A screw assisted retrieval device

Abstract

The utility model discloses a kind of screw auxiliary extraction devices, belong to orthopedics to take out the field of instrument. Including main rod, with stem, threaded drill bit;Movable sleeve, with movable through hole;Locking clamp jaw, with clamp jaw mouth;Locking clamp jaw is sleeved on stem, and threaded drill bit is set in clamp jaw mouth;Locking clamp jaw is set in movable through hole, and the outer wall of locking clamp jaw is provided with expansion face;Expansion face and the inner wall of movable through hole are in conformity;The outer wall of stem is provided with first outer thread, the inner wall of movable through hole is provided with first inner thread, and first outer thread is connected with first inner thread.In the screw is taken out, threaded drill bit can be drilled into the screw of fracture or silk by rotating main rod, and in the process of rotating main rod, movable sleeve can be forced to move downward, and then expansion face is compressed to center and close, so that the clamp jaw mouth of locking clamp jaw is gradually closed, screw is clamped and fixed, so that screw can be taken out easily and conveniently without damaging bone tissue.

Description

Technical Field

[0001] This utility model belongs to the field of orthopedic screw removal instrument technology, and specifically relates to a screw removal-assisted device. Background Technology

[0002] In orthopedic surgery, internal fixation with screws, plates, and cannulated screws is a common method. In particular, semi-threaded cancellous bone screws and semi-threaded cannulated screws are more widely used. Their advantages are that they conform to biomechanical principles, effectively compress the fracture ends, achieve a stable state after fracture fixation, and meet the intensity of rehabilitation training. Combined with early functional exercises, they can promote fracture healing.

[0003] While modern medical technology allows for quick and easy removal of bone screws, the possibility of screw breakage or slippage of the screw cap remains. In such cases, screw removal becomes more difficult. Current methods involve removing bone around the screw to loosen it before removal. This procedure increases trauma at the fracture site, significantly increasing the risk of secondary fractures. Furthermore, when a screw breaks, indiscriminate removal of bone or drilling can cause excessive bone loss, leading to intraoperative or postoperative fractures, resulting in iatrogenic injury and increasing the risk of infection and further fractures. Utility Model Content

[0004] To address the aforementioned problems, the purpose of this invention is to provide a screw removal device that can easily and conveniently loosen and remove stripped or broken screws, avoiding increased trauma to bone tissue during screw removal and aiding in the patient's recovery.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows:

[0006] This utility model provides a screw-assisted removal device, comprising:

[0007] The main rod has a rod body and a threaded drill bit connected to the lower end of the rod body;

[0008] The movable sleeve has a through hole running vertically through the top and bottom.

[0009] The locking jaws have an opening and closing jaw opening at the lower end;

[0010] The locking jaws are sleeved on the rod body, and the threaded drill bit is disposed inside the jaw opening;

[0011] The upper part of the locking claw is movably disposed within the movable through hole, and the outer wall of the locking claw is provided with an expansion surface that gradually expands to both sides, and the expansion surface is in contact with the inner wall of the movable through hole.

[0012] The outer wall of the rod is provided with a first external thread, the inner wall of the movable through hole is provided with a first internal thread, the movable sleeve is sleeved on the rod, and the first external thread and the first internal thread are threadedly connected.

[0013] Furthermore, the first external thread is a positive thread, and the thread on the threaded drill bit is a negative thread.

[0014] Furthermore, the locking jaw includes several jaw pieces, which are gathered together to form a through-hole. The upper ends of the jaw pieces are integrally formed, and the lower ends are open and closed to form the jaw opening. The rod is inserted into the through-hole.

[0015] Furthermore, the outer wall of the gripper piece is an arc-shaped surface that gradually expands outward, forming the expansion surface.

[0016] Furthermore, the inner wall of the gripper piece is provided with a retaining protrusion, and the outer wall of the rod is provided with a retaining groove that matches the retaining protrusion, and the retaining protrusion is retained in the retaining groove.

[0017] Furthermore, the screw removal device also includes a handle, and the main rod also includes a connecting part connected to the upper end of the rod body. The handle and the connecting part are detachably and fixedly connected.

[0018] Furthermore, a second external thread is provided on the outer wall of the connecting part, the second external thread being a reverse thread, and a second internal thread is provided at the lower end of the handle, the second external thread being threadedly connected to the second internal thread.

[0019] Furthermore, the outer wall of the rod has a boss that surrounds the entire rod, the first external thread is provided on the boss, the upper end of the boss is provided with a first step, and the lower end of the handle abuts against the first step.

[0020] Furthermore, the lower end of the boss is provided with a second step, and the upper end of the locking claw abuts against the second step.

[0021] Furthermore, a positioning hole is provided on the outer wall of the movable sleeve.

[0022] Furthermore, the positioning hole can be a triangular hole, a square hole, a hexagonal hole, etc., and can be held in place by a corresponding triangular wrench, square wrench, or hexagonal wrench, thereby ensuring that the movable sleeve does not rotate with the main rod, and thus enabling the movable sleeve to rotate threadedly relative to the main rod and move downwards, thereby locking the jaws of the locking jaws.

