bone plates

Abstract

The present invention relates to a bone plate for connecting fractured bones. The bone plate includes a trunk and a tail connected to one end of the trunk, and the trunk includes a raised abdomen and a flat back connected to the abdomen. The trunk is implanted in the bone marrow cavity of the bone and partially shields the radial cross-section of the bone marrow cavity. The tail is fixed to the bone. The abdomen and the back both abut the crack of the broken bone. The present invention provides a trunk including a raised abdomen and a flat back, and the abdomen and the back abut the crack of the broken bone, so that the bone plate stably connects the fractured bones together, and the bone plate will not deform significantly with the deformation of the bone. At the same time, because the trunk partially shields the radial cross-section of the bone marrow cavity, the bone marrow cavity is not completely blocked, which helps to transport nutrients in the bone marrow. In addition, the surgical wound of the bone plate of the present invention is small.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, and in particular to a bone fracture plate. Background Art

[0002] Currently, after a human bone fracture occurs, a bone plate is often used to connect the fractured bones together.

[0003] Currently, there are two types of bone plates. One is externally fixed to the bone, meaning the main body of the plate is located outside the fractured bone. The other is intramedullary fixed, meaning the main body of the plate is located inside the fractured bone, specifically securing the plate within the bone marrow cavity. Intramedullary fixed plates are closer to the bone's neutral axis than externally fixed plates, so when subjected to bending and torsional stresses, the load on the internal fixation device is significantly less than that on surface plates.

[0004] Although intramedullary fixation plates have many advantages, most current intramedullary fixation plates are flat. After a bone fracture occurs, the two ends of the intramedullary fixation plate need to be connected to the bones at both ends of the fracture crack with screws. The number of fixation points using screws is large, and the surgical trauma is relatively large. In addition, current intramedullary fixation plates are mainly used to fix broken bones at rib fractures. The ribs are constantly deformed due to human breathing. At the same time, due to the large gap between the sheet-like structure of the intramedullary fixation plate and the circumferential wall of the medullary cavity, the intramedullary fixation plate will continue to deform with breathing. Long-term deformation can easily cause the plate to break at the stress concentration point.

[0005] In addition, patent CN201810781994.3 proposes a minimally invasive intramedullary bone plate, the intramedullary part of which adopts a traditional tubular intramedullary nail design. However, the gap between the traditional intramedullary nail and the medullary cavity wall is large, and the fracture end is prone to rotation or lateral displacement, affecting healing. Summary of the Invention

[0006] In view of the problems existing in the above-mentioned prior art, the present invention discloses an intramedullary fixation bone plate, which is not easy to break, has little surgical trauma, and is not easy for the fracture end to rotate or shift laterally.

[0007] The purpose of the present invention is achieved through the following technical solutions:

[0008] A bone plate for connecting fractured bones, comprising a trunk and a tail connected to one end of the trunk, wherein the trunk comprises a raised belly and a flat back connected to the belly; the trunk is implanted in the bone marrow cavity and partially shields the radial cross-section of the bone marrow cavity; the tail is fixed to the outer wall of the bone, and the belly and the back both bear against the crack of the broken bone.

[0009] Furthermore, the guide portion, the trunk portion and the tail portion are all made of degradable materials.

[0010] Furthermore, the trunk is elastic, and the trunk enters the bone marrow cavity of the bone from a hole in the side wall of the bone, and the tail is fixed on the outer wall of the bone.

[0011] Furthermore, the trunk and the tail are both made of silk protein in one piece.

[0012] Furthermore, it also includes a guide portion, and the guide portion and the tail portion are respectively arranged on opposite sides of the trunk portion.

[0013] Furthermore, the tail is in a fishtail shape, and the thickness of the tail gradually decreases as it moves away from the trunk.

[0014] Furthermore, the guide portion is in the shape of a spiral rod.

[0015] Furthermore, the end of the guide portion away from the trunk portion is passivated.

