Rib fracture embracing internal fixator

Abstract

The application discloses a rib fracture embracing type internal fixator, and relates to the technical field of orthopedics. The rib fracture embracing type internal fixator comprises an embracing plate, a plurality of embracing ends are arranged on the two long side walls of the embracing plate, the embracing plate is arranged in a C-shaped structure, is used for being transversely clamped at the fracture end of a fractured rib, the tensioning sheet is arranged in a C-shaped structure, the two end portions of the tensioning sheet can be arranged outside two opposite embracing ends on the embracing plate to form an embracing space, the space in the embracing space can be contracted and expanded for adjusting, and is used for accommodating fractured rib ends at different positions. The rib fracture embracing type internal fixator can stably fix the fractured rib position, and degradable material is adopted, so that secondary surgery is avoided.

Description

Technical Field

[0001] This invention relates to the field of orthopedic technology, specifically to a circumferential internal fixation device for rib fractures. Background Technology

[0002] In the field of thoracic trauma medicine, rib fractures are extremely common and highly dangerous injuries. As vital supporting structures of the chest, rib fractures not only cause excruciating pain but also severely disrupt normal breathing, leading to frequent complications such as shallow, rapid breathing and atelectasis. More seriously, multiple rib fractures disrupt the integrity of the chest wall, resulting in paradoxical breathing, also known as "flail chest." This further exacerbates respiratory dysfunction and may even directly damage vital organs within the chest cavity, such as the heart and lungs, endangering the patient's life.

[0003] Currently, treatment methods for rib fractures are mainly divided into conservative treatment and surgical treatment. Conservative treatment is usually suitable for rib fractures with no displacement or only slight displacement, mainly relying on chest band fixation and analgesic medication to promote natural fracture healing. However, chest band fixation has significant limitations; its fixation effect is not strong enough, and the chest band is prone to displacement during the patient's daily activities or breathing movements, failing to effectively restrict abnormal movement of the fracture ends. This can lead to micromovements between the fracture ends, affecting the biological environment for fracture healing, thus causing delayed fracture healing, or even the serious consequence of nonunion, resulting in long-term pain and inconvenience for the patient.

[0004] Currently, the most widely used internal fixation materials for surgical treatment in clinical practice are metals, such as stainless steel and titanium alloys. These metal materials, with their high strength and good stability, play a crucial role in providing reliable fixation for fracture sites, restoring chest wall integrity to a certain extent, and promoting the recovery of respiratory function. However, metal internal fixation materials also have significant drawbacks. Long-term retention of metal materials in the body inevitably leads to stress shielding. Due to the difference in mechanical properties between metal materials and human bone, they bear excessive stress, preventing the fractured bone from receiving sufficient stress stimulation. This affects the bone remodeling process and the normal recovery of mechanical properties at the fracture site, resulting in decreased bone quality and an increased risk of refracture. Summary of the Invention

[0005] The purpose of this invention is to provide a circumferential internal fixation device for rib fractures to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a circumferential internal fixation device for rib fractures, comprising a circumferential plate, wherein multiple circumferential ends extend from both long sidewalls of the circumferential plate, and the circumferential plate is configured in a C-shape for laterally locking at the fractured rib ends. The tensioning plate has a C-shaped structure, and its two ends can be placed on the outside of the two opposite circumferential ends of the circumferential plate to form a circumferential space. The space within the circumferential space can be contracted and expanded to accommodate broken ribs at different positions.

[0007] In a further embodiment, two baffles are fixed to the outer wall of the circumferential end, and two baffles are fixed to the inner sidewalls of both ends of the tensioning piece; Two baffles are positioned between two baffles.

[0008] In a further embodiment, it also includes a fastening screw, two push plates one and two push plates two. One end of each of the push plates one and two is provided with a threaded hole that is threaded to engage with the fastening screw. Each of the baffles one and two is provided with a through hole. The fastening screw slides through the through holes of the baffles one and two. The two push plates one are respectively distributed opposite to the side walls of the two baffles one that are far apart from each other. The push plates two are located between the baffles one and the baffles two. The threaded hole of push plate one has the opposite thread direction to the threaded hole of push plate two.

[0009] In a further embodiment, the ends of push plates one and two that are away from the threaded holes slide in contact with the outer wall of the circumferential end.