[0023] The beneficial effects of the present utility model are as follows: Compared with the prior art, when removing a screw, the threaded drill bit can be drilled into the broken or stripped screw by rotating the main rod. During the process of rotating the main rod, the movable sleeve can be forced to move downward, thereby pressing the expansion surface to approach the center, making the jaw openings of the locking jaws gradually close, clamping and fixing the screw. Thus, the screw can be easily and conveniently removed without damaging the bone tissue. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is the front view of the screw auxiliary removal device.

[0025] Figure 2 is the structural schematic diagram of the "one"-shaped handle.

[0026] Figure 3 is the structural schematic diagram of the "T"-shaped handle.

[0027] Figure 4 is the structural schematic diagram of the main rod.

[0028] Figure 5 is the structural schematic diagram of the movable sleeve.

[0029] Figure 6 is the structural schematic diagram of the locking jaws.

[0030] Figure 7 is the bottom view of the locking jaws.

[0031] In the figure: 1. Main rod; 11. Rod body; 12. Threaded drill bit; 13. First external thread; 14. Card slot; 15. Connection part; 16. Second external thread; 17. Boss; 18. First step; 19. Second step; 2. Movable sleeve; 21. Movable through hole; 22. First internal thread; 23. Positioning hole; 3. Locking jaws; 31. Expansion surface; 32. Jaw piece; 33. Accommodating hole; 34. Clamping protrusion; 4. Jaw opening; 5. Handle; 51. Second internal thread. SPECIFIC EMBODIMENTS

[0032] In order to make the objectives, technical solutions and advantages of the present utility model clearer and more understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0033] To achieve the above objectives, the technical solution of the present utility model is as follows:

[0034] See Figure 1-6 As shown, this embodiment provides a screw auxiliary removal device, including:

[0035] The main rod 1 has a rod body 11 and a threaded drill bit 12 connected to the lower end of the rod body 11;

[0036] The movable sleeve 2 has a through hole 21 extending vertically;

[0037] The locking jaw 3 has a jaw opening 4 at its lower end that can be opened and closed;

[0038] The locking jaw 3 is sleeved on the rod body 11, and the threaded drill bit 12 is set inside the jaw opening 4;

[0039] The upper part of the locking claw 3 is movably disposed in the movable through hole 21. The outer wall of the locking claw 3 is provided with an expansion surface 31 that gradually expands to both sides. The expansion surface 31 fits against the inner wall of the movable through hole 21.

[0040] The outer wall of the rod 11 is provided with a first external thread 13, the inner wall of the movable through hole 21 is provided with a first internal thread 22, the movable sleeve 2 is sleeved on the rod 11, and the first external thread 13 is threadedly connected to the first internal thread 22.

[0041] Among them, the first external thread 13 is a positive thread, and the thread on the thread drill bit 12 is a negative thread.

[0042] Furthermore, the locking jaw 3 includes several jaw pieces 32, which are gathered together to form a through-hole 33. The upper ends of the jaw pieces 32 are integrally formed, and the lower ends are opened to form jaw openings 4. The rod 11 is inserted into the through-hole 33. In use, the jaw openings 4 can be clamped on the end of the screw, so that the threaded drill bit 12 inside the jaw openings 4 can be aligned with the screw.

[0043] Furthermore, the outer wall of the gripper piece 32 is an arc-shaped surface that gradually expands outward, forming an expansion surface 31. As the movable sleeve 2 moves downward, it can gradually squeeze the arc-shaped surface inward, forcing the gripper piece 32 to close and tighten the gripper opening 4.

[0044] Furthermore, the inner wall of the gripper 32 is provided with a retaining protrusion 34, and the outer wall of the rod 11 is provided with a groove 14 that matches the retaining protrusion 34. The retaining protrusion 34 is engaged in the groove 14 to form a retaining structure, which can ensure that the locking gripper 3 and the main rod 1 are relatively fixed, and prevent the locking gripper 3 from coming off the main rod 1.

[0045] Furthermore, the screw removal device also includes a handle 5, and the main rod 1 also includes a connecting part 15. The connecting part 15 is connected to the upper end of the rod body 11. A second external thread 16 is provided on the outer wall of the connecting part 15. The second external thread 16 is a reverse thread. A second internal thread 51 is provided at the lower end of the handle 5. The second external thread 16 and the second internal thread 51 are threadedly connected. The threaded connection structure facilitates the disassembly of the handle 5 and the main rod 1, thereby facilitating the installation of the movable sleeve 2.

[0046] Specifically, the handle 5 can be in the shape of a straight line that takes up less space, or in the shape of a T that requires less effort.

