Degradable bone peg

Abstract

The present application relates to a kind of degradable bone nail, including nail body, nail body top is equipped with nail cap: frame for increasing the strength of nail body is embedded in nail body, nail body and nail cap are integrated structure.Bone nail is integrally degradable material, by the frame arranged in bone nail, the strength of bone nail is improved.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a biodegradable bone screw. Background Technology

[0002] Bone screws are commonly used orthopedic implants for fixation during orthopedic surgery. For example, they are frequently used to fix internal fractures or dislocations by directly inserting two different bone fragments or fixing plates to achieve fracture fixation, locate the bone, and promote healing. Bone screws have a wide range of applications, including major areas such as the shoulder, elbow, epiphysis, knee, and spine.

[0003] Absorbable bone screws are convenient to use and do not require a second surgery. However, existing absorbable bone screws suffer from insufficient strength. Summary of the Invention

[0004] To address the aforementioned problems, the purpose of this invention is to provide a biodegradable bone nail, which is made entirely of biodegradable material and has an internal frame to enhance its strength.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A biodegradable bone screw includes a screw body, a screw head at the top of the screw body, and a frame embedded in the screw body to increase the strength of the screw body. The screw body and the screw head are an integral structure, and the screw body, the screw head and the frame are all made of biodegradable materials.

[0007] Preferably, the main body of the nail is a cylinder, and the bottom of the nail is a cone.

[0008] Preferably, the main body of the nail is provided with threads.

[0009] Preferably, the thread is located at the lower part of the nail body.

[0010] Preferably, the nail head is provided with a groove for engaging with a wrench.

[0011] Preferably, the slot is an H-shaped groove.

[0012] Preferably, the frame is a mesh ring structure, comprising multiple longitudinal uprights and multiple transverse rings, with the uprights evenly distributed inside the rings to form the mesh ring structure.

[0013] Preferably, the multiple transverse rings are spaced equally apart.

[0014] Preferably, the frame is made of a magnesium alloy that is biodegradable in the human body.

[0015] Preferably, the nail body and the nail head are made of hydroxyapatite, which is biodegradable in the human body.

[0016] The present invention has the following advantages due to the adoption of the above technical solutions:

[0017] 1. The biodegradable bone nail provided by the present invention improves the strength of the bone nail by setting a frame inside the nail body.

[0018] 2. The biodegradable bone nail provided by this invention has an H-shaped groove on the nail head, which, together with the wrench with an H-shaped port, provides better limiting effect and improves the anti-disengagement performance during the tightening process. Attached Figure Description

[0019] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts. In the drawings:

[0020] Figure 1 This is a perspective structural diagram of a biodegradable bone nail according to an embodiment of the present invention.

[0021] Figure 2 This is a front view of the biodegradable bone nail provided in this embodiment of the present invention.

[0022] Figure 3 This is a top view of the biodegradable bone nail provided in this embodiment of the present invention.

[0023] Figure 4 This is the main view of the framework of this embodiment of the present invention.

[0024] Figure 5 This is a top view of the framework of this embodiment of the present invention.

[0025] The markings in the attached diagram are as follows:

[0026] 1 is the nail body, 2 is the nail head, 3 is the frame, 301 is the upright, 302 is the ring, 4 is the thread, 5 is the slot, 501 is the vertical slot, 502 is the horizontal slot, and 6 is the transition surface. Detailed Implementation

[0027] Exemplary embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the invention and to fully convey the scope of the invention to those skilled in the art.

[0028] The biodegradable bone nail provided by this invention is made entirely of biodegradable material. By setting a frame inside the bone nail, the strength of the bone nail is improved.

[0029] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0030] Example

[0031] The biodegradable bone nail provided in this embodiment, such as Figure 1 and Figure 2 As shown, the device includes a nail body 1, the main body of which is cylindrical, and the bottom of the nail body 1 is conical with a pointed tip, which facilitates the drilling of the bone nail into the bone. The top of the nail body 1 is provided with a nail head 2, which is rectangular in structure. A transition surface 6 is provided between the bottom surface of the nail head 2 and the top surface of the nail body 1, which increases the strength of the connection between the nail body 1 and the nail head 2. The nail body 1, nail head 2 and frame 3 are all made of biodegradable materials.

