Abstract
In this study, the complete 3D wrist multi-physics finite element model (FEM) model was built to predict the vibration of radial artery and the BP, diastolic blood pressures (DBP) and systolic blood pressures (SBP). This model includes physics from several different fields including fluid mechanics, structural mechanics, electric currents and electric circuit coupled. In this study, a novel simulation method was used in non-invasive, cuffless BP sensor via a 3D fluid-solid-electric FEM which includes sensor of gel capsule and strain-sensing electrodes, radial artery, blood, radius bones, tendon, muscles and the front-end readout circuit. The experiment was established to validate the results with 3D wrist FEM model. As experiment and simulation results, the errors of strain variation are under 10 percent and around 30 percent by using fluid-solid-electric FEM and fluid-solid FEM, respectively. A novel simulation method in non-invasive, cuffless BP sensor was successfully developed via a 3D fluid-solid-electric FEM. The simulation results of strain variation are close to the experiments results, thus the 3D fluid-solid-electric FEM model in this study was effective and superior. A new 3D fluid-solid- electric coupling interaction finite element model of the wrist is built for predicting the vibration of radial artery and then diastolic and systolic blood pressures.
