Fracture fixing device
By designing a fracture fixation device with hollow screws and biodegradable components, the problems of infection and nonunion caused by existing fracture fixation devices are solved, achieving synergistic promotion of mechanical support and bone healing, and improving the fracture rehabilitation effect.
Patent Information
- Application Number
- CN202512054136.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-31
- Publication Date
- 2026-02-24
AI Technical Summary
Existing screw fixation devices may cause postoperative infection, bacterial growth, chronic inflammation and surrounding bone loss after long-term implantation, and lack the ability to actively promote fracture healing, resulting in nonunion or delayed healing. Excessive rigidity of mechanical fixation affects bone tissue regeneration.
A fracture fixation device was designed, which uses hollow screws and biodegradable components. The device connects to the fracture site through a rod and a fixation plate to provide mechanical support. During the bone healing process, the biodegradable components gradually degrade, releasing factors that are beneficial to bone repair, promoting blood vessel and bone tissue regeneration, while also inhibiting bacteria and inflammation and reducing the risk of infection.
It achieves the goals of providing mechanical support while promoting fracture healing, reducing the risk of infection, and improving fracture rehabilitation. The biodegradable components release beneficial factors to accelerate bone repair, reduce stress shielding, and improve patient comfort and implant durability.
Smart Images
Figure CN121549907A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of medical devices and discloses a fracture fixation device. Background Technology
[0002] In orthopedic surgery, screw fixation devices are commonly used to treat traumatic fractures such as femoral neck fractures. Existing screw fixation devices often use screws made of titanium alloy or stainless steel, which provide mechanical support. However, long-term implantation can lead to postoperative infections, bacterial growth, chronic inflammation, and surrounding bone loss. Furthermore, screw fixation devices lack the ability to actively promote fracture healing, potentially causing nonunion or delayed healing. Excessive mechanical rigidity can also cause stress shielding, hindering bone regeneration. Therefore, there is an urgent need for a fracture fixation device that can better promote bone healing and recovery. Summary of the Invention
[0003] The purpose of this invention is to provide a fracture fixation device to solve one or more technical problems existing in the prior art, and at least provide a beneficial option or create conditions.
[0004] According to a first aspect of the present invention, a fracture fixation device includes: a screw, comprising a shaft and a screw head connected to one end of the shaft, the shaft being a hollow structure, the screw head having an opening communicating with the interior of the shaft, and the outer side of the shaft having a communicating hole communicating with the interior of the shaft; a biodegradable component disposed within the shaft, the biodegradable component being directly opposite the communicating hole; and a fixing plate having an mounting hole, the end of the shaft away from the screw head passing through the mounting hole.
[0005] This technical solution has at least the following beneficial effects: During use, the biodegradable component is inserted into the rod body through the opening, the fixation plate is placed close to the outer side of the bone, and the end of the rod body furthest from the screw head is passed through the mounting hole and implanted into the fracture site. The rod body connects and fixes the fracture sites together, providing mechanical support. The screw head rests against the fixation plate, which disperses the stress on the bone caused by the screw head, improving support stability. During bone healing and rehabilitation, the biodegradable component gradually degrades, releasing factors beneficial to bone repair and healing, promoting blood vessel and bone tissue regeneration, and achieving antibacterial and anti-inflammatory effects, reducing the risk of infection. Thus, after implantation, the screw provides the necessary mechanical support, facilitating the connection and fixation of the fractured parts. Furthermore, the release of factors beneficial to bone repair and healing, as well as antibacterial and anti-inflammatory effects through the biodegradable component, better promotes bone healing and rehabilitation, improving the fracture recovery outcome.
[0006] According to some embodiments of the present invention, a plurality of the connecting holes are provided along the length direction of the rod, and the biodegradable component can move and be positioned inside the rod along the length direction of the rod.
[0007] According to some embodiments of the present invention, the present invention also includes a universal ball, the universal ball being provided with a channel, the universal ball being provided with a spherical surface surrounding the channel, the universal ball being embedded in the mounting hole, the spherical surface being in contact with the inner wall of the mounting hole, and the rod body passing through the channel.
[0008] According to some embodiments of the present invention, the included angle between the channel and the mounting hole is between 5 degrees and 30 degrees.
[0009] According to some embodiments of the present invention, a first threaded section is provided on the outer side of the end of the rod away from the screw head.
[0010] According to some embodiments of the present invention, a second threaded section is provided on the outer side of the end of the rod near the screw head.
[0011] According to some embodiments of the present invention, there are multiple mounting holes, multiple screws, and multiple rods respectively pass through multiple mounting holes.
[0012] According to some embodiments of the present invention, the surface of the biodegradable component is provided with a degradation rate regulating layer.
[0013] According to some embodiments of the present invention, the biodegradable component is pure magnesium, magnesium alloy, or zinc alloy.
[0014] According to some embodiments of the present invention, a sensor is provided inside the shaft, the sensor being used to monitor the positional state of the shaft.
