A self-breaking screw plug opening wrench

Abstract

This utility model discloses a self-breaking plug opening wrench, belonging to the field of medical device technology, aiming to solve the problem of inconvenient removal of the tail end after a self-breaking plug breaks. The wrench includes a handle assembly, a wrench rod, a central opening rod, an end clamp, a handle clamping block, a spring button, a compression spring, and a wave spring. The end clamp is connected to the front end of the central opening rod, which is axially movable and passes through the wrench rod. Pulling the handle clamping block backward moves the central opening rod backward, and the end clamp retracts, facilitating insertion of the wrench rod front end into the hexagonal hole of the plug. Upon release, the compression spring moves the central opening rod forward, and the end clamp opens and hooks the plug. After the plug breaks, the end clamp still hooks the broken part and is pulled out with the wrench. Pressing the spring button unlocks and allows the central opening rod to be pulled out for cleaning and disinfection. This utility model has a reliable structure and is simple to operate.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to a special operating tool for implanting and removing self-breaking screw-type implants in orthopedic, dental and other surgeries. Background Technology

[0002] In orthopedic internal fixation surgeries, self-breaking screw plugs are a commonly used implant. Doctors need to screw the screw plug into the bone or bone plate until it breaks at the designed fracture neck, thus ensuring precise implantation depth.

[0003] Currently, the wrench tools used to screw in such plugs are usually limited to clamping and rotating. When the plug breaks as designed, the useless tail (the broken part) remaining in the body often separates from the wrench tip and remains in the tissue. To remove this useless tail, it is usually necessary to use special grasping forceps or perform a secondary surgical operation. This not only prolongs the operation time and increases the patient's risk of trauma and infection, but also makes the operation more complicated. In addition, the internal structure of existing wrench tools is complex and inconvenient to completely disassemble, which makes it difficult to thoroughly clean and disinfect after the operation.

[0004] Therefore, there is an urgent need for a self-breaking plug operating tool that integrates clamping, rotation, and removal of broken parts into one unit, and is easy to disinfect. Utility Model Content

[0005] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a self-breaking plug opening wrench. This wrench can not only reliably clamp and rotate the self-breaking plug, but also safely remove the useless tail of the plug directly without replacing the tool after it breaks. In addition, the entire tool is easy to disassemble and thoroughly clean and disinfect.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A self-breaking plug opening wrench includes a handle assembly, a wrench handle, a central opening rod, and an end clamp. The handle assembly includes a handle inner core and a handle covering the inner core; the front end of the wrench handle is used for inserting a connection hole into an implant, preferably a hexagonal hole at the tail of the self-breaking plug, to transmit torque; the central opening rod passes through the wrench handle and is axially movable; the end clamp is connected to the front end of the central opening rod via an opening rod positioning block, and has an elastic structure that retracts when the central opening rod moves backward and expands when the central opening rod moves forward; the handle assembly is provided with a movable handle clamping block, which is connected to the central opening rod. The rear end is connected to drive the central support rod to move backward, and a spring button is used to lock or release the central support rod; the rear end of the central support rod is connected to the handle clamping block and is fitted with a first reset elastic element, which is a compression spring fitted on the central support rod, and one end of the compression spring is limited by a compression spring stop block; a second reset elastic element is provided between the handle inner core and the handle clamping block, which is a wave spring disposed between the handle inner core and the handle clamping block.

[0008] Furthermore, when the spring button is pressed, the locking of the central support rod can be released, thereby allowing the central support rod and connected end clamps and other components to be pulled out of the wrench handle as a whole for easy cleaning.

[0009] Furthermore, the wrench lever is provided with a support ring inside to provide a stable support surface for the compression spring.

[0010] Furthermore, the inner core of the handle and related components are circumferentially positioned by a C-shaped flat key to prevent relative rotation.

[0011] Furthermore, the handle is a silicone-coated handle.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] This invention features a unique expandable end clamp design. Even if the plug breaks after the screw insertion operation is completed, the end clamp can still firmly hook the useless tail. The doctor can simply pull out the wrench to remove it without changing instruments, simplifying the surgical procedure, improving efficiency, and reducing risks.

