Microwave ablation needle with multi-stage cooling channel
By introducing multi-stage cooling channels and reverse cooling design into the microwave ablation needle, the problem of heat dissipation from the inner core of the coaxial cable is solved, achieving efficient cooling and ensuring ablation effect and safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 百德(苏州)医疗有限公司
- Filing Date
- 2025-05-12
- Publication Date
- 2026-05-12
AI Technical Summary
During the ablation process, the coaxial cable core of the existing microwave ablation needle generates a large amount of heat. The single water inlet and outlet channels are not enough to quickly and effectively remove the heat. Especially during long-term, high-power ablation, the cooling temperature is unstable, which affects the ablation effect and may cause thermal damage to the surrounding tissue.
设计一种具有多级冷却通道的微波消融针，通过在同轴电缆内芯和金属外壳之间设置多组导热翅片和散热薄片，冷却水在冷却通道中流动方向与微波传输方向相反，增强温差驱动力，结合热电偶温度传感器和处理报警模块，实现高效散热。
提高了消融针的冷却效率，确保在长时间、高功率消融时的稳定温度，防止组织热损伤，延长消融针的使用寿命。
Smart Images
Figure CN224220223U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of microwave ablation needle technology, and in particular to a microwave ablation needle with multi-stage cooling channels. Background Technology
[0002] Microwave ablation needles are medical devices used for tumor treatment. They work by delivering microwave energy to tumor tissue, causing it to reach high temperatures and thus ablate the tumor. During microwave ablation, the needle tip and body generate a large amount of heat due to the microwave energy. If this heat cannot be dissipated effectively and promptly, it can not only affect the ablation effect but also cause thermal damage to surrounding healthy tissue, potentially leading to unnecessary medical accidents.
[0003] A Chinese patent with publication number CN221083792U discloses a sterile disposable microwave ablation needle. After microwave ablation is performed on the ablation needle, cooling water is first introduced into the end of the ablation needle tube through the inlet capillary tube, so that the cooling water flows out from the other end of the ablation needle tube and flows into the water chamber. The cooling water filling the water chamber is used to cool the coaxial cable core in the ablation needle tube. The temperature of the cooling water is detected by the installed thermocouple element. After the cooling water is overheated, the water is slowly discharged from the outlet and the outlet pipe to complete the water cooling cycle.
[0004] Regarding the aforementioned technologies, during microwave ablation, the inner core of the coaxial cable generates a large amount of heat. A single water inlet and outlet channel may not be able to quickly and effectively remove the heat, especially during long-term, high-power ablation operations. It is difficult to maintain a stable cooling temperature, which may affect the performance and service life of the ablation needle, and may also pose a potential risk of thermal damage to surrounding tissues. Utility Model Content
[0005] The technical problem to be solved by this utility model is to overcome the defects of the existing technology. This utility model proposes a microwave ablation needle with multi-stage cooling channels to solve the problem that a large amount of heat is generated in the inner core of the coaxial cable during the microwave ablation process, and a single water inlet and outlet channel may not be able to quickly and effectively remove the heat.
[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: a microwave ablation needle with multi-stage cooling channels, comprising a microwave ablation needle, a handle, an ablation needle tube passing through one end of the handle via a sealing element, a high-frequency connector passing through the other end of the handle, a circulating water cavity inside the handle, an insulating sleeve fixedly connected to one end of the ablation needle tube, an ablation needle head fixedly installed at one end of the insulating sleeve, a coaxial cable core welded to one end of the ablation needle head, a high-frequency connector fixedly connected to the coaxial cable core, an insulating layer coated on the surface of the coaxial cable core, a metal shell provided on the outside of the coaxial cable core, a first cooling channel opened between the metal shell and the coaxial cable core, multiple sets of heat-conducting fins fixedly installed between the first cooling channels, the multiple sets of heat-conducting fins contacting the coaxial cable core, a second cooling channel opened between the metal shell and the ablation needle tube, multiple sets of heat dissipation fins fixedly installed between the second cooling channels, the heat dissipation fins fixedly connected to the metal shell, and the microwave ablation needle... During use, the coaxial cable core generates a large amount of heat. A single water inlet and outlet channel is insufficient to meet the requirements for rapid and efficient heat dissipation, especially during prolonged, high-power ablation, where unstable cooling temperatures threaten the performance of the ablation needle. By first introducing cooling into cooling channel one, the heat generated by the coaxial cable core is conducted to the metal shell through heat-conducting fins. Cooling water then dissipates heat from the heat-conducting fins and the metal shell, while simultaneously, cooling water is discharged from cooling channel two, which is opened between the metal shell and the ablation needle tube, circulating and cooling the outer wall of the metal shell. Furthermore, the heat dissipation fins increase the contact time between the cooling water and the outer wall of the metal shell, causing it to flow along an S-shaped path. In cooling channel one, the flow direction of the cooling medium is opposite to the microwave transmission direction, increasing the temperature difference driving force and improving cooling efficiency. In cooling channel two, the flow direction of the cooling medium is opposite to that in cooling channel one, further enhancing the cooling effect and improving the heat dissipation of the coaxial cable core.
