Endoscope grasping forceps

Abstract

The utility model relates to endoscope grasping forceps which comprise a core rod assembly, a connecting assembly and a forceps head assembly, and the core rod assembly comprises finger rings, a core rod, a sliding ring and a fixing sleeve; the connecting assembly comprises a steel wire and an outer pipe; the tong head assembly comprises a support, a connecting rod and a tong claw. The near end of the support is fixedly connected with the outer tube, and a mounting opening is formed in the support. The two connecting rods are arranged in the mounting opening, one ends of the two connecting rods are hinged through a connecting pin, and the far end of the steel wire is connected with the connecting pin; the other ends of the two connecting rods are respectively hinged with the two gripper arms through pin shafts; the middles of the two clamp claws are hinged through a connecting shaft, the connecting shaft is installed in the C-shaped openings in the two sides of the far end of the support, and the connecting shaft and one clamp claw are fixedly connected or integrally formed. According to the scheme, the endoscope grasping forceps are simple in structure and convenient to disassemble and assemble.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to an endoscopic grasping forceps. Background Art

[0002] At present, the form of the diet environment is not optimistic. Coupled with people's bad eating habits and the lack of exercise, there are more and more patients with diseases such as stones and gastrointestinal diseases that need to be treated by endoscopic surgery, and the trend of youngerization is becoming more and more serious. As a surgical instrument supporting endoscopic surgery, the market scale of endoscopic grasping forceps is constantly expanding.

[0003] For example, the Chinese invention patent with the publication number CN110123391A discloses a biopsy forceps device that can avoid tearing and is rotatable, including two first forceps heads and a second forceps head that can mesh with each other. Its characteristics further include: a connecting piece for connecting the first forceps head and the second forceps head; a small pull rod for fixing the connecting piece; a steel wire rope arranged in the inner hole of the small pull rod; a pull rod for connecting the steel wire rope and a pull ring; a pull ring for fixing the pull rod. Compared with the prior art, the advantages of this invention are: the two cutting edges of the forceps head can still move a certain distance after contacting, compared with the original biopsy forceps head that cannot move continuously after contacting, the continuous movement of the cutting edges can ensure the thorough resection of tissues and avoid tissue tearing; by拨动 the拨片 on the rotating device, the rotating device conducts the rotating force to the outer sheath tube, and then the outer sheath tube带动 the support frame to rotate. Because the support frame and the forceps head are riveted together, the forceps head can be带动 to rotate.

[0004] In the above technical solution, when assembling the two forceps heads of the biopsy forceps device, the hinge hole positions of the two forceps heads need to be calibrated with the hole positions on the support frame, and then large rivets are used for riveting. This assembly method is relatively troublesome, time-consuming and laborious. Moreover, the overall structure of this device is also very troublesome to disassemble and assemble.

[0005] In addition, the preparation cost of some existing grasping forceps is high, and the surface of the forceps body is relatively flat, so it is easy to slip when grasping tissues, polyps and other foreign bodies. Summary of the Invention

[0006] In order to solve the above problems, the purpose of the utility model is to provide an endoscopic grasping forceps, which has a simple structure, is easy to disassemble and assemble, has a low cost, is easy to produce, and can reduce labor costs.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] An endoscopic grasping forceps, characterized in that: it includes a core rod assembly, a connecting assembly and a forceps head assembly, wherein,

[0009] The core rod assembly includes a finger ring, a core rod, a slip ring, and a fixing sleeve; the finger ring is fixedly installed on the proximal end of the core rod, the slip ring is slidably disposed on the core rod through a sliding hole, an opening communicating with the sliding hole is provided on the proximal side wall of the core rod, the connecting assembly is embedded in the opening, the fixing sleeve is sleeved on the distal end of the core rod and covers the opening, and the core rod is connected to the pliers head assembly through the connecting assembly;

[0010] The connecting assembly includes a steel wire and an outer tube; the steel wire is threaded through the outer tube, with the proximal end of the steel wire extending into the sliding hole of the core rod and fixedly connected to the slip ring, and the distal end of the steel wire extending out of the outer tube and connected to the pliers assembly; the proximal end of the outer tube is fixedly connected to the fixing sleeve and the core rod, and the distal end of the outer tube is connected to the pliers assembly.

