Ankle fusion plate, fusion plate assembly, and ankle internal fixation system

Abstract

The present application provides a kind of ankle fusion plate, fusion plate assembly and ankle internal fixation system, comprising: ankle fusion plate, including sequentially connected from top to bottom upper plate, cross joint plate and lower plate;The lower part of upper plate is protruding forward, and cross joint plate is recessed backward;Upper plate is provided with four upper plate fixing holes and a cortical nail mounting hole;Lower plate is provided with three lower plate fixing holes.Ankle fusion plate assembly of the present application makes the upper plate and the bone surface of tibia fit well;Ankle fusion plate assembly is beneficial to reduce the surgical trauma incision, reduce the amount of bleeding during operation, more safe and effective, facilitate the operation of doctor, reduce the surgical burden of patient.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a foot and ankle fusion plate, a fusion plate assembly, and a foot and ankle internal fixation system. Background Technology

[0002] For the treatment of end-stage ankle joint disease, ankle arthroplasty has developed into various fusion techniques, including external fixation, arthroscopic fusion, and internal fixation using screws and plates. Among these, internal fixation using screws and plates has shown certain advantages. However, internal fixation still has a certain failure rate. Currently available ankle fusion plate components generally suffer from poor adhesion to the bone surface, long incisions, and significant trauma, making them inconvenient for surgeons. Summary of the Invention

[0003] In view of the shortcomings of the prior art described above, the technical problem solved by the present invention is to provide a foot and ankle fusion plate, a fusion plate assembly, and a foot and ankle internal fixation system that have good bone surface fit, short incision and minimal trauma.

[0004] To achieve the above and other related objectives, the present invention provides a foot-ankle fusion plate, comprising an upper plate, a cross-joint plate, and a lower plate connected sequentially from top to bottom; the lower part of the upper plate protrudes forward to form a lower convex portion; the cross-joint plate is recessed backward; the upper plate has four upper plate fixing holes and one cortical pin mounting hole, wherein two of the upper plate fixing holes are above the cortical pin mounting hole and the other two are below the cortical pin mounting hole; the lower plate has three lower plate fixing holes; one of the lower plate fixing holes is below the other two lower plate fixing holes.

[0005] Preferably, the thickness of the cross-joint plate is as follows: from the middle of the cross-joint plate towards the upper end of the cross-joint plate, the thickness of the cross-joint plate decreases sequentially; from the middle of the cross-joint plate towards the lower end of the cross-joint plate, the thickness of the cross-joint plate decreases sequentially; the thickness of the upper end of the cross-joint plate is greater than the thickness of the upper plate, and the thickness of the lower end of the cross-joint plate is greater than the thickness of the lower plate.

[0006] Preferably, the four upper plate fixing holes are arranged in a rectangular array.

[0007] Preferably, the corrugated pin mounting hole is an elongated hole; the distance between the central axis of the corrugated pin mounting hole and the central axis of the four upper plate fixing holes is equal.

[0008] The fusion plate assembly of the present invention includes: the foot-ankle fusion plate, at least two upper plate fixing screws, cortical screws, and three lower plate fixing screws;

[0009] The upper plate fixing screws are used to install on the upper plate fixing holes;

[0010] The leather screw is used to be installed in the leather nail mounting hole;

[0011] The lower plate fixing screw is used to install on the lower plate fixing hole.

[0012] As described above, the ankle fusion plate and fusion plate assembly of the present invention have the following beneficial effects:

[0013] When using the ankle fusion plate assembly of the present invention, the upper plate is fixed to the anterior side of the tibia by upper plate fixing screws and cortical screws, and the lower plate is installed on the anterior side of the talus by lower plate fixing screws. Since the lower part of the anterior side of the tibia is a forward-protruding structure, the lower part of the upper plate protrudes forward, forming a lower convex part, which makes the upper plate fit well with the bone surface of the tibia. The lower part of the upper plate protrudes forward, and the cross-joint plate is concave backward, so that part of the ankle fusion plate is a bent structure. The length and volume of the bent ankle fusion plate are reduced, which helps to reduce the surgical incision, reduce the amount of bleeding during the operation, and make it safer and more effective. It also facilitates the operation of doctors and reduces the surgical burden on patients.

