A high-strength ultrasonic roll-pressed outer thread degradable interface screw

Abstract

The utility model provides a kind of degradable interface screw of high-strength ultrasonic rolling outer thread, it is related to the field of orthopedic medical instruments, including screw column, the outer thread is arranged outside screw column, screw head is fixedly connected in screw column end part, screw tail is fixedly connected in the end of screw column away from screw head, transverse through slot is set in screw column center, guide hole is set in the both ends of screw column and is communicated with transverse through slot, the diameter of transverse through slot is greater than the diameter of guide hole, screw column side wall is set with several tooth root interstice being communicated with guide hole and transverse through slot, tooth root interstice is inclinedly arranged.The utility model is through setting inclined tooth root interstice, and the anchoring effect of interface screw in bone can be improved by inclined design, and inclined hole can guide bone tissue to grow along inclined trajectory, form more reliable mechanical interlocking structure, improve pull-out resistance and torsional resistance, and transverse through slot optimizes stress distribution, avoids stress concentration around screw column, reduces the risk of bone resorption and interface failure.

Description

Technical Field

[0001] This utility model relates to the field of orthopedic medical devices, and more particularly to a biodegradable interface screw with high-strength ultrasonically rolled external threads. Background Technology

[0002] Interface screws are miniature devices commonly used in minimally invasive surgery, primarily in orthopedic implant surgeries. They are used to fix tendons, ligaments, and other soft tissues to bone tissue through compression. They are widely used in Achilles tendon repair, flexor digitorum longus tendon repair, anterior cruciate ligament repair, and lateral ligament reconstruction. A key characteristic of interface screws is the biodegradability of their material; they gradually degrade and are absorbed by the body over time, avoiding the need for secondary surgery and reducing patient pain and risks. Simultaneously, interface screws need sufficient strength and toughness to effectively fix bone tissue, maintain stability, and promote fracture healing and recovery. Furthermore, the surface morphology of interface screws must meet the biocompatibility requirements of human tissues to reduce post-implantation rejection and infection risks.

[0003] In published patents related to interface screws, such as patent documents CN214907953U, CN217447885U, and CN214907481U, the typical procedure involves drilling and tapping a hole in the bone tissue, inserting one end of a suture into the hole, screwing in the interface screw, and then connecting the other end of the suture to soft tissue, such as a ligament, to achieve the connection between the bone and soft tissue. The interface screw usually has central guide holes at both the head and tail to enhance the postoperative connection strength between the screw and the bone tissue. However, in actual use, while the interface screw maintains a certain degree of stability initially, the stability of the connection between the screw and the bone tissue is affected over time due to factors such as human movement.

[0004] Therefore, it is necessary to develop a high-strength ultrasonically rolled external thread biodegradable interface screw to improve the problem of insufficient stability of interface screws in the long term in the prior art. Utility Model Content

[0005] The purpose of this invention is to provide a high-strength ultrasonically rolled external thread biodegradable interface screw that optimizes stress distribution, avoids stress concentration around the screw post, reduces the risk of bone resorption and interface failure, and improves the problems existing in the prior art.

[0006] A biodegradable interface screw with high-strength ultrasonically rolled external threads includes a screw post, an external thread on the outer side of the screw post, a screw head fixedly connected to the end of the screw post, a screw tail fixedly connected to the end of the screw post away from the screw head, a transverse through groove in the center of the screw post, guide holes communicating with the transverse through groove at both ends of the screw post, and a number of root holes communicating with the guide holes and the transverse through groove on the sidewall of the screw post, the root holes being inclined.

[0007] More preferably, the diameter of the transverse through groove is larger than the diameter of the guide hole.

[0008] More preferably, the external thread on the outer side of the screw post includes a tooth crest on the protruding part and a tooth root on the concave part. The tooth crest surface is the outermost tooth crest surface retained during the process of turning an interface screw after ultrasonically rolling a 99.9% to 99.999% pure magnesium rod. The concave part is obtained after the ultrasonically rolled surface is removed during the turning process. The tooth root hole is located at the tooth root.

[0009] More preferably, the tooth bottom hole is inclined from the tooth bottom towards the screw tail.

[0010] More preferably, the screw head has a hexagonal bolt through hole that communicates with the guide hole and the transverse through groove.

