69 results about "Ankle joint prosthesis" patented technology

The invention relates to the technical field of joint prostheses, in particular to an ankle joint prosthesis implantation system based on zirconium-niobium alloy, which comprises a tibia prosthesis (10), a talus prosthesis (30) and a liner (20), the tibia prosthesis (10) and the talus prosthesis (30) are both made of zirconium-niobium alloy material and are integrally formed by 3D printing, the tibia prosthesis (10) comprises a tibia body (101), and the liner (20) is arranged on the tibia body (101). The first bone contact layer (100) is integrally formed on the tibia body (101), and the first bone contact layer (100) is of a porous structure of which the pore diameter is gradually reduced from outside to inside; the talus prosthesis (30) comprises a talus body (301) and a second bone contact layer (300) integrally formed on the talus body (301), and the second bone contact layer (300) is of a porous structure with the aperture gradually reduced from outside to inside.

The invention discloses an electro-hydrostatic active ankle joint artificial limb and a walking method, and relates to the technical field of artificial limb technologies and additive manufacturing. The electro-hydrostatic active ankle joint artificial limb comprises a motor pump, a hydraulic cylinder, a hydraulic manifold block, an energy accumulator set and an integrated topological sole; the motor pump, the hydraulic cylinder, the energy accumulator set and the integrated topological sole are all integrated on the hydraulic manifold block, the motor pump is used for charging energy to the energy accumulator set, the motor pump and the energy accumulator set are both used for being connected with the hydraulic cylinder, and the hydraulic cylinder is used for being connected with the integrated topological sole. According to the electro-hydrostatic active ankle joint artificial limb and the walking method, the motor pump, the hydraulic cylinder, the energy accumulator set and the integrated topological sole are all integrated on the hydraulic manifold block, and the overall size and weight are reduced.

An ankle joint replacement prosthesis comprises a tibia prosthesis assembly and a talus prosthesis, the tibia prosthesis assembly comprises a tibia prosthesis body and a cushion block, the tibia prosthesis body and the cushion block are in an arc shape with the middle bent upwards on the sagittal plane, the cushion block is arranged at the bottom of the tibia prosthesis body in a sleeving mode, and the surface of the upper portion of the tibia prosthesis body is a tibia joint face. The surface of the lower portion of the cushion block is a first articular surface, the surface of the upper portion of the talus prosthesis is a second articular surface, the second articular surface is in an arc shape with the middle bent upwards on a sagittal plane, the surface of the lower portion of the talus prosthesis is a talus joint surface, and the first articular surface is matched with the second articular surface. When the prosthesis is implanted, only the articular cartilage and the subchondral bone need to be treated at the far end of the tibia, so that the bone at the far end of the tibia is reserved to the maximum extent, the anatomical integrity of the bone is guaranteed, the stability of the prosthesis is enhanced, the service life is prolonged, and the clinical operation effect is improved.

A method of ankle replacement includes forming an anterior cut in a bone and forming a stem hole in a distal end of the bone. The stem hole is formed using a plurality of broaches positioned against the distal end of the bone through the anterior cut. A first portion and a second portion of a stem implant are inserted into the stem hole through the anterior cut in the bone. The first portion is coupled to the second portion using a coupling device inserted through the anterior cut in the bone. The stem implant is impacted into the stem hole using an offset impactor.

The utility model provides a multi-curvature ankle joint prosthesis which comprises a tibia prosthesis connected with a tibia, a talus prosthesis connected with a talus and a cushion block with one side connected with the tibia prosthesis, a joint contact surface is arranged on the other side of the cushion block, and a talus contact surface matched with the joint contact surface is arranged on one side of the talus prosthesis. The curvature of the sagittal plane Z in the talus contact face is reduced from front to back, and the instantaneous rotation center of the talus prosthesis on the joint contact face is in an arc shape. According to the multi-curvature ankle joint prosthesis, the talus contact face and the anatomical structure of the human body are high in consistency, the natural form and the motion mode of the ankle joint are accurately restored, the ankle joint prosthesis better conforms to biomechanics and kinematics in the motion process, the motion stability of the human body is improved, local friction stress of the ankle joint prosthesis is smaller, and the ankle joint prosthesis is more stable in motion. And the service life of the ankle joint prosthesis is prolonged, so that the durability of the ankle joint prosthesis is improved.

