A retractable intramedullary nail system

Abstract

This invention provides a retractable intramedullary nail system, belonging to the field of medical device technology. It includes an anterior bone body, a posterior bone body, and a limiting mechanism. A fixing sleeve is slidably connected to the inner wall of the fixing groove, a sliding rod is slidably connected to the inner wall of the fixing sleeve, and a connecting sleeve is slidably connected to the inner wall of one end of the fixing sleeve. The key feature is that the inner wall of the fixing sleeve is provided with a limiting mechanism to prevent the sliding rod from shifting backward. As the anterior and posterior bone bodies grow, their overall length changes. Simultaneously, the sliding rod and fixing sleeve slide relative to each other through the connecting sleeve, extending the overall length and achieving co-growth with the bone. The sliding rod and fixing sleeve placed in the anterior and posterior bone bodies can form an intramedullary nail effect, which can be used to prevent or stabilize fractures, or to correct deformities of long bones during growth, for use by patients with osteogenesis imperfecta, skeletal dysplasia, and other skeletal deformities.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and more specifically, to a retractable intramedullary nail system. Background Technology

[0002] Intramedullary nails are orthopedic internal fixation devices in the medical device field. Their structure includes an intramedullary nail rod with a proximal locking screw hole at its proximal end. A decompression plane is provided on the surface of the intramedullary nail rod. One or more elongated decompression planes are provided on the surface of the intramedullary nail rod, extending from the proximal end to the distal end. A locking screw positioning screw hole and a connecting sleeve positioning groove are provided at the proximal end of the intramedullary nail rod.

[0003] However, conventional intramedullary nails are only suitable for bones that have stopped growing, and are not suitable for adolescents with osteogenesis imperfecta, skeletal dysplasia, and other skeletal deformities whose epiphyses have not closed. Because the bones of these patients continue to grow over time, the fixed intramedullary nail cannot grow with the bone, thus failing to effectively stabilize fractures or correct deformities of long bones during growth. Summary of the Invention

[0004] In view of the problem that existing intramedullary nails cannot grow with the bone, thus failing to effectively stabilize fractures or correct deformities of long bones during growth, the purpose of this invention is to provide a retractable intramedullary nail fixation device.

[0005] To solve the above problems, the present invention adopts the following technical solution.

[0006] A retractable intramedullary nail system includes an anterior bone body, a posterior bone body, and a limiting mechanism. The surfaces of the anterior and posterior bone bodies are provided with a fixing groove and a sliding groove. A fixing sleeve is slidably connected to the inner wall of the fixing groove, a sliding rod is slidably connected to the inner wall of the fixing sleeve, and a connecting sleeve is slidably connected to the inner wall of one end of the fixing sleeve.

[0007] The inner wall of the fixing sleeve is provided with a limiting mechanism, the limiting mechanism including a first groove. The first groove is opened inside one end of the fixing sleeve. Two sets of spring grooves are opened on both sides of the inner wall of the first groove. A spring is installed inside the spring groove. Two sets of rotating rods are rotatably connected inside the first groove. A baffle is fixedly connected to the surface of the rotating rod. A stop block is fixedly connected to one end of the baffle. A spring groove is fixedly connected to one end of the spring, and a baffle is fixedly connected to the other end. The surface of the connecting sleeve is provided with a fixing mechanism for fixing the fixing sleeve to the anterior bone body.

[0008] Optionally, one end of the slide bar is rotatably connected to multiple sets of connecting rings, and the surface of the connecting rings is fixedly connected to two sets of connecting blocks.

[0009] Optionally, one end of the slide rod is fixedly connected to a connecting rod, and the other end is fixedly connected to a threaded rod, with the connecting rod slidably connected to the inner wall of the connecting sleeve.

[0010] Optionally, one end of the threaded rod is fixedly connected to a pointed tip, and one end of the connecting rod is provided with a hexagonal groove.

