Plug-in type surgical electrode front end assembly and electrode of plug-in type surgical electrode front end assembly

Abstract

The invention belongs to the technical field of electrosurgical medical instruments, and relates to a plug-in surgical electrode front-end assembly which comprises a puncture needle. A sleeve is sleeved outside the near end of the puncture needle; the far end of the cannula is a negative plate perpendicular to the axis of the cannula, and an exposed working electrode is arranged between the far end of the puncture needle and the negative plate. The interior of the sleeve is isolated from the puncture needle through an insulating layer I, and the sleeve is coated with an insulating layer II; in a working state, current movement between the working electrode and the negative electrode plate at least enables the action area of one section close to the far end of the working electrode to be gradually increased from the far end to the near end. The electrode has a small acting area and a wide acting area, the two acting areas are smoothly connected, and the technical problem that the energy coverage area is too large or too small when an existing electrode works can be solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of electrosurgical medical devices, and particularly relates to a front-end assembly of an insertable surgical electrode and an electrode thereof. Background Art

[0002] Electrosurgical instruments are often used in surgical operations, such as electrocautery knives, electrocoagulation forceps, ultrasonic scalpels, electrocoagulation forceps, plasma knives, etc., and their functions cover aspects such as cutting and hemostasis. These electrosurgical instruments are connected to the host through cables and plugs. The energy generated by different hosts is transmitted to the electrosurgical instruments through the plugs and cables, and the electrosurgical instruments directly act on the human body for operations such as cutting and hemostasis.

[0003] Common ablation modes include: monopolar ablation and bipolar ablation.

[0004] I. Monopolar Ablation A typical example is an electrocautery knife instrument. The negative electrode plate is an important part of the electrocautery knife instrument, and its main function is to form a complete current loop. During the operation, the high-frequency current generated when the electrocautery knife cuts tissue needs to flow back to the host through the negative electrode plate to form a closed circuit. The negative electrode plate is usually made of materials with good electrical conductivity, such as metals or carbon materials, to ensure the smooth conduction of current. Monopolar ablation has the following characteristics: 1. It needs to be used in conjunction with a negative electrode plate, which is generally attached to large areas of the human body such as the back and thighs, often far from the treatment target area.

[0005] 2. Advantage: The ablation range is large.

[0006] 3. Disadvantages: The ablation shape is irregular, the current flows through most of the body, the energy coverage area is large, and there is a risk of burns; in addition, if the operator directly touches the human body, there is also a certain risk of electric shock.

[0007] 4. Monopolar is gradually being phased out due to safety concerns.

[0008] II. Bipolar Ablation Typical examples are bipolar radiofrequency ablation electrodes and plasma electrodes. For example, a surgical electrode for mass ablation disclosed in Chinese Patent CN 201921262691.7. This bipolar ablation has the following characteristics: 1. Advantage: The current only flows between the electrode ranges and does not flow through most of the body, the energy coverage area is small, and the operation is safer; 2. Disadvantages: The ablation range is small, and the shape is a slender spindle, which is not suitable for large-area ablation.

[0009] In clinical practice, there are many times when it is necessary to quickly ablate a large area of human tissue. Based on the obvious defects of the above two methods, it is necessary to develop an electrode that combines the advantages of both.

[0010] In the existing bipolar ablation methods, perhaps only the bipolar electrodes arranged in parallel may have a function closer to the requirements. For example, a fluid controllable hemostatic front-end component, electrode and its system disclosed in Chinese Patent CN202310687133.X, and a combined hemostatic instrument disclosed in Chinese Patent CN201910670161.4. This bipolar ablation has the following characteristics: 1. Advantages: The ablation range of these patent solutions is controllable, and the shape after ablation is regular and square, which is conducive to cutting. The ablation range is large and the efficiency is fast. 2. Disadvantages: However, because these solutions require at least two needles to cooperate to form an ablation area, and a larger insertion area is often required when the two needles cooperate. Therefore, in this case, it is not conducive to fine ablation. Summary of the Invention

[0011] In view of this, the purpose of the present invention is to provide an insertable surgical electrode, which has a relatively thin working area (or ablation area) and a relatively wide working area, and these two working areas are smoothly connected, which can solve the technical problem that the existing electrodes cannot have both fine ablation and extensive ablation during operation.

