An ablation needle

Abstract

This invention belongs to the field of medical device technology, specifically relating to an ablation needle. The ablation needle includes a handle, and at one end of the handle, an angle adjustment rod, a needle shaft, and a needle tip are fixed sequentially from proximal to distal. The angle adjustment rod, needle shaft, and needle tip are internally interconnected. A water tank is fixed inside the handle, and a coaxial cable is assembled inside the handle. The coaxial cable includes an inner conductor, an insulating layer, and an outer conductor arranged coaxially from the inside to the outside, with one end of the inner conductor and the insulating layer extending into the needle tip. The microwave ablation needle provided by this invention can simultaneously adapt to two microwave frequencies, 915MHz and 2450MHz, and these two microwave frequencies support two different ablation patterns. This allows the ablation pattern of the device to switch between a teardrop shape and an oblong shape. In clinical use, the position of the spiral element is adjusted according to the microwave frequency required, ensuring that the antenna size matches the microwave frequency, thus avoiding the need to replace the ablation needle due to microwave frequency adjustments.

Description

Technical Field

[0001] This invention belongs to the field of medical device technology, and specifically relates to an ablation needle. Background Technology

[0002] Microwave ablation, as a minimally invasive treatment, has been widely used in the clinical treatment of tumors and other lesions. The performance of its core component, the microwave ablation needle, directly determines the accuracy and safety of the ablation effect. Helical dipole antennas, with their unique electromagnetic radiation characteristics, have potential advantages in microwave energy transmission and focusing, and are gradually becoming an important research direction in the design of ablation needle antenna structures. The optimization and upgrading of related technologies are of great significance for improving the adaptability and flexibility of microwave ablation therapy.

[0003] However, existing microwave ablation needles still have significant technical shortcomings in actual clinical applications: On the one hand, their antenna structure design is fixed and cannot be adapted to microwave energy of different frequencies. This means that when performing multiple ablation treatments on lesions, it is necessary to frequently change ablation needles of different specifications according to the shape and size of the ablation area in each treatment. This not only increases the complexity of the surgical procedure and prolongs the operation time, but may also increase the patient's trauma risk and treatment cost. On the other hand, the insertion angle of the ablation needle lacks adjustability, making it difficult to accurately adapt to the location, depth, and distribution of surrounding normal tissues. This can easily cause the microwave energy radiation range to deviate from the target area, affecting the thoroughness of ablation and potentially causing unnecessary damage to surrounding healthy tissues.

[0004] In summary, the shortcomings of existing microwave ablation needles in terms of microwave frequency adaptability and insertion angle adjustment limit their application in complex lesion treatment scenarios and cannot meet the clinical demand for precise and specialized ablation treatment. Summary of the Invention

[0005] The purpose of this invention is to provide an ablation needle that can be adapted to both 915MHz and 2450MHz microwave frequencies, and the two microwave frequencies can be adapted to two different ablation patterns. This allows the ablation pattern of the device to be changed between a teardrop shape and an oblong shape. In clinical use, the position of the spiral element can be adjusted according to the microwave frequency required to match the antenna size and microwave frequency, thus avoiding the problem of having to replace the ablation needle during ablation surgery due to adjusting the microwave frequency.

[0006] The specific technical solution adopted by this invention is as follows: An ablation needle includes a handle, an angle adjustment rod fixed to one end of the handle, a needle rod fixed to one end of the angle adjustment rod, and a needle tip fixed to one end of the needle rod. The angle adjustment rod, needle rod, and needle tip are internally interconnected. A water tank is fixed inside the handle. The water tank has an outlet chamber, an inlet chamber, and an adjustment chamber sequentially formed from one end to the other. The end of the angle adjustment rod near the water tank extends into the outlet chamber. A temperature sensor and a microwave connector are fixed to the end of the handle away from the angle adjustment rod. The microwave connector is configured to monitor the coolant temperature inside the outlet chamber. A coaxial cable is installed inside the handle and is fixedly connected to the temperature sensor. The coaxial cable includes an inner conductor, an insulating layer, and an outer conductor arranged coaxially from the inside to the outside. The ends of the inner conductor and the insulating layer away from the water tank extend into the needle tip. The end of the outer conductor away from the water tank extends into the needle rod. The needle needle also includes: An adjustment assembly is disposed inside the handle. The adjustment assembly includes an adjustment tube, a spiral element, and an adjustment button. The adjustment tube is slidably connected inside the water tank, and its two ends pass through both ends of the water tank. The spiral element is fixed to the end of the adjustment tube near the angle adjustment rod. The adjustment button is fixed to the outer end of the adjustment tube away from the spiral element, and the adjustment button is slidably connected to the handle. The adjustment button is configured to drive the spiral element and the device to synchronously switch between a first antenna state and a second antenna state. The first antenna state and the second antenna state are adapted to microwave frequencies of 2450MHz and 915MHz, respectively. A bending drive unit is assembled inside the handle and is configured to drive the angle adjustment rod to swing. Microwave energy is input into the coaxial cable, forming an ablation zone around the needle. The state of the spiral element is adjusted according to the microwave frequency, and the shape of the ablation zone can change between a teardrop shape and an oblong shape.