[0016] Furthermore, the trunk is strip-shaped, and the radial cross-sectional area of the trunk gradually decreases from the middle toward the guide portion and the tail.

[0017] Furthermore, the outer surface of the trunk is streamlined, and the outer surface of the trunk transitions smoothly with the outer surface of the tail.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: by providing a trunk portion including a raised abdomen and a flat back, and the abdomen and back portions abutting against the cracks of the bone fractures, the bone plate stably connects the fractured bones together, and the bone plate is not easily deformed by the deformation of the bones, thereby 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 portion partially obscures the radial cross-section of the bone marrow cavity, the bone marrow cavity is not completely blocked, which facilitates the transport of nutrients within the marrow. In addition, the bone plate of the present invention can be fixed with screws at at least one fixing point, effectively reducing the area of trauma during surgery. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of implanting a flat intramedullary fixation plate in the knee joint in the prior art;

[0020] Figure 2 is a three-dimensional view of the bone plate of the present invention;

[0021] Figure 3 is a top view of the bone plate of the present invention;

[0022] Figure 4 is a schematic diagram of the implantation of the bone plate of the present invention at the rib;

[0023] Figure 5 It is a schematic diagram of implanting the bone plate of the present invention at the knee joint.

[0024] In the picture:

[0025] 1-bone; 2-trunk; 2a-abdomen; 2b-back; 3-tail; 4-guide; 5-flat intramedullary fixation plate; 6-screw; 7-knee joint; 8-fixation hole. DETAILED DESCRIPTION

[0026] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0027] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be internal communication between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0029] like Figure 1 As shown, a flat plate type intramedullary fixation plate 5 is commonly used in the prior art. In order to ensure the connection strength of the flat plate type intramedullary fixation plate 5, the flat plate type intramedullary fixation plate 5 is usually made of metal. The conventional flat plate type intramedullary fixation plate 5 has the following disadvantages:

[0030] First, as Figure 1 As shown, the fractured bone 1 is usually connected to the two ends of the flat-plate intramedullary fixation plate 5 by screws 6. Therefore, at least two screws 6 are required to complete the fixation of the flat-plate intramedullary fixation plate 5 during the implantation process of the flat-plate intramedullary fixation plate 5, that is, the flat-plate intramedullary fixation plate 5 requires at least two fixing points, and the trauma caused during the operation is relatively large.

[0031] Second, if Figure 1 As shown, the sidewalls of the flat intramedullary fixation plate 5 typically do not abut the intramedullary wall, so the flat intramedullary fixation plate 5 cannot fit well within the cylindrical cavity within the medullary cavity. When the flat intramedullary fixation plate 5 is used to fix a broken rib, the rib will reciprocate during breathing, causing the flat intramedullary fixation plate 5 to undergo significant reciprocating deformation. This prolonged reciprocating deformation can easily cause the flat intramedullary fixation plate 5 to break at the stress concentration point. Furthermore, due to the large gap between the sidewalls of the flat intramedullary fixation plate 5 and the medullary cavity, the fractured end is prone to rotation or lateral displacement, affecting healing.

[0032] In view of the above defects, as an improvement, the present invention proposes a bone plate, such as Figures 2 to 5 As shown, the bone plate of the present invention is used to connect a fractured bone 1, which can be a rib, leg bone, kneecap, arm bone, or any other bone in the human body. The bone plate of the present invention comprises a resilient trunk portion 2 and a tail portion 3 connected to one end of the trunk portion 2. The trunk portion 2 includes a raised abdomen 2a and a flat back portion 2b connected to the abdomen 2a. The abdomen 2a and back portion 2b are similar to the abdomen and back of the human body and are located on opposite sides of the trunk portion 2.

