A percutaneously punctured bipolar ablation device

Abstract

The utility model belongs to the medical instrument pulse ablation technical field especially points to a kind of bipolar ablation device of percutaneous puncture, including needle tube, it is equipped with first insulating layer thereon, the distal end portion of needle tube is exposed to form first ablation electrode;Needle core is set in needle tube, needle core is rigid structure and / or needle tube is rigid structure, needle core and needle tube coaxially are arranged, second ablation electrode is equipped on the needle core, needle core and needle tube can move synchronously, and needle core and needle tube can be relatively moved, when second ablation electrode extends needle tube, second ablation electrode and first ablation electrode between are equipped with preset interval, preset interval is adjustable, wherein, puncture cutting edge is arranged at the distal end of needle tube or puncture cutting edge is arranged at the distal end of needle core. By adopting the above structure, while ensuring that extracorporeal puncture path is not deviated, preset interval can also be adjusted according to the size of lesion tissue, so that one-time ablation of larger tissue is realized, and ablation efficiency is improved.

Description

Technical Field

[0001] This utility model belongs to the field of pulse ablation technology for medical devices, and specifically refers to a percutaneous bipolar ablation device. Background Technology

[0002] Pulsed electric field ablation technology is applied clinically based on the electroporation effect of pulsed electric fields. Data shows that electroporation is divided into reversible and irreversible electroporation. Irreversible electroporation refers to a stronger electric field causing permanent permeability of the cell membrane, leading to cell death.

[0003] Based on the theory of reversible electroporation, clinicians use high-intensity electrical pulses to allow drugs that are difficult to penetrate the lipid bilayer membrane to easily enter cells through the tiny pores of the cell membrane, thereby improving efficacy. This method not only reduces the dosage of drugs used but also reduces certain toxic side effects due to the reduced dosage. This therapy is called electrochemical therapy and is currently mainly used for diseases such as cancer. Another medical application of reversible electroporation is the introduction of genes into cells or tissues for gene therapy and DNA vaccination.

[0004] Among existing ablation devices, most have a fixed ablation area and a simple structural design, which leads to several pain points during operation. On the one hand, the length of the ablation electrode in currently available products is fixed, resulting in a small ablation range for tumors in a single operation. For larger tumors or tumors with irregular shapes, multiple ablation operations are required to achieve complete coverage. Multiple ablation operations require multiple punctures into the body, and may damage surrounding normal tissues during the ablation process, causing unnecessary harm.

[0005] Current patent applications addressing this issue typically control the length of the ablation electrode by moving the outer sheath. This inevitably creates a physical gap between the outer sheath and the electrode. Firstly, conductive fluids like blood can fill the outer sheath, leading to errors in the effective ablation length. Secondly, if the fluid reaches the handle along the outer sheath, it could cause accidental injury to the operator. Furthermore, the gap between the outer sheath and the needle electrode can cause deformation or eversion during tissue advancement, reducing puncture force and potentially causing tissue damage.

[0006] On the other hand, due to the irregular distribution of blood vessels in the human body, doctors need to avoid blood vessels during the procedure to prevent the needle tip from puncturing them and causing bleeding. However, if it is impossible to avoid blood vessels after the planned puncture path is confirmed, a blunt-tipped needle is needed to first open the blood vessel before puncture. This achieves minimally invasive treatment, reduces the occurrence of complications, and improves patient comfort. Simultaneously, during the puncture process, the tumor's position changes constantly with respiration, making it difficult to insert the needle into the designated location of the tumor in one go. The operator needs to perform multiple repeated needle insertion and withdrawal operations under CT guidance. To solve this problem, the current clinical approach generally uses a blunt-tipped ablation needle equipped with a coaxial needle with a cutting edge. This method avoids the risk of blood vessel puncture, but it requires making the ablation needle thicker, resulting in greater trauma to the body and increasing the difficulty for the operator. Utility Model Content

[0007] This invention provides a percutaneous bipolar ablation structure to solve the problem in the above-mentioned technical background that existing ablation devices cannot achieve one-time ablation when the lesion tissue is too large.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A percutaneous bipolar ablation device includes:

[0010] A needle tube has a distal end and a proximal end, and a first insulating layer is provided on the needle tube. The distal end of the needle tube is exposed to form a first ablation electrode.

