A bipolar adjustable radio frequency ablation electrode and radio frequency ablation device

Abstract

The application relates to the field of medical devices, and discloses a bipolar adjustable radio frequency ablation electrode and a radio frequency ablation device, which comprise a handle, a needle tube and a needle head, the needle tube is arranged on the handle, the needle head is arranged on the needle tube, a first wire for connecting the needle head and a radio frequency host is arranged in the needle tube, at least one second ablation electrode is arranged on the outer side wall of the needle tube, a second wire electrically connected with the radio frequency host is arranged on the second ablation electrode, and an adjusting assembly for adjusting the relative position between the needle tube and the needle head in the axial direction of the needle tube is arranged on the handle. The application has the advantages that the relative position between the second ablation electrode and the needle head can be adjusted through the adjusting assembly, the action range of the radio frequency ablation electrode needle is adjusted, the second ablation electrode cooperates with the needle head to kill tumors, all tumors can be killed through single operation of the radio frequency ablation electrode needle, and the effect that it is not easy to operate and time-consuming and laborious for the radio frequency ablation electrode needle to kill larger tumors is improved.

Description

Technical Field

[0001] This application relates to the field of medical devices, and in particular to a bipolar adjustable radiofrequency ablation electrode and a radiofrequency ablation device. Background Technology

[0002] Radiofrequency ablation (RFA) for tumors utilizes imaging equipment such as CT or ultrasound for guidance. One or more thin needles are inserted into the tumor, heating the lesion. Because tumor cells are less heat-resistant than normal cells, the RFA kills these cells, causing tumor tissue necrosis and absorption, thus eliminating the tumor or reducing its burden. The main principle of this technique is that the electrodes of the RFA needle emit medium-to-high frequency radiofrequency waves, stimulating tissue cells to undergo plasma oscillation. The collision of these ions generates heat, reaching temperatures of 80-100°C, which effectively and rapidly kills local tumor cells. Simultaneously, it coagulates the surrounding tissue, forming a reaction zone that prevents further blood supply to the tumor and helps prevent metastasis.

[0003] Currently, existing radiofrequency ablation electrode needles include a needle tube, a needle tip, and a handle. The needle tube is mounted on the handle, and the needle tip is mounted on the end of the needle tube away from the handle. A wire is installed inside the needle tube. One end of the wire is electrically connected to the needle tip, and the other end is electrically connected to the radiofrequency host. When killing a tumor, the needle tip is inserted into the tumor, and the radiofrequency host provides medium- to high-frequency alternating current to the needle tip through the wire, so that the needle tip emits medium- to high-frequency radiofrequency waves, thereby killing the tumor.

[0004] Regarding the aforementioned technologies, tumors vary in size, and the radiofrequency waves emitted by the radiofrequency ablation electrode needle have a limited range of action. When the diameter of the tumor is larger than the range of action of the radiofrequency waves emitted by the radiofrequency ablation electrode needle, the radiofrequency ablation electrode needle can only kill part of the tumor each time, and multiple operations are required to kill the entire tumor. The inventors believe that there are drawbacks in that radiofrequency ablation electrodes are not easy to operate and are time-consuming and laborious in killing larger tumors. Summary of the Invention

[0005] To address the issues of the difficulty and time-consuming nature of radiofrequency ablation electrodes for killing larger tumors, this application provides a bipolar adjustable radiofrequency ablation electrode and a radiofrequency ablation device.

[0006] This application provides a bipolar adjustable radiofrequency ablation electrode, which adopts the following technical solution: A bipolar adjustable radiofrequency ablation electrode includes a handle, a needle tube, and a needle tip. The needle tube is disposed on the handle, and the needle tip is disposed at the end of the needle tube away from the handle. A first wire for connecting the needle tip (3) and the radiofrequency host is disposed inside the needle tube. At least one second ablation electrode is disposed on the outer wall of the needle tube, and a second wire electrically connected to the radiofrequency host is disposed on the second ablation electrode. An adjustment component for adjusting the relative position between the needle tube and the needle tip along the needle tube axis is disposed on the handle.

