Fixing device for calcaneal fracture

Abstract

The invention discloses a fixing device for calcaneal fracture, and relates to the technical field of calcaneal fracture treatment, the fixing device comprises a first bone fracture plate, a second bone fracture plate, an adjusting assembly and a fixing assembly, the middle of the first bone fracture plate is provided with a space for installing a non-locking screw, the second bone fracture plate is arranged on one side of the first bone fracture plate, and a user can adjust the angle of the first bone fracture plate conveniently through the second bone fracture plate; the device is arranged between a first bone fracture plate and a second bone fracture plate, the inclination angle of the first bone fracture plate is finely adjusted through cooperation of an arc-shaped rack and a circular gear which are arranged on one side of the first bone fracture plate, and therefore a transmission rod and the circular gear are driven to rotate at the top of the second bone fracture plate at the same time; the fibroblast growth factors in the non-locking screw flow to the bottom face of the non-locking screw through the multiple flowing holes and the through grooves, then flow out of the bottom face of the non-locking screw and make contact with the calcaneus through the non-locking screw, the fibroblast growth factors are angiogenesis and cell proliferation promoting factors, and acceleration is provided for cell repair activity.

Description

Technical Field

[0001] This invention relates to the field of calcaneal fracture technology, specifically to a fixation device for calcaneal fractures. Background Technology

[0002] The calcaneus is the largest tarsal bone in the human body. Fractures of the calcaneus are usually caused by high-energy injuries (such as falls from heights or car accidents), and are mostly intra-articular comminuted fractures. As a result, the joint surface becomes uneven, leading to abnormal wear and tear of the articular cartilage during activity, causing inflammation and pain, and often accompanied by traumatic arthritis. Changes in the shape of the calcaneus can affect the force line of the entire foot, leading to weakened Achilles tendon strength, abnormal gait, and may secondary to pain in the ankle, knee, and even hip and lower back. Therefore, it is necessary to use fixation devices to treat the fractured part of the calcaneus in a timely manner. Most often, a bone plate is used to treat the fractured part.

[0003] However, the existing fixing devices are not perfect and still have certain defects: Bone plates can generate pressure between fracture lines, ensuring close contact between the fracture ends. This not only increases stability but also stimulates healing, allowing patients to regain limb function and return to normal life as soon as possible. However, the extent of calcaneal fractures varies from patient to patient. Because bone plates are fixed in one piece and cannot be fine-tuned, they may not fully conform to the injured area. Consequently, the non-locking screws installed on the bone plate cannot be precisely driven into the injured area, affecting the quality of bone healing. Without bio-stimulation, the bone ingrowth into the screw threads is slow and passive. The insertion of non-locking screws is purely mechanical; in osteoporotic areas, this mechanical holding force is insufficient. For fractures with severely impaired blood supply, the lack of bio-stimulation may halt the healing process, affecting healing. The grooves on the bone plate surface can only lock the screws in specific positions. The screws must be driven in the pre-set direction of the plate holes, which may prevent precise driving into critical small bone fragments, thus reducing the holding force of the fixation, weakening the flexibility of the fixation device, and reducing the effectiveness of calcaneal fracture treatment. Summary of the Invention