[0011] The needle core has a distal end and a proximal end, and is disposed inside the needle tube. The needle core is a rigid structure and / or the needle tube is a rigid structure. The needle core and the needle tube are coaxially arranged. A second ablation electrode is provided at the distal end of the needle core. The needle core and the needle tube can move synchronously and can move relative to each other so that the second ablation electrode can extend out of or be housed in the needle tube. When the second ablation electrode extends out of the needle tube, a preset distance is provided between the second ablation electrode and the first ablation electrode. The preset distance is adjustable.

[0012] Specifically, a puncture incision is provided at the distal end of the needle tube, or the puncture incision is provided at the distal end of the needle core.

[0013] In some embodiments, the second ablation electrode is integrally formed with the needle core, the needle core having a second insulating layer, and the distal portion of the needle core being exposed to form the second ablation electrode.

[0014] In some embodiments, when the distal end of the needle tube is provided with a puncture cutting edge, the distal end of the needle core is provided with a smooth guide structure; or when the puncture cutting edge is located at the distal end of the needle core, the smooth guide structure is located at the distal end of the needle tube.

[0015] In some embodiments, a control handle is also included. The control handle includes a first fixed rod, a first housing, and a second housing arranged coaxially. The first housing is movably sleeved on one end of the first fixed rod, and the second housing is movably sleeved on the other end of the first fixed rod. The needle tube is connected to the first housing. The first fixed rod is provided with a first channel, and one end of the needle core passes through the first channel and is connected to the second housing.

[0016] In some embodiments, the first fixing rod is provided with a gripping position, which divides the first fixing rod into a first segment and a second segment. The first housing is movably inserted through the first segment of the first fixing rod, and the second housing is movably inserted through the second segment of the first fixing rod. Both the first housing and the second housing can abut against the gripping position.

[0017] In some embodiments, the first housing is provided with a first threaded hole, the first threaded hole is provided with a first locking knob, the first section of the first fixing rod is provided with a first locking plane, one end of the first locking knob can abut against or disengage from the first locking plane, the first locking plane is provided with a first scale mark, and one end of the first housing can coincide with the first scale mark.

[0018] In some embodiments, a first limiting structure is provided between the first housing and the first fixing rod. The first limiting structure includes a first limiting boss disposed on the first housing and a first limiting groove disposed on the first fixing rod; or a first limiting groove disposed on the first housing and a first limiting boss disposed on the first fixing rod, wherein the first limiting boss is movably inserted into the first limiting groove, and the distribution direction of the first limiting groove is consistent with the axial direction of the first fixing rod.

[0019] In some embodiments, a second limiting structure is provided between the first housing and the first fixing rod. The second limiting structure includes a second limiting groove disposed on the first fixing rod and a matching second limiting boss disposed on the first housing. The second limiting boss can engage with or disengage from the second limiting groove.

[0020] In some embodiments, the first housing is provided with a first slot, and the first slot is provided with a matching first seat, and one end of the needle tube is fixedly connected to the first seat.

[0021] In some embodiments, the first housing and the second housing have the same structure, and the second housing is provided with a first electrode wire and a second electrode wire. The first electrode wire is electrically connected to the needle tube, and the second electrode wire is electrically connected to the needle core.

[0022] Compared with the prior art, the beneficial effects of this utility model are:

[0023] This application sets a needle core inside the needle tube, sets a first ablation electrode at the distal end of the needle tube, and sets a second ablation electrode at the distal end of the needle core. Through the relative movement of the needle tube and the needle core, the second ablation electrode is moved out of the needle tube, forming an adjustable preset distance between it and the first ablation electrode. The preset distance is adjusted according to the size of the lesion tissue, thereby achieving one-time ablation of larger lesion tissue.

