Multi-electrode radiofrequency ablation needle and control method thereof

Abstract

The present invention discloses a multi-electrode radiofrequency ablation needle and a control method thereof, including a handle assembly, an ablation catheter and an electrode assembly. The ablation catheter is provided with a saline catheter connected to an ablation host and a water outlet is provided on the ablation catheter. The electrode assembly includes multiple groups of electrode groups and multiple thermocouples arranged along the length direction of the ablation catheter. The handle assembly is provided with a preset structure for presetting the length ratio of the electrode needles contained in each electrode group extending out of the ablation catheter and a linkage structure for driving the coordinated movement of each electrode group. The above technical scheme uses the preset structure in the handle assembly to preset the length ratio of each electrode needle extending out of the ablation catheter, thereby adjusting and presetting the ablation parameters. During the ablation operation, the linkage structure is used to adjust the position of each electrode group, and finally ablation of different positions of the lesion with different ablation parameters is achieved at the same time, which can effectively improve the efficiency of the ablation operation and reduce the risk of the operation.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and more specifically, to a multi-electrode radiofrequency ablation needle and a control method thereof. Background Art

[0002] Radiofrequency ablation technology mainly relies on radiofrequency therapeutic devices with ablation function, and the treatment mechanism is mainly thermal effect. When radiofrequency current flows through human tissue, the rapid change of electromagnetic field causes polar water molecules in the tissue to move at high speed, generating heat (i.e. endogenous thermal effect), causing the water inside and outside the cells to evaporate, dry, shrink and fall off, resulting in aseptic necrosis, thus achieving the purpose of treatment.

[0003] The radiofrequency ablation system generally includes a radiofrequency host, an ablation catheter, and a radiofrequency electrode. The radiofrequency host is used to generate and output radiofrequency current of a set frequency according to the user's settings; the ablation catheter is generally made of hard materials, and its interior is hollow, which is used to place components such as electrodes, thermocouples, and cooling water catheters, and also has a puncture function. The radiofrequency electrode is electrically connected to the radiofrequency host to excite high-frequency radiofrequency current at the lesion site to kill the lesion tissue cells.

[0004] Radiofrequency electrodes include monopolar and bipolar structures. Monopolar electrodes can only release energy at one conductive part, making it difficult to accurately control the ablation range, and can only ablate a small area of ​​tissue at a time; bipolar electrodes can transfer energy through the current path between the two conductive parts, and can ablate the target tissue more accurately. The cooling water catheter is used to inject saline into the lesion ablation site. On the one hand, it plays a role in cooling and controlling the temperature, and on the other hand, it can also increase the electrolytes in the ablation site to facilitate conduction between the positive and negative radiofrequency electrodes.

[0005] From the composition and working principle of the above-mentioned radiofrequency ablation system, it can be seen that the current radiofrequency ablation electrode can only ablate the lesion tissue cells with the same frequency of radiofrequency current at the same lesion site at the same time. However, the inventors found in practice that there are usually large differences in the biological tissue components in the inner core and outer edge of the lesion tissue, which means that if the same radiofrequency current is used to ablate the two, different thermal effects will be produced, or the degree of ablation of different tissues will be different under the action of radiofrequency current with the same parameters. It is precisely because of the above reasons that if the operation is performed at the edge of the lesion tissue during the ablation process, it is easy to cause heat spillover and damage the normal tissue cells around the lesion tissue; and if the surgeon adjusts the radiofrequency parameters during the ablation process, it is not only easy to cause misoperation, but also prolong the operation time and increase the risk of surgery. Summary of the invention

[0006] In view of the problem that in actual use, radiofrequency ablation electrodes can only ablate lesion tissue with the same radiofrequency parameters at the same time, resulting in low efficiency of ablation surgery, the first purpose of this application is to propose a multi-electrode radiofrequency ablation needle, which can configure the radiofrequency parameters and related auxiliary configurations corresponding to each electrode needle in advance according to the radiofrequency parameters required for each position of the lesion before the ablation surgery is performed, and the radiofrequency parameters of each electrode needle have the function of linkage adjustment, which is convenient to adjust during the operation, and can bring great help to solving the problems existing in the prior art. The second purpose of this application is to provide a multi-electrode radiofrequency ablation control method, which, combined with the aforementioned multi-electrode radiofrequency ablation needle, can significantly improve the efficiency of radiofrequency ablation surgery. The specific scheme is as follows:

[0007] A multi-electrode radiofrequency ablation needle comprises a handle assembly, an ablation catheter and an electrode assembly, wherein the ablation catheter is provided with a saline catheter connected to an ablation host and a water outlet is provided on the ablation catheter;

[0008] The electrode assembly includes a plurality of electrode groups arranged along the length direction of the ablation catheter, and thermocouples arranged one-to-one corresponding to the plurality of electrode groups;

[0009] The handle assembly is provided with a preset structure for presetting the ratio of the length of the electrode needles contained in each electrode group extending to the outside of the ablation catheter, and a linkage structure for driving the coordinated movement of each electrode group.

[0010] Through the above technical scheme, the preset structure in the handle assembly can be used to preset the length ratio of each electrode needle extending out of the ablation catheter, thereby adjusting and presetting the ablation parameters. During the ablation operation, the position of each electrode group can be adjusted by using the above linkage structure, and finally ablation of different positions of the lesion with different ablation parameters at the same time can be achieved, which can effectively improve the efficiency of the ablation operation and reduce the surgical risk.

