Large-deflection-angle sacroiliac reduction nail

Abstract

The utility model relates to the technical field of medical instruments, in particular to a large-deflection-angle sacroiliac reduction nail. A ball head is arranged through the ball head nail; the screw seat is divided into an upper screw seat and a lower screw seat; an inner hole of the upper screw seat is provided with a screw seat boss for limiting the separation of the limiting mechanism; the lower screw seat is provided with a bottom spherical cavity; the ball head is of a hemispherical structure and is matched with a bottom spherical cavity of the lower screw base and a limiting mechanism spherical inner cavity of the limiting mechanism to conduct universal angle swing. The head of the limiting mechanism is of a limiting boss structure, the size of the limiting boss structure is slightly larger than that of a screw base boss, a limiting mechanism spherical inner cavity in the bottom of the limiting mechanism is matched with a ball head structure of the ball head screw, and the limiting mechanism slightly deforms to press the structure of the ball head screw after being pressed. Dangerous operation affecting product performance is not introduced in the assembling process, meanwhile, the structure is stable, the ball head nail does not fall off, the swing angle is larger, and the application clinical range is wider.

Description

Technical Field

[0001] This utility model relates to the technical field of medical devices, and in particular to a large-angle sacroiliac repositioning nail. Background Technology

[0002] Currently, most sacroiliac repositioning nail products are assembled from the bottom, which has poor structural stability and makes the ball-head nails easy to dislodge. At the same time, the assembly process of the bottom-mounted structure is complicated and can easily damage the various parts of the product, resulting in a reduced product lifespan and the risk of secondary injury. In addition, most sacroiliac repositioning nails in the current technology have limited swing angles, which cannot meet clinical needs in special circumstances. Utility Model Content

[0003] The purpose of this invention is to provide a large-angle sacroiliac repositioning nail to address the deficiencies in existing technologies. This achieves the following effects: the sacroiliac repositioning nail is easy to assemble, does not introduce dangerous operations that affect product performance during assembly, has a stable structure and no risk of the ball-head nail dislodging, and has a larger swing angle, making it applicable to a wider range of clinical settings.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a large-angle sacroiliac repositioning nail, comprising a ball-head nail, a limiting mechanism, and a screw seat; the ball-head nail is provided with a ball head; the screw seat is divided into an upper screw seat and a lower screw seat; the inner hole of the upper screw seat is provided with a screw seat boss to restrict the disengagement of the limiting mechanism, and the lower screw seat is provided with a bottom spherical cavity; the ball head is a hemispherical structure and cooperates with the bottom spherical cavity of the lower screw seat and the spherical inner cavity of the limiting mechanism to allow for omnidirectional oscillation; the head of the limiting mechanism is a limiting boss structure, the size of which is slightly larger than that of the screw seat boss; the spherical inner cavity of the limiting mechanism at the bottom of the limiting mechanism cooperates with the ball head structure of the ball-head nail; the limiting mechanism slightly deforms and presses the ball-head nail under pressure, preventing the ball-head nail from continuing to omnidirectionally oscillate.

[0005] Furthermore, a cylindrical oblique groove is provided on one side of the coronal plane at the bottom of the lower screw seat, and the angle of the cylindrical oblique groove is selected according to the needs of clinical application.

[0006] Furthermore, the ball-head screw is also provided with a neck, which is a near-cylindrical structure and mates with the cylindrical oblique groove at the bottom of the lower screw seat.

[0007] Furthermore, the upper half of the upper screw seat is milled with a U-shaped groove, and the outer wall of the upper screw seat, which is in the same direction as the U-shaped groove, is provided with four T-shaped groove features.

[0008] Furthermore, the ball-head screw is also provided with bone threads, which are cortical bone threads with a major diameter of 8-10 mm.

[0009] Furthermore, an internal thread structure adapted to the bone thread is added into the lower screw seat hole to facilitate the unscrewing of the ball head screw from the lower screw seat by the bone thread structure.

[0010] Furthermore, the ball head is provided with a self-tapping groove on its head surface to reduce the screwing torque during implantation.

[0011] Furthermore, the limiting mechanism is cylindrical in shape.

[0012] Furthermore, the limiting mechanism is made of TAG material.

[0013] Furthermore, the connection between the upper screw seat and the lower screw seat is fixed by laser welding.