[0004] The purpose of this invention is to provide a fixation device for calcaneal fractures to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a fixation device for calcaneal fractures, comprising; The first bone plate has a space in the middle for installing non-locking screws; The second bone plate is located on one side of the first bone plate, and the second bone plate makes it easier for the user to adjust the angle of the first bone plate. An adjustment component is disposed between the first bone plate and the second bone plate, and the tilt angle of the first bone plate is finely adjusted by the cooperation of an arc-shaped rack and a circular gear disposed on one side of the first bone plate. The pressing component, located inside the non-locking screw, allows fibroblast growth factor to flow out and reach the calcaneal fracture area through the screw, thereby accelerating cell proliferation and promoting new blood vessel ingrowth into the fracture area. A horizontal displacement assembly, located inside the first bone plate, is used to laterally adjust the position of two of the non-locking screws, enabling fixation according to the area of ​​the calcaneal fracture. The puncture component, located inside the second bone plate, uses positional changes to force fibroblast growth factors out of the second bone plate and continue to be transported to the calcaneal surface through grooves opened on the inner bottom surface of the second bone plate, providing a rich blood supply for new bone formation. The adjustment assembly also includes an arc-shaped rack. A transmission rod is provided on the top of the second bone plate. A circular gear is sleeved on one end of the transmission rod. An adjustment groove is opened on the surface of the second bone plate. A positioning rod is movably installed inside the adjustment groove. A support rod is inserted and connected to the top of the first bone plate. The positioning rod and the support rod are connected by a support plate. When the user rotates the first bone plate left and right, the arc-shaped rack rotates accordingly. The meshing of the circular gear and the arc-shaped rack causes the transmission rod to rotate inside the second bone plate. With the connection of the support plate, the positioning rod rotates slightly inside the adjustment groove. The pressing component includes: A through groove is provided, which is connected to a non-locking screw, and a limiting collar is provided inside the through groove. The middle part of the limiting collar is provided with a cylindrical capsule for storing fibroblast growth factors. The pusher is movably installed inside the through groove, and a piercing needle is provided at its bottom; The contact head, located at the top of the cylindrical capsule, is made of collagen, which is biocompatible and bioactive, and can support cell adhesion and tissue growth. Flow holes, evenly spaced, are formed on the top of the limiting ring to carry fibroblast growth factors; The horizontal displacement component includes four embedded strips, which are symmetrically distributed inside the first bone plate with respect to the center point. Each of the four embedded strips has a fitting block fitted at one end, and an extension plate is provided between the inner walls of two adjacent fitting blocks. Two convex plates are symmetrically arranged on the top of the two extension plates, and their configuration is to allow the horizontal displacement component to move horizontally. Two anti-dislocation blocks are provided, one at the bottom of each of the two extension plates. A round sleeve is provided at the top of each of the two anti-dislocation blocks to enhance the stability of the non-locking screw after insertion into the calcaneus. The concave holes are respectively opened on the top of the first bone plate, and the top of the four convex plates are provided with limit bolts, which are threadedly connected to the concave holes. The puncture component includes a circular capsule, and a receiving groove is formed on the inner surface of the second bone plate. The circular capsule is filled inside the receiving groove. Fibroblast growth factor is injected into the interior of the circular capsule, and the material of the circular capsule is collagen, which has biocompatibility and bioactivity and can support cell adhesion and tissue growth. The receiving trough is interconnected with the interior of the second bone plate. The fibroblast growth factor inside the circular capsule can be smoothly guided to the surface of the calcaneal fracture along the interconnected area. Fibroblast growth factor is an angiogenic agent that can accelerate cell proliferation and improve the efficiency of calcaneal fracture healing.

[0006] Preferably, the puncture component includes a follower, which is disposed on one side of the positioning rod. A fixing sleeve is fitted over the follower, and a conical microneedle is fixedly installed on one side of the fixing sleeve. The conical microneedle is disposed on one side of the circular capsule, and both the conical microneedle and the puncture needle are made of polylactic acid-glycolic acid copolymer microfiber. The conical microneedle and the puncture needle are reinforced on the surfaces of the fixing sleeve and the pusher respectively by 3D printing. Polylactic acid-glycolic acid copolymer microfiber is a biodegradable polymer material that can serve as a robust temporary scaffold to maintain the spatial structure in the early stage of fracture healing. In the middle stage, its degradation rate enables the release of encapsulated growth factors, promoting fracture healing.

[0007] Preferably, the surface of the second bone plate is provided with an arc-shaped wrapping plate, the height of which is higher than the height of the support plate. The top surface of the second bone plate is provided with a reinforcing groove for the installation of non-locking screws. The top surface of the first bone plate is provided with multiple threaded holes, and the non-locking screws are installed in the threaded holes.

[0008] Compared with the prior art, the beneficial effects of the present invention are: In this invention, through the coordinated use of an arc-shaped rack, a transmission rod, a circular gear, an adjusting groove, and a positioning rod, when the user rotates the first bone plate left and right, the arc-shaped rack rotates synchronously. Due to the meshing connection between the arc-shaped rack and the circular gear, the transmission rod and the circular gear rotate simultaneously on the top of the second bone plate. The support rod is fixedly inserted inside the first bone plate, and both sides of the support plate are fixed to the support rod and the positioning rod, respectively. Therefore, the rotation of the arc-shaped rack drives the positioning rod to rotate inside the adjusting groove, thereby adjusting the angle of the first bone plate. The adjustment range is small and will not affect the stability of the first and second bone plates. At this time, the bottom surfaces of the first and second bone plates are at the same level, which is to ensure that both are always tightly fitted to the patient's fracture surface, avoiding gaps that could lead to non-locking. The uneven stress on the fixed screw improves the stability of the overall fixation structure. Through the coordinated use of the through groove, pusher, puncture needle, cylindrical capsule, limiting collar, contact head, and flow holes, the cylindrical capsule is first inserted into the through groove. The contact head is then engaged with the limiting collar, which clamps the capsule. The user uses a small pin to push the pusher, and the puncture needle continues to move downwards. When the tip of the puncture needle contacts the surface of the contact head, the surface breaks, allowing fibroblast growth factor to flow through multiple flow holes and the through groove to the bottom of the non-locking screw. It then flows out from the bottom of the non-locking screw and contacts the calcaneus. Fibroblast growth factor is a pro-angiogenic and pro-cell proliferation factor, accelerating cell repair activity and thus promoting healing.

