15 results about "Ankle prosthesis" patented technology

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 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 application discloses a hydraulic integrated block, an electro-hydraulic ankle prosthesis and a design method thereof, and belongs to the technical field of prostheses and additive manufacturing. When the hydraulic integrated block is in passive plantar flexion and passive dorsiflexion, the oil output by a motor pump directly charges a motor energy storage accumulator, when passive dorsiflexion, a hydraulic cylinder directly charges a gravity recovery accumulator, and when active plantar flexion, the total output of the hydraulic system is the sum of the outputs of the motor pump, the gravity recovery accumulator and the motor energy storage accumulator, realizing the storage, recovery and overall regulation and control of the energy of the prosthesis. The electro-hydraulic ankle prosthesis is designed with spatial arrangement of elements and adopts a B-spline curve guide line flow channel to complete the connection of curved pipelines between elements, thereby reducing the overall space volume of the prosthesis, and the overall weight is effectively reduced through filling of a multi-scale porous structure in an internal non-solid area. The design method optimizes the overall element integration, weight and pressure loss of the prosthesis, guarantees the integration and light weight of the prosthesis, and improves the energy utilization efficiency.

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.

A kind of bionic intelligent foot ankle prosthesis based on complex conjugate surface rolling, including foot sole structure, talus structure is connected on foot sole structure, talus structure is connected with talus rolling joint;Talus structure is connected with ball screw sliding block through achilles tendon structure, ball screw nut is connected on ball screw sliding block, ball screw is installed between screw base and motor screw fixed block, screw base, motor screw fixed block are fixed on tibia structure;Tibia structure bottom is connected with tibia rolling joint, tibia rolling joint is connected with talus rolling joint and rolls, is constrained by parallel spring, both ends of parallel spring are connected on tibia structure and talus structure;Ball screw is driven by motor, motor is fixed on tibia structure;The present application can accurately fit the motion characteristics of human ankle joint, effectively promote lower limb movement mode of foot ankle amputee, so that prosthesis gait is more smooth and natural, with wide application prospect.

A system for preparing an ankle bone to receive an ankle prosthesis is provided. The system includes a patient specific cutting guide that has an anterior surface, a posterior surface, and at least one cutting feature extending through the guide from the anterior surface. The posterior surface comprising a first protrusion or other member that extends from a first end fixed to the posterior surface to a second end disposed away from the first end of the first protrusion. The posterior surface has a second protrusion or other member that extends from a first end fixed to the posterior surface to a second end disposed away from the first end of the second protrusion. The first and second protrusions are spaced apart and have a length such that when the patient specific cutting guide is coupled with first and second bone references, which can include bushings implantable in bones, a clearance gap is provided between the posterior surface and the ankle bone.

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.

This invention belongs to the field of medical device technology, and specifically relates to an axially damping knee and ankle prosthesis, including a knee joint and an ankle joint, and a leg sleeve and footplate respectively installed on the knee and ankle joints. A guide post is fixedly connected to the lower side of the knee joint, and a support cylinder is slidably connected to the guide post. A piston seat, slidably connected to the support cylinder, is fixedly connected to the lower end of the guide post. An axial damping component is provided between the piston seat and the support cylinder. This invention, through the cooperation of the axial damping component and the rebound suppression component, can buffer and dampen the axial impact force generated during walking. Furthermore, through the provision of a horizontal torsional buffer component, it can buffer the horizontal torque generated during walking. Additionally, through the cooperation of a heat dissipation component and an energy storage control component, it can automatically collect air for cooling and intermittently spray air into the leg sleeve for active heat dissipation as the prosthesis walks, thereby improving the heat dissipation effect of the leg sleeve.

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 utility model discloses a kind of half foot artificial limbs, including foot support, the foot sole containment sleeve fixed in the front part of foot support, the surrounding plate connected with the upper end of foot support by two connecting strips, the fixing strip for fixing the surrounding plate on leg in the circumferential side of surrounding plate;The one end of connecting strip is rotatably connected with the upper end of foot support, and the other end is fixedly connected with surrounding plate.The utility model has the advantages that: the half foot artificial limb of the application is good for wrapping half foot stump, and it is convenient to fix half foot stump;Ankle joint can be moved, so that walking is convenient, and comfort is high.

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.

The ankle prosthesis of the present disclosure includes a load directing mechanism that alters the internal load path during weight bearing, guiding the load directly into the structural frame. By changing the load path with the load directing mechanism, both vertical and horizontal loads can be supported directly by the ankle's structure through a cam roller.

An intelligent foot and ankle prosthesis based on human structure and motion simulation, including a heel profiling structure, the heel profiling structure is connected with a talus profiling structure, the talus profiling structure is connected with a foot sole profiling structure, the heel profiling structure and the foot sole profiling structure are installed with compression springs at the ends; the talus profiling structure is connected with one end of an Achilles tendon profiling structure, the other end of the Achilles tendon profiling structure is connected with a ball screw sliding block, the ball screw sliding block is fixed with a ball screw nut, the ball screw is fixed on a tibia profiling structure through screw bases and screw top fixing blocks at both ends, the tibia profiling structure is fixed with a prosthesis receiving cavity connecting block at the top end; the ball screw is driven by a motor, the tibia profiling structure and the talus profiling structure constitute a rolling joint connected by a fixed spring; the present application has the characteristics of simple and compact structure, good human motion fitting characteristics, excellent motion effect, energy saving, etc., and can be widely applied.