Arterial pulse attenuation prediction using the decaying rate of a pressure wave in a viscoelastic material model

• Published in: Biomechanics and modeling in mechanobiology Vol. 17; no. 2; pp. 589 - 603
• Main Authors: Menacho, J., Rotllant, L., Molins, J. J., Reyes, G., García-Granada, A. A., Balcells, M., Martorell, J.
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01-04-2018; Springer Nature B.V
• Subjects: Arteries - physiology; Biological and Medical Physics; Biomedical Engineering and Bioengineering; Biophysics; Blood vessels; Computer Simulation; Decay rate; Dimethylpolysiloxanes - chemistry; Elastic waves; Elasticity; Energy absorption; Engineering; Mathematical models; Mechanical properties; Medical materials; Models, Biological; Moisture content; Numerical Analysis, Computer-Assisted; Original Paper; Polydimethylsiloxane; Polytetrafluoroethylene; Pressure; Propagation; Prostheses; Prosthetics; Pulse propagation; Reproducibility of Results; Space life sciences; Stiffness; Surgical implants; Theoretical and Applied Mechanics; Viscoelastic materials; Viscoelasticity; Viscosity; Wave attenuation; Wave propagation; Cardiovascular disease; Pressure wave damping; Circulatory system; Computational fluid dynamics
• ISSN: 1617-7959; 1617-7940
• DOI: 10.1007/s10237-017-0980-9

The present study examines the possibility of attenuating blood pulses by means of introducing prosthetic viscoelastic materials able to absorb energy and damp such pulses. Vascular prostheses made of polymeric materials modify the mechanical properties of blood vessels. The effect of these materials on the blood pulse propagation remains to be fully understood. Several materials for medical applications, such as medical polydimethylsiloxane or polytetrafluoroethylene, show viscoelastic behavior, modifying the original vessel stiffness and affecting the propagation of blood pulses. This study focuses on the propagation of pressure waves along a pipe with viscoelastic materials using the Maxwell and the Zener models. An expression of exponential decay has been obtained for the Maxwell material model and also for low viscous coefficient values in the Zener model. For relatively high values of the viscous term in the Zener model, the steepest part of the pulse can be damped quickly, leaving a smooth, slowly decaying wave. These mathematical models are critical to tailor those materials used in cardiovascular implants to the mechanical environment they are confronted with to repair or improve blood vessel function.