Plasma microelectrode

Abstract

The utility model belongs to the technical field of medical instruments, and discloses a plasma microelectrode and an operation system thereof, which comprise a handle, a cable plug is arranged at the near end of the handle, and a front end assembly is arranged at the front end of the handle through a fixing piece. The front end assembly comprises a heat shrink tube, a loop electrode steel tube, a supporting tube and an electrode wire which are sequentially arranged from outside to inside. The part, extending out of the heat shrink tube towards the far end, of the loop pole steel tube forms a loop pole, and the far end of the loop pole is provided with a working pole in an isolated mode through an insulating column. The working electrode comprises a first electrode and a second electrode, and the first electrode and the second electrode are respectively connected with the electrode wire; and at least one side of the second pole exceeds the first pole, and a concave part is formed. According to the utility model, the technical problem that the practicability and the convenience of various operations (such as digging, shifting, drawing and the like) of the existing microelectrode in the ear endoscopic surgery are poor is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical equipment, and in particular relates to a plasma microelectrode and a surgical system thereof. Background Art

[0002] In recent years, the development of high-definition cameras and high-quality optical components has led to the application of otoscope surgery in middle ear, inner ear and lateral skull base surgeries, forming a complete otoscope surgery technology system. Otoscopes mainly expose lesions through natural channels and have unique minimally invasive incisions; their cone-shaped field of view is wider than that of microscopes, so they have more advantages when observing deep structures; their wide-angle field of view can also effectively reduce bone grinding and preserve normal structures as much as possible. However, otoscopes also have obvious disadvantages. The first is the problem of one-handed operation. When cleaning lesions, especially delicate operations, one-handed operation is obviously inferior to two-handed operation; in addition, the anatomical structures related to ear surgery are located deeper and are surrounded by dense important nerves and blood vessels, which is different from rhinology and pharyngeal otoscope surgery. The natural channel of the external auditory canal through which otoscope surgery passes is a bone structure, narrow and limited in expansion range, and cannot accommodate more surgical instruments for simultaneous operation. In addition, in the narrow and long cavity, bleeding has a greater adverse effect on the surgical field of view, so this is also an important bottleneck restricting the widespread development of otoscope surgery.

[0003] At present, the most popular method for otological endoscopic surgery is the continuous perfusion mode of otological endoscopic surgery. First of all, the incision bleeding under traditional otological endoscopy and the small amount of bleeding inside the middle ear tympanic cavity can be better controlled under the continuous perfusion otological endoscopic surgery mode, which solves the impact of general bleeding on endoscopic surgery. However, it is still difficult to overcome the bleeding of small arteries and extensive inflammation and granulation of the inner wall of the tympanic cavity. For such bleeding, the perfusion effect of a certain pressure still cannot guarantee a clear field of vision under endoscopy. The solution is to use hemostatic energy equipment to stop bleeding or switch to non-perfusion mode for adrenal cotton ball compression hemostasis. Secondly, otological endoscopic surgery requires sufficient space and field of vision, especially in the process of underwater bone grinding. Continuous perfusion will cause some ear canal flaps and tympanic membranes to float disorderly, which will compress the surgical field of view, affect the surgical operation, and may also cause the risk of ear canal flaps being rolled off by electric drills. This requires that the treatment of ear canal flaps and tympanic membranes in continuous perfusion mode surgery should be more stable, reliable, safe and reasonable.

[0004] In order to further improve the surgical process of the continuous perfusion mode under ear endoscopy, we have developed and designed a flushing sheath suitable for ear endoscopes; in order to solve the problem of intraoperative bleeding (if obvious arterial bleeding is encountered during surgery, the visual field may still be temporarily blurred), a plasma knife head specially adapted for underwater hemostasis operations has also been developed, and the trial results are satisfactory. Since almost all operations are performed in circulating saline in the perfusion mode, the saline inlet and outlet pipes that traditional plasma knife heads must carry can be omitted, thereby achieving a slimmer knife head. For the first time, the ear canal, which was previously difficult to operate with a plasma knife head, has been transformed into an area that can be flexibly operated, realizing the unification of cutting and hemostasis functions, making ear endoscopy surgery safer.