[0011] Furthermore, the ablation catheter comprises an inner tube and an outer tube which are coaxially arranged, and a plurality of spacers are arranged between the outer wall of the inner tube and the inner wall of the outer tube to form a plurality of placement channels;

[0012] A plurality of electrode pinholes are provided on the side wall of one end of the outer tube away from the handle assembly for the electrode group to extend from the placement channel to the outside of the outer tube. The plurality of electrode pinholes are arranged in multiple circles along the length direction of the outer tube, and the positions of the electrode pinholes are respectively connected to different placement channels;

[0013] Each of the electrode groups includes a plurality of electrode needles. The plurality of electrode needles corresponding to the same electrode group are respectively arranged in the plurality of placement channels in a rotationally symmetrical manner with the outer tube axis as the center. The plurality of electrode needles corresponding to different electrode groups are staggered in each placement channel. The ends of the plurality of electrode needles away from the handle assembly are spike-shaped and made of memory alloy.

[0014] When one end of the electrode needle contained in the electrode group is extended to the outside of the ablation catheter and unfolded, the electrode group as a whole is in an umbrella shape.

[0015] Through the above technical solution, different electrode groups pass through different positions of the end of the ablation catheter to the outside of the ablation catheter, so that a large area of ​​lesion tissue can be ablated at the same time. Moreover, since each electrode group can be preset with different extension lengths and electrical parameters, differentiated ablation plans can be provided for different lesion sites at the same time during the ablation operation, which helps to improve the efficiency of the ablation operation.

[0016] Furthermore, the handle assembly includes a gripping section, a connecting section and an adjusting section, the gripping section is L-shaped, the connecting section is coaxially fixedly connected to one end face of the gripping section, the adjusting section is cylindrical as a whole and is coaxially slidably sleeved on the connecting section, and a locking structure for adjusting and locking the relative positions of the adjusting section and the connecting section is provided between the adjusting section and the connecting section;

[0017] The gripping section, the connecting section and the adjusting section are provided with wiring channels and water supply channels for cables and cooling water pipes to pass through;

[0018] The wiring channel in the adjustment section is configured as a plurality of wiring sub-channels, all of which are close to the surface of the adjustment section and are evenly arranged along the circumference of the adjustment section. One end of each wiring sub-channel in the adjustment section is connected to the wiring channel in the holding section, and the other end corresponds to each placement channel in the ablation catheter one by one and is interconnected. Each thermocouple and a plurality of electrode needles contained in the electrode group are respectively inserted from the wiring channel in the holding section into each wiring sub-channel of the adjustment section, and then respectively inserted into each placement channel of the ablation catheter;

[0019] The wiring sub-channel is connected with the side wall surface of the adjustment section to form an adjustment slide groove arranged along the length direction of the adjustment section, and the preset structure includes an adjustment slider slidably arranged in the adjustment slide groove;

[0020] A section of the adjusting slider located in the adjusting slot is fixedly connected to an electrode needle or a thermocouple passing through the adjusting slot, and a section of the adjusting slider passing out of the adjusting slot forms an adjusting protrusion for pushing the adjusting slider to slide along the adjusting slot.

[0021] Through the above technical solution, the cables connected to the external ablation host pass through the gripping section and then enter the ablation catheter through the adjusting section. Therefore, the length and ratio of each electrode needle and thermocouple extending to the outside of the ablation catheter can be adjusted through the adjusting slider set on the adjusting section. At the same time, the relative friction between the adjusting slider and the adjusting slot can be used to fix the position of the adjusting slider. When it is necessary to adjust the length of the electrode needles and thermocouples in each electrode assembly extending to the outside of the ablation catheter as a whole, it is only necessary to drive the adjusting section to move along its axial direction. After the adjusting section moves to the set position, it can be locked by the locking structure, thereby completing the coordinated movement between the various electrode groups.

[0022] Furthermore, a threaded groove is provided on the adjusting slider on one side facing the opening of the adjusting slot, and a locking knob for locking the adjusting slider and the adjusting slot is threadedly connected on the adjusting slider;

[0023] The surface of the adjustment section is provided with scales corresponding to each adjustment slide groove and used to indicate the sliding distance of the adjustment slide block.

[0024] Through the above technical solution, the length of each electrode needle extending outside the ablation catheter and the ratio thereof can be accurately preset.

[0025] Furthermore, the diameter of the connecting section is smaller than the diameter of the end face of the gripping section connected thereto, and an annular groove is formed on the end face where the gripping section and the connecting section meet, and an annular protrusion matching the annular groove is provided on one end of the adjusting section, axially.

[0026] The bottom of the annular groove is uniformly provided with transition channels connected to the wiring channel along its circumference, and each wiring sub-channel on the adjustment section extends into the annular protrusion. When the annular groove fits with the annular protrusion, each wiring sub-channel corresponds to each transition channel and is connected.

[0027] A positioning groove is arranged on the inner side wall of the annular groove along its length direction, and a positioning protrusion is arranged on the annular protrusion along its length direction which is slidably connected with the positioning groove.

[0028] Through the above technical scheme, the connection between the connecting section and the holding section can be made tighter, so that the electrode needles in the electrode group can be stably inserted into the wiring channel and the wiring sub-channel; the cooperation of the positioning groove and the positioning protrusion can not only prevent the connecting section from rotating, but also prevent the connecting section and the holding section from being misaligned during production and assembly, thereby ensuring the corresponding connection between the transition channel and each wiring sub-channel.