[0024] Additional aspects and advantages of this application will be set forth in part in the description which follows, and will become apparent from the description or may be learned by practice of this application. Attached Figure Description

[0025] Figure 1 This is a three-dimensional schematic diagram of a percutaneous bipolar ablation device according to the present invention;

[0026] Figure 2 This is an enlarged schematic diagram of the distal end of the needle tube of a percutaneous bipolar ablation device according to this utility model.

[0027] Figure 3 for Figure 2 Another variation of the diagram;

[0028] Figure 4 This is a cross-sectional view of the control handle of a percutaneous bipolar ablation device according to this utility model;

[0029] Figure 5 for Figure 4 Enlarged view of point A in the middle;

[0030] Figure 6 This is a first exploded schematic diagram of the control handle of a percutaneous bipolar ablation device according to the present invention;

[0031] Figure 7 This is a second exploded schematic diagram of the control handle of a percutaneous bipolar ablation device according to this utility model;

[0032] Figure 8 This is a cross-sectional view of a percutaneous bipolar ablation device of the present invention at the first locking knob;

[0033] Figure 9 for Figure 6 Enlarged view at point B in the middle;

[0034] Figure 10 for Figure 7 Enlarged view at point C;

[0035] Figure 11 This is a schematic diagram of the operation of a percutaneous bipolar ablation device according to the present invention. Detailed Implementation

[0036] The present application will be further described in detail below with reference to the accompanying drawings. In the description of the embodiments, unless otherwise stated, the terms "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and are not intended to indicate or imply that the present application must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present application.

[0037] like Figure 1 and Figure 2 As shown, this utility model provides a percutaneous unipolar ablation device, which mainly includes a needle tube 102 and a needle core 202. The needle tube 102 and the needle core 202 can move relative to each other so that the needle core 202 can be received or extended from the needle tube 102.

[0038] Specifically, the needle 102 has a distal end and a proximal end, as in this embodiment, such as Figure 1 As shown, the left side is the distal end of the needle tube 102, and the right side is the proximal end. A first insulating layer 1021 is disposed on the needle tube 102, covering the distal end of the needle tube 102. The exposed portion at the distal end of the needle tube 102 forms a first ablation electrode 1022 capable of ablation discharge. The first ablation electrode 1022 can be configured with external ablation energy. In this embodiment, the first insulating layer 1021 can be a material such as a pyrene coating or polyimide. The first insulating layer 1021 is fixedly disposed on the needle tube 102 and cannot move relative to the needle tube 102.

[0039] The needle core 202 is movably inserted into the needle tube 102. One end of the needle core 202 can be inserted or stored in the needle tube 102. The distal end of the needle core 202 is provided with a second ablation electrode 2022. The polarities of the first ablation electrode 1022 and the second ablation electrode 2022 are opposite, thereby forming a bipolar ablation structure. In this embodiment, the second ablation electrode 2022 and the needle core 202 are integrally constructed. The needle core 202 is made of conductive material, and a second insulating layer 2021 is provided on the outer wall of the needle core 202. The second insulating layer 2021 of the needle core 202 is laid and covered from the proximal end to the distal end of the needle core 202, with the distal part of the needle core 202 exposed to form the second ablation electrode 2022. The other end of the needle core 202 extends out of the proximal end of the needle tube 102. When the second ablation electrode 2022 extends out of the needle tube 102, a preset distance L is provided between the second ablation electrode 2022 and the first ablation electrode 1022. The preset distance L is adjustable and can be adjusted by the relative movement of the needle core 202 and the needle tube 102. The preset distance L is adaptively matched and adjusted according to the size of the lesion tissue, thereby realizing the ablation of larger lesion tissue. At the same time, the bipolar ablation structure circuit segment has low energy loss and high ablation efficiency.