[0007] In a preferred embodiment, the adjusting assembly further includes a conductive ring and a conductive sleeve. The conductive ring is fixed inside the adjusting tube, and the conductive sleeve is fixed inside the conductive ring. The conductive sleeve and the outer conductor are slidably connected in a transition fit manner. The adjusting tube and the outer conductor are electrically connected through the conductive ring and the conductive sleeve. Sealing elements are bonded to both ends of the outer side of the conductive sleeve, and the sealing elements and the outer conductor are slidably connected in a transition fit manner. The interior of the adjusting tube can be sealed through the cooperation of the conductive ring, the conductive sleeve, and the outer conductor.

[0008] In a preferred embodiment, the distance between the end of the inner conductor away from the handle and the end of the adjustment tube away from the handle is denoted as L1. When the shape of the ablation zone is teardrop-shaped, L1 = 19 mm; when the shape of the ablation zone is oblong-shaped, L1 = 46 mm.

[0009] In a preferred embodiment, when the ablation zone is teardrop-shaped, the microwave frequency is 2450MHz; when the ablation zone is oblong-shaped, the microwave frequency is 915MHz.

[0010] In a preferred embodiment, the needle bar is made of any one of the following materials: second-wire stainless steel, 316 stainless steel, or titanium alloy; the needle tip is made of any one of the following materials: alumina, zirconium oxide, or silicon nitride; and the insulating layer is made of any one of the following materials: PTFE or PFA.

[0011] In a preferred embodiment, the bending drive unit includes a fixing block, a bending key, a first pull cable, and a second pull cable. The fixing block is fixed inside the handle, and the bending key is rotatably connected inside the handle. The first pull cable and the second pull cable are both slidably connected inside the fixing block and are located on both sides inside the angle adjustment rod, respectively. One end of the first pull cable and the angle adjustment rod, and one end of the second pull cable and the angle adjustment rod are both fixedly connected. The other end of the first pull cable and the bending key, and the other end of the second pull cable and the bending key are both fixedly connected.

[0012] In a preferred embodiment, in the initial state, the angle adjustment rod is in the shape of a straight line. When the bending key rotates in the forward direction, the bending key winds the first pull wire and causes the angle adjustment rod to bend to one side. When the bending key rotates in the reverse direction, the bending key winds the second pull wire and causes the angle adjustment rod to bend to the other side.

[0013] In a preferred embodiment, a cooling working fluid tube is fixed inside the water inlet chamber near one end of the angle adjustment rod and outside the adjustment tube, and one end of the cooling working fluid tube extends into the needle. A liquid supply passage is formed between the inner wall of the cooling working fluid tube and the outer wall of the adjustment tube, and a return flow passage is formed between the outer wall of the cooling working fluid tube and the inner wall of the angle adjustment rod, the inner wall of the needle rod, and the inner wall of the needle. The liquid supply passage and the return flow passage constitute a cooling channel.

[0014] In a preferred embodiment, the material of the cooling working fluid pipe is any one of the following materials: PI, PEEK, PA.

[0015] In a preferred embodiment, the end of the regulating chamber away from the outlet chamber is fixed with 121, and the coaxial cable is connected to 121. The handle is internally fixed with 122, which is configured to monitor the temperature of the coolant inside the outlet chamber.

