Anti-dislocation ankle joint tibia prosthesis assembly

Abstract

The invention provides an anti-dislocation ankle joint tibia prosthesis assembly, and belongs to the technical field of orthopedic medical instruments. Comprising an ankle joint tibia prosthesis assembly and an auxiliary positioning assembly used for conducting auxiliary installation on the ankle joint tibia prosthesis assembly, the ankle joint tibia prosthesis assembly comprises a tibia tray, an embedded part and a chamfer cutting talus part, and the embedded part is located between the tibia tray and the chamfer cutting talus part; mounting columns for mounting the tibia and the talus are symmetrically arranged above the tibia tray and on the outer wall of one side of the bottom of the chamfer cutting talus part, an anti-dislocation limiting part is arranged in each mounting column, and anti-dislocation self-resetting structures are arranged on the embedded part and the chamfer cutting talus part close to the outer edge; the innovative design that the hollow mounting column is matched with the expansion limiting piece is combined with the nickel-titanium memory alloy material, the fixing stability of the prosthesis is remarkably improved, dislocation can be effectively prevented through the unique self-resetting structure, the secondary operation requirement is reduced, and the postoperative life quality of a patient is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of orthopedic medical devices, and more particularly to an anti-dislocation ankle joint tibial prosthesis component. Background Art

[0002] The ankle joint is composed of the tibia, the lower end of the fibula, and the talus. The medial malleolus (inside the lower end of the tibia), the lateral malleolus (outside the lower end of the fibula), and the posterior malleolus (back of the lower end of the tibia) together form a fork-like structure that tightly holds the talus in the middle. This constitutes the bony structure of the ankle joint and provides basic stability for the joint.

[0003] When the human ankle joint is injured, diseased, hyperplastic, suffers from ankle bone tumors and congenital deformities, it will cause long-term pain and obstacles in daily life. It is necessary to improve the ankle joint by replacing it and using ankle prostheses to reconstruct its function and improve the quality of life.

[0004] The current tibial prosthesis of the ankle joint mainly includes a tibial tray, an insert and a chamfered talar component. When the tibial prosthesis of the ankle joint is installed, under X-ray imaging, the auxiliary frame is first fixed to the tibia of the ankle joint, and the fixing nails are installed with the assistance of the auxiliary frame. Then the cutting auxiliary frame is installed on the fixing nails, and the pre-fastened cutting position on the cutting auxiliary frame is cut by the cutting equipment (cutting part of the tibia and part of the talus). After cutting, the cutting auxiliary frame is removed, the tibial auxiliary frame is installed inside the cutting groove, and the fixing nails are driven in. An oblique hole is opened inside the tibial cutting groove, and the insert is installed and tested. The tibial auxiliary frame is removed, the talar surface is trimmed, and a hole is punched on the talar surface. Finally, the tibial tray is installed in the tibial groove, the chamfered talar component is installed in the talar groove, and finally the insert is installed to complete the installation.

[0005] When installing the tibial prosthesis of the ankle joint, it is necessary to drill oblique holes on the bone surface inside the cut tibial groove and talar groove, and then drive the fixing columns on the tibial tray and talar component into the bone surface grooves of the tibia and talus respectively. Since the fixing columns on the tibial tray and talar component are cylindrical structures, the tibial prosthesis of the ankle joint is prone to dislocation, and the existing tibial prosthesis insert of the ankle joint and the parallel-cut talar component have a smooth sliding contact surface. After the tibial prosthesis of the ankle joint is installed and used, walking on irregular roads may cause outward sprains. After spraining the ankle, it is difficult for the insert to return to the original position, resulting in further decreased stability of the joint, causing pain, limited movement, accelerated wear of the prosthesis, and the need for secondary surgery to adjust or replace the prosthesis, which brings more pain and financial burden to the patient. Summary of the Invention

[0006] In view of the problems existing in the prior art that during the installation and use of an ankle joint tibial prosthesis, dislocation of the fixing column is likely to occur and it is difficult for the tibial tray to be accurately reset onto the chamfered cutting talus component after spraining the ankle, the purpose of the present invention is to provide an anti-dislocation ankle joint tibial prosthesis assembly.

[0007] To solve the above problems, the present invention adopts the following technical solutions.

[0008] An anti-dislocation ankle joint tibial prosthesis assembly includes an ankle joint tibial prosthesis assembly and an auxiliary positioning assembly for assisting in the installation of the ankle joint tibial prosthesis assembly. The ankle joint tibial prosthesis assembly includes a tibial tray, an insert, and a chamfered cutting talus component. The insert is located between the tibial tray and the chamfered cutting talus component. Installation columns for installing with the tibia and talus are symmetrically arranged on the upper side of the tibial tray and the outer wall of one side of the bottom of the chamfered cutting talus component. An anti-dislocation limiting member is arranged inside each installation column. An anti-dislocation self-resetting structure is arranged on the insert and the chamfered cutting talus component near the outer edge.

