A radiofrequency ablation needle for tumor specialty

Abstract

The utility model relates to a tumor radio frequency technical field especially, more particularly to a kind of radio frequency ablation needle based on tumor speciality, including handle, needle tube and ablation component, the needle tube is fixedly arranged in the handle front end, the ablation component is set in the end of needle tube, the handle rear end is provided with electrode assembly, the ablation component includes needle head and several ablation needles, the needle head, ablation needle all are connected with electrode assembly, several the ablation needle can move along the axial movement of needle head;Through the ablation needle array structure of dynamic adjustment, combine axial displacement driving mechanism, the accurate regulation and control of ablation range is realized, the linkage design of push rod and needle cover in handle rear end is through movable pipe, when push rod pushes movable pipe forward, needle cover slides along fixed tube axis, force multiple ablation needles to expand synchronously outward by articulated connecting rod mechanism, form adjustable umbrella-shaped ablation array;Solved the problem of ablation uneven caused by the unified power output of traditional equipment.

Description

Technical Field

[0001] This utility model relates to the field of radiofrequency ablation technology for tumors, and in particular to a radiofrequency ablation needle for tumor specialties. Background Technology

[0002] Radiofrequency ablation is a type of thermal coagulation therapy. It utilizes alternating radiofrequency current with wavelengths of 460kHz to 500kHz to generate heat through high-speed oscillation and friction of charged particles in the surrounding tissue via radiofrequency electrode needles. The temperature can reach 50 to 110°C, causing coagulative necrosis of tumor cells around the electrode, thereby inactivating the tumor cells. This is a minimally invasive treatment method. The degree of heat generation is positively correlated with the current intensity and duration, negatively correlated with impedance, and closely related to the tissue water content, tissue blood flow, and heating rate.

[0003] Existing radiofrequency ablation needles can typically only act on lesion tissue with the same radiofrequency parameters (such as power, temperature, and time) at the same time. However, there are differences in tissue density, vascular distribution, and thermal sensitivity between the inner and outer edges of the tumor, resulting in uneven ablation effects. This may lead to over-ablation of the core area or incomplete ablation of the edges. In addition, the ablation range of traditional single needles or bipolar electrodes is fixed and it is difficult to dynamically adjust according to the size and shape of the lesion. In particular, multiple punctures are required for irregular or large tumors, which increases the complexity of the operation and the risk of complications. Utility Model Content

[0004] The main purpose of this invention is to provide a radiofrequency ablation needle for oncology, which aims to solve the problem that existing ablation needles cannot be adaptively modified according to the tumor condition.

[0005] To achieve the above objectives, this utility model provides a radiofrequency ablation needle for oncology, including a handle, a needle tube, and an ablation assembly. The needle tube is fixedly disposed at the front end of the handle, and the ablation assembly is disposed at the end of the needle tube. An electrode assembly is disposed at the rear end of the handle. The ablation assembly includes a needle tip and a plurality of ablation needles. The needle tip and ablation needles are both connected to the electrode assembly, and the plurality of ablation needles can move along the axial direction of the needle tip.

[0006] Optionally, a push rod is provided at the rear end of the handle, and a fixed tube and a movable tube are provided on the side of the needle tube near the needle tip. One end of the movable tube is connected to the push rod, and the needle tip includes a needle sleeve fitted around the periphery of the fixed tube. The needle sleeve is connected to the other end of the movable tube.

[0007] Optionally, the end of the ablation needle is rotatably mounted on the needle head, and a connecting rod is hinged to the ablation needle, with the movable end of the connecting rod hinged to the needle sleeve.

[0008] Optionally, the push rod is provided with a sliding groove, and an adjusting tooth is provided in the sliding groove. A knob is rotatably provided on the handle, and an adjusting wheel matching the adjusting tooth is provided at the end of the knob.

[0009] Optionally, each ablation needle is provided with a radiofrequency ablation electrode connected to the electrode assembly.

[0010] Optionally, the ablation needle includes a bent portion and a connecting portion, and several bent portions can be spliced ​​together to form a needle tip.

[0011] Optionally, the radiofrequency ablation needle further includes a cooling assembly disposed on the needle tube.

[0012] Optionally, the cooling assembly includes a cooling pipe disposed within the connection portion and extending to the bend portion, and the radiofrequency ablation electrode is disposed within the bend portion.

[0013] Optionally, the cooling assembly further includes a cooling nozzle disposed on the needle tube, the cooling nozzle being connected to the cooling conduit and used to cool the ablation needle.

[0014] Optionally, the outer periphery of the cooling nozzle is provided with a plurality of fins.

