Arresting forceps

Abstract

The utility model discloses a pair of arresting forceps, which comprises a handle part, a tube body and a forceps part, and the handle part comprises a handle main body, a bending control unit and a clamping control unit; the clamp part is connected with the front end of the tube body; a pull wire and a pull rod are arranged along the extending direction between the handle part and the tube body, the front end of the pull wire is used for controlling the bending of the front end of the tube body, and the rear end of the pull wire is controlled by the bending control unit; the front end of the pull rod is used for controlling clamping of the clamp part, and the rear end of the pull rod is controlled by the clamping control unit. The pair of arresting forceps can achieve efficient arresting and has a good bending adjusting function, and a doctor can operate the arresting forceps more conveniently through the handles.

Description

Technical Field

[0001] The utility model relates to the field of medical instruments, in particular to a grasping forceps. Background Art

[0002] With the improvement of people's living standards and the unhealthy living habits of some people, vascular diseases are a very common type of disease in modern society. For the treatment of vascular diseases, catheter intervention surgery plays an important role in modern medicine, and catheter intervention treatment is inseparable from corresponding medical surgical instruments. For example, when retrieving filters inserted into blood vessels, special grabbing forceps are needed. Although many structures of grabbing forceps are disclosed in the prior art, for example, patent CN217118686U discloses the basic use of grabbing forceps when capturing filters. However, this application does not pay attention to the fact that when the filter is tilted, the grabbing forceps have no bending function, and it is difficult to accurately capture the filter by continuously adjusting the position of the grabbing forceps. CN201920018683.1 discloses the basic functions of the grabbing forceps of the utility model. However, the bending angle of the grabbing forceps in this application is small; the tube body is made of copper, and the hardness of the tube body is too large to be used in tortuous blood vessels; the handle design is relatively simple, and the clamping of the forceps is controlled by threads, and the clamping speed of the forceps is slow and cannot be clamped at will.

[0003] The following technical problems are common when using the grasping forceps: 1. When retrieving the filter, the filter may tilt. The grasping forceps in the prior art either cannot achieve the bending function and the head end is relatively soft, or the bending angle is very small. It is difficult to grasp and retrieve the tilted filter, which greatly increases the difficulty of the doctor's operation and increases the operation time. 2. The adjustable bending grasping forceps in the prior art have a relatively rigid tube body structure, which is difficult to adapt to tortuous blood vessels, and the handle design is relatively simple, which cannot achieve quick clamping. Utility Model Content

[0004] Purpose of the utility model: In order to overcome the defects in the above-mentioned prior art, the utility model discloses a grasping pliers.

[0005] Technical solution: A grasping pliers, comprising a handle portion, a tube body and a pliers portion, wherein the handle portion comprises a handle body, a bending control unit and a clamping control unit; the pliers portion is connected to the front end of the tube body; a pull wire and a pull rod are arranged along the extension direction between the handle portion and the tube body, the front end of the pull wire is used to control the bending of the front end of the tube body, and the rear end of the pull wire is controlled by the bending control unit; the front end of the pull rod is used to control the clamping of the pliers portion, and the rear end of the pull rod is controlled by the clamping control unit.

[0006] In some embodiments, the bending control unit includes a rotating cap and a screw. The rotating cap is mounted on the handle body and can rotate relative to the handle body. The rotating cap has an internal thread that mates with the screw. The handle body is connected to a screw slide rail. The screw can translate along the screw slide rail under the drive of the rotating cap. The rear end of the cable is fixedly connected to the screw.

[0007] In some embodiments, there are two relatively arranged screw slide rails.

[0008] In some embodiments, the handle body has an annular chute, and the rotating cap has a slider or a slide rail that mates with the annular chute.

[0009] In some embodiments, the screw has a cable fixing groove, and a fixing post is installed in the cable fixing groove. The cable is fixedly connected to the fixing post by welding.

[0010] In some embodiments, the clamping control unit includes a movable handle hinged to the handle body. The movable handle is connected to the rear end of the pull rod and can be used to pull the pull rod backward.