The invention relates to the technical field of joint prostheses, in particular to an ankle joint prosthesis based on a bionic bone trabecula, the ankle joint prosthesis comprises a tibia prosthesis (10), a talus prosthesis (30) and a liner (20), the tibia prosthesis (10) and the talus prosthesis (30) are both made of metal materials and are integrally formed through 3D printing, the tibia prosthesis (10) comprises a tibia body (101), and the liner (20) is arranged on the tibia body (101). The first bone contact layer (100) is integrally formed on the tibia body (101), and the first bone contact layer (100) is of a porous structure of which the pore diameter is gradually reduced from outside to inside; the talus prosthesis (30) comprises a talus body (301) and a second bone contact layer (300) integrally formed on the talus body (301), and the second bone contact layer (300) is of a porous structure with the aperture gradually reduced from outside to inside.

The ankle joint prosthesis comprises a tibia prosthesis and a talus prosthesis, the tibia prosthesis is provided with a keel, the keel is used for being implanted into a tibia and extends in the front-back direction of the tibia prosthesis, the talus prosthesis is arranged on the lower side of the tibia prosthesis, the talus prosthesis is provided with a fixing rod, and the fixing rod is arranged on the lower side of the tibia prosthesis. The fixing rod is used for being implanted into the talus and obliquely extends downwards from front to back, an included angle alpha is formed between the extending direction of the keel and the extending direction of the fixing rod, and alpha is larger than or equal to 10 degrees and smaller than or equal to 85 degrees. The ankle joint prosthesis is reasonable in structural design, the stability of the ankle joint prosthesis in the human body movement process can be enhanced, and the dislocation risk of the prosthesis is reduced.

The knee joint linkage control ankle joint prosthesis comprises a base and a joint head, the base is connected with a foot plate piece, a hinge shaft is hinged to the base, the hinge shaft extends in the length direction perpendicular to the foot plate piece, the joint head is connected with a support, the supporting end of the support is connected with the hinge shaft, and a hinge piece is hinged to the support. The hinge piece is arranged close to the joint head and extends in the length direction perpendicular to the foot plate piece, a joint motor is hinged to the base, an output shaft of the joint motor is connected with a threaded rod, the threaded rod extends in the length direction perpendicular to the hinge piece, and the threaded rod is in threaded connection with a through hole in the hinge piece. A driving piece is connected between the shank piece and the thigh connecting piece, the shank piece is driven by the driving piece to rotate, and a controller on the shank piece is connected with the joint motor and the driving piece. The motion performance of the artificial limb is optimized through knee and ankle joint linkage control, proper supporting force and motion resistance are provided, the dynamic response capacity is improved, and therefore the walking stability and comfort of a patient are enhanced.

The invention provides a preoperative planning method, device and equipment for ankle joint replacement and a computer readable storage medium. The preoperative planning method for ankle joint replacement is applied to an orthopedic surgery robot system, and the preoperative planning method for ankle joint replacement comprises the following steps: acquiring an ankle joint CT image of a patient; carrying out segmentation and three-dimensional reconstruction on the CT image of the ankle joint to obtain an ankle joint three-dimensional model; on the basis of the three-dimensional model of the ankle joint, key parameters of the ankle joint are determined, and an ankle joint prosthesis model is determined on the basis of the key parameters of the ankle joint; determining a preoperative planning method for ankle joint replacement based on the ankle joint key parameters and the ankle joint prosthesis model; wherein the preoperative planning scheme comprises a placement position and a placement angle of the ankle joint prosthesis model.