[0011] The clamp assembly includes a bracket, connecting rods, and clamp jaws; the proximal end of the bracket is fixedly connected to the outer tube, and the bracket has an installation port; two connecting rods are disposed in the installation port, and one end of the two connecting rods is hinged by a connecting pin, and the distal end of the steel wire is connected to the connecting pin; the other end of each of the two connecting rods is hinged to one of the clamp jaws by a pin; the middle of the two clamp jaws is hinged by a connecting shaft, which is installed in the C-shaped openings on both sides of the distal end of the bracket, and the connecting shaft is fixedly connected to one of the clamp jaws or integrally formed.

[0012] The slip ring can slide on the core rod under the action of external force, thereby driving the steel wire to move back and forth. The steel wire drives the two jaws to rotate relative to the bracket to make opening and closing movements through two connecting rods.

[0013] Preferably, the jaws include a jaw body and an S-shaped connecting block, and the distal end of the jaw body is provided with an inwardly biased arc-shaped anti-disengagement hook.

[0014] Preferably, the inner wall of the clamp body is provided with multiple toothed steps.

[0015] Preferably, an S-shaped connecting block of a jaw has a first connecting hole that mates with a connecting shaft. The S-shaped connecting block extends into the mounting opening and is rotatably connected to the connecting shaft.

[0016] Preferably, the connecting rod is fixedly connected to the pin or integrally formed, and the S-shaped connecting block of the jaws is also provided with a second connecting hole that mates with the pin. One connecting rod is fixedly connected to or integrally formed with a connecting pin, and the other connecting rod is provided with a third connecting hole that mates with the connecting pin.

[0017] Preferably, the ring, core rod, slip ring, fixing sleeve, outer tube, bracket, connecting rod, pliers, and connecting shaft are all made of plastic.

[0018] Preferably, the distal end of the core rod is formed with a protrusion, and the proximal end of the outer tube is provided with a limiting cover that is sleeved on the outside of the protrusion.

[0019] Preferably, a ring of protrusions is formed on the distal sidewall of the core rod, a ring of grooves is formed on the fixing sleeve to cooperate with the protrusions, an annular support is formed on the inner wall of the fixing sleeve, the fixing sleeve is fitted onto the proximal outer side of the outer tube, and the limiting cover abuts against the annular support.

[0020] Preferably, the slip ring includes a sliding sleeve and a slider. The slider is inserted into the sliding hole and extends out of the sliding hole on both sides. The slider has an L-shaped fixing groove inside, and the upper part of the steel wire is fixed in the L-shaped fixing groove. The sliding sleeve is sleeved on the outside of the core rod. The sliding sleeve has an installation groove that matches the slider. The sliding sleeve has a limiting groove at one end of the installation groove and a retaining groove at the other end of the installation groove. Limiting blocks that cooperate with the limiting groove are formed on both sides of one end of the slider. Retaining buckles that are snapped into the retaining groove are provided on both sides of the other end of the slider.

[0021] Preferably, the ring buckle is connected to the near end of the core rod.

[0022] The present invention adopts the above technical solution and has the following beneficial effects:

[0023] ① One of the jaws is fixedly connected to the connecting shaft or integrally formed into a whole, and then installed with the other jaw. It is then inserted into the C-shaped opening through the connecting shaft, so that the whole can rotate relative to the bracket. It is very convenient to assemble and disassemble, saving time and effort.

[0024] ② All parts of the endoscopic gripper, except for the steel wire, are made of non-toxic plastic, resulting in low cost.

[0025] ③ The finger ring, core rod, slip ring, fixing sleeve, outer tube, bracket, connecting rod, jaws and steel wire in the endoscopic gripper have a simple structure that makes them easy to connect and disassemble.

[0026] ④ The individual parts are easy to manufacture, which can reduce labor costs.

[0027] ⑥ The jaws of the pliers assembly are equipped with multiple toothed steps, which can easily squeeze and hold foreign objects. They are also equipped with anti-dislodgement hooks to effectively prevent foreign objects from falling off, resulting in better gripping effect. Attached Figure Description

[0028] Figure 1 This is a three-dimensional structural diagram of an endoscopic grasping forceps.

[0029] Figure 2 for Figure 1 Enlarged diagram of point D in the diagram.