[0029] Furthermore, the connecting section and the holding section are integrally formed, and the ablation catheter is coaxially fixedly connected to an end of the connecting section away from the holding section;

[0030] The wiring channel in the connecting section is arranged along its axial direction and is connected with the inner tube opening in the ablation catheter;

[0031] A section of the side wall of the ablation catheter close to the connecting section is provided with a plurality of wire entry holes corresponding to and connected with each placement channel one by one, and the plurality of wire entry holes correspond to the outlets of each wiring sub-channel on the adjusting section;

[0032] The outer wall of one end of the gripping section connected to the connecting section is provided with a thread, and the locking structure and linkage structure include a driving rotary cylinder threadedly sleeved on the gripping section;

[0033] A convex ring is provided on the inner side wall of the end of the driving rotary cylinder away from the gripping section along its circumference, and an annular groove matching the convex ring is provided on the outer side wall of the adjusting section close to the gripping section along its circumference, and the driving rotary cylinder is coaxially rotatably connected with the connecting section;

[0034] A strip-shaped limiting block is arranged on the outer side wall of the connecting section along its length direction, and a limiting groove which is slidably matched with the limiting block is arranged on the inner side wall of the connecting section along its length direction.

[0035] Through the above technical solution, when it is necessary to push the electrode needles in each electrode group out of the ablation catheter, it is only necessary to rotate the drive rotary cylinder to push the entire adjustment section along its length direction, that is, the direction of the ablation catheter, thereby completing the overall synchronous drive of each electrode group. By setting the limit block and the limit groove, it is possible to further prevent the adjustment section from rotating relative to the connecting section, ensuring that the adjustment section can smoothly drive the electrode groups and / or cooling water pipes to move when moving forward and backward.

[0036] Furthermore, in the wiring sub-channel, the electrode needles and thermocouples located in the transition channel are arranged in a curved shape;

[0037] A shielding plate for shielding the adjusting sliding groove is fixedly arranged on the adjusting sliding block, and an edge of the shielding plate is arranged to fit the outer surface of the adjusting section.

[0038] When the adjustment section moves along its length direction, since the adjustment slider arranged on the adjustment section is fixedly connected to the electrode needle and the thermocouple, the electrode needle and the thermocouple in the wiring sub-channel will be driven to move. Through the above technical scheme, the electrode needle and the thermocouple are arranged in a curved shape, so that when the adjustment section slides toward the ablation catheter, the electrode needle and the thermocouple on the side of the wiring sub-channel away from the ablation catheter will not be broken due to pulling, and will not affect the movement of the adjustment section; by setting a shield, external impurities can be effectively prevented from entering the wiring sub-channel.

[0039] Furthermore, the electrode assembly also includes a plurality of sheet electrodes arranged corresponding to each of the electrode groups, the plurality of sheet electrodes are arranged on the surface of the outer tube of the ablation catheter along the length direction of the ablation catheter and close to the position of the electrode pinholes of each group, each of the sheet electrodes is electrically connected to a specific cable in the wiring channel in the connecting section via a conductive layer plated on the surface of the outer tube of the ablation catheter, and an insulating film for covering the conductive layer is arranged on the outer surface of the outer tube of the ablation catheter;

[0040] During ablation, a current path is formed between each sheet electrode and the corresponding electrode group.

[0041] Through the above technical solution, the direction of the radio frequency current can be guided by utilizing the cooperation between the sheet electrode and the wire electrode needle, thereby making the ablation area more precise and improving the accuracy of the ablation surgery.

[0042] Furthermore, the saline catheter comprises a main saline catheter disposed in the inner tube of the ablation catheter, and a plurality of sub-saline catheters disposed in the placement channel;

[0043] The main saline catheter passes through the end of the inner tube of the ablation catheter to form a main water outlet, and a sub-water outlet is opened on the side wall of the outer tube of the ablation catheter near each electrode group, and each sub-water outlet is located between the electrode needle and the sheet electrode contained in the same electrode group;

[0044] Each sub-saline catheter is arranged in one-to-one correspondence with multiple electrode groups, and its water inlet end is connected to different water storage devices in the ablation host, and the water outlet end passes through the wiring channel, wiring sub-channel, and placement channel and then passes through each sub-water outlet.

[0045] Through the above technical solution, the saline catheter can be used to cool the entire ablation area to avoid the heat generated during ablation from overflowing, thereby ensuring the safe conduct of the ablation operation; each sub-saline catheter can be used to provide saline of different concentrations for the locations of different electrode groups, thereby adjusting the temperature and radio frequency current intensity of the ablation area corresponding to each electrode group, and realizing differentiated radio frequency ablation at the same time.

[0046] A multi-electrode radiofrequency ablation needle control method, based on the multi-electrode radiofrequency ablation needle as described above, comprises:

[0047] Based on the position information of each ablation area and the required ablation parameters, the length ratio of the electrode needles in each electrode group extending out of the ablation catheter is preset and locked by using a preset structure;

[0048] Presetting the radio frequency output parameters of the corresponding wire electrode needles and / or sheet electrodes in each electrode group;

[0049] Preset the saline concentration and pumping rate of the saline conduit corresponding to each electrode group;

[0050] Push the ablation catheter into the lesion, turn on the ablation host and continue for the set time to complete the ablation.

[0051] Through the above technical solution, various ablation parameters can be preset, so that different ablation parameters can be used to ablate different positions of the lesion in the same period of time during the ablation process, thereby improving the efficiency of ablation.

