In vitro testing of surface thrombogenicity using the thrombelastograph

Area of Science:

• Biomaterials Science
• Hemostasis and Thrombosis Research
• Medical Device Engineering

Background:

• Assessing the thrombogenicity of synthetic biomaterials is crucial for medical device development.
• Existing methods for evaluating blood-surface interactions can lack accuracy and quantitative interpretation.
• The Thrombelastograph (TEG) is a viscoelastic monitoring device used in coagulation analysis.

Purpose of the Study:

• To develop and validate a novel protocol for the Thrombelastograph (TEG) instrument.
• To quantitatively assess the pro-coagulant or anti-coagulant properties of synthetic surfaces.
• To compare the thrombogenic potential of specific synthetic materials used in biomedical applications.

Main Methods:

• A new protocol was implemented on the Thrombelastograph instrument.
• Analysis focused on the hydrodynamic state of whole blood during coagulation within TEG chambers.
• Quantitative interpretation of TEG output was established based on hydrodynamic analysis.
• Thrombogenic properties of segmented polyurethane, polydimethyl siloxane, and reconstituted elastin were evaluated.

Main Results:

• The new TEG protocol provides improved accuracy in assessing synthetic surface thrombogenicity.
• Quantitative interpretation of TEG data was achieved through hydrodynamic analysis.
• Reconstituted elastin demonstrated a four-fold delay in blood clotting time compared to the tested synthetic polymers.
• Segmented polyurethane and polydimethyl siloxane exhibited different thrombogenic profiles relative to reconstituted elastin.

Conclusions:

• The developed Thrombelastograph protocol offers a more accurate method for evaluating biomaterial thrombogenicity.
• Hydrodynamic analysis enables quantitative assessment of blood-surface interactions on synthetic materials.
• Reconstituted elastin exhibits significantly lower thrombogenicity than common synthetic biomaterials like segmented polyurethane and polydimethyl siloxane.
• This study provides valuable data for selecting appropriate synthetic materials in biomedical device design to mitigate thrombotic risks.