The invention discloses a preoperative planning method and system based on a three-dimensional ankle joint replacement CT image, and the method comprises the steps: carrying out the data processing of to-be-processed ankle joint image data through a statistical model, and constructing a three-dimensional average ankle joint point cloud model; registering the three-dimensional average ankle joint point cloud model with ankle joint image data to be processed through a CPD non-rigid point cloud registration algorithm to obtain an ankle joint prosthesis placement position; performing data prediction on the to-be-processed ankle joint image data through a random forest algorithm to obtain ankle joint prosthesis type data; and three-dimensional ankle joint replacement preoperative planning is realized by combining the ankle joint prosthesis placement position and the ankle joint prosthesis body size data. According to the method, the accurate ankle joint registration result can be achieved in the three-dimensional space by reducing the difference between individuals. The preoperative planning method and system based on the three-dimensional ankle joint replacement CT image can be widely applied to the technical field of ankle joint surgical planning.

The invention provides an artificial prosthesis assembly for an ankle joint replacement operation, and belongs to the technical field of ankle joint prostheses. Comprising a talus arc plate, an arc-shaped guide rail is installed at the top of the talus arc plate, rivets are installed in the talus arc plate, a joint soft plate is connected to the top of the arc-shaped guide rail in a sliding mode, and a tibia installation plate is installed above the joint soft plate; and a rivet fixing assembly is mounted at the top of the tibia mounting plate. By arranging the elastic adjusting assembly and the sliding lubricating assembly, the contact area with bone tissue can be remarkably increased, the initial stability of the prosthesis is enhanced, the separation risk of the prosthesis is reduced, and the elastic relaxation degree of the prosthesis is adjusted and controlled, so that the modulus of the prosthesis is dynamically matched with the bone elasticity of a patient, and the bone interface stress concentration risk of the prosthesis is reduced; meanwhile, the movement resistance of the prosthesis is reduced through ball lubrication, material fatigue and loss caused by dry friction between the prostheses are avoided, and the service life of the prosthesis is prolonged.

The present disclosure relates to an instrumentation system for implanting an ankle prosthesis. In various embodiments, the system includes a cutting assembly including a reaming tool for preparing a cavity within an intramedullary canal of a patient. In further embodiments, the system includes a guide block configured to fasten to a tibia of the patient and couple to the cutting assembly, the tibia having a proximal end and a distal end, wherein the guide block includes one or more alignment guides for guiding the cutting assembly to the intramedullary canal on the distal end for preparing the cavity without affecting a calcaneus or the proximal end of the tibia. In some embodiments, the system includes a distractor for separating the distal tibia from a talus to facilitate preparing the cavity and inserting an ankle prosthesis into the cavity.

The invention discloses a three-degree-of-freedom ankle joint artificial limb with a gear mechanism. The three-degree-of-freedom ankle joint prosthesis with the gear mechanism comprises a prosthesis sleeve; the driving device assembly is arranged in the artificial limb sleeve and connected with the artificial limb sleeve; the gear movement assembly is arranged in the artificial limb sleeve, and the gear movement assembly is meshed with the driving device assembly; one end of the magnetic damping connecting device is connected with the artificial limb sleeve; the prosthetic foot is connected with the other end of the magnetic damping connecting device; wherein the driving device assembly is used for driving the gear movement assembly to move, so that the three-degree-of-freedom ankle joint artificial limb with the gear mechanism has three-active-degree-of-freedom movement; the magnetic damping connecting device provides different damping forces by changing the magnitude of current, and is used for supporting and keeping balance. Through cooperation of the driving device assembly, the gear movement assembly and the magnetic damping connecting device, three-active-freedom-degree movement can be achieved, and therefore the movement controllability and flexibility of the artificial limb system are improved.