[0011] In some embodiments, the movable handle has a pull rod fixing groove. The rear end of the pull rod is connected with a terminal ball, and the terminal ball is located in the pull rod fixing groove.

[0012] In some embodiments, the pull rod fixing groove includes a receiving groove for receiving the terminal ball and a through rod groove that communicates with the receiving groove and is penetrated by the pull rod.

[0013] In some embodiments, the handle body has a first finger ring, and the movable handle has a second finger ring.

[0014] In some embodiments, the bending control unit includes an outer rotating cap, an inner rotating cap and a screw. The outer rotating cap can rotate relative to the handle body, and the outer rotating cap can rotate synchronously with the inner rotating cap. The inner rotating cap has a thread that mates with the screw. The handle body is connected to a screw slide rail. The screw can translate along the screw slide rail under the drive of the outer rotating cap. The rear end of the cable is fixedly connected to the screw.

[0015] In some embodiments, the handle body has an annular chute, and the outer rotating cap has a slider or a slide rail that mates with the annular chute.

[0016] In some embodiments, the screw has a cable fixing groove, and a fixing post is installed in the cable fixing groove. The cable is fixedly connected to the fixing post by welding.

[0017] In some embodiments, a push rod slide rail is provided at the handle body, and the clamping control unit includes a push rod capable of moving along the push rod slide rail, and the push rod is connected to the rear end of the pull rod.

[0018] In some embodiments, a round hole is provided at the end of the push rod, and the end of the pull rod is fixedly connected to the round hole.

[0019] In some embodiments, a limit groove is provided at the outer rotating cap, and a limit protrusion embedded in the limit groove is provided at the inner rotating cap.

[0020] In some embodiments, the tube body sequentially includes an outer tube, a braided layer, and a spring layer from outside to inside.

[0021] In some embodiments, the outer tube includes an adjustable bending section and a non-adjustable bending section, and the hardness of the adjustable bending section is less than that of the non-adjustable bending section.

[0022] In some embodiments, one end of the wire is connected to the pull ring.

[0023] In some embodiments, the pull ring is fixed to the distal end of the tube body.

[0024] In some embodiments, the thickness of the outer tube is between 0.1 mm and 0.4 mm, preferably 0.2 mm.

[0025] In some embodiments, the tube body further includes a polytetrafluoroethylene layer (i.e., PTFE layer).

[0026] In some embodiments, the inner diameter of the polytetrafluoroethylene layer is between 0.9 mm and 1.1 mm, preferably 1.0 mm.

[0027] In some embodiments, the outer diameter of the polytetrafluoroethylene layer is between 1 mm and 1.2 mm, preferably 1.1 mm.

[0028] In some embodiments, a polytetrafluoroethylene layer is provided between the spring layer and the braided layer, and the wire is located between the polytetrafluoroethylene layer and the spring layer.

[0029] In some embodiments, a polytetrafluoroethylene layer is provided inside the spring layer, and the wire is located between the braided layer and the spring layer.

[0030] In some embodiments, the outer diameter of the pull rod is between 0.6 mm and 1 mm, preferably 0.8 mm.

[0031] In some embodiments, the width of the wire is between 0.2 and 0.4 mm, preferably 0.3 mm.

[0032] In some embodiments, the thickness of the wire is between 0.05 mm and 0.2 mm, preferably 0.1 mm;

[0033] In some embodiments, the pull rod is covered with a PTFE film.

[0034] Thereby, the pushing property of the pull rod can be greatly enhanced, and the clamping of the pliers part can be made smoother.

[0035] In some embodiments, the front end of the wire is fixedly connected to the pliers part.

[0036] In some embodiments, the pliers part includes a shell assembly and two movable assemblies. The shell assembly includes a tubular shell and two support rods fixedly connected to the tubular shell. The movable assembly includes a pliers head, a pliers rod fixedly connected to the pliers head, and a driving rod hinged to the pliers rod. One end of the driving rod is hinged to the pliers rod, and the other end is hinged to the end of the pull rod. The two pliers rods and the two support rods are hinged to each other. The pull rod is inserted into the tubular shell, and the tubular shell is connected to the end of the outer tube.