[0015] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description
[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly explained below. Obviously, the described drawings are only a part of the embodiments of the present invention, and not all of them. Those skilled in the art can obtain other design schemes and drawings based on these drawings without creative effort.
[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention in use.
[0018] Figure 2 This is a schematic diagram of the screw structure of the present invention.
[0019] Figure 3 yes Figure 2 A schematic diagram of the AA cross-sectional structure.
[0020] Figure 4This is a schematic diagram of the universal ball structure of the present invention.
[0021] In the attached diagram: 100-screw, 110-rod body, 111-connecting hole, 112-first threaded section, 113-second threaded section, 120-screw head, 200-fixing plate, 300-ball joint, 310-channel, 400-biodegradable part. Detailed Implementation
[0022] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.
[0023] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.
[0024] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.
[0025] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.
[0026] In the description of this application, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0027] In the description of this application, the use of terms such as "one embodiment," "some embodiments," "an example," "some instances," "some embodiments," "illustrative embodiment," "example," "specific example," "some examples," etc., indicates that the specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0028] Reference Figures 1 to 3 According to a first aspect of the present invention, a fracture fixation device includes a screw 100, a biodegradable component 400, and a fixation plate 200. The screw 100 includes a shaft 110 and a screw head 120 connected to one end of the shaft 110. The shaft 110 has a hollow structure. The screw head 120 has an opening communicating with the interior of the shaft 110. A connecting hole 111 communicating with the interior of the shaft 110 is provided on the outer side of the shaft 110. In practical applications, the shaft 110 and the screw head 120 are integrally formed, thus directly forming the opening on the screw head 120 and the hollow structure inside the shaft 110. The biodegradable component 400 is disposed within the shaft 110, directly opposite the connecting hole 111. The fixation plate 200 has an installation hole, through which the end of the shaft 110 away from the screw head 120 passes.
[0029] As described above, in use, the biodegradable component 400 is inserted into the rod body 110 through the opening, the fixation plate 200 is placed close to the outside of the bone, and the end of the rod body 110 away from the screw head 120 is passed through the mounting hole and implanted into the fracture site. The rod body 110 is used to connect and fix the fracture sites together, thereby providing mechanical support for the fracture site. The screw head 120 abuts against the fixation plate 200, and the fixation plate 200 disperses the stress generated by the screw head 120 on the bone, improving the stability of the support. During the bone healing and rehabilitation process, the biodegradable component 400 gradually degrades, releasing factors that are beneficial to bone repair and healing, promoting blood vessel and bone tissue regeneration, and achieving antibacterial and anti-inflammatory effects, reducing the risk of infection. In this way, after the screw 100 is implanted into the bone, it can provide the necessary mechanical support, which is beneficial to the connection and fixation of the fracture site. Furthermore, the biodegradable component 400 releases factors that are beneficial to bone repair and healing, as well as antibacterial and anti-inflammatory effects, thereby better promoting bone healing and rehabilitation and improving the fracture rehabilitation effect.
[0030] In the above embodiment, there may be only one connecting hole 111. However, in order to improve the efficiency of the biodegradable component 400 in releasing healing factors to the fracture site through the connecting hole 111, in this embodiment, multiple connecting holes 111 are provided along the length direction of the rod 110. The biodegradable component 400 can move and be positioned inside the rod 110 along the length direction of the rod 110. Before use, the position of the biodegradable component 400 installed inside the rod 110 can be adjusted according to the fracture site, so that the biodegradable component 400 is directly opposite the multiple connecting holes 111 corresponding to the fracture site. The biodegradable component 400 can be positioned inside the rod 110 through an interference fit, or it can be positioned inside the rod 110 by snap-fit. During use, the biodegradable component 400 inside the rod 110 releases the drug more accurately through the multiple connecting holes 111 near the fracture site.
[0031] To improve the effect of the screw head 120 in pressing the fixation plate 200 tightly onto the bone, such as Figure 4 As shown, the present invention also includes a universal ball 300, which has a channel 310 and a spherical surface surrounding the channel 310. The universal ball 300 is embedded in the mounting hole, and the spherical surface fits against the inner wall of the mounting hole. The rod 110 passes through the channel 310. The universal ball 300 utilizes its spherical surface to fit against the inner wall of the mounting hole. During use, the universal ball 300 can be rotated relative to the inner wall of the mounting hole to adjust the angle of the screw passing through the channel 310, better adapting to different positions for implantation and accommodating the physiological activities of the femoral neck. In practical applications, the fixation plate 200 can change its shape according to different usage positions, thereby allowing the fixation plate 200 to better fit against the outer surface of the bone, dispersing the stress of the screw head 120 on the fixation plate 200, significantly reducing stress concentration, and thus improving the durability of the implant and patient comfort.
[0032] Furthermore, the angle formed between the channel 310 and the mounting hole is between 5 and 30 degrees. The omnidirectional ball 300 can move in multiple axes within this range of the mounting hole, thereby better adapting to the physiological activities of the femoral neck. In practical applications, the omnidirectional ball 300 can be made of titanium alloy or stainless steel, and a lubricating coating can also be applied to its surface to improve the smoothness of its movement.