[0016] The technical effects achieved by this invention are as follows: This invention delivers microwave energy to a coaxial cable 110, and the inner conductor 111 releases a microwave electromagnetic field, forming an ablation zone around the needle tip 103. The inner conductor 111 ablates the lesion tissue located within the ablation zone. During the ablation procedure, when it is necessary to change the ablation frequency, the adjustment button is pushed to move the spiral element 202, so that the position of the spiral element 202 matches the microwave frequency. By adjusting the position of the spiral element 202 and the microwave frequency, the shape of the ablation zone can be changed between a teardrop shape and an oblong shape, so that the device can adapt to microwaves of different frequencies and lesion tissues of different shapes. This avoids the problem of having to change the ablation needle when adjusting the microwave frequency during the ablation procedure, effectively improving the continuity and efficiency of the operation, and reducing the risk of infection and operational complexity caused by changing instruments. This invention allows the device to be wound around a first or second pull wire by rotating a bending key. This causes the first or second pull wire to bend the angle adjustment rod and swing the needle rod and needle tip, thereby adjusting the needle insertion angle. This makes the device suitable not only for large tumors but also for percutaneous puncture treatment of superficial tumors and small deep tumors. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the handle of the present invention; Figure 3 This is a cross-sectional view of the internal structure of the handle of the present invention; Figure 4 This is a cross-sectional view of the internal structure of the needle of the present invention; Figure 5 This is a schematic diagram of the internal structure of the needle tip of the present invention at a microwave frequency of 2450MHz; Figure 6 This is a schematic diagram of the internal structure of the needle tip of the present invention at a microwave frequency of 915MHz; Figure 7 This is an exploded view of the internal structure of the needle of the present invention; Figure 8 This is a partial structural schematic diagram of the regulating tube of the present invention; Figure 9 This is a cross-sectional view of the structure of the adjustment component of the present invention; Figure 10 This is a schematic diagram of the bending drive unit of the present invention; Figure 11 This is a schematic diagram of the angle adjustment rod of the present invention in a bent state; Figure 12This is a thermal field distribution diagram from the simulation test at a microwave frequency of 2450MHz in this invention; Figure 13 This is a thermal field distribution diagram from the simulation test at a microwave frequency of 915MHz in this invention.

[0018] The attached diagram lists the components represented by each number as follows: 100. Handle; 101. Angle adjustment rod; 102. Needle bar; 103. Needle tip; 104. Water tank; 105. Water outlet chamber; 106. Water inlet chamber; 107. Adjustment chamber; 108. Temperature sensor; 109. Microwave connector; 110. Coaxial cable; 111. Inner conductor; 112. Insulation layer; 113. Outer conductor; 120. Cooling fluid tube; 200. Adjustment components; 201. Adjusting tube; 202. Spiral element; 203. Adjusting button; 204. Conductive ring; 205. Conductive sleeve; 300. Bending drive unit; 301. Fixing block; 302. Bending key; 303. First pull wire; 304. Second pull wire. Detailed Implementation

[0019] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0020] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0021] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in a preferred embodiment" appearing in different places throughout this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that mutually excludes other embodiments.

[0022] Secondly, the present invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include the three-dimensional spatial dimensions of length, width, and depth.

