Composite ablation needle system

Abstract

The utility model relates to a composite ablation needle system, and relates to the technical field of ablation. The composite ablation needle system comprises an ablation needle and a transmission device, the ablation needle comprises a needle head assembly and an insulation connecting assembly, the far end of the needle head assembly is arranged in the insulation connecting assembly, and the near end of the needle head assembly extends out of the insulation connecting assembly. The needle assembly is in insulated connection with the transmission device through the insulated connection assembly, and the needle assembly is in fluid communication with the transmission device. A conductive structure is further arranged in the insulation connecting assembly, and the needle assembly is connected with an energy source through the conductive structure. According to the combined type ablation needle system, multiple ablation modes can be executed on one ablation needle only through one-time needle insertion, the requirement of a treatment scheme can be met, the expected treatment effect can be guaranteed, the burden of a patient can be relieved, the operation pressure of an operator is reduced, the operation process of the operator is simplified, and therefore convenience is provided for the operator.

Description

Technical Field

[0001] The utility model relates to the field of ablation technology, and particularly to a composite ablation needle system. Background Art

[0002] The composite ablation technology is increasingly becoming the main means of tumor treatment. The current main ablation means include radiofrequency ablation, pulsed ablation, cryoablation and other methods. In the actual treatment process, the treatment plan determined according to the lesion situation may select two or more ablation methods in order to obtain better treatment effects. However, the existing ablation needles for various ablation treatments are relatively independent of each other. Therefore, different ablation needles must be replaced during treatment to perform different ablation treatments to achieve the desired treatment effect. Therefore, multiple punctures may be performed during treatment, which not only causes a burden on the patient, but also brings inconvenience to the operation of the operator. Summary of the Utility Model

[0003] The utility model provides a composite ablation needle system for solving at least one of the above technical problems.

[0004] The utility model provides a composite ablation needle system, including an ablation needle and a transmission device. The ablation needle includes a needle head assembly and an insulating connection assembly. The distal end of the needle head assembly is arranged in the insulating connection assembly, and the proximal end of the needle head assembly extends out of the insulating connection assembly.

[0005] Wherein, the needle head assembly is insulated and connected to the transmission device through the insulating connection assembly, and there is a fluid connection between the needle head assembly and the transmission device; a conductive structure is also arranged in the insulating connection assembly, and the needle head assembly is connected to an energy source through the conductive structure.

[0006] In one embodiment, the insulating connection assembly includes an insulating seal sleeve, a connection hole is arranged in the insulating seal sleeve, the transmission device includes a connection sleeve, and the distal end of the insulating connection assembly is accommodated in the connection sleeve.

[0007] A sealing plug pin for inserting and connecting with the connection hole is arranged in the connection sleeve, and the length of the sealing plug pin is less than the hole depth of the connection hole.

[0008] In one embodiment, a first tapered hole connected to the connection hole is arranged at the distal end of the insulating seal sleeve, a connection body is arranged in the connection sleeve, the proximal end of the connection body is connected to the sealing plug pin through a tapered platform, and when the sealing plug pin is inserted and connected with the connection hole, the outer wall of the tapered platform abuts against a part of the inner wall of the first tapered hole.

[0009] In one embodiment, the insulating connection assembly further includes an insulating connection sleeve. The insulating sealing sleeve is disposed inside the distal end of the insulating connection sleeve. A second tapered hole is provided at the distal end of the insulating connection sleeve, and the inner wall of the second tapered hole is farther from the mating axis of the insulating sealing sleeve and the insulating connection sleeve than the inner wall of the first tapered hole.

[0010] In one embodiment, the thermal expansion coefficient of the insulating sealing sleeve is greater than that of the sealing pin.

[0011] In one embodiment, the needle assembly includes an ablation needle inlet tube. The distal end of the ablation needle inlet tube extends into the insulating connection sleeve. A transfer sleeve sleeved on the insulating sealing sleeve is provided in the insulating connection sleeve. The distal end of the ablation needle inlet tube is connected to the transfer sleeve, and the ablation needle inlet tube is in fluid communication with the sealing pin through the insulating sealing sleeve.

[0012] In one embodiment, the needle assembly further includes an ablation needle return tube sleeved outside the ablation needle inlet tube and a heat insulation tube sleeved outside the ablation needle return tube. The distal ends of the ablation needle return tube and the heat insulation tube both extend into the insulating connection sleeve;

[0013] Wherein, a positioning post protruding radially outward is provided on the outer wall of the heat insulation tube, and a positioning hole is provided on the inner wall of the insulating connection sleeve. The positioning post is engaged with the positioning hole.