[0032] When the wrench is applied to the nail head 2 and the bone nail is tightened, the transition surface 6 between the bottom surface of the nail head 2 and the top surface of the nail body 1 reduces the risk of breakage between the nail head 2 and the nail body 1 during the tightening process.

[0033] The nail body 1 has a frame 3 embedded inside, which increases the strength of the nail body 1 and thus improves the stability of bone fixation.

[0034] The nail body 1 and nail head 2 are integrally molded, which improves the rigidity of the bone screw. Both nail body 1 and nail head 2 are made of biodegradable materials, used for fracture fixation, and can be absorbed by the body, becoming part of the human skeleton. Specifically, the biodegradable material is hydroxyapatite, commonly known as artificial bone.

[0035] In this embodiment, the main body of the nail body 1 is provided with threads 4, specifically, the threads 4 are located at the lower part of the main body of the nail body. Through the threads 4, the bone nail can be drilled into the bone more easily.

[0036] In this embodiment, such as Figure 3 As shown, the nail head 2 is provided with a slot 5 for cooperating with a wrench. The slot 5 is an H-shaped groove, which includes two vertical grooves 501 and a horizontal groove 502. The two vertical grooves 501 are located at both ends of the horizontal groove 502. The H-shaped groove has a better limiting effect. When used with a wrench with an H-shaped port, the wrench is not easy to slip out of the nail head 2.

[0037] Furthermore, the depth of the vertical grooves 501 at both ends of the H-shaped groove is greater than the depth of the horizontal groove 502 in the middle of the H-shaped groove. When the end of the wrench is inserted into the H-shaped groove, the anti-dislodgement performance of the wrench is further improved.

[0038] Furthermore, the width of the vertical grooves 501 at both ends of the H-shaped groove is smaller than the width of the horizontal groove 502 in the middle of the H-shaped groove, which further improves the wrench's anti-dislodgement performance.

[0039] In this embodiment, such as Figure 4 and Figure 5 As shown, frame 3 is a mesh ring structure, including multiple longitudinal uprights 301 and multiple transverse rings 302. The uprights 301 are evenly distributed on the inner side of the rings 302 and are in contact with the inner wall of the rings 302 to form a mesh ring structure. In specific applications, the uprights 301 are fixedly connected to the inner wall of the rings 302 by welding.

[0040] Furthermore, the outer diameter of the ring 302 is slightly smaller than the outer diameter of the main body of the nail body 1, which can better provide the strength of the nail body 1.

[0041] Furthermore, the multiple transverse rings 302 are equally spaced and evenly distributed within the nail body 1. In this embodiment, four rings 302 are arranged within the nail body 1.

[0042] In this embodiment, the upright 301 is a round rod with a diameter that is one-twenty-fourth of the outer diameter of the main body of the nail 1. This not only strengthens the fixation but also avoids the problem of difficulty in final degradation and decomposition due to excessive diameter, thus preventing a certain burden on the body.

[0043] In this embodiment, the upright 301 and the ring 302 are made of biodegradable materials. After the nail body 1 and nail head 2 of the bone nail are decomposed and absorbed by the human body, the upright 301 and the ring 302 degrade and separate in the human body.

[0044] In specific applications, the upright 301 and the ring 302 are made of metal, specifically, of biodegradable magnesium alloy. Biodegradable magnesium alloy can be absorbed and degraded by the human body and excreted through urine, and has no toxic side effects on the body.

[0045] The cross-section of ring 302 is rectangular. The thickness of ring 302 is one-twenty-fourth of the outer diameter of the main body of nail 1, and the difference between the inner and outer diameters is one-twelfth of the outer diameter of the main body. For example, the outer diameter of the main body of nail 1 is 12mm, the diameter of the upright 301 is 0.5mm, the thickness of ring 302 is 0.5mm, the outer diameter of ring 302 is 11.5mm, and the inner diameter is 10.5mm. Frame 3 increases the strength of the bone nail while controlling the magnesium alloy content.