[0037] In some embodiments, the front end of the wire is fixedly connected to the tubular shell.

[0038] In some embodiments, the front end of the tube body has a spring piece.

[0039] In some embodiments, the pliers head has biting teeth, and the cross section of the biting teeth is triangular, semicircular or wavy.

[0040] In some embodiments, the pliers head has a dot array protrusion.

[0041] In some embodiments, the pliers head has a wavy serrated part.

[0042] In some embodiments, the pliers head is in the shape of an eagle's beak.

[0043] Advantageous effects: The capture pliers of the present utility model have the following advantages compared with the prior art:

[0044] 1. This capture pliers can be used not only for retrieving filters, but also for capturing other capturable foreign bodies in blood vessels.

[0045] 2. This capture pliers has a better bending adjustment function and a softer tube body material on the basis of the existing capture pliers, and can be suitable for tortuous blood vessels.

[0046] 3. The handle design of this capture pliers is more beautiful and more convenient for surgeons to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 It is a schematic diagram of the capture pliers;

[0048] Figure 2 It is a schematic cross-sectional view of the capture pliers;

[0049] Figure 3 Schematic diagram of the movable handle

[0050] Figure 4 Schematic diagram of the handle body

[0051] Figure 5 Schematic diagram of the screw rod

[0052] Figure 6 Schematic diagram of another bending and clamping control structure

[0053] Figure 7 Three-dimensional schematic diagram of another bending and clamping control structure

[0054] Figure 8 Cross-sectional schematic diagram of another bending and clamping control structure

[0055] Figure 9 Schematic diagram of the inner rotating cap

[0056] Figure 10 Schematic diagram of the push rod

[0057] Figure 11 Schematic diagram of the screw rod

[0058] Figure 12 Schematic diagram of the pipe body structure

[0059] Figure 13 Cross-sectional schematic diagram of the cooperation of the pipe body, wire rope, pull rod and elastic sheet

[0060] Figure 14 Cross-sectional schematic diagram of the pipe body with another structure

[0061] Figure 15 Schematic diagram of the clamping part Detailed implementation manners

[0062] Reference numerals: 1.1 Handle body; 1.2 Movable handle; 1.2.1 Pull rod fixing groove; 1.3 Screw rod slide rail; 1.4 Rotating cap; 1.5 Screw rod; 1.5.1 Wire rope fixing groove

[0063] 2.1 Outer rotating cap; 2.2 Inner rotating cap; 2.2.1 Limiting protrusion; 2.3 Push rod; 2.4 Screw rod; 2.5 Screw rod slide rail; 2.6 Push rod slide rail; 2.7 Handle body of another bending and clamping control structure

[0064] 3.1 Outer pipe; 3.1.1 Adjustable bending section; 3.2 Braided layer; 3.3 Polytetrafluoroethylene layer; 3.4 Spring layer; 3.5 Wire rope; 3.6 Pull rod; 3.7 Elastic sheet

[0065] 4.1 Tubular housing; 4.2 Support rod; 4.3 Clamping head; 4.4 Clamping rod; 4.5 Driving rod

[0066] As shown Figures 1-5 in the figure, a capture clamp includes a handle part, a tube body, and a clamp part. The handle part includes a handle main body 1.1, a bending control unit, and a clamping control unit; the clamp part is connected to the front end of the tube body; a wire 3.5 and a pull rod 3.6 are arranged along the extending direction between the handle part and the tube body. The front end of the wire 3.5 is used to control the bending of the front end of the tube body, and the rear end of the wire 3.5 is controlled by the bending control unit; the front end of the pull rod 3.6 is used to control the clamping of the clamp part, and the rear end of the pull rod 3.6 is controlled by the clamping control unit.

