A deployable multipolar ablation needle

Abstract

This invention relates to the field of medical devices and discloses a deployable multipolar ablation needle. It includes an electrode needle conduction mechanism located on a handle sleeve, with a matching groove on a grip lever for conducting thermal radiofrequency current and transmitting the traction force of the needle tip changes; a locking adjustment mechanism located on the handle sleeve, working with an outer sleeve and a locking ring groove to lock the deployed state of the ablation needle tip in real time; and an end-tip conduction mechanism located on an insulating sheath, working with a traction probe to form the ablation needle contact working structure. Through a unique hinge-type extension and deformation mechanism, the ablation needle tip can unfold within the tissue to form a preset three-dimensional structure. The operator can precisely control the degree of electrode deployment and the final ablation area size in real time by pressing the grip lever, achieving a high degree of adaptability between the ablation range and the morphology of the lesion tissue, avoiding the limitations of traditional single-point or fixed-size electrodes.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a deployable multipolar ablation needle. Background Technology

[0002] Liver cancer is one of the most common malignant tumors, and primary liver cancer is a prevalent disease in my country. In recent years, with the continuous improvement of people's living standards and corresponding changes in lifestyle, the incidence of liver cancer has greatly increased, seriously threatening people's health. The emergence of radiofrequency ablation technology has provided a new approach for the clinical treatment of liver cancer. Currently, there are numerous cases of liver cancer treatment using radiofrequency ablation technology both domestically and internationally, all achieving satisfactory results.

[0003] Traditional radiofrequency ablation methods often use straight needles with single-point or simple bifurcated structures, making it difficult to create a three-dimensional ablation zone that matches irregular lesions. The ablation range is usually fixed or has only a few preset sizes, making it impossible to make real-time fine adjustments during the procedure to adapt to different lesions. Deployable electrodes lack a reliable intraoperative locking mechanism and are prone to accidental displacement due to operation or tissue resistance, affecting positioning accuracy and increasing the risk of injury. The puncture path has insufficient insulation protection, and heat can easily spread along the needle body and burn normal tissue. If the electrode is not fully retracted when the needle is withdrawn, the deployed structure can easily scrape and tear tissue, causing secondary damage. These shortcomings limit the treatment effect and safety. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a deployable multipolar ablation needle, which solves the limitations of traditional radiofrequency ablation needles, such as poor adaptability of ablation morphology, insufficient operational stability, and inadequate tissue protection, thus affecting treatment efficacy and safety.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a deployable multipolar ablation needle, comprising: Handle sleeve for securing deployable multipolar ablation needle structure; The grip lever is located on the handle sleeve and is used by the user to manually adjust the deployment state of the ablation needle; The radio frequency output element is located on the grip sleeve and is used to output and conduct thermal radio frequency current; The insulating sheath is located on the handle sleeve and is used to guide the thermal ablation structure, ensuring that heat is released only from the needle tip and protecting normal tissue along the puncture path; The electrode needle conduction mechanism is located on the handle sleeve and works with the gripping lever's groove to conduct thermal radio frequency current and conduct the traction force of the needle tip changes. The locking adjustment mechanism is located on the handle sleeve and works with the outer sleeve and locking ring groove to lock the unfolded state of the ablation needle tip in real time; The tip conduction mechanism is located on the insulating sheath and works with the traction probe to form the working contact structure of the ablation needle. The extension and deformation mechanism is located on the tip conduction mechanism, and works with the tip sleeve, embedded slot, outer end ring and inner sliding sleeve to form a needle structure that can be expanded and contracted.

[0006] Preferably, the grip sleeve consists of a housing and a grip structure. The grip lever is embedded and rotated on the outer end of the grip sleeve, and is parallel to the grip structure of the grip sleeve. A matching groove is provided at the top of the grip lever. The radio frequency output element is sleeved on the side of the grip sleeve away from the grip lever. The insulating sheath is fixed on the side of the grip sleeve away from the grip lever. The electrode needle conduction mechanism is disposed in the grip sleeve and passes through the insulating sheath. The locking adjustment mechanism is embedded in the grip lever and extends to the inner and outer sides of the grip sleeve. The tip conduction mechanism is disposed on the outer end of the insulating sheath. Multiple extension deformation mechanisms are arranged around the tip conduction mechanism.

