Nonlinear dynamics of dacron aortic prostheses conveying pulsatile flow

Eleonora Tubaldi, Michael P. Païdoussis, Marco Amabili

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

This study addresses the dynamic response to pulsatile physiological blood flow and pressure of a woven Dacron graft currently used in thoracic aortic surgery. The model of the prosthesis assumes a cylindrical orthotropic shell described by means of nonlinear Novozhilov shell theory. The blood flow is modeled as Newtonian pulsatile flow, and unsteady viscous effects are included. Coupled fluid-structure Lagrange equations for open systems with wave propagation subject to pulsatile flow are applied. Physiological waveforms of blood pressure and velocity are approximated with the first eight harmonics of the corresponding Fourier series. Time responses of the prosthetic wall radial displacement are considered for two physiological conditions: at rest (60 bpm) and at high heart rate (180 bpm). While the response at 60 bpm reproduces the behavior of the pulsatile pressure, higher harmonics frequency contributions are observed at 180 bpm altering the shape of the time response. Frequency-responses show resonance peaks for heart rates between 130 bpm and 200 bpm due to higher harmonics of the pulsatile flow excitation. These resonant peaks correspond to unwanted high-frequency radial oscillations of the vessel wall that can compromise the long-term functioning of the prosthesis in case of significant physical activity. Thanks to this study, the dynamic response of Dacron prostheses to pulsatile flow can be understood as well as some possible complications in case of significant physical activity.

Original languageEnglish (US)
Article number061004
JournalJournal of Biomechanical Engineering
Volume140
Issue number6
DOIs
StatePublished - Jun 1 2018
Externally publishedYes

Fingerprint

Pulsatile Flow
Pulsatile flow
Polyethylene Terephthalates
Nonlinear Dynamics
Conveying
Prosthetics
Prostheses and Implants
Dynamic response
Blood
Heart Rate
Blood Pressure
Open systems
Blood pressure
Fourier series
Fourier Analysis
Grafts
Surgery
Wave propagation
Thoracic Surgery
Frequency response

ASJC Scopus subject areas

  • Biomedical Engineering
  • Physiology (medical)

Cite this

Nonlinear dynamics of dacron aortic prostheses conveying pulsatile flow. / Tubaldi, Eleonora; Païdoussis, Michael P.; Amabili, Marco.

In: Journal of Biomechanical Engineering, Vol. 140, No. 6, 061004, 01.06.2018.

Research output: Contribution to journalArticle

@article{42049091cfe94e348d607914bf3fe982,
title = "Nonlinear dynamics of dacron aortic prostheses conveying pulsatile flow",
abstract = "This study addresses the dynamic response to pulsatile physiological blood flow and pressure of a woven Dacron graft currently used in thoracic aortic surgery. The model of the prosthesis assumes a cylindrical orthotropic shell described by means of nonlinear Novozhilov shell theory. The blood flow is modeled as Newtonian pulsatile flow, and unsteady viscous effects are included. Coupled fluid-structure Lagrange equations for open systems with wave propagation subject to pulsatile flow are applied. Physiological waveforms of blood pressure and velocity are approximated with the first eight harmonics of the corresponding Fourier series. Time responses of the prosthetic wall radial displacement are considered for two physiological conditions: at rest (60 bpm) and at high heart rate (180 bpm). While the response at 60 bpm reproduces the behavior of the pulsatile pressure, higher harmonics frequency contributions are observed at 180 bpm altering the shape of the time response. Frequency-responses show resonance peaks for heart rates between 130 bpm and 200 bpm due to higher harmonics of the pulsatile flow excitation. These resonant peaks correspond to unwanted high-frequency radial oscillations of the vessel wall that can compromise the long-term functioning of the prosthesis in case of significant physical activity. Thanks to this study, the dynamic response of Dacron prostheses to pulsatile flow can be understood as well as some possible complications in case of significant physical activity.",
author = "Eleonora Tubaldi and Pa{\"i}doussis, {Michael P.} and Marco Amabili",
year = "2018",
month = "6",
day = "1",
doi = "10.1115/1.4039284",
language = "English (US)",
volume = "140",
journal = "Journal of Biomechanical Engineering",
issn = "0148-0731",
publisher = "American Society of Mechanical Engineers(ASME)",
number = "6",

}

TY - JOUR

T1 - Nonlinear dynamics of dacron aortic prostheses conveying pulsatile flow

AU - Tubaldi, Eleonora

AU - Païdoussis, Michael P.

AU - Amabili, Marco

PY - 2018/6/1

Y1 - 2018/6/1

N2 - This study addresses the dynamic response to pulsatile physiological blood flow and pressure of a woven Dacron graft currently used in thoracic aortic surgery. The model of the prosthesis assumes a cylindrical orthotropic shell described by means of nonlinear Novozhilov shell theory. The blood flow is modeled as Newtonian pulsatile flow, and unsteady viscous effects are included. Coupled fluid-structure Lagrange equations for open systems with wave propagation subject to pulsatile flow are applied. Physiological waveforms of blood pressure and velocity are approximated with the first eight harmonics of the corresponding Fourier series. Time responses of the prosthetic wall radial displacement are considered for two physiological conditions: at rest (60 bpm) and at high heart rate (180 bpm). While the response at 60 bpm reproduces the behavior of the pulsatile pressure, higher harmonics frequency contributions are observed at 180 bpm altering the shape of the time response. Frequency-responses show resonance peaks for heart rates between 130 bpm and 200 bpm due to higher harmonics of the pulsatile flow excitation. These resonant peaks correspond to unwanted high-frequency radial oscillations of the vessel wall that can compromise the long-term functioning of the prosthesis in case of significant physical activity. Thanks to this study, the dynamic response of Dacron prostheses to pulsatile flow can be understood as well as some possible complications in case of significant physical activity.

AB - This study addresses the dynamic response to pulsatile physiological blood flow and pressure of a woven Dacron graft currently used in thoracic aortic surgery. The model of the prosthesis assumes a cylindrical orthotropic shell described by means of nonlinear Novozhilov shell theory. The blood flow is modeled as Newtonian pulsatile flow, and unsteady viscous effects are included. Coupled fluid-structure Lagrange equations for open systems with wave propagation subject to pulsatile flow are applied. Physiological waveforms of blood pressure and velocity are approximated with the first eight harmonics of the corresponding Fourier series. Time responses of the prosthetic wall radial displacement are considered for two physiological conditions: at rest (60 bpm) and at high heart rate (180 bpm). While the response at 60 bpm reproduces the behavior of the pulsatile pressure, higher harmonics frequency contributions are observed at 180 bpm altering the shape of the time response. Frequency-responses show resonance peaks for heart rates between 130 bpm and 200 bpm due to higher harmonics of the pulsatile flow excitation. These resonant peaks correspond to unwanted high-frequency radial oscillations of the vessel wall that can compromise the long-term functioning of the prosthesis in case of significant physical activity. Thanks to this study, the dynamic response of Dacron prostheses to pulsatile flow can be understood as well as some possible complications in case of significant physical activity.

UR - http://www.scopus.com/inward/record.url?scp=85044528695&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85044528695&partnerID=8YFLogxK

U2 - 10.1115/1.4039284

DO - 10.1115/1.4039284

M3 - Article

C2 - 29423504

AN - SCOPUS:85044528695

VL - 140

JO - Journal of Biomechanical Engineering

JF - Journal of Biomechanical Engineering

SN - 0148-0731

IS - 6

M1 - 061004

ER -