Anti-clogging suction hole plasma surgical electrode

Abstract

The utility model discloses a kind of anti-blocking suction hole plasma surgical electrode, belong to medical instrument technical field, a kind of anti-blocking suction hole plasma surgical electrode, including handle, the handle one end connects sword bar, the handle other end connects suction tube and cable that pass through handle, the cable includes outer tube connecting line and sub-needle connecting line;The sword bar includes outer tube and sub-needle group, and the outer tube is installed with tool bit in one end, and the other end of outer tube is connected with outer tube connecting line;Tool bit includes the sub-needle seat of preventing suction hole blockage, and sub-needle seat connects suction tube, and sub-needle group one end is fixed on sub-needle seat, and the other end of sub-needle group is connected with sub-needle connecting line. By optimizing suction pipeline connection structure to guarantee that suction passage is unobstructed, by strengthening tool bit connection stability to eliminate the technical problem of security risk, ensure that suction function is reliable and tool bit work safety.

Description

Technical Field

[0001] This utility model relates to a plasma surgical electrode that prevents blockage of the suction hole, belonging to the field of medical device technology. Background Technology

[0002] Low-temperature plasma technology is an innovative new technique in minimally invasive clinical surgery. Its working principle combines bipolar energy with continuous saline irrigation to generate a stable plasma layer for tissue resection. Its advantages include integrating cutting, ablation, coagulation, irrigation, and / or suction into a single process, facilitating surgical manipulation. Tissue resection is performed at relatively low temperatures (40-70℃), minimizing thermal damage to surrounding tissues. The plasma layer allows for precise tissue removal while minimizing thermal damage to non-target tissues.

[0003] Existing plasma surgical electrodes often experience clogging of the suction hole in the needle holder during surgery, hindering the removal of tissue debris and affecting surgical outcomes, potentially even leading to surgical interruption. The commonly used manufacturing method involves connecting the needle holder to the water pipe via a stainless steel connecting tube bonded with epoxy adhesive, forming the suction channel. However, the needle holder is a through hole, and the wall thickness of the stainless steel connecting tube reduces the inner diameter area of ​​the needle holder. If tissue debris larger than the inner diameter of the connecting tube is encountered, it can become trapped inside the needle holder, clogging the suction hole. Simultaneously, the electrode tip generates a high temperature of approximately 70°C during surgery, which can melt the epoxy adhesive, worsening the seal between the stainless steel connecting tube and the needle holder. This can lead to saline solution being drawn into the electrode's electrical system during suction, causing short circuits and even medical accidents. Therefore, there is an urgent need for those skilled in the art to develop a plasma surgical electrode that prevents clogging of the suction hole. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a plasma surgical electrode that prevents blockage of the suction hole. This is achieved by optimizing the connection structure of the suction channel to ensure unobstructed suction and by strengthening the connection stability of the blade to eliminate potential safety hazards, thereby ensuring reliable suction function and safe operation of the blade.

[0005] The technical solution adopted by this utility model to solve its existing problems is:

[0006] A plasma surgical electrode for preventing blockage of suction holes includes a handle, one end of which is connected to a blade, and the other end of which is connected to a suction tube passing through the handle and a cable, the cable including an outer tube connecting wire and a sub-needle connecting wire;

[0007] The cutter bar includes an outer tube and a sub-needle assembly. One end of the outer tube is equipped with a cutter head, and the other end of the outer tube is connected to an outer tube connecting line.

[0008] The cutter head includes a needle holder to prevent the suction hole from being blocked. The needle holder is connected to the suction tube. One end of the needle assembly is fixed to the needle holder, and the other end of the needle assembly is connected to the needle connecting line.

[0009] Preferably, the handle includes a fixing frame, a handle body, and a cable sheath. The fixing frame and the cable sheath are snapped together to form an integral unit. The handle body is sleeved on the fixing frame and the cable sheath and is fixedly connected to the fixing frame and the cable sheath.

[0010] Preferably, the fixing frame includes a small shaft segment and a large shaft segment, which are fixedly connected;

[0011] The large shaft section includes a radial cut, and a first groove is formed on the radial cut. At the end away from the small shaft section, a stop block is radially arranged in the first groove, and the stop block and the first groove surround a second groove.