[0007] By adopting the above technical solution, when ablating a tumor, the operator holds the handle and inserts the needle into the tumor. The first lead provides current to the needle, forming a first ablation electrode at the needle tip, and the second lead provides current to the second ablation electrode on the needle tube. The first and second ablation electrodes work together to ablate the tumor, thereby increasing the effective range of the radiofrequency ablation electrode needle. Before ablating the tumor, the tumor size is measured using CT or ultrasound. Based on the size of the tumor, the adjustment component is used to adjust the needle tube or needle, thereby adjusting the relative position between the second ablation electrode and the needle tip. This ensures that the effective range of the first and second ablation electrodes covers the entire tumor, allowing the radiofrequency ablation electrode needle to ablate the entire tumor in a single operation. This setup, by using the second ablation electrode in conjunction with the first ablation electrode to increase the tumor ablation range, and by adjusting the relative position between the second ablation electrode and the needle tip, adjusts the effective range of the radiofrequency ablation electrode needle, enabling the radiofrequency ablation electrode needle to ablate the entire tumor in a single operation, makes the overall operation more convenient, faster, and saves time and effort.

[0008] Preferably, the adjustment assembly includes a rotating block, a connecting rod, and a movable block. The rotating block is rotatably mounted on the handle. The connecting rod is fixedly connected to the rotating block and located inside the handle. A sliding strip hole is formed inside the connecting rod along the needle tube axis. A through hole communicating with the sliding strip hole is formed at one end of the connecting rod near the needle tip. The movable block is slidably sleeved on the connecting rod, and the outer side wall of the movable block is threadedly engaged with the inner side wall of the handle. A limit block is provided inside the movable block. The limit block is slidably mounted in the sliding strip hole along the needle tube axis. A fixed rod is fixedly mounted inside the handle. The end of the fixed rod extends outside the handle and is fixedly connected to the needle tip. The limit block is slidably mounted on the fixed rod. The needle tube extends through the through hole into the handle and is fixedly connected to the limit block. The needle tube is slidably sleeved on the fixed rod. The first lead wire is disposed inside the fixed rod.

[0009] By adopting the above technical solution, when adjusting the needle tip, rotating the rotating block causes the connecting rod to rotate within the handle. During this rotation, the connecting rod drives the limiting block within the sliding strip hole to rotate. The limiting block's rotation then drives the moving block to rotate. The moving block engages with the threaded inner wall of the handle during rotation, causing it to move along the needle tube axis. This movement of the moving block also moves the limiting block within the sliding strip hole, which in turn moves the needle tube within the through hole. The fixed rod remains stationary, keeping the needle tip position unchanged, thus adjusting the combined working range of the first and second ablation electrodes. With this configuration, the needle tube position can be quickly adjusted by rotating the rotating block.

[0010] Preferably, the fixing rod is hollow, and a cooling component for reducing the temperature of the needle and the second ablation electrode is provided inside the cavity of the fixing rod. The cooling component includes an inlet pipe and an outlet pipe. The inlet pipe is located on the inner side wall of the fixing rod and abuts against the needle. The outlet pipe is located inside the fixing rod and is connected to the inlet pipe.

[0011] By adopting the above technical solution, when the radiofrequency ablation electrode targets and kills tumors, the cooling component cools the needle and the second ablation electrode. Coolant enters the inlet pipe; when the coolant flows near the second ablation electrode, it absorbs heat from the electrode; when it flows near the needle, it absorbs heat from the needle. After absorbing heat from both the needle and the ablation electrode, the coolant flows out through the outlet pipe. This configuration, by using the cooling component to cool the needle and the second ablation electrode, makes the radiofrequency ablation electrode needle more stable during operation.

[0012] Preferably, the water inlet pipe is threaded and fits onto the inner wall of the fixing rod.

[0013] By adopting the above technical solution, the threaded water inlet pipe increases the contact area between the water inlet pipe and the inner wall of the fixing rod, thereby improving the heat absorption effect of the coolant.

[0014] Preferably, the second ablation electrode is configured as an annular shape and disposed on the outer wall of the needle tube.

[0015] By adopting the above technical solution, the annular second ablation electrode allows the radiofrequency waves emitted by the second ablation electrode to have a wider range, thereby making the second ablation electrode more effective in killing tumors.

[0016] Preferably, the second lead wire is disposed along the outer wall of the needle tube, or passes through the handle and is electrically connected to the first lead wire.