[0011] Optionally, the fixing mechanism includes a second groove, a fixing ring, a fixing block, an inclined surface, a limiting groove, a limiting block, a locking block, and an inclined block. The second groove is provided inside one end of the fixing sleeve. Multiple sets of fixing rings are rotatably connected to one end of the connecting sleeve. Two sets of fixing blocks are fixedly connected to the surface of the fixing rings. An inclined surface is provided on one side of the fixing block. Multiple sets of limiting grooves are provided on the inner wall of the second groove. A limiting block is slidably connected to the inner wall of the limiting groove. A locking block is fixedly connected to the surface of the limiting block. Multiple sets of locking blocks are slidably connected inside the fixing sleeve. An inclined block is fixedly connected to one side of the locking block. One end of the inclined block cooperates with the inclined surface.

[0012] Optionally, the limiting groove is provided with a guide cavity that matches the outer contour of the limiting block. The inner surface of the guide cavity and the outer surface of the limiting block maintain a fitting gap of 0.05-0.2mm. The size of the fitting gap is configured to allow the limiting block to make reciprocating linear motion without jamming along the axial direction of the limiting groove.

[0013] Optionally, one end of the fixing sleeve has an internal thread, and the surface of the connecting sleeve has an external thread, with the internal thread engaging with the external thread.

[0014] Optionally, a rotating block is fixedly connected to one end of the connecting sleeve, a hexagonal block is fixedly connected to one end of the rotating block, and one end of the anterior bone body cooperates with the rotating block.

[0015] Optionally, a limiting rod is fixedly connected to the bottom of the fixed sleeve, and a limiting rod is slidably connected to the inner wall of the sliding groove.

[0016] Optionally, one end of the limiting rod is provided with a connecting mechanism, the connecting mechanism including a fixing rod groove, one end of the limiting rod is provided with a fixing rod groove, a fixing rod is slidably connected inside the fixing rod groove, one end of the fixing rod is fixedly connected with a slider, the sliding groove cooperates with the slider, one end of the slider is provided with a screw hole, the inner wall of the screw hole is threaded with a screw, and one end of the screw cooperates with a hexagonal block.

[0017] Compared with the prior art, the technical solution provided by this invention has at least the following beneficial effects:

[0018] In the above scheme, as the anterior and posterior bone bodies grow, their overall length will change. At the same time, the slide bar and the fixation sleeve slide relative to each other through the connecting sleeve, extending the overall length and achieving co-growth with the bone. The slide bar and fixation sleeve placed in the anterior and posterior bone bodies can form the effect of an intramedullary nail, which can be used to prevent or stabilize fractures, or to correct deformities of long bones during growth, so that patients with osteogenesis imperfecta, skeletal dysplasia and other skeletal deformities can use it.

[0019] By setting a limiting mechanism, as the anterior and posterior ossicles grow, their overall length will change. At the same time, the slide bar slides forward in the fixed sleeve, causing the overall length between the slide bar and the fixed sleeve to change. When the slide bar slides forward, the limiting mechanism can effectively prevent the slide bar from shifting backward, thus avoiding the posterior ossicle from shifting backward and affecting the growth of the bones between the posterior and anterior ossicles.

[0020] By setting a fixing mechanism, when the connecting sleeve drives the fixing ring and fixing block to move forward, the fixing block drives the inclined block to move outward, so that the inclined block drives the locking block part to protrude from the peripheral wall of the fixing sleeve and embed into the anterior bone body. This can increase the pull-out resistance of the fixing sleeve and make the fixing sleeve more stably fixed to the anterior bone body through the fixing mechanism. Attached Figure Description

[0021] The accompanying drawings, which are incorporated herein and form part of the specification, illustrate embodiments of the invention and, together with the specification, further serve to explain the principles of the invention and enable those skilled in the art to practice and use the invention.