[0009] In this invention, a horizontal displacement component allows the user to sequentially pull the anti-dislocation blocks, transferring this force to the extension plate. The fitting block moves at one end of the embedding strip, thereby adjusting the distance between the anti-dislocation blocks on both sides. One end of the limiting bolt is embedded into the corresponding recessed hole, and the two are threaded together, thus limiting and fixing the first bone plate and the anti-dislocation blocks, ensuring their stability. This structure allows the position of the first bone plate to be adjusted according to the area of ​​the patient's calcaneal fracture, ensuring that both the first and second bone plates fully conform to the injured area, and subsequent non-locking... The fixed screw can be precisely inserted into the injured area, improving the quality of bone setting. Through the designed puncture component, the fibroblast growth factor stored inside the circular capsule can be transported to the surface of the calcaneus, promoting bone healing. As the positioning rod rotates, it drives the conical microneedle to rotate. After the conical microneedle squeezes and punctures the circular capsule, the fibroblast growth factor stored inside slowly flows out. Under the action of inertia, the fibroblast growth factor flows down along the inner wall of the receiving groove and the second bone plate, and then gradually comes into contact with the surface of the calcaneus, providing biostimulation to the fracture surface of the calcaneus and accelerating the healing speed. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the main structure of a fixation device for calcaneal fractures according to the present invention; Figure 2 This is a partial internal cross-sectional view of the non-locking screw in a fixation device for calcaneal fractures according to the present invention. Figure 3 This invention relates to a fixation device for calcaneal fractures. Figure 2 A magnified structural diagram at point A; Figure 4 This is a schematic diagram of the adjustment component in a fixation device for calcaneal fractures according to the present invention; Figure 5 This invention relates to a fixation device for calcaneal fractures. Figure 4 An enlarged structural diagram at point B; Figure 6 This is a schematic diagram of the horizontal displacement component in a fixation device for calcaneal fractures according to the present invention; Figure 7 This is a schematic diagram of a partial bottom view of a fixation device for calcaneal fractures according to the present invention; Figure 8 This invention relates to a fixation device for calcaneal fractures. Figure 7 An enlarged structural diagram at point C; Figure 9 This invention relates to a fixation device for calcaneal fractures. Figure 6 An enlarged structural diagram at point D; Figure 10 This is a longitudinal cross-sectional view of a non-locking screw in a fixation device for calcaneal fractures according to the present invention. Figure 11 This invention relates to a fixation device for calcaneal fractures. Figure 10 An enlarged structural diagram at point E.

[0011] In the diagram: 1. Adjustment component; 2. Pressing component; 3. Horizontal displacement component; 4. Puncture component; 100. First bone plate; 101. Arc-shaped rack; 102. Transmission rod; 103. Circular gear; 104. Adjustment groove; 105. Positioning rod; 106. Support rod; 107. Support plate; 200. Second bone plate; 201. Through groove; 202. Pushing component; 203. Puncture needle; 204. Cylindrical capsule; 205. Limiting collar; 20 6. Contact head; 207. Flow hole; 300. Non-locking screw; 301. Embedding strip; 302. Adhesive block; 303. Extension plate; 304. Circular sleeve; 305. Anti-misalignment block; 306. Protruding plate; 307. Concave hole; 308. Limiting bolt; 400. Arc-shaped wrapping plate; 401. Receiving groove; 402. Circular capsule; 403. Follower; 404. Fixing sleeve; 405. Conical microneedle; 500. Reinforcing groove; 600. Threaded hole. Detailed Implementation

[0012] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0013] To address the issues of insufficient mechanical holding force in osteoporotic areas and the potential for stunted healing due to lack of biostimulation in fractures with severely impaired blood supply, this invention provides a fixation device for calcaneal fractures, referring to... Figure 1 , Figure 2 and Figure 3 As shown: It includes a first bone plate 100, with a space in the middle for installing a non-locking screw 300; The second bone plate 200 is disposed on one side of the first bone plate 100, and the user can easily adjust the angle of the first bone plate 100 through the second bone plate 200. Adjustment component 1 is disposed between the first bone plate 100 and the second bone plate 200. The tilt angle of the first bone plate 100 is finely adjusted by the cooperation of the arc-shaped rack 101 and the circular gear 103 disposed on one side of the first bone plate 100. The pressing component 2, which is located inside the non-locking screw 300, is used to allow the fibroblast growth factor inside to flow out and reach the calcaneal fracture area through the non-locking screw 300, thereby accelerating cell proliferation and promoting the ingrowth of new blood vessels into the fracture area. The horizontal displacement component 3 is located inside the first bone plate 100 and is used to adjust the position of two non-locking screws 300 laterally, so as to fix them according to the area of ​​the calcaneal fracture. The puncture component 4, located inside the second bone plate 200, uses positional changes to force fibroblast growth factors out of the second bone plate 200 and continue to be transported to the calcaneal surface through a groove opened on the bottom surface of the second bone plate 200, providing a rich blood supply for new bone formation. The first bone plate 100 and the second bone plate 200 of this invention are initially positioned close to the injured surface of the patient's calcaneal fracture. The bottom surfaces of the first bone plate 100 and the second bone plate 200 are tightly fitted to the fracture surface. Since the bottom surfaces of the first bone plate 100 and the second bone plate 200 are on the same horizontal plane, there are no gaps between their bottom surfaces and the fracture surface, greatly reducing the risk of difficulty in reduction due to misalignment. The horizontal plane of the two plates solves the problem of uneven stress on the non-locking screws 300, improving the stability of multiple non-locking screws 300 installed between the first bone plate 100 and the second bone plate 200. Subsequently, the length of the fracture is carefully observed to facilitate subsequent adjustment of the positions of the two anti-misalignment blocks 305. The first bone plate 100, the second bone plate 200, and the arc-shaped wrapping plate 400 are also included. Both plates are made of titanium alloy, whose elastic modulus is relatively close to that of bone, which can reduce the "stress shielding" effect, i.e., the bone underneath becomes porous due to lack of stress caused by excessive strength of the steel plate. In addition, it is non-magnetic and does not affect subsequent examinations. The surfaces of the first bone plate 100 and the second bone plate 200 are often sandblasted and coated to facilitate bone tissue ingrowth and achieve better integration. The two plates act as an internal scaffold, and the repositioned bone fragments are firmly fixed together by non-locking screws 300 to prevent them from shifting again. The first bone plate 100 and the second bone plate 200 eliminate abnormal movement at the fracture ends, providing a perfect "resting" environment for bone cell ingrowth and the formation of new bone callus. Stable fixation allows the joints near the affected area to perform non-weight-bearing activities in the early stages, effectively preventing joint stiffness and muscle atrophy.

