Ligament cutting forceps for carpal tunnel syndrome surgery

Abstract

This utility model provides a ligament cutting forceps for use in the field of medical devices, specifically for carpal tunnel syndrome surgery. It includes a handle and a shaft. The shaft has a fixed clamp fixed to it via an adjusting seat. The adjusting seat has an arc-shaped groove. The movable clamp, via a clamp slider, forms a rotation adjustment mechanism with the adjusting seat. A guide rod connects the clamp slider to a traction block. The traction block, driven by the traction force of the movable handle, adjusts the movable clamp to move towards the fixed clamp end for ligament clamping and fixation. When the movable clamp closes, the cutting grooves within the upper and lower clamps form a cutting path. An arc-shaped cutting edge slides within the cutting groove. The arc-shaped cutting edge is connected to a cutting handle on one side of the fixed handle via a guide rod. Pulling the cutting handle causes the arc-shaped cutting edge to slide within the cutting groove to complete the cut. After cutting, pushing the cutting handle resets the clamp. The cutting forceps are easy to operate, achieving stable fixation and precise cutting, improving surgical efficiency and reducing complications.

Description

Technical Field

[0001] This utility model relates to the field of medical devices, and in particular to a ligament cutting forceps used in carpal tunnel syndrome surgery. Background Technology

[0002] Carpal tunnel syndrome is a peripheral nerve entrapment syndrome caused by compression of the median nerve within the carpal tunnel. Carpal tunnel ligament cutting forceps can relieve symptoms such as numbness, pain, and weakness in the hand by cutting part or all of the carpal tunnel ligaments (mainly the transverse carpal ligament).

[0003] In current carpal tunnel syndrome excision surgeries, surgical forceps are mostly used to clamp and fix the transverse carpal ligament, and then the forceps blade is used for cutting. The forceps used now are not precise enough or are not convenient to operate, which leads to excessively long operation time or risks. They may cause unnecessary damage to surrounding tissues during cutting, such as surrounding blood vessels, nerves or cartilage, increasing the risk of postoperative complications. In addition, the blade usually cannot make an efficient cut in one go, prolonging the operation time. Utility Model Content

[0004] The purpose of this invention is to provide a ligament cutting forceps for carpal tunnel syndrome surgery compared to existing technologies, which improves the efficiency of ligament cutting, achieves more precise cutting and less trauma, avoids repetitive operations, and adopts a more ergonomic and refined design, making fixation and cutting operations simple and convenient, improving work efficiency and reducing complications caused by fixation and cutting in patients.

[0005] The ligament cutting forceps of this utility model include a fixed handle, a shaft fixedly connected to the upper end of the fixed handle, an adjusting seat fixedly connected to the inner wall of the shaft end away from the fixed handle, a fixed chuck fixedly connected to one end of the adjusting seat, a fixed block fixedly connected to the top of the adjusting seat, an adjusting plate rotatably connected to the upper end of the fixed block, a movable chuck fixedly connected to one end of the adjusting plate, a chuck slider rotatably connected to the other end of the adjusting plate, the chuck slider sliding in an arc-shaped groove, a chuck guide rod fixedly installed on the chuck slider, a connecting block fixedly connected to the other end of the chuck guide rod, a traction block rotatably connected to the connecting block, the traction block having a "V" shaped structure, the upper end of the traction block hinged to the fixed handle, and the lower end of the traction block fixedly connected to the movable handle, the movable handle being hinged to the fixed handle;

[0006] A locking bolt is threaded onto one side of the fixed handle. A blade guide rod is slidably connected inside the locking bolt. The end of the blade guide rod near the fixed handle is fixedly connected to the cutting handle. A blade groove is provided inside the fixed chuck and the movable chuck. An arc-shaped blade is slidably connected to the blade groove. A blade handle is fixedly connected to one end of the arc-shaped blade. The blade guide rod is fixedly connected to the end of the blade handle away from the arc-shaped blade.