The application discloses an ankle joint prosthesis, which comprises a tibia component, a pad and a talus component connected in sequence, and a plurality of bionic ligaments; the tibia component comprises a first intramedullary canal handle and a platform connected to the lower end of the first intramedullary canal handle; the pad comprises a pad body, and the upper surface of the pad body is provided with a cylindrical boss; the talus component comprises a second intramedullary canal handle and a connecting piece connected to the upper end of the second intramedullary canal handle; and the bionic ligaments are connected to the pad and the talus component respectively. The ankle joint prosthesis can completely replace the bone and cartilage of the ankle joint surface, thereby overcoming the problem that the cartilage surface cannot be repaired by an ankle arthroscopy surgery. The ankle joint prosthesis is used for replacing the original damaged ankle joint by using metal and polymer components, so that the discomfort symptom is relieved and the joint activity ability is reserved, and the ankle joint prosthesis is a full freedom ankle joint prosthesis which can completely reserve six activity modes of flexion, extension, inversion, eversion, internal rotation and external rotation.

The application provides an artificial prosthesis assembly for ankle replacement surgery, and belongs to the technical field of ankle prosthesis. The artificial prosthesis assembly comprises a talus arc plate, a circular arc guide rail is arranged on the top of the talus arc plate, a rivet is arranged in the interior of the talus arc plate, a joint soft plate is slidably connected to the top of the circular arc guide rail, and a tibial mounting plate is arranged above the joint soft plate; a rivet fixing assembly is arranged on the top of the tibial mounting plate. The elastic adjusting assembly and the sliding lubricating assembly are arranged, so that the contact area with the bone tissue is significantly increased, the initial stability of the prosthesis is enhanced, the risk of prosthesis separation is reduced, the prosthesis modulus is dynamically matched with the bone elasticity of the patient through the regulation of the elastic relaxation degree of the prosthesis, the risk of stress concentration of the prosthesis bone interface is reduced, the success rate of bone integration is improved, meanwhile, the prosthesis activity resistance is reduced through the ball lubrication, material fatigue and loss caused by dry friction between the prostheses are avoided, and the service life of the prosthesis is prolonged.

The invention provides a bone trabecula metal total ankle joint prosthesis, and belongs to the technical field of ankle joint prostheses. Comprising a talus connecting frame, a joint device is fixedly installed at the top of the talus connecting frame, and a tibia connecting part is fixedly installed at the top of the joint device. The joint device is characterized in that the joint device and the hinge ball can freely rotate in the hinge groove of the fixed seat, the device can adapt to the ankle joint of the human body, the rotation angle can be adjusted in a self-adaptive mode, the wear-resistant ceramic gasket is attached to the hinge ball, the friction resistance is greatly improved, and lubricating balls arranged at the outer end of the hinge ball at equal intervals provide self-lubrication; the elastic bag body is matched with the one-way valve, when the hinge ball rotates, the fixing base extrudes the elastic bag body, tissue lubricating liquid is sucked in from the outside through the piston pumping function, then the tissue lubricating liquid is evenly conveyed to the surfaces of the hinge ball and the abrasion-resistant ceramic gasket through the linear micropores, the lubricating performance is comprehensively improved, abrasion is reduced, and smooth operation of joints is guaranteed.

The invention provides a revision type total ankle joint prosthesis system, and belongs to the field of biomedical engineering. Comprising an ankle joint prosthesis body, the ankle joint prosthesis body comprises a tibia assembly, a talus assembly, a connecting embedded part located between the tibia assembly and the talus assembly and a bone fixing nail, the bone fixing nail is located on the outer walls of the sides, away from the embedded part, of the tibia assembly and the talus assembly, and a limiting assembly for preventing looseness and dislocation is arranged in the bone fixing nail; the tibia assembly comprises a tibia plate, a mounting slot is vertically formed in the side, close to the embedded part, of the tibia plate, and an inserting block connected with the mounting slot in a matched mode is arranged on the outer wall of the side, close to the tibia plate, of the embedded part. According to the ankle joint prosthesis, the tibia plate, the talus plate and the bone fixing nails can be independently installed and replaced, the bone fixing nails are connected in a clamped mode and are matched with the limiting assembly and the bevel gear to drive radial expansion, mechanical interlocking of bone tissue is enhanced, loosening is prevented, and the connection stability is ensured through the fastening design of the anti-loosening annular piece and the threads.