[0007] Preferably, the electrode needle conduction mechanism includes a traction probe, which is embedded in the grip sleeve and has a traction ball fixed at one end engaged with the grip lever. The outer sleeve is fixed to the surface of the traction probe and extends into the grip sleeve. The locking ring grooves are evenly distributed on the surface of the outer sleeve.

[0008] Preferably, the locking adjustment mechanism includes a fan-shaped torsion disc, which rotates on the side wall of the grip sleeve and extends to the outside of the grip sleeve. The fan-shaped torsion disc can be manually contacted. A fan-shaped locking disc is fixed inside the fan-shaped torsion disc and together with the fan-shaped torsion disc, they form a complete circle and can be embedded in the locking ring groove.

[0009] Preferably, the tip conduction mechanism includes a tip sleeve, which is fixed to the outer end of the insulating sheath and has grooves distributed circumferentially on the surface of the tip sleeve. The outer end ring is inserted and slides along the inner wall of the outer end of the tip sleeve, and the inner sliding sleeve is embedded in the tip sleeve.

[0010] Preferably, the extension deformation mechanism includes a central electrode plate, which is circumferentially distributed around the end tip sleeve and can be embedded in an embedding slot. A side electrode plate is hinged to one side of the central electrode plate, and the other end of the side electrode plate is embedded and rotated at the end of the embedding slot. A side electrode plate is hinged to the end of the central electrode plate away from the side electrode plate, and the other end of the side electrode plate is embedded and rotated on the outer end ring. A traction lever is hinged to the inner side of the central electrode plate, and the traction lever is circumferentially distributed and hinged around the inner sliding sleeve.

[0011] Preferably, the surface of the traction probe is synchronously attached to the inner conductive output end of the radio frequency output element.

[0012] Preferably, the side of the fan-shaped locking disc is provided with an unlocking groove, and the unlocking groove can partially wrap around the outer sleeve.

[0013] Preferably, the outer side of the embedded sliding sleeve is fixed with a pointed end cone, and the pointed end cone can pass through and retract along the inner wall of the outer end ring.

[0014] Preferably, the first side electrode and the second side electrode are also arranged in a circumferential distribution around the tip sleeve.

[0015] This invention provides a deployable multipolar ablation needle. It has the following beneficial effects: 1. This invention features a precise and controllable three-dimensional ablation morphology: Through a unique hinge-type extension and deformation mechanism, the tip of the ablation needle can unfold inside the tissue to form a preset three-dimensional structure. By pressing and gripping the lever, the operator can control the degree of electrode unfolding and the size of the final ablation area in real time, linearly and precisely. This achieves a high degree of adaptability between the ablation range and the morphology of the lesion tissue, avoiding the limitations of traditional single-point or fixed-size electrodes.

[0016] 2. This invention has dynamic range adjustment capability: The design of the electrode deployment degree being directly related to the pressure of the gripping lever allows the operator to adjust the ablation range in real time according to the actual size and shape of the lesion during the operation. This on-demand dynamic adjustment capability greatly improves the individualization and accuracy of the treatment.

[0017] 3. The present invention has a reliable locking capability in the unfolded state: the mechanical locking mechanism, which uses a fan-shaped torsion disc to drive a fan-shaped locking disc to embed into the locking ring groove, can firmly lock the electrode needle conduction mechanism (and thus the extended electrode) in the preset unfolded position. This locking mechanism effectively prevents the electrode from retracting or over-unfolding due to accidental contact or external force during subsequent operations or treatment, ensuring the stability and safety of the electrode shape during treatment and avoiding accidental thermal damage to normal tissues.