[0012] Preferably, the fixing frame has a first through hole in the axial direction, the first through hole passes through the small shaft section and the large shaft section, the first through hole is connected to the first groove, and the suction tube, the outer tube and the sub-needle group are all inserted into the first through hole.

[0013] Preferably, the cable sheath includes a second limiting block, on which a cable hole is formed, the cable hole being adapted to the cable, the cable hole passing through the cable sheath axially, and the second limiting block engaging with a second groove;

[0014] The cable sheath has a second through hole that extends along the axial direction of the cable sheath. The second through hole is located above the second limiting block and is adapted to the suction tube.

[0015] Preferably, one end of the sub-needle seat is integrally connected to a connecting tube, and the other end of the sub-needle seat has multiple sub-needle holes and a suction hole that penetrate the sub-needle seat. The sub-needle holes are evenly distributed around the sub-needle seat, and the suction hole is connected to the connecting tube, which is connected to the suction tube.

[0016] Preferably, the sub-needle group includes multiple sub-needles, the sub-needles are inserted into the sub-needle hole, and the ends of the sub-needles protrude from the sub-needle seat.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] 1. Solve the problem of suction hole blockage and ensure surgical continuity: The needle hub and connecting tube adopt an integrated design. The suction channel formed by the connecting tube and the suction tube has no risk of narrowing. Intraoperative tissue debris can smoothly pass through the suction hole and connecting tube into the suction tube, which greatly reduces the probability of suction hole blockage, avoids interruption of surgery due to cleaning blockage, shortens surgical time, and ensures the continuity of surgical process.

[0019] 2. Improve the stability of the blade structure and eliminate safety hazards: The needle seat and the connecting tube are integrally molded, and the needle seat is made of high temperature resistant insulating material, which can withstand the high temperature environment during surgery and prevent the connecting tube from falling off due to high temperature. At the same time, the suction tube is made of high strength insulating material and fits tightly with the connecting tube, effectively preventing saline from seeping into the circuit system and eliminating the risk of short circuit and medical accidents.

[0020] 3. Reliable sub-needle positioning ensures surgical precision: The sub-needle plate is fixed to the end face of the sub-needle seat by tightening the sub-needle. The diameter of the sub-needle limiting hole of the sub-needle plate is smaller than the size of the part of the sub-needle protruding from the sub-needle seat, forming a reliable axial limit. When the sub-needle is subjected to force during the operation, it will not retract into the sub-needle hole, ensuring stable output of plasma energy, precise removal of lesions, and reducing secondary operations.

[0021] 4. Ergonomic handle design enhances operational comfort and efficiency: The handle is equipped with an acupressure platform, and the acupressure platform and the needle are on the same axis. During the operation, the doctor can intuitively judge the position of the needle through the acupressure platform without repeated confirmation, which improves the accuracy of operation. The acupressure platform conforms to the hand's force exertion habits and is ergonomic. It is not easy to get tired when holding it for a long time, which effectively improves surgical efficiency and doctor's operating comfort.

[0022] 5. Multi-dimensional limiting and fixing enhances the overall structural stability: The second groove of the fixing frame and the second limiting block of the cable sheath are engaged and glued to limit the relative displacement between the two; the first limiting block of the handle body is inserted into the limiting groove of the fixing frame to prevent the handle body from rotating circumferentially. At the same time, after the handle body is fitted, it limits the radial displacement of the fixing frame and the cable sheath, ensuring that the components are firmly connected.

[0023] 6. Excellent material compatibility, extending electrode lifespan: Targeted materials are used for each key component. The sub-needle is made of high-temperature resistant metals (such as tungsten, molybdenum, and tungsten-molybdenum alloy) to ensure stable plasma energy output and prevent wear. The sub-needle seat and suction tube are made of high-temperature resistant insulation materials and high-strength insulation materials, respectively, taking into account both heat resistance and structural strength, extending the overall lifespan of the electrode and reducing the cost of medical consumables. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of a plasma surgical electrode with an anti-clogging suction hole according to the present invention;

[0025] Figure 2 This is a schematic diagram of the fixing frame structure of a plasma surgical electrode with anti-clogging suction hole according to the present invention;

