Bone fracture plate

Abstract

The invention relates to a bone fracture plate which is used for connecting fractured bones. The bone fracture plate comprises a trunk part and a tail part connected with one end of the trunk part, wherein the trunk part comprises a raised belly part and a flat back part connected with the belly part. The trunk part is implanted into a marrow cavity of the bone and partially shields the radial section of the marrow cavity. And the tail part is fixed on the skeleton. And the abdomen part and the back part both abut against the crack of the bone fracture. According to the bone fracture plate, the trunk part comprises the raised belly part and the flat back part, and the belly part and the back part abut against the fractured cracks of the bones, so that the bone fracture plate stably connects the fractured bones together, and the bone fracture plate cannot generate large deformation along with deformation of the bones. Meanwhile, the radial section of the marrow cavity is partially shielded by the trunk part, so that the marrow cavity is not completely blocked, and conveying of intramedullary nutrient substances is facilitated. In addition, the bone fracture plate is small in surgical wound surface.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, and particularly to an osteosynthesis plate. Background Art

[0002] At present, after a human bone is fractured, an osteosynthesis plate is often used to connect the fractured bones together.

[0003] There are two types of current osteosynthesis plates. One is the osteosynthesis plate fixed outside the bone, that is, the main body of the osteosynthesis plate is located outside the fractured bone. The other is the intramedullary fixation osteosynthesis plate, that is, the main body of the osteosynthesis plate is located inside the fractured bone, specifically, the osteosynthesis plate is fixed in the medullary cavity. Compared with the osteosynthesis plate fixed outside the bone, the intramedullary fixation osteosynthesis plate is closer to the mechanical neutral axis of the bone. Therefore, when bearing bending and torsional stresses, the load on the internal fixation is significantly less than that on the surface osteosynthesis plate.

[0004] Although the intramedullary fixation osteosynthesis plate has many advantages, most of the current intramedullary fixation osteosynthesis plates are flat. After a bone is fractured, the two ends of the intramedullary fixation osteosynthesis plate need to be respectively connected to the bones at both ends of the fracture crack by screws. There are many fixation points using screws, and the surgical trauma is large. And when the current intramedullary fixation osteosynthesis plate is mainly applied to fix the broken bones at the rib fracture site, due to the continuous reciprocating deformation of the ribs caused by human breathing. At the same time, because there is a large gap between the sheet-like structure of the intramedullary fixation osteosynthesis plate and the circumferential wall of the medullary cavity in the bone marrow, the intramedullary fixation osteosynthesis plate will deform continuously with breathing, and the long-term deformation is likely to cause the osteosynthesis plate to break at the stress concentration point.

[0005] In addition, Patent CN201810781994.3 proposes a minimally invasive intramedullary osteosynthesis plate, the intramedullary part of which uses the design of a traditional tubular intramedullary nail. However, there is a large gap between the intramedullary nail designed in the traditional form and the medullary cavity wall, and the fracture ends are prone to rotation or lateral displacement, affecting the healing. Summary of the Invention

[0006] Aiming at the problems existing in the above-mentioned prior art, the present invention discloses an intramedullary fixation osteosynthesis plate, which is not easy to break, has small surgical trauma, and the fracture ends are not easy to rotate or have lateral displacement.

[0007] The purpose of the present invention is achieved by the following technical solutions: An osteosynthesis plate for connecting fractured bones, comprising a trunk part and a tail part connected to one end of the trunk part. The trunk part includes a raised abdomen and a flat back connected to the abdomen. The trunk part is implanted in the medullary cavity of the bone and partially shields the radial cross-section of the medullary cavity. The tail part is fixed on the outer wall of the bone, and both the abdomen and the back abut against the fracture crack of the bone.

[0008] Further, the guiding part, the trunk part and the tail part are all made of degradable materials.

[0009] Furthermore, the trunk part has elasticity, and the trunk part enters the medullary cavity of the bone through an opening on the side wall of the bone, and the tail part is fixed on the outer wall of the bone.