[0014] In one embodiment, the insulating connection assembly further includes an insulating handle. The insulating handle is located at the proximal end of the insulating connection sleeve and is fixedly connected to the insulating connection sleeve. The ablation needle inlet tube, the ablation needle return tube, and the heat insulation tube penetrate through the insulating handle;

[0015] The conductive structure is located inside the insulating handle and sleeved on the heat insulation tube.

[0016] In one embodiment, a first return cavity and a second return cavity in fluid communication are provided in the connection sleeve. The connecting body is disposed in the second return cavity and has a gap with the inner wall of the first return cavity. The tapered platform and the sealing pin are both disposed in the first return cavity;

[0017] Wherein, the second return cavity further accommodates the insulating sealing sleeve, and the second return cavity is in fluid communication with the first return hole on the insulating sealing sleeve.

[0018] In one embodiment, a locking device is provided on the connection sleeve, and the locking device is used for fixedly connecting with the flange outside the insulating connection sleeve.

[0019] In one embodiment, the transmission device further includes a transmission inlet pipe and a transmission return pipe disposed outside the transmission inlet pipe. The transmission return pipe is connected to the connection sleeve and is in fluid communication with the second return cavity;

[0020] On one side of the connection body opposite to the sealing pin, there is an inlet connection hole which is in fluid communication with the sealing pin, and the transmission inlet pipe extends into the inlet connection hole.

[0021] In one embodiment, it further includes a connector for connecting to an energy source. A first wire hole is provided on the insulating handle, a second wire hole is provided on the conductive structure, and the wire connected to the connector passes through the first wire hole and is connected to the second wire hole.

[0022] Compared with the prior art, the advantages of the present utility model are as follows. Since there is fluid communication between the needle assembly and the transmission device, the transmission device can input the working medium for cryoablation and thermal ablation into the needle assembly; and the insulation between the needle assembly and the transmission device is ensured through the insulating connection assembly, enabling safe radiofrequency ablation and pulsed electric field ablation through the conductive structure; therefore, the composite ablation needle system of the present utility model only needs to insert the needle once to perform multiple ablation methods on one ablation needle, which can not only ensure meeting the requirements of the treatment plan and achieving the expected treatment effect, but also reduce the burden on the patient, lower the operation pressure of the operator, simplify the operation process, and thus provide convenience for the operator. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Hereinafter, the present utility model will be described in more detail based on embodiments with reference to the drawings.

[0024] Figure 1 is a cross-sectional view of the composite ablation needle system in an embodiment of the present utility model;

[0025] Figure 2 is Figure 1 an enlarged view of the connection part between the ablation needle and the transmission device in the composite ablation needle system in

[0026] Figure 3 is Figure 1 an enlarged view of the needle assembly part in

[0027] Figure 4 is Figure 1 a cross-sectional view of the ablation needle in

[0028] Figure 5 is Figure 4 an enlarged view at I;

[0029] Figure 6 is Figure 4Enlarged view of the distal portion of the ablation needle shown;

[0030] Figure 7 is Figure 4 A cross-sectional view taken at A-A;

[0031] Figure 8 is Figure 1 A cross-sectional view of the transmission device in;

[0032] Figure 9 is Figure 8 A cross-sectional view of the connecting sleeve in;

[0033] Figure 10 is Figure 8 A side view of the connecting sleeve in;

[0034] Figure 11 is Figure 3 A schematic structural view of the enhanced heat exchange device in.

[0035] Reference numerals:

[0036] 1. Ablation needle; 2. Transmission device; 3. Connector;

[0037] 11. Needle head assembly; 12. Insulating connection assembly; 13. Conductive structure; 131. Second wire hole;

[0038] 111. Needle head; 1111. Needle tip;

[0039] 112. Heat insulation tube; 1121. Positioning post;

[0040] 113. Inflow tube of ablation needle; 1131. Enhanced heat exchange device;

[0041] 114. Outflow tube of ablation needle; 1141. Second outflow hole;

[0042] 115. Adapter sleeve;

[0043] 121. Insulating seal sleeve; 1211. First tapered hole; 1212. Connection hole;

[0044] 122. Insulating connection sleeve; 1221. Second tapered hole; 1222. Positioning hole; 1223. First outflow hole; 1224. Flange;

[0045] 123. Coaxial mating axis;

[0046] 124. Insulating handle; 1241. First wire hole;

[0047] 21. Connecting sleeve; 211. Sealing pin; 212. Connecting body; 2121. Inflow connection hole; 215. Second outflow cavity; 214. First outflow cavity;

[0048] 213. Conical frustum;

[0049] 22. Transmission inlet pipe; 23. Transmission return pipe; 24. Locking device;

[0050] 31. Conducting wire. Detailed implementation manner

[0051] The present utility model will be further described below in conjunction with the accompanying drawings.

