Femur far-end special-shaped block and bridge connecting and fixing device

Abstract

The utility model relates to the technical field of medical instruments, and discloses a thighbone far-end special-shaped block and a bridge connecting and fixing device, and the bridge connecting and fixing device is composed of a connecting rod, the thighbone far-end special-shaped block and a sliding block. The edge of the femur far-end special-shaped block is in an arc shape, a first locking screw hole, a second locking screw hole and a third locking screw hole are formed in the outer surface of the femur far-end special-shaped block along the arc-shaped position of the edge, and a fifth locking screw hole, a sixth locking screw hole and a seventh locking screw hole are formed in the middle of the femur far-end special-shaped block in a circumferential array mode. An eighth locking screw hole is formed in the outer surface of the tail of the thighbone far-end special-shaped block, two connecting holes are formed in the outer surface of the tail of the thighbone far-end special-shaped block, and first through holes are formed in the positions, located on the transverse left side and the transverse right side of the eighth locking screw hole, of the thighbone far-end special-shaped block; and cross holes staggered with the connecting holes are formed in the first through holes. The fixing plate is stable in implantation, the inner side of the far end of the femur is firmly fixed, the stress of the fixing plate is more uniform, and the healing effect of inner side fracture blocks is promoted.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, and particularly relates to a special-shaped block for the distal femur and a bridge connection and fixation device. Background Technique

[0002] Femoral fractures are a common type of fracture in clinical practice. Their reduction and fixation are very difficult. Currently, there are many treatment methods and fixation devices for femoral fractures. Surgical treatment is the preferred treatment method. Usually, during the operation, bone plates or steel plates and locking screws are used to fix the fracture site.

[0003] The existing implantable fixation steel plates for femoral fractures are relatively single. The fixation on the inner side of the distal femur is not firm enough, and the force on the fixation steel plate is not uniform enough, which directly affects the area of the wound and the healing speed. Therefore, a special-shaped block for the distal femur and a bridge connection and fixation device are proposed. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the utility model provides a special-shaped block for the distal femur and a bridge connection and fixation device to solve the problems mentioned in the above background technique.

[0005] To achieve the above object, the utility model provides the following technical solution: A special-shaped block for the distal femur, characterized in that: the overall shape of the special-shaped block for the distal femur is an arc surface structure that fits the distal femur, and its edge is arc-shaped. The outer surface of the special-shaped block for the distal femur is provided with a first locking screw hole, a second locking screw hole, and a third locking screw hole along the arc-shaped edge. The middle part of the special-shaped block for the distal femur is respectively provided with a fifth locking screw hole, a sixth locking screw hole, and a seventh locking screw hole in a circumferential array. The outer surface of the tail of the special-shaped block for the distal femur is provided with an eighth locking screw hole. The first locking screw, the second locking screw, the third locking screw, the fifth locking screw, the sixth locking screw, and the seventh locking screw are all threadedly connected inside the first locking screw hole, the second locking screw hole, the third locking screw hole, the fifth locking screw hole, the sixth locking screw hole, and the seventh locking screw hole. The outer surface of the tail of the special-shaped block for the distal femur is provided with two connecting holes. The special-shaped block for the distal femur is provided with a first through hole on both the left and right sides in the horizontal direction of the eighth locking screw hole. Cross holes that intersect with the connecting holes are provided inside the first through holes.

[0006] Preferably, a fourth locking screw hole is provided on the right side of the second locking screw hole of the special-shaped block for the distal femur. A second locking screw is arranged inside the fourth locking screw hole. The fourth locking screw hole is obliquely arranged. The lower end of the second locking screw is a screwing part, and the upper end of the second locking screw is a smooth part. The diameter of the smooth part is smaller than the diameter of the screwing part.

[0007] Preferably, a plurality of positioning holes are provided on the outer surface of the special-shaped block for the distal femur.

[0008] Adopting the above technical solution, positioning holes are provided for temporarily fixing the femoral distal heteromorphic block during the operation or for threading sutures or cables.

[0009] A bridge connection fixing device is composed of two connecting rods, a femoral distal heteromorphic block, and a slider. Among them, the femoral distal heteromorphic block adopts the above-mentioned femoral distal heteromorphic block. Connecting rods are arranged inside both of the two connecting holes, and sliders are arranged on the outer surfaces of the two connecting rods.