[0040] Since this application is an external puncture structure, in order to ensure that it has puncture capability and can reach the lesion, in this embodiment, both the needle core 202 and the needle tube 102 are set as rigid structures, the needle core 202 and the needle tube 102 are set as coaxial lines, and a puncture blade 1023 is set at the distal end of the needle tube 102, or a puncture blade 1023 is set at the distal end of the needle core 202. By setting the needle core 202 and the needle tube 102 as described above, it can be effectively ensured that the needle core 202 and the needle tube 102 enter the human body through external puncture and will not deviate from the preset puncture direction.

[0041] Alternatively, only the needle tube 102 can be configured as a rigid structure, or only the needle core 202 can be configured as a rigid structure. Since the needle core 202 is movably inserted into the needle tube 102, it can also be ensured that it will not deviate from the preset puncture direction during the puncture process.

[0042] It should be noted that, to ensure the puncture capability of the ablation device, in this embodiment, a puncture blade 1023 is provided at the distal end of the needle tube 102. Puncture and cutting are performed through the puncture blade 1023, allowing the first ablation electrode 1022 to reach the lesion. Simultaneously, to avoid puncturing or damaging blood vessels during puncture, a smooth guide structure 2023 is provided at the distal end of the needle core 202. The distal end of the needle core 2021 is... Figure 2 As shown on the left side, the smooth guide structure 2023 pushes the blood vessel open and away from the preset puncture path. In this embodiment, as... Figure 2As shown, the smooth guide structure 2023 is an arc-shaped structure, that is, a rounded corner is provided at the distal end of the needle core 202. As a modified implementation, the smooth guide structure 2023 can also be a chamfered structure, that is, a sloped structure, or a combination of an arc-shaped structure and a sloped structure, which can also form the above-mentioned smooth guide structure 2023. In this embodiment, the purpose of the smooth guide structure 2023 is to open up blood vessels and other tissues, and it does not have the ability to puncture or cut.

[0043] As another modified embodiment, such as Figure 3 As shown, the puncture edge 1023 can also be located at the distal end of the needle core 202, and the smooth guide structure 2023 can be located at the distal end of the needle tube 102.

[0044] In specific operations, when it is as follows Figure 2 In the structure shown, in the initial state, the needle core 202 is housed within the needle tube 102, as referenced. Figure 11 The needle core 202 and the needle tube 102 move synchronously in the direction A1. When a blood vessel is encountered during puncture, the first housing 100 is moved in the direction A2 or the second housing 200 is moved in the direction A3, pushing the distal end of the needle core 202 out of the distal end of the needle tube 102. This is achieved by the smooth guide structure 2023 at the distal end of the needle core 202, which then pushes it open. Then the needle tube 102... Figure 2 Move the needle in the leftward direction as shown, keeping the needle core 202 stationary. Store the needle core 202 inside the needle tube 102 and continue puncturing until the lesion tissue is reached. When the lesion tissue is too large, because the effective ablation length of the first ablation electrode 1022 is relatively short, the electric field cannot cover the entire lesion tissue. In this case, continue puncturing and pushing the needle tube 102 to the edge of the lesion, and then move the needle tube 102 towards... Figure 2 The device moves to the right, increasing the preset distance L between the first ablation electrode 1022 and the second ablation electrode 2022. This increases the effective ablation range and ablation area of ​​the entire ablation device, thus enabling the ablation of larger lesions. Compared to existing ablation methods, this process eliminates the need for repeated punctures, reducing surgical difficulty, improving the patient's treatment experience, saving time, and increasing ablation efficiency.

