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Enhancing anti-thrombogenicity of biodegradable polyurethanes through drug molecule incorporation


Sufficient and sustained anti-thrombogenicity is essential for blood-contacting materials, because blood coagulation and thrombosis caused by platelet adhesion and activation on material surfaces may lead to functional failure and even fatal outcomes. Covalently conjugating anti-thrombogenic moieties into polymer, instead of surface modifying or blending, can maintain the anti-thrombogenicity of polymer at a high level over a time range. In this study, series of randomly crosslinked, elastic, biodegradable polyurethanes (PU-DPA) were synthesized through a one-pot and one-step method from polycaprolactone (PCL) diol, hexamethylene diisocyanate (HDI) and anti-thrombogenic drug, dipyridamole (DPA). The mechanical properties, hydrophilicity, in vitro degradation, and anti-thrombogenicity of the resultant PU-DPA polymers can be tuned by altering the incorporated DPA amount. The surface and bulk hydrophilicity of the polyurethanes decreased with increasing hydrophobic DPA amount. All PU-DPA polymers exhibited strong mechanical properties and good elasticity. The degradation rates of the PU-DPAs decreased with increasing DPA content in both PBS and lipase/PBS solutions. Covalently incorporating DPA into the polyurethane significantly reduced the platelet adhesion and activation compared to the polyurethane without DPA, and also can achieve sustained anti-thrombogenicity. The PU-DPA films also supported the growth of human umbilical vein endothelial cells. The attractive mechanical properties, blood compatibility, and cell compatibility of this anti-thrombogenic biodegradable polyurethane indicate that it has a great potential to be utilized for blood-contacting devices, and cardiovascular tissue repair and regeneration.

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Publication details

The article was received on 16 Jun 2018, accepted on 07 Aug 2018 and first published on 07 Aug 2018

Article type: Paper
DOI: 10.1039/C8TB01582A
Citation: J. Mater. Chem. B, 2018, Accepted Manuscript
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    Enhancing anti-thrombogenicity of biodegradable polyurethanes through drug molecule incorporation

    C. Xu, A. E. Kuriakose, D. Truong, P. Punnakitikashem, K. T. Nguyen and Y. Hong, J. Mater. Chem. B, 2018, Accepted Manuscript , DOI: 10.1039/C8TB01582A

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