[0052] As Figure 1 shown, the present utility model provides a composite ablation needle system, which includes an ablation needle 1 and a transmission device 2. The ablation needle 1 is connected to the transmission device 2. The transmission device 2 can transport cryogenic working fluids (such as liquid argon, liquid nitrogen, liquid helium, etc.) or thermal working fluids (such as absolute ethanol, nitrogen, helium, etc.) into the ablation needle 1, so that the ablation needle 1 can perform cryoablation and thermal ablation. In addition, the composite ablation needle system further includes a connector 3 that is electrically connected to the ablation needle 1. The connector 3 can be connected to an energy source, so that the ablation needle 1 can perform radiofrequency ablation or pulsed electric field ablation. Therefore, the composite ablation needle system of the present utility model can implement one or more ablation methods on the same ablation needle 1, thereby achieving a better treatment effect and providing convenience for the operator. The connector 3 can adopt various connectors known in the prior art.

[0053] It can be understood that when performing radiofrequency ablation or pulsed electric field ablation, it is necessary to ensure an insulated connection between the ablation needle 1 and the transmission device 2.

[0054] Specifically, as Figure 1 and Figure 2 shown, the ablation needle 1 includes a needle head assembly 11 and an insulated connection assembly 12. The distal end of the needle head assembly 11 is disposed in the insulated connection assembly 12, and the proximal end of the needle head assembly 11 extends out of the insulated connection assembly 12. Among them, the needle head assembly 11 is insulatedly connected to the transmission device 2 through the insulated connection assembly 12, and there is a fluid connection between the needle head assembly 11 and the transmission device 2, so that the transmission device 2 can input cryogenic working fluids and thermal working fluids into the needle head assembly 11, and the needle head assembly 11 will not affect the transmission device 2 when performing radiofrequency ablation or pulsed electric field ablation.

[0055] As Figure 2 shown, a conductive structure 13 is further disposed in the insulated connection assembly 12. The needle head assembly 11 is connected to the energy source through the conductive structure 13. The conductive structure 13 can be, for example, a conductive ring surrounding the needle head assembly 11, which can transfer energy to the ablation area at the proximal end of the needle head assembly 11 (such as the area shown as A in Figure 3 and Figure 4 ), so that high-frequency current can be released in the ablation area, generating frictional heat energy, resulting in necrosis and coagulation of the tissue where the ablation area is located.

[0056] As Figure 3 and Figure 4 shown, the needle assembly 11 includes a needle 111, an ablation needle inlet tube 113, an ablation needle return tube 114, and a heat insulation tube 112. Among them, the proximal end of the needle 111 is a needle tip 1111 for puncturing, and the distal end of the needle 111 is connected to the proximal end of the heat insulation tube 112.

[0057] The ablation needle inlet tube 113 extends through the heat insulation tube 112 and the needle 111, and its distal end is in fluid communication with the transmission inlet tube 22 of the transmission device 2. Therefore, the cold working fluid and the hot working fluid can be transmitted into the ablation needle inlet tube 113, and the ablation needle inlet tube 113 and the transmission inlet tube 22 form an inlet flow path. The ablation needle return tube 114 is disposed outside the ablation needle inlet tube 113 and only covers a part of the ablation needle inlet tube 113. The part of the ablation needle inlet tube 113 where the enhanced heat exchange device 1131 is provided is not covered by the ablation needle return tube 114, and this is the ablation area of the ablation needle 1, as Figure 3 and Figure 4 shown by the area "A" in

[0058] A return flow path is formed between the inner wall of the ablation needle return tube 114 and the outer wall of the ablation needle inlet tube 113, and it is in fluid communication with the second return cavity 215 of the transmission device 2. The proximal end of the ablation needle inlet tube 113 has an opening, and it is in fluid communication with the ablation needle return tube 114 through the opening. Therefore, after the hot working fluid and the cold working fluid flowing out of the opening of the ablation needle inlet tube 113 undergo heat exchange in the ablation area, they can return to the second return cavity 215 of the transmission device 2 along the return flow path formed by the ablation needle return tube 114 and the ablation needle inlet tube 113.

[0059] The heat insulation tube 112 is sleeved outside the ablation needle return tube 114. The heat insulation tube 112 can completely cover the ablation needle return tube 114. A vacuum layer can be formed between the heat insulation tube 112 and the ablation needle return tube 114, or it can be filled with heat insulation material, so that the cold working fluid and the hot working fluid in the ablation needle return tube 114 are adiabatic to the external environment. That is to say, only the part of the needle assembly 11 where the enhanced heat exchange device 1131 is located can conduct heat exchange, and the rest of the parts are adiabatic / insulated from the outside.

