A combined fracture internal fixation device

Abstract

The present invention provides a combined fracture internal fixation device, which includes a fixing rod and a plurality of sliding fixing members slidably mounted on the fixing rod. A torsion locking member is rotatably mounted above each of the plurality of sliding fixing members. A upper half clamping cover is slidably mounted on one side of the torsion locking member. The torsion locking member is used to twist the using direction of the upper half clamping cover, and the upper half clamping cover is used to cooperate to eliminate the installation deviation of the surgical screw. The present invention can adapt to more surgical plans and can match the differences caused by some bone difference factors, so as to solve the problem that the existing screw installation holes are often pre-fixed and non-adjustable. Due to factors such as the fracture site, type and individual bone differences of different patients, this design of fixed holes is often difficult to accurately adapt, and even requires a second operation to adjust the fixation method.

Description

Technical Field

[0001] The present invention relates to the technical field of medical instruments, and in particular, to a combined fracture internal fixation device. Background Art

[0002] In the field of fracture treatment, internal fixation devices play a crucial role in promoting the healing of fracture sites. For traditional fracture internal fixation devices, the screw mounting hole positions are often pre-fixed and non-adjustable. In actual clinical applications, due to factors such as the fracture site, type, and individual skeletal differences of different patients, this design of fixed hole positions is often difficult to accurately adapt. For example, in the face of complex fracture situations, doctors may encounter that the existing internal fixation device hole positions do not match the actual positions where fixation is required at the fracture site, resulting in an inability to achieve an ideal fixation effect. This may not only affect the fracture healing process, but also increase the surgical difficulty and risk, and even require a second operation to adjust the fixation method.

[0003] The innovation of this combined fracture internal fixation device lies in its ability to adapt and adjust the screw mounting hole positions, promising to solve the drawbacks of the above traditional devices and providing a more flexible and accurate solution for fracture treatment. Summary of the Invention

[0004] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide a combined fracture internal fixation device that can adapt to more surgical plans and can match the differences caused by some skeletal difference factors, so as to solve the problem that the existing screw mounting hole positions are often pre-fixed and non-adjustable. Due to factors such as the fracture site, type, and individual skeletal differences of different patients, this design of fixed hole positions is often difficult to accurately adapt, and even requires a second operation to adjust the fixation method.

[0005] To achieve the above purpose, the present invention is implemented through the following technical solutions: A combined fracture internal fixation device includes a fixing rod and multiple groups of sliding fixing members slidably mounted on the fixing rod. A torsion locking member is rotatably mounted above each group of the sliding fixing members. A upper half cover is slidably mounted on one side of the torsion locking member. The torsion locking member is used to twist the using direction of the upper half cover, and the upper half cover is used to cooperate to eliminate the installation deviation of the surgical screw; It further includes:

[0006] A fine-tuning locking mechanism is arranged inside the upper half cover and is used to fine-tune the position between the upper half cover and the torsion locking member and then lock and fix it;

[0007] A screw inclination adaptation mechanism is arranged inside the upper half cover and is used to adjust and adapt the inclination angle of the surgical screw;

[0008] A torsion angle locking assembly is arranged inside the torsion locking member and is used to lock the torsion locking member after adjusting the angle.

[0009] Furthermore, the fine-tuning locking mechanism includes a sliding rod, a slide rod locking bolt, a slide rod locking hole, and an adjustment hole. A lower half cover is provided at the bottom of the upper half cover. The sliding rods are symmetrically and fixedly installed on the side of the lower half cover close to the torsion locking member. The slide rod locking hole is opened inside the torsion locking member and above the sliding rod. The slide rod locking bolt is threadedly connected inside the slide rod locking hole. The adjustment hole is opened inside the torsion locking member and is in sliding fit with the sliding rod.

[0010] Furthermore, the screw inclination adaptation mechanism includes a sliding bushing, a bushing fixing bolt, a sliding groove, and a bushing locking hole. An adjustable bolt fixing sleeve is rotatably installed between the upper half cover and the lower half cover. Both ends of the adjustable bolt fixing sleeve are in rotational fit with the sliding bushing. The sliding grooves are symmetrically opened on the sides of the upper half cover and the lower half cover close to each other. The sliding bushing is slidably installed inside the sliding groove. The bushing locking hole is opened at the top of the sliding bushing. The bushing fixing bolt is threadedly connected inside the bushing locking hole. The bolt head of the bushing fixing bolt is in pressing fit with the top of the upper half cover.