[0010] Still further, the trunk part and the tail part are integrally formed of silk fibroin.

[0011] Further, it further includes a guiding part, and the guiding part and the tail part are respectively arranged on opposite sides of the trunk part.

[0012] Furthermore, the tail part is in the shape of a fish tail, and the thickness of the tail part gradually decreases in the direction away from the trunk part.

[0013] Furthermore, the guiding part is in the shape of a spiral rod.

[0014] Still further, one end of the guiding part away from the trunk part is subjected to blunt treatment.

[0015] Still further, the trunk part is in a strip shape, and the radial cross-sectional area of the trunk part gradually decreases from the middle towards the guiding part direction and the tail part direction.

[0016] Still further, the outer surface of the trunk part is streamlined, and the outer surface of the trunk part and the outer surface of the tail part are smoothly transitioned.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: By providing that the trunk part includes a raised abdomen and a flat back, and the abdomen and the back abut against the fracture crack of the bone, the bone plate stably connects the fractured bone together. The bone plate is not easily deformed greatly with the deformation of the bone, ensuring that the bone plate will not break due to long-term deformation, and the fracture end is not easily rotated or displaced laterally. At the same time, since the trunk part partially shields the radial cross-section of the medullary cavity, the medullary cavity is not completely blocked, which helps the delivery of intramedullary nutrients. In addition, the bone plate of the present invention can have as few as one fixing point fixed by screws, effectively reducing the trauma area during the operation. Description of the Drawings

[0018] Figure 1 is a schematic diagram of the implantation of a flat intramedullary fixation bone plate at the knee joint in the prior art; Figure 2 is a three-dimensional view of the bone plate of the present invention; Figure 3 is a top view of the bone plate of the present invention; Figure 4It is a schematic diagram of the implanting of the bone plate of the present invention at the rib; Figure 5 It is a schematic diagram of the implanting of the bone plate of the present invention at the knee joint.

[0019] In the figure: 1 - bone; 2 - trunk; 2a - abdomen; 2b - back; 3 - tail; 4 - guiding part; 5 - flat intramedullary fixation bone plate; 6 - screw; 7 - knee joint; 8 - fixing hole. Specific embodiments

[0020] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0021] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0022] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations. In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0023] As Figure 1 shown, in the prior art, the flat intramedullary fixation bone plate 5 is commonly used. In order to ensure the connection strength of the flat intramedullary fixation bone plate 5, the flat intramedullary fixation bone plate 5 is commonly made of metal. The traditional flat intramedullary fixation bone plate 5 has the following disadvantages: First, as Figure 1As shown, the fractured bone 1 is usually connected to both ends of the flat intramedullary fixation plate 5 by screws 6. Therefore, at least two screws 6 are required to complete the fixation of the flat intramedullary fixation plate 5 during the implantation process of the flat intramedullary fixation plate 5, that is, the flat intramedullary fixation plate 5 requires at least two fixed points, and the trauma formed during the operation is relatively large.

[0024] Second, as Figure 1 shown, the side wall of the flat intramedullary fixation plate 5 usually does not abut against the inner wall of the medullary cavity. Therefore, the flat intramedullary fixation plate 5 cannot fit well with the cylindrical cavity in the medulla. When the flat intramedullary fixation plate 5 is used to fix a fractured rib, the reciprocating deformation of the rib will occur during the breathing process of the human body. At this time, the flat intramedullary fixation plate 5 will produce a large amount of reciprocating deformation. The long-term reciprocating deformation is likely to cause the flat intramedullary fixation plate 5 to break at the stress concentration point. And because the gap between the side wall of the flat intramedullary fixation plate 5 and the medullary cavity is large, the fracture ends are prone to rotation or lateral displacement, affecting the healing.

