Arresting forceps
By introducing pull wire and pull rod curved structure and movable handle design into the grab clamp, the problem that grab clamps in the prior art is difficult to adapt to the tilt filter and tortuous blood vessels is solved, and more efficient grabbing and operation convenience is achieved.
Patent Information
- Application Number
- CN202411236901.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-05
- Publication Date
- 2024-12-20
AI Technical Summary
The existing capture forceps are difficult to accurately capture when recycling the inclined filter, and the tube body is stiff and cannot adapt to tortuated blood vessels. The handle design is simple and slow, which increases the difficulty and time of surgery.
A grabber includes a handle, tube body and clamping part is designed. The curve function is realized through a combined structure of the pull wire and the pull rod. The handle body is matched with the screw slide rail. The clamping control unit adopts a movable handle and push rod slide rail. The tube body adopts an adjustable curved section and a spring layer structure to enhance flexibility and clamping force.
The function of accurately capturing and adapting to tortuated blood vessels on the tilting filter is realized, which improves the operation convenience and speed of the operation and reduces the difficulty and time of the doctor's surgery.
Smart Images
Figure CN119157666A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of medical devices, and 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 this application. However, the bending angle of the grabbing forceps of 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. Summary of the invention
[0004] Purpose of the invention: In order to overcome the defects in the above-mentioned prior art, the present application discloses a grasping forceps.
[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 installed on the handle body and can rotate relative to the handle body. The rotating cap has an internal thread that cooperates 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 pull wire is fixedly connected to the screw.
[0007] In some embodiments, the screw rails include two screw rails that are arranged opposite to each other.
[0008] In some embodiments, the handle body has a circular groove, and the rotating cap has a slider or a slide rail that cooperates with the circular groove.
[0009] In some embodiments, the screw rod has a wire fixing groove, a fixing column is installed in the wire fixing groove, and the wire is fixed to the fixing column 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 backwards.
[0011] In some embodiments, the movable handle has a pull rod fixing groove, and the rear end of the pull rod is connected to an end ball, and the end 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 end ball and a rod passing groove which is connected to the receiving groove and is passed through 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 cooperates 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, and the rear end of the pull wire is fixedly connected to the screw.
[0015] In some embodiments, the handle body has a circular groove, and the outer rotating cap has a slider or a slide rail that cooperates with the circular groove.
[0016] In some embodiments, the screw rod has a wire fixing groove, a fixing column is installed in the wire fixing groove, and the wire is fixed to the fixing column by welding.
[0017] In some embodiments, the handle body is provided with a push rod slide rail, 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, the end of the push rod has a circular hole, and the end of the pull rod is fixedly connected to the circular hole.
[0019] In some embodiments, the outer rotating cap has a limiting groove, and the inner rotating cap has a limiting protrusion embedded in the limiting groove.
[0020] In some embodiments, the tube body includes an outer tube, a braided layer and a spring layer from the outside to the 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 the hardness of the non-adjustable bending section.
[0022] In some embodiments, one end of the pull wire is connected to a pull ring.
[0023] In some embodiments, the pull ring is fixed to the distal end of the tube body.
[0024] In some embodiments, the outer tube has a thickness between 0.1 mm and 0.4 mm, preferably 0.2 mm.
[0025] In some embodiments, the tube body further includes a polytetrafluoroethylene layer (ie, a 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 pull wire is located between the polytetrafluoroethylene layer and the spring layer.
[0029] In some embodiments, the spring layer has a polytetrafluoroethylene layer therein, and the pull 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 pull wire is between 0.2-0.4 mm, preferably 0.3 mm.
[0032] In some embodiments, the thickness of the pull wire is between 0.05 mm and 0.2 mm, preferably 0.1 mm;
[0033] In some embodiments, the tie rod is covered with a PTFE film.
[0034] Thereby, the pushing performance of the pull rod can be greatly enhanced, so that the clamping of the pliers is smoother.
[0035] In some embodiments, the front end of the pull wire is fixedly connected to the clamp.
[0036] In some embodiments, the pliers include 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 hingedly connected, 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 pull wire is fixedly connected to the tubular shell.
[0038] In some embodiments, the front end of the tube body has a spring sheet.
[0039] In some embodiments, the pliers head has teeth, and the cross-section of the teeth is triangular, semicircular or wavy.
[0040] In some embodiments, the pliers head has a dot array of protrusions.
[0041] In some embodiments, the pliers head has a wavy serration portion.
[0042] In some embodiments, the forceps head is hawk-beak shaped.