[0026] Figure 3 This is a full cross-sectional schematic diagram of the handle of the anti-clogging suction hole plasma surgical electrode of this utility model;

[0027] Figure 4This is a side view of the handle of a plasma surgical electrode with an anti-clogging suction hole according to the present invention;

[0028] Figure 5 This is a schematic diagram of the cable sheath structure of a plasma surgical electrode with anti-clogging suction hole according to the present invention;

[0029] Figure 6 This is a schematic diagram of the sub-needle seat structure of a plasma surgical electrode with anti-clogging suction hole according to the present invention;

[0030] Figure 7 This is a schematic diagram of the structure of the anti-clogging suction hole plasma surgical electrode of this utility model after removing the handle body;

[0031] Figure 8 This utility model relates to a plasma surgical electrode with an anti-clogging suction hole. Figure 7 Enlarged view of section A in the image;

[0032] Figure 9 This utility model relates to a plasma surgical electrode with an anti-clogging suction hole. Figure 7 Enlarged view of section B in the image;

[0033] Figure 10 This is a partial cross-sectional schematic diagram of a plasma surgical electrode for preventing blockage of suction holes according to the present invention;

[0034] Figure 11 This utility model relates to a plasma surgical electrode with an anti-clogging suction hole. Figure 10 Enlarged view of a section at point C;

[0035] Figure 12 This utility model relates to a plasma surgical electrode with an anti-clogging suction hole. Figure 10 Enlarged view of a section at point D;

[0036] Figure 13 This utility model relates to a plasma surgical electrode with an anti-clogging suction hole. Figure 7 A partial structural diagram after removing the heat shrink tubing.

[0037] In the picture:

[0038] 1. Outer tube; 2. Insulating sleeve; 3. Fixing bracket; 301. Small shaft section; 302. Large shaft section; 303. Radial cut; 304. First groove; 305. Second groove; 306. Clearance groove; 307. Cable bundle plate; 308. Limiting groove; 309. First through hole; 3010. Stop block; 4. Handle body; 401. Small hole section; 402. Large hole section; 403. First limiting block; 5. Cable sheath; 501. Wire 502. Cable hole; 503. Second limiting block; 504. Connecting shaft; 505. Second through-tube hole; 6. Suction tube; 7. Cable; 706. Outer tube connecting line; 707. Sub-needle connecting line; 8. Sub-needle seat; 807. Sub-needle hole; 808. Suction hole; 809. Connecting tube; 9. Sub-needle; 10. Sub-needle piece; 1001. Sub-needle piece suction hole; 1002. Sub-needle limiting hole; 11. Heat shrink tubing; 12. Cable; 13. Crimping tube. Detailed Implementation

[0039] This specification and claims do not distinguish components by differences in name, but by differences in function. In the description of this utility model, it should be understood that terms such as "upper," "lower," "front," "rear," "left," "right," and "horizontal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In this utility model, unless otherwise expressly specified and limited, terms such as "installed," "connected," "joined," and "fixed" should be interpreted broadly. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0040] like Figures 1-12 The illustrated plasma surgical electrode for preventing clogging of the suction port includes a handle. One end of the handle is connected to a blade, and the other end is connected to a suction tube 6 passing through the handle and a cable 7. The cable 7 includes an outer tube connecting line 701 and a sub-needle connecting line 702. The blade includes an outer tube 1 and a sub-needle assembly. One end of the outer tube 1 is fitted with a blade head, and the other end is connected to the outer tube connecting line 701. The blade head includes a sub-needle seat 8 to prevent clogging of the suction port. The sub-needle seat 8 is connected to the suction tube 6, and one end of the sub-needle assembly is fixed to the sub-needle seat 8. The other end of the sub-needle assembly is connected to the sub-needle connecting line 702. The outer tube 1 is made of high-quality medical-grade metal, such as stainless steel.

[0041] An insulating sleeve 2 is fitted over the outer tube 1, and the insulating sleeve 2 is fixedly connected to the outer tube 1. The handle includes a fixing frame 3, a handle body 4, and a cable sheath 5. The fixing frame 3 and the cable sheath 5 are snapped together to form an integral unit. The handle body 4 is fitted onto the fixing frame 3 and the cable sheath 5, and the handle body 4 is fixedly connected to the fixing frame 3 and the cable sheath 5 by adhesive.

