42 results about "Ankle prosthesis" patented technology

The application discloses an electro-hydraulic active ankle prosthesis and a walking method, relates to the technical field of prostheses and additive manufacturing technology, and discloses an electro-hydraulic active ankle prosthesis, which comprises a motor pump, a hydraulic cylinder, a hydraulic integrated block, an accumulator group and an integrated topology instep, wherein the motor pump, the hydraulic cylinder, the accumulator group and the integrated topology instep are all integrated on the hydraulic integrated block, the motor pump is used for charging the accumulator group, the motor pump and the accumulator group are both used for being connected with the hydraulic cylinder, and the hydraulic cylinder is used for being connected with the integrated topology instep. The electro-hydraulic active ankle prosthesis and the walking method have the advantages that the motor pump, the hydraulic cylinder, the accumulator group and the integrated topology instep are all integrated on the hydraulic integrated block, so that the overall volume and weight are reduced.

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 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 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 present application relates to a kind of power ankle prosthesis based on adjustable position one-way parallel spring, mainly by support mechanism, power direct drive mechanism, spring mechanism, adjusting mechanism, toe mechanism composition.Support mechanism is connected with human lower extremity stump, power direct drive mechanism, spring mechanism, adjusting mechanism are fixed on support mechanism, and toe mechanism is hinged with support mechanism.The support mechanism of the present application provides the support of ankle prosthesis, power direct drive mechanism and spring mechanism provide the energy output and support torque required in the walking process of power ankle prosthesis, spring mechanism stores passive energy and releases, compensates motor energy consumption, adjusting mechanism realizes the adaptive adjustment to wearer gait speed in the walking process, and elastic toe mechanism simulates the elastic mechanism of normal human toe in the walking process, provides passive elastic grip for ankle.

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 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.

This application discloses an ankle prosthesis, which includes a heel, an ankle joint, a soleplate, a shock absorber, a connecting rod, a lever, and a torsion spring; the connecting rod, the lever, and the torsion spring are all arranged in front of the shock absorber, the shock absorber is arranged on the upper surface of the ankle joint, one end of the connecting rod is connected to the top of the shock absorber, and the other end is connected to the proximal end of the lever; the distal end of the lever is connected to one spring leg of the torsion spring, and the other spring leg of the torsion spring is fixedly connected to the soleplate; through the cooperation of the shock absorber, the cam, the push rod, the lever, and the torsion spring, this application realizes the storage and release of energy during the movement of the prosthesis, does not require an external power source, and improves the convenience and autonomy of use.

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.

A semi-powered foot and ankle prosthesis (100) has a foot member (128) coupled to the ankle frame (112) and movable with respect to the ankle frame (112). A linear actuator (144) is coupled to and between the ankle frame (112) and the foot member (128) to move the foot member (128) with respect to the ankle frame (112). The linear actuator (144) has a drive motor (150). A locking mechanism (104) selectively engages the drive motor (150) to selectively lock movement of the drive motor (150) to resist a force on the foot member (128) from backdriving the linear actuator (144).

This application discloses a control method and system for an electrohydraulic active ankle prosthesis, relating to the fields of lower limb gait recognition and prosthesis control. The method includes: extracting plantar pressure features based on plantar pressure signals; obtaining the division results of four gait stages—passive plantar flexion, passive dorsiflexion, active plantar flexion, and active dorsiflexion—based on the plantar pressure features and a trained SVM model; deriving the real-time gait stages based on the division results of the four gait stages, combined with the state division of a finite state machine based on ankle angle signals and plantar switches, through a weighted decision model; generating control signals for prosthesis movement based on the real-time gait stages and fluid pressure signals; and controlling the movement of the electrohydraulic active ankle prosthesis based on the control signals. This application can accurately identify lower limb gait, thereby achieving accurate control of the prosthesis based on the lower limb gait.

The application discloses a variable stiffness ankle prosthesis, which comprises a foot plate and a lower leg frame connected in rotation, a first elastic member on the foot plate, a movable plate connected to the foot plate in sliding, one end of the first elastic member being fixed relative to the foot plate and the other end being connected to the movable plate, and a variable stiffness mechanism for adjusting the position of the movable plate. The variable stiffness ankle prosthesis is provided to solve the problem that passive prosthesis is difficult to fully simulate the function of human ankle joint in the prior art, and to achieve the purpose that the ankle prosthesis can change stiffness under different gait cycles.

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.

An instrument system for preparing a tibia of a patient to receive a tibial component of an ankle prosthesis is provided. The instrument system may include a preparation or alignment assembly, a reamer assembly, a guide wire insertion assembly, and a flexible drill assembly. Each of the aforementioned assemblies may be operatively coupled to the tibia of the patient, directly or indirectly, to ensure proper alignment of the instrumentation for formation of a cavity about a central axis of the tibia along the coronal plane thereof.

Technology is described to provide a foot / ankle prosthesis for individuals with transfemoral limb loss. This technology is able to store and release energy and thus individuals or patients who are using the foot / ankle prosthesis are able to expend less energy when walking or running. The device or system can include a prosthetic foot / ankle system with a linear or rotary hydraulic damper such that the hydraulic damper is attached to dynamic energy storing spring elements. The axis of rotation of the system can be near to that of an intact human ankle. The system can utilize spring elements based on the vertical displacement of the center of pressure of an intact normal foot. The system can also provide user adjustable heel height.

The application discloses a three-degree-of-freedom ankle prosthesis with a gear mechanism. The three-degree-of-freedom ankle prosthesis with the gear mechanism comprises a prosthesis sleeve, a driving device assembly arranged in and connected with the prosthesis sleeve, a gear motion assembly arranged in the prosthesis sleeve and engaged with the driving device assembly, and a magnetic damping connecting device with one end connected with the prosthesis sleeve. A prosthesis foot is connected with the other end of the magnetic damping connecting device. The driving device assembly is used for driving the gear motion assembly to move, so that the three-degree-of-freedom ankle prosthesis with the gear mechanism has three active degrees of freedom. The magnetic damping connecting device provides different damping forces by changing the current size, and is used for supporting and keeping balance. Through cooperation of the driving device assembly, the gear motion assembly and the magnetic damping connecting device, the three active degrees of freedom can be realized, so that the motion controllability and compliance of the prosthesis system are improved.

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.

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.

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 semi-powered foot and ankle prosthesis (100) has a foot member (128) coupled to the ankle frame (112) and movable with respect to the ankle frame (112). A linear actuator (144) is coupled to and between the ankle frame (112) and the foot member (128) to move the foot member (128) with respect to the ankle frame (112). The linear actuator (144) has a drive motor (150). A locking mechanism (104) selectively engages the drive motor (150) to selectively lock movement of the drive motor (150) to resist a force on the foot member (128) from backdriving the linear actuator (144).

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.

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.

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.