[0014] The device comprises a ball-head screw, a limiting mechanism, and a screw seat. The ball-head screw has a ball head. The screw seat is divided into an upper screw seat and a lower screw seat. The upper screw seat has a screw seat boss in its inner hole to restrict the limiting mechanism from dislodging. The lower screw seat has a bottom spherical cavity. The ball head is a hemispherical structure that cooperates with the bottom spherical cavity of the lower screw seat and the spherical inner cavity of the limiting mechanism to allow for omnidirectional swinging. The head of the limiting mechanism is a limiting boss structure, the size of which is slightly larger than that of the screw seat boss. The spherical inner cavity of the limiting mechanism at the bottom of the limiting mechanism cooperates with the ball head structure of the ball-head screw. When subjected to pressure, the limiting mechanism slightly deforms and presses the ball-head screw, preventing it from continuing to swing omnidirectionally. This structure achieves the advantages of easy assembly of the sacroiliac reduction screw, avoiding dangerous operations that could affect product performance during assembly, structural stability, no risk of the ball head screw dislodging, and a wider swing angle, thus broadening its clinical applicability. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a front sectional view of a large-angle sacroiliac repositioning nail according to this utility model;

[0017] Figure 2 This is an exploded view of a large-angle sacroiliac repositioning nail according to this utility model;

[0018] Figure 3 This is a schematic diagram of a large-angle sacroiliac reduction screw ball-head screw according to the present invention;

[0019] Figure 4 This is a schematic diagram of a large-angle sacroiliac repositioning nail limiting mechanism according to the present invention;

[0020] Figure 5 This is a schematic diagram of a large-angle sacroiliac repositioning screw seat according to the present invention;

[0021] Figure label:

[0022] Ball head 1, ball head 1-1, nail neck 1-2, bone thread 1-3, self-tapping groove 1-4, limiting mechanism 2, limiting mechanism spherical inner cavity 2-1, limiting boss structure 2-2, screw seat 3, upper screw seat 3-1, U-shaped groove 3-1-1, T-shaped groove feature 3-1-2, screw seat boss 3-1-3, lower screw seat 3-2, bottom spherical cavity 3-2-1, cylindrical oblique hole groove 3-2-2. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0024] In the description of this utility model, it should be noted that the orientation or positional relationship indicated by terms such as "center", "up", "down", "left", "right", "vertical", "horizontal", "inner", and "outer" are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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 limitations on this utility model.

[0025] A type of large-angle sacroiliac reduction nail, such as Figure 1 , 2As shown, it includes a ball-head screw 1, a limiting mechanism 2, and a screw seat 3; the ball-head screw 1 is provided with a ball head 1-1; the screw seat 3 is divided into an upper screw seat 3-1 and a lower screw seat 3-2; the upper screw seat 3-1 has a screw seat boss 3-1-3 in its inner hole to restrict the limiting mechanism 2 from disengaging; the lower screw seat 3-2 is provided with a bottom spherical cavity 3-2-1; the ball head 1-1 is a hemispherical structure and is connected to the bottom spherical cavity 3-2-1 of the lower screw seat 3-2 and the limiting mechanism 2. The limiting mechanism 2 has a spherical inner cavity 2-1 that engages with the limiting mechanism to allow for omnidirectional oscillation. The head of the limiting mechanism 2 is a limiting boss structure 2-2, which is slightly larger than the screw seat boss 3-1-3. The spherical inner cavity 2-1 at the bottom of the limiting mechanism 2 engages with the ball head 1-1 of the ball head nail 1. When subjected to pressure, the limiting mechanism 2 slightly deforms and presses the ball head nail 1, preventing the ball head nail 1 from continuing to omnidirectionally oscillate.

[0026] Specifically, the screw seat 3 is divided into an upper screw seat 3-1 and a lower screw seat 3-2. The ball head screw 1 is assembled above the lower screw seat 3-2, and then the upper screw seat 3-1 and the lower screw seat 3-2 are connected and fixed. This not only simplifies the assembly process but also avoids the component damage and reduced product lifespan that may be caused by the traditional bottom-mounted structure. At the same time, the spherical cavity at the bottom of the lower screw seat 3-2 allows the ball head screw 1 to have a larger swing range, meeting a wider range of clinical needs. The hemispherical structure of the ball head screw 1 can interact with the lower screw seat 3-2. The bottom spherical cavity 3-2-1 and the limiting mechanism 2's limiting mechanism spherical inner cavity 2-1 work together perfectly to achieve omnidirectional swing, breaking through the limitation of the traditional sacroiliac repositioning nail's limited swing angle, enhancing the product's flexibility and applicability. The limiting mechanism 2 ensures that it will not come out after assembly. At the same time, the bottom spherical inner cavity of the limiting mechanism 2 can fit tightly with the ball head nail 1 and slightly deform to press the ball head nail 1 under pressure, thereby effectively preventing further swing of the ball head nail 1 and improving the product's structural stability. Therefore, by adopting a split structure of upper screw seat 3-1 and lower screw seat 3-2, and the close cooperation between the limiting mechanism 2 and the ball head screw 1, the assembly process is greatly simplified, avoiding the cumbersome assembly process and easy damage to parts in the traditional bottom-mounted structure assembly process. Through the limiting mechanism 2 and its close cooperation with the ball head screw 1 and screw seat 3, the ball head screw is effectively prevented from coming out and swinging excessively, which greatly improves the structural stability of the product. The spherical cavity at the bottom of the screw seat 3 allows the ball head screw 1 to have a larger swing range, thereby meeting a wider range of clinical needs and providing better treatment results.