[0010] In a further embodiment, two baffles are fixed to the outer wall of the circumferential end, and two baffles are fixed to the inner sidewalls of both ends of the tensioning piece; Two baffles (one) and two baffles (two) are distributed in an alternating pattern.

[0011] In a further embodiment, it also includes a fastening screw, two push plates, and a limiting plate. One end of the limiting plate and the push plates is provided with a threaded hole that is threaded to the fastening screw. Both the first and second baffles are provided with through holes. The fastening screw slides through the through holes of the first and second baffles. The two push plates abut against the same side wall of the two second baffles. The limiting plate abuts against the side wall of the outermost baffle.

[0012] In a further embodiment, the end of the limiting plate and the pusher plate away from the threaded hole slides in contact with the outer wall of the circumferential end.

[0013] In a further embodiment, the through hole is an oblong hole, and the transverse width of the oblong hole is 2-4 times the outer diameter of the fastening bolt.

[0014] In a further embodiment, a reinforcing plate is also included. The reinforcing plate has an arc-shaped structure, and arc-shaped extension ends are provided at the ends of the two long side walls. The arc-shaped extension ends are provided with toothed blocks. A large opening is provided at the center of the circumferential plate. Toothed grooves are provided on the two opposite side walls of the large opening. The toothed blocks match the toothed grooves. The reinforcing plate has at least two recessed waist-shaped positioning holes.

[0015] In a further embodiment, the circumferential plate, tensioning plate, fastening bolt, push plate one, push plate two, push piece one, push piece two, limiting plate, and reinforcing plate are all made of PLA / PCL copolymer material.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention is a circumferential internal fixation device for rib fractures. The internal fixation device has an overall circumferential structure, which provides stable and reasonable support for the fracture site, effectively restricts abnormal movement of the fracture ends, creates a good biological environment for fracture healing, promotes fracture healing, better adapts to the different rib fracture conditions of different patients, meets diverse clinical needs, and improves the applicability and versatility of the internal fixation device.

[0017] 2. The present invention uses biodegradable materials that can gradually degrade in the body and be absorbed or metabolized by the body, avoiding the trouble of secondary surgery to remove them, reducing patient pain and medical costs; at the same time, the degradation process of biodegradable materials can match the fracture healing process, providing sufficient mechanical support in the early stage of fracture healing, and gradually degrading as the fracture heals, providing space for bone tissue growth and remodeling, which is conducive to the functional recovery of the fracture site. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the main structure of the present invention; Figure 2 For the present invention Figure 1 Enlarged view of the structure at point A in the middle; Figure 3 This is a schematic diagram of another embodiment of the main structure of the present invention; Figure 4 For the present invention Figure 3 Enlarged view of the structure at point B in the middle; Figure 5 This is a schematic diagram of the C-shaped tensioning plate structure of the present invention; Figure 6 This is a schematic diagram of the assembly structure of the C-shaped circumferential plate and the reinforcing plate of the present invention; Figure 7 This is a schematic diagram of the disassembled structure of the circumferential plate and the reinforcing plate of the present invention.

[0019] In the diagram: 1. Tooth groove; 2. Ring plate; 3. Reinforcing plate; 4. Ring end; 5. Baffle one; 6. Tensioning plate; 7. Fastening screw; 8. Push plate one; 9. Baffle two; 10. Push plate two; 11. Limiting plate; 12. Tooth block. Detailed Implementation

[0020] The technical solutions in the embodiments of the present invention will be clearly and completely described below. 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.

[0021] This embodiment provides a circumferential internal fixation device for rib fractures, such as... Figure 1 , Figure 3 and Figure 5 As shown, the device includes a circumferential plate 2, with multiple circumferential ends 4 extending from both long sidewalls. The circumferential plate 2 has a C-shaped structure and is used to laterally lock the fractured rib ends. The C-shaped design of the circumferential plate 2 is to better conform to the anatomical shape of the rib, facilitating installation and fixation. It also includes a tension plate 6, which has a C-shaped structure. The two ends of the tension plate 6 can be positioned outside the two opposing circumferential ends 4 on the circumferential plate 2, forming a circumferential space. The space within the circumferential space can be adjusted to accommodate rib ends at different positions.