[0012] The technical solution of the present invention is as follows: An insertable surgical electrode front-end component includes a puncture needle; a sleeve is sleeved outside the proximal end of the puncture needle; the distal end of the sleeve is a negative electrode plate perpendicular to its axis, and the working electrode is exposed between the distal end of the puncture needle and the negative electrode plate; the inside of the sleeve is isolated from the puncture needle by an insulating layer I, and the outside of the sleeve is coated with an insulating layer II; in the working state, the current movement between the working electrode and the negative electrode plate at least makes the working area of at least a section near the distal end of the working electrode gradually increase from the distal end to the proximal end.

[0013] Further, the side of the negative electrode plate facing the distal end is exposed, and the rest are sprayed with an insulating coating.

[0014] Further, the negative electrode plate is circular.

[0015] Further, the exposed area of the negative electrode plate is larger than the surface area of the working electrode.

[0016] Further, the inside of the puncture needle is hollow, liquid outlet holes are provided on its outer periphery, and a liquid inlet component is connected to the proximal end of the puncture needle.

[0017] Further, the inside of the puncture needle is hollow, and an inner liquid inlet tube is arranged therein; the proximal end of the inner liquid inlet tube is communicated with a liquid inlet assembly, a liquid return tube is arranged on the side of the puncture needle, and a liquid return channel for the cooling medium to flow through is arranged between the puncture needle and the inner liquid inlet tube, and the inner liquid inlet tube, the liquid return channel and the liquid return tube are communicated in sequence.

[0018] Further, the puncture needle is coated with an insulating layer III, and the insulating layer III extends beyond the negative electrode plate towards the distal end.

[0019] Further, it further includes a control member, and the control member is connected to the sleeve to control the movement of the negative electrode plate relative to the puncture needle on the axis.

[0020] Further, the insulating layer I, the sleeve and the insulating layer II are arranged together.

[0021] Further, in the initial state, the sleeve is arranged to cover the distal end of the puncture needle.

[0022] Further, the control member is connected with a reset assembly, and the reset assembly automatically pushes the sleeve back to the initial state.

[0023] An insertable surgical electrode includes a handle, the distal end of the handle is connected with the front-end assembly of the insertable surgical electrode described above, and the proximal end of the handle is connected with a cable plug respectively electrically connected with the puncture needle and the negative electrode plate.

[0024] Compared with the prior art, the main differences and beneficial effects of the present invention are: The acting area of the present invention from the distal end to the proximal end (which can be understood as the acting area perpendicular to the axial direction) gradually becomes larger (mainly a thinner acting area will be formed in a section near the distal end). By setting the distance between the negative electrode plate and the distal end of the working electrode, the length of the acting area is changed, which is beneficial to performing more refined ablation by using the insertion depth of the electrode. For example, if there is an irregular tumor in a deeper position of the liver and there is a smaller part that needs to be treated, then at this time, the "coarse first and then fine" treatment method can be adopted. First, insert as close as possible to the part that needs to be refined for ablation and cutting (it is recommended to leave a margin, neither ablate nor cut, and leave it for joint treatment), and then perform ablation and cutting on the part that needs to be refined (including the margin), so that the thinner acting area formed by the present invention can be fully utilized. When fine ablation is not required, the "coarse first and then fine" treatment method does not need to be adopted. For example, for superficial internal hemorrhoids or tumors, even a one-step ablation and hemostasis method can be directly adopted. In this way, the same electrode can simultaneously realize two surgical methods: fine ablation and extensive ablation. Conventionally, the negative electrode plate usually needs to be attached to non-target parts such as the back, buttocks, and thighs, while the present invention contrarily transfers the negative electrode plate directly to the target part, fully reflecting the characteristics of reverse thinking and reverse utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings. As shown in the drawings, the above and other objects, features, and advantages of the present invention will become clearer. The same reference numerals indicate the same parts in all the drawings. The drawings are not deliberately drawn to scale in actual size, and the focus is on showing the gist of the present invention.