[0027] As a preferred embodiment of the above, such as Figure 3As shown, a cylindrical oblique groove 3-2-2 is provided on one side of the coronal plane at the bottom of the lower screw seat 3-2. The angle of the cylindrical oblique groove 3-2-2 is selected according to the needs of clinical application to increase the swing angle of the ball head screw on one side. The cylindrical oblique groove is designed only on one side, which is mainly due to the universal structure of the present invention.

[0028] Specifically, by setting a cylindrical oblique groove 3-2-2 on one side of the coronal plane at the bottom of the lower screw seat 3-2, and allowing its angle to be selected according to the specific needs of clinical application, the product's swing angle can be customized. This not only improves the product's flexibility and applicability, but also better meets the operational needs of clinicians and improves surgical outcomes. Through the close cooperation between the limiting mechanism 2, the ball head screw 1, and the screw seat 3, as well as the special structure of the lower screw seat 3-2, it is ensured that the ball head screw will not come out or swing excessively during the swing process, thereby ensuring the safety and reliability of the surgery. The cylindrical oblique groove 3-2-2 allows clinicians to make quick and accurate adjustments as needed during the operation, thereby simplifying the surgical steps and improving surgical efficiency. Through the customized swing angle, it can better adapt to the anatomical structure and surgical needs of different patients, thereby improving the accuracy and success rate of the surgery.

[0029] As a preferred embodiment of the above, such as Figure 3 As shown, the ball head nail 1 is also provided with a nail neck 1-2, which is a cylindrical structure and cooperates with the cylindrical oblique hole groove 3-2-2 at the bottom of the lower screw seat 3-2 to obtain a larger swing angle.

[0030] Specifically, the neck 1-2 allows the ball-head screw 1 to swing within a wider range, especially when it engages with the cylindrical oblique groove 3-2-2 at the bottom of the lower screw seat 3-2. This not only improves the product's flexibility but also allows the ball-head screw 1 to better adapt to surgical needs at different angles, thereby improving surgical accuracy and success rate. The engagement between the neck 1-2 and the cylindrical oblique groove 3-2-2 maintains the overall structural stability of the product. The tight engagement of the limiting mechanism 2 ensures that the ball-head screw 1 will not dislodge or swing excessively during the swinging process, thus guaranteeing the safety and reliability of the surgery. The neck 1-2 makes the ball head screw 1 easier to control and manipulate during surgery. Clinicians can change the swing angle of the ball head screw 1 by adjusting the position of the neck 1-2 in the cylindrical oblique groove 3-2-2, thereby simplifying the surgical steps and improving surgical efficiency. The larger swing angle and greater flexibility allow the ball head screw 1 to better adapt to the anatomical structure and surgical needs of different patients, thereby improving the accuracy and success rate of the surgery. The design of the neck 1-2 makes it easier for clinicians to control and manipulate the ball head screw 1 during surgery, thereby improving the convenience and comfort of the surgery.

[0031] As a preferred embodiment of the above, such as Figure 5 As shown, the upper part of the upper screw seat 3-1 is milled with a U-shaped groove 3-1-1 to accommodate orthopedic implants such as orthopedic rods. The outer wall of the upper screw seat 3-1, which is in the same direction as the U-shaped groove 3-1-1, is provided with four T-shaped groove features 3-1-2, which are structures for cooperating with implanted devices.

[0032] Specifically, the U-shaped groove 3-1-1 allows the upper screw seat 3-1 to accommodate orthopedic implants such as orthopedic rods, which not only broadens the product's application range but also enables it to be used in combination with other orthopedic implants, thereby improving the flexibility and effectiveness of surgery. The four T-shaped groove features 3-1-2 allow the upper screw seat 3-1 to be used with various implant instruments, improving the product's versatility and enabling clinicians to select appropriate implant instruments as needed during surgery, thus improving the convenience and efficiency of the operation. Clinicians can select appropriate implant instruments as needed during surgery and use the T-shaped groove features 3-1-2 to cooperate with the upper screw seat 3-1, thereby improving the convenience and efficiency of the operation.