[0023] Please see the appendix Figures 1 to 7As shown, this is the first embodiment of the present invention. This embodiment provides an ablation needle, including a handle 100. An angle adjustment rod 101 is fixed to one end of the handle 100. A needle rod 102 is fixed to one end of the angle adjustment rod 101, and a needle tip 103 is fixed to one end of the needle rod 102. The angle adjustment rod 101, the needle rod 102, and the needle tip 103 are internally interconnected. A water tank 104 is fixed inside the handle 100. The water tank 104 has an outlet chamber 105, an inlet chamber 106, and an adjustment chamber 107 sequentially opened from one end to the other. A temperature sensor 108 is fixed to the end of the adjustment chamber 107 away from the outlet chamber 105 and is coaxial with it. Cable 110 is connected to temperature sensor 108. A microwave connector 109 is fixed inside the handle 100. The microwave connector 109 is configured to monitor the coolant temperature inside the outlet chamber 105. An angle adjustment lever 101 extends from one end near the water tank 104 into the outlet chamber 105. A coaxial cable 110 is installed inside the handle 100. The coaxial cable 110 includes an inner conductor 111, an insulation layer 112, and an outer conductor 113 arranged coaxially from the inside to the outside. One end of the inner conductor 111 and the insulation layer 112 extends into the needle tip 103, and one end of the outer conductor 113 extends into the needle bar 102. It also includes: An adjustment assembly 200 is disposed inside the handle 100. The adjustment assembly 200 includes an adjustment tube 201, a spiral element 202, and an adjustment button 203. The adjustment tube 201 is slidably connected to the inside of the water tank 104, and both ends of the adjustment tube 201 pass through both ends of the water tank 104. The spiral element 202 is fixed to one end of the adjustment tube 201 near the angle adjustment rod 101. The adjustment button 203 is fixed to the outside of the adjustment tube 201 away from the spiral element 202, and the adjustment button 203 is slidably connected to the handle 100. The adjustment button 203 is configured to drive the spiral element 202 and the device to synchronously switch between a first antenna state and a second antenna state. The first antenna state and the second antenna state are respectively adapted to microwave frequencies of 2450MHz and 915MHz. The bending drive unit 300 is installed inside the handle 100 and is configured to drive the angle adjustment rod 101 to swing. When microwave energy is input into the coaxial cable 110, the inner conductor 111 releases a microwave electromagnetic field and forms an ablation region around the needle tip 103. The position of the spiral element 202 (i.e. the state of the spiral element 202) is adjusted according to the microwave frequency, and the shape of the ablation region can change between a teardrop shape and an oblong shape.

[0024] It should be noted that an ablation control terminal is also used in conjunction with the device. The ablation control terminal and the microwave connector 109 are electrically connected by wires. The ablation control terminal can deliver 915MHz or 2450MHz microwave energy to the inner conductor 111 through the microwave connector 109.

[0025] Furthermore, the needle bar 102 is made of any one of the following materials: 304 stainless steel, 316 stainless steel, or titanium alloy for the second pull wire; the needle tip 103 is made of any one of the following materials: alumina, zirconium oxide, or silicon nitride; and the insulating layer 112 is made of any one of the following materials: PTFE, PFA, or other highly insulating materials. In this embodiment, the needle bar 102 is preferably made of titanium alloy, the needle tip 103 is preferably made of zirconium oxide, and the insulating layer 112 is preferably made of PTFE.

[0026] Specifically, guide slots are provided on one side of the outer side of the adjustment chamber 107 and on one side of the handle 100. The adjustment button 203 extends through the two guide slots to the outer side of the handle 100. The adjustment button 203 and the handle 100 are slidably connected through the guide slots.

[0027] In this embodiment, before ablation of the lesion tissue in the patient's body, the location and size of the lesion are obtained using a laparoscope, thoracoscope, or / and other imaging equipment. The bending drive unit 300 is operated, which drives the angle adjustment rod 101 to bend and causes the needle rod 102 and needle tip 103 to swing, adjusting the insertion angle of the device. The handle 100 is held to insert the needle tip 103 into the lesion tissue. The ablation control terminal is activated to deliver microwave energy to the coaxial cable 110. The inner conductor 111 releases a microwave electromagnetic field and forms an ablation zone around the needle tip 103. The inner conductor 111 ablates the lesion tissue located within the ablation zone. During the ablation procedure, if it is necessary to change the ablation frequency (i.e., microwave frequency), the adjustment button is pushed. 203. Since the adjustment button 203 and the adjustment tube 201, as well as the adjustment tube 201 and the spiral element 202 are all fixedly connected, the adjustment button 203 drives the adjustment tube 201 and the spiral element 202 to move synchronously to the appropriate position, so that the device and the spiral element 202 change synchronously between the first antenna state and the second antenna state. In this way, the spiral element 202 can be adapted to microwaves of different frequencies in the first antenna state and the second antenna state. By adjusting the position of the spiral element 202 and the frequency of the microwave, the shape of the ablation area can be changed between a teardrop shape or an oblong shape, so as to adapt to lesion tissues of different shapes. After the ablation is completed, the needle 103 can be removed from the patient's body by holding the handle 100.

[0028] Here, during the process of adjusting the position of the spiral element 202 by adjusting the button 203, the spiral element 202 will not deform or compress, and its shape can always remain consistent with the initial shape.