[0011] Compared with the prior art, the present invention has the following advantages:

[0012] This invention features an inclined hole at the base of the screw. This inclined design improves the anchoring effect of the screw in the bone. When the screw post is tightened, the inclined hole guides bone tissue to grow along the inclined trajectory, forming a more robust mechanical interlocking structure, improving pull-out and torsional resistance, and promoting long-term fixation stability. The inclined design also optimizes the stress distribution inside and around the screw post, reducing stress concentration and preventing local bone damage due to excessive stress, thus helping to reduce complications such as osteonecrosis or screw loosening. The inclined hole better adapts to the natural growth direction of bone tissue, promoting bone cells to penetrate deeper into the screw along the hole and accelerating the osseointegration process.

[0013] This invention optimizes stress distribution by setting the diameter of the transverse groove to be larger than that of the guide hole. This special design avoids stress concentration around the screw post, reduces the risk of bone resorption and interface failure, and the larger diameter of the transverse groove facilitates the flow of blood and nutrients, promotes angiogenesis, helps bone cells and soft tissues grow into the hole, accelerates the biological fixation of the interface, and enhances long-term stability. At the same time, the larger diameter of the transverse groove can reduce the weight of the screw post, reduce material usage, and to some extent increase the flexibility of the screw post, reducing the possibility of breakage under load.

[0014] This invention uses pure magnesium material with a purity of 99.9% to 99.999% after ultrasonic rolling, which can enhance the strength, toughness, and suitable corrosion resistance of the interface screw itself, while promoting the ingrowth of surrounding bone tissue and strengthening the stability of the patient's tendons and bones, thereby improving stability. In addition, pure magnesium with a purity of 99.9% to 99.999% can effectively control the absorption of unnecessary elements by the human body, and its suitable corrosion resistance allows it to gradually degrade during the wound healing process, avoiding the need for secondary surgery.

[0015] The interface screw features a central guide hole and a transverse groove, a novel design that provides a more reliable and effective solution for orthopedic surgery. During the procedure, the central guide hole and transverse groove can accommodate the patient's autologous cancellous bone, thereby increasing the contact area between the tendon and the bone tunnel. This design not only helps accelerate tendon-bone healing time but also improves post-healing structural stability. By embedding autologous cancellous bone into the central guide hole and transverse groove, the contact area between the tendon and the bone tunnel is effectively increased, thus promoting biomechanical interaction during the healing process. This innovative design can shorten tendon-bone healing time, increase post-healing structural stability, and reduce surgical risks and complications.

[0016] The external thread root portion of the interface screw body is obtained by removing the ultrasonically rolled surface during machining, and several pores are drilled at the root leading to a central guide hole and transverse through grooves. The perforated interface screw has a unique structure; its threads are located on the periphery of the overall interface screw, ensuring a firm connection between the threads and the overall interface screw. The perforation design allows the thread surface to connect with both sides of the patient's bone, effectively preventing the interface screw from shifting. This innovation not only improves the overall usability of the interface screw but also provides a more reliable solution for fixation operations in orthopedic surgery. The pure magnesium perforated structure in this design not only reduces the weight of the screw and the burden on the bone but also promotes the growth and healing of surrounding bone tissue. Compared to traditional solid screws made of other materials, the perforated pure magnesium interface screw better promotes the biomechanical integration of bone and screw, improving postoperative stability and patient recovery speed. Furthermore, by placing the threads on the periphery, the contact area between the interface screw and surrounding bone tissue is increased, further improving the fixation effect. The thread design not only strengthens fixation but also facilitates screw insertion during surgery, reducing surgical time and patient discomfort.

[0017] In summary, this innovative perforated interface screw not only solves the problem of displacement during traditional screw fixation, but also improves the safety and success rate of surgery, bringing new breakthroughs and progress to the field of orthopedic surgery. Attached Figure Description

[0018] Figure 1 This is the front view of the present invention.

[0019] Figure 2 This is a three-dimensional structural diagram of the present invention.

[0020] Figure 3 This is the right view of the present invention.

[0021] Figure 4 This is the left view of the present invention.

[0022] Figure 5 This is a cross-sectional planar structural diagram of the present invention.

[0023] Figure 6 This is a cross-sectional three-dimensional structural diagram of the present invention.

[0024] Reference numerals: 1. Screw post; 2. Screw head; 21. Hex bolt through hole; 3. Screw tail; 4. Transverse through slot; 5. Guide hole; 6. Thread root hole. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. Unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by those skilled in the art to which this utility model pertains. The terms "comprising" and similar expressions used herein mean that the element or object preceding the word covers the element or object listed following the word and its equivalents, but does not exclude other elements or objects.