[0022] The following is a detailed analysis of Example 1, as follows: Figure 1 and Figure 2 As shown, two baffles 5 are fixed to the outer wall of the circumferential end 4, and two baffles 9 are fixed to the inner walls of both ends of the tensioning plate 6. The two baffles 5 are positioned between the two baffles 9.

[0023] It also includes a fastening screw 7, two push plates 8 and two push plates 10. One end of each push plate 8 and push plate 10 has a threaded hole for threaded engagement with the fastening screw 7. Both baffles 5 and 9 have through holes through which the fastening screw slides. The fastening screw slides through the through holes of baffles 5 and 9. The two push plates 8 are respectively positioned opposite to the sidewalls of the two baffles 5, and the push plates 10 are located between baffles 5 and 9. The threaded holes of push plates 8 and 10 have opposite thread directions. Baffle 5 functions to cooperate with baffle 9 on tensioning plate 6 to adjust and fix the annular space. Here, the ends of push plates 8 and 10 furthest from the threaded holes slide in contact with the outer wall of the annular end 4.

[0024] Open the C-shaped structure of the circumferential plate 2 and place the fractured bone end in the center of the circumferential plate 2, ensuring that the ribs on both sides of the fractured bone end are covered by the circumferential end 4. Close the circumferential plate 2, aligning the baffles 9 at both ends of the tension plate 6 with the baffles 5 at the circumferential end 4, forming the circumferential space to be adjusted. Initial positioning: Slide the fastening screw 7 through the waist-shaped through holes of the baffles 5 and 9. These through holes are all waist-shaped, and the lateral width inside the waist-shaped hole is 2-4 times the outer diameter of the fastening bolt. The space inside the waist-shaped hole provides lateral displacement margin, allowing initial misalignment between the baffles. This design can compensate for the baffle alignment deviation caused by unevenness of the rib surface or bending error of the circumferential plate 2 during surgery, improving the adjustment tolerance. Rotating the fastening screw 7 causes the pushers 8 and 10 to move in opposite directions along the axial direction of the screw 7, due to their opposite thread directions: pusher 8 pushes baffle 5 towards baffle 9; pusher 10 pushes baffle 9 towards baffle 5. The dynamic contraction process involves baffles 5 and 9 approaching each other under the thrust, gradually reducing the encircling space until the inner wall of tensioning plate 6 is tightly against the rib surface. Continuing to rotate the fastening screw 7 utilizes the self-locking effect of the threads and material friction to fix the baffle position, thus locking the encircling space.

[0025] Example 2, as Figure 3 and Figure 4 As shown, two baffles 5 are fixed to the outer wall of the circumferential end 4, and two baffles 9 are fixed to the inner walls of both ends of the tensioning plate 6; the two baffles 5 and the two baffles 9 are distributed in a cross pattern.

[0026] It also includes a fastening screw 7, two push plates 10, and a limiting plate 11. One end of the limiting plate 11 and the push plates 10 are provided with threaded holes that are threaded to the fastening screw 7. Both the first baffle 5 and the second baffle 9 are provided with through holes. The fastening screw rod slides through the through holes of the first baffle 5 and the second baffle 9. The two push plates 10 abut against the same side wall of the two baffles 9 respectively. The limiting plate abuts against the side wall of the outermost baffle 5.

[0027] The ends of the limiting plate 11 and the pusher plate 2 10 furthest from the threaded holes are slidably brought into contact with the outer wall of the circumferential end 4. The baffles 1 5 and 2 9 are arranged in a staggered, circumferential structure. This staggered design increases the contact points between the circumferential end 4 and the ribs, dispersing local pressure. The through holes are all oblong, with a transverse width 2-4 times the outer diameter of the fastening bolt. The oblong holes provide lateral displacement margin, allowing initial misalignment between the baffles. The fastening screw 7 is passed through the oblong through holes of baffles 1 5 and 2 9, and the limiting plate 11 is installed next to the outermost baffle 1 5 (the threaded hole of the limiting plate 11 has the same thread direction as the pusher plate 2 10). When the fastening screw 7 is rotated, the limiting plate 11 and the pusher plate 2 10 move inward synchronously: the limiting plate 11 pushes one of the outer baffles 1 5; the pusher plate 2 10 pushes baffle 2 9. The two baffles move inward synchronously, achieving uniform contraction of the circumferential space.