[0015] This invention proposes a radiofrequency ablation needle for oncology, which achieves precise control of the ablation range through a dynamically adjustable ablation needle array structure combined with an axial displacement driving mechanism. The push rod at the rear of the handle, through the linkage design of the movable tube and the needle sleeve, converts the operator's pushing and pulling action into the radial unfolding motion of the ablation needle. When the push rod pushes the movable tube forward, the needle sleeve slides axially along the fixed tube, and the hinged linkage mechanism forces multiple ablation needles to unfold outward synchronously, forming an adjustable umbrella-shaped ablation array. This mechanical conversion mechanism allows a single puncture to form an ablation area with a controllable diameter, which is especially suitable for the treatment of irregular or large tumors. At the same time, the radiofrequency electrode at the end of the ablation needle is directly connected to the handle electrode assembly, ensuring that each ablation needle can independently apply differentiated radiofrequency parameters, solving the problem of uneven ablation caused by uniform power output in traditional devices. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram showing part of the internal structure of this utility model; Figure 3 for Figure 2 A magnified structural diagram of A in the middle; Figure 4 This is a schematic diagram of the ablation component and the needle. Figure label: 1-Handle, 2-Needle, 3-Ablation assembly, 4-Electrode assembly, 5-Cooling nozzle; 11-Push rod, 12-Slide groove, 13-Knob; 21-Fixed tube, 22-Modible tube; 31-Needle, 32-Ablation needle, 33-Connecting rod; 311-Needle Sheath; 321 - Bending part, 322 - Connecting part; 51-Fin.

[0017] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0020] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0021] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0022] Example: Please refer to the attached document as well. Figure 1 To be continued Figure 4 In this embodiment, a radiofrequency ablation needle 32 for oncology is provided, including a handle 1, a needle tube 2, and an ablation component 3. The needle tube 2 is fixedly disposed at the front end of the handle 1, and the ablation component 3 is disposed at the end of the needle tube 2. An electrode component 4 is disposed at the rear end of the handle 1. The ablation component 3 includes a needle tip 31 and a plurality of ablation needles 32. The needle tip 31 and the ablation needles 32 are both connected to the electrode component 4, and the plurality of ablation needles 32 can move along the axial direction of the needle tip 31.

[0023] It should be noted that existing radiofrequency ablation needles 32 can usually only act on lesion tissue with the same radiofrequency parameters at the same time. However, there are differences in tissue density, vascular distribution and thermal sensitivity between the core and outer edge of the tumor, resulting in uneven ablation effects. This may cause over-ablation of the core area or incomplete ablation of the edge. In addition, the ablation range of traditional single needles or bipolar electrodes is fixed and it is difficult to dynamically adjust according to the size and shape of the lesion. In particular, multiple punctures are required for irregular or large tumors, which increases the complexity of the operation and the risk of complications.

[0024] To address the aforementioned issues, this embodiment provides a radiofrequency ablation needle 32 for oncology. By incorporating an ablation component 3 with a variable outer diameter at the end of the needle tube 2, adaptability to tumors of varying sizes is increased. Specifically, the ablation needle 32 has a bent portion 321, and a connecting portion 322 is connected to a needle sleeve 311 via a connecting rod 33. The needle sleeve 311 is slidably mounted on a fixed tube 21. Furthermore, the needle sleeve 311 is also fixedly connected to a movable tube 22, the end of which is connected to a push rod 11. When the push rod 11 undergoes axial displacement, the needle… The sleeve 311 then undergoes axial displacement. Since the end of the connecting part 322 is hinged to the needle 31 and the middle part is hinged to one end of the connecting rod 33, and the other end of the connecting rod 33 is connected to the needle sleeve 311, the axial displacement of the needle sleeve 311 is converted into the circumferential displacement of the ablation needle 32. This allows for effective adjustment of the overall outer diameter of the ablation needle 32. By adjusting the position of the ablation needle 32, the radiofrequency ablation electrode can produce effects at different locations on the tumor, thus solving the problem that the ablation needle 32 in the prior art cannot be adaptively changed according to the tumor condition.

[0025] The aforementioned structure employs a dynamically adjustable array of ablation needles 32, combined with an axial displacement drive mechanism, to achieve precise control of the ablation range. The push rod 11 at the rear of the handle 1, through the linkage design between the movable tube 22 and the needle sleeve 311, converts the operator's pushing and pulling motion into the radial unfolding motion of the ablation needles 32. When the push rod 11 pushes the movable tube 22 forward, the needle sleeve 311 slides axially along the fixed tube 21, forcing multiple ablation needles 32 to unfold outward synchronously via the hinged linkage 33 mechanism, forming an adjustable umbrella-shaped ablation array.