[0014] Since two of the upper plate fixing holes are located above the cortical screw mounting holes, and the other two upper plate fixing holes are located below the cortical screw mounting holes, the screw hole positions of the four upper plate fixing holes can provide doctors with more screw implantation path options, facilitating surgical operations.

[0015] The present invention also relates to a foot and ankle internal fixation system, comprising: a fixation bracket, a tension screw, and the aforementioned foot and ankle fusion plate assembly;

[0016] The fixed bracket includes a fixed plate, a front positioning cylinder, an arc-shaped connecting rod, an outer positioning cylinder, and an outer receiving cylinder. The two ends of the arc-shaped connecting rod are respectively connected to the front positioning cylinder and the outer positioning cylinder. The end of the front positioning cylinder is connected to the fixed plate. The fixed plate is provided with a plate through hole, and the upper plate fixing screw can pass through the plate through hole and the upper plate fixing hole in sequence. The outer receiving cylinder is provided with the outer receiving cylinder. The lower end of the outer receiving cylinder is provided with teeth, and the outer receiving cylinder is for the insertion of the tension screw.

[0017] As described above, the foot and ankle internal fixation system of the present invention has the following beneficial effects:

[0018] When using the foot and ankle internal fixation system of the present invention, the lower plate is installed on the anterior side of the talus, and the upper plate fixing screw passes through the through hole and the upper plate fixing hole in sequence and enters the tibia. After the fixation plate is connected to the upper plate, the upper plate fixing screw fixes the upper plate to the tibia. The lateral receiving sleeve is set on the lateral side of the tibia, and the teeth of the lateral receiving sleeve make the lateral receiving sleeve stably set on the tibia. Since the traction screw is placed in the lateral receiving sleeve, the traction screw enters from the lateral side of the tibia. The traction screw is not connected to the foot and ankle fusion plate, which makes it easy to adjust the implantation angle of the traction screw to the optimal angle, so that the traction screw can enter the tibia and talus in sequence. Attached Figure Description

[0019] Figure 1 The diagram shows the anterior structure of the foot and ankle internal fixation system connected to the tibia and the talus in this embodiment.

[0020] Figure 2 The diagram shows the medial structure of the foot and ankle internal fixation system connected to the tibia and the talus in this embodiment.

[0021] Figure 3 The diagram shows the lateral structure when the internal fixation system of the foot and ankle in this embodiment is connected to the tibia and when the internal fixation system of the foot and ankle is connected to the talus.

[0022] Figure 4 The diagram shown is a three-dimensional structural schematic of the foot and ankle internal fixation system of this embodiment.

[0023] Figure 5 The diagram shows a three-dimensional structural schematic of the foot-ankle fusion plate of the foot-ankle internal fixation system of this embodiment.

[0024] Figure 6 The diagram shows the inner structure of the foot-ankle fusion plate of the foot-ankle internal fixation system in this embodiment.

[0025] Figure 7 The diagram shows the front structure of the foot-ankle fusion plate of the foot-ankle internal fixation system in this embodiment.

[0026] Figure 8 The diagram shows the rear structure of the fixation bracket of the foot and ankle internal fixation system in this embodiment.

[0027] Figure 9 The diagram shown is a top view of the fixation bracket of the foot and ankle internal fixation system in this embodiment.

[0028] Figure 10 The diagram shows a three-dimensional structural schematic of the fixation bracket of the foot and ankle internal fixation system in this embodiment.

[0029] Figure 11The diagram shows the posterior structure of the foot-ankle fusion plate of the foot-ankle internal fixation system in this embodiment.

[0030] Figure 12 The diagram shown is a cross-sectional view of the foot-ankle fusion plate of the foot-ankle internal fixation system of this embodiment.