[0007] Preferably, the circulating water chamber is connected to the second cooling channel, and the coolant flowing out of the second cooling channel flows into the circulating water chamber for heat dissipation treatment of the metal shell of the grip section.
[0008] Preferably, a water inlet capillary tube is provided through the inside of the handle, which is connected to the first cooling channel. A water outlet is provided at the end of the metal shell near the ablation needle, which is connected to the second cooling channel.
[0009] Preferably, a water outlet capillary tube is installed inside the handle, and multiple sets of thermocouple temperature sensors are fixedly installed inside the handle. When the microwave ablation needle is used, the inner core of the coaxial cable generates a large amount of heat. The cooling liquid is first introduced into the cooling channel one through the water inlet capillary tube. The cooling liquid flowing into the cooling channel one is discharged into the cooling channel two through the water outlet, and then flows into the circulating water chamber and is discharged through the water outlet capillary tube for circulating cooling. During the operation of the microwave ablation needle, the temperature of the microwave ablation needle is monitored by the thermocouple temperature sensors, and the heat dissipation and cooling efficiency of the inner core of the coaxial cable is improved by adjusting the circulation speed.
[0010] Preferably, the metal casing has a water inlet at one end near the water inlet capillary tube, and the water inlet is fixedly connected to the water inlet capillary tube.
[0011] Preferably, an alarm processing module is fixedly installed on the outside of the handle. The alarm processing module is electrically connected to multiple sets of thermocouple temperature sensors. When the microwave ablation needle is used, the alarm processing module prompts the user to alarm the temperature of the microwave ablation needle to prevent the potential risk of thermal damage to human tissue caused by excessively high temperature of the microwave ablation needle.
[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0013] This invention proposes a microwave ablation needle with multi-stage cooling channels. During use, the coaxial cable core generates significant heat, and a single inlet and outlet water channel is insufficient for rapid and efficient heat dissipation. Especially during prolonged, high-power ablation, unstable cooling temperatures threaten the needle's performance. By first introducing cooling into cooling channel one, the heat generated by the coaxial cable core is conducted to the metal casing via heat-conducting fins. Cooling water then dissipates heat from the heat-conducting fins and the metal casing. Simultaneously, cooling water exits from cooling channel two, located between the metal casing and the ablation needle tube, circulating and cooling the outer wall of the metal casing. The heat dissipation fins extend the contact time between the cooling water and the outer wall of the metal casing, allowing the water to flow along an S-shaped path. In cooling channel one, the cooling medium flows in the opposite direction to the microwave transmission direction, increasing the temperature difference driving force and improving cooling efficiency. Cooling channel two uses a flow direction opposite to that of cooling channel one, further enhancing the cooling effect and improving the heat dissipation of the coaxial cable core. Attached Figure Description
[0014] The disclosure of this utility model is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. In the drawings, the same reference numerals are used to refer to the same parts. Wherein:
[0015] Figure 1The schematic diagram illustrates the overall structure according to one embodiment of the present invention. Figure 1 ;
[0016] Figure 2 The schematic diagram illustrates the overall structure according to one embodiment of the present invention. Figure 2 ;
[0017] Figure 3 The schematic diagram shows a schematic view of the internal planar structure of the grip according to one embodiment of the present invention;
[0018] Figure 4 The schematic diagram shows a planar structure of the ablation needle according to one embodiment of the present invention.
[0019] Figure 5 The schematic diagram illustrates the internal structure of a metal casing according to one embodiment of the present invention. Figure 1 ;
[0020] Figure 6 The schematic diagram shows a three-dimensional view of the internal structure of an ablation needle according to one embodiment of the present invention.
[0021] Figure 7 The schematic diagram illustrates the internal structure of a metal casing according to one embodiment of the present invention. Figure 2 .
