Objective Based on the bidirectional fluid-structure coupling model of the intermittent pneumatic compression device acting on lower extremities established by the research group at the early stage,the study adopts viscoelastic properties for human tissues to better conform to human biomechanical characteristics.Methods The bidirectional fluid-structure coupling model of the intermittent pneumatic compression device acting on lower extremities was constructed with Ansys Workbench.In the simulation model,fat,muscles and venous walls were endowed with viscoelastic properties,and the change of lower extremity venous blood volume during inflation-holding-deflation operation of the intermittent pneumatic compression device was obtained.A self-developed intermittent pneumatic compression device was used to apply the same working conditions as in the simulation to the calf of the healthy subject,and the blood volume of the great saphenous vein was monitored using an infrared detection sensor based on photoplethysmography.Results The simulation and measurement results were consistent.With the intermittent pneumatic compression device acting on lower extremities,the blood volume in the lower extremity veins decreased in the inflation stage,and blood was discharged;in the holding stage,the blood volume also decreased;in the deflation stage,the blood volume increased,and the veins were refilled with blood,with the refilling time longer than the deflation duration.Conclusion The change of blood volume measured with the infrared detection sensor is consistent with the simulation results,verifying the accuracy and reliability of the proposed model of viscoelastic materials.
维普
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