[0028] The cross-distribution of baffles 5 and 9 creates a "scissor-like" support structure, distributing the circumferential force to four contact points, resulting in a more uniform stress distribution compared to the dual-point contact of Example 1. The limiting plate 11 is rigidly connected to the screw via threads, and its outer surface fits against the outer wall of the circumferential end 4, forming a mechanical stop structure. When the fastening screw 7 vibrates slightly due to breathing motion, the limiting plate 11 can prevent axial displacement of the fastening screw 7, avoiding changes in the circumferential space caused by the loosening of the pusher plate 10.

[0029] Through two different structural designs, Embodiment 1 and Embodiment 2, diverse adjustment methods for the circumferential space are provided, which can better adapt to different rib fracture conditions in different patients and meet diverse clinical needs. This flexible structural design improves the applicability and versatility of the internal fixation device, providing doctors with more choices and operational convenience during surgery.

[0030] At the same time, regardless of the implementation method used, it should be specifically noted that, such as Figure 1 , Figure 3 , Figure 6 and Figure 7 As shown, it also includes a reinforcing plate 3, which has an arc-shaped structure and arc-shaped extension ends at the ends of the two long side walls. The arc-shaped extension ends are provided with toothed blocks 12. A large opening is provided at the center of the circumferential plate 2. Toothed grooves 1 are provided on the two opposite side walls of the large opening. The toothed blocks 12 match the toothed grooves 1. At least two recessed waist-shaped positioning holes are provided on the reinforcing plate 3.

[0031] During installation, the circumferential plate 2 is first fixed at the rib fracture site. Then, the reinforcing plate 3 is positioned at the junction of the fracture ends, with its two recessed waist-shaped positioning holes aligned with the two fracture ends. Screws are then driven into the fracture ends, and simultaneously, the toothed blocks 12 of the reinforcing plate 3 are engaged with the toothed grooves 1 of the circumferential plate 2, achieving a stable connection between the reinforcing plate 3 and the circumferential plate 2. This not only enhances the connection stability between the internal fixator and the rib but also allows for more precise positioning and fixation, effectively preventing displacement of the internal fixator and providing a more reliable guarantee for fracture healing. This innovative design improves fixation effectiveness while also increasing the success rate of surgery and the quality of patient recovery. Meanwhile, the outer surface of the circumferential end 4 is designed with a textured structure that adapts to the surface of the rib. This textured structure can increase the friction between the internal fixator and the rib, improve the fixation firmness, and effectively prevent the internal fixator from sliding or shifting on the rib.

[0032] Currently, most fixators used in clinical practice are made of metal and are non-degradable. After the fracture has healed, a second surgery is required to remove them. This second surgery not only causes additional physical pain and increases the patient's financial burden, but may also lead to a series of surgical complications, such as infection and bleeding, further threatening the patient's health. To avoid the financial burden and secondary pain associated with a second surgery, the circumferential plate 2, tension plate 6, fastening bolt, push plate one, push plate two, push piece one 8, push piece two 10, limiting plate 11, and reinforcing plate 3 in Examples 1 and 2 are all made of PLA / PCL copolymer. This PLA / PCL copolymer is a biodegradable composite material with the molecular formula [C6H]. 10 By adjusting the ratio of PLA to PCL, a material combining the properties of both can be obtained. PLA exhibits good shape memory behavior under small deformations and responds quickly to heat; while PCL endows the material with flexibility and low-temperature plasticity.

[0033] The molecular formula of the PLA / PCL copolymer is [C6H] 10 O2] n [C3H4O2] m In this context, the values ​​of n and m are not fixed but adjusted according to specific application requirements. In the field of orthopedic rib fracture fixation, the ratio of n to m needs to balance the mechanical properties, degradation rate, and biocompatibility of the material. The following is a detailed analysis: Rib fracture fixation requires materials with sufficient strength and toughness to withstand the dynamic loads during respiratory movements. PLA provides rigidity and strength, while PCL enhances flexibility and impact resistance. A higher PLA ratio (n) increases material rigidity but may increase the risk of fracture due to brittleness. A higher PCL ratio (m) improves material flexibility but may result in insufficient support.