[0010] The slider includes a double-rod three-hole fixing block, a first single-rod double-hole fixing block, a second single-rod double-hole fixing block, and a double-rod double-hole fixing block. Among them, the first single-rod double-hole fixing block is arranged on the outer surface of the front connecting rod, and the second single-rod double-hole fixing block is arranged on the outer surface of the rear connecting rod. First positioning screw holes are opened on the outer surfaces of the transverse two ends of the double-rod three-hole fixing block. Second positioning screw holes are opened at one end of the top outer surface of the first single-rod double-hole fixing block far from the double-rod double-hole fixing block and at one end of the top outer surface of the second single-rod double-hole fixing block close to the double-rod double-hole fixing block. A third positioning screw hole is opened on the top end outer surface of the double-rod double-hole fixing block. Positioning screws are threadedly connected to the inner surfaces of the first positioning screw hole, the second positioning screw hole, and the third positioning screw hole. The number of the double-rod three-hole fixing block, the first single-rod double-hole fixing block, the second single-rod double-hole fixing block, and the double-rod double-hole fixing block is one or more.

[0011] Preferably, a second through hole is opened on the outer surface of the double-rod three-hole fixing block between the two first positioning screw holes. Third through holes are opened at one end of the top outer surface of the first single-rod double-hole fixing block close to the double-rod double-hole fixing block and at one end of the top outer surface of the second single-rod double-hole fixing block far from the double-rod double-hole fixing block. A fourth through hole is opened on the outer surface of the double-rod double-hole fixing block close to the double-rod three-hole fixing block. Positioning pins are arranged inside the first through hole, the second through hole, the third through hole, and the fourth through hole. The end of the positioning pin is a hemispherical surface. A snap ring is threadedly connected to the outer surface of the positioning pin. Anti-rotation protrusions are arranged on the outer surfaces of both sides of the snap ring. Anti-rotation grooves adapted to the anti-rotation protrusions are opened inside the first through hole, the second through hole, the third through hole, and the fourth through hole. A knurled arc groove is arranged on the outer surface of the snap ring.

[0012] Preferably, profiled holes are opened on the outer surfaces of the femoral distal heteromorphic block, the double-rod three-hole fixing block, the first single-rod double-hole fixing block, the second single-rod double-hole fixing block, and the double-rod double-hole fixing block.

[0013] Adopting the above technical solution, the internal stress is relieved by setting profiled holes, and a certain weight reduction effect is achieved.

[0014] Preferably, the edges of the distal femoral special-shaped block, double-rod three-hole fixing block, first single-rod double-hole fixing block, second single-rod double-hole fixing block, and double-rod double-hole fixing block are all provided with rounded corners.

[0015] With the above technical solution, through chamfering treatment, it is possible to avoid scratching muscle tissues and achieve a certain weight reduction effect.

[0016] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0017] 1. For the distal femoral special-shaped block, by setting the distal femoral special-shaped block, double-rod three-hole fixing block, first single-rod double-hole fixing block, second single-rod double-hole fixing block, and double-rod double-hole fixing block in cooperation with multiple locking screw holes, positioning screw holes, and locking screws, stable implantation is achieved, and the fixation of the medial side of the distal femur is firm, making the force on the fixing plate more uniform and promoting the healing of the medial fracture fragment.

[0018] 2. For the distal femoral special-shaped block, by opening an inclined fourth locking screw hole and cooperating with the second locking screw, it solves the problem that the locking screws of the steel plate implanted for femoral fractures in previous surgeries are arranged in parallel and are prone to loosening after being screwed into the fracture site, seriously affecting the treatment effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a front view structural schematic diagram of the bridge connection fixing device of the present utility model;

[0020] Figure 2 It is a structural schematic diagram of the distal femoral special-shaped block of the present utility model;

[0021] Figure 3 It is a top view structural schematic diagram of the connection fixing device of the present utility model;

[0022] Figure 4 It is a top view structural schematic diagram of the distal femoral special-shaped block of the present utility model;

[0023] Figure 5 It is a structural schematic diagram of the positioning pin and its related structures of the present utility model.