[0011] Furthermore, the torsion angle locking assembly includes a position locking bolt and a locking nut. The position locking bolt is rotatably installed inside the torsion locking member. The locking nut is fixedly embedded at the bottom of the sliding fixing member. The bottom of the position locking bolt sequentially penetrates through the torsion locking member and the sliding fixing member from top to bottom and extends into the locking nut to be threadedly connected with the locking nut.

[0012] Furthermore, an adjustment groove is opened on the side of the top of the sliding fixing member away from the torsion locking member. A sliding bolt fixing sleeve is slidably installed on the left side of the sliding fixing member. A fixing hole is opened on the side of the top of the sliding bolt fixing sleeve away from the torsion locking member, and the fixing hole is used in cooperation with a bolt to be fixedly installed with the sliding fixing member.

[0013] Furthermore, bolt moving grooves are opened on both sides of the top of the upper half cover and above the sliding grooves. The bolt moving grooves are in sliding fit with the bushing fixing bolts. Angle torsion openings are opened inside the upper half cover and at the bottom of the lower half cover. The angle torsion openings are used in cooperation with the adjustable bolt fixing sleeve.

[0014] Furthermore, three groups of positioning holes are opened on the top of the upper half cover and are distributed at equal intervals in a ring shape. Three groups of connecting bolts are fixedly installed on the top of the lower half cover and are distributed at equal intervals in a ring shape, and the connecting bolts are threadedly connected with the positioning holes.

[0015] Furthermore, clamping grooves for sliding fit with fixing rods are opened on both sides inside the sliding fixing member.

[0016] Furthermore, both the fixed rod and the sliding fixing member are made of stainless steel, and the surface is coated with tricalcium phosphate bone cement. The torsion locking member, the upper half cover, and the adjustable bolt sleeve are all made of stainless steel, and the surface is coated with hydroxyapatite.

[0017] Advantages of the present invention: By setting the fixed rod in cooperation with multiple groups of slidably mounted sliding fixing members, the position of the sliding fixing members on the fixed rod can be flexibly adjusted according to the fracture sites and types of different patients, adapting to different fracture positions. At the same time, the position locking bolt in the torsion angle locking assembly cooperates with the locking nut to squeeze the torsion locking member and the sliding fixing member, causing the clamping groove inside the sliding fixing member to deform and clamp the fixed rod, achieving stable fixation of the position of the sliding fixing member, improving the surgical efficiency, and expanding the surgical plan. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Other features, objects, and advantages of the present invention will become more apparent by reading the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0019] Figure 1 is a schematic structural diagram of the present invention;

[0020] Figure 2 is a three-dimensional structural diagram of the torsion locking member;

[0021] Figure 3 is for Figure 2 the upward three-dimensional structural diagram;

[0022] Figure 4 is for Figure 2 the partial semi-sectional three-dimensional structural diagram in

[0023] Figure 5 is for the present invention Figure 4 the partial exploded three-dimensional structural diagram;

[0024] Figure 6 is the three-dimensional schematic diagram after the upper half cover of the present invention is twisted;

[0025] Figure 7 is the exploded three-dimensional diagram of the sliding fixing member of the present invention;

[0026] Figure 8 is the semi-sectional exploded three-dimensional structural diagram of the sliding fixing member of the present invention;

[0027] Figure 9 is the schematic diagram of the operation plan of the present invention.

[0028] In the figure: 1, fixed rod; 2, sliding fixing member; 201, adjusting groove; 202, clamping groove; 21, sliding bolt fixing sleeve; 2101, fixing hole; 3, torsion locking member; 31, upper half clamping cover; 3101, positioning hole; 3102, bolt moving groove; 3103, angle torsion port; 3301, connecting bolt; 32, adjustable bolt fixing sleeve; 3201, sliding shaft sleeve; 3202, shaft sleeve fixing bolt; 3203, sliding groove; 3204, shaft sleeve locking hole; 33, lower half clamping cover; 331, sliding rod; 332, sliding rod locking bolt; 333, sliding rod locking hole; 334, adjusting hole; 301, position locking bolt; 302, locking nut; 4, locking screw; 5, fractured bone. Detailed implementation manners

[0029] To make the technical means, creative features, achieved purposes and functions of the present invention easy to understand, the present invention will be further described below in conjunction with specific implementation manners.

[0030] Please refer to Figure 1 and Figure 2 , Figure 1 , which is the structural schematic diagram of the present invention; Figure 2 is the three-dimensional structural schematic diagram of the torsion locking member.