[0052] Compared with the prior art, the present invention has the following beneficial effects:

[0053] (1) By setting a preset structure, the length ratio of each electrode needle extending outside the ablation catheter can be preset, thereby adjusting and presetting the ablation parameters;

[0054] (2) By setting up a linkage structure, the position of each electrode group can be adjusted using the linkage structure, and finally different positions of the lesion can be ablated with different ablation parameters at the same time, which can effectively improve the efficiency of the ablation surgery and reduce the surgical risk;

[0055] (3) Through the cooperation between the sheet electrode and the wire electrode needle, the direction of the radiofrequency current can be guided, thereby making the ablation area more precise and improving the accuracy of the ablation surgery;

[0056] (4) Different concentrations of saline can be provided to different electrode groups through each sub-saline catheter, thereby adjusting the temperature and radio frequency current intensity of the ablation area corresponding to each electrode group, thereby achieving differentiated radio frequency ablation at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] Figure 1 It is an overall schematic diagram of a multi-electrode radiofrequency ablation needle;

[0058] Figure 2 It is a cross-sectional schematic diagram of the cooperation between the connecting section and the adjusting section;

[0059] Figure 3 It is a schematic diagram of the structure of the connection section and the adjustment section;

[0060] Figure 4 is a cross-sectional schematic diagram of an ablation catheter;

[0061] Figure 5 Schematic diagram of the structure of the electrode group.

[0062] Reference numerals: 100, handle assembly; 110, grip section; 120, connection section; 130, adjustment section; 1401, wiring channel; 1402, wiring sub-channel; 1403, transition channel; 160, drive drum; 1701, annular groove; 1702, annular protrusion; 1802, positioning protrusion; 190, preset structure; 1901, adjustment slide groove; 1902, adjustment slider; 1903, locking knob; 1904, shield; 190 5. convex ring; 1906. annular groove; 200. ablation catheter; 210. inner tube; 220. outer tube; 230. placement channel; 240. electrode needle hole; 260. wire inlet hole; 270. sub-water outlet; 300. electrode assembly; 310. electrode group; 320. thermocouple; 330. sheet electrode; 340. electrode needle; 400. cable; 410. cable; 420. saline catheter; 4201. main saline catheter; 4202. sub-saline catheter. DETAILED DESCRIPTION

[0063] The present invention will be further described in detail below in conjunction with embodiments and drawings, but the embodiments of the present invention are not limited thereto.

[0064] A multi-electrode radiofrequency ablation needle, such as Figure 1 As shown, it includes a handle assembly 100, an ablation catheter 200 and an electrode assembly 300. The end of the handle assembly 100 away from the ablation catheter 200 is connected to a cable 400 electrically connected to the ablation host, and the cable 400 includes an electric cable 410 and a cooling water pipe, that is, a saline catheter 420.

[0065] The electrode assembly 300 includes multiple groups of electrode groups 310 arranged along the length direction of the ablation catheter 200, and thermocouples 320 arranged one by one with the multiple electrode groups 310. In the embodiment of the present application, the electrode groups 310 are configured as three groups for a clearer illustration. In actual applications, multiple groups can be configured as needed. Figure 1 and Figure 4 As shown, in the embodiment of the present application, the ablation catheter 200 includes an inner tube 210 and an outer tube 220 which are coaxially arranged, and a plurality of spacers are arranged between the outer wall of the inner tube 210 and the inner wall of the outer tube 220 to form a plurality of placement channels 230. The inner tube 210 and the outer tube 220 are made of hard metal materials, or other hard non-metallic insulating materials. If the ablation catheter 200 is made of metal, preferably, an insulating film is provided on the inner tube 210, the outer tube 220 and the spacers. In specific practice, the inner tube 210 and the spacers are arranged as one body, and then penetrated into the outer tube 220 to form the placement channels 230.

[0066] like Figure 2As shown, the side wall of the outer tube 220 away from the handle assembly 100 is provided with a plurality of electrode pinholes 240 for the electrode group 310 to extend from the placement channel 230 to the outside of the outer tube 220. The plurality of electrode pinholes 240 are arranged in a plurality of circles and along the length direction of the outer tube 220, and the positions of the electrode pinholes 240 are respectively connected to different placement channels 230.

[0067] Each electrode group 310 includes a plurality of wire-shaped electrode needles 340 made of stainless steel or titanium alloy, such as 6 or 7. The plurality of electrode needles 340 corresponding to the same electrode group 310 are respectively arranged in a plurality of placement channels 230 in a rotationally symmetrical manner with the axis of the outer tube 220 as the center. The plurality of electrode needles 340 corresponding to different electrode groups 310 are staggered in each placement channel 230. The ends of the plurality of electrode needles 340 away from the handle assembly 100 are spike-shaped and are preferably made of memory alloy. When one end of the electrode needles 340 contained in the electrode group 310 is extended to the outside of the ablation catheter 200 and unfolded, the electrode group 310 is umbrella-shaped as a whole.

[0068] Combination Figure 2 and Figure 4 As shown, a saline catheter 420 connected to the ablation host is also provided in the placement channel 230 of the ablation catheter 200, and a water outlet is opened at a set position on the ablation catheter 200. The saline catheter 420 can be used to inject external saline into the ablation site, thereby achieving temperature control of the ablation site.

[0069] In order to conveniently control the length ratio of each electrode needle 340 extending out of the ablation catheter 200, that is, the lengths of different electrode needles 340 extending out of the ablation catheter 200 are inconsistent, and are set according to the set length ratio, the handle assembly 100 is configured with a preset structure 190 for presetting the length ratio of the electrode needles 340 included in each electrode group 310 extending out of the ablation catheter 200. At the same time, in order to facilitate the operator to adjust the ablation electrode during the operation, the handle assembly 100 is also configured with a linkage structure for driving the coordinated movement of each electrode group 310.