[0067] In some embodiments, the bending control unit includes a rotating cap 1.4 and a screw 1.5. The rotating cap 1.4 is installed at the handle main body 1.1 and can rotate relative to the handle main body 1.1. The rotating cap 1.4 has an internal thread that cooperates with the screw 1.5. The handle main body 1.1 is connected with a screw slide rail 1.3. The screw 1.5 can translate along the screw slide rail 1.3 under the drive of the rotating cap 1.4. The rear end of the wire 3.5 is fixedly connected to the screw 1.5.

[0068] The implementation process of the bending function: By rotating the rotating cap 1.4, the screw 1.5 is driven to move backward. While the screw 1.5 moves backward, the wire 3.5 also moves backward, so that the head end of the capture clamp bends.

[0069] In some embodiments, the screw slide rail 1.3 includes two that are arranged oppositely.

[0070] Thus, the translation of the screw is more stable.

[0071] In some embodiments, the handle main body 1.1 has an annular chute, and the rotating cap has a slider or a slide rail that cooperates with the annular chute.

[0072] In some embodiments, the screw 1.5 has a wire fixing groove 1.5.1, a fixing column is installed in the wire fixing groove 1.5.1, and the wire 3.5 is fixedly welded to the fixing column.

[0073] Thus, the translation of the screw can be effectively transmitted to the wire.

[0074] In some embodiments, the clamping control unit includes a movable handle 1.2 that is hinged to the handle main body 1.1. The movable handle 1.2 is connected to the rear end of the pull rod 3.6 and can be used to pull the pull rod 3.6 backward.

[0075] In some embodiments, the movable handle 1.2 has a pull rod fixing groove 1.2.1. The rear end of the pull rod 1.2 is connected with a terminal ball, and the terminal ball is located in the pull rod fixing groove 1.2.1.

[0076] Thus, the operation of the movable handle can effectively drive the pull rod.

[0077] In some embodiments, the pull rod fixing groove 1.2.1 includes a receiving groove for receiving the end spherical ball and a rod passing groove that communicates with the receiving groove and through which the pull rod passes.

[0078] In some embodiments, the handle body has a first finger ring, and the movable handle has a second finger ring.

[0079] Process of controlling the clamping of the clamping part: Embed the end spherical ball at the tail end of the pull rod 3.6 into the pull rod fixing groove 1.2.1, and then rotate the movable handle 1.2 up and down to achieve the clamping of the clamping part.

[0080] This handle design has a more beautiful appearance; the clamping control of the clamping part and the bending control are integrated, which is more convenient for doctors to use; the design of using a scissors-like structure for controlling the clamping of the clamping part can easily and conveniently control the clamping of the clamping part.

[0081] As Figures 6-11 shown, in another bending structure, the bending control unit includes an outer rotating cap 2.1, an inner rotating cap 2.2 and a screw rod 2.4. The outer rotating cap 2.1 can rotate relative to the handle body 2.7. The outer rotating cap 2.1 can rotate synchronously with the inner rotating cap 2.2. The inner rotating cap 2.2 has a thread that cooperates with the screw rod 2.4. The handle body 2.7 is connected with a screw rod slide rail 2.5. The screw rod 2.4 can translate along the screw rod slide rail 2.5 under the drive of the outer rotating cap 2.1. The rear end of the cable 3.5 is fixedly connected with the screw rod 2.4.

[0082] In some embodiments, the handle body 2.7 has an annular sliding groove, and the outer rotating cap 2.1 has a slider or a slide rail that cooperates with the annular sliding groove.

[0083] In some embodiments, the screw rod 2.4 has a cable fixing groove, and a fixing post is installed in the cable fixing groove. The cable 3.5 is fixedly welded to the fixing post.

[0084] Thus, the translation of the screw rod can pull the cable.

[0085] In some embodiments, the handle body 2.7 has a push rod slide rail 2.6. The clamping control unit includes a push rod 2.3 that can move along the push rod slide rail 2.6. The push rod 2.3 is connected to the rear end of the pull rod 3.6.

