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Utility of FEM and FEA. Evaluate possible designs without manufacturing a prototype Augment experimental capabilities time money. Heart Disease. 4 million patients in the U.S. are victims of heart failure, and nearly 400,000 new cases are diagnosed each year 2,800 receive heart transplants

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utility of fem and fea
Utility of FEM and FEA
  • Evaluate possible designs without manufacturing a prototype
  • Augment experimental capabilities
    • time
    • money
heart disease
Heart Disease
  • 4 million patients in the U.S. are victims of heart failure, and nearly 400,000 new cases are diagnosed each year
  • 2,800 receive heart transplants
  • Heart disease is the leading cause of death and disability in the U.S.
arrow lionhearttm
Arrow LionHeartTM
  • LVAD (Left Ventricular Assist Device)
    • electric pulsatile blood pump
    • fully implanted in upper abdomen
    • 70 cc volume

8 L/min at beat rate of 135 =

stroke volume of 60 cc

introduction
Introduction

Poly(urethaneurea)

Blood Sac

Pusher-

plate

Titanium

Pump Case

introduction5
Introduction
  • Design goal: 2 yrs @50,000,000 cycles/yr = 100,000,000 cycles
  • FEA used to evaluate various pump designs and their effectiveness at reducing the material stresses
finite element model
Finite Element Model
  • Axisymmetric
  • Pusherplate and pump case treated as rigid
  • 8-node continuum elements
  • Blood sac : homogeneous,

hyperelastic (non-linear)

  • Frictionless contact
boundary conditions
Boundary Conditions
  • Internal pressure = 100 mm Hg
  • Rigid pump case was fixed in space
  • Pusherplate displaced 0.8 inches
    • 30 increments
    • simulating ejection stroke of pump
parametric study
Parametric Study
  • 3 different thickness sacs (0.015, 0.02, 0.025 inches)
  • 2 pump case designs (tapered, not tapered)
  • 2 radii of curvature for sac (3/16 and 7/16 inch)
  • Total of 12 cases
slide10

3/16 inch of stroke

3/8 inch of stroke

end of stroke

slide11

2

3

4

1

conclusions
Conclusions
  • Material stresses and strains are sensitive to the thickness of the blood sac
  • Radius of curvature has little influence on the peak stress in the blood sac, however, it does affect when the peak stress occurs during the stroke cycle
conclusions15
Conclusions
  • Tapering the pump case can significantly alter blood sac stresses
  • All stresses and strains were much lower than the yield stress and strain for poly (urethaneurea)
news release feb 28th 2001
News Release (Feb. 28th, 2001)
  • First fully implantable heart assist device implanted
  • As of March 12th, Arrow LionHeartTM recipient is stable and recovering as expected
total artificial heart
Total Artificial Heart
  • Fit into chest cavity
    • 50 cc
  • Develop a model to predict and minimize stresses in biomaterials, so that the durability of a reduced-size device is not adversely affected by pump scaling
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