43 results about "Ankle joint prosthesis" patented technology

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.

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 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 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 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.

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.

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.

The present application provides a kind of ankle joint prosthesis, comprising: tibial prosthesis;Talus prosthesis, with tibial prosthesis sliding fit, talus prosthesis includes talus body and buffer pad, buffer pad is in contact with tibial prosthesis, talus body is provided with multiple hole parts to the side of tibial prosthesis, multiple hole parts are arranged in array, buffer pad includes pad body and multiple plug-in parts, multiple plug-in parts and pad body are connected, multiple plug-in parts and multiple hole parts are set up one by one, plug-in part is inserted into corresponding hole part, pad body and multiple plug-in parts are configured to be able to produce elastic deformation under pressure state.The technical scheme of the present application effectively solves the problem that the ankle joint prosthesis in the related art is difficult to realize the mechanical environment of physiological state.

A position adjustment device having a tool holder is locked to at least two pins projecting from respective anterior facing locations near a distal end of a tibia of a patient. The position adjustment device is adjusted. The position adjustment device is locked with the tool holder at first coordinates in the proximal-distal and medial-lateral directions. The distal end of the tibia is resectioned with a tool positioned on the tool holder, while the tool holder is in the first coordinates in the proximal-distal and medial-lateral directions. The tool is removed from the tool holder. A tibia trial is placed on the resectioned tibia using the tool holder, while the tool holder is in the first coordinates in the proximal-distal and medial-lateral directions. The tibia trial has a size and shape of a tibial tray of an ankle replacement system.

This invention provides a navigation device for clinical ankle joint prosthesis surgery, belonging to the field of medical devices. It includes a navigation device with a sliding rod slidably connected to its inner side. Kirschner screws are disposed at both ends of the navigation device, and the outer walls of the Kirschner screws are fixedly connected to fixing seats via bolt assemblies. An arc-shaped block is installed at the end of the sliding rod, and a rectangular frame is disposed above the arc-shaped block. A fixing block is fixedly connected to one end of the rectangular frame, and one of the Kirschner screws is fixedly connected to the inner side of the fixing block via bolt assemblies. The fixing block is positioned above one of the fixing seats. A rotating block is rotatably connected to the other end of the navigation device, and the rotating block is connected to another Kirschner screw via bolt assemblies. The rotating block is positioned above another fixing seat. This invention, through the cooperation of the fixing mechanism and other components, enables the navigation device to perform rapid calibration and reset, shortening surgical preparation time and improving overall surgical efficiency.

Provided are tibia stem components of ankle replacement prosthesis that are designed to engage dense tibia bone to reduce implant migration over long term.

A computer-implemented method comprises, in response to receiving an indication of user input to change a total ankle replacement (TAR) prosthesis system, determining a position and orientation of a tibial prosthesis model relative to a tibial bone model, the tibial prosthesis model being a 3-dimensional virtual model of the tibial prosthesis; determining a position of a talar prosthesis model relative to a talar bone model, the second talar prosthesis model being a 3-dimensional virtual model of the second talar prosthesis; and outputting, for display at a display device, the second tibial prosthesis model at the determined position and orientation of the second tibial prosthesis model relative to the tibial bone model and the second talar prosthesis model at the determined position and orientation of the second talar prosthesis model relative to the talar bone model.

The invention provides a clinical ankle joint prosthesis operation navigator, and belongs to the field of medical instruments. Comprising a navigator, a sliding rod is slidably connected to the inner side of the navigator, Kirschner wires are arranged at the two ends of the navigator, fixing bases are fixedly connected to the outer walls of the Kirschner wires through bolt assemblies, an arc-shaped block is installed at the end of the sliding rod, and a rectangular frame is arranged above the arc-shaped block; one end of the rectangular frame is fixedly connected with a fixing block, the inner side of the fixing block is fixedly connected with one Kirschner wire through a bolt assembly, the fixing block is arranged above one fixing base, and the other end of the navigator is rotationally connected with a rotating block; the rotating block is connected with the other Kirschner wire through a bolt assembly, and the rotating block is arranged above the other fixing seat. Through cooperation of the fixing mechanism and other parts, the navigator can be rapidly calibrated and reset, the operation preparation time is shortened, and the overall operation efficiency is improved.

This invention provides a parallel air column ankle prosthesis to address the problems of existing prostheses having a fixed support direction, being prone to rollover on uneven ground, and being difficult to adjust according to different gait states. It includes: a foot structure, air column assemblies, a cross-airflow assembly, and an air supply assembly; the air column assembly has at least eight groups, arranged in a circumferential array around a central support assembly; the cross-airflow assembly is configured such that when pressure is applied to the medial or lateral side of the foot, the gas in the bladder of the air column assembly on the pressure side is forced into the bladder of the air column assembly on the unpressured side, increasing the gas pressure in the bladder on the unpressured side to create a counter-supporting force against foot rollover; the air supply assembly is suitable for initially pre-filling the bladder of each air column assembly with gas to support the ankle seat, and for providing gas to different bladders when the foot is in different gait states. This prosthesis can adjust gait in real time and adapt to complex terrain to prevent rollover.

