3D printing of TPU airway stent and finite element simulation analysis and its mechanical properties
The compressibility of airway stent directly affects surgical operation,and the interaction force between the implant-ed stent and the airway has a significant impact on clinical efficacy.Simulation analysis on mechanical performance after stent implantation in the airway can provide reference for product development and clinical application.3D models of airway stents were constructed by using computer software,and airway stents with different extrusion rates and wall thicknesses were fabricated with thermoplastic elastomers as printing material by melt deposition 3D printing.The support force,compressive strength,and compres-sive modulus were tested by using a universal testing machine,and the stress situation in the simplified model of airway stenosis after stent implantation was analyzed through finite element simulation.As the radial compression ratio increases,the compression strength and radial support force of the stents show an upward trend,while the compression modulus shows a downward trend.As the printing extrusion rate increases,the silk material in the stent is stacked more tightly,and the compressive modulus,compressive strength,and radial support force all show an upward trend.The result of finite element simulation analysis shows that as the wall thickness increases,the deformation of the stent becomes difficult,and the generated support force becomes greater.As the stenosis rate increases,the compressive force on the stent increases,and stress concentration is closely related to the deformation ability of stent and the condition of airway stenosis.
3D printingTPU airway stentmechanical propertyfinite element simulationairway stenosis
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