[0009] An installation embedding groove is formed on one side of the tibial tray away from the installation column. An embedding block that is matched and connected with the installation embedding groove is arranged on the outer wall of one side of the insert.

[0010] Optionally, the installation column is arranged in a hollow structure with openings on both sides. Expansion structure grooves are symmetrically formed on the outer walls of both sides of one end of the installation column. Inner circumferential threads are arranged on the circumferential wall in the middle of the installation column. One end of the installation column away from the expansion structure groove is connected to the tibial tray and the chamfered cutting talus component in a penetrating manner.

[0011] Optionally, the anti-dislocation limiting member includes an anti-dislocation column. Outer circumferential threads that are threadedly connected with the inner circumferential threads on the inner wall of the installation column are arranged on the outer circumferential wall of the anti-dislocation column. An inner hexagonal groove is formed at one end of the anti-dislocation column. An expansion head is connected to the end of the anti-dislocation column away from the inner hexagonal groove. The expansion head is arranged in a pear-shaped structure, and the diameter of the expansion head is less than or equal to the diameter of the installation column.

[0012] Optionally, the material of the installation column is nickel-titanium-based shape memory alloy.

[0013] Optionally, the self-resetting structure includes a self-resetting column and a reset guiding groove. The self-resetting column is installed on the outer edge of the insert near the chamfered cutting talus component. The reset guiding groove is arranged in a T-shaped structure. The reset guiding groove is correspondingly formed on the outer edge of the chamfered cutting talus component on one side of the insert. The self-resetting column is movably located inside the reset guiding groove, and the running structure of the reset guiding groove matches the structure of the chamfered cutting talus component.

[0014] Optionally, the auxiliary positioning component includes a fixing member and a positioning member for fixing the lower limbs of the human body. The fixing member includes a fixing ring for fixing and supporting the human thigh and calf. The fixing ring is arranged in a semi-circular structure. The fixing ring is uniformly and throughly provided with adjustment through holes. The two fixing rings are connected by a connecting rod. Each connecting rod is provided with a rotating adjustment seat. Each rotating adjustment seat is movably penetrated with a limiting rod for limiting the human leg. A limiting screw for fastening the limiting rod is threadedly arranged on the rotating adjustment seat.

[0015] Optionally, the positioning member includes a positioning plate. The positioning plate is perpendicular to the connecting rod. One end of the positioning plate is slidably connected to the side of the connecting rod away from the fixing ring through a sliding seat. The sliding seat is connected to the connecting rod through a fastening bolt. The positioning plate is throughly provided with a bone needle positioning hole for bone needle positioning. A positioning bone needle is arranged inside the bone needle positioning hole. The positioning bone needle is matched with the installation through hole on the external tibia cutting piece.

[0016] Optionally, a fixing plate is arranged on the top of the tibia tray close to one side of the installation column. The fixing plate is throughly provided with a fixing hole matched with the positioning bone needle.

[0017] Optionally, biocompatible coatings are arranged on the contact surfaces of the tibia tray, the embedding member and the chamfered cutting talus member.

[0018] Optionally, a pressure sensing layer is arranged on the inner circumferential wall of the fixing ring. The pressure sensing layer is electrically connected to an external display device through a wire.

[0019] The technical solution provided by the present invention has at least the following beneficial effects compared with the prior art:

[0020] In the above solution, the installation column adopts a hollow structure and is provided with an expansion structure groove, and an anti-dislocation limiting member is equipped inside. By rotating the anti-dislocation column, its pear-shaped expansion head can expand the end of the installation column to closely fit the bone surface, effectively enhancing the connection stability between the prosthesis and the bone, and reducing the dislocation risk caused by the conventional cylindrical fixing column. The installation column adopts a nickel-titanium-based shape memory alloy. The nickel-titanium-based shape memory alloy has a shape memory effect and superelasticity. After being implanted into the human body, it can better adapt to the human body temperature and the bone mechanical environment, further improving the fixing effect and reducing loosening and dislocation caused by stress changes.

[0021] A self - resetting structure is provided at the outer edge of the insert and the chamfer - cut talus component, which consists of a self - resetting column and a T - shaped reset guiding groove. When an ankle sprain occurs outward, the self - resetting column can move and reset within the reset guiding groove, enabling the insert to return to its initial position, reducing the risk of dislocation, maintaining the stability of the joint, and reducing pain, limited mobility, and prosthesis wear caused by dislocation due to ankle sprain.