[0017] By adopting the above technical solution, when the second wire passes through the handle and is electrically connected to the first wire, the first wire provides current to the second wire. At this time, the current at both the first and second ablation electrodes is provided by the first wire, so the effective range of the first and second ablation electrodes is the same. When the second wire is not electrically connected to the first wire, the first and second wires are respectively connected to two radio frequency hosts. At this time, the current at the first and second ablation electrodes can be adjusted separately by the two radio frequency hosts, so that the effective range of the first and second ablation electrodes is different, thus making it suitable for tumors of different sizes.

[0018] Preferably, the second ablation electrodes are spaced in multiples, and the second wire is configured as one and connected in series with multiple second ablation electrodes, or the second wire is configured as multiple wires and is configured to correspond one-to-one with multiple second ablation electrodes, and the multiple second wires are electrically connected to different second ablation electrodes and radio frequency host respectively.

[0019] By adopting the above technical solution, when multiple second ablation electrodes are used to kill tumors and a second lead is used, the second lead provides the same power to multiple second ablation electrodes simultaneously, thereby making the effective range of multiple second ablation electrodes the same and increasing the tumor-killing effect of multiple second ablation electrodes. When multiple second ablation electrodes are used to kill tumors and multiple second leads are used, the multiple second leads are respectively connected to multiple radiofrequency hosts, and the multiple second leads correspond one-to-one with multiple second ablation electrodes and are electrically connected. At this time, the current magnitude at multiple second ablation electrodes can be adjusted individually by multiple radiofrequency hosts, so that the effective range of multiple second ablation electrodes is different, thus making it suitable for tumors of different sizes.

[0020] Preferably, the second ablation electrode is a metal conductive layer formed by electroplating, and the second wire is a metal wire formed by electroplating.

[0021] By adopting the above technical solution, the second ablation electrode and the second lead wire formed by electroplating are extremely thin, so that when the staff holds the handle and inserts the needle into the tumor, the second ablation electrode and the second lead wire formed by electroplating are less likely to scrape against human tissue and tumor tissue, thus making it easier to insert the needle into the tumor.

[0022] This application provides a radiofrequency ablation device, which adopts the following technical solution: A radiofrequency ablation device includes a radiofrequency host and a bipolar adjustable radiofrequency ablation electrode, wherein the first and second leads of the bipolar adjustable radiofrequency ablation electrode are both electrically connected to the radiofrequency host.

[0023] By adopting the above technical solution, the radiofrequency host provides power to the dual-level adjustable radiofrequency ablation electrode through the first and second wires, thereby enabling the radiofrequency ablation electrode to target and kill tumors.

[0024] In summary, this application includes at least one of the following beneficial technical effects: 1. By adopting a second ablation electrode and an adjustment component, the second ablation electrode, in conjunction with the first ablation electrode, increases the range of tumor killing targeted by the radiofrequency ablation electrode. At the same time, the adjustment component can adjust the relative position between the second ablation electrode and the needle, thereby adjusting the effective range of the radiofrequency ablation electrode needle. This allows the radiofrequency ablation electrode needle to kill all tumors in a single operation, making the overall operation more convenient, faster, and more time-saving and labor-saving. 2. By employing a cooling component, the needle tip and the second ablation electrode are cooled, thereby making the radiofrequency ablation electrode needle more stable during operation; 3. By using a threaded water inlet pipe, the contact area between the water inlet pipe and the inner wall of the fixing rod is increased, thereby improving the cooling effect of the cooling component. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the bipolar adjustable radiofrequency ablation electrode in Embodiment 1 of this application; Figure 2 This is a partial structural cross-sectional view of the adjustment component in Embodiment 1 of this application, used to highlight the component. Figure 3 This is a cross-sectional view of the handle in Embodiment 1 of this application; Figure 4 This application Figure 3 A magnified diagram is shown in section A. Figure 5 This is an exploded view of part of the structure of the adjustment component in Embodiment 1 of this application to highlight its features; Figure 6 This is a partial structural cross-sectional view of the cooling component in Embodiment 1 of this application, used to highlight its structure. Figure 7 This is a schematic diagram of the overall structure of the bipolar adjustable radiofrequency ablation electrode in Embodiment 2 of this application.