[0007] Furthermore, a limiting plate is provided inside the shaft, and the limiting plate has a limiting hole. The chuck guide rod slides in the limiting hole, and the cutting edge guide rod slides in the limiting hole.

[0008] Furthermore, the lower ends of the fixed handle and the movable handle are provided with a serrated locking mechanism that meshes with each other.

[0009] Furthermore, the length of the blade guide rod pulled out of the fixed handle is greater than the length of the blade groove.

[0010] Furthermore, the width and depth of the cutting groove are slightly greater than the thickness and height of the shank.

[0011] Preferably, both the movable chuck guide rod and the blade guide rod are made of titanium alloy.

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

[0013] (1) This utility model adopts a linkage structure design. The position and angle of the movable clamp are adjusted by the clamp guide rod inside the shaft to clamp and fix the cut ligament. After the fixation is completed, the locking mechanism at the handle locks it. The linkage structure is simple, responds quickly, clamps stably, shortens the operation time, and improves work efficiency.

[0014] (2) Using the traction force of the handle at the end, the arc-shaped blade is driven by the internal blade guide rod of the shaft to cut in a closed and safe path. The "V" shape design of the arc-shaped blade is sharper, and while cutting efficiently, it prevents piercing deep tissues and avoids repeated cutting. After the arc-shaped blade has finished cutting, the blade guide rod can be pushed to reset, or the blade guide rod can be pushed to make the arc-shaped blade come out of the blade groove for cleaning and replacement.

[0015] (3) The round contact surfaces of the movable chuck and the fixed chuck reduce damage to the surrounding nerves and blood vessels, and reduce complications caused by clamping and fixing. The width and depth of the blade groove are slightly greater than the thickness and height of the blade handle, which facilitates blood flow during the cutting process.

[0016] (4) Both the chuck guide rod and the blade guide rod are made of titanium alloy material, which has strong tensile strength and takes into account both load-bearing capacity and the lightness of the implant. A limit plate is set inside the shaft. The limit hole on the limit plate can effectively reduce the tension generated by the chuck guide rod and the blade guide rod during transmission and improve stability. Attached Figure Description

[0017] Figure 1 This is a front perspective view of the present utility model;

[0018] Figure 2 This is a side perspective view of the present invention;

[0019] Figure 3 This is a closed view of the clamp structure of this utility model;

[0020] Figure 4 This is a diagram showing the unfolded structure of the clamp of this utility model;

[0021] Figure 5 This is a schematic diagram of the clamping and fixing operation according to an embodiment of the present utility model;

[0022] Figure 6 This is a schematic diagram illustrating the cutting process according to an embodiment of the present invention;

[0023] Figure 7 This is a schematic diagram of the clamping and cutting control adjustment according to an embodiment of the present invention;

[0024] Figure 8 This utility model Figure 7 Enlarged view of the structure at point A in the middle;

[0025] Figure 9 This is a cross-sectional schematic diagram of the limiting mechanism of this utility model.

[0026] Explanation of the labels in the diagram:

[0027] 1-Fixed handle, 2-Modible handle, 3-Traction block, 4-Connecting block, 5-Shaft, 6-Chuck guide rod, 7-Chuck slider, 8-Arc-shaped groove, 9-Adjusting seat, 10-Fixed block, 11-Adjusting disc, 12-Modible chuck, 13-Fixed chuck, 14-Arc-shaped blade, 15-Blade handle, 16-Blade groove, 17-Blade guide rod, 18-Locking bolt, 19-Cutting handle, 20-Locking mechanism, 21-Limiting disc, 2101-Limiting hole. Detailed Implementation

[0028] The embodiments will be clearly and completely described with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0029] Example 1