[0018] 4. This invention enables safe and minimally invasive needle withdrawal: After treatment, by simply unlocking and reversing the operation (releasing or pushing the grip lever in the opposite direction), the hinge mechanism can be driven to retract smoothly, completely retracting the unfolded electrode plate back into the insulating sheath. This design ensures that the ablation needle can be smoothly withdrawn from the tissue with minimal trauma, significantly reducing the risk of tearing or damaging the tissue due to the unfolded state of the electrode during the needle withdrawal process. Attached Figure Description

[0019] Figure 1 This is a three-dimensional schematic diagram of the main structure of the present invention. Figure 1 ; Figure 2 This is a three-dimensional schematic diagram of the main structure of the present invention. Figure 2 ; Figure 3 This is a schematic diagram of the unfolded extension deformation mechanism of the present invention; Figure 4 This is a schematic diagram of the internal structure of the grip sleeve of the present invention; Figure 5 This is a schematic diagram of the electrode needle conduction mechanism of the present invention; Figure 6 This is a schematic diagram showing the cooperation between the locking adjustment mechanism and the tip conduction mechanism of the present invention; Figure 7 This is a schematic diagram of the locking and adjusting mechanism of the present invention; Figure 8 This is a schematic diagram of the tip conduction mechanism of the present invention; Figure 9 This is a schematic diagram of the extension deformation mechanism of the present invention; Figure 10 This is a schematic diagram of the terminal cone installation state of the present invention.

[0020] The components include: 1. Handle sleeve; 2. Grip lever; 3. RF output element; 4. Insulating sheath; 5. Electrode needle conduction mechanism; 6. Locking adjustment mechanism; 7. Tip conduction mechanism; 8. Extension deformation mechanism; 51. Traction probe; 52. Traction ball; 53. Outer sleeve; 54. Locking ring groove; 61. Fan-shaped torsion disc; 62. Fan-shaped locking disc; 63. Unlocking groove; 71. Tip sleeve; 72. Embedded slot; 73. Outer ring sleeve; 74. Inner sliding sleeve; 75. End cone; 81. Central electrode plate; 82. Side electrode plate one; 83. Side electrode plate two; 84. Traction lever. Detailed Implementation