[0026] Figure 1 Schematic diagram of the overall external shape of an electrode embodiment; Figure 2 Schematic diagram of the structure of a front-end component; Figure 3 Schematic diagram of the assembly of a front-end component; Figure 4 Schematic diagram of the structure of another front-end component; Figure 5 Schematic diagram of the internal cooling medium circulation of another front-end component; Figure 6 Schematic diagram of the structure of a handle embodiment; Figure 7 Schematic diagram of the structure of another handle embodiment; Figure 8 Schematic diagram of the use of a conventional electrosurgical knife; Figure 9 Schematic diagram of the energy action effect of a conventional electrosurgical knife; Figure 10 Schematic diagram of the energy action effect in different states under one embodiment; Figure 11 Schematic diagram of the energy action effect under another embodiment.

[0027] Reference numerals: 1 - puncture needle, 2 - first insulating layer, 3 - working electrode, 4 - cannula, 5 - negative electrode plate, 6 - second insulating layer, 7 - control member, 8 - liquid outlet hole, 9 - liquid inlet assembly, 10 - inner liquid inlet tube, 11 - return liquid tube, 12 - return liquid channel, 13 - handle, 14 - cable plug, 15 - fixing block, 16 - return spring, 17 - positioning member, 18 - long slot, 19 - third insulating layer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. The components of the embodiments of the present invention usually described and illustrated in the drawings here can be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0030] It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0031] Distal end: That is, the insertion direction of the puncture needle.

[0032] Proximal end: That is, the direction away from the insertion of the puncture needle. Embodiment 1

[0033] Refer to the attached Figure 2-3 As shown, an insertable surgical electrode front-end assembly provided by the present invention includes a puncture needle 1, which is a needle-like object having puncturing ability; a sleeve 4 is sleeved outside the proximal end of the puncture needle 1; the distal end of the sleeve 4 is a negative electrode plate 5 perpendicular to its axis, and the exposed working electrode 3 is between the distal end of the puncture needle 1 and the negative electrode plate 5, and the working electrode 3 is a part of the puncture needle 1; the sleeve 4 is isolated from the puncture needle 1 by an insulating layer 1 inside, and the sleeve 4 is coated with an insulating layer 2 outside; in the working state, the current movement between the working electrode 3 and the negative electrode plate 5 makes at least the acting area of a section near the distal end of the working electrode 3 gradually increase from the distal end to the proximal end.

[0034] Preferably, the surface of the negative electrode plate 5 facing the distal end is exposed, and the rest are sprayed with an insulating coating to ensure greater safety. According to its function, it is also feasible that the entire negative electrode plate 5 is exposed.

[0035] As another option in this embodiment, the exposed area of the negative electrode plate 5 can be larger than the surface area of the working electrode 3, which is beneficial to concentrating the energy on the working electrode 3, so that it can be applied not only to radio frequency and high-frequency hosts, but also to plasma hosts, bringing different effects. Based on this, the overall cross-sectional shape of the negative electrode plate 5 can be circular, elliptical, rectangular or other polygons. Preferably circular, refer to the attached Figure 10As shown, this is more conducive to the current movement between the working electrode 3 and the negative electrode plate 5 in the working state, forming a columnar action area similar to that with a tip, or an action area close to a hemispherical shape, which is closer to the general shape of a tumor, that is, it can achieve the effect that at least the action area of a section near the distal end of the working electrode 3 gradually increases from the distal end to the proximal end.

[0036] The materials of the puncture needle 1, the cannula 4, and the negative electrode plate 5 are conductive metal materials and their alloy materials, such as precious metals like platinum and iridium, or materials such as tungsten-based alloys, stainless steel, and titanium alloys, which can be selected according to the situation. Usually, the puncture needle 1 and the first insulating layer 2 are set together, and the cannula 4 and the second insulating layer 6 are set together, that is, the puncture needle 1 and the cannula 4 are each wrapped with insulating materials. However, in this embodiment, it is preferred to set the first insulating layer 2, the cannula 4, and the second insulating layer 6 together. No matter which of the above methods is adopted, in order to prevent the working electrode 3 from directly contacting the negative electrode plate 5, generally, a small section of the first insulating layer 2 is reserved and folded towards the distal end-facing side of the negative electrode plate 5, and the cross-sectional shape after folding is adapted to the shape of the negative electrode plate 5. That is, if the negative electrode plate 5 is circular, the cross-sectional shape after folding is also circular. The first insulating layer 2 and the second insulating layer 6 are polymer materials, such as heat shrinkable tubes, and when necessary, either or both of the first insulating layer 2 and the second insulating layer 6 can be replaced by other insulating materials such as ceramics.