[0005] The Chinese patent application with the prior patent application number 202011099636.8 discloses a technical solution of continuous perfusion mode. Compared with the existing technology, its treatment effect is significantly improved, but it still has the following shortcomings, such as:

[0006] 1. The work is extremely simple and the accuracy is relatively fixed, which cannot adapt to more complex and diverse accuracy requirements;

[0007] 2. Under this size condition, the electrode is flattened and there is no depression on the electrode surface, so operations such as digging, plucking, and digging are still a bit clumsy. Utility Model Content

[0008] The utility model aims to provide a plasma microelectrode and a surgical system thereof, so as to solve the technical problem that various operations (such as digging, pulling, digging, etc.) of the existing microelectrode in ear endoscopic surgery are not practical and convenient.

[0009] The technical solution adopted by the utility model is as follows:

[0010] The utility model provides a plasma microscopic electrode, comprising a handle, wherein a cable plug is arranged at the proximal end of the handle, a front end component is arranged at the front end of the handle through a fixing piece, and the front end component comprises a heat shrink tube, a return pole steel tube, a support tube and an electrode wire which are arranged in sequence from the outside to the inside; the part of the return pole steel tube extending out of the heat shrink tube to the far end forms a return pole, and a working pole is arranged at the far end of the return pole through an insulating column for isolation; the working pole comprises a first pole and a second pole, and the first pole and the second pole are respectively connected to the electrode wire; at least one side of the second pole exceeds the first pole, and cooperates with the first pole to form a recessed part.

[0011] Furthermore, the first pole is in a sheet shape, and the second pole surrounds the first pole to form a double-layer structure.

[0012] Furthermore, the first electrode is an electrode sheet or a sheet electrode formed by winding an electrode wire and then flattening it, and the second electrode is an electrode formed by winding an electrode wire and then flattening it.

[0013] Furthermore, the first electrode and the second electrode are both in sheet form, and the second electrode and the first electrode form a double-layer structure in parallel.

[0014] Furthermore, the first electrode and the second electrode are both electrode sheets, or both are sheet electrodes formed by winding electrode wires and then flattening, or one of them is an electrode sheet and the other is a sheet electrode formed by winding electrode wires and then flattening.

[0015] Furthermore, after the second electrode extends out of the insulating column, it forms a single-layer structure with the first electrode.

[0016] Furthermore, the insulating column and the loop pole steel pipe form a bent structure, and the second pole is located on the inner side of the bent structure.

[0017] Furthermore, at least one side of the second pole exceeds the first pole, thereby expanding the effective area of ​​the working pole.

[0018] Furthermore, the bending structure includes at least two types:

[0019] Type A: The loop pole steel pipe is of natural bending type;

[0020] Type B: The loop pole steel pipe is connected to the insulating column in a bent manner.

[0021] Furthermore, the first pole and the second pole are both axisymmetric structures, and the distal ends of both are arc-shaped.

[0022] The utility model provides a low-temperature plasma surgical system with controllable ablation range, comprising

[0023] An ear endoscope unit, used to insert an ear endoscope into the ear to observe the surgical operation area;

[0024] A liquid injection unit, used to inject electrolyte into the surgical operation area;

[0025] The microscopic low-temperature plasma unit uses a plasma microelectrode to convert low-frequency radio frequency energy into an electrolyte and apply a thin layer of plasma to the surgical operation area for coagulation and cutting;

[0026] Suction unit, used to suck out the waste liquid produced after coagulation and cutting.

[0027] In summary, compared with the prior art, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0028] The utility model removes the salt water inlet and outlet pipes that the traditional plasma electrode must carry, and can minimize the size of the plasma electrode to reserve enough space for the operator to operate the operation. A second pole is added, and after the second pole extends out of the insulating column, at least one side of the second pole exceeds the first pole. The concave part formed by the second pole and the first pole is more conducive to operations such as digging, pulling, and digging, which effectively improves the practicality and convenience. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is the overall schematic diagram of the microelectrode;

[0030] Figure 2 It is a schematic diagram of the surgical system;

[0031] Figure 3 It is a cross-sectional view of the microscopic working pole structure;

[0032] Figure 4 It is a cross-sectional view of the proximal structure of the microelectrode;

[0033] Figure 5 This is a schematic diagram of the external structure of the microelectrode Figure 1 ;

[0034] Figure 6 This is a schematic diagram of the external structure of the microelectrode Figure 2 ;

[0035] Figure 7 1 is a schematic diagram of the structure of the far end face of the insulating column;

[0036] Figure 8 This is a first embodiment of the arrangement of the first pole and the second pole;

[0037] Fig. 9 This is a second embodiment of the arrangement of the first pole and the second pole;

[0038] Fig.10 This is a third embodiment of the arrangement of the first pole and the second pole.