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Please see the appendix Figure 1 - Appendix Figure 3This invention provides a deployable multipolar ablation needle, including: a handle frame 1 for fixing the deployable multipolar ablation needle structure. The handle frame 1 consists of a shell and a grip structure. The handle frame 1 serves as the main support and operating platform for the entire deployable multipolar ablation needle. Its core function is to provide users with a stable grip point and to serve as the integrated basis for all other functional mechanisms, such as the grip lever 2, radio frequency output element 3, insulating sheath 4, electrode needle conduction mechanism 5, and locking adjustment mechanism 6. Users can achieve overall control of the ablation needle puncture depth, electrode deployment state, and energy release by manually operating the handle frame 1 itself or its components, such as pushing, pressing, and twisting. It is the key hub for realizing human-computer interaction and force transmission. Please see the appendix Figure 3 - Appendix Figure 4 The grip lever 2 is located on the handle sleeve 1 and is used by the user to manually adjust the unfolded state of the ablation needle. The grip lever 2 is embedded and rotated on the outer end of the handle sleeve 1. The grip lever 2 is a manual control mechanism based on the lever principle. It is installed on the handle sleeve 1 for the user to press and operate. Its independent core function is to convert the hand pressure applied by the user into a specific mechanical action, usually prying or retracting. This mechanical action directly acts on the mechanism that works with it, such as the electrode needle conduction mechanism 5, thereby driving the extension and deformation mechanism 8 of the electrode structure at the front end of the ablation needle to unfold or retract. The amount of pressure applied by the user directly determines the amplitude of the driving action, thereby controlling the degree of electrode unfolding. It is also located in parallel with the grip structure of the handle sleeve 1, and the fitting groove is set at the top of the grip lever 2. The radio frequency output element 3 is sleeved on the side of the handle sleeve 1 away from the grip lever 2. Please see the appendix Figure 2 - Appendix Figure 3 The radio frequency output element 3 is located on the handle sleeve 1 and is used to output and conduct thermal radio frequency current. The radio frequency output element 3 is the energy input interface of the ablation needle. It is fixed on the handle sleeve 1. Its core function is to receive thermal radio frequency current from the external radio frequency generator and conduct this electrical energy efficiently and stably to the electrode conduction path inside the ablation needle, namely the electrode needle conduction mechanism 5. It is a key component for introducing the external energy source into the internal system of the ablation needle, ensuring that the radio frequency energy can be delivered to the part that needs to generate thermal ablation effect. Please see the appendix Figure 2 - Appendix Figure 4The insulating sheath 4 is located on the handle sleeve 1 and is used to guide the thermal ablation structure, ensuring that heat is released only from the needle tip and protecting normal tissue in the puncture path. The insulating sheath 4 is fixed on the side of the handle sleeve 1 away from the grip lever 2. The insulating sheath 4 is installed in the output direction of the handle sleeve 1 in the direction of the needle tip. Its core function is to provide electrical insulation protection and physical guidance. It encloses the internal electrode structure, electrode needle conduction mechanism 5, tip conduction mechanism 7, and extension deformation mechanism 8, which travel in the puncture path. The insulation characteristics of the insulating sheath 4 ensure that the heat generated by the radiofrequency current does not diffuse along the needle puncture path, but is restricted to the working end of the ablation needle, i.e., the unfolded electrode, thereby protecting normal tissue in the puncture path from thermal damage. At the same time, it also provides a guiding and protective channel for the movement of the internal electrodes. Please see the appendix Figure 4 The electrode needle conduction mechanism 5 is set inside the handle sleeve 1 and passes through the insulating sheath 4. The sharp end of the electrode needle conduction mechanism 5 will also retract as a whole when the electrode needle conduction mechanism 5 is pulled back. The electrode needle conduction mechanism 5 is a core component that integrates energy conduction and mechanical force transmission. Please see the appendix Figure 1 - Appendix Figure 4 The locking adjustment mechanism 6 is embedded in the grip lever 2 and extends to the inner and outer sides of the handle sleeve 1. The user can manually turn the locking adjustment mechanism 6 to drive its locking parts to engage with the multiple locking structures configured on the electrode needle conduction mechanism 5, so as to lock the displacement range of the electrode needle conduction mechanism 5 and avoid excessive unfolding during use, which would damage the overall tissue of the human body. The tip conduction mechanism 7 is set at the outer end of the insulating sheath 4 as a fixed structure for the insertion of the radiofrequency needle tip conduction mechanism 7. After the tip of the tip conduction mechanism 7 is inserted into the skin, the user can push the handle sleeve 1 to drive the tip conduction mechanism 7 to continue to insert until it is completely inserted into the lesion tissue. The extension deformation mechanism 8 consists of multiple sets and is arranged around the tip conduction mechanism 7. When the electrode needle conduction mechanism 5 retracts, the traction force it generates will simultaneously drive the extension deformation mechanism 8 installed on the tip conduction mechanism 7 to unfold synchronously in the lesion tissue to form an elliptical structure. When the extension deformation mechanism 8 unfolds, it will also spread synchronously throughout the entire lesion tissue.

[0023] Please see the appendix Figure 4 - Appendix Figure 5The electrode needle conduction mechanism 5 is located on the grip sleeve 1 and works with the wedge groove of the grip lever 2 to conduct thermal radio frequency current and conduct the traction force of the needle tip change. The electrode needle conduction mechanism 5 includes a traction probe 51, which is embedded in the grip sleeve 1 and has a traction ball 52 fixed at one end that engages with the grip lever 2. The current output by the radio frequency output element 3 is conducted directly to the surface of the traction probe 51 that is in close contact with it through its inner conduction output end. The traction probe 51, as the main conductor, further transmits the current to the downstream tip conduction mechanism 7 and the extension deformation mechanism 8. Another core function is to transmit mechanical displacement and traction force. The traction ball 52 at one end of the traction probe 51 works with the grip lever 2. When the grip lever 2 moves, the traction probe 51 is driven to generate axial displacement through the engagement point, which is usually a retraction. Please see the appendix Figure 4 - Appendix Figure 6 The outer sleeve 53 is fixed to the surface of the traction probe 51 and extends into the grip sleeve 1. The locking ring grooves 54 are evenly distributed on the surface of the outer sleeve 53. The surface of the traction probe 51 is synchronously attached to the inner side of the RF output element 3 to conduct the output end. The outer sleeve 53 is fixed to the surface of the traction probe 51 and moves with it. This axial displacement is transmitted to the tip conduction mechanism 7 through the traction probe 51, driving the extension deformation mechanism 8 to unfold. At the same time, the locking ring grooves 54 on the surface of the outer sleeve 53 provide a mechanical engagement point for the locking adjustment mechanism 6 to achieve position fixation.