[0045] When it is as follows Figure 3 In the structure shown, during the puncture process, the distal end of the needle core 202 needs to extend beyond the distal end of the needle tube 102. When a blood vessel is encountered during the puncture, the needle core 202 then... Figure 3 Move to the right in the direction shown or towards the needle 102 Figure 3The needle is moved to the left in the indicated direction so that the needle core 202 is housed within the needle tube 102. When the blood vessel is opened by the smooth guide structure 2023 at the distal end of the needle tube 102, the needle core 202 continues to extend out of the needle tube 102 for puncture. Similarly, when the lesion is large, the needle core 202 is pushed to the edge of the lesion, and the needle tube 102 is moved towards... Figure 3 As shown, the ablation range is increased by increasing the preset spacing L, thereby increasing the coverage area of ​​the electric field and completing the ablation of larger lesions.

[0046] In one embodiment, to facilitate the movement control of the needle tube 102 and the needle core 202, a control handle connected to the needle core 202 and the needle tube 102 is also included. Specifically, the control handle includes a first fixing rod 300, a first housing 100, and a second housing 200 arranged coaxially. The first housing 100 is movably sleeved on one end of the first fixing rod 300, and the second housing 200 is movably sleeved on the other end of the first fixing rod 300. The first housing 100 can reciprocate linearly relative to the axial direction of the first fixing rod 300, and the second housing 200 can reciprocate linearly along the axial direction of the first fixing rod 300. The proximal end of the needle tube 102 is fixedly connected to the first housing 100, and the proximal end of the needle core 202 extends out of the proximal end of the needle tube 102 and is fixedly connected to the second housing 200.

[0047] Furthermore, to facilitate the setting and movement of the needle core 202, such as Figure 4 As shown, a through channel is provided on the first fixing rod 300. The proximal end of the needle core 202 extends out of the proximal end of the needle tube 102 and passes through the first channel to connect with the second housing 200. In this embodiment, the needle core 202 and the first fixing rod 300 are arranged coaxially, thereby facilitating the second housing 200 to drive the needle core to move relative to the first fixing rod 300.

[0048] In one embodiment, to facilitate operation of the device by the surgeon during ablation, a gripping position 303 is provided on the first fixing rod 300, which divides the first fixing rod 300 into a first segment 301 and a second segment 302, such as... Figure 4 As shown, the first housing 100 is movably inserted through the first segment 301, and the second housing 200 is movably inserted through the second segment 302. Specifically, the gripping position 303 has a preset length, and the outer diameter of the gripping position 303 is larger than the outer diameter of the first segment 301 and the second segment 302. During operation, the surgeon holds the gripping position 303 with one hand and operates the first housing 100 or the second housing 200 with the other hand. In this embodiment, both the first housing 100 and the second housing 200 can abut against the gripping position 303, thereby limiting the movement of the first housing 100 and the second housing 200 and preventing them from moving beyond their travel range.

[0049] In this embodiment, for ease of assembly, the first segment 301 of the first fixing rod 300 is detachably connected to the gripping position 303, and the two are locked together by a threaded engagement. Optionally, the second segment 302 of the first fixing rod 300 can also be detachably connected to the gripping position 303, or the first segment 301, the second segment 302, and the gripping position 303 can be integrally constructed.

[0050] In one embodiment, since the relative position of the first housing 100 with respect to the first fixing rod 300 needs to be fixed during operation, such as... Figure 6 , Figure 7 as well as Figure 9 As shown, a first threaded hole 106 is provided on the first housing 100, and a first locking knob 101 is provided on the first threaded hole 106. By rotating the first locking knob 101, one end of the first locking knob 101 can abut against or disengage from the first fixing rod 300. When the first locking knob 101 abuts against the first fixing rod 300, the position of the first housing 100 relative to the first fixing rod 300 is fixed. At this time, the position of the needle tube 102 relative to the first fixing rod 300 is fixed. When the first locking knob 101 disengages from the first fixing rod 300, the first housing 100 can move relative to the first fixing rod 300. At this time, the needle tube 102 can move relative to the first fixing rod 300.