[0022] The auxiliary positioning component includes a fixing part and a positioning part. The fixing part can firmly fix the lower limb of the human body. The positioning plate of the positioning part is connected to the connecting rod through a sliding seat, and its position can be flexibly adjusted. The positioning bone pin matches the fixing holes on the external tibia cutting part and the tibia tray, which can ensure the accurate installation position of the prosthesis, improve the success rate of the operation. There are through - holes for bone pin positioning on the positioning plate in the positioning part. The internal positioning bone pin matches the installation through - holes on the external tibia cutting part, and the fixing plate on the tibia tray is provided with fixing holes that match the position of the positioning bone pin. This enables more accurate positioning of the tibia tray during the installation process, improves the installation accuracy, and reduces the wear problem caused by misalignment of the joint prosthesis.

[0023] Biocompatible coatings are provided on the contact surfaces of the tibia tray, the insert, and the chamfer - cut talus component. They can not only promote the bonding of bone tissue and the prosthesis, enhance the fixation effect, but also reduce friction, decrease wear, and extend the service life of the prosthesis.

[0024] The pressure - sensing layer on the inner circumferential wall of the fixing ring is electrically connected to an external display device. Medical staff can monitor the pressure of the fixing ring on the human leg in real time, adjust the fixing force in a timely manner, avoid damaging the patient's leg due to improper pressure, and improve the comfort of the patient's wearing.

[0025] Multiple anti - dislocation and stability designs can effectively reduce the possibility of dislocation and loosening of the ankle joint tibia prosthesis, reduce the situation where patients need secondary surgical adjustment or prosthesis replacement due to joint problems, and relieve the pain of patients. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings incorporated herein and constituting a part of the specification illustrate embodiments of the present invention and, together with the specification, are further used to explain the principles of the present invention and enable those skilled in the relevant art to implement and use the present invention.

[0027] Figure 1 It is an isometric view of the three - dimensional structure of the present invention;

[0028] Figure 2 It is an exploded view of the overall ankle joint tibia prosthesis assembly of the present invention;

[0029] Figure 3 It is a schematic diagram of the structure of the installation column of the present invention;

[0030] Figure 4 Schematic structural diagram of the dislocation prevention and limiting member of the present invention;

[0031] Figure 5 Schematic structural diagram of the self-resetting structure between the embedding member and the chamfer-cutting talus member of the present invention;

[0032] Figure 6 Schematic diagram of the self-resetting column inside the reset guiding groove of the present invention;

[0033] Figure 7 Side view of the overall ankle joint tibial prosthesis assembly of the present invention;

[0034] Figure 8 Schematic structural diagram of the overall auxiliary positioning assembly of the present invention;

[0035] Figure 9 Side view of the external opening positioning plate installed on the positioning bone pin of the present invention.

[0036] [Reference numerals]

[0037] 1. Ankle joint tibial prosthesis assembly;

[0038] 11. Tibial tray; 111. Installation embedding groove; 112. Fixed plate; 113. Fixed hole;

[0039] 12. Embedding member; 121. Embedding block;

[0040] 13. Chamfer-cutting talus member;

[0041] 14. Installation column; 141. Expansion structure groove; 142. Inner circumferential thread;

[0042] 15. Dislocation prevention and limiting member; 151. Dislocation prevention column; 152. Outer circumferential thread; 153. Inner hexagon groove; 154. Expansion head;

[0043] 16. Self-resetting column; 161. Reset guiding groove;

[0044] 2. Auxiliary positioning assembly;

[0045] 21. Fixing member; 211. Fixing ring; 212. Adjusting through hole; 213. Connecting rod; 214. Rotating adjusting seat; 215. Limiting rod; 216. Limiting screw;

[0046] 22. Positioning member; 221. Positioning plate; 222. Sliding seat; 223. Bone pin positioning hole; 224. Positioning bone pin.

[0047] As shown in the figure, in order to clearly implement the structure of the embodiments of the present invention, specific structures and devices are labeled in the figure. However, this is only for illustrative purposes and is not intended to limit the present invention to this specific structure, device, and environment. According to specific needs, those of ordinary skill in the art can adjust or modify these devices and environments. Detailed implementation manners

[0048] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. At the same time, it should be noted here that in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments. For some well-known technologies, those skilled in the art can also adopt other alternative methods for implementation; moreover, the accompanying drawings are only for more specifically describing the embodiments and are not intended to specifically limit the present invention.

[0049] It should be noted that in the specification, references to "one embodiment", "an embodiment", "exemplary embodiments", "some embodiments", etc. indicate that the described embodiments may include specific features, structures, or characteristics, but not necessarily every embodiment includes such specific features, structures, or characteristics. Additionally, when combining embodiments to describe specific features, structures, or characteristics, implementing such features, structures, or characteristics in combination with other embodiments (whether explicitly described or not) should be within the knowledge of those skilled in the relevant art.