[0039] Reference numerals:

[0040] 1-otoscope, 2-low-temperature plasma microelectrode, 3-suction tube;

[0041] 11-fiber optic interface, 12-mirror sheath, 13-lens, 14-water inlet, 15-water inlet valve;

[0042] 21-handle, 22-front end assembly, 23-working pole, 24-cable plug, 25-control assembly;

[0043] 211-handle fixing piece;

[0044] 220-loop electrode steel tube, 221-loop electrode, 222-insulating column, 223-heat shrink tube, 224-electrode wire, 225-support tube;

[0045] 2221-first polar hole, 2222-second polar hole, 2223-cavity;

[0046] 234-first pole, 232-second pole, 233-recessed part;

[0047] 251-jacket, 252-support rod, 253-pushing key, 254-fixing block, 255-reset spring, 256-reset key, 257-limiting hole.

[0048] →: Water flow direction. DETAILED DESCRIPTION

[0049] All features disclosed in this specification, except mutually exclusive features and / or steps, can be combined in any manner.

[0050] Here is a brief explanation or definition of the relevant terms:

[0051] Surgical operating area: the collection of all locations through which surgical instruments and electrolytes can pass.

[0052] Low-temperature plasma microelectrode: that is, the electrode without water inlet and water absorption structure, which is made into a structure and size that meets the requirements of high-precision surgery. After being connected to the low-temperature plasma host, it can convert the low-frequency radio frequency energy into electrolyte and apply the plasma thin layer generated by it to the surgical operation area for coagulation and cutting.

[0053] Microscopic low-temperature plasma unit: a plasma unit that uses a low-temperature plasma microelectrode.

[0054] Micro-low-temperature plasma surgery system: a surgery system that uses low-temperature plasma micro-electrodes in conjunction with surgery.

[0055] Distal end: refers to the end closer to the area to be treated during surgery.

[0056] Proximal: refers to the end closer to the surgeon during surgery.

[0057] Width: refers to the length of the front end assembly and the working pole in the direction of the steel pipe diameter.

[0058] Length: refers to the maximum distance between the working pole and the insulating column.

[0059] Left side: refers to the left side from the proximal end to the distal end when looking down at the working pole plane.

[0060] Right side: refers to the right side from the proximal end to the distal end when looking down at the working pole plane.

[0061] The utility model is described in detail below in conjunction with the accompanying drawings. Example

[0062] like Figure 1 , Figures 3 to 10 As shown, the utility model provides a plasma microscopic electrode 2, comprising a handle 21, wherein a cable plug 24 is provided at the proximal end of the handle 21, and a front end assembly is provided at the front end of the handle 21 through a fixing member 211, wherein the front end assembly comprises a heat shrink tube 223, a return pole steel tube 220, a support tube 225 and an electrode wire 224 which are arranged in sequence from the outside to the inside; the portion of the return pole steel tube 220 extending out of the heat shrink tube 223 to the distal end forms a return pole 221, and a working pole 23 (i.e., a portion exposed outside the insulating column 222) is provided at the distal end of the return pole 221 in isolation through an insulating column 222; the working pole 23 comprises a first pole 234 (i.e., a main electrode) and a second pole 232 (i.e., a secondary electrode), wherein the first pole 234 and the second pole 232 are respectively connected to the electrode wire 224; at least one side of the second pole 232 exceeds the first pole 234, and cooperates with the first pole 234 to form a recessed portion 233.

[0063] like Figure 8 As shown, the first pole 234 is in sheet shape, and the second pole 232 surrounds the first pole 234 and forms a double-layer structure (double-layer structure refers to the case where the plane where the active pole 232 is located exceeds the plane where the fixed pole 234 is located). The first pole 234 is an electrode sheet or a sheet-shaped electrode formed by winding the electrode wire 224 and then flattening it, and the second pole 232 is an electrode formed by winding the electrode wire 224 and then flattening it. At this time, the concave part 233 is formed by the cooperation of the second pole 232 and the first pole 234.