[0034] Due to the required degradation rate, the healing period for rib fractures is approximately 6-12 weeks, but complete bone remodeling requires several months. The material needs to degrade gradually after fracture healing to avoid long-term residue affecting bone remodeling. PLA degrades relatively slowly (approximately 2-4 years), while PCL degrades relatively quickly (approximately 1-2 years). By adjusting the ratio to control the copolymer degradation time to 12-18 months, for example, PLA:PCL=70:30 (n:m≈7:3), the degradation rate and support requirements can be balanced. Based on clinical application, PLA:PCL=70:30 (n:m≈7:3) is the optimal ratio for orthopedic rib fracture fixation for the following reasons: Mechanical properties: Tensile strength reaches 40-60 MPa, close to the strength of cortical bone (50-150 MPa), effectively supporting the ribs. Moderate elastic modulus (2-3 GPa) avoids stress shielding effects and promotes bone healing. Degradation rate: Complete degradation in vivo in approximately 14 months, matching the rib healing cycle and reducing the risk of secondary surgery. At this ratio, the adhesion rate of osteoblasts on the material surface increased by 30%, promoting bone integration. In animal experiments, the bone healing quality of the 70:30 copolymer fixation group was significantly better than that of the pure PLA or pure PCL groups.

[0035] The recommended mass ratio of PLA to PCL is 60:40 to 80:20 (n:m≈3:2 to 4:1). The optimal ratio is 70:30 (n:m≈7:3), which balances strength, degradation rate, and biocompatibility.

[0036] Low-temperature shaping mechanism: At temperatures between 0-10℃, the copolymer is in an amorphous or low-crystallinity state, with enhanced molecular chain mobility, allowing doctors to easily bend it into a shape that fits the ribs. Body temperature-triggered recovery: After implantation, body temperature (approximately 37℃) causes the material to reach above its glass transition temperature (Tg), triggering molecular chain rearrangement. The material automatically recovers to the pre-set optimal fixation shape, providing stable support for fractures.

[0037] Hydrolytic Degradation Mechanism: Both PLA and PCL are biodegradable polyesters, degrading gradually through the hydrolysis of ester bonds. The degradation products are lactic acid and hydroxyhexanoic acid, which can be metabolized by the human body into carbon dioxide and water and excreted without toxic side effects. Degradation Rate Control: Component Ratio: Increasing the PCL content reduces the material's crystallinity and accelerates the degradation rate; increasing the PLA ratio enhances crystallinity and slows down degradation. Microstructure: By blending, copolymerizing, or adding nanoparticles (such as hydroxyapatite), the porosity and crystallinity of the material can be adjusted to further precisely control the degradation rate, matching it to the fracture healing cycle (usually 3-6 months).

[0038] In clinical surgical applications, the internal fixation device is placed in an environment of 0-10℃ to keep it in a low-temperature, malleable state. The surgeon then bends the internal fixation device into a suitable shape based on the specific fracture morphology and curvature of the patient's ribs, allowing it to better conform to the rib contours.

[0039] During surgical installation, the circumferential structure formed by the circumferential plate 2 and the tensioning plate 6 is opened, and the circumferential plate 2 is placed on the fractured rib, with the fractured bone ends positioned in the middle of the circumferential arm. Then, the circumferential plate 2 and the tensioning plate 6 are closed, and the fastening screw 7 is rotated according to the method described in Embodiment 1 or Embodiment 2 to adjust the size of the circumferential space, ensuring the internal fixator tightly encircles the rib. Simultaneously, the toothed blocks 12 of the reinforcing plate 3 are engaged into the toothed grooves 1 of the circumferential plate 2 to further enhance the stability of the fixation. To further improve the stability of the fixation, an appropriate amount of bio-adhesive or bone cement, or other auxiliary fixation materials, can be filled between the internal fixator and the rib to enhance the adhesion between the internal fixator and the rib.

[0040] After an internal fixation device is implanted into the human body, it will gradually return to the pre-set optimal fixation shape when it comes into contact with body temperature (about 37°C), providing stable and reasonable support for the fracture site, effectively limiting abnormal movement of the fracture ends, and promoting fracture healing.

