A radiofrequency ablation microcatheter with adjustable curvature

Abstract

The present invention provides a radiofrequency ablation microcatheter with adjustable curvature. The radiofrequency ablation microcatheter includes a microcatheter body, a radiofrequency coil, a handle, and a curvature adjusting device. The radiofrequency coil is wound around the distal end of the microcatheter body; the handle is connected to the proximal end of the microcatheter body; the curvature adjusting device is arranged on the handle and connected to the microcatheter body, and is used to adjust the curvature of the microcatheter body. The radiofrequency ablation microcatheter of the present invention does not have a guidewire cavity inside. During the treatment of varicose veins, the microcatheter can reach the lesion site without relying on guidewire traction. The curvature of the microcatheter body can be adjusted directly through the curvature adjusting device, so that the microcatheter body can adapt to blood vessels with different tortuosity angles and reach the lesion site smoothly. In addition, since the radiofrequency ablation microcatheter of the present invention does not have a guidewire cavity inside, the microcatheter body can be made into a microcatheter body with a smaller outer diameter (for example, an outer diameter of 5F) to treat more and thinner veins.

Description

Technical Field

[0001] The invention belongs to the technical field of medical devices, and in particular relates to a radiofrequency ablation microcatheter with adjustable curvature. Background Art

[0002] Varicose veins are the most common disease of the venous system. There are various causes for their formation, including congenital venous insufficiency of the lower limbs, arteriovenous fistula, sequelae of deep vein thrombosis, venous avalvularity, etc. The acquired factors are maintaining the same posture for a long time with little change, and blood accumulates in the lower limbs. Over time, the venous valves are damaged, resulting in excessive venous pressure and causing varicose veins.

[0003] Currently, the more efficient and safe treatment method is surgical intervention. During the operation, a catheter is inserted into the patient's diseased blood vessels. The catheter is equipped with a heating device and is connected to a radio frequency closure generator outside the body. The radio frequency energy can be transmitted to the diseased vascular tissue through the catheter heating device. The diseased blood vessels shrink due to the heat, and the fibrous layer undergoes inflammatory degeneration to completely block the varicose blood vessels, thereby achieving the purpose of treatment.

[0004] The existing venous ablation catheter has a minimum outer diameter of 7F, which is mainly used to treat varicose vein of the great saphenous vein. A guidewire cavity is installed in the middle of the catheter. During the operation, the catheter must rely on the guidewire to reach the diseased site in the patient's vein. There is a risk of perforation of the blood vessels by the guidewire during the operation. In addition, since varicose veins are not limited to the great saphenous vein, the small saphenous vein and venous communicating branches are also high-incidence sites of varicose veins. These veins have a thinner inner diameter and a more tortuous path. Existing catheters cannot smoothly reach the diseased site.

[0005] Therefore, it is necessary to provide an improved technical solution to address the above-mentioned deficiencies in the prior art. Summary of the invention

[0006] The purpose of the present invention is to provide a radiofrequency ablation microcatheter with adjustable curvature to solve the problem that the existing catheter cannot smoothly reach the lesion site.

[0007] In order to achieve the above object, the present invention provides the following technical solutions:

[0008] A radiofrequency ablation microcatheter with adjustable curvature, the radiofrequency ablation microcatheter comprising:

[0009] Microcatheter body;

[0010] a radio frequency coil, the radio frequency coil being wound around the distal end of the microcatheter tube body;

[0011] A handle connected to the proximal end of the microcatheter body;

[0012] A bending adjustment device is arranged on the handle and connected to the microcatheter body, and is used to adjust the curvature of the microcatheter body.

[0013] Optionally, the bending adjustment device comprises:

[0014] A gear assembly, wherein the gear assembly is arranged on the handle;

[0015] A stretch wire, one end of which is connected to the gear assembly, and the other end of which is connected to the distal end of the microcatheter body;

[0016] Rotating the gear assembly can drive the stretch wire to contract, causing the microcatheter body to deform and bend.

[0017] Optionally, the gear assembly comprises:

[0018] An adjusting gear, wherein the adjusting gear is arranged on the handle;

[0019] A driven disc, the driven disc being fixed on the adjusting gear, and one end of the stretching wire being wound around the driven disc;

[0020] Rotating the adjusting gear can drive the driven disk to rotate, and drive the stretching wire to contract, so that the microcatheter body is deformed and bent.