[0033] The trunk portion 2 is implanted within the medullary cavity of a bone 1 and partially obscures the radial cross-section of the medullary cavity. When the bone plate of the present invention is connected to a fractured bone 1, the fractured bones 1 are referred to herein as the fractured left bone and the fractured right bone. After the trunk portion 2 has fully entered the medullary cavity, the tail portion 3 is secured to the bone 1. Specifically, the trunk portion 2 is positioned within the medullary cavity of the fractured left and right bones, connecting them, and the tail portion 3 is secured to the fractured right bone.

[0034] In the trunk 2 located in the bone marrow cavity, its abdomen 2a and back 2b both press against the crack of the broken bone 1. In detail, the raised abdomen 2a presses against the lower inner wall of the bone marrow cavity of the broken left bone and the broken right bone, and the flat back 2b presses against the upper inner wall of the bone marrow cavity of the broken left bone and the broken right bone. Since the abdomen 2a and back 2b press against the upper and lower inner walls of the bone marrow cavity respectively, there is a large friction between the trunk 2 and the inner wall of the bone marrow cavity, making it difficult for the broken left bone and the broken right bone to move relative to the trunk 2, so that the broken left bone and the broken right bone can be connected together through the trunk 2.

[0035] The bone plate of the present invention has the following advantages over the prior art:

[0036] First, because the back 2b is a flat plane under normal conditions, and the abdomen 2a is bulging 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 the bone marrow cavity at the rib fracture, Figure 4 As 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, while also increasing the strength of the trunk 2 to prevent excessive deformation of the trunk 2. In addition, the back 2b can provide a large and stable support surface for the broken bone 1, effectively and evenly dispersing the stress of the bone plate during reciprocating deformation, avoiding stress concentration, and the bone plate is not easily broken due to long-term deformation caused by human breathing, thereby better maintaining the normal shape of the bone 1 and promoting 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 higher strength. When the bone plate of the present invention is used to connect the fracture site at the knee, such as Figure 5 As shown, the trunk 2 is not easily deformed even when it is under pressure for a long time. 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 easy to move in the bone marrow cavity, thereby ensuring the supporting effect of the trunk 2. Therefore, the bone plate of the present invention can be used for connecting broken bones in human ribs, arms, hip joints, legs, etc.

[0037] Secondly, because the cross-section of the trunk 2 is an inverted triangle, the trunk 2 partially blocks 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 nutrients in the bone marrow cavity to flow freely, which helps to recover the broken bone 1.

[0038] Thirdly, the bone plate of the present invention is because the abdomen 2a and back 2b of the trunk 2 all abut against the inner wall of the medullary cavity, and the abdomen 2a and back 2b all abut against the crack of the bone 1, and the abdomen 2a and back 2b respectively abut against the inner walls of the opposite sides of the medullary cavity, the contact area between the abdomen 2a and back 2b and the inner wall of the medullary cavity is large, and the friction between the abdomen 2a and back 2b and the inner wall of the medullary cavity is large, resulting in that the trunk 2 is not easy to move in the radial direction of the medullary cavity, and the fracture end is not easy to rotate or shift laterally. In order to prevent the trunk 2 from moving in the axial direction of the medullary cavity, it is necessary to fix the tail 3 on the bone 1. The tail 3 has only one fixed point, that is, at least only one screw 6 is required, so 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 surgery.

[0039] The bone plate of the present invention has various technical features, such as the material of the plate and the shape of the tail portion 3, that can be implemented in various ways. Below, a detailed description of each of these technical features, including the material of the plate, will be given of one embodiment. This embodiment will be referred to as the present embodiment. Other embodiments of the various features, such as the material of the plate, are referred to as other embodiments, which are briefly described below.

[0040] In the prior art intramedullary fixation bone plates, since the plates are usually made of metal materials, many of them need to be removed after the bone 1 has repaired itself. However, if the intramedullary fixation bone plate is removed after the broken bone 1 has healed, the removal operation is relatively complicated. Because the bone plate is located in the medullary cavity, the soft tissue near the bone 1 needs to be cut again to expose the bone 1 again during removal. In addition, care must be taken during the removal process to avoid causing unnecessary damage to the tissues surrounding the bone 1.

