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Related Experiment Videos

Delrin as an occluder material.

S H Teoh1, R L Martin, S C Lim

  • 1Mechanical and Production Engineering Department, National University of Singapore.

ASAIO Transactions
|July 1, 1990
PubMed
Summary
This summary is machine-generated.

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Delrin (DR) offers a safer, more affordable alternative to Pyrolytic Carbon (PC) for cardiac valves. Improved design enhances DR durability, making it a superior choice over PC, which shows signs of fracture.

Area of Science:

  • Biomaterials Science
  • Mechanical Engineering
  • Cardiovascular Research

Background:

  • Delrin (DR) has a long history in biomedical applications but was replaced by Pyrolytic Carbon (PC) in cardiac valves due to durability concerns.
  • Recent failures of PC in mechanical heart valves necessitate a re-evaluation of materials, including DR.

Purpose of the Study:

  • To critically compare the wear and durability of Delrin (DR) and Pyrolytic Carbon (PC) in St. Vincents Mechanical (SVM) heart valves.
  • To assess the suitability of DR as a safer and more cost-effective occluder material for cardiac valves.

Main Methods:

  • Accelerated life cycle testing of three SVM-DR and three SVM-PC valves up to 400 million cycles.
  • Wear analysis of tested valves and comparison with in vivo data from Björk-Shiley Delrin (BS-DR) valves.

Related Experiment Videos

  • Calculation of wear rates using a linear (wear depth)-log (cycles) plot.

    • Main Results:

    • Wear rates for DR and PC in SVM valves were found to be comparable.
    • SVM-DR valves exhibited a twofold reduction in wear rate compared to BS-DR valves, attributed to lower contact stresses.
    • Pyrolytic Carbon (PC) discs showed evidence of edge chipping and hairline cracks.

    Conclusions:

    • The durability of Delrin (DR) can be significantly improved through optimized valve design.
    • Delrin (DR) is more impact-resistant than Pyrolytic Carbon (PC).
    • Delrin (DR) presents a safer, more economical occluder material for cardiac valves compared to Pyrolytic Carbon (PC).