[0024] In the figure: 1. Distal femoral special-shaped block; 2. First locking screw hole; 3. Second locking screw hole; 4. Third locking screw hole; 5. Fourth locking screw hole; 6. Fifth locking screw hole; 7. Sixth locking screw hole; 8. Seventh locking screw hole; 9. Eighth locking screw hole; 10. Connecting hole; 11. Connecting rod; 12. Double-rod three-hole fixing block; 13. First single-rod two-hole fixing block; 14. Second single-rod two-hole fixing block; 15. Double-rod two-hole fixing block; 16. First positioning screw hole; 17. Second positioning screw hole; 18. Third positioning screw hole; 19. First through hole; 20. Second through hole; 21. Third through hole; 22. Fourth through hole; 23. Positioning pin; 24. First locking screw; 25. Second locking screw; 26. Positioning screw; 27. Cross hole; 28. Snap ring; 29. Anti-rotation protrusion; 30. Knurled arc groove. Detailed implementation mode

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0026] Embodiment 1:

[0027] Please refer to Figures 1-5, A bridge connection fixing device, comprising: two connecting rods, a distal femoral heteromorphic block 1, and a slider. The slider includes a double-rod three-hole fixing block, a first single-rod double-hole fixing block, a second single-rod double-hole fixing block, and a double-rod double-hole fixing block. The distal femoral heteromorphic block 1 is an arc-shaped structure that fits the distal femur, and its edge is arc-shaped. During a specific femoral fracture surgery, the doctor aligns and fits the distal femoral heteromorphic block 1 of the distal femoral heteromorphic block 1 with the bone surface at the top of the femur. The outer surface of the distal femoral heteromorphic block 1 is provided with a first locking screw hole 2, a second locking screw hole 3, and a third locking screw hole 4 along the arc of the edge. The middle of the distal femoral heteromorphic block 1 is provided with a fifth locking screw hole 6, a sixth locking screw hole 7, and a seventh locking screw hole 8 in a circumferential array. The outer surface of the tail of the distal femoral heteromorphic block 1 is provided with an eighth locking screw hole 9. The first locking screw 24 is threadedly connected to the inside of the first locking screw hole 2, the second locking screw hole 3, the third locking screw hole 4, the fifth locking screw hole 6, the sixth locking screw hole 7, and the seventh locking screw hole 8. The first locking screws 24 are respectively screwed into the first locking screw hole 2, the second locking screw hole 3, the third locking screw hole 4, the fifth locking screw hole 6, the sixth locking screw hole 7, the seventh locking screw hole 8, and the eighth locking screw hole 9. When the locking screw penetrates the locking screw hole, as the locking screw is screwed in, the head part and the screw part of the locking screw pass through the locking screw hole and are implanted into the bone, and finally the distal femoral heteromorphic block 1 is fixed to the bone surface at the top of the femur.

[0028] Two connecting holes 10 are provided on the outer surface of the tail of the distal femoral heteromorphic block 1. Connecting rods 11 are provided inside the two connecting holes 10. The two connecting rods 11 are respectively inserted into the two connecting holes 10. A double-rod three-hole fixing block 12 and a double-rod double-hole fixing block 15 are provided on the outer surface of the two connecting rods 11. A first single-rod double-hole fixing block 13 is provided on the outer surface of the front connecting rod 11, and a second single-rod double-hole fixing block 14 is provided on the outer surface of the rear connecting rod 11. The positions of the double-rod three-hole fixing block 12, the first single-rod double-hole fixing block 13, the second single-rod double-hole fixing block 14, and the double-rod double-hole fixing block 15 on the connecting rod 11 are adjusted. First positioning screw holes 16 are provided on the outer surfaces of the transverse ends of the double-rod three-hole fixing block 12. Second positioning screw holes 17 are provided at one end of the top outer surface of the first single-rod double-hole fixing block 13 away from the double-rod double-hole fixing block 15 and at one end of the top outer surface of the second single-rod double-hole fixing block 14 close to the double-rod double-hole fixing block 15. A third positioning screw hole 18 is provided on the outer surface of the top tail end of the double-rod double-hole fixing block 15. Positioning screws 26 are threadedly connected to the inner surfaces of the first positioning screw hole 16, the second positioning screw hole 17, and the third positioning screw hole 18. The positioning screws 26 are screwed into the first positioning screw hole 16, the second positioning screw hole 17, and the third positioning screw hole 18, thereby fixing the double-rod three-hole fixing block 12, the first single-rod double-hole fixing block 13, the second single-rod double-hole fixing block 14, and the double-rod double-hole fixing block 15.

