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Related Experiment Videos

Bisphosphonate derivatized polyurethanes resist calcification.

I Alferiev1, N Vyavahare, C Song

  • 1Division of Cardiology, The Children's Hospital of Philadelphia, PA 19104, USA.

Biomaterials
|August 25, 2001
PubMed
Summary
This summary is machine-generated.

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Bisphosphonate-modified polyurethanes resist calcification in cardiovascular implants. This novel biomaterial prevents device failure, offering promise for long-term blood-contact applications.

Area of Science:

  • Biomaterials Science
  • Polymer Chemistry
  • Cardiovascular Engineering

Background:

  • Calcification compromises polyurethane cardiovascular implants like heart valves and ventricular assist devices.
  • Developing materials to resist calcification is crucial for long-term implant function.

Purpose of the Study:

  • To formulate and characterize bisphosphonate-derivatized polyurethanes to resist implant calcification.
  • To evaluate the efficacy of immobilized bisphosphonates in preventing calcification in vivo.

Main Methods:

  • Polyurethanes were modified post-polymerization via bromoalkylation followed by bisphosphonate attachment.
  • Bisphosphonate-polyurethanes were tested in rat subdermal implants (60 days) and sheep pulmonary valve cusp replacements (90 days).

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Main Results:

  • Bisphosphonate-modified polyurethanes showed resistance to calcification in rat subdermal implants compared to controls.
  • In sheep pulmonary valve replacements, bisphosphonate-modified polyurethane cusps did not calcify, unlike control implants with calcific deposits.

Conclusions:

  • Bisphosphonate modification effectively prevents calcification in polyurethanes for both subdermal and circulatory implants.
  • This biomaterial strategy holds significant potential for developing calcification-resistant blood-contacting medical devices.