Bundled radiofrequency ablation electrode
By integrating multiple electrode needle bodies on the same handle and designing a bundled radio frequency ablation electrode, the problem of limited treatment range in the prior art is solved, wider tissue ablation and higher therapeutic effects are achieved, and tissue damage is avoided through temperature control function.
Patent Information
- Application Number
- CN202421785979.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-26
- Publication Date
- 2025-05-30
- Estimated Expiration
- 2034-07-26
AI Technical Summary
The existing radiofrequency ablation electrodes have limited treatment range due to the limitations of electrode diameter and working section length, especially in large tumor lesions, and are inconvenient to operate.
A bundled radio frequency ablation electrode is designed, by integrating multiple electrode needle bodies on the same handle, each electrode needle body including an outer needle tube and an inner capillary tube, forming a cooling channel, and installing a temperature measuring couple at the needle tip to achieve the cluster effect and temperature control function.
The scope of tissue ablation is effectively expanded and the treatment effect is improved. At the same time, through the design of cooling channels and temperature measurement couples, effective temperature control of the treatment area is achieved, avoiding tissue carbonization and maintaining low impedance of the tissue.
Smart Images
Figure CN222917606U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of medical devices, in particular to a cluster type radiofrequency ablation electrode. Background Art
[0002] The radiofrequency ablation electrode adopts the principle of radiofrequency ablation. A radiofrequency current is provided to the electrode needle inserted into the target tissue through a generator. The molecules in the target tissue attempt to follow the trajectory of the current and collide and rub against each other to generate heat, causing the local temperature of the target tissue and its surrounding area to rise to 60 - 120 °C, so as to make the target tumor cells coagulate and necrosis.
[0003] Due to the limitations of the electrode diameter and the working section length allowed to enter the tissue, the existing radiofrequency ablation electrodes have a limited treatment range. Especially when applied to some large tumor lesion areas, the treatment effect is poor. While using multiple radiofrequency ablation electrodes for treatment, it is necessary to fix the handle of each radiofrequency ablation electrode, which is inconvenient to operate. Content of the Utility Model
[0004] To solve the deficiencies of the above-mentioned prior art, the utility model provides a cluster type radiofrequency ablation electrode, which effectively expands the range of tissue ablation and improves the treatment effect.
[0005] The technical solution of the utility model is as follows: The cluster type radiofrequency ablation electrode includes a handle and an electrode needle body. The electrode needle body has at least two, and is arranged in parallel on the top of the handle. Each electrode needle body includes an outer needle tube and a capillary inner tube penetrating through the inside of the outer needle tube. A cooling channel communicating with the inside of the capillary inner tube is formed between the outer needle tube and the capillary inner tube. The upper end of the outer needle tube is fixed with a needle tip, and the lower end of the outer needle tube penetrates into the handle and is electrically connected to a radiofrequency wire to input a radiofrequency current on the outer needle tube of each electrode needle body. A temperature measuring thermocouple is installed at one end of the needle tip close to the capillary inner tube to monitor the temperature of the needle tip area. Multiple electrode needle bodies are integrally installed on the same handle, and the outer needle tubes of each electrode needle body are electrically connected to the radiofrequency wire. The multiple electrode needle bodies produce a clustering effect, so that the treatment range of the ablation electrode is effectively improved. At the same time, a cooling channel is arranged in each electrode needle body to timely take away the heat in the tissue near the working section. A temperature measuring thermocouple is arranged at each needle tip to synchronously and effectively monitor the temperature of the working section of each outer needle tube, so as to achieve a temperature control effect within an effective range to avoid carbonization of the tissue in the treatment area and maintain the low impedance of the tissue.
[0006] The electrode needle body is three, and is distributed in an equilateral triangle on the top of the handle. The center distance between the outer needle tubes of adjacent electrode needle bodies is 3 - 3.5 times the outer diameter of the outer needle tube.
[0007] An insulating layer is coated on the outer side of each outer needle tube. One end of the insulating layer extends to the connection between the outer needle tube and the handle, and the outer needle tube between the other end of the insulating layer and the needle tip forms the working section of the outer needle tube.