[0064] One of the specific implementations may be:

[0065] The width of the front end component 22 and the working pole 23 is less than or equal to 2 mm, wherein the width of the front end component 22 (including the insulating column 222) and the working pole 23 (mainly referring to the working pole part) is preferably 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, and the width of the working pole 23 is slightly smaller than the width of the front end component 22, so as to ensure that the dimensions of the steel pipe, insulating column, working pole, etc. after insulation treatment meet the requirements of ear endoscopic surgery, which can improve the precision of the surgery.

[0066] Preferably, the side surface of the insulating column 222 has a gradual design, that is, it gradually becomes thinner from the proximal end to the distal end, and can also be sharpened to achieve the above purpose, so as to be more conducive to maintaining a good surgical field of view.

[0067] The distal end surface of the insulating column 222 is provided with two rows of holes, namely two second pole holes 2222 on the upper side and one first pole hole 2221 on the lower side. The first pole hole 2221 and the second pole hole 2222 are only used to penetrate the corresponding first pole 234 and the second pole 232. The first pole 234 and the second pole 232 are fixed and cannot be retracted when in use.

[0068] After the electrode wire 224 is wound and formed, it will be flattened (including polishing and burr removal if necessary) to increase the surface area of ​​the wire plane and increase its sharpness, so that the energy can be more concentrated on the sharper blade, and the cutting and solidification will be faster.

[0069] In one embodiment, the front end assembly 22 is a steel tube or other metal tube with good electrical conductivity, and the outer surface of the steel tube is insulated by a heat shrink tube 223 or other insulation methods.

[0070] When the working pole 23 is arranged on the end face of the insulating column 222, the working pole 23 forms an angle α (not shown in the figure) with the end face of the front end of the front end assembly 22, and the angle α satisfies: 0°<α≤90°, and the preferred angle is: 30°≤α≤90°.

[0071] like Figures 8-10 As shown, the explanation about at least one side of the second pole 232 exceeding the first pole 234 is: that is, the second pole 232 can be beyond the left side, right side, far end, or between the left side and the far end, or between the right side and the far end, or exceed any three adjacent sides mentioned above at the same time, or exceed all of them at the same time, etc.

[0072] The insulating column 222 and the return pole steel tube 220 form a bending structure, and the bending angle β satisfies: 0°<β≤180°. The second pole 232 is located inside the bending structure, that is, between the bending angles β. This bending structure is more conducive to the aforementioned cutting, solidification, digging, and pulling operations.

[0073] The bending structure includes at least two types:

[0074] Type A: The loop pole steel tube 220 is a naturally bent type; in this type, the loop pole steel tube 220 is naturally bent into a required angle.

[0075] Type B: The loop pole steel tube 220 and the insulating column 222 are connected in a bending type; in this type, the loop pole steel tube 220 and the insulating column 222 are directly clamped and fixed at a required angle, and the loop pole steel tube 220 is not naturally bent.

[0076] When the front end of the front end assembly 22 is a bent structure, the distance between the front end of the working pole and the farthest side of the steel pipe should be maintained between 1.5 mm and 4 mm, preferably 2 mm, 2.5 mm and 3 mm. This size can ensure that the ear endoscope surgery will not be affected by its bent structure.

[0077] The maximum length of the working electrode 23 is less than or equal to 1.5 mm, preferably 0.85 mm and 1 mm. Here, the working electrode 23 adopts an electrode wire 224 with a diameter of about 0.2 mm. Ear endoscopic surgery not only has high requirements for precision, but also requires cutting, coagulation, digging, and pulling operations on the target area. In addition to the low-temperature plasma microelectrode itself that can quickly cut, ablate, and coagulate to stop bleeding, in order to cooperate with the injection unit, the suction unit, etc. to eliminate defects that affect the field of vision, ear endoscopic surgery can also use its own structural characteristics to perform surgical actions such as digging, pulling, and digging, and remove the waste generated by the ear endoscopic surgery so that it can be sucked out of the body with the saline solution.

[0078] The first pole 234 and the second pole 232 are both axially symmetrical structures, and the distal ends of both are arc-shaped. This design is mainly to make the energy relatively more concentrated at the distal end, reducing the risk of the working pole 23 breaking from the middle or the whole piece. At the same time, this design can also make the ablation accuracy of the working pole 23 variable, providing a more flexible surgical operation space.