[0051] Furthermore, to make the locking structure more stable, the contact surfaces of the first locking knob 101 and the first segment 301 of the first fixing rod 300 are both planar structures, such as... Figure 9 As shown, a first locking plane 3011 is provided on the first section 301 of the first fixing rod 300, thereby increasing the contact surface between the first locking knob 101 and the first fixing rod 300, making the locking structure of the first housing 100 relative to the first fixing rod 300 more stable.

[0052] Furthermore, in order to facilitate precise control of the movement length of the needle tube 102 relative to the needle core 202, a first scale mark 3012 is set on the first locking plane 3011. The end of the first housing 100 near the grip position can be aligned with the first scale mark 3012. The movement distance of the needle tube 102 relative to the needle core 202 is determined by the corresponding number on the first scale mark 3012, thereby achieving precise control of the effective ablation length of the ablation device.

[0053] In one embodiment, such as Figure 8 , Figure 9 as well as Figure 10As shown, a first limiting structure is provided between the first housing 100 and the first fixed rod 300. The first limiting structure includes a first limiting boss 105 disposed on the first housing 100 and a first limiting groove 3015 disposed on the first fixed rod 300. The first limiting boss 105 is adapted to the first limiting groove 3015 and is engaged in the first limiting groove 3015. In this embodiment, the length of the first limiting groove 3015 is consistent with the length of the first segment 301. The length direction of the first limiting groove 3015 and the length direction of the first limiting boss 105 are both consistent with the axial direction of the first fixed rod 300, thereby ensuring that the first housing 100 only reciprocates linearly relative to the first fixed rod 300.

[0054] Alternatively, as another variation of this embodiment, the first limiting boss 105 can be disposed on the first segment 301 of the first fixing rod 300, and the first limiting groove 3015 can be disposed on the first housing 100. In this case, the length of the first limiting boss 105 is consistent with the length of the first segment 301.

[0055] Alternatively, the cross section of the first fixed rod 300 can be set as a non-cylindrical structure. For example, the cross section of the first segment 301 of the first fixed rod 300 can be triangular, rectangular, or elliptical, etc., which can also achieve the reciprocating linear movement of the first housing 100 relative to the first fixed rod 300.

[0056] In one embodiment, such as Figure 8 and Figure 9 As shown, a second limiting structure is provided between the first housing 100 and the first fixing rod 300. The second limiting structure includes a second limiting groove 3014 disposed on the first fixing rod 300 and a second limiting boss 104 disposed on the first housing 100. The second limiting boss 104 can be engaged into the second limiting groove 3014. By providing the second limiting structure, it can be effectively ensured that the first housing 100 will not detach from the first fixing rod 300 when moving the needle tube 102. When the operator feels obvious resistance during the movement of the first housing 100, the second limiting boss 104 will engage into the second limiting groove 3014, and the first housing 100 will be in its extreme position, only able to move as shown in the diagram. Figure 4 The movement is shown in the rightward direction. Further, as... Figure 5 As shown, the surface of the second limiting boss 104 is an arc-shaped structure, and the boss on the side of the second limiting groove 3014 near the gripping position 303 is also an arc-shaped structure, thereby reducing the resistance when the second limiting boss 104 engages with or disengages from the second limiting groove 3014.

[0057] In one embodiment, to facilitate the connection between the needle tube 102 and the first housing 100, a first slot 103 is provided in the first housing 100, and a matching first retainer 1031 is provided in the first slot 103. The proximal end of the needle tube 102 is fixedly connected to the first retainer 1031, thereby realizing a detachable connection between the needle tube 102 and the first housing 100 and simplifying the assembly method between the two. Figure 6 and Figure 7 It can be seen that the first housing 100 and the second housing 200 are both composed of two half-housing units. The two half-housing units are fixed by a retaining ring 108 to form the first housing 100. The first retaining groove 103 is located on the two half-housing units respectively.