[0041] Therefore, in this embodiment, both the trunk 2 and the tail 3 are made of degradable materials. There are many types of degradable materials. For example, the bone plates of the present invention can be made of silk protein, which is degradable and has excellent mechanical and physical and chemical properties, such as good flexibility and tensile strength, air and moisture permeability, and sustained release. The bone plates 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 composites of polylactic acid (PLA) and its copolymer (PLA / PCLA). By configuring the bone plates of the present invention to be made of degradable materials, the plates automatically degrade after the broken bone 1 heals. This eliminates the need for further surgery to remove the plates, reducing the possibility of secondary injury. In other embodiments, the bone plates of the present invention can also be made of medical implant materials with good compatibility with the human body, such as TC4 titanium alloy, stainless steel, PEEK, etc. These materials remain in the human body after implantation and do not need to be removed.

[0042] In the prior art intramedullary fixation bone plate, the flat plate intramedullary fixation bone plate 5 is mostly implanted into the body from the proximal side of the bone during the implantation process, such as Figure 1 As shown in the figure, when the bone at the knee is broken, the flat plate type intramedullary fixation plate 5 is usually implanted into the fracture near the knee from the knee joint, so it will cause damage to the knee joint 7, and the trauma is relatively large. When the trunk 2 of the bone plate of the present invention enters the medullary cavity, if it is also implanted into the medullary cavity from the knee joint 7, it will also cause the defect of relatively large trauma. At the same time, the traditional flat plate type intramedullary fixation plate 5 is usually made of metal material. During the implantation process, it is harder, thereby damaging the medullary cavity and causing medullary cavity bleeding. If hemostasis is not thorough, hematoma may be formed, increasing the risk of infection. In addition, the flat plate type intramedullary fixation plate 5 of most metals is prone to cause rejection reaction.

[0043] In order 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 the side wall opening of the bone 1, and the tail 3 is fixed to the outer wall of the bone 1. For ease of understanding, this embodiment takes the fracture of the knee joint 7 as an example. During the operation, the bone plate of the present invention is Figure 5 As shown, first, a surgical hole connecting the medullary cavity is opened on the side wall of the fractured right bone, and then the trunk 2 is moved away from the tail 3 toward the surgical hole, driving the trunk 2 into the medullary cavity. Since the trunk 2 is elastic, it deforms during the process of entering the medullary cavity, so that the trunk 2 can smoothly enter the medullary cavity. Because the trunk 2 of the present invention is elastic, and since the trunk 2 enters the medullary cavity from the side of the fractured bone 1, when the bone plate of the present invention is connected to the fractured bone at the knee, damage to the knee joint 7 is effectively avoided, and the surgical hole is arranged near the tail 3, so that the surgical wound is smaller. At the same time, since the trunk 2 is elastic, during the process of the trunk 2 entering the medullary cavity, unlike the flat-plate intramedullary fixation bone plate 5 made of metal material in the prior art, the specifically elastic trunk 2 is not easy to cause damage to the inner wall of the medullary 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.

[0044] In this embodiment, if Figures 2 to 5 As shown, the tail 3 is provided with a fixing hole 8, and a screw 6 is set to pass through the fixing hole 8 to fix the tail 3 to the outer wall of the bone 1. In this embodiment, the screw 6 is also made of silk protein. The present invention facilitates the further fixation of the bone plate of the present invention by setting the fixing hole 8, 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, ensuring that the fracture site is always in a stable fixed state during the healing process, and creating favorable conditions for the patient's recovery. In other embodiments, a slot can also be set on the outer wall of the bone, and a block can be set on the tail 3, and the tail 3 can be fixed to the outer wall of the bone 1 by matching the block and slot.

