15 results about "Knee arthrodesis prosthesis" patented technology

The application discloses a mechanical locking type tibial platform, a tibial prosthesis and a knee joint prosthesis. The mechanical locking type tibial platform comprises a platform holder used for being attached to the proximal end of a tibia, a middle column extending downward along the center of the platform holder and used for being inserted into the marrow cavity of the tibia, an axial hole being arranged in the center of the middle column, a sleeve arranged in the axial hole of the middle column, a limiting structure being arranged on the outer wall of the sleeve, the limiting structure being configured to cooperate with the middle column to enable the sleeve to slide only in the axial direction of the axial hole, a fastener connected to the sleeve and protruding from the outer side wall of the middle column and used for being inserted into the cortical bone of the tibia, and a stand column, one end of the stand column being provided with a limiting block used for abutting against the top surface of the platform holder, and the other end of the stand column being provided with a threaded segment which is threadedly connected to the inner wall of the sleeve. The cooperation of the stand column, the sleeve and the fastener can lock the platform holder to the proximal end of the tibia and ensure the initial stability of the tibial platform.

This invention provides a fixation device and assembly method for pericondylar fractures of the knee joint prosthesis. The knee joint prosthesis includes a femoral condyle, a tibial plateau, and a tibial pad. The femoral condyle includes an anterior condyle, two posterior condyles, and an intercondylar fossa. A fixation device is installed in the intercondylar fossa, comprising an intramedullary fixation pin and a connecting fixation block. The connecting fixation block is installed within the intercondylar fossa and engages with the force-applying end of the intramedullary fixation pin. The connecting fixation block includes a main body with a top surface facing the tibial pad and a bottom surface opposite the top surface. The bottom surface extends away from the top surface to form a protrusion, and a through hole is formed within the protrusion, which is used to accommodate and fix the force-applying end of the intramedullary fixation pin. This invention embeds the entire connecting fixation block within the intercondylar fossa, fully utilizing the existing intercondylar fossa space of the PS-type prosthesis to establish a precise channel for the intramedullary fixation pin, thereby fixing the pericondylar fracture through structural fit.

The invention provides an individualized tibia defect repairing type knee joint prosthesis, and belongs to the technical field of orthopedic implants. The device is formed by assembling a femoral condyle, a femoral bone marrow needle, a plateau pad, a tibia plateau, a restoration body and a tibia bone marrow needle. Wherein the tibia platform and the restoration body are matched through metal-metal threads and are assisted by bone cement to achieve anti-rotation locking, the restoration body adopts a 3D printing individualized bone trabecula structure and is compounded with an HA coating to promote bone ingrowth, the tibia bone marrow needle and the platform are connected through a standard taper connector, inventory and individualization compatibility is achieved, and the bone marrow needle and the platform are connected through a standard taper connector. The defects that an existing prosthesis is large in bone mass loss, unattractive in reconstruction, free of bone ingrowth function, high in processing cost and the like are overcome, and the postoperative function of a tibia defect patient and the long-term stability of the prosthesis can be remarkably improved.

The utility model relates to the field of knee joint prostheses, in particular to a knee joint prosthesis with a reinforcing structure, which comprises a tibia support, a prosthesis body and a first fixing rod, a second fixing rod is arranged at the bottom of the tibia support, a mounting seat is embedded in the middle of the prosthesis body, and the bottom of the first fixing rod is fixedly connected with the top of the mounting seat. The tibia support and the prosthesis body are in implantation connection with knee joint bones of a patient through a second fixing rod and a first fixing rod respectively, the tibia support and the prosthesis body are rotationally connected through a first connecting piece and a second connecting piece, and a rubber column is fixedly installed at the bottom of the cylinder, installed in the sleeve in a clamped mode and capable of moving up and down in the sleeve. The knee joint of a patient can be bent conveniently, flexibility is higher, the tibia support and the prosthesis body are tightly connected and attached to each other through the first connecting piece and the second connecting piece, and loosening and falling are prevented.

The application discloses a shaft core type knee joint prosthesis and belongs to the technical field of artificial prosthesis. The knee joint prosthesis comprises a femoral condyle prosthesis and a tibial plateau support, and further comprises a tee joint structure. The top end of the femoral condyle prosthesis is connected with a bone cutting segment through taper cooperation, and the joint end of the femoral condyle prosthesis is provided with a transversely penetrating shaft hole. The top center of the tibial plateau support is fixed with a counterbore. One end of the tee joint structure is located in the counterbore. The other two opposite ends of the tee joint structure are located in the shaft hole of the femoral condyle prosthesis. The top of the tibial plateau support is provided with a tibial plateau pad corresponding to the joint end surface of the femoral condyle prosthesis. The joint end surface of the femoral condyle prosthesis is located on the upper surface of the tibial plateau pad. The adaptability and stability of the knee joint prosthesis are significantly increased.