[0026] Explanation of reference numerals in the attached drawings: 1. Handle; 2. Needle tube; 3. Needle tip; 4. First lead wire; 5. Second ablation electrode; 6. Adjustment component; 61. Rotating block; 62. Connecting rod; 63. Moving block; 7. Fixing rod; 8. Sliding strip hole; 9. Through hole; 10. Limiting block; 11. Cooling component; 111. Water inlet pipe; 112. Water outlet pipe; 12. Connecting lead wire; 13. Second lead wire; 14. Fixing block. Detailed Implementation

[0027] The following is in conjunction with the appendix Figure 1-7 This application will be described in further detail.

[0028] Example 1: This application discloses a bipolar adjustable radiofrequency ablation electrode.

[0029] Reference Figure 1 and 2 A bipolar adjustable radiofrequency ablation electrode includes a handle 1, a needle tube 2, and a needle tip 3. The needle tube 2 is installed at the middle of one end of the handle 1 and is coaxially arranged with the handle 1. A fixing block 14 is fixedly installed on the inner side wall of the handle 1 away from the needle tube 2. A fixing rod 7 is fixedly installed at the end of the fixing block 14. The fixing rod 7 passes through the needle tube 2 and extends to the outside of the needle tube 2. The needle tip 3 is fixedly installed at the end of the fixing rod 7 away from the handle 1. The fixing rod 7 is hollow, and a first wire 4 is installed in the cavity of the fixing rod 7. One end of the first wire 4 is electrically connected to the needle tip 3, and the other end of the first wire 4 passes through the fixing rod 7 and the handle 1 and is electrically connected to an external radiofrequency host. In this application, the needle tube 2 can be an insulated needle tube 2 made of PE material that is harmless to the human body, and the fixing rod 7 can be an insulated fixing rod 7 made of PE material that is harmless to the human body. When killing a tumor, the staff holds the handle 1 and inserts the needle 3 into the tumor tissue. The radiofrequency host provides medium- and high-frequency alternating current to the needle 3 through the first wire 4, so that the needle 3 forms a first ablation electrode. The first ablation electrode emits medium- and high-frequency radiofrequency waves, thereby killing the tumor.

[0030] Reference Figure 1 A ring-shaped second ablation electrode 5 is installed on the outer wall of the needle tube 2 near the needle tip 3. A second lead wire 13 is installed on the outer wall of the needle tube 2 along its own axis. One end of the second lead wire 13 is electrically connected to the second ablation electrode 5, and the other end of the second lead wire 13 is electrically connected to the first lead wire 4. An adjustment component 6 is installed inside the handle 1, and the adjustment component 6 adjusts the position of the needle tube 2 along the axis of the fixing rod 7. When killing the tumor, the first lead wire 4 provides current to the second ablation electrode 5 through the second lead wire 13. The first ablation electrode and the second ablation electrode 5 work together to kill the tumor, thereby increasing the effective range of the radiofrequency ablation electrode needle. According to the size of the tumor, the position of the needle tube 2 is adjusted using the adjustment component 6, thereby adjusting the effective range of the radiofrequency ablation electrode needle, so that the radiofrequency ablation electrode needle can kill the entire tumor in a single operation, making the overall operation more convenient, faster, and saving time and effort.

[0031] Reference Figure 2 and 5The adjusting component 6 includes a rotating block 61, a connecting rod 62, and a moving block 63. The rotating block 61 is coaxially rotatably mounted on the end of the handle 1 near the needle 3. The connecting rod 62 is coaxially rotatably mounted inside the handle 1 and is fixedly connected to the rotating block 61. The connecting rod 62 is hollow inside and has openings at both ends along its own axis. Sliding strip holes 8 are provided on both opposite side walls of the connecting rod 62 along its own diameter. The moving block 63 is slidably sleeved on the connecting rod 62 along its axis, and the outer side wall of the moving block 63 is threadedly engaged with the inner side wall of the handle 1. A limiting block 10 is fixedly installed inside the moving block 63, and the limiting block 10 is slidably mounted in the two sliding strip holes 8 in accordance with the moving direction of the moving block 63. Rotating the rotating block 61 causes the connecting rod 62 to rotate, which in turn causes the sliding strip hole 8 to rotate. The sliding strip hole 8, through the limiting block 10, causes the moving block 63 to rotate. During the rotation, the moving block 63 engages with the inner wall of the handle 1, thereby causing the moving block 63 to move along the axis of the connecting rod 62.

