Double safety and effectiveness inspection method of human lumbar bone and implant

Abstract

The invention provides a double safety and effectiveness inspection method of human lumbar bone and implant, and belongs to the field of medicine. The method comprises the following steps: acquiring a 3D (three-dimensional) rendering model of lumbar body bone, lumbar disc and interspinous ligament by a 3D reconstruction technology; performing 3D grid division to the 3D rendering model, and giving attributes of a heterogeneous material to the 3D rendering model; performing 3D modeling to an implant; assembling the lumbar body bone, the lumbar disc, the interspinous ligament and the implant, and analyzing stress and strain of the assembly by adopting uniformly distributed nodal load through a finite element analysis method; simulating visible finite element analysis by a computer before the implant is implanted into a human body. Therefore, the verification requirement to bone and implant double safety and effectiveness can be fulfilled, the damage of the implant to original human lumbar bones can be prevented, double safety and effectiveness of the bones and implant can be guaranteed, the manufacture cost can be effectively reduced along with convenience and quickness, and individual and industrial manufacturing of a human lumbar bone implant can be realized. The method is applicable in the field of implant stress-strain analysis in the orthopedics department.

Description

technical field [0001] The invention belongs to the field of medicine, in particular to an implant used in orthopedics for human lumbar bones. Background technique [0002] The human spine is composed of vertebrae and lumbar intervertebral discs, and is the backbone of the body. The spine can be divided into five segments: cervical, thoracic, lumbar, sacrum, and coccyx. The shape of the spine can change considerably as the load on the body changes. The flexibility of the spine depends on the integrity of the lumbar intervertebral discs and the fit of the articular processes of the associated vertebrae. [0003] The functional unit of the spine, also known as a spinal motion segment, includes two vertebral bodies and the intervening facet joints, lumbar intervertebral discs, posterior structures of the spine, and spinal ligaments. Each vertebra interacts with its neighbors through three joints: the lumbar disc anteriorly, and the paired articular processes posteriorly. ...

AI Technical Summary

Problems solved by technology

This technical solution focuses on the modeling and stress and strain analysis of thoracic bones with regular structure, smooth surface and relatively uniform bone quality, and applies displacement constraints to the degrees of freedom of all surface nodes on the surface of each thoracic vertebra to make them immobilized. And the concentrated external force is applied to the thoracic vertebrae, and the obtained is a three-dimensional mechanical model of pectus pectus excavatum under static load (see paragraph [0039] on page 5 of the manual), so it is only applicable to the operation plan of pectus pectus excavatum. The comparison and determination of the incision position cannot analyze the biomechanical properties of the vertebral segment with irregular structure, rough surface, uneven bone quality, and soft tissue of the lumbar intervertebral disc, and cannot reflect the role of the interspinous ligament in the entire spinal segment. segment and influence on the force distribution results; it only considers the fit of the model between the rib, sternum and costal cartilage, and does not The problem of model assembly between cartilages, it is not possible to determine the impact of the implant on the original bone after the assembly of the bone, and there is no separate finite element analysis of the implant, and it is impossible to realize the functional unit of the spine (spine movement). Segment) and the mutual stress and strain analysis between the implant, which cannot meet the verification requirements of double safety and effectiveness between the spine bone and the implant

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