[0058] Refer again Figure 6 and Figure 7 The second housing 200 has a second threaded hole 206, and a second locking knob 201 is provided on the second threaded hole 206. The second section 302 of the first fixing rod 300 has a second locking plane 3011, and one end of the second locking knob 201 can abut against or disengage from the second locking plane 3011. Furthermore, the second locking plane 3011 has a second scale mark 3012, and one end of the second housing 200 can coincide with the second scale mark 3012. Its principle and structure are the same as those of the first housing 100, and will not be described in detail here.

[0059] In one embodiment, a third limiting structure is provided between the second housing 200 and the first fixing rod 300. The third limiting structure includes a third limiting boss 205 disposed on the second housing 200 and a third limiting groove 3025 disposed on the first fixing rod 300. The third limiting boss 205 is movably inserted into the third limiting groove 3025, and the distribution direction of the third limiting groove 3025 is consistent with the axial direction of the first fixing rod 300.

[0060] Optionally, the third limiting structure may also consist of a third limiting groove 3025 disposed on the second housing 200 and a third limiting boss 205 disposed on the first fixing rod 300. The principle and structure of the third limiting structure are the same as those of the first limiting structure, as described above.

[0061] In one embodiment, a fourth limiting structure is provided between the second housing 200 and the first fixing rod 300. The fourth limiting structure includes a fourth limiting groove 3024 disposed on the first fixing rod 300 and a matching fourth limiting boss 204 disposed on the second housing 200. The fourth limiting boss 204 can engage with or disengage from the fourth limiting groove 3024. The principle and structure of the fourth limiting structure are the same as those of the aforementioned second limiting structure, and will not be described in detail here.

[0062] In one embodiment, the second housing 200 is provided with a second slot 203, and the second slot 203 is provided with a matching second seat 2031. One end of the needle core 202 is fixedly connected to the second seat 2031. The second seat 2031 is also provided with a first cable 207, which includes a first electrode wire 2071 and a second electrode wire 2072. The first electrode wire 2071 passes through the first fixing rod 300 and is connected to the needle tube 102. Specifically, a through hole is provided on the first fixing rod 300, and the first electrode wire 2071 passes through the through hole to transmit external ablation energy to the first ablation electrode 1022 through the needle tube 102. The second electrode wire 2072 is electrically connected to the needle core 202 to transmit external ablation energy to the second ablation electrode 2022 through the needle core 202. The other end of the first electrode line 2071 is provided with a first plug 20711, and the other end of the second electrode line 2072 is provided with a second plug 20721. The first plug 20711 and the second plug 20721 are respectively connected to the positive and negative terminals of the energy generator.

[0063] In one embodiment, the present invention also provides an operating method for a percutaneous bipolar ablation device applied to the above embodiments, comprising the following steps:

[0064] like Figure 11 As shown, in the initial state, i.e., before the needle is inserted into the human body, both the first housing 100 and the second housing 200 are locked and fixed relative to the first fixing rod 300. With the assistance of CT or ultrasound imaging, the puncture path is confirmed, and the operator begins needle insertion. At this time, as... Figure 11 As shown in direction A1, the entire device is inserted to the target position. In the initial position, the needle core 202 is located inside the needle tube 102. When it is necessary to adjust the distance between the second ablation electrode 2022 and the first ablation electrode 1022, the following method is used.

[0065] Release the second locking knob 201, move the second housing 200 relative to the first fixing rod 300 in the A3 direction, and when it reaches the desired position, fix the second locking knob 201; or

[0066] Release the first locking knob 101, move the first housing 100 relative to the first fixing rod 300 in the A2 direction, and when it reaches the desired position, fix the first locking knob 101; or

[0067] During one adjustment process, the first housing 100 moves in the A2 direction and the second housing 200 moves in the A3 direction, thereby increasing the preset distance L between the first ablation electrode 1022 and the second ablation electrode 2022 to meet the ablation of larger lesion tissue.