[0032] Reference Figure 4 and 5 A through hole 9 is formed in the middle of the rotating block 61 along the axis of the fixed rod 7. The fixed rod 7 is located inside the through hole 9. The needle tube 2 is slidably sleeved on the fixed rod 7 and passes through the through hole 9 and is fixedly connected to the limiting block 10. When the moving block 63 moves along the axis of the connecting rod 62, it drives the limiting block 10 to move within the two sliding strip holes 8. At the same time, the limiting block 10 moves on the fixed rod 7. As the limiting block 10 moves, it drives the needle tube 2 to move within the through hole 9, thereby driving the second ablation electrode 5 to move and adjusting the combined working range of the first ablation electrode and the second ablation electrode 5.

[0033] Reference Figure 3 and 4One end of the second lead wire 13 is electrically connected to the second ablation electrode 5, and the other end of the second lead wire 13 extends into the handle 1 and abuts against the limiting block 10. A connecting lead wire 12 is installed inside the limiting block 10. One end of the connecting lead wire 12 is electrically connected to the point where the second lead wire 13 abuts against the limiting block 10, and the other end of the connecting lead wire 12 is electrically connected to the first lead wire 4. The radiofrequency host provides current to the connecting lead wire 12 through the first lead wire 4, and the connecting lead wire 12 provides current to the second lead wire 13. The second lead wire 13 transmits the current to the second ablation electrode 5, thereby enabling the second ablation electrode 5 to kill the tumor. At this time, the current of both the first and second ablation electrodes is provided by the first lead wire, so the effective range of the first and second ablation electrodes 5 is the same. The connecting wire 12 may not be electrically connected to the first wire 4. In this case, the connecting wire 12 passes through the handle 1 and is directly electrically connected to the radio frequency host. The first wire 3 and the second wire 13 are respectively connected to the two radio frequency hosts. At this time, the current magnitude of the first ablation electrode and the second ablation electrode 5 can be adjusted separately by the two radio frequency hosts, so that the effective range of the first ablation electrode and the second ablation electrode 5 is different, thus making them suitable for tumors of different sizes.

[0034] Reference Figure 6 A cooling component 11 is installed inside the fixing rod 7. The cooling component 11 includes an inlet pipe 111 and an outlet pipe 112. One end of the inlet pipe 111 and the outlet pipe 112 are located inside the fixing rod 7 and are interconnected. The other end of the inlet pipe 111 and the outlet pipe 112 pass through the end of the handle 1 away from the needle 3 and are connected to an external water supply device. The portion of the inlet pipe 111 located inside the fixing rod 7 is threaded and fits against the inner side wall of the fixing rod 7, and the end of the inlet pipe 111 abuts against the needle 3. When the radiofrequency ablation electrode targets and kills the tumor, the external water supply device injects coolant into the inlet pipe 111. When the coolant flows to the vicinity of the second ablation electrode 5, the coolant absorbs the heat of the second ablation electrode 5. When the coolant flows to the vicinity of the needle 3, it absorbs the heat of the needle 3. After absorbing the heat from the needle 3 and the second ablation electrode 5, the coolant flows back to the water supply device through the outlet pipe 112. By using the cooling component 11 to cool the needle 3 and the second ablation electrode 5, the radiofrequency ablation electrode needle becomes more stable during operation. Furthermore, the threaded shape of the water inlet pipe 111 increases the contact area between the water inlet pipe 111 and the fixing rod 7, thereby increasing the cooling effect of the cooling component 11.