[0014] Users only need to hook the handle and tighten the block with one hand to retract the end clamp for installation. After releasing, the spring will automatically open and lock the implant, making the operation intuitive, labor-saving, and secure.

[0015] Pressing the spring button allows for the quick disassembly of core moving parts such as the central support rod, fully exposing the internal channels of the tool for thorough cleaning and high-temperature, high-pressure sterilization, thus meeting the stringent sterility requirements of medical devices.

[0016] The optimized silicone handle provides a better surgical grip and anti-slip properties. The combination of the end clip and the expansion rod ensures a reliable connection with the inner wall of the implant. The locking mechanism of the spring button and the expansion rod makes dragging and disassembly movements smoother and more reliable. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a partial cross-sectional schematic diagram of the present invention.

[0019] In the diagram: 1. End clamp; 2. Wrench lever; 3. Center support rod; 4. Handle clamping block; 5. Spring button; 6. Compression spring stop block; 7. Handle inner core; 8. C-shaped flat key; 9. Handle; 10. Wave spring; 11. Compression spring; 12. Support rod positioning block; 13. Support ring. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Example 1, such as Figures 1-2 As shown, a self-breaking plug opening wrench includes a handle assembly 9, a wrench lever 2, a central opening rod 3, and an end clamp 1. The handle assembly 9 includes a handle core 7 and a silicone handle 9 covering the core. The front end of the wrench lever 2 is used to insert into the hexagonal hole of the implant to transmit torque. The central opening rod 3 passes through the inside of the wrench lever 2 and can move axially. The end clamp 1 is connected to the front end of the central opening rod 3 through an opening rod positioning block 12, and has an elastic structure that retracts when the central opening rod 3 moves backward and opens when the central opening rod 3 moves forward. The handle assembly 9 is provided with a pull clamping block 4 that can be operated to drive the central opening rod 3 to move backward, and a spring button 5 for locking or releasing the central opening rod 3. The rear end of the central opening rod 3 is connected to the pull clamping block 4 and is fitted with a compression spring 11 to reset it. One end of the compression spring 11 is limited by a spring stop block 6. A wave spring 10 that provides auxiliary rebound force is provided between the handle core 7 and the pull clamping block 4.

[0022] When the spring button 5 is pressed, the locking of the central support rod 3 can be released, allowing the central support rod 3 and the connected end clamp 1 and other components to be pulled out of the wrench handle 2 as a whole for easy cleaning. The wrench handle 2 is provided with a support ring 13 to provide a stable support surface for the compression spring 11. The handle core 7 and related components are circumferentially positioned by a C-shaped flat key 8 to prevent relative rotation.

[0023] In a preferred embodiment, the main structure of this utility model includes an end clamp 1, a wrench lever 2, a central support rod 3, and a handle assembly arranged sequentially from front to back. The handle assembly consists of an inner metal handle core 7 and an outer silicone handle 9, providing a comfortable and non-slip grip. The front end of the wrench lever 2 is hexagonal and is used to insert into the hexagonal hole at the tail of the self-breaking plug. The central support rod 3 passes through the inside of the wrench lever 2, and its rear end is connected to the handle clamping block 4. Its front end is connected to the end clamp 1 through the support rod positioning block 12. The end clamp 1 is usually made of an elastic metal sheet and is in a slightly open outward shape in its natural state.

[0024] In this embodiment, the first reset elastic element is a compression spring 11 sleeved on the central support rod 3, and one end of the compression spring 11 is limited by the spring stop block 6; the second reset elastic element is a wave spring 10 disposed between the handle inner core 7 and the handle clamping block 4; the front end of the wrench rod 2 is used to insert the connection hole of the implant, which is a hexagonal hole at the tail of the self-breaking screw plug; the handle clamping block 4 is movably disposed on the handle assembly and is used to drive the central support rod 3 to move backward; the handle inner core 7 and the relevant connecting parts are circumferentially positioned by a C-shaped flat key 8 to prevent relative rotation; the handle 9 is a silicone-coated handle.

