Fixing rivet for avulsion fracture

Abstract

The invention discloses a fixing rivet for avulsion fracture and relates to the technical field of medical instruments, the fixing rivet comprises a rivet body, a rivet end cover is arranged at the upper end of the rivet body, a hexagonal groove facilitating auxiliary drilling of the rivet body is formed in the center of the upper surface of the rivet end cover, and a threading hole is formed in the side of the rivet end cover. And a threading hole is formed in the rivet end cover in a penetrating mode, a pressing piece is arranged on the upper surface of the rivet end cover, and the fixing rivet for avulsion fracture is provided with the fixing rivet. The two sets of medical sutures penetrate through the threading holes in a staggered mode, based on the medical principle of stable suturing and accurate positioning, reliable and accurate suturing and positioning can be conducted on the pressing piece, the situation that the pressing piece deviates due to the factors such as external force and tissue peristalsis in the surgical operation or postoperative recovery process is effectively avoided, and the working efficiency is improved. It is ensured that the pressing piece is located at the ideal fixing position all the time, then a solid guarantee is provided for stable fixing of avulsion bone blocks or ligaments, and the accuracy and reliability of surgical treatment are remarkably improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to a fixing rivet for avulsion fracture. BACKGROUND

[0002] Avulsion fracture is caused by the violent traction of ligament or tendon, which leads to the detachment of bone block from the main bone. It is often found in ankle joint (such as the insertion of anterior tibiofibular ligament), knee joint (such as the tibial insertion of posterior cruciate ligament) and other parts. This kind of injury is often accompanied by ligament rupture, and the connection between bone and soft tissue needs to be repaired at the same time. When avulsion fracture is accompanied by ligament injury, rivet is a commonly used fixing device, which can achieve stable fixation by anchoring ligament insertion and dispersing stress, and is especially suitable for complex injuries around joints.

[0003] Prior art one (Chinese patent with publication number CN208176571U and publication date of 2018-12-04) discloses a kind of with line rivet capable of stably connecting tendon-bone, including nail body, clamping groove and suture, the nail body axial direction is provided with one end through clamping groove, the outer surface of the nail body is provided with screw thread, one end of the suture is connected in the clamping groove, one end of the suture is connected in the clamping groove of the nail body, to ensure that one end is fixed during use, the other end can be conveniently knotted with the suture on other nail body, the knot is small, the contact area of tendon and bone can also be guaranteed, which is beneficial to postoperative healing, the connection of muscle tendon or bone block is firm, the tendon-bone healing ability is enhanced, especially for the treatment of some ligament insertion avulsion fracture, it has more advantages, only need to screw into anchor between bone bed or through bone block, the line between different anchors is crossed and knotted, reliable fixation can be realized, and when operating under arthroscope, the situation that the line is pulled out due to improper operation can also be avoided, which has great popularization value in tendon-bone suture surgery.

[0004] Prior art two (Chinese patent with publication number CN206534671U and publication date of 2017-10-03) discloses a new medical rivet, which comprises a rivet, a pressing sheet, a locking screw and a suture with a needle. The proximal end of the pressing sheet is arranged at the tail of the rivet, and the distal end of the pressing sheet has a first screw hole. The rivet has a second screw hole. The locking screw is arranged in the first screw hole and the second screw hole, and forms a stable "tripod" structure with the rivet and the pressing sheet. The suture is connected to the pressing sheet and is used for suturing and reinforcing the ligament attached to the avulsion bone block. The suture can press and fix the avulsion bone block around the joint or the tendon, promote bone fracture healing, repair and reinforce the ligament or tendon, and thus facilitate early functional exercise of the affected limb after operation and improve the function of the injured limb.

[0005] Although the prior art still needs to use the sewing method to position the compression plate when fixing the compression plate, the operation is relatively complicated, and the use of single material rivets has slow bone growth healing, and the use of rivets has certain limitations.

[0006] Therefore, we propose a fixed rivet for avulsion fracture to solve the above problems. SUMMARY

[0007] The purpose of the present application is to provide a fixed rivet for avulsion fracture to solve the above problems in the background art that the current market needs to use the sewing method to position the compression plate, the operation is relatively complicated, and the use of single material rivets has slow bone growth healing, and the use of rivets has certain limitations.