[0030] This invention provides a ligament cutting forceps for use in carpal tunnel syndrome surgery. Please refer to [link / reference]. Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 7 and Figure 8 It includes a fixed handle 1 and a movable handle 2. The upper end of the fixed handle 1 is fixedly connected to a shaft 5. The inner wall of the other end of the shaft 5 is fixedly connected to an adjusting seat 9. One end of the adjusting seat 9 is fixedly connected to a fixed chuck 13. The adjusting seat 9 has an arc-shaped slide groove 8. The chuck slider 7 slides in the arc-shaped slide groove 8. The adjusting plate 11 has an "L" shaped structure. The two ends of the adjusting plate 11 that are far apart from each other are fixedly connected to the movable chuck 12 and the chuck slider 7. The corner is rotatably connected to the fixed block 10 to form a fixed-point rotation structure. The chuck slider 7 is fixedly connected to a chuck guide rod 6. The other end of the chuck guide rod 6 is fixed to the connecting block 4. The connecting block 4 is rotatably connected to a traction block 3. The traction block 3 has a "V" shaped structure. One end is rotatably connected to the fixed handle 1 and the other end is fixedly connected to the movable handle 2 to form a multi-link displacement structure. A gear meshing locking mechanism 20 is provided below the fixed handle and the movable handle.

[0031] When using this ligament cutting forceps, with the hinge point of the movable handle 2 and the fixed handle 1 as the origin, the movable handle 2 moves to a fixed point on one side of the fixed handle 1, and the traction block 3 moves to a fixed point on the right side accordingly. Through the connecting block 4, the clamp guide rod 6 moves to the right, and the clamp guide rod 6 pulls the clamp slider 7 to slide to the right side of the arc-shaped slide groove 8, so that the adjusting plate 11 rotates counterclockwise around the corner as the center, driving the movable clamp 12 to move to the side of the fixed clamp 13. When it comes into contact with the target object, it generates resistance and completes the clamping and fixing. At this time, the movable handle and the fixed handle are engaged by the gear structure on the locking mechanism 20 to complete the clamping and locking. The linkage structure design is simple to operate, can quickly position and stably clamp both ends of the ligament, and shorten the operation time. After the movable clamp 12 is closed, it forms a spherical structure with the fixed clamp 13. The round head contact surface reduces damage to the surrounding nerves and blood vessels.

[0032] Please see Figure 1 , Figure 6 , Figure 7 and Figure 8 A locking bolt 18 is provided on one side of the fixed handle 1. One end of the locking bolt 18 is slidably connected to a cutting guide rod 17. One end of the cutting guide rod 17 is fixedly connected to a cutting handle 19. A cutting groove 16 is provided in the fixed chuck 13 and the movable chuck 12. The arc-shaped cutting blade 14 slides in the cutting groove 16 by the traction force of the cutting guide rod 17.

[0033] During the use of the cutting pliers, the movable chuck 12 closes to secure the pliers. The internal cutting grooves 16 of the movable chuck 12 and the fixed chuck 13 form a cutting path. Pulling the cutting handle 19 causes the cutting handle 19 to move the blade guide rod 17 synchronously, thereby pulling the arc-shaped blade 14 to cut within the cutting groove 16. After cutting, pushing the cutting handle 19 causes the blade guide rod 17 to apply a pushing force to guide the arc-shaped blade 14 back to its original position. The cutting handle 19 is located at one end of the fixed handle 1, conforming to ergonomic principles, and uses a "V"-shaped blade. The blade is sharp enough to efficiently sever ligaments, and the closed blade groove 16 forms a safe cutting path to prevent piercing deep tissues. In addition, the length of the blade guide rod 17 pulled out of the fixed handle 1 should be greater than the length of the blade groove 16 so that the curved blade 14 can slide the maximum distance within the blade groove 16 to achieve complete cutting. Pushing the cutting handle 19 can disengage the curved blade 14 from the blade groove 16, making it easy to clean and replace the curved blade 14. Furthermore, the width and depth of the blade groove 16 are greater than the thickness and height of the handle 15, which facilitates blood drainage during the cutting process.