The invention provides an intraosseous total ankle joint prosthesis system, and belongs to the technical field of ankle joint prostheses. Comprising a tibia assembly, a backbone supporting assembly used for enhancing intramedullary stability and arranged at the top of the tibia assembly, a polyethylene liner and a clamping assembly, the polyethylene liner is fixedly connected with the tibia assembly through the clamping assembly, and the talus is chamfered and cut. The chamfering cutting talus is rotationally connected to the bottom of the polyethylene liner, the first fixing assembly and the second fixing assembly are used for improving the stability of the ankle joint prosthesis, and the first fixing assembly comprises a feeding port, a first flow channel, a filler flow channel and a second flow channel which are circularly formed in the tibia assembly at equal intervals. By means of the lightweight prosthesis design, the burden of a patient during walking and standing after an operation is relieved, pain caused by overlarge load is reduced, prosthesis abrasion is reduced, the patient is helped to actively carry out rehabilitation training, the rehabilitation process is accelerated, and the probability of a secondary operation is reduced.

According to the technical scheme, the ankle joint prosthesis comprises a tibia component, a gasket and a talus component. The tibia component is located on the outermost side and composed of a base, a supporting plate and a central screw. A hollow ball socket with sawteeth is arranged at the lower part of the base; the supporting plate is a solid hemisphere, sawteeth meshed with the sawteeth on the base are arranged on the surface of the supporting plate, angle adjustment can be achieved, and the supporting plate and the base are fixed through a central screw. The gasket is a cylinder, the upper portion of the gasket is connected with the supporting plate through a protrusion, the protrusion is provided with a recess matched with the central screw, grooves and micropores are formed in the surface of the protrusion, and the bottom of the protrusion is an arc-shaped recess used for being connected with the talus component. The gasket is further fixed to the supporting plate through the connecting rod, and stable joint connection and angle adjustment can be achieved through the overall structure.

The present application belongs to the field of foot and ankle surgical implant devices and biomedical material surface engineering technology, and discloses a tibial component of ankle prosthesis with a composite coating, which comprises: a metal substrate which is a bionic trabecular three-dimensional interconnected porous titanium alloy structure, the porosity is 50-80%, the average pore size is 400-900 mu m, and the connected porosity is greater than or equal to 85%, so that the elastic modulus is controlled in the range of 5-20 GPa, and is matched with the cancellous bone of the tibia; a composite functional coating is in situ grown on the surface of the metal substrate, and the composite functional coating comprises a bioactive layer and a functional ion doped layer. The tibial component of the present application comprises a porous titanium alloy metal substrate and a composite functional coating constructed in situ on the surface thereof, the porous titanium alloy substrate is designed in a bionic trabecular structure to form a three-dimensional interconnected porous structure, so as to provide an elastic modulus matched with the cancellous bone of the tibia and promote the growth of bone tissue.

The utility model discloses a restrictive ankle joint prosthesis, which belongs to the technical field of prostheses, and comprises a connecting column, the outer surface of the connecting column is fixedly connected with a prosthesis connecting plate, the top end of the connecting column is provided with a positioning chute, the top end of the connecting column is fixedly connected with a compression spring, and the top end of the compression spring is fixedly connected with a buffer ring. Two sets of stable sliding rods are fixedly connected to the upper surface of the prosthesis connecting plate, an intramedullary rod is arranged above the prosthesis connecting plate, and a connecting groove is formed in the bottom end of the intramedullary rod. According to the restrictive ankle joint prosthesis, through cooperation of the prosthesis connecting plate, the connecting column, the positioning sliding groove, the compression spring, the buffer ring, the positioning sliding rod, the intramedullary rod and the connecting groove, the impact force between the intramedullary rod and the connecting column is counteracted through elastic force accumulated in the compression spring, and then the limiting ankle joint prosthesis is formed through cooperation of the stabilizing sliding rod and the stabilizing sliding groove. Therefore, the torsion resistance of the prosthesis is improved, the stability of the prosthesis is improved, and the service life of the prosthesis is prolonged.