[0022] Figure 1 This is a schematic diagram of the structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the structure of the anterior and posterior bone bodies of the present invention in conjunction with each other;

[0024] Figure 3 This is a schematic diagram of the structure of the anterior bone body and the fixation sleeve of the present invention;

[0025] Figure 4 This is a schematic diagram of the mating structure of the fixing groove and the fixing sleeve of the present invention;

[0026] Figure 5 This is a schematic diagram of the threaded rod and the pointed tip mating structure of the present invention;

[0027] Figure 6 This is a schematic diagram of the structure of the fixing sleeve and the sliding rod of the present invention.

[0028] Figure 7 This is a schematic diagram of the limiting mechanism structure of the present invention;

[0029] Figure 8This is a schematic diagram of the mating structure of the fixing ring and the fixing block of the present invention;

[0030] Figure 9 This is a schematic diagram of the structure of the fixing sleeve and the locking block of the present invention.

[0031] Figure 10 This is a schematic diagram of the fixing mechanism structure of the present invention;

[0032] Figure 11 This is a schematic diagram of the structure of the rotating block and the hexagonal block of the present invention.

[0033] Figure 12 This is a schematic diagram of the connection mechanism structure of the present invention;

[0034] Figure 13 This is a schematic diagram of the screw hole and screw mating structure of the present invention;

[0035] Figure 14 For the present invention Figure 7 An enlarged diagram of A in the diagram.

[0036] [Figure Labels]

[0037] 1. Anterior bone body; 2. Posterior bone body; 3. Fixation groove; 4. Slide groove; 5. Fixation sleeve; 6. Slide rod;

[0038] 7. Limiting mechanism; 701. First groove; 702. Spring groove; 703. Spring; 704. Rotating rod; 705. Baffle; 706. Stop block; 707. Connecting ring; 708. Connecting block;

[0039] 8. Connecting sleeve;

[0040] 9. Fixing mechanism; 901. Second groove; 902. Fixing ring; 903. Fixing block; 904. Inclined surface; 905. Limiting groove; 906. Limiting block; 907. Locking block; 908. Inclined block;

[0041] 10. Limiting rod; 11. Internal thread; 12. External thread; 13. Connecting rod; 14. Rotating block; 15. Hexagonal block; 16. Threaded rod; 17. Pointed tip; 18. Hexagonal groove;

[0042] 19. Connecting mechanism; 1901. Fixed rod groove; 1902. Fixed rod; 1903. Slider; 1904. Screw hole; 1905. Screw.

[0043] As shown in the figure, specific structures and devices are marked in the figure to clearly illustrate the structure of the embodiments of the present invention. However, this is only for illustrative purposes and is not intended to limit the present invention to this specific structure, device and environment. Those skilled in the art can adjust or modify these devices and environments according to specific needs. Detailed Implementation

[0044] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. It should also be noted that, to make the embodiments more comprehensive, the following embodiments are the best and preferred embodiments, and those skilled in the art can use other alternative methods to implement some well-known technologies; moreover, the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit the present invention.

[0045] It should be noted that the use of terms such as "an embodiment," "an embodiment," "an exemplary embodiment," and "some embodiments" in the specification indicates that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments (whether explicitly described or not) should be within the knowledge of those skilled in the art.

[0046] Generally, terms can be understood at least partly from their use in context. For example, depending at least partly on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in a singular sense, or a combination of features, structures, or characteristics in a plural sense. Additionally, the term "based on" can be understood not necessarily to convey an exclusive set of factors, but rather, alternatively, depending at least partly on the context, to allow for the presence of other factors that are not necessarily explicitly described.

[0047] It is understood that the meanings of “on”, “above”, and “above” in this invention should be interpreted in the broadest manner, such that “on” means not only “directly on” something, but also includes the meaning of being “on” something with an intervening feature or layer, and that “above” or “above” means not only “on” something, but also includes the meaning of being “on” something without an intervening feature or layer.