The invention discloses a construction method and application of a calculation model of varus knee joint contact stress, and the method comprises the steps: setting a femur and femur cartilage of a knee joint as first elastomers, setting a tibia and tibia cartilage as second elastomers, respectively setting a high-elasticity-modulus layer and a low-elasticity-modulus layer, applying a normal force to the high-elasticity-modulus layer and introducing a modification coefficient, obtaining the corrected contact radius and peak pressure, and constructing a dynamic equilibrium equation of the introversion knee joint; adding meniscus parameters, and constructing a peak contact stress model of double contact areas of the introversion knee joint; constructing a strain function for the low-elastic-modulus layer by adopting a Yeoh model to obtain the elastic modulus of the meniscus material during large strain; inputting the image data, the introversion angle and the load parameters of the subject into the mathematical model of the peak contact stress of the knee joint, comparing the obtained analytical solution with the numerical solution of the finite element model, and if the analytical solution is within a preset range, proving that the mathematical model is correct, and applying the mathematical model to the optimization application of the artificial meniscus and the knee joint prosthesis.

The application provides a knee joint replacement surgery planning method and device based on X-ray images, equipment and a storage medium. The method comprises the following steps: acquiring two orthogonal X-ray images of a knee joint; using a statistical shape model method to three-dimensionally reconstruct a three-dimensional model of a femur and a tibia of the knee joint from the two input X-ray images, and outputting key point positions; recommending a prosthesis model and a pose according to the three-dimensionally reconstructed model and the key point positions; confirming the inspection result by a doctor by using the spatial relationship constructed by the key points, and further adjusting the prosthesis pose according to needs, and finally outputting a knee joint prosthesis replacement surgery planning scheme. The method disclosed by the application uses the statistical shape model method to three-dimensionally reconstruct a two-dimensional X-ray image into a three-dimensional bone model and visualize the three-dimensional bone model, which is beneficial to the doctor to more intuitively observe the prosthesis positioning condition, so that the surgery scheme can be better outputted. Moreover, the method disclosed by the application has a relatively low cost and can cover more people.

A knee joint prosthesis includes a femoral component and a tibial component. The femoral component includes a medial condylar articulation surface, a lateral condylar articulation surface and a central box therebetween, the central box being enclosed on a bone-facing side of the femoral component and open on a tibial-facing side of the femoral component. The tibial component including a medial tibial articulation surface, a lateral tibial articulation surface and a post therebetween, the post being disposed within the central box of the femoral component. A concave curved surface portion of the box travels along a convex curved surface portion of the post over a range of motion of the tibial component relative to the femoral component such that an axis of rotation of the box of the femoral component and the post of the tibial component is coincident over the range of motion.

The application provides a knee joint prosthesis periprosthetic fracture fixation device and an assembling method. The knee joint prosthesis comprises femoral condyles, a tibial plateau and a tibial pad. The femoral condyles comprise an anterior condyle, two posterior condyles and an intercondylar fossa. The fixation device is installed at the intercondylar fossa. The fixation device comprises an intramedullary fixation needle and a connecting fixation block. The connecting fixation block is installed in the intercondylar fossa. The connecting fixation block is connected with the force applying end of the intramedullary fixation needle. The connecting fixation block comprises a main body. The main body has a top surface facing the tibial pad and a bottom surface opposite to the top surface. The bottom surface extends in a direction away from the top surface to form a protruding part. A through hole penetrating through the main body is formed in the protruding part. The through hole is used for accommodating and fixing the force applying end of the intramedullary fixation needle. The whole connecting fixation block is embeddedly installed in the intercondylar fossa. The original intercondylar fossa space of the PS type prosthesis is fully utilized to establish a precise channel of the intramedullary fixation needle. The periprosthetic fracture is fixed through structural cooperation.

The invention discloses a continuous drug delivery device used in an infected articular cavity around a knee joint prosthesis, and belongs to the field of medical instruments, the same as the prior art, the continuous drug delivery device comprises an infusion tube, the infusion tube comprises a connecting section and a liquid delivery section, the liquid delivery section is located in the articular cavity, a plurality of holes are evenly formed in the tube wall of the liquid delivery section, and the holes are distributed in a spiral shape. Compared with the prior art, the infusion tube is formed by combining a plurality of pipelines which are detachably connected together, an injector connector and a liquid pumping device connector are arranged at the tail end of a connecting section, a balloon tube is arranged on one side close to the connectors, one end of the balloon tube is communicated with a balloon, and the other end of the balloon tube extends out of the body. According to the continuous drug delivery device, accurate delivery of liquid medicine and safety and reliability of the treatment process are guaranteed from different angles, the cure rate of infection around the knee joint prosthesis is increased, the treatment and rehabilitation cycle of a patient is shortened, and prognosis of the patient is improved.