[0024] Please see the appendix Figure 6 - Appendix Figure 7 The locking adjustment mechanism 6 is located on the handle sleeve 1 and works with the outer sleeve 53 and the locking ring groove 54 to lock the unfolded state of the ablation needle tip in real time. The locking adjustment mechanism 6 includes a fan-shaped torsion disc 61, which rotates on the side wall of the handle sleeve 1 and extends to the outside of the handle sleeve 1. The fan-shaped torsion disc 61 can be manually contacted. Its core function is to lock the current position of the electrode needle conduction mechanism 5, i.e. the position of the outer sleeve 53. When the user manually rotates the fan-shaped torsion disc 61, it drives the fan-shaped locking disc 62 fixed to it to rotate. The fan-shaped locking disc 62 is embedded in the locking ring groove 54 on the surface of the outer sleeve 53 of the electrode needle conduction mechanism 5. Please see the appendix Figure 7A sector-shaped locking disc 62 is fixed to the inner side of the sector-shaped torsion disc 61, forming a complete circle together with the sector-shaped torsion disc 61. It can also be embedded in the locking ring groove 54. The sector-shaped locking disc 62 has an unlocking groove 63 on its side, and the unlocking groove 63 can partially wrap around the outer sleeve 53. The sector-shaped locking disc 62 is embedded in the locking ring groove 54 on the surface of the outer sleeve 53 of the electrode needle conduction mechanism 5, forming a mechanical engagement, thereby preventing further movement of the outer sleeve 53 and the traction probe 51 connected to it. This indirectly locks the extended deformation mechanism 8 in its unfolded state. When it is necessary to unlock, the sector-shaped torsion disc 61 is rotated in the opposite direction, and the sector-shaped locking disc 62 is disengaged from the locking ring groove 54. The design of the unlocking groove 63 helps to accommodate the outer sleeve 53 in the unlocked state and avoid interference.

[0025] Please see the appendix Figure 8 - Appendix Figure 10 The tip conduction mechanism 7 is located on the insulating sheath 4 and works with the traction probe 51 to form the ablation needle contact working structure. The tip conduction mechanism 7 includes a tip sleeve 71, which is fixed to the outer end of the insulating sheath 4. The embedded slots 72 are circumferentially distributed on the surface of the tip sleeve 71. The axial traction force or thrust transmitted by the electrode needle conduction mechanism 5 is converted into mechanical action to drive the extension deformation mechanism 8 to unfold or retract. The movement of the inner sliding sleeve 74 directly pulls or pushes the extension deformation mechanism 8 components such as the traction lever 84 that are hinged on it. At the same time, the tip sleeve 71 and the circumferentially distributed embedded slots 72 provide rotation fulcrum and embedding position for the central electrode plate 81 and the first side electrode plate 82 of the extension deformation mechanism 8. The outer end ring 73 provides a hinge point for the second side electrode plate 83. Please see the appendix Figure 10 The outer end ring 73 slides along the inner wall of the outer end of the tip sleeve 71, and the inner sliding sleeve 74 is embedded in the tip sleeve 71. A terminal cone 75 is fixed to the outer side of the inner sliding sleeve 74, and the terminal cone 75 can pass through and retract along the inner wall of the outer end ring 73. The terminal cone 75 is responsible for piercing the tissue. The inner sliding sleeve 74 can slide within the outer end ring 73 and the tip sleeve 71. Its movement is driven by the traction probe 51 of the electrode needle conduction mechanism 5. Please see the appendix Figure 8 - Appendix Figure 9 The extension and deformation mechanism 8 is located on the tip conduction mechanism 7. Together with the tip sleeve 71, the embedded slot 72, the outer end ring 73, and the inner sliding sleeve 74, it forms a needle structure that can be expanded and contracted. The extension and deformation mechanism 8 is the core working end of the ablation needle to achieve three-dimensional energy release. It is located directly on the tip conduction mechanism 7 and is composed of multiple sets of circumferentially distributed central electrode plates 81, side electrode plate one 82, side electrode plate two 83, and traction lever 84 connected by hinges. Please see the appendix Figure 9The extension deformation mechanism 8 includes a central electrode plate 81, which is circumferentially distributed around the end tip sleeve 71 and can be embedded in the embedding slot 72. A side electrode plate 82 is hinged to one side of the central electrode plate 81, and the other end of the side electrode plate 82 is embedded and rotated at the end of the embedding slot 72. A side electrode plate 83 is hinged to one end of the central electrode plate 81 away from the side electrode plate 82, and the other end of the side electrode plate 83 is embedded and rotated on the outer end ring 73. When the traction force from the embedded sliding sleeve 74 of the end tip conduction mechanism 7 is transmitted through the traction lever 84, the hinge system deforms: the central electrode plate 81 is pushed outward, and the side electrode plates 82 and 83 unfold accordingly, so that the entire mechanism changes from a contracted needle shape to an unfolded three-dimensional structure such as an ellipse. The contraction process is the opposite. Please see the appendix Figure 8 - Appendix Figure 9 The central electrode 81 is hinged to a traction lever 84 on its inner side, and the traction lever 84 is circumferentially hinged to the embedded sliding sleeve 74. The side electrode 82 and the side electrode 83 are also circumferentially distributed around the tip sleeve 71. Another core function is to serve as the final release electrode for radiofrequency energy. After unfolding, the central electrode 81, the side electrode 82, and the side electrode 83 directly contact the lesion tissue. The radiofrequency current conducted from the electrode needle conduction mechanism 5 is released into the tissue through these unfolded electrode pieces, generating impedance heat around the electrode pieces and forming a three-dimensional ablation area that matches the unfolded shape of the electrode. The degree of unfolding determines the size and shape of the ablation range.