[0070] Combination Figure 1 and Figure 3As shown, the handle assembly 100 mainly includes a gripping section 110, a connecting section 120 and an adjusting section 130. The gripping section 110 is L-shaped as a whole, so that the operator can hold the handle. The connecting section 120 is coaxially fixedly connected to one end face of the gripping section 110. Preferably, in the embodiment of the present application, the gripping section 110 and the connecting section 120 are integrally injection molded by a plastic material, and a section of the gripping section 110 away from the connecting section 120 is provided with anti-slip textures. The ablation catheter 200 is coaxially fixedly connected to one end of the connecting section 120 away from the gripping section 110 and is connected to a wiring channel 1401 opened in the connecting section 120. Preferably, the wiring channel 1401 opened in the connecting section 120 is connected to the tube mouth of the inner tube 210 in the ablation catheter 200. The adjusting section 130 is cylindrical as a whole and is coaxially slidably sleeved on the connecting section 120. Preferably, the outer diameter of the adjusting section 130 is the same as the outer diameter of the gripping section 110 near one end of the adjusting section 130. Preferably, the adjusting section 130 is also made of plastic material.

[0071] In order to fix the adjusting section 130 and the connecting section 120 during surgery, a locking structure for adjusting and locking the relative positions of the adjusting section 130 and the connecting section 120 is provided between the adjusting section 130 and the connecting section 120 .

[0072] like Figure 2 and 3 As shown, a wiring channel 1401 and a water supply channel for the cable 400 and the cooling water pipe to pass through are provided in the gripping section 110, the connecting section 120 and the adjusting section 130. In detail, the wiring channel 1401 and the water supply channel in the gripping section 110 and the connecting section 120 are arranged along the axis of the two, and the wiring channel 1401 in the adjusting section 130 is configured as a plurality of wiring sub-channels 1402. Multiple wiring sub-channels 1402 are close to the surface of the adjustment section 130 and are evenly arranged along the circumference of the adjustment section 130. One end of each wiring sub-channel 1402 in the adjustment section 130 is connected to the wiring channel 1401 in the holding section 110, and the other end corresponds to each placement channel 230 in the ablation catheter 200 one by one and is interconnected. Each thermocouple 320 and multiple electrode needles 340 contained in the electrode group 310 are respectively inserted from the wiring channel 1401 in the holding section 110 into each wiring sub-channel 1402 of the adjustment section 130, and then respectively inserted into each placement channel 230 of the ablation catheter 200.

[0073] Further details, such as Figure 2As shown, in order to make the connection between the connecting section 120 and the holding section 110 tighter and enable the electrode needles 340 in the electrode group 310 to be stably inserted into the wiring channel 1401 and the wiring sub-channel 1402, the diameter of the connecting section 120 is smaller than the diameter of the end face of the holding section 110 connected thereto, and an annular groove 1701 is formed on the end face where the holding section 110 and the connecting section 120 meet, and an annular protrusion 1702 matching the annular groove 1701 is provided on one end of the adjusting section 130, and the transition channel 1403 connected to the wiring channel 1401 is evenly opened at the bottom of the annular groove 1701 along its circumference, and each wiring sub-channel 1402 on the adjusting section 130 extends into the annular protrusion 1702. When the annular groove 1701 fits with the annular protrusion 1702, each wiring sub-channel 1402 corresponds to and is connected to each transition channel 1403.

[0074] In order to prevent the connecting section 120 from rotating and to prevent the connecting section 120 and the holding section 110 from being misaligned during production and assembly, and to ensure the corresponding connection between the transition channel 1403 and each wiring sub-channel 1402, a positioning groove (not shown in the figure) is provided on the inner wall of the annular groove 1701 along its length direction, and a positioning protrusion 1802 that is slidably connected to the positioning groove is provided on the annular protrusion 1702 along its length direction.

[0075] In order to make each wiring sub-channel 1402 correspond to and connect with each placement channel 230 on the ablation catheter 200, a plurality of wire entry holes 260 corresponding to each placement channel 230 are opened on a side wall of the ablation catheter 200 close to the connecting section 120. The plurality of wire entry holes 260 correspond to the outlets of each wiring sub-channel 1402 on the adjustment section 130. In actual application, the diameter of the outer tube 220 of the ablation catheter 200 is slightly reduced on the side close to the connecting section 120 so that the electrode needle 340 or thermocouple 320 in the wiring sub-channel 1402 can be smoothly inserted into the placement channel 230. At the same time, the diameter of the adjustment section 130 close to the ablation catheter 200 is gradually reduced, and the end extends outward along its length direction to form an inverted trumpet, covering one end of the ablation catheter 200.

[0076] like Figure 2 and Figure 3 As shown, the wiring sub-channel 1402 is connected with the side wall surface of the adjustment section 130 to form an adjustment slot 1901 arranged along the length direction of the adjustment section 130, and the preset structure 190 includes an adjustment slider 1902 slidably arranged in the adjustment slot 1901.

[0077] A section of the adjusting slider 1902 located in the adjusting groove 1901 is fixedly connected to the electrode needle 340 or the thermocouple 320 penetrating through the wiring sub-channel 1402, and a section of the adjusting slider 1902 extending out of the adjusting groove 1901 forms an adjusting bump for pushing the adjusting slider 1902 to slide along the adjusting groove 1901. The adjusting slider 1902 is made of plastic, which can be melted during manufacturing and directly pressed against pipelines such as the electrode needle 340 or the thermocouple 320 to fix the two. Based on the above technical solution, the cable 400 and the like connected to the external ablation host pass through the gripping section 110 and then enter the ablation catheter 200 through the adjusting section 130. Thus, the length and ratio of each electrode needle 340 and thermocouple 320 extending outside the ablation catheter 200 can be adjusted through the adjusting slider 1902 provided on the adjusting section 130. At the same time, the relative friction between the adjusting slider 1902 and the adjusting slot 1901 can be used to fix the position of the adjusting slider 1902. When it is necessary to adjust the length of the electrode needles 340 and thermocouples 320 extending outside the ablation catheter 200 in each electrode assembly 300 as a whole, it is only necessary to drive the adjusting section 130 to move along its axial direction. After the adjusting section 130 moves to the set position, it can be locked by the locking structure, thereby completing the coordinated movement between each electrode group 310.