[0086] In some embodiments, the end of the push rod 2.3 has a round hole, and the end of the pull rod 3.6 is fixedly connected to the round hole.

[0087] In some embodiments, the outer rotating cap 2.1 has a limiting groove, and the inner rotating cap 2.2 has a limiting protrusion 2.2.1 that is embedded in the limiting groove, thereby achieving the function of limiting and fixing.

[0088] During the bending operation, by rotating the outer rotating cap, the screw rod is driven to move backward. While the screw rod moves backward, the wire will also move backward, thereby bending the distal end of the capture forceps.

[0089] The process of controlling the clamping of the forceps part: The clamping of the forceps part can be achieved by pushing the push rod forward and backward.

[0090] This handle design has a more beautiful appearance; the clamping control and bending control of the forceps part are integrated, which is more convenient for doctors to use; the design of using a sliding structure for controlling the clamping of the forceps part can not only easily and conveniently control the clamping of the forceps part, but also facilitate single-handed operation by doctors.

[0091] In some embodiments, the tube body sequentially includes an outer tube 3.1, a braided layer 3.2, and a spring layer 3.4 from outside to inside.

[0092] In some embodiments, the outer tube 3.1 includes an adjustable bending section 3.1.1 and a non-adjustable bending section, and the hardness of the adjustable bending section 3.1.1 is less than that of the non-adjustable bending section.

[0093] In some embodiments, the wire 3.5 is located between the braided layer 3.2 and the spring layer 3.4.

[0094] In some embodiments, one end of the wire 3.5 is connected to a pull ring, and the pull ring is fixed to the distal end of the tube body.

[0095] In some embodiments, the outer diameter of the pull rod 3.6 is between 0.6 mm and 1 mm, preferably 0.8 mm.

[0096] In some embodiments, the width of the wire 3.5 is between 0.2 and 0.4 mm, preferably 0.3 mm; the thickness of the wire 3.5 is between 0.05 mm and 0.2 mm, preferably 0.1 mm;

[0097] Specifically, in order to increase the bending strength, a relatively thick wire 3.5 with a width of 0.3 mm and a thickness of 0.1 mm is used for the wire. The wire 3.5 is welded to the pull ring and embedded between the braided layer 3.2 and the spring layer 3.4. The overall tube body adopts the structure of spring layer 3.4 + braided layer 3.2 + outer tube 3.1, which enhances the overall toughness of the tube body. However, the hardness of the outer tube of the adjustable bending section 3.1.1 is less than that of the non-adjustable bending section, so that the front end is easier to bend and the risk of the wire breaking can also be reduced.

[0098] In some embodiments, the thickness of the outer tube is between 0.1 mm and 0.4 mm, preferably 0.2 mm.

[0099] In some embodiments, the tube body further includes a polytetrafluoroethylene layer.

[0100] In some embodiments, the inner diameter of the polytetrafluoroethylene layer 3.3 is between 0.9 mm and 1.1 mm, preferably 1.0 mm.

[0101] In some embodiments, the outer diameter of the polytetrafluoroethylene layer 3.3 is between 1 mm and 1.2 mm, preferably 1.1 mm.

[0102] In some embodiments, as Figures 12-13 shown, there is a polytetrafluoroethylene layer 3.3 between the spring layer 3.4 and the braided layer 3.2, and the pull wire 3.5 is between the polytetrafluoroethylene layer 3.3 and the spring layer 3.4.

[0103] In some other embodiments, as Figure 14 shown, there is a polytetrafluoroethylene layer inside the spring layer 3.4, and the pull wire 3.5 is located between the braided layer 3.2 and the spring layer 3.4.

[0104] In some embodiments, the front end of the pull wire 3.5 is fixedly connected to the clamping part.

[0105] In some embodiments, a relatively thick pull rod 3.6 is selected, which can prevent the pull rod from bending during the process of controlling the clamping of the clamping part.