[0008] A cold circulation component is fixed inside the handle. An upper water pipe and a return water pipe are connected to the cold circulation component. The lower ends of each outer needle tube are connected to the upper water pipe through the cold circulation component, and the parts of the lower ends of each capillary inner tube extending out of the outer needle tube are connected to the return water pipe through the cold circulation component.
[0009] The cold circulation component is a circulation tank. The circulation tank is divided into an upper water chamber and a return water chamber by a partition plate along the direction away from the electrode needle body. An inlet seat for connecting the upper water pipe is formed on the partition plate, and an outlet seat for connecting the return water pipe is formed on the side of the circulation tank away from the electrode needle body. Each outer needle tube penetrates through the cold circulation tank and communicates with the upper water chamber, and each capillary inner tube penetrates through the partition plate and communicates with the return water chamber. The wire end of the temperature measuring thermocouple enters the return water chamber along the capillary inner tube and then passes through the circulation tank.
[0010] The needle tip includes a pointed head part and a connecting part. The pointed head part is located outside the outer needle tube and is pyramid-shaped. The connecting part is fitted and installed inside the outer needle tube, and an embedded groove for fixing the temperature measuring thermocouple is formed on the connecting part. The temperature measuring thermocouple is installed in the embedded groove and is isolated from the circulating water in the cooling channel, so as to avoid the circulating water affecting its temperature measurement accuracy.
[0011] A conductive frame is provided at the connection position between the outer needle tube and the RF wire. The inner side of the conductive frame is welded to each outer needle tube, and the outer side of the conductive frame is welded to the RF wire. Compared with single wire connection, the conductive frame improves the stability of the electrical connection between each outer needle tube.
[0012] A support plate is fixed at the position between the top of the handle and the circulation tank. A through hole for each outer needle tube to pass through is formed on the support plate. The setting of the support plate, together with the top of the handle and the circulation tank, completes the internal fixation of the outer needle tube, further improves the stability between multiple outer needle tubes, and avoids the influence of the operation shaking of the outer needle tube outside the handle on the electrical welding inside the outer needle tube.
[0013] A plurality of annular protrusions are formed on the outer side of the circulation tank, and an annular installation groove matched with the annular protrusions is formed on the inner side of the handle.
[0014] It includes an indicator light and an annular magnet. The indicator light is arranged through the handle. The annular magnet is arranged outside the area composed of each outer needle tube and is embedded and installed on the support plate. A magnetic induction coil electrically connected to the indicator light is wound on the annular magnet.
[0015] The beneficial effects of the present utility model are as follows: In this solution, multiple electrode needle bodies are integrally installed on the same handle, and the outer needle tubes of each electrode needle body are electrically connected to the radiofrequency wires. The multiple electrode needle bodies produce a cluster effect, thereby effectively improving the treatment range of the ablation electrode. At the same time, cooling channels are provided in each electrode needle body to timely remove the heat in the tissue near the working section. Temperature measuring thermocouples are provided at the tips of each needle to synchronously and effectively monitor the temperature of the working sections of each outer needle tube, so as to achieve a temperature control effect within the effective range, avoid carbonization of the tissue in the treatment area, and maintain the low impedance of the tissue. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 is a schematic structural diagram of the present utility model;
[0017] Figure 2 is a schematic cross-sectional view inside the handle of the present utility model;
[0018] Figure 3 is a schematic cross-sectional view of the connection between the tip and the outer needle tube of the present utility model;
[0019] Figure 4 is a schematic structural diagram of the present utility model with the handle removed.
[0020] Reference numerals: 1. Handle; 101. Annular mounting groove; 2. Outer needle tube; 3. Capillary inner tube; 301. Cooling channel; 4. Tip; 401. Tip part; 402. Connection part; 403. Embedded groove; 5. Temperature measuring thermocouple; 6. Circulation tank; 601. Water inlet chamber; 602. Water return chamber; 603. Partition board; 604. Water inlet seat; 605. Water outlet seat; 606. Annular protrusion; 7. Radiofrequency wire; 8. Water supply pipe; 9. Water return pipe; 10. Support plate; 11. Conductive frame; 12. Annular magnet; 13. Indicator light; 14. Magnetic induction coil. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0021] To enable those skilled in the art to better understand the technical solutions in the present utility model, the technical solutions in the present utility model will be clearly and completely described below with reference to the accompanying drawings. Other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present utility model.
