Venous closed radiofrequency ablation assembly

Abstract

The utility model discloses a vein closure radiofrequency ablation component, including handle, catheter and ablation electrode that connect in proper order, the ablation electrode is provided at the front end of catheter, the rear end of catheter extends to handle rear end and is connected with joint, the inside of catheter is hollow structure, joint and the inside of catheter are communicated and are used for the leading wire to pass through before the operation. The ablation electrode is reliable in structure, simple in structure, stable, reliable and convenient to operate, normal saline is instilled to the ablation electrode in an operation to conduct the electrode tip and the outer tube, low-temperature plasma is generated under excitation of radio-frequency current to ablate varicose blood vessels, meanwhile, the high-resistance metal electrode tip is powered on to emit heat, the blood vessels are secondarily heated, and the ablation effect of the high-resistance metal electrode tip is improved. Compared with a coil type catheter, the ablation temperature is not too high, the ablation range is relatively small, tissues are not prone to adhesion, and the vein ablation closing effect is improved.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to a radiofrequency ablation component for venous closure. Background Technology

[0002] Varicose veins of the lower extremities are the most common vascular disease, with varicose veins of the great saphenous vein being the most prevalent. Clinically, varicose veins manifest as varicose veins on the superficial skin of the legs, resembling earthworms. These veins appear in clusters or nodules, protruding noticeably from the skin. Other major symptoms include skin pigmentation, even ulceration, pain, swelling, burning sensation, and itching. The pathological mechanisms of varicose veins are complex, primarily involving weak vein walls, congenital venous valve defects, high superficial venous pressure, environmental factors, and genetics. It is the most prominent symptom of chronic venous insufficiency, significantly impacting patients' quality of life and appearance.

[0003] Surgical treatments for varicose veins include traditional high ligation and stripping of the great saphenous vein, laser therapy, radiofrequency ablation, microwave therapy, electrocoagulation, and transillumination excision. Each of these procedures has its advantages and disadvantages. Overall, radiofrequency ablation is considered the best treatment. It generates high temperatures, causing endothelial denaturation, collagen contraction, thickening of the vessel wall, and lumen contraction, leading to rapid organization and fibrosis, ultimately resulting in venous closure. For example, the radiofrequency closure catheter disclosed in Chinese patent application number CN202111200587.7 uses a long, coiled heating wire to form a heating coil, which closes the vein through heat conduction. This type of catheter can achieve ablation temperatures as high as 100°C. However, excessively high temperatures or overly large ablation areas can cause tissue necrosis and scab formation, which can adhere to the coil and affect the effectiveness of venous closure. Utility Model Content

[0004] To address the aforementioned technical problems, this invention provides a radiofrequency ablation component for venous closure.

[0005] The technical solution of this utility model to solve the above technical problems is as follows: A venous closure radiofrequency ablation component includes a handle, a catheter and an ablation electrode connected in sequence. The ablation electrode is set at the front end of the catheter, the rear end of the catheter extends to the rear end of the handle and is connected to a connector. The inside of the catheter is a hollow structure, and the connector is connected to the inside of the catheter and is used to pass a guide wire before the operation.

[0006] The catheter includes an outer tube, an insulating tube, and an inner tube arranged sequentially from the outside to the inside. The front end of the inner tube extends beyond the front ends of the insulating tube and the outer tube, and the front end of the inner tube has a progressively expanding opening structure. The ablation electrode is placed outside the front end of the inner tube. A gap is formed between the insulating tube and the outer tube, and a wire extending from the handle to the ablation electrode is inserted through the gap.

[0007] Furthermore, the ablation electrode includes an electrode head and an insulating head. The electrode head is sleeved outside the front end of the inner tube, and the insulating head is disposed between the electrode head and the outer tube. The tail of the insulating head is inserted into the gap between the outer tube and the insulating tube. The insulating head has a thermocouple mounting hole formed at the connection with the outer tube, and a thermocouple for detecting the temperature of the electrode head is disposed in the thermocouple mounting hole.

[0008] Furthermore, the front end of the electrode head has a progressively narrowing opening structure, and the outer surface is provided with an anti-stick coating.

[0009] Furthermore, a circular protrusion is provided inside the electrode head, which abuts against the opening at the front end of the inner tube to achieve positioning.

[0010] Furthermore, the handle includes a housing and connectors, buttons, and circuit boards respectively disposed on the housing. The buttons are electrically connected to the circuit boards, and the lead wires of the electrode head and the lead wires of the thermocouple are connected to the circuit boards. The on / off state of the radiofrequency ablation circuit is controlled by the buttons and the circuit boards. The connectors are connected to the inner tube for guiding the electrode head by inserting a guide wire before the operation.

[0011] Furthermore, the wires include a positive wire connected to the electrode head, a negative wire located inside the outer tube, and a thermocouple wire connected to the thermocouple.

[0012] Furthermore, the electrode head is a high-resistivity metal component.