[0043] Beneficial effects: The grabbing forceps of the present application have the following advantages over the prior art:
[0044] 1. This grabbing forceps can not only be used to recover filters, but also can be used to capture other foreign bodies in blood vessels;
[0045] 2. Based on the existing grasping forceps, this grasping forceps has better bending function and softer tube material, which can be suitable for tortuous blood vessels;
[0046] 3. The handle design of this grasping forceps is more beautiful and easier for the surgeon to operate. BRIEF DESCRIPTION OF THE DRAWINGS
[0047] Figure 1 This is a schematic diagram of the catching forceps;
[0048] Figure 2 It is a schematic diagram of the cross section of the catching forceps;
[0049] Figure 3 It is a schematic diagram of the movable handle;
[0050] Figure 4 This is a schematic diagram of the handle body;
[0051] Figure 5 is a schematic diagram of a screw;
[0052] Figure 6 It is a schematic diagram of another bending and clamping control structure;
[0053] Figure 7 It is a three-dimensional schematic diagram of another bending and clamping control structure;
[0054] Figure 8 It is a cross-sectional schematic diagram of another bending adjustment and clamping control structure;
[0055] Fig. 9 It is a schematic diagram of the inner rotating cap;
[0056] Fig.10 Schematic diagram of the push rod;
[0057] Fig.11 is a schematic diagram of a screw;
[0058] Fig.12 It is a schematic diagram of the pipe body structure;
[0059] Fig.13 It is a schematic diagram of the cross section of the tube body, the pull wire, the pull rod and the spring;
[0060] Fig.14 A schematic diagram of a pipe cross section of another structure;
[0061] Fig.15 Schematic diagram of the clamp. DETAILED DESCRIPTION
[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 pull wire fixing groove;
[0063] 2.1 External rotating cap; 2.2 Internal rotating cap; 2.2.1 Position limiting protrusion; 2.3 Push rod; 2.4 Screw rod; 2.5 Screw rod slide rail; 2.6 Push rod slide rail; 2.7 Another handle body with a bending and clamping control structure;
[0064] 3.1 Outer tube; 3.1.1 Adjustable bend; 3.2 Braided layer; 3.3 Polytetrafluoroethylene layer; 3.4 Spring layer; 3.5 Pull wire; 3.6 Pull rod; 3.7 Shrapnel
[0065] 4.1 Tubular housing; 4.2 Support rod; 4.3 Clamp head; 4.4 Clamp rod; 4.5 Drive rod.
[0066] like Figure 1-5 As shown, a grasping forceps comprises a handle portion, a tube body and a pliers portion, wherein the handle portion comprises a handle body 1.1, 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 3.5 and a pull rod 3.6 are arranged along the extending direction between the handle portion and the tube body, the front end of the pull wire 3.5 is used to control the bending of the front end of the tube body, and the rear end of the pull 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 pliers portion, 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 on the handle body 1.1 and can rotate relative to the handle body 1.1. The rotating cap 1.4 has an internal thread that cooperates with the screw 1.5. The handle body 1.1 is connected to 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 pull wire 3.5 is fixedly connected to the screw 1.5.
[0068] The process of realizing the bending adjustment function is as follows: the rotating cap 1.4 is rotated to drive the screw rod 1.5 to move backwards, and when the screw rod 1.5 moves backwards, the pull wire 3.5 also moves backwards, so that the head end of the grabbing forceps is bent.
[0069] In some embodiments, the screw guide rails 1.3 include two guide rails that are arranged opposite to each other.
[0070] Thereby the translation of the screw is more stable.
[0071] In some embodiments, the handle body 1.1 has a circular groove, and the rotating cap has a slider or a slide rail that cooperates with the circular groove.
[0072] In some embodiments, the screw rod 1.5 has a pull wire fixing groove 1.5.1, a fixing column is installed in the pull wire fixing groove 1.5.1, and the pull wire 3.5 is welded and fixed to the fixing column.
[0073] Thereby, the translation of the screw can be effectively transmitted to the pull wire.
[0074] In some embodiments, the clamping control unit includes a movable handle 1.2 hinged to the handle 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 backwards.
[0075] In some embodiments, the movable handle 1.2 has a pull rod fixing groove 1.2.1, and the rear end of the pull rod 1.2 is connected to an end ball, and the end ball is located in the pull rod fixing groove 1.2.1.
[0076] Therefore, the pull rod can be effectively driven by operating the movable handle.
[0077] In some embodiments, the pull rod fixing groove 1.2.1 includes a receiving groove for receiving the end ball and a rod passing groove connected to the receiving groove and passed through by the pull rod.
[0078] In some embodiments, the handle body has a first finger ring, and the movable handle has a second finger ring.
[0079] The clamping process of the clamp is controlled as follows: the end ball at the tail end of the pull rod 3.6 is inserted into the pull rod fixing groove 1.2.1, and then the movable handle 1.2 is rotated up and down to realize the clamping of the clamp.