[0025] To address the above deficiencies, as an improvement, the present invention proposes a bone plate, as Figures 2 to 5 shown. The bone plate of the present invention is used to connect the fractured bone 1, and the bone 1 can be bones at various positions in the human body such as ribs, leg bones, knee bones, arm bones, etc. The bone plate of the present invention includes an elastic trunk part 2 and a tail part 3 connected to one end of the trunk part 2. The trunk part 2 includes a raised abdomen 2a and a flat back 2b connected to the abdomen 2a. The abdomen 2a and the back 2b are the same as the abdomen and back of the human body, and the abdomen 2a and the back 2b are arranged on opposite sides of the trunk part 2.

[0026] The trunk part 2 is used to be implanted into the medullary cavity in the bone 1 and partially shield the radial cross-section of the medullary cavity. When the bone plate of the present invention connects the fractured bone 1, the fractured bone 1 here is referred to as the fractured left bone and the fractured right bone. After the trunk part 2 completely enters the medullary cavity, the tail part 3 is fixed on the bone 1. Specifically, the trunk part 2 is located in the medullary cavities of the fractured left bone and the fractured right bone, connecting the fractured left bone and the fractured right bone, and the tail part 3 is fixed on the fractured right bone.

[0027] In the trunk part 2 located in the medullary cavity, both its abdomen 2a and back 2b abut against the fracture crack of the bone 1. Specifically, the raised abdomen 2a abuts against the lower inner wall of the medullary cavities of the fractured left bone and the fractured right bone, and the flat back 2b abuts against the upper inner wall of the medullary cavities of the fractured left bone and the fractured right bone. Since the abdomen 2a and the back 2b respectively abut against the upper and lower inner walls of the medullary cavity, there is a large frictional force between the trunk part 2 and the inner wall of the medullary cavity, making the fractured left bone and the fractured right bone not easily move relative to the trunk part 2, so that the fractured left bone and the fractured right bone can be connected together through the trunk part 2.

[0028] The bone plate of the present invention has the following advantages compared with the prior art: First, since the back 2b is a flat plane under normal conditions, while the abdomen 2a bulges under normal conditions, the cross-section of the trunk 2 is similar to an inverted triangle. When the trunk 2 enters the bone marrow cavity, such as when entering the bone marrow cavity at the rib fracture site, as Figure 4 shown, the large-area plane of the back 2b abuts against the inner wall of the bone marrow cavity, effectively increasing the friction between the inner wall of the bone marrow cavity and the trunk 2, and at the same time also playing a role in increasing the strength of the trunk 2 to prevent excessive deformation of the trunk 2. And the back 2b can provide a large-area and stable supporting surface for the fractured bone 1, effectively and evenly dispersing the stress during the reciprocating deformation of the bone plate, avoiding stress concentration, and the bone plate is not easily broken due to the long-term deformation caused by human breathing, so as to better maintain the normal shape of the bone 1 and promote the healing of the fracture site. And because the triangle has strong stability, the trunk 2 with a cross-section similar to an inverted triangle has high strength. When the bone plate of the present invention is used to connect the fracture position at the knee joint, as Figure 5 shown, the trunk 2 is not easily deformed even during a long period of pressure, and at the same time, due to the friction between the inner wall of the bone marrow cavity and the trunk 2, the trunk is not easily moved in the bone marrow cavity, ensuring the supporting effect of the trunk 2. Therefore, the bone plate of the present invention can be used for connecting fractured bones at human ribs, arms, hip joints, legs, etc.

[0029] Second, because the cross-section of the trunk 2 is in the shape of an inverted triangle, the trunk 2 partially shields the radial cross-section of the bone marrow cavity, that is, the trunk 2 does not completely block the bone marrow cavity, and there is a gap near the abdomen 2a for the nutrients in the bone marrow cavity to flow freely, which helps the recovery of the fractured bone 1.