[0029] Please see the appendix Figures 8 to 9 As shown, the adjustment assembly 200 also includes a conductive ring 204 and a conductive sleeve 205. The conductive ring 204 is fixed inside the adjustment tube 201, and the conductive sleeve 205 is fixed inside the conductive ring 204. The conductive sleeve 205 and the outer conductor 113 are slidably connected in a transition fit manner, and the adjustment tube 201 and the outer conductor 113 are electrically connected through the conductive ring 204 and the conductive sleeve 205.

[0030] Furthermore, sealing elements (not shown in the figure) are bonded to both ends of the outer side of the conductive sleeve 205, and the sealing elements and the outer conductor 113 are slidably connected in a transition fit. The sealing elements are made of silicone, and the interior of the regulating tube 201 can always be sealed through the cooperation of the conductive ring 204, the conductive sleeve 205 and the outer conductor 113.

[0031] It should be noted that the regulating tube 201, conductive ring 204 and conductive sleeve 205 are made of any one of the following materials: copper, copper alloy or other conductive metals.

[0032] In this embodiment, the regulating tube 201 and the outer conductor 113, as well as the spiral element 202 and the outer conductor 113, can be electrically connected through the conductive ring 204 and the conductive sleeve 205. The position of the spiral element 202 is adjusted by the regulating tube 201 to match the impedance of the antenna, thereby broadening the antenna's operating frequency to 2450MHz and 915MHz respectively. This allows one ablation needle to adapt to two microwave frequency outputs of the host, enabling free selection according to the actual application scenario without the need to change different ablation needles due to changing the ablation frequency.

[0033] In a preferred embodiment, the distance between the end of the inner conductor 111 away from the handle 100 and the end of the adjusting tube 201 away from the handle 100 is denoted as L1. When the shape of the ablation zone is teardrop-shaped, L1 = 19 mm. At this time, the microwave frequency adapted to the spiral element 202 is 2450 MHz, and both the spiral element 202 and the device are in the first antenna state. When the shape of the ablation zone is oblong-shaped, L1 = 46 mm. At this time, the microwave frequency adapted to the spiral element 202 is 915 MHz, and both the spiral element 202 and the device are in the second antenna state.

[0034] Furthermore, in this embodiment, during the adjustment of the spiral element 202, the outer conductor 113 is always located inside the adjustment tube 201.

[0035] It should be noted that in this embodiment, the adjustment button 203 has only two positions (i.e., the first antenna state and the second antenna state), and stepless adjustment cannot be achieved. Similarly, the spiral element 202 has only two positions (i.e., the first antenna state and the second antenna state). The microwave frequency adapted to the first antenna state is 2450MHz, and the microwave frequency adapted to the second antenna state is 915MHz.

[0036] In this embodiment, guided by the imaging equipment, after the needle 103 is inserted into the lesion tissue, if the lesion tissue is roughly circular, the adjustment button 203 is pushed. The adjustment button 203 moves the adjustment tube 201 and the spiral element 202 closer to the angle adjustment rod 101, reducing the value of L1 until L1 is 19mm. The ablation control terminal is then activated, transmitting microwaves at a frequency of 2450MHz to the coaxial cable 110. The microwave electromagnetic field is released through the inner conductor 111, forming a teardrop-shaped ablation area around the needle 103, thereby ablating the roughly circular lesion tissue. If the lesion tissue is elongated, the adjustment button 203 is pushed, and the adjustment button 203 moves the adjustment tube 201 and the spiral element 202 closer to the angle adjustment rod 101, reducing the value of L1 until L1 is 19mm. The ablation control terminal is then activated, transmitting microwaves at a frequency of 2450MHz to the coaxial cable 110. The inner conductor 111 releases the microwave electromagnetic field, forming a teardrop-shaped ablation area around the needle 103, thereby ablating the roughly circular lesion tissue. The moving adjustment tube 201 and the spiral element 202 move away from the angle adjustment rod 101, increasing the value of L1 until L1 reaches 46mm. The ablation control terminal is then activated, transmitting microwaves at a frequency of 915MHz to the coaxial cable 110. The microwave electromagnetic field is released through the inner conductor 111, forming an elongated ablation area around the needle tip 103, thereby ablating the elongated lesion tissue. Through the above scheme, the device can simultaneously adapt to microwaves of different frequencies, thus enabling the ablation of lesion tissues of different shapes. This avoids the phenomenon of frequently changing ablation needles during the ablation procedure, effectively improving the continuity and efficiency of the operation, and reducing the risk of infection and operational complexity caused by changing instruments.