[0037] Refer to the appendix Figure 6 、 10 As shown, this embodiment also provides an insertable surgical electrode, including a handle 13, the distal end of the handle 13 is connected to the front-end assembly of the above-mentioned insertable surgical electrode, and the proximal end of the handle 13 is connected to a cable plug 14 that is electrically connected to the puncture needle 1 and the cannula 4 respectively.

[0038] Since in this embodiment it is preferred to set the first insulating layer 2, the cannula 4, and the second insulating layer 6 together, it can be called an electrode rod. This can be achieved by arranging a fixing block 15 inside the handle, and then inserting the proximal end of the electrode rod into the handle 13 and fixing it with the cooperation of the fixing block 15. Here, there are many ways to fix the fixing block 15 to the electrode rod, which will not be listed one by one, such as clamping, clamping and gluing, etc. Similarly, the fixing of the puncture needle 1 can also refer to this method. However, a certain length of the puncture needle 1 and the cannula 4 needs to be reserved for the connection of the cable plug 14.

[0039] Specifically, the cable plug 14 needs to be electrically connected to the working electrode 3 and the negative electrode plate 5 respectively. Specifically, the proximal end of the puncture needle 1 can be inserted into the handle 13 and passed through the sleeve 4 and the second insulating layer 6, that is, a position for wire welding can be reserved. Similarly, the proximal end of the sleeve 4 can be exposed from the second insulating layer 6, leaving a position for wire welding. In short, the interior of the handle 13 can be set so that the proximal end of the sleeve 4 passes through the second insulating layer 6, and then the proximal end of the puncture needle 1 passes through the sleeve 4.

[0040] It should be noted that the positions of the sleeve 4, the negative electrode plate 5 and the working electrode 3 in this embodiment are fixed, and the negative electrode plate 5 will not produce relative movement with the working electrode 3. This situation is suitable for clearly knowing the depth of the target tissue to be treated, and selecting the insertable surgical electrode of appropriate specifications (such as the length, diameter of the working electrode 3, the diameter of the negative electrode plate 5, etc.) as needed. If the depth to be treated is too deep or too shallow, it cannot be perfectly adapted. In general, the length of the working electrode 3 can be set at 1-6cm, the diameter of the working electrode 3 can be set at 1-2mm, and the diameter of the negative electrode plate 5 can be set at 0.5-2cm. Of course, in some cases, the range of the above dimensions may be appropriately adjusted, and it is not absolute. Embodiment 2

[0041] Reference Figure 2-3 As shown in FIGS. 6 and 11, the main difference of this embodiment is that the puncture needle 1 is coated with an insulating layer 3 19, and the insulating layer 3 19 extends beyond the negative electrode plate 5 to the distal end. Originally, the puncture needle 1 and the negative electrode plate 5 are isolated by an insulating layer 1 2, and generally no additional insulation is required, but the addition of this extended insulating layer 3 19 here has its special purpose. After adding the insulating layer 3 19, the electrode is more suitable for ablation of deep tumors, that is, only the working electrode 3 is in contact with the target site, and the superficial part is mainly affected by the thermal effect, which has limited destructiveness to the superficial tissue and may not even cause damage, and can effectively protect the superficial normal tissue. If the working electrode 3 is slightly larger than the target site, the normal tissue will not be damaged on a large scale. On the contrary, if the working electrode 3 is slightly smaller than the target site, it can also be treated by multiple ablations. It is obviously different from the ablation effect without adding the insulating layer 13 (that is, the part corresponding to the working electrode 3 is completely ablated). It is worth noting that the negative electrode plate 3 still needs to be attached to the superficial position corresponding to the target site. Embodiment 3

[0042] Reference Figure 2-3, as shown in Figures 6 and 10, the main difference in this embodiment is that the puncture needle 1 is hollow inside, with liquid outlet holes 8 provided on its outer periphery, and a liquid inlet assembly 9 is connected to the proximal end of the puncture needle 1. Moreover, the number of the liquid outlet holes 8 can be set to multiple. If multiple, uniform distribution is preferably considered. Specifically, the liquid inlet assembly 9 includes a liquid inlet tube, and the liquid inlet assembly 9 can be fixedly installed in an interference fit with the proximal end of the puncture needle 1 through the liquid inlet tube.