[0106] In some embodiments, the pull rod 3.6 is covered with a PTFE film, which can greatly enhance the pushing performance of the pull rod, so that the clamping of the clamping part is smoother. The tube body of this structure has sufficient toughness and is much softer than the tube body of the existing adjustable-bending capture forceps.

[0107] In some embodiments, as Figure 15 shown, the clamping part includes a shell assembly and two movable assemblies. The shell assembly includes a tubular shell 4.1 and two support rods 4.2 fixedly connected to the tubular shell 4.1. The movable assembly includes a clamp head 4.3, a clamp rod 4.4 fixedly connected to the clamp head 4.3, and a driving rod 4.5 hinged to the clamp rod 4.4. One end of the driving rod 4.5 is hinged to the clamp rod 4.4, and the other end is hinged to the end of the pull rod 3.6. The two clamp rods 4.4 and the two support rods 4.2 are hinged to each other. The pull rod 3.6 is inserted into the tubular shell 4.1, and the tubular shell 4.1 is connected to the end of the outer tube 3.1.

[0108] In some embodiments, the front end of the pull wire 3.5 is fixedly connected to the tubular shell 4.1.

[0109] To increase the bending strength, a relatively thick wire with a width of 0.3 mm and a thickness of 0.1 mm is used for the wire rope, and the wire rope is welded to the tubular housing of the clamping part. To enhance the overall toughness of the tube body, a relatively thick braided wire and a relatively hard outer tube material are selected for the tube body. However, the hardness of the outer tube of the adjustable bending section is less than that of the non-adjustable bending section, which makes it easier to bend the front end and also reduces the risk of the wire rope breaking.

[0110] In some embodiments, the front end of the tube body has a spring piece 3.7.

[0111] Make the torsional resistance of the front end of the tube body better (the spring piece is welded to the metal tubular housing of the clamping part).

[0112] A relatively thick pull rod is selected to prevent the pull rod from bending during the process of controlling the clamping of the clamping part. The tube body of this structure has sufficient toughness and is much softer than the tube body of the existing adjustable bending capture pliers.

[0113] The clamping part is entirely composed of metal components. The front end of the clamping head is serrated, which can effectively increase the friction force and prevent the foreign object clamped from falling off; the rear end of the clamping head is hollowed out to adapt to the hooks of various filters when capturing the filter. If encountering the hook of a larger filter, the hook can be engulfed and the front end of the clamping head can be used for clamping. The pull rod is connected to the clamping head through a hinge structure and controls the opening and closing of the clamping head.

[0114] In some embodiments, the clamping head has biting teeth, and the cross section of the biting teeth is triangular, semicircular or wavy.

[0115] In some embodiments, the clamping head has dot array protrusions; or, the clamping head has a wavy serrated part; or, the clamping head is in the shape of an eagle's beak.

[0116] Although the present invention has been illustrated and described with respect to the preferred embodiments, those skilled in the art should understand that various changes and modifications can be made to the present invention as long as they do not exceed the scope defined by the claims of the present invention.

Claims

1. A capture clamp, characterized in that, It includes a handle part, a tube body and a clamping part. The handle part includes a handle main body, a bending control unit and a clamping control unit; the clamping part is connected to the front end of the tube body; a wire rope and a pull rod are arranged along the extending direction between the handle part and the tube body. The front end of the wire rope is used to control the bending of the front end of the tube body, and the rear end of the wire rope is controlled by the bending control unit; the front end of the pull rod is used to control the clamping of the clamping part, and the rear end of the pull rod is controlled by the clamping control unit.

2. The capture forceps according to claim 1, characterized in that, The bending control unit includes a rotating cap and a screw rod. The rotating cap is installed at the handle main body and can rotate relative to the handle main body. The rotating cap has an internal thread that cooperates with the screw rod. The handle main body is connected with a screw rod slide rail. The screw rod can translate along the screw rod slide rail under the drive of the rotating cap. The rear end of the wire rope is fixedly connected with the screw rod.