[0048] Furthermore, spatially related terms such as “below,” “under,” “lower,” “above,” and “upper” are used herein for convenience to describe the relationship of one element or feature to one or more other elements or features, as illustrated in the accompanying drawings. Spatially related terms are intended to cover different orientations in the use or operation of the device other than those depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially related descriptive terms used herein can be interpreted similarly.

[0049] like Figures 1 to 14As shown, this embodiment of the invention provides a retractable intramedullary nail system, including an anterior bone body 1, a posterior bone body 2, and a limiting mechanism 7. The surfaces of the anterior bone body 1 and the posterior bone body 2 are provided with a fixing groove 3 and a sliding groove 4. A fixing sleeve 5 is slidably connected to the inner wall of the fixing groove 3. A sliding rod 6 is slidably connected to the inner wall of the fixing sleeve 5. A connecting sleeve 8 is slidably connected to the inner wall of one end of the fixing sleeve 5.

[0050] like Figures 5-7 As shown, the inner wall of the fixed sleeve 5 is provided with a limiting mechanism 7 to prevent the sliding rod 6 from shifting backward. The limiting mechanism 7 includes a first groove 701, a spring groove 702, a spring 703, a rotating rod 704, a baffle 705, and a stop block 706. The first groove 701 is formed inside one end of the fixed sleeve 5. Figure 14 As shown, two sets of spring grooves 702 are formed on both sides of the inner wall of the first groove 701. A spring 703 is installed inside the spring groove 702. Two sets of rotating rods 704 are rotatably connected inside the first groove 701. A baffle 705 is fixedly connected to the surface of the rotating rod 704. A stop block 706 is fixedly connected to one end of the baffle 705. One end of the spring 703 is fixedly connected to the spring groove 702, and the other end is fixedly connected to the baffle 705. Multiple sets of connecting rings 707 are rotatably connected to one end of the sliding rod 6. Two sets of connecting blocks 708 are fixedly connected to the surface of the connecting ring 707.

[0051] like Figure 2 , Figure 3 and Figure 5 As shown, one end of the slide rod 6 is fixedly connected to a connecting rod 13, and the other end is fixedly connected to a threaded rod 16, so that one end of the slide rod 6 can be fixed in the epiphysis of the posterior bone body 2 through the threaded rod 16. The connecting rod 13 is slidably connected to the inner wall of the connecting sleeve 8. One end of the threaded rod 16 is fixedly connected to a pointed tip 17, which facilitates the screwing of the slide rod 6 so that the slide rod 6 can be fixed in the epiphysis of the posterior bone body 2 through the threaded rod 16. One end of the connecting rod 13 is provided with a hexagonal groove 18, which facilitates the screwing of the connecting rod 13 and the slide rod 6 through the hexagonal groove 18 using a hexagonal rod.

[0052] like Figures 8 to 10As shown, the surface of the connecting sleeve 8 is provided with a fixing mechanism 9 for fixing the fixing sleeve 5 to the anterior bone body 1, so that the fixing sleeve 5 can be fixed on the anterior bone body 1, so that as the bone grows, the fixing sleeve 5 drives the anterior bone body 1 to move forward, and the sliding rod 6 drives the posterior bone body 2 to move forward. The fixing mechanism 9 includes a second groove 901, a fixing ring 902, a fixing block 903, an inclined surface 904, a limiting groove 905, a limiting block 906, a locking block 907, and an inclined block 908. The second groove 901 is opened inside one end of the fixing sleeve 5, and multiple sets of fixing rings 902 are rotatably connected to one end surface of the connecting sleeve 8. Two sets of fixing blocks 903 are fixedly connected to the surface of the fixing rings 902, and an inclined surface 904 is provided on one side of the fixing block 903. The inner wall of the second groove 901 has multiple sets of limiting grooves 905. The inner wall of the limiting groove 905 is slidably connected to a limiting block 906. The limiting block 906 can limit the locking block 907, so that the locking block 907 will not shake when it moves. Multiple sets of locking blocks 907 are slidably connected inside the fixing sleeve 5. One side of the locking block 907 is fixedly connected to an inclined block 908. One end of the inclined block 908 cooperates with the inclined surface 904. When the connecting sleeve 8 drives the fixing ring 902 and the fixing block 903 to move forward, the fixing block 903 drives the inclined block 908 to move outward, so that the inclined block 908 drives the locking block 907 part to protrude from the peripheral wall of the fixing sleeve 5 and embed into the anterior bone body 1. This can increase the pull-out resistance of the fixing sleeve 5, so that the fixing sleeve 5 can be fixed to the anterior bone body 1 by the fixing mechanism 9.