[0050] Generally, terms can be understood, at least in part, from their use in context. For example, at least in part depending on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in a singular sense, or can be used to describe a combination of features, structures, or characteristics in a plural sense. Additionally, the term "based on" can be understood as not necessarily intended to convey a set of exclusive factors, but rather, at least in part depending on the context, can allow for the existence of other factors that may not be explicitly described.

[0051] It can be understood that the meanings of "on...", "above...", and "over..." in the present invention should be interpreted in the broadest manner, such that "on..." not only means "directly on" something, but also includes the meaning of being "on" something with intermediate features or layers therebetween, and "above..." or "over..." not only means "above" or "over" something, but also can include the meaning of being "above" or "over" something with no intermediate features or layers therebetween.

[0052] In addition, spatial relative terms such as "under", "below", "lower part", "above", "upper part", etc. may be used in this text for convenience of description to describe the relationship between one element or feature and another or more elements or features, as shown in the drawings. The spatial relative terms are intended to cover different orientations in the use or operation of the device other than the orientation depicted in the drawings. The device may be oriented in other ways, and the spatial relative descriptive words used in this text may be correspondingly interpreted similarly.

[0053] As Figures 1 to 9 shown, an embodiment of the present invention provides an anti-dislocation ankle joint tibial prosthesis assembly, including an ankle joint tibial prosthesis assembly 1 and an auxiliary positioning assembly 2 for assisting in the installation of the ankle joint tibial prosthesis assembly 1. The auxiliary positioning assembly 2 is used to position and fix the limb, preventing the limb from shifting during the operation, resulting in problems such as inaccurate cutting or damage to surrounding tissues, thereby ensuring the accuracy and safety of the operation. The ankle joint tibial prosthesis assembly 1 includes a tibial tray 11, an insert 12, and a chamfer cutting talus member 13. The insert 12 is located between the tibial tray 11 and the chamfer cutting talus member 13, playing a role of connection and stability. An installation insert groove 111 is provided on the bottom of the tibial tray 11. An insert block 121 that is matched and connected with the installation insert groove 111 is provided on the outer wall of one side of the insert 12. The insert block 121 is precisely fitted into the installation insert groove 111 to ensure the stability of the overall structure of the prosthesis assembly, reduce the risk of postoperative loosening, and improve the rehabilitation effect of the patient. Biocompatible coatings are provided on the contact surfaces of the tibial tray 11, the insert 12, and the chamfer cutting talus member 13, which can not only promote the combination of bone tissue and the prosthesis, enhance the fixation effect, but also reduce friction, reduce wear, and extend the service life of the prosthesis.

[0054] On the outer walls of the tibial tray 11 and the chamfered cutting talus component 13 away from the middle side, mounting posts 14 for installing with the tibia and talus are symmetrically arranged. The material of the mounting posts 14 is nickel-titanium-based shape memory alloy, which effectively improves the stability and durability of the prosthesis assembly and is suitable for complex surgical environments. The nickel-titanium-based shape memory alloy has shape memory characteristics and can automatically recover the preset shape at body temperature to ensure firm installation. Inside each mounting post 14, a dislocation-preventing limiting member 15 is provided. The dislocation-preventing limiting member 15 limits the mounting post 14 to prevent the mounting post 14 from slipping out of the mounting groove on the bone surface, resulting in the problem of dislocation. The mounting post 14 is arranged in a hollow structure with openings on both sides. The hollow structure through the openings on both sides facilitates the installation and adjustment of the dislocation-preventing limiting member 15. The dislocation-preventing limiting member 15 is made of high-strength medical materials and has excellent biocompatibility, which can effectively prevent the prosthesis from shifting and improve the success rate of the operation. On the outer walls on both sides of one end of the mounting post 14, expansion structure grooves 141 are symmetrically opened. On the circumferential wall of the middle part of the inner ring of the mounting post 14, an internal circumferential thread 142 is provided. One end of the mounting post 14 away from the expansion structure groove 141 is connected to the tibial tray 11 and the chamfered cutting talus component 13 in a penetrating manner. The penetrating connection facilitates fine adjustment of the dislocation-preventing limiting member 15 inside the mounting post 14 to ensure its stability during the operation, further improving the fit between the prosthesis and the bone, reducing postoperative complications. The dislocation-preventing limiting member 15 includes a dislocation-preventing post 151. On the outer circumferential wall of the dislocation-preventing post 151, an external circumferential thread 152 that is threadedly connected to the internal circumferential thread 142 on the inner wall of the mounting post 14 is provided. An internal hexagonal groove 153 is opened at one end of the dislocation-preventing post 151. A swelling head 154 is connected to the end of the dislocation-preventing post 151 away from the internal hexagonal groove 153. The swelling head 154 is arranged in a pear-shaped structure, and the diameter of the swelling head 154 is less than or equal to the diameter of the mounting post 14. The dislocation-preventing post 151 is tightly fitted with the internal circumferential thread 142 through the external circumferential thread 152. When the dislocation-preventing post 151 is rotated, the swelling head 154 follows the displacement. The swelling head 154 abuts against the mounting post 14 at the expansion structure groove 141, and the mounting post 14 is compressed and expanded, tightly embedded in the bone groove, enhancing the fixing effect, preventing loosening, ensuring long-term stability, and improving the postoperative quality of life of the patient.