[0021] Optionally, the microcatheter tube body comprises an inner tube and an outer tube which are nested with each other, a fixing ring is arranged on the inner surface of the distal end of the outer tube, a stretching ring is installed on the fixing ring, and the stretching ring is located between the inner tube and the outer tube;

[0022] The distal end surface of the handle is provided with a connecting hole, the inner diameter of the connecting hole is adapted to the outer diameter of the outer tube, and the proximal outer wall of the outer tube is fixedly connected to the inner wall of the connecting hole;

[0023] The stretching steel wire passes through the connecting hole and is inserted between the inner tube and the outer tube, and the inserted end of the stretching steel wire is fixedly connected to the stretching ring.

[0024] Optionally, the number of the adjusting gears is four, and the four adjusting gears are evenly distributed along the circumference of the handle, and the number of the driven disks is four, and they are respectively fixed on the four adjusting gears;

[0025] There are four stretching rings, and the four stretching rings are evenly distributed along the circumference of the fixing ring;

[0026] The four stretching steel wires are arranged in four numbers, one end of the four stretching steel wires is respectively wound around the four driven disks, and the other end is correspondingly connected to the four stretching rings.

[0027] Optionally, a guide plate and four steel wire guide posts are provided inside the handle, the guide plate is provided close to the far end of the handle, and four steel wire passing holes are provided on the guide plate; the four steel wire guide posts are all provided on the inner side of the guide plate, and respectively correspond to the four steel wire passing holes, and the four steel wire guide posts and the guide plate are used to guide and position the four stretching steel wires.

[0028] Optionally, the radiofrequency ablation microcatheter further comprises:

[0029] A start chip, which is arranged inside the handle, connected to the radio frequency coil via a radio frequency heating line and a temperature sensing line, and a start button is arranged on the start chip;

[0030] A connecting tail wire, one end of which is connected to the start chip, and the other end of which passes through and is exposed at the proximal end of the handle;

[0031] A host connector, the host connector being connected to the exposed end of the connecting tail wire;

[0032] The guide plate is also provided with a heating wire through hole and an induction wire through hole, and the interior of the handle is also provided with a heating wire guide column and an induction wire guide column, which are respectively arranged corresponding to the heating wire through hole and the induction wire through hole, and are used to guide and position the RF heating wire and the temperature sensing wire.

[0033] Optionally, a movable switch button is provided on the handle corresponding to the start button, and the switch button can press the start button to connect the circuit on the start chip to heat the radio frequency coil.

[0034] Optionally, the radiofrequency ablation microcatheter further comprises a protective cover, which is disposed at the distal end of the handle, and the proximal end of the microcatheter body is inserted into the protective cover and fixedly connected to the distal end of the handle.

[0035] Optionally, a UV glue tip is provided at the distal end of the microcatheter body.

[0036] Beneficial effects:

[0037] The radiofrequency ablation microcatheter with adjustable curvature of the present invention comprises a microcatheter body, a radiofrequency coil wound around the distal end of the microcatheter body, a handle connected to the proximal end of the microcatheter body, and a bending device arranged on the handle and connected to the microcatheter body, wherein the radiofrequency coil can be used to transfer its radiofrequency energy to the diseased vascular tissue after being heated, the diseased blood vessels shrink due to heat, and the fiber layer undergoes inflammatory degeneration to completely block the varicose blood vessels, thereby achieving the purpose of treatment; the bending device can be used to adjust the curvature of the microcatheter body. The radiofrequency ablation microcatheter of the present invention has no guidewire cavity inside, and in the process of treating varicose veins, it can reach the lesion site without relying on guidewire traction, and the curvature of the microcatheter body can be directly adjusted by the bending device, so that the microcatheter body can adapt to blood vessels with different tortuosity angles and reach the lesion site smoothly. In addition, since the radiofrequency ablation microcatheter of the present invention has no guidewire cavity inside, the microcatheter body can be made into a microcatheter body with a smaller outer diameter (for example, an outer diameter of 5F) to treat more and thinner veins. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. Among them:

[0039] Figure 1 It is a structural schematic diagram of an embodiment of a radiofrequency ablation microcatheter with adjustable curvature of the present invention;

[0040] Figure 2 for Figure 1 Schematic diagram of the internal structure of a radiofrequency ablation catheter;

[0041] Figure 3 for Figure 1 The structural diagram of the central bending device;

[0042] Figure 4 for Figure 1 A schematic diagram of the arrangement of the central bending device from another perspective;

[0043] Figure 5 for Figure 1 Schematic diagram of the internal structure of the microcatheter body;

[0044] Figure 6 for Figure 5 Schematic diagram of the structure of the microcatheter tube after bending;

[0045] Figure 7 This is a schematic diagram of the microcatheter body after entering the human blood vessel.