[0033] As a preferred embodiment of the above, such as Figure 1 As shown, the ball-head screw 1 is also provided with bone threads 1-3, which are cortical bone threads with a major diameter of 8-10 mm, and have high pull-out resistance, which is beneficial to improving the implantation stability of the product.

[0034] Specifically, the cortical bone threads allow the ball-head screw 1 to better integrate with bone tissue, especially in the cortical bone region. This not only increases the friction between the ball-head screw 1 and the bone tissue but also improves its pull-out resistance within the bone tissue, thus ensuring the stability of the product after implantation. The major diameter of the bone threads 1-3 is designed to be 8-10mm. This size range ensures sufficient thread depth while avoiding unnecessary damage to the bone tissue caused by excessive size. This improves both the implantation stability of the product and the safety of the surgery. The cortical bone threads make the ball-head screw 1 suitable for more types of bone tissue and surgical needs, which not only improves the versatility of the product but also allows clinicians to select the appropriate ball-head screw 1 according to their needs during surgery, thereby improving the accuracy and success rate of the surgery. The higher implantation stability and pull-out resistance allow the ball-head screw 1 to remain better in the bone tissue after surgery, thus improving the long-term effect of the surgery.

[0035] As a preferred embodiment of the above, such as Figure 5 As shown, an internal thread structure adapted to the bone thread 1-3 is added into the hole of the lower screw seat 3-2, so that the bone thread 1-3 structure of the ball head screw 1 can be screwed out of the lower screw seat 3-2.

[0036] Specifically, by adding an internal thread structure that matches the bone thread 1-3 inside the hole of the lower screw seat 3-2, the connection between the ball head screw 1 and the lower screw seat 3-2 can be made tighter and more stable. This not only improves the reliability of the product during surgery but also reduces the risk of complications caused by loosening of the connection. The matching design of the internal thread structure with the bone thread 1-3 allows the ball head screw 1 to be easily screwed into and out of the lower screw seat 3-2, which not only simplifies the surgical procedure and improves surgical efficiency but also allows clinicians to quickly and accurately install and remove the ball head screw 1 as needed during surgery. Adding an internal thread structure inside the hole of the lower screw seat 3-2 does not increase the complexity or size of the product, making the product structure more compact and reasonable, which is beneficial to the manufacturing and quality control of the product. The matching of the internal thread structure with the bone thread 1-3 makes the installation and removal steps during surgery simpler, thereby improving the convenience and efficiency of the surgery.

[0037] As a preferred embodiment of the above, such as Figure 3 As shown, the ball head nail 1 is also provided with self-tapping grooves 1-4 on its head surface to reduce the screwing torque during implantation.

[0038] Specifically, the self-tapping grooves 1-4 make it easier for the ball head screw 1 to be screwed into the bone tissue during implantation, thereby reducing the screwing torque. This not only reduces resistance during the operation but also allows clinicians to complete the implantation operation with less force, reducing the difficulty and fatigue of the operation. The reduced screwing torque means that the implantation process is smoother and faster, thereby improving implantation efficiency, shortening the operation time, and reducing patient pain and the risk of complications. The self-tapping grooves 1-4 do not increase the complexity or size of the product but cleverly utilize the surface space of the ball head screw 1, making the product structure more compact and reasonable, which is beneficial to the manufacturing, quality control and cost control of the product.

[0039] As a preferred embodiment of the above, such as Figure 4 As shown, the limiting mechanism 2 is cylindrical in shape.

[0040] As a preferred embodiment of the above, such as Figure 4 As shown, the limiting mechanism 2 is made of TA3G material.

[0041] Specifically, the cylindrical design allows the limiting mechanism 2 to maintain sufficient strength while having a more compact shape, which helps to reduce the overall size and weight of the product, making it easier to carry and store. The TA3G material has high strength and toughness, which can meet the mechanical performance requirements of the limiting mechanism 2 during the operation. As a titanium alloy material, TA3G material has good biocompatibility, which can reduce the rejection reaction of the human body after implantation, improve the success rate of the operation and the speed of patient recovery.

[0042] As a preferred embodiment of the above, such as Figure 1 As shown, the connection between the upper screw seat 3-1 and the lower screw seat 3-2 is fixed by laser welding.