[0031] Explanation of icon numbers

[0032] 10 Tibia

[0033] 20 talus

[0034] 100 Foot-Ankle Fusion Plate

[0035] 110 upper plate parts

[0036] 111 Upper plate fixing hole

[0037] 112 Leather staple mounting holes

[0038] 113 Groove

[0039] 114 Lower bulge

[0040] 115 Kirschner wire holes

[0041] 116 The lower end of the upper plate

[0042] M1 First Reference Plane

[0043] M2 Second Reference Plane

[0044] 120 cross-joint plate

[0045] 130 Lower Plate

[0046] 131 Lower plate fixing holes

[0047] 132 Bottom surface of the lower plate

[0048] 210 Top plate fixing screws

[0049] 230 Lower plate fixing screws

[0050] 300 Fixed bracket

[0051] 310 Fixing Plate

[0052] 311 Through holes in sheet metal

[0053] 312 Protrusion

[0054] 320 Front Positioning Cylinder

[0055] 330 Arc-shaped connecting rod

[0056] 340 Outer Positioning Cylinder

[0057] 350 outer receiving cylinder

[0058] 351 teeth

[0059] 400 tension screw

[0060] Angle between the bottom surface of the lower plate and the second reference plane of the ankle fusion plate.

[0061] B. Distance between the lower end of the upper plate and the bottom end of the lower plate.

[0062] L1 Central axis of Kirschner wire hole

[0063] L2 rear baseline

[0064] T refers to the thickness of the middle section of the joint plate. Detailed Implementation

[0065] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0066] Please refer to the accompanying drawings. It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and are not intended to limit the scope of the invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the disclosed technical content. Furthermore, the terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and are not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention.

[0067] like Figures 1 to 12 As shown, the ankle fusion plate 100 of this embodiment includes an upper plate 110, a cross-joint plate 120, and a lower plate 130 connected sequentially from top to bottom; the lower part of the upper plate 110 protrudes forward to form a lower protrusion 114; the cross-joint plate 120 is recessed backward; the upper plate 110 is provided with four upper plate fixing holes 111 and one cortical nail mounting hole 112, wherein two upper plate fixing holes 111 are above the cortical nail mounting hole 112, and the other two upper plate fixing holes 111 are below the cortical nail mounting hole 112; the lower plate 130 is provided with three lower plate fixing holes 131; one lower plate fixing hole 131 is below the other two lower plate fixing holes 131.

[0068] The fusion plate assembly of this embodiment includes: the foot and ankle fusion plate 100, at least two upper plate fixing screws 210, a cortical screw, and three lower plate fixing screws 230;

[0069] The upper plate fixing screw 210 is used to be installed on the upper plate fixing hole 111;

[0070] Leather screws are used for mounting on leather nail mounting holes 112;

[0071] The lower plate fixing screw 230 is used to install on the lower plate fixing hole 131.

[0072] When the ankle fusion plate of the present invention is used, the upper plate 110 is fixed to the anterior side of the tibia 10 by upper plate fixing screws 210 and cortical screws, and the lower plate 130 is installed on the anterior side of the talus 20 by lower plate fixing screws 230. Since the lower part of the anterior side of the tibia 10 is a forward-protruding structure, the lower part of the upper plate 110 protrudes forward, forming a lower convex part 114; this ensures good contact between the lower convex part 114 of the upper plate 110 and the bone surface of the lower part of the anterior side of the tibia 10; the lower part of the upper plate 110... The forward-protruding joint plate 120 and the posteriorly concave joint plate 120 result in a bent structure in part of the foot-ankle fusion plate 100. This reduces the length and volume of the bent foot-ankle fusion plate 100, which helps to reduce surgical incisions, decrease bleeding during surgery, and make the procedure safer and more effective. It also facilitates surgical operations for doctors and reduces the surgical burden on patients. Because the posteriorly concave joint plate 120 is designed to fit the anterior structures of the tibia 10 and the talus 20, the foot-ankle fusion plate 100 can be adapted to these structures.

[0073] Because two of the upper plate fixation holes 111 are located above the cortical screw mounting holes 112, and the other two upper plate fixation holes 111 are located below the cortical screw mounting holes 112, the screw hole positions of the four upper plate fixation holes 111 provide the surgeon with more screw implantation path options, facilitating surgical operations. One lower plate fixation hole 131 is located below the other two lower plate fixation holes 131, allowing the lower plate 130 to be stably connected to the talus 20.