[0034] Please see Figure 7 and Figure 9 In this design, the chuck guide rod 6 and the cutting edge guide rod 17 are driven inside the shaft 5. At the same time, a limiting plate 21 is provided inside the shaft 5, and a limiting hole 2101 is opened on the limiting plate 21. The chuck guide rod 6 and the cutting edge guide rod 17 pass through the limiting hole 2101 and slide in the hole, which can effectively reduce the tension generated during the transmission of the chuck guide rod 6 and the cutting edge guide rod 17 and improve the stability of fixing and cutting.

[0035] In this invention, both the clamp guide rod 6 and the blade guide rod 17 are made of titanium alloy. The blade guide rod 17, made of titanium alloy wire, has strong tensile strength and takes into account both load-bearing capacity and the lightness of the implant. At the same time, titanium alloy has high stability and biocompatibility during clinical surgery and will not cause rejection.

[0036] The above description is only the best implementation method adopted by this utility model in combination with current actual needs, but the protection scope of this utility model is not limited thereto.

Claims

1. A ligament cutting forceps applied to carpal tunnel syndrome surgery, comprising a fixed handle (1), characterized in that, A shaft (5) is fixedly connected to the upper end of the fixed handle (1). An adjusting seat (9) is fixedly connected to the inner wall of the end of the shaft (5) away from the fixed handle (1). A fixing clamp (13) is fixedly connected to one end of the adjusting seat (9). A fixing block (10) is fixedly connected to the top of the adjusting seat (9). An adjusting disc (11) is rotatably connected to the upper end of the fixing block (10). A movable clamp (12) is fixedly connected to one end of the adjusting disc (11). A clamp is rotatably connected to the other end of the adjusting disc (11). The head slider (7) slides in the arc-shaped groove (8). A chuck guide rod (6) is fixedly installed on the chuck slider (7). A connecting block (4) is fixed at the other end of the chuck guide rod (6). A traction block (3) is rotatably connected to the connecting block (4). The traction block (3) has a "V" shaped structure. The upper end of the traction block (3) is hinged to the fixed handle (1). A movable handle (2) is fixedly connected to the lower end of the traction block (3). The movable handle (2) is hinged to the fixed handle (1). A locking bolt (18) is threadedly connected to one side of the fixed handle (1). A cutting guide rod (17) is slidably connected inside the locking bolt (18). A cutting handle (19) is fixedly connected to one end of the cutting guide rod (17) near the fixed handle (1). A cutting groove (16) is provided inside the fixed chuck (13) and the movable chuck (12). An arc-shaped cutting edge (14) is slidably connected to the cutting groove (16). A cutting handle (15) is fixedly connected to one end of the arc-shaped cutting edge (14). The cutting guide rod (17) is fixedly connected to the end of the cutting handle (15) away from the arc-shaped cutting edge (14).

2. The ligament cutting forceps for carpal tunnel syndrome surgery according to claim 1, characterized in that, A limiting plate (21) is provided inside the shaft (5), and a limiting hole (2101) is opened in the limiting plate (2101). The chuck guide rod (6) slides in the limiting hole (2101), and the cutting edge guide rod (17) slides in the limiting hole (2101).

3. The ligament cutting forceps for use in carpal tunnel syndrome surgery according to claim 1, characterized by The lower ends of the fixed handle (1) and the movable handle (2) are provided with a toothed locking mechanism (20) that meshes with each other.

4. The ligament cutting forceps for use in carpal tunnel syndrome surgery according to claim 1, wherein The length of the blade guide rod (17) pulled out of the fixed handle (1) is greater than the length of the blade groove (16).

5. The ligament cutting forceps for carpal tunnel syndrome surgery according to claim 1, characterized in that, Both the chuck guide rod (6) and the blade guide rod (17) are made of titanium alloy.

6. The ligament cutting forceps for use in carpal tunnel syndrome surgery according to claim 1, wherein The width of the groove (16) is greater than the thickness of the handle (15), and the depth of the groove (16) is greater than the height of the handle (15).

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