[0043] The purpose of adding the liquid outlet function in this embodiment is to introduce physiological saline into the target site, reduce the temperature of the puncture needle 1, prevent sticking of the knife, and at the same time, it can also better utilize the physiological saline to enhance conductivity to expand the ablation area and improve the ablation effect. Embodiment Four

[0044] Refer to the appendix Figure 4-6 , as shown in Figures 10, the main difference in this embodiment is that the puncture needle 1 is hollow inside, and a liquid inlet inner tube 10 is provided therein; the proximal end of the liquid inlet inner tube 10 is connected to a liquid inlet assembly 9, a liquid return tube 11 is provided on the side of the puncture needle 1, and a liquid return channel 12 for the cooling medium to flow is provided between the puncture needle 1 and the liquid inlet inner tube 10, and the liquid inlet inner tube 10, the liquid return channel 12 and the liquid return tube 11 are sequentially connected.

[0045] Obviously, the diameter of the liquid inlet inner tube 10 is smaller than that of the puncture needle 1, and its material is not absolute. A metal material can be selected, or an insulating material can also be selected. Taking the stainless steel material as an example, after the liquid inlet inner tube 10 is inserted into the puncture needle 1, the opening at the proximal end between the puncture needle 1 and the liquid inlet inner tube 10 can be welded and sealed to guide the liquid in the liquid return channel 12 to flow back through the liquid return tube 11. In this scheme, a liquid return hose needs to be additionally connected to the proximal end of the liquid return tube 11, and the liquid return hose passes out from the proximal end of the handle 13.

[0046] This embodiment and Embodiment Two are two significantly different schemes. The common point of the two is that they both use a cooling medium (such as physiological saline) to reduce the temperature of the puncture needle 1, improve the phenomenon of sticking of the knife, and at the same time expand the ablation area and improve the ablation effect. The obvious difference between the two is whether liquid will be discharged to the target site. The resulting difference in effect is that in Embodiment Two, normal tissues may be scalded by the heated high-temperature physiological saline during the insertion and removal process, while this embodiment can well avoid this defect. Embodiment Five

[0047] Refer to the appendix Figure 1-5 , as shown in Figures 7 and 10, the main difference in this embodiment is that it further includes a control member 7, and the control member 7 is connected to the sleeve 4 to control the movement of the negative electrode plate 5 relative to the puncture needle 1 along the axis.

[0048] To achieve the above functions, in this embodiment, it is preferable to arrange the first insulating layer 2, the sleeve 4, and the second insulating layer 6 together, which can be referred to as the electrode rod. To prevent the working electrode 3 from directly contacting the negative electrode plate 5, generally, a small section of the first insulating layer 2 is reserved and folded towards the distal side of the negative electrode plate 5.

[0049] The control member 7 can be embodied as a dial block, which is installed in the handle 13. Specifically, the handle 13 can be divided into left and right two shells. There is a long strip hole 18 for the installation and sliding of the dial block above the two combined shells. The dial block can be clamped in the long strip hole 18, and the part of the dial block located inside the shell (equivalent to the fixed block 15) is fixed together with the electrode rod. Among them, the fixing method of the dial block and the electrode rod is diverse. For example, it can adopt a clamping method or a combination of clamping and gluing. The specific structural design will not be elaborated here.

[0050] Preferably, in the initial state, the sleeve 4 is arranged to cover the distal end of the puncture needle 1. The purpose of this is to conform to the usage habit. When the dial block is pulled back, the working electrode 3 of the puncture needle 1 is exposed. When the dial block is pushed out, the working electrode 3 of the puncture needle 1 is covered. At the same time, such a setting can also prevent unnecessary stabbing of the working electrode 3.