[0030] Figure 3 This is a cross-sectional schematic diagram of the endoscopic grasping forceps.

[0031] Figure 4 for Figure 3Enlarged diagram of point E.

[0032] Figure 5 This is a cross-sectional structural diagram of the fixing sleeve.

[0033] Figure 6 This is a schematic diagram of the opening arrangement on the core rod.

[0034] Figure 7 for Figure 4 Enlarged diagram of point C in the image.

[0035] Figure 8 This is a schematic diagram of the three-dimensional structure of the support.

[0036] Figure 9 This is a three-dimensional structural diagram of one of the pincers.

[0037] Figure 10 This is a three-dimensional structural diagram of the other claw.

[0038] Figure 11 This is a three-dimensional structural diagram of one of the connecting rods.

[0039] Figure 12 This is a three-dimensional structural diagram of another connecting rod. Detailed Implementation

[0040] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0041] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this 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.

[0042] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more, unless otherwise expressly defined.

[0043] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0044] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0045] like Figures 1-12 The endoscopic grasping forceps shown includes a core rod assembly, a connecting assembly, and a forceps head assembly, wherein,

[0046] The core rod assembly includes a finger ring 1, a core rod 2, a slip ring 3, and a fixing sleeve 4; the finger ring 1 is fixedly installed on the proximal end of the core rod 2, the slip ring 3 is slidably disposed on the core rod 2 through a sliding hole 5 on the core rod 2, an opening 6 communicating with the sliding hole 5 is provided on the proximal side wall of the core rod 2, the connecting assembly is embedded in the opening 6, the fixing sleeve 4 is sleeved on the distal end of the core rod 2 and covers the opening 6, and the core rod 2 is connected to the pliers head assembly through the connecting assembly;

[0047] The connecting assembly includes a steel wire 7 and an outer tube 8; the steel wire 7 is inserted into the outer tube 8, the proximal end of the steel wire 7 extends into the sliding hole 5 of the core rod 2 and is fixedly connected to the slip ring 3, and the distal end of the steel wire 7 extends out of the outer tube 8 and is connected to the pliers assembly; the proximal end of the outer tube 8 is fixedly connected to the fixing sleeve 4 and the core rod 2, and the distal end of the outer tube 8 is connected to the pliers assembly.

[0048] The clamp assembly includes a bracket 9, connecting rods 10, and clamping jaws 11. The proximal end of the bracket 9 is fixedly connected to the outer tube 8, and the bracket 9 has an installation port 12. Two connecting rods 10 are disposed in the installation port 12, and one end of the two connecting rods 10 is hinged by a connecting pin 21. The distal end of the steel wire 7 is connected to the connecting pin 21. The other ends of the two connecting rods 10 are respectively hinged to the two clamping jaws 11 by a pin 19. The middle of the two clamping jaws 11 is hinged by a connecting shaft 17. The connecting shaft 17 is installed in the C-shaped openings 50 on both sides of the distal end of the bracket 9. The connecting shaft 17 is fixedly connected to one of the clamping jaws 11 or integrally formed.

[0049] The slip ring 3 can slide on the core rod 2 under the action of external force, thereby driving the steel wire 7 to move back and forth. The steel wire 7 drives the two jaws 11 to rotate relative to the bracket 9 to make opening and closing movements through the two connecting rods 10 respectively.

[0050] In the above technical solution, the endoscopic gripper forceps includes a core rod assembly, a connecting assembly, and a gripper head assembly. One gripper is fixedly connected to the connecting shaft or integrally formed into a single unit, and then installed with the other gripper. The forceps are then engaged in a C-shaped opening via the connecting shaft, allowing the entire unit to rotate relative to the support. This makes assembly and disassembly very convenient, saving time and effort. Furthermore, a slip ring in the core rod assembly is slidably mounted on the core rod. The opening at the bottom of the core rod facilitates the installation of the connecting assembly and allows for easy deformation, facilitating the installation of the fixing sleeve, which prevents the connecting assembly from detaching. A steel wire in the connecting assembly extends into a sliding hole and is fixed to the sliding sleeve. An outer tube is positioned outside the steel wire for reinforcement and protection. The outermost end of the steel wire is connected to a pair of connecting rods in the gripper head assembly. One gripper is hinged to the outside of each connecting rod. Therefore, pulling the slip ring moves the steel wire back and forth. The steel wire, through the two connecting rods, drives the two grippers to rotate relative to the support, performing an opening and closing motion to grasp or release foreign objects.