[0060] It can be understood that the above-mentioned needle 111, ablation needle inlet tube 113, ablation needle return tube 114, and heat insulation tube 112 are all made of metal materials (such as stainless steel) to achieve electrical connection with the conductive structure 13.

[0061] As Figure 4 , Figure 5 and Figure 6As shown, the insulation connection assembly 12 includes an insulation handle 124, an insulation connection sleeve 122, and an insulation seal sleeve 121. Among them, the insulation handle 124 is arranged at the proximal end of the insulation connection sleeve 122 and is fixedly connected thereto. The insulation handle 124 and the insulation connection sleeve 122 can be fixed, for example, by threaded connection. The insulation seal sleeve 121 is arranged inside the distal end of the insulation connection sleeve 122 and is used to connect with the transmission device 2.

[0062] As Figure 4 shown, the distal ends of the ablation needle inflow tube 113, the ablation needle return tube 114, and the heat insulation tube 112 all penetrate through the insulation handle 124 and extend into the insulation connection sleeve 122. The heat insulation tube 112 can be tightly connected to the proximal end of the insulation handle 124, so that the needle assembly 11 and the insulation handle 124 form an integral body.

[0063] A transfer sleeve 115 is arranged on the distal side of the heat insulation tube 112, and the transfer sleeve 115 can be made of the same material as the heat insulation tube 112. The insulation seal sleeve 121 is arranged in the transfer sleeve 115, and the two can be connected by means such as threaded connection or snap connection. Through the insulation seal sleeve 121, an insulation connection can be formed between the needle assembly 11 and the transmission device 2.

[0064] As Figure 5 shown, a connection hole 1212 is arranged in the insulation seal sleeve 121. After the insulation seal sleeve 121 is connected to the transfer sleeve 115, the connection hole 1212 is in fluid communication with the ablation needle inflow tube 113. Therefore, the cold working medium and the hot working medium can flow into the ablation needle inflow tube 113 from the connection hole 1212.

[0065] As Figure 5 shown, a first return hole 1223 is arranged on the insulation connection sleeve 122, and a second return hole 1141 is arranged at the distal end of the ablation needle return tube 114. The first return hole 1223 is in fluid communication with the second return hole 1141. Therefore, the cold working medium and the hot working medium after heat exchange returning along the return path formed by the ablation needle return tube 114 and the ablation needle inflow tube 113 can flow into the first return hole 1223 from the second return hole 1141.

[0066] As Figure 8 and Figure 9 shown, the transmission device 2 includes a connection sleeve 21, and the connection sleeve 21 houses the distal end of the insulation connection assembly 12. A sealing plug pin 211 for insertion and connection with the connection hole 1212 is arranged in the connection sleeve 21. The length of the sealing plug pin 211 is less than the hole depth of the connection hole 1212 to ensure a safe electrical clearance between the needle assembly 11 and the transmission device 2. The sealing plug pin 211 and the connection hole 1212 are in a small clearance fit so that the sealing plug pin 211 can be smoothly inserted into the connection hole 1212.

[0067] As shown Figure 5 in Figure 5 , a first tapered hole 1211 connected to the connection hole 1212 is provided at the distal end of the insulating seal sleeve 121. As shown Figure 9 in Figure 9 , a connection body 212 is provided in the connection sleeve 21. The proximal end of the connection body 212 is connected to the sealing pin 211 through a tapered table 213. Please refer to Figure 2 Figure 2 . When the sealing pin 211 is inserted and connected to the connection hole 1212, the outer wall of the tapered table 213 abuts against a part of the inner wall of the first tapered hole 1211. Therefore, a hard seal is formed between the tapered table 213 and the first tapered hole 1211.

[0068] Furthermore, please continue to refer to Figure 5 Figure 5 . A second tapered hole 1221 is provided at the distal end of the insulating connection sleeve 122. The second tapered hole 1221 may have the same taper as the first tapered hole 1211, but the inner wall of the second tapered hole 1221 is farther from the mating axis 123 of the insulating seal sleeve 121 and the insulating connection sleeve 122 than the inner wall of the first tapered hole 1211. Therefore, when the sealing pin 211 is inserted and connected to the connection hole 1212, a part of the tapered table 213 will first abut against a part of the inner wall of the first tapered hole 1211, and as the sealing pin 211 further penetrates into the connection hole 1212, another part of the tapered table 213 will abut against the inner wall of the second tapered hole 1221.