[0031] A combined fracture internal fixation device includes a fixed rod 1 and multiple groups of sliding fixing members 2 slidably installed on the fixed rod 1. A torsion locking member 3 is rotatably installed above each group of sliding fixing members 2. A upper half clamping cover 31 is slidably installed on one side of the torsion locking member 3. The torsion locking member 3 is used to twist the using direction of the upper half clamping cover 31, and the upper half clamping cover 31 is used to cooperate to eliminate the installation deviation of the surgical screw.

[0032] Please refer to Figures 3 to 9 shown, Figure 3 is Figure 2 the bottom-up three-dimensional structural schematic diagram of Figure 4 is Figure 2 the partial half-section three-dimensional structural schematic diagram in Figure 5 is the partial exploded three-dimensional structural schematic diagram of the present invention Figure 4 ; Figure 6 is the three-dimensional schematic diagram after the upper half clamping cover of the present invention is twisted; Figure 7 is the exploded three-dimensional structural schematic diagram of the sliding fixing member of the present invention; Figure 8 is the semi-section exploded three-dimensional structural schematic diagram of the sliding fixing member of the present invention; Figure 9 is the operation plan schematic diagram of the present invention.

[0033] It further includes: a fine-tuning locking mechanism, which is arranged inside the upper half cover 31 and is used to fine-tune the position between the upper half cover 31 and the torsion locking member 3 and then lock and fix it; the fine-tuning locking mechanism includes a sliding rod 331, a slide rod locking bolt 332, a slide rod locking hole 333 and an adjustment hole 334. A lower half cover 33 is arranged at the bottom of the upper half cover 31. The sliding rod 331 is symmetrically and fixedly installed on the side of the lower half cover 33 close to the torsion locking member 3. The slide rod locking hole 333 is opened inside the torsion locking member 3 and is located above the sliding rod 331. The slide rod locking bolt 332 is threadedly connected inside the slide rod locking hole 333. The adjustment hole 334 is opened inside the torsion locking member 3 and is slidably matched with the sliding rod 331;

[0034] The sliding rod 331 can cooperate with the adjustment hole 334 to slide and adjust inside the torsion locking member 3, change the distance between the upper half cover 31 and the torsion locking member 3, and thus adapt to some installation spacings during the operation. At the same time, after the spacing is determined, the slide rod locking bolt 332 can be twisted by an internal hexagon wrench, and then the sliding rod 331 is pressed down and fixed by the cooperation of the slide rod locking bolt 332 and the slide rod locking hole 333, making the orthopedic operation have more operating space.

[0035] A screw inclination adaptation mechanism, which is arranged inside the upper half cover 31 and is used to adjust and adapt the inclination angle of the surgical screw; the screw inclination adaptation mechanism includes a sliding bushing 3201, a bushing fixing bolt 3202, a sliding groove 3203 and a bushing locking hole 3204. An adjustable bolt fixing sleeve 32 is rotatably installed between the upper half cover 31 and the lower half cover 33. Both ends of the adjustable bolt fixing sleeve 32 are rotatably matched with the sliding bushing 3201. The sliding grooves 3203 are symmetrically opened on the sides of the upper half cover 31 and the lower half cover 33 close to each other. The sliding bushing 3201 is slidably installed inside the sliding groove 3203. The bushing locking hole 3204 is opened at the top of the sliding bushing 3201. The bushing fixing bolt 3202 is threadedly connected inside the bushing locking hole 3204. The bolt head of the bushing fixing bolt 3202 is pressed and matched with the top of the upper half cover 31;

[0036] The sliding bushing 3201 can cooperate with the sliding groove 3203 to slide and adjust, so that the locking screw 4 has a greater installation freedom during installation. The bushing fixing bolt 3202 can make the adjustable bolt fixing sleeve 32 rotate inside to change the inclination angle, and its installation operation method is Figure 9As shown, the bushing fixing bolt 3202 can rotate and be threadedly engaged with the sliding bushing 3201 after the position of the sliding bushing 3201 is adjusted. When the bushing fixing bolt 3202 is threadedly engaged with the sliding bushing 3201, an upward force can be applied to the sliding bushing 3201 when the bushing fixing bolt 3202 is twisted. The bolt head of the twisted bushing fixing bolt 3202 can have a downward force. Subsequently, the sliding bushing 3201 and the bushing fixing bolt 3202 can clamp and fix the upper half cover 31 to each other, and then the position of the sliding bushing 3201 can be fixed by the bushing fixing bolt 3202.