[0055] When the anti-dislocation limiter 15 needs to be installed, the anti-dislocation column 151 is screwed into the mounting column 14 at one end away from the expansion head 154 through a thread. At this time, the inner circumferential thread 142 of the mounting column 14 is precisely engaged with the outer circumferential thread 152 of the anti-dislocation column 151. After installation, the mounting column 14 on the tibial tray 11 is inserted into the bone groove. Observe from the opening on the side of the tibial tray 11 away from the bone groove to ensure that the mounting column 14 is accurately aligned with the bone groove. Insert the hexagonal rod into the inner hexagonal groove 153 at the end of the anti-dislocation column 151 in the mounting column 14, rotate the hexagonal rod to rotate the anti-dislocation column 151, and the expansion head 154 gradually embeds into the expansion structure groove 141. The outer wall of the mounting column 14 expands accordingly, tightly fitting the inner wall of the bone groove to form a stable lock, effectively preventing the prosthesis from shifting, and ensuring that the surgical effect is long-lasting and stable.

[0056] The diameter of the expansion head 154 is less than or equal to the diameter of the installation column 14, ensuring that when the installation column 14 drives the anti-dislocation column 151 to insert into the bone groove, the expansion head 154 will not contact the inner wall of the bone groove in advance, avoiding obstruction during the installation process, ensuring smooth installation, and ultimately achieving a perfect fit between the anti-dislocation column 151 and the bone groove, further improving the stability and safety of the prosthesis.

[0057] When the tibial tray 11 needs to be adjusted or replaced, it is only necessary to rotate the hexagonal rod in the opposite direction to make the anti-dislocation column 151 withdraw from the expansion structure groove 141, and the outer wall of the mounting column 14 will shrink, so that the prosthesis can be easily taken out. The operation is simple, reduces the patient's pain, improves the efficiency of the operation, ensures that each adjustment or replacement can be completed quickly, does not affect the overall treatment effect, and ensures the patient's smooth recovery after surgery.

[0058] The mounting column 14 of the present application adopts a hollow structure and is provided with an expansion structure groove 141, and is equipped with an anti-dislocation limiter 15 inside. By rotating the anti-dislocation column 151, its pear-shaped expansion head 154 can expand the end of the mounting column 14 and fit tightly with the bone surface, effectively enhancing the connection stability between the prosthesis and the bone, and reducing the risk of dislocation caused by conventional cylindrical fixing columns. The mounting column 14 is made of nickel-titanium-based memory alloy, which has shape memory effect and superelasticity. After being implanted in the human body, it can better adapt to the human body temperature and bone mechanical environment, further improve the fixation effect, and reduce loosening and dislocation caused by stress changes.

[0059] Please see the attached Figure 2 、 Figure 5 、 Figure 6 and Figure 7As shown, the insert 12 and the chamfered cut talar member 13 are provided with a self-resetting structure for preventing sprains and dislocation near the outer edges. The insert 12 and the chamfered cut talar member 13 realize the movement of the foot by sliding back and forth. The chamfered cut talar member 13 is provided with an arc structure near the outer edges on both sides. The arc structure can effectively disperse the pressure of the foot, reduce local wear and tear, and improve comfort. The insert 12 does not directly contact the chamfered cut talar member 13 near the outer edge, and a small gap is reserved to ensure free movement of the foot. At the same time, excessive friction is prevented, and the service life of the prosthesis is extended. The self-resetting structure includes a self-resetting column 16 and a reset guide groove 161. The self-resetting column 16 is installed on the outer edge of the insert 12 on the side near the chamfered cut talar member 13, and the reset guide groove 161 is arranged in a T-shaped structure. The reset guide groove 161 is opened on the outer edge of the chamfered cut talar member 13 on the side of the corresponding insert 12. The direction structure of the reset guide groove 161 matches the structure of the chamfered cut talar member 13, and the self-resetting structure is self-resetting. When the self-resetting post 16 is located inside the reset guide groove 161, it automatically moves with the movement of the foot. At this time, the outer wall of the self-resetting post 16 does not generate friction with the inner wall of the reset guide groove 161, preventing the self-resetting post 16 from interfering with the normal movement of the foot during normal movement. When the foot is sprained when walking outward, the self-resetting post 16 moves outward with the insert 12. At this time, the self-resetting post 16 generates friction with the reset guide groove 161 and moves outward inside the structural groove of the reset guide groove 161. When the sprain force disappears, the self-resetting post 16 6. Following the reset displacement of the insert 12 (after the force of the sprain disappears, the person automatically drives the ankle joint to reset. Under the guidance of the T-shaped reset guide groove 161, the insert 12 drives the self-resetting post 16 to reset). Because the reset guide groove 161 is T-shaped, the person's ankle is affected by the ankle joint structure and the sprain is outward. The self-resetting post 16 moves outward within the T-shaped reset guide groove 161. Due to the structural constraints of the reset guide groove 161, the self-resetting post 16 will not fall out of the reset guide groove 161. At this time, the self-resetting post 16 automatically returns to its original position under the guidance of the reset guide groove 161, effectively preventing dislocation, enhancing joint stability, improving the patient's walking safety, reducing postoperative complications, and ensuring long-term use.

