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Related Experiment Videos

Phosphonated polyurethanes that resist calcification.

R R Joshi1, J R Frautschi, R E Phillips

  • 1Department of Pediatrics, University of Michigan, Ann Arbor.

Journal of Applied Biomaterials : an Official Journal of the Society for Biomaterials
|April 1, 1994
PubMed
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Researchers developed novel calcification-resistant polyetherurethanes (PEU) by covalently binding bisphosphonate (HEBP). This material showed excellent stability and reduced calcium diffusion, proving effective in preventing implant calcification in vivo without side effects.

Area of Science:

  • Biomaterials Science
  • Polymer Chemistry
  • Cardiovascular Engineering

Background:

  • Cardiovascular implant mineralization is a major cause of clinical failure for bioprosthetic heart valves and artificial heart devices.
  • Current synthetic materials like polyurethanes are susceptible to calcification, limiting their long-term efficacy.
  • There is a critical need for advanced materials that resist mineralization for improved implant performance.

Purpose of the Study:

  • To synthesize and characterize novel calcification-resistant polyetherurethanes (PEU) by covalently incorporating bisphosphonate (HEBP).
  • To evaluate the stability, material properties, and in vitro/in vivo performance of the derivatized PEU.
  • To assess the potential of HEBP-modified PEU as a candidate material for heart valve prostheses and other implantable devices.

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Main Methods:

  • Covalent binding of 2-hydroxyethane bisphosphonic acid (HEBP) to polyetherurethanes (PEU) via a proprietary reaction.
  • Stability assessment of HEBP binding through release kinetics studies in physiological buffer.
  • Surface and bulk material characterization using FTIR-ATR, ESCA, SEM/EDX, solubility, and GPC.
  • In vitro evaluation of calcium diffusion through derivatized PEU.
  • In vivo assessment of calcification resistance using rat subdermal implants for 60 days.

Main Results:

  • Covalent binding of HEBP was stable, efficient, and permanent, occurring in the soft segment of PEU without altering original material properties.
  • HEBP modification reduced surface degradation and decreased calcium permeation in a concentration-dependent manner.
  • In vivo implants of HEBP-modified PEU demonstrated significant calcification resistance without adverse side effects.

Conclusions:

  • Covalently bound HEBP in PEU provides a stable and effective method for achieving calcification resistance in biomaterials.
  • The developed HEBP-modified PEU exhibits promising properties for fabricating improved heart valve prostheses and other implantable medical devices.
  • This novel material offers a potential solution to the long-standing problem of mineralization in cardiovascular implants.