[0026] Based on the above technical solution, this embodiment also provides a working principle for a deployable multipolar ablation needle, including the following: Initial state and puncture location: The main body of the device consists of a handle frame 1, which is held by the operator. The radio frequency output element 3 is fixed on the handle frame 1 and is responsible for receiving and conducting the thermal radio frequency current generated by the external radio frequency generator. The insulating sheath 4 is installed at the output end of the handle frame 1 in the direction of the needle tip. Its main function is insulation protection. It wraps around and guides the internal electrode structure to ensure that the heat generated by the radio frequency current is only released in the target area of ​​the needle tip, thereby protecting the normal tissue along the puncture path from thermal damage. The tip conduction mechanism 7 is the structure at the front end of the ablation needle. It includes a tip cone 75. After the operator inserts the tip cone 75 into the skin, he pushes the entire handle frame 1 to drive the tip conduction mechanism 7 to continue to penetrate deeper until its tip is completely inserted and positioned inside the target lesion tissue. At this time, the extension deformation mechanism 8 is in a fully contracted state and wrapped inside the insulating sheath 4 and the tip conduction mechanism 7. Electrode deployment and morphology control: After positioning, the operator presses the grip lever 2 mounted on the handle sleeve 1. The pressing action creates a lever effect on the grip lever 2, applying a retraction force. This retraction force is transmitted through the cooperation structure between the grip lever 2 and the electrode needle conduction mechanism 5, especially the traction ball 52 at one end of the traction probe 51, which engages in the wedge groove of the grip lever 2. The retraction force pulls the entire electrode needle conduction mechanism 5 to move in the direction of the operator, i.e., the retraction direction, within the handle sleeve 1. The retraction displacement of the electrode needle conduction mechanism 5 is transmitted to the inner sliding sleeve 74 of the tip conduction mechanism 7 through the traction probe 51 inside it. The retraction movement of the inner sliding sleeve 74 plays a key role in the extension deformation mechanism 8 relative to the fixed tip sleeve 71 and the outer end ring 73. The retraction of the inner sliding sleeve 74 pulls the traction lever 84, which is circumferentially hinged to it. The movement of the traction lever 84, in turn, pulls... The central electrode 81 is hinged to the side electrode 82, which is hinged to the fixed embedded slot 72 at one end and belongs to the tip sleeve 71 at the end. The other end is hinged to the outer ring 73 through the side electrode 83. As the inner sliding sleeve 74 retracts, the traction lever 84 forces the central electrode 81 to move outward, while pushing the side electrode 83, which in turn drives the entire hinge structure to unfold. Multiple such structures are circumferentially distributed and unfold synchronously, eventually forming a three-dimensional electrode structure similar to an ellipse inside the lesion tissue. The pressure applied by the operator to the grip lever 2 determines the displacement of the electrode needle conduction mechanism 5, thereby directly controlling the degree of unfolding of the extension deformation mechanism 8, i.e. the size of the ellipse formed. This allows the operator to customize the ablation range according to the actual size and shape of the lesion tissue. Unlock status: Once the desired degree of expansion is reached, the operator needs to lock the electrode position to prevent accidental movement during subsequent operations or treatments that could lead to excessive expansion and tissue damage. The operator manually rotates the fan-shaped torsion disc 61 of the locking adjustment mechanism 6. The rotation of the fan-shaped torsion disc 61 causes the fan-shaped locking disc 62 fixed inside it to rotate as well. The fan-shaped locking disc 62 rotates and embeds into the locking ring grooves 54 evenly distributed on the surface of the outer sleeve 53 of the electrode needle conduction mechanism 5. This embedding and engagement firmly locks the outer sleeve 53 together with the entire electrode needle conduction mechanism 5 in the current position, preventing it from retracting or advancing further, thereby fixing the expansion state of the extension deformation mechanism 8. Radiofrequency energy release and tissue ablation: After the electrodes are fully deployed and locked, the external radio frequency generator is connected to the radio frequency output element 3 via wires. The radio frequency output element 3 conducts the thermal radio frequency current to the electrode needle conduction mechanism 5, which is closely attached to its inner conduction output end. The current is mainly the traction probe 51. The current is conducted through the electrode needle conduction mechanism 5 to the tip conduction mechanism 7. Finally, the current is conducted to all the electrode plates of the deployed extension deformation mechanism 8, including the central electrode plate 81, the first side electrode plate 82, and the second side electrode plate 83. These deployed electrode plates directly contact the lesion tissue. The high-frequency alternating current generates impedance heat in the tissue, causing the tissue cells around the electrode plates to be heated and coagulated and necrotic, forming a three-dimensional ablation area that matches the shape of the deployed electrode. The presence of the insulating sheath 4 ensures that the heat is mainly concentrated in this deployed three-dimensional area for release, rather than dissipating along the puncture path. Treatment completion and needle withdrawal: After the preset ablation time and energy are reached, the radiofrequency energy output stops. The operator reverses the fan-shaped torsion disc 61 of the locking adjustment mechanism 6, causing the fan-shaped locking disc 62 to disengage from the locking ring groove 54. Guided by the unlocking groove 63, the lock is released, and the gripping lever 2 is released. Alternatively, the operation is reversed to advance the electrode needle conduction mechanism 5. The advancement of the electrode needle conduction mechanism 5 drives the embedded sliding sleeve 74 forward, pushing the traction lever 84, which in turn drives the hinge structure of the extension deformation mechanism 8 to retract. The electrode sheet retracts back into the insulating sheath 4. Finally, the entire ablation needle is smoothly withdrawn from the tissue.

