High-precision rongeur

Abstract

The invention discloses a high-precision rongeur which comprises a rongeur cylinder, a sleeve and a rongeur rod. One end of the plier cylinder is hinged with a plier mouth, and the plier mouth is provided with a plier blade in sliding fit with the plier mouth; the sleeve is slidably inserted into the plier cylinder, and the end part of the sleeve is hinged with the plier mouth; the forceps rod is inserted into the sleeve in a sliding manner, the end part of the forceps rod is connected with the forceps blade, and the forceps rod translates to control the shearing action between the forceps blade and the forceps mouth; at least part of the forceps rod is a flexible section, and the flexible section of the forceps rod is close to the hinge point of the forceps mouth and can be bent by the same angle along with rotation of the forceps mouth. In the spinal operation process, the angle of the meshing cutting edge formed between the forceps mouth and the forceps edge can be finely adjusted along with control of a doctor at the operation end, and the situation that the forceps mouth shields a spinal endoscope, and consequently an imaging blind area is generated is avoided; and meanwhile, the occlusion cutting edge can be positioned at a better angle to bite a dead bone or trim a bone stump, so that bone bite operation can be conveniently carried out by matching with imaging of a spine endoscope.

Description

Technical Field

[0001] The invention relates to the technical field of orthopedic surgical instruments, and in particular to a high-precision bone rongeur. Background Art

[0002] Rongeurs, also called surgical forceps, are surgical instruments that are often used to cut and grasp tissue or organs. During surgery, doctors can use rongeurs to clamp blood vessels or cut tissue.

[0003] Rongeurs can be used in spinal surgeries, such as laminectomy, discectomy, spinal canal decompression and other surgical operations. Rongeurs come in different shapes and sizes, and different models and sizes are selected according to the needs of the operation. In minimally invasive spinal surgery, surgical instruments are guided and monitored by imaging instruments through tiny incisions or puncture channels on the patient to reach the lesion site for surgery, and the rongeurs are used to bite dead bones or trim bone stumps to achieve the purpose of inspection and treatment.

[0004] However, it is not easy to change the angle of the tongs head of the existing bone rongeurs, and the flexibility is poor when used with a spinal endoscope. Summary of the invention

[0005] The purpose of the present invention is to provide a high-precision rongeur to solve the problems in the prior art that the rongeur's occlusal blade has a single occlusal direction, is easily blocked by spinal endoscope imaging, and has poor force on the rongeur blade during bone biting operation.

[0006] In order to solve the above technical problems, the present invention specifically provides the following technical solutions:

[0007] The present invention provides a high-precision bone-binding forceps, comprising: a forceps barrel, one end of which is hinged with a forceps mouth, and the forceps mouth is provided with a forceps blade that slidably cooperates with the forceps mouth, and the bone block is cut by the shearing action of the forceps blade and the forceps mouth; a sleeve, which can be slidably inserted into the forceps barrel, the end of the sleeve is hinged to the forceps mouth, and the sleeve moves horizontally in the forceps barrel to control the forceps mouth to rotate around the hinge axis between the sleeve and the forceps barrel; a forceps rod, which can be slidably inserted into the sleeve, the end of the forceps rod is connected to the forceps blade, and the forceps rod moves horizontally to control the shearing action between the forceps blade and the forceps mouth; wherein, at least a part of the forceps rod is a flexible section, the flexible section of the forceps rod is close to the hinge point of the forceps mouth, and the flexible section of the forceps rod can bend at the same angle as the forceps mouth rotates.

[0008] Furthermore, the clamp rod includes two rigid rods separated from each other and guide rods respectively connected to the ends of the rigid rods, and the guide rods can be bent; wherein the diameter of the guide rod is smaller than that of the rigid rod, and an annular groove-shaped open space is formed around the guide rod; a bending spring is sleeved on the guide rod, and the two ends of the bending spring respectively abut against the ends of the rigid rod to limit itself.

[0009] Furthermore, the pliers mouth is hinged to the pliers barrel and the sleeve respectively; wherein, a first hinged ear symmetrically extending along the axial direction from the middle part of the end surface of the pliers barrel is used to hinge the pliers mouth; a second hinged ear extending along the axial direction from the middle part of the end surface of the sleeve is used to hinge the pliers mouth, and the second hinged ear is located above / below the symmetry plane of the two first hinged ears.