[0060] The self-resetting structure of the present application is ingeniously designed, and the reduction process is smooth and unobstructed, which significantly reduces wear during the reduction process, extends the service life of the prosthesis, and at the same time reduces the patient's postoperative recovery time and improves the quality of life.

[0061] Self-resetting structures are provided at the outer edges of the insert 12 and the chamfered cutting talus member 13, which are composed of a self-resetting post 16 and a T-shaped reset guiding groove 161. When an ankle sprain occurs outwardly, the self-resetting post 16 can move and reset within the reset guiding groove 161, and the insert 12 returns to its initial position, reducing the risk of dislocation, maintaining the stability of the joint, and reducing pain, limited mobility, and prosthesis wear caused by ankle sprain dislocation. The self-resetting post 16 is connected to the insert 12. When the insert 12 returns to its initial position, the self-resetting post 16 can move and reset within the reset guiding groove 161.

[0062] Please refer to the attached Figure 1 , Figure 8 and Figure 9 As shown, the auxiliary positioning assembly 2 includes a fixing member 21 for fixing the human lower limb and a positioning member 22. The fixing member 21 includes a fixing ring 211 for fixing and supporting the human thigh and calf. The fixing ring 211 is arranged in a semicircular structure. A pressure sensing layer is provided on the inner circumferential wall of the fixing ring 211. The pressure sensing layer is electrically connected to an external display device through a wire. By monitoring the pressure change in real time, the fixing effect is ensured, secondary injuries caused by improper fixation are avoided, the surgical safety and the postoperative recovery efficiency are improved. Adjusting through holes 212 are uniformly and penetratingly formed on the fixing ring 211. A plurality of elastic straps are provided on the outer circumferential wall of the fixing ring 211. One end of the elastic strap is fixedly connected to the fixing ring 211, and the other end is provided with a magic tape. Through the cooperation of the elastic strap and the magic tape, the fixing effect of the fixing ring 211 on the human leg can be further enhanced, and the fixing ring 211 is prevented from shifting during use. The two fixing rings 211 are connected by a connecting rod 213. A rotating adjustment seat 214 is provided on each connecting rod 213. A limiting rod 215 for limiting the human leg is movably and penetratingly arranged inside each rotating adjustment seat 214. The extending direction of the limiting rod 215 is perpendicular to the extending direction of the connecting rod 213. (For fixing and limiting the human leg from the side) A breathable hollow rubber pad is provided at the end of the limiting rod 215. The rubber pad abuts against the human leg. A limiting screw 216 for fastening the limiting rod 215 is threadedly arranged on the rotating adjustment seat 214. Through the adjustment of the limiting screw 216, the limiting rod 215 can be accurately positioned. The limiting rod 215 replaces the existing built-in bone needle method during joint positioning, effectively avoiding the trauma and infection risks brought by the bone needle.

[0063] As Figures 7 to 9As shown, the positioning member 22 includes a positioning plate 221 which is perpendicular to the connecting rod 213. One end of the positioning plate 221 is slidably connected to the side of the connecting rod 213 away from the fixed ring 211 through a sliding seat 222. A bone needle positioning hole 223 for bone needle positioning is formed through the positioning plate 221. A positioning bone needle 224 is arranged inside the bone needle positioning hole 223. The positioning bone needle 224 is matched with the installation through hole on the external tibia cutting member. At the top of the tibia tray 11 near one side of the installation column 14, a fixing plate 112 is provided. A fixing hole 113 matched with the positioning bone needle 224 is formed through the fixing plate 112. Since the positioning bone needle 224 is matched with the installation through hole on the external tibia cutting member, through the precise docking of the fixing hole 113 on the tibia tray 11 and the positioning bone needle 224, it is ensured that the tibia tray 11 can be stably fixed at a predetermined position, preventing the tibia tray 11 from shifting during the operation, thereby improving the surgical precision and stability, reducing postoperative complications, and accelerating the patient's recovery process.