[0045] In this embodiment, both the trunk portion 2 and tail portion 3 are integrally formed from silk protein. Silk protein exhibits excellent mechanical and physical and chemical properties, such as flexibility and tensile strength, breathability and moisture permeability, and sustained release. Silk protein degrades within the bone marrow cavity, and the degraded substances are primarily amino acids, which can be absorbed and utilized by the human body. Silk protein also exhibits excellent biocompatibility, significantly reducing the immune system's rejection of implants. Medical devices made from silk protein can significantly improve the comfort and safety of patients during postoperative recovery. By integrally forming both the trunk portion 2 and tail portion 3 from silk protein, the present invention facilitates the manufacture of the bone plate, enabling integrated molding through methods such as 3D printing and casting. The use of silk protein also renders the trunk portion 2 biodegradable and elastic. In other embodiments, the trunk portion 2 and tail portion 3 can be composed of metal-based biodegradable materials, such as magnesium-based alloys and zinc-based alloys, as well as polylactic acid (PLA) and its copolymer (PLA / PCLA). During the bone plate fabrication process, polylactic acid (PLA) can be coated onto a metal-based biodegradable material. Metal-based biodegradable materials are primarily used to enhance plate strength. While PLA is elastic, it is less elastic than silk protein. During the degradation process of PLA and metal-based biodegradable materials, PLA and its copolymer (PLA / PCLA), formed by the polymerization of lactic acid monomers, degrade into lactic acid (a natural metabolite in the body, metabolized by the liver into CO2 and H2O). PLA and its copolymer (PLA / PCLA) degrade into acid, while metal-based biodegradable materials such as zinc alloys degrade into alkalinity. Thus, the acid-base balance neutralizes the degradation of PLA and metal-based biodegradable materials. However, their preparation process, mechanical properties, and degradation performance are inferior to those of plates made from silk protein.

[0046] In this embodiment, if Figures 2 to 5As shown. The bone fracture plate of the present invention also includes a guide portion 4, which is usually configured to be in the shape of a slender rod, and the guide portion 4 can also be configured to be in the shape of a vertebral body. The guide portion 4 and the tail portion 3 are respectively arranged on opposite sides of the trunk 2. The guide portion 4, the trunk 2 and the tail portion 3 are all made of silk protein in one piece. The bone fracture plate composed of the trunk 2, the tail 3 and the guide portion 4 can change the size of each part such as the trunk 2 according to the implantation site to meet the implantation requirements of different positions. Through the provision of the guide portion 4, the guide portion 4 and the trunk 2 enter the bone fracture cavity in sequence during the implantation of the bone fracture plate of the present invention into the bone marrow cavity. In this process, since the bone marrow cavity is not a cavity, and there are red bone marrow and yellow bone marrow inside it, and the intramedullary environment is complex, the provision of the guide portion 4 plays a guiding role in the process of the trunk 2 entering the bone marrow cavity, opens up a path for the trunk 2 to move in the bone marrow cavity, and assists the trunk 2 to be accurately implanted into the bone marrow cavity. In this embodiment, the guide portion 4 enters the bone marrow cavity through the surgical hole on the side wall of the bone 1. In other embodiments, the present bone plate may not be provided with the guide portion 4 when fixing fractures in uncomplicated bone marrow environments, such as when the marrow cavity is free of bone debris or other debris. Furthermore, in other embodiments, the guide portion 4, the trunk portion 2, and the tail portion 3 may all be made of a metal-based biodegradable material, polylactic acid (PLA), and its copolymer (PLA / PCLA). Furthermore, in other embodiments, the guide portion 4 may be inserted into the marrow cavity from the proximal end of the bone.