[0051] At this time, the insertable surgical electrode provided in this embodiment requires the operator to rely on hand strength to control the sliding of the control member 7 (i.e., the dial block) to achieve the exposure of the working electrode 3 and control the distance between the tip of the working electrode 3 and the negative electrode plate 5. In Example 1, it is mentioned that the length of the working electrode 3 can be set to 1-6cm, so the distance between the tip of the working electrode 3 and the negative electrode plate 5 should also be this length. This method of purely relying on hand strength to control the sliding of the control member 7 has a certain convenience. For example, when it is necessary to insert the target tissue for ablation and hemostasis, it is only necessary to manually push the control member 7 back to the proximal end, and then insert the exposed working electrode 3 into the target tissue. When the insertion depth is sufficient, push the control member 7 to keep the negative electrode plate 5 in full contact with the surface of the target tissue to achieve the purpose. After the treatment is completed, it can be directly pulled out. If necessary, adopt the "first coarse then fine" treatment method, that is, first insert as close as possible to the part that needs fine treatment for ablation and cutting (it is recommended to leave a margin, no ablation or cutting, and leave it for processing together), and then ablate and cut the part that needs fine treatment (including the margin), so that the finer action area formed by the present invention can be fully utilized. When fine ablation is not required, it is not necessary to adopt the "first coarse then fine" treatment method. For example, for superficial internal hemorrhoids or tumors, even a one-step ablation and hemostasis method can be directly adopted. Of course, it is also impossible to directly exclude irregular shapes such as internal hemorrhoids or tumors. If you want to retain normal tissue as much as possible, use the "first coarse then fine" treatment method. In this way, the same electrode can simultaneously achieve both fine ablation and extensive ablation. In particular, the shape of the tumor is generally close to a sphere, which is closer to the shape of the action area of ​​the present invention. Therefore, this structural design is more compatible with both fine ablation and extensive ablation, and can also damage normal tissue as little as possible during operation. It should be noted that the reason why the present invention is compatible with both fine ablation and extensive ablation is due to the structural design of the working electrode and the negative plate, which results in a special action area when working. When fine and extensive ablation is required, the ablation area of ​​the distal part is more utilized. When only extensive ablation is considered, there is no need to consider its special action area. Generally speaking, a single ablation only takes a few seconds, and even if you need to use hand power to push the control part 7 during the process, it is not strenuous, and the negative plate 5 only needs to be in full contact with the surface of the target tissue, and it does not need to be too hard. This method of using the hand to push the control part 7 to keep the negative plate 5 in full contact with the surface of the target tissue has another advantage, which is that it is not affected by the rebound or shaking of the target tissue.

[0052] Certainly, as a further improvement, a limiting step or the like can be provided at the long slot 18 on the basis of this embodiment to limit the position of the shifting block in different gears, so as to control the distance between the tip of the working electrode 3 and the negative electrode plate 5, thereby making the hand more relaxed without having to keep the state of pushing the control member 7 all the time. Although this solution can be used as an alternative, it may not be advisable from a clinical perspective. The reason is that the time of a few short seconds is relatively short. After adding this limiting structure, the operator needs to operate frequently in a short time, increasing the surgical burden. For example, if it is necessary to adjust the insertion depth of the working electrode 3, it is necessary to first confirm the required insertion depth and then adjust the position of the controller 7. Otherwise, it may not be possible to perform ablation hemostasis at the specified precise position and the position of the controller 7 needs to be adjusted again. Although the position of the shifting block can be limited in different gears, it is still difficult to avoid the problem of insufficient precision brought by each gear. Therefore, there are many prior arts that can implement the solution of the limiting structure, and it is not the optimal choice of the present invention, so it will not be elaborated here.

[0053] Alternatively, a reset assembly is provided at the control member 7. The reset assembly includes a reset spring 16 and a positioning member 17. The reset spring 16 is disposed inside the handle 13. The connection here can be a direct connection or an indirect connection, and its purpose is to return the sleeve 4 to the position in the initial state or make the sleeve 4 have a tendency to return to the position in the initial state. Such a setting is for the operator to save more effort, and there are also many implementation methods. For example, a positioning member 17 for the reset spring 16 is provided inside the handle 13, one end of the reset spring 16 is fixed on the positioning member 17, and the other end of the reset spring 16 is connected to the control member 7, so that when the reset spring 16 returns to the natural state, the negative electrode plate 5 completely covers the working electrode 3. Obviously, the solution of adding the reset spring 16 can assist the operator. When necessary, the hand force can still be directly used to keep the negative electrode plate 5 in full contact with the target tissue or adjust the distance between the tip of the working electrode 3 and the negative electrode plate 5.