[0008] To achieve the above purpose, the present application provides the following technical scheme: a fixed rivet for avulsion fracture, comprising a rivet body, the upper end of the rivet body is provided with a rivet end cover, and the upper surface center position of the rivet end cover is provided with a hexagonal groove for facilitating the auxiliary drilling of the rivet body, the side of the rivet end cover is provided with a threading hole, and the inside of the threading hole is provided with a threading hole, the upper surface of the rivet end cover is provided with a compression plate, the inside of the rivet end cover and the rivet body is provided with a resisting mechanism, the resisting mechanism realizes the auxiliary limiting of the compression plate through the movement of the fixing nail contained therein, and the inside of the rivet body is also provided with a limiting mechanism, the limiting mechanism improves the stability of the rivet body through the movement of the auxiliary nail contained therein.

[0009] Preferably, the threading holes are arranged in four groups about the center point of the rivet end cover in a ring shape, and the same suture is provided inside the threading holes at the corresponding position of the oblique angle, and the suture is provided in two groups, and the two groups of sutures are arranged alternately.

[0010] Preferably, the suture is provided through the compression plate and knotted and tightened, and the compression plate is located between the suture and the upper surface of the rivet end cover, and the avulsion bone block and the ligament can be fixed by the compression plate.

[0011] Preferably, the rivet body is made of metal material, and the outside of the rivet body is coated with a coating, and the coating is a HA coating which is beneficial to bone growth healing.

[0012] Preferably, the resisting mechanism comprises a resisting through hole, the resisting through hole is provided at the center position of the rivet end cover, the inside of the rivet body is provided with an auxiliary cavity and a sliding groove, the diameter of the auxiliary cavity is greater than the maximum value of the diameters of the resisting through hole and the sliding groove, and the resisting through hole is connected with the auxiliary cavity through the sliding groove.

[0013] Preferably, the rivet end cover is slidably connected with a fixing nail, the upper end of the fixing nail is provided in a conical structure, the inner side of the lower end of the fixing nail is provided in an inclined structure, and the lower end of the fixing nail is located at the auxiliary cavity position, and the fixing nail is arranged in an annular array about the center point of the rivet end cover.

[0014] Preferably, the inner side of the lower end of the fixing nail is provided in an inclined structure, and the lower end of the fixing nail is located at the auxiliary cavity position, and the fixing nail is arranged in an annular array about the center point of the rivet end cover.

[0015] Preferably, the limiting mechanism comprises a receiving groove, the receiving groove is opened in the side of the rivet body, the receiving groove is opened in an annular array about the center point of the rivet body, the inner side of the receiving groove is slidably connected with an auxiliary nail, the outer end of the auxiliary nail is provided in a conical structure, and the inner end of the auxiliary nail is provided in an inclined structure.

[0016] Preferably, the conical structure end of the auxiliary nail in the unused state is located in the inner side of the receiving groove, the inner end of the auxiliary nail is located in the inner side of the sliding groove, the lower end of the inner rod is provided in an arc structure, the lower end of the inner rod in the unused state is located above the auxiliary nail, and the auxiliary nail forms a sliding structure with the receiving groove through the inner rod.

[0017] Compared with the prior art, the present application has the following advantages: (1) Four groups of threading holes are arranged, two groups of medical sutures are staggered and threaded through the threading holes, based on the medical principles of stable suturing and accurate positioning, reliable and accurate suturing and positioning of the compression plate can be achieved, position deviation of the compression plate caused by external force, tissue peristalsis and other factors during operation or postoperative recovery process can be effectively avoided, the compression plate can be ensured to be always in an ideal fixed position, thereby providing a solid guarantee for stable fixation of the avulsed bone block or ligament, and the accuracy and reliability of surgical treatment are significantly improved.

[0018] (2) The rivet body is made of metal material, the metal material has good biocompatibility and mechanical properties, can provide suitable microenvironment support for bone growth, and in addition, a layer of HA coating is coated on the outer side of the rivet body, hydroxyapatite as an inorganic component of human bone has excellent bone conduction and bone induction, through the synergistic effect of the HA coating and the metal rivet body, the local conditions for bone growth can be further optimized, the bonding strength between the rivet body and the surrounding bone tissue is significantly enhanced, the fixation is more reliable, and the healing process of the fractured part is effectively promoted.