3. The capture forceps according to claim 2, characterized in that, The handle main body has an annular chute, and the rotating cap has a slider or a slide rail that cooperates with the annular chute; the screw rod has a wire rope fixing groove, and a fixing column is installed in the wire rope fixing groove. The wire rope is fixedly welded with the fixing column; the clamping control unit includes a movable handle hinged to the handle main body. The movable handle is connected to the rear end of the pull rod and can be used to pull the pull rod backward; the movable handle has a pull rod fixing groove, and the rear end of the pull rod is connected with a terminal ball, and the terminal ball is located in the pull rod fixing groove; the pull rod fixing groove includes a receiving groove for receiving the terminal ball and a through rod groove communicated with the receiving groove and penetrated by the pull rod; the handle main body has a first finger ring, and the movable handle has a second finger ring.

4. The capture forceps according to claim 1, characterized in that, The bending control unit includes an outer rotating cap, an inner rotating cap and a screw rod. The outer rotating cap can rotate relative to the handle main body, and the outer rotating cap can rotate synchronously with the inner rotating cap. The inner rotating cap has a thread that cooperates with the screw rod. The handle main body is connected with a screw rod slide rail. The screw rod can translate along the screw rod slide rail under the drive of the outer rotating cap. The rear end of the wire rope is fixedly connected with the screw rod.

5. The capture forceps according to claim 4, characterized in that, The handle main body has an annular chute, and the outer rotating cap has a slider or a slide rail that cooperates with the annular chute; the screw rod has a wire rope fixing groove, and a fixing column is installed in the wire rope fixing groove. The wire rope is fixedly welded with the fixing column; the handle main body has a push rod slide rail, and the clamping control unit includes a push rod that can move along the push rod slide rail. The push rod is connected to the rear end of the pull rod; a round hole is formed at the end of the push rod, and the end of the pull rod is fixedly connected with the round hole; the outer rotating cap has a limit groove, and the inner rotating cap has a limit protrusion embedded in the limit groove.

6. The capture forceps according to claim 1, characterized in that, The tube body sequentially includes an outer tube, a braided layer and a spring layer from outside to inside; the outer tube includes an adjustable bending section and a non-adjustable bending section, and the hardness of the adjustable bending section is less than that of the non-adjustable bending section; one end of the wire rope is connected with a pull ring, or one end of the wire rope is connected with the clamping part.

7. The capture forceps according to claim 6, characterized in that, The pipe body further includes a polytetrafluoroethylene layer; the inner diameter of the polytetrafluoroethylene layer is between 0.9 mm and 1.1 mm, and the outer diameter of the polytetrafluoroethylene layer is between 1 mm and 1.2 mm; the outer diameter of the pull rod is between 0.6 mm and 1 mm; the polytetrafluoroethylene layer is located between the spring layer and the braided layer, the wire is located between the polytetrafluoroethylene layer and the spring layer, or the polytetrafluoroethylene layer is located within the spring layer, and the wire is located between the braided layer and the spring layer.

8. The capture forceps according to claim 1, characterized in that, The width of the wire is between 0.2 and 0.4 mm; the thickness of the wire is between 0.05 mm and 0.2 mm.

9. The capture forceps according to claim 1, wherein The clamping part includes a shell assembly and two movable assemblies. The shell assembly includes a tubular shell and two support rods fixedly connected to the tubular shell. The movable assembly includes a clamping head, a clamping rod fixedly connected to the clamping head, and a driving rod hinged to the clamping rod. One end of the driving rod is hinged to the clamping rod, and the other end is hinged to the end of the pull rod. The two clamping rods and the two support rods are hinged together. The pull rod is inserted into the tubular shell, and the tubular shell is connected to the end of the outer tube.

10. The capture forceps according to claim 9, characterized in that, The clamping head has biting teeth, and the cross-section of the biting teeth is triangular, semicircular or wavy; alternatively, the clamping head has a dot array protrusion; alternatively, the clamping head has a wavy serrated part; alternatively, the clamping head is in the shape of an eagle's beak.

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