Laminated plate theory-based optimization design method for composite bone fracture plate

Abstract

The invention discloses a laminated plate theory-based optimization design method for a composite bone fracture plate. The method specifically comprises the steps of selecting a material of the composite bone fracture plate, performing preliminary structure design on the material, and performing optimization design on a laying layer number, a laying sequence, a laying layer direction and the like of a laminated plate; solving axial rigidity, bending rigidity and torsional rigidity based on writing codes of a symmetric laminated plate theory for a structure meeting the condition; reasonably selecting a bending rigidity value, dividing the structure into a plurality of intervals, and calculating rigidity coefficient values; reserving a plurality of structures with maximum rigidity coefficients and applying the structures to a fracture healing simulation model for performing finite element analysis; and selecting out an optimal design scheme. According to the method, the composite bone fracture plate is subjected to comprehensive optimization design, and a stress shielding phenomenon during fracture fixation is skillfully utilized, so that the axial rigidity is reduced, the bending and torsional rigidity of the bone fracture plate is maximized, and the negative influence of stress shielding on fracture healing is reduced.

Description

technical field [0001] The invention belongs to the technical field of optimization of composite material fixers, and in particular relates to a composite material bone plate optimization design method based on laminated plate theory. Background technique [0002] Internal fixation with bone plate is one of the common methods in orthopedic treatment of fractures. After plate fixation of the fracture site, the degree of mobility of the fracture site depends on the magnitude of the external load, the stiffness of the fixation system, and the stiffness of the bridging tissues between the fractures. Traditional bone plates are mostly made of metal materials, which have the following disadvantages: [0003] (1) The difference between the elastic modulus and the bone is too large, and there is a stress shielding effect. [0004] (2) It has poor corrosion resistance and fatigue resistance, and is prone to failure. [0005] (3) The contact area with the bone is large and the bloo...

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Problems solved by technology

[0003] (1) The difference between the elastic modulus and the bone is too large, and there is a stress shielding effect

[0004] (2) Its corrosion resistance and fatigue resistance are poor, and it is prone to failure

[0005] (3) Large contact area with bone, destroying the blood supply of cortical bone

[0006] (4) Cause fracture malunion, nonunion, and re-fracture after fracture, which is not conducive to fracture healing

[0007] (5) Insufficient compatibility with human tissue

[0008] (6) Does not have physical and mechanical properties compatible with natural tissue

[0010] Augat et al. found that reducing the stiffness of the fixation plate can beneficially increase the load level at the fracture site and stimulate the remodeling of callus tissue, but may also lead to an increase in factors that are not conducive to fretting of the stump (such as shear and torsion). Destabilization of fractured ends

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