[0046] Numbers in the figure: 1-microcatheter body; 11-outer tube; 12-inner tube; 13-fixing ring; 14-stretching ring; 15-UV rubber head; 2-radio frequency coil; 21-radio frequency heating wire; 22-temperature sensing wire; 3-handle; 31-steel wire guide column; 32-guide plate; 321-steel wire passing hole; 322-heating wire passing hole; 323-sensing wire passing hole; 33-sensing wire guide column; 34-positioning column; 35-mounting frame; 37-switch button; 38-grip; 4-bending device; 41-adjusting gear; 42-driven plate; 43-stretching steel wire; 5-host connector; 6-connecting tail line; 7-start chip; 71-start button; 9-protective cover; 10-human blood vessels. DETAILED DESCRIPTION

[0047] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention belong to the scope of protection of the present invention.

[0048] The present invention will be described in detail below in conjunction with embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0049] In view of the problem that the existing catheter cannot smoothly reach the lesion site, the present invention provides a radiofrequency ablation microcatheter. The radiofrequency ablation microcatheter provided by the present invention has no guidewire cavity inside. In the process of varicose vein treatment surgery, it can reach the lesion site without relying on guidewire traction. By directly adjusting the curvature of the microcatheter body 1, the microcatheter body 1 can adapt to blood vessels with different tortuosity angles and smoothly reach the lesion site. In addition, since the radiofrequency ablation microcatheter of the present invention has no guidewire cavity inside, the microcatheter body 1 can be made into a microcatheter body 1 with a smaller outer diameter (for example, an outer diameter of 5F) to treat more and thinner veins.

[0050] like Figure 1 As shown, the radio frequency ablation microcatheter of the present invention includes a microcatheter body 1, a radio frequency coil 2, a handle 3 and a bending adjustment device 4, wherein the radio frequency coil 2 is wound around the distal end of the microcatheter body 1, and the head end and the tail end of the radio frequency coil 2 are fixed with glue. After the radio frequency coil 2 is heated, it can be used to transfer its radio frequency energy to the diseased vascular tissue, the diseased blood vessels shrink due to heat, and the fiber layer undergoes inflammatory degeneration to completely block the varicose blood vessels, thereby achieving the purpose of treatment; the handle 3 is connected to the proximal end of the microcatheter body 1, and its connection method can be optionally glued and fixed; the bending adjustment device 4 is arranged on the handle 3 and connected to the microcatheter body 1, and is used to adjust the curvature of the microcatheter body 1 to adapt to blood vessels with different tortuosity angles and smoothly reach the diseased site.

[0051] It should be noted that the proximal end mentioned in the text refers to the end close to the surgical operator, and the distal end refers to the end far away from the surgical operator.

[0052] like Figures 2 to 4 As shown, in a specific embodiment of the present invention, the bending adjustment device 4 includes: a gear assembly and a stretching wire 43, the gear assembly is arranged on the handle 3; one end of the stretching wire 43 is connected to the gear assembly, and the other end is connected to the distal end of the microcatheter body 1; the rotating gear assembly can drive the stretching wire 43 to contract, so that the microcatheter body 1 is deformed and bent.

[0053] Among them, the gear assembly includes an adjusting gear 41 and a driven disk 42, the adjusting gear 41 is arranged on the handle 3; the driven disk 42 is fixed on the adjusting gear 41, and can rotate along with the adjusting gear 41; one end of the stretching wire 43 is wound around the driven disk 42, and the other end is connected to the distal inner wall of the microcatheter body 1; rotating the adjusting gear 41 can drive the driven disk 42 to rotate, and drive the stretching wire 43 to contract, so that the microcatheter body 1 is deformed and bent.

[0054] It should be noted that when the curvature of the microcatheter body 1 needs to be adjusted, the manual rotation of the adjusting gear 41 drives the driven disk 42 to rotate, thereby driving the tensile wire 43 to contract, so that the microcatheter body 1 can be deformed and bent.