[0026] This mechanical conversion mechanism allows for the formation of an ablation area with a controllable diameter with a single puncture, making it particularly suitable for the treatment of irregular or large tumors. Meanwhile, the radiofrequency electrode at the end of the ablation needle 32 is directly connected to the electrode assembly 4 of the handle 1, ensuring that each ablation needle 32 can independently apply differentiated radiofrequency parameters, thus solving the problem of uneven ablation caused by uniform power output in traditional devices.

[0027] In this embodiment, a push rod 11 is provided at the rear end of the handle 1, and a fixed tube 21 and a movable tube 22 are provided on the side of the needle tube 2 near the needle tip 31. One end of the movable tube 22 is connected to the push rod 11, and the needle tip 31 includes a needle sleeve 311 sleeved on the outer periphery of the fixed tube 21. The needle sleeve 311 is connected to the other end of the movable tube 22.

[0028] In this embodiment, the end of the ablation needle 32 is rotatably mounted on the needle tip 31, and a connecting rod 33 is hinged to the ablation needle 32. The movable end of the connecting rod 33 is hinged to the needle sleeve 311.

[0029] Understandably, the push rod 11 at the end of the handle 1 acts as a primary drive source, transmitting axial thrust through the rigidly connected movable tube 22; the fixed tube 21 at the front end of the needle tube 2 acts as a static support structure, forming a sliding pair with the movable tube 22 to achieve precise guidance; the needle sleeve 311, fitted around the fixed tube 21, acts as a secondary transmission mechanism, converting the linear motion of the movable tube 22 into the radial displacement of the ablation needle 32 as it unfolds. When the operator pushes the push rod 11, the movable tube 22 drives the needle sleeve 311 to slide axially along the fixed tube 21. At this time, the linkage 33 mechanism between the needle sleeve 311 and the ablation needle 32 converts the linear motion into the arc-shaped unfolding path of the ablation needle 32.

[0030] It is also understandable that the coaxial nested structure of the fixed tube 21 and the movable tube 22 forms a rigid guide rail, eliminating the structural deformation that may be caused by multi-degree-of-freedom motion and ensuring the stability of the trajectory during the unfolding process. The stroke of the push rod 11 has a strict proportional function relationship with the unfolding radius of the ablation needle 32, and precise control of the radius increment corresponding to millimeter-level displacement can be achieved through calibration.

[0031] In some embodiments, the wiring of the ablation needle 32 is disposed within the fixing tube 21.

[0032] In this embodiment, the push rod 11 is provided with a sliding groove 12, and an adjusting tooth is provided in the sliding groove 12. A knob 13 is rotatably provided on the handle 1, and an adjusting wheel matching the adjusting tooth is provided at the end of the knob 13.

[0033] In some embodiments, a groove 12 with a helical rack structure is provided on the surface of the push rod 11, which together with the planetary gear set at the end of the knob 13 forms a precision transmission system. A three-stage reduction gear set is provided inside the knob 13 to convert the rotational motion into millimeter-level linear displacement of the push rod 11.

[0034] When knob 13 is rotated clockwise, the meshing of the planetary gear and the helical rack generates axial thrust, pushing push rod 11 forward in precise steps; when rotated counterclockwise, the toothed self-locking structure generates holding torque to prevent accidental displacement during the operation.

[0035] In some embodiments, the silicone damping block disposed in the slide 12 forms a composite buffer system with the gear set, effectively absorbing the minute displacement caused by the vibration of the instrument.

[0036] In this embodiment, each of the ablation needles 32 is provided with a radiofrequency ablation electrode connected to the electrode assembly 4.

[0037] In some embodiments, an independent radiofrequency ablation electrode is embedded in the bend 321 of each ablation needle 32 and connected to the smart electrode assembly 4 at the rear end of the handle 1 via a spirally wound micro-coaxial cable. Each electrode is equipped with an independent impedance detection module and a temperature sensor, forming a closed-loop feedback control system.

[0038] When the ablation needle 32 is deployed, each electrode dynamically adjusts its output power based on the real-time collected local tissue impedance value through a digital signal processor, thereby achieving differentiated energy delivery between the tumor core area and the peripheral area.

[0039] In this embodiment, the ablation needle 32 includes a bent portion 321 and a connecting portion 322, and a plurality of the bent portions 321 can be spliced ​​together to form a needle tip.

[0040] In some embodiments, the fold is formed by stamping a high-elasticity nickel-titanium alloy sheet, and its cross-section has an arc-shaped concave structure. The contact surfaces of adjacent folds 321 are precision ground to form a self-locking bevel.

[0041] In some embodiments, the tips of the multiple bends 321 are tightly engaged by a dovetail tenon structure to form a continuous and smooth puncture cone surface, with its apex angle controlled at a golden puncture angle of 18°±1°; when unfolded, the bends 321 bend outward along the deformation trajectory of the pre-placed shape memory alloy, and the mechanical engagement between each bend 321 is transformed into an independent support structure.