[0037] The torsion angle locking assembly is disposed inside the torsion locking member 3 and is used to lock the torsion locking member 3 after the adjustment of the angle; the torsion angle locking assembly includes a position locking bolt 301 and a locking nut 302. The position locking bolt 301 is rotatably installed inside the torsion locking member 3, and the locking nut 302 is fixedly embedded at the bottom of the sliding fixing member 2. The bottom of the position locking bolt 301 sequentially penetrates through the torsion locking member 3 and the sliding fixing member 2 from top to bottom and extends into the inside of the locking nut 302 to be threadedly connected with the locking nut 302.

[0038] The position locking bolt 301 can be twisted by an Allen bolt. The twisted position locking bolt 301 can cooperate with the locking nut 302 to move downward to squeeze the torsion locking member 3 and the sliding fixing member 2, forcing the clamping groove 202 inside the sliding fixing member 2 to deform and then clamping the fixing rod 1 to fix the position of the sliding fixing member 2.

[0039] An adjustment groove 201 is formed on one side of the top of the sliding fixing member 2 away from the torsion locking member 3. A sliding bolt fixing sleeve 21 is slidably installed on the left side of the sliding fixing member 2. A fixing hole 2101 is formed on one side of the top of the sliding bolt fixing sleeve 21 away from the torsion locking member 3, and the fixing hole 2101 is fixedly installed with the sliding fixing member 2 in cooperation with a bolt.

[0040] The adjustment groove 201 can facilitate the locking screw 4 to penetrate through the sliding fixing member 2 from top to bottom and cooperate with the sliding bolt fixing sleeve 21 for fixing operations. The locking screw 4 is inserted into the broken bone 5. The fixing hole 2101 can facilitate the installation of the bolt to fix the sliding bolt fixing sleeve 21 inside the sliding fixing member 2. At the same time, when conventional installation and fixation surgeries are not required, removing the bolt on the fixing hole 2101 can facilitate the removal of the sliding bolt fixing sleeve 21, and further facilitate the implementation of the orthopedic surgery plan with a special operation plan for the adjustable bolt fixing sleeve 32.

[0041] On both sides of the top of the upper half cover 31 and above the sliding groove 3203, there are bolt moving grooves 3102 which are in sliding fit with the bushing fixing bolts 3202. Angle twisting ports 3103 are provided inside the upper half cover 31 and at the bottom of the lower half cover 33, and the angle twisting ports 3103 are used in cooperation with the adjustable bolt fixing sleeves 32;

[0042] The bolt moving grooves 3102 facilitate the sliding of the bushing fixing bolts 3202 on the upper half cover 31, and the angle twisting ports 3103 facilitate the movement and adjustment of the adjustable bolt fixing sleeves 32.

[0043] On the top of the upper half cover 31, there are three groups of positioning holes 3101 distributed at equal intervals in a ring shape. On the top of the lower half cover 33, three groups of connecting bolts 3301 distributed at equal intervals in a ring shape are fixedly installed, and the connecting bolts 3301 are in threaded connection with the positioning holes 3101;

[0044] The positioning holes 3101 can cooperate with the connecting bolts 3301 to fix the upper half cover 31 and the lower half cover 33 into one body, facilitating the combined installation of the sliding bushing 3201 and the adjustable bolt fixing sleeve 32 inside the lower half cover 33, and making their installation stable.

[0045] On both sides inside the sliding fixing member 2, there are clamping grooves 202 for sliding fit with the fixing rods 1;

[0046] The formation of the clamping grooves 202 enables the sliding fixing member 2 to be clamped and locked by the position locking bolt 301 after sliding, and the deformation of the clamping groove 202 clamps the surface of the fixing rod 1 to achieve position fixation.

[0047] Both the fixing rod 1 and the sliding fixing member 2 are made of stainless steel, and the surface is coated with tricalcium phosphate bone cement. The torsion locking member 3, the upper half cover 31 and the adjustable bolt fixing sleeve 32 are all made of stainless steel, and the surface is coated with hydroxyapatite; the surface of stainless steel is relatively smooth, which is not conducive to the attachment of bone tissue; after coating with hydroxyapatite or tricalcium phosphate bone cement, the surface roughness of the implant increases, providing more attachment points for bone tissue, facilitating the growth of bone tissue into the implant, enhancing the mechanical interlocking between the implant and bone tissue, and further improving the fixation effect. At the same time, although stainless steel has good strength and corrosion resistance, its biocompatibility is relatively poor, which may cause immune reactions or allergic reactions in the human body; while hydroxyapatite and tricalcium phosphate bone cement have excellent biocompatibility, which can reduce the rejection reaction of the body to the implant, making the patient more comfortable during the postoperative recovery process and reducing the occurrence of complications.