[0035] The implementation principle of Embodiment 1 of this application is as follows: When killing a tumor, the size of the tumor is first measured by CT, ultrasound, etc. According to the size of the tumor, the position of the needle tube 2 is adjusted by the adjustment component 6. The rotating block 61 is rotated, which drives the connecting rod 62 to rotate. The connecting rod 62 drives the sliding strip hole 8 to rotate. The sliding strip hole 8 drives the moving block 63 to rotate through the limiting block 10. During the rotation, the moving block 63 is screwed into the inner wall of the handle 1, so that the moving block 63 moves along the axis of the connecting rod 62. The moving block 63 drives the needle tube 2 to move through the limiting block 10, thereby adjusting the position of the second ablation electrode 5. After adjustment, the needle 3 is inserted into the tumor tissue. The radio frequency host provides medium- and high-frequency alternating current to the needle 3 through the first wire 4, so that the first ablation electrode is formed at the needle 3. The first wire 4 provides medium- and high-frequency alternating current to the second ablation electrode 5 through the connecting wire 12 and the second wire 13. The first ablation electrode and the second ablation electrode 5 together emit medium- and high-frequency radio frequency waves, thereby killing the tumor. The first ablation electrode and the second ablation electrode 5 work together to kill the tumor, thereby increasing the effective range of the radiofrequency ablation electrode needle. The position of the needle tube 2 is adjusted according to the size of the tumor using the adjustment component 6, thereby adjusting the effective range of the radiofrequency ablation electrode needle. This allows the radiofrequency ablation electrode needle to kill the entire tumor in a single operation, making the overall operation more convenient, faster, and more time-saving.

[0036] Example 2: Reference Figure 7 The difference between this embodiment and Embodiment 1 is that three second ablation electrodes 5 are installed, and the three second ablation electrodes 5 are installed at equal intervals on the outer wall of the needle tube 2 near the end of the needle tip 3. The second lead wire 13 is connected in series with the three second ablation electrodes 5 and electrically connected to them. When killing the tumor, the three second ablation electrodes 5 work together to kill the tumor, and the second lead wire 13 provides the same power to the three second ablation electrodes 5, so that the three second ablation electrodes 5 emit radio frequency waves of the same frequency, increasing the tumor-killing effect of the three second ablation electrodes 5. The second lead wire 13 can also be installed with three wires. In this case, the three second lead wires 13 correspond one-to-one with the three second ablation electrodes 5 and are electrically connected individually. The other end of each of the three second lead wires 13 is individually electrically connected to a radio frequency host. In this case, the current of the multiple second ablation electrodes 5 can be adjusted individually by multiple radio frequency hosts, so that the effective range of the multiple second ablation electrodes 5 is different, thus making them suitable for tumors of different sizes.

[0037] There are three possible ranges of action for the first ablation electrode and the second ablation electrode 5: When the first lead 4 and the second lead 13 are electrically connected, and there is one or three second lead 13 wires, the ranges of action for the three second ablation electrodes 5 are the same as those for the first ablation electrode; when the first lead 4 and the second lead 13 are not connected, and there is only one second lead 13 wire, the ranges of action for the three second ablation electrodes 5 are the same, but their ranges of action differ from those of the first ablation electrode; when the first lead 4 and the second lead 13 are not connected, and there are three second lead 13 wires, the ranges of action for the three second ablation electrodes 5 are different, and their ranges of action differ from those of the first ablation electrode. This allows the first ablation electrode and the three second ablation electrodes 5 to have multiple different ranges of action, making the radiofrequency ablation electrode needle suitable for tumors of different sizes.

[0038] The second ablation electrode 5 is an annular conductive metal layer electroplated on the outer wall of the needle tube 2. The second wire 13 is connected to the second ablation electrode 5. The second wire 13 is also a metal wire electroplated on the outer wall of the needle tube 2, and it is electrically connected to the annular conductive metal layer. The electroplated second ablation electrode 5 and the second wire 13 are extremely thin, making it less likely for the operator to scrape against human tissue and tumor tissue when inserting the needle 3 into the tumor by holding the handle 1, thus facilitating the insertion of the needle 3 into the tumor.

[0039] The implementation principle of Embodiment 2 of this application is as follows: When killing a tumor, the first ablation electrode and the three second ablation electrodes 5 have multiple different ranges of action through various connection situations between the first wire 4 and the second wire 13, so that the radiofrequency ablation electrode needle is suitable for tumors of different sizes.

[0040] Example 3: This application discloses a radiofrequency ablation device.

[0041] Reference Figure 1 and 7 A radiofrequency ablation device includes a radiofrequency host and a bipolar adjustable radiofrequency ablation electrode. The first lead 4 and the second lead 13 of the bipolar adjustable radiofrequency ablation electrode are both electrically connected to the radiofrequency host. The radiofrequency host provides power to the bipolar adjustable radiofrequency ablation electrode through the first lead 4 and the second lead 13, thereby enabling the radiofrequency ablation electrode to target and kill tumors.