[0030] Third, for the bone plate of the present invention, since both the abdomen 2a and the back 2b of the trunk 2 abut against the inner wall of the bone marrow cavity, and both the abdomen 2a and the back 2b abut against the crack of the bone 1, and the abdomen 2a and the back 2b respectively abut against the opposite inner walls of the bone marrow cavity, the contact area between the abdomen 2a and the back 2b and the inner wall of the bone marrow cavity is large, and the friction between the abdomen 2a and the back 2b and the inner wall of the bone marrow cavity is large, resulting in that in the radial direction of the bone marrow cavity, the trunk 2 is not easily displaced, and the fracture end is not easily rotated or laterally displaced. In order to prevent the trunk 2 from moving in the axial direction of the bone marrow cavity, it is necessary to fix the tail 3 on the bone 1. And the tail 3 has only one fixing point, that is, at least only one screw 6 is required. Therefore, compared with the technical solution of at least two screws 6 in the prior art, the bone plate of the present invention causes less trauma to the human body during the operation.

[0031] In the bone plate of the present invention, there are various implementation manners for many technical features such as the material of the bone plate and the shape of the tail part 3. In the following, among many technical features such as the material of the bone plate, one implementation manner is mainly selected for each technical feature for detailed description, and the embodiment where this implementation manner is located is called this embodiment. Other implementation manners of many features such as the material of the bone plate are called other embodiments, and for other embodiments, a brief description is given below.

[0032] In the intramedullary fixation bone plate of the prior art, since the bone plate is usually made of metal materials, most bone plates need to be removed after the bone 1 self-repairs. However, if the intramedullary fixation bone plate is removed after the fractured bone 1 heals, the removal surgery is relatively complicated. Since the bone plate is located in the bone marrow cavity, it is necessary to cut open the soft tissue near the bone 1 again during removal to re-expose the bone 1. And careful operation is also required during the removal process to avoid unnecessary damage to the tissues around the bone 1.

[0033] Therefore, in this embodiment, both the trunk part 2 and the tail part 3 are made of degradable materials. There are various degradable materials. For example, the bone plate of the present invention can be made of silk fibroin. Silk fibroin is degradable and has good mechanical properties and physicochemical properties, such as good flexibility, tensile strength, air and moisture permeability, and sustained release property. The bone plate of the present invention can also be made of metal-based degradable materials such as magnesium-based alloys and zinc-based alloys, as well as polylactic acid (PLA) and its copolymers (PLA / PCLA) composites. By setting the bone plate to be made of degradable materials, after the fractured bone 1 heals, the bone plate automatically degrades. There is no need to perform surgery again to remove the bone plate, reducing the possibility of secondary injury. In other embodiments, the bone plate of the present invention can also be made of medical implant materials with good biocompatibility with the human body, such as TC4 titanium alloy, stainless steel, PEEK materials, etc. These materials always remain in the human body after implantation and do not need to be removed.

[0034] In the intramedullary fixation bone plate of the prior art, during the implantation process, the flat intramedullary fixation bone plate 5 is mostly implanted into the body from the proximal side of the bone, as Figure 1 shown. When the bone at the knee is fractured, the flat intramedullary fixation bone plate 5 is usually implanted from the knee joint into the fracture near the knee, so it will cause damage to the knee joint 7 and the trauma is relatively large. When the trunk part 2 of the bone plate of the present invention enters the bone marrow cavity, if it is also implanted into the bone marrow cavity from the knee joint 7, it will also result in the defect of relatively large trauma. At the same time, the traditional flat intramedullary fixation bone plate 5 is usually made of metal materials. During the implantation process, because it is relatively hard, it will damage the bone marrow cavity, resulting in bleeding in the bone marrow cavity. If the hemostasis is not thorough, a hematoma may form, increasing the risk of infection. In addition, most metal flat intramedullary fixation bone plates 5 are prone to cause rejection reactions.