[0014] Preferably, the specific operating process of adjusting component 1 is based on... Figure 1 and Figure 4 As shown, the adjustment assembly 1 also includes an arc-shaped rack 101. A transmission rod 102 is provided on the top of the second bone plate 200. A circular gear 103 is sleeved on one end of the transmission rod 102. An adjustment groove 104 is opened on the surface of the second bone plate 200. A positioning rod 105 is movably installed inside the adjustment groove 104. A support rod 106 is inserted and connected to the top of the first bone plate 100. The positioning rod 105 and the support rod 106 are connected by a support plate 107. When the user rotates the first bone plate 100 left and right, the arc-shaped rack 101 rotates accordingly. The meshing of the circular gear 103 and the arc-shaped rack 101 causes the transmission rod 102 to rotate inside the second bone plate 200. With the connection of the support plate 107, the positioning rod 105 rotates slightly inside the adjustment groove 104.

[0015] First, medical staff used a scalpel to pry open the skin, exposing the fractured area of ​​the calcaneus. Then, they cleaned the skin and bone, observing the extent of the fracture. The medical staff then proceeded to piece together the fracture. Figure 1 The collapsed articular surface was pried up to restore the normal shape of the calcaneus. The surfaces of the first bone plate 100 and the second bone plate 200 were sandblasted and coated beforehand to facilitate bone tissue ingrowth and achieve better integration. The selected anatomical first bone plate 100 and the second bone plate 200 were attached to the lateral wall of the calcaneus. A drill was used to drill guide holes in the bone through the holes on the surfaces of the first bone plate 100 and the second bone plate 200. A tap was used to tap the threads in the hard cortical bone. Finally, a screwdriver was used to screw the non-locking screw 300 into the hole. The threaded head of the non-locking screw 300 would lock firmly with the threads on the bone to form a strong "internal fixation frame". After confirming that the reduction and fixation were satisfactory, a drainage tube was placed and the incision was sutured layer by layer.

[0016] When the user rotates the first bone plate 100 left and right, it first drives the arc-shaped rack 101 to rotate synchronously. Due to the meshing connection between the arc-shaped rack 101 and the circular gear 103, the transmission rod 102 and the circular gear 103 are driven to rotate simultaneously on the top of the second bone plate 200. The support rod 106 is fixedly inserted inside the first bone plate 100, and the two sides of the support plate 107 are fixed to the support rod 106 and the positioning rod 105 respectively. Therefore, under the rotation of the arc-shaped rack 101, the positioning rod 105 is driven to rotate inside the adjustment groove 104, thereby adjusting the angle of the first bone plate 100. The adjustment range of this angle is small and will not affect the stability of the first bone plate 100 and the second bone plate 200. The meshing connection between the arc-shaped rack 101 and the circular gear 103 allows the first bone plate 100 to rotate slightly, which applies beneficial micro-stress to the fracture ends, significantly stimulating callus shaping and remodeling, accelerating healing, and preventing osteoporosis.

[0017] It is important to note that both the arc-shaped rack 101 and the circular gear 103 used are made of polyetheretherketone (PEEK), a biodegradable polymer composite material. This material maintains sufficient mechanical strength during the critical period of fracture healing in the first 6-8 weeks after implantation, enabling precise transmission of modulating forces. As the fracture begins to heal, the stress is gradually borne by the bone, and the material begins to slowly degrade and is completely absorbed by the body in about a year. Ultimately, the mechanical structure disappears, avoiding the long-term stress shielding, corrosion, and irritation risks associated with permanent metal implants. Both feature a miniaturized modular design, which greatly reduces the impact on the overall thickness and strength of the connecting bone plate.