[0046] Biodegradable bone nails made solely of hydroxyapatite are relatively weak and often fail to provide adequate fixation. In this embodiment, the biodegradable bone nail has a body 1 and a head 2 made entirely of hydroxyapatite, which promotes bone recovery while degrading. An internal frame 3 further enhances the nail's strength. The frame 3 is a mesh structure made of magnesium alloy, specifically a Mg-Zn-Ca-Y alloy. Compared to traditional metals, magnesium alloy has a density of 1.74 g / cm³. 3Compared to human bone mineral density of 1.75 g / cm³ 3 Essentially the same, its strength and fatigue resistance are much higher than hydroxyapatite, and its elastic modulus is closer to that of natural bone tissue compared to other metals. Traditional metal materials are not easily absorbed or degraded in the body, requiring secondary surgery for removal or long-term retention, which is detrimental to patient recovery. Ordinary biomedical metal materials release harmful ions when ionized or electrolyzed in the human body environment, or the friction between the metal material and bone tissue can produce debris that can cause sensitization, carcinogenicity, or other toxic side effects, and may even cause implanted metal materials to fail due to corrosion by body fluids. Therefore, frame 3 is made of magnesium alloy, which has high strength and is ultimately metabolized and excreted from the body in an ionic manner. If the entire bone nail were made of magnesium alloy, although magnesium ions can be degraded in the body without producing toxic side effects, an excessive magnesium alloy content would still put a certain burden on the body. Therefore, the frame 3 with the inner mesh ring structure of the bone nail in this example can both increase fixation strength and control the magnesium alloy content.

[0047] In this embodiment, when using the biodegradable bone screw, the end of a wrench is inserted into the groove 5 on the screw head 2. The bone screw is aligned with the area to be fixed, and the wrench is turned to screw the bone screw into the bone, completing the fixation. The screw body 1 and screw head 2 gradually decompose in the human body and are absorbed by the bones; after the screw body 1 and screw head 2 are absorbed, the frame 3 is degraded and absorbed within the body. The biodegradable bone screw in this example improves the strength of the bone screw by incorporating the frame 3 within the screw body 1. The H-shaped groove of the screw head 2, combined with the H-shaped wrench end, provides better limiting and improves the anti-disengagement performance during tightening.

[0048] The biodegradable bone screw used in this embodiment has a body 1 and a head 2 both made of hydroxyapatite (HA), a major inorganic component of human and animal bones and teeth with a Mohs hardness of 5. The frame 3 is made of magnesium alloy. Because hydroxyapatite dissolves quickly in the body and lacks sufficient strength, a magnesium alloy frame 3 is added inside the screw body to increase its strength and prevent it from degrading too quickly, thus facilitating patient recovery.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A biodegradable bone nail, characterized in that, The device includes a nail body, a nail head at the top of the nail body, and a frame embedded in the nail body to increase the strength of the nail body. The nail body and the nail head are an integral structure, and the nail body, nail head, and frame are all made of biodegradable materials. The frame is a mesh ring structure, including multiple longitudinal uprights and multiple transverse rings. The uprights are evenly distributed inside the rings to form the mesh ring structure. The upright is a round rod, and the diameter of the round rod is one twenty-fourth of the outer diameter of the main body of the nail. The cross-section of the ring is rectangular, the thickness of the ring is one twenty-fourth of the outer diameter of the main body of the nail, and the difference between the inner and outer diameters of the ring is one-twelfth of the outer diameter of the main body. The frame is made of a magnesium alloy that is biodegradable in the human body; The nail body and the nail head are made of hydroxyapatite, which is biodegradable in the human body.

2. The biodegradable bone screw according to claim 1, characterized in that, The main body of the nail is cylindrical, and the bottom of the nail is conical.

3. The biodegradable bone screw according to claim 2, characterized in that, The nail body has threads.

4. The biodegradable bone screw according to claim 3, characterized in that, The thread is located at the lower part of the main body of the nail.

5. The biodegradable bone screw according to claim 1, characterized in that, The nail head has a slot for engaging with a wrench.

6. The biodegradable bone screw according to claim 5, characterized in that, The slot is an H-shaped groove.

7. The biodegradable bone screw according to claim 1, characterized in that, The multiple transverse rings are spaced equally apart.

Images