Elasticity modulus determination method and preparation method of individualized limb bone fracture setting internal fixation device

Abstract

The invention discloses an elasticity modulus determination method and preparation method of an individualized limb bone fracture setting internal fixation device.The elasticity modulus determination method comprises the steps that CT scanning is performed on a target limb bone, a three-dimensional model is rebuilt, the material attributes are given to the target limb bone, a finite element analysis model is built, and an elasticity modulus gradient distribution rule is obtained through analysis; the internal fixation device is drawn according to the operation requirements, and the elasticity modulus of the internal fixation device is obtained by aiming at the assembly relationship between the fracture part of the limb bone and the internal fixation device, combining the elasticity modulus gradient distribution rule and adopting an interpolation method.According to the elasticity modulus determination method and preparation method of the individualized limb bone fracture setting internal fixation device, internal individualization and external individualization are both achieved, the internal fixation device is externally fit with the human body limb bone and internally good in matching with the biomechanical characteristic of the individual bone, stress distribution of a steel plate and screws is more uniform and more reasonable, the stress shielding effect of an internal fixation material on the bone can be reduced, the compressing force of a fracture interface can be increased, the fracture heating fixation requirement is better met, and a scientific basis can be supplied to following research and development of a novel material, optimized design of an operation method and operative instruments and building of a relative database.

Description

technical field [0001] The invention relates to orthopedic internal fixation implants, in particular to a method for determining the elastic modulus and preparing a personalized bone-synthetic internal fixation device for limbs that meets the biomechanical requirements of human limbs and bones. Background technique [0002] Fracture is a common disease in clinical medicine, and internal fixation is a method that often needs to be used, that is, using internal fixation implants such as steel plates and screws to directly perform surgical fixation on the broken end of the fracture. A good fracture internal fixation implant should meet the following conditions: ① good biocompatibility; ② high enough strength and stable fixation; ③ as few complications as possible and can promote fracture healing, that is, it is required to It not only requires reliable fixation, but also reduces the shear stress and stress shielding of the fracture end, which is conducive to early functional ex...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention: aiming at the technical problems that the above-mentioned internal fixation implants in the prior art do not fit well with the bones of the limbs of the human body, and the elastic modulus does not match, to provide an internally and externally personalized implant that is compatible with the bones of the limbs of the human body. It fits well with the biomechanical properties of individual bones. The stress distribution of steel plates and screws is more uniform and reasonable, which can reduce the stress shielding effect of internal fixation materials on bones and improve the compression force of fracture interface, which is more in line with the fixation requirements of fracture healing. Determination of the elastic modulus and preparation method of the personalized limb bone bone internal fixation device that can provide scientific basis for the next step of research and development of new materials, optimization design of surgical methods and surgical instruments, and establishment of relevant databases

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