[0018] Preferably, the specific operating process of the pressing component 2 is based on... Figure 2 and Figure 3 As shown, the pressing component 2 includes: The through groove 201 is connected to the non-locking screw 300, and the through groove 201 is provided with a limiting collar 205. The middle part of the limiting collar 205 is provided with a cylindrical capsule 204 for storing fibroblast growth factors. The pusher 202 is movably installed inside the through groove 201, and a piercing needle 203 is provided at its bottom; The contact head 206 is located at the top of the cylindrical capsule 204. It is made of collagen, which is biocompatible and bioactive, and can support cell adhesion and tissue growth. Flow holes 207 are equally spaced on the top of the limiting ring 205 and are used to carry fibroblast growth factors.

[0019] like Figure 10 and Figure 11 As shown, after the first bone plate 100 and the second bone plate 200 are attached to the bone surface at the fracture site, firstly, using a drill bit matching the diameter of the non-locking screw 300, a smooth guide hole is drilled in the bone through the plate hole. This step determines the screw path. The drill bit is then removed, and a depth gauge is inserted into the hole to measure the required length of the non-locking screw 300. Because the bone is very hard, an internal thread needs to be cut in this smooth guide hole using a tap. The selected length of the non-locking screw 300 is placed on the screwdriver bit. The non-locking screw 300 is aligned with the threaded hole 600 on the surface of the first bone plate 100 and the reinforcing groove 500 on the surface of the second bone plate 200, ensuring that its front thread aligns with the pre-taped thread on the bone. The screwdriver is started and rotated clockwise. The self-tapping thread at the front of the non-locking screw 300 easily "engages" with the pre-cut bone thread, advancing smoothly. When the non-locking screw 300 is tightened, its thread tail will engage with the first bone plate 100. The threads inside the second bone plate 200 are tightly screwed in and locked, providing angular stability. The non-locking screw 300 and the first bone plate 100 are locked together with the second bone plate 200 into a robust unit. First, the cylindrical capsule 204 is inserted into the through groove 201. The contact head 206 is precisely engaged with the limiting collar 205, which clamps the cylindrical capsule 204. The user uses a small-sized ejector pin to push the pusher 202 and the puncture needle 2. 03 Continue moving downwards. When the tip of the puncture needle 203 contacts the surface of the contact head 206, the surface of the contact head 206 is damaged. The internal fibroblast growth factor flows through multiple flow holes 207 and through grooves 201 to the bottom surface of the non-locking screw 300, and then flows out from the bottom surface of the non-locking screw 300. It contacts the calcaneus through the non-locking screw 300. Fibroblast growth factor is a pro-angiogenic and pro-cell proliferation factor, which accelerates cell repair activities and thus promotes healing.

[0020] It should be noted that the contact head 206 is made of collagen, which is biocompatible and bioactive, and can support cell adhesion and tissue growth. The flow hole 207 is used to carry fibroblast growth factors.

[0021] Preferably, the specific operating process of the horizontal displacement component 3 is based on... Figure 6 , Figure 7 and Figure 9 As shown, the horizontal displacement component 3 includes four embedded strips 301. The four embedded strips 301 are symmetrically distributed inside the first bone plate 100 with respect to the center point. One end of each of the four embedded strips 301 is fitted with a fitting block 302. An extension plate 303 is provided between the inner walls of two adjacent fitting blocks 302. There are two protruding plates 306, which are symmetrically arranged on the top of the two extension plates 303, and are configured to make the horizontal displacement component 3 move horizontally. There are two anti-dislocation blocks 305, which are respectively located at the bottom of the two extension plates 303. The top of each anti-dislocation block 305 is provided with a round sleeve 304 to enhance the stability of the non-locking screw 300 after it is inserted into the calcaneus. The concave holes 307 are respectively opened on the top of the first bone plate 100, and the top of the four protruding plates 306 are all provided with limit bolts 308, which are threadedly connected to the concave holes 307.

[0022] Two anti-dislocation blocks 305 are respectively installed on both sides of the top of the first bone plate 100. Both can move horizontally within their respective sections, allowing adjustment of their distance according to the extent of the calcaneal fracture, thus improving the flexibility of the fixation device. The user pulls the anti-dislocation blocks 305 sequentially, transmitting this force to the extension plate 303. The fitting block 302 moves at one end of the insert strip 301, thereby adjusting the distance between the two anti-dislocation blocks 305. One end of the limiting bolt 308 is inserted into the corresponding recess 307, and the two are threaded together. The first bone plate 100 and the anti-dislocation block 305 can be limited and fixed, ensuring their stability. This structure allows the position of the first bone plate 100 to be adjusted according to the area of ​​the patient's calcaneal fracture, so that the first bone plate 100 and the second bone plate 200 can fully fit the injured area. Subsequently, the non-locking screw 300 can be accurately driven into the injured area, improving the quality of bone setting. The first bone plate 100 and the round sleeve 304 are limited and fixed mainly by two limiting bolts 308, and the limiting bolts 308 are rotated by a matching screwdriver.

