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Related Experiment Videos

Viscoelastic behavior of polyurethane vascular prostheses.

T V How1, D Annis

  • 1Institute of Medical and Dental Bioengineering, University of Liverpool, United Kingdom.

Journal of Biomedical Materials Research
|September 1, 1987
PubMed
Summary

This study evaluates the viscoelastic properties of Biomer vascular grafts using quasi-static and dynamic tests. Biomer grafts exhibit higher viscosity than canine arteries, particularly at high frequencies.

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Area of Science:

  • Biomaterials Science
  • Biomedical Engineering
  • Materials Science

Background:

  • Vascular prostheses are crucial for cardiovascular repair.
  • Understanding the viscoelastic properties of synthetic grafts like Biomer is essential for predicting their in vivo performance.
  • Existing research often lacks detailed analysis of Biomer's dynamic mechanical behavior.

Purpose of the Study:

  • To outline a method for evaluating the in vitro viscoelastic properties of microfibrous Biomer poly(ether-urethane-urea) vascular prostheses.
  • To compare the viscoelastic behavior of Biomer grafts with native canine arteries.
  • To investigate the influence of frequency, strain, and temperature on graft compliance and moduli.

Main Methods:

  • Performed quasi-static and dynamic mechanical tests on Biomer vascular grafts.

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  • Measured graft dimensions (diameter, wall thickness) and applied transmural pressure.
  • Calculated quasi-static compliance, dynamic compliance spectra, dynamic elastic, and viscous moduli as functions of frequency, strain, and temperature.

    • Main Results:

    • Developed an equation to determine quasi-static compliance from graft dimensions and material constants.
    • Found the ratio of dynamic to quasi-static compliance linearly related to log frequency, independent of strain and temperature within studied ranges.
    • Biomer grafts demonstrated higher viscosity than canine carotid and femoral arteries, especially at higher frequencies.

    Conclusions:

    • The developed method effectively characterizes Biomer graft viscoelasticity in vitro.
    • Biomer grafts exhibit distinct viscoelastic properties compared to natural arteries, with increased viscosity.
    • The frequency-dependent behavior of Biomer grafts shows similarities to native femoral arteries, suggesting potential for mechanical compatibility analysis.