[0069] Taking the threaded connection formed between the insulating handle 124 and the insulating connection sleeve 122 as an example, when connecting the transmission device 2 to the ablation needle 1, the sealing pin 211 is inserted into the connection hole 1212, and the tapered table 213 abuts against a part of the inner wall of the first tapered hole 1211 and a part of the inner wall of the second tapered hole 1221 respectively, that is, the transmission device 2 pushes against the distal ends of the needle head assembly 11 and the insulating connection sleeve 122; while the insulating handle 124 connected to the needle head assembly 11 is threadedly connected to the insulating connection sleeve 122. Therefore, by rotating the insulating handle 124, it can drive the insulating connection sleeve 122 to move distally until the inner end surface of the insulating connection sleeve 122 (i.e., the inner end surface of the second tapered hole 1221) abuts against the distal end of the insulating seal sleeve 121, and the sealed connection between the insulating seal sleeve 121 and the insulating connection sleeve 122 can be achieved.

[0070] In addition, the thermal expansion coefficient of the insulating seal sleeve 121 is greater than that of the sealing pin 211. For example, the insulating seal sleeve 121 can be made of low-temperature-resistant non-metallic materials such as polytetrafluoroethylene (PTEF), polyimide (PI), polyoxymethylene resin (POM), etc.). The sealing pin 211 is made of a metal material. Therefore, its thermal expansion coefficient is different from that of the insulating seal sleeve 121. Thus, when delivering the cryogenic working fluid, the insulating seal sleeve 121 will hold the sealing pin 211 more tightly due to thermal expansion and contraction, thereby achieving the effect of double sealing.

[0071] As shown in Figure 4 and Figure 7 shown, on the outer wall of the adiabatic tube 112, there are positioning posts 1121 protruding radially outward along it, and on the inner wall of the insulating connection sleeve 122, there are positioning holes 1222. The positioning posts 1121 cooperate with the positioning holes 1222, thereby preventing the throttling rotation of the insulating connection sleeve 122. In addition, the cooperation between the positioning posts 1121 and the positioning holes 1222 also has the effect of preventing the connection between the insulating connection sleeve 122 and the insulating handle 124 from loosening. Since the transmission device 2 and the insulating connection sleeve 122 can be repeatedly connected and disassembled, after the needle assembly 11 penetrates into the insulating connection sleeve 122, the positioning posts 1121 on the adiabatic tube 112 are snapped into the positioning holes 1222, that is, a snap connection is added between the adiabatic tube 112 and the insulating connection sleeve 122. Thus, when the insulating connection sleeve 122 and the transmission device 2 are repeatedly connected and disassembled, it will not cause the connection between it and the insulating handle 124 to loosen.

[0072] As shown in Figure 8 , Figure 9 and Figure 10 shown, the transmission device 2 further includes the connection sleeve 21 described above. On the connection sleeve 21, there is a locking device 24, and the locking device 24 is used to be fixedly connected to the flange 1224 on the outside of the insulating connection sleeve 122 (as shown in Figure 6 shown). It can be understood that the locking device 24 can be a receiving groove with a threaded structure, or it can also be a quick-release structure that can be quickly disassembled. As shown in Figure 6 shown, on the outside of the insulating connection sleeve 122, there is a flange 1224 protruding radially outward. It can be arranged in the locking device 24 and fixedly connected to the locking device 24. The distal end of the insulating handle 124 can abut against one side of the flange 1224.

[0073] As shown in Figure 8 and Figure 9 shown, in the connection sleeve 21, there are a first return cavity 214 and a second return cavity 215 that are in fluid communication. The connection body 212 is arranged in the second return cavity 215, and there is a gap between the connection body 212 and the inner wall of the second return cavity 215, so that the working medium in the first return cavity 214 can flow into the transmission return pipe 23 from this gap. The connection body 212 and the connection sleeve 21 can be integrally formed.

[0074] The conical table 213 and the sealing pin 211 are both arranged in the first return cavity 214. The first return cavity 214 is also used to accommodate the insulating connection sleeve 122. Please refer to Figure 2 , Figure 5 , Figure 8 and Figure 9When the insulating connection sleeve 122 is inserted into the first return cavity 214, the sealing pin 211 is inserted into the connection hole 1212, and the tapered table 213 abuts against partial inner walls of the first tapered hole 1211 and the second tapered hole 1221.

[0075] Therefore, the first return cavity 214 is in fluid communication with the first return hole 1223 on the insulating connection sleeve 122. Understandably, the cooled and heated working fluids that return along the return path formed by the ablation needle return pipe 114 and the ablation needle inlet pipe 113 flow into the first return hole 1223 from the second return hole 1141, and flow into the first return cavity 214 from the first return hole 1223, and then flow into the second return cavity 215.