[0025] A compression spring 11 is fitted on the central support rod 3. The front end of the compression spring 11 abuts against the internal step of the wrench handle 2 or a specially designed support ring 13, and the rear end is limited by the spring stop block 6 fixed on the central support rod 3. A wave spring 10 is installed between the handle core 7 and the handle clamping block 4. A spring button 5 is provided on the handle clamping block 4. The button locks the central support rod 3 by engaging with the groove on the central support rod 3 through an internal buckle or pin mechanism.

[0026] Work process:

[0027] During the procedure, the doctor holds the silicone handle 9, hooks the lever clamping block 4 with their index and middle fingers, and pulls it towards the handle. The lever clamping block 4 causes the central expansion rod 3 to move backward against the elastic force of the compression spring 11, causing the end clamp 1 at the front end to be pulled into the tapered hole at the front end of the wrench rod 2 or to contract radially due to the pressure of the internal structure. At this time, the front end of the wrench rod 2 is inserted into the hexagonal hole of the self-breaking plug. The doctor releases their fingers, and under the rebound force of the compression spring 11, the central expansion rod 3 returns to its original position. The end clamp 1 loses its constraint and elastically expands, with its outer edge engaging the internal cavity or groove of the plug, thereby hooking and locking the plug from the inside. The doctor can then rotate the handle to perform the screw-in operation.

[0028] When the screw plug is turned to the predetermined torque and breaks, its useless tail (broken part) is still firmly hooked by the spread end clamp 1. The doctor does not need to do any additional operation. He can simply pull the entire wrench out axially to remove the useless part from the body.

[0029] After the operation, press the spring button 5 to release its lock on the central support rod 3. At this time, you can hold the handle clamping block 4 and pull the central support rod 3, end clamp 1, compression spring 11 and other components out from the back of the wrench rod 2 as a whole module. The wrench rod 2 will form a smooth channel inside, which can be thoroughly cleaned and disinfected together with the disassembled module. When assembling, insert the module back in and listen for the sound of the spring button 5 resetting and locking.

[0030] In the embodiments of this utility model, the fixing between various metal parts can be achieved by laser welding or argon arc welding. For example, the final fixing of the handle inner core 7 and related parts can be achieved by laser welding to ensure connection strength. Positioning parts such as cylindrical pins are installed with tight fit.

[0031] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A self-disconnecting plug spanner characterized in that, include: The handle assembly includes a handle core (7) and a handle (9) covering the outside of it. The wrench handle (2) has a connection hole for inserting the implant; The central support rod (3) is axially movable and passes through the inside of the wrench rod (2); The end clamp (1) is connected to the front end of the central support rod (3) via the support rod positioning block (12) and has an elastic structure that can be retracted and expanded; The handle clamping block (4) is movably mounted on the handle assembly and connected to the rear end of the central support rod (3) to drive the central support rod (3) to move axially. A spring button (5) is provided on the handle assembly for locking or releasing the central support rod (3). The first reset elastic element is a compression spring (11) sleeved on the central support rod (3), and one end of the compression spring (11) is limited by the compression spring stop (6); The second reset elastic element is a wave spring (10) disposed between the inner core of the handle (7) and the handle pressing block (4).

2. A self-disconnecting split plug spreader wrench according to claim 1, wherein, When the spring button (5) is pressed, the locking of the center support rod (3) can be released, so that the center support rod (3) can be pulled out from the wrench rod (2).

3. A self-disconnecting split plug spreader wrench according to claim 1, wherein, The wrench handle (2) has a support ring (13) inside, which provides axial support for the compression spring (11).

4. The self-disconnecting split plug spreader wrench of claim 1, wherein, The handle core (7) and related connecting parts are circumferentially positioned by a C-shaped flat key (8).

5. The self-disconnecting split plug spreader wrench of claim 1, wherein, The handle (9) is a silicone-coated handle.

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