[0035] To solve this problem, in this embodiment, the trunk 2 is set to be elastic, and the trunk 2 enters the bone marrow cavity of the bone 1 through an opening on the side wall of the bone 1, and the tail 3 is fixed on the outer wall of the bone 1. For ease of understanding, this embodiment takes the fracture at the knee joint 7 as an example. During the surgical process of the bone plate of the present invention, such as Figure 5 As shown, first, a surgical hole communicating with the bone marrow cavity is opened on the side wall of the fractured right bone, and then the end of the trunk 2 away from the tail 3 is directed towards the surgical hole, and the trunk 2 is driven into the bone marrow cavity. Since the trunk 2 is elastic, it deforms during the process of entering the bone marrow cavity, so that the trunk 2 can smoothly enter the bone marrow cavity. Because the trunk 2 of the present invention is elastic and the trunk 2 enters the bone marrow cavity from the side of the fractured bone 1, when the bone plate of the present invention connects the fractured bones at the knee joint, it effectively avoids damaging the knee joint 7, and the surgical hole is arranged close to the tail 3, making the surgical wound smaller. At the same time, because the trunk 2 is elastic, during the process of the trunk 2 entering the bone marrow cavity, unlike the flat intramedullary fixation bone plate 5 made of metal materials in the prior art, the elastic trunk 2 is not likely to damage the inner wall of the bone marrow cavity. In other embodiments, when the trunk 2 is made of a material with less elasticity, it still needs to be implanted into the body from the proximal side of the bone.

[0036] In this embodiment, as Figures 2 to 5 As shown, the tail 3 is provided with a fixing hole 8, and a screw 6 is arranged to pass through the fixing hole 8 to fix the tail 3 on the outer wall of the bone 1. And in this embodiment, the screw 6 is also made of silk fibroin. Through the setting of the fixing hole 8, the present invention facilitates the further fixation of the bone plate of the present invention, thereby further enhancing the stability between the bone plate of the present invention and the bone 1, greatly reducing the probability of the bone plate of the present invention rotating or displacing in the bone marrow cavity, and ensuring that the fracture site is always in a stable fixation state during the healing process, creating favorable conditions for the rehabilitation of the patient. In other embodiments, a clamping groove can also be arranged on the outer wall of the bone, and a clamping block can be arranged on the tail 3, and the tail 3 can be fixed on the outer wall of the bone 1 by the cooperation of the clamping block and the clamping groove.

[0037] In this embodiment, both the trunk part 2 and the tail part 3 are integrally formed from silk fibroin. Silk fibroin has good mechanical properties and physicochemical properties, such as good flexibility, tensile strength, air permeability, moisture permeability, and slow-release property. Silk fibroin can be degraded in the bone marrow cavity, and the degraded substances are mainly amino acids, which can be absorbed and utilized by the human body. Moreover, silk fibroin has excellent biocompatibility, which can greatly reduce the rejection reaction of the human immune system to the implant. Medical devices made of silk fibroin can significantly improve the comfort and safety of patients' postoperative recovery. By setting that both the trunk part 2 and the tail part 3 are integrally formed from silk fibroin, the bone plate of the present invention is more convenient to prepare and can be integrally formed by means of 3D printing, casting, etc. Moreover, through the application of silk fibroin, the trunk part 2 is degradable and elastic. In other embodiments, the trunk part 2 and the tail part 3 can be composed of metal-based degradable materials such as magnesium-based alloys and zinc-based alloys, as well as polylactic acid (PLA) and its copolymers (PLA / PCLA). During the production process of the bone plate, polylactic acid (PLA) can be coated on the outside of the metal-based degradable materials. The metal-based degradable materials mainly play a role in enhancing the strength of the bone plate. Although polylactic acid (PLA) has elasticity, its elasticity is worse than that of silk fibroin. During the degradation process of polylactic acid (PLA) and the metal-based degradable materials, polylactic acid (PLA) and its copolymers (PLA / PCLA), which are formed by the polymerization of lactic acid monomers, can be degraded into lactic acid (a natural metabolite in the body, which is metabolized by the liver into CO2 and H2O). Polylactic acid (PLA) and its copolymers (PLA / PCLA) produce acidity during degradation, while metal-based degradable materials such as zinc-based alloys produce alkalinity during degradation. Therefore, through acid-base neutralization, the bone plate made of polylactic acid (PLA) and the metal-based degradable materials will not cause harm to the human body during the degradation process, but its preparation process, mechanical properties, and degradation effect are not as good as those of the bone plate made of silk fibroin.