[0079] like Figure 2 As shown, the utility model provides a low-temperature plasma surgery system, including

[0080] An ear endoscope unit, used for inserting an ear endoscope 1 into the ear to observe the surgical operation area;

[0081] An injection unit, used to inject electrolyte (such as saline) into the surgical operation area;

[0082] The microscopic low-temperature plasma unit applies a thin layer of plasma generated by low-frequency radio frequency energy conversion electrolyte to the surgical operation area for coagulation and cutting through the plasma microelectrode 2;

[0083] Suction unit, used to suck out the waste liquid produced after coagulation and cutting.

[0084] The injection unit (not shown in the figure as a whole) includes a liquid storage part, the hose of the liquid storage part is connected to a sheath 12 through a peristaltic pump, and the sheath 12 is arranged on the ear endoscope 1. A water inlet 14 is provided on the sheath 12, and the water inlet 14 is connected to the hose. The water inlet 14 is provided with a water inlet valve 15 to control the speed and on-off of water inlet. The ear endoscope 1 itself is provided with an optical fiber interface 11, and the ear endoscope 1 is provided with a lens 13 through a mirror rod. The lens 13 is connected to the optical fiber interface 11 through the optical fiber in the mirror rod, and the optical fiber interface 11 can be connected to an external display device through an optical fiber. The above-mentioned sheath 12 is arranged outside the mirror rod to facilitate the delivery of physiological saline into the ear along with the ear endoscope 1.

[0085] The peristaltic pump provides power for the electrolyte perfusion, so that physiological saline is continuously pumped into the sheath 12 at a certain pressure and flow rate, and then poured into the surgical operation area through the sheath 12, providing electrolyte for the low-temperature plasma microelectrode, which is beneficial for it to convert the low-frequency radio frequency energy into a thin layer of plasma generated by the electrolyte and apply it to the surgical operation area for coagulation and cutting.

[0086] In one embodiment, the suction unit is a suction tube 3 connected to a suction device, and the suction tube 3 is directly placed in the concha cavity for suction.

[0087] Furthermore, the microscopic low-temperature plasma unit (not shown in the figure as a whole) includes

[0088] A low-temperature plasma main unit, and a low-temperature plasma microelectrode 2 and accessories connected thereto, wherein the accessories include a foot switch, etc.

[0089] The system uses a low-temperature plasma host to generate low-frequency radio frequency energy, which acts on a physiological saline environment through a low-temperature plasma microelectrode 2 to generate a thin plasma layer. The system's operating mode can be changed by a foot switch, such as cutting ablation and coagulation hemostasis.

[0090] The utility model applies a brand-new otoscope surgical operation mode, which makes up for the defects of otoscope surgery and makes otoscope surgery clearer, simpler and smoother. In this mode, the operator puts the otoscope sheath on the handheld otoscope, and can continuously pump physiological saline into the sheath at a certain pressure and flow rate. In this way, almost all operations under the otoscope will be carried out in the constantly exchanged physiological saline. A small amount of bleeding and bone powder produced during the operation will be flushed out by the running water with a certain pressure, and will be sucked out in time by the suction tube placed in the concha cavity, so as to always keep the lens clean and the surgical field clear, greatly improving the fluency and safety of the operation.

[0091] This mode makes full use of the narrow operating channel of the otoscope. The continuous flow of physiological saline in the narrow space can quickly flush blood, bone powder and other dirt that affect the field of vision out of the surgical cavity with a certain pressure and flow rate. The underwater otoscope mirror can always remain clear, avoiding the trouble of repeatedly wiping the lens with the traditional method. There is no need to use a suction device in the surgical operation area, which makes the operating space for other instruments more sufficient.

[0092] This mode can be widely used in lateral skull base surgeries such as endoscopic eardrum repair surgery, endoscopic ear canal tympanoplasty, endoscopic eardrum facial nerve decompression, and total eardrum endoscopic trans-canal-promontory vestibular schwannoma resection. In clinical practice, the utility model combines the microscopic low-temperature plasma unit 2 with this mode, which can well solve the following problems:

[0093] 1. In case of obvious arterial bleeding, the water flow will not have enough time to wash away the red blood cells, and the clarity of the visual field under the otoscope will still be affected to a certain extent. For the field of ear microsurgery and lateral skull base surgery, it may affect the precision of the operation.

[0094] 2. When the flushing needs to be stopped for a period of time due to other operations during the operation, when entering the surgical cavity again, there are often many blood clots adhered to the surgical field, which cannot be removed by flushing and must be grasped with other instruments, thus affecting the overall smoothness of the operation.