[0013] The present invention has the following beneficial effects: The venous closure radiofrequency ablation component provided by the present invention has a reliable, simple, stable and reliable structure and is easy to operate. During the operation, physiological saline is dripped into the ablation electrode to connect the electrode head with the outer tube. Under the excitation of radiofrequency current, low-temperature plasma is generated to ablate the varicose veins. At the same time, the high-resistance metal electrode head is energized and heated to provide secondary heating to the blood vessels. Compared with coil catheters, the ablation temperature is not too high, the ablation range is relatively small, and the tissue is less likely to adhere, thus improving the ablation and closure effect of the venous vessels. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the catheter and ablation electrode structure in this utility model;

[0016] Figure 3 This is a cross-sectional view of the catheter and ablation electrode in this utility model;

[0017] Figure 4 This is a schematic diagram of the handle structure in this utility model;

[0018] Figures 1 to 4The reference numerals in the attached figures are respectively: 1-handle, 2-conduit, 3-ablation electrode, 4-connector, 20-outer tube, 21-insulating tube, 22-inner tube, 30-electrode head, 31-insulating head, 32-thermocouple mounting hole, 10-outer shell, 11-button, 12-circuit board. Detailed Implementation

[0019] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0020] like Figure 1 As shown, a radiofrequency ablation assembly for venipuncture includes a handle 1, a catheter 2, and an ablation electrode 3 connected in sequence. The ablation electrode 3 is located at the front end of the catheter 2, and the rear end of the catheter 2 extends to the rear end of the handle 1 and is connected to a connector 4. The catheter 2 has a hollow internal structure, and the connector 4 communicates with the interior of the catheter 2 and is used for preoperative insertion of a guide wire. The handle 1, as the main part for the physician's operation, is designed for easy gripping and manipulation while ensuring sufficient stability and safety. The catheter 2 is the key part connecting the handle 1 and the ablation electrode 3, responsible for guiding the ablation electrode 3 to the target vein. The ablation electrode 3 is the core part of the assembly; it generates radiofrequency energy to close the vein by contacting the vein wall. The connector 4 is used for preoperative insertion of a guide wire and / or intraoperative infusion of saline solution to the ablation electrode 3.

[0021] like Figures 2 to 3As shown, catheter 2 includes an outer tube 20, an insulating tube 21, and an inner tube 22 arranged sequentially from the outside in. The front end of the inner tube 22 extends beyond the insulating tube 21 and the outer tube 20, and the front end of the inner tube 22 has a progressively expanding opening structure. The ablation electrode 3 is disposed outside the front end of the inner tube 22. A gap is formed between the insulating tube 21 and the outer tube 20, and a wire extending from the handle 1 to the ablation electrode 3 is threaded through the gap. The outer tube 20, as the outermost layer of catheter 2, mainly serves a protective and supportive function. The insulating tube 21, located between the outer tube 20 and the inner tube 22, mainly serves an electrical insulation function. Since the ablation electrode 3 generates radiofrequency energy, the presence of the insulating tube 21 can prevent energy leakage, thereby protecting the patient from accidental injury. The inner tube 22 is the innermost layer of catheter 2, responsible for guiding the ablation electrode 3 to the target location. The front end of the inner tube 22 extends beyond the insulating tube 21 and the outer tube 20, forming an ablation area that directly contacts the vein wall. The tip of the inner tube 22 is designed with a progressively expanding opening structure. This design helps to better adapt to changes in the vein's morphology during the procedure. As the catheter 2 is advanced to the target location, the progressively expanding opening structure gradually unfolds, ensuring full contact between the ablation electrode 3 and the vein wall. The ablation electrode 3 is positioned outside the tip of the inner tube 22 and is responsible for generating radiofrequency energy to close the vein. Because the opening structure at the tip of the inner tube 22 is progressively expanding, the ablation electrode 3 can also better adapt to the vein's morphology, ensuring uniform and effective energy delivery.

[0022] The ablation electrode 3 includes an electrode head 30 and an insulating head 31. The electrode head 30 is fitted onto the front end of the inner tube 22, and the insulating head 31 is positioned between the electrode head 30 and the outer tube 20, with its tail inserted into the gap between the outer tube and the insulating tube. A thermocouple mounting hole 32 is formed at the connection point with the outer tube on the insulating head, and a thermocouple for detecting the temperature of the electrode head 30 is installed within the thermocouple mounting hole 32. The electrode head 30 is the core component of the ablation electrode 3; it is responsible for generating radiofrequency energy to heat and close the vein. The electrode head 30 is fitted onto the front end of the inner tube 22 to ensure direct contact with the vein wall, thereby achieving effective energy transfer. The electrode head 30 is made of a high-resistance metal, such as a copper-nickel alloy. The front end of the electrode head 30 has a progressively narrowing opening structure, and its outer surface is coated with an anti-adhesion coating. This anti-adhesion coating reduces adhesion between the electrode head 30 and the vein wall, lowering frictional resistance during the procedure. The electrode head 30 has a circular protrusion inside, which abuts against the opening at the front end of the inner tube 22, thereby achieving a limiting position.