[0010] Furthermore, one end of the sleeve extends out of the clamp barrel along its axis to form a threaded portion, and the clamp barrel is provided with a screw sleeve, the screw sleeve and the threaded portion are threadedly connected, and the sleeve can be moved horizontally by rotating the screw sleeve; wherein the screw sleeve and the clamp barrel are limited by an annular flange.

[0011] Furthermore, a pliers handle is provided at one end of the pliers barrel for pushing the pliers rod toward the end where the pliers mouth is located; wherein, a support frame is sleeved on the outer periphery of one end of the pliers barrel, and a mounting cylinder coaxial with the pliers barrel is provided on one side of the support frame, and the pliers rod passes through the support frame and can be slidably inserted into the mounting cylinder; the pliers handle is divided into a fixed pliers handle and a movable pliers handle, the fixed pliers handle is fixed to the end of the mounting cylinder, and a circular groove is provided on the fixed pliers handle, and the center of the circular groove coincides with the axis of the pliers rod; a protrusion installed in the circular groove is provided at the end of the movable pliers handle, and the protrusion is hinged to the fixed pliers handle in the circular groove; an outwardly protruding limit head is provided at the end of the pliers rod, and a compression spring limited by the limit head is sleeved on the pliers rod, and a push rod extending through the circular groove in the direction of the pliers handle is provided on the top of the limit head, and the push rod is resting on the protrusion.

[0012] Furthermore, the support frame is framed outside the screw sleeve, and the outer peripheral wall of the screw sleeve protrudes from the support frame.

[0013] Furthermore, the interface between the pliers mouth and the pliers blade is slidably connected via a slider and a slide groove.

[0014] Furthermore, the shearing surfaces of the pliers mouth and the pliers blade are inclined at 30 degrees relative to the end surface of the pliers barrel.

[0015] Furthermore, the jaws and the blades are respectively provided with concave cavities which together form a receiving chamber for receiving bone blocks.

[0016] Furthermore, connecting chambers with circular cross sections are respectively provided on the connecting wall surfaces of the pliers mouth and the pliers blades, and the ends of the pliers rods are fixedly arranged in the connecting chambers.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention allows the orientation of the biting edge formed between the jaws and the blades to be finely adjusted as the doctor controls the operation end during spinal surgery, which helps to prevent the jaws from blocking the spinal endoscope and causing an imaging blind spot, while also facilitating the biting edge to be at a better angle for biting dead bone or trimming bone stumps, so as to facilitate bone biting operations in conjunction with spinal endoscope imaging; it can achieve precise operations of biting dead bone and trimming bone stumps, and avoids the problem that the conventional fixed jaws and blades not only affect the spinal endoscope imaging during operation, but also cannot adjust the orientation of the biting edge. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0020] Figure 1 A three-dimensional structural diagram of a high-precision rongeur provided by the present invention;

[0021] Figure 2 for Figure 1 Fracture view and exploded view of the

[0022] Figure 3 for Figure 2 Enlarged view of middle Ⅰ;

[0023] Figure 4 for Figure 2 Enlarged view of middle Ⅱ;

[0024] Figure 5 for Figure 1 The main view and its partial views;

[0025] Figure 6 for Figure 1 A fractured view from another perspective;

[0026] Figure 7 for Figure 1 A partial broken view of another embodiment provided by the present invention;

[0027] Figure 8 for Figure 7 A cross-sectional view of the receiving chamber.