[0019] (3) When the rivet body is completed, the flexible gasket is subjected to downward pressure, and the flexible gasket moves downward under the action of the pressure. Since the lower surface of the flexible gasket is provided with an inner rod, the inner rod will move downward along the pre-set sliding groove synchronously with the movement of the flexible gasket. In the process of the downward movement of the inner rod along the sliding groove, the auxiliary nail will move outward along the receiving groove according to the mechanical principle, and the tapered portion provided at the outer end of the auxiliary nail will protrude outside the rivet body, so that the tapered portion can interact with the surrounding tissue or structure in the transverse direction, thereby forming an effective limiting action on the rivet body, significantly enhancing the stability of the rivet body at the implantation site and ensuring that it can reliably play a fixing function for a long time.

[0020] (4) When the flexible gasket is displaced to a specific position of the auxiliary cavity, the edge or contact surface of the flexible gasket will physically contact the inclined portion of the fixed nail, driving the fixed nail to move upward. After the flexible gasket completes the contact and driving of the fixed nail, its own position is at the lower side area of the fixed nail, effectively preventing the fixed nail from being affected by other external forces or its own gravity and other factors to move downward, thereby ensuring the relative position stability of the fixed nail at the implantation site. At this time, the pressure sheet is placed at the predetermined position, and the pressure sheet is fixed by using a suture. The lower surface of the pressure sheet is subjected to the upward supporting force of the fixed nail, and the upper surface of the pressure sheet is subjected to the downward pulling force of the suture, forming a downward limiting mechanism. The double limiting mechanism of the upper and lower surfaces significantly enhances the setting stability of the pressure sheet at the implantation site, so that it can reliably play its predetermined function for a long time in the complex and variable human physiological environment, meeting the needs of medical applications. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a schematic diagram of the three-dimensional structure of the present application; Figure 2 is a schematic diagram of the three-dimensional structure of the present application in an assembled state; Figure 3 is a schematic diagram of the three-dimensional structure of the rivet end cap of the present application; Figure 4 is a schematic diagram of the three-dimensional structure of the present application in an assembled state; Figure 5 is a schematic diagram of the three-dimensional structure of the present application in an un-assembled state; Figure 6 is a schematic diagram of the three-dimensional structure of the fixed nail of the present application; Figure 7 is a schematic diagram of the three-dimensional structure of the flexible gasket of the present application; Figure 8 is a schematic diagram of the three-dimensional structure of the present application Figure 5 is an enlarged structure schematic diagram of position A in the present application; Figure 9 is an enlarged structure schematic diagram of position B in the present application. Figure 5 is an enlarged structure schematic diagram of position B in the present application.

[0022] Fig. 1, rivet body; 2, rivet end cap; 3, hexagonal groove; 4, threading hole; 5, pressing piece; 6, coating layer; 7, inner rod; 8, flexible gasket; 9, storage groove; 10, suture; 11, auxiliary nail; 12, fixed nail; 13, sliding groove; 14, abutting through hole; 15, auxiliary cavity. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0024] Embodiment one: In order to effectively promote the healing process of the fracture site, a HA hydroxyapatite coating layer 6 is arranged on the outer side of the metal rivet body 1, so as to further promote bone growth, and the suture 10 is arranged in a staggered manner, so as to further improve the stability of the pressing piece 5, as shown in the technical solution. Figure 1 Figure 5 The present application provides the following technical solution: a fixed rivet for avulsion fracture, which discloses that the upper end of the rivet body 1 is provided with a rivet end cap 2, a hexagonal groove 3 is arranged at the center position of the upper surface of the rivet end cap 2, which facilitates the auxiliary drilling of the rivet body 1, a threading hole 4 is arranged at the side of the rivet end cap 2, and a suture 10 is arranged in the threading hole 4, the upper surface of the rivet end cap 2 is provided with a pressing piece 5, four groups of threading holes 4 are arranged in an annular array about the center point of the rivet end cap 2, a same suture 10 is arranged in the threading holes 4 at the corresponding oblique angle positions, the suture 10 is arranged in two groups, the two groups of sutures 10 are arranged in a staggered manner, the suture 10 is arranged on the pressing piece 5 and is knotted and tightened, the pressing piece 5 is located between the suture 10 and the upper surface of the rivet end cap 2, the avulsion bone block and the ligament can be fixed by the pressing piece 5, the rivet body 1 is made of metal, and a coating layer 6 is arranged on the outer side of the rivet body 1, and the coating layer 6 is a HA coating layer 6 which is beneficial to bone growth and healing.