The utility model discloses an anatomical arc-shaped ankle joint prosthesis, which belongs to the technical field of joint prostheses and comprises a first prosthesis plate, and a first coating plate is arranged on the bottom surface of the first prosthesis plate. A fixing plate is arranged on the top face of the first prosthesis plate, a second prosthesis plate is arranged on the top face of the fixing plate, and a second coating plate is arranged on the top of the second prosthesis plate. According to the arc-shaped ankle joint prosthesis, through the arrangement of the first five-star column and the second five-star column, compared with a traditional arc-shaped ankle joint prosthesis, the installation directions of the first five-star column and the second five-star column are changed through the design, so that the arc-shaped ankle joint prosthesis can be installed from a front approach, the situation that a fibula needs to be broken in a traditional operation is avoided, and operation wounds are reduced; postoperative rehabilitation is promoted, the front-back width of the ankle joint prosthesis is changed, the ankle joint prosthesis better conforms to physiological anatomy of a human body, the contact area of a bone and the prosthesis is increased, pressure borne by the surface of the prosthesis is dispersed, and prosthesis collapse caused by strength concentration is reduced.

The invention provides an ankle joint replacement joint fixing device based on 3D printing, and belongs to the technical field of medical instruments. The device comprises a bottom plate, an adjusting assembly, a foot fixing groove and a tibia fixing assembly, and a core structural part is integrally formed through 3D printing; during use, the foot is placed in the foot groove, the tibia is placed between the tibia fixing blocks, then the adjusting assembly drives the sliding block to move, the angle of the foot fixing groove is adjusted between-30 degrees and 52 degrees, then the first fixing piece is used for fixing the foot dorsum to prevent horizontal displacement, the second fixing piece and the third fixing piece are used for limiting the inner and outer ankles to prevent transverse displacement, and finally the rotating wheel is rotated to drive the lead screw. And the tibia is clamped and locked by the tibia fixing assembly within the range of 0-86mm. The problems that a traditional device is single in angle, unstable in fixation and long in manufacturing period are solved, the adaptability and operation accuracy of the device are improved, meanwhile, the production cost is reduced, and the production period is shortened.

The tibia prosthesis is used for being installed at the far end of a tibia, the tibia prosthesis is provided with a first inner side face and a first outer side face, and the first inner side face and the first outer side face are arranged on the two sides of the median sagittal plane of the tibia prosthesis respectively. In a projection orthogonal to the vertical direction of the tibia prosthesis, the outlines of the first inner side face and the first outer side face are both curves and protrude in the direction away from the median sagittal plane. The tibia prosthesis is reasonable in structural design, the tibia prosthesis can be highly matched with the anatomical structure of the human body, the osteotomy amount is reduced, the risk that the prosthesis collides with the tibia in the moving process is reduced, the problem of pain of a patient is solved, the service life of the prosthesis is prolonged, and the cost is reduced. The success rate of the ankle joint replacement operation and the postoperative life quality of a patient are obviously improved.

The present disclosure discloses an ankle prosthesis containing zirconium-niobium alloy on oxidation layer and a preparation method thereof, the preparation method comprises: using zirconium-niobium alloy powder as a raw material, conducting a 3D printing for one-piece molding to obtain an intermediate products of the talus part and tibial part, and performing Sinter-HIP, cryogenic cooling and surface oxidation to obtain talus part and tibial part. The talus part is connected with the tibial part in a sliding mode; a bone trabeculae is respectively arranged on the lower surface of the talus body and the outer surfaces of the two first fixations, and on the upper surface of the tibial body and the outer surfaces of the two second fixations as well, so as to improve bone ingrowth.

Instruments, guides, systems and related methods for total ankle prostheses are disclosed. The instruments, guides, systems and related methods facilitate preparation of a tibia and / or talus of a patient for implantation of a total ankle prosthesis therein. The instruments, guides, systems and related methods also facilitate selection of a particular size of a tibial component, a talus component and / or a tibial insert of the total ankle prosthesis that suits the patient. The instruments, guides, systems and related methods include a tibial trial component, a talar trial component and tibial insert trial component that replicate one or more aspects of the tibial component, the talus component and the tibial insert, respectively, of the total ankle prosthesis. The talar trial component includes an articulation surface that articulates with the tibial insert trial component, and slots that facilitate chamfered resection of the patient's talus for the implantation of the talus component thereon.

- Improved ankle prosthesis. - The invention relates to an ankle prosthesis (100), comprising a tibial component (300) intended to be attached to the lower end of a patient's tibia, a talar component (200) intended to be attached to the talus of the patient's foot and having a superior talar face (201) defining a first articular surface (202), and an intermediate component (400) designed to be interposed between the talar component (200) and the tibial component (300), said intermediate component (400) comprising an intermediate inferior face defining a second articular surface designed to cooperate with said first articular surface (202). - Ankle prostheses. - Figure 1.