[0068] The above description is merely a preferred embodiment of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model. These improvements and modifications should also be considered within the scope of protection of this utility model.

Claims

1. A percutaneous bipolar ablation device, characterized in that, include: A needle tube has a distal end and a proximal end, and a first insulating layer is provided on the needle tube. The distal end of the needle tube is exposed to form a first ablation electrode. The needle core has a distal end and a proximal end, and is disposed inside the needle tube. The needle core is a rigid structure and / or the needle tube is a rigid structure. The needle core and the needle tube are coaxially arranged. A second ablation electrode is provided at the distal end of the needle core. The needle core and the needle tube can move synchronously and can move relative to each other so that the second ablation electrode can extend out of or be housed in the needle tube. When the second ablation electrode extends out of the needle tube, a preset distance is provided between the second ablation electrode and the first ablation electrode. The preset distance is adjustable. Specifically, a puncture incision is provided at the distal end of the needle tube, or the puncture incision is provided at the distal end of the needle core.

2. The percutaneous bipolar ablation device according to claim 1, characterized in that, The second ablation electrode is integrally formed with the needle core, the needle core having a second insulating layer, and the distal portion of the needle core being exposed to form the second ablation electrode.

3. The percutaneous bipolar ablation device according to claim 2, characterized in that, When the distal end of the needle tube is provided with a puncture cutting edge, the distal end of the needle core is provided with a smooth guide structure; or when the puncture cutting edge is located at the distal end of the needle core, the smooth guide structure is located at the distal end of the needle tube.

4. A percutaneous bipolar ablation device according to any one of claims 1-3, characterized in that, It also includes a control handle, which includes a first fixed rod, a first housing, and a second housing arranged coaxially. The first housing is movably sleeved on one end of the first fixed rod, and the second housing is movably sleeved on the other end of the first fixed rod. The needle tube is connected to the first housing. The first fixed rod is provided with a first channel, and one end of the needle core passes through the first channel and is connected to the second housing.

5. The percutaneous bipolar ablation device according to claim 4, characterized in that, The first fixed rod is provided with a gripping position, which divides the first fixed rod into a first segment and a second segment. The first housing is movably inserted through the first segment of the first fixed rod, and the second housing is movably inserted through the second segment of the first fixed rod. Both the first housing and the second housing can abut against the gripping position.

6. The percutaneous bipolar ablation device according to claim 4, characterized in that, The first housing is provided with a first threaded hole, the first threaded hole is provided with a first locking knob, the first section of the first fixing rod is provided with a first locking plane, one end of the first locking knob can abut against or disengage from the first locking plane, the first locking plane is provided with a first scale mark, and one end of the first housing can coincide with the first scale mark.

7. A percutaneous bipolar ablation device according to claim 4, characterized in that, A first limiting structure is provided between the first housing and the first fixing rod. The first limiting structure includes a first limiting boss and a first limiting groove on the first housing; or a first limiting groove and a first limiting boss on the first fixing rod. The first limiting boss is movably inserted into the first limiting groove, and the distribution direction of the first limiting groove is consistent with the axial direction of the first fixing rod.

8. A percutaneous bipolar ablation device according to claim 4, characterized in that, A second limiting structure is provided between the first housing and the first fixing rod. The second limiting structure includes a second limiting groove provided on the first fixing rod and a matching second limiting boss provided on the first housing. The second limiting boss can engage with or disengage from the second limiting groove.

9. A percutaneous bipolar ablation device according to claim 4, characterized in that, The first housing has a first slot, and the first slot has a matching first seat. One end of the needle tube is fixedly connected to the first seat.

10. A percutaneous bipolar ablation device according to claim 4, characterized in that, The first housing and the second housing have the same structure. The second housing is provided with a first electrode wire and a second electrode wire. The first electrode wire is electrically connected to the needle tube, and the second electrode wire is electrically connected to the needle core.

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