Screw plug extractor

Abstract

The utility model relates to a screw plug extractor, and belongs to the technical field of spine surgery. The tool is mainly used for solving the safety problems that a wrench fails due to deformation of a hexagonal hole or a plum blossom hole of a screw plug in a spinal operation, and metal fragments are generated due to the fact that a U-shaped nail arm needs to be damaged in a traditional taking-out method. According to the technical scheme, the tool is characterized by comprising a left clamping jaw, a right clamping jaw, a left linking arm, a right linking arm, a left handle, a right handle and screws; trapezoidal clamping grooves are formed in the heads of the clamping jaws, the size of the minimum ends of the clamping grooves is slightly smaller than that of U-shaped openings of the U-shaped nails, and R-shaped arc grooves are formed in the middles of the clamping grooves and used for clamping orthopedic rods; the handle adopts the extension arm design, and the operating force is reduced through the lever principle. During operation, the handle is folded to enable the clamping groove to be clamped into the U-shaped opening, the U-shaped opening is gradually expanded by about 0.5 mm, the screw plug is separated from the spine nail, and therefore the screw plug is taken out without damage. The tool is compact in structure and easy and convenient to operate, metal fragments can be effectively prevented from being generated, and the operation safety and efficiency are improved.

Description

Technical Field

[0001] This utility model is a screw plug remover, belonging to the field of spinal surgery technology, specifically relating to a tool for removing screw plugs that have been twisted and deformed in spinal screws. Background Technology

[0002] In spinal surgery, U-shaped screws are widely used. These screws are typically used in conjunction with connecting rods and hooks. The connection involves the connecting rod and the U-shaped screw being fixed together by a screw plug. The screw plug has external threads that mate with the internal threads of the U-shaped screw. The screw plug has a hexagonal or star-shaped hole inside. A hexagonal or star-shaped wrench is used to remove the screw plug and fix it into the U-shaped opening of the U-shaped screw. However, the hexagonal or star-shaped hole is prone to deformation during tightening, causing the wrench to lose its function. Once the hole is deformed, the screw plug loses its original function, and it must be removed. Another situation where screw plug removal is necessary is after the patient has regained function, when removing implanted nails, rods, etc., depending on the situation. The first step is to loosen the screw plug. Sometimes, due to tissue issues, the wrench cannot be inserted into the hexagonal or star-shaped hole of the screw plug. In this case, it is necessary to forcibly remove the screw plug to achieve the goal of gradual removal. The traditional method for removing deformed screw plugs is to break off one side of the U-shaped arm of the U-shaped screw. This method may result in the generation of metal fragments, posing a potential risk to the patient. Utility Model Content

[0003] The purpose of this invention is to provide a tool that can remove a deformed plug without producing any metal fragments, ensuring the safety and efficiency of the procedure.

[0004] This utility model mainly comprises the following parts: a left jaw 6, a right jaw 7, a left connecting arm 3, a right connecting arm 8, a left handle 1, a right handle 9, and screws A2, B4, and C5. The connecting arm and handle are fixed by screw A2 for easy disassembly. The connecting arm and jaw are fixed by screw C5. The left jaw 6 and right jaw 7 have trapezoidal grooves at their heads, with the smallest end slightly smaller than the U-shaped opening of a U-shaped nail. An R-shaped arc groove is provided in the middle of the groove for securing the orthopedic rod and providing a fixing function. The handle... Designed with an extended arm, based on the lever principle, the longer the arm, the less force is required. When the operator closes the handle, the slot of the pliers head engages with the U-shaped opening of the U-shaped nail. As the arm slowly closes, the slot expands the U-shaped opening of the U-shaped nail. The screw plug is fixed to the spinal U-shaped nail by M9×1 or M10×1 threads. When the U-shaped opening of the spinal U-shaped nail is expanded by about 0.5mm, the screw plug separates from the spinal U-shaped nail. At this time, the screw plug can be removed with a screw plug extractor. The U-shaped opening of the spinal nail is only expanded by about 0.5mm and is not damaged.

[0005] Furthermore, the handle is designed with a locking slot that fits into the connecting arm, and is fixed with screw A2. It is detachable. The left and right connecting arms are fixed with screw B4 and are not detachable. The connecting arms are connected to the claws with screw C5 and are not detachable.