[0028] The numbers in the figure represent the following:

[0029] 10. Pliers barrel; 11. Pliers mouth; 111. Sliding block; 112. Sliding groove; 12. Pliers blade; 13. First hinged ear; 14. Screw sleeve; 15. Annular flange; 16. Pliers handle; 161. Fixed pliers handle; 162. Moving pliers handle; 163. Circular groove; 164. Bump; 17. Support frame; 18. Mounting barrel; 20. Sleeve; 21. Second hinged ear; 22. Screw connection; 30. Pliers rod; 31. Rigid rod; 32. Guide rod; 33. Bending spring; 34. Limiting head; 35. Compression spring; 36. Push rod; 40. Accommodating chamber; 50. Connecting chamber. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] like Figure 1-3 As shown, the present invention provides a high-precision bone rongeur, comprising:

[0032] A pliers barrel 10, one end of which is hinged with a pliers mouth 11, and a pliers blade 12 is provided on the pliers mouth 11 to slide with the pliers mouth 11, and the bone block is cut by the shearing action of the pliers blade 12 and the pliers mouth 11;

[0033] The sleeve 20 is slidably inserted into the pliers barrel 10, and the end of the sleeve 20 is hinged to the pliers mouth 11. The sleeve 20 moves in translation in the pliers barrel 10 to control the pliers mouth 11 to rotate around the hinge axis between the sleeve 20 and the pliers barrel 10;

[0034] A pliers rod 30 is slidably inserted into the sleeve 20, and an end of the pliers rod 30 is connected to the pliers blade 12. The pliers rod 30 moves horizontally to control the shearing action between the pliers blade 12 and the pliers mouth 11;

[0035] The pliers rod 30 is at least partially a flexible section, and the flexible section of the pliers rod 30 is close to the hinge point of the pliers mouth 11 . The flexible section of the pliers rod 30 can bend at the same angle as the pliers mouth 11 rotates.

[0036] The high-precision bone-biting forceps provided by the present invention can fine-tune the direction of the occlusal edge formed between the jaws 11 and the blades 12 during spinal surgery as controlled by the doctor at the operating end, which helps to avoid the jaws 11 blocking the spinal endoscope and causing a blind spot for imaging, and is also conducive to placing the occlusal edge at a better angle to bite dead bone or trim bone stumps, so as to facilitate bone biting operations in conjunction with spinal endoscope imaging. Specifically, the jaws 11 can rotate around the hinge axis under the control of the sleeve 20, and can drive the flexible section of the jaw rod 30 to bend while rotating, so that the jaws 30 can always bend with the rotation of the jaws 11, so that it is always in a position to push the blades 12, so that accurate operations of biting dead bone and trimming bone stumps can be achieved, and the problem that the conventional fixed jaws 11 and blades 12 not only affect the imaging of the spinal endoscope during operation, but also cannot adjust the direction of the occlusal edge can be avoided.

[0037] In this embodiment, the flexible section of the clamp rod 30 can be made of materials such as rubber, memory metal, etc., so as to achieve the bending of the clamp rod 30 as a whole and continue to push the clamp blade 12 to perform the shearing action.

[0038] In the above embodiment, the thrust force on the blade 12 depends on the flexible section on the pliers rod 30 for force transmission. In this case, the setting of the flexible section should ensure that it is easy to bend when the jaw 11 rotates, and it should also ensure that it withstands a certain axial force without bending when the pliers rod 30 pushes. There is a contradiction between the two. That is, if the bending performance of the flexible section is good, it is difficult for it to withstand the axial force from the pliers rod 30, and it is easy to bend further under the pushing action of the pliers rod 30, and it is difficult to use it to push the blade 12 to complete the bone biting operation.

[0039] To solve the above problems, see Figure 1 , 7 As shown, in a preferred embodiment provided by the present invention based on the above-mentioned embodiment, the clamp rod 30 includes two sections of rigid rods 31 separated from each other and guide rods 32 respectively connected to the ends thereof, and the guide rods 32 can be bent; wherein, the diameter of the guide rod 32 is smaller than that of the rigid rod 31, and an annular groove-shaped open space is formed around the guide rod 32; a bending spring 33 is sleeved on the guide rod 32, and the two ends of the bending spring 33 respectively abut against the ends of the rigid rod 31 to limit itself.

[0040] In this embodiment, the easily bendable guide rod 32 is used as the flexible section on the clamp rod 30, so that the split body at the end of the clamp rod 30 is easy to bend away from the axis of the main body. At the same time, by setting the bending spring 33, it is easy to control the main body of the clamp rod 30 to transfer its force to the split body of the clamp rod 30 through the bending spring 33, so as to further push the clamp blade 12, instead of mainly relying on the easily bendable guide rod 32 for force transmission, so that the clamp rod 30 can easily push the clamp blade 12 to perform the bite operation during the pushing process, avoiding the situation that after the clamp rod 30 moves to the extreme position, the flexible section on the clamp rod 30 is compressed and cannot form an effective thrust on the clamp blade 12, thereby ensuring the stability of the bite force during the bone biting operation.