[0029] On both the left and right sides of the distal femur irregular block 1 in the transverse direction of the eighth locking screw hole 9, a first through hole 19 is provided. On the outer surface between the two first positioning screw holes 16 of the double-rod three-hole fixing block 12, a second through hole 20 is provided. On the outer surface of the top of the first single-rod double-hole fixing block 13 near one end of the double-rod double-hole fixing block 15 and on the outer surface of the top of the second single-rod double-hole fixing block 14 far from one end of the double-rod double-hole fixing block 15, a third through hole 21 is provided. On the outer surface of the top of the double-rod double-hole fixing block 15 near the double-rod three-hole fixing block 12, a fourth through hole 22 is provided. A positioning pin 23 is arranged inside each of the first through hole 19, the second through hole 20, the third through hole 21 and the fourth through hole 22. The end of the positioning pin 23 is a hemispherical surface. A snap ring 28 is threadedly connected to the outer surface of the positioning pin 23. When the connecting rod 11 is inserted into the connecting hole 10, the snap ring 28 is placed in the first through hole 19. Anti-rotation protrusions 29 are arranged on both outer surfaces of the snap ring 28. Anti-rotation grooves adapted to the anti-rotation protrusions 29 are provided inside each of the first through hole 19, the second through hole 20, the third through hole 21 and the fourth through hole 22, so that the anti-rotation protrusions 29 of the snap ring 28 are placed in the anti-rotation grooves. The connecting rod 11 is inserted into the connecting hole 10, and then the positioning pin 23 is screwed in. A knurled arc groove 30 is arranged on the outer surface of the snap ring 28. Cross holes 27 intersecting with the connecting hole 10 are provided inside each of the first through hole 19, the second through hole 20, the third through hole 21 and the fourth through hole 22. When the positioning pin 23 is screwed into the snap ring 28, the knurled arc groove 30 on the snap ring 28 and the hemispherical part of the positioning pin 23 simultaneously press the connecting rod 11 through the cross holes 27, thereby locking the connecting rod 11 in the connecting hole 10. When fixing the double-rod three-hole fixing block 12, the first single-rod double-hole fixing block 13, the second single-rod double-hole fixing block 14 and the double-rod double-hole fixing block 15, the snap ring 28 is respectively placed in the second through hole 20, the third through hole 21 and the fourth through hole 22, and the same steps as above are operated.

[0030] Working principle: When the present utility model is in use, during a specific femoral fracture surgery, the doctor aligns and fits the femoral distal heteromorphic block 1 of the femoral distal heteromorphic block 1 with the bone surface at the femoral top, and screws the first locking screws 24 into the first locking screw holes 2, the second locking screw holes 3, the third locking screw holes 4, the fifth locking screw holes 6, the sixth locking screw holes 7, the seventh locking screw holes 8 and the eighth locking screw holes 9 respectively. When the locking screws pass through the locking screw holes and are screwed in, the head part and the screw part of the locking screws pass through the locking screw holes and are implanted into the bone, finally fixing the femoral distal heteromorphic block 1 on the bone surface at the femoral top. Then, insert the two connecting rods 11 into the two connecting holes 10 respectively, adjust the positions of the double-rod three-hole fixing block 12, the first single-rod two-hole fixing block 13, the second single-rod two-hole fixing block 14 and the double-rod two-hole fixing block 15 on the connecting rods 11, and screw the positioning screws 26 into the first positioning screw holes 16, the second positioning screw holes 17 and the third positioning screw holes 18, thereby fixing the double-rod three-hole fixing block 12, the first single-rod two-hole fixing block 13, the second single-rod two-hole fixing block 14 and the double-rod two-hole fixing block 15.