[0037] In one specific embodiment, the microwave power is set to 50W, the pitch of the regulating tube 201 is 1mm, and the number of turns is 18. The thermal field distribution of the device is simulated using simulation software. When L1 is 19mm and the microwave frequency is 2450MHz, the thermal field distribution is as follows: Figure 11 As shown, the ablation region is teardrop-shaped; when L1 is 46 mm and the microwave frequency is 915 MHz, the thermal field distribution is as follows. Figure 12 As shown, at this time, the shape of the ablation region is oblong.

[0038] Please see the appendix Figures 10 to 11As shown, the bending drive unit 300 includes a fixing block 301, a bending key 302, a first pull cable 303, and a second pull cable 304. The fixing block 301 is fixed inside the handle 100, and the bending key 302 is rotatably connected to the inside of the handle 100. The first pull cable 303 and the second pull cable 304 are both slidably connected inside the fixing block 301 and are located on both sides inside the angle adjustment rod 101, respectively. One end of the first pull cable 303 is connected to the angle adjustment rod 101, and one end of the second pull cable 304 is connected to the angle adjustment rod 101. All 01 are fixedly connected. The other end of the first pull wire 303 and the bending key 302, as well as the other end of the second pull wire 304 and the bending key 302, are fixedly connected. In the initial state, the angle adjustment rod 101 is in a straight line. When the bending key 302 rotates in the forward direction, it winds the first pull wire 303 and causes the angle adjustment rod 101 to bend to one side. When the bending key 302 rotates in the reverse direction, it winds the second pull wire 304 and causes the angle adjustment rod 101 to bend to the other side.

[0039] It should be noted that the angle adjustment rod 101 has a multi-layer structure, with internal braided and spring-loaded support structures. The outermost layer is a tubular structure made of flexible polymer material, which has good support, bending ability, and conveying properties. The end of the angle adjustment rod 101 near the needle bar 102 is provided with a joint ring or a flexible skeleton with slots. The slots (symmetrically arranged on both sides) allow this section to bend in a specific direction when under force, while ensuring the structural strength in other directions. The end of the first pull wire 303 away from the bending key 302 and the end of the second pull wire 304 away from the bending key 302 are respectively fixedly connected to the two slots. Specifically, the flexible skeleton is a mature existing application, and its specific structure and working method can be referred to the existing technology, which will not be elaborated further here.

[0040] In this implementation, please refer to Figure 11As shown, the location of the lesion is obtained through laparoscopy, thoracoscopy, or / and other imaging equipment. Moving the bending key 302 forward causes it to rotate clockwise. This rotation winds and pulls the first pull wire 303, causing it to move closer to the handle 100. The first pull wire 303 then causes the flexible skeleton inside the angle adjustment rod 101 to bend and deform to one side, thus bending the angle adjustment rod 101 and causing the needle bar 102 and needle tip 103 to swing to one side. Moving the bending key 302 in the opposite direction causes the... The bending key 302 rotates in the opposite direction, and the second pull wire 304 is wound and pulled by the reverse-rotating bending key 302, so that the bending key 302 drives the second pull wire 304 to move closer to the handle 100. The second pull wire 304 drives the flexible skeleton inside the angle adjustment rod 101 to bend and deform to the other side of the angle adjustment rod 101, thereby causing the angle adjustment rod 101 to bend and drive the needle bar 102 and the needle 103 to swing to the other side, so as to adjust the insertion angle of the needle 103. This allows the device to be suitable not only for large tumors, but also for percutaneous puncture treatment of superficial tumors and deep small tumors.

[0041] It should be noted that in the above embodiments, forward rotation, reverse rotation, swinging to one side and swinging to the other side are all used to distinguish the differences in the operating direction of the components and do not constitute a specific limitation.