[0041] In the above embodiments, the different hinge positions between the jaws 11 and the barrel 10 and the sleeve 20 will cause the engaging edges to face different directions and to be at different engaging angles, thereby affecting the cutting operation.

[0042] In order to solve the above problems, Figure 6 As shown, in a preferred embodiment provided by the present invention based on the above-mentioned embodiment, the pliers mouth 11 is hinged to the pliers barrel 10 and the sleeve 20 respectively; wherein, a mutually symmetrical first hinged ear 13 is extended along the axial direction from the middle part of the end surface of the pliers barrel 10 for hingedly connecting the pliers mouth 11; a second hinged ear 21 is extended along the axial direction from the middle part of the end surface of the sleeve 20 for hingedly connecting the pliers mouth 11, and the second hinged ear 21 is located above / below the symmetry plane of the two first hinged ears 13.

[0043] In this embodiment, when the jaws 11 rotate, the hinge shaft in the second hinged ear 21 rotates and also revolves around the hinge shaft of the first hinged ear 13. Since the relative positions of the two hinge shafts change, the second hinged ear 21 is deformed by force. Therefore, the second hinged ear 21 can be made of a flexible material to adaptively produce elastic deformation during the rotation of the jaws 11. On the other hand, an additional connecting rod or moving block can be hinged on the second hinged ear 21 to increase the degree of freedom, thereby ensuring that the rotation of the jaws 11 is not hindered.

[0044] In order to precisely control the translation process of the sleeve 20 so that the angle of the pliers mouth 11 can be fine-tuned, such as Figure 4 , 6 As shown, in a preferred embodiment provided by the present invention based on the above-mentioned embodiment, one end of the sleeve 20 extends out of the pliers barrel 10 along its axis to form a threaded portion 22, and the pliers barrel 10 is provided with a screw sleeve 14, and the screw sleeve 14 and the threaded portion 22 are threadedly connected, and the sleeve 20 can be translated by rotating the screw sleeve 14; wherein, the screw sleeve 14 and the pliers barrel 10 are limited by an annular flange 15.

[0045] In this embodiment, by the threaded connection between the screw sleeve 14 and the threaded portion 22, the screw sleeve 14 can freely rotate along the circumference of the pliers barrel 10 through the limitation of the annular flange 15, while causing the sleeve 20 to produce a translational motion, so that the angle of the pliers mouth 11 hinged at its end can be fine-tuned to facilitate the bone biting operation.

[0046] In order to enable the pliers rod 30 to be pushed to adjust the biting action of the pliers blade 12, as shown in FIG. Figure 5-6 As shown, in a preferred embodiment provided by the present invention based on the above-mentioned embodiment, a pliers handle 16 is provided at one end of the pliers barrel 10 for pushing the pliers rod 30 toward the end where the pliers mouth 11 is located; wherein a support frame 17 is sleeved on the outer periphery of one end of the pliers barrel 10, a mounting tube 18 coaxial with the pliers barrel 10 is provided on one side of the support frame 17, the pliers rod 30 penetrates the support frame 17 and can be slidably inserted into the mounting tube 18; the pliers handle 16 is divided into a fixed pliers handle 161 and a movable pliers handle 162, the fixed pliers handle 161 is fixed to the end of the mounting tube 18, and the fixed pliers handle 162 is provided on the outer periphery of the one end of the pliers barrel 10. A circular groove 163 is provided on 161, and the center of the circular groove 163 coincides with the axis of the clamp rod 30; a protrusion 164 installed in the circular groove 163 is provided at the end of the movable clamp handle 162, and the protrusion 164 is hinged to the fixed clamp handle 161 in the circular groove 163; an outwardly protruding limit head 34 is provided at the end of the clamp rod 30, and a compression spring 35 limited by the limit head 34 is sleeved on the clamp rod 30, and a top rod 36 extending through the circular groove 163 toward the clamp handle 16 is provided on the top of the limit head 34, and the top rod 36 abuts against the protrusion 164.