[0027] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A deployable multipolar ablation needle, characterized in that, include: A handle sleeve (1) is used to fix the deployable multipolar ablation needle structure; The grip lever (2) is located on the grip sleeve (1) and is used by the user to manually adjust the unfolded state of the ablation needle; The radio frequency output element (3) is located on the grip sleeve (1) and is used to output and conduct thermal radio frequency current; The insulating sheath (4) is located on the handle sleeve (1) and is used to guide the thermal ablation structure to ensure that heat is released only from the needle tip and to protect normal tissue along the puncture path. The electrode needle conduction mechanism (5) is located on the handle sleeve (1) and is used in conjunction with the mating groove of the gripping pry bar (2) to conduct thermal radio frequency current and conduct the traction force of the needle tip change. The locking adjustment mechanism (6) is located on the handle sleeve (1) and works with the outer sleeve (53) and the locking ring groove (54) to lock the unfolded state of the ablation needle tip in real time. The tip conduction mechanism (7) is located on the insulating sheath (4) and works with the traction probe (51) to form the ablation needle contact working structure; The extension deformation mechanism (8) is located on the tip conduction mechanism (7) and works with the tip sleeve (71), the embedded slot (72), the outer end ring (73) and the inner sliding sleeve (74) to form an expandable and retractable needle structure.