[0042] Please see the appendix Figures 3 to 6 As shown, a cooling medium tube 120 is fixed inside the water inlet chamber 106 near one end of the angle adjustment rod 101 and outside the adjustment tube 201. One end of the cooling medium tube 120 extends into the needle 103. A liquid supply passage is formed between the inner wall of the cooling medium tube 120 and the outer wall of the adjustment tube 201. A return flow passage is formed between the outer wall of the cooling medium tube 120 and the inner wall of the angle adjustment rod 101, the inner wall of the needle rod 102, and the inner wall of the needle 103. The liquid supply passage and the return flow passage constitute a cooling channel.

[0043] Here, the material of the cooling working fluid tube 120 is any one of the following materials: PI, PEEK, PA or other biocompatible polymer materials. In this embodiment, the material of the cooling working fluid tube 120 is preferably PI.

[0044] Furthermore, both the lower ends of the outlet chamber 105 and the inlet chamber 106 are provided with water pipe connectors, and the water pipe connectors are connected to the ablation control terminal through pipelines. The cooling medium can be output from the inside of the ablation control terminal to the inside of the inlet chamber 106, and flow along the cooling channel to the inside of the outlet chamber 105, and finally flow back to the inside of the ablation control terminal. In this embodiment, the cooling medium is preferably physiological saline.

[0045] It should be noted that, due to the combination of the conductive ring 204, the conductive sleeve 205 and the outer conductor 113, the interior of the regulating tube 201 is always blocked, and the cooling medium cannot flow along the interior of the regulating tube 201 during the flow of the cooling medium inside the cooling channel.

[0046] In this embodiment, by setting up the above scheme, a cooling medium can be introduced into the needle 103 to cool the regulating tube 201 and avoid excessively high temperatures from burning normal tissue.

[0047] The working principle of this invention is as follows: Before ablation of the lesion tissue in the patient's body, the location and size of the lesion are obtained through laparoscopy, thoracoscopy, or / and other imaging equipment. The bending key 302 is activated, driving the angle adjustment rod 101 to bend via the bending drive unit 300, which in turn causes the needle rod 102 and needle tip 103 to swing, adjusting the insertion angle of the device. The handle 100 is then used to insert the needle tip 103 into the lesion tissue. Cooling medium is input into the water inlet chamber 106 through the ablation control terminal, causing the cooling medium to flow along the cooling channel. The ablation control terminal is activated to deliver microwave energy to the coaxial cable 110. The inner conductor 111 releases a microwave electromagnetic field, forming an ablation zone around the needle tip 103. The lesion tissue located within the ablation zone is ablated through the inner conductor 111. During the ablation procedure, the inner conductor 111 needs to be replaced. When ablation is performed, push the adjustment button 203. The adjustment button 203 will move the adjustment tube 201 and the spiral element 202 to the appropriate position synchronously, so that the device and the spiral element 202 can change synchronously between the first antenna state and the second antenna state. This allows the spiral element 202 to be adapted to microwaves of different frequencies in the first antenna state and the second antenna state. By adjusting the position of the spiral element 202 and the frequency of the microwave, the shape of the ablation area can be changed between a teardrop shape and an oblong shape, thus adapting to lesions of different shapes. After ablation is completed, adjust the position of the needle 103 and repeat the above steps until the lesion is completely ablated. After the lesion is completely ablated, hold the handle 100 and remove the needle 103 from the patient's body.

[0048] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described or explained in this invention are implemented according to conventional methods in the art unless otherwise specified or limited.

Claims

1. An ablation needle, characterized in that: The device includes a handle (100), one end of which is fixed with an angle adjustment rod (101), a needle bar (102), and a needle tip (103) in sequence from near to far. The angle adjustment rod (101), needle bar (102), and needle tip (103) are internally interconnected. A water tank (104) is fixed inside the handle (100). A coaxial cable (110) is installed inside the handle (100). The coaxial cable (110) includes an inner conductor (111), an insulation layer (112), and an outer conductor (113) arranged coaxially from the inside to the outside. One end of the inner conductor (111) and the insulation layer (112) extends into the inside of the needle tip (103), and one end of the outer conductor (113) extends into the inside of the needle bar (102). The device also includes: An adjustment assembly (200) is disposed inside a handle (100). The adjustment assembly (200) includes an adjustment tube (201), which is slidably connected to the inside of a water tank (104). Both ends of the adjustment tube (201) pass through both ends of the water tank (104). A spiral element (202) and an adjustment button (203) are fixed to both ends of the adjustment tube (201). The adjustment button (203) is slidably connected to the handle (100). The adjustment button (203) is configured to drive the spiral element (202) and the device to synchronously switch between a first antenna state and a second antenna state. The first antenna state and the second antenna state are adapted to different microwave frequencies. Microwave energy is input into the coaxial cable (110), and an ablation zone is formed around the needle (103). The state of the spiral element (202) is adjusted according to the microwave frequency, and the shape of the ablation zone can change between a teardrop shape and an oblong shape.