[0022] The diagram is labeled as follows: 1. Microwave ablation needle; 11. Handle; 111. Circulating water chamber; 112. High-frequency connector; 113. Metal shell; 1131. Coaxial cable inner core; 1132. Heat-conducting fins; 1133. Cooling channel one; 1134. Water outlet; 1135. Water inlet; 114. Water inlet capillary tube; 115. Water outlet capillary tube; 116. Thermocouple temperature sensor; 12. Ablation needle tube; 121. Heat dissipation fin; 122. Insulating sleeve; 123. Cooling channel two; 13. c; 14. Processing alarm module; 15. Seal. Detailed Implementation
[0023] It is readily understood that, based on the technical solution of this utility model, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of this utility model. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative descriptions of the technical solution of this utility model and should not be considered as the entirety of this utility model or as limitations or restrictions on the technical solution of this utility model.
[0024] To further understand the content of this utility model, a detailed description of this utility model will be provided in conjunction with the accompanying drawings.
[0025] According to one embodiment of the present invention, in conjunction with Figure 1-6 The diagram illustrates a microwave ablation needle with multi-stage cooling channels, comprising a microwave ablation needle 1. The microwave ablation needle 1 includes a handle 11. One end of the handle 11 is perforated by an ablation needle tube 12 via a sealing element 15. The other end of the handle 11 is perforated by a high-frequency connector 112. A circulating water chamber 111 is provided inside the handle 11. An insulating sleeve 122 is fixedly connected to one end of the ablation needle tube 12. An ablation needle head 13 is fixedly installed on one section of the insulating sleeve 122. A coaxial cable inner core 1131 is welded to one end of the ablation needle head 13. The high-frequency connector 112 is fixedly connected to the coaxial cable inner core 1131. The inner core 1131 of the coaxial cable is coated with an insulating layer. A metal outer shell 113 is provided on the outside of the inner core 1131. A cooling channel 1133 is formed between the metal outer shell 113 and the inner core 1131 of the coaxial cable. Multiple sets of heat-conducting fins 1132 are fixedly installed between the cooling channel 1133 and the inner core 1131 of the coaxial cable. A cooling channel 123 is formed between the metal outer shell 113 and the ablation needle tube 12. Multiple sets of heat dissipation fins 121 are fixedly installed between the cooling channel 123 and the heat dissipation fins 121 are fixed to the metal outer shell 113. When the microwave ablation needle 1 is in use, the coaxial cable core 1131 generates a large amount of heat. A single water inlet and outlet channel cannot meet the requirements for rapid and efficient heat dissipation. Especially during long-term, high-power ablation, the cooling temperature is unstable, threatening the performance of the ablation needle. By first introducing cooling into the cooling channel 1133, the heat generated by the coaxial cable core 1131 is conducted to the metal shell 113 through the heat-conducting fins 1132. Cooling water dissipates heat from the heat-conducting fins 1132 and the metal shell 113, while simultaneously, cooling water is introduced between the metal shell 113 and the ablation needle tube 12. The cooling water is discharged into the second cooling channel 123, circulating and cooling the outer wall of the metal casing 113. At the same time, under the action of the heat dissipation fins 121, the contact time between the cooling water and the outer wall of the metal casing 113 is increased, allowing it to pass through the outer wall of the metal casing 113 in an S-shaped direction. In the first cooling channel 1133, the flow direction of the cooling medium is opposite to that of the microwave transmission direction, increasing the temperature difference driving force and improving the cooling efficiency. The second cooling channel 123 adopts a method that is opposite to the flow direction of the cooling medium in the first cooling channel 1133, further enhancing the cooling effect and improving the heat dissipation effect of the coaxial cable core 1131.
[0026] Combination Figure 3-4 As shown, the circulating water chamber 111 is connected to the second cooling channel 123. The coolant flowing out of the second cooling channel 123 flows into the circulating water chamber 111 to dissipate heat from the metal shell 113 of the grip section 11.
[0027] Combination Figure 3-5As shown, a water inlet capillary tube 114 is provided through the inside of the grip 11. The water inlet capillary tube 114 is connected to the first cooling channel 1133. A water outlet 1134 is provided at one end of the metal shell 113 near the ablation needle 13. The water outlet 1134 is connected to the second cooling channel 123.
[0028] Combination Figure 3-6 As shown, a water outlet capillary tube 115 is installed through the inside of the handle 11. Multiple sets of thermocouple temperature sensors 116 are fixedly installed inside the handle 11. When the microwave ablation needle 1 is in use, the coaxial cable core 1131 generates a large amount of heat. The cooling liquid is first introduced into the cooling channel 1133 through the water inlet capillary tube 114. The cooling liquid flowing into the cooling channel 1133 is discharged into the cooling channel 2 123 through the water outlet 1134. It flows into the circulating water chamber 111 and is discharged through the water outlet capillary tube 115 for circulating cooling. During the operation of the microwave ablation needle 1, the temperature of the microwave ablation needle 1 is monitored by the thermocouple temperature sensors 116. The heat dissipation and cooling efficiency of the coaxial cable core 1131 is improved by adjusting the circulation speed.