[0042] The fixing frame 3 includes a small shaft section 301 and a large shaft section 302, which are fixedly connected. The large shaft section 302 includes a radial cut 303, on which a first groove 304 is formed. At the end away from the small shaft section 301, a stop block 3010 is radially arranged in the first groove 304, and the stop block 3010 and the first groove 304 surround a second groove 305. The fixing frame 3 has a first through hole 309 axially, which passes through the small shaft section 301 and the large shaft section 302, and is connected to the first groove 304. The suction tube 6, the outer tube 1, and the sub-needle assembly are all inserted into the first through hole 309. A limiting groove 308 is formed at the end of the large shaft section 302 near the small shaft section.

[0043] The cable sheath 5 includes a main shaft section. A second limiting block 502 is provided at the front end of the main shaft section. The second limiting block 502 engages with a second groove 305 and is fixed by adhesive, restricting the mutual displacement between the fixing frame 3 and the cable sheath 5. To prevent interference between the cable sheath 5 and the fixing frame 3 when the second limiting block 502 engages with the second groove 305, a connecting shaft 503 is provided between the main shaft section and the second limiting block 502. At the end away from the small shaft section 301, the large shaft section 302 has a radially extending clearance groove 306. The clearance groove 306 is located between radially arranged stops 3010, and the connecting shaft 503 can adaptably pass through the clearance groove 306. One end of the connecting shaft 503 is fixedly connected to the main shaft section, and the other end is fixedly connected to the second limiting block 502.

[0044] The second limiting block 502 has a cable hole 501, which is adapted to the cable 7 and passes through the cable sheath 5 axially. The main shaft section of the cable sheath 5 has a second through hole 504 that passes through the cable sheath 5 axially. The second through hole 504 is located above the second limiting block 502 and is adapted to the suction tube 6.

[0045] The handle body 4 includes a small hole section 401 and a large hole section 402 opened along the axial direction of the handle body 4. The small hole section 401 and the large hole section 402 are connected. The end of the large hole section 402 near the small hole section 401 is provided with a first limiting block 403 adapted to the limiting groove 308. When the handle body 4 is sleeved on the fixing frame 3 and the cable sheath 5, the inner wall of the small hole section 401 abuts against the outer circular surface of the small shaft section 301, and the inner wall of the large hole section 402 abuts against the outer circular surface of the large shaft section 302. The first limiting block 403 is inserted into the limiting groove 308, further restricting the circumferential rotation of the handle body 4 on the fixing frame 3 and the cable sheath 5. The right end face of the handle body 4 abuts against the main shaft section of the cable sheath 5. The handle body 4, sleeved on the fixing frame 3 and the cable sheath 5, restricts the radial displacement of the fixing frame 3 and the cable sheath 5. The handle body 4 is equipped with an acupressure platform, which is on the same axis as the needle. During the operation, the doctor can clearly see the position of the needle. The acupressure platform is ergonomic, which improves the doctor's operating efficiency and comfort during the operation, increases the accuracy of the operation, and reduces the operation time.

[0046] The sub-needle holder 8 is integrally connected to a connecting tube 803 at one end, and has multiple sub-needle holes 801 and suction holes 802 penetrating through it at the other end. The sub-needle holes 801 are evenly distributed around the circumference of the sub-needle holder 8. The suction holes 802 connect to the connecting tube 803, and the suction tube 6 is sleeved on the connecting tube 803, forming a suction channel. When the plasma electrode is working, because the sub-needle holder 8 and the connecting tube 803 are integrally connected, the suction channel formed by the connecting tube 803 and the suction tube 6 will not narrow, making it easier to suction and remove tissue debris during the operation. This greatly reduces the risk of surgical electrode blockage leading to delayed surgery. Furthermore, the connecting tube 803 will not detach due to increased temperature at the tip, preventing saline from entering the circuit system, causing electrode short circuits, or even medical accidents. The sub-needle holder 8 is made of high-temperature resistant insulating material, such as (composite) alumina or (composite) zirconium oxide, and the suction tube 6 is made of high-strength insulating material, such as PVC.