Prosthetic ankle replacements, prostheses, and associated methods of implanting prosthetic ankle and other joint replacements. In one form, a tibia stem has a geometry to facilitate implant installation while providing means to transfer load over a larger surface area through a press-fit, scratch-fit or cortical fit, thus lowering the contact stresses at the tibia-metal implant interface. The design and its implantation procedure also address minimization of misalignment. A talus element presents a partial-hemispherical surface; a tibial element which is to be affixed within the tibia, having an elongated stem part which extends into and within a canal of the tibial inner cortex, an intermediate body part which smoothly widens in radius toward an end which is a base to the tibial element, the base having a concavity formed therein shaped to match the partial-hemispherical surface of the talus element with a plastic cap between the two.

The invention relates to an ankle joint tibia prosthesis, an ankle joint prosthesis and a navigation system.The ankle joint tibia side prosthesis comprises a prosthesis body and a sliding part, the sliding part is arranged on the rear side of the prosthesis body, the position of the sliding part relative to the prosthesis body in the front-back direction of the prosthesis body is adjustable, and the sliding part is arranged on the back side of the prosthesis body. And the prosthesis main body and the sliding piece are in contact with a tibia osteotomy surface. The ankle joint tibia prosthesis can adapt to tibia anatomical structure differences of different patients, the covering effect of the ankle joint tibia prosthesis and the tibia osteotomy surface is good, the stability of the ankle joint tibia prosthesis after implantation is improved, and adverse reactions of postoperative patients are reduced.

The talus prosthesis is provided with an inner side face and an outer side face, the inner side face and the outer side face are arranged on the two sides of the median sagittal plane of the talus prosthesis respectively, and the inner side face and the outer side face are arranged in a projection orthogonal to the vertical direction of the talus prosthesis. The contour of at least one of the inner side face and the outer side face is a curve and protrudes in the direction away from the median sagittal plane. According to the talus prosthesis, the contact mode of the talus prosthesis and the inner side and the outer side of the tibia can be changed, direct rigid collision between the talus prosthesis and the tibia is avoided, the risks of abrasion, pain, inflammation and the like caused by collision between the talus prosthesis and the tibia are greatly reduced, the implanting stability of the talus prosthesis can be improved, and postoperative recovery of a patient is facilitated.

A system and method fare provided for preparing the distal tibia in an ankle replacement via an extra-medullary jig. An extra-medullary jig or C-bracket is positioned on the tibia with a registration reference and positioned with respect to a resection in the distal tibia via an anterior mounting block which is independent of the surface of the tibia. The mounting block allows the adjustment of the stem cartridge with respect to the registration reference such that the stem cartridge is properly aligned within the resection. The C-bracket is further attached to the tibia via an adjustable proximal alignment arm which attaches to a pin embedded in the proximal tibia. The C-bracket aligns the tibia, foot and ankle and the trajectory of the reamer, and is universal with respect to the left and right ankle.

The present application relates to a kind of ankle joint prosthesis and ankle joint prosthesis system, the ankle joint prosthesis includes: tibial prosthesis, sliding core prosthesis and talus prosthesis, the sliding core prosthesis is arranged between the tibial prosthesis and the talus prosthesis, the sliding core prosthesis has concave spherical surface, the talus prosthesis has convex spherical surface, the convex spherical surface and the concave spherical surface sliding fit, in the projection parallel to the sagittal plane of the ankle joint prosthesis, the midpoint of the line of the front end of the tibial prosthesis and the rear end of the tibial prosthesis is P1, in the front-rear direction of the ankle joint prosthesis, the first coronal plane F1 passing through the center of the convex spherical surface has preset interval with P1, and the P1 is located in the rear side of the first coronal plane F1.The structure of the ankle joint prosthesis of the present application is stable after implantation, stress is uniform, can slow down prosthesis wear, is beneficial to patient postoperative recovery.