[0064] One end of the positioning plate 221 is slidably connected to the side of the connecting rod 213 away from the fixed ring 211 through a sliding seat 222. The sliding seat 222 is provided with a locking device for adjusting the position of the positioning plate 221 to ensure that the bone needle positioning hole 223 is precisely aligned with the anterior position of the tibia cutting under X-ray imaging. After the leg is limited and fixed by the fixing member 21, under X-ray imaging, first fix the positioning plate 221 at the tibia of the ankle joint, and by adjusting the locking device, make the positioning plate 221 completely aligned with the anterior position of the tibia cutting. Then insert the positioning bone needle 224 to ensure that the tibia tray 11 is closely attached to the tibia, avoiding surgical errors. The external auxiliary cutting device uses the positioning bone needle 224 as a positioning point for precise cutting. After the cutting and bone surface treatment are completed, precisely dock the fixing hole 113 on the fixing plate 112 of the tibia tray 11 with the positioning bone needle 224, and install the tibia tray 11 downward. At this time, the installation column 14 on the tibia tray 11 is embedded inside the bone surface groove, further stabilizing the combination of the tibia tray 11 and the bone surface, ensuring the accuracy of the surgical operation, effectively reducing the surgical risk, and improving the postoperative recovery effect.

[0065] The auxiliary positioning component 2 of the present application includes a fixing member 21 and a positioning member 22. The fixing member 21 can firmly fix the lower limb of the human body. The positioning plate 221 of the positioning member 22 is connected to the connecting rod 213 through a sliding seat 222, and the position can be flexibly adjusted. The positioning bone needle 224 matches the fixing hole 113 on the external tibia cutting member and the tibial tray 11, which can ensure the accurate installation position of the prosthesis, improve the success rate of the operation. The bone needle positioning hole 223 for bone needle positioning is formed through the positioning plate 221 in the positioning member 22. The internally arranged positioning bone needle 224 matches the installation through hole on the external tibia cutting member, and the fixing plate 112 on the tibial tray 11 is provided with a fixing hole 113 that matches the position of the positioning bone needle 224. This enables more accurate positioning of the tibial tray 11 during the installation process, improves the installation accuracy, and reduces the wear problem caused by the dislocation of the joint prosthesis.

[0066] The working process of the technical solution provided by the present invention is as follows:

[0067] When the present invention is in use, place the patient's lower limb in the fixing ring 211, adjust it to non-invasive fastening through the limiting rod 215 (the pressure sensing layer shows <30 kPa) to avoid nerve compression, and use the elastic bandage for auxiliary fixation. Under X-ray imaging, slide the positioning plate 221 to the tibia cutting position, insert the positioning bone needle 224, align it with the external cutting guide plate, and use the matching tool to perform tibia / talus cutting based on the positioning bone needle 224 to form a bone groove matching the prosthesis (the groove for installing the overall ankle joint prosthesis). Open an installation groove on the bone surface (the installation groove is divided into a tibia groove and a talus groove for fixing the installation column 14). Remove the auxiliary positioning component 2, align the fixing hole 113 of the tibial tray 11 with the positioning bone needle 224 and insert it, so that the installation column 14 is embedded in the tibia groove. Rotate the anti-displacement column 151 with a hexagon tool, and the expansion head 154 expands the installation column 14 to complete the in-bone locking. Install the insert 12 and the chamfered cutting talus member 13 for testing. After the movement is flexible, remove the insert 12 and the chamfered cutting talus member 13, embed the installation column 14 on the chamfered cutting talus member 13 into the talus groove, rotate the anti-displacement column 151 with a hexagon tool, and the expansion head 154 expands the installation column 14 to complete the in-talus locking. Embed the insert 12 into the inside of the tibial tray 11 so that the installation insert groove 111 and the insert block 121 are mutually engaged to ensure the stable fixation of the insert 12, prevent postoperative loosening, improve joint stability, and finally achieve the perfect fit between the prosthesis and the bone, ensuring the patient's free movement after the operation.

[0068] The present invention encompasses any alternatives, modifications, equivalent methods, and solutions that fall within the spirit and scope of the present invention. To enable the public to have a thorough understanding of the present invention, specific details are set forth in the following preferred embodiments of the present invention. However, those skilled in the art can fully understand the present invention even without the description of these details. Additionally, well-known methods, processes, procedures, components, and circuits are not described in detail to avoid unnecessary confusion with the essence of the present invention.