[0038] In this embodiment, as Figures 2 to 5As shown in the figure. The bone plate of the present invention further includes a guiding portion 4. The guiding portion 4 is generally arranged in a slender rod shape, and the guiding portion 4 can also be arranged in a vertebral body shape. The guiding portion 4 and the tail portion 3 are respectively arranged on opposite sides of the trunk portion 2. The guiding portion 4, the trunk portion 2, and the tail portion 3 are all integrally formed by silk protein. The bone plate composed of the trunk portion 2, the tail portion 3, and the guiding portion 4 can change the dimensions of each part such as the trunk portion 2 according to the implantation site to meet the implantation requirements of different positions. Through the setting of the guiding portion 4, during the process of implanting the bone plate of the present invention into the bone marrow cavity, the guiding portion 4 and the trunk portion 2 enter the bone marrow cavity in sequence. During this process, since the bone marrow cavity is not a cavity, there is red bone marrow and yellow bone marrow inside, and the intramedullary environment is complex. Therefore, the setting of the guiding portion 4 plays a guiding role during the process of the trunk portion 2 entering the bone marrow cavity, opens a path for the movement of the trunk portion 2 in the bone marrow cavity, and assists the trunk portion 2 to be accurately implanted into the bone marrow cavity. And in this embodiment, the guiding portion 4 enters the bone marrow cavity through the surgical hole on the side wall of the bone 1. In other embodiments, when the bone plate of the present invention fixes a fracture at a location where the bone marrow cavity environment is not complex, such as when there are no other debris such as bone chips inside the bone marrow cavity, the guiding portion 4 may not be provided. And in other embodiments, the guiding portion 4, the trunk portion 2, and the tail portion 3 may also be made of metal-based degradable materials, polylactic acid (PLA) and its copolymers (PLA / PCLA). In addition, in other embodiments, the guiding portion 4 may also enter the bone marrow cavity from the proximal end of the bone.

[0039] In this embodiment, as Figure 2 and Figure 3 shown, the tail portion 3 of the bone plate of the present invention is in a fish-tail shape, and the thickness of the tail portion 3 gradually decreases in the direction away from the trunk portion 2. And the tail portion 3 is set to be arc-shaped, and the arc opening of the tail portion 3 faces the abdominal side 2a. Since the tail portion 3 is also made of silk protein, the tail portion 3 can wrap around the outer surface of the bone 1 according to its elasticity. The fish-tail-shaped tail portion 3 has two advantages. One is that the area of the tail portion 3 is relatively large, which is beneficial to the fixation of the tail portion 3 to the outer wall of the bone 1. The other is that the thickness of the end of the tail portion 3 far from the trunk portion 2 is relatively thin, which reduces the influence on the soft tissues near the bone 1 and reduces the possibility of the occurrence of the notch phenomenon. In other embodiments, the tail portion 3 may also be set in a thin sheet shape, which can further reduce the possibility of the occurrence of the notch phenomenon, but the tail portion 3 needs to be made of other degradable materials to ensure the fixation strength of the tail portion 3.

[0040] In this embodiment, as Figures 2 to 5 shown, the guiding portion 4 is arranged in a spiral rod shape. By setting the guiding portion 4 in a spiral rod shape, during the process of implanting the bone plate of the present invention into the bone marrow cavity, the guiding portion 4 can effectively guide the trunk portion 2 to move precisely along the bone marrow cavity, greatly reducing the risk of implantation deviation caused by the irregularity of the bone marrow cavity, ensuring that the trunk portion 2 reaches the predetermined position smoothly, and fully exerting the guiding function of the guiding portion 4. In other embodiments, the guiding portion 4 may also be set in a conical shape.