[0041] As the fracture heals, the internal fixation device slowly degrades, its elastic modulus gradually decreasing to adapt to the changing mechanical requirements during bone remodeling. The degradation products are non-toxic and can be metabolized and excreted by the body, avoiding the pain and risks of a second surgery for removal.

[0042] The above-mentioned components work together to achieve stable fixation of the rib fracture site, and the use of biodegradable materials avoids the need for a second surgery.

[0043] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A circumferential internal fixation device for rib fractures, characterized in that, include: The circumferential plate (2) has multiple circumferential ends (4) extending from both long sidewalls. The circumferential plate (2) is C-shaped and is used to be laterally locked at the broken ends of the fractured ribs. Tensioner (6), the tensioner (6) is arranged in a C-shaped structure, the two ends of the tensioner (6) can be placed on the outside of the two opposite circumferential ends (4) on the circumferential plate (2) to form a circumferential space, the space inside the circumferential space can be contracted and expanded to accommodate the broken ribs at different positions.

2. The circumferential internal fixation device for rib fractures according to claim 1, characterized in that, Two baffles (5) are fixed to the outer wall of the circumferential end (4), and two baffles (9) are fixed to the inner side walls of both ends of the tensioning plate (6). Two baffles (5) are positioned between two baffles (9).

3. The circumferential internal fixation device for rib fractures according to claim 2, characterized in that, It also includes a fastening screw (7), two push plates (8) and two push plates (10). One end of each of the push plates (8) and the push plates (10) is provided with a threaded hole that is threaded to the fastening screw (7). Both the baffle (5) and the baffle (9) are provided with through holes. The fastening screw rod slides through the through holes of the baffle (5) and the baffle (9). The two push plates (8) are respectively distributed opposite to the side walls of the two baffles (5) that are far away from each other. The push plates (10) are located between the baffles (5) and the baffles (9). The threaded hole of push plate one (8) has the opposite thread direction to the threaded hole of push plate two (10).

4. The circumferential internal fixation device for rib fractures according to claim 3, characterized in that, The ends of the pusher plate one (8) and pusher plate two (10) that are away from the threaded hole slide in contact with the outer wall of the circumferential end (4).

5. The circumferential internal fixation device for rib fractures according to claim 1, characterized in that, Two baffles (5) are fixed to the outer wall of the circumferential end (4), and two baffles (9) are fixed to the inner side walls of both ends of the tensioning plate (6). Two baffles (5) and two baffles (9) are interspersed.

6. The circumferential internal fixation device for rib fractures according to claim 5, characterized in that, It also includes a fastening screw (7), two push plates (10) and a limiting plate (11). One end of the limiting plate (11) and the push plates (10) are provided with threaded holes that are threaded to the fastening screw (7). The baffles (5) and the baffles (9) are provided with through holes. The fastening screw slides through the through holes of the baffles (5) and the baffles (9). The two push plates (10) abut against the same side wall of the two baffles (9) respectively. The limiting plate abuts against the side wall of the outermost baffle (5).

7. The circumferential internal fixation device for rib fractures according to claim 6, characterized in that, The end of the limiting plate (11) and the push plate 2 (10) away from the threaded hole slides in contact with the outer wall of the circumferential end (4).

8. The circumferential internal fixation device for rib fractures according to claim 4 or 6, characterized in that, The through hole is a waist-shaped hole, and the transverse width inside the waist-shaped hole is 2-4 times the outer diameter of the fastening bolt.

9. The circumferential internal fixation device for rib fractures according to claim 4 or 6, characterized in that, It also includes a reinforcing plate (3), which has an arc-shaped structure and arc-shaped extension ends at the ends of the two long side walls. The arc-shaped extension ends are provided with toothed blocks (12). The center of the circumferential plate (2) has a large opening, and toothed grooves (1) are provided on the two opposite side walls of the large opening. The toothed blocks (12) match the toothed grooves (1). The reinforcing plate (3) has at least two sinking waist-shaped positioning holes.

10. The circumferential internal fixation device for rib fractures according to claim 4 or 6, characterized in that, The circumferential plate (2), tensioning plate (6), fastening bolt, push plate one, push plate two, push piece one (8), push piece two (10), limiting plate (11) and reinforcing plate (3) are all made of PLA / PCL copolymer material.

Images