[0023] Preferably, the specific operation process of puncturing component 4 is based on Figure 5 and Figure 8As shown, the puncture component 4 includes a circular capsule 402. A receiving groove 401 is formed on the inner surface of the second bone plate 200. The circular capsule 402 is filled inside the receiving groove 401. The circular capsule 402 is injected with fibroblast growth factor and is made of collagen, possessing biocompatibility and bioactivity, supporting cell adhesion and tissue growth. The receiving groove 401 is interconnected with the interior of the second bone plate 200, allowing the fibroblast growth factor inside the circular capsule 402 to flow smoothly along the interconnected area to the calcaneal fracture surface. Fibroblast growth factor is an angiogenic agent that accelerates cell proliferation and improves the efficiency of calcaneal fracture healing. The puncture component 4 also includes a follower 403. The follower 403 is located on one side of the positioning rod 105. A fixing sleeve 404 is fitted around the follower 403. A conical microneedle 405 is fixedly installed on one side of the fixing sleeve 404. The conical microneedle 405 is located on one side of the circular capsule 402. Both the conical microneedle 405 and the puncture needle 203 are made of polylactic acid-glycolic acid copolymer microfiber. The conical microneedle 405 and the puncture needle 203 are reinforced on the surface of the fixing sleeve 404 and the pusher 202 respectively by 3D printing. Polylactic acid-glycolic acid copolymer microfiber is a biodegradable polymer material that can serve as a strong temporary support to maintain the spatial structure in the early stage of fracture healing. In the middle stage, its degradation rate enables the release of encapsulated growth factors, promoting fracture healing.

[0024] The puncture component 4 allows the fibroblast growth factor stored inside the circular capsule 402 to be transported to the calcaneal surface, promoting bone healing. As the positioning rod 105 rotates, it drives the conical microneedle 405 to rotate. After the conical microneedle 405 punctures the circular capsule 402, the fibroblast growth factor stored inside slowly flows out. Under the action of inertia, the fibroblast growth factor flows downward along the inner wall of the receiving groove 401 and the second bone plate 200, and then gradually contacts the calcaneal surface, providing biostimulation to the calcaneal fracture surface and accelerating the healing speed.