[0023] An insulating head 31 is positioned between the electrode head 30 and the outer tube 20, serving as electrical insulation. Its tail is inserted between the outer tube 20 and the insulating tube 21, forming a stable support structure that protects the electrode head 30 and prevents accidental energy leakage. The gap between the insulating head 31 and the outer tube 20 is cleverly designed as a thermocouple mounting hole. This hole design not only facilitates the installation and fixation of the thermocouple but also ensures good contact between the thermocouple and the electrode head 30, thereby enabling accurate temperature detection of the electrode head 30.

[0024] like Figure 4 As shown, the handle 1 includes a housing 10, a button 11, and a circuit board 12. A connector 4 is mounted on the housing 10. The button 11 is electrically connected to the circuit board 12. The leads of the electrode head 30 and the thermocouple are connected to the circuit board 12. The button 11 and the circuit board 12 control the on / off state of the radiofrequency ablation circuit. The connector 4 is connected to the inner tube 22 for preoperative placement of a guide wire to guide the electrode head 30. The leads include a positive lead connected to the electrode head 30, a negative lead located inside the outer tube 20, and a thermocouple lead connected to the thermocouple. Connector 4 is a Luer connector 4 with a through hole, which is connected to the inner tube 22, facilitating the preoperative guidance of the guide wire to guide the electrode head 30. During the procedure, physiological saline is dripped onto the ablation electrode 3 to connect the electrode head 30 to the outer tube 20. Under the excitation of radiofrequency current, low-temperature plasma of 40-70℃ is generated to ablate varicose veins. At the same time, the high-resistance metal electrode head 30 is energized and heated to provide secondary heating to the blood vessels. Compared with the coil catheter 2, the ablation temperature is not too high, the ablation range is relatively small, and the tissue is less likely to adhere, thus improving the ablation and closure effect of the vein.

[0025] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A venous closure radiofrequency ablation assembly, comprising: The device includes a handle (1), a catheter (2), and an ablation electrode (3) connected in sequence. The ablation electrode (3) is located at the front end of the catheter (2). The rear end of the catheter (2) extends to the rear end of the handle (1) and is connected to a connector (4). The interior of the catheter (2) is hollow. The connector (4) is connected to the interior of the catheter (2). The catheter (2) includes an outer tube (20), an insulating tube (21), and an inner tube (22) arranged sequentially from the outside to the inside. The front end of the inner tube (22) extends outside the front ends of the insulating tube (21) and the outer tube (20), and the front end of the inner tube (22) has a progressively expanding opening structure. The ablation electrode (3) is disposed outside the front end of the inner tube (22). A gap is formed between the insulating tube (21) and the outer tube (20), and the gap is used to pass through a wire extending from the handle (1) to the ablation electrode (3).

2. The venous closure radiofrequency ablation assembly of claim 1, wherein, The ablation electrode (3) includes an electrode head (30) and an insulating head (31). The electrode head (30) is sleeved on the outside of the front end of the inner tube (22). The insulating head (31) is disposed between the electrode head (30) and the outer tube (20), and the tail of the insulating head (31) is inserted into the gap between the outer tube (20) and the insulating tube (21). The insulating head (31) has a thermocouple mounting hole formed at the connection with the outer tube (20). A thermocouple for detecting the temperature of the electrode head (30) is disposed in the thermocouple mounting hole.

3. The venous closure radiofrequency ablation assembly of claim 2, wherein, The front end of the electrode head (30) is a gradually narrowing opening structure, and the outer surface is provided with an anti-stick coating.

4. The venous closure radiofrequency ablation assembly of claim 2, wherein, The electrode head (30) is provided with a circular protrusion, which abuts against the opening at the front end of the inner tube (22) to achieve a limiting position.

5. The venous closure radiofrequency ablation assembly of claim 2, wherein, The handle (1) includes a housing (10), a button (11), and a circuit board (12). A connector (4) is disposed on the housing (10). The button (11) is electrically connected to the circuit board (12). The wires of the electrode head (30) and the wires of the thermocouple are connected to the circuit board (12). The on / off state of the radiofrequency ablation circuit is controlled by the button (11) and the circuit board (12). The connector (4) is connected to the inner tube (22) for guiding the electrode head (30) with a guide wire before the operation.

6. The venous closure radiofrequency ablation assembly of claim 5, wherein, The wires include a positive wire connected to the electrode head (30), a negative wire located inside the outer tube (20), and a thermocouple wire connected to the thermocouple.

7. The venous closure radio frequency ablation assembly according to any one of claims 2 to 6, wherein, The electrode head (30) is a high-resistivity metal component.

8. The venous closure radiofrequency ablation assembly of claim 7, wherein, The connector (4) is used to pass through the guide wire before the procedure and / or to drip physiological saline into the ablation electrode (3) during the procedure.

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