[0025] ​The device is provided with four groups of threading holes 4, and two groups of sutures 10 are staggered and arranged through the threading holes 4, which can accurately and reliably stitch and position the tablet 5, effectively prevent the position deviation of the tablet 5 during the operation, and further optimize the positioning process of the tablet 5, significantly improve the operation efficiency, and ensure that the tablet 5 can more stably and accurately fix the torn bone fragments or ligaments. The rivet body 1 is made of metal material, which has excellent biocompatibility and excellent mechanical properties. The biocompatibility ensures that there is no obvious immune rejection reaction after being implanted into the human body, providing a safe physiological environment for the adhesion, proliferation and differentiation of bone cells on the surface of the rivet. Good mechanical properties can withstand various stresses on the fracture site, maintain the stability of the fracture end, and further build a suitable micro-mechanical environment support for bone growth. On the outside of the rivet body 1, there is a layer of HA coating 6. Hydroxyapatite, as an inorganic component of human bone, has unique bone conduction and bone induction. Bone conduction allows bone cells to grow and extend along the surface of the HA coating 6, while bone induction stimulates the differentiation of surrounding mesenchymal cells into osteoblasts, promoting the formation of new bone. Through the synergistic effect of the HA coating 6 and the metal rivet body 1, the two complementary advantages can further optimize the local conditions for bone growth. On the one hand, the HA coating 6 enhances the interaction between bone cells and the rivet, and on the other hand, the metal rivet provides stable mechanical support. The combination of the two significantly enhances the bonding strength between the rivet body 1 and the surrounding bone tissue, making the fixation more reliable, thereby effectively promoting the healing process of the fracture site, shortening the recovery time, and improving the treatment effect.

[0026] Example two: In order to further improve the stability of the tablet 5 and avoid the position deviation of the tablet 5, a resisting mechanism is provided, which can double limit the upper and lower surfaces of the tablet 5, further ensuring the stability of the tablet 5, such as Figure 4 Figure 7 and Figure 9 ​The technical scheme is shown, and the application provides the following technical scheme: a fixed rivet for avulsion fracture, which discloses that a rivet end cover 2 and a rivet body 1 are internally provided with a resisting mechanism, the movement of the fixed nail 12 contained in the resisting mechanism realizes auxiliary limiting of the pressing piece 5, the resisting mechanism comprises a resisting through hole 14, the resisting through hole 14 is arranged at the center position of the rivet end cover 2, the interior of the rivet body 1 is provided with an auxiliary cavity 15 and a sliding groove 13, the diameter of the auxiliary cavity 15 is greater than the maximum value of the diameters of the resisting through hole 14 and the sliding groove 13, the resisting through hole 14 is in communication with the auxiliary cavity 15 through the sliding groove 13, the fixed nail 12 is slidingly connected to the rivet end cover 2, the upper end of the fixed nail 12 is arranged in a conical structure, the inner side of the lower end of the fixed nail 12 is arranged in an inclined structure, and the lower end of the fixed nail 12 is located at the position of the auxiliary cavity 15, the fixed nail 12 is arranged in an annular array about the center point of the rivet end cover 2, the interior of the sliding groove 13 is slidingly connected with an inner rod 7, the upper end of the inner rod 7 is fixedly connected with a flexible gasket 8, the flexible gasket 8 is located at the position of the hexagonal groove 3 in the initial state, and the flexible gasket 8 is located at the position of the auxiliary cavity 15 in the adjusted state, the fixed nail 12 and the rivet end cover 2 form a sliding structure through the resisting action of the flexible gasket 8, and when the flexible gasket 8 is located below the fixed nail 12, the conical part of the fixed nail 12 is in contact with the lower surface of the pressing piece 5.

