Hyaluronan enhancement of expanded polytetrafluoroethylene cardiovascular grafts

Area of Science:

• Biomaterials Science
• Cardiovascular Engineering
• Surface Chemistry

Background:

• Heart disease remains a leading cause of mortality, driving demand for cardiovascular bypass procedures.
• Expanded polytetrafluoroethylene (ePTFE) grafts are widely used but suffer from thrombogenicity and poor patency, especially in small diameters.
• Hyaluronan, a natural polysaccharide, possesses beneficial anticoagulant and wound-healing properties.

Purpose of the Study:

• To evaluate the efficacy of hyaluronan treatment on the luminal surface of ePTFE grafts.
• To assess improvements in hemocompatibility and assess changes in mechanical and cytotoxic properties.

Main Methods:

• Surface modification of ePTFE grafts with hyaluronan.
• Surface characterization using ATR-FTIR and contact angle goniometry.
• Mechanical testing (tensile properties) and hemocompatibility assays (blood clotting, platelet activation).

Main Results:

• Hyaluronan treatment successfully altered surface chemistry, increasing hydrophilicity without affecting mechanical properties.
• Flow loop studies confirmed the durability of hyaluronan coating on the ePTFE inner lumen.
• Hemocompatibility tests demonstrated reduced blood clotting and platelet activation on treated grafts.

Conclusions:

• Hyaluronan-enhanced ePTFE exhibits improved hemocompatibility, reduced thrombogenicity, and maintained mechanical integrity.
• The hyaluronan coating is durable under physiological flow conditions.
• Hyaluronan-treated ePTFE represents a promising material for next-generation cardiovascular grafts.