[0029] Combination Figure 5 , Figure 7 As shown, the metal casing 113 has a water inlet 1135 at one end near the water inlet capillary tube 114, and the water inlet 1135 is fixedly connected to the water inlet capillary tube 114.
[0030] Combination Figure 2-3 As shown, a processing alarm module 14 is fixedly installed on the outside of the handle 11. The processing alarm module 14 is electrically connected to multiple sets of thermocouple temperature sensors 116. When the microwave ablation needle 1 is used, the processing alarm module 14 prompts the user to alarm the temperature of the microwave ablation needle 1 to prevent the microwave ablation needle 1 from being too hot and causing potential thermal damage to human tissue.
[0031] In this embodiment, the high-frequency connector 112 transmits microwave signals to the inner core 1131 of the coaxial cable, causing it to generate a large amount of heat. Coolant is introduced into the first cooling channel 1133 through the inlet capillary tube 114. The flow direction of the cooling medium is opposite to the microwave transmission direction. The heat generated by the inner core 1131 of the coaxial cable is conducted to the metal shell 113 through the heat-conducting fins 1132. The coolant dissipates heat and cools the heat-conducting fins 1132 and the metal shell 113. Then, the coolant flows into the second cooling channel 123 through the outlet 1134. Under the action of the heat dissipation fins 121, it makes full contact with the outer wall of the metal shell 113 along the S-shaped direction for further cooling. Then, it flows into the circulating water chamber 111 to dissipate heat to the metal shell 113 of the grip section 11. Finally, it is discharged through the outlet capillary tube 115 to achieve circulating cooling. During this period, the thermocouple temperature sensor 116 monitors the temperature in real time and feeds it back to the processing alarm module 14. If the temperature is abnormal, an alarm is triggered. At the same time, the heat dissipation efficiency of the inner core 1131 of the coaxial cable can be improved by adjusting the circulation speed of the coolant.
[0032] The technical scope of this utility model is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this utility model, and all such modifications and variations should fall within the protection scope of this utility model.
Claims
1. A microwave ablation needle with multi-stage cooling channels, characterized in that: The device includes a microwave ablation needle, comprising a handle, an ablation needle tube extending through a sealing element at one end of the handle, and a high-frequency connector extending through the other end of the handle. A circulating water chamber is provided inside the handle. An insulating sleeve is fixedly connected to one end of the ablation needle tube, and an ablation needle head is fixedly installed at one end of the insulating sleeve. A coaxial cable core is welded to one end of the ablation needle head. The high-frequency connector is fixedly connected to the coaxial cable core. An insulating layer is coated on the surface of the coaxial cable core. A metal outer shell is provided on the outside of the coaxial cable core. A cooling channel one is formed between the metal outer shell and the coaxial cable core. Multiple sets of heat-conducting fins are fixedly installed between the cooling channel one and contact the coaxial cable core. A second cooling channel is formed between the metal outer shell and the ablation needle tube, and multiple sets of heat-dissipating fins are fixedly installed between the cooling channel two and fixedly connected to the metal outer shell.
2. The microwave ablation needle with multi-stage cooling channels according to claim 1, characterized in that: The circulating water chamber is connected to the second cooling channel.
3. The microwave ablation needle with multi-stage cooling channels according to claim 1, characterized in that: A water inlet capillary tube is provided inside the grip, and the water inlet capillary tube is connected to the first cooling channel. A water outlet is provided at the end of the metal shell near the ablation needle, and the water outlet is connected to the second cooling channel.
4. A microwave ablation needle with multi-stage cooling channels according to claim 3, characterized in that: A water outlet capillary tube is installed through the inside of the grip, and multiple sets of thermocouple temperature sensors are fixedly installed inside the grip.
5. A microwave ablation needle with multi-stage cooling channels according to claim 3, characterized in that: The metal casing has a water inlet at one end near the water inlet capillary tube, and the water inlet is fixedly connected to the water inlet capillary tube.
6. A microwave ablation needle with multi-stage cooling channels according to claim 4, characterized in that: An alarm processing module is fixedly installed on the outside of the grip, and the alarm processing module is electrically connected to multiple sets of thermocouple temperature sensors.