[0078] Preferably, a threaded groove is provided on the adjusting slider 1902 on the side facing the opening of the adjusting slot 1901, and a locking knob 1903 for locking the adjusting slider 1902 and the adjusting slot 1901 is threadedly connected on the adjusting slider 1902. The surface of the adjusting section 130 is provided with scales for indicating the sliding distance of the adjusting slider 1902 corresponding to each adjusting slot 1901. Through the above technical solution, the locking knob 1903 can be used to fix the adjusting slider 1902, that is, to lock the length of the electrode needle 340 or the thermocouple 320 extending outside the ablation catheter 200, and the length of each electrode needle 340 extending outside the ablation catheter 200 and the ratio thereof can be accurately preset.

[0079] When the adjustment section 130 moves along its length direction, since the adjustment slider 1902 arranged on the adjustment section 130 is fixedly connected to the electrode needle 340 and the thermocouple 320, it will drive the electrode needle 340 and the thermocouple 320 in the wiring sub-channel 1402 to move. In order to prevent the electrode needle 340 and the thermocouple 320 on the side of the wiring sub-channel 1402 away from the ablation catheter 200 from breaking due to pulling, the electrode needle 340 and the thermocouple 320 located in the transition channel 1403 of the wiring sub-channel 1402 are arranged in a curved shape. In order to prevent external impurities from entering the wiring sub-channel 1402, a shield 1904 for shielding the adjustment slot 1901 is fixedly provided on the adjustment slider 1902, and the edge of the shield 1904 is arranged to fit the outer surface of the adjustment section 130. In actual application, a triangular indicator arrow is provided on the shield 1904 to cooperate with the scale set on the surface of the adjustment section 130 to indicate the sliding distance of the adjustment slider 1902.

[0080] like Figure 2 and Figure 3 As shown, the outer wall of the end where the gripping section 110 and the connecting section 120 are connected is provided with a thread, and the locking structure and linkage structure include a driving rotary cylinder 160 threadedly sleeved on the gripping section 110, and the surface of the driving rotary cylinder 160 is provided with straight knurling for easy rotation. Figure 2 As shown, a convex ring 1905 is provided along its circumference on the inner side wall of the end of the driving rotary cylinder 160 away from the gripping section 110, and an annular groove 1906 matching the convex ring 1905 is provided along its circumference on the outer side wall of the adjusting section 130 close to the gripping section 110, and the driving rotary cylinder 160 is coaxially rotatably connected with the connecting section 120. A strip-shaped limit block is provided on the outer side wall of the connecting section 120 along its length direction, and a limit groove that slides with the limit block is provided on the inner side wall of the connecting section 120 along its length direction. Based on the above structure, when it is necessary to push the electrode needles 340 in each electrode group 310 to extend out of the ablation catheter 200, it is only necessary to rotate the driving rotary cylinder 160 to push the adjusting section 130 as a whole along its length direction, that is, to move in the direction close to the ablation catheter 200, thereby completing the overall synchronous driving of each electrode group 310. By providing the limit blocks and limit grooves, the adjustment section 130 can be further prevented from rotating relative to the connection section 120, ensuring that the adjustment section 130 can smoothly drive the electrode groups 310 and / or cooling water pipes to move when moving forward and backward. Figure 1 As shown, when the operator uses the ablation electrode of the present application, he only needs one hand to rotate the driving rotary cylinder 160 to adjust the extended length of each electrode needle 340, which is very convenient.

[0081] like Figure 5As shown, the electrode assembly 300 also includes a plurality of sheet electrodes 330 corresponding to each electrode group 310. The plurality of sheet electrodes 330 are arranged on the surface of the outer tube 220 of the ablation catheter 200 along the length direction of the ablation catheter 200 and close to the position of each group of electrode pinholes 240. Each sheet electrode 330 is electrically connected to a specific cable 400 in the wiring channel 1401 in the connecting section 120 via a conductive layer plated on the surface of the outer tube 220 of the ablation catheter 200. An insulating film for covering the conductive layer is provided on the outer surface of the outer tube 220 of the ablation catheter 200. When performing an ablation operation, a current path is formed between each sheet electrode 330 and the corresponding electrode group 310, which can guide the direction of the radio frequency current, thereby making the ablation area more precise and improving the accuracy of the ablation operation.

[0082] In the embodiment of the present application, the saline catheter 420 includes a main saline catheter 4201 disposed in the inner tube 210 of the ablation catheter 200, and a plurality of sub-saline catheters 4202 disposed in the placement channel 230. The main saline catheter 4201 passes through the end of the inner tube 210 of the ablation catheter 200 to form a main water outlet, and a sub-water outlet 270 is provided on the side wall of the outer tube 220 of the ablation catheter 200 near each electrode group 310, and each sub-water outlet 270 is located between the electrode needle 340 and the sheet electrode 330 contained in the same electrode group 310. Each sub-saline catheter 4202 is disposed one by one corresponding to a plurality of electrode groups 310, and its water inlet end is connected to different water storage devices in the ablation host, and the water outlet end passes through the wiring channel 1401, the wiring sub-channel 1402, and the placement channel 230 and then passes through each sub-water outlet 270. The above technical solution can use the saline catheter 420 to cool the entire ablation area, avoid the heat generated during ablation from spilling out, and ensure the safety of the ablation operation. At the same time, each sub-saline catheter 4202 can be used to provide saline of different concentrations to the locations of different electrode groups 310, thereby adjusting the temperature and radio frequency current intensity of the ablation area corresponding to each electrode group 310, and achieving differentiated radio frequency ablation at different locations at the same time. In practice, the saline concentration in the water storage device in the above ablation host can be set in advance to ensure the smooth progress of the ablation operation.