[0076] Furthermore, as Figure 8 and Figure 9 shown, the transmission device 2 further includes a transmission inlet pipe 22 and a transmission return pipe 23 arranged outside the transmission inlet pipe 22. Among them, the transmission return pipe 23 is connected to the connection sleeve 21 and is in fluid communication with the second return cavity 215. Therefore, the working fluid in the second return cavity 215 can be recovered through the transmission return pipe 23 (or discharged into the air). Therefore, the return path formed by the outer wall of the ablation needle return pipe 114 and the inner wall of the ablation needle inlet pipe 113, the second return hole 1141, the first return hole 1223, the second return cavity 215, the first return cavity 214, and the transmission return pipe 23 form a complete return path for the working fluid to return. As Figure 1 、 Figure 2 、 Figure 5 、 Figure 8 and Figure 9 the arrows shown indicate the flow direction of the working fluid.

[0077] As Figure 8 and Figure 9 shown, an inlet connection hole 2121 is provided on one side of the connection body 212 opposite to the sealing pin 211. The inlet connection hole 2121 is in fluid communication with the sealing pin 211, and the transmission inlet pipe 22 extends into the inlet connection hole 2121. Please combine Figure 2 The transmission inlet pipe 22 is inserted into the inlet connection hole 2121. The inlet connection hole 2121 is in fluid communication with the sealing pin 211; the sealing pin 211 is inserted into the connection hole 1212 and is in fluid communication with the ablation needle inlet pipe 113. Therefore, the working fluid is conveyed through the transmission inlet pipe 22 and input into the ablation needle inlet pipe 113 via the sealing pin 211, and is released at the enhanced heat exchange device 1131 near the proximal end of the ablation needle inlet pipe 113 for heat exchange. Therefore, the transmission inlet pipe 22, the sealing pin 211, the ablation needle inlet pipe 113, and the enhanced heat exchange device 1131 form a complete inlet path for the working fluid. As Figure 1 、 Figure 2 、 Figure 5And Figure 8 As shown by the arrow in the figure, it is the flow direction of the working fluid.

[0078] The transmission inlet pipe 22 can be made of a metal material that can withstand pressure and remain flexible at low temperatures, preferably copper pipes, stainless steel pipes, cupronickel, etc. The transmission return pipe 23 can be made of a metal material or a non-metal material, preferably a non-metal material resistant to low temperatures, to reduce the overall weight of the transmission device 2 and maintain a certain flexibility. At the same time, since the thermal conductivity of the non-metal material is lower than that of the metal material, the non-metal transmission return pipe 23 can also effectively reduce heat exchange with the outside, reducing both energy loss and being beneficial to the outer layer insulation.

[0079] As Figure 11 shown, the enhanced heat exchange device 1131 at the proximal end of the ablation needle inlet pipe 113 is a spiral pipe that spirally extends along the axis of the ablation needle inlet pipe 113. When the working fluid flows in, the working fluid can flow spirally along the spiral pipe and flow out from the throttling holes on the enhanced heat exchange device 1131 to the space between the outer wall of the enhanced heat exchange device 1131 and the inner wall of the needle tip 111. When the working fluid flows between the outer wall of the enhanced heat exchange device 1131 and the needle tip 111, it also flows spirally along the spiral pipe to extend the flow path of the working fluid, thereby playing a role in enhancing heat exchange.

[0080] The working fluid after heat exchange flows into the return passage between the ablation needle return pipe 114 and the ablation needle inlet pipe 113, and is recovered via the transmission return pipe 23.

[0081] As Figure 6 shown, a first wire hole 1241 is provided on the insulating handle 124, and a second wire hole 131 is provided on the conductive structure 13. As Figure 4 shown, the wire 31 connected to the connector 3 passes through the first wire hole 1241 and is connected to the second wire hole 131. Since all components of the needle tip assembly 11 are made of metal materials, the conductive structure 13 outside the heat insulation tube 112 can transmit energy to the ablation area of the needle tip 111, thereby realizing radiofrequency ablation or pulsed electric field ablation.

[0082] In addition, during radiofrequency ablation, cold working fluid can also be input into the ablation needle inlet pipe 113 at the same time, so as to avoid the temperature in the ablation area being too high and play a role in preventing tissue carbonization.

[0083] In addition, except for the ablation area, the rest of the needle tip assembly 11 is insulated. For example, the part of the heat insulation tube 112 exposed outside the insulating handle 124 (such as Figure 4The part shown as “B” can be insulated from the outside by applying an insulating coating or sleeving an insulating sleeve (such as a PI tube). Thus, only the ablation area where the enhanced heat exchange device 1131 is located on the needle 111 of the needle assembly 11 can conduct temperature exchange, and the other parts of the needle assembly 11 are insulated from the transmission device 2 by insulating components (such as the insulating handle 124, the insulating connecting sleeve 122, and the insulating sealing sleeve 121) or an insulating coating.