[0047] In this embodiment, if Figure 2 and Figure 3 As shown, the tail portion 3 of the bone plate of the present invention is in the shape of a fishtail, and the thickness of the tail portion 3 gradually decreases as it moves away from the trunk 2. The tail portion 3 is arranged in an arc shape, with the arc opening of the tail portion 3 facing one side of the abdomen 2a. Since the tail portion 3 is also made of silk protein, the tail portion 3 can be wrapped around the outer surface of the skeleton 1 based on its elasticity. The fishtail-shaped tail portion 3 has two advantages. One is that the area of the tail portion 3 is large, which is conducive to the fixation of the tail portion 3 to the outer wall of the skeleton 1. The second is that the thickness of the tail portion 3 away from the end of the trunk 2 is thinner, which reduces the impact on the soft tissue near the skeleton 1 and reduces the possibility of the notch phenomenon. In other embodiments, the tail portion 3 can also be arranged in a thin sheet shape, which can further reduce the possibility of the notch phenomenon, but the tail portion 3 needs to be made of other degradable materials to ensure the fixing strength of the tail portion 3.

[0048] In this embodiment, if Figures 2 to 5 As shown, the guide portion 4 is provided in the shape of a spiral rod. By providing the spiral rod-shaped guide portion 4, the present invention enables the guide portion 4 to effectively guide the trunk portion 2 precisely along the medullary cavity during implantation of the bone plate. This significantly reduces the risk of implant deviation due to irregularities in the medullary cavity, ensures that the trunk portion 2 smoothly reaches the predetermined position, and fully utilizes the guiding function of the guide portion 4. In other embodiments, the guide portion 4 may also be provided in a conical shape.

[0049] To further facilitate the advancement of the guide portion 4 in the medullary cavity, and because the environment in the medullary cavity is complex, in the prior art, the end of the guide portion 4 away from the trunk 2 is usually sharp. However, it is precisely this sharp structure that causes the risk of the sharp head piercing the ribs or joints during actual surgical operations.

[0050] Therefore, in this embodiment, if Figures 2 to 5 As shown, the end of the guide portion 4 facing away from the trunk 2 is blunted. By blunting the guide portion 4 and utilizing elastic silk protein to provide the guide portion 4 with guiding capabilities, the present invention significantly reduces the likelihood of puncturing the bone 1. In other embodiments, a retractable sleeve may be provided in the guide portion 4, with the end of the guide portion 4 facing away from the trunk 2 being sharpened. However, if the resistance encountered by the guide portion 4 exceeds a set value, the rod with the sharpened tip retracts into the sleeve, similarly preventing the bone 1 from being punctured.

[0051] In this embodiment, if Figures 2 to 5 As shown, the trunk 2 is strip-shaped, and the radial cross-sectional area of the trunk 2 gradually decreases from the middle toward the guide portion 4 and the tail 3. Therefore, the bone plate of the present invention, which is composed of the guide portion 4, the trunk 2, and the tail 3, adopts a bionic design in the shape of a narwhal. Through the provision of the guide portion 4 and the structural construction of the trunk 2, the bone plate of the present invention can not only effectively drive the trunk 2 to advance precisely along the medullary cavity during implantation, reducing the risk of implant deviation caused by irregularities in the medullary cavity, but also greatly reduce the resistance of the trunk 2 to implantation into the medullary cavity. In other embodiments, the radial cross-sectional area of each portion of the trunk 2 can also be set to be the same. This can enhance the connection strength of the bone plate of the present invention, but relatively speaking, the implantation difficulty of the trunk 2 is increased.