[0083] From the above disclosed multi-electrode radiofrequency ablation needle structure, it can be seen that the present application scheme can use the preset structure 190 in the handle assembly 100 to preset the length ratio of each electrode needle 340 extending outside the ablation catheter 200, thereby adjusting and presetting the ablation parameters. During the ablation operation, the position of each electrode group 310 can be adjusted by using the above linkage structure, and finally ablation of different positions of the lesion with different ablation parameters can be achieved at the same time. Using saline of different concentrations and paired filament electrode needles 340 and sheet electrodes 330 can make the ablation position more accurate, effectively improve the efficiency of the ablation operation, and reduce the risk of the operation.

[0084] Based on the above multi-electrode radiofrequency ablation needle, the present application also proposes a multi-electrode radiofrequency ablation needle control method, which mainly includes the following steps:

[0085] S1, based on the position information of each ablation area and the required ablation parameters, the length ratio of the electrode needle 340 in each electrode group 310 extending out of the ablation catheter 200 is preset and locked by using the preset structure 190;

[0086] S2, presetting the radio frequency output parameters of the wire electrode needles 340 and / or sheet electrodes 330 corresponding to each electrode group 310;

[0087] S3, presetting the saline concentration and pumping rate of the saline conduit 420 corresponding to each electrode group 310;

[0088] S4, check and confirm whether the settings of various parameters are correct, then push the ablation catheter 200 into the lesion site, turn on the ablation host and continue for the set time to complete the ablation.

[0089] Through the above technical solution, various ablation parameters can be preset, so that different ablation parameters can be used to ablate the lesion site at the same time during the ablation process, thereby improving the ablation efficiency.

[0090] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A multi-electrode radiofrequency ablation needle, comprising a handle assembly (100), an ablation catheter (200) and an electrode assembly (300), wherein the ablation catheter (200) is provided with a saline catheter (420) connected to an ablation host, and a water outlet is provided on the ablation catheter (200), characterized in that: The electrode assembly (300) comprises a plurality of electrode groups (310) arranged along the length direction of the ablation catheter (200), and thermocouples (320) arranged in one-to-one correspondence with the plurality of electrode groups (310); The handle assembly (100) is provided with a preset structure (190) for presetting the length ratio of the electrode needles (340) contained in each electrode group (310) extending outside the ablation catheter (200), and a linkage structure for driving each electrode group (310) to move in coordination; The ablation catheter (200) comprises an inner tube (210) and an outer tube (220) which are coaxially arranged, and a plurality of spacers are arranged between the outer wall of the inner tube (210) and the inner wall of the outer tube (220) to form a plurality of placement channels (230); A plurality of electrode pinholes (240) are provided on the side wall of one end of the outer tube (220) away from the handle assembly (100) for the electrode group (310) to extend from the placement channel (230) to the outside of the outer tube (220); the plurality of electrode pinholes (240) are arranged in multiple circles and along the length direction of the outer tube (220); and the positions of the electrode pinholes (240) are respectively connected to different placement channels (230); Each of the electrode groups (310) comprises a plurality of electrode needles (340); the plurality of electrode needles (340) corresponding to the same electrode group (310) are respectively arranged in a plurality of placement channels (230) in a rotationally symmetrical manner with the axis of the outer tube (220) as the center; and the plurality of electrode needles (340) corresponding to different electrode groups (310) are arranged in staggered manner in each placement channel (230); When one end of the electrode needle (340) contained in the electrode group (310) is extended to the outside of the ablation catheter (200) and deployed, the electrode group (310) as a whole is in an umbrella shape; The handle assembly (100) comprises a gripping section (110), a connecting section (120) and an adjusting section (130); the gripping section (110) is L-shaped; the connecting section (120) is coaxially fixedly connected to one end surface of the gripping section (110); the adjusting section (130) is cylindrical as a whole and is coaxially slidably sleeved on the connecting section (120); a locking structure for adjusting and locking the relative position of the adjusting section (130) and the connecting section (120) is provided between the adjusting section (130) and the connecting section (120); The gripping section (110), the connecting section (120) and the adjusting section (130) are provided with a wiring channel (1401) and a water supply channel for the cables (400) and the cooling water pipe to pass through; The wiring channel (1401) located in the adjustment section (130) is configured as a plurality of wiring sub-channels (1402), and the plurality of wiring sub-channels (1402) are all close to the surface of the adjustment section (130) and are evenly arranged along the circumference of the adjustment section (130). One end of each wiring sub-channel (1402) in the adjustment section (130) is connected to the wiring channel (1401) in the holding section (110), and the other end corresponds to each placement channel (230) in the ablation catheter (200) and is connected to each other. Each thermocouple (320) and the plurality of electrode needles (340) contained in the electrode group (310) are respectively inserted from the wiring channel (1401) in the holding section (110) into each wiring sub-channel (1402) of the adjustment section (130), and then respectively inserted into each placement channel (230) of the ablation catheter (200); The wiring sub-channel (1402) is connected to the side wall surface of the adjustment section (130) to form an adjustment slide groove (1901) arranged along the length direction of the adjustment section (130), and the preset structure (190) includes an adjustment slider (1902) slidably arranged in the adjustment slide groove (1901); A section of the adjusting slider (1902) located in the adjusting slot (1901) is fixedly connected to the electrode needle (340) or the thermocouple (320) inserted therein, and a section of the adjusting slider (1902) extending out of the adjusting slot (1901) forms an adjusting protrusion for pushing the adjusting slider (1902) to slide along the adjusting slot (1901); The diameter of the connecting section (120) is smaller than the diameter of the end face of the holding section (110) connected thereto; the end face of the holding section (110) and the connecting section (120) is concave inwardly around the axial direction of the holding section (110) to form an annular groove (1701); and one end of the adjusting section (130) is provided with an annular protrusion (1702) adapted to the annular groove (1701) around its axial direction; The bottom of the annular groove (1701) is uniformly provided with transition channels (1403) connected to the wiring channel (1401) along its circumference, and each wiring sub-channel (1402) on the adjustment section (130) extends into the annular protrusion (1702). When the annular groove (1701) and the annular protrusion (1702) are fitted together, each wiring sub-channel (1402) corresponds to each transition channel (1403) and is connected. A positioning groove is provided on the inner side wall of the annular groove (1701) along its length direction, and a positioning protrusion (1802) is provided on the annular protrusion (1702) along its length direction and is slidably connected to the positioning groove; The connecting section (120) and the holding section (110) are integrally formed, and the ablation catheter (200) is coaxially fixedly connected to an end of the connecting section (120) away from the holding section (110); The wiring channel (1401) in the connecting section (120) is arranged axially along the connecting section (120) and is connected to the tube opening of the inner tube (210) in the ablation catheter (200); A section of the side wall of the ablation catheter (200) close to the connecting section (120) is provided with a plurality of wire entry holes (260) which are in one-to-one correspondence with each of the placement channels (230), and the plurality of wire entry holes (260) correspond to the outlets of each of the wiring sub-channels (1402) on the adjusting section (130); A thread is formed on the outer wall of one end of the gripping section (110) connected to the connecting section (120); the locking structure and the linkage structure include a driving rotary cylinder (160) threadedly sleeved on the gripping section (110); A convex ring (1905) is provided on the inner side wall of the end of the driving rotary cylinder (160) away from the gripping section (110) along the circumference of the driving rotary cylinder (160), and an annular groove (1906) adapted to the convex ring (1905) is provided on the outer side wall of the end of the adjusting section (130) close to the gripping section (110) along the circumference of the adjusting section (130), and the driving rotary cylinder (160) is coaxially rotatably connected with the connecting section (120); A strip-shaped limiting block is arranged on the outer side wall of the connecting section (120) along its length direction, and a limiting groove which is slidably matched with the limiting block is arranged on the inner side wall of the connecting section (120) along its length direction.