[0043] Specifically, laser welding technology can provide a precise and high-strength connection, ensuring that the upper screw seat 3-1 and the lower screw seat 3-2 form a strong whole at the joint. This connection method is more reliable than traditional mechanical or adhesive connections, and can withstand greater external forces and torques, ensuring the stability and safety of the product during surgery. Laser welding technology is characterized by high precision and a low heat-affected zone, enabling precise welding without damaging surrounding materials. This helps maintain the precise alignment between the upper screw seat 3-1 and the lower screw seat 3-2, ensuring the overall performance and function of the product.

[0044] The ball head nail 1 and screw seat 3 in this invention are made of titanium alloy TC4 material, and the limiting mechanism 2 is made of pure titanium TA3G material. All components are machined.

[0045] Specifically, titanium alloy TC4 possesses excellent mechanical properties, including high strength and toughness, meeting the mechanical performance requirements of medical implants during surgery and use. TC4 also exhibits superior corrosion resistance, maintaining stable performance within the human body environment and reducing the risk of implant failure due to corrosion. Pure titanium TA3G, compared to titanium alloys, has higher purity, further reducing impurities and helping to minimize inflammatory reactions caused by implants within the body. Pure titanium TA3G also boasts excellent machinability, facilitating the fabrication of components into desired shapes through machining while maintaining mechanical properties and biocompatibility. The choice between titanium alloy TC4 and pure titanium TA3G, along with the application of machining processes, collectively enhances the product's mechanical properties, corrosion resistance, and biocompatibility, providing clinicians and patients with more reliable and safer implant solutions.

[0046] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A large-angle sacroiliac reduction nail, characterized in that: Includes ball head nail (1), limiting mechanism (2), and screw seat (3); The ball head nail (1) is provided with a ball head (1-1); The screw seat (3) is divided into an upper screw seat (3-1) and a lower screw seat (3-2); the upper screw seat (3-1) has a screw seat boss (3-1-3) in its inner hole to restrict the release of the limiting mechanism (2); the lower screw seat (3-2) is provided with a bottom spherical cavity (3-2-1); The ball head (1-1) has a hemispherical structure and cooperates with the bottom spherical cavity (3-2-1) of the lower screw seat (3-2) and the spherical inner cavity (2-1) of the limiting mechanism (2) to swing in all directions. The head of the limiting mechanism (2) is a limiting boss structure (2-2), the size of which is slightly larger than that of the screw seat boss (3-1-3). The spherical inner cavity (2-1) of the limiting mechanism at the bottom of the limiting mechanism (2) cooperates with the ball head (1-1) structure of the ball head nail (1). When the limiting mechanism (2) is subjected to pressure, it slightly deforms and presses the ball head nail (1) so that the ball head nail (1) cannot continue to swing in all directions.

2. The large-angle sacroiliac reset peg according to claim 1, characterized in that, The bottom of the lower screw seat (3-2) is provided with a cylindrical oblique groove (3-2-2) on one side of the coronal plane. The angle of the cylindrical oblique groove (3-2-2) is selected according to the needs of clinical application.

3. The large-angle sacroiliac reset peg according to claim 2, characterized in that, The ball head nail (1) is also provided with a nail neck (1-2), which is a cylindrical structure and cooperates with the cylindrical oblique hole groove (3-2-2) at the bottom of the lower screw seat (3-2).

4. The large-angle sacroiliac reset peg according to claim 1, characterized in that, The upper half of the upper screw seat (3-1) is milled with a U-shaped groove (3-1-1), and the outer wall of the upper screw seat (3-1) in the same direction as the U-shaped groove (3-1-1) is provided with four T-shaped groove features (3-1-2).

5. The large-angle sacroiliac reset peg according to claim 1, wherein, The ball-head screw (1) is also provided with bone threads (1-3), which are cortical bone threads with a major diameter of 8-10 mm.

6. The large-angle sacroiliac reset peg according to claim 5, characterized in that An internal thread structure adapted to the bone thread (1-3) is added into the hole of the lower screw seat (3-2) to facilitate the unscrewing of the bone thread (1-3) structure of the ball head screw (1) from the lower screw seat (3-2).

7. The large-angle sacroiliac reset peg according to claim 1, wherein, The ball head nail (1) is also provided with a self-tapping groove (1-4) on its head surface to reduce the screwing torque during implantation.

8. The large-angle sacroiliac reset peg according to claim 1, wherein, The limiting mechanism (2) is cylindrical in shape.

9. The large-angle sacroiliac reset peg according to claim 1, wherein, The limiting mechanism (2) is made of TA3G material.

10. The large-angle sacroiliac reset peg according to claim 1, wherein, The upper screw seat (3-1) and the lower screw seat (3-2) are fixed by laser welding.

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