[0084] The composite ablation needle system of the present invention may further include a control system, which can be connected to an energy source and a working fluid source (for delivering the working fluid to the transmission device 2) and control the working modes of the energy source and the working fluid source.

[0085] The working mode of the composite ablation needle system of the present invention will be described below.

[0086] When cryotherapy is required, the control system controls the working fluid source to input the working fluid into the ablation needle 1 through the transmission device 2. The working fluid can be, for example, the cryogenic working fluids such as liquid argon, liquid nitrogen, and liquid helium described above, or a throttling gas (such as argon or nitrogen). In the present invention, the working fluid is preferably nitrogen, which is beneficial to system integration.

[0087] Through system control, the working fluid (gas) enters the transmission inlet pipe 22 of the transmission device 2, and enters the ablation needle inlet pipe 113 through the sealed insertion needle 211, and reaches the enhanced heat exchange device 1131. At the enhanced heat exchange device 1131 of the needle assembly 11, the gas undergoes throttling expansion when flowing out of the enhanced heat exchange device 1131, and its temperature decreases, thus achieving a cryogenic effect; the working fluid after heat exchange returns along the return flow path. The non-ablation area of the needle assembly 11 is insulated by the heat-insulating pipe 112, so it can be in a normal temperature state.

[0088] When thermal ablation is required, absolute ethanol or nitrogen described above can be selected as the thermal working fluid, enter the ablation needle 1 along the inlet flow path described above, and return along the return flow path, thereby achieving thermal ablation. Or helium can also be used as the working fluid. When it reaches the enhanced heat exchange device 1131 of the needle assembly 11, the gas undergoes throttling expansion, and its temperature rises, thereby achieving thermal ablation.

[0089] When thermal ablation is required, radiofrequency ablation can also be selected. Through the control system, the energy of the energy source is transmitted through the connector 3 to the conductive structure 13, and then from the conductive structure 13 to the ablation area at the proximal end of the ablation needle 1 (i.e., the part of the needle tip 111 where the enhanced heat exchange device 1131 is located, which can be used as an ablation electrode), releasing high-frequency current to generate frictional heat energy, resulting in tissue necrosis and coagulation. Except for the ablation area, the rest of the needle assembly 11 is insulated to ensure safety. In addition, when performing radiofrequency ablation, the control system can also control the working fluid source to output cryogenic working fluid (nitrogen) to the transmission device 2 and the ablation needle 1 to avoid excessive temperature in the ablation area and prevent tissue carbonization.

[0090] When pulsed electric field ablation is required, through the control system, the energy of the energy source is transmitted through the connector 3 to the conductive structure 13, and then from the conductive structure 13 to the ablation area at the proximal end of the ablation needle 1 (i.e., the part of the needle tip 111 where the enhanced heat exchange device 1131 is located, which can be used as an ablation electrode), releasing high-voltage pulses in the microsecond level, so as to form nanoscale irreversible electroporation on the cell membrane, and further achieve the purpose of killing tumors.

[0091] Therefore, the composite ablation needle system of the present utility model can, according to the condition of the lesion, through the control system, achieve one or more ablation methods on one ablation needle 1, so as to achieve a better treatment effect and also provide convenience for the operator.

[0092] It should be noted that, as described herein, the "distal end" refers to the part away from the needle tip 1111, and the "proximal end" refers to the part close to the needle tip 1111.

[0093] Although the present utility model has been described with reference to the preferred embodiments, various improvements can be made to it and components therein can be replaced with equivalents without departing from the scope of the present utility model. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present utility model is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A composite ablation needle system, characterized in that: The invention comprises an ablation needle (1) and a transmission device (2), wherein the ablation needle (1) comprises a needle assembly (11) and an insulating connection assembly (12), wherein the distal end of the needle assembly (11) is arranged in the insulating connection assembly (12), and the proximal end of the needle assembly (11) extends out from the insulating connection assembly (12). The needle assembly (11) is insulated and connected to the transmission device (2) via the insulating connection assembly (12), and the needle assembly (11) and the transmission device (2) are fluidically connected; a conductive structure (13) is also provided in the insulating connection assembly (12), and the needle assembly (11) is connected to an energy source via the conductive structure (13).

2. The composite ablation needle system according to claim 1, characterized in that: The insulating connection assembly (12) comprises an insulating sealing sleeve (121), wherein a connection hole (1212) is provided in the insulating sealing sleeve (121); the transmission device (2) comprises a connecting sleeve (21), wherein the connecting sleeve (21) accommodates the distal end of the insulating connection assembly (12); The connecting sleeve (21) is provided with a sealing pin (211) for being plugged and connected with the connecting hole (1212); the length of the sealing pin (211) is smaller than the hole depth of the connecting hole (1212).