[0025] Working Principle: The calcaneus is the largest tarsal bone in the human body. Fractures of the calcaneus are usually caused by high-energy injuries such as falls from heights or car accidents, and are often intra-articular comminuted fractures. This results in uneven joint surfaces, leading to abnormal wear and tear of the articular cartilage during activity, causing inflammation and pain, and is often accompanied by traumatic arthritis. Changes in the calcaneus shape affect the force alignment of the entire foot, leading to weakened Achilles tendon strength, abnormal gait, and potentially secondary pain in the ankle, knee, and even hip and lower back. Therefore, timely treatment with fixation devices is necessary for calcaneal fractures. Most commonly, bone plates are used to treat the fractured area. The bone plate can generate pressure between the fracture lines, ensuring close contact between the fracture ends. This not only increases stability but also stimulates healing, allowing patients to regain limb function and return to normal life as soon as possible. The extent of calcaneal fractures varies from patient to patient. Because the bone plate is a one-piece fixed installation, it cannot be finely adjusted in angle, which can lead to the bone plate not fully conforming to the injured area. Subsequent bone plate placement... The installation of non-locking screws cannot be precisely driven into the injured area, affecting the quality of bone setting. Without bioactive stimulation, the bone ingrowth into the screw threads is slow and passive. The insertion of non-locking screws is purely mechanical; in osteoporotic areas, the mechanical holding force is insufficient. For fractures with severely impaired blood supply, the lack of biostimulation may cause the healing process to stall, affecting healing. The grooves on the bone plate surface can only lock the screw in a specific position; the screw must be driven in along the pre-set direction of the plate holes, which may prevent precise driving into the bone areas of some critical small bone fragments, thus reducing the holding force of fixation, weakening the flexibility of the fixation device, and reducing the effectiveness of calcaneal fracture treatment. Therefore, a fixation device needs to be designed to solve the above-mentioned technical problems. Medical staff need to cut the skin, carefully peel and lift the skin flap to expose the comminuted fracture area on the lateral side of the calcaneus, then clean the epidermis and bone, and observe the fracture area. Medical staff then work like piecing together... Figure 1The collapsed articular surface is pried up to restore the normal shape of the calcaneus. The surfaces of the first bone plate 100 and the second bone plate 200 have been sandblasted and coated beforehand to facilitate bone ingrowth and better integration. The selected anatomically shaped first bone plate 100 and second bone plate 200 are attached to the lateral wall of the calcaneus. A drill bit is used to drill guide holes in the bone through the holes on the surfaces of the first bone plate 100 and the second bone plate 200. A tap is used to create threads in the hard cortical bone. When the user rotates the first bone plate 100 left and right, it first drives the arc-shaped rack 101 to rotate synchronously. Due to the meshing connection between the arc-shaped rack 101 and the circular gear 103, the transmission rod is driven. 102 and the circular gear 103 rotate simultaneously on the top of the second bone plate 200. The support rod 106 is fixedly inserted inside the first bone plate 100, and the two sides of the support plate 107 are respectively fixed to the support rod 106 and the positioning rod 105. Therefore, under the rotation of the arc-shaped rack 101, the positioning rod 105 is driven to rotate inside the adjustment groove 104, thereby adjusting the angle of the first bone plate 100, so that the first bone plate 100 and the second bone plate 200 make more comprehensive contact with the fractured part, and the adjustment range of this angle is small, so as not to affect the stability of the first bone plate 100 and the second bone plate 200. The non-locking screw 300 is screwed into the hole with a screwdriver. The thread of the non-locking screw 300 The head is firmly locked to the threads on the bone, forming an internal fixation bracket. The cylindrical capsule 204 is inserted into the through groove 201. This is achieved when the non-locking screw 300 is locked to the threads on the bone. The contact head 206 is precisely engaged with the limiting collar 205, which clamps the cylindrical capsule 204. The user uses a small-sized push pin to push the pusher 202, and the puncture needle 203 continues to move downward. When the end of the puncture needle 203 contacts the surface of the contact head 206, the surface of the contact head 206 is damaged, and the internal fibroblast growth factor flows through multiple flow holes 207 and the through groove 201 to the bottom surface of the non-locking screw 300. The material then flows out from the bottom of the non-locking screw 300 and contacts the calcaneus through the non-locking screw 300. Fibroblast growth factor is a pro-angiogenic and pro-cell proliferation factor that accelerates cell repair activities, thereby promoting healing. The material inside the through groove 201 is polylactic acid-glycolic acid copolymer microfiber, a biodegradable polymer material. Two anti-dislocation blocks 305 are respectively installed on both sides of the top of the first bone plate 100. Both can move horizontally inside them. By moving horizontally, their distance can be adjusted, which can be adjusted according to the extent of the calcaneal fracture, improving the flexibility of the fixation device. The user pulls the anti-dislocation blocks 305 in sequence, transmitting this force to the extension plate 303.The fitting block 302 moves at one end of the embedding strip 301, thereby adjusting the distance between the anti-dislocation blocks 305 on both sides. One end of the limiting bolt 308 is embedded into the corresponding recess 307, and the two are threaded together, thus limiting and fixing the first bone plate 100 and the anti-dislocation block 305, ensuring their stability. This structure allows the position of the first bone plate 100 to be adjusted according to the area of ​​the patient's calcaneal fracture, so that the first bone plate 100 and the second bone plate 200 can fully fit the injured area. Subsequently, the non-locking screw 300 can be accurately driven into the injured area, improving the quality of bone setting. The first bone setting is mainly achieved by using two limiting bolts 308. The plate 100 and the circular sleeve 304 are positioned and fixed, while the limiting bolt 308 is rotated using a matching screwdriver. Through the piercing component 4, the fibroblast growth factor stored inside the circular capsule 402 can be transported to the calcaneal surface, promoting bone healing. As the positioning rod 105 rotates, it drives the conical microneedle 405 to rotate. After the conical microneedle 405 punctures the circular capsule 402, the fibroblast growth factor stored inside slowly flows out. Under the action of inertia, the fibroblast growth factor flows downward along the inner wall of the receiving groove 401 and the second bone plate 200, and then gradually contacts the calcaneal surface, providing biostimulation to the calcaneal fracture surface and accelerating the healing speed.

[0026] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A fixation device for calcaneal fractures, characterized in that, include: The first bone plate (100) has a space in the middle for installing a non-locking screw (300); The second bone plate (200) is located on one side of the first bone plate (100), and the second bone plate (200) facilitates the user to adjust the angle of the first bone plate (100); The adjustment component (1) is disposed between the first bone plate (100) and the second bone plate (200), and the tilt angle of the first bone plate (100) is finely adjusted by the cooperation of the arc rack (101) and the circular gear (103) disposed on one side of the first bone plate (100). The pressing component (2), which is located inside the non-locking screw (300), is used to allow the fibroblast growth factor inside to flow out and flow through the non-locking screw (300) to the calcaneal fracture area, thereby accelerating cell proliferation and promoting the ingrowth of new blood vessels into the fracture area. A horizontal displacement assembly (3), which is located inside the first bone plate (100), is used to adjust the position of two non-locking screws (300) laterally and can be fixed according to the area of ​​the calcaneal fracture; The puncture component (4), which is located inside the second bone plate (200), uses positional changes to force the fibroblast growth factor inside the second bone plate (200) to flow out and continue to be transported to the calcaneal surface through the groove opened on the bottom surface of the second bone plate (200), providing a rich blood supply for new bone formation.