[0080] This handle design has a more beautiful appearance; the clamping control and bending control of the jaws are integrated into one, which is more convenient for doctors to use; the clamping control adopts a scissor-like structure design, which can easily and conveniently control the clamping of the jaws.
[0081] like Figure 6-11 As shown, in another bending adjustment structure, the bending adjustment control unit includes an outer rotating cap 2.1, an inner rotating cap 2.2 and a screw 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 2.4, the handle body 2.7 is connected to a screw rail 2.5, the screw 2.4 can translate along the screw rail 2.5 under the drive of the outer rotating cap 2.1, and the rear end of the pull wire 3.5 is fixedly connected to the screw 2.4.
[0082] In some embodiments, the handle body 2.7 has a circular groove, and the outer rotating cap 2.1 has a slider or a slide rail that cooperates with the circular groove.
[0083] In some embodiments, the screw rod 2.4 has a pull wire fixing groove, a fixing column is installed in the pull wire fixing groove, and the pull wire 3.5 is welded and fixed to the fixing column.
[0084] The translation of the screw can thus pull the pull wire.
[0085] In some embodiments, the handle body 2.7 is provided with a push rod slide rail 2.6, and the clamping control unit comprises a push rod 2.3 that can move along the push rod slide rail 2.6, and 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 circular hole, and the end of the pull rod 3.6 is fixedly connected to the circular 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 embedded in the limiting groove, so as to achieve the function of limiting and fixing.
[0088] During the bending operation, the outer rotating cap is rotated to drive the screw rod to move backwards. When the screw rod moves backwards, the pull wire will also move backwards, thereby bending the head end of the grabbing forceps.
[0089] Control the clamping process of the jaws: the clamping of the jaws 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 jaws are integrated into one, which is more convenient for doctors to use; the sliding structure design is used to control the clamping of the jaws, which can not only easily and conveniently control the clamping of the jaws, but also facilitate one-handed operation by doctors.
[0091] In some embodiments, the tube body includes, from outside to inside, an outer tube 3.1, a braided layer 3.2 and a spring layer 3.4.
[0092] In some embodiments, the outer tube 3.1 includes an adjustable bend section 3.1.1 and a non-adjustable bend section, and the hardness of the adjustable bend section 3.1.1 is less than the hardness of the non-adjustable bend section.
[0093] In some embodiments, the pull 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 pull 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 pull wire 3.5 is between 0.2-0.4 mm, preferably 0.3 mm; the thickness of the pull wire 3.5 is between 0.05 mm-0.2 mm, preferably 0.1 mm;
[0097] Specifically, in order to increase the bending strength, the pull wire adopts a thicker pull wire 3.5 with a width of 0.3mm and a thickness of 0.1mm. The pull wire 3.5 is welded on the pull ring and embedded between the braided layer 3.2 and the spring layer 3.4. The tube body as a whole adopts a 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 outer tube of the non-adjustable bending section, so that the front end is easier to bend and the risk of the pull wire breaking can be reduced.
[0098] In some embodiments, the outer tube has a thickness between 0.1 mm and 0.4 mm, preferably 0.2 mm.
[0099] In some embodiments, the tube body further comprises 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, Figure 12-13 As shown, a polytetrafluoroethylene layer 3.3 is provided between the spring layer 3.4 and the braided layer 3.2, and the pull wire 3.5 is provided between the polytetrafluoroethylene layer 3.3 and the spring layer 3.4.
[0103] In other embodiments, Fig.14 As shown, the spring layer 3.4 has a polytetrafluoroethylene layer inside, 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 clamp.
[0105] In some embodiments, a thicker pull rod 3.6 is selected to prevent the pull rod from bending during the process of controlling the clamping of the jaws.
[0106] In some embodiments, the 3.6 rod is coated with a PTFE film, which can greatly enhance the pushability of the rod, thereby making the clamping of the pliers smoother. The tube body of this structure has more than enough toughness and is much softer than the existing adjustable bend capture pliers.
[0107] In some embodiments, Fig.15 As shown, the pliers 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 pliers head 4.3, a pliers rod 4.4 fixedly connected to the pliers head 4.3 and a driving rod 4.5 hinged to the pliers rod 4.4, one end of the driving rod 4.5 is hinged to the pliers rod 4.4, and the other end is hinged to the end of the pull rod 3.6, the two pliers rods 4.4 and the two support rods 4.2 are hingedly connected, 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 housing 4.1.
[0109] In order to increase the bending strength, the pull wire uses a thicker pull wire with a width of 0.3mm and a thickness of 0.1mm, and the pull wire is welded to the tubular shell of the clamp. In order to enhance the overall toughness of the tube body, the tube body uses a thicker braided wire and a harder outer tube material. However, the hardness of the outer tube of the adjustable bending section is less than that of the outer tube of the non-adjustable bending section, in order to make the front end easier to bend and reduce the risk of the pull wire breaking.