[0074] The thickness of the joint plate 120 is as follows: from the middle of the joint plate 120 towards the upper end, the thickness of the joint plate 120 decreases sequentially; from the middle of the joint plate 120 towards the lower end, the thickness of the joint plate 120 decreases sequentially; the thickness of the upper end of the joint plate 120 is greater than the thickness of the upper plate 110, and the thickness of the lower end of the joint plate 120 is greater than the thickness of the lower plate 130. This results in the joint plate 120 having a larger thickness in the middle, and the thickness of the joint plate 120 always being greater than the thickness of the upper plate 110 and the thickness of the joint plate 120 always being greater than the thickness of the lower plate 130. This makes the joint plate 120 in a bent state have good structural strength and is not easy to break.

[0075] The thickness T of the middle part of the joint plate 120 ranges from 4.8 to 4.9 mm; in this embodiment, the thickness of the middle part of the joint plate 120 is 4.8 mm.

[0076] The four upper plate fixing holes 111 are arranged in a rectangular array, forming two rows of upper plate fixing holes 111 on the upper plate 110 along the horizontal direction. Doctors can select the upper plate fixing holes 111 to use according to the patient's actual situation, which facilitates the doctor's surgical operation. The width of the foot and ankle fusion plate 100 is sufficient to allow the four upper plate fixing holes 111 to form a rectangular array.

[0077] The thickness of the cross-joint plate 120 and the width of the foot-ankle fusion plate 100 ensure that the foot-ankle fusion plate 100 has sufficient mechanical strength, which increases the stability of the foot-ankle fusion plate 100 implantation and achieves better fusion results.

[0078] The cortical pin mounting hole 112 is an elongated hole; the distance between the central axis of the cortical pin mounting hole 112 and the central axis of the four upper plate fixing holes 111 is equal. This structure makes the upper plate 110 compact and ensures the stability of the ankle fusion plate 100 after installation.

[0079] The front side of the foot and ankle fusion plate 100 is provided with Kirschner wire holes 115. Kirschner wire holes 115 are through holes and are used for fixing Kirschner wires. Kirschner wires can be used for temporary fixation of bone blocks and serve as guides for subsequent drilling and screw insertion.

[0080] The central axis L1 of the Kirschner wire hole 115 is perpendicular to the vertical direction of the ankle fusion plate 100. A plane passing through the central axis L1 of the Kirschner wire hole 115 and vertically oriented is the first reference plane M1. The line connecting two points located at the rear end of the Kirschner wire hole 115 and on the first reference plane M1 is the rear reference line L2. A vertical plane passing through the rear reference line L2 and perpendicular to the central axis L1 of the Kirschner wire hole 115 is the second reference plane M2. The bottom surface 13 of the lower plate... The angle A between the upper plate 110 and the second reference plane M2 of the ankle fusion plate 100 ranges from 114° to 118°; the distance B between the lower end 116 of the upper plate and the bottom end of the lower plate 130 ranges from 19 to 20 mm. This range allows the lower convex portion 114 of the upper plate 110 to be closer to the bottom end of the lower plate 130, thus enabling the lower convex portion 114 of the upper plate 110 to better conform to the forward-protruding structure of the lower part of the tibia 10. In this embodiment, the angle A between the bottom surface of the lower plate 130 and the second reference plane M2 of the ankle fusion plate 100 is 116°; the distance B between the lower end 116 of the upper plate and the bottom end of the lower plate 130 is 19.5 mm.

[0081] The present invention also relates to an internal fixation system for the foot and ankle, comprising: a fixation bracket 300, a tension screw 400, and a foot-ankle fusion plate assembly;

[0082] The fixed bracket 300 includes a fixed plate 310, a front positioning cylinder 320, an arc-shaped connecting rod 330, an outer positioning cylinder 340, and an outer receiving cylinder 350. The two ends of the arc-shaped connecting rod 330 are respectively connected to the front positioning cylinder 320 and the outer positioning cylinder 340. The end of the front positioning cylinder 320 is connected to the fixed plate 310. The fixed plate 310 is provided with a plate through hole 311. The upper plate fixing screw 210 can pass through the plate through hole 311 and the upper plate fixing hole 111 in sequence. The outer receiving cylinder 350 is provided with an outer receiving cylinder 350. The lower end of the outer receiving cylinder 350 is provided with a tooth 351. The outer receiving cylinder 350 is used for the insertion of the tension screw 400.