[0055] In this embodiment, part of the adjusting gear 41 is located inside the handle 3, and part of it is exposed outside the handle 3 and can rotate relative to the handle 3. A mounting frame 35 is provided on the handle 3, and the mounting frame 35 is generally U-shaped. The adjusting gear 41 and the driven disk 42 are correspondingly provided with mounting holes (not shown), and are sleeved on the mounting frame 35 through the mounting holes, so that the adjusting gear 41 and the driven disk 42 can be installed, and the adjusting gear 41 and the driven disk 42 can rotate relative to the mounting frame 35 to achieve the contraction and release of the tensile wire 43.

[0056] like Figure 5 and Figure 6In a specific embodiment of the present invention, the microcatheter tube body 1 includes an inner tube 12 and an outer tube 11 which are nested with each other, a fixing ring 13 is provided on the inner surface of the distal end of the outer tube 11, and the fixing ring 13 is bonded to the inner surface of the outer tube 11 by strong glue; a stretching ring 14 is installed on the fixing ring 13, and the stretching ring 14 is located between the inner tube 12 and the outer tube 11; a connecting hole (not marked) is provided on the distal end surface of the handle 3, the inner diameter of the connecting hole is matched with the outer diameter of the outer tube 11, the proximal outer wall of the outer tube 11 is fixedly connected to the inner wall of the connecting hole, and the proximal outer wall of the outer tube 11 can be glued and fixed to the inner wall of the connecting hole; a stretching wire 43 passes through the connecting hole and is penetrated between the inner tube 12 and the outer tube 11, and the penetrated end of the stretching wire 43 is fixedly connected to the stretching ring 14 (the fixed connection method is soldering). With such a structural design, when the curvature of the microcatheter body 1 needs to be adjusted, the manually rotated adjusting gear 41 drives the driven disk 42 to rotate, thereby driving the stretching wire 43 to contract. The stretching wire 43 will pull the stretching ring 14, so that the corresponding fixing ring 13 is stressed, causing the microcatheter body 1 to deform and bend.

[0057] Refer again Figure 4 , Figure 5 and Figure 6 In a specific embodiment of the present invention, four adjusting gears 41 are provided, and the four adjusting gears 41 are evenly distributed along the circumference of the handle 3, that is, the adjusting gears 41 are arranged vertically up, down, left and right in the handle 3, and in the circumferential direction of the handle 3, the angle between two adjacent adjusting gears 41 is 90°; four driven disks 42 are provided, which are respectively fixed on the four adjusting gears 41, and can realize synchronous rotation with the corresponding adjusting gears 41; accordingly, four stretching rings 14 are provided, and the four stretching rings 14 are evenly distributed along the circumference of the fixed ring 13; four stretching steel wires 43 are provided, one end of the four stretching steel wires 43 is respectively wound on the four driven disks 42, and the other end is correspondingly connected to the four stretching rings 14, and the four stretching steel wires 43 are all passed between the outer tube 11 and the inner tube 12. With such a structural design, by adjusting the rotation of the four adjusting gears 41, the corresponding driven disk 42 is driven to rotate. The rotation of the driven disk 42 can pull the corresponding stretching wire 43 to make a linear motion. The stretching wire 43 then pulls the corresponding stretching ring 14, thereby driving the corresponding fixed ring 13 to move together. Adjusting the adjusting gears 41 at different points will cause the fixed ring 13 at the corresponding point to be stretched, thereby causing the microcatheter tube body 1 to deform and bend.

[0058] It should be noted that the four adjusting gears 41 and the corresponding driven disks 42 are all fixed on the handle 3 through the mounting frame 35 , and are rotatable relative to the mounting frame 35 .

[0059] Furthermore, in order to make the routing layout of the four stretching steel wires 43 more reasonable, a guide plate 32 and four steel wire guide columns 34 are provided inside the handle 3. The guide plate 32 is arranged near the far end of the handle 3, and four steel wire passing holes 321 are provided on the guide plate 32 for allowing the four stretching steel wires 43 to pass through; the four steel wire guide columns 31 are all arranged on the inner side of the guide plate 32, and are respectively arranged corresponding to the four steel wire passing holes 321; the four steel wire guide columns 31 and the guide plate 32 are used to guide and position the four stretching steel wires 43, that is, the four stretching steel wires 43 smoothly change the routing direction through the corresponding steel wire guide columns 34, and then the four stretching steel wires 43 are track-positioned through the guide plate 32.

[0060] The bending adjustment device 4 of the present invention is relatively simple to operate. During the operation, the operator can manually adjust the bending in two directions while holding the handle 3 with one hand.