[0110] In some embodiments, the front end of the tube body has a spring piece 3.7.
[0111] The torsion resistance of the front end of the tube body is improved (the spring piece is welded to the metal tubular shell of the clamp).
[0112] The use of a thicker pull rod can prevent the pull rod from bending during the clamping process of the control pliers. The pipe body of this structure has more than enough toughness and is much softer than the pipe body of the existing adjustable bending capture pliers.
[0113] The pliers are made entirely of metal parts. The front end of the pliers is serrated, which can effectively increase friction and prevent the foreign matter from falling off; the rear end of the pliers is hollowed out, so that it can adapt to various filter hooks when catching the filter. If you encounter a larger filter hook, you can swallow the hook and use the front end of the pliers to clamp it. The pull rod is connected to the pliers through a hinge structure and controls the opening and closing of the pliers.
[0114] In some embodiments, the pliers head has teeth, and the cross-section of the teeth is triangular, semicircular or wavy.
[0115] In some embodiments, the pliers head has a dot array of protrusions; or, the pliers head has a wavy serrated portion; or, the pliers head is shaped like an eagle's beak.
[0116] Although the present invention has been illustrated and described with respect to the preferred embodiments, it will be appreciated by those skilled in the art that various changes and modifications may be made to the present invention without departing from the scope of the present invention as defined by the claims.
Claims
1. A capture forceps, characterized in that: It comprises a handle portion, a tube body and a pliers portion, wherein the handle portion comprises a handle body, a bending adjustment 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 extending 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 adjustment 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.
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 on the handle body and can rotate relative to the handle body. The rotating cap has an internal thread that cooperates with the screw rod. The handle body is connected to 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 pull wire is fixedly connected to the screw rod.
3. The capture forceps according to claim 2, characterized in that: The handle body is provided with a circular groove, and the rotating cap is provided with a slider or a slide rail cooperating with the circular groove; the screw rod is provided with a wire fixing groove, a fixing column is installed in the wire fixing groove, and the wire is welded and fixed to the fixing column; 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; the movable handle has a pull rod fixing groove, the rear end of the pull rod is connected to an end ball, and the end ball is located in the pull rod fixing groove; the pull rod fixing groove includes a receiving groove for accommodating the end ball and a rod through groove connected to the receiving groove and passed by the pull rod; the handle body is provided with a first finger ring, and the movable handle is provided with 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. 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 cooperates 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, and the rear end of the pull wire is fixedly connected to the screw.
5. The capture forceps according to claim 4, characterized in that: The handle body is provided with a circular groove, and the outer rotating cap is provided with a slider or a slide rail matching the circular groove; the screw rod is provided with a pull wire fixing groove, a fixing column is installed in the pull wire fixing groove, and the pull wire is welded and fixed to the fixing column; the handle body is provided with a push rod slide rail, 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; the end of the push rod is provided with a circular hole, and the end of the pull rod is fixedly connected to the circular hole; the outer rotating cap is provided with a limiting groove, and the inner rotating cap is provided with a limiting protrusion embedded in the limiting groove.
6. The capture forceps according to claim 1, characterized in that: The tube body includes an outer tube, a braided layer and a spring layer from outside to inside; the outer tube includes an adjustable bend section and a non-adjustable bend section, and the hardness of the adjustable bend section is less than the hardness of the non-adjustable bend section; one end of the pull wire is connected to the pull ring, or one end of the pull wire is connected to the clamp.
7. The capture forceps according to claim 6, characterized in that: The tube body also includes a polytetrafluoroethylene layer; the inner diameter of the polytetrafluoroethylene layer is between 0.9mm-1.1mm, and the outer diameter of the polytetrafluoroethylene layer is between 1mm-1.2mm; the outer diameter of the pull rod is between 0.6mm-1mm; the polytetrafluoroethylene layer is located between the spring layer and the braided layer, and the pull wire is located between the polytetrafluoroethylene layer and the spring layer, or the polytetrafluoroethylene layer is located inside the spring layer, and the pull 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 pull wire is between 0.2-0.4 mm; the thickness of the pull wire is between 0.05 mm-0.2 mm.
9. The capture forceps according to claim 1, characterized in that: 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 hingedly connected, 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 pliers head has teeth, and the cross-section of the teeth is triangular, semicircular or wavy; or, the pliers head has a dot array of protrusions; or, the pliers head has a wavy serrated portion; or, the pliers head is in the shape of an eagle's beak.
Citation Information
Patent Citations
Filter forceps holder for medical vena cava operation
CN209464130U
Filter recovery device and system
CN217118686U