[0047] In this embodiment, through the hinged cooperation between the fixed clamp handle 161 and the movable clamp handle 162, the protrusion 164 at the end of the movable clamp handle 162 can be used to push the clamp blade 12 of the clamp rod 30 during the rotation process. Since the clamp rod 30 is provided with a limit head 34 for setting a compression spring 35, it is not easy for the clamp rod 30 to enter the installation tube 18 and abut against the protrusion 164. Therefore, a linkage push rod 36 is set between the limit head 34 and the protrusion 164 to abut between the two to transmit force, so that the clamp handle 16 can control the clamp rod 30 during the shearing process so that the clamp blade 12 at the other end can perform bone biting operation.

[0048] In order to facilitate manual rotation of the screw sleeve 14 to adjust the angle of the pliers mouth 11, Figure 6 As shown, in a preferred embodiment provided by the present invention based on the above embodiments, the support frame 17 is framed outside the screw sleeve 14 , and the outer peripheral wall of the screw sleeve 14 protrudes from the support frame 17 .

[0049] In order to achieve a sliding connection between the pliers mouth 11 and the pliers blade 12, as Figure 6 As shown, in a preferred embodiment provided by the present invention based on the above-mentioned embodiment, the contact surfaces of the pliers mouth 11 and the pliers blade 12 are slidably connected via a slider 111 and a slide groove 112;.

[0050] In order to form a cutting edge between the jaws 11 and the blades 12 that is convenient for biting and realizing the bone biting operation, Figure 2-3 As shown, in a preferred embodiment provided by the present invention based on the above-mentioned embodiment, the shearing surfaces of the pliers mouth 11 and the pliers blade 12 are respectively inclined at 30° relative to the end surface of the pliers barrel 10 .

[0051] In the above embodiment, after biting the bone, the bitten dead bone may get stuck between the jaws 11 and the blades 12, or the bone block may fall off easily, which makes the bone removal operation after biting the bone inconvenient.

[0052] In order to solve the above problems, Figure 7-8 As shown, in a preferred embodiment of the present invention provided based on the above-mentioned embodiment, concave cavities are respectively provided on the jaws 11 and the blades 12 to together form a receiving chamber 40 for receiving bone blocks.

[0053] In this embodiment, by setting up the accommodating chamber 40, the bitten dead bone can be stored in the accommodating chamber 40. When the doctor loosens the forceps handle 16, the opened accommodating chamber 40 will expose the dead bone, thereby preventing the dead bone from falling and facilitating the bone removal operation after biting the bone.

[0054] In order to facilitate the formation of a fixed connection between the end of the pliers rod 30 and the pliers mouth 11 and the pliers blade 12, as shown in FIG. Figure 3 As shown, in a preferred embodiment of the present invention provided based on the above-mentioned embodiment, connecting walls of the pliers mouth 11 and the pliers blade 12 are respectively provided with connecting chambers 50 with circular cross-sections, and the ends of the pliers rod 30 are fixed in the connecting chambers 50 .

[0055] The above embodiments are only exemplary embodiments of the present application and are not intended to limit the present application. The protection scope of the present application is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present application within the essence and protection scope of the present application, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present application.

Claims

1. A high-precision rongeur, characterized in that: include: A pliers barrel (10) is hingedly connected at one end with a pliers mouth (11), the pliers mouth (11) is provided with a pliers blade (12) which is slidably matched with the pliers mouth (11), and the bone block is cut through the shearing action of the pliers blade (12) and the pliers mouth (11); A sleeve (20) is slidably inserted into the pliers barrel (10), the end of the sleeve (20) is hinged to the pliers mouth (11), and the sleeve (20) moves in translation in the pliers barrel (10) to control the pliers mouth (11) to rotate around the hinge axis between the sleeve (20) and the pliers barrel (10); A pliers rod (30) is slidably inserted into the sleeve (20), the end of the pliers rod (30) is connected to the pliers blade (12), and the pliers rod (30) moves in translation to control the shearing action between the pliers blade (12) and the pliers mouth (11); The pliers rod (30) is at least partially a flexible section, the flexible section of the pliers rod (30) is close to the hinge point of the pliers mouth (11), and the flexible section of the pliers rod (30) can bend at the same angle as the pliers mouth (11) rotates.