[0083] In use, the foot and ankle internal fixation system of the present invention has the lower plate 130 installed on the anterior side of the talus 20, and the upper plate fixing screw 210 passing through the plate through hole 311 and the upper plate fixing hole 111 in sequence, and penetrating the tibia 10. After the fixing plate 310 is connected to the upper plate 110, the upper plate fixing screw 210 fixes the upper plate 110 to the tibia 10. The lateral receiving sleeve 350 is disposed on the lateral side of the tibia 10, and the teeth 351 of the lateral receiving sleeve 350 can press against the tibia 10. Part 351 ensures that the lateral receiving sleeve 350 is stably positioned on the tibia 10. Since the traction screw 400 is inserted into the lateral receiving sleeve 350, the lateral receiving sleeve 350 guides the implantation direction of the traction screw 400. Because the traction screw 400 penetrates from the lateral side of the tibia 10 and is not connected to the ankle fusion plate 100, it is easy to adjust the implantation angle of the traction screw 400 to the optimal angle, allowing the traction screw 400 to sequentially penetrate the tibia 10 and talus 20. The design of the fixation bracket 300 optimizes the implantation angle of the traction screw 400, resulting in better overall fusion of the ankle internal fixation system. The anterior positioning sleeve 320 is connected to the lateral positioning sleeve 340 via an arc-shaped connecting rod 330, stabilizing the overall structure of the fixation bracket 300.

[0084] The angle between the central axis of the front positioning cylinder 320 and the central axis of the outer positioning cylinder 340 is 90 degrees. This structure facilitates the placement of the fixing plate 310 on the front and the tension screw 400 on the outer side.

[0085] The upper plate 110 has two grooves 113, and the rear side of the fixing plate 310 has two protrusions 312. The two protrusions 312 correspond one-to-one with the two grooves 113. When the fixing plate 310 covers the upper plate 110, each protrusion 312 is inserted into the corresponding groove 113. The plate through hole 311 is aligned with the corresponding upper plate fixing hole 111. Then the upper plate fixing screw 210 passes through the plate through hole 311 and the upper plate fixing hole 111 in sequence and penetrates the tibia 10. After the fixing plate 310 is connected to the upper plate 110, the two grooves 113 and the upper plate fixing hole 111 corresponding to the plate through hole 311 form a three-point fixing structure, which makes the connection between the fixing plate 310 and the ankle fusion plate 100 more stable.

[0086] The central axis of the outer receiving cylinder 350 is inclined relative to the central axis of the outer positioning cylinder 340. The inclination angle of the central axis of the outer receiving cylinder 350 relative to the central axis of the outer positioning cylinder 340 is determined according to the implantation angle of the tension screw 400.

[0087] In this embodiment Figures 1 to 3The foot and ankle internal fixation system shown is installed on the left leg. A foot and ankle internal fixation system installed on the left leg is a mirror image of such a system. This foot and ankle internal fixation system is an implant used to treat end-stage ankle joint disease. In this embodiment, the inner side of the foot and ankle fusion plate is the right side of the foot and ankle fusion plate, and the right side of the foot and ankle fusion plate is the right side of the left leg.

[0088] To facilitate the installation of the fixing plate 310, among the two upper plate fixing holes 111 located above the leather nail mounting hole 112, the outer upper plate fixing hole 111 corresponds to the plate through hole 311.

[0089] In this embodiment of the foot and ankle internal fixation system, there are three upper plate fixing screws 210; the method of using this embodiment of the foot and ankle internal fixation system includes the following steps:

[0090] 1) The upper plate fixing screw 210 passes through the two upper plate fixing holes 111 located above the cortical nail mounting hole 112, is located in the inner upper plate fixing hole 111, and is fixedly connected to the tibia 10.

[0091] 2) The upper plate fixing screw 210 passes through the two upper plate fixing holes 111 located below the cortical nail mounting hole 112, is located in the inner upper plate fixing hole 111, and is fixedly connected to the tibia 10.

[0092] 3) The three lower plate fixation screws 230 are respectively inserted into the three lower plate fixation holes 131 and fixedly connected to the talus 20;

[0093] 4) The fixing plate 310 covers the upper plate 110, and the teeth 351 of the outer receiving cylinder 350 can press against the tibia 10.