[0051] The finger rings, core rods, slip rings, fixing sleeves, outer tubes, supports, connecting rods, jaws, and steel wires in this endoscopic grasping forceps have a simple and easy-to-connect and disassemble structure.

[0052] Furthermore, the finger ring 1, core rod 2, slip ring 3, fixing sleeve 4, outer tube 8, bracket 9, connecting rod 10, jaws 11, and connecting shaft 17 are all plastic parts. In this technical solution, all parts of the endoscopic gripper, except for the steel wire, are made of non-toxic plastic parts, which is inexpensive, easy to produce, and can reduce labor costs.

[0053] like Figure 5 and 6As shown, the jaws 11 include a jaw body 13 and an S-shaped connecting block 14. The distal end of the jaw body 13 is provided with an inwardly biased arc-shaped anti-dislodgement hook 15. In this technical solution, after the two jaws grasp the foreign object, the anti-dislodgement hooks on both sides of the jaws can effectively prevent the foreign object from falling off. Specifically, one jaw has two downwardly biased arc-shaped anti-dislodgement hooks formed on its outer end, forming a mating opening between the two arc-shaped anti-dislodgement hooks. The other jaw has an upwardly biased arc-shaped anti-dislodgement hook formed on its outer end. When the pair of jaws are closed, one arc-shaped anti-dislodgement hook fits into the mating opening, making it easier to enter the human body.

[0054] In addition, the inner wall of the clamp body 13 is provided with a number of toothed steps 16. In this technical solution, the steps are inclined and the adjacent steps form a large drop, which can greatly increase the contact area between the foreign object and the inner end face of the clamp body, while increasing the friction between the foreign object and the foreign object, greatly improving the gripping ability of the clamp claws and further preventing it from falling off.

[0055] like Figure 5 As shown, an S-shaped connecting block 14 of one jaw 11 has a first connecting hole 18 that mates with a connecting shaft 17. The S-shaped connecting block 14 extends into the mounting opening 12 and is rotatably connected to the connecting shaft 17. In this technical solution, both the connecting shaft and the jaws are made of high-hardness plastic. One jaw has a first connecting hole. A preferred solution is that the connecting shaft and the other jaw are integrally injection molded into a single unit. This unit can rotate relative to the bracket. Thus, the two jaws can be rotatably connected by the first connecting hole and the connecting shaft. The S-shaped connecting block extending into the mounting opening facilitates assembly with the connecting rod.

[0056] like Figure 7 and Figure 8 As shown, the connecting rod 10 is fixedly connected to or integrally formed with the pin 19. The S-shaped connecting block 14 of the jaw 11 also has a second connecting hole 20 that mates with the pin 19. One connecting rod 10 has a connecting pin 21 fixedly connected to or integrally formed with it, and the other connecting rod 10 has a third connecting hole 22 that mates with the connecting pin 21. In this technical solution, the pin is formed on the connecting rod, resulting in high structural strength. Furthermore, the pin is wider inside and narrower outside, allowing space to be left on the connecting pin for fixing with the steel wire.

[0057] like Figure 3 As shown, the distal end of the core rod 2 is formed with a protrusion 23, and the proximal end of the outer tube 8 is provided with a limiting cover 24 that sleeves on the outside of the protrusion 23. In this technical solution, the cooperation between the protrusion and the limiting cover improves the assembly stability of the outer tube and plays a certain circumferential limiting role at the upper end of the outer tube. It should be noted that the outer end of the outer tube is tensioned and sleeved with the bracket, making disassembly and assembly convenient.

[0058] Furthermore, a ring of protrusions 25 is formed on the distal sidewall of the core rod 2, and a ring of grooves 26 that mate with the protrusions 25 is formed on the fixing sleeve 4. An annular support 27 is formed on the inner wall of the fixing sleeve 4. The fixing sleeve 4 is fitted onto the proximal outer side of the outer tube 8, and the limiting cover 24 abuts against the annular support 27. In this technical solution, the protrusions on the core rod and the grooves on the fixing sleeve effectively prevent the fixing sleeve from detaching. At the same time, the limiting cover of the outer tube abuts against the annular support inside the fixing sleeve, further securing the outer tube.