[0022] Such as Figure 1 and Figure 3As shown in the figure, the utility model provides a cluster-type radiofrequency ablation electrode, which includes a handle 1 and a main body of the electrode needle. The main body of the electrode needle is at least two, and is arranged in parallel on the top of the handle 1. In this embodiment, the main body of the electrode needle is three, and is distributed in an equilateral triangle on the top of the handle 1. Each main body of the electrode needle includes an outer needle tube 2 and a capillary inner tube 3 penetrating through the inside of the outer needle tube 2. Among them, the center distance between the outer needle tubes 2 of adjacent main bodies of the electrode needle is 3-3.5 times the outer diameter of the outer needle tube 2. A cooling channel 301 communicating with the inside of the capillary inner tube 3 is formed between the outer needle tube 2 and the capillary inner tube 3. Specifically, there is a fluid channel between the outer needle tube 2 and the capillary inner tube 3, and an inner tube channel is provided inside the capillary inner tube 3. The front end of the inner tube channel is connected to the fluid channel to form the cooling channel 301. A needle tip 4 is fixed at the upper end of the outer needle tube 2. The lower end of the outer needle tube 2 penetrates into the handle 1 and is electrically connected to a radiofrequency wire 7 for inputting radiofrequency current on the outer needle tube 2 of each main body of the electrode needle. A temperature measuring thermocouple 5 is installed at one end of the needle tip 4 close to the capillary inner tube 3 for monitoring the temperature in the area of the needle tip 4. An insulating layer is coated on the outside of each outer needle tube 2. One end of the insulating layer extends to the connection between the outer needle tube 2 and the handle 1, and the outer needle tube 2 between the other end of the insulating layer and the needle tip forms the working section of the outer needle tube 2. By integrally installing multiple main bodies of the electrode needle on the same handle 1, the working sections of the outer needle tubes 2 of each main body of the electrode needle work together to produce a clustering effect, thereby effectively increasing the treatment range of a single ablation electrode, and medical staff only need to operate on a single handle 1. Independent cooling channels 301 and temperature measuring thermocouples 5 are provided inside each main body of the electrode needle, and the temperatures of the working sections of the outer needle tubes 2 can be synchronously monitored, and the heat in the tissue near the working section can be taken away in time to achieve effective temperature control, thereby avoiding carbonization of the tissue in the treatment area and maintaining the low impedance of the tissue.
[0023] As Figure 2 and Figure 4 As shown in the figure, a cold circulation part is fixed inside the handle 1. A water supply pipe 8 and a water return pipe 9 are connected to the cold circulation part. The lower ends of the outer needle tubes 2 are connected to the water supply pipe 8 through the cold circulation part, and the parts of the lower ends of the capillary inner tubes 3 extending out of the outer needle tubes 2 are connected to the water return pipe 9 through the cold circulation part. Further preferably, the cold circulation part is a circulation tank 6. The circulation tank 6 is divided into a water supply chamber 601 and a water return chamber 602 by a partition plate 603 along the direction away from the main body of the electrode needle. A water inlet seat 604 for connecting the water supply pipe 8 is formed on the partition plate 603. An outlet seat 605 for connecting the water return pipe 9 is formed on one side of the circulation tank 6 away from the main body of the electrode needle. Each outer needle tube 2 penetrates through the cold circulation tank 6 and communicates with the water supply chamber 601. Each capillary inner tube 3 penetrates through the partition plate 603 and communicates with the water return chamber 602. The wire end of the temperature measuring thermocouple 5 enters the water return chamber 602 along the capillary inner tube 3 and then passes through the circulation tank 6. The wires of each temperature measuring thermocouple 5 passing through the circulation tank 6 are integrated with the radiofrequency wire 7 in the same cable and pass through the handle 1 to be connected to an electrode connector.