3. The composite ablation needle system according to claim 2, characterized in that: The distal end of the insulating sealing sleeve (121) is provided with a first conical hole (1211) connected to the connecting hole (1212); a connecting body (212) is provided in the connecting sleeve (21); the proximal end of the connecting body (212) is connected to the sealing pin (211) via a conical platform (213); when the sealing pin (211) is plugged and connected to the connecting hole (1212), the outer wall of the conical platform (213) abuts against a portion of the inner wall of the first conical hole (1211).

4. The composite ablation needle system according to claim 3, characterized in that: The insulating connection assembly (12) further comprises an insulating connection sleeve (122), the insulating sealing sleeve (121) being arranged on the inner side of the distal end of the insulating connection sleeve (122), and a second conical hole (1221) being arranged at the distal end of the insulating connection sleeve (122), wherein the inner wall of the second conical hole (1221) is further away from the matching axis (123) between the insulating sealing sleeve (121) and the insulating connection sleeve (122) than the inner wall of the first conical hole (1211).

5. The composite ablation needle system according to any one of claims 2 to 4, characterized in that: The thermal expansion coefficient of the insulating sealing sleeve (121) is greater than the thermal expansion coefficient of the sealing pin (211).

6. The composite ablation needle system according to claim 4, characterized in that: The needle assembly (11) includes an ablation needle flow inlet tube (113), the distal end of the ablation needle flow inlet tube (113) extends into the insulating connecting sleeve (122), the insulating connecting sleeve (122) is provided with an adapter sleeve (115) which is sleeved on the insulating sealing sleeve (121), the distal end of the ablation needle flow inlet tube (113) is connected to the adapter sleeve (115), and the ablation needle flow inlet tube (113) is fluidically connected to the sealing pin (211) through the insulating sealing sleeve (121).

7. The composite ablation needle system according to claim 6, characterized in that: The needle assembly (11) further comprises an ablation needle return tube (114) sleeved on the outside of the ablation needle inlet tube (113) and a heat-insulating tube (112) sleeved on the outside of the ablation needle return tube (114), and the distal ends of the ablation needle return tube (114) and the heat-insulating tube (112) both extend into the insulating connection sleeve (122); The outer wall of the thermal insulation tube (112) is provided with a positioning column (1121) protruding radially outward, and the inner wall of the insulating connection sleeve (122) is provided with a positioning hole (1222), and the positioning column (1121) cooperates with the positioning hole (1222).

8. The composite ablation needle system according to claim 7, characterized in that: The insulating connection assembly (12) further comprises an insulating handle (124), the insulating handle (124) being located at the proximal end of the insulating connection sleeve (122) and being fixedly connected to the insulating connection sleeve (122), the ablation needle inlet tube (113), the ablation needle return tube (114) and the thermal insulation tube (112) passing through the insulating handle (124); The conductive structure (13) is located inside the insulating handle (124) and is sleeved on the thermal insulation tube (112).

9. The composite ablation needle system according to claim 6, characterized in that: The connecting sleeve (21) is provided with a first reflux chamber (214) and a second reflux chamber (215) in fluid communication, the connecting body (212) is arranged in the second reflux chamber (215) and has a gap with the inner wall of the first reflux chamber (214), and the conical platform (213) and the sealing pin (211) are both arranged in the first reflux chamber (214); The second reflux chamber (215) also accommodates the insulating sealing sleeve (121), and the second reflux chamber (215) is fluidically connected to the first reflux hole (1223) on the insulating sealing sleeve (121).

10. The composite ablation needle system according to claim 4, characterized in that: The connecting sleeve (21) is provided with a locking device (24), and the locking device (24) is used to be fixedly connected to the flange (1224) on the outside of the insulating connecting sleeve (122).

11. The composite ablation needle system according to claim 9, characterized in that: The transmission device (2) further comprises a transmission inlet pipe (22) and a transmission return pipe (23) arranged outside the transmission inlet pipe (22), wherein the transmission return pipe (23) is connected to the connecting sleeve (21) and is fluidically connected to the second return chamber (215); An inlet connection hole (2121) is provided on a side of the connector (212) opposite to the sealing pin (211), the inlet connection hole (2121) is in fluid communication with the sealing pin (211), and the transmission inlet pipe (22) extends into the inlet connection hole (2121).

12. The composite ablation needle system according to claim 8, characterized in that: It also includes a connector (3) for connecting to an energy source, the insulating handle (124) is provided with a first wire hole (1241), the conductive structure (13) is provided with a second wire hole (131), and the wire (31) connected to the connector (3) passes through the first wire hole (1241) and is connected to the second wire hole (131).

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