3 results about "Intervertebral disk prostheses" patented technology

The present application relates to the technical field of orthopedic artificial joint design and manufacturing, in particular to an intervertebral disc prosthesis and a preparation method thereof. The first plate body of the intervertebral disc prosthesis is provided with a semispherical groove on the side away from the first fixing seat; the second plate body is provided with a connecting slot on the side away from the second fixing seat; the nucleus pulposus prosthesis comprises a semispherical convex surface and a base, the semispherical convex surface is movably connected with the semispherical groove, and the base is connected with the connecting slot; the surfaces of the first plate body and the second plate body are both provided with gradient trabeculae, and the surfaces of the semispherical groove and the semispherical convex surface in contact with each other are both metal ceramic interfaces formed by zirconium-niobium surface oxidation. The upper end plate of the intervertebral disc prosthesis can keep relative movement with the nucleus pulposus prosthesis, and the contact friction interface of the relative movement is a metal ceramic interface formed by zirconium-niobium surface oxidation, so that the friction surface can reduce abrasion to the greatest extent, the wear resistance of the prosthesis is improved, the service life of the prosthesis is prolonged, the loosening of the prosthesis is improved, the metal allergic reaction and metal artifacts are reduced.

Intervertebral disk prosthesis comprising an external waterproof multilayered deformable casing surrounding a peripheral partition membrane delimiting an outer space and an inner cavity, wherein the inner cavity is partitioned by vertical walls delimiting at least four cavity compartments configured to be filled with a non-toxic saline solution, and wherein the vertical walls comprise orifices and / or porous membranes configured to induce the saline solution to flow from one cavity compartment toward another upon heterogeneous application of a pressure comprised between 0.05 and 3 MPa in a duration comprised between 10 seconds and 60 minutes, and to revert back to its native compartment upon removal of said pressure in a duration comprised between 10 seconds and 180 minutes, and wherein the walls are distributed asymmetrically in the inner cavity so that a posterior part of the inner cavity comprises fewer and / or larger cavity compartments than an anterior part of the inner cavity.

This invention discloses a method for designing and fabricating a personalized artificial intervertebral disc prosthesis, belonging to the field of artificial intervertebral disc prosthesis technology. The invention aims to solve the problems of poor mechanical adaptability, lack of biomimetic structure, and design-manufacturing disconnect in existing prostheses. The steps include: S1, collecting kinematic and dynamic data of the lumbar spine under healthy conditions to obtain the torque-rotation curve of the target vertebral segment; S2, establishing and validating a finite element model based on MRI / CT, ​​with motion deviation within 5%; S3, constructing a biomimetic intervertebral disc including a biomimetic nucleus pulposus, transition zone, annulus fibrosus, and endplate, wherein the number, diameter, stiffness gradient, and arrangement of biomimetic fibers are adjustable; S4, establishing a quadratic regression equation with the target curve as the optimization target to obtain optimal parameters with a matching degree ≥90%; S5, using multi-material additive manufacturing for integrated molding. This invention achieves individualized stiffness matching and biomimetic structure reproduction, improves fatigue and shear resistance, and is suitable for personalized customization of the lumbar spine.