[0095] 3. After conventional ear microsurgery instruments cut flaps and clamp lesions, the irregular soft tissue at the edge of the local wound will often float in the running water in this mode, which will have a certain degree of adverse effect on the surgical field and operation.

[0096] 4. Due to the narrow operating space, the hemostatic devices currently used in clinical practice cannot meet the needs of delicate otologic endoscopic surgery.

[0097] The principle of low-temperature plasma radiofrequency ablation technology is to use low-frequency radiofrequency energy to convert electrolyte (such as saline) to form a thin plasma layer between the plasma electrode and the target tissue. The charged particles in the plasma dissociate the molecular bonds in the target tissue under the acceleration of the electric field, thereby achieving the effect of tissue coagulation, necrosis and cutting. Since the plasma electrode and the target tissue are not in direct contact, but are indirectly cut by the plasma thin layer, and the electrolyte continuously flushes the low-temperature plasma microelectrode, its operating temperature is only 40~70℃, which is much lower than that of bipolar electrocoagulation and other equipment of electric knife. Due to its advantages of low-temperature cutting and simultaneous electrocoagulation and hemostasis, plasma electrodes are widely used in otolaryngology and head and neck surgery. Among them, the more mature ones are adenoid ablation and tonsillectomy in the throat, as well as minimally invasive surgery for head and neck, nasal cavity and paranasal sinus tumors, which have received attention in the past decade.

[0098] The plasma electrodes commonly used for cutting, ablation and hemostasis currently require flushing and suction tubes to provide ion solutions. Therefore, they are relatively large in size, with the thinnest diameter exceeding 3.5 mm, which is almost equivalent to the diameter of the external auditory canal and cannot meet the needs of delicate ear surgery operations.

[0099] The utility model is a new system and new mode produced by combining the microscopic low-temperature plasma unit 2 with this mode. Almost all operations are carried out in circulating physiological saline, so that the saline water inlet and outlet pipes that the traditional plasma electrode must carry can be removed, thereby providing a basis for realizing the micronization of the plasma electrode (that is, while reducing the size, it can ensure that it can normally excite plasma in the surgical environment). Therefore, the utility model designs the plasma electrode in this mode into a shape suitable for operation in a narrow ear canal by micronizing it, and combines it with an ear endoscope to form a new ear endoscope surgery microscopic low-temperature plasma surgery system. This surgical system transforms the area where it was difficult to operate the plasma electrode in the past into an area that can be flexibly operated, realizes the unification of cutting and hemostasis functions, and further upgrades from simple passive flushing to keep the surgical field clear to active hemostasis plus passive flushing double insurance mode, so that ear endoscope surgery has a safer guarantee, a clearer and more beautiful field of view, and also contributes to the further improvement and development of the ear endoscope surgery system. Example

[0100] like Fig. 9 As shown, the main difference between this embodiment and other embodiments is that the first pole 234 and the second pole 232 are both in sheet shape, and the second pole 232 extends out of the insulating column 222 to form a double-layer structure parallel to the first pole 234 .

[0101] The first electrode 234 and the second electrode 232 are both electrode sheets, or both are sheet electrodes formed by winding electrode wires and then flattening, or one of them is an electrode sheet and the other is a sheet electrode formed by winding electrode wires and then flattening.

[0102] Furthermore, the second pole 232 is provided with a recessed portion 233 to facilitate operations such as digging, pulling, and pulling. Example

[0103] like Fig.10 As shown, the main difference between this embodiment and other embodiments is that after the second pole 232 extends out of the insulating column 222 , it forms a single-layer structure with the first pole 234 .

[0104] The first pole 234 is in sheet shape, and the second pole 232 extends out of the insulating column 222 to form a double-layer structure surrounding the first pole 234. The first pole 234 is an electrode sheet or a sheet electrode formed by winding the electrode wire 224 and then flattening it, and the second pole 232 is an electrode formed by winding the electrode wire 224 and then flattening it. At this time, a recessed portion 233 may also be provided, and the recessed portion 233 may be provided by the first pole 234 itself. Example

[0105] like Figure 1 , 4 As shown in Figure 6, the main difference between this embodiment and other embodiments is that the handle 21 is provided with a control component 25 for controlling the support tube 225 to make reciprocating motion along the axial direction of the return pole steel tube 220, and the return pole steel tube 220 drives the active pole 232 to extend or retract the insulating column 222.

