The adoption of a weighting process for fitting constitutive models of blood vessels permitted accurate prediction of contact pressures and forces using models with fewer parameters.
Weighted fitting procedures in constitutive anisotropic hyperelastic models improve the accuracy of predicting tissue-robot interactions in computational simulations of cardiovascular procedures.
Cardiovascular diseases are the leading cause of death in the western countries. Robotic surgery recently emerged as a confirmed strategy in the cardiovascular field, especially thanks to the improvement of soft robotics. These techniques have demonstrated their potential in terms of speed of execution and precision. In this context, a deeper knowledge of the material properties of the blood vessels is required, especially for computational soft robotics applications. A constitutive model including the contribution of the collagen fibers families is needed to take hyperelasticity and anisotropy into account. For this purpose, four different models are presented: two fiber families with dispersion (2FFD), two fiber families without dispersion (2FF), four fiber families with dispersion (4FFD), and four fiber families without dispersion (4FF). A set of experimental biaxial data obtained from ex-vivo specimens was used to assess the model performances. Two fitting procedures were imposed: a procedure with no weighting of scores and a procedure with a weight set to enhance the model performances in the contact range. A finite element simulation of a contact procedure was developed to evaluate the effect on the contact pressures and forces according to the different model implementations. In particular, a minimally invasive aortic valve positioning process through a previously designed soft robot was simulated. The results confirmed the overall fitting procedure. The adoption of the weighting process for the fitting was successful, as it permitted an accurate prediction in the region of interest through models with less parameters.
Vignali et al. (Tue,) conducted a other in Cardiovascular diseases. Constitutive anisotropic hyperelastic models with weighting process vs. Models without weighting process was evaluated on Model performances in predicting contact pressures and forces. The adoption of a weighting process for fitting constitutive models of blood vessels permitted accurate prediction of contact pressures and forces using models with fewer parameters.
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