2. The multi-electrode radiofrequency ablation needle according to claim 1, characterized in that: A threaded groove is provided on the adjusting slider (1902) on one side facing the opening of the adjusting slot (1901), and a locking knob (1903) is threadedly connected on the adjusting slider (1902) for locking the adjusting slider (1902) and the adjusting slot (1901); The surface of the adjustment section (130) is provided with scales corresponding to each of the adjustment slide grooves (1901) and used to indicate the sliding distance of the adjustment slider (1902).

3. The multi-electrode radiofrequency ablation needle according to claim 1, characterized in that: In the wiring sub-channel (1402), the electrode needle (340) and the thermocouple (320) located in the transition channel (1403) are arranged in a curved shape; A shielding plate (1904) for shielding the adjusting sliding groove (1901) is fixedly arranged on the adjusting sliding block (1902), and the edge of the shielding plate (1904) is arranged to fit the outer surface of the adjusting section (130).

4. The multi-electrode radiofrequency ablation needle according to claim 1, characterized in that: The electrode assembly (300) further comprises a plurality of sheet electrodes (330) arranged corresponding to each of the electrode groups (310); the plurality of sheet electrodes (330) are arranged on the surface of the outer tube (220) of the ablation catheter (200) along the length direction of the ablation catheter (200) and close to the position of each group of electrode pinholes (240); each of the sheet electrodes (330) is electrically connected to a specific cable (400) in the wiring channel (1401) in the connecting section (120) via a conductive layer plated on the surface of the outer tube (220) of the ablation catheter (200); and an insulating film for covering the conductive layer is arranged on the outer surface of the outer tube (220) of the ablation catheter (200); During ablation, a current path is formed between each sheet-shaped electrode (330) and the corresponding electrode group (310).

5. The multi-electrode radiofrequency ablation needle according to claim 4, characterized in that: The saline catheter (420) comprises a main saline catheter (4201) disposed in the inner tube (210) of the ablation catheter (200), and a plurality of sub-saline catheters (4202) disposed in the placement channel (230); The main saline conduit (4201) passes through the end of the inner tube (210) of the ablation conduit (200) to form a main water outlet, and a sub-water outlet (270) is provided on the side wall of the outer tube (220) of the ablation conduit (200) near each electrode group (310), and each sub-water outlet (270) is located between the electrode needle (340) and the sheet electrode (330) contained in the same electrode group (310); Each of the sub-saline catheters (4202) is arranged in one-to-one correspondence with the plurality of electrode groups (310), and its water inlet end is connected to different water storage devices in the ablation host, and its water outlet end passes through the wiring channel (1401), the wiring sub-channel (1402), the placement channel (230), and then passes through each of the sub-water outlets (270).

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