[0053] like Figure 10 As shown, the inner wall dimension of the limiting groove 905 matches the outer wall dimension of the limiting block 906. The limiting groove 905 is provided with a guide cavity that matches the outer contour of the limiting block 906. The inner surface of the guide cavity maintains a fitting gap of 0.05-0.2mm with the outer surface of the limiting block 906. The size of the fitting gap is configured to allow the limiting block 906 to make a reciprocating linear motion without jamming along the axial direction of the limiting groove 905. When the limiting block 906 slides inside the limiting groove 905, the limiting groove 905 can limit the sliding of the limiting block 906 and prevent the limiting block 906 from shaking inside the limiting groove 905.

[0054] like Figure 8 As shown, one end of the fixed sleeve 5 has an internal thread 11, and the surface of the connecting sleeve 8 has an external thread 12. The internal thread 11 and the external thread 12 cooperate. By twisting the connecting sleeve 8, the connecting sleeve 8 can be threadedly connected to the internal thread 11 through the external thread 12, thereby fixing the connecting sleeve 8 on the fixed sleeve 5.

[0055] like Figure 11As shown, a rotating block 14 is fixedly connected to one end of the connecting sleeve 8, and a hexagonal block 15 is fixedly connected to one end of the rotating block 14, so that the rotating block 14 can be turned by the hexagonal block 15. One end of the anterior bone 1 cooperates with the rotating block 14. When the hexagonal block 15 is turned, the rotating block 14 is threadedly connected to the anterior bone 1, and the connecting sleeve 8 can be fixed on the anterior bone 1 by the rotating block 14.

[0056] like Figure 4 As shown, the bottom of the fixed sleeve 5 is fixedly connected to the limiting rod 10, and the inner wall of the sliding groove 4 is slidably connected to the limiting rod 10.

[0057] like Figures 11 to 13 As shown, one end of the limiting rod 10 is provided with a connecting mechanism 19 for fixing the connecting sleeve 8. The connecting mechanism 19 includes a fixing rod groove 1901, a fixing rod 1902, a slider 1903, a screw hole 1904, and a screw 1905. The limiting rod 10 has a fixing rod groove 1901 at one end, and a fixing rod 1902 is slidably connected inside the fixing rod groove 1901. A slider 1903 is fixedly connected to one end of the fixing rod 1902, and the sliding groove 4 cooperates with the slider 1903. The slider 1903 has a screw hole 1904 at one end, and a screw 1905 is threaded onto the inner wall of the screw hole 1904. One end of the screw 1905 cooperates with a hexagonal block 15. When the connecting sleeve 8 is fixed to the anterior bone 1 by the rotating block 14, the slider 1903 and the fixing rod 1902 are inserted into the slide groove 4, so that the fixing rod 1902 is inserted into the fixing rod groove 1901. The screw 1905 is turned, and the screw 1905 passes through the screw hole 1904 and is threadedly connected to the internal thread of the hexagonal block 15, so that the slider 1903 is fixed in the anterior bone 1. In this way, the slider 1903 can block the slide groove 4, preventing the growth of the anterior bone 1 from blocking the slide groove 4. The slider 1903 can also fix the hexagonal block 15 by the screw 1905, so that the hexagonal block 15 cannot be turned again.

