is used to expand the electrode stent.
4. The radiofrequency ablation catheter according to claim 3, wherein the first stopping point is a tube with a diameter greater than the inside diameter of the distal end of the electrode stent, or a protrusion or connecting block with a height greater than the inside diameter of the distal end of the electrode stent.
5. The radiofrequency ablation catheter according to claim 4, wherein the movable guide wire has a second stop point limited between the distal end and a proximal end of the electrode stent, and is used to contract the electrode stent.
6. The radiofrequency ablation catheter according to claim 2, wherein the second stopping point is a tube with a diameter greater than the inside diameter of the distal end of the electrode stent, or a protrusion or connecting block with a height greater than the inside diameter of the distal end of the electrode stent.
7. The radiofrequency ablation catheter according to claim 2, wherein the movable guide wire consists of a guide wire body and a soft guide wire at a distal end of the guide wire body, and the soft guide wire is held outside the distal end of the electrode stent.
8. The radiofrequency ablation catheter according to claim 3, wherein the movable guide wire consists of a guide wire body and a soft guide wire at a distal end of the guide wire body, and both of the soft guide wire and the first stop point are kept out of the distal end of the electrode stent.
9. The radiofrequency ablation catheter according to claim 7, wherein, 15 the soft guide wire has a guiding function.
10. The radiofrequency ablation catheter according to claim 2, wherein the movable guide wire has sufficient strength to support the catheter body ML / t / ZUZZ / UOOOZO.