[0047] Furthermore, the outer wall of the rod body 11 has a boss 17 surrounding the entire rod body 11, a first external thread 13 is provided on the boss 17, the upper end of the boss 17 is provided with a first step 18, and the lower end of the handle 5 abuts against the first step 18. The lower end of the boss 17 is provided with a second step 19, and the upper end of the locking claw 3 abuts against the second step 19.

[0048] Furthermore, the outer wall of the movable sleeve 2 is provided with a positioning hole 23. The positioning hole 23 can be a triangular hole, a square hole, a hexagonal hole, etc., and can be held by a corresponding triangular wrench, a square wrench, or a hexagonal wrench, so as to ensure that the movable sleeve 2 does not rotate with the main rod 1 in the horizontal direction. When the main rod 1 rotates, the movable sleeve 2 can only move downward relative to the main rod 1 in a threaded motion, so as to tighten the jaw opening 4 of the locking jaw 3.

[0049] Since the screws used in orthopedics typically have positive threads and are made of titanium, which has relatively low hardness, when using this device to remove the screw, the screw is placed in the jaw opening 4 of the locking jaw 3, the thread drill bit 12 is aligned with the screw, and the handle 5 is turned counterclockwise. Because the second external thread 16 is a reverse thread, the handle 5 is relatively locked to the main rod 1, which can only drive the main rod 1 to rotate, thus drilling the thread drill bit 12 into the broken or stripped screw. During the rotation of the main rod 1, the movable sleeve 2 is engaged in the positioning hole 23 by the external positioning element, ensuring that the movable sleeve 2 does not move horizontally. As the main rod 1 rotates together, since the first external thread 13 is a reverse thread screw, the movable sleeve 2 can only move downward based on the threaded connection. The inner wall of the movable sleeve 2 presses the expansion surface 31 downward, thereby pressing the expansion surface 31 towards the center, so that the jaw opening 4 of the locking jaw 3 gradually closes, clamping and fixing the screw. When the threaded drill bit 12 drills to a certain depth, the threaded drill bit 12 and the screw will be fixed. At this time, it is necessary to turn the handle 5 counterclockwise to drive the screw to rotate counterclockwise, loosen the screw, and remove the screw easily and conveniently without damaging the bone tissue.

[0050] During the removal of the screw, the locking jaws 3 can clamp and fix the screw, ensuring good contact and fixation between the thread drill bit 12 and the screw, so that the thread drill bit 12 can smoothly drill into the screw and bring the screw out.

[0051] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A screw-assisted extraction device, characterized in that, include: The main rod has a rod body and a threaded drill bit connected to the lower end of the rod body; The movable sleeve has a through hole running vertically through the top and bottom. The locking jaws have an opening and closing jaw opening at the lower end; The locking jaws are sleeved on the rod body, and the threaded drill bit is disposed inside the jaw opening; The upper part of the locking claw is movably disposed in the movable through hole, and the outer wall of the locking claw is provided with an expansion surface that gradually expands to both sides, and the expansion surface is in contact with the inner wall of the movable through hole; The outer wall of the rod is provided with a first external thread, the inner wall of the movable through hole is provided with a first internal thread, the movable sleeve is sleeved on the rod, and the first external thread and the first internal thread are threadedly connected.

2. A screw-assisted retrieval device as defined in claim 1, wherein, The first external thread is a positive thread, and the thread on the threaded drill bit is a negative thread.

3. A screw-assisted retrieval device as defined in claim 1, wherein, The locking jaw includes several jaw pieces, which are gathered together to form a through-hole. The upper ends of the jaw pieces are integrally formed, and the lower ends are open and closed to form the jaw opening. The rod is inserted into the through-hole.

4. A screw-assisted retrieval device as defined in claim 3, wherein, The outer wall of the gripper piece is an arc-shaped surface that gradually expands outward, forming the expansion surface.

5. A screw-assisted retrieval device as defined in claim 3, wherein, The inner wall of the gripper piece is provided with a retaining protrusion, and the outer wall of the rod is provided with a slot that matches the retaining protrusion, and the retaining protrusion is engaged in the slot.

6. A screw-assisted retrieval device as defined in claim 1, wherein, The screw removal device also includes a handle, and the main rod also includes a connecting part connected to the upper end of the rod body. The handle and the connecting part are detachably and fixedly connected.

7. A screw-assisted retrieval device as defined in claim 6, wherein, The outer wall of the connecting part is provided with a second external thread, which is a reverse thread, and the lower end of the handle is provided with a second internal thread. The second external thread and the second internal thread are threadedly connected.

8. A screw-assisted retrieval device as defined in claim 6, wherein, The outer wall of the rod has a boss that surrounds the entire rod. The first external thread is provided on the boss. The upper end of the boss is provided with a first step. The lower end of the handle abuts against the first step.

9. A screw-assisted extraction device as defined in claim 8, wherein, The lower end of the boss is provided with a second step, and the upper end of the locking claw abuts against the second step.

10. A screw-assisted retrieval device as defined in claim 1, wherein, The movable sleeve has a positioning hole on its outer wall.

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