[0058] The working process of the technical solution provided by this invention is as follows:

[0059] In use, the present invention firstly involves drilling a fixing groove 3 and a sliding groove 4 into the anterior bone body 1 and the posterior bone body 2 using a drilling device, and then inserting the fixing sleeve 5 and the limiting rod 10 into the fixing groove 3 and the sliding groove 4, so that the fixing sleeve 5 and the limiting rod 10 are placed in the anterior bone body 1 and the posterior bone body 2. The limiting rod 10 prevents the fixing sleeve 5 from rotating in the anterior bone body 1 and the posterior bone body 2.

[0060] A hexagonal rod is used to screw the connecting rod 13 and the slide rod 6 through the hexagonal groove 18, so that one end of the slide rod 6 is fixed in the epiphysis of the posterior bone body 2 through the threaded rod 16. At the same time, when the slide rod 6 moves forward, it drives the connecting block 708 to move forward through the connecting ring 707. At this time, the connecting block 708 squeezes the baffle 705 and the spring 703. When the connecting block 708 passes the baffle 705, the spring 703 returns to its original position and pushes the baffle 705 and the stop block 706 to move behind the connecting block 708. At this time, the stop block 706 will block the connecting block 708, so that the slide rod 6 cannot move backward again.

[0061] Then, by turning the rotating block 14 through the hexagonal block 15, the rotating block 14 is threadedly connected to one end of the anterior bone body 1. The connecting sleeve 8 is fixed to the anterior bone body 1 through the rotating block 14. At the same time, the connecting sleeve 8 is threadedly connected to the internal thread 11 through the external thread 12, thereby fixing the connecting sleeve 8 to the fixing sleeve 5. The connecting sleeve 8 will move forward at this time. When the connecting sleeve 8 drives the fixing ring 902 and the fixing block 903 to move forward, the fixing block 903 drives the inclined block 908 to move outward. This causes the inclined block 908 to drive the locking block 907 part to protrude from the peripheral wall of the fixing sleeve 5 and embed into the anterior bone body 1, thereby increasing the pull-out resistance of the fixing sleeve 5. The fixing sleeve 5 can be fixed to the anterior bone body 1 through the fixing mechanism 9.

[0062] Next, insert the slider 1903 and the fixing rod 1902 into the groove 4, so that the fixing rod 1902 is inserted into the fixing rod groove 1901. Tighten the screw 1905, which passes through the screw hole 1904 and is threadedly connected to the hexagonal block 15, thus fixing the slider 1903 in the anterior bone 1. In this way, the slider 1903 can block the groove 4, preventing the growth of the anterior bone 1 from blocking the groove 4. The slider 1903 can also fix the hexagonal block 15 through the screw 1905, so that the hexagonal block... 15 cannot be turned again. After the slide rod 6 and the fixing sleeve 5 are fixed, as the bone grows, the slide rod 6 and the fixing sleeve 5 slide relative to each other through the connecting sleeve 8 and extend the overall length, so as to grow together with the bone. This can effectively prevent or stabilize fractures, or correct deformities of long bones during growth. When the slide rod 6 slides forward, the limiting mechanism 7 can effectively prevent the slide rod 6 from falling back, avoid the posterior bone body 2 from moving backward, and avoid affecting the growth of the bone between the posterior bone body 2 and the anterior bone body 1.

[0063] This invention encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of this invention. To provide the public with a thorough understanding of this invention, specific details are described in detail in the following preferred embodiments; however, those skilled in the art will fully understand the invention even without these details. Furthermore, to avoid unnecessary misunderstanding of the essence of this invention, well-known methods, processes, procedures, components, and circuits are not described in detail.