2. The ablation needle according to claim 1, characterized in that: The adjustment assembly (200) further includes a conductive ring (204) and a conductive sleeve (205). The conductive ring (204) is fixed inside the adjustment tube (201), and the conductive sleeve (205) is fixed inside the conductive ring (204). The conductive sleeve (205) and the outer conductor (113) are slidably connected in a transition fit manner, and the adjustment tube (201) and the outer conductor (113) are electrically connected through the conductive ring (204) and the conductive sleeve (205).

3. The ablation needle according to claim 1, characterized in that: The distance between the end of the inner conductor (111) away from the handle (100) and the end of the adjusting tube (201) away from the handle (100) is denoted as L1. When the shape of the ablation zone is teardrop, L1 = 19 mm; when the shape of the ablation zone is oblong, L1 = 46 mm.

4. The ablation needle according to claim 1, characterized in that: When the ablation zone is teardrop-shaped, the microwave frequency is 2450MHz; when the ablation zone is oblong-shaped, the microwave frequency is 915MHz.

5. An ablation needle according to claim 1, characterized in that: The needle bar (102) is made of any one of the following materials: second pull wire (304) stainless steel, 316 stainless steel, titanium alloy, and the needle tip (103) is made of any one of the following materials: alumina, zirconium oxide, silicon nitride.

6. An ablation needle according to claim 1, characterized in that: The handle (100) is internally equipped with a bending drive unit (300). The bending drive unit (300) includes a fixing block (301), a bending key (302), a first pull wire (303), and a second pull wire (304). The fixing block (301) is fixed inside the handle (100). The bending key (302) is rotatably connected inside the handle (100). The first pull wire (303) and the second pull wire (304) are both slidably connected inside the fixing block (301) and are located on both sides inside the angle adjustment rod (101). One end of the first pull wire (303) and the angle adjustment rod (101) and one end of the second pull wire (304) and the angle adjustment rod (101) are both fixedly connected. The other end of the first pull wire (303) and the bending key (302) and the other end of the second pull wire (304) and the bending key (302) are both fixedly connected.

7. An ablation needle according to claim 6, characterized in that: In the initial state, the angle adjustment rod (101) is in the shape of a straight line. When the bending key (302) rotates in the forward direction, the bending key (302) winds the first pull wire (303) and causes the angle adjustment rod (101) to bend to one side. When the bending key (302) rotates in the reverse direction, the bending key (302) winds the second pull wire (304) and causes the angle adjustment rod (101) to bend to the other side.

8. An ablation needle according to claim 1, characterized in that: The water tank (104) has an outlet chamber (105), an inlet chamber (106), and an adjustment chamber (107) sequentially arranged from one end to the other. The angle adjustment rod (101) extends from one end near the water tank (104) into the outlet chamber (105). A cooling medium tube (120) is fixed at one end of the inlet chamber (106) and outside the adjustment tube (201). One end of the cooling medium tube (120) extends into the needle (103). A liquid supply passage is formed between the inner wall of the cooling medium tube (120) and the outer wall of the adjustment tube (201). A return flow passage is formed between the outer wall of the cooling medium tube (120) and the inner wall of the angle adjustment rod (101), the inner wall of the needle rod (102), and the inner wall of the needle (103). The liquid supply passage and the return flow passage constitute a cooling channel.

9. An ablation needle according to claim 8, characterized in that: The material of the cooling working fluid pipe (120) is any one of the following materials: PI, PEEK, PA.

10. An ablation needle according to claim 1, characterized in that: A temperature sensor (108) and a microwave connector (109) are fixed inside the handle (100) at one end away from the angle adjustment rod (101), and the coaxial cable (110) is connected to the temperature sensor (108). The microwave connector (109) is configured to monitor the temperature of the coolant inside the water outlet chamber (105).

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