[0041] In order to further facilitate the advancement of the guiding portion 4 within the bone marrow cavity, and due to the complex environment within the bone marrow cavity, in the prior art, the end of the guiding portion 4 away from the trunk portion 2 is usually set to be relatively sharp. However, precisely this sharp structure causes the risk that its sharp head may pierce through the ribs or joints during actual surgical operations.

[0042] Therefore, in this embodiment, as Figures 2 to 5 shown, the end of the guiding portion 4 away from the trunk portion 2 is subjected to a blunt treatment. By means of the blunt treatment of the guiding portion 4 and with the guiding portion 4 made of elastic silk fibroin, while the guiding portion 4 has the guiding ability, the situation of piercing through the bone 1 is greatly reduced. In other embodiments, a retractable sleeve may be provided on the guiding portion 4, and the end of the guiding portion 4 away from the trunk portion 2 is subjected to a sharpening treatment. However, once the resistance received by the guiding portion 4 is greater than the set value, the rod with a sharpened tip retracts into the sleeve, and the effect of preventing the piercing of the bone 1 can also be achieved.

[0043] In this embodiment, as Figures 2 to 5 shown, the trunk portion 2 is strip-shaped, and the radial cross-sectional area of the trunk portion 2 gradually decreases from the middle towards the guiding portion 4 direction and the tail portion 3 direction. Thus, the bone plate composed of the guiding portion 4, the trunk portion 2, and the tail portion 3 in the present invention adopts a biomimetic design in the shape of a narwhal. Through the setting of the guiding portion 4 and the structural configuration of the trunk portion 2, when the bone plate of the present invention is implanted, it can not only effectively drive the trunk portion 2 to accurately advance along the bone marrow cavity, reducing the risk of implantation deviation caused by the irregularity of the bone marrow cavity, but also greatly reduce the resistance of the trunk portion 2 implanted into the medullary cavity. In other embodiments, the radial cross-sectional areas of each part of the trunk portion 2 can also be set to be the same, which can enhance the connection strength of the bone plate of the present invention, but relatively speaking, the implantation difficulty of the trunk portion 2 increases.

[0044] In this embodiment, as Figures 2 to 5As shown, the outer surface of the trunk 2 is streamlined, and the outer surface of the trunk 2 and the outer surface of the tail 3 are smoothly transitioned. The radial cross-sectional area of the trunk 2 is much larger than the cross-sectional area of the tail 3. Therefore, if there is no smooth transition at the connection between the trunk 2 and the tail 3, the strength at the connection between the trunk 2 and the tail 3 will be relatively low. When the bone plate of the present invention is implanted into the rib, due to the reciprocating movement of the rib caused by human breathing, fatigue fracture may occur at the connection between the trunk 2 and the tail 3. Therefore, the present invention provides a smooth transition between the outer surface of the trunk 2 and the outer surface of the tail 3. Thus, the outer surface at the connection between the trunk 2 and the tail 3 is arc-shaped. The arc-shaped connection greatly increases the fatigue strength at the connection between the trunk 2 and the tail 3 and reduces the probability of mutual fracture between the trunk 2 and the tail 3. At the same time, the trunk 2 and the tail are integrally designed in a streamlined shape, which facilitates the implantation of the trunk 2. At the same time, since the outer surface of the trunk 2 is streamlined and the radial cross-sectional area of the trunk 2 gradually decreases from the middle towards the guiding part 4, the end of the trunk 2 away from the tail 3 is a streamlined tip, making the trunk 2 smoother during the process of entering the bone marrow cavity. In other embodiments, when the bone plate is made of polylactic acid (PLA) and its copolymers (PLA / PCLA) and metal-based degradable materials, since the metal-based degradable materials have a certain fatigue strength, the shape of the connection between the trunk 2 and the tail 3 can be set arbitrarily.