[0033] In order to connect the rod body 110 to the fractured part, the rod body 110 has a connecting structure. Specifically, a first threaded section 112 is provided on the outer side of the end of the rod body 110 away from the screw head 120. When the rod body 110 is implanted into a part of the fracture, it is connected and fixed to the fractured part through the first threaded section 112, thereby pulling the fractured part tight to the fixation plate 200.
[0034] Furthermore, a second threaded section 113 is provided on the outer side of the end of the rod 110 near the screw head 120. The position of the rod 110 near the screw head 120 can be connected to the other part of the fracture through the second threaded section 113, thereby further securing the two fractured parts and improving the stability of the connection between them.
[0035] In some embodiments, there are multiple mounting holes and multiple screws 100, with multiple rods 110 passing through multiple mounting holes respectively. The multiple mounting holes on the fixing plate 200 provide positions for the screws 100 to pass through. Naturally, each of the multiple mounting holes also contains a ball joint 300. Depending on the usage requirements, screws 100 can be inserted into the corresponding mounting holes, allowing for the implantation of the fractured portion to be connected from different directions or angles, thus improving the flexibility of use.
[0036] To better control the degradation rate of the biodegradable component 400, in this embodiment, a degradation rate regulating layer is provided on the surface of the biodegradable component 400. In practical applications, the degradation rate regulating layer can be formed by micro-arc oxidation on the surface of the biodegradable component 400, or by treatment with a phosphate conversion coating or a polymer coating, forming a protective layer with a thickness of 5 μm to 50 μm. In use, the degradation rate regulating layer can regulate the degradation rate and has bioactivity that promotes bone tissue regeneration.
[0037] In some embodiments, the biodegradable component 400 is pure magnesium, a magnesium alloy, or a zinc alloy. The magnesium alloy includes Mg-Zn alloys or Mg-Ca alloys, and the zinc alloy includes Zn-Mg alloys or Zn-Ca alloys. During use, the biodegradable component 400 releases magnesium or zinc ions, hydrogen gas, and hydroxide ions. Magnesium ions accelerate bone tissue regeneration and local angiogenesis by regulating growth factor expression, thus improving fracture healing speed. Furthermore, magnesium ions, hydrogen gas, and hydroxide ions effectively inhibit bacterial growth, reducing the risk of postoperative infection and inflammation. In practical applications, the biodegradable component 400 can be cylindrical, cubic, or conical, etc.
[0038] To better monitor the state of the implanted shaft 110, in this embodiment, a sensor is installed inside the shaft 110 to monitor its position. The sensor can monitor implant loosening or displacement in real time, reducing the risk of implant loosening and improving patient recovery. In practical applications, the sensor can be a stress or vibration sensor, encapsulated in silicone inside the screw 100, and transmit data wirelessly via Bluetooth or other wireless transmission methods.
[0039] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.
Claims
1. A fracture fixation device, characterized in that: include: The screw (100) includes a shaft (110) and a screw head (120) connected to one end of the shaft (110). The shaft (110) is a hollow structure. The screw head (120) is provided with an opening communicating with the interior of the shaft (110). The outer side of the shaft (110) is provided with a communicating hole (111) communicating with the interior of the shaft (110). A biodegradable component (400) is disposed inside the rod body (110), and the biodegradable component (400) is directly opposite the connecting hole (111). The fixing plate (200) has a mounting hole, and the end of the rod (110) away from the screw head (120) passes through the mounting hole.
2. The fracture fixation device according to claim 1, characterized in that: Multiple connecting holes (111) are provided along the length of the rod (110), and the biodegradable component (400) can move and be positioned inside the rod (110) along the length of the rod (110).
3. The fracture fixation device according to claim 1, characterized in that: It also includes a spherical ball (300), which is provided with a channel (310). The spherical ball (300) is provided with a spherical surface around the channel (310). The spherical ball (300) is embedded in the mounting hole. The spherical surface fits against the inner wall of the mounting hole. The rod body (110) passes through the channel (310).
4. The fracture fixation device according to claim 3, characterized in that: The angle between the channel (310) and the mounting hole is between 5 degrees and 30 degrees.
5. The fracture fixation device according to claim 1, characterized in that: The outer side of the end of the rod (110) away from the screw head (120) is provided with a first threaded section (112).
6. The fracture fixation device according to claim 5, characterized in that: The rod body (110) has a second threaded section (113) on the outer side of the end near the screw head (120).
7. The fracture fixation device according to claim 1, characterized in that: There are multiple mounting holes, multiple screws (100), and multiple rods (110) pass through multiple mounting holes respectively.
8. The fracture fixation device according to claim 1, characterized in that: The surface of the biodegradable component (400) is provided with a degradation rate regulating layer.
9. The fracture fixation device according to claim 1, characterized in that: The biodegradable component (400) is made of pure magnesium, magnesium alloy, or zinc alloy.
10. The fracture fixation device according to claim 1, characterized in that: A sensor is installed inside the shaft (110) to monitor the position of the shaft (110).