[0064] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A retractable intramedullary nail system, characterized in that, It includes an anterior bone body, a posterior bone body, and a limiting mechanism. The surfaces of the anterior bone body and the posterior bone body are provided with a fixing groove and a sliding groove. A fixing sleeve is slidably connected to the inner wall of the fixing groove. A sliding rod is slidably connected to the inner wall of the fixing sleeve. A connecting sleeve is slidably connected to the inner wall of one end of the fixing sleeve. The inner wall of the fixing sleeve is provided with a limiting mechanism, the limiting mechanism includes a first groove, one end of the fixing sleeve is provided with the first groove, two sets of spring grooves are provided on both sides of the inner wall of the first groove, a spring is provided inside the spring groove, two sets of rotating rods are rotatably connected inside the first groove, a baffle is fixedly connected to the surface of the rotating rod, a stop block is fixedly connected to one end of the baffle, a spring groove is fixedly connected to one end of the spring, and a baffle is fixedly connected to the other end. The surface of the connecting sleeve is provided with a fixing mechanism for fixing the fixing sleeve to the anterior bone body. The fixing mechanism includes a second groove, a fixing ring, a fixing block, an inclined surface, a limiting groove, a limiting block, a locking block, and an inclined block. The second groove is formed inside one end of the fixing sleeve. Multiple sets of fixing rings are rotatably connected to one end of the connecting sleeve. Two sets of fixing blocks are fixedly connected to the surface of the fixing rings. An inclined surface is provided on one side of the fixing block. Multiple sets of limiting grooves are formed on the inner wall of the second groove. Limiting blocks are slidably connected to the inner wall of the limiting grooves. A locking block is fixedly connected to the surface of the limiting block. Multiple sets of locking blocks are slidably connected inside the fixing sleeve. An inclined block is fixedly connected to one side of the locking block. One end of the inclined block cooperates with the inclined surface.

2. The retractable intramedullary nail system according to claim 1, characterized in that, One end of the slide rod is rotatably connected to multiple sets of connecting rings, and two sets of connecting blocks are fixedly connected to the surface of the connecting rings.

3. The retractable intramedullary nail system according to claim 1, characterized in that, One end of the slide rod is fixedly connected to a connecting rod, and the other end is fixedly connected to a threaded rod. The inner wall of the connecting sleeve is slidably connected to the connecting rod.

4. The retractable intramedullary nail system according to claim 3, characterized in that, One end of the threaded rod is fixedly connected to a pointed tip, and one end of the connecting rod is provided with a hexagonal groove.

5. The retractable intramedullary nail system according to claim 4, characterized in that, The limiting groove is provided with a guide cavity that matches the outer contour of the limiting block. The inner surface of the guide cavity and the outer surface of the limiting block maintain a fitting gap of 0.05-0.2mm. The size of the fitting gap is configured to allow the limiting block to make reciprocating linear motion without jamming along the axial direction of the limiting groove.

6. The retractable intramedullary nail system according to claim 1, characterized in that, The fixed sleeve has an internal thread at one end, and the connecting sleeve has an external thread on its surface. The internal thread and the external thread are engaged.

7. The retractable intramedullary nail system according to claim 1, characterized in that, One end of the connecting sleeve is fixedly connected to a rotating block, and one end of the rotating block is fixedly connected to a hexagonal block. One end of the anterior bone body is engaged with the rotating block.

8. The retractable intramedullary nail system according to claim 1, characterized in that, A limiting rod is fixedly connected to the bottom of the fixed sleeve, and a limiting rod is slidably connected to the inner wall of the sliding groove.

9. The retractable intramedullary nail system according to claim 8, characterized in that, One end of the limiting rod is provided with a connecting mechanism, the connecting mechanism includes a fixing rod groove, one end of the limiting rod is provided with a fixing rod groove, a fixing rod is slidably connected inside the fixing rod groove, one end of the fixing rod is fixedly connected with a slider, the sliding groove cooperates with the slider, one end of the slider is provided with a screw hole, the inner wall of the screw hole is threaded with a screw, and one end of the screw cooperates with a hexagonal block.

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