2. A high-precision rongeur according to claim 1, characterized in that: The clamp rod (30) comprises two rigid rods (31) separated from each other and guide rods (32) respectively connected to the ends of the two rigid rods, and the guide rods (32) are bendable; The guide rod (32) has a smaller diameter than the rigid rod (31), and an annular groove-shaped open space is formed around the guide rod (32); The guide rod (32) is sleeved with a bending spring (33), and the two ends of the bending spring (33) respectively abut against the end of the rigid rod (31) to limit itself.

3. A high-precision rongeur according to claim 2, characterized in that: The pliers mouth (11) is hinged to the pliers barrel (10) and the sleeve (20) respectively; Wherein, a first hinged ear (13) symmetrically extending from the middle of the end surface of the pliers barrel (10) along its axial direction is used for hinged connection of the pliers mouth (11); A second hinged ear (21) extends axially from the middle of the end surface of the sleeve (20) for hinged connection with the pliers mouth (11), and the second hinged ear (21) is located above / below the symmetry plane of the two first hinged ears (13).

4. A high-precision rongeur according to claim 3, characterized in that: One end of the sleeve (20) extends out of the clamp barrel (10) along its axis to form a threaded portion (22); a threaded sleeve (14) is provided on the clamp barrel (10); the threaded sleeve (14) and the threaded portion (22) are threadedly connected; the sleeve (20) can be translated by rotating the threaded sleeve (14); The threaded sleeve (14) and the clamp barrel (10) are limited by an annular flange (15).

5. A high-precision rongeur according to claim 4, characterized in that: A pliers handle (16) is provided at one end of the pliers barrel (10) for pushing the pliers rod (30) toward the end where the pliers mouth (11) is located; A support frame (17) is sleeved on the outer periphery of one end of the clamp barrel (10), a mounting barrel (18) coaxial with the clamp barrel (10) is provided on one side of the support frame (17), and the clamp rod (30) passes through the support frame (17) and is slidably inserted into the mounting barrel (18); The clamp handle (16) is divided into a fixed clamp handle (161) and a movable clamp handle (162), the fixed clamp handle (161) is fixed to the end of the mounting tube (18), a circular groove (163) is formed on the fixed clamp handle (161), and the center of the circular groove (163) coincides with the axis of the clamp rod (30); The end of the movable clamp handle (162) is provided with a protrusion (164) installed in the circular groove (163), and the protrusion (164) is hinged to the fixed clamp handle (161) in the circular groove (163); The end of the clamp rod (30) is provided with an outwardly protruding limit head (34), the clamp rod (30) is sleeved with a compression spring (35) which is limited by the limit head (34), and the top of the limit head (34) is provided with a push rod (36) which extends toward the clamp handle (16) and passes through the circular groove (163), and the push rod (36) abuts against the protrusion (164).

6. A high-precision rongeur according to claim 5, characterized in that: The support frame (17) is framed outside the screw sleeve (14), and the outer peripheral wall of the screw sleeve (14) protrudes from the support frame (17).

7. A high-precision rongeur according to claim 6, characterized in that: The contact surfaces of the pliers mouth (11) and the pliers blade (12) are slidably connected via a sliding block (111) and a sliding groove (112).

8. A high-precision rongeur according to claim 7, characterized in that: The shearing surfaces of the pliers mouth (11) and the pliers blade (12) are respectively inclined at 30 degrees relative to the end surface of the pliers barrel (10).

9. A high-precision rongeur according to claim 8, characterized in that: The pliers mouth (11) and the pliers blade (12) are respectively provided with concave cavities which together form a receiving chamber (40) for receiving bone blocks.

10. A high-precision rongeur according to claim 9, characterized in that: A connecting chamber (50) with a circular cross section is respectively provided on the connecting wall surfaces of the pliers mouth (11) and the pliers blade (12), and the end of the pliers rod (30) is fixedly arranged in the connecting chamber (50).

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