[0048] Working principle: Overall installation and preliminary positioning: Place the fixing rod 1 at the appropriate fracture site. Multiple groups of sliding fixing parts 2 are slidably installed on the fixing rod 1 through the clamping grooves 202. According to the specific conditions of the fracture site, preliminarily adjust the position of the sliding fixing parts 2 on the fixing rod 1. Subsequently, twist the position locking bolt 301. The position locking bolt 301 cooperates with the locking nut 302 to move downward and squeeze the torsion locking part 3 and the sliding fixing part 2, causing the clamping groove 202 inside the sliding fixing part 2 to deform and clamp the fixing rod 1, thereby fixing the position of the sliding fixing part 2;

[0049] Fine-tuning the position of the upper half cover 31: When it is necessary to adjust the distance between the upper half cover 31 and the torsion locking part 3 to adapt to the surgical installation spacing, the sliding rod 331 slides inside the torsion locking part 3 in cooperation with the adjustment hole 334 to change the position of the upper half cover 31. After determining the spacing, use an Allen wrench to twist the slide rod locking bolt 332. The slide rod locking bolt 332 cooperates with the slide rod locking hole 333 to move downward and press the sliding rod 331 to fix the sliding rod 331, thereby realizing the fine-tuning and locking of the position of the upper half cover 31;

[0050] Adjusting the inclination angle of the surgical screw: When installing the surgical screw, if it is necessary to adjust its inclination angle, the sliding bushing 3201 slides and adjusts in cooperation with the sliding groove 3203, providing a greater degree of freedom for the installation of the locking screw 4. At the same time, the bushing fixing bolt 3202 can make the adjustable bolt fixing sleeve 32 rotate inside, changing its inclination angle. After adjusting the position of the sliding bushing 3201, rotate the bushing fixing bolt 3202 to make it threadedly engage with the sliding bushing 3201. During the process of twisting the bushing fixing bolt 3202, the sliding bushing 3201 receives an upward force, and the bolt head of the bushing fixing bolt 3202 generates a downward force. The two interact to clamp the upper half cover 31, thereby fixing the position of the sliding bushing 3201 and realizing the adjustment and locking of the inclination angle of the surgical screw;

[0051] Eliminating the installation deviation of the surgical screw: Through the adjustment of the above-mentioned fine-tuning locking mechanism and screw inclination adaptation mechanism, the upper half cover 31 can cooperate to eliminate the installation deviation of the surgical screw, enabling the surgical screw to be installed more accurately at the fracture site and improving the fixation effect;

[0052] Adapting to special surgical plans: When conventional installation and fixation surgeries are not required, remove the bolt on the fixing hole 2101 of the sliding bolt fixing sleeve 21, and it can be removed from the sliding fixing part 2. Furthermore, it is convenient for the adjustable bolt fixing sleeve 32 to perform operations for special orthopedic surgical plans, enabling the device to adapt to more surgical plans and match the differences caused by some bone difference factors;

[0053] Biocompatibility and enhanced fixation effect: The tricalcium phosphate bone cement coated on the surface of the fixing rod 1 and the sliding fixing member 2, as well as the hydroxyapatite coated on the surface of the torsion locking member 3, the upper half cover 31, and the adjustable bolt fixing sleeve 32, increase the surface roughness of the implant, which is beneficial to the ingrowth of bone tissue and enhances the mechanical interlocking between the implant and the bone tissue. At the same time, due to the excellent biocompatibility of hydroxyapatite and tricalcium phosphate bone cement, the rejection reaction of the body to the implant is reduced, the occurrence of complications is decreased, and the healing of the fracture site is further promoted.

[0054] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.