[0024] For the convenience of installing the circulation tank 6, a plurality of annular protrusions 606 are formed on the outer side of the circulation tank 6, and an annular installation groove 101 that cooperates with the annular protrusions 606 is formed on the inner side of the handle 1.
[0025] As Figure 3 shown, the needle tip 4 includes a pointed head portion 401 and a connecting portion 402. The pointed head portion 401 is located outside the outer needle tube 2 and is in a pyramid shape. The connecting portion 402 is fitted and installed inside the outer needle tube 2, and an embedded groove 403 for fixing the temperature-measuring thermocouple 5 is formed on the connecting portion 402. By embedding and installing the temperature-measuring end of the temperature-measuring thermocouple 5 in the embedded groove 403 and performing welding and sealing, the temperature-measuring thermocouple 5 is isolated from the circulating water in the cooling channel 301, thereby avoiding the influence of the circulating water on its temperature-measuring accuracy.
[0026] As Figure 4 shown, a conductive frame 11 is provided at the connection position between the outer needle tube 2 and the radio frequency wire 7. The inner side of the conductive frame 11 is welded to each of the outer needle tubes 2, and the outer side of the conductive frame 11 is welded to the radio frequency wire 7. The above welding method is preferably soldering to ensure the conductive effect. By adding the conductive frame 11, compared with single wire connection, the stability of the electrical connection between the outer needle tubes 2 can be effectively improved.
[0027] As Figure 2 and Figure 4 shown, in order to further improve the stability between the plurality of outer needle tubes 2 and avoid the influence of the operation shaking of the outer needle tubes 2 outside the handle 1 on the electrical welding inside the outer needle tubes 2. A support plate 10 is fixed at the position between the top of the handle 1 and the circulation tank 6. A through hole for each outer needle tube 2 to pass through is formed on the support plate 10, realizing the three-point fixation of the support plate 10, the top of the handle 1, and the circulation tank 6 on the outer needle tubes 2 inside the handle 1.
[0028] In order to facilitate the effective identification of the working state of the ablation electrode, the ablation electrode further includes an indicator light 13 and an annular magnet 12. The indicator light 13 is disposed through the handle 1. The annular magnet 12 is disposed outside the triangular area formed by the outer needle tubes 2 and is embedded and installed on the support plate 10. A magnetic induction coil 14 electrically connected to the indicator light 13 is wound around the annular magnet 12. When a radio frequency current is applied to the outer needle tube 2, a magnetic field is generated around the triangular area formed by the outer needle tubes 2, thereby changing the magnetic flux passing through the magnetic induction coil 14 and generating an induced current, and the indicator light 13 lights up, indicating that the ablation electrode is in a working state.
[0029] When implementing this technical solution, an outer needle tube 2 with a diameter of 1.5 mm is selected, the center distance between adjacent outer needle tubes 2 is set to 5 mm, the electrode connector is connected to the radiofrequency host, and the water supply pipe 8 and the water return pipe 9 are connected to an external cold source. When performing radiofrequency work, when the working section of the outer needle tube 2 is 2.5 cm, the diameter of the spherical ablation area formed by it is 4.2 - 4.5 cm. Under the same conditions, the ablation area formed by the existing single-needle ablation electrode is 2.6 - 3.0 cm; when the working section of the outer needle tube 2 is 3 cm, the diameter of the spherical ablation area formed by it is 5.2 - 5.5 cm. Under the same conditions, the ablation area formed by the existing single-needle ablation electrode is 3.1 - 3.7 cm; under the cluster effect of this radiofrequency ablation electrode, the diameter of the formed ablation area is enlarged by 1.5 times. At the same time, the cooling channels 301 and temperature-measuring thermocouples 5 separately arranged in each electrode needle body ensure the precise temperature control of the multi-electrode needle body and improve the treatment effect.
