Finite element analysis of stresses developed in the blood sac of a left ventricular assist device

T. L. Haut Donahue, W. Dehlin, J. Gillespie, William Weiss, Gerson Rosenberg

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The goal of this research is to develop a 3D finite element (FE) model of a left ventricular assist device (LVAD) to predict stresses in the blood sac. The hyperelastic stress-strain curves for the segmented poly(ether polyurethane urea) (SPEUU) blood sac were determined in both tension and compression using a servo-hydraulic testing system at various strain rates. Over the range of strain rates studied, the sac was not strain rate sensitive, however the material response was different for tension versus compression. The experimental tension and compression properties were used in a FE model that consisted of the pusher plate, blood sac and pump case. A quasi-static analysis was used to allow for nonlinearities due to contact and material deformation. The 3D FE model showed that blood sac stresses are not adversely affected by the location of the inlet and outlet ports of the device and that over the systolic ejection phase of the simulation the prediction of blood sac stresses from the full 3D model and an axisymmetric model are the same. Minimizing stresses in the blood sac will increase the longevity of the blood sac in vivo.

Original languageEnglish (US)
Pages (from-to)454-460
Number of pages7
JournalMedical Engineering and Physics
Volume31
Issue number4
DOIs
StatePublished - May 1 2009

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Left ventricular assist devices
Finite Element Analysis
Heart-Assist Devices
Blood
Finite element method
Strain rate
Polyurethanes
Static analysis
Stress-strain curves
Urea
Ether
Ethers
Compaction
Hydraulics
Pumps
Equipment and Supplies
Testing

All Science Journal Classification (ASJC) codes

  • Biophysics
  • Biomedical Engineering

Cite this

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Finite element analysis of stresses developed in the blood sac of a left ventricular assist device. / Haut Donahue, T. L.; Dehlin, W.; Gillespie, J.; Weiss, William; Rosenberg, Gerson.

In: Medical Engineering and Physics, Vol. 31, No. 4, 01.05.2009, p. 454-460.

Research output: Contribution to journalArticle

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