[0069] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. An anti-dislocation ankle joint tibial prosthesis assembly, comprising an ankle joint tibial prosthesis assembly and an auxiliary positioning assembly for assisting in the installation of the ankle joint tibial prosthesis assembly, characterized in that, The ankle joint tibial prosthesis assembly includes a tibial tray, an insert, and a chamfered talus cutting piece. The insert is located between the tibial tray and the chamfered talus cutting piece. Mounting posts for mounting with the tibia and talus are symmetrically arranged on the upper side of the tibial tray and the outer wall of one side of the bottom of the chamfered talus cutting piece. An anti-displacement limiting member is arranged inside each mounting post. A self-resetting structure for anti-displacement is arranged on the insert and the chamfered talus cutting piece near the outer edge. An installation embedding groove is provided on one side of the tibial tray away from the mounting post. An embedding block that is matched and connected with the installation embedding groove is arranged on the outer wall of one side of the insert.

2. The anti-dislocation ankle joint tibial prosthesis assembly according to claim 1, wherein The mounting post is arranged in a hollow structure with openings on both sides. Expansion structure grooves are symmetrically opened on the outer walls of both sides at one end of the mounting post. Inner circumferential threads are arranged on the circumferential wall in the middle of the mounting post. One end of the mounting post away from the expansion structure groove is connected to the tibial tray and the chamfered talus cutting piece in a penetrating manner.

3. The anti-dislocation ankle joint tibial prosthesis component according to claim 1, wherein The anti-displacement limiting member includes an anti-displacement post. Outer circumferential threads that are threadedly connected with the inner circumferential threads on the inner wall of the mounting post are arranged on the outer circumferential wall of the anti-displacement post. An inner hexagonal groove is opened at one end of the anti-displacement post. An expansion head is connected to the end of the anti-displacement post away from the inner hexagonal groove. The expansion head is arranged in a pear-shaped structure, and the diameter of the expansion head is less than or equal to the diameter of the mounting post.

4. The anti-dislocation ankle joint tibial prosthesis assembly according to claim 1, characterized in that, The material of the mounting post is nickel-titanium-based shape memory alloy.

5. The anti-dislocation ankle joint tibial prosthesis assembly according to claim 1, wherein The self-resetting structure includes a self-resetting post and a reset guiding groove. The self-resetting post is installed on the outer edge of the insert near the chamfered talus cutting piece. The reset guiding groove is arranged in a T-shaped structure. The reset guiding groove is correspondingly opened on the outer edge of the chamfered talus cutting piece on one side of the insert. The self-resetting post is movably located inside the reset guiding groove, and the running structure of the reset guiding groove matches the structure of the chamfered talus cutting piece.

6. The anti-dislocation ankle joint tibial prosthesis assembly according to claim 1, characterized in that, The auxiliary positioning assembly includes a fixing member and a positioning member for fixing the human lower limb. The fixing member includes a fixing ring for fixing and supporting the human thigh and calf. The fixing ring is arranged in a semi-circular structure. Adjustment through holes are uniformly and penetratingly opened on the fixing ring. The two fixing rings are connected by a connecting rod. A rotating adjustment seat is arranged on each connecting rod. A limiting rod for limiting the human leg is movably penetrated through each rotating adjustment seat. A limiting screw for fastening the limiting rod is threadedly arranged on the rotating adjustment seat.

7. The anti-dislocation ankle joint tibial prosthesis assembly according to claim 6, characterized in that, The positioning member includes a positioning plate. The positioning plate is perpendicular to the connecting rod. One end of the positioning plate is slidably connected to the side of the connecting rod away from the fixing ring through a sliding seat. The sliding seat is connected to the connecting rod through a fastening bolt. A bone needle positioning hole for bone needle positioning is penetratingly opened on the positioning plate. A positioning bone needle is arranged inside the bone needle positioning hole. The positioning bone needle is matched with the installation through hole on the external tibia cutting piece.

8. The anti-dislocation ankle joint tibial prosthesis assembly according to claim 7, characterized in that One side of the tibial tray close to the mounting post is provided with a fixing plate at the top, and a fixing hole matching the positioning bone needle is formed through the fixing plate.

9. The anti-displacement ankle joint tibial prosthesis assembly according to claim 1, wherein, Biocompatible coatings are provided on the contact surfaces of the tibial tray, the insert and the chamfered talus cutting member.

10. The anti-dislocation ankle joint tibial prosthesis assembly according to claim 7, characterized in that, A pressure sensing layer is provided on the inner circumferential wall of the fixing ring, and the pressure sensing layer is electrically connected to an external display device through a wire.

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