[0059] Furthermore, the slip ring 3 includes a sliding sleeve 28 and a slider 29. The slider 29 is inserted into the sliding hole 5 and extends out of the sliding hole 5 on both sides. The slider 29 has an L-shaped fixing groove 30 inside, and the upper part of the steel wire 7 is fixed in the L-shaped fixing groove 30. The sliding sleeve 28 is sleeved on the outside of the core rod 2. The sliding sleeve 28 has an installation groove 31 that matches the slider 29. The sliding sleeve 28 has a limiting groove 32 at one end of the installation groove 31 and a retaining groove 33 at the other end. The slider 29 has limiting blocks 34 on both sides of one end that cooperate with the limiting groove 32 for limiting. The slider 29 has buckles 35 on both sides of the other end that are connected to the retaining groove 33. In this technical solution, during installation, the slider is placed into the sliding hole. When the sliding sleeve slides along the upper end of the core rod to the slider, a quick connection is achieved through the cooperation of the buckles on the slider and the retaining grooves on the sliding sleeve. Both assembly and disassembly are very convenient.

[0060] Furthermore, the ring 1 is snapped onto the upper end of the core rod 2. In this technical solution, during installation, the snap-fit ​​connection can be achieved simply by pressing the lower end of the ring into the upper end of the core rod, which is very convenient.

[0061] In this specific embodiment, addressing the problems of complex structure, inconvenient assembly and disassembly, and high cost of existing endoscopic grasping forceps, the above solution divides the endoscopic grasping forceps into three parts: a core rod assembly, a connecting assembly, and a forceps head assembly. The core rod assembly includes a finger ring 1, a core rod 2, a slip ring 3, and a fixing sleeve 4; the connecting assembly includes a steel wire 7 and an outer tube 8; the forceps head assembly includes a bracket 9, a connecting rod 10, and a jaw 11; wherein: the slider of the slip ring is inserted into the sliding hole, the inner end of the steel wire is fixed to the slider, the slip sleeve of the slip ring is snapped onto the slider, the finger ring is snapped onto the core rod, the outer tube is sleeved on the outside of the steel wire and connected to the core rod, and the outer end of the outer tube is connected to the bracket. The clamping mechanism features a tight-fitting, fixed sleeve positioned outside the opening of the core rod. The outer end of the steel wire is secured to the connecting pin between the two connecting rods of the clamp head assembly. After one jaw of the clamp head assembly is assembled with the connecting shaft to form a single unit, it is then installed with the other jaw. The connecting shaft then engages with the C-shaped opening, allowing the entire assembly to rotate relative to the support. The jaws extend from both sides of the mounting opening and are installed with the connecting rods. Once assembled, pulling the slip ring causes the two jaws to open and close relative to each other. Except for the steel wire, all parts are made of non-toxic plastic, facilitating easy connection, assembly, and disassembly, making it easier to manufacture and cost-effective. Furthermore, the clamps feature inclined steps and anti-dislodgement hooks, significantly improving the gripping ability of polyps, tissues, and other foreign objects, preventing them from falling out.

[0062] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0063] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention.