[0026] This utility model provides a high-strength ultrasonically rolled external thread biodegradable interface screw, including a screw post 1. The screw post 1 has external threads on its outer side, which increases the contact area between the screw post 1 and the surrounding bone tissue, improves the fixation effect, and makes it easier to implant the screw post 1 during surgery, reducing operation time and patient pain. A screw head 2 is fixedly connected to the end of the screw post 1, and a screw tail 3 is fixedly connected to the end of the screw post 1 away from the screw head 2. A transverse through groove 4 is opened in the center of the screw post 1, and guide holes 5 communicating with the transverse through groove 4 are opened at both ends of the screw post 1. The diameter of the transverse through groove 4 is larger than the diameter of the guide hole 5. This design can provide better guidance and positioning functions, which helps to ensure the accuracy and stability of the screw during the implantation process. The transverse groove 4 increases the contact area between the screw and the surrounding bone tissue, further improving the fixation effect and promoting bone growth and healing. In addition, the design of the guide hole 5 and the transverse groove 4 can reduce possible errors and instabilities during implantation, providing greater convenience and safety for surgical operations. The side wall of the screw post 1 has several tooth root holes 6 that communicate with the guide hole 5 and the transverse groove 4. The tooth root holes 6 are inclined from the tooth root to the screw tail 3. The tooth root holes 3 can promote the growth of internal bone tissue and increase the contact area between the bone and the screw post 1, thereby improving the fixation effect and reducing the risk of postoperative loosening.

[0027] Based on the above implementation method, see Figures 1-6 The screw post 1 is made of pure magnesium material with a purity of 99.9% to 99.999% after ultrasonic rolling treatment, which can significantly enhance its strength and toughness and has good corrosion resistance. In addition, this material can promote the growth of surrounding bone tissue, help enhance the stability of tendons and bones in patients, and thus improve the stability of surgery. Furthermore, high-purity pure magnesium can effectively control the absorption of unnecessary elements by the human body, and its gradual degradation characteristics can avoid the need for secondary surgery, while also being beneficial to the wound healing process.

[0028] Based on the above embodiments, the external thread on the outside of the screw post 1 includes a tooth crest of a protruding portion and a tooth root of a recessed portion. The tooth crest surface is the outermost tooth crest surface retained during the process of turning an interface screw after ultrasonically rolling a 99.9% to 99.999% pure magnesium rod. The recessed portion is obtained after the ultrasonically rolled surface is removed during the turning process. The tooth root hole 6 is provided at the tooth root.

[0029] The screw head 2 has a hexagonal bolt through-hole 21, which communicates with the guide hole 5 and the transverse through-slot 4. This design allows for the use of tools and the force provided by the doctor when inserting the screw post 1 into the patient's tibia. The hexagonal shape of the hexagonal bolt through-hole 21 enables efficient connection of tools. When the screw post 1 penetrates the cortical bone and embeds into the cancellous bone, the screw head 2 can better conform to the cortical bone, improving the efficiency and quality of the operation.

[0030] Although the embodiments of this utility model have been described in detail above, it will be apparent to those skilled in the art that various modifications and variations can be made to these embodiments. However, it should be understood that such modifications and variations fall within the scope and spirit of this utility model as described in the claims. Moreover, the utility model described herein may have other embodiments and can be implemented or realized in various ways.

Claims

1. A biodegradable interface screw with high-strength ultrasonically rolled external threads, characterized in that, It includes a screw post, with external threads on the outside of the screw post, a screw head fixedly connected to the end of the screw post, a screw tail fixedly connected to the end of the screw post away from the screw head, a transverse through groove in the center of the screw post, and guide holes communicating with the transverse through groove at both ends of the screw post. The diameter of the transverse through groove is larger than the diameter of the guide hole. Several root holes communicating with the guide holes and the transverse through groove are opened on the side wall of the screw post. The root holes are inclined.

2. The biodegradable interface screw with high-strength ultrasonically rolled external threads according to claim 1, characterized in that, The external thread on the outer side of the screw post includes a tooth crest on the raised portion and a tooth base on the recessed portion, with a tooth base hole located at the tooth base.

3. The biodegradable interface screw with high-strength ultrasonically rolled external threads according to claim 2, characterized in that, The tooth bottom hole is set at an angle from the tooth bottom towards the screw tail.

4. The biodegradable interface screw with high-strength ultrasonically rolled external threads according to claim 1, characterized in that, The screw head has a hexagonal bolt through hole that connects to the guide hole and the transverse through groove.

Images