Intervertebral movable indwelling device

Abstract

The invention relates to an intervertebral movable indwelling device, comprising an upper bone plate and a lower bone plate. A spherical friction pair consisting of a liner and a vertebral core is embedded between the upper bone plate and the lower bone plate; the upper bone plate recesses inwards to form an embedding groove, and the liner is provided with a stop member embedded in the embedding groove; the liner keeps static or rotates or shifts horizontally relative to the upper bone plate, the vertebral core keeps static or rotates or shifts horizontally relative to the lower bone plate, and the rotation center of the spherical friction pair formed of the liner and the vertebral core is free of axial displacement or can move freely along the front, back, left and right directions. According to the design scheme of separating a socket structure from the bone plate structure, the socket structure is arranged in the liner member and is directly connected with the upper bone in a nesting manner, and the vertebral core and the lower bone plate also form a nesting structure, so that the complete intervertebral movable indwelling device is formed, and it is possible to realize the application of the nonmetallic-nonmetallic friction pair of different types of materials with excellent performance to the intervertebral movable indwelling device.

Description

Technical field [0001] The invention relates to the technical field of structural design and application of orthopedic medical supplies, in particular to an intervertebral motion retention device. Background technique [0002] As a representative of non-fusion surgery products, the intervertebral motion retention device has a broad market prospect. There is currently no self-developed artificial intervertebral motion retention device that has been approved by the CFDA, and the domestic intervertebral motion retention devices are in the patent protection stage. Most of the patents that have been authorized and applied for are part of the structural shape or material changes based on the products that have been applied abroad. The relative motion between product components and the connection and fixing methods between product components have not undergone major changes. Or significant structural innovation. [0003] Traditional intervertebral motion retention devices usually adopt a...

AI Technical Summary

Problems solved by technology

The second technical problem to be solved by the present invention is to provide a design that adopts the separation of the socket structure and the bone plate structure. The nesting structure of the nucleus pulposus and the lower bone plate is used together to form a complete intervertebral motion preservation device, which makes non-metal-non-metal (polyetheretherketone-UHMWPE) friction pairs of different materials with excellent performance in the intervertebral The application of motion preservation devices becomes possible, avoiding the poor wear resistance of the products caused by the friction pair of the same metal or non-metal material of the traditional intervertebral motion retention device products, and the friction pair formed by metal and non-metal is prone to non-metal wear debris, leading to complications such as osteolysis, implant laxity, and prosthetic failure

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