[0030] The above is only the specific implementation manner of this application, but the protection scope of this application is not limited thereto. Any person skilled in the art within the technical scope disclosed in this application can easily think of various equivalent modifications or substitutions, and these modifications or substitutions should all be covered within the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.
Claims
1. A clustered radiofrequency ablation electrode, comprising a handle and an electrode needle body, characterized in that: There are at least two electrode needle bodies, which are arranged in parallel on the top of the handle. Each electrode needle body includes an outer needle tube and a capillary inner tube penetrating the inner side of the outer needle tube. A cooling channel connected to the inside of the capillary inner tube is formed between the outer needle tube and the capillary inner tube. A needle tip is fixed to the upper end of the outer needle tube. The lower end of the outer needle tube penetrates the handle and is electrically connected to the radio frequency wire for inputting radio frequency current into the outer needle tube of each electrode needle body. A temperature measuring couple is installed at one end of the needle tip close to the capillary inner tube for monitoring the temperature of the working section of the outer needle tube.
2. The clustered radiofrequency ablation electrode according to claim 1, characterized in that: There are three electrode needle bodies, which are distributed on the top of the handle in an equilateral triangle, and the center distance between the outer needle tubes of adjacent electrode needle bodies is 3-3.5 times the outer diameter of the outer needle tubes.
3. The clustered radiofrequency ablation electrode according to claim 1 or 2, characterized in that: The outer side of each outer needle tube is coated with an insulating layer, one end of the insulating layer extends to the connection between the outer needle tube and the handle, and the outer needle tube between the other end of the insulating layer and the needle tip forms a working section of the outer needle tube.
4. The clustered radiofrequency ablation electrode according to claim 3, characterized in that: A cold circulation component is fixed inside the handle, and a water supply pipe and a water return pipe are connected to the cold circulation component. The lower end of each outer needle tube is connected to the water supply pipe via the cold circulation component, and the part of the lower end of each capillary inner tube extending out of the outer needle tube is connected to the water return pipe via the cold circulation component.
5. The clustered radiofrequency ablation electrode according to claim 4, characterized in that: The cold circulation component is a circulation tank, which is divided into an upper water chamber and a return water chamber through an isolation plate in a direction away from the electrode needle body. A water inlet seat for connecting to an upper water pipe is formed on the isolation plate, and a water outlet seat for connecting to a return water pipe is formed on the side of the circulation tank away from the electrode needle body. Each of the outer needle tubes passes through the cold circulation tank and is connected to the upper water chamber, and each of the capillary inner tubes passes through the isolation plate and is connected to the return water chamber. The wire end of the temperature measuring thermocouple enters the return water chamber along the capillary inner tube and then passes through the circulation tank.
6. The clustered radiofrequency ablation electrode according to claim 1 or 2, characterized in that: The needle tip includes a pointed portion and a connecting portion, wherein the pointed portion is located outside the outer needle tube and is pyramid-shaped, and the connecting portion is installed on the inner side of the outer needle tube. An embedded groove for fixing the temperature measuring couple is provided on the connecting portion.
7. The clustered radiofrequency ablation electrode according to claim 1 or 2, characterized in that: A conductive frame is provided at the connection position between the outer needle tube and the radio frequency wire, the inner side of the conductive frame is welded to each of the outer needle tubes, and the outer side of the conductive frame is welded to the radio frequency wire.
8. The clustered radiofrequency ablation electrode according to claim 5, characterized in that: A support plate is fixed at a position between the top of the handle and the circulation tank, and a through hole for each outer needle tube to pass through is opened on the support plate.
9. The clustered radiofrequency ablation electrode according to claim 5, characterized in that: A plurality of annular protrusions are formed on the outer side of the circulation tank, and an annular mounting groove matched with the annular protrusions is formed on the inner side of the handle.
10. The clustered radiofrequency ablation electrode according to claim 8, characterized in that: It includes an indicator light and an annular magnet. The indicator light is arranged on the handle, the annular magnet is arranged outside the area formed by the outer needle tubes and is embedded on the support plate, and a magnetic induction coil electrically connected to the indicator light is wound around the annular magnet.