[0061] like Figure 1 and Figure 2 As shown, the radiofrequency ablation microcatheter also includes: a start chip 7, a connecting tail line 6 and a host connector 5, wherein the start chip 7 is arranged inside the handle 3, and the start chip 7 is connected to the radiofrequency coil 2 through a radiofrequency heating line 21 and a temperature sensing line 22, wherein the radiofrequency heating line 21 is used to heat the radiofrequency coil 2, and the temperature sensing line 22 is used to sense the temperature of the radiofrequency coil 2 in real time; a start button 71 is arranged on the start chip 7; one end of the connecting tail line 6 is connected to the start chip 7, and the other end passes through and is exposed at the proximal end of the handle 3; and the host connector 5 is connected to the exposed end of the connecting tail line 6. When the microcatheter body 1 enters the lesion site in the blood vessel, the host connector 5 is connected to the external host, and the start button 71 on the start chip 7 is pressed to connect the circuit of the start chip 7, and the radiofrequency coil 2 can be heated by the radiofrequency heating line 21. After the radiofrequency coil 2 is heated, the radiofrequency energy will be transmitted to the lesion blood vessel tissue, and the lesion blood vessel will shrink due to heat, and the fibrous layer will undergo inflammation and degeneration to completely block the varicose blood vessel, thereby achieving the purpose of treatment.

[0062] It should be noted that the RF heating wire 21 and the temperature sensing wire 22 are routed in the gap between the inner tube 12 and the outer tube 11, and the RF coil 2 is wound on the outer tube 11. The outer tube 11 is provided with a heating wire through hole (not shown) and a sensing wire through hole (not shown) at the RF coil 2. The RF heating wire 21 and the temperature sensing wire 22 are connected to the RF coil 2 after passing through the heating wire through hole and the sensing wire through hole respectively.

[0063] like Figure 2As shown, in a specific embodiment of the present invention, the start chip 7 is fixed in the handle 3 through a positioning column 34. Specifically, the handle 3 is provided with a positioning column 34, and the start chip 7 is provided with a positioning hole corresponding thereto. The start chip 7 is fixed in the handle 3 through the cooperation between the positioning hole and the positioning column 34. Optionally, four positioning columns 34 are provided at intervals, and four positioning holes are provided correspondingly, so that the stability of the setting of the start chip 7 can be ensured.

[0064] Furthermore, a movable switch button 37 is provided at the position of the handle 3 corresponding to the start button 71. After the host connector 5 is connected to the external host, the switch button 37 on the handle 3 can be manually pressed. The switch button 37 contacts and presses the start button 71, so that the circuit on the start chip 7 is connected, thereby heating the RF coil 2. Specifically, a through hole (not shown) is provided at the position of the handle 3 corresponding to the start button 71. The switch button 37 is inserted into the through hole, and the switch button 37 is elastically connected to the start button 71 (a spring can be used). Manually pressing the switch button 37 can contact and press the start button 71.

[0065] Furthermore, the guide plate 32 is also provided with a heating wire through hole 322 and a sensing wire through hole 323, that is, six through holes are provided on the guide plate 32; the interior of the handle 3 is also provided with a heating wire guide column (not shown) and a sensing wire guide column 33, which are respectively arranged corresponding to the heating wire through hole 322 and the sensing wire through hole 323, and are used to guide and position the RF heating wire 21 and the temperature sensing wire 22, so that their wiring layout is more reasonable.

[0066] Further, refer again to Figure 1 and Figure 2 The radiofrequency ablation microcatheter also includes a protective cover 9, which is arranged at the distal end of the handle 3. The proximal end of the microcatheter body 1 is inserted into the protective cover 9 and fixedly connected to the distal end of the handle 3; the protective cover 9 is roughly conical and can be used to protect the microcatheter body 1 from bending or breaking when operating the handle 3.

[0067] It should be noted that the protective cover 9 and the distal end of the handle 3 are connected by adhesive bonding, which is easy to operate and has a relatively firm connection.

[0068] The outer contour of the handle 3 of the present invention is cylindrical, and the concave structure on the proximal outer surface is a gripping portion 38, so that the operator can conveniently hold the handle 3. The handle 3 can be a split shell structure to facilitate the assembly operation of the various components inside the handle 3.

[0069] Furthermore, if Figure 1 , Figure 5 and Figure 6As shown, a UV glue head 15 is provided at the distal end of the microcatheter body 1. The UV glue head 15 is hemispherical and is cured by ultraviolet light. The UV glue is soft and elastic and will not scratch the blood vessels.