[0052] In this embodiment, if 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 transition smoothly. The radial cross-sectional area of the trunk 2 is much larger than the cross-sectional area of the tail 3. Therefore, if the connection between the trunk 2 and the tail 3 does not adopt a smooth transition, the strength of the connection between the trunk 2 and the tail 3 will be low. When the bone plate of the present invention is implanted in the ribs, the reciprocating motion of the ribs caused by human breathing will cause fatigue fracture of the connection between the trunk 2 and the tail 3. Therefore, the present invention sets a smooth transition between the outer surface of the trunk 2 and the outer surface of the tail 3, so that the outer surface of the connection between the trunk 2 and the tail 3 is arc-shaped. The arc-shaped connection greatly increases the fatigue strength of the connection between the trunk 2 and the tail 3, and reduces the probability of the trunk 2 and the tail 3 breaking each other. At the same time, the trunk 2 and the tail are streamlined as a whole, which is convenient for the implantation of the trunk 2. Furthermore, because the outer surface of the trunk portion 2 is streamlined and its radial cross-sectional area gradually decreases from the middle portion toward the guide portion 4, the end of the trunk portion 2 distal to the tail portion 3 forms a streamlined tip, allowing the trunk portion 2 to enter the bone marrow cavity more smoothly. In other embodiments, if the bone plate is made of polylactic acid (PLA) and its copolymer (PLA / PCLA) and a metal-based biodegradable material, the shape of the connection between the trunk portion 2 and the tail portion 3 can be arbitrarily configured, as the metal-based biodegradable material has a certain fatigue strength.

[0053] In summary, the bone plate of the present invention, by configuring the trunk portion 2 to consist of a raised abdomen 2a and a flat back portion 2b, is less susceptible to fracture and less prone to rotation or lateral displacement of the fractured ends. It can be used to connect multiple fractured bones 1 in the human body, such as ribs. Furthermore, the bone plate of the present invention requires only a single fixing point to secure the plate, thus minimizing trauma to the human body. Furthermore, the trunk portion 2 does not completely block the bone marrow cavity, facilitating the free flow of nutrients within the cavity. By making both the trunk portion 2 and the tail portion 3 from degradable materials, damage to the soft tissue near the bone 1 during a secondary surgery is avoided. By providing the trunk portion 2 with elasticity, damage to other parts of the body, such as the knee joint 7, is avoided, and the trunk portion 2 is less likely to damage the inner wall of the bone marrow cavity during implantation. By integrally molding the trunk portion 2 and tail portion 3 from silk fibroin, the bone plate of the present invention is easy to manufacture, and the trunk portion 2 is degradable and elastic. Furthermore, the provision of the guide portion 4 facilitates the precise implantation of the trunk portion 2 into the bone marrow cavity. By setting the tail 3 of the bone plate in a fishtail shape, the probability of notching is reduced. And by setting the fixing hole 8, the further fixation of the bone plate of the present invention is facilitated. And by setting the guide part 4 in a spiral rod shape, the trunk 2 is effectively guided to move accurately along the medullary cavity. And by passivating the guide part 4, the occurrence of puncturing the bone 1 is greatly reduced. And by setting the radial cross-sectional area of the trunk 2 to gradually decrease from the middle toward the guide part 4 and the tail 3, the resistance of the trunk 2 to implantation in the medullary wall is reduced. And by setting a smooth transition between the outer surface of the trunk 2 and the outer surface of the tail 3, the probability of the trunk 2 and the tail 3 breaking each other is effectively reduced.

[0054] It should be emphasized that the above are only preferred embodiments of the present invention and do not constitute any form of limitation to the present invention. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A bone plate for connecting fractured bones (1), characterized in that: The invention comprises a trunk (2) and a tail (3) connected to one end of the trunk (2), wherein the trunk (2) comprises a raised belly (2a) and a flat back (2b) connected to the belly (2a); the trunk (2) is implanted in 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 the belly (2a) and the back (2b) both abut against the crack of the bone (1).

2. The bone plate according to claim 1, characterized in that The trunk (2) and the tail (3) are both made of degradable 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) from a hole in 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, characterized in that The trunk (2) and the tail (3) are both made of silk protein in one piece.

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

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

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

8. The bone plate according to claim 7, characterized in that The end of the guide portion (4) away from the trunk portion (2) is passivated.

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 portion toward the guide portion (4) and the tail portion (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) transitions smoothly with the outer surface of the tail (3).

Images