[0106] The control component 25 includes

[0107] A jacket 251, wherein the jacket 251 is disposed inside the handle 21 and clamps the support tube 225;

[0108] A push button 253, which is disposed at the proximal end of the handle 21 and connected to the jacket 251;

[0109] A fixing block 254, wherein the fixing block 254 is disposed inside the handle 21;

[0110] A return spring 255, wherein the return spring 255 is connected between the jacket 251 and the fixing block 254;

[0111] A limiting hole 257, wherein the limiting hole 257 is provided on the handle 21 to limit an extended position and a retracted position of the second pole 232;

[0112] A support rod 252, one end of which is fixed to the jacket 251, and the other end of which is clamped in the limiting hole 257 to limit the extended position and the retracted position of the second pole 232;

[0113] The reset button 256 is disposed at the proximal end of the handle 21 to push the support rod 252 out of the limiting hole 257 and reset the second pole 232 to the retracted position under the action of the reset spring 255. In this way, the second pole 232 is a movable pole and the first pole 234 is a fixed pole.

[0114] The control assembly 25 can be implemented in various ways. The present invention is only one of the implementations provided to extend or retract the second pole 232 , and other implementations will not be described in detail.

[0115] The support tube 225 may be a PI tube, or other materials with a certain hardness, so as to ensure that the second pole 232 can be extended and retracted, and also ensure safety and increase service life.

[0116] The insulating column 222 has a cavity 2223 for the support tube 225 to move, and the diameter of the cavity 2223 is slightly larger than the diameter of the support tube 225, so that the support tube 225 can extend into the insulating column 222 and meet the conditions for driving the second pole 232 to extend and retract. The cavity 2223 is connected to the second pole hole 2222.

[0117] The distal end surface of the insulating column 222 is provided with two rows of holes, namely, two second pole holes 2222 on the upper side and one first pole hole 2221 on the lower side. The apertures of the two second pole holes 2222 on the upper side are larger than the diameter of the corresponding second pole 232, and when in use, the second pole 232 can be fully extended or retracted into the second pole holes 2222. The lower first pole hole 2221 is only used to penetrate the first pole 234, which is fixed and cannot be retracted when in use.

[0118] 1. A plasma microelectrode

[0119] The main difference: the saline inlet and outlet pipes that traditional plasma electrodes must carry are removed, which can minimize the size of the plasma electrode to reserve sufficient surgical operation space for the operator. The electrode wire is wrapped by a support tube, and the axial reciprocating motion of the support tube drives the second pole to extend or retract the insulating column, that is, the extension or retraction of one of the working poles is controlled separately, which is different from the conventional working pole and loop pole (that is, the electrode as a whole) extending or retracting as a whole. After the second pole extends out of the insulating column, at least one side exceeds the first pole, which can effectively expand the range of action of the working pole when needed, facilitate flexible control of the ablation range, and effectively improve practicality. The recessed area formed after the second pole exceeds the first pole is more conducive to operations such as digging, pulling, and digging, which effectively improves the convenience.

[0120] Explanation of creativity:

[0121] The patent application with application number 202011099636.8 mentioned in the background technology has the same technical field, is the most similar to the technical problems, technical effects or uses to be solved, discloses the most prior art features, and is the closest prior art.

[0122] The main technical features that distinguish the present invention from the others are: see the description of the main differences above. Based on the above main technical features, the technical problem that the present invention essentially solves is how to improve the practicality and convenience of various other operations (such as digging, pulling, digging, expanding the ablation range, etc.) while ensuring the refined electrocoagulation operation.

[0123] The technical features described in the above main differences are not a simple combination, but support each other in function and have an interactive relationship. If any one of them is removed alone, the technical problem to be solved by the utility model cannot be achieved. Moreover, there is no prior art that discloses the above technical solution to solve the technical problem and achieves its corresponding technical effect. Compared with the prior art, it is non-obvious, has substantial characteristics and significant progress, and meets the requirements of the utility model on creativity.

[0124] 2. A low-temperature plasma surgical system with controllable ablation range

[0125] The utility model applies an ear endoscope, an injection unit, a microscopic low-temperature plasma unit and a suction unit as a whole to ear endoscopic surgery, which not only retains the advantages of the original surgical system but also makes up for the shortcomings of the original surgical system.