[0031] When inserting the connecting rod 11 into the connecting hole 10, place the snap ring 28 in the first through hole 19, so that the anti-rotation protrusion 29 of the snap ring 28 is placed in the anti-rotation groove, then pass the connecting rod 11 through the connecting hole 10, and screw in the positioning pin 23. The positioning pin 23 is screwed into the snap ring 28. When screwing in the positioning pin 23, the knurled arc groove 30 on the snap ring 28 and the hemispherical part of the positioning pin 23 simultaneously press the connecting rod 11 through the cross hole 27, thereby locking the connecting rod 11 in the connecting hole 10. When fixing the double-rod three-hole fixing block 12, the first single-rod two-hole fixing block 13, the second single-rod two-hole fixing block 14 and the double-rod two-hole fixing block 15, place the snap ring 28 in the second through hole 20, the third through hole 21 and the fourth through hole 22 respectively, and perform the same steps as above.

[0032] Compared with the related art, a femoral distal heteromorphic block and a bridge connection fixing device provided by the present utility model have the following beneficial effects: achieving stable implantation, firm fixation on the inner side of the femoral distal end, making the force on the fixing plate more uniform, and promoting the healing of the inner fracture block.

[0033] Embodiment 2:

[0034] Please refer to Figures 1-5, on the right side of the second locking hole 3 of the distal femoral heteromorphic block 1, a fourth locking hole 5 is provided. Inside the fourth locking hole 5, a second locking screw 25 is arranged. When fixing the distal femoral heteromorphic block 1 on the femoral bone surface, the second locking screw 25 is screwed into the fourth locking hole 5. The fourth locking hole 5 is obliquely arranged. The lower end of the second locking screw 25 is a screwing part, and the upper end of the second locking screw 25 is a smooth part. The diameter of the smooth part is smaller than that of the screwing part. After the second locking screw 25 contacts the fourth locking hole 5, it is screwed with it. As the second locking screw 25 is screwed in, the screwing part of the second locking screw 25 is screwed with the femoral surface. As the screwing part is screwed and tightened with the femoral surface, the smooth surface of the second locking screw 25 stays in the fourth locking hole 5, and the head of the second locking screw 25 is implanted into the bone. During the implantation process, the second locking screw 25 forms an inclination angle with the vertical plane, so that the second locking screw 25 and a plurality of first locking screws 24 form a triangular stable structure, making the fixation more firm.

[0035] Working principle: When fixing the distal femoral heteromorphic block 1 on the femoral bone surface, the second locking screw 25 is screwed into the fourth locking hole 5. After the second locking screw 25 contacts the fourth locking hole 5, it is screwed with it. As the second locking screw 25 is screwed in, the screwing part of the second locking screw 25 is screwed with the femoral surface. As the screwing part is screwed and tightened with the femoral surface, the smooth surface of the second locking screw 25 stays in the fourth locking hole 5, and the head of the second locking screw 25 is implanted into the bone. During the implantation process, the second locking screw 25 forms an inclination angle with the vertical plane, so that the second locking screw 25 and a plurality of first locking screws 24 form a triangular stable structure, making the fixation more firm.

[0036] Compared with the related technology, a distal femoral heteromorphic block and a bridge connection fixing device provided by the present utility model have the following beneficial effects: It solves the problem that the locking screws of the steel plate implanted in the femoral fracture in the previous operation are arranged in parallel and are prone to loosen after being screwed into the fracture site, seriously affecting the treatment effect.

[0037] For the selection of each device in the above-mentioned equipment usage, different selections are made according to the actual situation, and various parameters are referred to. According to the functions of the used equipment, they correspond to the achieved effects.

[0038] Although the embodiments of the present utility model have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirits of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A distal femoral heterogeneous block, characterized in that: The distal femoral irregular block (1) is integrally an arc-shaped structure that fits the distal femur, and its edge is arc-shaped. On the outer surface of the distal femoral irregular block (1), first locking screw holes (2), second locking screw holes (3), and third locking screw holes (4) are provided along the arc of the edge. Fifth locking screw holes (6), sixth locking screw holes (7), and seventh locking screw holes (8) are respectively arranged in a circumferential array in the middle of the distal femoral irregular block (1). An eighth locking screw hole (9) is opened on the outer surface of the tail of the distal femoral irregular block (1). First locking screws (24) are threadedly connected inside the first locking screw hole (2), second locking screw hole (3), third locking screw hole (4), fifth locking screw hole (6), sixth locking screw hole (7), and seventh locking screw hole (8). Two connecting holes (10) are opened on the outer surface of the tail of the distal femoral irregular block (1). First through holes (19) are opened on both the left and right sides in the horizontal direction of the distal femoral irregular block (1) where the eighth locking screw hole (9) is located. Cross holes (27) that intersect with the connecting holes (10) are opened inside the first through holes (19).