2. The deployable multipolar ablation needle according to claim 1, characterized in that, The grip sleeve (1) consists of a housing and a grip structure. The grip lever (2) is embedded and rotated on the outer end of the grip sleeve (1) and is parallel to the grip structure of the grip sleeve (1). The wedge groove is provided at the top of the grip lever (2). The radio frequency output element (3) is sleeved on the side of the grip sleeve (1) away from the grip lever (2). The insulating sheath (4) is fixed on the side of the grip sleeve (1) away from the grip lever (2). The electrode needle conduction mechanism (5) is provided inside the grip sleeve (1) and passes through the insulating sheath (4). The locking adjustment mechanism (6) is embedded on the grip lever (2) and extends to the inner and outer sides of the grip sleeve (1). The tip conduction mechanism (7) is provided on the outer end of the insulating sheath (4). The extension deformation mechanism (8) consists of multiple sets and is arranged around the tip conduction mechanism (7).

3. The deployable multipolar ablation needle according to claim 1, characterized in that, The electrode needle conduction mechanism (5) includes a traction probe (51), which is embedded in the grip sleeve (1), and a traction ball (52) fixed at one end is engaged with the grip lever (2). The outer sleeve (53) is fixed on the surface of the traction probe (51) and extends into the grip sleeve (1). The locking ring grooves (54) are evenly distributed on the surface of the outer sleeve (53).

4. The deployable multipolar ablation needle according to claim 1, characterized in that, The locking adjustment mechanism (6) includes a fan-shaped torsion disc (61), which rotates on the side wall of the grip sleeve (1) and extends to the outside of the grip sleeve (1). The fan-shaped torsion disc (61) can be manually contacted. A fan-shaped locking disc (62) is fixed inside the fan-shaped torsion disc (61) and together with the fan-shaped torsion disc (61), they form a complete circle and can be embedded in the locking ring groove (54).

5. The deployable multipolar ablation needle according to claim 1, characterized in that, The tip conduction mechanism (7) includes a tip sleeve (71), which is fixed to the outer end of the insulating sheath (4) and has a groove (72) circumferentially distributed on the surface of the tip sleeve (71). The outer end ring (73) slides along the inner wall of the outer end of the tip sleeve (71), and the inner sliding sleeve (74) is embedded in the tip sleeve (71).

6. The deployable multipolar ablation needle according to claim 1, characterized in that, The extension deformation mechanism (8) includes a central electrode plate (81), which is circumferentially distributed around the tip sleeve (71) and can be embedded in the embedding slot (72). A side electrode plate (82) is hinged to one side of the central electrode plate (81), and the other end of the side electrode plate (82) is embedded and rotated at the end of the embedding slot (72). A side electrode plate (83) is hinged to one end of the central electrode plate (81) away from the side electrode plate (82), and the other end of the side electrode plate (83) is embedded and rotated on the outer end ring (73). A traction lever (84) is hinged to the inner side of the central electrode plate (81), and the traction lever (84) is circumferentially distributed and hinged around the inner sliding sleeve (74).

7. The deployable multipolar ablation needle according to claim 3, characterized in that, The surface of the traction probe (51) is synchronously attached to the inner conductive output end of the radio frequency output element (3).

8. The deployable multipolar ablation needle according to claim 4, characterized in that, The side of the fan-shaped locking disc (62) is provided with an unlocking groove (63), and the unlocking groove (63) can be partially wrapped around the outer sleeve (53).

9. A deployable multipolar ablation needle according to claim 5, characterized in that, The inner sleeve (74) is fixed with an end cone (75) on the outside, and the end cone (75) can pass through and retract along the inner wall of the outer end ring (73).

10. A deployable multipolar ablation needle according to claim 6, characterized in that, The first side electrode plate (82) and the second side electrode plate (83) are also arranged in a circumferential distribution around the tip sleeve (71).

Images