[0006] Furthermore, the left jaw 6 has an arc groove in the middle, and a round hole in the middle of the arc groove. The right jaw 7 has an arc plate in the middle, and a round hole in the middle of the arc plate. The arc plate of the right jaw 7 is inserted into the arc groove of the left jaw 6 and fixed by a screw B4 passing through all the round holes.

[0007] This utility model has the following advantages:

[0008] No parts are damaged, thus avoiding the generation of metal fragments and improving the safety of the surgery.

[0009] It is simple and convenient to operate, and quick and easy to remove, saving surgical time.

[0010] It is rationally designed, compact in structure, and easy to carry and use. Attached Figure Description

[0011] Figure 1 This is an assembly diagram of the present invention.

[0012] Figure 2 This is an isometric view of the present invention.

[0013] Figure 3 This is a schematic diagram of the right claw 7 of this utility model.

[0014] Figure 4 This is a schematic diagram of the connecting arm of this utility model. Detailed Implementation

[0015] The operation of this utility model is described below with reference to the accompanying drawings:

[0016] I. Component Design: Left and Right Clamping Heads: The clamping head is the core working component of the extractor, with a trapezoidal slot designed at its top. The minimum dimension of the trapezoidal slot needs to be precisely calculated to ensure it is slightly smaller than the U-shaped opening of the U-shaped nail, allowing it to smoothly engage and open the U-shaped opening. An R-shaped arc groove is designed in the middle of the trapezoidal slot to hold the orthotic rod, increasing the stability of the fixation.

[0017] Left and right connecting arms: The connecting arms connect the pliers head and the handle, and serve to transmit force. They are fixed to the pliers head and handle with screws and movable chucks, ensuring a stable structure and easy disassembly and maintenance.

[0018] Left and right handles: The handles are designed with extended arms. Based on the lever principle, the extended arms reduce the force required for operation, making it easier to operate. The handle surface can be designed with a non-slip texture to improve grip comfort and operational stability.

[0019] II. Preparatory Steps: First, confirm that all parts of the screw extractor are intact and undamaged, and that the pliers head and slots are clean and free of foreign objects. Select the appropriate extractor model according to the specifications of the spinal screw.

[0020] Positioning and Insertion: Align the jaws of the extractor with the U-shaped opening of the spinal screw, and gently close the left and right handles to engage the trapezoidal groove of the jaws into the U-shaped opening. Keep your hands steady during operation to prevent the jaws from tilting. Opening the U-Shaped Opening: Continue to slowly close the left and right handles, using leverage to gradually open the U-shaped opening. The degree of opening needs to be determined based on the thread specifications of the plug and the spinal screw; typically, opening about 0.5mm is sufficient to separate the plug from the spinal screw.

[0021] Remove the screw plug: After the screw plug is separated from the spinal nail, use the tip of the screw plug extractor to remove the screw plug from the spinal nail.

Claims

1. A plug extractor, comprising a left chuck (6), a right chuck (7), a left connecting arm (3), a right connecting arm (8), a left handle (1), a right handle (9), and screws A (2), B (4), and C (5), characterized in that, The left jaw (6) and right jaw (7) are designed with trapezoidal grooves at their heads. The smallest end of the groove is slightly smaller than the U-shaped opening of the U-shaped nail. The middle of the groove is provided with an R-shaped arc groove, which is used to hold the orthotic rod and play a fixing role. The handle is designed with an extended arm. According to the lever principle, the longer the arm, the less force is required. When the operator closes the handle, the groove of the clamp head is inserted into the U-shaped opening of the U-shaped nail. As the arm is slowly closed, the groove expands the U-shaped opening of the U-shaped nail. The screw plug is fixed to the spinal U-shaped nail by M9×1 or M10×1 threads. When the U-shaped opening of the spinal U-shaped nail is expanded by about 0.5mm, the screw plug separates from the spinal U-shaped nail.

2. The screw plug extractor according to claim 1, characterized in that, The handle is designed with a locking shank that fits into the slot of the connecting arm. It is fixed with screw A (2) and is detachable. The left and right connecting arms are fixed with screw B (4) and are not detachable. The connecting arms are connected to the claws and fixed with screw C (5) and are not detachable.

3. A plug extractor according to claim 1, characterized in that, The left jaw (6) has an arc groove in the middle and a round hole in the middle of the arc groove. The right jaw (7) has an arc piece in the middle and a round hole in the middle of the arc piece. The arc piece of the right jaw (7) is inserted into the arc groove of the left jaw (6) and fixed by a screw B (4) passing through all the round holes.

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