2. The distal femoral shaped block according to claim 1, wherein: A fourth locking screw hole (5) is opened on the right side of the distal femoral irregular block (1) where the second locking screw hole (3) is located. A second locking screw (25) is arranged inside the fourth locking screw hole (5). The fourth locking screw hole (5) is obliquely opened. The lower end of the second locking screw (25) is a screwing part, and the upper end of the second locking screw (25) is a smooth part. The diameter of the smooth part is smaller than the diameter of the screwing part.

3. A distal femoral shaped block according to claim 1, wherein: A number of positioning holes are opened on the outer surface of the distal femoral irregular block (1).

4. A bridge connection fixing device, which consists of two connecting rods (11), a distal femoral special-shaped block (1), and a slider, is characterized in that: The distal femoral irregular block (1) adopts a distal femoral irregular block (1) as described in any one of claims 1-3. Connecting rods (11) are arranged inside the two connecting holes (10). Sliders are arranged on the outer surfaces of the two connecting rods (11).

5. The bridge connection fixing device according to claim 4, characterized in that, The slider includes a double-bar triple-hole fixing block (12), a first single-bar double-hole fixing block (13), a second single-bar double-hole fixing block (14), and a double-bar double-hole fixing block (15); wherein, a first single-bar double-hole fixing block (13) is provided on the outer surface of the front-side connecting bar (11), a second single-bar double-hole fixing block (14) is provided on the outer surface of the rear-side connecting bar (11), first positioning screw holes (16) are formed on the outer surfaces of the transverse two ends of the double-bar triple-hole fixing block (12), second positioning screw holes (17) are formed at one end of the top outer surface of the first single-bar double-hole fixing block (13) away from the double-bar double-hole fixing block (15) and at one end of the top outer surface of the second single-bar double-hole fixing block (14) close to the double-bar double-hole fixing block (15), a third positioning screw hole (18) is formed on the outer surface of the top end of the double-bar double-hole fixing block (15), positioning screws (26) are threadedly connected to the inner surfaces of the first positioning screw holes (16), second positioning screw holes (17), and third positioning screw holes (18), and the number of the double-bar triple-hole fixing block (12), first single-bar double-hole fixing block (13), second single-bar double-hole fixing block (14), and double-bar double-hole fixing block (15) is one or more.

6. The bridge connection fixing device according to claim 5, characterized in that: A second through hole (20) is formed on the outer surface of the double-bar triple-hole fixing block (12) between the two first positioning screw holes (16), third through holes (21) are formed at one end of the top outer surface of the first single-bar double-hole fixing block (13) close to the double-bar double-hole fixing block (15) and at one end of the top outer surface of the second single-bar double-hole fixing block (14) away from the double-bar double-hole fixing block (15), a fourth through hole (22) is formed on the outer surface of the top of the double-bar double-hole fixing block (15) close to the double-bar triple-hole fixing block (12), positioning pins (23) are arranged inside the first through hole (19), second through hole (20), third through hole (21), and fourth through hole (22), the end of the positioning pin (23) is a hemispherical surface, a snap ring (28) is threadedly connected to the outer surface of the positioning pin (23), anti-rotation protrusions (29) are arranged on the outer surfaces of both sides of the snap ring (28), anti-rotation grooves adapted to the anti-rotation protrusions (29) are formed inside the first through hole (19), second through hole (20), third through hole (21), and fourth through hole (22), and a knurled arc groove (30) is arranged on the outer surface of the snap ring (28).

7. A bridge connection fixing device according to claim 5, characterized in that: Irregular holes are formed on the outer surfaces of the distal femur irregular block (1), double-bar triple-hole fixing block (12), first single-bar double-hole fixing block (13), second single-bar double-hole fixing block (14), and double-bar double-hole fixing block (15).

8. A bridge connection fixing device according to claim 5, characterized in that: The edges of the distal femur irregular block (1), double-bar triple-hole fixing block (12), first single-bar double-hole fixing block (13), second single-bar double-hole fixing block (14), and double-bar double-hole fixing block (15) are all provided with rounded corners.

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