The invention relates to a spacer mould used in the field of health, particularly in orthopaedics and traumatology, during the treatment of infections around knee prostheses. The invention particularly relates to a modular spacer mould for the femur, having detachable moulds that allow the length to be adjusted by means of a toothed structure and that enable the antibiotic cement to be shaped in the desired size.

The present application relates to a kind of knee joint prosthesis and its manufacturing method, wherein the knee joint prosthesis includes tibial platform prosthesis, tibial platform prosthesis has osteotomy fitting area;Osteotomy fitting area includes integration area, anchoring area and transition zone;Integration area is positionally corresponding with host cancellous bone area, for inducing bone tissue growth to realize long-term biological fixation;Anchoring area is positionally corresponding with host sclerotic bone area or cortical bone area, realizes immediate fixation by mechanical interlocking;Transition zone is located between integration area and anchoring area, and the porosity of transition zone gradually decreases along the direction of integration area to anchoring area, and structural rigidity gradually increases along the direction of integration area to anchoring area, its beneficial effect is, the active adaptation of prosthesis and host bone bed non-uniform biological characteristics is realized, immediate mechanical stability and long-term biological integration effect are obtained under the premise of not needing permanent screw auxiliary fixation, the risk of prosthesis loosening is reduced, and the clinical service life of prosthesis is effectively prolonged.

The invention provides a knee joint prosthesis test mold device, which comprises a femoral condyle prosthesis test mold, an intercondylar fossa arranged on the outer surface of the femoral condyle prosthesis test mold; the laser transmitter is arranged in the intercondylar fossa; the tibia test mold assembly comprises a tibia platform prosthesis test mold and a tibia spacer test mold, the tibia spacer test mold is arranged on the surface, facing the femoral condyle prosthesis test mold, of the tibia platform prosthesis test mold, and the laser emitting end of the laser emitter faces the tibia spacer test mold; wherein the femoral condyle prosthesis test mold and the tibia test mold assembly have a relative rotation state and a relative static state, and when the femoral condyle prosthesis test mold and the tibia test mold assembly are in the relative rotation state, the femoral condyle prosthesis test mold can drive the laser transmitter to rotate relative to the tibia test mold assembly. According to the technical scheme, the problem that in the prior art, when total knee arthroplasty is carried out, the precision of the tibial prosthesis function rotation axis is poor is effectively solved.

The invention relates to the technical field of medical equipment, and discloses a static position occupying device for knee joint periprosthetic infection treatment, which comprises a thighbone position occupying component, a tibia position occupying component and a connecting component, a first articular surface is arranged on one side of the femur occupying component away from the femur; a second articular surface is arranged on the side, close to the proximal tibia end, of the tibia occupying assembly, and the second articular surface is movably connected with the first articular surface through a clamping part; the connecting assembly is arranged between the thighbone occupying assembly and the tibia occupying assembly, and the two ends of the connecting assembly are detachably connected with the thighbone occupying assembly and the tibia occupying assembly correspondingly, so that relative fixation and position adjustment between the thighbone occupying assembly and the tibia occupying assembly are achieved; medicine storage cavities are formed in the femur occupying assembly and the tibia occupying assembly. The spacer can be accurately matched with individual anatomy, and joint stability and tissue safety are guaranteed.

The invention provides a readable storage medium and an orthopedic robot system, a program is stored on the readable storage medium, and when the program is executed, the following steps are realized: setting feature reference points on a preoperative medical image or a three-dimensional model of a target femur based on public parameters of a femoral prosthesis so as to determine osteotomy references of a distal end surface and a posterior condylar surface; osteotomy of the far end face and the posterior condyle face is executed on the target femur, and a far end osteotomy face and a posterior condyle osteotomy face are formed; based on the posterior condyle osteotomy surface, a positioning and guiding device is installed, and the positioning and guiding device is made to be attached to the posterior condyle osteotomy surface; an osteotomy plate is installed on the positioning and guiding device in a matched mode, and the osteotomy plate is made to abut against the far-end osteotomy face; based on the guidance of the osteotomy plate, osteotomy of the anterior condyle face, the anterior inclined face and the posterior inclined face is completed. By means of the configuration, the method is not limited by complete geometric parameters of the knee joint prosthesis authorized by a prosthesis product company, open type knee joint prosthesis interchange selection can be achieved, and the method is not limited by using prosthesis products of specific brands.