Claims

1. An endoscopic grasper, characterized by: The utility model relates to a kind of pincers, including core rod assembly, connecting assembly and jaw assembly, wherein, The core rod assembly includes ring (1), core rod (2), sliding ring (3) and fixed sleeve (4);The ring (1) is fixedly installed at the proximal end of the core rod (2), the sliding ring (3) is slidably arranged on the core rod (2) by the sliding hole (5) on the core rod (2), the proximal end side wall of the core rod (2) is provided with the opening (6) communicated with the sliding hole (5), the connecting assembly is embedded in the opening (6), the fixed sleeve (4) is sleeved on the distal end of the core rod (2) and covers the opening (6), and the core rod (2) is connected with the jaw assembly by the connecting assembly. The connecting assembly includes steel wire (7) and outer tube (8);The steel wire (7) is arranged in the outer tube (8), the proximal end of the steel wire (7) is inserted into the sliding hole (5) of the core rod (2) and is fixedly connected with the sliding ring (3), the distal end of the steel wire (7) is connected with the jaw assembly and extends out of the outer tube (8);The proximal end of the outer tube (8) is fixedly connected with the fixed sleeve (4) and the core rod (2), and the distal end of the outer tube (8) is connected with the jaw assembly. The jaw assembly includes support (9), connecting rod (10) and jaw (11);The proximal end of the support (9) is fixedly connected with the outer tube (8), and the support (9) is provided with mounting port (12);Two connecting rods (10) are arranged in the mounting port (12), and one end of the two connecting rods (10) is hingedly connected by connecting pin (21), and the distal end of the steel wire (7) is connected with the connecting pin (21);The other end of the two connecting rods (10) is respectively hingedly connected with two jaws (11) by pin shaft (19) respectively;The middle part of the two jaws (11) is hingedly connected by connecting shaft (17), the connecting shaft (17) is installed in the C-shaped opening (50) on the two sides of the distal end of the support (9), and the connecting shaft (17) is fixedly connected with one of the jaws (11) or integrally formed. The sliding ring (3) can slide on the core rod (2) under the action of external force, thereby driving the steel wire (7) to move forward and backward, and the steel wire (7) drives the two jaws (11) to rotate relative to the support (9) to open and close by the two connecting rods (10) respectively.

2. The graspers according to claim 1, wherein: The jaw (11) includes jaw body (13) and S-shaped connecting block (14), and the distal end of the jaw body (13) is provided with an inwardly-biased arc-shaped anti-unhooking hook (15).

3. The graspers according to claim 2, wherein: A plurality of tooth-shaped steps (16) are provided on the inner wall of the jaw body (13).

4. The graspers according to claim 2, wherein: A first connecting hole (18) is formed in the S-shaped connecting block (14) of one jaw (11) and matched with the connecting shaft (17), the S-shaped connecting block (14) extends into the mounting port (12) and is rotatably connected to the connecting shaft (17).

5. The graspers according to claim 4, wherein: The connecting rod (10) is fixedly connected with the pin shaft (19) or integrally formed, a second connecting hole (20) is formed in the S-shaped connecting block (14) of the jaw (11) and matched with the pin shaft (19), one of the connecting rods (10) is fixedly connected with the connecting pin (21) or integrally formed, and the other connecting rod (10) is provided with a third connecting hole (22) matched with the connecting pin (21).

6. The graspers according to claim 5, wherein: The finger ring (1), the core rod (2), the sliding ring (3), the fixed sleeve (4), the outer tube (8), the support (9), the connecting rod (10), the claw (11) and the connecting shaft (17) are plastic parts.

7. The graspers according to claim 1, wherein: The distal end of the core rod (2) is formed with a protrusion (23), and the proximal end of the outer tube (8) is provided with a limiting cover (24) sleeved outside the protrusion (23).

8. The graspers according to claim 7, wherein: The distal end of the core rod (2) is formed with a protrusion (23), and the proximal end of the outer tube (8) is provided with a limiting cover (24) sleeved outside the protrusion (23).

9. The graspers according to claim 1, wherein: The distal end of the core rod (2) is formed with a protrusion (23), and the proximal end of the outer tube (8) is provided with a limiting cover (24) sleeved outside the protrusion (23).

10. The graspers according to claim 9, wherein: The sliding ring (3) comprises a sliding sleeve (28) and a sliding block (29), the sliding block (29) is inserted into the sliding hole (5) and extends out of the sliding hole (5) on both sides, the inside of the sliding block (29) is provided with an L-shaped fixing groove (30), the upper part of the steel wire (7) is fixed in the L-shaped fixing groove (30); the sliding sleeve (28) is sleeved outside the core rod (2), the sliding sleeve (28) is provided with a mounting groove (31) matched with the sliding block (29) in the inside, the sliding sleeve (28) is provided with a limiting groove (32) at one end of the mounting groove (31), the sliding sleeve (28) is provided with a clamping groove (33) at the other end of the mounting groove (31), the two sides of one end of the sliding block (29) are formed with limiting blocks (34) matched with the limiting groove (32) for limiting, the two sides of the other end of the sliding block (29) are provided with buckles (35) buckled with the clamping groove (33). The finger ring (1) is buckled to the proximal end of the core rod (2).

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