[0055] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A combined fracture internal fixation device, comprising a fixing rod (1) and a plurality of sliding fixing members (2) slidably mounted on the fixing rod (1), characterized in that: Above each of the multiple groups of the sliding fixing members (2), a torsion locking member (3) is rotatably installed. A upper half clamping cover (31) is slidably installed on one side of the torsion locking member (3). The torsion locking member (3) is used to twist the using direction of the upper half clamping cover (31), and the upper half clamping cover (31) is used to cooperate to eliminate the installation deviation of the surgical screw. Further included are: A fine-tuning locking mechanism, which is arranged inside the upper half clamping cover (31) and is used to fine-tune the position between the upper half clamping cover (31) and the torsion locking member (3) and then lock and fix it; A screw inclination adaptation mechanism, which is arranged inside the upper half clamping cover (31) and is used to adjust and adapt to the inclination angle of the surgical screw; A torsion angle locking assembly, which is arranged inside the torsion locking member (3) and is used to lock the torsion locking member (3) after adjusting the angle; The fine-tuning locking mechanism includes a sliding rod (331), a slide rod locking bolt (332), a slide rod locking hole (333) and an adjustment hole (334). A lower half clamping cover (33) is arranged at the bottom of the upper half clamping cover (31). The sliding rods (331) are symmetrically and fixedly installed on the side of the lower half clamping cover (33) close to the torsion locking member (3). The slide rod locking hole (333) is opened inside the torsion locking member (3) and is located above the sliding rod (331). The slide rod locking bolt (332) is threadedly connected inside the slide rod locking hole (333). The adjustment hole (334) is opened inside the torsion locking member (3) and is slidably matched with the sliding rod (331).

2. The combined fracture internal fixation device according to claim 1, wherein: The screw inclination adaptation mechanism includes a sliding shaft sleeve (3201), a shaft sleeve fixing bolt (3202), a sliding groove (3203) and a shaft sleeve locking hole (3204). An adjustable bolt fixing sleeve (32) is rotatably installed between the upper half clamping cover (31) and the lower half clamping cover (33). The two ends of the adjustable bolt fixing sleeve (32) are rotatably matched with the sliding shaft sleeve (3201). The sliding grooves (3203) are symmetrically opened on the sides of the upper half clamping cover (31) and the lower half clamping cover (33) close to each other. The sliding shaft sleeve (3201) is slidably installed inside the sliding groove (3203). The shaft sleeve locking hole (3204) is opened at the top of the sliding shaft sleeve (3201). The shaft sleeve fixing bolt (3202) is threadedly connected inside the shaft sleeve locking hole (3204). The bolt head of the shaft sleeve fixing bolt (3202) is pressed and matched with the top of the upper half clamping cover (31).

3. The combined fracture internal fixation device according to claim 1, characterized in that: The torsion angle locking assembly includes a position locking bolt (301) and a locking nut (302). The position locking bolt (301) is rotatably installed inside the torsion locking member (3). The locking nut (302) is fixedly embedded at the bottom of the sliding fixing member (2). The bottom of the position locking bolt (301) sequentially penetrates through the torsion locking member (3) and the sliding fixing member (2) from top to bottom and extends into the locking nut (302) to be threadedly connected with the locking nut (302).

4. The combined fracture internal fixation device according to claim 1, wherein: On one side of the top of the sliding fixing member (2) away from the torsion locking member (3), an adjustment groove (201) is provided. A sliding bolt fixing sleeve (21) is slidably installed on the left side of the sliding fixing member (2). On one side of the top of the sliding bolt fixing sleeve (21) away from the torsion locking member (3), a fixing hole (2101) is provided, and the fixing hole (2101) is fixedly installed with the sliding fixing member (2) by means of a bolt.

5. The combined fracture internal fixation device according to claim 2, characterized in that: On both sides of the top of the upper half clamping cover (31) and above the sliding groove (3203), bolt moving grooves (3102) are provided. The bolt moving grooves (3102) are slidably matched with the sleeve fixing bolts (3202). Angle torsion openings (3103) are provided inside the upper half clamping cover (31) and at the bottom of the lower half clamping cover (33). The angle torsion openings (3103) are used in cooperation with the adjustable bolt fixing sleeves (32).

6. The modular fracture internal fixation device according to claim 1, wherein: On the top of the upper half clamping cover (31), three groups of positioning holes (3101) are provided in an annular and equally spaced manner. On the top of the lower half clamping cover (33), three groups of connecting bolts (3301) are fixedly installed in an annular and equally spaced manner, and the connecting bolts (3301) are threadedly connected with the positioning holes (3101).

7. The modular fracture internal fixation device according to claim 1, wherein: Clamping grooves (202) for slidably matching with the fixing rods (1) are provided on both sides inside the sliding fixing member (2).

8. The modular fracture internal fixation device according to claim 2, wherein: Both the fixing rod (1) and the sliding fixing member (2) are made of stainless steel, and the torsion locking member (3), the upper half clamping cover (31), and the adjustable bolt fixing sleeve (32) are all made of stainless steel.

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