ABSTRACT
Objective To analyze the differences in mechanical properties of arterial vessels at different sites and the effects of different test methods on the experimental results. Methods A unique fixtures based on characteristics of artery shape was designed. The porcine thoracic aorta and common carotid arteries were applied with uniaxial tensile tests under 4 different states (tubular vessels in axial and radial direction and sheets in axial and circumferential direction), and data fitting analysis was conducted on their nonlinearity. Results The mechanical properties of aorta vessels under tubular state were stronger than those under sheet state, and the difference in such numerical results became more significant with the diameter of the tube decreasing. Conclusions The experiment results, provide more comprehensive and reliable vascular mechanical parameters to provide data support for constructing finite element model and constitutive relationship of blood vessels, and guide design and manufacture of tissue engineered vascular grafts. At the same time, it is also beneficial to study and analyze the potential pathophysiology of certain vascular diseases, which will help doctors to present better therapeutic effects in clinical treatment.
ABSTRACT
Objective To analyze the differences in mechanical properties of arterial vessels at different sites and the effects of different test methods on the experimental results. Methods A unique fixtures based on characteristics of artery shape was designed. The porcine thoracic aorta and common carotid arteries were applied with uniaxial tensile tests under 4 different states (tubular vessels in axial and radial direction and sheets in axial and circumferential direction), and data fitting analysis was conducted on their nonlinearity. Results The mechanical properties of aorta vessels under tubular state were stronger than those under sheet state, and the difference in such numerical results became more significant with the diameter of the tube decreasing. Conclusions The experiment results, provide more comprehensive and reliable vascular mechanical parameters to provide data support for constructing finite element model and constitutive relationship of blood vessels, and guide design and manufacture of tissue engineered vascular grafts. At the same time, it is also beneficial to study and analyze the potential pathophysiology of certain vascular diseases, which will help doctors to present better therapeutic effects in clinical treatment.
ABSTRACT
Objective: To research the correlation between compositions and absorption of the multi-components in Coptidis Rhizoma and to explore the methods suitable for identifying the interactions of multi-components in Coptidis Rhizoma during the absorption process. Methods: Samples of various compositions by their different combinations of each component in Coptidis Rhizoma were designed and prepared using Caco-2 monolayer model. Using HPLC method for the simultaneous quantitative determination, taking the inherent apparent permeability coefficients (Papp) by the individual transport of each component as reference, the least square multi-linear regression was used for data fitting to obtain the correlation between interaction intensity of Papp and concentration of each component by their different combinations and to analyze the interaction type and intensity of multi-components during the absorption. Results: The quantitative relationship of multi-component interactions for coptisine, jatrorrhizine, berberine, and palmatine was obtained, respectively. The main contributors for the multi-component interaction, including single component and interactive products of the different components, were also identified. The quantitative relationship affecting the absorption was also obtained. Conclusion: A well-designed method for studying the multi-component interactions of Coptidis Rhizoma using mathematical method is practicable.