2. The fixation device for calcaneal fractures according to claim 1, characterized in that: The adjustment assembly (1) also includes an arc-shaped rack (101). A transmission rod (102) is provided on the top of the second bone plate (200). A circular gear (103) is sleeved on one end of the transmission rod (102). An adjustment groove (104) is opened on the surface of the second bone plate (200). A positioning rod (105) is movably installed inside the adjustment groove (104). A support rod (106) is inserted and connected to the top of the first bone plate (100). The positioning rod (105) and the support rod (106) are connected by a support plate (107). When the user rotates the first bone plate (100) left and right, the arc-shaped rack (101) rotates accordingly. The meshing of the circular gear (103) and the arc-shaped rack (101) causes the transmission rod (102) to rotate inside the second bone plate (200). With the connection of the support plate (107), the positioning rod (105) rotates slightly inside the adjustment groove (104).

3. The fixation device for calcaneal fractures according to claim 1, characterized in that: The pressing component (2) includes: The through groove (201) is connected to the non-locking screw (300), and the through groove (201) is provided with a limiting collar (205). The middle part of the limiting collar (205) is provided with a cylindrical capsule (204) for storing fibroblast growth factors. The pusher (202) is movably installed inside the through groove (201), and a piercing needle (203) is provided at its bottom. The contact head (206) is located at the top of the cylindrical capsule (204), and is made of collagen. It is biocompatible and bioactive, and can support cell adhesion and tissue growth. Flow holes (207) are equally spaced on the top of the limiting ring (205) to carry fibroblast growth factors.

4. The fixation device for calcaneal fractures according to claim 1, characterized in that: The horizontal displacement component (3) includes four embedded strips (301). The four embedded strips (301) are symmetrically distributed inside the first bone plate (100) with respect to the center point. One end of each of the four embedded strips (301) is fitted with a fitting block (302). An extension plate (303) is provided between the inner walls of two adjacent fitting blocks (302). Two convex plates (306) are symmetrically arranged on the top of the two extension plates (303) to allow the horizontal displacement component (3) to move horizontally. Two anti-dislocation blocks (305) are provided at the bottom of the two extension plates (303), and a round sleeve (304) is provided at the top of each of the two anti-dislocation blocks (305) to enhance the stability of the non-locking screw (300) after insertion into the calcaneus. The concave holes (307) are respectively opened on the top of the first bone plate (100), and the top of the four protruding plates (306) are provided with limit bolts (308), which are threadedly connected to the concave holes (307).

5. The fixation device for calcaneal fractures according to claim 1, characterized in that: The puncture component (4) includes a circular capsule (402), and a receiving groove (401) is provided on the inner surface of the second bone plate (200). The circular capsule (402) is filled inside the receiving groove (401). Fibroblast growth factor is injected into the interior of the circular capsule (402), and the material of the circular capsule (402) is collagen, which has biocompatibility and bioactivity and can support cell adhesion and tissue growth.

6. The fixation device for calcaneal fractures according to claim 5, characterized in that: The interior of the receiving trough (401) is interconnected with the interior of the second bone plate (200). The fibroblast growth factor inside the circular capsule (402) can be smoothly guided to the surface of the calcaneal fracture along the interconnected area. Fibroblast growth factor is an angiogenic agent that can accelerate cell proliferation and improve the efficiency of calcaneal fracture healing.

7. The fixation device for calcaneal fractures according to claim 5, characterized in that: The puncture component (4) includes a follower (403), which is disposed on one side of the positioning rod (105). A fixing sleeve (404) is sleeved on the outside of the follower (403). A conical microneedle (405) is fixedly installed on one side of the fixing sleeve (404). The conical microneedle (405) is disposed on one side of the circular capsule (402). Both the conical microneedle (405) and the puncture needle (203) are made of polylactic acid-glycolic acid copolymer microfiber. The conical microneedle (405) and the puncture needle (203) are reinforced on the surface of the fixing sleeve (404) and the pusher (202) respectively by 3D printing. Polylactic acid-glycolic acid copolymer microfiber is a biodegradable polymer material that can serve as a strong temporary support to maintain the spatial structure in the early stage of fracture healing. In the middle stage, its degradation rate enables the release of encapsulated growth factors, promoting fracture healing.

8. The fixation device for calcaneal fractures according to claim 1, characterized in that: The surface of the second bone plate (200) is provided with an arc-shaped wrapping plate (400), the height of which is higher than that of the support plate (107). The top surface of the second bone plate (200) is provided with a reinforcing groove (500) for the installation of non-locking screws (300). The top surface of the first bone plate (100) is provided with a plurality of threaded holes (600), and the non-locking screws (300) are installed in the threaded holes (600).

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