[0094] Each protrusion 312 is inserted into the corresponding groove 113, and the plate through hole 311 is aligned with the corresponding upper plate fixing hole 111. Then the upper plate fixing screw 210 passes through the plate through hole 311 and the upper plate fixing hole 111 in sequence, and passes into the tibia 10, connecting the fixing plate 310 to the upper plate 110.

[0095] 5) The tension screw 400 is inserted into the outer receiving sleeve 350. The tension screw 400 is inserted into the tibia 10 from the outside of the tibia 10. The tension screw 400 is then inserted into the tibia 10 and the talus 20 in sequence.

[0096] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A foot and ankle internal fixation system, characterized in that: The system includes a fixation bracket (300), tension screws (400), and a foot-ankle fusion plate assembly. The foot-ankle fusion plate assembly includes a foot-ankle fusion plate (100), at least two upper plate fixation screws (210), cortical screws, and three lower plate fixation screws (230). The foot-ankle fusion plate (100) includes an upper plate (110), a cross-joint plate (120), and a lower plate (130) connected sequentially from top to bottom. The lower part of the upper plate (110) protrudes forward to form a lower protrusion (114). The cross-joint plate (120) is recessed backward. The upper plate (110) has four upper plate fixation holes (111) and one cortical screw mounting hole (11). 2) Two of the upper plate fixing holes (111) are located above the leather nail mounting holes (112), and the other two upper plate fixing holes (111) are located below the leather nail mounting holes (112); the lower plate (130) is provided with three lower plate fixing holes (131), one of which is located below the other two lower plate fixing holes (131); the upper plate fixing screw (210) is used to be installed in the upper plate fixing hole (111), the leather screw is used to be installed in the leather nail mounting hole (112), and the lower plate fixing screw (230) is used to be installed in the lower plate fixing hole (131); The fixed bracket (300) includes a fixed plate (310), a front positioning cylinder (320), an arc-shaped connecting rod (330), an outer positioning cylinder (340), and an outer receiving cylinder (350); the two ends of the arc-shaped connecting rod (330) are respectively connected to the front positioning cylinder (320) and the outer positioning cylinder (340), the end of the front positioning cylinder (320) is connected to the fixed plate (310), the fixed plate (310) is provided with a plate through hole (311), and the angle between the central axis of the front positioning cylinder (320) and the central axis of the outer positioning cylinder (340) is 90 degrees; The upper plate (110) has two grooves (113), and the rear side of the fixing plate (310) has two protrusions (312), with the two protrusions (312) corresponding to the two grooves (113). When the fixing plate (310) covers the upper plate (110), each protrusion (312) is inserted into the corresponding groove (113), the plate through hole (311) is aligned with the corresponding upper plate fixing hole (111), and the upper plate fixing screw (210) passes through the plate through hole (311) and the corresponding upper plate fixing hole (111) in sequence to connect the fixing plate (310) to the upper plate (110). The two grooves (113) and the upper plate fixing hole (111) corresponding to the plate through hole (311) form a three-point fixing structure. The outer receiving tube (350) is disposed on the outer positioning tube (340). The lower end of the outer receiving tube (350) is provided with teeth (351). The central axis of the outer receiving tube (350) is inclined relative to the central axis of the outer positioning tube (340). The outer receiving tube (350) is for the insertion of the tension screw (400). The tension screw (400) is not connected to the ankle fusion plate (100) and is used to penetrate from the outside of the tibia (10) and sequentially penetrate the tibia (10) and talus (20).

2. The foot and ankle internal fixation system according to claim 1, characterized in that: The thickness of the cross-joint plate (120) is as follows: from the middle of the cross-joint plate (120) toward the upper end of the cross-joint plate (120), the thickness of the cross-joint plate (120) decreases sequentially; from the middle of the cross-joint plate (120) toward the lower end of the cross-joint plate (120), the thickness of the upper end of the cross-joint plate (120) is greater than the thickness of the upper plate (110), and the thickness of the lower end of the cross-joint plate (120) is greater than the thickness of the lower plate (130).

3. The foot and ankle internal fixation system according to claim 1, characterized in that: The four upper plate fixing holes (111) are arranged in a rectangular array.

4. The foot and ankle internal fixation system according to claim 1, characterized in that: The leather nail mounting hole (112) is an elongated hole; the distance between the central axis of the leather nail mounting hole (112) and the central axis of the four upper plate fixing holes (111) is equal.

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