[0042] The implementation principle of Embodiment 3 of this application is as follows: the radio frequency host provides power to the dual-level adjustable radio frequency ablation electrode through the first wire 4 and the second wire 13, thereby enabling the radio frequency ablation electrode to kill the tumor.

[0043] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A bipolar adjustable radiofrequency ablation electrode, comprising a handle (1), a needle tube (2), and a needle tip (3), wherein the needle tube (2) is disposed on the handle (1), and the needle tip (3) is disposed at the end of the needle tube (2) away from the handle (1), and a first wire (4) for connecting the needle tip (3) and the radiofrequency host is disposed inside the needle tube (2), characterized in that: At least one second ablation electrode (5) is provided on the outer wall of the needle tube (2), and a second wire (13) connected to the second ablation electrode (5) is provided to be electrically connected to the radio frequency host. An adjustment component (6) is provided on the handle (1) for adjusting the relative position between the needle tube (2) and the needle tip (3) along the axial direction of the needle tube (2). One end of the first wire (4) is electrically connected to the needle (3), and the other end of the first wire (4) passes through the handle (1) and is electrically connected to the external radio frequency host. The radio frequency host provides medium- and high-frequency AC power to the needle (3) through the first wire (4), so that a first ablation electrode is formed at the needle (3), and the first ablation electrode emits medium- and high-frequency radio frequency waves. The adjustment assembly (6) includes a rotating block (61), a connecting rod (62), and a moving block (63). The rotating block (61) is rotatably mounted on the handle (1). The connecting rod (62) is fixedly connected to the rotating block (61) and located inside the handle (1). A sliding strip hole (8) is provided inside the connecting rod (62) along the axis of the needle tube (2). A through hole (9) is provided inside the rotating block (61). The moving block (63) is slidably mounted on the connecting rod (62), and the outer wall of the moving block (63) is threadedly engaged with the inner wall of the handle (1). The moving block (63) has a sliding strip hole (8) inside the connecting rod (62) along the axis of the needle tube (2). A limiting block (10) is provided, which is slidably disposed in the sliding strip hole (8) along the axis of the needle tube (2). A fixing rod (7) is fixedly disposed in the handle (1). The end of the fixing rod (7) extends to the outside of the handle (1) and is fixedly connected to the needle (3). The limiting block (10) is slidably disposed on the fixing rod (7). The needle tube (2) extends through the through hole (9) into the handle (1) and is fixedly connected to the limiting block (10). The needle tube (2) is slidably sleeved on the fixing rod (7). The first wire (4) is disposed in the fixing rod (7). The second ablation electrode (5) is arranged in a ring shape and disposed on the outer wall of the needle tube (2); the second wire (13) is disposed along the outer wall of the needle tube (2) or passes through the handle (1) and is electrically connected to the first wire (4); The second ablation electrode (5) is provided at intervals. The second wire (13) is configured as one and connected in series with multiple second ablation electrodes (5), or the second wire (13) is configured as multiple wires and is provided in one-to-one correspondence with multiple second ablation electrodes (5). The multiple second wires (13) are electrically connected to different second ablation electrodes (5) and radio frequency host respectively.

2. The bipolar adjustable radiofrequency ablation electrode according to claim 1, characterized in that: The fixing rod (7) is hollow, and a cooling component (11) for reducing the temperature of the needle (3) and the second ablation electrode (5) is provided in the cavity of the fixing rod (7). The cooling component (11) includes an inlet pipe (111) and an outlet pipe (112). The inlet pipe (111) is located on the inner side wall of the fixing rod (7) and abuts against the needle (3). The outlet pipe (112) is located inside the fixing rod (7) and is connected to the inlet pipe (111).

3. The bipolar adjustable radiofrequency ablation electrode according to claim 2, characterized in that: The water inlet pipe (111) is threaded and attached to the inner wall of the fixing rod (7).

4. The bipolar adjustable radiofrequency ablation electrode according to claim 1, characterized in that: The second ablation electrode (5) is a metal conductive layer formed by electroplating, and the second wire (13) is a metal wire formed by electroplating.

5. A radiofrequency ablation device, characterized in that: Includes a radio frequency host and a bipolar adjustable radio frequency ablation electrode as described in any one of claims 1 to 4, wherein the first wire (4) and the second wire (13) of the bipolar adjustable radio frequency ablation electrode are both electrically connected to the radio frequency host.

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