[0027] In the process of the flexible gasket 8 being extruded downward by external force, the flexible gasket 8 first contacts and resists the resisting through hole 14, the diameter of the resisting through hole 14 is smaller than the initial size of the flexible gasket 8, in the process of continuous downward movement, the flexible gasket 8 elastically deforms based on the flexibility and deformation characteristics of the material, so as to overcome the space limitation and continue to move downward, when the flexible gasket 8 moves to the position of the auxiliary cavity 15, the flexible gasket 8 gradually expands and restores to the original state due to the space of the auxiliary cavity 15 being greater than the volume of the flexible gasket 8, the flexible gasket 8 after expansion contacts the inclined part of the fixed nail 12 and generates a resisting force, according to the mechanical principle, the resisting force drives the fixed nail 12 to gradually move upward along the axial direction, after the flexible gasket 8 is completely expanded, the position of the flexible gasket 8 is located below the fixed nail 12, forming mechanical limiting of the fixed nail 12 downward, preventing the fixed nail 12 from returning downward, at this time, the pressing piece 5 is placed, and the suture 10 is used to accurately limit the pressing piece 5 through suturing operation, under this structure, the pressing piece 5 is upwardly supported and limited by the lower surface fixed nail 12 and is downwardly pulled and limited by the upper surface suture 10, forming a double limiting mechanism, which significantly improves the setting stability of the pressing piece 5 at the implantation site, and ensures that the pressing piece 5 can reliably function in the human physiological environment for a long time.

[0028] In order to improve the stability of the rivet body 1, a limiting mechanism is arranged, which forms a transverse direction force on the side of the rivet body 1, enhances the stability of the rivet body 1 in the implant site, and the technical scheme is shown in the drawings Figure 4 、 Figure 5 and Figure 8 The present application provides the following technical scheme: a fixed rivet for avulsion fracture, which discloses that the inside of the rivet body 1 is also provided with a limiting mechanism, the limiting mechanism improves the stability of the rivet body 1 by the movement of the auxiliary nail 11 contained therein, the limiting mechanism comprises a receiving groove 9, the receiving groove 9 is arranged on the side of the rivet body 1, and the receiving groove 9 is arranged in an annular array about the center point of the rivet body 1, and the inside of the receiving groove 9 is slidably connected with the auxiliary nail 11, and the outer end of the auxiliary nail 11 is arranged in a conical structure, and the inner end of the auxiliary nail 11 is arranged in an inclined structure on the upper surface, the conical structure end of the auxiliary nail 11 is located inside the receiving groove 9 in the unused state, and the inner end inclined part of the auxiliary nail 11 is located inside the sliding groove 13, the lower end of the inner rod 7 is arranged in an arc structure on the side, and the lower end of the inner rod 7 is located above the auxiliary nail 11 in the unused state, and the auxiliary nail 11 forms a sliding structure with the receiving groove 9 through the inner rod 7.

[0029] In the implanting operation link of the rivet body 1, the auxiliary nail 11 is arranged in the internal space of the receiving groove 9, which can ensure that the auxiliary nail 11 does not hinder the smooth implantation of the rivet body 1 during the implantation process, and guarantees the fluency and accuracy of the implantation operation, when the rivet body 1 is implanted, a vertical downward pressure is applied to the flexible gasket 8, the flexible gasket 8 will move downward along the vertical direction under the action of the pressure, since the lower surface of the flexible gasket 8 is fixedly provided with the inner rod 7, the inner rod 7 will slide downward along the pre-designed sliding groove 13 synchronously with the movement of the flexible gasket 8, in the process of the inner rod 7 sliding downward along the sliding groove 13, the inner rod 7 will be in contact with the auxiliary nail 11, the upper surface of the auxiliary nail 11 is designed in an inclined manner, when it is resisted by the inner rod 7, it will generate a component force outward along the receiving groove 9 according to the inclined surface force principle in mechanics, thereby driving the auxiliary nail 11 to move outward along the receiving groove 9, with the continuous movement of the auxiliary nail 11, the conical part of the auxiliary nail 11 will gradually extend to the external tissue environment of the rivet body 1, the auxiliary nail 11 interacts with the surrounding tissue, constructs a mechanical restriction mechanism on the rivet body 1 in the transverse dimension, and further significantly improves the biomechanical stability of the rivet body 1 in the implant site, ensuring its long-term reliable fixation in the human physiological environment.