[0045] In summary, the bone plate of the present invention is configured such that the trunk part 2 is composed of a raised abdomen 2a and a flat back 2b, making the bone plate of the present invention not easily breakable, and the fracture ends not easily rotate or shift laterally. It can be used for connecting multiple fractured bones 1 in the human body such as ribs. At the same time, the bone plate of the present invention requires at least only one fixing point to complete the fixation of the bone plate, so the trauma to the human body is relatively small. In addition, the trunk part 2 does not completely block the bone marrow cavity, which helps the free flow of nutrients in the bone marrow cavity. By making both the trunk part 2 and the tail part 3 of degradable materials, it avoids the damage to the soft tissues near the bone 1 during the second operation. By setting the trunk part 2 to be elastic, it avoids the damage to other parts such as the knee joint 7, and the trunk part 2 is not easily damaged to the inner wall of the bone marrow cavity during the implantation process. By setting both the trunk part 2 and the tail part 3 to be integrally formed of silk protein, the bone plate of the present invention is easy to prepare, and the trunk part 2 is degradable and elastic. By the setting of the guiding part 4, it helps to assist the accurate implantation of the trunk part 2 into the bone marrow cavity. By setting the tail part 3 of the bone plate to be fish-tail shaped, the probability of notch occurrence is reduced. By the setting of the fixing holes 8, it is convenient for the further fixation of the bone plate of the present invention. By setting the guiding part 4 to be in the shape of a spiral rod, it effectively guides the trunk part 2 to accurately advance along the bone marrow cavity. By the passivation treatment of the guiding part 4, the situation of piercing through the bone 1 is greatly reduced. By setting the radial cross-sectional area of the trunk part 2 to gradually decrease from the middle towards the guiding part 4 and the tail part 3, the resistance of the trunk part 2 implanted into the medullary cavity is reduced. By setting the outer surface of the trunk part 2 and the outer surface of the tail part 3 to have a smooth transition, the probability of the trunk part 2 and the tail part 3 breaking from each other is effectively reduced.

[0046] It should be emphasized that the above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. An osteosynthesis plate for connecting fractured bones (1), characterized in that, It includes a trunk (2) and a tail (3) connected to one end of the trunk (2). The trunk (2) includes a bulging abdomen (2a) and a flat back (2b) connected to the abdomen (2a). The trunk (2) is implanted into the bone marrow cavity of the bone (1) and partially shields the radial cross-section of the bone marrow cavity. The tail (3) is fixed to the bone (1), and both the abdomen (2a) and the back (2b) abut against the fracture crack of the bone (1).

2. The bone plate according to claim 1, characterized in that, Both the trunk (2) and the tail (3) are made of biodegradable materials.

3. The bone plate according to claim 2, characterized in that, The trunk (2) is elastic, and the trunk (2) enters the bone marrow cavity of the bone (1) through an opening on the side wall of the bone (1), and the tail (3) is fixed on the outer wall of the bone (1).

4. The bone plate according to claim 3, wherein Both the trunk (2) and the tail (3) are integrally formed of silk protein.

5. The bone plate according to claim 1, characterized in that, It further includes a guiding part (4), and the guiding part (4) and the tail (3) are respectively arranged on opposite sides of the trunk (2).

6. The bone plate according to claim 5, characterized in that The tail (3) is in the shape of a fish tail, and the thickness of the tail (3) gradually decreases in the direction away from the trunk (2).

7. The bone plate according to claim 5, characterized in that, The guiding part (4) is in the shape of a spiral rod.

8. The bone plate according to claim 7, wherein One end of the guiding part (4) away from the trunk (2) is subjected to blunt treatment.

9. The bone plate according to claim 6, characterized in that, The trunk (2) is strip-shaped, and the radial cross-sectional area of the trunk (2) gradually decreases from the middle towards the direction of the guiding part (4) and the tail (3).

10. The bone plate according to claim 9, characterized in that, The outer surface of the trunk (2) is streamlined, and the outer surface of the trunk (2) and the outer surface of the tail (3) are smoothly transitioned.

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