[0054] In addition, preferably, the present invention controls the movement of the negative electrode plate 5 relative to the puncture needle 1 along the axis by means of the control member 7 (i.e., the first insulating layer 2, the sleeve 4 and the second insulating layer 6 are integrated as a whole), so as to drive the change of the distance between the negative electrode plate 5 and the distal end of the working electrode 1, thereby adjusting the working area of the electrode. It does not exclude others from directly controlling the movement of the puncture needle 1 along the axis by means of the control member 7, so as to drive the change of the distance between the negative electrode plate 5 and the distal end of the working electrode 1, thereby adjusting the working area of the electrode. However, this method of directly controlling the movement of the puncture needle 1 along the axis may not only cause the design position of the control member 7 to change, affecting the operator's operation experience, but the biggest drawback is that this solution is equivalent to making the puncture needle 1 movable. When the operator performs insertion ablation hemostasis, more force is required to ensure the stability of the insertion, and the insertion depth is also more difficult to grasp. If this laborious problem needs to be solved, many structural designs need to be added, which is not worth the loss. Instead, simple problems are complicated, which does not meet the purpose of cost reduction and efficiency increase of the enterprise.

[0055] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification made within the spirit and principle of the present invention, such as equivalent replacement, function superposition, etc., shall be included in the protection scope of the present invention.

Claims

1. An insertable surgical electrode front-end assembly, characterized in that, Comprising a puncture needle (1); an outer sleeve of the proximal end of the puncture needle (1) is provided with a cannula (4); a distal end of the cannula (4) is a negative electrode plate (5) perpendicular to its axis, and a working electrode (3) is exposed between the distal end of the puncture needle (1) and the negative electrode plate (5); the inside of the cannula (4) is isolated from the puncture needle (1) by an insulating layer I (2), and the outside of the cannula (4) is coated with an insulating layer II (6); in the working state, the current movement between the working electrode (3) and the negative electrode plate (5) at least causes the acting area of at least a section near the distal end of the working electrode (3) to gradually increase from the distal end to the proximal end.

2. The front-end assembly of an insertable surgical electrode according to claim 1, wherein One side of the negative electrode plate (5) facing the distal end is exposed, and the rest of the parts are sprayed with an insulating coating.

3. The insertable surgical electrode according to claim 1, wherein, The negative electrode plate (5) is circular.

4. The front-end component of an insertable surgical electrode according to claim 1, characterized in that, The puncture needle (1) is hollow inside, and liquid outlet holes (8) are provided on its outer periphery, and a liquid inlet assembly (9) is connected to the proximal end of the puncture needle (1).

5. The front-end component of an insertable surgical electrode according to claim 1, characterized in that, The puncture needle (1) is hollow inside, and a liquid inlet inner tube (10) is arranged therein; the proximal end of the liquid inlet inner tube (10) is connected to a liquid inlet assembly (9), a liquid return tube (11) is provided on the side of the puncture needle (1), and a liquid return channel (12) for the cooling medium to flow through is provided between the puncture needle (1) and the liquid inlet inner tube (10), and the liquid inlet inner tube (10), the liquid return channel (12) and the liquid return tube (11) are connected in sequence.

6. The front-end assembly of an insertable surgical electrode according to claim 1, characterized in that, The puncture needle (1) is coated with an insulating layer III (19), and the insulating layer III (19) extends beyond the negative electrode plate (5) towards the distal end.

7. An insertable surgical electrode front-end assembly according to any one of claims 1-6, characterized in that, It further comprises a control member (7), and the control member (7) is connected to the cannula (4) to control the movement of the negative electrode plate (5) relative to the puncture needle (1) on the axis.

8. The front-end assembly of an insertable surgical electrode according to claim 7, wherein The insulating layer I (2), the cannula (4) and the insulating layer II (6) are arranged together.

9. The front-end assembly of an insertable surgical electrode according to claim 6, wherein In the initial state, the cannula (4) is arranged to cover the distal end of the puncture needle (1), and the control member (7) is connected with a reset assembly.

10. An insertable surgical electrode, characterized in that, Comprising a handle (13), the distal end of the handle (13) is connected with a front-end assembly of an insertable surgical electrode according to any one of claims 1-9, and the proximal end of the handle (13) is connected with a cable plug (14) electrically connected to the puncture needle (1) and the cannula (4) respectively.

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