[0030] Although the present application has been described in detail with reference to the foregoing embodiments, the technical solutions recorded in the foregoing embodiments can be modified, or some of the technical features can be replaced by equivalent features, by those skilled in the art, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A rivet for fixation of avulsion fracture, comprising a rivet body (1), the upper end of the rivet body (1) is provided with a rivet end cover (2), and the upper surface of the rivet end cover (2) is provided with a hexagonal groove (3) in the center position, which is convenient for assisting the drilling of the rivet body (1), characterized in that, The edge side of the rivet end cover (2) is provided with a threading hole (4), and the inside of the threading hole (4) is provided with a threading hole (4). The upper surface of the rivet end cover (2) is provided with a pressing piece (5), the inside of the rivet body (1) is provided with a resisting mechanism, the movement of the fixed nail (12) contained in the resisting mechanism realizes the auxiliary limiting of the pressing piece (5), and the inside of the rivet body (1) is further provided with a limiting mechanism. The stability of the rivet body (1) is improved by the movement of the auxiliary nail (11) contained in the limiting mechanism.

2. A fixation rivet for a bimalleolar ankle fracture according to claim 1, characterized in that: The threading hole (4) is arranged in four groups about the center point of the rivet end cover (2) in a ring shape, and the same suture (10) is arranged inside the threading hole (4) at the corresponding position of the inclined angle, and the suture (10) is arranged in two groups, and the two groups of sutures (10) are arranged alternately.

3. A fixation rivet for a bimalleolar ankle fracture according to claim 2, characterized in that: The suture (10) is arranged on the pressing piece (5) and is knotted and tightened, and the pressing piece (5) is located between the suture (10) and the upper surface of the rivet end cover (2). The tearing bone block and ligament can be fixed by the pressing piece (5).

4. The fixation rivet for a bimalleolar ankle fracture according to claim 1, wherein: The rivet body (1) is made of metal material, and the outer side of the rivet body (1) is coated with a coating (6), and the coating (6) is a HA coating (6) conducive to bone healing.

5. The fixation rivet for a bimalleolar ankle fracture according to claim 1, wherein: The resisting mechanism comprises a resisting through hole (14), the resisting through hole (14) is arranged at the center position of the rivet end cover (2), the inside of the rivet body (1) is provided with an auxiliary cavity (15) and a sliding groove (13), and the diameter of the auxiliary cavity (15) is greater than the maximum value of the diameters of the resisting through hole (14) and the sliding groove (13). The resisting through hole (14) is communicated with the auxiliary cavity (15) through the sliding groove (13).

6. A fixation rivet for a bimalleolar ankle fracture according to claim 5, characterized in that: The rivet end cover (2) is slidably connected with a fixed nail (12), the upper end of the fixed nail (12) is arranged in a conical structure, the inner side of the lower end of the fixed nail (12) is arranged in an inclined structure, and the lower end of the fixed nail (12) is located at the position of the auxiliary cavity (15). The fixed nail (12) is arranged in a ring shape about the center point of the rivet end cover (2).

7. A fixation rivet for a bimalleolar ankle fracture according to claim 5, wherein: The inside of the sliding groove (13) is slidably connected with an inner rod (7), the upper end of the inner rod (7) is fixedly connected with a flexible gasket (8), and the flexible gasket (8) is located at the position of the hexagonal groove (3) in the initial state. The flexible gasket (8) is located at the position of the auxiliary cavity (15) in the adjusting state, the fixed nail (12) and the rivet end cover (2) form a sliding structure through the resisting action of the flexible gasket (8), and when the flexible gasket (8) is located below the fixed nail (12), the conical part of the fixed nail (12) is in contact with the lower surface of the pressing piece (5).

8. A fixation rivet for a bimalleolar ankle fracture according to claim 7, characterized in that: The limiting mechanism comprises a receiving groove (9), the receiving groove (9) is arranged at the side of the rivet body (1), and the receiving groove (9) is arranged in a ring shape about the center point of the rivet body (1). The inside of the receiving groove (9) is slidably connected with an auxiliary nail (11), the outer end of the auxiliary nail (11) is arranged in a conical structure, and the inner end upper surface of the auxiliary nail (11) is arranged in an inclined structure.

9. A fixation rivet for a bimalleolar ankle fracture according to claim 8, characterized in that: The auxiliary nail (11) is in the interior of the accommodating groove (9) in the unused state, and the inner end inclined part of the auxiliary nail (11) is in the interior of the sliding groove (13), the lower end side of the inner rod (7) is provided in the arc-shaped structure, and the lower end of the inner rod (7) is located above the auxiliary nail (11) in the unused state, and the auxiliary nail (11) forms a sliding structure with the accommodating groove (9) through the inner rod (7).

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