[0047] The sub-needle assembly includes multiple sub-needles 9, each passing through a sub-needle hole 801, with its end protruding from the sub-needle seat 8. A sub-needle piece 10 is provided between the end of the sub-needle 9 and the end face of the sub-needle seat 8. The sub-needle piece 10 includes a sub-needle piece suction hole 1001 communicating with a suction hole 802, and a sub-needle limiting hole 1002 communicating with the sub-needle hole 801. The diameter of the sub-needle limiting hole 1002 is smaller than the size of the portion of the sub-needle 9 protruding from the sub-needle seat 8. The other end of the sub-needle 9 passes through the sub-needle hole 801 and the first through-tube hole 309 into the handle, and is crimped to the sub-needle connecting line 702 via a crimping tube 13. The crimping tube 13, through which the sub-needle 9 and the sub-needle connecting line 702 are crimped, is covered with a heat-shrink tubing 11 to protect the connection between the sub-needle 9 and the sub-needle connecting line 702. During the installation of the sub-needle 9, the sub-needle 9 first passes through the sub-needle limiting hole 1002 of the sub-needle plate 10, and then passes into the sub-needle hole 801 of the sub-needle seat 8. After the sub-needle 9 is connected to the sub-needle connecting line 702, the sub-needle 9 is pulled tight, thereby pressing and fixing the sub-needle plate 10 to the end face of the sub-needle seat 8, and also preventing the sub-needle 9 from retracting into the sub-needle hole 801 during operation. The sub-needle 9 is made of a high-temperature resistant metal material, such as tungsten, molybdenum, or tungsten-molybdenum alloy.

[0048] The outer tube 1 is a hollow round tube. To facilitate surgical operation, its head end is bent at a certain angle, which is beneficial for doctors to remove lesions in the corners of the patient's body and makes it easier for doctors to adjust the surgical site. One end connected to the handle is inserted into the handle through the first through-hole 309. A cable 12 of a certain length is provided at the tail end of the outer tube 1 that is inserted into the handle. The cable 12 is crimped to the outer tube connection line 701 through the crimping tube 13. The crimping tube 13, which is crimped to the outer tube connection line 701, is covered with a heat shrink sleeve 11 to protect the connection between the cable 12 and the outer tube connection line 701.

[0049] The connection between the sub-needle 9 and the sub-needle connecting line 702 forms the emitter of the plasma surgical electrode, and the connection between the outer tube 1 and the outer tube connecting line 701 forms the circuit electrode of the plasma surgical electrode.

[0050] A wire harness plate 307 is also mirror-arranged in the first groove 304. The heat shrink tubing 11 and the suction tube 6 are both passed through the wire harness plate 307, which is used to help fix the position of the heat shrink tubing 11 and the suction tube 6.

[0051] The working process of a plasma surgical electrode with anti-clogging suction hole is as follows:

[0052] When the plasma surgical electrode is in operation, the perfusion pump is activated to continuously infuse physiological saline into the surgical site, filling the surgical site with physiological saline and maintaining a constant pressure at the surgical site, providing a suitable liquid environment for the stable formation of the plasma layer and tissue removal.

[0053] After a constant-pressure saline environment is established at the surgical site, an external power supply supplies power to the internal circuit of the electrode through cable 7: the sub-needle connecting line 702 in cable 7 forms an electrical connection with the sub-needle 9 of the sub-needle group, and the outer tube connecting line 701 forms an electrical connection with the outer tube 1 of the knife bar, so that the outer tube 1 and the sub-needle 9 form a bipolar circuit.

[0054] After being powered on, a high-frequency, high-voltage electric field is generated between the outer tube 1 and the sub-needle 9. This electric field acts on the saline solution in the surgical area, causing the saline solution to ionize and form a stable plasma layer. The plasma layer accumulates in the end region of the sub-needle 9 and has the energy density to cut and ablate the diseased tissue.