This invention provides a talus component for an ankle joint prosthesis, belonging to the field of medical devices. It includes a talus, a tibia, a talus prosthesis, and a trochlear module. The surface of the talus is provided with a connecting mechanism for fixing the talus prosthesis. The interior of the limiting sleeve is provided with a fixing mechanism for fixing the trochlear module to the tibia or the human tibia. This invention, by setting a fixing mechanism, creates a limiting groove at the bottom of the tibia. The trochlear module is inserted into the limiting groove through the limiting sleeve. Tightening the threaded rod moves it forward, pushing a pusher forward, which in turn moves a wedge outward, causing the wedge to protrude from the peripheral wall of the limiting sleeve and embed itself in the tibia. This increases the pull-out resistance of the limiting sleeve. Simultaneously, one end of the rotating rod is threadedly connected to the tibia, allowing the trochlear module to be more stably fixed in the tibia through the limiting sleeve, thereby reducing the likelihood of loosening after implantation.

This invention discloses a multi-objective optimization-based method for preoperative tibial prosthesis localization in ankle replacement surgery, primarily addressing the problems of poor accuracy and low reliability in existing ankle prosthesis localization methods. The method includes: 1) acquiring and processing medical CT images and prosthesis model data of the affected lower limb, completing prosthesis standard position calibration and establishing a local coordinate system; 2) segmenting bone tissue, extracting three-dimensional models of the tibia, fibula, and talus, and including HU bone mineral density values; 3) standardizing the skeletal model, labeling anatomical landmarks, and constructing an orthogonal standard coordinate system; 4) pre-calculating relevant data of the distal tibial articular surface; 5) generating initial candidate solutions through grid search and constraint filtering; 6) obtaining the Pareto front by combining the NSGA-II-CDP algorithm and constraint dominance principles; 7) recommending the optimal solution and generating a visual model through multi-stage compromise solution filtering and multi-criteria decision-making. This invention can unify anatomical orientation, improve computational efficiency, and achieve accurate and efficient localization.

The application discloses a kind of ankle joint prosthesis, including tibial component, gasket and talus component.The tibial component is located outermost, is formed by pedestal, support plate and central screw.The upper part of pedestal is fixed handle, and the lower part is provided with hollow ball socket with sawtooth;Support plate is solid hemisphere, and the surface is provided with sawtooth with the meshing of sawtooth on the pedestal, can realize angle adjustment, and is fixed by central screw, the fixation of support plate and pedestal.Cylindrical gasket, upper part is connected with support plate by protrusion, protrusion is provided with recess matched with central screw, surface is provided with groove and micropore, bottom is circular arc recess, for connecting talus component.Gasket is also fixed with support plate by connecting rod, and the overall structure can realize stable joint connection and angle adjustment.

The application provides a revision total ankle prosthesis system, belonging to the field of biomedical engineering. The system comprises an ankle prosthesis body, which comprises a tibial component, a talus component, a connecting insert located between the tibial component and the talus component, and a bone fixation nail. The bone fixation nail is located on the outer wall of the tibial component and the talus component away from the insert. The bone fixation nail is internally provided with a anti-loosening dislocation limiting component. The tibial component comprises a tibial plate, and a mounting slot is vertically arranged on the side of the tibial plate close to the insert. An insert block matched with the mounting slot is arranged on the outer wall of the side of the insert close to the tibial plate. The ankle prosthesis can realize the separate installation and replacement of the tibial plate, the talus plate and the bone fixation nail. The bone fixation nail is connected through clamping, cooperates with the limiting component and the bevel gear to drive radial expansion, enhances the mechanical interlocking of the bone tissue, prevents loosening, and ensures the connection stability through the design of the anti-loosening ring and the threaded fastening.