[0042] In this embodiment, the radiofrequency ablation needle 32 further includes a cooling component disposed on the needle tube 2.

[0043] In some embodiments, a dual-channel cooling structure is integrated within the tube wall: the outer layer is a spiral microfluidic cooling layer with embedded phase change energy storage material; the inner layer is the main cooling pipeline extending to the connection part 322 of the ablation needle 32, and branching out multiple radial capillaries that penetrate to the electrode cavity of the bend part 321.

[0044] In this embodiment, the cooling assembly includes a cooling pipe disposed within the connecting portion 322 and extending to the bending portion 321, and the radiofrequency ablation electrode is disposed within the bending portion 321.

[0045] In some embodiments, the connection portion 322 of the ablation needle 32 is provided with a main cooling pipe, which adopts a spirally wound titanium alloy microtube structure. After extending axially to the bend portion 321, it branches out into multiple radial capillary branches to form a tree-like cooling channel system.

[0046] In some embodiments, a conical atomizing nozzle is connected to the end of the capillary branch to atomize and spray coolant (0.9% NaCl solution) at a 45° angle onto the back side of the inner electrode working surface of the bend 321, forming a liquid film layer with a thickness of 0.1 mm.

[0047] In this embodiment, the cooling assembly further includes a cooling nozzle 5 disposed on the needle tube 2, the cooling nozzle 5 being connected to the cooling pipeline and used to cool the ablation needle 32.

[0048] In some embodiments, the cooling nozzle 5 is preferably a conical atomizing nozzle.

[0049] In this embodiment, the outer periphery of the cooling nozzle 5 is provided with a plurality of fins 51.

[0050] In some embodiments, the outer surface of the cooling nozzle 5 is provided with radially arranged groups of gradually varying height fins 51, which are precision cast from aluminum nitride ceramic matrix composite material. The height of the fins 51 gradually varies along the axial direction, and the spacing is distributed in an equal gradient to form a turbine-type heat dissipation structure with a spiral lift angle.

[0051] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A radiofrequency ablation needle for oncology, characterized in that, The device includes a handle, a needle tube, and an ablation assembly. The needle tube is fixedly disposed at the front end of the handle, and the ablation assembly is disposed at the end of the needle tube. An electrode assembly is disposed at the rear end of the handle. The ablation assembly includes a needle tip and a plurality of ablation needles. The needle tip and ablation needles are both connected to the electrode assembly, and the plurality of ablation needles can move along the axial direction of the needle tip.

2. The radiofrequency ablation needle for oncology as described in claim 1, characterized in that, A push rod is provided at the rear end of the handle. A fixed tube and a movable tube are provided on the side of the needle tube near the needle tip. One end of the movable tube is connected to the push rod. The needle tip includes a needle sleeve fitted around the periphery of the fixed tube. The needle sleeve is connected to the other end of the movable tube.

3. The radiofrequency ablation needle for oncology as described in claim 2, characterized in that, The end of the ablation needle is rotatably mounted on the needle head, and a connecting rod is hinged to the ablation needle. The movable end of the connecting rod is hinged to the needle sleeve.

4. The radiofrequency ablation needle for oncology as described in claim 2, characterized in that, The push rod is provided with a sliding groove, and an adjusting tooth is provided in the sliding groove. A knob is rotatably provided on the handle, and an adjusting wheel matching the adjusting tooth is provided at the end of the knob.

5. The radiofrequency ablation needle for oncology as described in claim 1, characterized in that, Each ablation needle is equipped with a radiofrequency ablation electrode that is connected to the electrode assembly.

6. The radiofrequency ablation needle for oncology as described in claim 5, characterized in that, The ablation needle includes a bent portion and a connecting portion, and several of the bent portions can be spliced ​​together to form a needle tip.

7. A radiofrequency ablation needle for oncology as described in claim 6, characterized in that, The radiofrequency ablation needle also includes a cooling component disposed on the needle tube.

8. A radiofrequency ablation needle for oncology as described in claim 7, characterized in that, The cooling assembly includes a cooling pipe disposed within the connecting portion and extending to the bend portion, and the radiofrequency ablation electrode is disposed within the bend portion.

9. A radiofrequency ablation needle for oncology as described in claim 8, characterized in that, The cooling assembly also includes a cooling nozzle disposed on the needle tube, the cooling nozzle being connected to the cooling pipeline and used to cool the ablation needle.

10. A radiofrequency ablation needle for oncology as described in claim 9, characterized in that, The cooling nozzle has several fins on its outer periphery.

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