[0055] The doctor adjusts the relative position of the sub-needle 9 and the lesion tissue by operating the handle, so that the plasma layer at the end of the sub-needle 9 can directly act on the target tissue. The energy released by the plasma layer can precisely destroy the molecular bonds of tissue cells, achieving the cutting and ablation of the lesion tissue. At the same time, the local energy generated by the bipolar circuit can cause coagulation of small blood vessels in the tissue, reducing bleeding in the surgical area. During the cutting process, the external control system can adjust the output energy parameters in real time through the cable 7 to adapt to the cutting needs of different tissues (such as meniscus, ligaments, and cartilage), ensuring the accuracy and safety of tissue resection.

[0056] Tissue debris generated during tissue cutting enters the suction channel formed by the connecting tube 803 and the suction tube 6 through the suction hole 802 of the needle holder 8. Under external negative pressure, it is promptly discharged from the surgical site to avoid debris accumulation affecting the stability of the surgical field and plasma layer. At the same time, the continuously infused saline solution cools the electrode tip (avoiding excessive local temperature) and maintains a constant pressure in the surgical area, ensuring the continuous and stable operation of the plasma surgical electrode until the cutting and repair of the target tissue is completed.

[0057] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A plasma surgical electrode with anti-clogging suction hole, characterized in that, include: The handle has a blade rod connected to one end and a suction tube (6) and a cable (7) that pass through the handle at the other end. The cable (7) includes an outer tube connecting line (701) and a sub-needle connecting line (702). The cutter bar includes an outer tube (1) and a sub-needle assembly. One end of the outer tube (1) is equipped with a cutter head, and the other end of the outer tube (1) is connected to an outer tube connecting line. The cutter head includes a needle seat (8) to prevent the suction hole from being blocked. The needle seat (8) is connected to the suction tube (6). One end of the needle assembly is fixed on the needle seat (8), and the other end of the needle assembly is connected to the needle connecting line (702).

2. The anti-clogging suction hole plasma surgical electrode according to claim 1, characterized in that: The handle includes a fixing frame (3), a handle body (4), and a cable sheath (5). The fixing frame (3) and the cable sheath (5) are snapped together to form an integral unit. The handle body (4) is sleeved on the fixing frame (3) and the cable sheath (5) and is fixedly connected to the fixing frame (3) and the cable sheath (5).

3. The anti-clogging suction hole plasma surgical electrode according to claim 2, characterized in that: The fixing frame (3) includes a small shaft section (301) and a large shaft section (302), which are fixedly connected; The large shaft section (302) includes a radial cut (303), on which a first groove (304) is provided. At one end away from the small shaft section (301), a stop block (3010) is radially provided in the first groove (304), and the stop block (3010) and the first groove (304) surround a second groove (305).

4. The anti-clogging suction hole plasma surgical electrode according to claim 3, characterized in that: The fixing frame (3) has a first through hole (309) axially. The first through hole (309) passes through the small shaft section (301) and the large shaft section (302). The first through hole (309) is connected to the first groove (304). The suction tube (6), the outer tube (1) and the sub-needle group are all inserted into the first through hole (309).

5. The anti-clogging suction hole plasma surgical electrode according to claim 4, characterized in that: The cable sheath (5) includes a second limiting block (502), on which a cable hole (501) is provided. The cable hole (501) is adapted to the cable (7). The cable hole (501) passes through the cable sheath (5) axially. The second limiting block (502) is engaged with the second groove (305). The cable sheath (5) has a second through hole (504) that extends through the cable sheath (5) along its axial direction. The second through hole (504) is located above the second limiting block (502) and is adapted to the suction tube (6).

6. The anti-clogging suction hole plasma surgical electrode according to claim 5, characterized in that: The sub-needle seat (8) is integrally connected to a connecting tube (803) at one end. The other end of the sub-needle seat (8) is provided with a plurality of sub-needle holes (801) penetrating the sub-needle seat (8) and a suction hole (802). The sub-needle holes (801) are evenly distributed around the sub-needle seat (8). The suction hole (802) is connected to the connecting tube (803). The connecting tube (803) is connected to the suction tube (6).

7. The anti-clogging suction hole plasma surgical electrode according to claim 6, characterized in that: The sub-needle group includes multiple sub-needles (9), the sub-needles (9) are inserted into the sub-needle hole (801), and the end of the sub-needle (9) protrudes out of the sub-needle seat (8).

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