[0070] like Figure 7 As shown, when the radiofrequency ablation microcatheter of the present invention is used to treat varicose veins, the condition of the human blood vessel 10 can be observed by an in vitro ultrasonic probe first, and when the microcatheter body 1 enters the human blood vessel 10 and reaches the bifurcation or bend of the blood vessel, the microcatheter body 1 can be deformed and bent by operating the bending device 4, so as to smoothly and efficiently reach the tortuous or very narrow position of the blood vessel. The operation is simple and easy, making the operation process safer and more reliable.

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A radiofrequency ablation microcatheter with adjustable curvature, characterized in that: The radiofrequency ablation microcatheter comprises: Microcatheter body; a radio frequency coil, the radio frequency coil being wound around the distal end of the microcatheter tube body; A handle connected to the proximal end of the microcatheter body; A bending adjustment device, which is arranged on the handle and connected to the microcatheter body, and is used to adjust the curvature of the microcatheter body; The bending adjustment device comprises: A gear assembly, wherein the gear assembly is arranged on the handle; A stretch wire, one end of which is connected to the gear assembly, and the other end of which is connected to the distal end of the microcatheter body; Rotating the gear assembly can drive the stretch wire to contract, causing the microcatheter body to deform and bend; The gear assembly comprises: An adjusting gear, wherein the adjusting gear is arranged on the handle; A driven disc, the driven disc being fixed on the adjusting gear, and one end of the stretching wire being wound around the driven disc; Rotating the adjusting gear can drive the driven disk to rotate, and drive the stretching wire to contract, so that the microcatheter body is deformed and bent; The microcatheter body comprises an inner tube and an outer tube which are nested with each other, a fixing ring is arranged on the inner surface of the distal end of the outer tube, a stretching ring is installed on the fixing ring, and the stretching ring is located between the inner tube and the outer tube; The distal end surface of the handle is provided with a connecting hole, the inner diameter of the connecting hole is adapted to the outer diameter of the outer tube, and the proximal outer wall of the outer tube is fixedly connected to the inner wall of the connecting hole; The stretching steel wire passes through the connecting hole and is inserted between the inner tube and the outer tube, and the inserted end of the stretching steel wire is fixedly connected to the stretching ring; The number of the adjusting gears is four, and the four adjusting gears are evenly distributed along the circumference of the handle. The number of the driven disks is four, and they are respectively fixed on the four adjusting gears. There are four stretching rings, and the four stretching rings are evenly distributed along the circumference of the fixing ring; The stretching steel wires are provided in four numbers, one end of each of the four stretching steel wires is wound around the four driven disks respectively, and the other end is connected to the four stretching rings respectively; A guide plate and four steel wire guide posts are arranged inside the handle, the guide plate is arranged near the distal end of the handle, and four steel wire passing holes are arranged on the guide plate; The four steel wire guide posts are all arranged on the inner side of the guide plate and are respectively arranged corresponding to the four steel wire passing holes; The four steel wire guide posts and the guide disc are used to guide and position the four stretching steel wires; The radiofrequency ablation microcatheter also includes: A start chip, which is arranged inside the handle, connected to the radio frequency coil via a radio frequency heating line and a temperature sensing line, and a start button is arranged on the start chip; A connecting tail wire, one end of which is connected to the start chip, and the other end of which passes through and is exposed at the proximal end of the handle; A host connector, the host connector being connected to the exposed end of the connecting tail wire; The guide plate is also provided with a heating wire through hole and an induction wire through hole, and the interior of the handle is also provided with a heating wire guide column and an induction wire guide column, which are respectively arranged corresponding to the heating wire through hole and the induction wire through hole, and are used to guide and position the RF heating wire and the temperature sensing wire.

2. The radiofrequency ablation microcatheter with adjustable curvature as claimed in claim 1, characterized in that: A movable switch button is provided at a position of the handle corresponding to the start button, and the switch button can press the start button to connect the circuit of the start chip to heat the radio frequency coil.

3. The radiofrequency ablation microcatheter with adjustable curvature according to any one of claims 1 to 2, characterized in that: The radiofrequency ablation microcatheter also includes a protective cover, which is arranged at the distal end of the handle. The proximal end of the microcatheter body is inserted into the protective cover and fixedly connected to the distal end of the handle.

4. The radiofrequency ablation microcatheter with adjustable curvature according to any one of claims 1 to 2, characterized in that: A UV glue head is arranged at the distal end of the microcatheter tube body.

Images