[0126] The advantages of the original surgical system are as follows:

[0127] 1. The low-temperature plasma microscopic electrode is an independent electrode. Since it is separated from the injection unit and the suction unit, it can be made into a microscopic instrument to improve the precision of the surgery, which is different from the low-temperature plasma electrode commonly used in this department;

[0128] 2. The injection unit is independent of the plasma electrode, providing a basis for the microscopy of the plasma electrode. Since the injection unit can inject electrolyte (such as saline) into the ear, the low-temperature plasma microelectrode and system can play the role of converting low-frequency radio frequency energy into a thin layer of plasma generated by the electrolyte and applying it to the surgical operation area for coagulation and cutting. This solves the technical problem that the low-temperature plasma electrode and system cannot meet the needs of fine ear surgery, and can give full play to the advantages of the good cutting and coagulation effects of the low-temperature plasma microelectrode and system, which can reduce bleeding and improve the surgical field of view. This method is significantly different from the current ear endoscopic surgery method.

[0129] 3. The suction unit is independent of the plasma electrode, providing conditions for further micronization of the plasma electrode; the suction unit can take away waste liquid in time, so that the otoscope lens can keep clean and the surgical field clear, greatly improving the fluency and safety of the operation.

[0130] Deficiencies to be made up:

[0131] The use of a new type of microelectrode solves the technical problem that the existing microelectrode in ear endoscopic surgery cannot improve the convenience of various other operations (such as digging, pulling, digging, expanding the ablation range, etc.) while ensuring refined electrocoagulation operations.

[0132] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, combination, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A plasma microelectrode (2), comprising a handle (21), wherein a cable plug (24) is provided at the proximal end of the handle (21), and a front end assembly (22) is provided at the front end of the handle (21) via a fixing member (211), wherein: The front end assembly (22) comprises a heat shrink tube (223), a return pole steel tube (220), a support tube (225) and an electrode wire (224) which are arranged in sequence from the outside to the inside; the portion of the return pole steel tube (220) extending out of the heat shrink tube (223) to the distal end forms a return pole (221), and a working pole (23) is arranged at the distal end of the return pole (221) in isolation via an insulating column (222); the working pole (23) comprises a first pole (234) and a second pole (232), the first pole (234) and the second pole (232) being connected to the electrode wire (224) respectively; at least one side of the second pole (232) exceeds the first pole (234), and cooperates with the first pole (234) to form a recessed portion (233).

2. A plasma microelectrode (2) according to claim 1, characterized in that: The first pole (234) is in a sheet shape, and the second pole (232) surrounds the first pole (234) to form a double-layer structure.

3. A plasma microelectrode (2) according to claim 2, characterized in that: The first pole (234) is an electrode sheet or a sheet-shaped electrode formed by winding an electrode wire (224) and then flattening it, and the second pole (232) is an electrode formed by winding an electrode wire (224) and then flattening it.

4. A plasma microelectrode (2) according to claim 1, characterized in that: The first pole (234) and the second pole (232) are both in sheet form, and the second pole (232) and the first pole (234) form a parallel double-layer structure.

5. A plasma microelectrode (2) according to claim 4, characterized in that: The first electrode (234) and the second electrode (232) are both electrode sheets, or are both sheet-shaped electrodes formed by winding an electrode wire (224) and then flattening it, or one of them is an electrode sheet and the other is a sheet-shaped electrode formed by winding an electrode wire (224) and then flattening it.

6. A plasma microelectrode (2) according to claim 1, characterized in that: After the second pole (232) extends out of the insulating column (222), it forms a single-layer structure with the first pole (234).

7. A plasma microelectrode (2) according to claim 1, characterized in that: The insulating column (222) and the loop pole steel tube (220) form a bent structure, and the second pole (232) is located inside the bent structure after extending out of the insulating column (222).

8. A plasma microelectrode (2) according to claim 7, characterized in that: The bending structure includes at least two types: Type A: The loop pole steel pipe (220) is of natural bending type; Type B: The loop pole steel pipe (220) and the insulating column (222) are connected in a bent manner.

9. A plasma microelectrode (2) according to any one of claims 1 to 8, characterized in that: The first pole (234) and the second pole (232) are both axially symmetrical structures, and the distal ends of both are arc-shaped.

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